Rock-soil body leakage detection device based on distributed optical fiber temperature measurement

Abstract

The invention discloses a distributed optical fiber temperature measurement rock-soil body leakage detection device, and relates to the technical field of rock-soil body leakage detection, and the device comprises a longitudinal steel bar, the longitudinal steel bar is connected with a transverse steel bar, one end of the longitudinal steel bar is sleeved with a second limiting retaining ring, and the two sides of a first connecting block are provided with clamping units. The two ends of the sensing optical cable are connected with an external optical fiber demodulator, and a heating wire in the sensing optical cable is connected with an external heating control module. Through the arrangement of the connection processing piece, when one end of the sensing optical cable penetrates through the second hanging ring, the sensing optical cable is pulled towards the first connection block, so that the second hanging ring is lifted by the pulling force of the sensing optical cable, and the sensing optical cable between the first connection block and the second hanging ring is prevented from irregular bending; therefore, the sensing optical cable is regularly laid on one side of the reinforcement cage according to an S shape, and the sensing optical cable is prevented from irregular bending to affect calculation of leakage points.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical leakage detection, and specifically to a geotechnical leakage detection device for distributed optical fiber temperature measurement. Background Art

[0002] The distributed optical fiber temperature measurement system (DTS), also known as optical fiber temperature measurement, realizes temperature monitoring based on the optical time domain reflectometry principle and the sensitivity of Raman scattering to temperature. Generally, when detecting the leakage of geotechnical bodies, a heating wire and an optical fiber need to be combined to form a sensing optical cable, and the leakage is detected by the temperature rise of the sensing optical cable. The leakage location can be quickly detected through the temperature distribution difference of the local geotechnical body in the leakage area.

[0003] However, since the sensing optical cable needs to be installed on the steel reinforcement cage during installation, the contact area between the sensing optical cable and the steel bar surface will be relatively large at this time, resulting in some heat being transferred to the steel bar surface when the sensing optical cable is operating, which will affect the detection accuracy. At the same time, the sensing optical cable cannot be neatly laid, resulting in multiple irregular bends in the optical cable when laying the optical cable. In this way, when the temperature around the optical cable at this location is abnormal, the leakage location cannot be accurately inferred. Summary of the Invention

[0004] The purpose of the present invention is to provide a geotechnical leakage detection device for distributed optical fiber temperature measurement to solve the problems of inability to neatly lay the sensing optical cable and low detection accuracy.

[0005] To achieve the above object, the present invention provides the following technical solution: A geotechnical leakage detection device for distributed optical fiber temperature measurement, including longitudinal steel bars, transverse steel bars are connected to the longitudinal steel bars. One end of the longitudinal steel bar is sleeved with a second limiting buckle ring, and a first connecting block is installed on the side of the second limiting buckle ring away from the longitudinal steel bar. The other end of the longitudinal steel bar is sleeved with a first limiting buckle ring, and a second connecting block is provided on the side of the first limiting buckle ring away from the longitudinal steel bar. A plurality of first hanging rings are installed at the bottom of the first connecting block, and the plurality of first hanging rings are arranged equidistantly along the horizontal central axis of the first connecting block. A connection processing part is provided on the second connecting block, and a second hanging ring is installed on the second connecting block through the connection processing part. A sensing optical cable is connected between the first connecting block and the second connecting block through the connection processing part. Positioning units are provided on both sides of the first connecting block. Both ends of the sensing optical cable are connected to an external optical fiber demodulator, and the heating wire inside the sensing optical cable is connected to an external heating control module.

[0006] As a further solution of the present invention: The connection processing member includes an extension bin installed on the side of the second connection block away from the second limit buckle. A locking slide plate is slidably connected inside the extension bin. The bottom of the second hanging ring is installed with a guide rod extending into the second connection block. The bottom end of the guide rod is provided with a partition plate located inside the second connection block. A return spring is provided on the top of the partition plate, which is located outside the guide rod and connected to the top of the inner wall of the second connection block. A positioning hole is provided on the locking slide plate, and a positioning bolt is installed on the top of the extension bin.

[0007] As a further solution of the present invention: Both sides of the extension bin are provided with openings that fit the locking slide plate, and the thickness of the partition plate is equal to the thickness of the locking slide plate.

[0008] As a further solution of the present invention: The maximum moving distance of the second hanging ring is equal to the thickness of the partition plate, and both sides of the partition plate are in contact with both sides of the inner wall of the second connection block.

