CN118603376A - A perimeter warning device for bridge stress monitoring based on grating optical fiber - Google Patents

Abstract

The invention discloses a perimeter warning device for bridge stress monitoring based on grating optical fibers, which belongs to the technical field of grating optical fibers and comprises the following components: the device comprises a plurality of stress meters, a plurality of fixed cables, a track, an adjustable movable base, a bolt dismounting assembly, an end dismounting assembly, a horizontal positioning camera and a height-adjustable positioning camera, wherein a bearing mechanism moves to the position of the stress meter to be dismounted, the position of the middle part is adjusted by means of the horizontal positioning camera, a driving mechanism and a base adjusting mechanism, the horizontal positioning camera is aligned with the center scale of the stress meter, the position of a lifting plate is adjusted by means of the height-adjustable positioning camera, the vertical positioning scale is aligned with the scale of the positioning plate, then the stress meter to be dismounted is supported by means of the bearing mechanism, the corresponding stress meter bolt is dismounted by means of the bolt dismounting assembly, and the connecting end head is dismounted under the action of the end dismounting mechanism and the lifting translation mechanism.

Description

A perimeter warning device for bridge stress monitoring based on grating optical fiber

Technical Field

The invention relates to the technical field of grating optical fibers, and in particular to a perimeter warning device for monitoring bridge stress based on grating optical fibers.

Background Art

During the use of the bridge, it is necessary to monitor the stress changes of the bridge and know the stress state of the bridge in advance to avoid possible safety accidents. That is, through the perimeter warning of the bridge stress, the stress changes of the bridge can be obtained and known in advance before the accident occurs so as to carry out early warning maintenance in time.

When monitoring bridge stress, grating fiber stress gauges are usually used. The grating fiber principle is used to achieve the purpose of monitoring. When using grating fiber for bridge stress monitoring, the grating fiber stress gauges need to be installed on the bridge. The specific number of installations is selected according to the size of the bridge. Then, they are connected to external acquisition equipment through optical cables, and the stress changes of the monitored bridge are obtained through the acquisition equipment. For large bridges, a large number of grating fiber stress monitoring devices need to be installed. Strain gauges are usually installed during the construction of the bridge. After the bridge is built, there are usually left at the bottom of both sides of the bridge for daily inspection. During routine inspections, workers walk on both sides of the bridge through the inspection channel to observe the status of the bridge. As the bridge is used, when some grating fiber stress monitoring devices fail, before replacement, even through the retained inspection channel, it is usually still necessary to build a work ladder or work frame. Workers use the work ladder or work frame to replace the failed grating fiber stress monitoring device. The larger the bridge and the more grating fiber stress monitoring devices there are, the more complicated and time-consuming the replacement will be. Therefore, there is an urgent need to design a perimeter warning device for bridge stress monitoring based on grating optical fiber.

Summary of the invention

The technical problem to be solved by the present invention is: without building an artificial ladder or artificial frame, the problematic grating fiber stress gauge can be replaced with the help of the remaining maintenance channel, and the position of the grating fiber stress gauge can be accurately found during replacement to ensure smooth replacement.

The technical solution adopted by the present invention to solve the technical problem is: a perimeter warning device for bridge stress monitoring based on grating optical fiber, including: a plurality of strain gauges, a plurality of fixed cables, a track, an adjustable mobile base, a bolt disassembly assembly component, an end disassembly assembly component, a horizontal positioning camera and a height-adjustable positioning camera;

A plurality of the strain gauges are installed on the bottom surface of the bridge along a linear layout through strain gauge bolts, the fixing cables are fixedly installed on the bottom surface of the bridge through cable clamps and are located on the extension line of the strain gauges, and the rails are installed on the bottom surface of the bridge and are located on both sides of the linear layout of the strain gauges;

The adjustable movable base includes a middle portion, side portions arranged symmetrically with respect to the middle portion, and a base adjustment mechanism for connecting the middle portion and the side portions, and the side portions are provided with a driving mechanism detachably connected to the track, and when the driving mechanism is installed on the track, the driving mechanism can drive the adjustable movable base to move along the track;

A stress gauge center scale is provided at the center position of the stress gauge;

The middle part is provided with a lifting mechanism, the lifting mechanism is drivingly connected with a lifting base plate, the lifting base plate is provided with a supporting mechanism for supporting and limiting the strain gauge, the horizontal positioning camera is provided on the supporting mechanism, the horizontal positioning camera lens is provided with a horizontal positioning scale corresponding to the center scale of the strain gauge, and the line connecting the center of the horizontal positioning scale and the center of the middle part is perpendicular to the horizontal plane;

The lifting base plate is provided with four angle-adjustable telescopic plates in a rectangular layout, the bolt disassembly assembly is provided on the angle-adjustable telescopic plates, and the bolt disassembly assembly is used to disassemble and assemble the stress gauge bolts;

The fixed cable is provided with a fixed end head, the strain gauge is provided with connecting cables on both sides, the ends of the connecting cables are provided with connecting end heads, the connecting end heads are detachably connected to the fixed end heads, the cable clamp is provided with a vertical positioning plate, and the vertical positioning plate is provided with a positioning plate scale;

The middle part is provided with two symmetrically arranged adjustable bases, the two adjustable bases are located on both sides of the lifting base plate, the end head disassembly assembly assembly comprises a lifting and translation mechanism, a lifting plate and an end head disassembly assembly mechanism, the lifting and translation mechanism is arranged on the adjustable base, the lifting and translation mechanism is drivingly connected with the lifting plate, the end head disassembly assembly mechanism is arranged on the lifting plate, and the height adjustable positioning camera lens is provided with a vertical positioning scale corresponding to the positioning plate scale;

The adjustable movable base is provided with a remote control processing center, and the remote control processing center is electrically connected to the base adjustment mechanism, the driving mechanism, the lifting mechanism, the horizontal positioning camera, the bolt disassembly assembly component, the lifting and translation mechanism, the end disassembly assembly mechanism and the height adjustable positioning camera respectively;

When the strain gauge needs to be disassembled, the angle-adjustable telescopic plate and the adjustable base are adjusted according to the specifications of the strain gauge to be disassembled, so that the position of the bolt disassembly and assembly assembly can correspond to the strain gauge bolt corresponding to the strain gauge to be disassembled, and the position of the disassembly and assembly mechanism can correspond to the connecting end head. The driving mechanism is installed on the track. Under the action of the driving mechanism, the supporting mechanism moves to the position of the stress gauge to be disassembled, and with the help of the horizontal positioning camera, the position of the middle part is adjusted in cooperation with the driving mechanism and the base adjustment mechanism, so that the horizontal positioning scale is aligned with the center scale of the strain gauge. With the help of the height-adjustable positioning camera, the position of the lifting plate is adjusted in cooperation with the lifting and translation mechanism, so that the vertical positioning scale is aligned with the positioning plate scale. Then, the strain gauge to be disassembled is supported by the supporting mechanism, the corresponding strain gauge bolt is disassembled with the help of the bolt disassembly and assembly assembly, and the connecting end head is disassembled under the action of the end disassembly and assembly mechanism and the lifting and translation mechanism.

