CN118603376A - 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

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, in particular to a perimeter warning device for bridge stress monitoring based on grating optical fibers.

Background

In the using process of the bridge, the stress change of the bridge is required to be monitored, and the stress state of the bridge is acquired in advance, so that possible safety accidents are avoided, namely, the condition of the bridge stress change is acquired through perimeter warning of the bridge stress, and the bridge stress change is acquired in advance before the accident occurs so as to perform early warning maintenance in time.

When bridge stress monitoring is carried out, a grating fiber stress meter is usually adopted, the grating fiber principle is utilized to achieve the purpose of monitoring, when the grating fiber is utilized to monitor bridge stress, the grating fiber stress meter is required to be installed on the bridge, the specific installation quantity is selected according to the size of the bridge, then the bridge is connected with external acquisition equipment through an optical cable, the stress change of the bridge is acquired through the acquisition equipment, for a large-scale bridge, the number of the grating fiber stress monitoring devices required to be installed is large, the installation of the stress meter is usually carried out in the bridge construction process, after the bridge construction is completed, an inspection channel for daily inspection is usually reserved at the bottom of two sides of the bridge, when the daily inspection is carried out, workers walk at two sides of the bridge through the inspection channel to observe the state of the bridge, with the use, when part of the grating fiber stress monitoring devices are in fault, even though the workers work ladder or work frame are required to replace the grating fiber stress monitoring devices with the help of the work ladder or work frame, the bridge is still required to be replaced, and the bridge is more in number and more complicated in replacement and the bridge construction period is more in time and the period is more in need of the inspection period is more complicated, and the bridge is more in design and more is based on the inspection period.

Disclosure of Invention

The invention aims to solve the technical problems that: under the condition that an artificial ladder or an artificial frame is not required to be built, the grating fiber stress meter with problems can be replaced only by means of a reserved maintenance channel, and the position of the grating fiber stress meter can be accurately found during replacement, so that the smooth replacement is ensured.

The technical scheme adopted to solve the technical problems is as follows: a perimeter alert device for bridge stress monitoring based on a grating fiber, comprising: 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;

The strain gauges are arranged on the bottom surface of the bridge along the linear layout through strain gauge bolts, the fixed cables are fixedly arranged on the bottom surface of the bridge through cable clamps and positioned on extension lines of the strain gauges, and the tracks are arranged on the bottom surface of the bridge and positioned on two sides of the linear layout of the strain gauges;

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

The center position of the stress meter is provided with a stress meter center scale;

The middle part is provided with a lifting mechanism, the lifting mechanism is in driving connection with a lifting substrate, the lifting substrate is provided with a bearing mechanism for bearing and limiting the stress meter, the horizontal positioning camera is arranged on the bearing mechanism, the horizontal positioning camera lens is provided with a horizontal positioning scale corresponding to the central scale of the stress meter, and the connecting line of the central of the horizontal positioning scale and the central of the middle part is perpendicular to a horizontal plane;

Four angle-adjustable expansion plates are arranged on the lifting base plate in a rectangular layout, the bolt dismounting assembly is arranged on the angle-adjustable expansion plates, and the bolt dismounting assembly is used for dismounting the stress meter bolts;

The cable clamp is characterized in that a fixed end head is arranged on the fixed cable, connecting cables are arranged on two sides of the stress gauge, a connecting end head is arranged at the end part of the connecting cable, the connecting end head is detachably connected with the fixed end head, a vertical positioning plate is arranged on the cable clamp, and positioning plate scales are arranged on the vertical positioning plate;

The middle part is provided with two adjustable bases which are symmetrically distributed, the two adjustable bases are positioned at two sides of the lifting base plate, the end head dismounting assembly comprises a lifting translation mechanism, a lifting plate 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, the end head dismounting mechanism is arranged on the lifting plate, and the height-adjustable positioning camera lens is provided with vertical positioning scales which correspond to the positioning plate scales;

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

When the stress meter is required to be disassembled, the angle-adjustable expansion plate and the adjustable base are adjusted according to the specification of the stress meter required to be disassembled, so that the position of the bolt disassembly assembly can be corresponding to the stress meter bolt required to be disassembled, the disassembly and assembly mechanism can be mutually corresponding 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 meter required to be disassembled, the position of the middle part is adjusted by the aid of the horizontal positioning camera and the driving mechanism and the base adjusting mechanism, the position of the horizontal positioning scale is aligned with the center scale of the stress meter, the position of the lifting plate is adjusted by the aid of the height-adjustable positioning camera and the lifting translating mechanism, the vertical positioning scale is aligned with the scale of the positioning plate, then the supporting mechanism is used for supporting the stress meter required to be disassembled, and the connecting end head is disassembled by the aid of the stress meter bolt corresponding to the bolt required to be disassembled, and the disassembly of the connecting end head is performed under the action of the disassembly mechanism and the lifting translating mechanism.

