Hoisting device and method for demolition and reconstruction construction of superstructure of old bridge in water

Abstract

The invention relates to the technical field of hoisting equipment, in particular to a hoisting device and method for demolition and reconstruction construction of an upper structure of an old bridge in water. A hoisting device for dismantling and rebuilding an upper structure of an old bridge in water comprises a screw rod, a third fixing block, a sleeve and an arc-shaped rod. The side faces of the first fixing block and the adjacent second fixing block make contact with each other, and the side faces of the adjacent second fixing blocks make contact with each other. The contact surfaces of the fixed block I and the fixed block II are inclined surfaces; the contact surfaces of the two adjacent fixing blocks are inclined surfaces; when the bridge plate is guided through the inclined surface on the second fixing block, the bridge plate is automatically separated from the adjacent bridge plate, so that the resistance in the hoisting process is reduced, and compared with the mode that the adjacent bridge plate is manually separated through a crowbar, the mode can be automatically carried out along with hoisting operation of the first bridge plate, manual intervention is not needed, and the hoisting efficiency is improved. And the problem that accident risks are increased due to short-distance operation of workers is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of hoisting equipment. More specifically, the present invention relates to a hoisting device and method for the dismantling and reconstruction of the upper structure of an old bridge in water construction. Background Art

[0002] In the dismantling and reconstruction of bridge slabs of old bridges, it is usually necessary to manually operate a drilling machine to drill through holes in the bridge slabs, and then pass a locking device through the through holes and fix it on the bridge slabs. Then, connect the lifting tool of the crane to the locking device, and use the crane to lift the bridge slab from the bridge pier. However, when the crane lifts the bridge slab upward, the side surface of the bridge slab will have sliding friction with the side surface of the adjacent bridge slab. Since the side surfaces of the bridge slabs are usually uneven, and some side surfaces of the bridge slabs may also protrude steel bar heads, this will cause greater resistance and interference during the lifting process.

[0003] To solve this problem, it is usually necessary for workers to approach the bridge slab being lifted and use a crowbar to apply force to separate it from the adjacent bridge slab, thereby significantly reducing resistance and interference. However, this approach poses a great safety hazard because the bridge slab during the hoisting process is very unstable, and the close operation of workers increases the risk of accidents. Summary of the Invention

[0004] In order to overcome the disadvantages that the bridge slab is unstable during hoisting, and the operation of workers using a crowbar at close range to separate the adjacent bridge slabs increases the risk of accidents and poses a safety hazard, the present invention provides a hoisting device and method for the dismantling and reconstruction of the upper structure of an old bridge in water construction.

[0005] The technical implementation plan of the present invention is as follows: A hoisting device for the demolition and reconstruction construction of the superstructure of an old bridge in water, comprising a crane, a first fixing block and a second fixing block; there are at least two first fixing blocks; several second fixing blocks are arranged in a linear arrangement on the side of each first fixing block; it also includes a screw rod, a third fixing block, a sleeve and an arc-shaped rod; the side of the first fixing block is in contact with the side of the adjacent second fixing block, and the sides of the adjacent second fixing blocks are in contact with each other; the contact surfaces between the first fixing block and the second fixing block are both set as inclined surfaces; the contact surfaces between the adjacent second fixing blocks are both set as inclined surfaces; the lower end of the inclined surface of the second fixing block facing the first fixing block inclines inwards, and the lower end of the inclined surface of the second fixing block away from the first fixing block inclines outwards; at least two screw rods are penetrated through each first fixing block; at least two screw rods are also penetrated through each second fixing block; two screw rods located on the same first fixing block are jointly fixed to a third fixing block; two screw rods located on the same second fixing block are jointly fixed to another third fixing block; all the third fixing blocks are located below the corresponding first fixing blocks and second fixing blocks; a sleeve is screwed on each screw rod; at least two arc-shaped rods are fixed to each first fixing block; at least two arc-shaped rods are also fixed to each second fixing block.

[0006] Further, it also includes a buffer block; a buffer block is connected to each second fixing block, and the buffer block is arranged on the side of the second fixing block close to the first fixing block.

