CN111006605B - Pre-buried type filling body transverse deformation measuring device based on fiber grating sensing - Google Patents
Pre-buried type filling body transverse deformation measuring device based on fiber grating sensing Download PDFInfo
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- CN111006605B CN111006605B CN201911402058.8A CN201911402058A CN111006605B CN 111006605 B CN111006605 B CN 111006605B CN 201911402058 A CN201911402058 A CN 201911402058A CN 111006605 B CN111006605 B CN 111006605B
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- transverse deformation
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
Abstract
The invention discloses a pre-buried type filling body transverse deformation measuring device based on fiber grating sensing, and belongs to the technical field of mine filling body monitoring. The device comprises a measurement main body, a steel pipe, an extension line and two fiber grating displacement sensors fixed in the measurement main body, wherein the measurement main body comprises a shell and an upper cover matched with the shell, the steel pipe is connected in the horizontal direction of the measurement main body, the outlets of the left side and the right side are provided with external threads at the part positioned outside the shell, the measurement main body and the steel pipe are connected together through the external threads and the internal threads, part of movable pull rods of the fiber grating displacement sensors are positioned in the steel pipe, the extension line is also arranged in the steel pipe, and the extension line is connected with the movable pull rods of the fiber grating displacement sensors. The measuring device can measure the left and right sides and the total transverse deformation of the filling body.
Description
Technical Field
The invention relates to the technical field of mine filling body monitoring, in particular to a pre-buried filling body transverse deformation measuring device based on fiber bragg grating sensing.
Background
The filling mining means that the goaf is filled with filling materials after underground coal resources are mined, the filling body effectively supports the overlying strata, the surface movement deformation value is controlled within the allowable deformation range of the building (structure), the safe recovery of the coal and carbon resources under the building (structure) is realized, and the ecological environment and the underground water resources of the mining area are protected at the same time. The filling mining is an important technical means for mining 'three lower' pressed coal in China, and the filling mining technology is more and more widely applied in China along with the continuous improvement of the environmental protection requirement of China in recent years.
After the filling exploitation, the filling body will be used as a bearing structure to support the overburden, and the actual working state of the filling body in the well will directly determine the magnitude of the surface movement deformation value, so that it is necessary to monitor the actual working state of the filling body in the well in real time. CN202467929U and CN103528731A disclose an on-line monitoring system for the performance of a filler and an on-line monitoring system for the filling of coal mine paste based on fiber bragg grating sensing, which monitor only the vertical deformation and stress of the filler, but cannot monitor the lateral deformation of the filler.
The transverse deformation of the filling body is an important index for evaluating the long-term stability of the filling body, so that the development of a transverse deformation measuring device of the filling body is necessary, and the transverse deformation measuring device has important significance for evaluating the underground actual working state and stability of the filling body.
Disclosure of Invention
The invention aims to provide a pre-buried type filling body transverse deformation measuring device based on fiber grating sensing, which can realize measurement of the left side and the right side of a filling body and the total transverse deformation.
The technical scheme is as follows:
a pre-buried type filling body transverse deformation measuring device based on fiber bragg grating sensing is buried in a filling body and used for measuring the left side, the right side and the total transverse deformation of the filling body;
the fiber grating sensing-based embedded type filling body transverse deformation measuring device comprises a measuring main body, an extension line, a steel pipe and two fiber grating displacement sensors fixed in the measuring main body, wherein the measuring main body comprises a shell and an upper cover matched with the shell, the shell is of a hollow cuboid structure, outlets are respectively arranged on the left side and the right side of the shell, movable pull rods of the two fiber grating displacement sensors respectively penetrate through the outlets on the left side and the right side, the movable pull rods of the fiber grating displacement sensors face the outlets on the left side and the right side of the shell, and the axes of the movable pull rods are overlapped with the axes of the corresponding outlets; two optical fiber leading-out holes are formed in the rear side of the shell, and optical fiber connectors of the two optical fiber grating displacement sensors are respectively led out from the corresponding optical fiber leading-out holes;
sealing plugs I used for preventing filling slurry or water from entering the shell are arranged between the optical fiber connectors of the two optical fiber grating displacement sensors and the shell;
the part of the outlets on the left side and the right side, which is positioned outside the shell, is provided with external threads, the steel pipe is provided with a plurality of sections, the steel pipe adjacent to the shell is just in rotary connection with the external threads, the rest steel pipes are sequentially connected through threads, part of movable pull rods of the fiber grating displacement sensor are positioned in the steel pipe, the steel pipe is internally provided with the extension line, and the extension line is connected with the movable pull rods of the fiber grating displacement sensor.
