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Short tube and short tube sand consolidation agent strengthening construction process

A construction technique and a short conduit technology, which can be applied in shaft lining, tunnel lining, underground chamber, etc., can solve problems such as the influence of tunnel construction in sand layer underground excavation, environmental pollution of groundwater, difficulty in controlling the grout ratio and grouting amount, etc. Achieve the effect of saving grouting construction materials, less groundwater pollution, and beneficial to the protection of groundwater environment

Inactive Publication Date: 2009-02-04
THE FIFTH ENG CO LTD OF CHINA TIESIJU CIVIL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method avoids the problems of underground tunnel collapse, sand loss and quicksand to a certain extent, but it causes huge pollution to the groundwater environment
The pre-reinforcement effect of double-liquid grout is limited by the influence of time and groundwater. It is difficult to control the grout ratio and grouting amount during the grout preparation process, which has a great impact on the construction of sand-layer underground excavation tunnels.

Method used

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  • Short tube and short tube sand consolidation agent strengthening construction process
  • Short tube and short tube sand consolidation agent strengthening construction process
  • Short tube and short tube sand consolidation agent strengthening construction process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0019] A short conduit comprising steel pipe 1 such as figure 1 As shown, the pipe body of the steel pipe 1 is provided with several holes 2 holes, one end of the steel pipe 1 is set as a triangular cone 3, and the tapered part is provided with a cotton yarn 4.

[0020] The steel pipe body is 1.0-1.5m long.

[0021] The reinforcement construction process of a short-pipe sand-consolidating agent includes,

[0022] 1) Insertion of short catheter and positioning of short catheter

[0023] After the grid erection is installed, use a high-pressure air gun to blow the holes, insert and drill a short conduit, and then use a pick to push the short conduit into it. The nozzle leaks outside, and insert a locking anchor at the arch foot of the grid, and use it before concrete injection. Cotton yarn is used to block the nozzle of the short catheter;

[0024] 2) Grouting face closed

[0025] When spraying concrete, seal the face of the face within 30cm below the grille of the arch of t...

specific Embodiment

[0039] The section of the submerged tunnel in the first contract section of the first phase project of a subway line 1 is all located in the sand layer, and the bottom is a clay layer, and there is a large stagnant water between the sand layer and the clay layer. During the underground excavation construction of subway tunnels, the "short-sand layer conduit sand-consolidating agent reinforcement technology" was adopted, which successfully overcome the difficulties of underground excavation tunnel construction in sandy strata such as tunnel collapse, vault sand loss, and arch foot quicksand.

[0040] The construction process of the short-pipe sand-consolidating agent reinforcement technology in the sand layer is as follows:

[0041] Processing and making short conduits. The length of the short conduit is 1.5m. Use a drilling machine to drill 22 holes in the shape of a plum blossom on the pipe body. One end of the short conduit is processed into a tapered shape, and the tapered ...

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Abstract

The invention relates to a short canal and a short canal sand consolidation agent reinforcing construction technique. The short canal includes a steel pipe; the body of the steel pipe is provided with a plurality of holes; one end of the steel pipe is provided with a pyrometric cone; the cone part is provided with a cotton yarn. The short canal sand consolidation agent reinforcing construction technique includes inserting and beating the short canal as well as locating the short canal; grouting and closing a tunnel face; grouting construction on the tunnel face. The technique solves the problem of large pollution to the underground water and not good rock surrounding and reinforcing effects during the consturction process and has the characteristics of less pollutoin to the underground water, good rock surrounding and reinforcing effects, being not restrained by time, being simply and easily operated, low cost, high safety factor, and the like. The short canal and a short canal sand consolidation agent reinforcing construction technique can be broadly applied to the tunnel construction of underground cutting with shallow overburden of a water-enriched sandy stratum.

Description

Technical field [0001] The invention relates to a short conduit and a short conduit sand-consolidating agent reinforcement construction technology in the technical field of underground excavation tunnel construction. Background technique [0002] In the construction of modern underground excavation tunnels, with the advancement of science and technology, operators' awareness of personal safety, environmental protection, and energy conservation is increasing day by day. Due to the advantages of no noise during construction, no change to the surface environment, no interruption of ground economic activities, short construction period and low cost, underground excavation tunnels are widely used in tunnel construction. When this technology is used for construction in V-type surrounding rock (sand layer), the surrounding rock of the underground excavation tunnel is firstly pre-reinforced with small conduit grouting in advance. What effective measures to take to realize the advan...

Claims

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Application Information

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IPC IPC(8): E21D11/00
Inventor 张付林王福恩孙爱军杜春生王小庆吴海红
Owner THE FIFTH ENG CO LTD OF CHINA TIESIJU CIVIL ENG GRP
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