A method for overall removal of box girder bottom formwork

Abstract

A box girder bottom formwork integral demolition method is implemented in the steps of a, pre-casting formwork demolition holes: pre-casting 80-mm formwork demolition holes before a top plate is casted, making the top plate and embedded pipes of a bottom formwork are positioned at the same vertical position, and penetrating iron chains into the embedded pipes; 2, strengthening by adopting two-ended bolts: strengthening the bottom formwork of the box girder and the top plate by adopting the two-ended bolts after the top plate is casted; and 3, integrally demolishing the bottom formwork of the box girder: after the scaffold at the bottom of the box girder is demolished, an electric cradle transferring the bottom formwork onto a handcart at the lower part of the box girder through the iron chains, and repairing the formwork demolition holes after the bottom formwork is transported. The method has the advantages that 1, the formwork integrity segmentation demolition technology does not use large hoisting equipment, the electric cradle is simple and quick to operate, and the strengthening method is firm; 2, the construction efficiency is high, mechanical operation is realized, the material use cost is low, and the safety coefficient risk is low.

Description

technical field [0001] The invention relates to the technical field of box girder engineering in the field of engineering construction, in particular to a method for integrally removing a bottom formwork of a box girder. Background technique [0002] In the bridge construction of railways, urban roads and highways, the removal of the base plate formwork has always been the difficulty and focus of the project. In the previous demolition of the bottom formwork of the box girder project, the traditional method is to manually remove the formwork. Methods The efficiency of dismantling tall formwork or steel formwork is low, and the construction risk factor is high. At the same time, the dismantled formwork needs to be assembled when it is used again. schedule pressure and cost pressure. [0003] How to combine the integrity of the bottom formwork of the box girder, the mechanical characteristics, and the safety of dismantling are the severe tests facing the project. The inventi...

AI Technical Summary

Problems solved by technology

[0002] In the bridge construction of railways, urban roads and highways, the removal of the base plate formwork has always been the difficulty and focus of the project. In the previous demolition of the bottom formwork of the box girder project, the traditional method is to manually remove the formwork. Methods The efficiency of dismantling tall formwork or steel formwork is low, and the construction risk factor is high. At the same time, the dismantled formwork needs to be assembled when it is used again. schedule pressure and cost pressure

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