[0007] Further, it also includes a buffer assembly, and the buffer assembly includes a movable block, a round rod, a connecting block and a spring; the side surface of the buffer block is flush with the side surface of the corresponding second fixing block; a movable block is slidably connected to each second fixing block; several channels are opened on each movable block; a cavity one is opened in each second fixing block, and the movable block is located in the corresponding cavity one; damping oil is arranged in the cavity one; a round rod is fixed to each movable block, and the round rod is hermetically and slidably connected to the corresponding second fixing block; a connecting block is fixed to the end of each round rod, and the connecting block is slidably connected to the corresponding second fixing block; a cavity two is opened on each second fixing block, and the connecting block slides in the corresponding cavity two; a spring is sleeved on each round rod, one end of the spring is fixed to the corresponding connecting block, and the other end of the spring is fixed to the corresponding second fixing block; each connecting block is fixed to the corresponding buffer block.

[0008] Further, it also includes a stop block; a stop block is fixed to each connecting block, and the stop block slides on the corresponding second fixing block.

[0009] Further, it also includes an intercepting block; several intercepting blocks are fixed to each second fixing block, and the intercepting blocks penetrate through the corresponding connecting blocks.

[0010] Further, an opening is opened on each second fixing block, and the opening communicates with the corresponding cavity two.

[0011] Furthermore, the bottom of the second cavity slopes downward obliquely.

[0012] Furthermore, several flange parts are arranged on one side of each second fixing block away from the buffer block; several grooves are formed on one side of each second fixing block close to the buffer block; several flange parts are also arranged on the side of the first fixing block facing the second fixing block; the flange parts are inserted into the grooves.

[0013] Furthermore, the joint surfaces of the first fixing block and the second fixing block are all set as smooth surfaces.

[0014] A hoisting method for the demolition and reconstruction construction of the upper structure of an old bridge in water includes the following working steps: Step 1, drilling, using a drill to drill through holes in the bridge plate members. Step 2, locking, passing the screw upward through the through hole described in Step 1 and through the corresponding first fixing block or second fixing block, and then screwing the sleeve tightly on the screw. Step 3, fixing, connecting the arc-shaped rod with the crane through an external lifting tool. Step 4, hoisting, the crane hoists the bridge plate member through an external lifting tool. During the hoisting process of the bridge plate member, the second fixing block can guide the bridge plate member to separate it from the adjacent bridge plate member.

[0015] The beneficial effects of the present invention are as follows: 1. When guiding the bridge plate member through the inclined surface on the second fixing block, it automatically separates from the adjacent bridge plate member, thereby reducing the resistance during the hoisting process. Compared with manually using a crowbar to separate adjacent bridge plates, this method can be automatically carried out along with the hoisting operation of the first bridge plate member without manual intervention, avoiding the problem of increasing accident risks due to the close operation of workers. 2. While avoiding the reciprocating swing of the first bridge plate member through the buffer block and avoiding excessive impact between the first bridge plate member and the buffer block, it is beneficial to improve the hoisting stability and extend the service life of the lifting device. At the same time, the first cavity and the second cavity for realizing the buffer function are opened on the left inner side of the second fixing block to balance the gravity of the left and right parts of the second fixing block, which is beneficial to improving the stability of the hoisting process. 3. Through the cooperation of the stop block, the intercepting block and the opening, impurities are prevented from remaining inside the second cavity to interfere with the movement of the connecting block, thereby avoiding interference with the buffer operation of the bridge plate member. 4. Flange parts and grooves are arranged on the first fixing block and the second fixing block, so that all the second fixing blocks can be positioned through the first fixing block. After that, workers only need to determine the position where the through hole will be opened on the bridge plate member through the round hole on the second fixing block, without using measuring tools to determine the positions of other through holes manually, shortening the process steps and being beneficial to improving efficiency. Description of the Drawings

[0016] Figure 1 shows the structural schematic diagram of the hoisting device for the demolition and reconstruction construction of the superstructure of an old bridge in water according to the present invention; Figure 2 shows the installation state diagram of the first fixing block and the second fixing block according to the present invention; Figure 3 shows the sectional view of the hoisting device for the demolition and reconstruction construction of the superstructure of an old bridge in water according to the present invention; Figure 4 shows the structural schematic diagram of the buffer assembly according to the present invention; Figure 5 shows the structural schematic diagram of the intercepting block according to the present invention; Figure 6 shows the exploded view of the first fixing block and the second fixing block according to the present invention.

