CN214702119U - Tunnel deep surrounding rock loosening ring deformation measuring device - Google Patents
Tunnel deep surrounding rock loosening ring deformation measuring device Download PDFInfo
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- CN214702119U CN214702119U CN202120828481.0U CN202120828481U CN214702119U CN 214702119 U CN214702119 U CN 214702119U CN 202120828481 U CN202120828481 U CN 202120828481U CN 214702119 U CN214702119 U CN 214702119U
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Abstract
The utility model discloses a tunnel deep surrounding rock loosening ring deformation measuring device, which comprises an in-hole measuring device, an external power supply device and a data acquisition device; the in-hole measuring device comprises a measuring rod and a displacement sensor, wherein the measuring rod is a steel bar measuring rod and is arranged in the tunnel surrounding rock measuring hole; the measuring rod and the tunnel surrounding rock are anchored into a whole by a steel bar anchoring agent, and the tunnel surrounding rock moves along the radial direction to drive the measuring rod to move; the front end of the measuring rod is connected with the movable end of a displacement sensor through a welded connecting sheet, the displacement sensor is an LVDT displacement sensor, and the displacement sensor is arranged on a displacement sensor bracket; the data acquisition device is connected with the displacement sensor through a signal output line, and the data acquisition instrument is connected with the data processing computer; the utility model discloses can realize carrying out long-time high accuracy continuous measurement to the deep country rock of arbitrary degree of depth, can carry out whole control measurement to country rock pine circle, help evaluating the country rock stability behind the tunnel excavation, guarantee tunnel construction safety.
Description
Technical Field
The utility model relates to a tunnel country rock displacement measurement technique especially relates to deep tunnel country rock loose circle deformation measuring device.
Background
When the tunnel is excavated, the surrounding rock is disturbed to generate stress redistribution, so that the stress state is changed from three dimensions to approximate two dimensions, and the strength of the surrounding rock is reduced. When the strength of the rock mass surrounding rock is lower than the redistribution stress value, the rock mass surrounding rock is damaged, and a loose crushing zone is formed gradually, wherein the loose crushing zone is called a surrounding rock loosening ring. The rock mass is in the yield state in the broken zone of relaxation, if local country rock stress is greater than rock mass intensity, the country rock will be destroyed, brings the safety risk to tunnel primary structure and stability. The surrounding rock loosening ring is continuously changed along with the progress of tunnel construction, and finally reaches a stable state. In engineering design, the thickness of the surrounding rock loose ring is difficult to accurately determine, and the design of a supporting structure cannot be carried out according to the preset thickness of the loose ring. Therefore, the deformation measurement of the loose circle of the surrounding rock is carried out during construction, so that the adjustment of the primary support structure of the tunnel and the evaluation of the stability of the surrounding rock are facilitated.
The existing method for measuring deformation of the loose ring of the deep tunnel surrounding rock mainly comprises field test, and the test mode comprises a sound wave test method, a geological radar test method and a multipoint displacement meter measurement method. The sound wave test method, the geological radar test method and the multipoint displacement meter measurement method are single tests, long-term continuous measurement cannot be realized, and the multipoint displacement meter is low in precision and difficult to measure micro deformation. The better measurement of the deformation of the loosening ring of the tunnel surrounding rock is the problem of further research in the tunnel surrounding rock engineering at present.
SUMMERY OF THE UTILITY MODEL
To the problem that current deep tunnel country rock pine circle warp the measurement and exists, the utility model discloses release a deep tunnel country rock pine circle warp measuring device, realize the long-term continuous monitoring that the pine circle of country rock warp.
The utility model relates to a measuring device is warp to deep country rock looseness circle in tunnel, measuring device include downthehole measuring device, outside power supply unit and data acquisition device.
The measuring device in the hole comprises a measuring rod and a displacement sensor, wherein the measuring rod is a steel bar measuring rod with the diameter of 10mm and is arranged in the tunnel surrounding rock measuring hole. The measuring hole is a drilled hole on the tunnel surrounding rock, and the aperture of the drilled hole is phi 50 mm. The measuring rod and the tunnel surrounding rock are anchored into a whole by the steel bar anchoring agent, and the tunnel surrounding rock moves along the radial direction to drive the measuring rod to move. The measuring rod is connected with the movable end of the displacement sensor through a welded connecting sheet, and the displacement sensor monitors displacement of the tunnel surrounding rock loosening ring. The displacement sensor is an LVDT displacement sensor.
