Prestressed anchor rods with anti-openings to prevent pulling out of anchor holes

A prestressing and anchoring technology, which is applied in the installation of anchors, sheet pile walls, mining equipment, etc., can solve the problem of not being able to adapt to the immediate support of weak rock and soil, restricting the application and development of rock and soil anchoring technology, and reducing the anchoring force, etc. problem, to achieve the effect of improving the load transfer mechanism and optimizing the load transfer mechanism

Inactive Publication Date: 2015-10-28
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the construction and operation of rock-soil anchorage, the pulling out of the anchor rod together with the grouting body from the anchor hole is the most basic, typical and common form of rock-soil anchorage failure, which will lead to the failure of rock-soil anchorage and endanger the safety of the project. Bring hidden dangers, thereby limiting the anchoring force that the bolt can provide
Therefore, when the anchoring force required by the rock and soil mass is large, ordinary bolt anchoring can no longer meet the requirements of the project, which restricts the application and development of rock and soil anchoring technology. How to improve the load transfer mechanism of rock and soil anchoring and overcome the common It has become the fundamental way to increase the anchoring force of the bolt and improve the anchoring effect.
[0005] In addition, the grouting body can hardly provide anchoring force in the early stage of anchoring, so it cannot meet the requirements of immediate support after excavation of weak rock and soil
Although the existing pipe-slit bolts overcome the above-mentioned shortcomings, the anchoring force can be provided immediately after the bolt is installed, which is beneficial to timely control the deformation of the rock and soil mass, but the anchoring force that can be provided is not large; at the same time, due to the weak The rock and soil will squeeze into the pipe cavity from the pipe seam of the pipe seam anchor, resulting in a decrease in the anchoring force

Method used

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  • Prestressed anchor rods with anti-openings to prevent pulling out of anchor holes
  • Prestressed anchor rods with anti-openings to prevent pulling out of anchor holes
  • Prestressed anchor rods with anti-openings to prevent pulling out of anchor holes

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1 When in use, (1) drill hole 3 on rock and soil body 1 according to the design requirements, and carry out the construction of pad 5 at the mouth of hole 3; Then the top 8 of the anchor rod body 4 passes through the anchor rod hole 16 at the bottom until the expansion tooth bowl 10 is pushed to the bottom end of the anchor rod body 4, so that the conical side of the expansion plug 9 and the inner surface of the expansion tooth bowl 10 teeth 11 (3) place the expansion tooth bowl 10 together with the anchor rod body 4 at the bottom of the borehole 3; (4) by applying a thrust downward along the axial direction of the anchor rod body 4 to the upper end of the round tube sleeved on the anchor rod body 4, and simultaneously The anchor rod body 4 axially applies an upward pulling force to the upper end of the anchor rod body 4, so that the frustum-shaped expansion plug 9 carried by the bottom end of the anchor rod body 4 approaches the bottom of the expansion tooth b...

Embodiment 2

[0033] Example 2 When in use, (1) drill hole 3 on rock and soil body 1 according to the design requirements, and carry out the construction of pad 5 at the mouth of hole 3; Make the top 8 of the anchor rod body 4 pass through the anchor rod hole 16 at the bottom until the expansion tooth bowl 10 is pushed to the bottom end of the anchor rod body 4, so that the conical side of the expansion plug 9 coincides with the inner surface of the teeth 11 of the expansion tooth bowl 10 ; (3) place the expansion tooth bowl 10 together with the anchor rod body 4 at the bottom of the borehole 3; (4) adopt a circular tube shorter than the anchor rod body 4, and put it on the anchor rod body 4, that is, the lower end of the circular tube is on the opposite side. On the bottom of the expansion tooth bowl 10 at the mouth, and then add a backing plate 6 on the top 8 of the anchor rod, that is, even if the top 8 of the anchor rod passes through the anchor hole in the center of the backing plate ...

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PUM

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Abstract

The invention relates to a prestress anchor rod with an inverted opening and prevented from being pulled out from an anchor hole. The prestress anchor rod comprises an anchor rod body with an expansion plug at the bottom, and the center of the bottom is provided with an expansion tooth bowl of an anchor rod hole I, a pad seat, an inserted plate and a nut. The pad seat and the inserted plate are respectively provided with an anchor rod hole II, the top of the anchor rod body sequentially penetrates through the anchor rod hole I and the anchor rod holes II of the pad seat and the inserted plate to be connected with the nut, and the expansion plug is disposed in the expansion tooth bowl. The prestress anchor rod is simple in structure, low in cost and convenient to construct, a novel tension-pressure-bolt plug composite prestress anchoring system is built, the anchor rod can be prevented from being pulled out from the anchor hole along with grouting, and stability of rock and earth mass, engineering safety and anchoring durability are improved.

Description

technical field [0001] The invention relates to rock-soil anchoring technology, in particular to a prestressed anchor rod which is reversed and prevented from being pulled out from an anchor hole. Background technique [0002] At present, rock and soil anchoring is through the anchor bolt buried in the stratum, which tightly interlocks the stratum, and relies on the interaction of anchor bolt-grouting body-hole wall rock and soil physical force to mobilize and improve the self-strength of the rock and soil mass and self-stabilizing ability to improve the stress state and ensure the stability of the external rock and soil mass, thereby ensuring the technology of engineering safety. The engineering application of geotechnical anchoring technology began at the end of the 19th century. With the development of its theory and technology, it has been extended to mines, water conservancy, hydropower, highways, railways, municipal administration, urban construction, geology, military...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D21/00E02D5/74
Inventor 言志信江平曾明正
Owner LANZHOU UNIVERSITY
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