Steel box girder hoisting and installing device and method for cross-sea bridge

Abstract

The present application relates to the technical field of bridge, specifically relates to a kind of sea-crossing bridge steel box girder hoisting installation device and method, sea-crossing bridge steel box girder hoisting installation device includes installation component;Installation component includes top frame mechanism and two installation mechanisms;Installation mechanism includes support frame, two hangers, two limit posts, two butt blocks, two driving members, two insertion rods and two lifting pieces;When disassembling, lifting piece drives insertion rod to move up, is completely removed from first adaptive hole, driving member drives butt block to move towards the direction close to driving member, so that hanger is finally located in first adaptive hole, limit post is aligned with first adaptive hole, at this time, lower support frame, limit post can pass through first adaptive hole and reserved hole in sequence, disassembled from steel box girder, top frame mechanism directly is lifted and transported machine from steel box girder from above moves away;To solve the problem that the existing hoisting installation device disassembling process is complicated, time-consuming is longer.

Description

Technical Field

[0001] The present invention relates to the technical field of bridges, and in particular to a device and method for hoisting and installing a steel box girder of a sea-crossing bridge. Background Art

[0002] Steel box girders, also known as steel plate box girders, are a common structural form for long-span bridges. They are typically used on bridges with large spans and are so-called because of their box-like appearance. Steel box girders are typically constructed by fully welded connections of top and bottom plates, webs, transverse and longitudinal diaphragms, and stiffening ribs. The top plate is an orthotropic deck consisting of a cover plate and longitudinal stiffening ribs. During installation, steel box girders are typically hoisted onto bridge piers using a crane, followed by welding.

[0003] When hoisting a steel box girder, it is usually necessary to first assemble a special hoisting and installation device on the steel box girder. The device is fixed to the steel box girder by bolt locking. Then, a crane is used to connect and lift the hoisting and installation device to achieve the overall lifting of the steel box girder. However, the hoisting and installation device fixed with bolts in the existing technology often faces the problem of inconvenience in disassembly after completing the installation process of the steel box girder. Specifically, the disassembly process is cumbersome and time-consuming, thereby affecting the overall construction efficiency and cost control. Therefore, optimizing the design of the hoisting and installation device so that it is easy to install quickly and easy to disassemble efficiently has become an important issue that needs to be solved in the current field of bridge engineering technology. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for hoisting and installing a steel box girder of a sea-crossing bridge, aiming to solve the problem that the disassembly process of the existing hoisting and installation device is cumbersome and time-consuming.

[0005] To achieve the above-mentioned object, in a first aspect, the present invention provides a device for hoisting and installing a steel box girder of a sea-crossing bridge, which is used for hoisting and installing a steel box girder, wherein the steel box girder is provided with four reserved holes;

[0006] Includes installation components;

[0007] The installation assembly includes a top frame mechanism and two installation mechanisms; the top frame mechanism is located above the steel box girder; the two installation mechanisms are respectively arranged on the top frame mechanism;

[0008] The installation mechanism includes a support frame, two suspension rods, two limiting columns, two docking blocks, two driving members, two insertion rods and two lifting members;

[0009] The supporting bracket is located at the bottom of the steel box girder; the two hangers are respectively fixed on the supporting bracket and pass through the two reserved holes respectively; the two limit columns are respectively fixed on the top of the two hangers; the two docking blocks are respectively slidably arranged on the top frame mechanism; the docking block has a first adapter hole and a second adapter hole, and the first adapter hole is connected to the second adapter hole; the two driving members are respectively arranged on the top frame mechanism, for respectively driving the two docking blocks to slide horizontally; the two insertion rods are respectively slidably arranged on the top frame mechanism; the two lifting members are respectively arranged on the top frame mechanism, for respectively driving the two insertion rods to slide and lift; each of the second adapter holes passes through a hanging rod; each of the first adapter holes passes through a insertion rod.

[0010] Wherein, the installation mechanism further includes two limiting sleeves;

[0011] The two limiting sleeves are respectively fixedly connected to the two suspension rods and pass through the two reserved holes respectively.

[0012] Wherein, the top frame mechanism includes a truss, four lifting ears and a mounting frame;

[0013] The truss is located above the steel box girder; the four lifting ears are fixedly arranged on the truss respectively; and the mounting frame is fixedly arranged at the bottom of the truss.

