CN214121462U - Hollow bag strain gauge for preventing cementing agent from overflowing without pressure - Google Patents
Hollow bag strain gauge for preventing cementing agent from overflowing without pressure Download PDFInfo
- Publication number
- CN214121462U CN214121462U CN202120243961.0U CN202120243961U CN214121462U CN 214121462 U CN214121462 U CN 214121462U CN 202120243961 U CN202120243961 U CN 202120243961U CN 214121462 U CN214121462 U CN 214121462U
- Authority
- CN
- China
- Prior art keywords
- cementing agent
- guide head
- strain gauge
- rear end
- preventing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
A hollow bag strain gauge for preventing a cementing agent from overflowing without pressure comprises a guide head, an installation column, a direction finder and a strain gauge, wherein a cylindrical hole with an open front end is formed in the installation column, the cylindrical hole is filled with the cementing agent, the rear end part of the guide head extends into the front end opening of the cylindrical hole, a sealing ring in sliding sealing fit with the inner wall of the cylindrical hole is arranged on the outer circle of the rear end of the guide head, a positioning structure is arranged between the outer circle of the rear end of the guide head and the installation column, a cementing agent extrusion channel with an open rear end is formed in the guide head, and an elastic one-way valve is arranged in the cementing agent extrusion channel; the outer circumference of the mounting column is provided with a strain gauge and a positioning sleeve for fixing the strain gauge, the direction finder is coaxially mounted inside the rear side of the mounting column, and the rear end of the direction finder is connected with a cable which is connected with the strain gauge simultaneously. The utility model provides a difficult problem that the cementing agent outflows in advance when measuring rock mass initial stress, guarantee the accuracy of going on and measuring result in order of measurement process.
Description
Technical Field
The utility model belongs to the technical field of the ground stress measurement, concretely relates to prevent excessive hollow inclusion strainometer of cementing agent non-pressure.
Background
When the initial stress of a rock mass is measured by using a hole wall strain method, the strain before and after stress relief is usually measured by using a hollow inclusion strain gauge, so that the stress of the rock mass is calculated according to the strain. In the process of slowly pushing the strain gauge of the hollow bag body into the rock hole, the cementing agent poured into the hollow bag body has high mobility, so that the cementing agent easily flows out in advance under the condition that the front end has no pressure, the measurement result is inaccurate, and the measurement failure can be caused in serious cases.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the weak point among the prior art, provide a simple structure, can improve the hollow inclusion strainometer that prevents that cementing agent non-pressure is excessive of the measuring result degree of accuracy.
In order to solve the technical problem, the utility model adopts the following technical scheme: a hollow bag strain gauge for preventing a cementing agent from overflowing without pressure comprises a guide head, an installation column, a direction finder and a strain gauge, wherein a cylindrical hole with an open front end is formed in the installation column, the cylindrical hole is filled with the cementing agent, the rear end part of the guide head extends into the front end opening of the cylindrical hole, a sealing ring in sliding sealing fit with the inner wall of the cylindrical hole is arranged on the outer circle of the rear end of the guide head, a positioning structure is arranged between the outer circle of the rear end of the guide head and the installation column, a cementing agent extrusion channel with an open rear end is formed in the guide head, an elastic one-way valve is arranged in the cementing agent extrusion channel, and a cementing agent outflow hole communicated with the cementing agent extrusion channel is formed in the guide head; the outer circumference of the mounting column is provided with a strain gauge and a positioning sleeve for fixing the strain gauge, the direction finder is coaxially mounted inside the rear side of the mounting column, and the rear end of the direction finder is connected with a cable which is connected with the strain gauge simultaneously.
The cementing agent extrusion channel is a blind hole coaxially formed in the guide head, a step groove is formed in the orifice of the blind hole of the guide head, the diameter of the step groove is larger than that of the blind hole, a spring is arranged in the step groove of the guide head, a limiting ring is fixedly arranged at the notch of the step groove on the rear end face of the guide head, a blocking piece is arranged on the inner side of the limiting ring, and the rear end of the spring is in top pressure fit with the limiting ring through the blocking piece.
