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Novel tunnel advanced small guide pipe, advanced support system and construction method

An advanced small conduit and tunnel technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as failure to reach design pressure, influence on construction organization arrangements, and inability to spread and solidify grout, so as to ensure construction safety and avoid encirclement. Rock deformation hard to control effect

Pending Publication Date: 2020-03-31
CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Under the premise of satisfying the safety of tunnel construction, different types of pre-support measures have different adaptability to the advanced failure mode. For the instability of surrounding rock with frontal extrusion failure, the best pre-support measure is the advanced Small conduit + grouting, but advanced small conduits are often processed and produced in a factory, and the specifications and formats cannot fully meet the actual needs of the site
[0004] At the same time, in the weak and broken surrounding rock section of the tunnel, whether mechanical excavation or blasting is adopted, local over-excavation generally exists. The leakage is outside the surrounding rock (or the surface of the inserted surrounding rock is too weak and broken), the grout leakage is serious during the grouting process of the advanced small conduit, the design pressure cannot be reached, the grout cannot diffuse and solidify, and the advanced support is used as the tunnel support system. An important component, which can effectively control the deformation of the surrounding rock during the whole process of tunnel construction. If the grouting fails to achieve the expected effect, the deformation of the surrounding rock will be difficult to control. It may be necessary to take remedial measures such as lining jumping, which affects the normal construction organization

Method used

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  • Novel tunnel advanced small guide pipe, advanced support system and construction method

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0029] see figure 1 As shown, the embodiment of the present invention provides a new type of tunnel leading small catheter, which includes a catheter body 1 and a sleeve 2. One end of the catheter body 1 is provided with a grouting port, and the other end is provided with a number of grouting holes 11. The sleeve 2 is fixed. Located outside the conduit body 1 , the sleeve 2 covers a part of the grouting holes 11 , and another part of the grouting holes 11 is located on the side of the sleeve 2 away from the grouting port.

[0030] The casing 2 provided can close the grouting hole 11 that is not inserted into the surrounding rock, so as to avoid the situation of grout leakage when using the advanced small conduit for grouting operation, resulting in the insufficient grouting pressure in the surrounding rock. When the design pressure is reached...

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Abstract

The invention discloses a novel tunnel advanced small guide pipe, an advanced support system and a construction method and relates to the technical field of tunnel construction advanced support. The advanced small guide pipe comprises a guide pipe body and a casing pipe. A grouting opening is formed in one end of the guide pipe body, a plurality of grouting holes are formed in the other end of theguide pipe body. The guide pipe body is fixedly sleeved with the casing pipe. The casing pipe covers a portion of the grouting holes, and the other portion of the grouting holes are located in the side, away from the grouting opening, of the casing pipe. By the adoption of the novel tunnel advanced small guide pipe, the advanced support system and the construction method, the grouting effect of the advanced small guide pipe can be ensured, and the construction safety is ensured.

Description

technical field [0001] The invention relates to the technical field of advance support in tunnel construction, in particular to a novel tunnel advance small conduit, an advance support system and a construction method. Background technique [0002] The tunnel advance support structure system is the key to the stability control of the surrounding rock, and is also the basic task of tunnel design and construction. For the weak and broken surrounding rock with poor self-stability, advance pre-reinforcement and advance pre-support measures are usually used to improve the safety of tunnel construction. . The essence of advanced reinforcement is to increase the strength of surrounding rock, making it less prone to serious damage, maintaining a certain self-stabilization time, and mobilizing the bearing capacity of surrounding rock; the essence of advanced support is to form a load-bearing arch in advance to bear the load of surrounding rock and protect the excavation surface. and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D9/00
CPCE21D11/105E21D9/001
Inventor 张毅新王文勇黄中华艾侠颉建中赵俊陈家骖陈强左晟
Owner CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD
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