Tensile expansive hollow grouting bolt structure

A grouting bolt and expansion technology, which is applied in the installation of bolts, infrastructure engineering, sheet pile walls, etc., can solve problems such as poor anchorage of bolts, improve pullout resistance, improve compactness, and inhibit continuous loosening. deformation effect

Active Publication Date: 2019-01-11
SHIJIAZHUANG TIEDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a tension-expandable hollow grouting anchor structure to solve the technical problem of poor anchorage of the anchor existing in the prior art

Method used

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  • Tensile expansive hollow grouting bolt structure
  • Tensile expansive hollow grouting bolt structure
  • Tensile expansive hollow grouting bolt structure

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Embodiment Construction

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0025] see figure 1 , the tensile expansion type hollow grouting bolt structure provided by the present invention will now be described. The tension-expandable hollow grouting bolt structure includes a hollow grouting rod body 1 and a lateral extrusion device 2. One end of the hollow grouting rod body 1 is provided with a rod body grout stop cap 4, and the other end is provided with an anchoring section. A diversion hole 7 is provided in the axial center of the grout rod body 1, and a grouting hole 8 communicating with the diversion hole 7 is provided in the radia...

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Abstract

The invention provides a tensile expansive hollow grouting bolt structure and belongs to the technical field of fractured rock reinforcement. The structure includes a hollow grouting rod body and a lateral extruding device, wherein one end of the hollow grouting rod body is provided with a rod body stopper cap, the other end is provided with an anchoring section, the axial center of the hollow grouting rod body is provided with a diversion hole, a grouting hole communicating with the diversion hole is arranged in the radial direction, the lateral extruding device includes a sleeve, multiple expanding rods and multiple tapered blocks, one end of the sleeve is provided with a drilling plug cover, the other end is connected with the anchoring section through an elastic element, the multiple expanding rods radially pass through expansion holes correspondingly set on the sleeve, the multiple tapered blocks are sleeved on the hollow grouting rod body, the sleeve is stretched, and the expansion rods are squeezed outwards along the tapered surface of the corresponding tapered blocks in a sliding mode. The structure is advantaged in that not only can compactness of the rock mass be improved, but also anti-pulling performance of an anchor itself can be improved, and an effective means is provided for reinforcement of fractured rock masses of tunnels and slopes.

Description

technical field [0001] The invention belongs to the technical field of fissure rock mass reinforcement, and more specifically relates to a tension-expandable hollow grouting bolt structure. Background technique [0002] In the reinforcement of tunnel surrounding rock and slope rock mass, bolt is an economical, efficient and safe reinforcement method, which has been widely used in engineering practice. The current bolt support mainly uses solid threaded steel bars as the rod body, and the external grouting of the rod body is used to fill the gap between the bolt and the borehole with grout, and let the grout penetrate into a certain range of rock mass around the hole wall. After solidification, the grouting body and the anchor rod are connected as a whole. There are significant defects in this reinforcement method: (1) Since the anchoring is performed only by the friction force between the thread on the surface of the rod body and the grouting body, the contact surface betwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D21/00E21D20/02E02D17/20E02D5/74
CPCE02D5/74E02D17/20E21D20/021E21D20/028E21D21/004
Inventor 袁维黎海滨王伟常江芳闻磊
Owner SHIJIAZHUANG TIEDAO UNIV
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