Method for arranging water stops in box body jacking process

Abstract

A method for arranging water stops in a box body jacking process comprises the following steps: forming grooves in the middle of the front end surface of each box body and the inner side edge part of the box body respectively during prefabrication of the box body, and pre-burying one sides of water stops into concrete on the inner sides of the grooves; arranging plastic extrusion plates on the upper and lower surfaces of the outer parts of the water stops in the grooves, and arranging fair-faced concrete plates between the plastic extrusion plates and the top and bottom surfaces of the grooves; tightly sealing the outer side end ports of the grooves; setting up a template at the joint of every two box bodies and casting concrete. According to the method, two circles of grooves are respectively formed in the middle of the front end surface of each box body and the inner side edge part of the box body during prefabrication of the box body, meanwhile the water stops are pre-buried in the grooves, and the whole structure of each water stop is not exposed, so that the problem of damage caused by jacking and earth cutting operations of an excavator in the box body jacking process is avoided; besides, construction of the water stops is finished at one step during prefabrication of the box bodies, and after-treatment is not needed, so that time and labor can be saved; in addition, compared with the method of implanting after chiseling, the method provided by the invention shortens the construction period.

Description

technical field [0001] The invention belongs to the technical field of railway facility construction, and in particular relates to a method for arranging a water stop during the jacking process of a box body. Background technique [0002] With the rapid development of urban construction, the traffic volume is also increasing. When the existing railway crosses the highway, it is common practice to build a frame bridge under the existing railway to alleviate the traffic congestion caused by the railway line passing through the city. When some frame bridges cannot meet the traffic requirements due to their long service life or too small internal width, it is necessary to replace the old frame bridges with new ones. The commonly used replacement method at present is the jacking method. This method is to remove the old frame bridge and dig out the soil below the bridge while using a jack to lift the multi-section box that constitutes the main body of the frame bridge from one ...

AI Technical Summary

Problems solved by technology

However, there are the following problems in this waterstop setting method: during the jacking process of the box body, although the waterstop is covered with a clear water board, because it protrudes outside, the waterstop at the front end bottom plate and the edge corner of the box body The outside of the belt is still very susceptible to damage due to the impact of the excavator's jacking and excavation operations, thus losing the water-stop effect; in addition, after the next section of the box is jacked in place, the previous section needs to be closed when the front and rear sections are closed. The jack hole at the rear end of the box body is used to set the jacking jack, and then the outer end of the water stop belt on the front end of the latter section of the box body is pressed against the rear end surface of the previous section of the box body, and then the two sections of the box body Formwork is built and concrete is poured at the connection, so that the outside of the waterstop at the front end of the latter section of the box is pre-embedded into the concrete at the rear end of the previous section of box, thus forming a waterproof structure

It is easier to damage the water stop at the front end of the last section of the box after the box is jacked in place, and the damage area is large and difficult to remedy

In addition, if the waterstop is not pre-embedded in the concrete at the front end of the box body, after the box body is jacked into place, it is necessary to organize personnel to carry out chisel removal operations separately, which is not only labor-intensive and the amount of work is large, but also the construction period is bound to be extended

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