As a preferred technical solution of the present invention, the base adjustment mechanism includes a base adjustment cylinder, which is arranged at both ends of the middle part, the output end of the base adjustment cylinder is connected to the side part, and the base adjustment cylinder is electrically connected to the remote control processing center.

As a preferred technical solution of the present invention, the driving mechanism includes a driving motor, which is arranged on the side portion, and the output end of the driving motor is connected to a driving gear. The track is a U-shaped structure with a side opening, and a rack is arranged at the bottom of the track. The driving gear can be inserted into the U-shaped structure with a side opening of the track and meshed with the rack, and the driving motor is electrically connected to the remote control processing center.

As a preferred technical solution of the present invention, the lifting mechanism includes a middle part lifting cylinder, which is arranged on the middle part, and the output end of the middle part lifting cylinder is connected to the lifting base plate. The supporting mechanism includes a supporting pressure sensor, a supporting plate and a supporting seat. The supporting pressure sensor is arranged on the lifting base plate, and the supporting plate is arranged at the sensing end of the supporting pressure sensor. The supporting seat is arranged on the supporting plate for supporting the stress gauge. The horizontal positioning camera is arranged on the supporting plate. The middle part lifting cylinder and the supporting pressure sensor are both electrically connected to the remote control processing center.

As a preferred technical solution of the present invention, the angle-adjustable telescopic plate includes a telescopic plate bolt, a rotating arm, a bearing plate and a rotating arm fastening bolt, the telescopic plate bolt passes through the rotating arm and is rotatably connected to the rotating arm, the telescopic plate bolt passes through the end of the rotating arm and is threadedly connected to the lifting base plate, the bearing plate is connected to a bearing insert plate, the bearing insert plate is inserted into the rotating arm and is slidably connected to the rotating arm, the rotating arm fastening bolt is threadedly connected to the rotating arm, and extends into the rotating arm to abut against the bearing insert plate.

As a preferred technical solution of the present invention, the bolt disassembly and assembly assembly includes a bolt disassembly and assembly lifting cylinder, which is arranged on a carrying plate, and the output end of the bolt disassembly and assembly lifting cylinder is connected to a bolt pressure sensor, and a bolt disassembly and assembly motor is arranged on the sensing end of the bolt pressure sensor, and the output end of the bolt disassembly and assembly motor is connected to a limited insertion seat, and a magnetic bolt socket head is detachably installed in the limited insertion seat, and the bolt disassembly and assembly lifting cylinder, the bolt pressure sensor and the bolt disassembly and assembly motor are all electrically connected to the remote control processing center.

As a preferred technical solution of the present invention, the adjustable base includes an adjustable base body, an adjustable base insertion plate and a base body fastening bolt, the adjustable base body is arranged on the middle part and located on both sides of the lifting base plate, the adjustable base insertion plate is inserted into the adjustable base body and is slidably connected to the adjustable base body, the base body fastening bolt is threadedly connected to the adjustable base body, and extends into the adjustable base body to abut against the adjustable base insertion plate.

As a preferred technical solution of the present invention, the lifting and translation mechanism includes an end lifting cylinder and a translation guide rail, the end lifting cylinder is arranged on the adjustable base insertion plate, the output end of the end lifting cylinder is installed with a translation linear motor, the translation guide rail is arranged on the bottom surface of the lifting plate, the translation linear motor is drive-connected to the translation guide rail, the translation linear motor and the translation guide rail are both electrically connected to the remote control processing center, the end disassembly and assembly mechanism includes an end disassembly and assembly motor, a side plate and an end clamping cylinder, the end disassembly and assembly motor is arranged on the lifting plate, the output end of the end disassembly and assembly motor is connected with an end disassembly and assembly gear, the side plate is arranged on the lifting plate and located on both sides of the end disassembly and assembly gear, the end clamping cylinder is arranged on the side plate, the output end of the end clamping cylinder is connected with an end clamping plate, a plurality of end clamping rollers are rotatably connected to the end clamping plate, and the end disassembly and assembly motor and the end clamping cylinder are both electrically connected to the remote control processing center.

As a preferred technical solution of the present invention, the fixed end head includes a fixed cable connector, which is arranged at the end of the fixed cable, a fixed cable core is arranged in the fixed cable connector and extends to the outside of the fixed cable connector, the connecting end head includes a bearing, a rotating ring, a connecting cable core and a rubber sleeve, the bearing is sleeved on the end of the connecting cable, the connecting cable core is located in the connecting cable and the end extends to the outside of the connecting cable, the rotating ring is sleeved on the outside of the bearing and is rotatably connected to the bearing, a gear ring is arranged on the outer periphery of the rotating ring, the gear ring can mesh with the end disassembly gear, the rotating ring can be threadedly connected to the fixed cable connector, the rubber sleeve is arranged on the connecting cable and sleeved on the outer periphery of the connecting cable core, and the area of the connecting cable core corresponds to the area of the fixed cable core.

As a preferred technical solution of the present invention, the height-adjustable positioning camera includes a vertical telescopic seat and a vertical positioning camera, the vertical telescopic seat is arranged on the bottom surface of the lifting plate, the vertical positioning camera is arranged on the vertical telescopic seat, the vertical positioning scale is arranged on the vertical positioning camera lens, and the vertical positioning camera is electrically connected to the remote control processing center.

The beneficial effects of the present invention are embodied in:

By setting up a horizontal positioning camera, the horizontal position of the middle part is adjusted through the driving mechanism and the base adjustment mechanism with reference to the horizontal positioning scale and the center scale of the strain gauge. By setting up a height-adjustable positioning camera, the vertical position of the lifting plate is adjusted through the lifting and translation mechanism with reference to the vertical positioning scale and the positioning plate scale, thereby ensuring the smooth progress of subsequent disassembly work.