The guide head is preceding cone section, well cylinder section and back cylinder section from preceding back in proper order, and preceding cone section is thick cone structure behind the preceding sharp, and the external diameter of well cylinder section equals the back end maximum diameter of preceding cone section, and well cylinder section external diameter is greater than back cylinder section external diameter, and the excircle of well cylinder section is equipped with preceding sealing washer.
And a rear sealing ring is arranged on the excircle of the rear part of the mounting column.
An annular groove is formed in the middle of the mounting column in the circumferential direction, a digital temperature sensor is arranged in the annular groove, and a cable is connected with the digital temperature sensor.
The positioning structure comprises two positioning pins, the front end part of the mounting column is provided with two jacks with central symmetry along the radial direction, the excircle central symmetry of the rear end of the guide head is provided with two positioning grooves, the two positioning grooves are respectively communicated with the two jacks in a one-to-one correspondence manner, and the positioning pins are correspondingly inserted into the jacks and the positioning grooves to temporarily connect the guide head and the mounting column into a whole.
The orientation device is connected with the mounting column through radially arranged pins.
Adopt above-mentioned technical scheme, the utility model discloses when utilizing pore wall strain method to measure rock mass initial stress, beat required rock bore earlier and clear up the rock bore, the cementing agent of having transferred in proportion again and pour into appropriate amount cementing agent in the cylinder hole of erection column, then in inserting the front end of cylinder hole with direction head rear end, the constant head tank corresponds with the jack, inserts the locating pin and makes the erection column be connected as an organic wholely with the direction head. Then the front end of the installation rod is connected with the rear end of the installation column, the hollow bag body strain gauge is slowly fed into the rock hole, the baffle plate blocks the rear port of the cementing agent extrusion channel due to the elastic force of the spring in the process that the hollow bag body strain gauge moves in the hole, so as to prevent the cementing agent from overflowing, when the front end of the guide head reaches the bottom of the rock hole and contacts with the rock body, under the action of the external pressure of the forward propulsion of the installation rod, the positioning pin between the guide head and the installation column is subjected to the shearing force, the two positioning pins are cut off, the rear cylindrical section of the guide head extrudes the cementing agent in the cylindrical cavity, the pressure intensity of the cementing agent is rapidly increased, the pressure of the cementing agent on the baffle plate is larger than the elastic force of the spring, the baffle plate is separated from the limiting ring, the cementing agent breaks through the baffle plate and flows into the stepped groove, then enters the cementing agent extrusion channel, finally, and (3) completely extruding the cementing agent, solidifying the cementing agent between the rear cylindrical section and the hole wall of the rock hole by the strainmeter after the cementing agent is solidified, measuring the strain before and after the stress is relieved according to the strain gauge, and calculating the rock stress according to the strain.
The front sealing ring and the rear sealing ring play a role in limiting the forward or backward flow of the cementing agent, so that the cementing agent is solidified between the front sealing ring and the rear sealing ring and is solidified with the rock mass into a whole.
Digital temperature sensors are used to monitor temperature changes inside the rock bore.
The locating sleeve is made of epoxy resin, and the locating pin is made of aluminum wires and is easy to cut off.
To sum up, the utility model discloses utilize the spring check valve to provide certain elastic pressure for the cementing agent of cylinder intracavity under the circumstances of direction head non-pressure and prevent that it is excessive to cause measuring inaccurate, utilize the power of carrying the strainometer to open the spring check valve after entering into the rock cavern bottom, ensure that the cementing agent is extruded the cylinder chamber and is solidified as an organic wholely with the rock mass after the strainometer is carried to target in place to solve the difficult problem that the cementing agent outflows in advance when measuring the initial stress of rock mass, guarantee going on in order of measurement process and measuring result's accuracy.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is an enlarged view at a in fig. 1.
