Movable foundation pit internal supporting system and foundation pit construction method

Abstract

The invention provides a movable foundation pit internal supporting system. The movable foundation pit internal supporting system comprises enclosure purlins, supporting assemblies, lattice columns, pushing devices and a hoisting device. The enclosure purlins are arranged on the inner wall of a foundation pit, and every two adjacent enclosure purlins are detachably connected. The enclosure purlinsare driven by the hoisting device to move up and down along the inner wall of the foundation pit. Each supporting assembly is detachably connected between the two corresponding enclosure purlins andis provided with an accommodating opening. The lattice columns are vertically arranged in the foundation pit and are inserted into the accommodating openings. The supporting assemblies can be driven by the pushing devices to move in the axial direction of the lattice columns. According to the movable foundation pit internal supporting system, the enclosure purlins are driven by the hoisting deviceto move downwards along the inner wall of the foundation pit, and the supporting assemblies are driven by the pushing device to move downwards in the axial direction of the lattice columns, so that the enclosure purlins and the supporting assemblies are positioned and mounted again in the excavation layer so as to support the excavation layer, and accordingly, the safety and reliability of the foundation pit in the excavation process are ensured; and the movable foundation pit internal supporting system can be recycled, low in work amount and low in engineering cost. The invention further provides a foundation pit construction method.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a support system in a movable foundation pit and a construction method for the foundation pit. Background technique [0002] The function of the support system should ensure that the excavation of the foundation pit and the construction of the structure can be successfully completed according to the established plan under the condition of no water. It is necessary to maintain the stability of the side wall and limit the deformation of the soil layer to ensure the normal use of the existing buildings and facilities outside the pit. , but also keep the soil at the bottom of the pit stable to ensure that the soil at the bottom of the pit and the foundation are not damaged in terms of structure and function. [0003] At present, the deep foundation pit support is mostly based on the support system of single-use perfusion retaining piles or continuous walls and multiple-...

AI Technical Summary

Problems solved by technology

[0003] At present, the deep foundation pit support is mostly based on the support system of single-use perfusion retaining piles or continuous walls and multiple-use steel pipe inner supports. The support system is mostly cast-in-place reinforced concrete structures. After years of practice, it has been However, the reinforced concrete support system is one-time use and inconvenient to dismantle. The internal support system reduces the construction surface to a certain extent, which eventually leads to inconvenient excavation, long time consumption and high cost

[0004] For the situation where the soil where the foundation pit is located is soft and the soil layer is thick, and the enclosure pile or the underground diaphragm wall is too shallow to be inserted into the soil, it is easy to cause flowing soil or "kicking". The depth design is quite deep, the engineering volume is large, the construction difficulty is high, and the project cost is high

Therefore, the existing cast-in-place support system has the disadvantages of labor-intensive and time-consuming construction and dismantling, and the disadvantages of one-time use of materials

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