By setting a lifting mechanism in conjunction with a supporting mechanism, the strain gauge can be supported, by setting an angle-adjustable telescopic plate in conjunction with a bolt disassembly assembly component, the strain gauge bolt can be disassembled or installed, by setting an adjustable base in conjunction with an end disassembly assembly component, the connecting end head can be disassembled or installed, the support of the strain gauge, the disassembly and assembly of the strain gauge bolts and the disassembly and assembly of the connecting end head, after the construction of the bridge, there is no need to build an artificial ladder or an artificial frame, and the problematic grating fiber stress gauge can be replaced with the help of the retained maintenance channel. At the same time, with the help of the horizontal positioning camera, the vertical positioning camera, the horizontal positioning scale, the stress gauge center scale, the positioning plate scale and the vertical positioning scale, the position of the grating fiber stress gauge can be accurately found during replacement to ensure smooth replacement.

Since the driving mechanism can be detachably installed on the track, it can be installed when needed and disassembled when not needed, thereby avoiding damage to components such as the driving mechanism and the adjustable movable base when they are always on the bottom surface of the bridge. At the same time, only a small number of driving mechanisms, adjustable movable bases and other components need to be prepared to cope with the disassembly and assembly of all stress gauges on the bridge, thereby reducing overall costs.

By setting a supporting pressure sensor, the stroke range of the middle lifting cylinder when driven upward can be determined with the help of pressure sensing. By setting a bolt pressure sensor, the stroke range of the bolt disassembly and assembly lifting cylinder when driven upward can be determined with the help of pressure sensing.

By adopting the magnetic bolt socket head, the strain gauge bolt can be magnetically attracted when the strain gauge bolt is disassembled and assembled, thereby preventing the strain gauge bolt from falling off during the disassembly and assembly process.

Since the magnetic bolt sleeve head and the limiting insert seat can be detachably installed, the corresponding magnetic bolt sleeve head can be selected according to the specific specifications of the strain gauge bolt.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a bottom view schematically showing the present invention as a whole;

FIG2 is a schematic front view of the adjustable movable base and other parts of the present invention;

FIG3 is a schematic top view of the adjustable movable base and other parts of the present invention;

FIG4 is a bottom view schematically showing the adjustable movable base and other parts of the present invention;

5 is a bottom view schematic diagram of the stress gauge and other parts of the present invention;

FIG6 is a schematic diagram of a track portion of the present invention;

7 is a schematic diagram of the connecting end head and the fixed end head of the present invention;

FIG8 is a schematic side view of the fixed end portion and other parts of the present invention;

FIG9 is a schematic diagram of a height-adjustable positioning camera portion of the present invention;

FIG10 is an enlarged schematic diagram of part A in FIG2 of the present invention;

FIG11 is an enlarged schematic diagram of part B in FIG2 of the present invention;

FIG12 is an enlarged schematic diagram of portion C in FIG2 of the present invention;

FIG13 is an enlarged schematic diagram of portion D in FIG3 of the present invention;

FIG14 is an enlarged schematic diagram of part E in FIG3 of the present invention;

FIG15 is an enlarged schematic diagram of part F in FIG6 of the present invention;

FIG16 is an enlarged schematic diagram of portion G in FIG2 of the present invention;

FIG. 17 is an enlarged schematic diagram of portion H in FIG. 2 of the present invention.

In the figure: 1. strain gauge; 101. center scale of strain gauge; 102. bolt of strain gauge; 2. connecting cable; 201. bearing; 202. connecting cable core; 203. rubber sleeve; 3. rotating ring; 301. gear ring; 4. fixed cable; 401. cable clamp; 402. fixed cable connector; 403. fixed cable core; 404. vertical positioning plate; 405. positioning plate scale; 5. track; 501. rack; 6. middle part; 7. base adjustment cylinder; 8. side part; 9. driving motor; 10. driving gear; 11. middle part lifting cylinder; 12. lifting base plate; 13. supporting pressure sensor; 14. supporting plate; 15. horizontal positioning camera; 1501. horizontal positioning scale; 16. telescopic plate bolt; 17. rotating arm; 1 701, rotating arm fastening bolts; 18, adjustable base body; 1801, base body fastening bolts; 19, adjustable base insertion plate; 20, supporting seat; 21, vertical telescopic seat; 22, vertical positioning camera; 23, end lifting cylinder; 24, lifting plate; 25, vertical positioning scale; 26, end disassembly and assembly motor; 27, end disassembly and assembly gear; 28, side plate; 29, end clamping cylinder; 30, end clamping plate; 31, end clamping roller; 32, load-bearing insertion plate; 33, load-bearing plate; 34, bolt disassembly and assembly lifting cylinder; 35, bolt pressure sensor; 36, bolt disassembly and assembly motor; 37, limit insertion seat; 38, magnetic bolt sleeve head; 39, translation linear motor; 40, translation guide rail; 41, processing module; 42, wireless transfer module.

DETAILED DESCRIPTION

The present invention will now be described in further detail with reference to the accompanying drawings.

As shown in Figures 1-17, a perimeter warning device for bridge stress monitoring based on grating optical fiber includes a stress gauge 1, a stress gauge center scale 101, a stress gauge bolt 102, a connecting cable 2, a bearing 201, a connecting cable core 202, a rubber sleeve 203, a rotating ring 3, a gear ring 301, a fixed cable 4, a cable clamp 401, a fixed cable connector 402, a fixed cable core 403, a vertical positioning plate 404, a positioning plate scale 405, a track 5, a rack 501, a middle part 6, a base adjustment cylinder 7, a side part 8, a drive motor 9, a drive gear 10, a middle part lifting cylinder 11, a lifting base plate 12, a supporting pressure sensor 13, a supporting plate 14, a horizontal positioning camera 15, a horizontal positioning scale 1501, Telescopic plate bolt 16, rotating arm 17, rotating arm fastening bolt 1701, adjustable base body 18, body fastening bolt 1801, adjustable base insertion plate 19, supporting seat 20, vertical telescopic seat 21, vertical positioning camera 22, end head lifting cylinder 23, lifting plate 24, vertical positioning scale 25, end head disassembly and assembly motor 26, end head disassembly and assembly gear 27, side plate 28, end head clamping cylinder 29, end head clamping plate 30, end head clamping roller 31, load-bearing insertion plate 32, load-bearing plate 33, bolt disassembly and assembly lifting cylinder 34, bolt pressure sensor 35, bolt disassembly and assembly motor 36, limit insertion seat 37, magnetic bolt sleeve head 38, translation linear motor 39, translation guide rail 40, processing module 41 and wireless transfer module 42.