[0017] Explanation of reference numerals: 1 - crane, 2 - first fixing block, 3 - second fixing block, 4 - screw, 5 - third fixing block, 6 - sleeve, 7 - arc-shaped rod, 8 - bridge plate member, 201 - movable block, 202 - round rod, 203 - connecting block, 204 - spring, 205 - buffer block, 206 - stop block, 207 - intercepting block, 91 - first cavity, 92 - channel, 93 - second cavity, 94 - opening, 95 - flange portion, 96 - groove. Detailed implementation manners

[0018] The following is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention accordingly.

[0019] Embodiment 1 A hoisting device for the demolition and reconstruction construction of the superstructure of an old bridge in water, as Figures 1-6As shown in the figure, it includes a crane 1, a first fixing block 2 and a second fixing block 3. There are two first fixing blocks 2, and the first fixing blocks 2 are made of metal. Four second fixing blocks 3 are arranged in a linear pattern on the side of each first fixing block 2. It also includes a screw rod 4, a third fixing block 5, a sleeve 6 and an arc rod 7. The side surfaces of the first fixing block 2 and the adjacent second fixing block 3 are in contact with each other, and the side surfaces between adjacent second fixing blocks 3 are in contact with each other. The contact surfaces between the first fixing block 2 and the second fixing block 3 are all inclined surfaces. The contact surfaces between adjacent second fixing blocks 3 are all inclined surfaces. The lower end of the inclined surface on the side of the second fixing block 3 facing the first fixing block 2 inclines inward, and the lower end of the inclined surface on the side of the second fixing block 3 away from the first fixing block 2 inclines outward. Two screw rods 4 are inserted through each first fixing block 2. Two screw rods 4 are also inserted through each second fixing block 3. The two screw rods 4 located on the same first fixing block 2 are jointly fixed to a third fixing block 5. The two screw rods 4 located on the same second fixing block 3 are jointly fixed to another third fixing block 5. All the third fixing blocks 5 are located below the corresponding first fixing blocks 2 and second fixing blocks 3. A sleeve 6 is screwed onto each screw rod 4. Two arc rods 7 are welded to each first fixing block 2. Two arc rods 7 are also welded to each second fixing block 3, and the arc rods 7 are used for installing a lifting tool.

[0020] It also includes a buffer block 205. A buffer block 205 is connected to each second fixing block 3, and the swinging bridge plate 8 is buffered by the buffer block 205. The buffer block 205 is arranged on the side of the second fixing block 3 close to the first fixing block 2.

[0021] It also includes a buffer assembly. The buffer assembly includes a movable block 201, a round rod 202, a connecting block 203 and a spring 204. The side surface of the buffer block 205 is flush with the side surface of the corresponding second fixing block 3. A movable block 201 is slidably connected to each second fixing block 3. Four channels 92 are opened on each movable block 201. A cavity one 91 is opened in each second fixing block 3, and the movable block 201 is located in the corresponding cavity one 91. Damping oil is provided in the cavity one 91. A round rod 202 is bolted to each movable block 201. The round rod 202 is slidably connected to the corresponding second fixing block 3 in a sealed manner, and the round rod 202 is made of metal. A connecting block 203 is bolted to the end of each round rod 202. The connecting block 203 is slidably connected to the corresponding second fixing block 3. A cavity two 93 is opened in each second fixing block 3, and the connecting block 203 slides in the corresponding cavity two 93. A spring 204 is sleeved on each round rod 202. One end of the spring 204 is fixedly connected to the corresponding connecting block 203, and the other end of the spring 204 is fixedly connected to the corresponding second fixing block 3. Each connecting block 203 is bolted to the corresponding buffer block 205.

