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Shield receiving well foundation pit excavation and supporting non-precipitation construction method

A construction method and technology for receiving wells, which are used in excavation, infrastructure engineering, sheet pile walls, etc., can solve problems such as no precipitation, and achieve the effects of reducing impact, ensuring dry tank operation environment, and ensuring safety.

Active Publication Date: 2020-08-21
RANKEN RAILWAY CONSTR GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is the influence of groundwater inside and outside the foundation pit on the excavation construction of the foundation pit during the excavation process of the foundation pit of the shield receiving well. The construction method solves the problem that no precipitation is required during the excavation and support construction of the foundation pit of the shield receiving shaft

Method used

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  • Shield receiving well foundation pit excavation and supporting non-precipitation construction method
  • Shield receiving well foundation pit excavation and supporting non-precipitation construction method
  • Shield receiving well foundation pit excavation and supporting non-precipitation construction method

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Embodiment 1

[0028] This embodiment is the excavation construction plan of the shield receiving shaft in the south section of Qinghe Station of the branch line of Line 19. The branch line of Line 19 is a reserved line at the north and south ends of Qinghe Station. The reserved section on the south side is constructed by shield tunneling and underground excavation. The section is set up with a shield tunnel in the southeast quadrant of the intersection of Jingxin Expressway and Xiaoying West Road. The site is currently an open space, about 53.1m away from the nearest point of Metro Line 13 on the west side, and 20.3m away from the drop-down trough of the auxiliary road of Xiaoying West Road on the north side, and there is no pipeline in the site. The shield receiving shaft of the branch line of Line 19 is located in the southwest quadrant of the intersection of North Fifth Ring Road and Maofang Road, and the current situation is mainly green land. There are no pipelines on site. The design...

Embodiment 2

[0043] This embodiment 2 is an improvement made on the basis of embodiment 1. It is another embodiment of the present invention to construct the water-stop curtain at the bottom of the foundation pit first, then to construct the bored piles on the side wall of the foundation pit, and then to construct the water-stop curtain on the side wall of the foundation pit. The specific plan is as follows:

[0044] A construction method for excavating and supporting a foundation pit of a shield receiving well without precipitation, comprising the following steps: S1: performing grouting on the bottom of the foundation pit of a shield receiving well to stop water to form a water-stop curtain at the bottom of the foundation pit; S2: According to the boundary line direction of the foundation pit excavation area of ​​the receiving well of the shield machine, a plurality of bored piles are placed according to a given interval, and the multiple bored piles are distributed in a circular array t...

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Abstract

The invention discloses a shield receiving well foundation pit excavation and supporting non-precipitation construction method. The method includes the steps that multiple bored cast-in-place piles distributed in an annular array are arranged in a shield receiving well foundation pit excavation region, and the side wall of a shield receiving well foundation pit is defined by the bored cast-in-place piles; the bottom face of the foundation pit and the inner side and the outer side of the side wall of the foundation pit are subjected to grouting water stop, a bottom water stop curtain, an innerwater stop curtain and an outer water stop curtain are formed, the water stop curtains are integrally formed, and a gap groove is formed between the water stop curtains on the inner side and the outerside of the side wall of the foundation pit; water in the foundation pit is extracted away, part of water in the gap groove is extracted, the horizontal plane in the gap groove is located at the position between the underground horizontal plane and the bottom face of the foundation pit, and then a crown beam and a ground water retaining wall are arranged; and the foundation pit is excavated and driven from top to bottom layer by layer, and multiple supports are arranged on all the layers for supporting. By means of the method, the problem about safety construction under the non-precipitationcondition in the shield receiving well foundation pit excavation and supporting construction process is solved.

Description

technical field [0001] The invention relates to the field of foundation pit construction, in particular to a construction method for excavating and supporting a foundation pit of a shield receiving well without precipitation. Background technique [0002] For the current rail transit projects in major cities in China, with the encryption of the subway network and the continuous improvement of the surrounding environmental protection requirements, the requirements for construction technology are also getting higher and higher. During the process, it is often necessary to dewater the groundwater in the foundation pit to ensure the smooth progress of the foundation pit excavation. Foundation pits need to withstand huge water pressure during excavation. Two methods are mainly used in the prior art. One method is that during the construction of the foundation pit, the dewatering is carried out synchronously and throughout the entire construction process. This method is time-con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02E02D17/04E02D5/34E02D19/18
CPCE02D17/02E02D17/04E02D5/34E02D19/18
Inventor 胡运春朱立华贺培培钟雪
Owner RANKEN RAILWAY CONSTR GROUP
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