CN113984268A - Hole wall strain type three-dimensional real-time stress monitoring device - Google Patents
Hole wall strain type three-dimensional real-time stress monitoring device Download PDFInfo
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- CN113984268A CN113984268A CN202111313200.9A CN202111313200A CN113984268A CN 113984268 A CN113984268 A CN 113984268A CN 202111313200 A CN202111313200 A CN 202111313200A CN 113984268 A CN113984268 A CN 113984268A
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 23
- 239000003292 glue Substances 0.000 claims abstract description 74
- 238000002347 injection Methods 0.000 claims abstract description 58
- 239000007924 injection Substances 0.000 claims abstract description 58
- 239000000243 solution Substances 0.000 claims abstract description 4
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 abstract description 20
- 238000005553 drilling Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000009412 basement excavation Methods 0.000 abstract description 2
- 239000011435 rock Substances 0.000 description 19
- 239000011888 foil Substances 0.000 description 8
- 239000000523 sample Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
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Abstract
The invention relates to a hole wall strain type three-dimensional real-time stress monitoring device, and belongs to the technical field of real-time three-dimensional stress monitoring of excavation disturbance secondary redistribution stress drilling in measurement engineering. The device comprises a glue injection piston, a wire groove main body, a platform main body and a cable; the glue injection piston is provided with a glue injection hole, one end of the glue injection piston is a glue injection end, and the other end of the glue injection piston is a piston end; one end of the wire groove main body is provided with an axial blind hole, namely a piston cavity, three groups of wire grooves are uniformly distributed on the outer cylindrical surface of the other end, and three groups of strain gauges are uniformly distributed on the outer cylindrical surface of the middle part; the axial direction of the platform main body is provided with a shaft hole, the cable is positioned in the shaft hole, one end of the cable is radially provided with a cable slot, and the outer cylindrical surface of the other end of the cable slot is provided with a fixed terminal; a plurality of wires in the cable are respectively and fixedly connected with the fixed terminal and the three groups of strain gauges; when the glue injection device is used, AB glue solution is injected into the piston cavity of the line tank main body, and the piston end of the glue injection piston is located in the piston cavity in a matched mode. The invention has simple structure and convenient operation, and realizes the real-time and three-dimensional stress monitoring of the engineering ground pressure.
Description
Technical Field
The invention belongs to the technical field of real-time three-dimensional stress monitoring of excavation disturbance secondary redistribution stress drilling in measurement engineering, and particularly relates to a three-dimensional stress real-time monitoring device for rock masses such as mines, tunnels and underground chambers.
Background
In the actual mine production, the frequently existing ground pressure activities easily cause casualty accidents, so that the production in a mining area is partially stopped, even a huge disaster can be caused, and huge economic loss is caused. In order to effectively prevent mine disaster accidents and guarantee stable promotion of safety production in mining areas, monitoring of mine production ground pressure change rules is carried out based on ground pressure management practice so as to optimize and design mine safety production, and the method has very positive and important significance. Therefore, the intelligent sensor for geotechnical engineering is designed and researched and gradually popularized and applied to activities such as mine ground pressure disaster monitoring, assessment and early warning, and the indispensable role and position of the intelligent sensor can be increasingly highlighted.
At present, related products in the market have mine ground pressure monitoring stressometers available for purchase, but mainly focus on one-dimensional stressometers and partial false three-dimensional stressometers. The one-dimensional stress meter can only be used for monitoring the stress of a similar columnar engineering structure and is not suitable for three-dimensional situations; although the pseudo three-dimensional stress meter can realize three-dimensional stress monitoring, the acting directions of three main stresses need to be pre-judged, and all-dimensional and multi-angle space mechanical parameters cannot be obtained, so that the distribution rule of the stress at any position of a space is difficult to completely predict, the surrounding environment is changeable instantly, earth pressure disaster data in a certain time range needs to be captured, and the requirements of actual monitoring and data real-time acquisition of secondary redistribution of engineering rock stress in a complex environment are difficult to meet only by using the pseudo three-dimensional stress meter in a short-term or instant state.
In order to solve the problem of three-dimensional stress real-time monitoring of mine ground pressure disasters, the invention designs a hole wall strain type three-dimensional real-time stress meter device. The three-dimensional stress parameters of the contact part of any stress probe in a plurality of spaces can be obtained by combining manual field concentrated acquisition and real-time communication of an integrated circuit: the magnitude, direction and inclination angle of the three main stresses, the difference of the main stresses in all directions and the like can reach higher use precision and application range, and a precious and reliable data source is provided for completely and accurately evaluating the change rule of the earth pressure; and even there is power module in the structure, still can independently set up acquisition frequency, for outdoor long-term real-time supervision with store data realize probably.