And a fixed support is arranged in the measuring hole, and the fixed support and the surface of the tunnel surrounding rock are fastened by an anchor bolt.
And a displacement sensor support is welded above the fixed support, and the displacement sensor is arranged on the displacement sensor support. A round buckle capable of adjusting tightness is arranged above the displacement sensor support, and the buckle is screwed down to fix the displacement sensor.
And the external power supply device is connected with the displacement sensor through a power line led out by the direct current converter.
The data acquisition device is connected with the displacement sensor through a signal output line, and the data acquisition instrument is connected with the data processing computer.
The hole opening of the measuring hole is provided with a hole sealing cover, and the hole sealing cover is provided with a reserved hole for leading out a power line and a signal output line.
The utility model relates to a during deep loose circle displacement measurement device of country rock was used, at first will confirm the measurement position according to the engineering data in tunnel, then drilling installation measuring stick and displacement sensor, the data acquisition appearance of reconnection with the computer link. And (3) mounting measuring devices at three positions of the vault, the arch waist and the side wall of the tunnel excavation section, and continuously measuring the displacement of the loose ring of the deep layer of the surrounding rock to obtain a continuous displacement-time curve of the rock layer with the target depth.
The utility model relates to a tunnel country rock deep layer pine circle displacement measurement device can realize carrying out long-time high accuracy continuous measurement to the deep country rock of arbitrary degree of depth, on-the-spot simple to operate, the cost drops into lowly, engineering practicality is strong, can obtain the scope of pine circle more accurately, can accurately obtain from excavating to two lining construction period country rock pine circle displacement-time variation, carry out whole monitoring measurement to country rock pine circle, help evaluating the country rock stability behind the tunnel excavation, the parameter is strutted in the adjustment design in time simultaneously, guarantee tunnel construction safety.
Drawings
Fig. 1 is a schematic view of the section provided in the measuring hole of the present invention.
Fig. 2 is a schematic structural view of the measuring device in the hole of the present invention.
Fig. 3 is a schematic view of the present invention installed in a tunnel.
Fig. 4 is a schematic plan view of the hole sealing cap for drilling according to the present invention.
The notation in the figure is:
1. measuring rod 2 and steel bar anchoring agent
3. Connecting sheet 4 and fixing support for measuring rod
5. Displacement sensor 6 and hole sealing cover
7. Displacement sensor support, 8, displacement sensor power cord
9. Signal output line 10, fixed bolster anchor hole
11. Data acquisition instrument 12 and data processing computer
13. Section arch crown 14 and section arch waist
15. Section side wall 16, data transmission line preformed hole
17. Preformed hole of power supply line
Detailed Description
The present invention will be further explained with reference to the accompanying drawings. Fig. 1 and 2 show the basic structure of the present invention, fig. 3 shows the present invention, which sets up the situation at multiple points in the tunnel, and fig. 4 shows the situation of the hole sealing cap for drilling.
As shown in the figure, the utility model relates to a deep country rock pine circle in tunnel warp measuring device, measuring device include downthehole measuring device, outside power supply unit and data acquisition device.
The measuring device in the hole comprises a measuring rod 1 and a displacement sensor 5, wherein the measuring rod 1 is a steel bar measuring rod with the diameter of 10mm and is arranged in the tunnel surrounding rock measuring hole. The measuring hole is a drilled hole on the tunnel surrounding rock, and the aperture of the drilled hole is phi 50 mm. The measuring rod 1 and the tunnel surrounding rock are anchored into a whole by the steel bar anchoring agent 2, and the tunnel surrounding rock moves along the radial direction to drive the measuring rod 1 to move. The front end of the measuring rod 1 is connected with the movable end of the displacement sensor 5 through the welded connecting sheet 3, and the measuring rod 1 moves to drive the movable end of the displacement sensor 5 to move, so that the displacement sensor 5 monitors the displacement of the tunnel surrounding rock loosening ring. The displacement sensor 5 is an LVDT displacement sensor, the precision requirement error is not more than 0.02mm, and the measuring range is not less than 20 mm.
And a fixed support 4 is arranged in the measuring hole, and the fixed support 4 and the surface of the tunnel surrounding rock are fastened by an anchor bolt.
And a displacement sensor bracket 7 is welded above the fixed bracket 4, and the displacement sensor 5 is arranged on the displacement sensor bracket 7. And a round buckle capable of adjusting tightness is arranged above the displacement sensor support 7, and the buckle is screwed down to fix the displacement sensor 5.