[0009] As a further solution of the present invention: The clamping unit includes side plates installed on both sides of the first connection block. A positioning guide wheel is installed inside the side plates. One end of the side plate away from the first connection block is inserted with a plug board. One end of the plug board away from the side plate is installed with a movable frame. A movable guide wheel is arranged inside the movable frame. One side of the side plate close to the first connection block is provided with a rotating pin extending into the side plate. A threaded groove is provided on one side of the plug board, and one end of the rotating pin is provided with a threaded rod located inside the threaded groove.

[0010] As a further solution of the present invention: The maximum distance between the positioning guide wheel and the movable guide wheel is greater than the diameter of the sensing optical cable, and the minimum distance between the positioning guide wheel and the movable guide wheel is less than the diameter of the sensing optical cable.

[0011] As a further solution of the present invention: Heat insulation cotton is laid on the inner walls of both the first hanging ring and the second hanging ring.

[0012] As a further solution of the present invention: A through hole with the same diameter as the guide rod is provided on the top of the second connection block.

[0013] As a further solution of the present invention: The inner wall diameters of both the first hanging ring and the second hanging ring are greater than the outer wall diameter of the sensing optical cable, and arc chamfers are provided on both sides of the first hanging ring and the second hanging ring.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up a connection processing part, when one end of the sensing optical cable passes through the second hanging ring, pull the sensing optical cable in the direction of the first connection block, so that the second hanging ring is pulled by the sensing optical cable and rises, thereby preventing the sensing optical cable between the first connection block and the second hanging ring from bending irregularly. At the same time, the baffle plate is displaced from the extension bin as the guide rod moves upward. When all the second hanging rings on the second connection block move upward relative to the second connection block, one side of the locking slide plate will lose the block of the baffle plate. At this time, the locking slide plate can be completely inserted into the extension bin, and the connection between the locking slide plate and the extension bin is achieved by screwing the positioning bolt, so that the sensing optical cable is laid on one side of the steel reinforcement cage in an "S"-shaped rule, preventing the sensing optical cable from bending irregularly and affecting the calculation of leakage points. At the same time, the setting of the second limit buckle and the first limit buckle makes there be a gap between the sensing optical cable and the longitudinal steel bars and transverse steel bars, thereby preventing the temperature on the surface of the sensing optical cable from being transmitted to the longitudinal steel bars and transverse steel bars when the sensing optical cable is in direct contact with them, so as to improve the detection accuracy; 2. By setting up a clamping unit, pass one end of the sensing optical cable between the positioning guide wheel and the movable guide wheel, and then lay the sensing optical cable. After the sensing optical cable is laid in an "S" shape between the first connection block and the second connection block, turn the rotating pin, so that the threaded rod rotates with the rotating pin, and thus the insertion plate moves towards the positioning guide wheel under the action of the threaded rod and the thread groove. In this way, the movable guide wheel and the positioning guide wheel can clamp and limit the sensing optical cable, thereby preventing the laid sensing optical cable from bending irregularly when the sensing optical cable is electrically connected to components such as an optical fiber demodulator and a heating control module later, so as to ensure the stability of the sensing optical cable between the first connection block and the second connection block. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the whole invention; Figure 2 is a schematic connection diagram of the sensing optical cable and the first connection block of the invention; Figure 3 is of the present invention Figure 2 enlarged view at A; Figure 4 is a schematic structural diagram of the first connection block of the invention; Figure 5 is a schematic connection diagram of the movable frame and the side plate of the invention; Figure 6 is a schematic structural diagram of the second connection block of the invention; Figure 7 is a schematic connection diagram of the second connection block and the second hanging ring of the invention; Figure 8 is a schematic internal structure diagram of the second connection block of the invention.

[0016] In the figure: 1. longitudinal steel bars; 2. transverse steel bars; 3. sensing optical cable; 4. first connecting block; 5. first hanging ring; 6. second connecting block; 7. second hanging ring; 8. first limiting snap ring; 9. second limiting snap ring; 10. positioning guide wheel; 11. movable guide wheel; 12. movable frame; 13. insertion plate; 14. side plate; 15. rotating pin; 16. threaded rod; 17. threaded groove; 18. extension bin; 19. locking slide plate; 20. positioning hole; 21. positioning bolt; 22. return spring; 23. partition board; 24. guide rod. Specific embodiments

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", and "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The embodiments of the present invention will be described below according to the overall structure of the present invention.

