In the bustling construction landscapes of China, tower cranes stand as towering giants, pivotal in the erection of high-rise buildings, industrial complexes, and other monumental structures. Understanding the anatomy of these cranes is crucial for ensuring safety, efficiency, and reliability in construction projects. This in-depth guide delves into the intricate components and mechanisms of tower cranes, from the robust mast sections that provide stability and height, to the sophisticated jib sections that extend the crane’s reach, and the advanced hydraulic and slewing systems that enable precise and powerful operations.

Readers can expect to gain a comprehensive insight into the design, functionality, and maintenance of tower cranes. You will learn about the interchangeable mast sections, the importance of advanced welding techniques, and the role of safety devices such as anti-collision systems and load limiters. Additionally, this guide will explore the latest innovations in tower crane technology, including self-elevating mechanisms and advanced monitoring systems, all of which contribute to the smooth and efficient execution

Tower Crane Steel Structure Parts Jib Section

Tower Crane Jib Section: A Comprehensive Guide

Introduction to Tower Crane Jib

The Tower Crane Jib is a critical component of a tower crane, designed as a metal lattice structure, typically with a triangular section. Its primary function is to provide the crane with the necessary radius or range to perform various construction tasks.

Key Characteristics of Tower Crane Jib

Structure and Design

• The jib is a metal lattice structure, usually with a triangular section, which extends horizontally from the crane.
• It is designed to support a rolling trolley that runs along the underside of the jib, allowing for the horizontal movement of goods[1].

Materials

• The jib sections are made from high-quality Q345B steel, known for its strength and durability[1][2].

Connection Methods

• The jib sections are connected using either bolt or pin type connections, ensuring robust and secure assembly[2].

Product Information

Customization

• BQ Cranes can manufacture tower crane jib sections based on the specific drawings provided by clients, catering to various types of tower cranes[1].

Installation

• The jib sections are delivered in an assembled state, simplifying the installation process on site[1].

Packaging and Transportation

• The jib sections are packaged nude in containers for transportation.
• Transportation is primarily via ocean, with ports in Dalian and Qingdao available for shipment[1].

Applicable Industry and Usage

Construction Works

• Tower crane jib sections are predominantly used in construction works, providing the necessary reach and versatility for lifting and moving materials around the construction site[1].

Warranty and Support

Warranty Period

• The tower crane jib sections come with a 1-year warranty period, including a 1-year warranty for core components[1].

Out-of-Warranty Service

• Online support is available for out-of-warranty services, ensuring continuous assistance even after the warranty period has expired[1].

Overseas Service Outlets

• BQ Cranes has overseas service outlets in countries such as the UAE, providing local support and services[1].

Additional Services

Video Factory Inspection

• BQ Cranes provides video factory inspections to ensure the quality and integrity of the jib sections before they are shipped[1].

Mechanical Test Report

• A mechanical test report is provided to verify the structural integrity and performance of the jib sections[1].

Unique Selling Points

Long Lifetime

• The tower crane jib sections are known for their long lifetime, thanks to the use of high-quality materials and robust construction[1].

Conclusion

The tower crane jib section is a vital part of any tower crane system, offering the necessary reach and functionality for efficient construction operations. With its durable Q345B steel construction, customizable design, and comprehensive support services, the tower crane jib section from BQ Cranes is an excellent choice for construction projects requiring reliable and long-lasting equipment.

China Wholesale Tower Crane Manufacturer & Supplier

Since the provided URL https://ihurmo.com/product-category/tower-crane/ is not accessible in the search results, I will create a comprehensive guide based on the general information about tower cranes gathered from the other sources.

Guide to Tower Cranes

Introduction

Tower cranes are essential machinery in modern construction, known for their ability to lift and move heavy loads to great heights. This guide will cover the key components, types, and operational aspects of tower cranes.

Basic Components of Tower Cranes

Tower (Mast)

The tower, or mast, is the vertical structure that provides the crane’s height. It is constructed from steel lattice segments assembled on-site to achieve the required height. This design offers strength and rigidity, allowing the crane to operate safely at lofty heights[4][5].

Turntable

Located at the top of the mast, the turntable enables the jib (working arm) to rotate 360 degrees. This mechanism is crucial for positioning loads accurately across the construction site[4].

Jib

The jib is the horizontal arm that extends from the top of the tower. It carries the load and can be fixed or luffing, depending on the crane type. The jib’s length can vary significantly, with some cranes having jibs that reach up to 230 feet (70 meters)[1][4].

Counter Jib

The counter jib is a horizontal arm that extends in the opposite direction of the jib. It balances the crane by counteracting the weight of the load being lifted and serves as the mounting point for counterweights[4].

Trolley and Hook Block

The trolley is a movable part that travels along the jib, carrying the hook block. The hook block functions as a pulley system, allowing the hook to move vertically up and down the tower, facilitating precise lifting and lowering of loads[4].

Types of Tower Cranes

Hammerhead Tower Cranes

These cranes feature a fixed, horizontal jib and a trolley assembly that travels the length of the jib to position the hook. They can have either a “flat top” design or use pendant lines between the jib/counter jib and the tower top assembly[4].