Detailed Description
As shown in fig. 1 and 2, the utility model discloses a prevent hollow inclusion strainometer that binder non-pressure is excessive, including direction head 1, erection column 2, direction finder 3 and foil gage 4, erection column 2 is inside to be seted up the open cylinder hole 5 in front, be filled with the cementing agent in the cylinder hole 5, direction head 1 rear end portion stretches into in the front end of cylinder hole 5, direction head 1 rear end excircle is equipped with the sealing ring 6 with cylinder hole 5 inner wall sliding seal cooperation, be equipped with location structure between direction head 1 rear end excircle and erection column 2, direction head 1 is inside to be equipped with rear end open-ended cementing agent extrusion channel, the inside elasticity check valve that is equipped with of cementing agent extrusion channel, direction head 1 is last to be seted up the cementing agent outflow hole 7 that communicates with cementing agent extrusion channel; the outer circumference of the mounting column 2 is provided with a strain gauge 4 and a positioning sleeve 8 for fixing the strain gauge 4, the direction finder 3 is coaxially mounted inside the rear side of the mounting column 2, and the rear end of the direction finder 3 is connected with a cable 9 which is simultaneously connected with the strain gauge 4.
The cementing agent extrusion channel is a blind hole 10 coaxially arranged in the guide head 1, a step groove 11 is formed in the orifice of the blind hole 10 of the guide head 1, the diameter of the step groove 11 is larger than that of the blind hole 10, a spring 12 is arranged in the step groove 11 of the guide head 1, a limiting ring 13 is fixedly arranged on the rear end face of the guide head 1 at the notch of the step groove 11, a baffle piece 14 is arranged on the inner side of the limiting ring 13, and the rear end of the spring 12 is in top pressing fit with the limiting ring 13 through the baffle piece 14.
The guide head 1 is a front cone section, a middle cylinder section and a rear cylinder section from front to back in sequence, the front cone section is a cone structure with a front tip and a rear tip, the outer diameter of the middle cylinder section is equal to the maximum diameter of the rear end of the front cone section, the outer diameter of the middle cylinder section is larger than that of the rear cylinder section, and a front sealing ring 15 is arranged on the outer circle of the middle cylinder section.
The excircle of the rear part of the mounting column 2 is provided with a rear sealing ring 16.
An annular groove 17 is formed in the middle of the mounting column 2 along the circumferential direction, a digital temperature sensor 18 is arranged in the annular groove 17, and the cable 9 is connected with the digital temperature sensor 18.
The positioning structure comprises two positioning pins 19, the front end part of the mounting column 2 is radially provided with two jacks with central symmetry, the excircle central symmetry of the rear end of the guide head 1 is provided with two positioning grooves, the two positioning grooves are respectively communicated with the two jacks in a one-to-one correspondence manner, and the positioning pins 19 are correspondingly inserted in the jacks and the positioning grooves to temporarily connect the guide head 1 and the mounting column 2 into a whole.
The orientation device 3 is connected to the mounting post 2 by means of radially arranged pins 20.