[0014] Wherein, the driving member includes a first mounting plate, a first hydraulic cylinder and a connecting shaft;

[0015] The first mounting plate is fixedly arranged on the mounting frame; the first hydraulic cylinder is fixedly arranged on the first mounting plate; the connecting shaft is slidably arranged on the mounting frame, one end of the connecting shaft is fixedly connected to the docking block, and the other end of the connecting shaft is fixedly connected to the output end of the first hydraulic cylinder.

[0016] Wherein, the lifting member includes a second mounting plate and a second hydraulic cylinder;

[0017] The second mounting plate is fixedly arranged on the mounting frame; the second hydraulic cylinder is fixedly arranged on the second mounting plate, and the output end of the second hydraulic cylinder is fixedly connected to the insertion rod.

[0018] Wherein, the installation assembly further includes two reinforcement mechanisms;

[0019] The two reinforcement mechanisms are respectively arranged on the mounting frame.

[0020] Wherein, the reinforcement mechanism includes a guide ring, a slider, a support claw and a third hydraulic cylinder;

[0021] The guide ring is fixedly arranged on the top of the mounting frame; the slider is slidably arranged on the inner side of the guide ring; the support claw is fixedly arranged on one side of the slider; the third hydraulic cylinder is fixedly arranged on the top of the mounting frame; the output end of the third hydraulic cylinder is fixedly connected to the slider.

[0022] In a second aspect, the present invention further provides a method for hoisting and installing a steel box girder of a sea-crossing bridge, comprising:

[0023] The transport ship transports the steel box girder to the installation location;

[0024] The double-arm crane moves to the side of the transport ship and hooks the four lifting lugs with four hooks to lift the steel box girder, and the transport ship moves out of the installation position;

[0025] The double-arm crane moves forward, lifts the steel box girder above the two piers, and then slowly moves it downward to install it on top of the two piers;

[0026] Two ships carrying lifting platforms are moved to the bottom of the two support brackets respectively, and the two lifting platforms are raised to support the two support brackets respectively;

[0027] The second hydraulic cylinder drives the insertion rod to move upward and completely remove it from the first adapter hole;

[0028] The first hydraulic cylinder drives the docking block to move toward the first hydraulic cylinder, so that the boom is finally located in the first adapter hole, and the limit column is aligned with the first adapter hole;

[0029] The two lifting platforms gradually descend, driving the two supporting brackets to descend, and the boom also gradually descends. The limit column passes through the first adapter hole and disengages from the docking block, and then passes through the reserved hole and disengages from the steel box girder;

[0030] The two third hydraulic cylinders push the two slide blocks away from each other, the two supporting claws release the steel box girder, and the double-arm crane lifts and removes the truss, driving the mounting frame to move away from above the steel box girder.

[0031] The present invention provides a device and method for hoisting and installing a steel box girder of a sea-crossing bridge. The apertures of the reserved hole and the first adapting hole are the same, and both are adapted to the limiting column. The limiting column can pass through the reserved hole and the first adapting hole. The diameter of the hanger is smaller than that of the limiting column and is adapted to the aperture of the second adapting hole. The cross-section of the insertion rod is an incomplete circle with a crescent-shaped notch for adapting and engaging with the outer shape of the limiting column. The cross-section of the insertion rod is completed into a circle and adapted to the aperture of the first adapting hole. When installed on the steel box girder, the support bracket is placed under the steel box girder, and the The hanger rod passes through the reserved hole accordingly, and then the top frame mechanism is lifted above the steel box beam so that the first adapter hole is aligned with the limit column, and then the top frame mechanism is moved down and placed on the steel box beam. At this time, the limit column also completely passes through the first adapter hole, and the hanger rod is located in the first adapter hole. Then, the driving member is started to push the docking block and move it in the direction away from the driving member. Finally, the hanger rod is located in the second adapter hole and meshed with the second adapter hole. At this time, the first adapter hole is aligned with the insertion rod, and then the lifting member drives the insertion rod to descend, and the insertion rod The first adapter hole is inserted into the first adapter hole, and the limiting column is stuck from the side. The limiting column cannot pass through the second adapter hole, so the hanger is locked on the docking block, and every two hangers hang one supporting bracket under the top frame mechanism; when the steel box girder needs to be hoisted, the top frame mechanism can be lifted by a lifting machinery to lift the steel box girder; when it needs to be disassembled, the lifting member drives the insertion rod to move upward and completely remove it from the first adapter hole, no longer blocking the limiting column, and then the driving member drives the docking block to move in the direction close to the driving member, so that the hanger is finally in the In the first adapting hole, the limiting column is aligned with the first adapting hole, and the limiting column can pass through the first adapting hole and disengage from the docking block. At this time, the supporting bracket is continuously moved downward, and the limiting column can pass through the first adapting hole and the reserved hole in turn, and be removed from the steel box girder. The upper top frame mechanism is directly removed from the steel box girder from above by the lifting machinery. Finally, the cross-sea bridge steel box girder lifting and installation device of the present application is divided into two parts, which are removed from the upper and lower sides of the steel box girder respectively; thereby solving the problem that the disassembly process of the existing lifting and installation device is cumbersome and time-consuming. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0033] Figure 1 It is a structural diagram of the first embodiment of the present invention.