As a preferable technical scheme of the invention, the base adjusting mechanism comprises base adjusting cylinders, the base adjusting cylinders are arranged at two ends of the middle part, the output ends of the base adjusting cylinders are connected with the side edge parts, and the base adjusting cylinders are electrically connected with the remote control processing center.

As a preferable technical scheme of the invention, the driving mechanism comprises a driving motor, the driving motor is arranged on the side edge part, the output end of the driving motor is connected with a driving gear, the track is of a U-shaped structure with an opening on the side surface, a rack is arranged at the bottom in the track, the driving gear can be inserted into the U-shaped structure with the opening on the side surface of the track and is meshed with the rack, and the driving motor is electrically connected with the remote control processing center.

As a preferable technical scheme of the invention, the lifting mechanism comprises a middle lifting cylinder, the middle lifting cylinder is arranged on the middle part, the output end of the middle lifting cylinder is connected with the lifting base plate, the bearing mechanism comprises a bearing pressure sensor, a bearing plate and a bearing seat, the bearing pressure sensor is arranged on the lifting base plate, the bearing plate is arranged at the induction end of the bearing pressure sensor, the bearing seat is arranged on the bearing plate and used for bearing the stress meter, the horizontal positioning camera is arranged on the bearing plate, and the middle lifting cylinder and the bearing pressure sensor are electrically connected with the remote control processing center.

As a preferable technical scheme of the invention, the angle-adjustable expansion plate comprises an expansion plate bolt, a rotating arm, a bearing plate and a rotating arm fastening bolt, wherein the expansion plate bolt penetrates through the rotating arm and is in rotating connection with the rotating arm, the expansion plate bolt penetrates through the end part of the rotating arm to be in threaded connection with the lifting base plate, the bearing plate is connected with a bearing insertion plate, the bearing insertion plate is inserted into the rotating arm and is in sliding connection with the rotating arm, and the rotating arm fastening bolt is in threaded connection with the rotating arm and extends into the rotating arm to be in abutting connection with the bearing insertion plate.

As a preferable technical scheme of the invention, the bolt dismounting assembly comprises a bolt dismounting lifting cylinder, the bolt dismounting lifting cylinder is arranged on a bearing plate, the output end of the bolt dismounting lifting cylinder is connected with a bolt pressure sensor, the sensing end of the bolt pressure sensor is provided with a bolt dismounting motor, the output end of the bolt dismounting motor is connected with a limiting insertion seat, a magnetic bolt sleeve head is detachably arranged in the limiting insertion seat, and the bolt dismounting lifting cylinder, the bolt pressure sensor and the bolt dismounting motor are electrically connected with a remote control processing center.

As a preferable technical scheme of the invention, the adjustable base comprises an adjustable base seat body, an adjustable base seat insert plate and seat body fastening bolts, wherein the adjustable base seat body is arranged on the middle part and positioned at two sides of the lifting base plate, the adjustable base seat insert plate is inserted into the adjustable base seat body and is in sliding connection with the adjustable base seat body, and the seat body fastening bolts are in threaded connection with the adjustable base seat body and extend into the adjustable base seat body to be in butt joint with the adjustable base seat insert plate.

As a preferable technical scheme of the invention, the lifting translation mechanism comprises an end lifting cylinder and a translation guide rail, wherein the end lifting cylinder is arranged on the adjustable base insertion plate, a translation linear motor is arranged at the output end of the end lifting cylinder, the translation guide rail is arranged on the bottom surface of the lifting plate, the translation linear motor is in driving connection with the translation guide rail, the translation linear motor and the translation guide rail are electrically connected with a remote control processing center, the end disassembly and assembly mechanism comprises an end disassembly motor, a side plate and an end clamping cylinder, the end disassembly motor is arranged on the lifting plate, the output end of the end disassembly motor is connected with an end disassembly gear, the side plate is arranged on the lifting plate and positioned on two sides of the end disassembly gear, the end clamping cylinder is arranged on the side plate, the output end clamping cylinder is connected with an end clamping plate, a plurality of end clamping rotating rollers are rotationally connected on the end clamping plate, and the end disassembly motor and the end clamping cylinder are electrically connected with the remote control processing center.

