CN212454550U - Multi-parameter monitoring sensor arrangement structure for overlying rock stratum of coal mining subsidence area - Google Patents
Multi-parameter monitoring sensor arrangement structure for overlying rock stratum of coal mining subsidence area Download PDFInfo
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- CN212454550U CN212454550U CN202021827302.3U CN202021827302U CN212454550U CN 212454550 U CN212454550 U CN 212454550U CN 202021827302 U CN202021827302 U CN 202021827302U CN 212454550 U CN212454550 U CN 212454550U
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Abstract
A multi-parameter monitoring sensor arrangement structure of an overlying rock stratum of a coal mining subsidence area comprises a grouting pipe, an inclinometer pipe and a seepage pipe, and S1; carrying out hole positioning and measuring point placement, and drilling the overburden layer in the subsidence area by using a drilling machine; s2, binding the steel strand, the grouting pipe and the inclinometer pipe or the osmosizing pipe from outside to inside through a fixing device to form a three-pipe group; or, directly tie inclinometer pipe and slip casting pipe through fixing device and form two nest of tubes, the utility model aims at providing a monitoring technology who monitors simultaneously in same drilling that the rock shifts, hydrology, stress, inside subside isoparametric monitoring to realize monitoring simultaneously to same monitoring position displacement of rock, hydrology, stress isoparametric, because the drilling is dark and installation space is narrow and small, ingenious design and construction process can be compatible and greatly reduced drilling tunnelling expense of three kinds of sensors. The cost is 1/3-1/4 of the traditional scheme.
Description
Technical Field
The utility model relates to a sensor arrangement structure, concretely relates to coal mining subsidence area overlying strata multi-parameter monitoring sensor arrangement method and structure belongs to coal mining subsidence area overlying strata construction parameter monitoring technical field.
Background
At present, when monitoring parameters such as rock migration, hydrology, stress and the like in overlying strata of a domestic coal mining subsidence area, the condition that one hole is used is still adopted, namely when monitoring stress, rock migration, hydrology and internal settlement data, a special hole special mode can only be adopted, and three drilling holes are needed for monitoring three parameters. This has two disadvantages: firstly, three state parameters of the same monitoring area cannot be obtained, namely a rock movement parameter of one area, a hydrological parameter of the other area and a stress parameter of the third area; secondly, the cost is too high, three drill holes are needed to obtain three parameters, and the drill holes in the coal mining subsidence area pass through the goaf, so the drilling and tunneling cost is high. Accordingly, there is a need for a sensor arrangement and method that enables multiple uses of a single orifice while simultaneously monitoring multiple parameters.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the utility model provides a coal mining subsidence district overburden multiparameter monitoring sensor arrangement structure, realizes that a hole is multi-purpose, monitors multiple parameter simultaneously, reduces construction cost and degree of difficulty.
In order to realize the technical purpose, the utility model discloses a technical scheme as follows: a method for arranging sensors for monitoring multiple parameters of an overlying rock stratum in a coal mining subsidence area comprises a grouting pipe, an inclinometer pipe and a seepage pipe, and is characterized by comprising the following steps:
s1; drilling the overburden rock in the subsidence area by using an electric coal drill, and arranging a steel cable winch or a stress bracket at the orifice of the drilled hole;
s2, binding the steel strand, the grouting pipe and the inclinometer pipe or the osmosizing pipe from outside to inside through a fixing device to form a three-pipe group; or directly binding the inclinometer pipe or the grouting pipe and the grouting pipe through a fixing device to form two pipe groups;
s3, when the three-tube group in S2 is adopted, an anchoring section is connected to the bottom of the steel strand to serve as a stress monitoring front end; when the two pipe groups are adopted, a steel bar stress meter is arranged at the bottom end of the inclinometer pipe or the infiltration pipe;
s4, after the installation of S1-S3 is finished, naturally lowering the three tube sets or two tube sets to the bottom of the hole in the drill hole;
s5, grouting into the grouting pipe until reaching the designated elevation;
s6, when grouting is finished, when an inclinometer and an osmometer are adopted in the S2, the osmometer and the inclinometer are installed in sequence according to a design scheme after being checked and corrected, so that the guide wheel completely enters the guide groove; when the osmometer three-tube group is adopted in S2, after the no-load state measurement value is carried out on the osmometer, the osmometer is hoisted to the designed installation elevation of the osmometer;
and S7, connecting the cable of the sensing element with a power supply system, a data communication system and a back-end system.