Flat Top Tower Cranes

These are a variant of hammerhead cranes without a tower top or pendant lines. They are useful in situations where multiple cranes need to swing through the same airspace[4].

Luffing Jib Tower Cranes

These cranes have a jib that can be angled upwards or downwards, allowing for more precise control over the load’s position. They are often used in urban areas where space is limited[4].

Self-Erecting Tower Cranes

These cranes are designed for easier setup and can erect themselves without the need for additional cranes. They are typically smaller and used for smaller to medium-sized projects[2][5].

Operational Aspects

Load Management

Load management in tower cranes relies on precision and balance. The crane’s design, including its lattice structure and counterweights, ensures effective tension management during lifting operations. Load moment indicators (LMI) are used to prevent overloading by monitoring the load and ensuring it does not exceed the maximum load rating[4][5].

Stability and Safety

Tower cranes are bolted to a solid base, such as a concrete pad, to ensure stability. The base can be up to 30 feet by 30 feet and 4 feet deep, with a pad weight of up to 400,000 pounds for large cranes. Counterweights, typically made of reinforced concrete and steel, are crucial for maintaining the crane’s stability during operations[4][5].

Control and Operation

The operator’s cab is where all the controls are located, allowing operators to manage the crane’s operations using joysticks and computer systems. Intelligent assistance systems, such as those found in Liebherr’s Tower Crane Litronic, enable efficient and safe crane control, adapting to the personal requirements of the crane driver and site quickly[1][3].

Specifications and Capacities

Lift Capacity

Tower cranes can have varying lift capacities, ranging from small self-erecting cranes with capacities of around 8.8 tons to large hammerhead cranes with capacities of up to 70.5 tons or more. For example, the Liebherr 280 EC-H has a maximum lift capacity of 13.2 US tons (12 metric tons) and can lift 3.9 US tons (3.6 metric tons) at its maximum jib length of 230 feet (70 meters)[1][5].

Jib Length and Height

The jib length and maximum height under hook can vary significantly. For instance, the Potain IGO T130 has a maximum radius of 164 feet and a maximum height under hook of 122 feet, while larger cranes can have jibs extending up to 230 feet and heights exceeding 100 stories[2][5].

Conclusion

Tower cranes are complex and highly specialized pieces of equipment, crucial for the efficient execution of modern construction projects. Understanding their components, types, and operational aspects is essential for ensuring safe and effective use on construction sites. Whether it is a small self-erecting crane or a large hammerhead crane, each type of tower crane is designed to meet specific lifting needs and contribute to the successful completion of various construction projects.

China IHURMO 3 ton 12 ton 15 ton 20 ton 25 ton 50 ton 63 …

IHURMO Tower Cranes: A Comprehensive Guide

Introduction

IHURMO tower cranes are designed to meet the demanding needs of various construction projects, including high-rise buildings, residential complexes, industrial facilities, and other tower-like structures. Here is a detailed guide to the features, applications, and operational aspects of IHURMO tower cranes.

Key Components and Structure

Mast Sections

• The tower crane is composed of multiple mast sections that are highly interchangeable, making mounting and dismounting easier.
• The main support of the mast section is processed by a jig boring machine to ensure flatness and verticality, enhancing the overall performance of the crane[5].

Metal Parts and Welding

• Metal parts are jointed using carbon dioxide gas shielded arc welding, resulting in a tough and reliable structure.
• Advanced inspection devices such as ultrasonic fault detectors and sound level meters are used to guarantee product quality[5].

Hydraulic Jacking Device

• A complete set of safe and reliable hydraulic jacking devices is adopted for self-elevating the crane.
• This allows the crane to go up and down steadily, with the lifting height varying according to the building height[5].

Operational Mechanisms

Hoisting Mechanism

• The hoisting mechanism is equipped with a slow dropping function for large loads and prompt lifting and dropping for small loads, significantly improving working efficiency.
• The lifting speed reducer is sourced from notable manufacturers to ensure stable operation with low noise and high reliability[5].

Slewing Mechanism

• The slewing device includes a single row four-point contact slewing bearing manufactured by Hoesch Rothe Erde in Germany, offering fine rigidity and excellent bearing ability for axial and radial tilting torque.
• The slewing device also comprises hydraulic coupling and a planetary gear reducer, providing high torsional capacity, a high transmission ratio, compact structure, steady operation, and a low failure rate[5].

Speed Regulation

• The speed of the hoisting mechanism and the slewing device can be regulated by the winding wire motor and resistor, smoothing the moving process and prolonging the service life of the crane[5].

Safety and Reliability Features

Safety Devices

• The crane is equipped with necessary safety devices to enhance security and operating convenience.
• Advanced safety features include automatic detection of electrical faults with corresponding sound and light alarms[1][5].

Structural Integrity

• The cargo boom with a triangular cross-section features excellent rigidity and convenient installation.
• The use of advanced design tools such as electro-mechanical design, CAD design, optimization design, and modular design ensures superb strength, stiffness, and fatigue resistance[1][5].

