Bridge maintenance supporting structure and using method thereof

Abstract

The invention relates to the technical field of bridge maintenance supporting structures, in particular to a bridge maintenance supporting structure and a using method thereof. The problem that an existing bridge maintenance supporting structure is difficult to support a skew bridge floor is solved, and the practicability of equipment is improved. The device structurally comprises a fixed seat, a jacking plate is arranged on the fixed seat, a jacking mechanism used for controlling the jacking plate to ascend or descend is arranged between the fixed seat and the jacking plate, an abutting plate is arranged above the jacking plate, and a connecting mechanism used for enabling the abutting plate to be obliquely placed or horizontally placed at any angle relative to the jacking plate is arranged between the jacking plate and the abutting plate. The design that in the prior art, jacking is conducted directly through a telescopic rod is replaced, when an inclined bridge is supported, the contact area between the abutting plate and the bottom of the bridge is larger, supporting is more stable and reliable, and high practicability is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge maintenance support structures, and in particular to a bridge maintenance support structure and a use method thereof. Background Art

[0002] A bridge maintenance support structure is a structure used to temporarily support a bridge during its maintenance or repair. Its main function is to ensure that the bridge remains stable during the construction process to prevent it from collapsing or other safety issues.

[0003] The existing bridge maintenance support structure supports the bottom of the bridge through the telescopic movement of the telescopic rod, which is convenient for construction workers to repair the bridge.

[0004] Although this can achieve a supporting effect on the bridge during bridge maintenance, the following problems still exist: since the support is achieved by relying on the telescopic rod to move the support plate, the support plate is fixedly connected to the telescopic rod, and it is difficult for the support plate to change its inclination angle during the movement of the telescopic plate. When the support plate encounters the bottom of the bridge with an inclined support, the support plate cannot fully contact the bottom of the inclined bridge deck, which can easily cause the support structure to be unstable. Summary of the invention

[0005] The present invention provides a bridge maintenance support structure, which solves the problem that the existing bridge maintenance support structure is difficult to support the inclined bridge bottom surface, thereby improving the practicability of the equipment.

[0006] The technical solution of the present invention is as follows: A bridge maintenance support structure comprises a fixing seat, A lifting plate is provided on the fixed seat, a lifting mechanism for controlling the lifting plate to rise or fall is provided between the fixed seat and the lifting plate, an abutment plate is provided above the lifting plate, and a connecting mechanism for allowing the abutment plate to be tilted at any angle or horizontally placed relative to the lifting plate is provided between the lifting plate and the abutment plate.

[0007] Furthermore, the connecting mechanism includes a first sliding rod, a second sliding rod, a third sliding rod and a fourth sliding rod fixedly arranged at the lower end of the abutment plate; the first sliding rod, the second sliding rod, the third sliding rod and the fourth sliding rod are all slidingly connected to the lifting plate; a limiting spring is sleeved on the first sliding rod; both ends of each limiting spring are respectively fixedly connected to the lifting plate and the abutment plate; a limiting bolt is fixed at the end of the first sliding rod, and the limiting bolt abuts against the lifting plate.

[0008] Furthermore, the jacking mechanism includes a first jacking assembly arranged on one side of the lower end of the jacking plate, and a second jacking assembly arranged on the other side of the lower end of the jacking plate, the first jacking assembly includes a first jacking piece and a second jacking piece, the first jacking piece and the second jacking piece are arranged at both ends of the lower side of the jacking plate, and the first jacking piece and the second jacking piece are both abutted against the jacking plate, a screw rod is rotatably connected to the fixed seat, and the screw rod is sequentially provided with a first thread, a second thread, a third thread and a fourth thread, the first thread and the third thread have the same rotation direction, the second thread and the fourth thread have the same rotation direction, the first thread and the second thread have opposite rotation directions, and the first thread, the second thread, the third thread and the fourth thread have opposite rotation directions. The first connecting block, the second connecting block, the third connecting block and the fourth connecting block are respectively threadedly connected on the third thread and the fourth thread, a first connecting rod is provided between the first connecting block and the first lifting member, and a first connecting rod and a second connecting rod are also provided on the first lifting member, two ends of the first connecting rod are respectively rotatably connected to the first connecting block and the first lifting member, two ends of the second connecting rod are respectively rotatably connected to the second connecting block and the first lifting member, a third connecting rod and a fourth connecting rod are provided on the second lifting member, two ends of the third connecting rod are respectively rotatably connected to the third connecting block and the second lifting member, and two ends of the fourth connecting rod are respectively rotatably connected to the second lifting member and the fourth connecting block.

