CN108955505B - Device for monitoring dynamic state and surrounding rock state stability of highway tunnel - Google Patents
Device for monitoring dynamic state and surrounding rock state stability of highway tunnel Download PDFInfo
- Publication number
- CN108955505B CN108955505B CN201810857484.XA CN201810857484A CN108955505B CN 108955505 B CN108955505 B CN 108955505B CN 201810857484 A CN201810857484 A CN 201810857484A CN 108955505 B CN108955505 B CN 108955505B
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- monitoring
- surrounding rock
- swivel nut
- driving plate
- arm
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 74
- 239000011435 rock Substances 0.000 title claims abstract description 39
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 238000004873 anchoring Methods 0.000 claims description 18
- 238000007667 floating Methods 0.000 claims description 16
- 238000012806 monitoring device Methods 0.000 claims description 10
- 230000033001 locomotion Effects 0.000 claims description 3
- 238000011161 development Methods 0.000 claims description 2
- 230000018109 developmental process Effects 0.000 claims description 2
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 238000004804 winding Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 3
- 230000000007 visual effect Effects 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention belongs to the field of surrounding rock state monitoring systems, and particularly relates to a device for monitoring the dynamic state and the surrounding rock state stability of a highway tunnel. According to the invention, the transmission plate is in transmission connection with the monitoring hole formed in the top of the tunnel, when the monitoring hole is changed due to the surrounding rock state and pressure, the surrounding rock extrudes the transmission plate, the structure surrounded by the transmission plate is changed, so that the length of the monitoring rope is changed, the traction rope is driven to stretch, the take-up reel rotates along with the length of the monitoring rope, the sensing end of the rotation angle sensor rotates along with the take-up reel, and finally, the visual parameters of the surrounding rock change state are obtained. Compared with a transmission monitoring mode, the method can complete the change parameters of the surrounding rock state only through one monitoring hole, is particularly suitable for monitoring the pressure change of the broken rock stratum, is sensitive in monitoring, and has important significance for the safe operation of the tunnel.
Description
Technical Field
The invention belongs to the field of surrounding rock state monitoring systems, and particularly relates to a device for monitoring the dynamic state and the surrounding rock state stability of a highway tunnel.
Background
In the excavation process of highway tunnel, often can meet the weak and weak, loose, bad country rock conditions such as inflation or broken zone of fault, in tunnel country rock displacement monitoring, the displacement at monitoring section hole top is the most important, traditional monitoring mode sets up rings at monitoring section hole top, hang the scale on the rings, the while is motionless in the hole position sets up the scale, read from two scales with the spirit level, the difference of twice readings around the comparison, thereby calculate the displacement that takes place between two measurements, each measurement all need carry out above-mentioned work to every measuring point, not only it is difficult to obtain measured data, and measured accumulative error is also very big.
In addition, by adopting a laser positioning mode, a fixed position needs to be searched in tunnel surrounding rocks to be provided with a laser emitting device, a ruler hung at a point to be measured is irradiated by the laser emitting device, and monitoring data is obtained through the position change of a light spot on the ruler.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the device for monitoring the dynamic state and the surrounding rock state stability of the highway tunnel, which can effectively solve the problem of inconvenient installation of the monitoring device and improve the monitoring accuracy.
The invention adopts the specific technical scheme that:
monitoring highway tunnel developments and device of country rock state stability, including monitoring devices and monitor terminal, monitoring devices and monitor terminal communication connection, monitoring devices include fixed part, transmission portion and monitoring portion, the fixed part include the anchor bolt, the anchor bolt be shaft-like structure, the pole of anchor bolt on be provided with the barb, transmission portion include rotatory screw rod, lift swivel nut and driving plate, lift swivel nut and rotatory screw rod form screw thread lifting fit, rotatory screw rod upper end be connected with the tail end of anchor bolt is articulated, lift swivel nut be connected with the driving plate with the help of the spring arm, the spring arm include with lift swivel nut articulated lift arm and with driving plate articulated floating arm, lift arm and the articulated connection of floating arm, the end of floating arm stretch out outside the pin joint of lift arm and floating arm, the monitoring device is characterized in that a spring is arranged between the tail end of the floating arm and the lifting arm, the monitoring part comprises a threading ring and a monitoring rope, the threading ring and the monitoring rope are arranged on the back face of the transmission plate, the monitoring rope penetrates into the threading ring and annularly surrounds the outer side of the lifting screw sleeve, the monitoring rope is further connected with a traction rope, the traction rope is wound on a take-up reel, the take-up reel is connected with a rotation angle sensor, and the rotation angle sensor is in communication connection with a monitoring terminal.
