Roadway surrounding rock stress monitoring device

Abstract

The utility model discloses a roadway surrounding rock stress monitoring device, which comprises a fixing assembly, the fixing assembly comprises a fixing cylinder and a plurality of groups of connecting pieces movably inserted on the upper circumferential surface of the fixing cylinder, strain gauges are placed in placing grooves of the connecting pieces, and then the fixing assembly is inserted into a drill hole, so that the stress of the roadway surrounding rock is monitored, and the stress of the roadway surrounding rock is monitored. Then the position of the fixing assembly is adjusted, the pushing piece is driven to be opened, one end of the pushing piece pushes the strain gauge out of the containing groove, the outer side of the strain gauge is coated with the binder, the strain gauge can be attached to the hole wall under pushing of the pushing piece, the strain gauge can be attached to the designated position, and under the action of the binder, the strain gauge can be fixed. The strain gauge and the hole wall are firmly fixed together, and the strain gauge and the connecting piece are easy to separate, so that the problem that the strain gauge is damaged due to viscosity residue, tearing during separation and the like is solved compared with a mode of bonding the strain gauge to the air bag, and the monitoring accuracy of the strain gauge is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to stress monitoring technical field especially relates to a roadway surrounding rock stress monitoring device. BACKGROUND

[0002] Because the lane (tunnel) is excavated very generally, such as coal mine roadway, railway highway tunnel, subway passage and the like, due to the different geological conditions in each place, the stress of underground roadway surrounding rock is very different, and the roadway appears different conditions under the action of various forces, if the roadway surrounding rock stress can be monitored well, the roadway support can be targeted according to the different monitoring results.

[0003] The Chinese patent with publication number CN209372271U discloses a roadway surrounding rock stress monitoring device, which bonds the strain gauge to the air bag by using weak strength glue, coats the outer surface of the strain gauge with high-strength adhesive, and then controls the air pump to work through the electric control module to drive the air bag to expand, so that the strain gauge and the wire harness fixing frame are tightly attached to the hole wall of the surrounding rock, and after the adhesive is firmly bonded to the hole wall, the air bag is contracted, and the strain gauge and the wire harness fixing frame are installed on the hole wall, but since there is adhesive between the strain gauge and the air bag, when the strain gauge and the air bag are separated and torn, the strain gauge may be damaged, thereby affecting the accuracy of monitoring. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies in the prior art, the utility model provides the following technical scheme:

[0005] A roadway surrounding rock stress monitoring device comprises.

[0006] The fixing assembly comprises a fixing cylinder and a plurality of connecting pieces movably inserted into the circumferential surface of the fixing cylinder, a placing groove is formed in each connecting piece, a pusher corresponding to each connecting piece in position and number is slidably arranged in the fixing cylinder, one end of each pusher penetrates through the corresponding connecting piece and extends into the placing groove of the connecting piece, and the plurality of pushers are driven to reciprocally move along the radial direction of the fixing cylinder so as to fold or unfold the plurality of pushers.

[0007] The monitoring piece comprises a strain gauge placed in the placing groove and a data acquisition module electrically connected to the strain gauge, the outer side of the strain gauge is coated with adhesive, the pushers are driven to unfold, the strain gauge is pushed out of the placing groove and attached to the hole wall, and the strain gauge is fixed to the hole wall under the action of the adhesive; when the hole wall is deformed under the action of external pressure, the deformation amount is collected and stored by the data acquisition module through the strain gauge.

[0008] As the improvement of the above technical scheme, the connecting piece comprises a connecting rod movably inserted into the sidewall of the fixed cylinder, one end of the connecting rod is fixedly provided with a fixed plate, the placing groove is arranged on the side of the fixed plate away from the connecting rod, the inside of the connecting rod is communicated with the placing groove, and the surface of the connecting rod between the fixed cylinder and the fixed plate is provided with spring one.