[0009] Furthermore, the cross-section of the first lifting member is a "冂"-shaped structure, a fifth connecting rod is fixed to the top of the first lifting member, a connecting ball is fixed to the top of the fifth connecting rod, a connecting member is fixed to the bottom of the lifting plate, the connecting member is a spherical structure, a connecting groove is provided in the connecting member, the connecting groove is a spherical structure, the connecting ball is arranged in the connecting groove and is rotatably connected to the connecting groove, the first lifting member and the second lifting member have the same structure, the first lifting assembly and the second lifting assembly have the same structure, and a synchronous belt is connected between the screw rod on the first lifting assembly and the screw rod on the second lifting assembly.

[0010] Furthermore, a first maintenance ladder and a second maintenance ladder are respectively provided on both sides of the fixed seat, a sliding rail is fixed in the fixed seat, a first sliding member is slidingly connected in the sliding rail, and both ends of the first maintenance ladder are rotatably connected to the first sliding member and the lifting plate respectively.

[0011] Furthermore, a sixth connecting rod is rotatably connected to both sides of the lower end of the first maintenance ladder, a first telescopic member is provided between the sixth connecting rod and the first maintenance ladder, the fixed end of the first telescopic member is rotatably connected to the sixth connecting rod, and the telescopic end of the first telescopic member is rotatably connected to the first maintenance ladder.

[0012] Further, a plurality of first ladder grooves and a plurality of second ladder grooves are respectively provided on both sides of the first maintenance ladder. The cross-sections of the first ladder grooves and the second ladder grooves are right-angled triangle structures. An escape opening is further provided at the upper end of the first maintenance ladder, and the escape opening is arranged between the first ladder grooves and the second ladder grooves.

[0013] Further, the sliding rail is also slidably connected with a second sliding member. An escape slideway is further provided on the escape opening, and both ends of the escape slideway are respectively rotatably connected with the escape opening and the second sliding member.

[0014] Further, a protection plate is fixed at the upper end of the escape opening. The projection plane of the escape opening in the vertical direction falls within the projection plane of the protection plate in the vertical direction. A buffer layer is fixed at the upper end of the second sliding member. The buffer layer is buffer sponge. The structures of the first maintenance ladder and the second maintenance ladder are the same. A plurality of moving wheels are further provided at the bottom of the fixed seat. A second telescopic member is further provided on the fixed seat. The fixed end of the second telescopic member is fixedly connected with the fixed seat, and the telescopic end of the second telescopic member is fixedly connected with a support foot.

[0015] Another object of the present invention is to provide a use method of a bridge maintenance support structure. S1: First, move the fixed seat to the lower part of the bridge to be maintained through the moving wheels. Start the second telescopic member so that the support frame replaces the moving wheels to contact the ground. Then start the synchronous belt to drive the screw rod to rotate. At this time, the first connecting block and the second connecting block approach each other, and the third connecting block and the fourth connecting block approach each other, driving the jacking plate to rise until the abutting plate completely abuts against the bottom of the bridge to be maintained. S2: Adjust the first telescopic member so that the maintenance ladder rotates to a suitable maintenance angle, and the maintenance personnel perform maintenance on the bottom of the bridge through the first ladder groove or the second ladder groove. S3: After the maintenance is completed, reverse-start the synchronous belt so that the abutting plate disengages from the bridge. Then start to contract the second telescopic member so that the moving wheels replace the support feet to contact the ground. Then move the fixed seat away from the bridge.

