CN110631744B - Anchor rod dynamometer for monitoring axial force of anchor rod - Google Patents
Anchor rod dynamometer for monitoring axial force of anchor rod Download PDFInfo
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- CN110631744B CN110631744B CN201911064038.4A CN201911064038A CN110631744B CN 110631744 B CN110631744 B CN 110631744B CN 201911064038 A CN201911064038 A CN 201911064038A CN 110631744 B CN110631744 B CN 110631744B
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- anchor rod
- dynamometer
- limiting plate
- resistance strain
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 18
- 238000007789 sealing Methods 0.000 claims description 15
- 238000009434 installation Methods 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 12
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002787 reinforcement 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
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses an anchor rod dynamometer for monitoring axial force of an anchor rod, belongs to the technical field of dynamometers, and solves the problem that the existing device is low in monitoring accuracy; the technical characteristics are as follows: the device comprises a base and a cover plate, wherein the cover plate is arranged on the upper portion of the base, the base and the cover plate are fixedly connected through a bolt, and a cushion pad used for protecting the base is arranged at the central position of the lower surface of the base.
Description
Technical Field
The invention relates to the technical field of dynamometers, in particular to an anchor rod dynamometer for monitoring axial force of an anchor rod.
Background
The anchor bolt support is widely applied to the engineering fields of mines, bridges, side slopes, foundation pits, tunnels, dam reinforcement, geological disaster treatment and the like, and the anchor bolt dynamometer is an instrument for measuring the stress change of an anchor bolt and can be used for various common anchor bolts in engineering. The working condition of the anchor rod is monitored so as to monitor the supporting quality of the anchor rod, thereby monitoring the stress (stress display) of the tunnel, the chamber and the surrounding rock, and being an indispensable monitoring instrument for researching the stability of the tunnel chamber.
Chinese patent CN202693167U discloses an anchor rod dynamometer for underground engineering model test, its main part is the alloy pipe, is provided with the anchor rod hole of two relative centre of a circle symmetries on the alloy pipe, is fixed with resistance strain transducer on the pipe between two anchor rod holes, has the wire rather than being connected on resistance strain transducer, but the device has the not high problem of monitoring precision, consequently, we propose an anchor rod dynamometer for monitoring anchor rod axial force.
Disclosure of Invention
The invention aims to provide an anchor rod dynamometer for monitoring axial force of an anchor rod, which comprises a base and a cover plate, wherein the cover plate is arranged at the upper part of the base, the base and the cover plate are fixedly connected through a bolt, and a cushion pad for protecting the base is arranged at the central position of the lower surface of the base.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an anchor rod dynamometer for monitoring anchor rod axial force, including base and apron, the upper portion of base is equipped with the apron, through bolt fixed connection between base and the apron, base lower surface central point puts the department and is equipped with the blotter that is used for protecting the base, a serial communication port, base upper surface central point puts the department and is equipped with the dynamometry subassembly, the symmetry is equipped with two resistance strain gauges on the base, two resistance strain gauges pass through wire electric connection with the dynamometry subassembly respectively, be equipped with a plurality of first buffer spring that are used for protecting the resistance strain gauge before resistance strain gauge and the base inner wall.
As a further scheme of the invention: the force measuring assembly comprises an anchor rod, a dynamometer sealing cavity and an anchor rod protection mechanism, the lower end of the anchor rod penetrates through the dynamometer sealing cavity and is fixedly connected with the anchor rod protection mechanism, the anchor rod protection mechanism is fixedly installed on the base, and the dynamometer sealing cavity is fixedly installed on the cover plate.
As a still further scheme of the invention: the stock protection mechanism includes horizontal limit guide, articulated seat and push rod, the bottom fixed connection of articulated seat and stock, the both sides of articulated seat articulate respectively has the push rod, the one end that articulated seat was kept away from to the push rod articulates there is the slider, the slider cover is established on horizontal limit guide, horizontal limit guide parallel arrangement is directly over the base, and horizontal limit guide's both ends fixedly connected with thread block, thread block cover is located on the lead screw, through threaded connection between thread block and the lead screw, the bottom of lead screw is fixed in on the base, sliding connection between slider and the horizontal limit guide.
As a still further scheme of the invention: and a second buffer spring used for protecting the sliding block and the push rod is arranged between the sliding block and the thread block, and the second buffer spring is arranged in the horizontal limiting guide rail.