[0022] With Figure 1For example, the direction in which the fixed block 1-2 is close to the crane 1 is set as the left direction. Counting from left to right, the bridge plates 8 are sequentially set as the first bridge plate 8 to the fifth bridge plate 8: The following describes the hoisting work: First, manually use a drill to drill through holes in the bridge plate 8, then unscrew the sleeve 6 from the screw 4, and then remove the screw 4 and the fixed block 3-5 from the fixed block 1-2 or the fixed block 2-3. Then, arrange and place the fixed block 1-2 and the fixed block 2-3 on the bridge plate 8. At this time, the states of the fixed block 1-2 and the fixed block 2-3 are as Figure 2 shown, arranged in a straight line. Then, use a boom aerial work platform to lift another worker to the lower side of the bridge plate 8. This worker passes the screw 4 through the through hole in the bridge plate 8 from bottom to top, and makes the smooth rod part of the screw 4 pass through the fixed block 1-2 or the fixed block 2-3. At the same time, make the fixed block 3-5 abut against the lower side surface of the bridge plate 8. Then, the worker located on the upper side of the bridge plate 8 screws the sleeve 6 onto the screw 4 and presses the sleeve 6 against the fixed block 1-2 or the fixed block 2-3, so as to lock the fixed block 1-2, the fixed block 2-3, the screw 4, the fixed block 3-5, the sleeve 6 and the arc rod 7 on the bridge plate 8. At this time, the positional relationship between the fixed block 1-2, the fixed block 2-3, the screw 4, the fixed block 3-5, the sleeve 6, the arc rod 7 and the bridge plate 8 is as Figure 2 and Figure 3 shown. Then, manually fix the external lifting tool on the arc rod 7 corresponding to the first bridge plate 8, and then fix the external lifting tool on the hook of the crane 1. The crane 1 drives the arc rod 7 to move upward through the external lifting tool. The arc rod 7 drives the fixed block 1-2, the fixed block 2-3, the screw 4, the fixed block 3-5 and the sleeve 6 to move upward, so as to drive the first bridge plate 8 to move upward. The first bridge plate 8 moves upward and contacts the left inclined surface of the fixed block 2-3. The first bridge plate 8 is blocked and limited by the left inclined surface of the fixed block 2-3, so that the first bridge plate 8 moves obliquely upward along the left inclined surface of the fixed block 2-3, so that the first bridge plate 8 moves upward and away from the second bridge plate 8 at the same time. That is, during the upward movement of the first bridge plate 8, the collision between the concrete protrusions and the steel bar ends on the adjacent side surfaces of the first bridge plate 8 and the second bridge plate 8 can be reduced, and the resistance received by the first bridge plate 8 when it is lifted can be greatly reduced. Compared with manually using a crowbar to separate adjacent bridge plates, this method can be automatically carried out along with the lifting operation of the first bridge plate 8 without manual intervention, avoiding the problem of increasing the accident risk due to the close operation of workers.

[0023] The first bridge plate member 8 moves obliquely upward along the left side surface of the second fixed block 3. When it moves above the second fixed block 3, the second fixed block 3 no longer blocks and limits the first bridge plate member 8. At this time, the first bridge plate member 8 has the potential energy to swing to the right, resulting in left-right reciprocating swings with gradually decreasing amplitudes, leading to a decrease in the hoisting stability. Therefore, a buffer block 205 is provided on the second fixed block 3. In the initial state, the left side surface of the buffer block 205 is aligned with the right side surface of the corresponding bridge plate member 8. When the first bridge plate member 8 moves above the second fixed block 3, the second fixed block 3 no longer blocks and limits the first bridge plate member 8. At this time, the first bridge plate member 8 swings to the right and contacts the buffer block 205. The buffer block 205 intercepts the first bridge plate member 8, thus avoiding the reciprocating swing of the first bridge plate member 8.

[0024] The first bridge plate member 8 swings to the right and impacts the buffer block 205. Since the mass of the first bridge plate member 8 is relatively large, the impact force when it collides with the buffer block 205 is large, which not only reduces the service life of the buffer block 205 but also easily causes the hoisting stability to decrease instead of increase. Therefore, by making the left side surface of the buffer block 205 flush with the left side surface of the second fixed block 3, when the first bridge plate member 8 moves above the second fixed block 3, the first bridge plate member 8 transitions to contact the buffer block 205 and pushes the buffer block 205 to move to the right. The buffer block 205 drives the connecting block 203 to move to the right. The connecting block 203 drives the round rod 202 to move to the right and compresses the spring 204. The round rod 202 drives the movable block 201 to move to the right. During this process, the damping oil on the right side of the first cavity 91 is squeezed by the movable block 201 and will flow from the channel 92 to the left side of the first cavity 91. Since the channel 92 is relatively narrow, the damping oil will be subject to a relatively large resistance when passing through the channel 92, so that the movable block 201 moves to the right in a damped manner, and then the buffer block 205 moves to the right slowly, and then the first bridge plate member 8 swings to the right slowly. When the first bridge plate member 8 swings to the vertical state, the movable block 201 moves to the limit position, that is, the buffer block 205 cannot continue to move to the right. The buffer block 205 blocks and limits the first bridge plate member 8, so that the first bridge plate member 8 no longer swings to the right and loses the potential energy required for swinging. In this way, while avoiding the reciprocating swing of the first bridge plate member 8, it also avoids excessive impact between the first bridge plate member 8 and the buffer block 205, which is beneficial to improving the hoisting stability and the service life of the device.