[0009] As the improvement of the above technical scheme, the strain gauge is electrically connected with a wire harness fixing frame through a signal line, the wire harness fixing frame is electrically connected with the data acquisition module through a wire harness, and the fixed plate is provided with an opening for the movement of the signal line.

[0010] As the improvement of the above technical scheme, the pushing piece comprises a moving rod movably inserted into the connecting rod, the bottom of the moving rod is fixedly connected with a wedge-shaped block, spring two is arranged between the wedge-shaped block and the inner wall of the fixed cylinder, and the side, away from the spring two, of the wedge-shaped block is provided with an inclined portion.

[0011] As the improvement of the above technical scheme, a plurality of wedge-shaped blocks are arranged in a region surrounded by the wedge-shaped blocks, and a conical body is arranged in the region, the bottom of the conical body is fixedly provided with a fixed rod, the conical body is driven to move in the axial direction of the fixed cylinder to press the inclined portion of the moving block wedge-shaped block, so as to drive the moving rod to move in the radial direction of the fixed cylinder.

[0012] The beneficial effects of the present application are as follows:

[0013] The strain gauge is placed in the placing groove of the connecting piece, then the fixed assembly is inserted into the drill hole, then the position of the fixed assembly is adjusted, and then the pushing piece is driven to be opened, one end of the pushing piece pushes the strain gauge out of the placing groove, the outer side of the strain gauge is coated with an adhesive, under the pushing of the pushing piece, the strain gauge is pasted to the hole wall, the strain gauge can be pasted to the specified position, under the action of the adhesive, the strain gauge and the hole wall are firmly fixed together, and the strain gauge and the connecting piece are easily separated, compared with being adhered to the air bag, the strain gauge will not be damaged due to adhesive residue, tearing during separation and the like, and the accuracy of strain gauge monitoring is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a front view of the overall structure of the present application.

[0015] Figure 2 It is a sectional view of the fixed assembly of the present application.

[0016] Figure 3 It is a structural schematic view of the fixed plate of the present application.

[0017] Figure 4 It is a structural schematic view of the monitoring piece of the present application.

[0018] 10, wire harness fixing frame; 11, wire harness; 12, data acquisition module; 13, strain gauge; 20, fixing cylinder; 21, fixing plate; 211, placing groove; 212, opening; 22, fixing column; 23, connecting rod; 24, spring I; 25, moving rod; 251, wedge-shaped block; 26, fixed rod; 261, conical body; 27, spring II. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0020] A roadway surrounding rock stress monitoring device, comprising,

[0021] The fixing assembly comprises a fixing cylinder 20 and a plurality of groups of connecting pieces movably inserted into the circumferential surface of the fixing cylinder 20, the connecting pieces are provided with placing grooves 211, the fixing cylinder 20 is internally slidably provided with pushers corresponding in position and number to the connecting pieces, one end of the pusher penetrates through the connecting piece and extends into the placing groove 211 of the connecting piece, and the plurality of pushers are driven to reciprocate along the radial direction of the fixing cylinder 20 so as to be folded or unfolded.

[0022] The monitoring piece comprises a strain gauge 13 placed in the placing groove 211 and a data acquisition module 12 electrically connected to the strain gauge 13, the outer side of the strain gauge 13 is coated with an adhesive, the pusher is driven to be unfolded, the strain gauge 13 is pushed out of the placing groove 211, the strain gauge is attached to the hole wall, the strain gauge 13 is fixed to the hole wall under the action of the adhesive, when the hole wall is deformed under the action of external pressure, the deformation amount is collected and stored by the data acquisition module 12 through the strain gauge.

