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Safety construction method for digging shield shaft and vertical shaft deep foundation pit

A construction method and shield well technology, which is applied in excavation, infrastructure engineering, artificial islands, etc., can solve problems such as leakage, pipeline breakage, and large joint angles, and achieve the effect of ensuring construction safety

Pending Publication Date: 2020-02-21
NO 1 ENG CO LTD OF CHINA RAILWAY 22ND CONSTR BUREAU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the additional stress is large and exceeds the tensile strength of the material, the pipeline will break and lose its working ability
In addition, the uneven settlement generated by the pipeline will make the joint angle too large. When it exceeds the joint angle limit, it will not be able to maintain a closed state and leak

Method used

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  • Safety construction method for digging shield shaft and vertical shaft deep foundation pit

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Embodiment Construction

[0040] Specific embodiments of the present invention will be described in detail below for further understanding of the present invention.

[0041] A safe construction method for deep foundation pit excavation of shield wells and vertical shafts, comprising the following steps:

[0042] 1. Crown beam and concrete support construction:

[0043] (1) Construction of No. 1 shield shaft crown beam and concrete support:

[0044] The construction of the pile top crown beam and retaining wall is carried out after the construction of the retaining piles is completed. After the construction of the surrounding protection piles is completed, the excavation of the earthwork is removed, and before the construction of the crown beam, the pile head is broken first, and the pile head is broken by the ring cutting method. Insufficient contact between steel bars and concrete provides convenience for pile head circumcision construction. After the pile head is broken, the construction of the cr...

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Abstract

The invention discloses a safety construction method for digging a shield shaft and vertical shaft deep foundation pit. The construction method includes the steps of arranging an earthwork and steel support operation team to enter a field to perform earthwork digging and steel support erecting after the constructing of fender posts, a precipitation well, crown beams and a first concrete support iscompleted, wherein earthwork digging, steel support erecting and intra-pile net concrete spraying are synchronously performed from top to bottom in the vertical direction, and the digging depth of each layer of earthwork in the vertical direction is 1.5 m; and performing net concrete spraying construction immediately after earthwork digging is started, and erecting steel supports in time and exerting prestress when the earthwork digging is performed to the position 0.5 m below each steel support. By means of the safety construction method for digging the shield shaft and vertical shaft deep foundation pit, the settlement of a soil body and the deformation of the foundation pit are strictly controlled in the construction process, the no-water operation in the construction process of a water-rich silty-fine sand layer is ensured, and construction safety is ensured.

Description

technical field [0001] The invention relates to the field of construction, in particular to a safe construction method for excavating deep foundation pits of shield wells and vertical shafts. Background technique [0002] The 06 contract section of civil engineering construction of Beijing Metro Line 17 is located in Chaoyang District, Beijing, from the intersection of Taiyanggong North Street and Taiyanggong Middle Road in the south to Wangjing West Station of Metro Line 15, roughly in a north-south direction. The bidding section includes one station and one section, the section from Taiyanggong Station to Wangjing West Station and Wangjing West Station. [0003] From the perspective of natural conditions (meteorological and hydrological, geological conditions, hydrological conditions, and engineering environment), the construction of this section has the following difficulties: (1) Ensuring the safety of surrounding pipelines during construction is the key point of this pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04E02D5/34E02D29/045E02D31/02
CPCE02D17/04E02D5/34E02D29/045E02D31/02
Inventor 王鑫平田作华王天武朱占魁廖友根王全利朱圣科何述吕程林吉星宇余亮高东周勇军
Owner NO 1 ENG CO LTD OF CHINA RAILWAY 22ND CONSTR BUREAU
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