[0025] During the hoisting process, in order to enable the second fixing block 3 to have the function of guiding the bridge plate member 8 obliquely upward, the overall shape of the second fixing block 3 is similar to a parallelogram. However, since the length of the lower side of the second fixing block 3 is equal to the width of the bridge plate member 8, and the upper left part of the second fixing block 3 extends beyond the upper side of the bridge plate member 8, while the upper right part of the second fixing block 3 is located inside the upper side of the bridge plate member 8, the center of gravity of the second fixing block 3 is shifted to the left. Therefore, the first cavity 91 and the second cavity 93 for realizing the buffering function are opened on the left inner side of the second fixing block 3 to balance the gravity of the left and right parts of the second fixing block 3, which is beneficial to improving the stability of the hoisting process.

[0026] In summary: When guiding the bridge plate member 8 through the inclined surface on the second fixing block 3, it can be automatically separated from the adjacent bridge plate member 8, thereby reducing the resistance during the hoisting process. Compared with manually using a crowbar to separate adjacent bridge plates, this method can be automatically carried out along with the hoisting operation of the first bridge plate member 8 without manual intervention, avoiding the problem of increasing the accident risk due to the close operation of workers; while the buffer block 205 can prevent the first bridge plate member 8 from swinging back and forth, and at the same time avoid excessive impact between the first bridge plate member 8 and the buffer block 205, which is beneficial to improving the hoisting stability and extending the service life of the lifting device. At the same time, the first cavity 91 and the second cavity 93 for realizing the buffering function are opened on the left inner side of the second fixing block 3 to balance the gravity of the left and right parts of the second fixing block 3, which is beneficial to improving the stability of the hoisting process.

[0027] Embodiment 2 On the basis of Embodiment 1, as Figure 5 shown, it further includes a stop block 206; a stop block 206 is bolted to each connecting block 203, and the stop block 206 slides on the corresponding second fixing block 3 to intercept impurities flowing towards the second cavity 93.

[0028] It further includes an interception block 207; three interception blocks 207 are bolted to each second fixing block 3, and the interception blocks 207 penetrate through the corresponding connecting blocks 203. The interception blocks 207 can be made of wear-resistant plastic or metal material to intercept large impurities flowing towards the second cavity 93.

[0029] An opening 94 is formed on each second fixing block 3, and the opening 94 communicates with the corresponding second cavity 93 to discharge the impurities in the second cavity 93.

[0030] The bottom of the second cavity 93 slopes downward obliquely to enable the impurities to be discharged smoothly through the opening 94.

[0031] When the bridge plate 8 pushes the buffer block 205 to move to the right, impurities (such as concrete debris) remaining on the bridge plate 8 will fall into the cavity two 93, interfering with the reset of the connecting block 203. Therefore, the stopper 206 intercepts the impurities to prevent them from falling to the right side of the connecting block 203. After the buffer block 205 drives the connecting block 203 to move to the right, the left side of the connecting block 203 stops contacting the fixed block two 3, and the impurities will fall to the left side of the connecting block 203. At this time, the large impurities can be intercepted by the intercepting block 207. After the small impurities fall to the left side of the connecting block 203, they will slide out from the opening 94, avoiding interference with the movement of the connecting block 203.

[0032] During use, the stopper 206, the intercepting block 207 and the opening 94 cooperate to prevent impurities from remaining inside the cavity two 93 and interfering with the movement of the connecting block 203, thereby avoiding interference with the buffering operation of the bridge plate 8.

