Construction method of underground passage orthogonally and closely attached to underground commercial street bottom plate

Abstract

The invention provides a construction method of an underground passage orthogonally and closely attached to a bottom plate of an underground commercial street, which comprises the following steps of: horizontally excavating upper steps on left and right lines of the underground passage, and supporting by a vertical frame; pouring an underpinning beam, an underpass section top plate and an upper half section side wall, and connecting with the existing interval structure of the existing underground passage; a plurality of jacks are arranged between the underpinning beam and the inverted arch of the upper step, and existing pile foundations of the underground passage are cut off one by one; sequentially constructing, excavating a lower step and constructing a lower step structure; and a waterproof layer is wrapped outside the construction structure, and gaps around the underpass section structure are backfilled through plain concrete. Pile foundation underpinning is carried out immediately after an upper step structure, namely, an underpinning beam, a bottom penetrating section top plate and an upper half section side wall, is poured. Compared with pile foundation underpinning of similar projects, due to the fact that only the upper structure is constructed, the construction period can be greatly shortened, under the protection of the existing upper structure, the construction speed of the lower step can be greatly increased, and the construction period, the manufacturing cost, the safety and the like can be well controlled.

Description

technical field [0001] The invention relates to the technical field of underground passage construction, in particular to a construction method of an underground passage which is orthogonally and closely adhered to the bottom plate of an underground commercial street. Background technique [0002] In recent years, with the further development and utilization of urban underground space, in order to strengthen the connection between different underground spaces, it is necessary to add new underground connecting passages between new or existing underground spaces. More and more cases where underground passages are built in close proximity to existing underground structures. In many cases, because the existing structure is already in operation and functioning, it cannot be temporarily closed. Therefore, during the construction of the new underground structure, it is necessary to ensure not only the structural safety of the existing underground structure, but also the safe operat...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an underpass construction method that is orthogonally attached to the bottom plate of the underground commercial street, aiming to solve the problem that the underpinning of pile foundations in the prior art usually occurs after the overall structure of the underpass is constructed. technical issues that are difficult to control such as construction period, cost, and safety

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