Pressure tube friction type extendable anchor rod

A bolt and tube type technology, which is applied in the installation of bolts, mining equipment, earthwork drilling and mining, etc., can solve the problems of complex bolt structure, unfavorable market promotion, rare road tunnels, etc., and achieves easy popularization and application and long service life , the effect of a simple structure

Active Publication Date: 2019-04-30
CHENGDU UNIVERSITY OF TECHNOLOGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By changing the shape of the rod body and adding a resistance-increasing structure, the frictional energy-absorbing bolt can better cope with large deformations, but this structural change makes the bolt structure more complex, resulting in increased costs, which is not con

Method used

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  • Pressure tube friction type extendable anchor rod
  • Pressure tube friction type extendable anchor rod
  • Pressure tube friction type extendable anchor rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The purpose of this embodiment is to provide a tube-type friction-type extensible anchor rod.

[0037] Such as figure 1 As shown, the tube-type friction-type extensible anchor includes an anchor 1 and a sleeve 2, the sleeve 2 is sleeved on the anchor 1, and the side wall of the sleeve 2 and the side wall of the anchor 1 A damping tube 3 is provided, and the damping tube 3 is welded on the side wall of the anchor rod 1. The upper end of the anchor rod 1 is fixed with a damping block 4. The upper part of the damping block 4 is a straight line segment 41, which is cylindrical, and the lower part of the damping block 4 Be the taper section 42, be conical frustum shape, the cross-sectional area of ​​the top of the taper section 42 is greater than the cross-sectional area of ​​the bottom of the taper section 42, namely the cross-section of the taper section 42 gradually becomes smaller from top to bottom, and the damping tube 3 can be deform in its radial direction.

[0038...

Embodiment 2

[0041] The purpose of this embodiment is to provide a tube-type friction-type extensible anchor rod.

[0042] Such as Figure 1-6 As shown, the tube-type friction-type extensible anchor includes an anchor 1 and a sleeve 2, the sleeve 2 is sleeved on the anchor 1, and the side wall of the sleeve 2 and the side wall of the anchor 1 A damping tube 3 is provided, and two slender damping tubes 3 are symmetrically welded on both sides of the anchor rod 1 respectively. The upper end of the anchor rod 1 is fixedly provided with a damping block 4, the upper part of the damping block 4 is a straight section 41, which is cylindrical, and the lower part of the damping block 4 is a tapered section 42, which is in the shape of a truncated cone, and the cross-sectional area of ​​the upper part of the tapered section 42 is larger than The cross-sectional area of ​​the lower part of the tapered section 42 , that is, the cross-section of the tapered section 42 gradually decreases from top to b...

Embodiment 3

[0047] The purpose of this embodiment is to provide a tube-type friction-type extensible anchor rod.

[0048] Such as Figure 1-6 As shown, the tube-type friction-type extensible anchor includes an anchor 1 and a sleeve 2, the sleeve 2 is sleeved on the anchor 1, and the side wall of the sleeve 2 and the side wall of the anchor 1 A damping tube 3 is provided, and two slender damping tubes 3 are symmetrically welded on both sides of the anchor rod 1 respectively. The upper end of the anchor rod 1 is fixedly provided with a damping block 4, the upper part of the damping block 4 is a straight section 41, which is cylindrical, and the lower part of the damping block 4 is a tapered section 42, which is in the shape of a truncated cone, and the cross-sectional area of ​​the upper part of the tapered section 42 is larger than The cross-sectional area of ​​the lower part of the tapered section 42 , that is, the cross-section of the tapered section 42 gradually decreases from top to b...

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Abstract

The invention belongs to the technical field of road tunnel support, and discloses a pressure tube friction type extendable anchor rod which comprises an anchor rod and a sleeve, wherein the anchor rod is sleeved with the sleeve; damping tubes are disposed between the side wall of the sleeve and the side wall of the anchor rod; a damping block is disposed at the upper end of the anchor rod; a straight section is arranged at the upper part of the damping block; a tapered section is disposed at the lower part of the damping block; the cross-sectional area of the upper part of the tapered sectionis greater than the cross-sectional area of the lower part of the tapered section; and the damping tubes are deformable in the radial direction. The extendable anchor rod has the advantages that by arranging the damping block and the damping tubes, the damping block continuously squeezes the damping tubes on both sides when entering the sleeve, so that a certain frictional force is generated between the damping block and the damping tubes, and when the surrounding rock deformation in a tunnel occurs, the constant resistance of large deformation is continuously provided by the frictional forceso as to delay the expansion of a plastic zone to accommodate the large deformation.

Description

technical field [0001] The invention belongs to the technical field of highway tunnel support, and in particular relates to a pressure-tube type friction-resistance type extensible bolt. Background technique [0002] At present, shotcrete bolt support is almost always used in soft rock tunnel support. According to the characteristics of different formations and the deformation mechanism of the surrounding rock, the shotcrete anchor support can be improved and optimized, such as the use of system anchors, combined anchors and extensible anchors. However, most of the bolts used in current tunnel engineering are non-shrinkable rigid bolts, which cannot work well under large deformation conditions. According to the mechanism of large deformation, it is reasonable to adopt the extensible anchor rod to adapt to the large deformation. Throughout the past 20-30 years, the design of extensible anchors is mainly based on yielding anchors and frictional anchors. These anchors can ad...

Claims

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Application Information

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IPC IPC(8): E21D21/00
CPCE21D21/0026E21D21/0033
Inventor 李天斌牟力张文居李磊李晓峰何成孟陆波宋涛
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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