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Pressure reducing horizontal reinforcing process for soft soil layer

A technology of horizontal reinforcement and strata, applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of inevitable soil uplift, adverse effects of surrounding structures and the environment, and inability to release pressure in a timely and effective manner. effect of influence

Inactive Publication Date: 2007-06-27
SHANGHAI FOUND ENG GRP
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its biggest disadvantage is that the pressure generated during the spraying process cannot be released effectively in time, so the soil in the reinforcement area will inevitably be uplifted, which will have adverse effects on surrounding structures and the environment

Method used

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Examples

Experimental program
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Embodiment Construction

[0022] 1. The present invention adopts the working principle of composite pipe horizontal rotary spraying:

[0023] The composite pipe horizontal rotary spraying means that the four composite pipes in the horizontal nozzle work together to complete the operation. One is a hardened material nozzle, one is a compressed air nozzle, one is a high-pressure water nozzle, and the other is a slurry outlet pipe.

[0024] When the horizontal rotary spraying operation, the hardened material and compressed air are sprayed from the hardened material and the compressed air pipe nozzle respectively. At this time, the drill pipe is sprayed at 180° to cut the soil. At the same time, the high-pressure water nozzle feeds water at the same time and flows back at high speed to form a vacuum at the mouth of the slurry outlet, so that the mud replaced by the cement slurry is discharged from the slurry outlet.

[0025] 2. The process steps of the present invention:

[0026] 1. Construction preparation

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Abstract

A horizontal reinforcing technology for decreasing the pressure to soft earth stratum includes such steps as construction preparation, horizontal drilling, and horizontally spinning and spraying the hardening grout for reinforcing the soft earth stratum. The drilling rod is swung by 180 deg. for cutting earth while the hardening grout and compressed air are sprayed out via respective nozzles. The high-pressure water is sprayed out at same time for draining the sludge in time.

Description

Technical field [0001] The invention relates to a ground reinforcement technology for underground buildings, in particular to a horizontal reinforcement technology for soft soil layers. Background technique [0002] At present, in the construction of urban tunnels, the rotary grouting method developed in accordance with the requirements for reinforcement of the excavation surface and the working conditions in the tunnel in urban tunnel engineering has been applied in Europe in the 1980s. In urban subway projects, there have also been many successful applications. For example, the Milan subway in Italy is used to excavate the side channel in the pilot tunnel to pre-form an arched horizontal rotary grouting reinforcement. In the Naples light rail construction, when the tunnel passes through the foundation of the building, In the tunnel face, an arched horizontal jet-grouting pile with steel pipes inserted into the tunnel is formed in advance to reinforce the solid. [0003] Japan's...

Claims

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Application Information

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IPC IPC(8): E02D3/12
Inventor 蔡忠明王吉望沈水龙朱建明白廷辉
Owner SHANGHAI FOUND ENG GRP
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