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Method and supporting structure for constructing foundation pit above existing facility

A technology of support structure and enclosure structure, which is applied in the direction of infrastructure engineering, excavation, construction, etc., can solve the problems that the enclosure structure cannot be lengthened with confined water, the tunnel affects the safety of the tunnel itself, and the stability of the confined water is insufficient. Achieve good water blocking effect, ensure structural safety, and good protective effect

Pending Publication Date: 2020-10-16
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Shield tunnel is a common structural form of urban rail transit. With the vigorous development of rail transit, it is inevitable that the foundation pit project will be constructed directly above the shield tunnel, which will have a great impact on the safety of the tunnel, especially in the rich Excavating foundation pits in water-sand layers and confined water aquifers often encounter situations where the stability of confined water is insufficient
Under normal circumstances, when the stability of the confined water in the foundation pit project is insufficient, the confined water can be reduced or the enclosure structure is used to isolate the confined water to meet the stability requirements of the confined water inrush. It will cause large deformation of the tunnel and affect the safety of the tunnel itself, and because there is a tunnel under the foundation pit, the enclosure structure cannot be lengthened to isolate the confined water

Method used

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  • Method and supporting structure for constructing foundation pit above existing facility
  • Method and supporting structure for constructing foundation pit above existing facility
  • Method and supporting structure for constructing foundation pit above existing facility

Examples

Experimental program
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Embodiment 1

[0032] like Figure 1-Figure 3 , an embodiment of the present invention provides a method for constructing a foundation pit above existing facilities, including:

[0033] S1, constructing a portal reinforcement 3, and the portal reinforcement 3 encloses the existing facility 1;

[0034] S2, implement the originating well 51 and the receiving well 52;

[0035] S3, the construction of the pipe curtain 4 is carried out through the originating shaft 51 and the receiving shaft 52, wherein the pipe curtain 4 is formed in the top beam 31 of the portal reinforcement 3;

[0036] S4, backfill the originating shaft 51 and the receiving shaft 52, and carry out the construction of the foundation pit 2.

[0037] The above-mentioned door-type reinforcement body 3 is a door-type structure, that is, the reinforcement enclosure is carried out on the left and right sides of the existing facility 1 and above the existing facility 1; the existing engineering reinforcement body 3 is suitable for ...

Embodiment 2

[0050] like Figure 1-Figure 3 , an embodiment of the present invention provides a support structure for constructing a foundation pit above existing facilities, including:

[0051] A portal reinforcement 3, the portal reinforcement 3 enclosing the existing facility 1;

[0052] A pipe curtain 4, the pipe curtain 4 is formed in the top beam 31 of the portal reinforcement 3.

[0053] The above-mentioned door-type reinforcement body 3 is a door-type structure, that is, the reinforcement enclosure is carried out on the left and right sides of the existing facility 1 and above the existing facility 1; the existing engineering reinforcement body 3 is suitable for this embodiment, preferably using Cement-based reinforcements, such as mixing pile reinforcements, grouting reinforcements, or MJS reinforcements, etc., the specific structure will not be repeated here. In one of the embodiments, the above-mentioned existing facility 1 is an underground tunnel 1, and the above-mentioned d...

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Abstract

The invention relates to a method for constructing a foundation pit above an existing facility. The method for constructing the foundation pit above the existing facility includes the steps that a portal reinforcement body is applied, and the portal reinforcement body defines the existing facility inside; a starting well and a receiving well are applied; pipe curtain construction is carried out through the starting well and the receiving well, wherein a pipe curtain is formed in a top beam of the portal reinforcement body; and the starting well and the receiving well are backfilled for foundation pit construction. In addition, a supporting structure for constructing the foundation pit above the existing facility is provided accordingly. According to the method and the supporting structurefor constructing the foundation pit above the existing facility, by applying the reinforcement body around the existing facility for reinforcement and applying the pipe curtain in the top beam of thereinforcement body, the pipe curtain and the reinforcement body integrally resist water pressure around the existing facility and restrain deformation of the existing facility, the better protection effect and water blocking effect can be obtained, and the safety of foundation pit excavation and the structural safety of the existing facility self can be fully ensured; and the method is further suitable for engineering construction under the condition of water-bearing sand layers and the like, and especially, the construction safety performance of the foundation pit excavation above an underground tunnel and the other projects is well guaranteed.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a method for constructing a foundation pit above existing facilities and a supporting structure. Background technique [0002] Shield tunnel is a common structural form of urban rail transit. With the rapid development of rail transit, it is inevitable that foundation pit engineering will be constructed directly above the shield tunnel, which will have a great impact on the safety of the tunnel, especially in Fuzhou. Excavating foundation pits in water-sand layers and confined water aquifers often encounters insufficient stability of confined water. Under normal circumstances, when the stability of the confined water in the foundation pit project is insufficient, the confined water can be reduced by reducing the confined water or the enclosure structure is used to isolate the confined water to meet the stability requirements of the confined water inrush. It...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D17/04
CPCE02D17/02E02D17/04
Inventor 李文彪赵星王金龙吕延豪潘清豆海涛游龙飞蔡兴瑞刁维科许伟宏
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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