In a preferred embodiment of the present invention, a sealing ring for tightly connecting with the upper cover is disposed at an upper opening of the housing, the fiber grating displacement sensor is fixed in the housing by screws, and the housing and the upper cover are connected by bolts.
As another preferable aspect of the present invention, the outer surface of the extension line is coated with a lubricating oil for reducing resistance during the movement thereof.
Further, the extension line is a rigid member.
The installed extension line is in a pre-tightening state so as to ensure that the fiber bragg grating displacement sensor can be pulled to generate deformation immediately after the filling body drives the baffle to move.
Furthermore, the number of the pre-buried type filling body transverse deformation measuring devices based on the fiber bragg grating sensing is determined according to the measuring purpose, and the number is more than or equal to 1; the length of the extension line and the number of steel pipes are also determined according to the purpose of measurement.
Compared with the prior art, the invention has the following beneficial technical effects:
the pre-buried type filling body transverse deformation measuring device based on fiber bragg grating sensing is pre-buried, can realize measurement of the left side and the right side of the filling body in the whole process (from filling to final) and the total transverse deformation, and cannot be realized by other devices.
When the measuring device is used, power supply is not needed underground, and the device is intrinsically safe; by adopting all-optical measurement and optical fiber transmission, the influence of underground electromagnetic interference can be effectively avoided; temperature errors are compensated by adopting the temperature compensation grating, so that the monitoring precision is greatly improved.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural diagram of a pre-buried type filler transverse deformation measuring device based on fiber grating sensing, a computer system and the like for measuring the transverse deformation of the filler in a matching manner;
FIG. 2 is a schematic structural diagram of a pre-buried type filler transverse deformation measuring device based on fiber grating sensing according to the present invention;
FIG. 3 is a schematic diagram of the internal structure of the pre-buried type filler transverse deformation measuring device based on fiber grating sensing according to the present invention;
FIG. 4 is a schematic structural view of a fixing plate according to the present invention;
FIG. 5 is a schematic connection diagram of a measurement system for measuring by using the fiber grating sensing-based embedded filler transverse deformation measurement device of the present invention;
FIG. 6 is a block diagram of a measurement system for measuring the lateral deformation of an embedded filler based on fiber grating sensing according to the present invention.
Description of reference numerals: A. the device comprises a filling body, B, solid coal, 1, a pre-buried filling body transverse deformation measuring device based on fiber bragg grating sensing, 2, a steel pipe, 3, a fixed disc, 4, a coupler, 5, optical fibers, 6, a mining optical cable, 7, a fiber bragg grating demodulator, 8, a computer system, 9, an extension line, 11, a shell, 12, an upper cover, 13, a fastening bolt, 14, a fiber bragg grating displacement sensor, 15, a sealing ring, 16, a first sealing plug, 17, a left outlet, 18, a right outlet, 19, an optical fiber leading-out hole, 141, an optical fiber connector, 142, a movable pull rod, 31, a baffle disc, 32, a second sealing plug, 33 and a fastening ring.
Detailed Description
The invention provides a fiber grating sensing-based embedded type filling body transverse deformation measuring device, and in order to make the advantages and technical scheme of the invention clearer and clearer, the invention is described in detail below by combining specific embodiments.
Referring to fig. 2 to 5, the pre-buried type filler lateral deformation measuring device based on fiber grating sensing of the present invention is buried in a filler a, and two sides of the filler a are solid coal B for measuring the left and right sides of the filler a and the total lateral deformation.
As the main innovation point of the invention, the detail structure of the pre-embedded type filling body transverse deformation measuring device based on the fiber grating sensing is as follows:
the fiber grating sensing-based pre-buried filling body transverse deformation measuring device 1 comprises a measuring main body, a steel pipe, an extension line and two fiber grating displacement sensors 14 fixed in the measuring main body, wherein the measuring main body comprises a shell 11 and an upper cover 12 matched with the shell, the shell is of a hollow cuboid structure, a sealing ring 15 used for being tightly connected with the upper cover is arranged at an opening above the shell, the fiber grating displacement sensors are fixed in the shell 11 through screws, and the shell 11 is connected with the upper cover through fastening bolts 13.