[0016] The working principle and beneficial effects of the present invention are as follows: In this embodiment, a jacking plate is provided on the fixed seat, and an abutting plate is provided on the jacking plate. The abutting plate is abutted and supported on the bridge through the jacking mechanism, and the angle between the abutting plate and the jacking plate is adjustable through the connecting mechanism, replacing the design of directly jacking through the telescopic rod in the prior art. When the present invention supports an inclined bridge, the abutting plate has a larger contact area with the bottom of the bridge, and the support is more stable and reliable, with strong practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0018] Figure 1 is a structural schematic diagram of the prior art; Figure 2 is the overall structural schematic of this embodiment Figure 1 ; Figure 3 is the overall structural schematic of this embodiment Figure 2 ; Figure 4 is the internal structural schematic of this embodiment Figure 1 ; Figure 5 is the connection structure schematic of the first maintenance ladder in this embodiment Figure 1 ; Figure 6 is the internal structural schematic of this embodiment Figure 2 ; Figure 7 is the connection structure schematic of the first maintenance ladder in this embodiment Figure 2 .

[0019] In the figure: 1. Fixed seat; 11. Support feet; 12. Screw rod; 121. First thread; 1211. First connection block; 122. Second thread; 1221. Second connection block; 123. Third thread; 1231. Third connection block; 124. Fourth thread; 1241. Fourth connection block; 13. Second telescopic member; 14. Synchronous belt; 2. Movable wheel; 3. Lifting plate; 31. Connecting member; 311. Connecting groove; 4. Abuttment plate; 41. First sliding rod; 411. Limit bolt; 412. Limit spring; 42. Second sliding rod; 43. Third sliding rod; 44. Fourth sliding rod; 51. First lifting member; 511. Fifth connecting rod; 512. Connecting ball; 52. First connecting rod; 53. Second connecting rod; 54. Third connecting rod; 55. Fourth connecting rod; 56. Second lifting member; 6. Sliding rail; 61. First sliding member; 62. Second sliding member; 71. First maintenance ladder; 711. First ladder groove; 712. Second ladder groove; 713. Escape opening; 714. Protection plate; 715. Sixth connecting rod; 7151. First telescopic member; 72. Second maintenance ladder; 8. Escape slideway. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present invention.

[0021] As Figures 2 to 7As shown, this embodiment proposes a bridge maintenance support structure, the structure of which includes a fixed seat 1. The jacking plate 3 in this embodiment is arranged on the fixed seat 1 to realize the jacking support for the bridge. The jacking mechanism is arranged between the fixed seat 1 and the jacking plate 3 to control the rising or falling of the jacking plate 3. The abutting plate 4 is arranged above the jacking plate 3 to abut against the bridge. The connecting mechanism is arranged between the jacking plate 3 and the abutting plate 4 to make the abutting plate 4 be placed obliquely or horizontally relative to the jacking plate 3 at any angle.

[0022] The connecting mechanism in this embodiment includes a first sliding rod 41, a second sliding rod 42, a third sliding rod 43 and a fourth sliding rod 44 fixedly arranged at the lower end of the abutting plate 4. The first sliding rod 41, the second sliding rod 42, the third sliding rod 43 and the fourth sliding rod 44 are all slidably connected to the jacking plate 3. The limiting spring 412 is sleeved on the first sliding rod 41, and both ends of each limiting spring 412 are fixedly connected to the jacking plate 3 and the abutting plate 4 respectively, to leave a gap between the abutting plate 4 and the jacking plate 3, so that the abutting plate 4 can be placed obliquely relative to the jacking plate 3. The limiting bolt 411 is fixedly arranged at the end of the first sliding rod 41, and the limiting bolt 411 abuts against the jacking plate 3 to prevent the first sliding rod 41, the second sliding rod 42, the third sliding rod 43 and the fourth sliding rod 44 from detaching from the jacking plate 3. Such a design enables that when the abutting plate 4 abuts against the bottom of the bridge to be maintained, under the action of the limiting spring 412, the jacking plate 3 can fit with the bottom of the bridge according to the specific inclination of the contact with the bottom of the bridge, increasing the contact area with the inclined bridge and making the support effect on the bridge more stable and reliable.