In conjunction with Figures 1-6, 8, 9, 10, 12, 13, 15, and 16, a perimeter warning device for bridge stress monitoring based on grating optical fiber includes: a plurality of strain gauges 1, a plurality of fixed cables 4, a track 5, an adjustable movable base, a bolt disassembly assembly component, an end disassembly assembly component, a horizontal positioning camera 15, and a height-adjustable positioning camera. The plurality of strain gauges 1 are installed on the bottom surface of the bridge along a linear layout through strain gauge bolts 102, the fixed cables 4 are fixedly installed on the bottom surface of the bridge through cable clamps 401 and are located on the extension line of the strain gauge 1. Preferably, one strain gauge 1 corresponds to two fixed cables 4, and the two fixed cables 4 are respectively located on both sides of the extension line of the corresponding strain gauge 1. The track 5 is installed on the bottom surface of the bridge and is located on both sides of the linear layout of the strain gauge 1. Specifically, the strain gauge 1 is a long cylindrical structure, and the track 5 is suspended and installed on the bottom surface of the bridge and is symmetrically arranged on the line of the strain gauge 1. The adjustable movable base is arranged on both sides of the track 5, the adjustable movable base includes a middle part 6, a side part 8 which is symmetrically arranged relative to the middle part 6, and a base adjustment mechanism for connecting the middle part 6 and the side part 8. Specifically, the number of the middle part 6 is one, and it is a rectangular structure, the number of the side parts 8 is two, and they are rectangular structures, the number of the base adjustment mechanisms is two and they are respectively located at the two ends of the middle part 6, the base adjustment mechanism includes a base adjustment cylinder 7, the base adjustment cylinder 7 is arranged at the two ends of the middle part 6, the output end of the base adjustment cylinder 7 is connected to the side part 8, and the side part 8 is provided with a driving mechanism detachably connected to the track 5. Preferably, the number of the driving mechanisms is two, and the two driving mechanisms are respectively arranged on the two side parts 8. When the driving mechanism is installed on the track 5, the driving mechanism can drive the adjustable movable base to move along the track 5. Specifically, the driving mechanism includes a driving motor 9. The driving motor 9 is arranged on the side portion 8, wherein the driving motors 9 corresponding to each of the two driving mechanisms are respectively arranged on the two side portions 8, the output end of the driving motor 9 is connected to the driving gear 10, the track 5 is a U-shaped structure with a side opening, and a rack 501 is arranged at the bottom of the track 5, and the driving gear 10 can be inserted into the U-shaped structure with a side opening of the track 5 and meshed with the rack 501. A stress gauge center scale 101 is arranged at the center position of the stress gauge 1, and a lifting mechanism is arranged on the middle portion 6. The lifting mechanism is driven and connected with a lifting base plate 12, and a supporting mechanism for supporting and limiting the stress gauge 1 is arranged on the lifting base plate 12. The horizontal positioning camera 15 is arranged on the supporting mechanism, and a horizontal positioning scale 1501 corresponding to the stress gauge center scale 101 is arranged on the lens of the horizontal positioning camera 15, and the center of the horizontal positioning scale 1501 is aligned with the center of the middle portion 6. The connecting line is perpendicular to the horizontal plane, and four angle-adjustable telescopic plates are arranged in a rectangular layout on the lifting base plate 12, and the bolt disassembly and assembly assembly is arranged on the angle-adjustable telescopic plate, wherein the lifting base plate 12 is a rectangular structure, and the four angle-adjustable telescopic plates are respectively located at the four corners of the rectangular structure of the lifting base plate 12, and the bolt disassembly and assembly assembly is used to disassemble and assemble the stress gauge bolt 102, and a fixed end head is arranged on the fixed cable 4, and connecting cables 2 are arranged on both sides of the strain gauge 1, and connecting end heads are arranged at the ends of the connecting cables 2, and the connecting end heads are detachably connected to the fixed end heads, and a vertical positioning plate 404 is arranged on the cable clamp 401, and a positioning plate scale 405 is arranged on the vertical positioning plate 404. Preferably, the connecting line between the projection point of the positioning plate scale 405 on the bottom surface of the bridge and the projection point of the center scale 101 of the stress gauge on the bottom surface of the bridge is parallel to the extension line of the strain gauge, and a There are two adjustable bases with a symmetrical layout, and the two adjustable bases are located on both sides of the lifting base plate 12. The end head disassembly and assembly component includes a lifting and translation mechanism, a lifting plate 24 and an end head disassembly and assembly mechanism, wherein the number of the end head disassembly and assembly components is two, and the two end head disassembly and assembly components are respectively arranged on the two adjustable bases, and the lifting and translation mechanism is arranged on the adjustable base. Specifically, the corresponding lifting and translation mechanisms in the two end head disassembly and assembly components are respectively arranged on the two adjustable bases, and the lifting and translation mechanism is driven and connected with the lifting plate 24, and the end head disassembly and assembly mechanism is arranged on the lifting plate 24. A vertical positioning scale 25 corresponding to the positioning plate scale 405 is arranged on the lens of the height adjustable positioning camera. Specifically, the height adjustable positioning camera includes a vertical telescopic seat 21 and a vertical positioning camera 22, and the vertical telescopic seat 21 is arranged on the bottom surface of the lifting plate 24, and the vertical positioning camera 22 is arranged on the vertical telescopic seat 2 1, the vertical positioning scale 25 is arranged on the lens of the vertical positioning camera 22, and a remote control processing center is arranged on the adjustable movable base, and the remote control processing center is electrically connected with the base adjustment mechanism, the driving mechanism, the lifting mechanism, the horizontal positioning camera 15, the bolt disassembly assembly component, the lifting and translation mechanism, the end disassembly assembly mechanism and the height adjustable positioning camera respectively, wherein the remote control processing center is electrically connected with the horizontal positioning camera 15, the vertical positioning camera 22, the base adjustment cylinder 7, and the driving motor 9 respectively, specifically, the remote control processing center includes a processing module 41 and a wireless transfer module 42, the wireless transfer module 42 is electrically connected with the processing module 41, and the processing module 41 is electrically connected with the base adjustment mechanism, the driving mechanism, the lifting mechanism, the horizontal positioning camera 15, the bolt disassembly assembly component, the lifting and translation mechanism, the end disassembly assembly mechanism and the height adjustable positioning camera respectively, specifically, the processing module 41 They are electrically connected to the horizontal positioning camera 15, the vertical positioning camera 22, the base adjustment cylinder 7, and the drive motor 9 respectively. When the strain gauge 1 to be replaced needs to be disassembled, firstly, according to the specifications of the strain gauge 1, the angle and length of the angle-adjustable telescopic plate are adjusted so that when the bolt disassembly assembly is located below the strain gauge 1 to be replaced, it is aligned with the strain gauge bolt 102 of the corresponding strain gauge 1, and the adjustable base is adjusted so that when the bolt disassembly assembly is aligned with the strain gauge bolt 102, the disassembly mechanism corresponds to the position of the connecting end head. According to the position of the positioning plate scale 405, the size of the connecting end head and the diameter of the connecting cable 2, the telescopic degree of the vertical telescopic seat 21 is adjusted so that the disassembly mechanism just moves to the connecting end head position so that the connecting end head can be disassembled, the vertical positioning scale 25 is aligned with the positioning plate scale 405, and then the drive mechanism is installed, and the drive gear 10 is inserted into the U-shaped structure of the track 5 so that the drive gear The wheel 10 is meshed with the rack 501, and the driving motor 9 drives the adjustable movable base to move to the position of the strain gauge 1 that needs to be disassembled. Then, under the action of the horizontal positioning camera 15, in conjunction with the horizontal positioning scale 1501 and the center scale 101 of the strain gauge, the driving motor 9 drives the middle part 6 to adjust its front and rear position, and the base adjustment cylinder 7 drives the middle part 6 to adjust its left and right position until the horizontal positioning scale 1501 is aligned with the center scale 101 of the strain gauge. When the horizontal positioning scale 1501 is aligned with the center scale 101 of the strain gauge, the lifting and translation mechanism drives the lifting plate 24 to move upward. Under the action of the vertical positioning camera 22, in conjunction with the vertical positioning scale 25 and the positioning plate scale 405, the lifting and translation mechanism adjusts the position of the vertical positioning camera 22 until the vertical positioning scale 25 is aligned with the positioning plate scale 405. At this time, the disassembly and assembly mechanism just moves to the position of the connection end head of the connecting cable 2 for disassembling the connection end head.

