Construction method for underground diaphragm wall under condition of irremovable underground obstacle

Abstract

The invention relates to a construction method for an underground diaphragm wall under the condition of an irremovable underground obstacle. The construction method comprises the following steps of making a deep guide wall to the bottom of a pipe gallery, and protecting the pipe gallery through protective steel plates; separately forming grooves along the protective steel plates on the both sidesof the pipe gallery through a trenching machine to a set position below the bottom elevation of the pipe gallery; and performing underwater towing and translation on a plurality of reinforcement cagesthrough a crane, so that all the reinforcement cages are horizontally moved to the specified position below the pipe gallery. The pipe gallery is completely wrapped and protected through the protective steel plates, and the situation that a grab bucket collides with the pipe gallery structure by mistake during grooving is avoided; through underwater towing and translation , the breakdown and damage risk caused by uneven stress of the reinforcement cages in the translation process can be avoided, and it is ensured the reinforcement cages are horizontally moved to the specified position below the pipe gallery; and the overall rigidity of a wall and the stress safety of the foundation pit below the pipe gallery are ensured.

Description

technical field [0001] The invention relates to the technical field of underground diaphragm wall construction, in particular to an underground diaphragm wall construction method under the condition of unremovable underground obstacles. Background technique [0002] In recent years, with the rapid development of urban rail transit, the underground diaphragm wall has rapidly become the deep foundation pit of subway stations due to its advantages such as less land occupation, high work efficiency, high rigidity, reliable quality, strong geological adaptability and little impact on the surrounding environment. main form of support. [0003] The construction of the underground diaphragm wall is mainly divided into three parts: trough formation, reinforcement cage installation, and concrete pouring. Under normal circumstances, all underground pipelines and other obstacles in the construction area should be relocated and dealt with before construction, otherwise the trenching con...

AI Technical Summary

Problems solved by technology

The original construction method of the underground diaphragm wall at the position of the pipeline, when faced with similar obstacles such as the pipe gallery, the following problems occurred: the buried depth of the pipe gallery is relatively deep, and when the groove is formed, it is operated underwater, and it may encounter the pipe gallery and cause internal The risk of pipeline damage; the section size of the pipe gallery is large, and the hydraulic grab is vertically grooved for construction, and the soil directly below is difficult to excavate; the "one groove and two cages" method, there is no steel bar directly below the pipe gallery, and the force on the wall is affected. The rigidity is not enough; the long-term construction and the disturbance of the soil under the pipe gallery cause a great risk to the safety of the pipeline; the economic loss caused by the suspension of the project caused by the influence of the pipeline and the inability to construct is very large

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