As a still further scheme of the invention: the dynamometer seals the chamber and includes arc limiting plate and lower arc limiting plate, it sets up under the arc limiting plate to go up the arc limiting plate directly over, and the both sides of going up the arc limiting plate are equipped with the support arm, the lower bolster is installed to the both sides of arc limiting plate down, be equipped with the draw-in groove between the last support arm and the lower bolster of adjacent one side, the draw-in groove passes through bolt and apron fixed connection, the upside and the last support arm joint of draw-in groove, the downside and the lower bolster joint of draw-in groove, the draw-in groove, all be equipped with the thread groove in last support arm and the lower bolster, be equipped with adjusting screw in the thread groove, adjusting screw's both ends threaded.
As a still further scheme of the invention: go up the central point department of putting of arc limiting plate and lower arc limiting plate and all be equipped with vertical logical groove, vertical logical inslot fixed mounting has horizontal installation seat, and horizontal installation seat is improved level the equipartition and is had a plurality of stock spacing sleeves, and resistance strain transducer is installed to stock spacing sleeve's inner wall, passes through wire electric connection between resistance strain transducer and the resistance strain gauge.
In conclusion, the beneficial effects of the invention are as follows: according to the embodiment of the invention, the measurement precision of the force measurement assembly is improved, the plurality of anchor rod limiting sleeves are arranged, errors caused by the work of a single anchor rod limiting sleeve are avoided, the limiting nut and the adjusting screw cooperate to realize the fixation of the positions of the upper supporting arm and the lower supporting arm, the sealing of the upper arc limiting plate and the lower arc limiting plate is further realized, the precision of the force measurement assembly is ensured, and the interference of the force measurement assembly from the external environment is avoided.
Drawings
Fig. 1 is a schematic structural diagram of the invention.
Fig. 2 is a schematic structural diagram of the base in the invention.
Fig. 3 is a schematic structural view of an upper arc-shaped limiting plate in the invention.
Fig. 4 is a schematic structural view of a horizontal limit guide rail in the invention.
Fig. 5 is a schematic structural view of the horizontal mounting seat of the invention.
Fig. 6 is a schematic structural view of the anchor rod limiting sleeve in the invention.
In the figure: the device comprises a base 1, a resistance strain gauge 2, a first buffer spring 3, a buffer pad 4, a cover plate 5, a clamping groove 6, an upper support arm 7, a lower support arm 8, a limit nut 9, an adjusting screw rod 10, an upper arc limit plate 11, a lower arc limit plate 12, a vertical through groove 13, an anchor rod 14, a horizontal limit guide rail 15, a hinge seat 16, a push rod 17, a second buffer spring 18, a lead screw 19, a horizontal mounting seat 20, a resistance strain sensor 21 and an anchor rod limit sleeve 22.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1-2, in the embodiment of the present invention, an anchor rod dynamometer for monitoring an axial force of an anchor rod includes a base 1 and a cover plate 5, the upper portion of the base 1 is provided with the cover plate 5, the base 1 and the cover plate 5 are fixedly connected by a bolt, a cushion pad 4 for protecting the base 1 is disposed at a central position of a lower surface of the base 1, a force measurement assembly is disposed at a central position of an upper surface of the base 1, two resistance strain gauges 2 are symmetrically disposed on the base 1, and the two resistance strain gauges 2 are respectively electrically connected to the force measurement assembly through a wire;
the force measuring assembly comprises an anchor rod 14, a dynamometer sealing cavity and an anchor rod protection mechanism, the lower end of the anchor rod 14 penetrates through the dynamometer sealing cavity and is fixedly connected with the anchor rod protection mechanism, the anchor rod protection mechanism is fixedly arranged on the base 1, and the dynamometer sealing cavity is fixedly arranged on the cover plate 5;
as shown in fig. 4, the anchor rod protection mechanism includes a horizontal limit guide rail 15, a hinge seat 16 and a push rod 17, the hinge seat 16 is fixedly connected with the bottom of the anchor rod 14, the push rod 17 is hinged to two sides of the hinge seat 16 respectively, one end of the push rod 17 away from the hinge seat 16 is hinged with a slider, the slider is sleeved on the horizontal limit guide rail 15, the horizontal limit guide rail 15 is arranged in parallel right above the base 1, two ends of the horizontal limit guide rail 15 are fixedly connected with thread blocks, the thread blocks are sleeved on a lead screw 19, the thread blocks are connected with the lead screw 19 through threads, the bottom of the lead screw 19 is fixed on the base 1, a second buffer spring 18 for protecting the slider and the push rod 17 is further arranged between the slider and the thread blocks, and the second buffer spring 18 is installed;
when the anchor rod 14 is under tension or pressure, the anchor rod 14 acts on the push rod 17 and the slide block, so that the slide block stretches or extrudes the thread block, and the thread block and the screw rod 19 are in thread fit, so that the anchor rod 14 can be protected in a buffering manner, and the anchor rod 14 is prevented from being damaged;
the sliding block is connected with the horizontal limiting guide rail 15 in a sliding way.