And drilling a floral tube at the position of the inclinometer or the osmometer corresponding to the osmometer.
And when the buoyancy is too large in the natural downward process in the S4, filling clear water into the grouting pipe or using a drilling machine for assistance.
The grouting height in the S5 is 5% -15% of the hole depth.
Preferably, the osmometer is subjected to rust prevention, water prevention, corrosion prevention and high water pressure prevention treatment, immersed in water to reach a saturated state, and packaged on the measuring head by utilizing the non-woven geotextile; and before the inclinometer is placed, the inclinometer is tested and placed by using the analog inclinometer.
Preferably, when a triple tube stack is used in S3, the steel strands are pre-stressed prior to installation of the anchor line strain gauges.
The utility model provides a coal mining subsidence district overburden multi-parameter monitoring sensor arranges, includes the coal electric drill that is used for carrying out the drilling to and be used for carrying out the slip casting pipe of slip casting to the drilling, its characterized in that: a monitoring pipe group is arranged adjacent to the grouting pipe; a monitoring element is arranged in the monitoring pipe group; the monitoring element is connected with a back-end system through a communication cable.
And a monitoring pipeline is arranged in the same hole position, so that one hole has multiple purposes.
Preferably, the monitoring tube group comprises a seepage tube and/or a gradient tube; the outer sides of the grouting pipe and the monitoring pipe group are coated with steel stranded wires; the monitoring element comprises an inclinometer or an osmometer.
Preferably, said osmometer is located at the bottom of said borehole; the inclinometer is positioned in the inclinometer pipe; the bottom of the steel strand is provided with an anchor cable stress meter, or the bottom of the inclinometer pipe is provided with a steel bar stress meter.
Preferably, the inclinometer pipes are connected through an inclinometer pipe connecting joint; the aperture of the drill hole is 90-146 mm; the outer diameter of the steel strand is 15-16 mm; the outer diameter of the osmotic pressure pipe is 50-55 mm; the outer diameter of the inclinometer pipe is 65-75 mm.
The utility model aims at providing a monitoring technology of simultaneous monitoring displacement of rock, hydrology, stress isoparametric monitoring in same drilling to the realization is to the simultaneous monitoring of same monitoring point position displacement of rock, hydrology, stress isoparametric, because the drilling is dark and installation space is narrow and small, ingenious design and construction process can be compatible and greatly reduced drilling tunnelling expense of three kinds of sensors. The cost is 1/3-1/4 of the traditional scheme.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of a distribution cross-section of a pipeline according to a first embodiment.
Fig. 2 is a schematic diagram of a distribution cross-section of a pipeline according to a second embodiment.
Fig. 3 is a schematic diagram of the distribution structure of the inclinometer pipe, the steel strand and the cable in the first embodiment.
Fig. 4 is a schematic view of the distribution structure of the inclinometer and the inclinometer pipe connecting joint in the second embodiment.
Fig. 5 is a schematic diagram of the distribution structure of the inclinometer.
FIG. 6 is a schematic view showing the installation of osmometer
In the figure, 1 is a grouting pipe, 2 is an inclinometer pipe, 3 is a steel strand, 4 is an inclinometer, 5 is an osmometer, 6 is an inclinometer pipe connecting joint, and 7 is a cable.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the following description, for purposes of clarity, not all features of an actual implementation are described, well-known functions or constructions are not described in detail since they would obscure the invention with unnecessary detail, it being understood that in the development of any actual embodiment, numerous implementation details must be set forth in order to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, changing from one implementation to another, and it being recognized that such development efforts may be complex and time consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art.