As a preferable technical scheme of the invention, the fixed end head comprises a fixed cable connector, the fixed cable connector is arranged at the end part 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 comprises a bearing, a rotating ring, a connecting cable core and a rubber sleeve, the bearing is sleeved at the end part of the connecting cable, the connecting cable core is positioned in the connecting cable, the end part of the connecting cable core extends to the outside of the connecting cable, the rotating ring is sleeved outside the bearing and is rotationally connected with the bearing, the periphery of the rotating ring is provided with a toothed ring, the toothed ring can be meshed with an end dismounting gear, the rotating ring can be in threaded connection with the fixed cable connector, the rubber sleeve is arranged on the connecting cable and is sleeved at the periphery of the connecting cable core, and the area of the connecting cable core corresponds to the area of the connecting cable core.

As a preferable technical scheme of the invention, the height-adjustable positioning camera comprises a vertical telescopic seat and a vertical positioning camera, wherein 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, and the vertical positioning camera is electrically connected with the remote control processing center.

The beneficial effects of the invention are as follows:

Through setting up horizontal positioning camera, under the reference of horizontal positioning scale and stress meter center scale, through actuating mechanism and base guiding mechanism to adjust the horizontal position of mid portion, through setting up height-adjustable positioning camera, under the reference of vertical positioning scale and locating plate scale, adjust the vertical position of lifter plate through lift translation mechanism, thereby ensure going on smoothly of follow-up dismantlement work.

Through setting up elevating system cooperation bearing mechanism to can carry out the bearing to the stress meter, through setting up the adjustable expansion plate cooperation bolt dismouting subassembly of angle, thereby can dismantle or install the stress meter bolt, through setting up adjustable base cooperation end dismouting subassembly, thereby can dismantle or install the link end portion, the bearing of stress meter, the dismouting of stress meter bolt and the dismouting of link end portion, thereby after the bridge construction, need not to build under the condition of artifical ladder or artifical frame, only need with the help of the maintenance passageway of staying, can change the grating fiber stress meter that has the problem, cooperation horizontal positioning camera simultaneously, vertical positioning camera, horizontal positioning scale, stress meter center scale, locating plate scale and vertical positioning scale, the position of looking for the grating fiber stress meter that can be accurate when changing, in order to ensure going on smoothly of changing.

Because actuating mechanism can with track demountable installation to accomplish the installation when needing, dismantle when not needing, avoid the damage when parts such as actuating mechanism, adjustable removal base are located the bridge bottom surface all the time, only need prepare parts such as a small amount of actuating mechanism, adjustable removal base simultaneously can deal with the dismouting of all stress gauges on the bridge, reduce overall cost.

The stroke range of the lifting cylinder at the middle part during upward driving is determined by means of the pressure sensing mode through the supporting pressure sensor, and the stroke range of the lifting cylinder during upward driving during bolt disassembly and assembly is determined by means of the pressure sensing mode through the bolt pressure sensor.

Through adopting magnetism to inhale bolt sleeve head to when carrying out the dismouting of stress meter bolt, can inhale the stress meter bolt magnetism, avoid the dismouting in-process stress meter bolt to drop.

The magnetic bolt sleeve head and the limiting insertion seat are detachably mounted, so that the corresponding magnetic bolt sleeve head can be selected according to the specification of a specific stress meter bolt.

Drawings

FIG. 1 is a schematic bottom view of the overall invention;

FIG. 2 is a schematic front view of an adjustable motion base and the like of the present invention;

FIG. 3 is a schematic top view of an adjustable motion base and the like according to the present invention;

FIG. 4 is a schematic bottom view of an adjustable motion base and the like according to the present invention;

FIG. 5 is a schematic bottom view of a strain gauge or the like of the present invention;

FIG. 6 is a schematic view of a track portion of the present invention;

FIG. 7 is a schematic view of the invention connecting a terminal head with a fixed end head;

FIG. 8 is a schematic side view of a fixed end head portion and the like of the present invention;

FIG. 9 is a schematic view of a height adjustable positioning camera portion of the present invention;

FIG. 10 is an enlarged schematic view of portion A of FIG. 2 in accordance with the present invention;

FIG. 11 is an enlarged schematic view of portion B of FIG. 2 in accordance with the present invention;

FIG. 12 is an enlarged schematic view of portion C of FIG. 2 in accordance with the present invention;

FIG. 13 is an enlarged schematic view of portion D of FIG. 3 in accordance with the invention;

FIG. 14 is an enlarged schematic view of portion E of FIG. 3 in accordance with the present invention;

FIG. 15 is an enlarged schematic view of portion F of FIG. 6 in accordance with the present invention;

FIG. 16 is an enlarged schematic view of portion G of FIG. 2 in accordance with the present invention;

Fig. 17 is an enlarged schematic view of the portion H of fig. 2 in accordance with the present invention.