[0034] Figure 2 It is a front view of the first embodiment of the present invention.

[0035] Figure 3 yes Figure 2 A partial enlargement of detail A.

[0036] Figure 4 It is a structural schematic diagram of the first embodiment of the present invention from another angle.

[0037] Figure 5 yes Figure 4 A partial enlargement of detail B.

[0038] Figure 6 It is a structural schematic diagram of the suspension rod, the limiting column and the docking block of the first embodiment of the present invention.

[0039] Figure 7 It is a structural schematic diagram of the suspension rod, the limiting column and the docking block according to the first embodiment of the present invention from another angle.

[0040] Figure 8 It is a structural schematic diagram of the suspension rod, the limiting column, the docking block and the insertion rod of the first embodiment of the present invention.

[0041] Figure 9 It is a flow chart of the second embodiment of the present invention.

[0042] 1-steel box girder, 2-top frame mechanism, 3-installation mechanism, 4-reinforcement mechanism, 11-reserved holes, 21-truss, 22-lifting ear, 23-installation frame, 31-support frame, 32-suspender rod, 33-limiting column, 34-docking block, 35-driving member, 36-insertion rod, 37-lifting member, 38-limiting sleeve, 41-guide ring, 42-slider, 43-support claw, 44-third hydraulic cylinder, 341-first adapter hole, 342-second adapter hole, 351-first mounting plate, 352-first hydraulic cylinder, 353-connecting shaft, 371-second mounting plate, 372-second hydraulic cylinder. DETAILED DESCRIPTION

[0043] The first embodiment of this application is:

[0044] See also Figures 1-8 ,in, Figure 1 It is a structural diagram of the first embodiment of the present invention. Figure 2 It is a front view of the first embodiment of the present invention. Figure 3 yes Figure 2 A partial enlargement of detail A. Figure 4 It is a structural schematic diagram of the first embodiment of the present invention from another angle. Figure 5 yes Figure 4 A partial enlargement of detail B. Figure 6It is a structural schematic diagram of the suspension rod, the limiting column and the docking block of the first embodiment of the present invention. Figure 7 It is a structural schematic diagram of the suspension rod, the limiting column and the docking block according to the first embodiment of the present invention from another angle. Figure 8 It is a structural schematic diagram of the suspension rod, the limiting column, the docking block and the insertion rod of the first embodiment of the present invention.

[0045] The present invention provides a device for hoisting and installing a steel box girder of a sea-crossing bridge, which is used for hoisting and installing a steel box girder 1. The steel box girder 1 is provided with four reserved holes 11; it includes an installation assembly; the installation assembly includes a top frame mechanism 2 and two installation mechanisms 3; the installation mechanism 3 includes a support frame 31, two suspension rods 32, two limit columns 33, two docking blocks 34, two driving members 35, two insertion rods 36 and two lifting members 37; the docking block 34 has a first adapter hole 341 and a second adapter hole 342; the installation mechanism 3 also includes Two limit sleeves 38; the top frame mechanism 2 includes a truss 21, four lifting ears 22 and a mounting frame 23; the driving member 35 includes a first mounting plate 351, a first hydraulic cylinder 352 and a connecting shaft 353; the lifting member 37 includes a second mounting plate 371 and a second hydraulic cylinder 372; the installation assembly also includes two reinforcement mechanisms 4; the reinforcement mechanism 4 includes a guide ring 41, a slider 42, a support claw 43 and a third hydraulic cylinder 44; the above-mentioned solution solves the problem that the disassembly process of the existing lifting and installation device is cumbersome and time-consuming.