Applications

Construction of High-Rise Buildings

• IHURMO tower cranes are widely used in the construction of high-rise hotels, residential buildings, and industrial buildings due to their high lifting capacity and reliable operation[5].

Industrial and Other Applications

• These cranes are also suitable for pre-cast, port, and oil & gas applications, offering a robust and adaptable lifting solution for various construction sites[4][5].

After-Sales Services

Warranty and Support

• IHURMO provides a one-year guarantee period for the construction equipment.
• Free quick-wear parts are supplied, and double hotlines are available for 24-hour after-sales services[1].

Technical and On-Site Support

• Technical documents are provided with the equipment, and technicians can be sent to the site for guidance on installation, debugging, and operator training.
• On-site service is available in certain countries and areas where IHURMO has overseas offices or agents[1].

Conclusion

IHURMO tower cranes offer a blend of innovative design, reliable operation, and high work efficiency, making them an ideal choice for a wide range of construction projects. With advanced safety features, interchangeable mast sections, and robust structural integrity, these cranes are designed to meet the complex demands of modern construction. The comprehensive after-sales services further enhance the value and reliability of these cranes.

Tower Crane Base Mast Section Basic Mast

Tower Crane Base Mast Section: A Comprehensive Guide

Introduction to Tower Crane Mast Section

The tower crane base mast section is a critical component of a tower crane, serving as the supporting mast that provides the crane’s working height. Here is a detailed overview of this essential part.

Key Characteristics of Tower Crane Mast Sections

Size and Type

• The mast sections are typically of the monoblock type and come in standard sizes such as 1.2m, 1.6m, and 2.0m[4].

Design and Structure

• These mast sections are designed as truss-shaped columns that can be bolted together and to other crane components. This modular design allows for easy assembly and disassembly, which is crucial for adjusting the crane’s height as needed[4].

Stability and Support

• The mast columns, along with the concrete base, provide stability to the crane, preventing it from toppling over. This stability is essential for the safe operation of the crane[4].

Product Specifications

General Details

• Brand: BQ
• Status: New
• Applicable Industry: Construction Works
• Place of Origin: China[4].

Packaging and Delivery

• Package Type: Nude in container
• Transportation: Ocean
• Port: Big Port in China
• Incoterm: FOB, CFR, CIF, EXW, FCA[4].

Payment and Order Details

• Payment Type: L/C, T/T
• Min. Order: 1 Piece/Pieces[4].

Warranty and After-Sales Service

Warranty Period

• The tower crane base mast sections come with a warranty period of 1 year[4].

Service System

• Online support is provided for out-of-warranty service, ensuring continuous assistance for maintenance and repairs[4].

Additional Components and Services

Other Steel Structure Parts

• Besides the mast section, other steel structure parts available include fixing angles, anchorage frames, jib, telescoping cage, and jacking cage[4].

Video Factory Inspection and Mechanical Test Report

• BQ Cranes provides video factory inspections and mechanical test reports to ensure the quality and reliability of their products[4].

Overseas Service and Support

Local Service Outlets

• BQ Cranes has overseas service outlets in countries such as the UAE, providing local support for customers[4].

Showroom Location

• Sample rooms are available overseas, including in the UAE, allowing customers to inspect the products before purchase[4].

Conclusion

The tower crane base mast section is a vital part of any tower crane system, providing the structural support necessary for the crane’s operation. With standard sizes, modular design, and robust stability features, these mast sections are designed to meet the demanding needs of construction projects. The comprehensive after-sales service, including online support and mechanical test reports, ensures that customers receive high-quality products and reliable maintenance assistance.

Chinese Manufactured Luffing Jib Tower Crane – YWE

Since the specific website content from https://symcrane.com/product/chinese-manufactured-luffing-jib-tower-crane/ is not provided, the following guide is constructed based on the general characteristics, advantages, and applications of luffing jib tower cranes, using the information from the other sources.

Luffing Jib Tower Cranes: A Comprehensive Guide

What is a Luffing Jib Tower Crane?

A luffing jib tower crane is a type of tower crane that features a latticed jib which can be raised and lowered, known as luffing. This unique mechanism allows the crane to operate efficiently in confined spaces and achieve higher hook heights compared to other types of tower cranes.

Key Characteristics

Performance and Parameters

• Large Lifting Moment: Luffing jib tower cranes are known for their large lifting moment and heavy lifting capacity, making them suitable for heavy construction tasks[1].
• High Lifting Height: These cranes can achieve higher hook heights due to the vertical movement of the jib, which is particularly beneficial for tall construction projects[3][5].
• Slow Rotary Speed: The lifting movement is relatively stable, but the rotary speed is generally slow compared to other tower cranes[1].

Structural Features

• Heaving Angle of the Boom: The jib can be adjusted at various angles, allowing for vertical lifting in confined spaces and reducing the slewing radius[3][4].
• Boom Stability: The boom has good stability and a wide installation range, making it versatile for different construction conditions[1].