Example one
Referring to fig. 1 and 3, a method for arranging a multi-parameter monitoring sensor for an overburden layer in a coal mining subsidence area comprises a grouting pipe, an inclinometer pipe and a seepage pipe:
s1; performing hole positioning and measuring point placement, drilling the overburden rock in the subsidence area by using a drilling machine, and arranging a construction grout stopping wall at a drilling hole opening;
s2, binding the steel strand, the grouting pipe and the inclinometer pipe through a fixing device from outside to inside to form a three-pipe group;
s3, when the three-tube group in S2 is adopted, an anchoring section is connected to the bottom of the steel strand to serve as a stress monitoring front end; when the two pipe groups are adopted, the steel bar stress meter is arranged at the bottom end of the inclinometer pipe through the thin turns of wires, so that the steel bar stress meter is arranged in parallel to the stress direction of the inclinometer pipe structure;
s4, after the installation of S1-S3 is finished, naturally lowering the three tube groups to the bottom of the hole in the drill hole;
s5, grouting into the grouting pipe until reaching the designated elevation;
s6, when grouting is finished, when an inclinometer pipe three-pipe group is adopted in S2, the inclinometer and the osmometer are checked and corrected, then the osmometer is installed at the bottom of the hole, and then the inclinometer is placed in the inclinometer pipe to enable the guide wheel to completely enter the guide groove;
and S7, connecting the cable of the sensing element with a power supply system and a back-end system.
And a floral tube is drilled at the bottom of the inclinometer pipe.
Specifically, in this embodiment, the inclinometer and the grouting pipe are bound by a steel strand, and the corresponding osmometer is placed at the bottom of the borehole, and the hydraulic parameters in the borehole are collected by the osmometer. The inclinometer is placed into the inclinometer pipe in a mode adopted by a conventional technical means, and rock movement parameters in the drill hole are collected through the inclinometer. In the embodiment, the steel strand is adopted to bind the inclinometer pipe and the grouting pipe, so that the stress of the steel bar in the drill hole can be measured by adopting an anchor cable (rod) stress meter, and the temperature of the embedded point can be synchronously measured. During construction, prestress is applied to the steel strand at first, and then an anchor cable stress meter is installed
And when the buoyancy is too large in the natural downward process in the S4, filling clear water into the grouting pipe or using a drilling machine for assistance.
The grouting height in the S5 is 5% -15% of the hole depth.
In this embodiment, the preferred slip height is 10% of the hole depth.
Carrying out rust prevention treatment on the osmometer, carrying out soaking in water to enable the osmometer to reach a saturated state, and packaging the osmometer on a measuring head by utilizing non-woven geotextile; and before the inclinometer is placed, the inclinometer is tested and placed by using the analog inclinometer.
When the three-pipe group is adopted in the S3, prestress is applied to the steel strand before the anchor cable stress meter is installed; after completion of S7, the borehole is backfilled. The prestress is converted to a value of 0 to 294000N in average tension.
The prestress is not too large in the application process, so that the normal work of the inclinometer pipe or the osmosizing pipe is prevented from being influenced if the steel strand is applied with the increased prestress under the condition of straightening the steel strand. The prestress applied is therefore not more than 294000N, i.e. 30 tons. In the force application range of 0-294000N, the stress of the steel strand is adjusted by adjusting the tension according to the data feedback of the anchor cable stress gauge, so that the sensor element is prevented from being extruded due to overlarge stress. If the applied tension exceeds 30 tons, the steel strand would crush the sensing element directly without adjustment space.
The device comprises a drilling machine for drilling and a grouting pipe 1 for grouting the drilled hole, wherein a monitoring pipe group is arranged adjacent to the grouting pipe 2; a monitoring element is arranged in the monitoring pipe group; the monitoring element is connected with a back-end system through a communication cable.