[0046] Furthermore, the top frame mechanism 2 is located above the steel box girder 1; the two mounting mechanisms 3 are respectively arranged on the top frame mechanism 2; the support bracket 31 is located at the bottom of the steel box girder 1; the two suspension rods 32 are respectively fixedly arranged on the support bracket 31 and pass through the two reserved holes 11 respectively; the two limiting columns 33 are respectively fixedly arranged on the top of the two suspension rods 32; the two docking blocks 34 are respectively slidably arranged on the top frame mechanism 2; the docking block 34 has a first adapter hole 341 and a second adapter hole 342 , the first adapter hole 341 is connected to the second adapter hole 342; the two driving members 35 are respectively arranged on the top frame mechanism 2, for respectively driving the two docking blocks 34 to slide horizontally; the two insertion rods 36 are respectively slidably arranged on the top frame mechanism 2; the two lifting members 37 are respectively arranged on the top frame mechanism 2, for respectively driving the two insertion rods 36 to slide and rise; each of the second adapter holes 342 passes through a said suspension rod 32; each of the first adapter holes 341 passes through a said insertion rod 36.

[0047] In this embodiment, the aperture of the reserved hole 11 and the first adapting hole 341 is the same, and both are adapted to the limiting column 33. The limiting column 33 can pass through the reserved hole 11 and the first adapting hole 341. The diameter of the suspension rod 32 is smaller than that of the limiting column 33 and is adapted to the aperture of the second adapting hole 342. The cross-section of the insertion rod 36 is an incomplete circle with a crescent-shaped notch for adapting and engaging with the shape of the limiting column 33. The circular cross-section of the insertion rod 36 is completed and adapted to the aperture of the first adapting hole 341. When installed on the steel box girder 1, the support bracket 31 is placed under the steel box girder 1, and the suspension rod 32 is passed through the reserved hole accordingly. Hole 11, then the top frame mechanism 2 is lifted above the steel box girder 1, so that the first adapter hole 341 is aligned with the limit column 33, and then the top frame mechanism 2 is moved down and placed on the steel box girder 1. At this time, the limit column 33 also completely passes through the first adapter hole 341, and the suspension rod 32 is located in the first adapter hole 341. Then, the driving member 35 is started to push the docking block 34 and move it in the direction away from the driving member 35. Finally, the suspension rod 32 is located in the second adapter hole 342 and engages with the second adapter hole 342. At this time, the first adapter hole 341 is aligned with the insertion rod 36, and then the lifting member 37 drives the insertion rod 36 to descend and insert The first adapter hole 341 clamps the limit column 33 from the side, and the limit column 33 cannot pass through the second adapter hole 342, so the suspension rod 32 is locked on the docking block 34, and every two suspension rods 32 hang one support bracket 31 under the top frame mechanism 2; when it is necessary to hoist the steel box girder 1, the top frame mechanism 2 is lifted by a lifting machine to lift the steel box girder 1; when it is necessary to disassemble, the lifting member 37 drives the insertion rod 36 to move upward and completely move out of the first adapter hole 341, no longer clamping the limit column 33, and then the driving member 35 drives the docking block 34 to move in the direction close to the driving member 35, so that the suspension rod 36 32 is finally located in the first adapter hole 341. At this time, the limit column 33 is aligned with the first adapter hole 341, and the limit column 33 can pass through the first adapter hole 341 and disengage from the docking block 34. At this time, the support bracket 31 is continuously moved downward, and the limit column 33 can pass through the first adapter hole 341 and the reserved hole 11 in turn, and be removed from the steel box girder 1. The upper top frame mechanism 2 is directly removed from the steel box girder 1 from above by the lifting machinery. Finally, the cross-sea bridge steel box girder lifting and installation device of the present application is divided into two parts, which are removed from the upper and lower sides of the steel box girder 1 respectively; thereby solving the problem that the disassembly process of the existing lifting and installation device is cumbersome and time-consuming.

