Treatment method for tunnel local collapse

A tunnel and partial technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems that threaten the personal safety of construction personnel, equipment safety, block falling, and complicated processes, etc., to overcome the complexity of construction procedures, prevent continued collapse, The effect of saving construction time

Inactive Publication Date: 2015-03-04
CENT SOUTH UNIV
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Problems solved by technology

However, the above two methods must use a support system consisting of I-beams and steel grids to support the excavated part, and the processes of grouting, excavation, and support must be carried out in sequence
When supporting, the assembly and support of the I-beam and steel grid are all carried out on the working surface. Therefore, during the support, excavation cannot be carried out, and the support cannot be carried out during the excavation, resulting in a long process implementation cycle. The process is complicated; in addition, when the I-beam and steel grid are assembled and supported on the working face, blocks often fall off, which seriously threatens the personal safety of construction workers and the safety of equipment
In addition, the steel grating has a certain size of mesh, which cannot completely prevent the occurrence of falling blocks.

Method used

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  • Treatment method for tunnel local collapse

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Effect test

Embodiment 1

[0035] Embodiment 1: Steel bellows method construction

[0036] Step 1, outside the landslide-affected section on one side of the tunnel collapse position, make a plurality of support bodies with steel plates, the cross-section of each support body is the same as the tunnel profile shape; the length of each support body along the tunnel axis direction is 1.25 meters; In the present embodiment, it is considered that the section affected by the landslide is within 8 meters from one side of the tunnel landslide position;

[0037] Step 2. Use heavy machinery, such as excavators, bulldozers, forklifts, etc., to push the first support body to the section affected by the collapse of the tunnel, and then connect the second support body and the first support body with the same axis And advance to the section affected by the tunnel collapse, repeat the above steps until the multiple supports are connected with the same axis and advanced to the collapse section of the tunnel, after the e...

Embodiment 2

[0042] Embodiment 2: Steel bellows grouting method construction

[0043] Step 1. Begin grouting and consolidation of the tunnel surrounding rock from the collapse-affected section on the side of the tunnel collapse position 8m away from the edge of the collapse section, and the grouting position gradually advances to the tunnel collapse position; adjacent grouting points on the same cross section The circumferential spacing is 1 meter, the length of the small conduit is not less than 4m, and the overlapping distance is not less than 1m;

[0044] Step 2. On the side of the tunnel collapse position, make multiple supports with steel plates. The cross-section of each support is the same as the shape of the tunnel outline. The length of each support along the axis of the tunnel is 1.25 meters. The coaxial connection between the bodies is integrated, and the bolts are used to fasten the connection, and the nut pre-tightening torque is 340N.m±70N.m; when a grouting position reaches ...

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Abstract

The invention discloses a treatment method for tunnel local collapse. A supporting body with the cross-section shape which is identical to that of a tunnel is produced by a corrugated pipe, the supporting body is pushed into a tunnel collapse affected section and a collapse body, cleaning of the collapse body can be performed, or grouting and solidification are performed on tunnel surrounding rock of the collapse affected section and surrounding rock at the position of the collapse body and then the supporting body is pushed into the collapse body so as to perform cleaning on the collapse body. By means of the treatment method for tunnel local collapse, defects of complicated construction processes, large resource consumption and long construction period in the prior art can be overcome, particularly, defects that totally sealed protection of loose rock and earth mass can not be achieved and personal safety of constructors and device safety are severely threatened in the prior art can be overcome, and construction safety can be effectively improved. According to the treatment method for tunnel local collapse, totally sealed protection is achieved in the tunnel by means of a steel corrugated pipe, the construction period is effectively saved, the tunnel stability and safety can be guaranteed, and processes and steel quantity of I steel supporting, steel grating supporting and the like can be effectively reduced. Besides, the treatment method for tunnel local collapse is suitable for engineering application.

Description

technical field [0001] The invention discloses a treatment method for partial collapse of a tunnel, and relates to the technical field of construction engineering. Background technique [0002] At present, there are mainly methods such as grouting pipe shed method and conduit grouting method for tunnel collapse control. [0003] Grouting pipe shed method and conduit grouting method, both of which are to drill holes from the working face, drive into the pipe shed or conduit, and implement grouting; they use the advanced support of the pipe shed or conduit and the improvement effect of grouting on the surrounding rock To strengthen the surrounding rock, the reinforcement strength is high, the support is stable, and it has been widely used in engineering. The effect of strengthening the surrounding rock fully meets the construction process requirements. However, the above two methods must use a support system consisting of I-beams and steel grids to support the excavated part,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/10
CPCE21D9/00E21D11/10
Inventor 刘敦文褚夫蛟
Owner CENT SOUTH UNIV
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