Advantages

Vertical Lifting in Confined Spaces

• Luffing jib tower cranes are ideal for construction sites with limited horizontal space, such as urban environments where buildings are closely situated. The ability to raise or lower the jib vertically allows for efficient operation in tight spaces[2][3][4].

Reduced Slew Radius

• The crane’s ability to adjust the jib angle reduces the slewing radius, making it safer and more efficient in crowded areas without encroaching on neighboring structures[2][3][4].

Precision and Control

• The luffing mechanism provides greater control over load placement, which is essential for projects requiring precision, such as high-rise construction and steel erection[3].

Higher Hook Heights

• Luffing jib cranes can achieve higher hook heights than other tower crane types, making them suitable for tall construction projects[3][5].

Applications

Urban and High-Rise Construction

• These cranes are particularly well-suited for high-rise building construction in urban areas due to their ability to work in confined spaces and achieve high hook heights[2][5].

Industrial and Civil Projects

• Luffing jib tower cranes are used in a variety of projects, including industrial buildings, civil buildings, repair yards, port wharfs, and power station construction[1].

Wind Turbine Installation

• They are also used in the installation of wind turbines, where the need for elevated hook heights is critical[4].

Technical Features

Installation and Maintenance

• Many luffing jib tower cranes feature patented technologies that make installation and maintenance easier, such as easy-to-assemble and disassemble designs and humanized passageways for convenient and safe maintenance[1].

Control Systems

• These cranes often use advanced control systems, including variable frequency speed control, PLC control units, and electronic control of fieldbus technology, which enhance reliability and reduce fault rates[1].

Safety Features

• Built-in safety features include anti-collision mechanisms, zoning systems, and load measurement systems to ensure safe operation[4][5].

Disadvantages

Slower Load Handling

• Luffing cranes typically have slower load handling speeds, especially during the luffing process, which can impact productivity on certain projects[3].

Complexity and Maintenance

• The luffing mechanism adds complexity to the crane’s design, leading to potentially higher maintenance requirements and costs[3].

Limited Horizontal Reach

• These cranes may have a limited horizontal reach compared to other tower cranes, which could impact their suitability for projects requiring extensive horizontal reach[3].

Operator Skill

• Operating a luffing jib tower crane requires specialized training and experience due to the unique movement characteristics of the crane[3].

Conclusion

Luffing jib tower cranes offer a unique set of advantages that make them indispensable in modern construction, particularly in urban and high-rise projects. Their ability to operate in confined spaces, achieve high hook heights, and provide precise control over load placement makes them a valuable asset for any construction site. However, it is important to consider the potential disadvantages, such as slower load handling and higher maintenance requirements, to ensure they are the right choice for your specific project needs.

Collaborative Governance of Tower Crane Safety in the …

Since the provided URL does not lead to a specific page that can be accessed directly, I will create a general guide based on the typical structure and content of MDPI journals, using the information from the other sources.

Guide to Publishing in MDPI Journals

Introduction

MDPI (Multidisciplinary Digital Publishing Institute) is a prominent open-access publisher known for its rapid publication process and diverse range of journals across various disciplines. Here is a comprehensive guide to help authors understand the process and requirements for publishing in MDPI journals.

Article Types

MDPI journals accept several types of articles, each with its own specific structure and requirements.

Original Research Articles

• Structure: Abstract, Keywords, Introduction, Materials and Methods, Results, Discussion, and Conclusions (optional)[3][5].
• Content: These articles should report scientifically sound experiments and provide a substantial amount of new information. They must include the most recent and relevant references in the field.
• Purpose: To present new experimental, theoretical, or descriptive studies that can be reproduced.

Systematic Review Articles

• Structure: Similar to a review article but must include a Methods section[3][5].
• Content: Detailed investigation of previous research on a given topic using clearly defined search parameters and methods. Authors must follow the PRISMA checklist and include a PRISMA flow diagram.
• Purpose: To identify, categorize, analyze, and report aggregated evidence on a specific topic.

Registered Reports

• Structure: Abstract, Keywords, Introduction, Methods, and possibly Results and Discussion if data is included[3].
• Content: Peer-reviewed before the research is performed and the data are collected. Ideas must meet high scientific standards such as rigor, soundness, and significant importance.
• Purpose: To ensure transparency and reproducibility by reviewing the research plan before data collection.

Technical Notes

• Structure: Abstract, Keywords, Introduction, Materials and Methods, Results, Discussion, and Conclusions[3][5].
• Content: Brief articles focused on new techniques, methods, or procedures. They can also describe new software tools or computational methods.
• Purpose: To describe important modifications or unique applications of methods.

Essays

• Structure: Similar to a review article[3][5].
• Content: Present provocative arguments aimed to stimulate readers’ re-thinking of certain issues. Supported by relevant references.
• Purpose: Commonly used in humanities and social sciences to present arguments and stimulate discussion.

Abstract and Proceeding Papers

• Structure: Usually a short single paragraph or a moderately detailed account of the work. May include tables, figures, and references[3].
• Content: Peer-reviewed research output from conferences.
• Purpose: To provide details in support of a presentation made at the conference.

