A steel-concrete composite lifting caisson structure for bridge cap and its construction method

Abstract

The present invention discloses a steel-concrete composite suspension box structure for bridge pile caps and a construction method thereof, which includes a concrete bottom plate and a wall plate. A plurality of installation holes are formed in the concrete bottom plate, and the concrete bottom plate is sleeved on a steel casing used in cooperation with the suspension box structure through the installation holes. The wall plate is fixedly installed on the concrete bottom plate along the circumference, and the wall plate extends in the vertical direction; a plurality of fixing blocks are arranged at intervals along the circumference on the outer side of the wall plate, and a locking screw is threadedly installed on the fixing block. One end of the locking screw passing through the fixing block is threadedly connected to the concrete bottom plate. This application has the effects of reducing the manufacturing cost of the suspension box and facilitating workers to install the bottom plate on the steel casing.

Description

Technical Field

[0001] The present invention relates to the field of engineering construction, and particularly relates to a steel-concrete combined suspension box structure for bridge capitals and a construction method thereof. Background Art

[0002] Currently, when building bridges in deep water areas of the sea, high-pile capitals are usually used as the pile foundations of the main piers of the bridges. The most common construction method for high-pile capitals is steel suspension box construction. First, a fully prefabricated steel suspension box is made, and then a crane ship is used to hoist the steel suspension box as a whole to the construction site and sleeved on the steel casing of the high-pile capital. After manual adjustment, the steel suspension box is lowered to a predetermined depth; the formwork of the capital is installed in the steel suspension box and concrete is poured to complete the construction of the capital. At this time, the construction of the bridge can start based on this high-pile capital.

[0003] In view of the above related technologies, when using a fully prefabricated steel suspension box as the construction foundation of a high-pile capital, the cost of the fully prefabricated steel suspension box is expensive, and when transporting the steel suspension box to a predetermined position at sea and installing it on the steel casing, the overall volume of the steel suspension box is too large, and it is difficult to adjust the steel suspension box so that the precast bottom plate on the steel suspension box can be accurately sleeved on each steel casing. Summary of the Invention

[0004] In order to reduce the manufacturing cost of the suspension box and facilitate workers to install the bottom plate on the steel casing, the present application provides a steel-concrete combined suspension box structure for bridge capitals and a construction method thereof.

[0005] In a first aspect, a steel-concrete combined suspension box structure for bridge capitals provided by the present application adopts the following technical solutions:

[0006] A steel-concrete combined suspension box structure for bridge capitals includes a concrete bottom plate and a wall panel. Reinforcing bars are embedded in the concrete bottom plate. A plurality of installation holes are formed in the concrete bottom plate. The concrete bottom plate is sleeved on a steel casing used in cooperation with the suspension box structure through the installation holes. The wall panel is fixedly installed on the concrete bottom plate in a circumferential direction and extends vertically; a plurality of fixing blocks are arranged at intervals along the circumferential direction on the outer side of the wall panel. A locking screw is threadedly installed on the fixing block, and one end of the locking screw passing through the fixing block is threadedly connected to the concrete bottom plate.

[0007] By adopting the above technical solutions, first, a concrete bottom plate of the suspension box is precast using a steel bar framework and concrete outside the construction site. Compared with using a fully steel suspension box, using a precast concrete bottom plate not only ensures the structural strength but also greatly reduces the manufacturing cost; at the same time, in the case of the same volume, using a concrete bottom plate reduces the overall weight of the bottom plate, thereby reducing the hoisting weight required during the construction hoisting process and improving the safety factor; after installing the concrete bottom plate, the wall panel is fixed on the concrete bottom plate and the wall panel is tensioned on the outside using a locking screw to reduce the risk of the wall panel tipping over.

[0008] Preferably, the concrete bottom slab comprises a plurality of spliced bottom slab monomers, and adjacent two bottom slab monomers are connected by reinforced concrete; one bottom slab monomer corresponds to one steel casing, and an installation hole is formed in each bottom slab monomer and sleeved on the corresponding steel casing through the installation hole; a supporting member for supporting the bottom slab monomer is arranged on each steel casing.

