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Primary supporting method for underground excavation tunnel of underpass airport terminal

A technology for initial support and terminal building, used in tunnels, tunnel linings, underground chambers, etc., can solve problems such as the collapse of vaults, strengthen the stratum, increase the joint support capacity, and excavate the lower soil. stable effect

Inactive Publication Date: 2020-10-02
RANKEN RAILWAY CONSTR GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an initial support method for a tunnel excavated under an airport terminal, so as to solve the problem in the prior art that the excavation of the lower soil easily leads to the collapse of the vault

Method used

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  • Primary supporting method for underground excavation tunnel of underpass airport terminal
  • Primary supporting method for underground excavation tunnel of underpass airport terminal
  • Primary supporting method for underground excavation tunnel of underpass airport terminal

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Embodiment 1

[0041] Such as figure 1 ,Such as figure 2 and as image 3 Shown, the present invention is a kind of initial support method of the underground excavation tunnel that passes through the airport terminal building, comprises the following steps:

[0042] S1: Drilling and grouting of advanced small catheters:

[0043] The specific construction sequence of step S1 includes: sealing the working face, drilling, installing small conduits, grouting and effect inspection;

[0044] Setting: the length of the small leading conduit is 2.5-3.5m, the small leading conduit includes a tube, the front end of the tube is connected to the pipe head 3, the rear end of the tube is connected to the iron hoop 2, the tube The head 3 is pointed and conical, and a number of holes 1 are provided on the side wall of the tube. The minimum distance between the iron hoop 2 and the holes 1 is 0.5-1.0m; the distance between adjacent holes 1 is 150mm, and the holes 1 The outer diameter of the small conduit ...

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Abstract

The invention discloses a primary supporting method for an underground excavation tunnel of an underpass airport terminal. The primary supporting method comprises the following steps that S1, an advanced small guide pipe is driven and grouted, wherein the length of the advanced small guide pipe is 2.5-3.5m, the advanced small guide pipe comprises a pipe barrel, the front end of the pipe barrel isconnected with a pipe head, the rear end of the pipe barrel is connected with an iron hoop, the pipe head is in a pointed cone shape, and a plurality of holes are formed in the side wall of the pipe barrel; S2, earth excavation is conducted; S3, a grating is installed and machined; S4, a foot locking anchor pipe is driven and grouted; S5, concrete is sprayed; and S6, backfilling and grouting are conducted after primary supporting. The primary supporting method has the advantages that excavation of a lower soil body is safe and stable; arch crown collapse is effectively controlled; and a stratum is reinforced, and slurry leakage is prevented.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to an initial support method for a submerged tunnel passing through an airport terminal building. Background technique [0002] At present, after the rough surface of the tunnel is excavated, the tunnel is reinforced with primary support and secondary lining to form a permanent tunnel support structure. As a form of outer support, the initial support of the tunnel can withstand the pressure of the surrounding rock and prevent the tunnel from collapsing. At present, during the excavation of drill-and-blast tunnel engineering, after each cycle of excavation, it is necessary to perform initial support shotcrete on the excavation rock surface. In the actual construction process, various geological conditions will be encountered. In the case of relatively stable geological conditions, the stability of the surrounding rock is high, the difficulty of tunnel construction is sma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/15E21D20/02E21D11/10
CPCE21D9/00E21D9/001E21D9/002E21D11/10E21D11/152E21D20/02
Inventor 廖建东孙洪涛杜勇晁春波胡彬肖志贤
Owner RANKEN RAILWAY CONSTR GROUP
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