Deep foundation pit concrete supporting structure with hoisting holes being pre-formed and construction method thereof

Abstract

The invention discloses a deep foundation pit concrete supporting structure with hoisting holes being pre-formed and a construction method thereof. The concrete supporting structure comprises a concrete waist beam and concrete supports which are mutually connected; the concrete waist beam is provided with a plurality of waist beam pre-cutting surfaces; the multiple waist beam pre-cutting surfaces divide the concrete waist beam into a plurality of waist beam pre-cutting sections; and a waist beam hoisting hole pipe is arranged in each waist beam pre-cutting section in a penetrating and pre-buried mode. The concrete supporting structure can guarantee hoisting safety of concrete supporting blocks. The construction method of the concrete supporting structure comprises the steps that structural steel bars of the concrete waist beam and the concrete supports are bound; the waist beam hoisting hole pipes and supporting hoisting hole pipes are arranged in the concrete waist beam and the concrete supports correspondingly, and the waist beam hoisting hole pipes and the supporting hoisting hole pipes are bound on the structural steel bars through binding wires; and a formwork is erected, the concrete waist beam and the concrete supports are poured, and the formwork is removed after pouring The construction method is simple and feasible, and the situation that in concrete pouring, the waist beam hoisting hole pipes and the supporting hoisting hole pipes are dislocated can be avoided.

Description

technical field [0001] The invention relates to the technical field of deep foundation pit construction, in particular to a concrete support structure for a deep foundation pit with preset hoisting holes and a construction method thereof. Background technique [0002] For urban subway station foundation pits with large construction area and large excavation depth, the supporting structure is usually partly or even fully supported by concrete to maintain the stability of the foundation pit. In recent years, wire saws have been used more and more widely in the demolition of concrete supports. Usually, wire saws are used to cut concrete supports into concrete blocks of 8t to 10t, and the concrete blocks are transported to designated locations by forklifts, and then hoisted by cranes. Out of the foundation pit and transported away. [0003] Typically, the length of the cut concrete support is around 2.5m, sometimes even shorter. Taking a subway station as an example, the desig...

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Problems solved by technology

[0004] Due to the short concrete blocks, if the steel wire ropes are not properly bound during the hoisting process, it is prone to tilting or even falling, which is extremely risky; moreover, the construction procedures of the subway station overlap, the working surfaces interfere with each other, and there are many obstacles during the hoisting process (inside the foundation pit) Usually there are multiple supports), which increases the risk; in addition, the edges and corners of the concrete support wear the steel wire rope greatly, which shortens the service life of the steel wire rope and increases the risk of hoisting

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