CN212158549U - Strain gauge - Google Patents
Strain gauge Download PDFInfo
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- CN212158549U CN212158549U CN202021021795.1U CN202021021795U CN212158549U CN 212158549 U CN212158549 U CN 212158549U CN 202021021795 U CN202021021795 U CN 202021021795U CN 212158549 U CN212158549 U CN 212158549U
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- leg part
- leg portion
- leg
- glue solution
- strain gauge
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Abstract
The utility model relates to a strainometer, including being used for with the first leg portion and the second leg portion that link to each other by the measuring element, first leg portion, second leg portion are arranged about, first leg portion orientation one side of second leg portion is provided with and is used for supporting the complex top with the second leg portion and supports the locating surface, is provided with between first leg portion, the second leg portion to be used for forcing first leg portion, second leg portion relative movement's positioning spring or magnetic structure, still is provided with between first leg portion, the second leg portion to be used for measuring the displacement measuring mechanism that the displacement changes between first leg portion, the second leg portion. The utility model provides a need not to carry out the strainometer that the landing leg interval measured and confirmed.
Description
Technical Field
The utility model relates to a strainometer among the bridge strain detection area.
Background
Newly-built bridge and the bridge after having carried out reinforcement or reconstruction, whether normal operating condition and bearing capacity of bridge structures meet the design requirement can be examined through the load test.
It is common practice to pass a vehicle under a certain load through a bridge and then measure the strain, deflection and inclination deformation of the bridge according to corresponding sensors on the bridge. For example, for strain measurement, a surface type strain gauge is fixed on the bottom surface of a beam, wherein the strain gauge is matched with the beam as shown in fig. 1, the strain gauge comprises fixing legs 2 which are independently arranged, fixing holes for the corresponding fixing legs to pass through are respectively arranged on a body of the strain gauge 3, during specific operation, a worker is lifted to the lower side of the beam body 1 through a lifting machine, the worker measures the distance between the two fixing legs 2 on the bottom surface of the beam, then the fixing legs are fixedly bonded on the bottom surface of the beam, finally the strain gauge 3 is sleeved on the fixing legs, and the strain gauge is fixed on the supporting legs through screwing nuts 4 on screw rods 5 of the fixing legs. When the beam is deformed by a load, the distance between the two legs changes, and the strain gauge measures the amount of change.
The existing strain gauge has the problems that: the distance between the two fixed legs is actually at the deformation zero point of the positioning strain gauge, and workers are required to measure the distance between the legs and the like, so that the time of high-altitude operation is seriously prolonged, and the high-altitude operation is not facilitated.
SUMMERY OF THE UTILITY MODEL
The utility model aims to not need to carry out the definite strainometer of landing leg interval measurement.
In order to solve the technical problem, the utility model provides a technical scheme as follows:
a strain gauge comprises a first leg portion and a second leg portion, wherein the first leg portion and the second leg portion are connected with a measured part, the first leg portion and the second leg portion are arranged left and right, one side, facing the second leg portion, of the first leg portion is provided with an abutting positioning surface used for abutting and matching with the second leg portion, a positioning spring or a magnetic structure used for forcing the first leg portion and the second leg portion to move relatively is arranged between the first leg portion and the second leg portion, and a displacement measuring mechanism used for measuring displacement changes between the first leg portion and the second leg portion is further arranged between the first leg portion and the second leg portion.
The first leg portion is fitted to the second leg portion in a guided movable manner in the left-right direction.
The displacement measuring mechanism comprises a flexible measuring piece, one end of the flexible measuring piece is fixed on the first supporting leg part, a measuring piece winding drum for winding the other end of the flexible measuring piece is arranged on the second supporting leg part, the displacement measuring mechanism further comprises a winding drum encoder for detecting the rotation of the measuring piece winding drum, and a winding drum spring for tensioning the flexible measuring piece is connected to the measuring piece winding drum.
The upper end surfaces of the first leg part and the second leg part are bonding connection surfaces for bonding connection with a measured member.