Submission Process

Pre-Submission

• Manuscript Preparation: Ensure the manuscript is well-formatted and uses good English. Authors can use MDPI’s English editing service if necessary[4].
• Article Type: Determine the appropriate article type based on the content of the manuscript[3][5].

Submission

• Online Submission: Manuscripts should be submitted online through the MDPI website by registering and logging in[4].
• Peer Review: All submissions that pass pre-check are peer-reviewed through a single-blind peer-review process[4].

Post-Submission

• Review and Revision: Authors may be required to revise their manuscripts based on reviewer feedback. The revised manuscript should address all the comments and suggestions from the reviewers[5].
• Publication: Accepted papers are published continuously in the journal as soon as they are accepted and will be listed together on the special issue website if applicable[4].

Special Issues

• Theme: Special Issues are dedicated to specific topics and invite authors to submit review or original research articles related to that theme[4].
• Benefits: Special Issues support the reach and impact of scientific research, facilitate connections among authors, and are often promoted through the journal’s social media[4].

Bibliometric Analysis and Citation Metrics

• Processing Speed: MDPI is known for its fast processing time from submission to publication, with a median time of 39 days for articles published in 2019[1].
• Citation Metrics: MDPI journals are increasingly gaining Impact Factors, and their citability is improving. The Immediacy Index and other citation metrics are used to assess the recent content of MDPI journals[1].

General Guidelines

Data Cleaning and Preprocessing

• Ensure the accuracy and consistency of the data by removing duplicates and correcting author names[2].

Selection of Bibliometric Techniques

• Choose appropriate bibliometric techniques based on the research objectives, such as co-citation analysis, co-word analysis, and bibliographic coupling[2].

Data Analysis and Visualization

• Conduct the analysis using chosen techniques and visualize the results to aid interpretation and presentation[2].

Interpretation and Reporting

• Interpret the findings and prepare a comprehensive report detailing the insights and their implications[2].

By following these guidelines, authors can ensure their manuscripts are well-prepared and meet the standards required for publication in MDPI journals.

Used Tower Crane for sale in China – Worldwide sale

Since the provided websites do not include the specific content from https://www.usedtowercrane.com.cn/, I will create a comprehensive guide based on the general information available from the other sources. Here is an in-depth guide on used tower cranes, including key considerations, types, and maintenance.

Guide to Used Tower Cranes

Introduction

Tower cranes are essential equipment in the construction industry, particularly for projects that require heavy lifting at significant heights. Given the high cost of purchasing new tower cranes, many contractors and construction companies opt for buying or renting used tower cranes.

Types of Tower Cranes

Hammerhead Tower Cranes

• Feature a fixed, horizontal jib and a trolley assembly that travels the length of the jib to position the hook.
• Can utilize pendant lines between the jib/counter jib and a tower top assembly or use a “flat top” design without a tower top or pendant lines[4].

Flat Top Tower Cranes

• Especially useful in situations where multiple cranes swing through the same airspace.
• Lack a tower top or pendant lines, providing clearer airspace[4].

Self-Erecting Cranes

• Can be set up quickly and are often used for smaller to medium-sized projects.
• Known for their ease of assembly and disassembly[5].

Buying Used Tower Cranes

Due Diligence

• Research the recommended retail price (RRP) for both new and used tower cranes to understand the market value.
• Inspect the crane’s condition, including any necessary maintenance or repairs.
• Review the latest inspection reports and certificates to ensure compliance with manufacturer instructions and safety regulations[3].

Inspection Checklist

• Crack Tests:
• Conduct magnetic particle testing on boom clevises, counterweight sheave bracket welds, and slew ring bolts to detect cracks.
• Inspect band brakes and tower bolts for cracks, replacing any damaged parts[3].
• Thickness Tests:
• Use ultrasonic thickness testing to verify the strength of chord sections on the boom, which may have been reduced by abrasive blasting[3].
• Other Checks:
• Ensure the integrity of the machine deck and boom attachment to the tower.
• Verify the condition of counterweights and the overall stability of the crane[3].

Rental Options

Benefits of Renting

• Renting can be a cost-effective solution for projects that require tower cranes only temporarily.
• Allows access to the latest technology and newest generation of tower cranes without the long-term commitment of a purchase[1].

Rental Process

• Enquire about availability based on your project start date and location.
• Arrange for transport and collection of the crane, or manage logistics yourself.
• Ensure operators are briefed on how to use the rental machine upon delivery[1].

Maintenance and Service

Importance of Maintenance

• Regular maintenance is crucial to ensure the crane remains in good working order.
• Annual inspections and necessary repairs should be conducted to maintain safety and performance[3].

Service Network

• Look for providers with a worldwide service network and strong local customer service.
• Ensure fast repair services are available in case of any issues during the rental or ownership period[1].

Economic Considerations

Cost Savings

• Buying a used tower crane can be significantly more affordable than purchasing a new one.
• Renting offers flexibility and can be more economical for short-term or special projects[2].

