Cup-type pre-grouting reinforcing method for full-section curtain grouting

A curtain grouting and pre-grouting technology, which is applied in earthwork drilling, wellbore lining, tunnel lining, etc., can solve the problems of complex construction process, high cost, secondary plugging and rework, etc., and achieve obvious effect of construction period benefit

Inactive Publication Date: 2019-03-08
CHINA FIRST HIGHWAY ENG
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Problems solved by technology

[0005] This method has high technical requirements, complex construction technology, long construction period and high cost. If there is a slight carelessness in the implementation and treatment, it will cause legacy problems ...

Method used

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  • Cup-type pre-grouting reinforcing method for full-section curtain grouting
  • Cup-type pre-grouting reinforcing method for full-section curtain grouting

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Embodiment Construction

[0076] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0077] see Figure 1-Figure 2 , a cup-shaped pre-grouting reinforcement method for full-section curtain grouting, which improves the full-section curtain grouting and adopts the concept of cup-shaped pre-grouting reinforcement, that is, through the peripheral curtain 2 (including the arch tube curtain 3) and the central hole The water-stop rock plate 4 (cup bottom) formed by bottom grouting forms a cup-shaped three-dimensional water-stop reinforcement ring to solve the two problems of water-rich fault water-stop and collapse prevention.

[0078] Before entering the fault, reserve 10m of magma-stop rock plate, and use advanced pipe shed grouting to form a pipe curtain in the 120° range of the arch, and use segmental retreat deep hole grouting for the rest of the surrounding holes to form a 360° water-stop reinforcement...

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Abstract

The invention discloses a cup-type pre-grouting reinforcing method for full-section curtain grouting. Through water-stop laccolith, namely the cup bottom formed by a surrounding curtain and the centerhole bottom which are grouted, the surrounding curtain comprises an arch part pipe curtain, a cup-type three-dimensional water-stop reinforcing ring is constituted, 10 m of grout-stop laccolith is reserved before entering a fault, an arch part is subjected to advanced pipe shed grouting within the range of 120 degrees to form the pipe curtain, and remaining surrounding holes are subjected to sectional retreating-type deep hole grouting to form a water-stop reinforcing curtain with the periphery of the contour line being excavated by 360 degrees. Cup-type pre-grouting construction of the method has three cycles; the consumed time of cup-type grouting of each cycle is reduced compared with the full-section curtain grouting time, and the construction period benefits are obvious; cup-type grouting and curtain grouting schemes both meet the requirements of safety and feasibility, but the cost and the construction period of curtain grouting are both not accepted, and cup-type grouting has the obvious advantages; and thus, the cup-type pre-grouting reinforcing method for full-section curtain grouting has the more obvious construction period benefits.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a cup-shaped pre-grouting reinforcement method for full-section curtain grouting. Background technique [0002] At present, during tunnel construction, the principle of "mainly drainage" is adopted for groundwater discharge; for tunnels passing through karst and fractured zones, where the groundwater is expected to be relatively large and the ecological environment is affected by drainage, the principle of "mainly blocking" is usually adopted. Based on the principle of "limited discharge" to achieve the purpose of effective water gambling, reliable waterproof, environmental protection, and economical rationality. [0003] Full-section curtain grouting is to distribute holes on the entire section, and form a water-cutting curtain through grouting to block groundwater infiltration, enhance the self-stabilization ability of the ground, and strengthen the surrounding rock...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D11/38E21D9/00
CPCE21D9/001E21D11/10E21D11/38
Inventor 薛君薛春瑞李尊武尹鹏飞王贺起陈鹏高刘博文
Owner CHINA FIRST HIGHWAY ENG
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