The first leg part and the second leg part are provided with a storage capsule, the upper end of the storage capsule is higher than the bonding connection surface and is used for being extruded by a measured part, the storage capsule is connected with a glue solution channel, the glue solution channel comprises a glue solution outlet hole positioned on the bonding connection surface and a connection channel connected with the glue solution outlet hole and the storage capsule, and the glue solution channel is provided with a breakable membrane.
The glue solution outlet is a big belly hole with a small upper part and a big lower part.
The upper ends of the first leg part and the second leg part are provided with mounting grooves, and the capsule storage is positioned in the mounting grooves.
The upper ends of the first leg part and the second leg part are provided with mounting grooves, pushing eccentric wheels are rotatably mounted in the mounting grooves and driven by a motor, and the pushing eccentric wheels are provided with pushing surfaces which are used for being matched with the part to be measured in a pushing mode so that the bonding connection surfaces are separated from the part to be measured.
The utility model has the advantages that: the utility model discloses in, when the strainometer is not connected with the measured measurement piece, receive the positioning spring effect, the top of first shank portion is supported the locating surface and is supported the cooperation with second shank portion top to this realizes displacement measurement mechanism's measurement zero point, when producing when being out of shape by the measurement piece, first shank portion, second shank portion can overcome positioning spring's effort and produce relative displacement, and displacement measurement mechanism records this displacement. The utility model discloses well strainometer's first shank portion and second shank portion are contacting, consequently do not need prior art to measure the interval of guaranteeing between two landing legs the same, easy operation.
Drawings
FIG. 1 is a schematic view of a strain gauge and a beam in the background art of the present invention;
fig. 2 is a schematic structural diagram of an embodiment of a strain gauge according to the present invention;
FIG. 3 is an enlarged view taken at A in FIG. 2;
fig. 4 is a schematic diagram of the strain gauge and the unmanned aerial vehicle according to the present invention;
fig. 5 is a schematic diagram of the strain gauge and the beam of the present invention.
Detailed Description
An embodiment of a strain gauge is shown in FIGS. 2-5:
the leg comprises a first leg part 1 and a second leg part 2 which are arranged at the left and right, wherein the first leg part 1 is matched with the second leg part 2 in a guiding and moving way along the left and right direction, a specific second leg part is provided with a guide hole 14 extending along the left and right direction along the guiding direction, and the first leg part is provided with a guide rod 13 extending into the guide hole and matched with the guide hole in a guiding and sliding way. The right end face of the first leg part forms a top abutting positioning face 20 which is used for abutting the matched top with the second leg part, a positioning spring 15 is arranged in the guide hole, the positioning spring 15 is an extension spring, the right end of the positioning spring is fixedly connected with the hole bottom of the guide hole, the left end of the positioning spring is fixedly connected with the guide rod 13, the positioning spring 15 exerts a right-facing pulling force on the first leg part 1, and it is guaranteed that the top abutting positioning face 20 on the first leg part 1 abuts against the second leg part 2 in a free state. A displacement measuring mechanism for measuring the relative displacement change of the first leg part and the second leg part is arranged between the first leg part 1 and the second leg part 2, in the embodiment, the displacement measuring mechanism is a stay cord displacement sensor 3, the displacement measuring mechanism comprises a flexible measuring part 4, one end of the flexible measuring part 4 is fixed on the first leg part, a measuring part winding drum 5 for winding the other end of the flexible measuring part is arranged on the second leg part, the displacement measuring mechanism further comprises a drum encoder for detecting the rotation of the measuring part winding drum, and a drum spring for tensioning the flexible measuring part is connected on the measuring part winding drum.