Set up an export respectively in the left and right both sides of casing 11, be left export 17 and right export 18 respectively, the export of left and right both sides is passed respectively to two fiber grating displacement sensor's activity pull rod 142, and fiber grating displacement sensor's activity pull rod is towards the export of the casing left and right sides to the axis of activity pull rod overlaps with the axis that corresponds the export, and the aim at that sets up like this: the movable pull rod can keep a straight line in the movement process, and cannot be acted by lateral external force, so that the measurement precision is ensured.
Two optical fiber leading-out holes 19 are formed in the rear side of the shell, optical fiber connectors 141 of the two fiber grating displacement sensors are led out from the corresponding optical fiber leading-out holes respectively, and a sealing plug I16 is arranged between the optical fiber connectors and the shell to prevent filling slurry or water from entering the shell.
The export of left and right both sides is provided with the external screw thread in the part that is located the casing outside, steel pipe inside is provided with the internal thread that matches with the external screw thread, the steel pipe adjacent with the casing is swivelling joint just on the external screw thread through rotatory mode, in order to realize measuring the casing of main part and being connected of steel pipe, steel pipe 2 is provided with a plurality of sections, adjacent steel pipe passes through the screw thread and links to each other end to end each other, if the internal thread through one section steel pipe links to each other with the external screw thread cooperation of another section steel pipe, the quantity of steel pipe.
Part of the movable pull rod of the fiber grating displacement sensor is positioned in the steel pipe 2, an extension line 9 is also arranged in the steel pipe, and the extension line 9 is connected with the movable pull rod 142 of the fiber grating displacement sensor;
as shown in fig. 4, the fixed disk 3 for fixing the extension line includes a blocking disk 31, a second sealing plug 32 and a fastening ring 33, the blocking disk 31 is a disk/cross disk with a through hole in the middle, the blocking disk is fixedly connected with the second sealing plug 32, and the extension line passes through the second sealing plug and the through hole and then is connected with the blocking disk 31 through the fastening ring 33. The fixed disc fixes the extension line, and the extension line is prevented from moving along with the filling body in the deformation process of the filling body.
Furthermore, lubricating oil for reducing resistance in the movement process is coated on the outer surface of the extension line, the extension line is a rigid component and cannot generate elastic deformation, and the installed extension line is in a pre-tightening state so as to ensure that the fiber bragg grating displacement sensor can be pulled to generate deformation immediately after the filling body drives the baffle to move.
Furthermore, the number of the pre-buried type filling body transverse deformation measuring devices based on the fiber bragg grating sensing is determined according to the measuring purpose, and the number is more than or equal to 1; the length of the extension line and the number of steel pipes are also determined according to the purpose of measurement.
Furthermore, the communication substations can be arranged into a plurality of communication substations, and each communication substation is responsible for one filling working surface or one measuring area.
Further, the housing 11 and the upper cover 12 are preferably made of high-strength fine steel.
The present invention will be described in detail with reference to specific examples.
Example 1:
as shown in FIG. 1, the pre-buried type transverse deformation measuring device for the filling body based on fiber grating sensing is matched with a fixed disc 3, a coupler 4, an optical fiber 5, a mining optical cable 6, a fiber grating demodulator 7 and a computer system 8 for use, and a transverse deformation monitoring system for the filling body is formed together.
The fiber connector of the pre-buried type filling body transverse deformation measuring device based on fiber grating sensing is connected with the optical fiber through the coupler, and the optical fiber is connected with the mining optical cable through the coupler.
The mining optical cable is connected with the fiber bragg grating demodulator, demodulated signals are transmitted to the computer system, the computer system is provided with demodulation analysis configuration software, and the lateral deformation of the filling body is monitored in real time on line after the space is filled.
The number of the steel pipes is a plurality of, one end of each steel pipe is an internal thread, the other end of each steel pipe is an external thread, the steel pipes are connected end to end, and the number of the steel pipes is determined according to the measurement purpose.
The extension line is connected with a movable pull rod of a pre-buried type filling body transverse deformation measuring device based on fiber bragg grating sensing, the connected extension line and part of the movable pull rod penetrate through the inside of the steel pipe, and lubricating oil is coated on the outer side of the extension line and part of the movable pull rod to reduce resistance in the movement process;
the fixed disc for fixing the extension line comprises a blocking disc, a second sealing plug and a fastening ring, wherein the blocking disc is a disc or a cross disc with a through hole in the middle, the blocking disc is fixedly connected with the second sealing plug, and the extension line penetrates through the second sealing plug and the middle hole of the blocking disc and then is connected with the blocking disc through the fastening ring.
