Fiber bragg grating dam monitoring device

Abstract

The utility model relates to a fiber bragg grating dam monitoring device, and relates to the field of dam monitoring technology, the fiber bragg grating dam monitoring device comprises a string type fiber bragg grating sensor and a positioning steel bar, the positioning steel bar is formed by fixedly connecting a plurality of steel bar sections end to end, and fixing mechanisms are fixedly installed at the same positions of the steel bar sections respectively; the distance between any two adjacent fixing mechanisms is the same; the string-type fiber grating sensor comprises a plurality of sub-fiber grating sensors which are arranged in series, and the sub-fiber grating sensors are detachably installed on the fixing mechanism. According to the invention, the convenience of installing the string type fiber grating sensor by an operator can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of dam monitoring technologies, and particularly to a fiber Bragg grating dam monitoring device. Background Art

[0002] In the prior art, a dam monitoring system is often used to monitor the dam body of a dam. A common dam monitoring system mainly includes a string-type fiber Bragg grating sensor, a fiber Bragg grating demodulator, and a control host. The fiber Bragg grating sensor is embedded in the dam body of the dam. The input end of the string-type fiber Bragg grating sensor is connected to a laser light source through an optical fiber cable, and the output end of the string-type fiber Bragg grating sensor is connected to the fiber Bragg grating demodulator through an optical fiber cable. The fiber Bragg grating demodulator is electrically connected to the control host. Relevant personnel can grasp the displacement and settlement conditions of the dam body of the dam in real time through the control host.

[0003] Among them, the string-type fiber Bragg grating sensor is usually embedded inside the dam body during the construction of the dam. When building the dam, on-site operators reserve installation grooves on the dam body according to the layout and orientation of the string-type fiber Bragg grating sensor. Subsequently, the operators place a steel cage formed by bundling steel bars in the installation groove, and positioning steel bars for fixing the string-type fiber Bragg grating sensor are fixed inside the steel cage through cable ties.

[0004] Refer to Figure 1 , in the prior art, installation parts 200 are provided at both ends of a common sub-fiber Bragg grating sensor 100, and support parts 300 are integrally formed on the installation parts 200 respectively. During the installation process of the string-type fiber Bragg grating sensor, the operators fix the installation parts 200 at both ends of the string-type fiber Bragg grating sensor to the positioning steel bars 400 through cable ties 500, so that the support parts 300 are in contact with the positioning steel bars 400. At the same time, it is necessary to keep a set distance between the sub-fiber Bragg grating sensors 100 on the string-type fiber Bragg grating sensor, and it is also necessary to ensure that the optical fiber cables between the sub-fiber Bragg grating sensors 100 maintain a certain degree of slack. After the installation of the string-type fiber Bragg grating sensor is completed, the operators pour concrete 600 into the installation groove and process the concrete 600 with a vibrating rod.

[0005] However, at the site of installing the string-type fiber Bragg grating sensor, it is often necessary for the operators to continuously measure during the installation process to determine the installation position of the sub-fiber Bragg grating sensor 100, and then fix the sub-fiber Bragg grating sensor 100 through the cable tie 500. The installation process is relatively cumbersome and there is room for improvement. Utility Model Content

[0006] In order to improve the convenience of the operators in installing the string-type fiber Bragg grating sensor, the present application provides a fiber Bragg grating dam monitoring device.

[0007] The fiber Bragg grating dam monitoring device provided by the present application adopts the following technical solutions:

[0008] An optical fiber grating dam monitoring device includes a string-type optical fiber grating sensor and positioning steel bars. The positioning steel bars are formed by fixedly connecting a plurality of steel bar segments end to end. Fixed mechanisms are respectively and fixedly installed at the same positions on the steel bar segments, and the distance between any two adjacent fixed mechanisms is the same;

[0009] The string-type optical fiber grating sensor includes a plurality of sub-optical fiber grating sensors arranged in series, and the sub-optical fiber grating sensors are respectively detachably installed on the fixed mechanisms.

[0010] By adopting the above technical solution, when installing the string-type optical fiber grating sensor, the operator can first fixedly connect the steel bar segments end to end in the steel cage in the installation groove, and then the operator can fix the sub-optical fiber grating sensors on the string-type optical fiber grating sensor to the steel bar segments through the fixed mechanisms on the steel bar segments. Since the distance between the fixed mechanisms is the same, during the installation process, the operator does not need to measure and determine the installation position of the sub-optical fiber grating sensor at the same time, which can effectively improve the convenience and efficiency of the operator in installing the string-type optical fiber grating sensor.