[0009] By adopting the above technical scheme, after transporting a plurality of bottom slab monomers to the position of the steel casings, a crane is used to sleeved the bottom slab monomers on the steel casings one by one. Compared with the overall lowering of a fully prefabricated steel suspension box, it is necessary to align the steel suspension box with all the steel casings before it can be stably lowered. The single bottom slab monomer is convenient to adjust, with a small hoisting difficulty, which is convenient for workers to quickly hoist, speeds up the construction speed, and thus speeds up the overall progress of the project; at the same time, the connection is carried out by reinforced concrete to ensure the connection strength between the bottom slab monomers and improve the overall structural stability of the concrete bottom slab.

[0010] Preferably, the supporting member comprises a support beam, a pair of locking holes are formed in the side wall of each steel casing, the two locking holes are arranged oppositely, and the two ends of the support beam pass through the steel casing through the opposite two locking holes, and the side of the support beam passing through the steel casing and facing upwards is used for abutting against the bottom slab monomer.

[0011] By adopting the above technical scheme, when installing the support beam, the support beam only needs to be directly passed through the locking holes on the steel casing. After the bottom slab monomer is lowered, the support beam forms a direct and stable support for the bottom slab monomers on each steel casing. At the same time, there is no connection between the support beam and the steel casing, which is convenient for workers to remove the support beam during subsequent construction.

[0012] Preferably, the support beam comprises a pair of hinged segments that are rotatably connected to each other. The hinge point of the support beam is located inside the steel casing, and a strengthening component for strengthening the connection strength between the two hinged segments is installed on the support beam.

[0013] When it is necessary to recycle and reuse the support beam, since the concrete bottom slab presses on the support beam at this time, it is difficult for workers to go to the locking holes on the steel casing beyond the suspension box from the outside to remove the support beam; by adopting the above technical scheme, when installing the bottom slab monomer, the two hinged segments that are rotated and parallel to each other are stably connected by the strengthening component and inserted on the steel casing. When removing the support beam, the support beam is lifted from inside the steel casing, and the two hinged segments rotate relative to each other, so as to be disengaged from the steel casing through the locking holes, and then the entire support beam is disengaged from the steel casing. This removal method reduces the removal process of workers and the difficulty of removing the support beam, and realizes the rapid disassembly of the support beam.

[0014] Preferably, the reinforcing assembly includes a pair of reinforcing rods and a pair of driving blocks. Each of the hinge segments is provided with a sliding groove extending along its own length direction. The two reinforcing rods are respectively installed on the two hinge segments on the same support beam in a sliding manner through the sliding grooves. Each of the hinge segments is communicated with a driving groove at the bottom of the sliding groove. The driving block is installed on the hinge segment in a sliding manner through the driving groove. The upper side of the driving block protrudes from the hinge segment and is provided with a guiding surface. The driving block abuts against the reinforcing rod. On one side of the two hinge segments on the same support beam close to each other, a connecting groove for inserting the slid reinforcing rod is provided. An elastic member is sleeved on the reinforcing rod. One end of the elastic member is connected to the reinforcing rod and the other end is fixed in the sliding groove.

[0015] By adopting the above technical solution, after the bottom plate unit is installed on the steel casing, the lower side of the bottom plate unit abuts against the two driving blocks on the support beam. Through the action of the guiding surface, the two driving blocks are pushed to move in the driving groove towards the direction close to the steel casing, thereby pushing the reinforcing rod to slide towards the direction close to the other hinge segment and inserting into the connecting groove to be stabilized within the two hinge segments, improving the stability of the support beam. When the support beam needs to be removed, the concrete bottom plate is lifted. At this time, the elastic member drives the reinforcing rod to reset into the corresponding hinge segment, and the worker can lift the support beam to complete the removal. The reinforcing assembly drives the reinforcing rod to slide through the gravity of the bottom plate unit, realizes the self-locking of the two hinge segments, and reduces the use of driving parts.

[0016] Preferably, each of the bottom plate units is provided with an installation groove along the circumferential direction at the installation hole. A water bag is arranged in the installation groove of the bottom plate unit. One side of the water bag facing the steel casing abuts against the steel casing.

[0017] By adopting the above technical solution, since the cross-sectional diameter of the installation hole is larger than the cross-sectional diameter of the steel casing, in order to reduce the leakage of concrete through the gap between the bottom plate unit and the steel casing when pouring the bearing platform, before pouring the bearing platform, water is flushed into the water bag to make the water bag expand until the water bag abuts against the steel casing to form a seal. At this time, it is difficult for the concrete for pouring the bearing platform to leak from this gap, reducing the waste of concrete.