In order to adapt to the connection with the bottom surface of the beam body of the bridge, the upper end surfaces of the first leg part and the second leg part are adhesive connection surfaces 11 used for being adhesively connected with the measured piece. The left shoulder on the first leg portion and the right shoulder of second leg portion are provided with mounting groove 7, first leg portion, all be provided with the storage capsule 8 that is used for storing the glue solution in the mounting groove of second leg portion, the upper end of storage capsule 8 is higher than adhesive bonding face 11 and is used for being extruded by the measured part, be connected with the glue solution passageway on the storage capsule, the glue solution passageway is including being located glue solution outlet 10 on the adhesive bonding face and connecting the glue solution outlet 10 and the passageway 12 that is connected capsule 8, glue solution outlet 10 is big tripe hole from top to bottom, be provided with breakable membrane 9 on the glue solution passageway, breakable membrane 9 sets up in the aperture department of glue solution outlet 10 in this embodiment. In this embodiment, there are a plurality of glue outlets 10 on the first leg portion and the second leg portion, and the glue outlets on the same leg portion are connected by a connecting channel 12.
And pushing eccentric wheels 6 are rotatably arranged in the mounting grooves 7 of the first leg part and the second leg part and are driven by a motor, and the pushing eccentric wheels are provided with pushing surfaces 21 which are used for being in pushing fit with the measured piece so as to separate the bonding connection surface from the measured piece. And at the angle shown in fig. 3, the pushing eccentric wheel 6 on the first leg part rotates clockwise, and the pushing eccentric wheel on the second leg part rotates anticlockwise, so that the strain gauge can be pushed and separated from the lower side of the beam body. The glue solution outlet 10 is of a big belly structure with a small upper part and a big lower part, the breakable membrane 9 is arranged at the opening of the glue solution outlet 10, so that the breakable membrane can be torn by pressure, after the glue solution is solidified, the solidified glue solution, namely the bonding structure, is filled on the glue solution outlet and the bonding connection surface, the solidified glue solution and the leg part have stopping force of the big upper part and the small lower part besides the bonding force, when the strain gauge is separated from the bottom of the beam body, the bonding structure is separated from the bottom of the beam along with the strain gauge, and the problem that the surface of the bottom of the beam needs to be cleaned again in high-altitude operation due to the fact that the.
The utility model provides a strain gauge is shown in fig. 2 when not being fixed in the roof beam body bottom, under positioning spring's effect, the top on first shank portion 1 right side is supported locating surface 20 top and is supported in the left end of second shank portion 2, is exactly displacement measurement mechanism's measurement zero point this moment, and positioning spring has also connected first shank portion and second shank portion into a whole.
In the actual bridge, the downside that has a lot of bridges all is water, can't set up elevating system, can't send the bottom of bridge to the staff, even can set up elevating system some places, high altitude construction also is a challenge to staff's psychology. The utility model discloses in order to thoroughly liberate the staff, all set the rubber coating of strainometer to automatic mode with demolising fixedly, just so can accomplish the installation of strainometer with the help of some climbing mechanism. For example, the strain gauge is fixed at the bottom of the beam 19 by the unmanned aerial vehicle 17, as shown in fig. 4, a support frame 16 is placed at the top of a housing 18 of the unmanned aerial vehicle, a positioning groove 22 is formed at the top of the support frame, the strain gauge is placed in the positioning groove 22, the unmanned aerial vehicle drives the whole strain gauge to fly upwards until the adhesive connecting surface is contacted with the bottom surface of the beam, in the process, the capsule is compressed, the pressure of the glue solution in the connecting channel is increased, the breakable membrane is squeezed open, the glue solution flows to the whole adhesive connecting surface through an orifice, so that the adhesive connecting surface is fixed with the bottom of the beam, the glue solution outlet is a big belly hole, on one hand, the breakable membrane can be smoothly squeezed open, in addition, after the glue solution is solidified, a stop structure is formed by the glue solution and the belly hole, the fixing strength of the strain gauge and the beam can be ensured, the glue solution, the glue solution can reach 85% of the curing strength, and then the unmanned aerial vehicle can be evacuated and can reach 100% of the curing strength after standing for one day. After a load is applied to the upper side of the bridge, the beam body deforms, the first leg portion and the second leg portion overcome the acting force of the positioning spring to generate relative displacement, and the stay rope displacement sensor measures the displacement value to obtain the strain of the beam body. After the detection is finished, the motor drives the pushing eccentric wheel to rotate, the pushing eccentric wheel pushes the beam body to separate the first leg part and the second leg part from the beam body, the strain gauge drops, the strain gauge can be received by the net bag to prevent the strain gauge from being broken, or the strain gauge is received by the unmanned aerial vehicle, the pushing eccentric wheel acts again to push the strain gauge off from the beam body.