[0023] The jacking mechanism in this embodiment includes a first jacking component disposed on one side of the lower end of the jacking plate 3 and a second jacking component disposed on the other side of the lower end of the jacking plate 3. The first jacking component includes a first jacking member 51 and a second jacking member 56. The first jacking member 51 and the second jacking member 56 are disposed at both ends of the lower side of the jacking plate 3, and both the first jacking member 51 and the second jacking member 56 are in contact with the jacking plate 3. The lead screw 12 is rotatably disposed on the fixed seat 1. The lead screw 12 is successively provided with a first thread 121, a second thread 122, a third thread 123, and a fourth thread 124. The first thread 121 and the third thread 123 have the same helix direction, the second thread 122 and the fourth thread 124 have the same helix direction, and the first thread 121 and the second thread 122 have opposite helix directions. A first connecting block 1211, a second connecting block 1221, a third connecting block 1231, and a fourth connecting block 1241 are respectively threadedly connected to the first thread 121, the second thread 122, the third thread 123, and the fourth thread 124. A first connecting rod 52 is disposed between the first connecting block 1211 and the first jacking member 51. The first connecting rod 52 and the second connecting rod 53 are disposed on the first jacking member 51. Both ends of the first connecting rod 52 are rotatably connected to the first connecting block 1211 and the first jacking member 51 respectively. Both ends of the second connecting rod 53 are rotatably connected to the second connecting block 1221 and the first jacking member 51 respectively. The third connecting rod 54 and the fourth connecting rod 55 are disposed on the second jacking member 56. Both ends of the third connecting rod 54 are rotatably connected to the third connecting block 1231 and the second jacking member 56 respectively. Both ends of the fourth connecting rod 55 are rotatably connected to the second jacking member 56 and the fourth connecting block 1241 respectively. In this embodiment, the lead screw 12 is used to control the first jacking component and the second jacking component to perform jacking. Since the rotation stroke of the lead screw 12 is much larger than the rising or falling stroke of the first jacking member 51 and the second jacking member 56, controlling the first jacking component and the second jacking component to perform jacking by the lead screw 12 is more accurate and reliable. It not only prevents the contact between the abutting plate 4 and the bottom of the bridge from being too loose, resulting in a decrease in the supporting effect on the bridge, but also prevents the contact between the abutting plate 4 and the bottom of the bridge from being too tight, causing damage to the fixed seat 1.

[0024] The cross section of the first jacking member 51 in this embodiment is a "冂"-shaped structure, which is used to facilitate the connection between the jacking member and the first connecting rod 52 and the second connecting rod 53. The fifth connecting rod 511 is fixedly arranged on the top of the first jacking member 51, the connecting ball 512 is fixedly arranged on the top of the fifth connecting rod 511, the connecting member 31 is fixedly arranged on the bottom of the jacking plate 3, the connecting member 31 is a ball-shaped structure, the connecting groove 311 is arranged in the connecting member 31, the connecting groove 311 is a ball-shaped structure, the connecting ball 512 is arranged in the connecting groove 311 and is rotatably connected to the connecting groove 311, the first jacking member 51 and the second jacking member 56 have the same structure, the first jacking assembly and the second jacking assembly have the same structure, and the synchronous belt 14 is connected between the screw rod 12 on the first jacking assembly and the screw rod 12 on the second jacking assembly. This embodiment can synchronously control the rotation of the screw rod 12 of the first jacking component and the screw rod 12 on the second jacking component through the synchronous belt 14, which facilitates the synchronous jacking of the first jacking component and the second jacking component, and reduces the skew phenomenon of the jacking plate 3 caused by the separate control during the movement of the jacking plate 3. This embodiment adopts the connecting piece 31 and the connecting ball 512 to rotatably connect the first jacking piece 51 and the jacking plate 3, so that even if the jacking plate 3 is skewed during the jacking work, the connection between the first jacking piece 51 and the jacking plate 3 can be completed through the cooperation between the connecting ball 512 and the connecting groove 311. Improve the overall structural stability and reliability of the equipment. The connecting piece 31 used in this embodiment can be divided into two pieces. When installing, first separate the connecting blocks, then place the connecting ball 512 into the connecting groove 311, and then weld the connecting piece 31 into one piece by a welding machine.