The external power supply device is connected with the displacement sensor 5 through a power line 8 led out by the direct current converter. The displacement sensor power line 8 is connected with a 12V direct current power supply, and a 240V or 380V alternating current-to-12V direct current converter is required to be additionally installed on the 12V direct current power supply of part of tunnels.
The data acquisition device is connected with the displacement sensor 5 through a signal output line 9, and the data acquisition instrument 11 is connected with the data processing computer 12. After data are continuously acquired, the surrounding rock loosening ring displacement-time data are imported into the data processing computer 12 in an Excel format.
The hole opening of the measuring hole is provided with a hole sealing cover 6, a preformed hole, a data transmission line preformed hole 16 and a power supply line preformed hole 17 are arranged on the hole sealing cover 6 and used for leading out a signal output line 9 and a power supply line 8.
And drilling holes at three positions of the arch crown 13, the arch waist 14 and the side wall 15 of the tunnel excavation section, and continuously measuring the displacement of the loose ring of the deep layer of the surrounding rock to obtain a continuous displacement-time curve of the rock stratum at the target depth.
Claims (6)
1. A tunnel deep surrounding rock loosening ring deformation measuring device is characterized by comprising an in-hole measuring device, an external power supply device and a data acquisition device, wherein the in-hole measuring device comprises a measuring rod and a displacement sensor and is arranged in a measuring hole, and the measuring hole is a drilled hole in the tunnel surrounding rock; the measuring rod and the tunnel surrounding rock are anchored into a whole by a steel bar anchoring agent, and the tunnel surrounding rock moves along the radial direction to drive the measuring rod to move; the front end of the measuring rod is connected with the movable end of the displacement sensor through a welded connecting sheet, and the displacement sensor monitors displacement of the tunnel surrounding rock loosening ring.
2. The device for measuring the deformation of the loosening ring of the surrounding rock at the deep layer of the tunnel according to claim 1, wherein the measuring rod is a reinforcing steel bar measuring rod, the diameter of the reinforcing steel bar measuring rod is 10mm, and the measuring rod is arranged in a measuring hole of the surrounding rock of the tunnel; the measuring hole is a drilled hole in the surrounding rock of the tunnel, and the aperture of the drilled hole is phi 50 mm.
3. The device for measuring the loosening ring deformation of the deep surrounding rock of the tunnel according to claim 1, wherein a fixed bracket is arranged in the measuring hole, and the fixed bracket and the surface of the surrounding rock of the tunnel are fastened by an anchor bolt; the displacement sensor support is welded above the fixing support, the displacement sensor is arranged on the displacement sensor support, the round buckle capable of adjusting tightness is arranged above the displacement sensor support, and the buckle is screwed down to fix the displacement sensor.
4. The device for measuring the deformation of the loosening ring of the surrounding rock in the deep layer of the tunnel according to claim 1, wherein the displacement sensor is an LVDT displacement sensor, the measurement accuracy error is not more than 0.02mm, and the measurement range is not less than 20 mm.
5. The device for measuring the deformation of the loosening ring of the surrounding rock in the deep layer of the tunnel according to claim 1, wherein the data acquisition device is connected with the displacement sensor through a signal output line, and the data acquisition instrument is connected with a data processing computer.
6. The device for measuring the deformation of the loose collar of the deep surrounding rock of the tunnel according to claim 1, wherein the opening of the measuring hole is provided with a hole sealing cover, and the hole sealing cover is provided with a reserved hole for leading out a power line and a signal output line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120828481.0U CN214702119U (en) | 2021-04-21 | 2021-04-21 | Tunnel deep surrounding rock loosening ring deformation measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120828481.0U CN214702119U (en) | 2021-04-21 | 2021-04-21 | Tunnel deep surrounding rock loosening ring deformation measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214702119U true CN214702119U (en) | 2021-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120828481.0U Active CN214702119U (en) | 2021-04-21 | 2021-04-21 | Tunnel deep surrounding rock loosening ring deformation measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214702119U (en) |
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2021
- 2021-04-21 CN CN202120828481.0U patent/CN214702119U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220518 Address after: 300308 No.109, East 7th Road, Tianjin Binhai New Area pilot free trade zone (Airport Economic Zone) Patentee after: CHINA RAILWAY DESIGN Corp. Patentee after: Creec (Tianjin) Engineering Co., Ltd Address before: No. 109, East seventh Road, Airport Economic Zone, Binhai New Area, Tianjin 300308 Patentee before: CHINA RAILWAY DESIGN Corp. |