[0011] Preferably, the fixed mechanism includes two mounting seats, and grooves adapted to the mounting parts at both ends of the sub-optical fiber grating sensor are respectively formed on the two mounting seats;

[0012] Hooping members are respectively arranged on the mounting seats. One end of the hooping member is hinged to the mounting seat, and the other end of the hooping member is detachably connected to the mounting seat, and the mounting part is located between the hooping member and the mounting seat.

[0013] By adopting the above technical solution, during the actual installation process, the operator can quickly determine the position of the sub-optical fiber grating sensor on the steel bar segment through the mounting parts at both ends of the sub-optical fiber grating sensor, and fix the sub-optical fiber grating sensor through the hooping member, which is more convenient than the method of fixing the sub-optical fiber grating sensor by cable ties.

[0014] Preferably, two positioning parts are fixedly connected to the mounting seat, and positioning grooves adapted to the supporting parts on the sub-optical fiber grating sensor are respectively formed on the positioning parts.

[0015] By adopting the above technical solution, the positioning parts can limit the position of the supporting parts on the mounting parts of the sub-optical fiber grating sensor, and the inner wall of the positioning groove can reduce the occurrence of the left and right offset of the supporting parts, which can effectively improve the stability of the installation of the sub-optical fiber grating sensor.

[0016] Preferably, elastic rubber cushions are respectively and fixedly installed on the inner walls of the grooves and the inner side walls of the hooping members.

[0017] By adopting the above technical solution, the elastic rubber cushion layer is tightly pressed between the two sides of the installation part and the hoop and the groove, which can further improve the installation stability of the sub-fiber Bragg grating sensor.

[0018] Preferably, connecting pipe fittings are respectively arranged between any two adjacent reinforcing bar segments, and slots for the ends of the reinforcing bar segments to extend into are respectively opened at both ends of the connecting pipe fittings.

[0019] First installation holes for the bolt rod parts to extend into are respectively penetrated and opened at both ends of the reinforcing bar segments, second installation holes are respectively penetrated and opened at both ends of the connecting pipe fittings, and the second installation holes are coaxial with the first installation holes.

[0020] By adopting the above technical solution, since the positioning reinforcing bar is formed by connecting a plurality of reinforcing bar segments end to end through connecting pipe fittings, the reinforcing bar segments can be stacked and transported during transportation, which can effectively improve the transportation convenience. Through the second installation holes on the connecting pipe fittings and the first installation holes at the ends of the reinforcing bar segments, it is convenient for the operator to fix the connecting pipe fittings and the reinforcing bar segments with bolts.

[0021] Preferably, a wire fixing buckle for fixing the optical cable of the string type fiber Bragg grating is fixedly installed on the side wall of the connecting pipe fitting.

[0022] By adopting the above technical solution, the wire fixing buckle can fix the optical cable of the string type fiber Bragg grating sensor and can form a support for the optical cable of the string type fiber Bragg grating sensor.

[0023] In summary, the fiber Bragg grating dam monitoring device of the present application has at least one of the following beneficial technical effects:

[0024] 1. When installing the string type fiber Bragg grating sensor, the operator can first connect the reinforcing bar segments end to end and fix them in the steel cage in the installation groove, and then the operator can fix the sub-fiber Bragg grating sensor on the string type fiber Bragg grating sensor on the reinforcing bar segment through the fixing mechanism on the reinforcing bar segment. Since the distance between the fixing mechanisms is the same, during the installation process, the operator does not need to measure and determine the installation position of the sub-fiber Bragg grating sensor at the same time, which can effectively improve the convenience and efficiency of the operator in installing the string type fiber Bragg grating sensor.

[0025] 2. The positioning part can limit the position of the supporting part on the installation part of the sub-fiber Bragg grating sensor, and the inner wall of the positioning groove can reduce the occurrence of the supporting part shifting left and right, which can effectively improve the installation stability of the sub-fiber Bragg grating sensor. Description of the Drawings

[0026] Figure 1 It is a schematic diagram for the present application to show the common positioning method of the sub-fiber Bragg grating sensor in the prior art.

[0027] Figure 2It is a schematic diagram showing the overall structure of the fixing mechanism in an embodiment of the present application.

