Feather-shaped directional soft rock tunnel advanced grouting pre-reinforcing structure and method

An advance grouting and pre-reinforcement technology, which is applied in tunnels, earthwork drilling, mining equipment, etc., can solve the problems of limited tunnel face space, difficult construction, and difficulty in positioning construction equipment, so as to save grouting materials and The effect of construction workload, improvement of economic and social benefits, reproducibility and generalizability

Pending Publication Date: 2021-04-30
BEIJING MUNICIPAL ROAD & BRIDGE +1
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  • Abstract
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Problems solved by technology

However, due to the limited space on the face of the tunnel, it is difficult to install construction equipment, which brings great difficulties to the constructio

Method used

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  • Feather-shaped directional soft rock tunnel advanced grouting pre-reinforcing structure and method
  • Feather-shaped directional soft rock tunnel advanced grouting pre-reinforcing structure and method
  • Feather-shaped directional soft rock tunnel advanced grouting pre-reinforcing structure and method

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Example Embodiment

[0046]The invention is further explained in conjunction with the Beijing subway tunnel embodiment, but the present invention is not limited to the following examples.

[0047]0-15 meters under the ground in Beijing, the ground is a powder of powder clay and sand layer, rich in groundwater, and the groundwater type is a diving-pressure water mixture, and the subway tunnel section is 100m2Around, the tunnel construction method is a CRD method. When the tunnel (6) is constructed in the soft rock formation (7) to the palm surface (7), the grouting of the front rock in front of the palm is pre-reinforced.

[0048]The first step in the present invention is to the drilling machine, and the construction is performed according to the tunnel design drawing, determine the position of the grout hole, and the drilling position is arranged in the center position of the tunnel facade;

[0049]In the second step, the grouting hole is applied by the horizontal rig, and the grouting area is first applied to t...

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Abstract

The invention provides a feather-shaped directional soft rock tunnel advanced grouting pre-reinforcing structure and method, and belongs to the field of underground engineering and geotechnical engineering construction. The reinforcing structure comprises a feather-shaped directional grouting drill hole (1), a flexible drilling tool (2), a directional drill bit (3) and a drill bit guide controller (4), wherein the feather-shaped directional grouting drill hole (1) comprises a center drill hole and a plurality of branch drill holes dispersed towards the periphery; the center drill hole is a long drill hole which is pre-drilled by a drilling machine and is consistent with the axial length direction of a tunnel; a steel protection tube for protecting the well wall is put into the long drill hole; the branch drill holes are a plurality of bent drill holes which extend from the center drill hole to the periphery and point to the inner wall of the tunnel (6); the number of the branch drill holes in the circumferential direction of the center drill hole is 2 to 6; the branch drill holes are uniformly distributed in the axial length direction of the center drill hole; and the integral structure of the center drill hole and the branch drill holes is of a feather-shaped structure; grouting is performed in the branch drill holes to form the reinforcing structure.

Description

technical field [0001] The invention relates to an advance grouting pre-reinforcement method for a plume directional soft rock tunnel, belonging to the field of underground engineering and geotechnical engineering construction methods. Background technique [0002] For soft rock tunnels, due to the low strength of surrounding rock and poor self-stabilization ability, construction risks and construction quality problems such as collapse and large deformation are likely to occur. Grouting pre-reinforcement treatment, the grouting holes are arranged in a quincunx shape on the face of the tunnel, and the drilling holes are used to inject cement slurry to reinforce the surrounding rock in front. However, due to the limited space on the tunnel face, it is difficult to locate construction equipment, which brings great difficulties to the construction. At the same time, a large number of grouting holes need to be constructed, resulting in waste of engineering quantity and materials,...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D9/04E21B33/13E21B17/20
CPCE21B17/20E21B17/206E21B33/13E21D9/001E21D9/04
Inventor 丁春福邓洪亮张维赵明李凌宜时光曹亮刘雪朝刘振民何彬李小鹏闫云飞
Owner BEIJING MUNICIPAL ROAD & BRIDGE
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