The anchoring bolt is provided with an anti-smashing disc, and the anti-smashing disc and the anchoring bolt are fixed in a threaded mode.
The driving plate be provided with the multiunit around the lift swivel nut, the driving plate include mainboard and subplate, the mainboard be connected with the lift swivel nut, the subplate set up at the left and right sides symmetry of mainboard, subplate and mainboard between be provided with the torsional spring, the subplate have with the help of the torsional spring and deviate from the motion trend of lift swivel nut direction.
The lower end of the rotating screw is provided with a sealing disc, and the sealing disc is arranged on the lower side of the transmission plate.
The invention has the beneficial effects that:
according to the invention, the transmission plate is in transmission connection with the monitoring hole formed in the top of the tunnel, when the monitoring hole is changed due to the surrounding rock state and pressure, the surrounding rock extrudes the transmission plate, the structure surrounded by the transmission plate is changed, so that the length of the monitoring rope is changed, the traction rope is driven to stretch, the take-up reel rotates along with the length of the monitoring rope, the sensing end of the rotation angle sensor rotates along with the take-up reel, and finally, the visual parameters of the surrounding rock change state are obtained.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic view of the structure of section A-A in FIG. 1;
in the attached drawing, the device comprises an anchoring bolt 1, an anchoring bolt 2, an agnail 3, a rotary screw rod 4, a lifting screw sleeve 5, a lifting arm 6, a floating arm 7, a threading ring 8, a monitoring rope 9, a traction rope 10, a take-up reel 11, an anti-smashing reel 12, a main board 13, an auxiliary board 14, a sealing disc 101, a contact surface 102, a fixed surface 103, an air bag 104 and a supporting rod.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments:
the invention relates to a device for monitoring the dynamic state and the surrounding rock state stability of a highway tunnel, which comprises a monitoring device and a monitoring terminal, wherein the monitoring device is in communication connection with the monitoring terminal, the monitoring device comprises a fixing part, a transmission part and a monitoring part, the fixing part comprises an anchoring bolt 1, the anchoring bolt 1 is nailed into a monitoring hole for fixing the whole equipment into the monitoring hole, the anchoring bolt 1 is in a rod-shaped structure, a barb 2 is arranged on a rod body of the anchoring bolt 1, the transmission part comprises a rotating screw rod 3, a lifting screw sleeve 4 and a transmission plate, the lifting screw sleeve 4 and the rotating screw rod 3 form threaded lifting fit, the upper end of the rotating screw rod 3 is hinged with the tail end of the anchoring bolt 1, the lifting screw sleeve 4 is connected with the transmission plate by virtue of a spring arm, the spring arm comprises a lifting arm 5 hinged with the lifting screw sleeve 4 and a floating arm 6 hinged with the transmission plate, the lifting arm 5 is connected with the floating arm 6 in a hinged mode, the tail end of the floating arm 6 extends out of a hinged point of the lifting arm 5 and the floating arm 6, a spring is arranged between the tail end of the floating arm 6 and the lifting arm 5, the monitoring portion comprises a threading ring 7 and a monitoring rope 8, the threading ring 7 and the monitoring rope 8 are arranged at the back face of a transmission plate, the monitoring rope 8 penetrates through the threading ring 7 and annularly surrounds the outer side of the lifting screw sleeve 4, the monitoring rope 8 is further connected with a traction rope 9, the traction rope 9 is wound on a take-up reel 10, the take-up reel 10 is connected with a rotation angle sensor, and the rotation angle sensor is in communication connection with the monitoring terminal.