The extension line is a rigid component and cannot generate elastic deformation;
the length of the extension line is determined according to the measurement purpose;
the quantity of the pre-buried type filling body transverse deformation measuring devices based on fiber grating sensing is determined according to the measuring purpose, and each pre-buried type filling body transverse deformation measuring device based on fiber grating sensing is connected into the mining optical cable in a parallel connection mode through optical fibers.
Example 2:
referring to fig. 6, the installation and use method of the fiber grating sensing-based embedded filler transverse deformation measurement device, the coupler, the optical fiber, the mining optical cable, the fixed disc, the fiber grating demodulator and the computer system in embodiment 1 includes:
firstly, intercepting extension lines with proper lengths according to specific measurement purposes, selecting a certain number of steel pipes, connecting a shell with the steel pipes, the extension lines and a fixed disc, and installing a well-connected embedded type filling body transverse deformation measurement device based on fiber bragg grating sensing at a proper position;
secondly, connecting optical fiber connectors of the distributed pre-buried filling body transverse deformation measuring devices based on optical fiber grating sensing with optical fibers through couplers, connecting the optical fibers with a mining optical cable through the couplers, connecting the mining optical cable with an optical fiber grating demodulator, and connecting the optical fiber grating demodulator with a computer system;
the third step: and filling the goaf.
Parts not described in the above modes can be realized by adopting or referring to the prior art.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (5)
1. The utility model provides a pre-buried formula obturator transverse deformation measuring device based on fiber grating sensing which characterized in that: the device is embedded in a filling body and is used for measuring the left side and the right side of the filling body and the total transverse deformation;
the device for measuring the transverse deformation of the pre-buried filling body based on the fiber bragg grating sensing comprises a measuring main body, an extension line, a steel pipe and two fiber bragg grating displacement sensors fixed in the measuring main body, wherein the measuring main body comprises a shell and an upper cover matched with the shell, the shell is of a hollow cuboid structure, outlets are respectively arranged on the left side and the right side of the shell, movable pull rods of the two fiber bragg grating displacement sensors respectively penetrate through the outlets on the left side and the right side, the movable pull rod of the fiber bragg grating displacement sensor on the left side faces the outlet on the left side of the shell, the movable pull rod of the fiber bragg grating displacement sensor on the right side faces the outlet on the right side of the shell, and the axis of the movable pull rod is overlapped with the axis of the corresponding outlet; two optical fiber leading-out holes are formed in the rear side of the shell, and optical fiber connectors of the two optical fiber grating displacement sensors are respectively led out from the corresponding optical fiber leading-out holes;
sealing plugs I used for preventing filling slurry or water from entering the shell are arranged between the optical fiber connectors of the two optical fiber grating displacement sensors and the shell;
the part of the outlets on the left side and the right side, which is positioned outside the shell, is provided with external threads, the steel pipe is provided with a plurality of sections, the steel pipe adjacent to the shell is just in rotary connection with the external threads, the rest steel pipes are sequentially connected through threads, part of movable pull rods of the fiber grating displacement sensor are positioned in the steel pipe, the steel pipe is internally provided with the extension line, and the extension line is connected with the movable pull rods of the fiber grating displacement sensor.
2. The fiber grating sensing-based embedded filler transverse deformation measuring device according to claim 1, wherein: the fiber grating displacement sensor is characterized in that a sealing ring used for being tightly connected with the upper cover is arranged at an opening above the shell, the fiber grating displacement sensor is fixed in the shell through screws, and the shell is connected with the upper cover through bolts.
3. The fiber grating sensing-based embedded filler transverse deformation measuring device according to claim 1, wherein: the outer surface of the extension line is coated with lubricating oil for reducing resistance in the movement process of the extension line.
4. The fiber grating sensing-based embedded filler transverse deformation measuring device according to claim 1, wherein: the extension line is a rigid component.
5. The fiber grating sensing-based embedded filler transverse deformation measuring device according to claim 1, wherein: the quantity of the pre-buried type filling body transverse deformation measuring devices based on fiber bragg grating sensing is determined according to the measuring purpose, and the quantity is more than or equal to 1; the length of the extension line and the number of the steel pipes are also determined according to the measurement purpose.
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