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Method for preventing upward floating of existing tunnel during unloading of earthworks

A technology for existing tunnels and earthwork, applied in protection devices, buildings, infrastructure projects, etc., can solve problems such as floating of existing tunnels, and achieve the effect of overcoming floating, convenient operation and overall simplicity

Inactive 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 upward floating of existing tunnel during unloading of earthworks
  • Method for preventing upward floating of existing tunnel during unloading of earthworks
  • Method for preventing upward floating of existing tunnel during unloading of earthworks

Examples

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Embodiment 1

[0030] to combine Figure 1-3 , in this embodiment, a method for preventing the existing tunnel from floating up when earthwork is unloaded is provided.

[0031] 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.

[0032] The method includes the following steps:

[0033] Step 1. Determine the range and depth of earthwork that needs to be unloaded right above the existing tunnel;

[0034] In this embodiment, first confirm the range and depth of the earthwork that needs to be unloaded, and then determine the range and depth of the earthwork that needs to be unloaded directly above the existing tunnel;

[0035] Then go to step 2;

[0036] Step 2. Excavate the soil on both sides of the existing tunnel and at the periphery of the earthwork that needs to be unloaded to the depth determine...

Embodiment 2

[0049] Please refer to Figure 4-6 , the purpose of this embodiment is to excavate the foundation pit from the surface directly above the existing tunnel, and construct the corresponding buildings, that is, the soil with a certain thickness between the surface and the existing tunnel is removed, and then the existing tunnel is constructed. There is a certain amount of unloading in some tunnels. Therefore, in order to prevent the existing tunnels from floating up during the unloading process, this embodiment proceeds according to the following method.

[0050] The method includes the following steps:

[0051] Step 1. Determine the range and depth of earthwork that needs to be unloaded right above the existing tunnel;

[0052] In this embodiment, first confirm the scope and depth of all unloaded earthworks that need to be excavated as a whole, and then determine the scope and depth of the unloaded earthworks that are directly above the existing tunnel in the foundation pit;

...

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] In Embodiment 1-3, the present invention uses the need to unload the earthwork that is reserved directly above the existing tunnel and can have an impact on the existing tunnel, and then carries out pile construction on both sides of the need to unload the earthwork, and then needs to be unloaded. Unload the bottom of the earthwork for pipe jacking construction, and then construct the top beams connecting the piles on both sides to form bench piles that are pressed directly above the existing tunnel. F...

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Abstract

The invention discloses a method for preventing upward floating of an existing tunnel during unloading of earthworks, and relates to a foundation pit construction method. The method includes the stepsthat the range and depth of the earthworks needing to be unloaded above the existing tunnel are determined, soil bodies on the two sides of the existing tunnel and located at the peripheries of the earthworks needing to be unloaded are excavated till the depth determined in the step 1, two construction areas distributed on the two sides of the existing tunnel are formed, pile bodies are constructed in the two construction areas correspondingly, pipe-jacking construction is conducted on the bottom of the earthworks, needing to be unloaded, between the two construction areas on one of the two construction areas, a pipe-jacking channel is formed, jacking beams are constructed in the pipe-jacking channel and connected with the pile bodies constructed in the step 3 to form bench piles crossingthe existing tunnel, and after the bench piles are formed, the earthworks needing to be unloaded are excavated. According to the method provided by the invention, the defect of upward floating of theexisting tunnel during unloading can be effectively prevented, and operation is easy.

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): E02D31/12E02D27/26
CPCE02D27/26E02D31/12
Inventor 蔡敏束冬青孟玉孙昌兴王春单灿灿高小平钱礼平郑永磊陈卫东
Owner ANHUI URBAN CONSTR DESIGN & RES INST
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