Construction method for anti-uprush of ultra-deep foundation pit

Abstract

The invention relates to a construction method for anti-uprush of an ultra-deep foundation pit. The bottom of the foundation pit to be excavated is close to a confined aquifer, and the construction method comprises the steps of setting a underground diaphragm wall around the area of the foundation pit is to be excavated; pouring a water-retaining reinforcement layer at the bottom position of the underground diaphragm wall through using MJS, and the periphery of the water-retaining reinforcement layer is adhered to the underground diaphragm wall; pouring a depressurization reinforcement layer at the bottom position of the foundation pit to be excavated above the water-retaining reinforcement layer by using MJS, and the periphery of the depressurization reinforcement layer is adhered to theunderground diaphragm wall; and excavating the foundation pit and supporting a support structure correspondingly. The construction method provided by the invention effectively solves the problem of uprush hidden danger of the confined aquifer when excavating the ultra-deep foundation pit, and has little influence on the surrounding environment during construction, does not cause settlement of surrounding buildings, and can ensure construction quality and construction efficiency.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a construction method for preventing surges in ultra-deep foundation pits. Background technique [0002] With the rapid development of cities, in order to meet the needs of human life, more and more urban underground space resources are being developed and utilized, especially the construction of underground rail transit is in full swing in major cities. When there are buildings with extremely high settlement control requirements around the pit, it is impossible to carry out technological operations such as confined water precipitation and high-pressure rotary jet reinforcement that may cause serious deformation of the surrounding environment of the foundation pit. However, the maximum excavation depth of the foundation pit reaches the confined water layer Below, under the premise of not adopting confined water control, the safety factor of anti-surge at the bottom of the fou...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the prior art, to provide a construction method for anti-inrush of ultra-deep foundation pits, which solves the problem of hidden dangers of pressurized water inrush during excavation of ultra-deep foundation pits, and during construction The impact on the surrounding environment is small, it will not cause the settlement of surrounding buildings, and it can ensure the construction quality and construction efficiency

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