Example 2
As shown in fig. 1-2, in the embodiment of the present invention, an anchor rod dynamometer for monitoring an axial force of an anchor rod includes a base 1 and a cover plate 5, the upper portion of the base 1 is provided with the cover plate 5, the base 1 and the cover plate 5 are fixedly connected by a bolt, a cushion pad 4 for protecting the base 1 is disposed at a central position of a lower surface of the base 1, a force measurement assembly is disposed at a central position of an upper surface of the base 1, two resistance strain gauges 2 are symmetrically disposed on the base 1, and the two resistance strain gauges 2 are respectively electrically connected to the force measurement assembly through a wire;
the force measuring assembly comprises an anchor rod 14, a dynamometer sealing cavity and an anchor rod protection mechanism, the lower end of the anchor rod 14 penetrates through the dynamometer sealing cavity and is fixedly connected with the anchor rod protection mechanism, the anchor rod protection mechanism is fixedly arranged on the base 1, and the dynamometer sealing cavity is fixedly arranged on the cover plate 5;
as shown in fig. 4, the anchor rod protection mechanism includes a horizontal limit guide rail 15, a hinge seat 16 and a push rod 17, the hinge seat 16 is fixedly connected with the bottom of the anchor rod 14, the push rod 17 is hinged to two sides of the hinge seat 16 respectively, one end of the push rod 17 away from the hinge seat 16 is hinged with a slider, the slider is sleeved on the horizontal limit guide rail 15, the horizontal limit guide rail 15 is arranged in parallel right above the base 1, two ends of the horizontal limit guide rail 15 are fixedly connected with thread blocks, the thread blocks are sleeved on a lead screw 19, the thread blocks are connected with the lead screw 19 through threads, the bottom of the lead screw 19 is fixed on the base 1, a second buffer spring 18 for protecting the slider and the push rod 17 is further arranged between the slider and the thread blocks, and the second buffer spring 18 is installed;
when the anchor rod 14 is under tension or pressure, the anchor rod 14 acts on the push rod 17 and the slide block, so that the slide block stretches or extrudes the thread block, and the thread block and the screw rod 19 are in thread fit, so that the anchor rod 14 can be protected in a buffering manner, and the anchor rod 14 is prevented from being damaged;
the sliding block is connected with the horizontal limiting guide rail 15 in a sliding way;
as shown in fig. 3, the dynamometer sealing cavity includes an upper arc limiting plate 11 and a lower arc limiting plate 12, the upper arc limiting plate 11 is arranged right above the lower arc limiting plate 12, upper support arms 7 are arranged on two sides of the upper arc limiting plate 11, lower support arms 8 are arranged on two sides of the lower arc limiting plate 12, a clamping groove 6 is arranged between the upper support arm 7 and the lower support arm 8 on the adjacent side, the clamping groove 6 is fixedly connected with the cover plate 5 through bolts, the upper side of the clamping groove 6 is clamped with the upper support arm 7, the lower side of the clamping groove 6 is clamped with the lower support arm 8, thread grooves are arranged in the clamping groove 6, the upper support arm 7 and the lower support arm 8, an adjusting screw 10 is arranged in each thread groove, and limit nuts 9 for fixing the adjusting screw 10 are connected with threads at;
the limiting nut 9 and the adjusting screw 10 work in a matched mode to fix the positions of the upper supporting arm 7 and the lower supporting arm 8, so that the upper arc-shaped limiting plate 11 and the lower arc-shaped limiting plate 12 are sealed, the precision of the force measuring assembly is guaranteed, and the force measuring assembly is prevented from being interfered by an external environment;
as shown in fig. 5-6, a vertical through groove 13 is formed in the center of each of the upper arc-shaped limiting plate 11 and the lower arc-shaped limiting plate 12, a horizontal mounting seat 20 is fixedly mounted in the vertical through groove 13, a plurality of anchor rod limiting sleeves 22 are horizontally and uniformly distributed on the horizontal mounting seat 20, the anchor rod 14 is limited by the anchor rod limiting sleeves 22, a resistance strain sensor 21 is mounted on the inner wall of each of the anchor rod limiting sleeves 22, the resistance strain sensor 21 is electrically connected with the resistance strain gauge 2 through a wire, the resistance strain sensor 21 can monitor the tension value of the anchor rod 14 in real time, and transmit the value to the resistance strain gauge 2, so that the anchor rod 14 can be monitored in real time;
a plurality of first buffer springs 3 for protecting the resistance strain gauge 2 are arranged in front of the resistance strain gauge 2 and the inner wall of the base 1.
