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Prestress grouted rock bolt and installing and recycling method thereof

A prestressing and anchoring technology, which is applied in the installation of anchors, earthwork drilling, sheet pile walls, etc., can solve the problems of difficult recycling, inability to adapt to the purpose of support, and the need to improve the anchoring effect, so as to achieve large anchoring force, Good anchoring effect

Pending Publication Date: 2019-12-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a prestressed grouting anchor with large anchoring force, recyclable, and adaptable to different anchoring purposes and its installation and recovery method, so as to solve the existing anchoring effect of the existing anchor. Improvement, difficulty in recycling and inability to adapt to different support purposes

Method used

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  • Prestress grouted rock bolt and installing and recycling method thereof
  • Prestress grouted rock bolt and installing and recycling method thereof
  • Prestress grouted rock bolt and installing and recycling method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] In this embodiment, the structural diagram of the prestressed grouting anchor is as follows figure 1 As shown, it includes a hollow screw 1 , a fixing nut 2 , a tray 3 , a grout stopper 4 , an anchor 5 and an installation sleeve 6 .

[0045] The hollow screw 1 includes a first threaded section 1-1, a second threaded section 1-2 and a non-threaded section 1-3, and an end is provided between the first threaded section 1-1 and the second threaded section 1-2. A blank segment with thread, the thread direction of the first thread segment 1-1 and the second thread segment 1-2 are opposite, specifically, the first thread segment is a left-handed thread segment, the second thread segment is a right-handed thread segment, and the second thread segment is a right-handed thread segment. One end of a threaded section is connected to the unthreaded section 1-3, and the end of the unthreaded section is provided with a clip joint 7. Such as Figure 5 As shown, the snap joint 7 is co...

Embodiment 2

[0050] In this embodiment, the structural diagram of the prestressed grouting anchor is similar to figure 1 , including a hollow screw 1, a fixing nut 2, a tray 3, a grout stopper 4, an anchor 5 and an installation sleeve 6,

[0051] The hollow screw 1 includes a first threaded section 1-1, a second threaded section 1-2 and a non-threaded section 1-3, and an end is provided between the first threaded section 1-1 and the second threaded section 1-2. A blank segment with thread, the thread direction of the first thread segment 1-1 and the second thread segment 1-2 are opposite, specifically, the first thread segment is a left-handed thread segment, the second thread segment is a right-handed thread segment, and the second thread segment is a right-handed thread segment. One end of a threaded section is connected to the unthreaded section 1-3, and the end of the unthreaded section is provided with a clip joint 7. Such as Figure 5 As shown, the snap joint 7 is composed of a sna...

Embodiment 3

[0056] In this embodiment, the installation and recovery method of the prestressed grouting anchor described in embodiment 1 or 2 is provided, and the steps are as follows:

[0057] ① Drill the borehole 11 in the surrounding rock, and select the prestressed grouting bolt with the appropriate size according to the size of the borehole;

[0058] ② Put the installation sleeve on the hollow screw with the anchor installed, adjust the angle between the upper support and the lower support so that the top of the anchor protrudes from the limit groove of the installation sleeve and put it in After drilling, the plug does not touch the wall of the drilled hole, such as Figure 7 As shown, then put the installation sleeve into the drill hole so that the support feet on the base of the anchor and the installation sleeve are against the bottom of the drill hole so that the axis of the hollow screw coincides with the axis of the drill hole, fix the installation sleeve, and turn clockwise ...

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Abstract

The invention provides a prestress grouted rock bolt which comprises a hollow screw rod, an anchoring element and an installing sleeve pipe, wherein the hollow screw rod comprises a first threaded section, a second threaded section and a threadless section; a clamping connector is arranged at the end part of the hollow screw rod; a grouting passage is formed inside the hollow screw rod; the anchoring element comprises a base, a pushing screw nut and at least three support units; each support unit comprises an upper support element, a lower support element and a jacking head; a clamping connection groove is formed in the base; the pushing screw nut is arranged on the first threaded section; the clamping connection groove is clamped and connected onto the clamping connector; the hollow screwrod is limited to be only capable of rotating around an axial line of the hollow screw rod; the installing sleeve pipe is connected outside the hollow screw rod of the anchoring element in a sleevingway; ejection ends extend out from the position limiting groove of the installing sleeve pipe; and the rotating hollow screw rod can drive the pushing screw nut to move on the first threaded section,so that the distance between the ejection end of each support unit and the drill hole wall is regulated. The invention also provides an installing and recycling method of the prestress grouted rock bolt. The prestress grouted rock bolt has great anchoring force, can be recycled and can achieve different anchoring goals.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering support, and relates to a prestressed grouting bolt and its installation and recovery method. Background technique [0002] With the continuous development of underground engineering in my country, the theory and technology of surrounding rock control in deep engineering are of great significance to ensure the safety, efficient construction and production of deep underground engineering. The most effective way to control underground surrounding rock is to drill Therefore, the anchor rod plays a decisive role in ensuring the safety of underground engineering construction. [0003] As a support member made of high tensile strength material (such as steel) installed inside the surrounding rock, the anchor rod is used for the support of open-air slopes, underground caverns, well engineering and building foundation pits. . When carrying out bolt support, firstly drill a hole in the surrounding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D21/00E21D20/00E21D20/02E02D5/74
CPCE21D21/0026E21D21/0093E21D20/003E21D20/02E02D5/74
Inventor 徐奴文毛浩宇李彪马克周靖人
Owner SICHUAN UNIV
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