[0019] Embodiment 1 Please refer to Figures 1 to 8, in the embodiment of the present invention, a geotechnical leakage detection device for distributed optical fiber temperature measurement includes longitudinal steel bars 1. Transverse steel bars 2 are connected to the longitudinal steel bars 1. A second limiting buckle 9 is sleeved on one end of the longitudinal steel bar 1. A first connecting block 4 is installed on the side of the second limiting buckle 9 away from the longitudinal steel bar 1. A first limiting buckle 8 is sleeved on the other end of the longitudinal steel bar 1. A second connecting block 6 is arranged on the side of the first limiting buckle 8 away from the longitudinal steel bar 1. A plurality of first hanging rings 5 are installed at the bottom of the first connecting block 4. The plurality of first hanging rings 5 are arranged equidistantly along the horizontal central axis of the first connecting block 4. A connection processing member is arranged on the second connecting block 6. A second hanging ring 7 is installed on the second connecting block 6 through the connection processing member. A sensing optical cable 3 is connected between the first connecting block 4 and the second connecting block 6 through the connection processing member. Clamping units are arranged on both sides of the first connecting block 4. Both ends of the sensing optical cable 3 are connected to an external optical fiber demodulator, and the heating wire inside the sensing optical cable 3 is connected to an external heating control module.

[0020] In this embodiment, a steel bar cage for installing the sensing optical cable 3 is formed by cross-binding the longitudinal steel bars 1 and the transverse steel bars 2. Then, the second limiting buckle 9 and the first limiting buckle 8 are respectively sleeved on both ends of one longitudinal steel bar 1, so that the first hanging rings 5 and the second hanging rings 7 face in opposite directions. Then, both the first connecting block 4 and the second connecting block 6 are bound to the steel bar cage composed of the longitudinal steel bars 1 and the transverse steel bars 2. Then, one end of the sensing optical cable 3 passes through a second hanging ring 7 on the second connecting block 6, and then passes through a first hanging ring 5 on the first connecting block 4. Repeat this process to lay the sensing optical cable 3 in an "S" shape on the steel bar cage composed of the longitudinal steel bars 1 and the transverse steel bars 2. During this process, the connection processing member operates to lay the sensing optical cable 3 regularly on the steel bar cage, so as to prevent the sensing optical cable 3 between the second connecting block 6 and the first connecting block 4 from bending irregularly. Then, the clamping unit is operated to position the sensing optical cable 3 extending from both sides of the first connecting block 4. Then, the sensing optical cable 3 is electrically connected to components such as an external optical fiber demodulator and a heating control module. Then, the steel bar cage with the sensing optical cable 3 is buried in the geotechnical block through concrete. Subsequently, the leakage condition of the geotechnical block between the first connecting block 4 and the second connecting block 6 is detected by intermittently heating the sensing optical cable 3. If there is no leakage, the temperatures of each point along the sensing optical cable 3 rise synchronously at this time. If there is leakage, at this time, due to the influence of the seepage water, the temperature of the sensing optical cable 3 at the relative position rises slowly during heating. Thus, the leakage point is accurately calculated according to the change in the temperature at the corresponding position of the sensing optical cable 3.

[0021] Embodiment 2 Please refer to Figure 2 , Figure 4 , Figure 6 , Figure 7 , Figure 8, the connection processing member includes an extension bin 18 installed on the side of the second connection block 6 away from the second limit buckle 9. A locking slide plate 19 is slidably connected inside the extension bin 18. A guide rod 24 extending into the second connection block 6 is installed at the bottom of the second hanging ring 7. A partition plate 23 located inside the second connection block 6 is provided at the bottom end of the guide rod 24. A return spring 22 located outside the guide rod 24 and connected to the top inner wall of the second connection block 6 is provided at the top of the partition plate 23. A positioning hole 20 is formed in the locking slide plate 19. A positioning bolt 21 is installed at the top of the extension bin 18; Openings that fit the locking slide plate 19 are provided on both sides of the extension bin 18. The thickness of the partition plate 23 is equal to the thickness of the locking slide plate 19. By setting this structure, when the partition plate 23 moves upward, the blocking effect on the locking slide plate 19 is lost, so that the locking slide plate 19 can pass through the extension bin 18 and insert into the second connection block 6, thereby realizing the blocking of the locking slide plate 19; The maximum moving distance of the second hanging ring 7 is equal to the thickness of the partition plate 23. The two sides of the partition plate 23 are in contact with the two inner walls of the second connection block 6. By setting this structure, when the locking slide plate 19 inserts into the second connection block 6, its top is in contact with the bottom of the partition plate 23, so as to limit the second hanging ring 7 and prevent the sensing optical cable 3 from continuously being subjected to the tensile force applied by the elastic restoring force of the return spring 22; The inner wall diameters of the first hanging ring 5 and the second hanging ring 7 are both larger than the outer wall diameter of the sensing optical cable 3. Arc chamfers are provided on both sides of the first hanging ring 5 and the second hanging ring 7. By setting this structure, the friction generated when the sensing optical cable 3 passes through the first hanging ring 5 and the second hanging ring 7 is reduced, thereby reducing the wear degree of the sensing optical cable 3.