Disclosure of Invention
The invention provides a strain type three-dimensional real-time stress monitoring device for a hole wall, aiming at solving the problem of three-dimensional stress real-time monitoring of mine ground pressure disasters.
A hole wall strain type three-dimensional real-time stress monitoring device comprises a glue injection piston 1, a wire groove main body 2, a platform main body 3 and a cable 38 which are coaxially and sequentially connected;
the glue injection piston 1 is a cylinder, and a through glue injection hole 11 is formed in the middle of the axial direction of the piston; one end of the glue injection piston 1 is a glue injection end, the other end of the glue injection piston is a piston end, and a pair of fixing holes 13 penetrating through the glue injection holes 11 are formed in the radial direction of the piston end;
the wire casing main body 2 is a cylinder, one end of the wire casing main body 2 is provided with an axial blind hole, the axial blind hole is a piston cavity 21, a pair of pin holes 26 penetrating through the radial direction are radially formed in the end port of the piston cavity 21, and the pin holes 26 correspond to the fixing holes 13 on the glue injection piston 1; three groups of wire slots 24 are uniformly distributed on the outer cylindrical surface at the other end of the wire slot main body 2, and three groups of strain gauges 25 are uniformly distributed on the outer cylindrical surface in the middle of the wire slot main body 2;
the platform main body 3 is a cylinder, and a shaft hole is formed in the axis; one end of the platform main body 3 is a cylinder 33, a cable slot 35 penetrating through the shaft hole is radially formed in the cylinder 33, and a fixing plug 36 is arranged in the cable slot 35 in a matching manner; the other end is a triangular prism 32, and a fixed terminal 37 is arranged on the outer cylindrical surface of the triangular prism 32;
the end part of the triangular prism 32 is fixedly connected with the end surface of the cylindrical end of the wire casing main body 2;
the cable 38 is positioned in the shaft hole of the platform main body 3 and is fixed by the fixing plug 36; one wire in the cable wires 38 is fixedly connected with the fixed terminal 37, and the other wires in the cable wires 38 are respectively connected with the three groups of strain gauges 25 through the three groups of wire slots 24 on the wire slot main body 2;
during the use, pour into AB glue solution 44 in the piston chamber 21 of wire casing main part 2, the piston end cooperation of injecting glue piston 1 is located the piston chamber 21 of wire casing main part 2.
The technical scheme for further limiting is as follows:
the end face of the glue injection end of the glue injection piston 1 is provided with a cross-shaped glue overflow groove 12, and the glue injection hole 11 is located in the center of the cross-shaped glue overflow groove 12.
Each group of the wire slots 24 is provided with more than three wire slots.
Each set of strain gages 25 is provided with more than three strain gages.
The outer cylindrical surface in the middle of the wire casing main body 2 is an inward concave ring 22, and the three groups of strain gauges 25 are uniformly distributed on the concave ring 22.
An arc-shaped blind hole 34 is formed on the platform main body 3 corresponding to the fixed plug 36 in the radial direction.
The beneficial technical effects of the invention are embodied in the following aspects:
1. the structural particularity of the hole wall strain type three-dimensional real-time stress monitoring device can ensure that the experimental device is complete and lossless when workers monitor stress of engineering rock masses at mines, tunnels, underground chambers and the like in the field, so that the truth, accuracy and effectiveness of the acquired ground pressure data can be ensured, and information support is provided for data processing, statistical analysis and output report in ground pressure monitoring software. The annular groove is formed in the position of the strain foil of the stress probe main body, so that the high-sensitivity miniature induction strain foil is arranged in the annular groove below the surface of the probe, and the strain foil can be prevented from being directly contacted with a rock wall of a drill hole to generate friction sliding to damage the probe in the processes of carrying, mounting and field measurement use at ordinary times; the invention also arranges three groups of strain foil wire grooves on the surface of the stress probe body, which can respectively place the fragile and breakable strain foil metal leads in the sunken grooves, and the fragile and breakable strain foil metal leads can be flatly delivered and tightly combined with the use of the strain foils in the monitoring and mounting processes, and can be sunken downwards at the same time to ensure that the leads of the strain foils cannot be touched when the probe is carelessly rubbed and dislocated with the rock wall of the drill hole, thereby causing the problem that the leads can not be normally used after being broken. The arrangement of the ring groove and the wire groove on the surface of the stress probe body effectively ensures that sensitive and fragile strain gauges and leads are intact in the using process, so that required ground pressure disaster data can be accurately acquired, and a precondition guarantee is provided for the generation and analysis of the following results.