Further, the monitoring tube group comprises an inclinometer tube 2; the outer sides of the grouting pipe 1 and the monitoring pipe group are coated with steel stranded wires 3; the monitoring elements include an inclinometer 4 and an osmometer 5.
Further, the osmometer 5 is positioned at the bottom of the borehole; the inclinometer is positioned in the inclinometer pipe; the bottom of the steel strand is provided with an anchor cable stress meter, or the bottom of the inclinometer pipe is provided with a steel bar stress meter.
Furthermore, the inclinometer pipes 2 are connected through an inclinometer pipe connecting joint; the aperture of the drill hole is 90-146 mm; the outer diameter of the steel strand is 15-16 mm; the outer diameter of the inclinometer pipe is 65-75 mm; the monitoring element is a pair of stress boxes; the two stress boxes are symmetrically arranged on two sides of the inclinometer pipe through the fixing supports and used for monitoring the axial stress of the inclinometer pipe.
The monitoring element is a stress box; the stress box is arranged at the bottom of the steel strand. The pressure transmission mode of the conventional pressure gauge is basically the same, and when the pressure gauge is embedded, special attention should be paid to the fact that the pressure receiving plate is completely contacted and tightly attached with a medium. The stress meter usually measures pressure in a vertical direction, so the stress meter is generally installed in a horizontal direction, but the pressure in a direction opposite to the stress surface of the stress meter can also be measured by changing the installation direction. In the embodiment, the stress boxes are symmetrically arranged on two sides of the pipe of the inclinometer, the axial stress of the inclinometer is monitored, and the stress boxes are arranged through the bracket in order to avoid the situation that the stress boxes and the inclinometer are extruded due to stress change and are cracked.
In this embodiment, the bore diameter is preferably 146mm because the inclinometer, the grouting pipe and the steel strand need to be constrained, and the inclinometer has a relatively large outer diameter because the inclinometer guide wheel is provided with a guide groove inside, and the bore diameter is preferably 146 mm.
The diameter D of the steel strand is preferably 9.5mm, 12.5mm or 15.2 mm.
Example two
Referring to fig. 2 and 4, the arrangement method of the multi-parameter monitoring sensors for the overburden layer of the coal mining subsidence area comprises a grouting pipe, an inclinometer pipe and a seepage pipe, and comprises the following steps:
s1; performing hole positioning and measuring point placement, drilling the overburden rock in the subsidence area by using a drilling machine, and arranging a construction grout stopping wall at a drilling hole opening;
s2, binding the steel strand, the grouting pipe and the pressure measuring (seepage) pipe through a fixing device from outside to inside to form a three-pipe group;
s3, when the three-tube group in S2 is adopted, an anchoring section is connected to the bottom of the steel strand to serve as a stress monitoring front end; when the two pipe groups are adopted, the steel bar stress meter is arranged at the bottom end of the inclinometer pipe through the thin turns of wires, so that the steel bar stress meter is arranged in parallel to the stress direction of the inclinometer pipe structure;
s4, after the installation of S1-S3 is finished, naturally lowering the three tube groups to the bottom of the hole in the drill hole;
s5, grouting into the grouting pipe until reaching the designated elevation;
s6, after grouting is finished, carrying out no-load state measurement on the osmometer, and then hoisting to the designed installation height of the osmometer pipe;
and S7, connecting the cable of the sensing element with a power supply system and a back-end system.
And drilling a floral tube at the bottom of the infiltration pipe.
Specifically, the difference between the present embodiment and the first embodiment is that the inclinometer in the first embodiment is not constrained with the grouting pipe and the steel strand, in this case, the osmosizing machine does not need to be placed at the bottom of the hole, but can be prevented from being placed in the osmosizing pipe by the conventional technical means, but the present embodiment cannot utilize the inclinometer to measure the rock movement data in the hole.
And when the buoyancy is too large in the natural downward process in the S4, filling clear water into the grouting pipe or using a drilling machine for assistance.