In the figure: 1. a stress meter; 101. a stress meter center scale; 102. a stress gauge bolt; 2. a connection cable; 201. a bearing; 202. connecting the cable core; 203. a rubber sleeve; 3. a rotating ring; 301. a toothed ring; 4. fixing the cable; 401. a cable clamp; 402. fixing the cable connector; 403. fixing the cable core; 404. a vertical positioning plate; 405. a positioning plate scale; 5. a track; 501. a rack; 6. an intermediate portion; 7. a base adjustment cylinder; 8. a side edge portion; 9. a driving motor; 10. a drive gear; 11. a middle lifting cylinder; 12. lifting the substrate; 13. supporting the pressure sensor; 14. a bearing plate; 15. horizontally positioning the camera; 1501. horizontally positioning scales; 16. a telescoping plate bolt; 17. a rotating arm; 1701. rotating arm fastening bolts; 18. an adjustable base seat; 1801. a base body fastening bolt; 19. an adjustable base insert plate; 20. a support bracket; 21. a vertical telescopic seat; 22. positioning a camera vertically; 23. an end lifting cylinder; 24. a lifting plate; 25. positioning scales vertically; 26. a motor is disassembled and assembled at the end; 27. the gear is disassembled and assembled at the end; 28. a side plate; 29. an end clamping cylinder; 30. an end clamping plate; 31. the end clamps the rotary roller; 32. carrying an insert plate; 33. a carrying plate; 34. disassembling and assembling the lifting cylinder by bolts; 35. a bolt pressure sensor; 36. disassembling and assembling the motor by bolts; 37. limiting and inserting the seat; 38. magnetic attraction bolt sleeve head; 39. a translation linear motor; 40. translating the guide rail; 41. a processing module; 42. and the wireless transfer module.

Detailed Description

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

Referring to fig. 1-17, a perimeter warning device for bridge stress monitoring based on grating fiber includes a stress meter 1, a stress meter center scale 101, a stress meter bolt 102, a connecting cable 2, a bearing 201, a connecting cable core 202, a rubber sleeve 203, a rotating ring 3, a toothed 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 adjusting cylinder 7, a side part 8, a driving motor 9, a driving gear 10, a middle part lifting cylinder 11, a lifting base plate 12, a bearing pressure sensor 13, a bearing plate 14, a horizontal positioning camera 15, a horizontal positioning scale 1501, a telescoping plate bolt 16, a rotating arm 17, a rotating arm fastening bolt 18, a seat body fastening bolt 1801, an adjustable seat insert plate 19, a bearing seat 20, a vertical telescoping seat 21, a vertical positioning camera 22, a head lifting cylinder 23, a lifting plate 24, a vertical positioning scale 25, a dismounting motor 26, a head gear 27, a side plate 28, a bearing end plate 30, a bearing roller 31, a linear positioning cylinder 37, a lifting cylinder clamp bolt 40, a linear positioning cylinder clamp bolt 35, a bearing plate 37, a linear clamp cylinder 37, a linear clamp bolt 40, a lifting and a translation screw-type bearing module 37.