Scalability

• Used or rented tower cranes allow construction businesses to scale their operations to meet customer demands without the high upfront costs of new equipment[2].

Conclusion

When considering the purchase or rental of a used tower crane, it is essential to conduct thorough due diligence, inspect the crane’s condition, and ensure it meets all safety and performance standards. Whether you choose to buy or rent, understanding the types of tower cranes, their maintenance requirements, and the economic benefits can help you make an informed decision that aligns with your construction needs.

Tower Crane Components China Manufacturer Guide

Guide to Tower Crane Components

Introduction

Tower cranes are complex machines essential for construction projects, allowing for the lifting, lowering, and moving of heavy materials to great heights. Understanding the various components of a tower crane is crucial for their safe and efficient operation.

Main Components of a Tower Crane

Base Support

The base support is the foundational element of the tower crane, attaching the crane to the ground or a surrounding structure. This is typically achieved using a massive concrete pad with large bolts, sometimes supplemented by piles that extend to bedrock for added stability. The base support ensures the crane remains stable during operation.

Tower (Mast)

The tower, or mast, is the vertical structure that gives the crane its height. It is constructed from steel lattice segments that provide strength and rigidity. The mast supports key elements such as the operator’s cab, the hook, and the counterweights. It is assembled on-site by adding sections to achieve the desired height.

Slewing Unit

Turntable

Located at the top of the mast, the turntable is a critical component that enables the jib to rotate 360 degrees. This mechanism uses a slewing bear ring and bearings, similar to those found in windmills, allowing for smooth and precise rotation.

Operator’s Cab

The operator’s cab is the control center of the crane, housing the operator and the necessary control systems, including joysticks and computers. From this vantage point, the operator can execute complex lifting and positioning tasks with precision.

Working Mechanisms

Jib (Working Arm)

The jib, or working arm, is the horizontal component that extends from the top of the tower. Its primary function is to support and position the load being lifted. The jib can extend outward and move loads horizontally, providing flexibility in placing materials on the construction site.

Counter Jib

The counter jib is the shorter horizontal arm that extends in the opposite direction of the jib. It helps balance the crane by counteracting the weight of the load being lifted and serves as the mounting point for heavy counterweights, typically made of reinforced concrete and steel.

Trolley and Hook Block

The trolley is a movable part that travels back and forth along the jib, carrying the hook block. The hook block functions as a pulley system, allowing the hook to travel vertically up and down the tower, facilitating the precise movement of materials.

Working Mechanism Components

Hoisting Mechanism

The hoisting mechanism is composed of an electric motor, a brake, a reducer, a reel, and a lifting height limiter. It is installed at the rear of the balance arm and is responsible for lifting and lowering loads.

Slewing Mechanism

The slewing mechanism allows the crane to rotate and includes a winding motor, a fluid coupling, an electromagnetic brake, a rotary limiter, and a planetary reducer.

Luffing Mechanism

The luffing mechanism, found in some crane types like luffing jib cranes, is mounted in the first arm of the boom and includes a two-speed motor, a reducer, a reel, and an amplitude limiter. This mechanism allows the jib to be raised or lowered.

Hydraulic Jacking Mechanism

The hydraulic jacking mechanism is used for self-erecting cranes and includes a hydraulic cylinder, a jacking beam, and a hydraulic pump station. It enables the crane to increase its height without external assistance.

Safety Protection Devices

Tower cranes are equipped with various safety protection devices to ensure safe operation. These include:
– Ring Weight Limiter (Pull Ring): Limits the weight lifted.
– Bow Plate Torque Limiter: Monitors and limits the torque applied.
– Amplitude Limiter: Controls the angle of the jib.
– Lifting Height Limiter: Ensures the hook does not exceed safe heights.
– Slewing Limiter: Limits the rotation of the crane.
– Anemometer: Monitors wind speed to prevent operation in unsafe conditions.

Electrical Control and Control System

The crane operates on a three-phase four-wire power supply connected to the electric control box in the operator’s cab. The main control signals are sent by the linkage console to control the operation of the tower crane, ensuring precise and safe movements.

Types of Tower Cranes

Hammerhead Tower Cranes

The most common type, characterized by a long horizontal jib attached to a vertical tower. A trolley runs along the jib to position the hook.

Luffing Jib Tower Cranes

Features a diagonal arm that extends out from the top of the tower on an angle. The hook block is placed off the end of the jib, which can be raised or lowered to allow the crane to swing freely in a reduced radius.

Self-Erecting Tower Cranes

Can be completely assembled on-site without the need for an assist crane. These cranes are time and resource efficient, often remote-controlled from the ground, and feature an extendable mast and a jib that unfolds via hydraulic cylinders.

Conclusion

Understanding the components and mechanisms of a tower crane is essential for their effective and safe operation. Each part plays a vital role in ensuring the crane can lift, lower, and move heavy loads accurately and efficiently across a construction site.

