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Anchor rod/anchor cable with constant resistance and large deformation and design method thereof

A technology with constant resistance and large deformation and bolts, which is applied in the installation of bolts, mining equipment, earth-moving drilling, etc., can solve the problems of discontinuous resistance, high safety hazards, shearing core rusting and falling off, etc.

Inactive Publication Date: 2014-10-15
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This product mainly has four defects: First, because the shear nuclei are arranged and distributed with intervals, the resistance is intermittent and discontinuous during the pulling process of the anchor rod. After a group of shear nuclei are damaged, the anchor rod will There is a short time when it suddenly loses its function, which is very unfavorable to the actual operation of the support project and poses a great safety hazard
Second, the sleeve acts through the direct shear failure of the shear core, and the ultimate resistance is the shear force at the time of failure. Therefore, the mechanical properties (direction, size) of the resistance are simple, and the scalability of the product application is limited. Working conditions require targeted design of bolts with specific mechanical indicators
Third, the shear core is welded on the surface of the anchor rod body, which is prone to adverse consequences due to false welding and false welding, and the processed anchor rod is also prone to rust and fall off of the shear core due to improper storage

Method used

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  • Anchor rod/anchor cable with constant resistance and large deformation and design method thereof
  • Anchor rod/anchor cable with constant resistance and large deformation and design method thereof
  • Anchor rod/anchor cable with constant resistance and large deformation and design method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Such as Figure 1-1 to Figure 1-3 As shown, a constant resistance large deformation bolt / cable is processed.

[0068] Picture 1-1 It is a schematic cross-sectional view of the anchor rod / cable structure with constant resistance and large deformation; Figure 1-2 yes Picture 1-1 A-A' sectional view of ; Figure 1-3 yes Picture 1-1 The B-B' cutaway diagram. Constant resistance and large deformation anchor rod / cable, including rod / cable body 1, constant resistance sleeve 2, cutting tool 3; rod / cable body 1 is a stepped shaft structure, including large outer diameter section 11 and small outer diameter section 12. The end of the large outer diameter section 11 expands to form a base 111; the constant resistance sleeve 2 is a cylindrical structure with one end closed and the other open. Profit connection.

[0069] Figure 1-4 It is a schematic cross-sectional view of the cutting tool structure. The cutting tool 3 includes a cylindrical shell 32 with two ends open. T...

Embodiment 2

[0072] Such as Figure 2-1 to Figure 2-3 As shown, a constant-resistance large-deformation anchor rod / cable is processed, and its similarities with Embodiment 1 will not be repeated. The difference lies in the design of the large outer diameter section 11 of the rod / cable body 1.

[0073] diagram 2-1 It is a schematic cross-sectional view of the anchor rod / cable structure with constant resistance and large deformation; Figure 2-2 yes diagram 2-1 A-A' sectional view of Figure 2-3 yes diagram 2-1 The B-B' cutaway diagram. The large outer diameter section 11 is an external spline structure covering the ribs 14 on the outside; the end of the large outer diameter section 11 expands to form a base 111 . The constant resistance sleeve 2 is a cylindrical structure with one end closed and one end open, which is sleeved outside the large outer diameter section 11 and is interference-connected with the large outer diameter section 11 through a base 111 . The cutting tool 3 abu...

Embodiment 3

[0076] Such as Figure 3-1 As shown, a constant-resistance large-deformation anchor rod / cable is processed, and its similarities with Embodiment 2 will not be repeated. The difference lies in the design of the large outer diameter section 11 of the rod / cable body 1.

[0077] Figure 3-1 It is a structural schematic diagram of the rod / cable body 1. The rib 14 is wedge-shaped, and the cross-sectional area of ​​the rib 14 increases gradually along the direction from the shoulder 13 to the end of the rod / cable body 1 .

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Abstract

The invention relates to an anchor rod / anchor cable with constant resistance and large deformation and a design method thereof. Aiming at the defects that the resistance of an existing anchor rod with large resistance is intermittently uncontinuous in the drawing process, the invention provides the anchor rod / anchor cable with constant resistance and large deformation. The product comprises a rod / cable body, a constant-resistance sleeve and a cutting tool, wherein the rod / cable body is in a ladder-shaped axial structural body and comprises a large outer diameter section and a small outer diameter section; the constant-resistance sleeve is in a cylindrical structure with one enclosed end and an opened end, and sleeves the large diameter section externally; the cutting tool is in an annular shape and is inserted in the external part of the small outer diameter section. The invention provides two specific structures, including a slotting way and a ridge bar type. The product provided by the invention can provide the design method of the anchor rod / anchor cable with constant resistance and large deformation, including the parameters of the design of slot depth h of the slotting type, the height h of the ridge bar type ridge bar, and a contact width b between the ridge bar and a knife edge. The design method is easy to realize the regulation of the consistent resistance and meet the demand of the working conditions on site.

Description

technical field [0001] The invention relates to an anchor rod / cable, in particular to a constant-resistance large-deformation anchor rod / cable, which belongs to the field of engineering machinery and the technical field of geotechnical engineering anchoring. Background technique [0002] Anchor rods and anchor cables are the most commonly used anchoring structures in geotechnical engineering, and they are widely used in slope support engineering, tunnel surrounding rock support, mining roadway support and other fields. Traditional bolts / cables are basically rigid structures with little tolerance for deformation. When the quality of the rock mass is poor and the amount of deformation is large, and when dynamic loads such as earthquakes and blasting vibrations act, there are many phenomena that the anchor rod / cable is broken and causes engineering instability and damage. To deal with earthquakes, blasting dynamic loads and large deformations of surrounding rocks, it is a bett...

Claims

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Application Information

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IPC IPC(8): E21D21/00E02D5/74
Inventor 李新坡何思明吴永王东坡罗渝欧阳朝军
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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