Anchor rod end cavity enlarging device and construction method thereof

A bolt and cavity expander technology, which is applied in the installation of bolts, earthwork drilling, drilling equipment, etc., can solve the problems of limited capacity of cylindrical holes, and achieve the effects of improved anchoring capacity, volume expansion, and volume increase

Inactive Publication Date: 2016-08-17
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the anchoring capacity of the anchoring end of the anchor rod, the shape of the anchoring end of the anchor rod can be designed. The cylindrical hollow hole formed by traditional drilling has limited capacity

Method used

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  • Anchor rod end cavity enlarging device and construction method thereof
  • Anchor rod end cavity enlarging device and construction method thereof
  • Anchor rod end cavity enlarging device and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Such as Figure 1-9 As shown, a device for expanding the cavity at the end of the anchor rod includes a head cavity expansion device 1, a middle rod body 2, a casing 3 and a middle converter 4; the middle rod body 2 is a hollow cylindrical rod body, and the head cavity expansion device The device 1 and the middle converter 4 are connected by welding; the surface of the casing 3 is provided with external threads, and the head cavity expander 1 and the middle rod body 2 are both provided with external threads on the surface of the casing 3. internal thread, the sleeve 3 is threadedly connected with the head reamer 1 and the middle rod body 2 .

[0049] The top of the head expander 1 is provided with two symmetrically distributed expander injection ports 11 .

[0050] The head expander 1 is provided with several symmetrically distributed cylindrical expander water inlet channels 5; different cavity expander water inlet channels 5 are designed according to different surrou...

Embodiment 2

[0064] On the basis of the above-mentioned embodiment, in the weak surrounding rock with a buried depth of 300m and a surrounding rock grade of Class IV, develop a semicircular arch roadway with a straight wall, the maximum distance between the roof and the bottom plate is 3.8m, and drill a hole in the middle of the roof. Deep 2m, borehole diameter 60mm, the invention provides a kind of construction method (such as Figure 10 As shown), it is used to realize the formation of a stable anchoring body with a large volume at the end of the anchor rod, wherein, the steps are as follows:

[0065] Step 1: After drilling the drill pipe according to the design requirements, design the head reamer of the reaming device at the end of the anchor rod. When it is fully expanded, its horizontal length is 120mm. When it is fully contracted, its The horizontal length is 40mm; put the expansion device at the end of the anchor rod into the hole until it is placed at the bottom; then add an exter...

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Abstract

The invention discloses an anchor rod end cavity enlarging device and a construction method thereof and belongs to the field of machines. The anchor rod end cavity enlarging device comprises a head cavity enlarger, a middle rod body, a casing pipe and a middle converter. The middle rod body is connected with the head cavity enlarger and the middle converter in a welded manner. The casing pipe is connected with the head cavity enlarger and the middle rod body through threads. The size of the anchoring end of an anchor rod is expanded in the horizontal direction through the anchor rod end cavity enlarging device, so that the suspending capacity of the anchoring end is effectively improved. A whole set of construction method for using the anchor rod for grouting to reinforce surrounding rock is designed in cooperation with the anchor rod end cavity enlarging device, the supporting capacity for dealing with the soft surrounding rock is effectively improved, and finally safety and stability of underground engineering are guaranteed.

Description

technical field [0001] The invention belongs to the field of machinery, and in particular relates to a cavity expansion device at the end of an anchor rod and a construction method thereof. Background technique [0002] In the excavation process of underground engineering, the surrounding rock should be supported in time after excavation, and the surrounding rock shows diversity and particularity, which greatly increases the difficulty of support, especially for the support of weak surrounding rock. The rock is poor in integrity, easy to weather, and easy to swell and disintegrate when exposed to water. Due to the action of groundwater, the surrounding rock will swell and disintegrate in a water or humid environment, and the self-stabilization ability is greatly reduced. In this case, , the anchoring end of the ordinary bolt tends to lose its anchoring ability gradually, making the surrounding rock in an extremely unstable environment, and even dangerous situations such as r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D21/00E21D20/02E21B10/32E21B10/60
CPCE21B10/325E21B10/327E21B10/602E21D20/003E21D20/021E21D21/0026E21D21/0033
Inventor 宋伟杰乔卫国林登阁宋雪梅李伟吴多华
Owner SHANDONG UNIV OF SCI & TECH
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