In summary, the working principle of the invention is as follows: resistance strain sensor 21 can carry out real-time supervision to the pulling force value that stock 14 received, and transmit numerical value to resistance strain gauge 2, realize the real-time supervision to stock 14, when stock 14 received pulling force or pressure, stock 14 acts on push rod 17 and slider, make the slider tensile or extrusion thread piece, adopt screw-thread fit's mode between thread piece and the lead screw 19, can play the effect of buffer protection to stock 14, avoided the damage of stock 14.
Stop nut 9 and adjusting screw 10 cooperation have realized the fixed of going up support arm 7 and lower support arm 8 position, and then have realized the sealed of last arc limiting plate 11 and lower arc limiting plate 12, have guaranteed the precision of dynamometry subassembly, have avoided the dynamometry subassembly to receive external environment's interference.
According to the embodiment of the invention, the measurement precision of the force measurement assembly is improved, the plurality of anchor rod limiting sleeves 22 are arranged, errors caused by the work of a single anchor rod limiting sleeve 22 are avoided, the limiting nut 9 and the adjusting screw 10 work in a matching manner to fix the positions of the upper supporting arm 7 and the lower supporting arm 8, the upper arc limiting plate 11 and the lower arc limiting plate 12 are sealed, the precision of the force measurement assembly is ensured, and the force measurement assembly is prevented from being interfered by the external environment.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are only for the convenience of description of the invention and to simplify the description, and do not indicate or imply that the referred device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. An anchor rod dynamometer for monitoring axial force of an anchor rod comprises a base (1) and a cover plate (5), wherein the cover plate (5) is arranged at the upper part of the base (1), the base (1) and the cover plate (5) are fixedly connected through a bolt, a buffer cushion (4) for protecting the base (1) is arranged at the central position of the lower surface of the base (1), it is characterized in that a force measuring assembly is arranged at the center of the upper surface of a base (1), two resistance strain gauges (2) are symmetrically arranged on the base (1), the two resistance strain gauges (2) are respectively and electrically connected with the force measuring assembly through a lead, the force measuring assembly comprises an anchor rod (14), a dynamometer sealing cavity and an anchor rod protection mechanism, the lower end of the anchor rod (14) penetrates through the dynamometer sealing cavity, the anchor rod protection mechanism is fixedly arranged on the base (1), and the dynamometer sealing cavity is fixedly arranged on the cover plate (5); the dynamometer sealing cavity comprises an upper arc limiting plate (11) and a lower arc limiting plate (12), the upper arc limiting plate (11) is arranged right above the lower arc limiting plate (12), the two sides of the upper arc limiting plate (11) are provided with upper supporting arms (7), the two sides of the lower arc limiting plate (12) are provided with lower supporting arms (8), a clamping groove (6) is arranged between the upper supporting arm (7) and the lower supporting arm (8) on one adjacent side, the clamping groove (6) is fixedly connected with a cover plate (5) through a bolt, the upper side of the clamping groove (6) is clamped with the upper supporting arm (7), the lower side of the clamping groove (6) is clamped with the lower supporting arm (8), the clamping groove (6), thread grooves are formed in the upper supporting arm (7) and the lower supporting arm (8), an adjusting screw rod (10) is arranged in each thread groove, and limiting nuts (9) for fixing the adjusting screw rod (10) are in threaded connection, go up the central point department of putting of arc limiting plate (11) and lower arc limiting plate (12) and all be equipped with vertical logical groove (13), vertical logical groove (13) internal fixation is equipped with horizontal installation seat (20), horizontal installation seat (20) are improved level the equipartition and are had a plurality of stock spacing sleeves (22), resistance strain transducer (21) are installed to the inner wall of stock spacing sleeve (22), pass through wire electric connection between resistance strain transducer (21) and resistance strain gauge (2).