2. The richness of three-dimensional space parameter types and the real-time property of ground pressure monitoring acquired by the hole wall strain type three-dimensional real-time stress monitoring device can provide sufficient data sources for effective evaluation and disaster early warning of ground pressure disasters, and greatly broadens the range of ground pressure disastersApplication and practice of the product. In the process of monitoring the stress of an actual engineering rock mass, the magnitude, direction and direction of the stress are uncertain in advance and can change at any time along with the change of a complex environment, if the stress mechanical parameters of any required position cannot be accurately and long-term measured, the subsequent analysis and study and judgment can be influenced, and the stress meter device can realize the three-dimensional real-time monitoring of the stress, thereby effectively solving the existing problems. The rated compression resistance of the invention can reach 150MPa and can realize 10-6The using requirement in the precision range of the pressure sensor can accurately acquire 12 detailed mechanical parameter values such as the size, the direction, the inclination angle, the difference of each main stress and the like of three main stresses in the three-dimensional space of any contact position after the stress probe extends into the rock wall of the drill hole by utilizing the acquisition circuit module, and the composition and the distribution condition of the force at the position at the moment can be comprehensively defined and described by acquiring three-dimensional data; the invention also utilizes the function that the power supply module can be connected with the portable mobile power supply, namely, the power supply limitation of working equipment during monitoring is eliminated, so that the real-time monitoring of the engineering earth pressure in the non-electricity supply area becomes possible, the acquisition frequency (generally more than 5 min) can be set independently, the earth pressure disaster data can be automatically stored, and when the rock stress changes due to the complex change of the surrounding environment, the acquisition requirement of secondary redistribution of the stress can be flexibly and changeably adapted, and the purposes of long-term acquisition and stress data change observation can be achieved.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is an exploded view of the piston cavity of the trunking body and the piston end of the glue injection piston in cooperation.
Fig. 3 is a schematic structural diagram of the glue injection piston.
Fig. 4 is a rear perspective view of fig. 3.
Fig. 5 is a schematic structural diagram of a wire duct body.
Fig. 6 is a rear perspective view of fig. 5.
FIG. 7 is a schematic structural diagram of a platform.
Fig. 8 is an exploded view of fig. 7.
Fig. 9 is a rear exploded view of fig. 8.
Fig. 10 is a state diagram of the real-time stress monitoring device located outside the detected surrounding rock.
Fig. 11 is a diagram illustrating a state that the real-time stress monitoring device enters the detected surrounding rock.
FIG. 12 is a diagram showing the state after glue spraying detection.
Sequence numbers in the upper figure: the glue injection piston 1, the wire casing main body 2, the platform main body 3, the glue injection hole 11, the glue overflow groove 12, the fixing hole 13, the piston cavity 21, the concave ring 22, the wire casing pipe cavity 23, the wire casing 24, the strain gauge 25, the pin hole 26, the wire measuring transition arc face 31, the triangular prism 32, the cylinder 33, the arc blind hole 34, the cable wire casing 35, the fixing plug 36, the fixing terminal 37, the cable 38, the mounting rod 39, the power supply module 40, the acquisition circuit module 41, the handheld acquisition terminal 42, the drilling hole 43, the AB glue solution 44 and the surrounding rock 45.
Detailed Description
The invention will now be further described by way of example with reference to the accompanying drawings.
Referring to fig. 1, a hole wall strain type three-dimensional real-time stress monitoring device comprises a glue injection piston 1, a wire casing main body 2, a platform main body 3 and a cable 38 which are coaxially connected in sequence.
Referring to fig. 2 and 4, the glue injection piston 1 is a cylinder, and a through glue injection hole 11 is formed in the middle of the cylinder in the axial direction; one end of the glue injection piston 1 is a glue injection end, the other end of the glue injection piston is a piston end, and a pair of fixing holes 13 penetrating through the glue injection holes 11 are formed in the radial direction of the piston end. Referring to fig. 3, a cross-shaped glue overflow slot 12 is formed in the end face of the glue injection end of the glue injection piston 1, and the glue injection hole 11 is located in the center of the cross-shaped glue overflow slot 12.
Referring to fig. 2 and 4, the trunking body 2 is a cylinder, and one end of the trunking body 2 is provided with an axial blind hole, which is a piston cavity 21; referring to fig. 5 and 6, a pair of pin holes 26 penetrating in the radial direction are radially formed at the end of the piston cavity 21, and the pair of pin holes 26 correspond to the pair of fixing holes 13 on the glue injection piston 1. Three groups of wire grooves 24 are uniformly distributed on the outer cylindrical surface at the other end of the wire groove main body 2, and three groups of strain gauges 25 are uniformly distributed on the outer cylindrical surface in the middle of the wire groove main body 2. Each group of wire grooves 24 is provided with five wire grooves, and each group of strain gauges 25 is provided with four strain gauges.