In conjunction with Figures 1-5, 10, and 13, the lifting mechanism includes a middle lifting cylinder 11, and the middle lifting cylinder 11 is arranged on the middle part 6. Preferably, the middle lifting cylinder 11 is located at the center of the middle part 6, and the output end of the middle lifting cylinder 11 is connected to the lifting base plate 12. The supporting mechanism includes a supporting pressure sensor 13, a supporting plate 14, and a supporting seat 20. The supporting pressure sensor 13 is arranged on the lifting base plate 12. Preferably, the supporting pressure sensor 13 is located at the center of the lifting base plate 12, and the supporting plate 14 is arranged at the sensing end of the supporting pressure sensor 13. Preferably, the supporting plate 14 is a rectangular structure, and the center of the supporting plate 14 coincides with the center of the lifting base plate 12. The supporting seat 20 is arranged on the supporting plate 14 to support the stress gauge 1. The horizontal positioning camera The head 15 is arranged on the support plate 14. Preferably, the horizontal positioning camera 15 is located at the center of the support plate 14, the center of the horizontal positioning scale 1501 coincides with the center of the support plate 14, and the support seat 20 is symmetrically arranged on the support plate 14 with the center of the support plate 14 as a reference. The middle lifting cylinder 11 and the supporting pressure sensor 13 are both electrically connected to the remote control processing center. Specifically, the middle lifting cylinder 11 and the supporting pressure sensor 13 are both electrically connected to the processing module 41. When the horizontal positioning scale 1501 is aligned with the center scale 101 of the stress gauge, the middle lifting cylinder 11 drives the support plate 14 to move upward, so that the support seat 20 supports the stress gauge 1. When the supporting pressure sensor 13 feels that the pressure is gradually increasing, the middle lifting cylinder 11 stops driving the support plate 14 to move upward.

As shown in Figures 1-5, 11, and 17, the angle-adjustable telescopic plate includes a telescopic plate bolt 16, a rotating arm 17, a bearing plate 33, and a rotating arm fastening bolt 1701. The telescopic plate bolt 16 passes through the rotating arm 17 and is rotatably connected to the rotating arm 17. The telescopic plate bolt 16 passes through the end of the rotating arm 17 and is threadedly connected to the lifting base plate 12. The bearing plate 33 is connected to a bearing insertion plate 32. The bearing insertion plate 32 is inserted into the rotating arm 17 and is slidably connected to the rotating arm 17. The rotating arm fastening bolt 1701 is threadedly connected to the rotating arm 17 and extends into the rotating arm 17 to abut against the bearing insertion plate 32. When the angle and length of the angle-adjustable telescopic plate are adjusted When adjusting, according to the specifications of the strain gauge 1, loosen the telescopic plate bolt 16 and adjust the angle of the rotating arm 17. After the angle is adjusted appropriately, tighten the telescopic plate bolt 16 to fix the angle of the rotating arm 17, and then loosen the rotating arm fastening bolt 1701 to adjust the distance between the rotating arm 17 and the supporting plate 33. When the distance is adjusted appropriately, tighten the rotating arm fastening bolt 1701 so that the rotating arm fastening bolt 1701 tightens the supporting insertion plate 32, so that the distance between the rotating arm 17 and the supporting plate 33 is in a fixed state. Preferably, the lifting base plate 12 is provided with a reference scale near the position of the angle-adjustable telescopic plate, and the deflection angle of the rotating arm 17 is better determined with the help of the reference scale.

With reference to Figures 1-5, 11 and 17, the bolt disassembly and assembly assembly includes a bolt disassembly and assembly lifting cylinder 34, the bolt disassembly and assembly lifting cylinder 34 is arranged on the bearing plate 33, the output end of the bolt disassembly and assembly lifting cylinder 34 is connected to a bolt pressure sensor 35, the sensing end of the bolt pressure sensor 35 is provided with a bolt disassembly and assembly motor 36, the output end of the bolt disassembly and assembly motor 36 is connected to a limited insertion seat 37, a magnetic bolt sleeve head 38 is detachably installed in the limited insertion seat 37, the bolt disassembly and assembly lifting cylinder 34, the bolt pressure sensor 35 and the bolt disassembly and assembly motor 36 are all electrically connected to the remote control processing center, specifically, preferably, the bolt disassembly and assembly lifting cylinder 34, the bolt pressure sensor 35 and the bolt disassembly and assembly motor 36 are all electrically connected to the processing module 41, and in the initial state, the supporting height of the supporting seat 20 is higher than the height of the magnetic bolt sleeve head 38, when the supporting seat 20 supports the strain gauge 1, the bolt disassembly and assembly The installation and lifting cylinder 34 drives the magnetic bolt sleeve head 38 to move upward to install the stress gauge bolt 102. When the bolt pressure sensor 35 feels the pressure gradually increasing, the bolt disassembly and assembly lifting cylinder 34 is suspended, and then the bolt disassembly and assembly motor 36 starts working, and the strain gauge bolt 102 is disassembled with the help of the magnetic bolt sleeve head 38. During the disassembly process, the bolt disassembly and assembly lifting cylinder 34 drives the magnetic bolt sleeve head 38 to gradually move downward to adapt to the disassembly of the stress gauge bolt 102. After the disassembly of the stress gauge bolt 102 is completed, the bolt disassembly and assembly lifting cylinder 34 continues to drive the magnetic bolt sleeve head 38 to move downward, and the bolt disassembly and assembly motor 36 stops working. Since the magnetic bolt sleeve head 38 and the limit insertion seat 37 are detachably connected, it is convenient to replace according to the specific specifications of the stress gauge bolt 102. The detachable connection method adopts a latch method, and can also be carried out in a snap-fit method.