1-6, 8, 9, 10, 12, 13, 15, 16, A perimeter alert device for bridge stress monitoring based on a grating fiber, comprising: a plurality of stress meters 1, a plurality of fixed cables 4, a track 5, an adjustable movable base, a bolt dismounting component, an end dismounting component, a horizontal positioning camera 15 and a height adjustable positioning camera, wherein the stress meters 1 are arranged on the bottom surface of a bridge along a 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 are positioned on the extension line of the stress meters 1, preferably, one stress meter 1 corresponds to two fixed cables 4, The two fixed cables 4 are respectively positioned at two sides of the extension line of the corresponding stress meter 1, the track 5 is arranged at the bottom surface of the bridge and positioned at two sides of the linear layout of the stress meter 1, the stress meter 1 is in a strip cylindrical structure, the track 5 is suspended and arranged at the bottom surface of the bridge and positioned at two sides of the linear layout of the stress meter 1 in a symmetrical layout, the adjustable movable base comprises a middle part 6, side parts 8 which are symmetrically arranged relative to the middle part 6 and a base adjusting mechanism for connecting the middle part 6 and the side parts 8, the number of the middle parts 6 is one, the middle part is in a rectangular structure, the number of the side parts 8 is two, The base adjusting mechanism comprises base adjusting cylinders 7, the base adjusting cylinders 7 are arranged at two ends of the middle part 6, the output ends of the base adjusting cylinders 7 are connected with side edge parts 8, driving mechanisms detachably connected with the track 5 are arranged on the side edge parts 8, preferably, the number of the driving mechanisms is two, the two driving mechanisms are respectively arranged on the two side edge parts 8, when the driving mechanisms are arranged on the track 5, the driving mechanisms can drive the adjustable moving base to move along the track 5, in particular, the driving mechanisms comprise driving motors 9, The driving motor 9 is arranged on the side edge part 8, wherein the driving motors 9 corresponding to the two driving mechanisms are respectively arranged on the two side edge parts 8, the output end of the driving motor 9 is connected with a driving gear 10, the rail 5 is of a U-shaped structure with an open side surface, a rack 501 is arranged in the bottom of the rail 5, the driving gear 10 can be inserted into the U-shaped structure with the open side surface of the rail 5 and is meshed with the rack 501, the center position of the stress meter 1 is provided with a stress meter center scale 101, the middle part 6 is provided with a lifting mechanism, the lifting mechanism is in driving connection with a lifting base plate 12, the lifting base plate 12 is provided with a bearing mechanism for bearing and limiting the stress meter 1, The horizontal positioning camera 15 is arranged on the supporting mechanism, the lens of the horizontal positioning camera 15 is provided with a horizontal positioning scale 1501 corresponding to the center scale 101 of the stress meter, the connecting line between the center of the horizontal positioning scale 1501 and the center of the middle part 6 is perpendicular to the horizontal plane, the lifting base plate 12 is provided with four angle-adjustable expansion plates in rectangular layout, the bolt dismounting assembly is arranged on the angle-adjustable expansion plates, wherein the lifting base plate 12 is in a rectangular structure, the four angle-adjustable expansion plates are respectively positioned at four corners of the rectangular structure of the lifting base plate 12, the bolt dismounting assembly is used for dismounting the stress meter bolts 102, The fixed cable 4 is provided with a fixed end head, the two sides of the stress meter 1 are provided with connecting cables 2, the end parts of the connecting cables 2 are provided with connecting end heads, the connecting end heads are detachably connected with the fixed end heads, the cable clamp 401 is provided with a vertical positioning plate 404, the vertical positioning plate 404 is provided with a positioning plate scale 405, preferably, the connection 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 meter on the bottom surface of the bridge is parallel to the extension line of the stress meter, the middle part 6 is provided with two adjustable bases which are symmetrically distributed, the two adjustable bases are positioned on the two sides of the lifting base plate 12, the end head dismounting assembly comprises a lifting translation mechanism, a lifting plate 24 and end head dismounting mechanisms, wherein the number of the end head dismounting assemblies is two, the two end head dismounting assemblies are respectively arranged on two adjustable bases, the lifting translation mechanism is arranged on the adjustable bases, in particular, the lifting translation mechanisms corresponding to the two end head dismounting assemblies are respectively arranged on the two adjustable bases, the lifting translation mechanism is in driving connection with the lifting plate 24, the end head dismounting mechanisms are arranged on the lifting plate 24, the height-adjustable positioning camera lens is provided with a vertical positioning scale 25 corresponding to the scale 405 of the positioning plate, Specifically, the height-adjustable positioning camera comprises a vertical telescopic seat 21 and a vertical positioning camera 22, 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, a remote control processing center is arranged on the adjustable moving base, the remote control processing center is respectively electrically connected with a base adjusting mechanism, a driving mechanism, a lifting mechanism, a horizontal positioning camera 15, a bolt dismounting assembly, a lifting translation mechanism, an end dismounting mechanism and the height-adjustable positioning camera, The remote control processing center is electrically connected with the horizontal positioning camera 15, the vertical positioning camera 22, the base adjusting cylinder 7 and the driving motor 9 respectively, and specifically, the remote control processing center comprises a processing module 41 and a wireless transfer module 42, the wireless transfer module 42 is electrically connected with the processing module 41, the processing module 41 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, and specifically, the processing module 41 is electrically connected with the horizontal positioning camera 15, the vertical positioning camera 22, the lifting mechanism, the end dismounting mechanism and the height-adjustable positioning camera respectively, When the stress meter 1 to be replaced is required to be disassembled, the angle and the length of the telescopic plate are adjusted according to the specification of the stress meter 1, so that the bolt dismounting assembly is positioned below the stress meter 1 to be written, and is mutually aligned with the stress meter bolt 102 corresponding to the stress meter 1, the adjustable base is adjusted, when the bolt dismounting assembly is aligned with the stress meter bolt 102, the dismounting mechanism corresponds to the position of the connecting end head, the telescopic degree of the vertical telescopic seat 21 is adjusted according to the position of the scale 405 of the positioning plate, the size of the connecting end head and the diameter of the connecting cable 2, and when the dismounting mechanism just moves to the position of the connecting end head to dismount the connecting end head, The vertical positioning graduation 25 is aligned with the positioning plate graduation 405, then the driving mechanism is installed, the driving gear 10 is inserted into the U-shaped structure of the track 5, so that the driving gear 10 is meshed with the rack 501, the driving motor 9 drives the adjustable movable base to move to the position of the stress meter 1 to be disassembled, then under the action of the horizontal positioning camera 15, the horizontal positioning graduation 1501 and the stress meter center graduation 101 are matched, the driving motor 9 drives the middle part 6 to adjust the front and back positions, the base adjusting cylinder 7 drives the middle part 6 to adjust the left and right positions until the horizontal positioning graduation 1501 is aligned with the stress meter center graduation 101, When the horizontal positioning scale 1501 is aligned with the center scale 101 of the stress meter, the lifting and translating mechanism drives the lifting plate 24 to move upwards, under the action of the vertical positioning camera 22, the lifting and translating mechanism is matched with the vertical positioning scale 25 and the positioning plate scale 405, and adjusts the position of the vertical positioning camera 22 until the vertical positioning scale 25 is aligned with the positioning plate scale 405, and at the moment, the dismounting mechanism just moves to the position of the connecting end part of the connecting cable 2 for dismounting the connecting end part.

