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High-speed railway
2023-01-11
A Comprehensive Guide to Troubleshooting Common Faults in Bridge Cranes
Bridge cranes are indispensable equipment in modern industrial production, widely used in operations such as lifting, transporting, loading and unloading, and installation of various goods. They play a significant role in enhancing labor productivity.
2023-01-11
What is the difference between a bridge crane and an gantry crane?
A beam-lifting machine is a piece of equipment characterized by significant variations in lifting capacity and load distribution; its body weighs approximately 40 tons, making disassembly, assembly, and control relatively challenging. In contrast, an gantry crane is a highly flexible, multi-hook, beamless operational device, featuring wide upright columns that serve as lifting hooks, with hook diameters and four or five suspension cables. When hooks are combined with suspension cables, the effective hook length can reach up to 10 meters (in configurations such as five-cable, six-cable, or seven-cable setups). Moreover, the upright columns can be interconnected via hooks to form multi-cable arrangements of five or six cables, among others. Consequently, beam-lifting machines tend to be more agile and lightweight, whereas gantry cranes generally exhibit a more complex structural design.
2023-01-11
Technical Requirements for Gantry Cranes
A girder launcher is a gantry crane specifically designed for bridge construction. It primarily consists of a modular main girder, support legs, and an overhead traveling crane. The components are connected by pin joints and high-strength bolts, facilitating disassembly and transportation; compared with conventional gantry cranes, it offers convenient, rapid, economical, and practical installation. It is particularly suitable for road and bridge construction companies that frequently relocate their operations.
2023-01-11
What are the causes of bridge-launching machine accidents?
With the development of railway construction, the use of bridge-launching machines has become increasingly frequent, and overturning accidents involving such equipment occur from time to time. The causes of these accidents can be attributed to the following factors:
2023-01-11
Analysis of the Causes of Bridge-Erecting Machine Accidents – Introduction to Human Factors
With the development of railway construction, the use of bridge-launching machines has become increasingly frequent, and overturning accidents involving these machines occur from time to time.
2023-01-11
Bridge Erection Machine – Strictly Implement the Supervision System to Ensure Construction Quality
The “Rules for Girder Erection Using Railway Bridge-Erecting Machines” stipulate that the track-laying contractor must provide the bridge-erection contractor with documentation on the compaction status of the abutment fill. This requirement stems from the fact that most bridge-erection machine overturns are caused by issues related to the abutment fill, such as the presence of cast-in-place stone blocks or frozen soil lumps, or failure to compact the fill in uniform layers—conditions that are well understood only by the track-laying contractor and can be identified only through inspection by the bridge-erection contractor.
2023-01-11
Accident Prevention When Operating a Bridge-Erecting Machine
The bridge-erection unit must implement effective measures to strengthen education and publicity, ensuring that employees recognize the critical role of bridge-erection machines in railway construction and understand that their work will have a major impact on whether the railway project is completed on schedule, thereby safeguarding the safety of national and public life and property.
2023-01-11
Operating Procedures for Bridge Erection Machines
The designated heights on both sides of the longitudinal travel rails for the bridge-erection machine shall be horizontally stable. The transverse travel paths of the front, middle, and rear legs shall be horizontal, and their spacing shall be strictly controlled. All three sets of rails must be parallel.
2023-01-11
Introduction to the Double-Girder Bridge Erection Machine
The Hongqi bridge-erection machine and the Liaoyuan bridge-erection machine both fall into this category, with a lifting capacity of 130 tonnes. Its boom consists of left and right box girders that run through the main body and extend outward to the front and rear ends.
2023-01-11
An Introduction to Single-Girder and Double-Cantilever Bridge-Erecting Machines
One type of bridge-construction machinery features a box-girder boom that cantilevers forward, with a foldable vertical column at the front end composed of left and right legs. The machine can self-propel onto the bridge under no-load conditions, after which the front column is erected and braced against the forward pier. As the girder segments (or entire girders) are moved along the lifting booms, the booms effectively behave like simply supported beams. During bridge erection, the machine can also self-propel onto the bridge when unloaded. First, a dedicated gantry crane is used to transfer the girders from railway flatcars to a specialized girder transporter. The transporter then aligns with the rear end of the bridge-erection machine, and two girder-lifting trolleys running on the machine’s boom lift the girders into position.
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