The rotary screw 3 is provided with a rotary nut, and an operator can conveniently adjust the rotary screw 3 by means of the rotary nut.
According to the invention, the transmission plate is in transmission connection with the monitoring hole formed in the top of the tunnel, when the monitoring hole is changed due to the surrounding rock state and pressure, the surrounding rock extrudes the transmission plate, the structure surrounded by the transmission plate is changed, so that the length of the monitoring rope 8 is changed, the traction rope 9 is driven to stretch, the take-up reel 10 rotates along with the length of the monitoring rope, the sensing end of the rotation angle sensor rotates along with the take-up reel, and finally, the visual parameters of the surrounding rock change state are obtained. Compared with a transmission monitoring mode, the method can complete the change parameters of the surrounding rock state only through one monitoring hole, is particularly suitable for monitoring the pressure change of the broken rock stratum, is sensitive in monitoring, and has important significance for the safe operation of the tunnel.
The invention realizes the pose adjustment of the transmission plate by virtue of the spring arms, when the device is installed, firstly, a monitoring hole positioned at the top of the tunnel is arranged, the anchoring bolt 1 is nailed in the monitoring hole, the rotating screw rod 3 is hinged with the anchoring bolt 1, the lifting screw sleeve 4 is lifted by adjusting the rotating screw rod 3, the rotating screw rod 3 is prevented from rotating and transmitting to the anchoring bolt 1 due to the hinging with the anchoring bolt 1, the connection stability of the barb 2 on the anchoring bolt 1 is ensured, the whole device is prevented from falling out of the monitoring hole, the lifting screw sleeve 4 is adjusted as shown in figure 1, the transmission plate is in close contact with the side wall of the monitoring hole, namely surrounding rock by virtue of the arrangement of a plurality of groups of spring arms, when the surrounding rock is displaced and changed, the transmission plate can sense in time, the position change of the transmission plate extrudes the spring arms, the angle formed by the lifting arms 5 and the floating arms 6 of the spring arms is changed, thereby ensuring the better, in case the transmission plate takes place the displacement, the elasticity of the becket of monitoring 8 constitution just changes, thereby make take-up reel 10 that has set up the reset coil spring take place forward or reverse rotation, it can sense the position change that comes from the transmission plate to have guaranteed rotation angle sensor, the sensor communicates the signal with monitoring terminal through wired or wireless mode, monitoring terminal is for setting up industrial computer or monitor inside the tunnel, and pass monitoring terminal's data outward in real time with the help of network connection, realize remote monitoring's technological effect, but realize the dynamic of backstage personnel real-time supervision tunnel and the stability parameter of country rock state.
Furthermore, in order to ensure the strict contact between the driving plate and the surrounding rock, on one hand, the driving plate and the lifting screw 4 form a four-bar kinematic pair by means of the matching of the rotating screw 3 and the lifting screw sleeve 4, wherein the spring arms play a role of forming a four-bar linkage and also play a role of absorbing the deformation of the driving plate, on the other hand, the driving plate further comprises a contact surface 101 and a fixed surface 102 which are separated, an air bag 103 is arranged between the two surfaces, supporting rods 104 with anti-back thorns are respectively arranged at the two sides of the air bag 103, the supporting rods 104 penetrate through the fixed surface 102, after the lifting screw sleeve 4 is adjusted to enable the driving plate to be tightly attached to the monitoring holes on the surrounding rock after the driving plate is installed in place, if the driving plate still has a gap with the hole wall, the air bag 103 is used for inflating, so that the supporting rods 104 are gradually pulled out of the fixed surface 102, the arranged anti-back thorns avoid the, and because the supporting rods 104 on the two sides can stretch out and draw back to different degrees due to the pushing of the air bags 103, the contact surface can be ensured to be deflected and attached to the hole wall to the maximum extent, so that the main board 12 and the auxiliary board 13 adopt the split structure, and the monitoring sensitivity is improved to the maximum extent.
Further, an anti-smashing disk 11 is arranged on the anchoring bolt 1, and the anti-smashing disk 11 and the anchoring bolt 1 are fixed in a threaded mode. The anti-smashing plate 11 is covered and buckled above the transmission plate, so that the transmission plate is prevented from being locked due to falling rocks, and the accuracy is improved.