Referring to fig. 1-5, 10 and 13, the lifting mechanism comprises a middle lifting cylinder 11, the middle lifting cylinder 11 is arranged on the middle part 6, and is preferential, the middle lifting cylinder 11 is positioned at the center of the middle part 6, the output end of the middle lifting cylinder 11 is connected with the 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, and is preferential, the bearing pressure sensor 13 is positioned at the center of the lifting base plate 12, the bearing plate 14 is arranged at the sensing end of the bearing pressure sensor 13, and is preferential, the bearing plate 14 is of a rectangular structure, the center of the bearing plate 14 coincides with the center of the lifting base plate 12, the bearing seat 20 is arranged on the bearing plate 14 and is used for bearing the strain gauge 1, the horizontal positioning camera 15 is arranged on the bearing plate 14, and is preferential, the horizontal positioning scale center coincides with the center of the bearing plate 14, the bearing pressure sensor 20 is arranged on the bearing seat 13, and is in a symmetrical mode, and the bearing plate 11 is driven by the bearing pressure gauge seat 13 to move to the middle lifting base plate 11, and the bearing plate 11 is gradually connected with the middle lifting base plate 11, and the middle lifting base plate 11 is driven to the middle lifting base plate 11, and the middle lifting base plate is gradually connected with the middle lifting base plate 11, and the middle lifting base plate is driven to the middle lifting base plate 11 to be electrically connected with the middle lifting base plate 11, and the middle lifting base plate is electrically connected with the middle lifting base plate 11, and the middle lifting base plate is electrically connected with the middle lifting base plate and the middle lifting base.

Referring to fig. 1-5, 11, and 17, the adjustable angle expansion plate includes an expansion plate bolt 16, a rotating arm 17, a bearing plate 33, and a rotating arm fastening bolt 1701, where the expansion plate bolt 16 passes through the rotating arm 17 and is rotationally connected with the rotating arm 17, the expansion plate bolt 16 passes through an end portion of the rotating arm 17 and is in threaded connection with the lifting base plate 12, the bearing plate 33 is connected with a bearing insert plate 32, the bearing insert plate 32 is inserted into the rotating arm 17 and is slidably connected with the rotating arm 17, the rotating arm fastening bolt 1701 is in threaded connection with the rotating arm 17 and extends into the rotating arm 17 to abut against the bearing insert plate 32, when the angle and the length of the adjustable angle expansion plate are adjusted, according to the specification of the strain gauge 1, the angle of the rotating arm 17 is adjusted, the rotating arm 17 is screwed down, the rotating plate bolt 16 is screwed down so that the angle of the rotating arm 17 is fixed, then the rotating arm fastening bolt 1701 is unscrewed, the distance between the rotating arm 17 and the bearing plate 33 is adjusted, when the distance is adjusted properly, the rotating arm fastening bolt 1 is screwed down, the rotating arm fastening bolt 1701 is screwed down, the rotating arm is positioned closer to the lifting base plate is positioned to the reference position of the lifting base plate, and the adjustable angle is preferably fixed, and the position of the bearing plate 1701 is located at the position is closer to the reference position.