The utility model discloses when utilizing pore wall strain method to measure rock mass initial stress, beat required rock bore earlier and clear up the rock bore, the cementing agent has been transferred in proportion again and appropriate amount cementing agent is poured into in the cylinder hole 5 of erection column 2, then in inserting the front end of cylinder hole 5 with leading 1 rear end, the constant head tank corresponds with the jack, inserts locating pin 19 and makes erection column 2 be connected as an organic wholely with leading 1. Then the front end of the installation rod is connected with the rear end of the installation column 2, the hollow bag body strain gauge is slowly sent into the rock hole, in the process that the hollow bag body strain gauge moves in the hole, due to the elastic force of the spring 12, the blocking piece 14 blocks the rear port of the cementing agent extrusion channel, so that the outflow of the cementing agent is prevented, when the front end of the guide head 1 reaches the bottom of the rock hole and is contacted with a rock body, under the action of the external pressure of the forward pushing of the installation rod, the positioning pin 19 between the guide head 1 and the installation column 2 is subjected to shearing force, the two positioning pins 19 are cut off, the rear cylindrical section of the guide head 1 extrudes the cementing agent in the cylindrical cavity, the pressure of the cementing agent is rapidly increased, the pressure of the cementing agent on the blocking piece 14 is larger than the elastic force of the spring 12, the blocking piece 14 is separated from the limiting ring 13, the cementing agent breaks through the blocking piece 14 and flows into, and after the rear end of the guide head 1 is contacted with the bottom of the cylindrical cavity, the cementing agent is completely extruded out, the cementing agent is arranged between the rear cylindrical section and the hole wall of the rock hole, the strain gauge is solidified with an external rock body after the cementing agent is solidified, finally, the strain before and after the stress is relieved can be measured according to the strain gauge 4, and the rock body stress is calculated according to the strain.
The front sealing ring 15 and the rear sealing ring 16 play a role in limiting the forward or backward flowing of the cementing agent, so that the cementing agent is solidified between the front sealing ring 15 and the rear sealing ring 16 and is solidified with the rock mass into a whole.
The digital temperature sensor 18 is used to monitor temperature changes inside the rock bore.
The positioning sleeve 8 is made of epoxy resin, and the positioning pin 19 is made of aluminum wires and is easy to cut.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any form, and all of the technical matters of the present invention belong to the protection scope of the present invention to any simple modification, equivalent change and modification made by the above embodiments.
Claims (7)
1. The utility model provides a prevent that binder is non-pressure excessive hollow inclusion strainometer which characterized in that: the guide head comprises a guide head, an installation column, a direction finder and a strain gauge, wherein a cylindrical hole with an open front end is formed in the installation column, cementing agent is filled in the cylindrical hole, the rear end part of the guide head extends into the front end port of the cylindrical hole, a sealing ring in sliding sealing fit with the inner wall of the cylindrical hole is arranged on the outer circle of the rear end of the guide head, a positioning structure is arranged between the outer circle of the rear end of the guide head and the installation column, a cementing agent extrusion channel with an open rear end is formed in the guide head, an elastic one-way valve is arranged in the cementing agent extrusion channel, and a cementing agent outflow hole communicated with the cementing agent extrusion channel is formed in the guide head; the outer circumference of the mounting column is provided with a strain gauge and a positioning sleeve for fixing the strain gauge, the direction finder is coaxially mounted inside the rear side of the mounting column, and the rear end of the direction finder is connected with a cable which is connected with the strain gauge simultaneously.
2. The strain gauge for a hollow inclusion capable of preventing pressureless outflow of cementing agent according to claim 1, is characterized in that: the cementing agent extrusion channel is a blind hole coaxially formed in the guide head, a step groove is formed in the orifice of the blind hole of the guide head, the diameter of the step groove is larger than that of the blind hole, a spring is arranged in the step groove of the guide head, a limiting ring is fixedly arranged at the notch of the step groove on the rear end face of the guide head, a blocking piece is arranged on the inner side of the limiting ring, and the rear end of the spring is in top pressure fit with the limiting ring through the blocking piece.
3. The strain gauge for a hollow inclusion capable of preventing pressureless outflow of cementing agent according to claim 1, is characterized in that: the guide head is preceding cone section, well cylinder section and back cylinder section from preceding back in proper order, and preceding cone section is thick cone structure behind the preceding sharp, and the external diameter of well cylinder section equals the back end maximum diameter of preceding cone section, and well cylinder section external diameter is greater than back cylinder section external diameter, and the excircle of well cylinder section is equipped with preceding sealing washer.