[0023] Specifically, referring to Figure 1 and Figure 2, the monitoring device is placed into the borehole of the surrounding rock, the strain gauge 13 is installed on the borehole wall, the deformation of the borehole wall is monitored, the purpose of monitoring the stress of the surrounding rock of the roadway is achieved, the strain gauge 13 is first placed in the placing groove 211 of the connecting piece, then the fixing assembly is inserted into the borehole, then the position of the fixing assembly is adjusted, then the driving member is driven to expand, one end of the driving member pushes the strain gauge 13 out of the placing groove 211, the outer side of the strain gauge 13 is coated with an adhesive, under the pushing of the driving member, the strain gauge 13 is attached to the borehole wall, the strain gauge 13 can be attached to the specified position, under the action of the adhesive, the strain gauge 13 is firmly fixed with the borehole wall, when the stress of the surrounding rock of the roadway changes, the strain gauge 13 converts the deformation amount into an electrical signal and transmits the electrical signal to the data acquisition module 12, the data acquisition module 12 collects and stores data, the stress of the surrounding rock of the roadway is monitored, and the problem that the strain gauge 13 is lost after being separated from the fixing assembly can be effectively avoided.

[0024] In one embodiment, the connecting piece includes a connecting rod 23 movably inserted into the side wall of the fixing cylinder 20, a fixed plate 21 is fixedly arranged at one end of the connecting rod 23 away from the fixing cylinder 20, the placing groove 211 is arranged on the side of the fixed plate 21 away from the connecting rod 23, the inside of the connecting rod 23 communicates with the placing groove 211, and a spring 24 is arranged on the surface of the connecting rod 23 between the fixing cylinder 20 and the fixed plate 21.

[0025] Specifically, referring to Figure 2 and Figure 3 Before the fixing assembly is inserted into the borehole, a plurality of fixed plates 21 are moved in the direction of approaching each other, the volume of the entire fixing assembly is reduced, and the fixing assembly is easily inserted into the borehole, after the fixing assembly is inserted, the fixed plates 21 are loosened, under the restoring force of the spring 24, the fixed plates 21 are moved in the direction away from each other, the spring 24 pushes the fixed plates 21 to return to the original position, so that the fixed plates 21 are attached to the inner wall of the borehole, and since the fixed plates 21 are in a stable position, the strain gauge 13 is easily attached to the inner wall of the borehole, when the fixing assembly needs to be taken out, the fixed plates 21 are pushed in the direction of approaching each other, the volume of the entire fixing assembly is reduced, and the fixing assembly is easily taken out.

[0026] In one embodiment, the strain gauge 13 is electrically connected with a wire harness fixing frame 10 through a signal line, the wire harness fixing frame 10 is electrically connected with the data acquisition module 12 through a wire harness 11, and an opening 212 for the movement of the signal line is arranged on the fixed plate 21.

[0027] Specifically, referring to Figure 1 and Figure 4The signal line of the strain gauge 13 is electrically connected with the wire harness 11 of the data acquisition module 12 through the wire harness fixing frame 10, so as to facilitate signal transmission. The opening 212 can make the signal line enter, so as to avoid that the signal line is blocked or extruded by the fixing plate 21 and the inner wall of the drill hole when the fixing assembly enters the drill hole, and facilitate installation or disengagement of the strain gauge 13 and the fixing assembly.

[0028] In one embodiment, the pushing member includes a moving rod 25 movably inserted into the connecting rod 23, the bottom of the moving rod 25 is fixedly connected with a wedge block 251, a spring 27 is arranged between the wedge block 251 and the inner wall of the fixed cylinder 20, and an inclined portion is arranged on the side of the wedge block 251 away from the spring 27; a conical body 261 is arranged in the area enclosed by a plurality of wedge blocks 251, the bottom of the conical body 261 is fixedly provided with a fixed rod 26, the conical body 261 is driven to move in the axial direction of the fixed cylinder 20 to extrude the inclined portion of the moving block wedge block 251, so as to drive the moving rod 25 to move in the radial direction of the fixed cylinder 20.