[0048] Furthermore, the two limiting sleeves 38 are fixedly connected to the two suspension rods 32 respectively, and pass through the two reserved holes 11 respectively.

[0049] In this embodiment, the outer diameter of the limit sleeve 38 is adapted to the aperture of the reserved hole 11. Since the diameter of the suspension rod 32 is smaller than the aperture of the reserved hole 11, the steel box girder 1 has a certain amount of movement space during the lifting of the steel box girder 1. In order to avoid instability caused by movement, the limit sleeve 38 is provided so that the steel box girder 1 is stuck.

[0050] Furthermore, the truss 21 is located above the steel box girder 1 ; the four lifting ears 22 are respectively fixedly arranged on the truss 21 ; and the mounting frame 23 is fixedly arranged at the bottom of the truss 21 .

[0051] In this embodiment, the truss 21 is used to set four lifting ears 22 on the top for docking with four hooks of a double-arm crane ship, and the mounting frame 23 is fixedly installed below. The mounting frame 23 has a guide rod on which the docking block 34 is slidably installed.

[0052] Furthermore, the first mounting plate 351 is fixedly set on the mounting frame 23; the first hydraulic cylinder 352 is fixedly set on the first mounting plate 351; the connecting shaft 353 is slidably set on the mounting frame 23, one end of the connecting shaft 353 is fixedly connected to the docking block 34, and the other end of the connecting shaft 353 is fixedly connected to the output end of the first hydraulic cylinder 352.

[0053] In this embodiment, the first mounting plate 351 is used to fix the first hydraulic cylinder 352 , and the output end of the first hydraulic cylinder 352 is fixedly connected to the docking block 34 via the connecting shaft 353 , so that the first hydraulic cylinder 352 can drive the docking block 34 to move horizontally.

[0054] Furthermore, the second mounting plate 371 is fixedly disposed on the mounting frame 23 ; the second hydraulic cylinder 372 is fixedly disposed on the second mounting plate 371 , and the output end of the second hydraulic cylinder 372 is fixedly connected to the insertion rod 36 .

[0055] In this embodiment, the second mounting plate 371 is used to mount the second hydraulic cylinder 372 , and the second hydraulic cylinder 372 is used to drive the insertion rod 36 to rise, fall and slide.

[0056] Furthermore, the two reinforcement mechanisms 4 are respectively arranged on the mounting frame 23 .

[0057] In this embodiment, the steel box beam 1 is supported by only two support brackets 31 , which is not stable enough, so two reinforcement mechanisms 4 are provided for reinforcement.

[0058] Furthermore, the guide ring 41 is fixedly arranged on the top of the mounting frame 23; the slider 42 is slidably arranged on the inner side of the guide ring 41; the support claw 43 is fixedly arranged on one side of the slider 42; the third hydraulic cylinder 44 is fixedly arranged on the top of the mounting frame 23; the output end of the third hydraulic cylinder 44 is fixedly connected to the slider 42.

[0059] In this embodiment, the guide ring 41 is used to slide and install the slider 42, and the third hydraulic cylinder 44 is used to push the slider 42 to slide, thereby driving the support claw 43 to move. After the whole is installed on the steel box girder 1, the two third hydraulic cylinders 44 can also be started to drive the two support claws 43 to close together, buckle and support the steel box girder 1 from both sides, which is more stable.