[0022] In this embodiment, when one end of the sensing optical cable 3 passes through the second hanging loop 7, the sensing optical cable 3 is pulled towards the first connection block 4. When the sensing optical cable 3 between the first connection block 4 and the second hanging loop 7 is in a straight state, the sensing optical cable 3 is continuously pulled, so that the second hanging loop 7 is pulled by the sensing optical cable 3 to rise, thereby preventing the sensing optical cable 3 between the first connection block 4 and the second hanging loop 7 from being irregularly bent. Then, one end of the sensing optical cable 3 is passed through the first connection block 4 and the second hanging loop 7. By pulling one end of the sensing optical cable 3 multiple times, the second hanging loop 7 drives the guide rod 24 to rise, so that the return spring 22 contracts. At the same time, the partition plate 23 is displaced from the extension bin 18 as the guide rod 24 moves upward. When all the second hanging loops 7 on the second connection block 6 move upward relative to the second connection block 6, one side of the locking slide plate 19 will lose the block of the partition plate 23. At this time, the locking slide plate 19 can be completely inserted into the extension bin 18, so that the positioning hole 20 is aligned with the positioning bolt 21. Then, the locking slide plate 19 can be connected to the extension bin 18 by screwing the positioning bolt 21. If one of the second hanging loops 7 on the second connection block 6 does not move upward relative to the second connection block 6, the locking slide plate 19 cannot be completely inserted into the extension bin 18. At this time, it means that there is still a section of the sensing optical cable 3 between the second connection block 6 and the first connection block 4 that is not in a straight state. Then, the sensing optical cable 3 at this place can be adjusted, so that the sensing optical cable 3 is laid on one side of the steel reinforcement cage in an "S" - shaped rule, preventing the sensing optical cable 3 from being irregularly bent and affecting the calculation of the leakage point. At the same time, the setting of the second limit buckle 9 and the first limit buckle 8 makes there be a gap between the sensing optical cable 3 and the longitudinal steel bars 1 and the transverse steel bars 2, so as to prevent the temperature on the surface of the sensing optical cable 3 from being transmitted to the longitudinal steel bars 1 and the transverse steel bars 2, thereby improving the detection accuracy.

[0023] Embodiment 3 Please refer to with emphasis Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 The clamping unit includes side plates 14 installed on both sides of the first connection block 4. A positioning guide wheel 10 is installed inside the side plates 14. One end of the side plate 14 away from the first connection block 4 is inserted with a plug board 13. One end of the plug board 13 away from the side plate 14 is installed with a movable frame 12. A movable guide wheel 11 is arranged inside the movable frame 12. One side of the side plate 14 close to the first connection block 4 is provided with a rotating pin 15 extending into the side plate 14. A threaded groove 17 is opened on one side of the plug board 13. One end of the rotating pin 15 is provided with a threaded rod 16 located inside the threaded groove 17; The maximum distance between the positioning guide wheel 10 and the movable guide wheel 11 is greater than the diameter of the sensing optical cable 3, and the minimum distance between the positioning guide wheel 10 and the movable guide wheel 11 is less than the diameter of the sensing optical cable 3. By setting this structure, when one end of the sensing optical cable 3 passes through the first hanging ring 5 or the second hanging ring 7, the positioning guide wheel 10 guides the sensing optical cable 3 to prevent the sensing optical cable 3 from being worn; Heat insulation cotton is laid on the inner walls of both the first hanging ring 5 and the second hanging ring 7. By setting this structure, heat conduction at the positions where the sensing optical cable 3 contacts the first hanging ring 5 and the second hanging ring 7 is prevented, further improving the detection accuracy; A through hole with the same diameter as the guide rod 24 is provided at the top of the second connecting block 6. By setting this structure, a moving space is provided for the guide rod 24.

[0024] In this embodiment, one end of the sensing optical cable 3 is passed between the positioning guide wheel 10 and the movable guide wheel 11, and then the sensing optical cable 3 is laid. After the sensing optical cable 3 is laid in an "S" shape between the first connecting block 4 and the second connecting block 6, the rotary pin 15 is turned, so that the threaded rod 16 rotates with the rotary pin 15, and thus the insertion plate 13 moves towards the positioning guide wheel 10 under the action of the threaded rod 16 and the thread groove 17. In this way, the movable guide wheel 11 and the positioning guide wheel 10 can clamp and limit the sensing optical cable 3, preventing the laid sensing optical cable 3 from being irregularly bent when the sensing optical cable 3 is electrically connected to components such as an optical fiber demodulator and a heating control module subsequently, so as to ensure the stability of the sensing optical cable 3 between the first connecting block 4 and the second connecting block 6.