[0018] Preferably, the wall panel includes a plurality of interconnected steel sheet piles. The steel sheet piles include a first-section steel sheet pile, intermediate steel sheet piles and a last-section steel sheet pile which are connected in sequence. A plurality of intermediate steel sheet piles are provided.

[0019] Angle steels are provided on the sides of the first sheet pile and the last sheet pile that are close to each other. Channels are provided on the sides of the two angle steels that are close to each other. The inner notch of the channel is fixedly connected to the corresponding angle steel. A connection cavity is formed between the two channels. A number of pairs of C-shaped members and I-shaped members are provided in the connection cavity. The sides of each pair of C-shaped members that are close to each other are open, and the sides that are far from each other are fixedly connected to the sides of the two channels that are far from the corresponding angle steels. Each I-shaped member is inserted into the two C-shaped members through the openings of the two C-shaped members in the same pair; Waterproof fillers are provided between each pair of C-shaped members.

[0020] After the connection between the sheet pile and the concrete bottom plate is completed, in order to achieve the seal between the first sheet pile and the last sheet pile, by adopting the above technical solution, first weld the angle steel on the sheet pile, so that the channel can be connected to the irregular sheet pile through the angle steel, and then install the C-shaped member and the I-shaped member, and jointly act with the waterproof filler to block water at the connection cavity, further preventing the outside water from pouring into the caisson from the connection cavity, creating a good construction environment for workers and improving the safety factor of workers' construction.

[0021] Preferably, a steel panel is fixedly installed along the circumference on the side of the wall panel facing the inside of the caisson.

[0022] By adopting the above technical solution, welding the steel panel inside the wall panel, first, it forms a good seal for the inside of the caisson, further preventing the outside water from entering the caisson, and at the same time the steel panel can also serve as the formwork for the bearing platform, improving the construction quality of the bearing platform.

[0023] In a second aspect, a construction method of a steel-concrete composite caisson structure based on a bridge bearing platform provided by the present application includes:

[0024] S1: Build a construction platform and bury a steel casing at the predetermined construction position, and precast a concrete bottom plate;

[0025] S2: Transport the concrete bottom plate to the predetermined construction position and sleeved it on the steel casing;

[0026] S3: Install the wall panel on the concrete bottom plate to form a caisson body;

[0027] S4: Install formwork inside the caisson body and pour concrete to form a bearing platform.

[0028] By adopting the above technical solution, the concrete bottom plate is processed in the factory before the caisson construction, with relatively high processing accuracy. At the same time, using the precast concrete caisson bottom plate reduces the material input and achieves the purpose of green and civilized construction.

[0029] Preferably, in step S3, after the installation of the C-shaped member is completed, the steel panel is welded and fixed on the side of the steel sheet pile circumferentially away from the connection cavity. When the welding of the steel panel is completed, angle irons are installed on the C-shaped member close to the steel panel, and a rubber water stop plate is arranged between the two angle irons; a tie rod is arranged between the two channel steels, and the tie rod passes through the two channel steels at the same time, and the ends of the tie rod passing through the channel steel are threadedly connected with tie nuts.

[0030] By adopting the above technical solution, the welding position of the steel panel is staggered from the connection cavity, so that the connection cavity is covered by the complete steel panel, thereby reducing the risk of water gushing from the connection cavity and flowing into the suspension box through the welding seam of the steel panel. Then the worker tightens the tie rod to drive the two channel steels to move towards each other, thereby squeezing the rubber water stop belt sandwiched between the two angle irons to deform, and obtaining a better sealing effect.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. Through the concrete bottom plate arranged in blocks, first, the material input is reduced, and the cost of the prefabricated suspension box is reduced; second, the single bottom plate is convenient for transportation and can be stacked for transportation, reducing the transportation space required for the suspension box. And compared with the overall lowering of the fully prefabricated steel suspension box, when the steel suspension box needs to be aligned with all the steel casings before it can be stably lowered, a single bottom plate is convenient for adjustment, has a small hoisting difficulty, is convenient for workers to quickly hoist, and speeds up the construction speed;

