Device and method for anchor bolt (cable) supporting structure test and anchoring system performance comprehensive experiment

Patent metadata

Field	Value
Publication number	US-10969314-B2
Application number	US-201916976163-A
Country	US
Kind code	B2
Filing date	Dec 19, 2019
Priority date	Jul 5, 2019
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

The present disclosure provides a device and a method for an anchor bolt (cable) supporting structure test and an anchoring system performance comprehensive experiment, and relates to the technical field of anchoring tests. The device includes a gantry, a loading mechanism, a test mechanism and a test piece, wherein the gantry includes a base and an operation platform; the loading mechanism includes a loading frame, a chuck, a surrounding rock force loading oil cylinder and a hollow drawing oil cylinder; the test mechanism includes a load, a displacement and an acoustic emission and other monitoring mechanisms, and the test piece includes a rock test piece, an anchor bolt (cable), an anchor net, and the like; the loading mechanism and the hollow drawing oil cylinder are disposed on the base, and a torsion motor and an anchor bolt drill are disposed on the operation platform, wherein the rock test piece is placed between bearing plates, one end of the anchor bolt (cable) is fixed by the chuck or anchored into the rock test piece, and the other end of the anchor bolt (cable) passes through the hollow drawing oil cylinder. The device is capable of not only testing mechanical properties of the anchor bolt (cable) and an anchoring member, but also realizing simulation of a stress environment of “five sides loaded and one side non-loaded” so as to perform a surrounding rock drilling response or anchoring system performance comprehensive experiment.

First claim

The invention claimed is:

1. A device for an anchor bolt supporting structure test and an anchoring system performance comprehensive experiment comprising a gantry, a loading mechanism, a test mechanism and a test piece, wherein the gantry comprises a base and an operation platform,
the loading mechanism comprises a loading frame, an anchor bolt chuck, a bearing plate, a hollow drawing oil cylinder and a plurality of loading oil cylinders, the loading frame is disposed on a through-groove of the base, the anchor bolt chuck is disposed at an end of the loading frame, and the loading oil cylinder is disposed at a side surface of the loading frame and acts on the bearing plate; the hollow drawing oil cylinder is disposed at an end of the loading frame and opposite to the anchor bolt chuck;
the test mechanism comprises a stress sensor and a displacement sensor, an acoustic emission probe, a torsion motor and an anchor bolt drill, the torsion motor and the anchor bolt drill are both disposed on the operation platform, the stress sensor and the displacement sensor are disposed on the bearing plate, and the acoustic emission probe is disposed on the loading frame;
the test piece comprises a steel strip, an anchor net, a tray, and a test anchor bolt, one end of the test anchor bolt is fixed at a side of the loading frame, and the other end of the test anchor bolt passes through the hollow drawing oil cylinder; wherein the hollow drawing oil cylinder is disposed on a door plate hinged with a connection support, and an anchor net fixing hole and a steel strip fixing hole are further disposed on the connection support; a hollow bearing plate is disposed at a loading end of the hollow drawing oil cylinder, the anchor net is pressed onto the hollow bearing plate, and the steel strip and the tray are pressed onto the anchor net sequentially.

2. The device according to claim 1 , wherein the through-groove is disposed at an upper surface of the base, and a depth of the through-groove is greater than an exposed length of the installed loading oil cylinder; the operation platform is disposed opposite to the base, a sliding rail is disposed at an upper surface of the operation platform, a sliding block moves along the sliding rail in cooperation with the sliding rail, a sliding groove is further disposed at an upper surface of the sliding block, the anchor bolt drill and the torsion motor move along the sliding groove respectively or are fixed on the sliding groove, and sliding rollers are further disposed at both sides of the sliding grooves.

3. The device according to claim 1 , wherein the loading frame comprises one or more dual-shaft frames, and two groups of loading oil cylinders distributed vertically and correspondingly are disposed on the dual-shaft frame to apply a load in a plane determined by the dual-shaft frame; an axial hollow loading oil cylinder is further disposed on the dual-shaft frame on which the anchor bolt chuck is connected along an axial direction of the test anchor bolt; four corners of the dual-shaft frames are connected through pillars and nuts, the bearing plate comprises a shear bearing plate and a plane bearing plate, and a loading end of the loading oil cylinder is connected to the shear bearing plate or the plane bearing plate.