Referring to fig. 7, 8 and 9, the platform body 3 is a cylinder, and a shaft hole is formed on the axis; one end of the platform main body 3 is a cylinder 33, a cable slot 35 penetrating through the shaft hole is radially formed in the cylinder 33, and a fixing plug 36 is arranged in the cable slot 35 in a matching manner; the other end is a triangular prism 32, and a fixed terminal 37 is arranged on the outer cylindrical surface of the triangular prism 32; the end of the triangular prism 32 is fixedly connected with the end surface of the cylindrical end of the wire casing main body 2.
The cable 38 is positioned in the shaft hole of the platform main body 3 and is fixed by the fixing plug 36; one of the cables 38 is fixedly connected to the fixed terminal 37, and the other cables 38 are connected to the four sets of strain gauges 25 through the five sets of slots 24 on the slot main body 2.
The specific monitoring operation process is described as follows:
in the actual monitoring process, a drill hole 43 with the diameter of 40mm and the depth of 1-1.2 m is drilled downwards at an inclination angle of 1-2 degrees of a position of a measuring point to be tested, and meanwhile, gravel slag in the hole is blown off by a high-pressure air pipe, so that early preparation can be made for the subsequent insertion of a real-time stress monitoring device.
Referring to fig. 10, a mounting rod 39, which is prepared in advance, is inserted into the blind arcuate hole 34 in the bottom of the monitoring device, and the fixing plug 36 is fitted into the cable duct 35 with the fixing plug 36 facing downward.
Referring to fig. 11, when the real-time stress monitoring device is inserted into the borehole 43 and the glue injection end of the glue injection piston 1 is not yet in contact with the rock wall of the surrounding rock 45, the real-time stress monitoring device slowly moves forward at a uniform speed without rotating the installation rod 39 until the glue injection end of the glue injection piston 1 is sent to the bottom of the test borehole 43, so that the end marking of the installation rod 39 is ensured to be positioned right above.
Referring to fig. 12, when the glue injection end of the glue injection piston 1 is in contact with the rock wall of the surrounding rock 45 and cannot move forward continuously, the mounting rod 39 is pushed hard to break the fuse until the mounting rod 39 cannot be pushed to the rear for 10 seconds, and then the mounting rod 39 is pulled out slowly, so that the AB glue 44 in the piston cavity 21 is extruded by the glue injection piston 1 and overflows from the glue injection hole 11 to wrap the glue injection end of the whole glue injection piston 1, complete and close contact with the rock wall of the surrounding rock 45 is achieved, finally, the real-time monitoring device is left at the bottom of the tested drill hole 43, and the three-dimensional stress real-time monitoring data is acquired through the handheld acquisition terminal 42 connected with the cable 38.
Claims (6)
1. The utility model provides a three-dimensional real-time stress monitoring devices of hole wall strain formula which characterized in that: the device comprises a glue injection piston (1), a wire groove main body (2), a platform main body (3) and a cable (38) which are coaxially connected in sequence;
the glue injection piston (1) is a cylinder, and a through glue injection hole (11) is formed in the middle of the axial direction of the cylinder; one end of the glue injection piston (1) is a glue injection end, the other end of the glue injection piston is a piston end, and a pair of fixing holes (13) penetrating through the glue injection holes (11) are formed in the radial direction of the piston end;
the wire casing main body (2) is a cylinder, one end of the wire casing main body (2) is provided with an axial blind hole, the axial blind hole is a piston cavity (21), a pair of pin holes (26) penetrating through the radial direction are radially formed in the port of the piston cavity (21), and the pin holes (26) correspond to the fixing holes (13) in the glue injection piston (1); three groups of wire slots (24) are uniformly distributed on the outer cylindrical surface at the other end of the wire slot main body (2), and three groups of strain gauges (25) are uniformly distributed on the outer cylindrical surface in the middle of the wire slot main body (2);
the platform main body (3) is a cylinder, and a shaft hole is formed in the axis; one end of the platform main body (3) is a cylinder (33), a cable slot (35) penetrating through the shaft hole is formed in the cylinder (33) in the radial direction, and a fixing plug (36) is arranged in the cable slot (35) in a matching mode; the other end is a triangular prism (32), and the outer cylindrical surface of the triangular prism (32) is provided with a fixed terminal (37);
the end part of the triangular prism (32) is fixedly connected with the end surface of the cylindrical end of the wire casing main body (2);
the cable (38) is positioned in the shaft hole of the platform main body (3) and is fixed by a fixing plug (36); one wire in the cable (38) is fixedly connected with a fixed terminal (37), and the other wires in the cable (38) are respectively connected with three groups of strain gauges (25) through three groups of wire slots (24) on the wire slot main body (2);
when the glue injection device is used, AB glue solution (44) is injected into the piston cavity (21) of the wire slot main body (2), and the piston end of the glue injection piston (1) is matched with and positioned in the piston cavity (21) of the wire slot main body (2).