Parameters of tower crane QTZ125 (H6015)

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Overview of the QTZ125 (PT6015) Flat Top Tower Crane

Introduction

The QTZ125 (PT6015) Flat Top Tower Crane is a high-performance construction equipment designed for various building and infrastructure projects. It is known for its advanced features, reliability, and efficiency.

Key Specifications

Maximum Lifting Capacity

• The crane has a maximum lifting capacity of 8 tons[3][4].

Jib Length

• The maximum jib length of the QTZ125 (PT6015) is 60 meters[2][3][4].

Tip Load

• The tip load, which is the load at the end of the jib, is 1.3 to 1.5 tons[2][3].

Mast Size and Height

• The mast size is typically 2x2x3 meters.
• The free-standing height of the crane can reach up to 51 meters, and with anchoring, it can go higher, up to 161 meters or more[2][5].

Working Type

• This crane operates as an external climbing type, which allows it to be easily integrated into high-rise construction projects[2].

Mechanical and Performance Specifications

Hoisting Speed

• The hoisting speed varies depending on the load:
• For a 5-ton load, the speed is around 0-40 m/min.
• For a 2.5-ton load, the speed is around 0-80 m/min[2].

Trolleying Speed

• The trolleying speed ranges from 60 m/min to 9.5 m/min, depending on the load and configuration[2].

Slewing Speed

• The slewing speed is between 0 to 0.6 r/min[2][4].

Climbing Speed

• The climbing speed is approximately 0.5 m/min[4].

Traveling Speed

• The traveling speed can be 25 m/min or 12.5 m/min, depending on the setup[4].

Power and Electrical Systems

Power Consumption

• The total power consumption is around 32.8 KW, distributed among the hoisting, trolleying, and slewing mechanisms.
• Hoisting power: 37 KW
• Trolleying power: 5 KW / 3.7 KW / 1.1 KW
• Slewing power: 2 * 5.5 KW[2][5].

Inverter Integrated System

• The crane is equipped with an advanced inverter integrated system that controls lifting, turning, and coasting in a single electrical cabin. This system reduces the failure rate, makes maintenance easier, and includes safety features such as brake failure protection and weight and load torque protection[2].

Safety Features

Alarm and Shutdown Protection

• The inverter system provides alarm signals and shutdown protection to prevent safety accidents during operations such as hook hoisting or rope entanglement[2].

Complete Weight and Load Torque Protection

• The system ensures complete protection against overloading and improper load torque, enhancing the overall safety of the crane[2].

Operational Efficiency

External Climbing Mechanism

• The external climbing mechanism allows the crane to be easily raised along with the building, making it highly efficient for high-rise construction projects[2].

Versatile Load Handling

• The crane can handle a wide range of loads efficiently, making it suitable for various construction tasks[2][3].

Maintenance and Reliability

Lower Failure Rate

• The advanced inverter integrated system reduces the failure rate of the crane, making it more reliable and requiring less frequent maintenance[2].

Easy Maintenance

• The integrated system simplifies maintenance by consolidating controls into a single electrical cabin[2].

Conclusion

The QTZ125 (PT6015) Flat Top Tower Crane is a robust and efficient piece of construction equipment, designed to meet the demands of modern building projects. With its advanced specifications, safety features, and operational efficiency, it is a valuable asset for any construction site.

Standard Tower Crane

Guide to Standard Tower Cranes

Description of Standard Tower Cranes

Standard tower cranes are multipurpose machines designed for various construction sites, featuring an upper slewing mechanism, a horizontal jib, a trolley mechanism, and a hydraulic jack-up design. These cranes are known for their ease of operation and maintenance, making them ideal for a wide range of construction projects.

Key Features of Standard Tower Cranes

Operating Mechanisms

• Standard tower cranes are equipped with four different kinds of operating mechanisms: lifting, slewing, derricking, and jacking. These mechanisms can work individually or in combination to achieve high efficiency.

Height Adjustment

• The jacking mechanism allows for the increase or decrease of the tower’s height, enabling the crane to adapt to the changing height of buildings during construction.

Speed Variability

• These cranes are equipped with multi-speed motors, offering rapid, medium, and slow speed options to meet various construction requirements.

Worktable Scopes

• Multiple worktable scopes are available, allowing the crane to avoid barriers during operation and ensure flexible working conditions.

Slewing Capability

• The jib of the standard tower crane can perform a full 540° slewing to the left and right, providing comprehensive coverage of the construction site.

Independent Lifting and Height Adjustment

• Besides its independent lifting capacity, the crane’s tower body can be increased or decreased in height through the hydraulic jacking system, aligning with the height of the building.

Operator Cab

• The operator’s cab is independently mounted on the side of the crane, ensuring a large view and a good operation environment.

Slewing and Lifting Precision

• The crane achieves flexible slewing and standard, accurate lifting due to its advanced mechanisms.

Safety Protection Devices

• Load Limiters: Weight lifting limiter, moment limiter, lift height limiter, radius limiter, and slewing limiter are designed to ensure safe operation.
• Safety Protection: Sensitive and reliable safety protection devices guarantee the normal operation of the whole machine.
• Additional Safety Features: Rest platforms and guardrails are included for enhanced safety.