In other embodiments of the present invention: the positioning spring can also be a pressure spring, and the pressure spring applies acting force towards the right direction to the first leg part, so that the propping positioning surface of the first leg part props against the second leg part in a natural state; the displacement measuring mechanism may not be a stay wire displacement sensor, for example, the displacement measuring mechanism is a laser displacement sensor disposed between the first leg portion and the second leg portion; the strain gauge can also be jacked to the bottom of the beam body through other jacking mechanisms, for example, the strain gauge is jacked to the bottom of the beam body through a lifting vehicle; of course, the positioning spring may also be replaced by a magnetic structure, for example, the magnetic mechanism includes a first magnetic body disposed on the first leg portion and a second magnetic body disposed on the second leg portion, and the first magnetic body and the second magnetic body attract each other, so that the abutting positioning surface of the first leg portion always abuts against the second leg portion before the first leg portion is not fixed.
Claims (7)
1. A strain gauge, characterized by: the measuring device comprises a first leg part and a second leg part which are connected with a measured object, wherein the first leg part and the second leg part are arranged left and right, one side of the first leg part, which faces the second leg part, is provided with an abutting positioning surface which is used for abutting and matching with the second leg part, a positioning spring or a magnetic structure which is used for forcing the first leg part and the second leg part to move relatively is arranged between the first leg part and the second leg part, and a displacement measuring mechanism which is used for measuring the displacement change between the first leg part and the second leg part is also arranged between the first leg part and the second leg part.
2. The strain gage of claim 1 wherein: the first leg portion is fitted to the second leg portion in a guided movable manner in the left-right direction.
3. The strain gage of claim 1 wherein: the displacement measuring mechanism comprises a flexible measuring piece, one end of the flexible measuring piece is fixed on the first supporting leg part, a measuring piece winding drum for winding the other end of the flexible measuring piece is arranged on the second supporting leg part, the displacement measuring mechanism further comprises a winding drum encoder for detecting the rotation of the measuring piece winding drum, and a winding drum spring for tensioning the flexible measuring piece is connected to the measuring piece winding drum.
4. The strain gauge according to any one of claims 1 to 3, wherein: the upper end surfaces of the first leg part and the second leg part are bonding connection surfaces for bonding connection with a measured member.
5. The strain gauge of claim 4, wherein: the first leg part and the second leg part are provided with a storage capsule, the upper end of the storage capsule is higher than the bonding connection surface and is used for being extruded by a measured part, the storage capsule is connected with a glue solution channel, the glue solution channel comprises a glue solution outlet hole positioned on the bonding connection surface and a connection channel connected with the glue solution outlet hole and the storage capsule, and the glue solution channel is provided with a breakable membrane.
6. The strain gage of claim 5 wherein: the glue solution outlet is a big belly hole with a small upper part and a big lower part.
7. The strain gage of claim 5 wherein: the upper ends of the first leg part and the second leg part are provided with mounting grooves, and the capsule storage is positioned in the mounting grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021021795.1U CN212158549U (en) | 2020-06-06 | 2020-06-06 | Strain gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021021795.1U CN212158549U (en) | 2020-06-06 | 2020-06-06 | Strain gauge |
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| Publication Number | Publication Date |
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| CN212158549U true CN212158549U (en) | 2020-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021021795.1U Active CN212158549U (en) | 2020-06-06 | 2020-06-06 | Strain gauge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780708A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Strain gauge |
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2020
- 2020-06-06 CN CN202021021795.1U patent/CN212158549U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780708A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Strain gauge |
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