[0025] In this embodiment, the first maintenance ladder 71 and the second maintenance ladder 72 are arranged on both sides of the fixed seat 1, the sliding rail 6 is fixedly arranged in the fixed seat 1, the first sliding member 61 is slidingly arranged in the sliding rail 6, and the two ends of the first maintenance ladder 71 are respectively rotatably connected with the first sliding member 61 and the lifting plate 3. Such a design enables the other end of the first maintenance ladder 71 and the other end of the second maintenance ladder 72 to slide in the sliding groove when the lifting plate 3 is lifted, so that the first maintenance ladder 71 and the second maintenance ladder 72 can quickly reach the top of the bridge according to the lifting condition of the lifting plate 3, so as to facilitate the maintenance of the bottom of the bridge.

[0026] In this embodiment, the sixth connecting rod 715 is rotatably arranged on both sides of the lower end of the first maintenance ladder 71. The first telescopic member 7151 is arranged between the sixth connecting rod 715 and the first maintenance ladder 71. The fixed end of the first telescopic member 7151 is rotatably connected to the sixth connecting rod 715, and the telescopic end of the first telescopic member 7151 is rotatably connected to the first maintenance ladder 71. The first telescopic member 7151 adopted in this embodiment is preferably a hydraulic cylinder or a pneumatic cylinder. Among them, both the hydraulic cylinder and the pneumatic cylinder are prior arts, and will not be elaborated in this embodiment. In this embodiment, the rotation of the first maintenance ladder 71 relative to the sixth connecting rod 715 is controlled by the telescoping of the first telescopic member 7151, which facilitates the maintenance of the bottom position of the bridge near the jacking plate 3.

[0027] In this embodiment, several first ladder grooves 711 and several second ladder grooves 712 are respectively arranged on both sides of the first maintenance ladder 71. The cross-sections of the first ladder grooves 711 and the second ladder grooves 712 are right-angled triangle structures, which are used to facilitate the climbing of maintenance personnel. The escape opening 713 is arranged at the upper end of the first maintenance ladder 71, and the escape opening 713 is arranged between the first ladder grooves 711 and the second ladder grooves 712. The several first ladder grooves 711 and several second ladder grooves 712 adopted in this embodiment facilitate the climbing and maintenance of maintenance personnel. The escape opening 713 adopted in this embodiment is for the maintenance personnel to escape through the escape opening 713 when an accidental collapse occurs to the bridge.

[0028] In this embodiment, the second sliding member 62 is slidably arranged on the sliding rail 6. The escape slideway 8 is arranged on the escape opening 713. Both ends of the escape slideway 8 are rotatably connected to the escape opening 713 and the second sliding member 62 respectively. Such a design enables the escape slideway 8 to slide driven by the jacking plate 3 during the jacking process, so that a triangular support is formed between the escape slideway 8 and the fixed seat 1 of the first maintenance ladder 71, making the placement of the first maintenance ladder 71 more stable and reliable.

