Waterproof construction method for open-cut semi-reverse construction method tunnel enclosing purlin node

Abstract

The invention relates to a waterproof construction method for an open-cut semi-reverse construction method tunnel enclosing purlin node. The waterproof construction method comprises the following steps of before a foundation pit is excavated, firstly constructing an enclosure structure, cutting a groove below the bottom of an enclosing purlin to construct a tripod, and then laying a first waterproof roll; constructing the enclosing purlin and a support connected with the enclosing purlin, and continuously excavating the foundation pit downwards after the enclosing purlin is constructed; in there-construction stage, constructing first plain concrete, and laying a second waterproof roll; constructing a first lining wall structure, and correspondingly constructing second plain concrete; andlaying a third waterproof roll, and constructing a second lining wall structure at the position, corresponding to the first lining wall, above the enclosing purlin. According to the open-cut semi-reverse construction method tunnel enclosing purlin node full-wrapping waterproof construction method, the connection between the enclosing purlin and the enclosure structure can be firm, meanwhile, the waterproof rolls are prevented from being pierced by connecting steel bars, and the waterproof effect is improved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a waterproof construction method for purlin joints of open-cut and semi-reversed tunnels, in particular to an all-inclusive waterproof construction method for purlin joints. Background technique [0002] At present, with the development of urban underground roads, tunnels are becoming more and more common. Existing open-cut tunnel projects include straight approach, reverse approach and semi-reverse approach. [0003] The semi-inverted method can use the purlin as a permanent structure, which can be dismantled after support, which not only saves the cost, but also ensures the safety of the construction. However, the connection between the purlin and the enclosure structure in the semi-reversed method destroys the integrity of the waterproofing, and the waterproofing effect has not been ideal. Therefore, in the prior art, how to solve the waterproof problem of the pu...

AI Technical Summary

Problems solved by technology

However, the connection between the purlin and the enclosure structure of the semi-reversed method has destroyed the integrity of the waterproofing, and the waterproofing effect has not been ideal.

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