4. An anchor bolt detection method using the device for an anchor bolt supporting structure test and an anchoring system performance comprehensive experiment according to claim 3 , comprising steps of: firstly, fixing one end of the test anchor bolt on the anchor bolt chuck, and fixing the other end of the test anchor bolt on the hollow bearing plate through the nut and the tray; and then, performing axial loading by the hollow drawing oil cylinder, and recording a force and a deformation of the anchor bolt in the loading process.

5. An anchor bolt detection method using the device for an anchor bolt supporting structure test and an anchoring system performance comprehensive experiment according to claim 3 , comprising steps of: firstly, connecting the shear bearing plate to the loading end of the loading oil cylinder, fixing one end of the test anchor bolt on the anchor bolt chuck, and adjusting a position of the shear bearing plate through the loading oil cylinder to engage the shear bearing plate with the test anchor bolt; then, fixing the other end of the test anchor bolt on the hollow bearing plate through the nut and the tray; and then, performing loading by the loading oil cylinder, and recording a force and a deformation of the anchor bolt in the loading process.

6. The device according to claim 1 , wherein an acoustic emission probe installation groove is disposed at an inner side of the loading frame, and the displacement sensor and the force sensor are disposed on the bearing plates; torque, power and thrust monitoring devices are disposed on the anchor bolt drill, and a drilling scrap collection device is further disposed at a drilling side of the anchor bolt drill.

7. The device according to claim 3 , wherein the test piece further comprises a rock test piece, the rock test piece is placed in a space enclosed by the plane bearing plates, and the shear bearing plate is staggeredly engaged with the test anchor bolt.

8. A method of testing a bolt-net combined supporting performance using the device for an anchor bolt supporting structure test and an anchoring system performance comprehensive experiment according to claim 7 , comprising the following steps:
at step A, installing the plane bearing plate on the loading end of the loading oil cylinder, transporting the rock test piece to a loading space between the plane bearing plates, and adjusting the loading oil cylinders and the axial hollow loading oil cylinder to clamp the rock test piece;
at step B, opening the door plate where the hollow drawing oil cylinder is located, fixedly installing the anchor bolt drill on the operation platform, and adjusting the loading oil cylinders and the axial hollow loading oil cylinder to perform loading respectively so as to simulate actual geostress;
at step C, starting the anchor bolt drill to drill a drill hole along an axial direction of the rock test piece relative to a central hole of the anchor bolt chuck, and recording a torque, a rotation speed, a power, a thrust and a drilling speed of the anchor bolt drill and a deformation of the rock test piece in the drilling process;
at step D, retreating a drill rod after drilling is completed, closing the door plate where the hollow drawing oil cylinder is located, and directing the test anchor bolt and an anchoring agent into the drill hole simultaneously;
at step E, after the anchoring agent is solidified, applying a pretightening force to the anchor bolt, and installing the steel strip, the anchor net and the tray; and
at step F, simulating the force and deformation of the anchor bolt when surrounding rocks are disturbed by adjusting the loading oil cylinders; or testing a combined supporting capacity of the anchor bolt, the anchor net and the steel strip by performing loading with the hollow drawing oil cylinder; at the same time, recording force and deformation of the steel strip, the anchor net, the tray, the anchor bolt and the rock test piece in the loading process.

9. An anchor bolt detection method using the device for an anchor bolt supporting structure test and an anchoring system performance comprehensive experiment according to claim 1 , comprising steps of: firstly, fixing one end of the test anchor bolt on the anchor bolt chuck, opening the door plate where the hollow drawing oil cylinder is located, and fixedly installing the torsion motor on the operation platform; then, fixing the other end of the test anchor bolt on the torsion motor of the opera

Assignees

• Univ Shandong Science & Tech

Inventors

• Zhao Tongbin
• Li Chunlin
• Xing Minglu
• Tan Yunliang
• Zhao Chen
• Wang Zhi
• Li Xiaoliang
• Yu Fenghai
• Jia Jinglong

Classifications

• E21D20/00 Primary

  Setting anchoring-bolts (anchoring bolts for shafts, tunnels or galleries E21D21/00; means for anchoring structural elements or bulkheads specially adapted to foundation engineering E02D5/74; dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose F16B13/00) · CPC title

• G01N3/22

  by applying steady torsional forces (G01N3/26, G01N3/28 take precedence) · CPC title

• G01N2203/0048

  Hydraulic means · CPC title

• G01N3/24

  by applying steady shearing forces (G01N3/26, G01N3/28 take precedence) · CPC title

• G01N2203/0017

  Tensile · CPC title