The grouting height in the S5 is 5% -15% of the hole depth.
The preferred depth of the grouting is the same as in the first embodiment.
Furthermore, the osmometer is subjected to rust prevention treatment, immersed in water to reach a saturated state, and packaged on the measuring head by utilizing the non-woven geotextile.
Further, when the three-pipe group is adopted in S3, a prestress is applied to the steel strand before the anchor cable strain gauge is installed; after completion of S7, the borehole is backfilled.
The same as the first embodiment, the present embodiment still uses the steel strand to constrain the grouting pipe and the infiltration pipe, so the stress monitoring method in the first embodiment can still be used.
A multi-parameter monitoring sensor arrangement for overburden layers in a coal mining subsidence area comprises a coal electric drill for drilling and a grouting pipe for grouting the drilling, wherein a monitoring pipe group is arranged adjacent to the grouting pipe; a monitoring element is arranged in the monitoring pipe group; the monitoring element is connected with a back-end system through a communication cable.
Furthermore, the monitoring tube group comprises a seepage tube; the outer sides of the grouting pipe and the monitoring pipe group are coated with steel stranded wires; the monitoring element comprises an osmometer.
Further, the osmometer is positioned at the bottom of the drill hole; the bottom of the steel strand is provided with an anchor cable stress meter, or the bottom of the inclinometer pipe is provided with a steel bar stress meter.
Further, in this embodiment, the hole diameter of the drilling hole is preferably 95 mm; the outer diameter of the steel strand is 15.24 mm; the outer diameter of the osmotic pressure pipe is 53 mm.
EXAMPLE III
A multi-parameter monitoring sensor arrangement method for an overburden stratum in a coal mining subsidence area comprises a grouting pipe, an inclinometer pipe and a seepage pipe and comprises the following steps:
s1; drilling the overburden stratum in the subsidence area by using the coal electric drill;
s2, directly binding the inclinometer pipe and the grouting pipe through a fixing device to form two pipe groups;
s3, when the three-tube group in S2 is adopted, an anchoring section is connected to the bottom of the steel strand to serve as a stress monitoring front end; when the two pipe groups are adopted, the steel bar stress meter is arranged at the bottom end of the inclinometer pipe through the thin turns of wires, so that the steel bar stress meter is arranged in parallel to the stress direction of the inclinometer pipe structure;
s4, after the installation of S1-S3 is completed, naturally lowering the two pipe sets to the bottom of the hole in the drill hole;
s5, grouting into the grouting pipe until reaching the designated elevation;
s6, when grouting is finished, when an inclinometer pipe three-pipe group is adopted in S2, the inclinometer and the osmometer are checked and corrected, then the osmometer is installed at the bottom of the hole, and then the inclinometer is placed in the inclinometer pipe to enable the guide wheel to completely enter the guide groove; when the osmometer three-tube group is adopted in S2, after the no-load state measurement value is carried out on the osmometer, the osmometer is hoisted to the designed installation elevation of the osmometer;
and S7, connecting the cable of the sensing element with a power supply system and a back-end system.
And a floral tube is drilled at the bottom of the inclinometer pipe.
And when the buoyancy is too large in the natural downward process in the S4, filling clear water into the grouting pipe or using a drilling machine for assistance.
The grouting height in the S5 is 5% -15% of the hole depth.
Carrying out rust prevention treatment on the osmometer, carrying out soaking in water to enable the osmometer to reach a saturated state, and packaging the osmometer on a measuring head by utilizing non-woven geotextile; and before the inclinometer is placed, the inclinometer is tested and placed by using the analog inclinometer.
When the three-pipe group is adopted in the S3, prestress is applied to the steel strand before the anchor cable stress meter is installed; after completion of S7, the borehole is backfilled.
The utility model provides a coal mining subsidence district overburden multi-parameter monitoring sensor arranges, includes the coal electric drill that is used for carrying out the drilling to and be used for carrying out the slip casting pipe of slip casting to the drilling, its characterized in that: a monitoring pipe group is arranged adjacent to the grouting pipe; a monitoring element is arranged in the monitoring pipe group; the monitoring element is connected with a back-end system through a communication cable.
