Construction process for prestress support in deep foundation pit

Abstract

The invention relates to a construction process for a prestress support in a deep foundation pit. The construction process specifically comprises the following steps: (1) cleaning a site and constructing and paying off; (2) construction preparation; and (3) constructing enclosure engineering: a prestress is applied in an enclosure mode by means of triaxial stirring pile water sealing, a cast-in-situ bored pile, a biaxial stirring pile, a stiffening anchor rod pile, anchor spraying and a semi-detached waist rail, wherein the step (3) specifically comprises the following steps: sequentially joining and alternately performing triaxial stirring pile water sealing, cast-in-situ bored pile enclosing and biaxial stirring pile matched with earthwork excavation and transportation; firstly, performing construction of the cast-in-situ bored pile, wherein two stirring pile drivers move in opposite directions to reduce construction cold joints, and 3-5 days after construction of the biaxial stirring piles, following up and inputting the mixture into a drilling machine for performing construction of the cast-in-situ bored pile; after construction of the cast-in-situ bored pile, excavating earthwork, and then continuously excavating earthwork after constructing the stiffening anchor rod pile, and performing anchor spraying and the semi-detached waist rail; and repeating the construction flowsin the steps till integral construction of a to-be-constructed super deep foundation pit is finished. The construction process efficiency is high, the safety of the foundation pit is ensured, and theconstruction period is shortened.

Description

technical field [0001] The invention relates to the technical field of building construction, to the technical field of deep foundation pit excavation construction, and in particular to a construction technique for prestressed support in deep foundation pits. Background technique [0002] With the development of economy and society, human beings have more and more demands on the construction of high-rise buildings and long-span bridges. Deep development. Ultra-tall buildings will inevitably require ultra-deep foundation pits as a guarantee. [0003] At present, the support engineering of deep foundation pit has become an important sub-item of high-rise building construction engineering. Since the earthwork of the foundation pit has not been excavated, the foundation pit support construction is developed in a completely concealed and semi-concealed state. Technology is heavily and widely studied in the engineering community. Especially in the construction in the central ar...

AI Technical Summary

Problems solved by technology

[0005] 1) It is prone to collapse and deformation of the excavated foundation pit;

[0006] 2) When digging a deep foundation pit, there are often potential safety hazards in adjacent buildings, underground structures and pipelines;

[0007] 3) The traditional underground diaphragm wall construction method requires large investment, low safety factor, and high construction noise. It require

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