[0033] Embodiment 3 On the basis of Embodiment 2, as Figure 6 shown, two flange portions 95 are provided on one side of each fixed block two 3 away from the buffer block 205; two grooves 96 are provided on one side of each fixed block two 3 close to the buffer block 205; two flange portions 95 are also provided on the side of the fixed block one 2 facing the fixed block two 3; the flange portions 95 are inserted into the grooves 96 to limit the fixed block one 2 and the fixed block two 3 in the left-right direction.

[0034] The joint surfaces of the fixed block one 2 and the fixed block two 3 are both set as smooth surfaces to reduce friction.

[0035] A chamfer is provided at the end of each screw 4 to make it easier for the screw 4 to pass through the fixed block one 2 and the fixed block two 3.

[0036] When manually using a drill to drill through holes in the bridge plate 8, first use a measuring tool to determine the opening positions of the two through holes on the left, then lock the fixed block one 2 on the bridge plate 8 through the two through holes on the left, and then insert the first fixed block two 3 obliquely downward into the fixed block one 2, so that the groove 96 of the first fixed block two 3 sleeves the outside of the flange portion 95 of the fixed block one 2, and then insert the second fixed block two 3 obliquely downward into the first fixed block two 3, so that the groove 96 of the second fixed block two 3 sleeves the outside of the flange portion 95 of the first fixed block two 3, and so on, insert the other fixed block two 3s in turn, so that the fixed block two 3s are arranged in a straight line on the bridge plate 8, thereby positioning all the fixed block two 3s through the fixed block one 2. Then, manually pass the drill bit of the drill through the round hole corresponding to the screw 4 on the fixed block two 3 to drill through holes in the bridge plate 8. During this process, the position where the through holes are to be opened on the bridge plate 8 can be positioned through the fixed block two 3, and there is no need to manually use a measuring tool to determine the opening positions of the other through holes, shortening the process steps and being beneficial to improving efficiency.

[0037] In use, a flange portion 95 and a groove 96 are provided on the first fixing block 2 and the second fixing block 3, so that all the second fixing blocks 3 can be positioned by the first fixing block 2. After that, an operator only needs to determine the positions of the through holes to be opened on the bridge plate member 8 through the round holes on the second fixing block 3, without using measuring tools to determine the opening positions of other through holes manually, which shortens the technological steps and is beneficial to improving efficiency.

[0038] A hoisting method for demolishing and reconstructing the upper structure of an old bridge in water includes the following working steps: Step 1, drilling: Use a drilling machine to drill through holes in the bridge plate member 8. Step 2, locking: Pass the screw rod 4 upward through the through hole described in Step 1 and through the corresponding first fixing block 2 or second fixing block 3, and then tighten the sleeve 6 on the screw rod 4. Step 3, fixing: Connect the arc-shaped rod 7 with the crane 1 through an external lifting tool. Step 4, hoisting: The crane 1 hoists the bridge plate member 8 through an external lifting tool. During the hoisting process of the bridge plate member 8, the second fixing block 3 can be used to guide the bridge plate member 8 to separate it from the adjacent bridge plate members 8.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes may be made therein without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A hoisting device for the demolition and reconstruction construction of the upper structure of an old bridge in water, comprising a crane (1); at least two fixing blocks one (2) are provided; a number of fixing blocks two (3) are arranged in a side-by-side manner on the side of each fixing block one (2) in a linear arrangement; characterized in that: The first fixing block (2) is in side contact with the adjacent second fixing block (3), and the sides of the adjacent second fixing blocks (3) are in contact with each other; the contact surfaces between the first fixing block (2) and the second fixing block (3) are all set as inclined surfaces; the contact surfaces between the adjacent second fixing blocks (3) are all set as inclined surfaces; the lower end of the inclined surface on the side of the second fixing block (3) facing the first fixing block (2) inclines inward, and the lower end of the inclined surface on the side of the second fixing block (3) away from the first fixing block (2) inclines outward; at least two screws (4) are inserted through each first fixing block (2); at least two screws (4) are also inserted through each second fixing block (3); two screws (4) located on the same first fixing block (2) are jointly fixed to a third fixing block (5); two screws (4) located on the same second fixing block (3) are jointly fixed to another third fixing block (5); all the third fixing blocks (5) are located below the corresponding first fixing blocks (2) and second fixing blocks (3); a sleeve (6) is screwed onto each screw (4); at least two arc-shaped rods (7) are fixed to each first fixing block (2); at least two arc-shaped rods (7) are also fixed to each second fixing block (3).