[0025] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. A geotechnical leakage detection device for distributed optical fiber temperature measurement, comprising longitudinal steel bars (1), characterized in that, The longitudinal steel bars (1) are connected with transverse steel bars (2). One end of the longitudinal steel bar (1) is sleeved with a second limit buckle (9). A first connection block (4) is installed on the side of the second limit buckle (9) away from the longitudinal steel bar (1). The other end of the longitudinal steel bar (1) is sleeved with a first limit buckle (8). A second connection block (6) is arranged on the side of the first limit buckle (8) away from the longitudinal steel bar (1). A plurality of first hanging rings (5) are installed at the bottom of the first connection block (4). The plurality of first hanging rings (5) are arranged at equal intervals along the transverse central axis of the first connection block (4). A connection processing member is arranged on the second connection block (6). A second hanging ring (7) is installed on the second connection block (6) through the connection processing member. A sensing optical cable (3) is connected between the first connection block (4) and the second connection block (6) through the connection processing member. Clamping units are arranged on both sides of the first connection block (4). Both ends of the sensing optical cable (3) are connected to an external optical fiber demodulator, and the heating wire inside the sensing optical cable (3) is connected to an external heating control module.

2. The rock and soil body leakage detection device for distributed optical fiber temperature measurement according to claim 1, characterized in that, The connection processing member includes an extension bin (18) installed on the side of the second connection block (6) away from the second limit buckle (9). A locking slide plate (19) is slidably connected to the inner side of the extension bin (18). A guide rod (24) extending to the inside of the second connection block (6) is installed at the bottom of the second hanging ring (7). A partition plate (23) located inside the second connection block (6) is arranged at the bottom end of the guide rod (24). A return spring (22) located outside the guide rod (24) and connected to the top of the inner wall of the second connection block (6) is arranged on the top of the partition plate (23). A clamping hole (20) is formed in the locking slide plate (19). A positioning bolt (21) is installed at the top of the extension bin (18).

3. The rock and soil body leakage detection device for distributed optical fiber temperature measurement according to claim 2, characterized in that, Openings that fit the locking slide plate (19) are arranged on both sides of the extension bin (18). The thickness of the partition plate (23) is equal to the thickness of the locking slide plate (19).

4. The device for detecting leakage of rock and soil mass by distributed optical fiber temperature measurement according to claim 2, characterized in that, The maximum moving distance of the second hanging ring (7) is equal to the thickness of the partition plate (23). Both sides of the partition plate (23) are in contact with both sides of the inner wall of the second connection block (6).

5. The device for detecting leakage of rock and soil mass by distributed optical fiber temperature measurement according to claim 2, characterized in that, The clamping unit includes side plates (14) installed on both sides of the first connection block (4). A positioning guide wheel (10) is installed on the inner side of the side plates (14). A plug board (13) is inserted into one end of the side plates (14) away from the first connection block (4). A movable frame (12) is installed at the end of the plug board (13) away from the side plates (14). A movable guide wheel (11) is arranged on the inner side of the movable frame (12). A rotating pin (15) extending to the inside of the side plates (14) is arranged on the side of the side plates (14) close to the first connection block (4). A threaded groove (17) is formed in one side of the plug board (13). A threaded rod (16) located inside the threaded groove (17) is arranged at one end of the rotating pin (15).

6. The device for detecting leakage of rock and soil mass by distributed optical fiber temperature measurement according to claim 5, characterized in that, The maximum distance between the positioning guide pulley (10) and the movable guide pulley (11) is greater than the diameter of the sensing optical cable (3), and the minimum distance between the positioning guide pulley (10) and the movable guide pulley (11) is less than the diameter of the sensing optical cable (3).

7. The device for detecting leakage of rock and soil mass by distributed optical fiber temperature measurement according to claim 5, characterized in that, Heat insulation cotton is laid on the inner walls of the first hanging ring (5) and the second hanging ring (7).

8. A geotechnical leakage detection device for distributed optical fiber temperature measurement according to claim 5, characterized in that, A through hole with the same diameter as the guide rod (24) is provided at the top of the second connecting block (6).

9. The device for detecting seepage of rock and soil mass by distributed optical fiber temperature measurement according to claim 5, wherein The inner wall diameters of the first hanging ring (5) and the second hanging ring (7) are both greater than the outer wall diameter of the sensing optical cable (3), and arc chamfers are provided on both sides of the first hanging ring (5) and the second hanging ring (7).

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