2. The hole wall strain type three-dimensional real-time stress monitoring device according to claim 1, wherein: the glue injection piston (1) is provided with a cross glue overflow groove (12) on the end face of the glue injection end, and the glue injection hole (11) is located in the center of the cross glue overflow groove (12).
3. The hole wall strain type three-dimensional real-time stress monitoring device according to claim 1, wherein: more than three wire grooves are arranged in each group of wire grooves (24).
4. The hole wall strain type three-dimensional real-time stress monitoring device according to claim 1, wherein: each group of strain gauges (25) is provided with more than three strain gauges.
5. The hole wall strain type three-dimensional real-time stress monitoring device according to claim 1, wherein: the outer cylindrical surface in the middle of the wire casing main body (2) is a concave ring (22) which is inwards concave, and the three groups of strain gauges (25) are uniformly distributed on the concave ring (22).
6. The hole wall strain type three-dimensional real-time stress monitoring device according to claim 1, wherein: an arc blind hole (34) is arranged on the platform main body (3) which radially corresponds to the fixed plug (36).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111313200.9A CN113984268A (en) | 2021-11-08 | 2021-11-08 | Hole wall strain type three-dimensional real-time stress monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111313200.9A CN113984268A (en) | 2021-11-08 | 2021-11-08 | Hole wall strain type three-dimensional real-time stress monitoring device |
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| CN113984268A true CN113984268A (en) | 2022-01-28 |
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| CN202111313200.9A Pending CN113984268A (en) | 2021-11-08 | 2021-11-08 | Hole wall strain type three-dimensional real-time stress monitoring device |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1143230A2 (en) * | 2000-04-07 | 2001-10-10 | HERA Rotterdam B.V. | Strain and force measuring device |
| CN102606149A (en) * | 2012-03-20 | 2012-07-25 | 长江水利委员会长江科学院 | Storage type geostress testing method and storage type geostress testing device by means of hole-wall strain method |
| CN103353365A (en) * | 2013-06-27 | 2013-10-16 | 南京航空航天大学 | Point-contact pin-type force sensor |
| CN203519230U (en) * | 2013-10-08 | 2014-04-02 | 中国矿业大学 | Coal-rock mass stress directional monitoring device |
| CN104390734A (en) * | 2014-12-02 | 2015-03-04 | 安徽恒源煤电股份有限公司 | Hollow inclusion stressometer |
| CN110595657A (en) * | 2019-09-23 | 2019-12-20 | 煤炭科学技术研究院有限公司 | Small-aperture 16-component conical strain gauge |
| CN216081859U (en) * | 2021-11-08 | 2022-03-18 | 安徽隧派智能科技有限公司 | Hole wall strain type three-dimensional real-time stress monitoring device |
-
2021
- 2021-11-08 CN CN202111313200.9A patent/CN113984268A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1143230A2 (en) * | 2000-04-07 | 2001-10-10 | HERA Rotterdam B.V. | Strain and force measuring device |
| CN102606149A (en) * | 2012-03-20 | 2012-07-25 | 长江水利委员会长江科学院 | Storage type geostress testing method and storage type geostress testing device by means of hole-wall strain method |
| CN103353365A (en) * | 2013-06-27 | 2013-10-16 | 南京航空航天大学 | Point-contact pin-type force sensor |
| CN203519230U (en) * | 2013-10-08 | 2014-04-02 | 中国矿业大学 | Coal-rock mass stress directional monitoring device |
| CN104390734A (en) * | 2014-12-02 | 2015-03-04 | 安徽恒源煤电股份有限公司 | Hollow inclusion stressometer |
| CN110595657A (en) * | 2019-09-23 | 2019-12-20 | 煤炭科学技术研究院有限公司 | Small-aperture 16-component conical strain gauge |
| CN216081859U (en) * | 2021-11-08 | 2022-03-18 | 安徽隧派智能科技有限公司 | Hole wall strain type three-dimensional real-time stress monitoring device |
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