[0060] The embodiment of the invention is a device for hoisting and installing a steel box girder of a sea-crossing bridge. After being installed on the steel box girder 1, Figure 1As shown, each of the second adapter holes 342 passes through a said lifting rod 32; each of the first adapter holes 341 passes through a said insert rod 36, and the two said support brackets 31 are located at the bottom of the said steel box girder 1; during the lifting and installation, the transport ship transports the said steel box girder 1 installed with the lifting and installation device of the present application to the installation position, the double-arm crane ship moves to the side of the transport ship, and hooks the four said lifting ears 22 with four hooks to lift the said steel box girder 1, and the transport ship withdraws from the installation position; the double-arm crane ship moves forward, lifts the said steel box girder 1 above the two bridge piers, and aligns and slowly moves downward to install the said steel box girder 1 on the top of the two bridge piers; two ships carrying lifting platforms move to the bottom of the two said support brackets 31 respectively, and raise the two lifting platforms respectively to support the two said support brackets 31; the second hydraulic cylinder 372 drives the said insert rod 36 to move upward, completely move out of the first adapter hole 341, and no longer blocks the said limit column 33; the first hydraulic The cylinder 352 drives the docking block 34 to move in the direction close to the first hydraulic cylinder 352, so that the boom 32 is finally located in the first adapter hole 341, at this time the limit column 33 is aligned with the first adapter hole 341; the two lifting platforms gradually descend, driving the two supporting brackets 31 to descend, and the boom 32 also gradually descends, the limit column 33 passes through the first adapter hole 341 and disengages from the docking block 34, and then passes through the reserved hole 11 and disengages from the steel box girder 1; the two third hydraulic cylinders 44 push the two sliders 42 away from each other, and the two support claws 43 release the steel box girder 1, and the double-arm crane lifts and removes the truss 21, driving the mounting frame 23 to move away from above the steel box girder 1; finally, the cross-sea bridge steel box girder lifting and installation device of the present application is divided into two parts, and the upper and lower parts are removed from the upper and lower sides of the steel box girder 1 respectively; thereby solving the problem that the disassembly process of the existing lifting and installation device is cumbersome and time-consuming.

[0061] The second embodiment of this application is:

[0062] See also Figure 9 ,in, Figure 9 It is a flowchart of the second embodiment of the present invention.

[0063] The present invention provides a method for hoisting and installing a steel box girder of a sea-crossing bridge, comprising:

[0064] The transport ship S1 transports the steel box girder 1 to the installation location;

[0065] S2 double-arm crane moves to the side of the transport ship, hooks four lifting lugs 22 with four hooks, lifts the steel box girder 1, and the transport ship withdraws from the installation position;

[0066] The S3 double-arm crane moves forward, lifts the steel box girder 1 above the two bridge piers, and then slowly moves downward to install the steel box girder 1 on top of the two bridge piers;

[0067] S4: The two ships carrying the lifting platforms move to the bottom of the two support brackets 31 respectively, and raise the two lifting platforms to support the two support brackets 31 respectively;

[0068] S5 The second hydraulic cylinder 372 drives the insertion rod 36 to move upward and completely out of the first adapter hole 341;

[0069] S6: The first hydraulic cylinder 352 drives the docking block 34 to move toward the first hydraulic cylinder 352, so that the boom 32 is finally located in the first adapter hole 341. At this time, the limiting column 33 is aligned with the first adapter hole 341.

[0070] S7 The two lifting platforms gradually descend, driving the two supporting brackets 31 to descend, and the suspension rod 32 also gradually descends. The limiting column 33 passes through the first adapter hole 341 and disengages from the docking block 34, and then passes through the reserved hole 11 and disengages from the steel box girder 1;

[0071] S8 The two third hydraulic cylinders 44 push the two sliders 42 away from each other, the two supporting claws 43 release the steel box girder 1, and the double-arm crane lifts the truss 21 and moves it away, driving the mounting frame 23 to move away from above the steel box girder 1.

[0072] The above disclosure is merely one or more preferred embodiments of the present application and is not intended to limit the scope of the present application. A person skilled in the art will understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present application are still within the scope of the present application.

Claims

1. A device for hoisting and installing a steel box girder of a sea-crossing bridge, used for hoisting and installing a steel box girder, wherein the steel box girder is provided with four reserved holes; characterized in that: Includes installation components; The installation assembly includes a top frame mechanism and two installation mechanisms; the top frame mechanism is located above the steel box girder; the two installation mechanisms are respectively arranged on the top frame mechanism; The installation mechanism includes a support frame, two suspension rods, two limiting columns, two docking blocks, two driving members, two insertion rods and two lifting members; The support bracket is located at the bottom of the steel box girder; the two suspension rods are respectively fixed on the support bracket and pass through the two reserved holes respectively; the two limit columns are respectively fixed on the top of the two suspension rods; the two docking blocks are respectively slidably arranged on the top frame mechanism; the docking block has a first adapter hole and a second adapter hole, and the first adapter hole is connected to the second adapter hole; the two driving members are respectively arranged on the top frame mechanism, for respectively driving the two docking blocks to slide horizontally; The two insertion rods are respectively slidably arranged on the top frame mechanism; the two lifting members are respectively arranged on the top frame mechanism, and are used to respectively drive the two insertion rods to slide and lift; one suspension rod passes through each of the second adapter holes; and one insertion rod passes through each of the first adapter holes.