2. The anchor dynamometer for monitoring the axial force of an anchor rod according to claim 1, wherein the anchor rod protection mechanism comprises a horizontal limit guide rail (15), a hinged seat (16) and a push rod (17), the hinged seat (16) is fixedly connected with the bottom of the anchor rod (14), the push rod (17) is hinged to each of two sides of the hinged seat (16), one end, far away from the hinged seat (16), of the push rod (17) is hinged to a sliding block, the sliding block is sleeved on the horizontal limit guide rail (15), the horizontal limit guide rail (15) is arranged right above the base (1) in parallel, threaded blocks are fixedly connected to two ends of the horizontal limit guide rail (15), the threaded blocks are sleeved on the screw rod (19), the threaded blocks are connected with the screw rod (19) in a threaded manner, and the bottom of the screw rod (19) is fixed on the base (1).
3. A bolt dynamometer for monitoring axial force of a bolt according to claim 2, characterized by a sliding connection between the slide and the horizontal limit rail (15).
4. A bolt dynamometer for monitoring axial force of a bolt according to claim 3, characterized in that a second buffer spring (18) for protecting the slide and the push rod (17) is further provided between the slide and the threaded block, the second buffer spring (18) being installed in the horizontal limit rail (15).
5. A rock bolt dynamometer for monitoring axial force of a rock bolt according to any of claims 1-4, characterized by a plurality of first buffer springs (3) for protecting the resistance strain gauge (2) located in front of the resistance strain gauge (2) and the inner wall of the base (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911064038.4A CN110631744B (en) | 2019-11-04 | 2019-11-04 | Anchor rod dynamometer for monitoring axial force of anchor rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911064038.4A CN110631744B (en) | 2019-11-04 | 2019-11-04 | Anchor rod dynamometer for monitoring axial force of anchor rod |
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| Publication Number | Publication Date |
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| CN110631744A CN110631744A (en) | 2019-12-31 |
| CN110631744B true CN110631744B (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911064038.4A Active CN110631744B (en) | 2019-11-04 | 2019-11-04 | Anchor rod dynamometer for monitoring axial force of anchor rod |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118418193B (en) * | 2024-07-02 | 2024-09-20 | 德瑞精工（深圳）有限公司 | Overload pressure-preventing closed-loop ZR shaft module and preparation method thereof |
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| DE3636322A1 (en) * | 1986-10-24 | 1988-05-05 | Polensky & Zoellner Baugesells | Device for measuring length changes caused by tensile forces in anchors such as rock or ground anchors or cable anchorages |
| SI20084A (en) * | 1998-10-05 | 2000-04-30 | Inštitut Za Rudarstvo, Geotehnologijo In Okolje | Measuring anchor for measurement of axial force distribution with depth |
| CN201635754U (en) * | 2010-01-29 | 2010-11-17 | 西安科技大学 | Force measurement anchor device for analog simulation experiment |
| CN102706492A (en) * | 2012-06-29 | 2012-10-03 | 山东大学 | Anchor rod dynamometer and dynamometry method for underground engineering model experiment |
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| CN207395939U (en) * | 2017-11-15 | 2018-05-22 | 西安特种设备检验检测院 | A kind of elevator wire rope tension monitoring device |
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| DE3636322A1 (en) * | 1986-10-24 | 1988-05-05 | Polensky & Zoellner Baugesells | Device for measuring length changes caused by tensile forces in anchors such as rock or ground anchors or cable anchorages |
| SI20084A (en) * | 1998-10-05 | 2000-04-30 | Inštitut Za Rudarstvo, Geotehnologijo In Okolje | Measuring anchor for measurement of axial force distribution with depth |
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| CN202693167U (en) * | 2012-06-29 | 2013-01-23 | 山东大学 | Rock bolt extensometer for underground engineering model test |
| US9360397B1 (en) * | 2014-07-02 | 2016-06-07 | William H Melton | Anchor inspection device |
| CN204000645U (en) * | 2014-08-14 | 2014-12-10 | 西安公路研究院 | A kind of bridge beam body reinforcing construction prestressed stretch-draw and checkout gear |
| CN205593681U (en) * | 2016-04-28 | 2016-09-21 | 山西海源阳光科技有限公司 | Mining anchor rod force measurer |
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| Publication number | Publication date |
|---|---|
| CN110631744A (en) | 2019-12-31 |
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