4. The strain gauge for a hollow inclusion capable of preventing pressureless outflow of cementing agent according to claim 1, is characterized in that: and a rear sealing ring is arranged on the excircle of the rear part of the mounting column.
5. The strain gauge for a hollow inclusion capable of preventing pressureless outflow of cementing agent according to claim 1, is characterized in that: an annular groove is formed in the middle of the mounting column in the circumferential direction, a digital temperature sensor is arranged in the annular groove, and a cable is connected with the digital temperature sensor.
6. The strain gauge for a hollow inclusion capable of preventing pressureless outflow of cementing agent according to claim 1, is characterized in that: the positioning structure comprises two positioning pins, the front end part of the mounting column is provided with two jacks with central symmetry along the radial direction, the excircle central symmetry of the rear end of the guide head is provided with two positioning grooves, the two positioning grooves are respectively communicated with the two jacks in a one-to-one correspondence manner, and the positioning pins are correspondingly inserted into the jacks and the positioning grooves to temporarily connect the guide head and the mounting column into a whole.
7. The strain gauge for a hollow inclusion capable of preventing pressureless outflow of cementing agent according to claim 1, is characterized in that: the orientation device is connected with the mounting column through radially arranged pins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120243961.0U CN214121462U (en) | 2021-01-28 | 2021-01-28 | Hollow bag strain gauge for preventing cementing agent from overflowing without pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120243961.0U CN214121462U (en) | 2021-01-28 | 2021-01-28 | Hollow bag strain gauge for preventing cementing agent from overflowing without pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214121462U true CN214121462U (en) | 2021-09-03 |
Family
ID=77496071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120243961.0U Active CN214121462U (en) | 2021-01-28 | 2021-01-28 | Hollow bag strain gauge for preventing cementing agent from overflowing without pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214121462U (en) |
-
2021
- 2021-01-28 CN CN202120243961.0U patent/CN214121462U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11859493B2 (en) | Device for monitoring horizontal extrusion force of roof rock strata and method using the same | |
| CN214121462U (en) | Hollow bag strain gauge for preventing cementing agent from overflowing without pressure | |
| CN110849524A (en) | Fixing device and mounting method for soil pressure box of shield tunnel | |
| CN111076848A (en) | Pressure measuring device and method | |
| CN205538058U (en) | Novel ground stress test device | |
| CN113820059B (en) | Positioning device for hollow inclusion for ground stress measurement and use method | |
| BR102016001988A2 (en) | system for mounting an annular component on an axis | |
| CN109944281B (en) | Load box and measuring method thereof | |
| CN112729632A (en) | Hollow bag strain gauge for preventing cementing agent from overflowing without pressure | |
| CN112461189B (en) | Ground stress measuring strain gauge | |
| CN203534738U (en) | Borehole stressmeter with force-measuring direction thereof to be accurately controlled | |
| CN219327892U (en) | Internal expansion type plugging head | |
| CN216081844U (en) | Novel three-dimensional stress monitoring device for stope surrounding rock | |
| CN211849372U (en) | Novel static sounding probe | |
| CN111238719B (en) | Grouting pressure sensing device | |
| CN212409822U (en) | Water level monitoring device for hydraulic engineering | |
| CN212513449U (en) | Pressure monitoring valve for coal mine paste filling | |
| CN204299525U (en) | The collapsible guider of a kind of casing patching taper | |
| CN104200939B (en) | Crimping system | |
| CN210426418U (en) | Slope deformation monitoring and early warning device | |
| CN208528046U (en) | Injection device of die casting machine | |
| CN115420251B (en) | Twelve-component small-aperture hole bottom strain gauge | |
| CN114088262B (en) | Hollow inclusion stress meter with visual guiding and positioning functions and use method thereof | |
| CN117782382A (en) | Hollow inclusion stress meter capable of accurately sensing whole installation process and use method | |
| US11867062B2 (en) | Construction method for deformable anchor cable capable of being prestressed |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |