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Method for constructing advance support anchor rod on tunnel face of soft rock section with hole easy to collapse

A technology of advanced support and bolt construction, which is used in the installation of bolts, earth-moving drilling, mining equipment, etc., can solve the problem that the insertion effect of glass fiber bolts is greatly reduced, the quality cannot be guaranteed, and the face collapses. problems, to achieve the effect of saving the amount of bolts and drilling holes, saving the sealing materials, and ensuring the quality

Pending Publication Date: 2022-07-22
CHINA RAILWAY NO 3 GRP CO LTD +1
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Problems solved by technology

However, for V-level surrounding rock, especially in soft rock with large deformation, the drilled hole is easily deformed and collapsed. The insertion effect of glass fiber bolts is greatly reduced compared with the hole depth, and the quality cannot be guaranteed. There is a risk of collapse on the face of the tunnel, with considerable consequences. serious

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  • Method for constructing advance support anchor rod on tunnel face of soft rock section with hole easy to collapse
  • Method for constructing advance support anchor rod on tunnel face of soft rock section with hole easy to collapse
  • Method for constructing advance support anchor rod on tunnel face of soft rock section with hole easy to collapse

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Embodiment Construction

[0022] In order to have a clearer understanding of the technical features, objects and effects of the present invention, the specific embodiments of the present invention will now be described with reference to the accompanying drawings. The content shown in each figure is only used to understand the technical content of the invention, and does not represent the actual scale and real shape of the product, wherein the same reference numerals indicate parts with the same structure or the same function but similar structures.

[0023] In this text, "parallel", "perpendicular" and the like are not limitations in strict mathematical and / or geometric senses, and may also include errors that can be understood by those skilled in the art and allowable when manufacturing or using the product. In addition, "perpendicular" includes not only the mutual perpendicularity when two objects are directly in contact with each other in space, but also the mutual perpendicularity when two objects a...

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Abstract

The invention belongs to the technical field of anchor rod supporting, and particularly relates to a construction method for advance supporting anchor rods of a tunnel face in a soft rock hole collapse-prone section. A hollow drill rod and a hollow drill bit are adopted for drilling, and a drilling piece which is opened from inside to outside and blocks a central hole of the drill bit from outside to inside is arranged on the drilling-in side of the drill bit; after drilling is completed, a glass fiber anchor rod is inserted into the drill hole through central holes of a drill rod and a drill bit, an ejector rod with the length larger than that of a single-section drill rod is used for abutting against the glass fiber anchor rod, after the drill rod and a drilling machine are disconnected, drilling is withdrawn section by section till the drill rod completely withdraws, and grouting is conducted in the drill hole; and drilling is followed through the casing pipe, and the glass fiber anchor rod is installed, so that the hole forming depth is ensured, and the advanced reinforcement range and quality of the tunnel face surrounding rock are ensured.

Description

technical field [0001] The invention belongs to the technical field of bolt support, and in particular relates to a construction method for supporting the bolt in advance of the tunnel face in a section of a soft rock easily collapsed hole. Background technique [0002] In the past, the installation process of the fiberglass bolt was to drill back after drilling, and directly insert the processed fiberglass bolt into the hole. However, for the V-grade surrounding rock, especially the large deformation area of ​​soft rock, the drilled hole is easy to deform and collapse, the insertion effect of the glass fiber bolt is greatly reduced compared with the hole depth, the quality cannot be guaranteed, and the face of the tunnel has the risk of collapse, and the consequences are quite serious. SUMMARY OF THE INVENTION [0003] An object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages which will be explained later....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D20/02
CPCE21D20/003E21D20/02
Inventor 刘易枫刘志如杜英杰孙伯乐汪智渊王建平褚晓晖赵亚军张凌霄陈现辉张松杨鸿飞魏建森罗功朝龚军立刘佳张福忠
Owner CHINA RAILWAY NO 3 GRP CO LTD
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