[0033] 2. When the support beam is removed, the support beam is lifted from the steel casing, and the two hinged sections rotate relative to each other, so as to escape from the steel casing through the locking holes, and then the entire support beam is separated from the steel casing. This removal method reduces the removal process of the workers, reduces the difficulty of removing the support beam, and realizes the rapid disassembly of the support beam;

[0034] 3. After the installation of the steel sheet pile is completed, angle irons are first welded on the steel sheet pile, so that the channel steel can be connected to the irregular steel sheet pile through the angle iron. Then the C-shaped member and the I-shaped member are installed and cooperate with the waterproof filler to block water at the connection cavity. Then, through the misalignment setting of the joint between the angle iron and the steel panel, the steel panel can completely cover the connection cavity. Finally, the tie rod is tightened to clamp the channel steel, thereby pressing the angle iron to squeeze the rubber water stop belt, and then realizing multiple water stops. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the overall structure of the suspension box of a steel-concrete combined suspension box structure and its construction method according to an embodiment of the present application.

[0036] Figure 2 is a top view of the suspension box of a steel-concrete combined suspension box structure and its construction method according to an embodiment of the present application.

[0037] Figure 3 It is a sectional view of the steel casing and the bottom plate unit of a steel-concrete composite lifting caisson structure for a bridge cap and its construction method in an embodiment of the present application.

[0038] Figure 4 It is Figure 2 An enlarged view of A in

[0039] Explanation of reference numerals:

[0040] 1. Concrete bottom plate; 11. Installation hole; 12. Bottom plate unit; 13. Installation groove; 14. Water bag; 2. Wall panel; 21. Fixed block; 211. Locking bolt; 22. Steel sheet pile; 221. First section of steel sheet pile; 222. Last section of steel sheet pile; 23. Angle steel; 24. Channel steel; 241. Connection cavity; 25. C-shaped member; 26. I-shaped member; 27. Angle iron; 28. Tie rod; 3. Steel casing; 31. Locking hole; 4. Support beam; 41. Hinged section; 42. Driving groove; 421. Driving block; 43. Sliding groove; 431. Reinforcing rod; 44. Elastic member; 5. Steel panel. Detailed implementation manners

[0041] The following further Figures 1-4 describes the present application in detail with reference to the attached

[0042] An embodiment of the present application discloses a steel-concrete composite lifting caisson structure for a bridge cap.

[0043] In a first aspect, referring to Figure 1 and Figure 2 , a steel-concrete composite lifting caisson structure for a bridge cap includes a circular concrete bottom plate 1 and a wall panel 2; a steel bar skeleton is embedded in the concrete bottom plate 1, and a plurality of installation holes 11 are formed in the concrete bottom plate 1. The concrete bottom plate 1 is sleeved on a steel casing 3 used in cooperation with the lifting caisson structure through the installation holes 11; referring to Figure 2 , the concrete bottom plate 1 includes a plurality of mutually spliced bottom plate units 12. The bottom plate unit 12 includes a plurality of first plates with one-sided arc shapes arranged on the outer side of the concrete bottom plate 1 and a second plate arranged on the inner side of the concrete bottom plate 1; one bottom plate unit 12 corresponds to one steel casing 3, and installation holes 11 are formed in each bottom plate unit 12 and the bottom plate unit 12 is sleeved on the corresponding steel casing 3 through the installation holes 11;

[0044] Referring to Figure 2 and Figure 3, a supporting member for supporting the bottom plate unit 12 is provided on each steel casing 3; the supporting member includes a supporting beam 4. In actual construction, according to the size of the steel casing and design requirements, the supporting beam can be multiple. In this embodiment, one supporting beam 4 is taken as an example. A pair of locking holes 31 are oppositely formed on the side walls of each steel casing 3. The two ends of the supporting beam 4 are passed through the steel casing 3 through the opposite two locking holes 31, and the side of the supporting beam 4 passing through the steel casing 3 and facing upward is used to abut against the bottom plate unit 12.

[0045] When the bottom plate unit 12 is sleeved on the steel casing 3, first, the inner second plate is sleeved on the corresponding steel casing 3 until it abuts against the supporting beam 4; second, the outer first plate is sleeved on the corresponding steel casing 3 and lowered until it abuts against the supporting beam 4; adjacent two bottom plate units 12 are connected by reinforced concrete. In this embodiment, the steel bar skeletons on each bottom plate unit 12 all reserve segments outside the bottom plate unit 12 for bundling and fixedly connecting with the wet joint steel bars. First, wet joint steel bars and bottom forms are erected between the steel bar skeletons of each bottom plate unit 12, and then concrete is poured into the bottom form to connect each bottom plate unit 12 to form a concrete bottom plate 1.