Furthermore, the monitoring tube group comprises a seepage tube and/or a gradient tube; the outer sides of the grouting pipe and the monitoring pipe group are coated with steel stranded wires; the monitoring element comprises an inclinometer or an osmometer.
Further, the osmometer is positioned at the bottom of the drill hole; the inclinometer is positioned in the inclinometer pipe; and a steel bar stress meter is arranged at the bottommost end of the inclinometer pipe.
Furthermore, the inclinometer pipes are connected through an inclinometer pipe connecting joint; the aperture of the drill hole is 146 mm; the outer diameter of the inclinometer pipe is 70 mm.
In this embodiment, the difference from the first and second embodiments is that the grouting pipe and the inclinometer pipe are not bound by a steel strand, but are directly bound by a fixing device. And a steel bar stress meter is arranged at the bottommost end of the inclinometer. In this embodiment, the steel bar stress meter used is a vibrating wire type steel bar stress meter. And after the mounting point is selected, the vibrating wire strain gauge is mounted in a direction parallel to the stress direction of the structure. And binding the strain gauge on the structural steel bar by adopting a fine turn wire. The test lead is led out along the structural steel bar and bound well. The strain gauge and the test lead are bound on the side surface of the bottom end of the structural steel bar so as to prevent the strain gauge from changing direction or damaging the strain gauge and the lead during vibration conduction.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (4)
1. The utility model provides a coal mining subsidence district overburden multi-parameter monitoring sensor arrangement structure, is including the coal electric drill that is used for carrying out the drilling to and be used for carrying out the slip casting pipe of slip casting to the drilling, its characterized in that: a monitoring pipe group is arranged adjacent to the grouting pipe; a monitoring element is arranged in the monitoring pipe group; the monitoring element is connected with a back-end system through a communication cable.
2. The coal mining subsidence area overburden multiparameter monitoring sensor arrangement of claim 1, wherein: the monitoring pipe group comprises a seepage pipe and/or an inclinometer pipe and/or a sedimentation pipe; the outer sides of the grouting pipe and the monitoring pipe group are coated with steel stranded wires; the monitoring elements comprise related inclination angle, displacement, hydrology and stress sensors such as an inclinometer and/or an osmometer and/or an anchor cable stress meter and/or a steel bar stress meter.
3. The coal mining subsidence area overburden multiparameter monitoring sensor arrangement of claim 2, wherein: the osmometer is positioned in the inclinometer pipe or the designed depth in the osmometer pipe; the inclinometer is positioned in the inclinometer pipe; an anchor cable stress meter is arranged at the bottom of the steel strand, or a steel bar stress meter is arranged at the bottommost end of the inclinometer pipe; and a settlement magnetic ring is arranged on the outer side of the inclinometer pipe.
4. The coal mining subsidence area overburden multiparameter monitoring sensor arrangement of claim 3, wherein: the inclinometer pipes are connected through an inclinometer pipe connecting joint; the aperture of the drill hole is 80-225 mm; the outer diameter of the steel strand is 3-17 mm; the outer diameter of the osmotic pressure pipe is 48-75 mm; the outer diameter of the inclinometer pipe is 50-95 mm; the back-end system comprises a power supply system, a data communication system and a lightning protection and anti-theft system; the monitoring element is a pair of stress boxes; the two stress boxes are symmetrically arranged on two sides of the inclinometer pipe through the fixing supports and used for monitoring the axial stress of the inclinometer pipe.
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| CN112983549A (en) * | 2021-03-09 | 2021-06-18 | 中国矿业大学 | Overburden mining abscission layer dynamic development monitoring method |
| CN112983549B (en) * | 2021-03-09 | 2021-10-26 | 中国矿业大学 | Overburden mining abscission layer dynamic development monitoring method |
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