Referring to fig. 1-5, 11, 17, the bolt dismounting assembly comprises a bolt dismounting lifting cylinder 34, the bolt dismounting lifting cylinder 34 is arranged on a bearing plate 33, the output end of the bolt dismounting lifting cylinder 34 is connected with a bolt pressure sensor 35, a bolt dismounting motor 36 is arranged on the sensing end of the bolt pressure sensor 35, the output end of the bolt dismounting motor 36 is connected with a limit inserting seat 37, a magnetic bolt sleeve head 38 is detachably arranged in the limit inserting seat 37, the bolt dismounting lifting cylinder 34, the bolt pressure sensor 35 and the bolt dismounting motor 36 are electrically connected with a remote control processing center, in particular, the bolt dismounting lifting cylinder 34, the bolt pressure sensor 35 and the bolt dismounting motor 36 are electrically connected with a processing module 41, the bearing height of the bearing seat 20 in the initial state is higher than the bearing height of the magnetic bolt sleeve head 38, when the bearing seat 20 bears the stress meter 1, the bolt dismounting lifting cylinder 34 drives the magnetic bolt sleeve head 38 to move upwards to sleeve the stress meter bolt 102, when the bolt pressure sensor 35 senses that the bearing pressure is gradually increased, the bolt dismounting lifting cylinder 34 pauses, then the bolt dismounting motor 36 starts to work, the stress meter bolt 102 is dismounted by the magnetic bolt sleeve head 38, in the dismounting process, the bolt dismounting lifting cylinder 34 drives the magnetic bolt sleeve head 38 to gradually move downwards to adapt to the dismounting of the stress meter bolt 102, after the dismounting of the stress meter bolt 102 is completed, the bolt dismounting lifting cylinder 34 continues to drive the magnetic bolt sleeve head 38 to move downwards, the bolt dismounting motor 36 stops working, because the magnetic bolt sleeve head 38 and the limiting insertion seat 37 are in a dismountable connection mode, the replacement is convenient according to the specification of the specific stress meter bolt 102, the detachable connection mode adopts a bolt mode and can also adopt a clamping mode.

Referring to fig. 1-4 and 14, the adjustable base includes an adjustable base seat 18, an adjustable base seat insertion plate 19 and a seat body fastening bolt 1801, the adjustable base seat 18 is disposed on the middle portion 6 and is located at two sides of the lifting base plate 12, the adjustable base seat insertion plate 19 is inserted into the adjustable base seat 18 and is slidably connected with the adjustable base seat 18, the seat body fastening bolt 1801 is screwed onto the adjustable base seat 18 and extends into the adjustable base seat 18 to abut against the adjustable base seat insertion plate 19, when the adjustable base seat is adjusted, the seat body fastening bolt 1801 is unscrewed according to the position of the connecting end portion, then the insertion degree of the adjustable base seat insertion plate 19 is adjusted, and then the adjustment of the adjustable base seat can be completed by screwing the seat body fastening bolt 1801.

