Subway transfer station deep foundation pit excavation support construction method

Abstract

The invention discloses a subway transfer station deep foundation pit excavation support construction method. A diaphragm wall enclosure structure is adopted, concrete supports and steel pipe combined supports are arranged, the inner side concrete supports form annular reinforced concrete supports, concrete support formworks adopt prefabricated reverse pressing block reverse pressing easy-to-dismantle formwork systems and shaped formwork systems, built-in segmental steel of waist beams and the diaphragm wall enclosure structure are combined in an anchoring-hanging mode to form a whole, and latticed columns adopt flexible anti-collision construction protection devices. The construction method comprises the steps of (1) construction preparation, (2) drainage in a field, (3) diaphragm wall construction, (4) concrete support and waist beam reinforcement cage binding, (5) concrete support and waist beam formwork erection, (6) concrete pouring and maintenance, (7) formwork removal and foundation pit excavation, and (8) construction of the next layer of concrete supports. According to the subway transfer station deep foundation pit excavation support construction method, the overall safety and stability of a foundation pit are guaranteed, the construction speed is greatly increased, and obvious social benefits and economic benefits are achieved.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a method for excavating and supporting a deep foundation pit of a subway transfer station. Background technique [0002] With the rapid development of urban rail transit, more and more cities have begun to build a rail transit network skeleton composed of multiple subway lines. The traffic must be transferred between lines. For hubs, the civil construction is difficult and the construction period is long. How to coordinate the excavation of foundation pits of different depths, especially the excavation and support of node positions, is the focus of the construction of the entire transfer station. [0003] In traditional transfer station foundation pit construction, horizontal isolation piles are set at the node positions, and stations with different depths are excavated in sections according to the principle of from shallow to deep. First, two-story stations are excavated, and th...

AI Technical Summary

Problems solved by technology

[0003] In traditional transfer station foundation pit construction, horizontal isolation piles are set at the node positions, and stations with different depths are excavated in sections according to the principle of from shallow to deep. First, two-story stations are excavated, and then three-story stations are excavated to remove the isolation piles. , this construction method has a long construction period, low efficiency, and many construction stages, which is unfavorable to the deformation control of the overall support system of the foundation pit

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