[0029] Specifically, by applying an upward force to the fixed rod 26, the fixed rod 26 pushes the conical body 261 to move upward in the axial direction of the fixed cylinder 20, the conical body 261 extrudes the inclined portion of the wedge block 251 during movement, the wedge block 251 is extruded by the conical body 261 and starts to move in the radial direction away from the conical body 261 and extrudes the spring 27, the wedge block 251 drives the moving rod 25 to move in the radial direction of the fixed cylinder 20 together, the moving rod 25 contacts the strain gauge 13, until the moving rod 25 pushes the strain gauge 13 out of the placement groove 211 and makes it adhere to the hole wall, and then stress monitoring work is started. When the strain gauge 13 is pasted, the fixed assembly needs to be retracted, the fixed rod 26 is pulled downward, the fixed rod 26 drives the conical body 261 to move downward, under the restoring force of the spring 27, the wedge block 251 is pushed to move in the direction of approaching each other, so that the wedge block 251 and the moving rod 25 return to the initial position, and the fixed assembly is convenient to take out of the drill hole. The bottom of the wedge block 251 is slidably connected with the inner wall of the fixed cylinder 20, and the bottom of the fixed cylinder 20 is located around the fixed rod 26 and is provided with a fixed column 22, so as to facilitate workers to take.

[0030] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit it.

Claims

1. A device for monitoring stress in a surrounding rock of a roadway, characterized in that The utility model relates to a kind of fixed assembly and monitoring device for monitoring the deformation of hole wall, comprising: Fixed assembly, the fixed assembly includes fixed cylinder (20) and multiple groups of movable connector that are inserted on the circumferential surface of the fixed cylinder (20), the connector is provided with placement slot (211), the inside of the fixed cylinder (20) is slidably provided with the pusher corresponding to the position and number of connector, one end of the pusher penetrates connector and extends into the placement slot (211) of connector, drives multiple pushers to reciprocate along the radial direction of fixed cylinder (20) to make multiple pushers converge or open; Monitoring device, the monitoring device includes strain gauge (13) placed in the placement slot (211) and data acquisition module (12) electrically connected with the strain gauge (13), the outside of the strain gauge (13) is coated with adhesive, drive the pusher to open, push the strain gauge (13) out of placement slot (211), so that strain gauge is pasted to hole wall, the strain gauge (13) is fixed with hole wall under the action of adhesive, when the hole wall is deformed under the action of external pressure, deformation is collected by data acquisition module (12) by strain gauge acquisition.

2. The roadway surrounding rock stress monitoring device according to claim 1, characterized in that: The connector includes connecting rod (23) that is movably inserted on the side wall of the fixed cylinder (20), the end of the connecting rod (23) away from the fixed cylinder (20) is fixedly provided with fixed plate (21), the placement slot (211) is provided on the side of the fixed plate (21) away from the connecting rod (23), the inside of the connecting rod (23) is communicated with the placement slot (211), spring one (24) is arranged on the surface of the connecting rod (23) between the fixed cylinder (20) and the fixed plate (21).

3. The device for monitoring stress of roadway surrounding rock according to claim 2, characterized in that: The strain gauge (13) is electrically connected with wire harness fixing frame (10) by signal line, the wire harness fixing frame (10) is electrically connected with the data acquisition module (12) by wire harness (11), and the fixed plate (21) is provided with opening (212) for signal line movement.

4. The roadway surrounding rock stress monitoring device according to claim 2, characterized in that: The pusher includes movable rod (25) movably inserted in the connecting rod (23), the bottom of the movable rod (25) is fixedly connected with wedge block (251), spring two (27) is arranged between the wedge block (251) and the inner wall of the fixed cylinder (20), and the side of the wedge block (251) away from spring two (27) is provided with inclined portion.

5. The device for monitoring stress of roadway surrounding rock according to claim 4, characterized in that: The area enclosed by multiple wedge blocks (251) is provided with conical body (261), and the bottom of the conical body (261) is fixedly provided with fixed rod (26), to drive the conical body (261) to move along the axial direction of the fixed cylinder (20) and extrude the inclined portion of the movable block wedge block (251), so as to drive the movable rod (25) to move along the radial direction of the fixed cylinder (20).

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