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Method for preventing existing tunnel from floating in unloading earthwork process directly above tunnel

A technology directly above the existing tunnel, which is applied in the direction of foundation structure engineering, sheet pile walls, protective devices, etc., can solve the problems of existing tunnels such as floating, achieve the effect of strengthening the soil, improving stability, and simple construction methods

Active Publication Date: 2020-01-24
ANHUI URBAN CONSTR DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a method for preventing the existing tunnel from floating up during unloading of earth directly above it, so as to solve the problem of unloading the soil on the surface or excavating the foundation pit in the prior art. There are technical issues with the tunnel going up

Method used

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  • Method for preventing existing tunnel from floating in unloading earthwork process directly above tunnel
  • Method for preventing existing tunnel from floating in unloading earthwork process directly above tunnel
  • Method for preventing existing tunnel from floating in unloading earthwork process directly above tunnel

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Embodiment 1

[0033] In this embodiment, a method for preventing the existing tunnel from floating up during unloading of earthwork directly above it is provided.

[0034] This embodiment is aimed at removing the soil mound on the surface directly above the tunnel to avoid weathering of the soil mound and raising dust, and at the same time construct other buildings on the surface to beautify the urban environment.

[0035] The method includes the following steps:

[0036] Step 1. Determine the range and depth of earthwork that needs to be unloaded right above the existing tunnel;

[0037] In this embodiment, first confirm the range and thickness of the earthwork directly above the tunnel in the mound, that is, confirm the range that can affect the uplift of the tunnel;

[0038] Step 2, divide the earthwork that needs to be unloaded into multiple unloading layers from top to bottom;

[0039] In this embodiment, after confirming the scope of the soil mound that can affect the floating of th...

Embodiment 2

[0051] This embodiment is aimed at excavating the foundation pit downwards at the surface directly above the existing tunnel, and constructing the corresponding buildings, that is, the soil with a certain thickness between the surface and the existing tunnel is removed, and then the existing There is a certain amount of unloading in the tunnel. Therefore, in order to prevent the existing tunnel from floating up during the unloading process, this embodiment is implemented according to the following method.

[0052] The method includes the following steps:

[0053] Step 1. Determine the range and depth of earthwork that needs to be unloaded right above the existing tunnel;

[0054]In this embodiment, first confirm the range and thickness of the earthwork directly above the tunnel in the foundation pit, that is, confirm the range that can affect the buoyancy of the tunnel;

[0055] Step 2, divide the earthwork that needs to be unloaded into multiple unloading layers from top to ...

Embodiment 3

[0068] In this embodiment, the construction object is a combination of the earthwork on the corresponding surface directly above the existing tunnel and the earthwork corresponding to the excavation of the foundation pit directly above the existing tunnel.

[0069] The construction method is the combination of Embodiments 1 and 2, that is, the processed soil is the earthwork corresponding to the earthwork on the surface and the foundation pit, and the rest are the same.

[0070] Further, in Examples 1-3, in order to save the material of steel pipe piles and reduce the damage to the original soil, the steel pipe piles are specifically composed of steel pipes of two lengths, and the two kinds of steel pipes are pressed at intervals. into the corresponding unloading layer.

[0071] Through the above-mentioned arrangement, the steel pipe piles are arranged in a staggered manner, and while saving costs, the soil body can be effectively reinforced to prevent the above and further pr...

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Abstract

The invention discloses a method for preventing an existing tunnel from floating in unloading earthwork process directly above the tunnel, and relates to a foundation pit construction method. The method comprises the following steps that the range and depth of the earthwork need to be unloaded directly above the tunnel are determined, the earthwork that needs to be unloaded is divided into multiple unloading layers from top to bottom, steel pipe piles for preventing floating deformation on the corresponding unloading layer are uniformly mounted on the unloading layer of the topmost layer, thetop of each steel pipe pile is flush with the horizontal plane where the top of the corresponding unloading layer is located, multiple unloading layers are excavated in sequence from top to bottom, the exposed steel pipe piles are pressed down in the mining process, so that the top of the steel pipe piles are level with the top of the unloading layer to be excavated under the lower layer, excavation is continued until the top of all the steel pipe piles are flush with the bottom of the unloading layer needing to be unloaded, and the bottom end of the steel pipe piles located directly above thetunnel are kept safe from the top of the existing tunnel. According to the method for preventing the existing tunnel from floating, the defect that the tunnel floats upwards during unloading can be effectively prevented, and the operation is simple.

Description

technical field [0001] The invention relates to a foundation pit excavation method, in particular to a method capable of preventing the tunnel from floating up when the unloading operation is performed above the existing tunnel. Background technique [0002] The subway is the main way of public transportation in major cities now, and it has many advantages such as high stability, punctuality, and safety. The tunnel is the life channel for the subway to transport passengers quickly. [0003] The construction and later maintenance of tunnels require a lot of manpower and material resources. Tunnel floating is a common problem in its construction process. Therefore, the influencing factors will be fully considered during the construction process to avoid various problems caused by floating after the completion of later construction. [0004] Therefore, after the completion of the tunnel construction, the factors affecting the uplift of the tunnel are basically resolved, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D31/12E02D27/26E02D5/28
CPCE02D5/285E02D27/26E02D31/12
Inventor 束冬青蔡敏孟玉单灿灿张龙飞李慧明王宗德高程东孙昌兴郑永磊
Owner ANHUI URBAN CONSTR DESIGN & RES INST
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