As shown in Figures 1-4 and 14, the adjustable base includes an adjustable base body 18, an adjustable base insertion plate 19 and a body fastening bolt 1801. The adjustable base body 18 is arranged on the middle part 6 and is located on both sides of the lifting base plate 12. The adjustable base insertion plate 19 is inserted into the adjustable base body 18 and is slidably connected to the adjustable base body 18. The body fastening bolt 1801 is threadedly connected to the adjustable base body 18 and extends into the adjustable base body 18 to abut against the adjustable base insertion plate 19. When adjusting the adjustable base, the body fastening bolt 1801 is loosened according to the position of the connecting end head, and then the insertion degree of the adjustable base insertion plate 19 is adjusted, and then the body fastening bolt 1801 is tightened to complete the adjustment of the adjustable base.

As shown in Figures 1-5, 7-9, 12, and 14, the lifting and translation mechanism includes an end lifting cylinder 23 and a translation guide rail 40. The end lifting cylinder 23 is arranged on the adjustable base insertion plate 19. The output end of the end lifting cylinder 23 is installed with a translation linear motor 39. The translation guide rail 40 is arranged on the bottom surface of the lifting plate 24. The translation linear motor 39 is driven and connected to the translation guide rail 40. The translation linear motor 39 and the translation guide rail 40 are both electrically connected to the remote control processing center. Specifically, the translation linear motor 39 and the translation guide rail 40 are both electrically connected to the processing module 41. The end head disassembly and assembly mechanism includes an end head disassembly and assembly motor 26, a side plate 28 and an end head clamping cylinder 29. Specifically, the number of the side plate 28 and the end head clamping cylinder 29 is two. The end head disassembly and assembly motor 26 is arranged on the lifting plate 24. The output end of the end head disassembly and assembly motor 26 is connected to the end head disassembly and assembly gear 27. The side plate 28 is arranged on the lifting plate 24 and is located at the end head disassembly and assembly gear 27. 7 on both sides, the end head clamping cylinder 29 is arranged on the side plate 28, the output end of the end head clamping cylinder 29 is connected to the end head clamping plate 30, and the end head clamping plate 30 is rotatably connected to a plurality of end head clamping rollers 31, the end head disassembly motor 26 and the end head clamping cylinder 29 are both electrically connected to the remote control processing center, specifically, the end head disassembly motor 26 and the end head clamping cylinder 29 are both electrically connected to the processing module 41, the fixed end head includes a fixed cable connector 402, the fixed cable connector 402 is arranged at the end of the fixed cable 4, a fixed cable core 403 is arranged in the fixed cable connector 402 and extends to the outside of the fixed cable connector 402, wherein the fixed cable core 403 is connected to the cable inside the fixed cable 4 to ensure the transmission of the photoelectric signal, the connection end head includes a bearing 201, a rotating ring 3, a connection cable core 202 and a rubber sleeve 203, the bearing 201 is sleeved on the end of the connection cable 2, specifically, the connection cable 2 is a flexible cable The connecting cable core 202 is located inside the connecting cable 2 and the end portion extends outside the connecting cable 2, wherein the connecting cable core 202 is connected to the cable inside the connecting cable 2 to ensure the transmission of the photoelectric signal, the rotating ring 3 is sleeved outside the bearing 201 and is rotatably connected to the bearing 201, a toothed ring 301 is arranged on the outer periphery of the rotating ring 3, the toothed ring 301 can mesh with the end disassembly gear 27, the rotating ring 3 can be threadedly connected with the fixed cable connector 402, the rubber sleeve 203 is arranged on the connecting cable 2 and sleeved on the outer periphery of the connecting cable core 202, the area size of the connecting cable core 202 corresponds to the area size of the fixed cable core 403, when the connecting end head and the fixed end head are connected and installed, the rotating ring 3 is threadedly connected to the fixed cable connector 402 to realize the connection and installation of the connecting end head and the fixed end head, at this time, the fixed cable core 403 is fitted with the connecting cable core 202, and at the same time, the rubber sleeve 203 fits the fixed cable core 403 with the connecting cable core 202 The lifting plate 24 is driven to move upward under the action of the end lifting cylinder 23. After the vertical positioning scale 25 is aligned with the positioning plate scale 405, the end disassembly gear 27 is meshed with the gear ring 301, and the end clamping cylinder 29 drives the end clamping plate 30 to clamp the rotating ring 3 and the gear ring 301 through the end clamping roller 31. Then the end disassembly motor 26 drives the end disassembly gear 27 to rotate. During the rotation of the end disassembly gear 27, the translation linear motor 39 starts to work and drives the lifting plate 24 to move away from the fixed cable 4. With the progress of the movement and the rotation of the end disassembly gear 27, the rotating ring 3 can be disassembled on the fixed cable connector 402. After the disassembly is completed, the end lifting cylinder 23 drives the lifting plate 24 to move downward. The fixed cable 4 can be used for photoelectric signal transmission between stress gauges 1 with different linear layouts, and can also be directly connected to an external acquisition device to receive photoelectric signals.

As shown in Figures 1-8, 10, 11, 13, and 14, when installing the replaced stress gauge 1, place the stress gauge 1 on the supporting seat 20, place the stress gauge bolt 102 in the magnetic bolt sleeve head 38, place the rotating ring 3 in the end clamping plate 30 and be clamped by the end clamping roller 31, then install the driving mechanism in the track 5, return along the disassembly path, and then install it. Since the stress gauge bolt 102 has been drilled on the bottom surface of the bridge to form a hole groove when the stress gauge 1 was first installed, when installing the disassembled stress gauge bolt 102, it is only necessary to make the hole groove correspond to the position of the stress gauge bolt 102, and there is no need to re-drill.