[0046] Refer to Figure 1 and Figure 2 , the wall panel 2 is fixedly installed on the concrete bottom plate 1 along the circumferential direction. The wall panel 2 extends in the vertical direction. A mortar leveling layer and a rubber cushion layer are provided on the concrete bottom plate 1. The wall panel 2 is hoisted and placed on the concrete bottom plate 1. A plurality of fixing blocks 21 are arranged at intervals along the circumferential direction on the outer side of the wall panel 2. A locking screw is threadedly installed on the fixing block 21, and one end of the locking screw passing through the fixing block 21 is threadedly connected to the concrete bottom plate 1; first, the wall panel 2 is placed on the concrete bottom plate 1, then locked on the concrete bottom plate 1 through the locking screw, and finally, sealing mortar is poured into the gap between the wall panel 2 and the concrete bottom plate 1 to fix the wall panel 2 on the concrete bottom plate 1. A steel panel 5 is fixedly installed along the circumferential direction on the side of the wall panel 2 facing the inside of the caisson.

[0047] Refer to Figure 2 and Figure 4 , the wall panel 2 includes a plurality of interconnected steel sheet piles 22. The steel sheet pile 22 includes a first-section steel sheet pile 221, an intermediate steel sheet pile 22, and a last-section steel sheet pile 222 which are connected in sequence. The intermediate steel sheet pile 22 is provided with a plurality of sections;

[0048] On one side of the first sheet pile 221 and the last sheet pile 222 that are close to each other, angle steels 23 are provided. On one side of the two angle steels 23 that are close to each other, channel steels 24 are provided. The inner notch of the channel steel 24 is fixedly connected to the corresponding angle steel 23. A connecting cavity 241 is formed between the two channel steels 24. In the connecting cavity 241, a number of pairs of C-shaped members 25 and I-shaped members 26 are provided. The sides of each pair of C-shaped members 25 that are close to each other are open, and the sides that are away from each other are fixedly connected to the sides of the two channel steels 24 that are away from the corresponding angle steels 23. Each I-shaped member 26 is inserted into the two C-shaped members 25 of the same pair through the openings of the two C-shaped members 25. Waterproof fillers are provided between each pair of C-shaped members 25.

[0049] Refer to Figure 4 , starting from the side of the sheet pile 22 that is circumferentially away from the connecting cavity 241, the steel panel 5 is welded and fixed. When the welding of the steel panel 5 is completed, angle irons 27 are welded on the C-shaped members 25 close to the steel panel 5. A rubber water stop is provided between the two angle irons 27. A tie rod 28 is provided between the two channel steels 24. The tie rod 28 passes through the two channel steels 24 at the same time. Threaded nuts are connected to the ends of the tie rod 28 that pass through the channel steels 24.

[0050] After the installation of the sheet pile 22 is completed, first, the angle steel 23 is welded on the sheet pile 22 so that the channel steel 24 can be connected to the sheet pile 22 through the angle steel 23. Then, the C-shaped member 25 is welded and the I-shaped member 26 is inserted into the two C-shaped members 25 of the same pair, and together with the waterproof filler, it functions to block water at the connecting cavity 241. Second, through the setting of the angle iron 27 and the misalignment setting of the joints of the steel panel 5, the steel panel 5 can completely cover the connecting cavity 241. Finally, the tie rod 28 is tightened so that the channel steel 24 is clamped, thereby pressing the angle iron 27 to squeeze the rubber water stop, and thus realizing multiple water stops.