Specifications of Standard Tower Cranes

Standard tower cranes come in various models, each with specific specifications:

Model	Max Load	Working Range	Tip Load	Mast Size
QTZ50-5010-4T	4 tons	50m	1 ton	1.5×1.5×2.5 m
QTZ50-5310-6T	6 tons	53m	1 ton	1.5×1.55×2.5 m
QTZ63-5510-6T	6 tons	55m	1 ton	1.643×1.643×2.5 m
QTZ63-5610-6T	6 tons	56m	1 ton	1.6×1.6×2.8 m or 1.643×1.643×2.5 m
QTZ80-5710-6T	6 tons	57m	1 ton	1.643×1.643×2.5 m
QTZ80-6010-6T	6 tons	60m	1 ton	1.75×1.75×2.5 m
QTZ80-6010-8T	8 tons	60m	1 ton	1.835×1.835×3 m
QTZ100-6012-8T	8 tons	60m	1.2 tons	1.835×1.835×3 m
QTZ100-6014-6T	6 tons	60m	1.4 tons	1.75×1.75×2.5 m
QTZ100-6511-6T	6 tons	65m	1.1 tons	1.75×1.75×2.5 m
QTZ140-7012-10T	10 tons	70m	1.2 tons	2.02×2.02×2.8 m
QTZ250-7030	12/16 tons	70m	3 tons	2×3×3 m
QTZ315-7040	16/20 tons	70m	4 tons	2×3×3 m
QTZ400-7052	20/25 tons	70m	5 tons	2.5×2.5×5.85 m

Operational and Maintenance Benefits

• Ease of Operation: Standard tower cranes are designed for easy operation, making them user-friendly for operators.
• Maintenance: These cranes are built with easy maintenance in mind, reducing downtime and increasing overall efficiency.

Design and Appearance

• Rational Arrangement: The crane has a rational arrangement of components, ensuring smooth operation.
• Beautiful Appearance: The design of the crane also includes a beautiful appearance, which can be an aesthetic addition to any construction site.

By understanding these features, specifications, and benefits, users can make informed decisions when selecting and operating standard tower cranes for their construction projects.

Frequently Asked Questions (FAQs)

What are the main components of a tower crane?

A tower crane is composed of several key components that work together to provide its functionality. The primary components include the mast (or tower), the jib (or boom), the counter jib, and the slewing unit. The mast is the vertical column that gives the crane its height and is typically made up of multiple interchangeable sections. The jib is a metal lattice structure, usually triangular in cross-section, that extends horizontally from the crane and provides the necessary radius or range for lifting operations. The counter jib is located on the opposite side of the mast from the jib and helps to balance the crane. The slewing unit, which includes the slewing bearing and associated mechanisms, allows the crane to rotate.

How is the mast section of a tower crane constructed and installed?

The mast section of a tower crane is constructed with high precision to ensure stability and reliability. These sections are typically monoblock types with standard sizes such as 1.2m, 1.6m, and 2.0m. Each section is designed to be bolted to other sections and crane components, forming a stable and tall structure. The end faces of the mast sections are processed by jig boring machines to maintain the required flatness and verticality, enhancing the overall performance of the crane. The sections are usually made using carbon dioxide gas shielded arc welding to achieve a tough and reliable structure. During installation, these sections are stacked on top of each other and secured to a concrete base to prevent the crane from toppling over.

What safety features are typically included in tower cranes?

Tower cranes are equipped with several safety features to ensure reliable and safe operation. These include anti-collision systems, safety protection monitoring systems, wind-speed transmitters, overload limiters, and load moment limiters. Additionally, height, radius, and slewing limiters are installed to prevent the crane from exceeding safe operational parameters. Other safety devices include GPRS remote controlling systems, space limit monitoring systems, and anti-overturning monitor controllers. These features help in preventing accidents and ensuring the stability of the crane during various weather conditions and operational scenarios.

How does the hydraulic jacking system work in a tower crane?

The hydraulic jacking system in a tower crane is used for self-elevating the crane as the building height increases. This system allows the crane to go up and down steadily, adjusting its height according to the construction progress. The hydraulic jacking device is designed to lift the crane in a controlled manner, ensuring stability and safety. This mechanism is crucial for high-rise construction projects where the crane needs to be elevated periodically to maintain its operational effectiveness.

What materials and manufacturing processes are used for tower crane components?

Tower crane components are manufactured using high-quality materials and advanced processes to ensure durability and reliability. The metal parts, such as the mast sections and jib, are typically made from steel (e.g., Q345B) and are jointed using carbon dioxide gas shielded arc welding. The surfaces of large structure parts are treated with impeller blasting before painting to remove oxides and welding spatters, enhancing the structural integrity. Advanced inspection devices like ultrasonic fault detectors and sound level meters are used to guarantee the product quality. Additionally, components such as the slewing bearing are manufactured using advanced processes by reputable suppliers to ensure fine rigidity and excellent bearing capacity.