The importance of using Bailey bridge steel panels and the construction of support frames.

The Bailey panel has the characteristics of simple structure, convenient transportation, quick assembly, and large load-bearing capacity. The Bailey steel bridge is a rapidly assembled bridge developed based on the original British Bailey truss bridge, combined with China's national conditions and practical situations. It was finalized in 1965 and has developed significantly in China. It is widely used in national defense, combat readiness, transportation engineering, and municipal water conservancy projects. It is a type of prefabricated bridge widely used in China. Bailey panels can be used for highway bridges, assembled gantry cranes, guide beams, bridge erecting machines, and hanging baskets.

The "HD200" prefabricated highway Bailey panel steel bridge increases the truss height, load-bearing capacity, stability, fatigue life, and reliability. Compared to the 321 steel bridge, under the same combination, the strength is increased by 33%, and the stiffness is increased by 2.3 times. Applicable range: single-lane bridge deck net width 4.2M, combined span 9.14-76.2M, double-lane bridge deck net width 7.4M, combined span 9.14-57.91M.

Requirements for scaffold erection:

1) The design dimensions must be set strictly according to the requirements in the specifications, and the joints of the vertical and horizontal rods need to be staggered on different grid layers;

2) Ensure that the vertical deviation of the vertical rods and the horizontal deviation of the horizontal rods are not too large, generally required to be less than the requirements in the "Safety Technical Specifications for Construction of Coupled Steel Pipe Scaffolding" in JGJ130-2001;

3) Ensure that the quality of each coupler and steel pipe fully meets the requirements, and the tightening torque of each coupler should be controlled between 45 and 60. Deformed steel pipes that have been used for a long time cannot be selected;

4) The design of the foundation bearing capacity should meet the load-bearing requirements.

Bailey bridges are widely used around the world, and the Z bridge is a popular bridge type. It has the characteristics of simple layout, convenient transportation, quick assembly, and easy identification. At the same time, it has the advantages of large load-bearing capacity, strong structural rigidity, and long service life. It can form various types and uses such as combinations, emergencies, and static based on different spans required, with the characteristics of fewer components, lighter weight, and lower cost.

Bailey bridges starting with Z were planned and built by British engineers at the end of World War II in 1938. During World War II, this military steel bridge was used in small quantities. After the war, many countries modified the Bailey panel steel bridge for civilian use. Today, the Bailey panel steel bridge plays an irreplaceable role in transportation erection and flood relief.

In the early 1960s, the Bailey panel steel bridge was a coveted facility highway steel bridge in China, which is the "321" detachable highway steel bridge that is still widely used and produced today. The 31 highway steel bridge consists of truss beams, bridge deck systems, connection systems, and structures, and is equipped with special erection equipment. The maximum span is 70 meters, and the aisle width is 3.7 meters. It is agreed that wheeled vehicles pass at a speed of 30 kilometers per hour, and tracked vehicles pass at a speed of 5 kilometers per hour.