[0051] Refer to Figure 3, the support beam 4 includes a pair of hinged segments 41 that are hinged to each other. The hinge point of the support beam 4 is located inside the steel casing 3 and on the downward side of the support beam 4. A strengthening assembly for enhancing the connection strength between the two hinged segments 41 is installed on the support beam 4; the strengthening assembly includes a pair of strengthening rods 431 and a pair of driving blocks 421. Each hinged segment 41 is provided with a sliding groove 43 extending along its own length direction. The two strengthening rods 431 are respectively installed on the two hinged segments 41 of the same support beam 4 in a sliding manner through the sliding grooves 43; each hinged segment 41 is communicated with a driving groove 42 at the bottom of the sliding groove 43. The driving block 421 is installed on the hinged segment 41 in a sliding manner through the driving groove 42. The upward side of the driving block 421 protrudes from the hinged segment 41 and is provided with a guiding surface. The driving block 421 abuts against the strengthening rod 431; on the side where the two hinged segments 41 of the same support beam 4 are close to each other, a connecting groove for inserting the slid strengthening rod 431 is provided; an elastic member 44 is sleeved on the strengthening rod 431. One end of the elastic member 44 is connected to the strengthening rod 431, and the other end is fixed in the sliding groove 43;

[0052] As the bottom plate unit 12 is lowered, the inner wall of the bottom plate unit 12 at the installation hole 11 abuts against the guiding surface of the driving block 421, thereby driving the driving block 421 to slide in the driving groove 42 through the guiding surface. The driving block 421 pushes the strengthening rod 431 to slide in the sliding groove 43, and then inserts into the hinged segment 41 through the connecting groove on the other hinged segment 41 of the same pair, enhancing the connection stability between the two hinged segments 41; after the connection between the bottom plate units 12 is completed, the concrete bottom plate 1 is lifted as a whole. At this time, the strengthening rod 431 is reset into the corresponding hinged segment 41 under the action of the elastic member 44, and the worker lifts the entire support beam 4 to complete the recovery of the support beam 4.

[0053] Refer to Figure 3 , each bottom plate unit 12 is provided with an installation groove 13 along the circumferential direction at the installation hole 11. A water bag 14 is arranged in the installation groove 13 of the bottom plate unit 12. The side of the water bag 14 facing the steel casing 3 abuts against the steel casing 3. Before preparing to pour concrete to form the bearing platform, water is first poured into the water bag 14 until the water bag 14 expands and abuts against the steel casing 3.

[0054] In a second aspect, the embodiments of the present application also disclose a construction method for a steel-concrete composite lifting box of a bridge bearing platform. The construction method includes:

[0055] S1: Build a construction platform at a predetermined construction position, and bury the steel casing 3 until it reaches the riverbed; precast the concrete bottom plate 1 in the factory.

[0056] S2: Transport the concrete bottom plate 1 to the predetermined construction position and sleeved it on the steel casing 3.

[0057] In step S2:

[0058] S2.1: Transport each bottom plate unit 12 to the construction location by a transport ship.

[0059] S2.2: First, form locking holes 31 on each steel casing 3, then insert the support beam 4 through the locking holes 31 and into the corresponding steel casing 3, and then sequentially sleeved each bottom plate unit 12 on the steel casing 3 and lower it until it abuts against the support beam 4.

[0060] S2.3: Lay the bottom formwork between each bottom plate unit 12 and weld the wet joint steel bars, and pour concrete to stably connect between each bottom plate unit 12.

[0061] S3: Splices each steel sheet pile 22 into multiple wall panels 2, then hoist and install them on the concrete bottom plate 1 in sequence to form a suspension box, weld fixing blocks 21 outside the steel sheet piles 22, and threadedly connect the locking screws to the fixing blocks 21 and the concrete bottom plate 1 simultaneously.

[0062] S4: Set a cantilever beam and a hydraulic jack at the top of the steel casing 3, set a shoulder beam on the concrete bottom plate 1, set a steel strand between the shoulder beam and the hydraulic jack, start the hydraulic jack to lift the suspension box, and remove the support beam 4; then start the hydraulic jack to lower the suspension box to the predetermined position; at this time, workers install formwork inside the suspension box and pour concrete to form a bearing platform.