As shown in Figures 1-5, for the disassembly and assembly process, since the specifications and corresponding positions of the strain gauge 1 are already known when the strain gauge 1 is initially installed, when the strain gauge 1 fails or needs maintenance, the specific position of the strain gauge 1 that needs to be disassembled can be known, and the processing module 41 in the remote control processing center can be used to set the program to complete the disassembly and assembly work. The wireless relay module 42 can also be used to interact with the external remote control device through wireless signals, and the wireless relay module and the processing module can be used to complete the disassembly and assembly work together.

Working principle: During disassembly, according to the specifications of the strain gauge 1 to be disassembled, the angle-adjustable telescopic plate and the adjustable base are adjusted, and according to the position of the positioning plate scale 405, the height of the vertical positioning camera 22 is adjusted, and then the driving mechanism is installed in the track 5. Then, under the action of the driving mechanism, the middle part 6 is driven to move to the position of the strain gauge 1, and the horizontal position is obtained with the help of the horizontal positioning camera 15. The horizontal position of the middle part 6 is adjusted by the base adjustment mechanism and the driving mechanism, and then the strain gauge 1 is supported by the supporting seat 20, and the strain gauge bolt 102 is disassembled with the help of the bolt disassembly assembly, and the vertical position is recorded with the help of the vertical positioning camera 22. To obtain the vertical position, under the action of the lifting and translation mechanism, the disassembly and assembly mechanism moves to the connection end head, and the disassembly and assembly mechanism cooperates with the translation linear motor 39 to complete the disassembly of the connection end head. After all disassembly is completed, under the action of the driving mechanism, the middle part 6 moves to the staff position, and then the driving mechanism is removed from the track 5, so as to facilitate the subsequent removal of the strain gauge 1. When installing the strain gauge 1, after the strain gauge 1, the strain gauge bolt 102 and the connection end head are placed, the driving mechanism is installed in the track 5, and returns to the disassembly position along the disassembly path, and then the strain gauge 1 can be installed. The specific installation process is opposite to the disassembly process flow.

The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description in the specification are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims (10)

1. A perimeter alert device for bridge stress monitoring based on a grating fiber, comprising: the device comprises a plurality of stress meters (1), a plurality of fixed cables (4), a track (5), an adjustable movable base, a bolt dismounting assembly, an end dismounting assembly, a horizontal positioning camera (15) and a height-adjustable positioning camera, and is characterized in that;

The stress meters (1) are arranged on the bottom surface of the bridge along the linear layout through stress meter bolts (102), the fixed cables (4) are fixedly arranged on the bottom surface of the bridge through cable clamps (401) and positioned on extension lines of the stress meters (1), and the rails (5) are arranged on the bottom surface of the bridge and positioned on two sides of the linear layout of the stress meters (1);

The adjustable movable base comprises a middle part (6), side edge parts (8) which are symmetrically distributed relative to the middle part (6) and a base adjusting mechanism used for connecting the middle part (6) and the side edge parts (8), wherein a driving mechanism which is detachably connected with the track (5) is arranged on the side edge parts (8), and when the driving mechanism is arranged on the track (5), the driving mechanism can drive the adjustable movable base to move along the track (5);

a stress meter center scale (101) is arranged at the center of the stress meter (1);

The device is characterized in that a lifting mechanism is arranged on the middle part (6), the lifting mechanism is in driving connection with a lifting base plate (12), a bearing mechanism used for bearing and limiting the stress meter (1) is arranged on the lifting base plate (12), a horizontal positioning camera (15) is arranged on the bearing mechanism, a horizontal positioning scale (1501) corresponding to a center scale (101) of the stress meter is arranged on a lens of the horizontal positioning camera (15), and a connecting line between the center of the horizontal positioning scale (1501) and the center of the middle part (6) is perpendicular to a horizontal plane;

four angle-adjustable expansion plates are arranged on the lifting base plate (12) in a rectangular layout, and the bolt dismounting assembly is arranged on the angle-adjustable expansion plates and is used for dismounting the stress gauge bolts (102);

The cable fixing device is characterized in that fixed end heads are arranged on the fixed cables (4), connecting cables (2) are arranged on two sides of the stress gauge (1), connecting end heads are arranged at the ends of the connecting cables (2), the connecting end heads are detachably connected with the fixed end heads, vertical positioning plates (404) are arranged on the cable clamps (401), and positioning plate scales (405) are arranged on the vertical positioning plates (404);

Two adjustable bases which are symmetrically distributed are arranged on the middle part (6), the two adjustable bases are positioned on two sides of the lifting base plate (12), the end head dismounting assembly comprises a lifting translation mechanism, a lifting plate (24) and an end head dismounting mechanism, the lifting translation mechanism is arranged on the adjustable base, the lifting translation mechanism is in driving connection with the lifting plate (24), the end head dismounting mechanism is arranged on the lifting plate (24), and a vertical positioning scale (25) which corresponds to the positioning plate scale (405) is arranged on the height-adjustable positioning camera lens;

the adjustable movable base is provided with a remote control processing center which is electrically connected with the base adjusting mechanism, the driving mechanism, the lifting mechanism, the horizontal positioning camera (15), the bolt dismounting assembly, the lifting translation mechanism, the end dismounting mechanism and the height-adjustable positioning camera respectively;

When needs are right stress meter (1) dismantles the specification of stress meter (1), adjust as required the adjustable expansion plate of angle and adjustable base, make bolt dismouting subassembly position can correspond with stress meter bolt (102) that stress meter (1) that needs to dismantle, make dismouting mechanism position can correspond each other with connecting end portion, will actuating mechanism installs on track (5) under actuating mechanism's effect, bearing mechanism removes to the stress meter (1) position department that needs to dismantle, with the help of horizontal positioning camera (15), cooperation actuating mechanism and base adjustment intermediate part (6) are adjusted to the position, make horizontal positioning scale (1501) align with stress meter center scale (101), with the help of highly adjustable positioning camera, cooperation elevating translation mechanism adjusts the position of lifter plate (24), makes vertical positioning scale (25) align with connecting end portion each other with positioning plate scale (405), later with the help of bearing mechanism carries out the effect of dismantling stress meter (1) to the end portion under the action of bearing translation mechanism, the bearing translation mechanism carries out the dismantlement bolt (102) to the end of need to dismantlement.

