Deep foundation pit side wall waterproof structure of water-rich stratum metro station and construction method

Abstract

The invention discloses a deep foundation pit side wall waterproof structure of a water-rich stratum metro station. The structure comprises an envelope structure layer, a backfill soil layer, a waterproof coil layer and a main body structure side wall layer arranged in sequence from outside to inside. The invention further discloses a construction method of the deep foundation pit side wall waterproof structure of the water-rich stratum metro station. Firstly, an outline is designed for a foundation pit to flatly move to the outer side; then, the construction is prepared; an envelope structure is constructed again; the foundation pit is excavated; a main body structure is cast; and finally, the side wall waterproof construction is performed. The deep foundation pit side wall waterproof structure of the water-rich stratum metro station and the construction method are suitable for the foundation pit waterproof construction under various geological conditions; the waterproof effect of the metro station deep foundation pit under the water-rich stratum geological conditions is more obvious, so that the damage to paved waterproof coils by binding reinforcements and casting concrete in construction of the main body structure is prevented; and the structure is low in construction difficulty, reduces the adjustment complexity of staff, machinery and construction methods, and reduces the construction cost.

Description

technical field [0001] The invention relates to the technical field of underground engineering design and construction, in particular to a water-rich stratum subway station deep foundation pit side wall waterproof construction technology. Background technique [0002] In the deep foundation pit projects of subway stations in water-rich strata, the groundwater depth is often shallow and the water volume is relatively abundant. Once the waterproof system of the foundation pit leaks, it will seriously affect the stability of the foundation pit and the safety of surrounding buildings. The existing waterproof construction technology for deep foundation pits of subway stations is still not very mature, and there are still some problems and deficiencies in the waterproof construction technology. [0003] The existing waterproof construction technology for the side wall of the deep foundation pit of the subway station is to first apply a 20cm thick cement mortar leveling layer on th...

AI Technical Summary

Problems solved by technology

However, in the construction technology of construction joints and induced joints, the waterproof membrane is often not in close contact with the concrete, resulting in the formation of air bubbles or gaps; As a result, the contact between the waterproof membrane and the concrete is not dense, resulting in the formation of air bubbles

[0004] The existing foundation pit waterproofing technology can be applied with a certain thickness of fine stone concrete protective layer to protect the waterproofing membrane after laying the baseboard waterproofing membrane, so as to avoid damage to the waterproofing membrane during operations such as binding the baseplate to steel bars. The protective layer cannot be applied on the outside of the side wall of the pit, which means that the existing waterproof construction technology for the side wall of the foundation pit cannot avoid the damage to the waterproof membrane caused by operations such as binding the steel bars on the bottom plate when constructing the main structure

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