2. The device for hoisting and installing a steel box girder of a sea-crossing bridge according to claim 1, characterized in that: The installation mechanism also includes two limiting sleeves; The two limiting sleeves are respectively fixedly connected to the two suspension rods and pass through the two reserved holes respectively.

3. The device for hoisting and installing a steel box girder of a sea-crossing bridge according to claim 2, characterized in that: The top frame mechanism includes a truss, four lifting ears and a mounting frame; The truss is located above the steel box girder; the four lifting ears are fixedly arranged on the truss respectively; and the mounting frame is fixedly arranged at the bottom of the truss.

4. The device for hoisting and installing a steel box girder of a sea-crossing bridge according to claim 3, characterized in that: The driving member includes a first mounting plate, a first hydraulic cylinder and a connecting shaft; The first mounting plate is fixedly arranged on the mounting frame; the first hydraulic cylinder is fixedly arranged on the first mounting plate; the connecting shaft is slidably arranged on the mounting frame, one end of the connecting shaft is fixedly connected to the docking block, and the other end of the connecting shaft is fixedly connected to the output end of the first hydraulic cylinder.

5. The device for hoisting and installing a steel box girder of a sea-crossing bridge according to claim 4, characterized in that: The lifting member includes a second mounting plate and a second hydraulic cylinder; The second mounting plate is fixedly arranged on the mounting frame; the second hydraulic cylinder is fixedly arranged on the second mounting plate, and the output end of the second hydraulic cylinder is fixedly connected to the insertion rod.

6. The device for hoisting and installing a steel box girder of a sea-crossing bridge according to claim 5, characterized in that: The mounting assembly also includes two reinforcement mechanisms; The two reinforcement mechanisms are respectively arranged on the mounting frame.

7. The device for hoisting and installing a steel box girder of a sea-crossing bridge according to claim 6, characterized in that: The reinforcement mechanism includes a guide ring, a slider, a support claw and a third hydraulic cylinder; The guide ring is fixedly arranged on the top of the mounting frame; the slider is slidably arranged on the inner side of the guide ring; the support claw is fixedly arranged on one side of the slider; the third hydraulic cylinder is fixedly arranged on the top of the mounting frame; the output end of the third hydraulic cylinder is fixedly connected to the slider.

8. A method for hoisting and installing a steel box girder of a sea-crossing bridge, using the device for hoisting and installing a steel box girder of a sea-crossing bridge as claimed in claim 7, characterized in that: include; The transport ship transports the steel box girder to the installation location; The double-arm crane moves to the side of the transport ship and hooks the four lifting lugs with four hooks to lift the steel box girder, and the transport ship moves out of the installation position; The double-arm crane moves forward, lifts the steel box girder above the two piers, and then slowly moves it downward to install it on top of the two piers; Two ships carrying lifting platforms are moved to the bottom of the two support brackets respectively, and the two lifting platforms are raised to support the two support brackets respectively; The second hydraulic cylinder drives the insertion rod to move upward and completely remove it from the first adapter hole; The first hydraulic cylinder drives the docking block to move toward the first hydraulic cylinder, so that the boom is finally located in the first adapter hole, and the limit column is aligned with the first adapter hole; The two lifting platforms gradually descend, driving the two supporting brackets to descend, and the boom also gradually descends. The limit column passes through the first adapter hole and disengages from the docking block, and then passes through the reserved hole and disengages from the steel box girder; The two third hydraulic cylinders push the two slide blocks away from each other, the two supporting claws release the steel box girder, and the double-arm crane lifts and removes the truss, driving the mounting frame to move away from above the steel box girder.

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