Further, the driving plate be provided with the multiunit around lift swivel nut 4, the driving plate include mainboard 12 and subplate 13, mainboard 12 be connected with lift swivel nut 4, subplate 13 set up at the left and right sides symmetry of mainboard 12, subplate 13 and mainboard 12 between be provided with the torsional spring, subplate 13 have with the help of the torsional spring and deviate from the motion trend of 4 directions of lift swivel nut. The thimble 7 has all been set up behind mainboard 12 and the subplate 1 that set up, and the monitoring rope 8 of being convenient for passes, and mainboard 12 is with the help of spring arm and surrounding rock contact, and subplate 13 also with the help of the torsional spring and surrounding rock contact, and when the surrounding rock does not have the displacement, main subplate is all motionless, in case the surrounding rock state changes, mainboard 12 and subplate 13 take place the displacement thereupon and change to better sensitivity has been guaranteed.
Further, the lower end of the rotary screw 3 is provided with a sealing disc 14, and the sealing disc 14 is arranged on the lower side of the transmission plate. The sealed dish 14 that sets up seals the monitoring hole, avoids the driving plate card that the foreign object invasion led to dead, improve equipment's operating stability.
Claims (4)
1. Device of monitoring highway tunnel developments and country rock state stability, including monitoring devices, its characterized in that: the monitoring device include fixed part, transmission portion and monitoring portion, the fixed part include anchor bolt (1), anchor bolt (1) be shaft-like structure, the pole body of anchor bolt (1) on be provided with barb (2), the transmission portion include rotatory screw rod (3), lift swivel nut (4) and driving plate, lift swivel nut (4) and rotatory screw rod (3) form screw thread lift cooperation, rotatory screw rod (3) upper end be connected with the tail end of anchor bolt (1) is articulated, lift swivel nut (4) be connected with the driving plate with the help of the spring arm, the spring arm include with lift swivel nut (4) articulated support lift arm (5) and with driving plate articulated floating arm (6), support arm (5) and floating arm (6) articulated connection, the end of floating arm (6) stretch out outside the pin joint of support arm (5) and floating arm (6), the utility model discloses a take-up reel, including the lifting swivel nut, the monitoring portion is around lifting swivel nut (4), the monitoring portion is including setting up thimble (7) and monitoring rope (8) at the driving plate back, monitoring rope (8) alternate and be cyclic annular around in thimble (7) outside around lifting swivel nut (4), monitoring rope (8) still be connected with haulage rope (9), haulage rope (9) winding on take-up reel (10), take-up reel (10) be connected with rotation angle sensor, the driving plate still include contact surface (101) and stationary plane (102) of components of a whole that can function independently, be provided with gasbag (103) between the two sides, the both sides of gasbag (103) be provided with respectively and have bracing piece (104) of preventing moving back the thorn, bracing piece (104) pass stationary plane (102) and set up.
2. The device of claim 1, wherein the device is configured to monitor the dynamic state and the surrounding rock state stability of the road tunnel, and is further configured to: the anchoring bolt (1) is provided with an anti-smashing disk (11), and the anti-smashing disk (11) is in threaded fixation with the anchoring bolt (1).
3. The device of claim 1, wherein the device is configured to monitor the dynamic state and the surrounding rock state stability of the road tunnel, and is further configured to: the driving plate be provided with the multiunit around lift swivel nut (4), the driving plate include mainboard (12) and subplate (13), mainboard (12) be connected with lift swivel nut (4), subplate (13) set up at the left and right sides symmetry of mainboard (12), subplate (13) and mainboard (12) between be provided with the torsional spring, subplate (13) have with the help of the torsional spring and deviate from the motion trend of lift swivel nut (4) direction.