2. A perimeter alert device for bridge stress monitoring based on grating fiber according to claim 1, wherein: the base adjusting mechanism comprises a base adjusting cylinder (7), the base adjusting cylinder (7) is arranged at two ends of the middle part (6), the output end of the base adjusting cylinder (7) is connected with the side edge part (8), and the base adjusting cylinder (7) is electrically connected with the remote control processing center.

3. A perimeter alert device for bridge stress monitoring based on grating fiber according to claim 1, wherein: the driving mechanism comprises a driving motor (9), the driving motor (9) is arranged on the side edge part (8), the output end of the driving motor (9) is connected with a driving gear (10), the track (5) is of a U-shaped structure with an open side surface, a rack (501) is arranged in the track (5), the driving gear (10) can be inserted into the U-shaped structure with the open side surface of the track (5) and meshed with the rack (501), and the driving motor (9) is electrically connected with a remote control processing center.

4. A perimeter alert device for bridge stress monitoring based on grating fiber according to claim 1, wherein: the lifting mechanism comprises a middle lifting cylinder (11), the middle lifting cylinder (11) is arranged on a middle part (6), the output end of the middle lifting cylinder (11) is connected with a lifting base plate (12), the bearing mechanism comprises a bearing pressure sensor (13), a bearing plate (14) and a bearing seat (20), the bearing pressure sensor (13) is arranged on the lifting base plate (12), the bearing plate (14) is arranged at the sensing end of the bearing pressure sensor (13), the bearing seat (20) is arranged on the bearing plate (14) and used for bearing the stress gauge (1), the horizontal positioning camera (15) is arranged on the bearing plate (14), and the middle lifting cylinder (11) and the bearing pressure sensor (13) are electrically connected with a remote control processing center.

5. A perimeter alert device for bridge stress monitoring based on grating fiber according to claim 1, wherein: the adjustable expansion plate of angle includes expansion plate bolt (16), rotor arm (17), loading board (33) and rotor arm fastening bolt (1701), expansion plate bolt (16) pass rotor arm (17) and rotate with rotor arm (17) and be connected, expansion plate bolt (16) pass rotor arm (17) tip threaded connection on lifting substrate (12), loading board (33) are connected with and bear insert board (32), bear insert board (32) insert in rotor arm (17) and with rotor arm (17) sliding connection, rotor arm fastening bolt (1701) and rotor arm (17) threaded connection, and extend to in rotor arm (17) with bear insert board (32) butt.

6. The perimeter alert device for bridge stress monitoring based on fiber grating of claim 5, wherein: bolt dismouting subassembly includes bolt dismouting lift jar (34), bolt dismouting lift jar (34) set up on loading board (33), bolt dismouting lift jar (34) output is connected with bolt pressure sensor (35), be provided with bolt dismouting motor (36) on bolt pressure sensor (35) response end, bolt dismouting motor (36) output is connected with spacing cartridge (37), demountable installation has magnetism to inhale bolt sleeve head (38) in spacing cartridge (37), bolt dismouting lift jar (34), bolt pressure sensor (35) and bolt dismouting motor (36) all with remote control processing center electric connection.

7. A perimeter alert device for bridge stress monitoring based on grating fiber according to claim 1, wherein: the adjustable base comprises an adjustable base seat body (18), an adjustable base seat inserting plate (19) and base seat fastening bolts (1801), wherein the adjustable base seat body (18) is arranged on the middle portion (6) and located on two sides of the lifting base plate (12), the adjustable base seat inserting plate (19) is inserted into the adjustable base seat body (18) and is in sliding connection with the adjustable base seat body (18), and the base seat fastening bolts (1801) are in threaded connection with the adjustable base seat body (18) and extend to the inside of the adjustable base seat body (18) to be in butt with the adjustable base seat inserting plate (19).

8. The perimeter alert device for bridge stress monitoring based on fiber gratings as recited in claim 7, wherein: the lifting translation mechanism comprises an end lifting cylinder (23) and a translation guide rail (40), the end lifting cylinder (23) is arranged on an adjustable base insert plate (19), a translation linear motor (39) is arranged at the output end of the end lifting cylinder (23), the translation guide rail (40) is arranged on the bottom surface of the lifting plate (24), the translation linear motor (39) is connected with the translation guide rail (40) in a driving mode, the translation linear motor (39) and the translation guide rail (40) are electrically connected with a remote control processing center, the end dismounting mechanism comprises an end dismounting motor (26), a side plate (28) and an end clamping cylinder (29), the end dismounting motor (26) is arranged on the lifting plate (24), the output end dismounting motor (26) is connected with an end dismounting gear (27), the side plate (28) is arranged on two sides of the lifting plate (24), the end clamping cylinder (29) is connected with an end clamping plate (30), and the end clamping cylinder (30) is connected with an end clamping roller (30) in a rotating mode, and the end clamping roller (31) is connected with the end clamping roller (29) in a rotating mode.

9. The perimeter alert device for bridge stress monitoring based on fiber gratings as recited in claim 8, wherein: the fixed end head portion comprises a fixed cable connector (402), the fixed cable connector (402) is arranged at the end portion of a fixed cable (4), a fixed cable core (403) is arranged in the fixed cable connector (402) and extends to the outside of the fixed cable connector (402), the connecting end head portion comprises a bearing (201), a rotating ring (3), a connecting cable core (202) and a rubber sleeve (203), the bearing (201) is sleeved at the end portion of a connecting cable (2), the connecting cable core (202) is arranged in the connecting cable (2) and extends to the outside of the connecting cable (2) at the end portion, the rotating ring (3) is sleeved outside the bearing (201) and is in rotary connection with the bearing (201), the rotating ring (3) is provided with a toothed ring (301), the toothed ring (301) can be meshed with an end dismounting gear (27), the rotating ring (3) can be in threaded connection with the fixed cable connector (402), the rubber sleeve (203) is arranged on the connecting cable (2) and is sleeved at the periphery of the connecting cable core (202), and the connecting cable core (403) is small in area and the large area of the connecting cable core (403) corresponds to the large area of the connecting cable core.

10. A perimeter alert device for bridge stress monitoring based on grating fiber according to claim 1, wherein: the height-adjustable positioning camera comprises a vertical telescopic seat (21) and a vertical positioning camera (22), wherein the vertical telescopic seat (21) is arranged on the bottom surface of a lifting plate (24), the vertical positioning camera (22) is arranged on the vertical telescopic seat (21), a vertical positioning scale (25) is arranged on the lens of the vertical positioning camera (22), and the vertical positioning camera (22) is electrically connected with a remote control processing center.