2. The hoisting device for the demolition and reconstruction construction of the upper structure of an old bridge in water according to claim 1, characterized in that: It further includes a buffer block (205); a buffer block (205) is connected to each second fixing block (3), and the buffer block (205) is arranged on the side of the second fixing block (3) close to the first fixing block (2).

3. A hoisting device for the demolition and reconstruction construction of the upper structure of an old bridge in water according to claim 2, characterized in that: It further includes a buffer assembly, and the buffer assembly includes a movable block (201), a round rod (202), a connecting block (203) and a spring (204); the side surface of the buffer block (205) is flush with the side surface of the corresponding second fixing block (3); a movable block (201) is slidably connected to each second fixing block (3); a plurality of channels (92) are formed in each movable block (201); a cavity one (91) is formed in each second fixing block (3), and the movable block (201) is located in the corresponding cavity one (91); damping oil is arranged in the cavity one (91); a round rod (202) is fixed to each movable block (201), and the round rod (202) is in sealed sliding connection with the corresponding second fixing block (3); a connecting block (203) is fixed to the end of each round rod (202), and the connecting block (203) is slidably connected to the corresponding second fixing block (3); a cavity two (93) is formed in each second fixing block (3), and the connecting block (203) slides in the corresponding cavity two (93); a spring (204) is sleeved on each round rod (202), one end of the spring (204) is fixed to the corresponding connecting block (203), and the other end of the spring (204) is fixed to the corresponding second fixing block (3); each connecting block (203) is fixed to the corresponding buffer block (205).

4. The hoisting device for the demolition and reconstruction construction of the upper structure of an old bridge in water according to claim 3, characterized in that: It further includes a stop block (206); a stop block (206) is fixed to each connecting block (203), and the stop block (206) slides on the corresponding second fixing block (3).

5. The hoisting device for the demolition and reconstruction construction of the upper structure of an old bridge in water according to claim 4, characterized in that: Further included is an interception block (207); a plurality of interception blocks (207) are fixedly connected to each second fixing block (3), and the interception block (207) penetrates through the corresponding connection block (203).

6. A hoisting device for the demolition and reconstruction construction of the upper structure of an old bridge in water according to claim 5, characterized in that: An opening (94) is formed in each second fixing block (3), and the opening (94) communicates with the corresponding second cavity (93).

7. A hoisting device for the demolition and reconstruction construction of the upper structure of an old bridge in water according to claim 6, characterized in that: The bottom of the second cavity (93) slopes obliquely downward.

8. A hoisting device for the demolition and reconstruction construction of the upper structure of an old bridge in water according to any one of claims 1-6, characterized in that: A plurality of flange portions (95) are provided on one side of each second fixing block (3) away from the buffer block (205); a plurality of grooves (96) are formed in one side of each second fixing block (3) close to the buffer block (205); a plurality of flange portions (95) are also provided on one side of the first fixing block (2) facing the second fixing block (3); the flange portions (95) are inserted into the grooves (96).

9. A hoisting device for the demolition and reconstruction construction of the upper structure of an old bridge in water according to claim 8, characterized in that: The joint surfaces of the first fixing block (2) and the second fixing block (3) are all set as smooth surfaces.

10. A hoisting method for the demolition and reconstruction construction of the superstructure of an old bridge in water, characterized in that, The method uses a hoisting device for demolishing and reconstructing the upper structure of an old bridge in water described in claim 9, and includes the following working steps: Step 1, drilling, using a drill to drill a through hole in the bridge plate member (8). Step 2, locking, passing the screw rod (4) upward through the through hole described in Step 1 and through the corresponding first fixing block (2) or second fixing block (3), and then tightening the sleeve (6) on the screw rod (4). Step 3, fixing, connecting the arc-shaped rod (7) with the crane (1) through an external lifting tool. Step 4, hoisting, the crane (1) hoists the bridge plate member (8) through an external lifting tool. During the hoisting process of the bridge plate member (8), the second fixing block (3) can be used to guide the bridge plate member (8) to separate it from the adjacent bridge plate member (8).

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