Referring to fig. 1-5, 7-9, 12 and 14, the lifting and translating mechanism comprises a head lifting cylinder 23 and a translating guide rail 40, the head lifting cylinder 23 is arranged on the adjustable base inserting plate 19, the output end of the head lifting cylinder 23 is provided with a translating linear motor 39, the translating guide rail 40 is arranged on the bottom surface of the lifting plate 24, the translating linear motor 39 is in driving connection with the translating guide rail 40, the translating linear motor 39 and the translating guide rail 40 are electrically connected with a remote control processing center, specifically, the translating linear motor 39 and the translating guide rail 40 are electrically connected with a processing module 41, and the head dismounting mechanism comprises a head dismounting motor 26, The number of the side plates 28 and the end clamping cylinders 29 is two, the end disassembling motor 26 is arranged on the lifting plate 24, the output end of the end disassembling motor 26 is connected with the end disassembling gear 27, the side plates 28 are arranged on the lifting plate 24 and positioned on two sides of the end disassembling gear 27, the end clamping cylinders 29 are arranged on the side plates 28, the output end of the end clamping cylinders 29 is connected with the end clamping plate 30, a plurality of end clamping rotating rollers 31 are rotationally connected on the end clamping plate 30, the end disassembling motor 26 and the end clamping cylinders 29 are electrically connected with a remote control processing center, specifically, the end mounting and dismounting motor 26 and the end clamping cylinder 29 are electrically connected with the processing module 41, the fixed end part comprises a fixed cable connector 402, the fixed cable connector 402 is arranged at the end part 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 with a cable inside the fixed cable 4 to ensure the transmission of photoelectric signals, the connecting end part 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 part of the connecting cable 2, Specifically, the connection cable 2 is a flexible cable, the connection cable core 202 is located in the connection cable 2, and the end portion of the connection cable core extends out of the connection cable 2, wherein the connection cable core 202 is connected with a cable inside the connection cable 2 to ensure transmission of photoelectric signals, the rotating ring 3 is sleeved outside the bearing 201 and rotationally connected with the bearing 201, the outer periphery of the rotating ring 3 is provided with a toothed ring 301, the toothed ring 301 can be meshed with the 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 connection cable 2 and sleeved on the outer periphery of the connection cable core 202, The area of the connecting cable core 202 corresponds to that of the fixed cable core 403, when the connecting end head is connected with the fixing end head, the rotating ring 3 is connected with the fixing cable connector 402 through threads to realize the connection and the installation of the connecting end head and the fixing end head, at the moment, the fixed cable core 403 is attached to the connecting cable core 202, meanwhile, the rubber sleeve 203 protects the attaching part of the fixed cable core 403 and the connecting cable core 202, corrosion of water is reduced, when the connecting cable core is detached, the lifting plate 24 is driven to move upwards under the action of the end lifting cylinder 23, after the vertical positioning scale 25 is aligned with the positioning plate scale 405, At this time, the end dismounting gear 27 is meshed with the toothed ring 301, the end clamping cylinder 29 works to drive the end clamping plate 30 to clamp the rotating ring 3 and the toothed ring 301 through the end clamping rotating roller 31, then the end dismounting motor 26 works to drive the end dismounting gear 27 to rotate, in the process of rotating the end dismounting gear 27, the translation linear motor 39 starts to work to drive the lifting plate 24 to move away from the fixed cable 4, along with the moving and the rotation of the end dismounting gear 27, the rotating ring 3 can be dismounted on the fixed cable connector 402, after the dismounting is completed, the end lifting cylinder 23 drives the lifting plate 24 to move downwards, the fixed cable 4 can be used for transmitting photoelectric signals between the strain gages 1 with different linear layouts, and can also be directly connected with external acquisition equipment so as to receive the photoelectric signals.

1-8, 10, 11, 13 And 14, when the replaced strain gauge 1 is installed, the strain gauge 1 is placed on the bearing bracket 20, the strain gauge bolt 102 is placed in the magnetic attraction bolt sleeve head 38, the rotating ring 3 is placed in the end clamping plate 30 and clamped by the end clamping rotating roller 31, then the driving mechanism is installed in the track 5, the dismounting path returns, and then the installation can be performed, and as the strain gauge bolt 102 is drilled on the bottom surface of the bridge to form a hole slot when the strain gauge 1 is installed for the first time, only the hole slot corresponds to the position of the strain gauge bolt 102 when the dismounted strain gauge bolt 102 is installed, and re-drilling is not needed.

Referring to fig. 1-5, in the dismounting process, since the specification and the corresponding position of the strain gauge are already known when the strain gauge 1 is first installed, when the strain gauge 1 fails or needs to be overhauled, the specific position of the strain gauge 1to be dismounted can be known, the dismounting work can be completed by programming the processing module 41 in the remote control processing center, or the dismounting work can be completed by wireless signal interaction between the wireless transfer module 42 and an external remote control device and by means of the wireless transfer module and the processing module.

Working principle: when dismantling, according to the specification of the stress meter 1 that needs to dismantle, adjustable expansion plate of angle and adjustable base, according to the position of locating plate scale 405, adjust vertical location camera 22's height, afterwards install actuating mechanism in track 5, afterwards under actuating mechanism's effect, drive intermediate part 6 and remove to stress meter 1 position department, carry out the acquisition of horizontal position with the help of horizontal location camera 15, adjust intermediate part 6's horizontal position through base guiding mechanism and actuating mechanism, then carry out the bearing with the help of socket 20 to stress meter 1, carry out the dismantlement of stress meter bolt 102 with the help of the bolt dismouting subassembly, with the help of the acquisition of the vertical position of vertical location camera 22 memory, under the effect of lift translation mechanism, make dismouting mechanism remove to link head department, accomplish the dismantlement of link head with the cooperation of dismouting mechanism, after the completion of whole dismantlement, under actuating mechanism's effect, intermediate part 6 removes to staff's position department, then take off actuating mechanism from track 5, thereby conveniently take off stress meter 1, when carrying out the installation of stress meter 1, in the stress meter 1 and the end is followed in the installation path with the installation of stress meter 1, place in the link part and install the drive part, the stress meter is followed in the installation path is installed to the end, and the process is dismantled, the concrete, can be followed.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

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.