[0028] Figure 3 It is a schematic diagram showing the overall structure of the mounting base in an embodiment of the present application.

[0029] Figure 4 It is a schematic diagram showing the overall structure of the connecting pipe fitting in an embodiment of the present application

[0030] Explanation of reference numerals: 100, sub-fiber Bragg grating sensor; 200, mounting part; 300, supporting part; 400, positioning steel bar; 500, cable tie; 600, concrete; 1, steel bar section; 11, first mounting hole; 2, fixing mechanism; 21, mounting base; 22, groove; 23, hoop; 24, positioning part; 25, positioning groove; 3, connecting pipe fitting; 31, slot; 32, second mounting hole; 33, wire fixing buckle; 4, steel cage. Detailed implementation manners

[0031] The following further elaborates on the present application in conjunction with the attached Figures 2-4 drawings.

[0032] Embodiment

[0033] An embodiment of the present application discloses an optical fiber grating dam monitoring device. Referring to Figures 2-4 , it includes a string-type fiber Bragg grating sensor and a positioning steel bar 400. The positioning steel bar 400 is formed by fixing a plurality of steel bar sections 1 to each other end to end. Fixing mechanisms 2 are respectively and fixedly installed at the same positions on the steel bar sections 1, and the distances between any two adjacent fixing mechanisms 2 are the same; the string-type fiber Bragg grating sensor includes a plurality of sub-fiber Bragg grating sensors 100 arranged in series, and the sub-fiber Bragg grating sensors 100 are respectively detachably installed on the fixing mechanisms 2.

[0034] When installing the string-type fiber Bragg grating sensor, an operator can first fix the steel bar sections 1 end to end in the steel cage 4 in the installation groove, and then the operator can fix the sub-fiber Bragg grating sensors 100 on the string-type fiber Bragg grating sensor to the steel bar sections 1 through the fixing mechanisms 2 on the steel bar sections 1. Since the distances between the fixing mechanisms 2 are the same, during the installation process, the operator does not need to measure and determine the installation positions of the sub-fiber Bragg grating sensors 100 at the same time, which can effectively improve the convenience and efficiency of the operator in installing the string-type fiber Bragg grating sensor.

[0035] Referring to Figure 2 and Figure 3, the fixing mechanism 2 includes two mounting seats 21, and grooves 22 adapted to the mounting portions 200 at both ends of the sub-fiber Bragg grating sensor 100 are respectively formed on the two mounting seats 21; hoop fasteners 23 are respectively arranged on the mounting seats 21, one end of the hoop fastener 23 is hinged to the mounting seat 21, the other end of the hoop fastener 23 is detachably connected to the mounting seat 21, and the mounting portion 200 is located between the hoop fastener 23 and the mounting seat 21.

[0036] During the actual installation process, the operator can quickly determine the position of the sub-fiber Bragg grating sensor 100 on the steel bar section 1 through the mounting portions 200 at both ends of the sub-fiber Bragg grating sensor 100, and fix the sub-fiber Bragg grating sensor 100 through the hoop fastener 23, which is more convenient compared to the method of fixing the sub-fiber Bragg grating sensor 100 with a cable tie 500.

[0037] Refer to Figure 3 , two positioning portions 24 are fixedly connected to the mounting seat 21, and positioning grooves 25 adapted to the supporting portions 300 on the sub-fiber Bragg grating sensor 100 are respectively formed on the positioning portions 24. The positioning portions 24 can limit the position of the supporting portions 300 on the mounting portion 200 of the sub-fiber Bragg grating sensor 100, and the inner wall of the positioning groove 25 can reduce the occurrence of left and right offsets of the supporting portions 300, effectively improving the installation stability of the sub-fiber Bragg grating sensor 100.

[0038] In the embodiment of the present application, elastic rubber cushions are respectively fixedly installed on the inner walls of the grooves 22 and the inner side walls of the hoop fasteners 23. The elastic rubber cushions are pressed against both sides of the mounting portion 200 between the hoop fastener 23 and the groove 22, further improving the installation stability of the sub-fiber Bragg grating sensor 100.