4. The device of claim 1, wherein the device is configured to monitor the dynamic state and the surrounding rock state stability of the road tunnel, and is further configured to: rotatory screw rod (3) lower extreme be provided with sealed dish (14), sealed dish (14) set up the downside at the driving plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810857484.XA CN108955505B (en) | 2018-07-31 | 2018-07-31 | Device for monitoring dynamic state and surrounding rock state stability of highway tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810857484.XA CN108955505B (en) | 2018-07-31 | 2018-07-31 | Device for monitoring dynamic state and surrounding rock state stability of highway tunnel |
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| Publication Number | Publication Date |
|---|---|
| CN108955505A CN108955505A (en) | 2018-12-07 |
| CN108955505B true CN108955505B (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810857484.XA Expired - Fee Related CN108955505B (en) | 2018-07-31 | 2018-07-31 | Device for monitoring dynamic state and surrounding rock state stability of highway tunnel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113465569B (en) * | 2021-06-02 | 2022-03-25 | 王艳彦 | Civil engineering structure deformation monitoring devices |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2890345Y (en) * | 2006-01-25 | 2007-04-18 | 吴江 | Pre-warning device capable of real-time monitoring |
| JP2007205741A (en) * | 2006-01-31 | 2007-08-16 | Tobishima Corp | Displacement measuring device using fbg optical fiber sensor |
| CN101418581A (en) * | 2008-11-21 | 2009-04-29 | 湖南大学 | Discrete material pile swelling capacity tester |
| CN204228152U (en) * | 2014-11-25 | 2015-03-25 | 长江勘测规划设计研究有限责任公司 | Stay-supported observation cabinet |
| CN205262453U (en) * | 2015-12-31 | 2016-05-25 | 威海晶合数字矿山技术有限公司 | Monitoring devices is warp in tunnel convergence |
| KR101657672B1 (en) * | 2016-04-28 | 2016-09-19 | 주식회사 세광종합기술단 | a underwater settlement plate for measuring settlement of a reclaimed land |
| CN205593478U (en) * | 2016-03-08 | 2016-09-21 | 吴文钦 | Overlying strata after coal mine goaf fills remove deformation monitoring system |
| CN107702634A (en) * | 2017-09-26 | 2018-02-16 | 十九冶成都建设有限公司 | Deformeter |
| CN107795322A (en) * | 2017-11-06 | 2018-03-13 | 山东建筑大学 | A kind of assembly concrete arc plate and checkerboard type prestress anchorage cable composite supporting construction and its construction method |
| CN207412139U (en) * | 2017-04-19 | 2018-05-29 | 重庆市永川区中医院 | A kind of clinical oral operation elastic dilatation device |
-
2018
- 2018-07-31 CN CN201810857484.XA patent/CN108955505B/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2890345Y (en) * | 2006-01-25 | 2007-04-18 | 吴江 | Pre-warning device capable of real-time monitoring |
| JP2007205741A (en) * | 2006-01-31 | 2007-08-16 | Tobishima Corp | Displacement measuring device using fbg optical fiber sensor |
| CN101418581A (en) * | 2008-11-21 | 2009-04-29 | 湖南大学 | Discrete material pile swelling capacity tester |
| CN204228152U (en) * | 2014-11-25 | 2015-03-25 | 长江勘测规划设计研究有限责任公司 | Stay-supported observation cabinet |
| CN205262453U (en) * | 2015-12-31 | 2016-05-25 | 威海晶合数字矿山技术有限公司 | Monitoring devices is warp in tunnel convergence |
| CN205593478U (en) * | 2016-03-08 | 2016-09-21 | 吴文钦 | Overlying strata after coal mine goaf fills remove deformation monitoring system |
| KR101657672B1 (en) * | 2016-04-28 | 2016-09-19 | 주식회사 세광종합기술단 | a underwater settlement plate for measuring settlement of a reclaimed land |
| CN207412139U (en) * | 2017-04-19 | 2018-05-29 | 重庆市永川区中医院 | A kind of clinical oral operation elastic dilatation device |
| CN107702634A (en) * | 2017-09-26 | 2018-02-16 | 十九冶成都建设有限公司 | Deformeter |
| CN107795322A (en) * | 2017-11-06 | 2018-03-13 | 山东建筑大学 | A kind of assembly concrete arc plate and checkerboard type prestress anchorage cable composite supporting construction and its construction method |
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| CN108955505A (en) | 2018-12-07 |
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