[0029] In this embodiment, the protection plate 714 is fixedly arranged at the upper end of the escape opening 713. The projection plane of the escape opening 713 in the vertical direction falls within the projection plane of the protection plate 714 in the vertical direction, which is used to prevent stones generated by the collapse of the bridge from falling into the escape opening 713 and causing harm to maintenance personnel when the bridge collapses. The buffer layer is fixedly arranged at the upper end of the second sliding member 62. The buffer layer is a buffer sponge, which is used to reduce the harm to the body caused by the contact with the ground when maintenance personnel escape from the escape slideway 8. The structures of the first maintenance ladder 71 and the second maintenance ladder 72 are the same. A plurality of moving wheels 2 are arranged at the bottom of the fixed seat 1, which is used to facilitate the movement of the fixed seat 1. The second telescopic member 13 is arranged on the fixed seat 1. The fixed end of the second telescopic member 13 is fixedly connected to the fixed seat 1. The support feet 11 are fixedly arranged at the telescopic end of the second telescopic member 13, which is used to position the fixed seat 1 and reduce the phenomenon that the fixed seat 1 and the ground deviate and slip during the lifting process of the lifting plate 3. In this embodiment, an anti-slip layer is arranged at the bottom of the support feet 11, and the anti-slip layer is made of rubber material. The second telescopic member 13 adopted in this embodiment is preferably a hydraulic cylinder or a pneumatic cylinder. Among them, both the hydraulic cylinder and the pneumatic cylinder are prior arts, and this embodiment will not elaborate.

[0030] Another object of the present invention is to provide a usage method of a bridge maintenance support structure. S1: First, move the fixed seat 1 to the lower part of the bridge to be maintained through the moving wheels 2, start the second telescopic member 13 to make the support frame contact the ground instead of the moving wheels 2, and then start the synchronous belt 14 to drive the lead screw 12 to rotate. At this time, the first connecting block 1211 and the second connecting block 1221 approach each other, and the third connecting block 1231 and the fourth connecting block 1241 approach each other, driving the lifting plate 3 to rise until the abutting plate 4 completely abuts against the bottom of the bridge to be maintained. In this embodiment, according to the actual situation of the bottom of the bridge, the contact between the abutting plate 4 and the bottom of the bridge can be controlled, so that the abutting plate 4 is placed obliquely relative to the bridge. Ensure that even if the bottom of the bridge to be detected is inclined, the bridge can be supported.

[0031] S2: Adjust the first telescopic member 7151 to rotate the maintenance ladder to a suitable maintenance angle, and the maintenance personnel repair the bottom of the bridge through the first ladder groove 711 or the second ladder groove 712. The maintenance ladder can control the distance between the maintenance ladder and the lifting plate 3 according to the telescopic situation of the first telescopic member 7151, and expand the maintenance range of the maintenance ladder for the bottom of the bridge.

[0032] S3: After the repair is completed, reverse-start the synchronous belt 14 to make the abutting plate 4 disengage from the bridge, then start to contract the second telescopic member 13 to make the moving wheel 2 contact the ground instead of the support foot 11, and then move the fixed seat 1 away from the bridge. When the support foot 11 contracts through the second telescopic member 13 so that the support foot 11 disengages from the ground and the moving wheel 2 contacts the ground, the fixed frame can move through the moving wheel 2. Such a design not only enables the support structure to move conveniently, but also after it moves to a suitable position, it is fixed to the ground through the support foot 11, which is convenient for supporting the bottom of the bridge.