[0039] Refer to Figure 4 , connecting pipe fittings 3 are respectively arranged between any two adjacent steel bar sections 1, and insertion slots 31 for the ends of the steel bar sections 1 to extend into are respectively formed at both ends of the connecting pipe fittings 3; first installation holes 11 for the bolt rod portions to extend into are respectively formed through both ends of the steel bar section 1, and second installation holes 32 are respectively formed through both ends of the connecting pipe fitting 3, and the second installation holes 32 are coaxial with the first installation holes 11.

[0040] Since the positioning steel bar 400 is formed by connecting a plurality of steel bar sections 1 end to end through the connecting pipe fittings 3, the steel bar sections 1 can be stacked and transported during transportation, effectively improving the transportation convenience. Through the second installation holes 32 on the connecting pipe fittings 3 and the first installation holes 11 at the ends of the steel bar sections 1, it is convenient for the operator to fix the connecting pipe fittings 3 and the steel bar sections 1 with bolts.

[0041] Refer to Figure 4, a wire fixing buckle 33 for fixing the optical cable of the string type fiber grating is fixedly installed on the side wall of the connecting pipe fitting 3. The wire fixing buckle 33 can fix the optical cable of the string type fiber grating sensor, can support the optical cable of the string type fiber grating sensor, and reduce the occurrence of the situation that the displacement of the optical cable of the string type fiber grating sensor during the casting of concrete 600 after installation has an adverse effect on the sub-fiber grating sensor 100.

[0042] The implementation principle of an optical fiber grating dam monitoring device according to an embodiment of the present application is as follows: When installing the string type fiber grating sensor, an operator can first connect the reinforcing bar segments 1 end to end and fix them in the steel cage 4 in the installation groove. Subsequently, the operator can fix the sub-fiber grating sensor 100 on the string type fiber grating sensor to the reinforcing bar segment 1 through the fixing mechanism 2 on the reinforcing bar segment 1. Since the distances between the fixing mechanisms 2 are the same, during the installation process, the operator does not need to measure and determine the installation position of the sub-fiber grating sensor 100 at the same time, which can effectively improve the convenience and efficiency of the operator in installing the string type fiber grating sensor.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A fiber Bragg grating dam monitoring device, characterized in that: It comprises a series-type fiber optic grating sensor and a positioning steel bar (400), wherein the positioning steel bar (400) is formed by a plurality of steel bar segments (1) being fixedly connected end to end, and fixing mechanisms (2) are respectively fixedly installed at the same positions on the steel bar segments (1), and the spacing between any two adjacent fixing mechanisms (2) is the same; The serial fiber grating sensor comprises a plurality of sub-fiber grating sensors (100) arranged in series, and the sub-fiber grating sensors (100) are respectively detachably mounted on the fixing mechanism (2).

2. A fiber Bragg grating dam monitoring device according to claim 1, characterized in that: The fixing mechanism (2) comprises two mounting seats (21), and the two mounting seats (21) are respectively provided with grooves (22) adapted to the mounting parts (200) at both ends of the sub-fiber grating sensor (100); A hoop (23) is provided on each of the mounting seats (21), one end of the hoop (23) is hinged to the mounting seat (21), the other end of the hoop (23) is detachably connected to the mounting seat (21), and the mounting portion (200) is located between the hoop (23) and the mounting seat (21).

3. A fiber Bragg grating dam monitoring device according to claim 2, characterized in that: Two positioning parts (24) are fixedly connected to the mounting seat (21), and the positioning parts (24) are respectively provided with positioning grooves (25) adapted to the supporting parts (300) on the sub-fiber grating sensor (100).

4. A fiber Bragg grating dam monitoring device according to claim 3, characterized in that: An elastic rubber cushion layer is fixedly mounted on the inner wall of the groove (22) and the inner side wall of the clamp (23).

5. A fiber Bragg grating dam monitoring device according to claim 4, characterized in that: A connecting pipe (3) is provided between any two adjacent steel bar segments (1), and slots (31) for the ends of the steel bar segments (1) to extend into are respectively provided at both ends of the connecting pipe (3); The two ends of the steel bar segment (1) are respectively penetrated with a first mounting hole (11) for the bolt rod to extend into, and the two ends of the connecting pipe (3) are respectively penetrated with a second mounting hole (32), and the second mounting hole (32) is coaxial with the first mounting hole (11).

6. A fiber Bragg grating dam monitoring device according to claim 5, characterized in that: A line fixing buckle (33) for fixing the optical cable of the string-type optical fiber grating is fixedly mounted on the side wall of the connecting pipe (3).

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