Recoverable mechanical pre-stressed anchor rod, as well as installation and recovery method thereof

A prestressed, mechanical technology, applied in the direction of installation of anchor rods, earthwork drilling, sheet pile walls, etc., can solve the problems that the anchoring effect needs to be improved, difficult to recycle, etc., to overcome the lack of anchoring force, good anchoring effect, and anchoring powerful effect

Pending Publication Date: 2019-11-19
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 mechanically prestressed anchor rod with large anchoring force and recoverab...

Method used

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  • Recoverable mechanical pre-stressed anchor rod, as well as installation and recovery method thereof
  • Recoverable mechanical pre-stressed anchor rod, as well as installation and recovery method thereof
  • Recoverable mechanical pre-stressed anchor rod, as well as installation and recovery method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In this embodiment, the structural schematic diagram of the recoverable mechanical prestressed anchor rod is as follows figure 1 As shown, it includes a screw 1 , a fixing nut 2 , a tray 3 , a first anchor 4 , two second anchors 5 , and a sleeve 6 .

[0046] The screw 1 includes a first threaded section 1-1, a second threaded section 1-2 and a non-threaded section 1-3, the first threaded section 1-1 is opposite to the thread direction on the second threaded section 1-2, specifically Ground, the first thread segment is a left-handed thread segment, the second thread segment is a right-handed thread segment, the unthreaded segment 1-3, the first threaded segment 1-1 and the second threaded segment 1-2 are connected in sequence, and the unthreaded segment 1 The end of -3 is provided with snap connector 7, such as image 3 As shown, the snap joint 7 is composed of a snap joint body 7-1 and a snap joint neck 7-2. Both the snap joint body and the snap joint neck are cylindri...

Embodiment 2

[0052] In this embodiment, the structural schematic diagram of the recoverable mechanical prestressed anchor rod is as follows figure 2 As shown, it includes a screw 1 , a fixing nut 2 , a tray 3 , a first anchor 4 , a second anchor 5 , a sleeve 6 and an anchor plate 13 .

[0053] The screw 1 includes a first threaded section 1-1, a second threaded section 1-2 and a non-threaded section 1-3, the first threaded section 1-1 is opposite to the thread direction on the second threaded section 1-2, specifically Ground, the first thread segment is a left-handed thread segment, the second thread segment is a right-handed thread segment, the unthreaded segment 1-3, the first threaded segment 1-1 and the second threaded segment 1-2 are connected in sequence, and the unthreaded segment 1 The end of -3 is provided with snap connector 7, such as image 3 As shown, the snap joint 7 is composed of a snap joint body 7-1 and a snap joint neck 7-2. Both the snap joint body and the snap joint ...

Embodiment 3

[0060] In this embodiment, the installation and recovery method of the retrievable mechanical prestressed anchor described in embodiment 1 is provided, and the steps are as follows:

[0061] ① Drill the borehole 16 in the surrounding rock, and select a retrievable mechanical prestressed bolt with an appropriate size according to the size of the borehole.

[0062]②Adjust the angle between the upper support and the lower support of the first anchor and the second anchor so that the tops of each support unit just protrude from the first strip hole and the second strip hole, and then insert the Recover the mechanical prestressed anchor rod and put it into the borehole so that the first base is against the bottom of the borehole, and the screw clockwise turns the screw to drive the first push nut and the second push nut to move towards the bottom of the borehole and drive the top to move towards the borehole wall , until the prestress is generated by the contact between the plug an...

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Abstract

The invention provides a recoverable mechanical pre-stressed anchor rod which comprises a screw rod, a first anchoring parts, a second anchoring parts and a sleeve pipe. The screw rod comprises a first threaded section, a second threaded section and an unthreaded section connected sequentially; the first anchoring parts comprises a first base, a first driving nut and a support unit; the second anchoring parts comprises a second base, a second driving nut and a support unit; each support unit comprises an upper support piece, a lower support piece and an ejector header; a clamping groove is formed in the first base; the second base is fixed onto the inner wall of the sleeve pipe; a strip-shaped hole is formed in the sleeve pipe; the first driving nut and the second driving nut are arrangedon the first threaded section; the first threaded section penetrates through an installation through hole of the second base; a clamping head of the screw rod is clamped into the clamping groove; thescrew rod can be limited to only rotate around the axis of the screw rod; and by rotating the screw rod, the distance between the ejector header of each support unit and the drill hole wall can be adjusted. The invention further provides an installation and recovery method of the anchor rod. The anchor rod is large in anchoring force and can solve the problems that an existing anchor rod is difficult to recycle.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering support, and relates to a retrievable mechanical prestressed bolt and a method for installing and retrieving the same. 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 installed inside the surrounding rock, the anchor rod is used for the support of open-air slopes, underground caverns, shaft engineering and building foundation pits. When performing bolt support, firstly drill a hole in the surroun...

Claims

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Application Information

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IPC IPC(8): E21D21/00E21D20/00E02D5/74E02D5/76
CPCE02D5/74E02D5/765E02D2250/0046E02D2600/30E21D20/003E21D21/0033E21D21/008
Inventor 徐奴文毛浩宇李彪马克周靖人
Owner SICHUAN UNIV
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