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In-advance pilot tunnel freezing water stopping construction method for running tunnel

A technology for interval tunnels and pilot tunnels, which is applied in the direction of tunnels, tunnel linings, shaft linings, etc. It can solve the problems that interval tunnels cannot be frozen horizontally for a long distance, and achieve the effects of reducing the amount of excavation, saving costs, and flexible construction

Pending Publication Date: 2018-10-12
BEIJING URBAN CONSTR GROUP +1
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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 in the prior art, and propose a method of freezing and sealing the water in the leading tunnel of the interval tunnel, which can effectively form a frozen structure to isolate the hydraulic connection between the inside and outside of the excavation area, achieve the purpose of water sealing, and overcome the problem of the interval tunnel Defects that cannot freeze horizontally over long distances

Method used

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  • In-advance pilot tunnel freezing water stopping construction method for running tunnel
  • In-advance pilot tunnel freezing water stopping construction method for running tunnel
  • In-advance pilot tunnel freezing water stopping construction method for running tunnel

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Embodiment 1

[0041] See attached Figure 1-4 , a V-shaped freezing water-stop construction method for a leading pilot tunnel of a single-hole double-track tunnel of the present invention, comprising the following steps:

[0042] (1) Construction of the leading pilot tunnel 1: above the groundwater level on both sides of the reserved position of the interval tunnel 4, and at a certain distance from the side wall of the tunnel, construct two leading pilot tunnels, namely the left pilot tunnel and the right pilot tunnel;

[0043] The position of the leading pilot tunnel is slightly higher than the height position of the tunnel, so as to ensure the water-stop effect within the entire section of the tunnel.

[0044] According to the actual situation, the leading pilot tunnel can be used as an urban pipe gallery, and the interval tunnel freezing method is jointly constructed with the urban pipe gallery.

[0045]Since the working surface of the station is usually already available during the cons...

Embodiment 2

[0058] See attached Figure 7-10 , a W-shaped freezing water-stop construction method for a leading pilot tunnel of a double-hole single-track tunnel of the present invention, comprising the following steps:

[0059] (1) Construction of leading pilot tunnel 1: above the groundwater level on both sides of the reserved position of the two tunnels, and at a certain distance from the outer wall of the tunnel, construct two leading pilot tunnels, namely the left pilot tunnel and the right pilot tunnel. Above the groundwater level between the reserved positions of the two tunnels, construct a leading pilot tunnel, that is, the intermediate pilot tunnel;

[0060] The position of the leading pilot tunnel is slightly higher than the height position of the tunnel, so as to ensure the water-stop effect within the entire section of the tunnel.

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Abstract

The invention relates to an in-advance pilot tunnel freezing water stopping construction method for a running tunnel. A frozen structure can be effectively formed to isolate the hydraulic connection inside and outside an excavation area, and the purpose of water stopping is achieved. The in-advance pilot tunnel freezing water stopping construction method mainly comprises the steps of in-advance pilot tunnel construction, freezing pipe construction, freezing network construction, frozen wall forming and the like. A vertical shaft is excavated inwards longitudinally by means of a station operation face or constructed from the ground, due to the fact that the station operation face is formed in advance, the vertical shaft can serve as a later-period soil outlet channel, therefore the excavation engineering amount is decreased, materials are put to good use, the cost is saved, and the critical construction period is not affected; meanwhile, an in-advance pilot tunnel can serve as an urbanpipe gallery to be utilized, and a running tunnel freezing method and the urban pipe gallery are constructed jointly; and the cost is not increased, the critical construction period is not affected, and the advantages of underground water zero extraction, zero pollution and zero external drainage, high adaptability, flexible construction, environment protection, no pollution and the like are achieved.

Description

technical field [0001] The invention relates to the technical field of excavation and support in deep urban underground spaces, in particular to a freezing and water-stop construction process for tunnels in sensitive urban areas. Background technique [0002] With the development of urban modernization, public transportation can no longer meet the needs relying solely on ground space. The construction of underground railways is the inevitable result of urban development, and it is also a necessary measure to alleviate traffic congestion and encourage public transportation. [0003] Up to now, more than 30 cities in my country have built subways. With the continuous increase of subway mileage, it is also developing in depth. With the gradual increase of the excavation depth, the condition of the soil, the properties of the soil layer, and the stress state are constantly changing, and the groundwater has gradually become an important factor affecting the construction. How to e...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/38
CPCE21D9/001E21D11/38Y02E10/20
Inventor 张晋勋杨昊江玉生武福美邱德隆彭志勇
Owner BEIJING URBAN CONSTR GROUP