Gapless Beam Dropping Method and Its Adjustable Height-adjusting Device after the Bridge is Highly Raised

Abstract

The invention discloses a method for conducting gapless bridge dropping after bridge is lifted for large height and a height adjusting device applied to the method. After the bridge is jacked, the height adjusting device is utilized to support an upper structure of the bridge to achieve gapless bridge dropping of the bridge even no bridge dropping, then a jacking mechanism is disassembled, and a pouring pier is heightened to bury the height adjusting device into a pouring layer. The height adjusting mechanism comprises a vertical support structure, one end of the vertical support structure is connected with the bottom face of a support platform, the other end of the vertical support structure is connected with a base used for adjusting the height of the vertical support structure, and the base is located on the pier. The method and the device have the advantages of being good in adaptability, controllable in safety, high in construction accuracy, simple in structure, good in operability, good in economy, wide in application prospects and the like.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a gapless beam drop method after a bridge is raised to a large height and an adjustable height device applied in the method. Background technique [0002] With the rapid development of the economy and society, due to insufficient bridge deck elevation and insufficient clearance under the bridge, some bridges in use usually use large-scale counterforce supports to lift the bridge to a large height ( 50 cm or more) to ensure the safe and complete continued use of the bridge structure. After the bridge is raised to the design elevation, bars are planted on the pier abutment, and steel mesh is arranged. The original bridge pier top is first poured to connect the high concrete, and then the support is installed on the top of the high concrete, and finally through multi-point jacking or multi-point lifting Realize the falling beam (the force of the bridge falling on the sup...

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Problems solved by technology

[0004] 2. It is difficult to ensure the synchronization and stability of the existing multi-point jacking or multi-point lifting equipment during the beam falling process, which usually causes a large Additional internal force and deformation, even cracking

[0005] 3. After the bridge is jacked up or raised to the design elevation, it will take at least 15 days (the time taken for the steel formwork installation and concrete pouring and maintenance) before the beam drop construction can be carried out. During this process, the bridge multi-point jacking or multi-point lifting equipment It must be kept in a static working state and cannot be dismantled. This kind of static working state with continuous force is generally much longer than the dynamic working time of normal jacking, which occupies most of the equipment usage cost and is very uneconomical.

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