[0033] Working process of this embodiment: First, move the fixed seat 1 under the bridge to be repaired through the moving wheel 2, start the second telescopic member 13 to make the support foot 11 contact the ground instead of the moving wheel 2, then start the synchronous belt 14, and drive the jacking plate 3 to rise through the rotation of the lead screw 12 until the abutting plate 4 abuts against the bridge. At this time, continue to raise the jacking plate 3, and under the action of the limiting spring 412, the abutting plate 4 completely abuts against the bridge deck. Then start the first telescopic member 7151 to make the first repair ladder 71 or the second repair ladder 72 rotate to the repair position, and the repair personnel carry out the repair through the first repair ladder 71 or the second repair ladder 72. When the repair is completed, reverse-start the synchronous belt 14 and contract the second telescopic member 13 to make the abutting plate 4 disengage from the bridge, and transport the fixed seat 1 away through the moving wheel 2.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bridge maintenance support structure, comprising a fixed seat (1), characterized in that a lifting plate (3) is provided on the fixed seat (1), a lifting mechanism for controlling the lifting or lowering of the lifting plate (3) is provided between the fixed seat (1) and the lifting plate (3), a contact plate (4) is provided above the lifting plate (3), and a connecting mechanism for making the contact plate (4) be placed obliquely or horizontally relative to the lifting plate (3) at any angle is provided between the lifting plate (3) and the contact plate (4).

2. The bridge maintenance support structure according to claim 1, characterized in that, The connecting mechanism includes a first sliding rod (41), a second sliding rod (42), a third sliding rod (43) and a fourth sliding rod (44) fixedly arranged at the lower end of the contact plate (4). The first sliding rod (41), the second sliding rod (42), the third sliding rod (43) and the fourth sliding rod (44) are all slidably connected with the lifting plate (3). A limiting spring (412) is sleeved on the first sliding rod (41). Two ends of each limiting spring (412) are fixedly connected with the lifting plate (3) and the contact plate (4) respectively. A limiting bolt (411) is fixed at the end of the first sliding rod (41), and the limiting bolt (411) abuts against the lifting plate (3).

3. A bridge maintenance support structure according to claim 1, characterized in that, The lifting mechanism comprises a first lifting assembly arranged on one side of the lower end of the lifting plate (3), and a second lifting assembly arranged on the other side of the lower end of the lifting plate (3), the first lifting assembly comprising a first lifting member (51) and a second lifting member (56), the first lifting member (51) and the second lifting member (56) being arranged at two ends of the lower side of the lifting plate (3), and the first lifting member (51) and the second lifting member (56) being in contact with the lifting plate (3), and the fixing seat (1) being rotatably connected to a screw rod (12) ), the screw rod (12) is provided with a first thread (121), a second thread (122), a third thread (123) and a fourth thread (124) in sequence, the first thread (121) and the third thread (123) have the same rotation direction, the second thread (122) and the fourth thread (124) have the same rotation direction, the first thread (121) and the second thread (122) have opposite rotation directions, the first thread (121), the second thread (122), the third thread (123) and the fourth thread (124) have opposite rotation directions, The first connecting block (1211), the second connecting block (1221), the third connecting block (1231) and the fourth connecting block (1241) are respectively threadedly connected thereto; a first connecting rod (52) is provided between the first connecting block (1211) and the first lifting member (51); the first lifting member (51) is also provided with a first connecting rod (52) and a second connecting rod (53); the two ends of the first connecting rod (52) are respectively connected to the first connecting block (1211) and the first lifting member (51); 1) rotationally connected, the two ends of the second connecting rod (53) are rotationally connected to the second connecting block (1221) and the first lifting member (51), the second lifting member (56) is provided with a third connecting rod (54) and a fourth connecting rod (55), the two ends of the third connecting rod (54) are rotationally connected to the third connecting block (1231) and the second lifting member (56), and the two ends of the fourth connecting rod (55) are rotationally connected to the second lifting member (56) and the fourth connecting block (1241).

4. A bridge maintenance support structure according to claim 2, characterized in that, The cross section of the first lifting member (51) is a "冂"-shaped structure. A fifth connecting rod (511) is fixed to the top of the first lifting member (51). A connecting ball (512) is fixed to the top of the fifth connecting rod (511). A connecting member (31) is fixed to the bottom of the lifting plate (3). The connecting member (31) is a ball-shaped structure. A connecting groove (311) is provided in the connecting member (31). The connecting groove (311) is a ball-shaped structure. The connecting ball (512) is arranged in the connecting groove (311) and is rotatably connected to the connecting groove (311). The first lifting member (51) and the second lifting member (56) have the same structure. The first lifting assembly and the second lifting assembly have the same structure. A synchronous belt (14) is connected between the screw rod (12) on the first lifting assembly and the screw rod (12) on the second lifting assembly.

