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A grouting bonded prestressed yielding anchor rod and its construction method

A technology of letting down the anchor rod and prestressing it, which is used in the installation of anchor rods, infrastructure engineering, earth-moving drilling, etc., can solve the problems of corrosion and durability risks of resin anchoring failure anchor rods

Active Publication Date: 2021-08-24
杭州图强工程材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in a highway tunnel project in western my country, where high ground stress causes large deformation, it is necessary to use yielding anchors with a length of 9m. slurry protection, there is a risk of resin anchorage failure and durability risk of bolt corrosion

Method used

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  • A grouting bonded prestressed yielding anchor rod and its construction method
  • A grouting bonded prestressed yielding anchor rod and its construction method
  • A grouting bonded prestressed yielding anchor rod and its construction method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as Figure 1~3 Shown is the first embodiment of the present invention. The rod body 1 is a multi-strand high-strength steel strand. When in use, the anchor head 80 at the front end of the rod body 1 extends into the bottom of the anchor rod hole 102; , Let the pressure sleeve 2 pass through in the form of a cavity, and then pass out from the inner slide 3 in a force-fitting manner. The inner slide 3 is assembled in the rear cavity of the pressure relief sleeve 2, and the outer part of the pressure relief sleeve 2 is threaded with the lock nut 4, and the lock nut 4 cooperates with the support pad 5 to transmit force to the rock support surface 101 .

[0037] As another force transmission scheme for the backing plate, the rear portion of the pressure sleeve 2 is provided with a pier head, that is, the inner hole of the back portion of the pressure sleeve 2 remains unchanged and the outer diameter side is thick, and the pier head and the support backing plate 5 Coo...

Embodiment 2

[0048] As a description of Embodiment 2 of the present invention, only the differences from Embodiment 1 above will be described below.

[0049] Such as Figure 4 As shown, the rod body 1 adopts a solid rod body, and the solid rod body is a straight long solid rod body, such as a round steel bar or a threaded steel bar. The anchor head connected to the front end of the rod body 1 extends into the bottom of the hole, and the anchoring method is anchoring agent anchoring or expanding shell head anchoring (not shown), both of which are conventional techniques.

[0050] The inner sliding part 3 is a metal short straight cylindrical tube with a smooth outer wall, and the strength and hardness of its material are higher than that of the pressure relief sleeve 2 .

[0051] The working principle of the constant resistance yielding pressure slip of the yielding anchor rod in the present invention is as follows: when the rod body 1 bears a tensile load, it transmits force to the yieldi...

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Abstract

The invention discloses a grouting bonded prestressed yield anchor and a construction method thereof, and relates to the technical field of rock-soil anchorage and engineering support, wherein the yield anchor includes an anchor head, a rod body, a yield sleeve and The backing plate, the front part of the letting pressure sleeve is inserted with a corrugated sleeve; the outside of the back part of the letting pressure sleeve is matched with the supporting backing plate, and an inner slide is arranged inside; the rod body passes through the inner slide, After the compression sleeve and the corrugated sleeve are connected with the anchor head, the force transmission and cooperation between the rod body and the inner slider; the mating surface of the inner slider and the compression sleeve is provided with a plurality of circumferential through holes ; The annular through hole communicates with the pressure letting sleeve and the bellows sleeve respectively. The anchor rod of the invention has the functions of pressure release, prestress, full-length bonding, etc., and is used for permanent engineering support.

Description

technical field [0001] The invention belongs to the technical field of rock-soil anchorage and engineering support, and in particular relates to a grouting bonded prestressed yielding bolt and a construction method thereof. Background technique [0002] A specific pressure-relieving device is installed in the pressure-yielding anchor (cable). When the supported structure undergoes large deformation, the pressure-yielding device can cause the anchor rod (cable) body to deform in accordance with the rock and soil body, so as to avoid anchorage. The rod (cable) fails to break and maintains the supporting function. It is a specific anchor rod that can effectively control complex and changeable large deformation geotechnical engineering that is difficult to support. In recent years, various yield bolts with constant resistance deformation have been continuously developed and applied in slope, underground engineering or mining roadway support engineering to solve the problem of la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D21/00E21D20/02E02D5/74
CPCE02D5/74E21D20/003E21D20/021E21D21/0026
Inventor 吴航通吕志平项小珍王勇周彪汪运来
Owner 杭州图强工程材料有限公司