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Delivery of 150-ton Double-girder Gantry Crane for Beijing Urban Construction Rail Transit Project
Nation: Beijing Urban Construction Rail Transit Project
Beijing Urban Construction Rail Transit Construction Engineering Co., Ltd. undertook a prefabricated component construction project for urban subway tunnels.
Beijing Urban Construction Rail Transit Construction Engineering Co., Ltd. undertook a prefabricated component construction project for urban subway tunnels. The construction site requires large-tonnage gantry cranes for the transportation, hoisting and assembly of shield segments, large prefabricated bridge components and heavy construction steel formworks. Featuring open-air operation, day-and-night continuous construction and fluctuating loads, the site poses extremely high requirements on equipment load-bearing capacity, overall wind resistance and safety braking systems. After multiple rounds of technical solution comparison and on-site factory inspections, the customer finally customized the MG150t long-span bridge and road dedicated gantry crane from Henan Dafang Heavy Machinery.
Project Execution & Solution Overview
Dafang Heavy Machinery Co., Ltd. customizes an MG150t large-span portal crane for road and bridge construction applications. Key project milestones and engineering solutions included:
Custom Long-span Heavy-duty Configuration for Prefabrication Yard
This gantry crane features a rated lifting capacity of 150 tons and adopts a long-span main girder structure adapted to ultra-wide prefabrication yards. Dafang’s technical team conducted multiple on-site surveys on site dimensions, foundation bearing capacity and urban wind control standards, and optimized the heavy-duty structure, outdoor anti-corrosion performance and variable-frequency safety control system to fully meet the hoisting requirements of rail transit prefabricated components.
Strict Non-standard Manufacturing Process for 100-ton-class Equipment Quality
As a super-large non-standard 100-ton-class gantry crane, the equipment undergoes multiple rigorous processes including structural welding, non-destructive testing, full-machine load testing and anti-corrosion coating. The whole manufacturing cycle lasts 68 days. High-standard full-process quality inspection ensures structural strength, welding accuracy and anti-corrosion performance for long-term stable heavy-duty operation.
The super-large gantry crane was transported to the Beijing construction site in separate batches. Our professional engineering team completed the whole process including main girder splicing, track laying, load pressure testing and safety inspection. The equipment passed the safety acceptance of the urban construction group in one single pass and was officially put into operation.
Adapt to High-intensity All-weather Engineering Construction
Designed with a high working class for engineering projects, the crane adapts to high-intensity all-weather continuous construction and frequent load fluctuations, with excellent structural fatigue resistance and deformation resistance, fully fitting the construction rhythm of municipal rail transit infrastructure projects.
Core Technical Features & Advantages
Super-heavy Long-span Box-type Main Girder
The crane adopts a dual-girder ultra-wide box welded structure. Both main girders and legs are made of thickened Q355 high-strength low-alloy steel plates. The extended main girder adapts to wide working spaces of prefabrication yards with high overall rigidity and no obvious deflection under full load. All load-bearing welds pass 100% ultrasonic non-destructive testing. Designed for high-level engineering operation, it supports 24-hour uninterrupted hoisting of heavy prefabricated parts such as shield segments and bridge steel formworks, resisting fatigue and cracking under long-term heavy loads.
Level-8 Wind-resistant Outdoor Steel Structure
The crane is equipped with widened and thickened leg support structure and heavy-duty travelling trolleys, increasing overall self-weight to achieve a standard Level-8 wind resistance, suitable for open-air construction in windy seasons. The whole machine adopts three-layer epoxy zinc-rich industrial anti-corrosion coating with Dafang’s signature red topcoat, featuring UV resistance and dust & rain erosion resistance. All ladders, maintenance platforms and guardrails are hot-dip galvanized for long-term outdoor rust prevention.
Multi-layer Safety Protection Electrical Control System
The full electrical system adopts variable-frequency speed regulation with dual braking protection for hoisting and travelling mechanisms. It is equipped with complete safety devices including overload limit, height limit, stroke limit, emergency stop and real-time wind speed monitoring, which automatically lock the travelling mechanism in strong wind. The control cabinet reaches IP54 dustproof and waterproof grade. Dual operation modes (cab centralized control + ground remote control) ensure intuitive and safe operation in line with urban construction safety specifications.
Dual-trolley Synchronous Lifting Structure for Stable Hoisting
Equipped with dual hoisting trolley combined lifting gear, the crane realizes two-point synchronous hoisting for heavy shield segments with uniform stress distribution, avoiding cracking and collision damage of concrete prefabricated parts. Wear-resistant and high-strength pulley blocks and steel wire ropes are adopted. The versatile lifting gear adapts to various specifications of segments and bridge formworks, greatly improving the efficiency of component transportation, stacking and loading in prefabrication yards.
On-Site Delivery & After-Sales
Due to its super-large size, the 100-ton-class gantry crane was transported to the site in separate batches. Our senior installation engineers stayed on-site to complete full procedures including main girder splicing, track calibration, electrical wiring and full-load pressure testing. Complete engineering inspection documents such as material test reports, factory certificates and third-party load test certificates were delivered for safety filing.
On-site practical training was provided for operation and maintenance teams, covering wind-resistant operation specifications and daily maintenance of heavy-duty equipment. Lifelong remote technical support and sufficient original core accessories ensure on-time completion of the rail transit project.
Summary
The delivered MG150t long-span bridge gantry crane is a large-tonnage heavy-duty equipment specially developed by Dafang Heavy Machinery for subway, tunnel and bridge prefabrication projects. Its core advantages of strong wind resistance, high safety and stable long-span operation perfectly meet the construction demands of Beijing urban construction rail transit prefabrication yards. Dafang Heavy Machinery can customize 50t-300t long-span bridge & road gantry cranes for municipal, rail transit and bridge engineering enterprises, providing one-stop services including on-site survey, solution design, manufacturing, on-site installation and engineering document support. Customized solutions and quotations are available for all infrastructure lifting equipment demands.
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