5. A bridge maintenance support structure according to claim 1, characterized in that, On both sides of the fixed seat (1), a first maintenance ladder (71) and a second maintenance ladder (72) are respectively provided. A sliding rail (6) is fixed inside the fixed seat (1). A first sliding member (61) is slidably connected inside the sliding rail (6). Both ends of the first maintenance ladder (71) are rotatably connected to the first sliding member (61) and the lifting plate (3).

6. The bridge maintenance support structure according to claim 5, wherein, On both sides of the lower end of the first maintenance ladder (71), sixth connecting rods (715) are rotatably connected. Between the sixth connecting rods (715) and the first maintenance ladder (71), first telescopic members (7151) are respectively provided. The fixed ends of the first telescopic members (7151) are rotatably connected to the fourth connecting rods (55). The telescopic ends of the first telescopic members (7151) are rotatably connected to the first maintenance ladder (71).

7. A bridge maintenance support structure according to claim 6, characterized in that, On both sides of the first maintenance ladder (71), a plurality of first ladder grooves (711) and a plurality of second ladder grooves (712) are respectively provided. The cross-sections of the first ladder grooves (711) and the second ladder grooves (712) are right-angled triangle structures. An escape opening (713) is further provided at the upper end of the first maintenance ladder (71). The escape opening (713) is arranged between the first ladder grooves (711) and the second ladder grooves (712).

8. A bridge maintenance support structure according to claim 7, characterized in that, A second sliding member (62) is further slidably connected to the sliding rail (6). An escape slideway (8) is further provided on the escape opening (713). Both ends of the escape slideway (8) are rotatably connected to the escape opening (713) and the second sliding member (62).

9. The bridge maintenance support structure according to claim 8, characterized in that, A protection plate (714) is further fixed at the upper end of the escape opening (713). The projection plane of the escape opening (713) in the vertical direction falls within the projection plane of the protection plate (714) in the vertical direction. A buffer layer is further fixed at the upper end of the second sliding member (62). The buffer layer is buffer sponge. The structures of the first maintenance ladder (71) and the second maintenance ladder (72) are the same. A plurality of moving wheels (2) are further provided at the bottom of the fixed seat. A second telescopic member (13) is further provided on the fixed seat. The fixed end of the second telescopic member (13) is fixedly connected to the fixed seat. The telescopic end of the second telescopic member (13) is fixedly connected with a support foot (11).

10. A method for using a bridge maintenance support structure according to any one of claims 1 to 9, characterized in that S1: First, move the fixed seat (1) to the lower part of the bridge to be maintained through the moving wheels (2). Start the second telescopic member (13) so that the support frame replaces the moving wheels (2) to contact the ground. Then start the synchronous belt (14) to drive the lead screw (12) to rotate. At this time, the first connecting block (1211) and the second connecting block (1221) approach each other, and the third connecting block (1231) and the fourth connecting block (1241) approach each other, driving the lifting plate (3) to rise until the abutting plate (4) completely abuts against the bottom of the bridge to be maintained; S2: Adjust the first telescopic member (7151) to rotate the maintenance ladder to a suitable maintenance angle. The maintenance personnel repair the bottom of the bridge through the first ladder grooves (711) or the second ladder grooves (712); S3: After the repair is completed, reverse-start the synchronous belt (14) so that the abutting plate (4) disengages from the bridge, then start to contract the second telescopic member (13) so that the moving wheels (2) contact the ground instead of the support feet (11), and then move the fixed seat (1) away from the bridge.

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