[0063] The above are all the preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A steel-concrete combined lifting box structure for bridge pile caps, characterized in that It includes a concrete bottom plate (1) and a wall plate (2). A number of mounting holes (11) are formed in the concrete bottom plate (1). The concrete bottom plate (1) is sleeved on a steel casing (3) used in cooperation with the caisson structure through the mounting holes (11). The wall plate (2) is fixedly installed on the concrete bottom plate (1) along the circumferential direction, and the wall plate (2) extends along the vertical direction. A number of fixing blocks (21) are arranged at intervals along the circumferential direction on the outer side of the wall plate (2). A locking screw is threadedly installed on the fixing block (21), and one end of the locking screw passing through the fixing block (21) is threadedly connected to the concrete bottom plate (1). The concrete bottom plate (1) includes a number of spliced bottom plate monomers (12). The adjacent two bottom plate monomers (12) are connected by reinforced concrete. One bottom plate monomer (12) corresponds to one steel casing (3). The mounting holes (11) are formed in each bottom plate monomer (12), and each bottom plate monomer (12) is sleeved on the corresponding steel casing (3) through the mounting holes (11). A supporting member for supporting the bottom plate monomer (12) is arranged on each steel casing (3). The supporting member includes a support beam (4). Locking holes (31) are oppositely formed on the side walls of each steel casing (3). The two ends of the support beam (4) are respectively inserted into the steel casing (3) through the opposite two locking holes (31). The side of the support beam (4) protruding out of the steel casing (3) and facing upward is used to abut against the bottom plate monomer (12). The support beam (4) includes a pair of hinged segments (41) that are rotatably connected to each other. The hinge point of the support beam (4) is located inside the steel casing (3). A strengthening component for strengthening the connection strength between the two hinged segments (41) is installed on the support beam (4). The strengthening component includes a pair of strengthening rods (431) and a pair of driving blocks (421). Each hinged segment (41) is provided with a sliding groove (43) extending along its own length direction. The two strengthening rods (431) are respectively installed on the two hinged segments (41) of the same support beam (4) in a sliding manner through the sliding grooves (43). A driving groove (42) is communicated with the bottom of the sliding groove (43) in each hinged segment (41). The driving block (421) is installed on the hinged segment (41) in a sliding manner through the driving groove (42). The upward side of the driving block (421) protrudes out of the hinged segment (41) and is provided with a guiding surface. The driving block (421) abuts against the strengthening rod (431). Connecting grooves for inserting the slid strengthening rods (431) are formed on the side of the two hinged segments (41) of the same support beam (4) close to each other. An elastic member (44) is sleeved on the strengthening rod (431). One end of the elastic member (44) is connected to the strengthening rod (431), and the other end is fixed in the sliding groove (43).

2. The steel-concrete combined suspension box structure for bridge cap according to claim 1, characterized in that, Each of the bottom plate units (12) is provided with an installation groove (13) along the circumferential direction at the installation hole (11). The bottom plate unit (12) is provided with a water bag (14) in the installation groove (13), and one side of the water bag (14) facing the steel casing (3) abuts against the steel casing (3).

3. The steel-concrete combined lifting box structure for bridge cap according to claim 1, characterized in that The wall panel (2) includes a plurality of interconnected steel sheet piles (22). The steel sheet piles (22) include a first-section steel sheet pile (221), an intermediate steel sheet pile (22), and a last-section steel sheet pile (222) which are connected in sequence. A plurality of sections of the intermediate steel sheet pile (22) are provided; Angle steels (23) are provided on the sides of the first-section steel sheet pile (221) and the last-section steel sheet pile (222) close to each other. Channels (24) are provided on the sides of the two angle steels (23) close to each other. The inner notch of the channel (24) is fixedly connected to the corresponding angle steel (23). A connection cavity (241) is formed between the two channels (24). A plurality of pairs of C-shaped members (25) and I-shaped members (26) are provided in the connection cavity (241). The sides of each pair of C-shaped members (25) close to each other are open, and the sides away from each other are fixedly connected to the sides of the two channels (24) away from the corresponding angle steel (23). Each I-shaped member (26) is inserted into the two C-shaped members (25) through the openings of the two C-shaped members (25) in the same pair; Waterproof fillers are provided between each pair of the C-shaped members (25).

4. A steel-concrete composite lifting caisson structure for bridge cap according to claim 1, characterized in that, A steel panel (5) is fixedly installed along the circumferential direction on the side of the wall panel (2) facing the inside of the hanging box.

5. A construction method, based on a steel-concrete composite lifting box structure for a bridge cap described in any one of claims 1-4, characterized in that The construction method includes: S1: Build a construction platform and bury the steel casing (3) at a predetermined construction position, and precast a concrete bottom plate (1); S2: Transport the concrete bottom plate (1) to the predetermined construction position and sleeved it on the steel casing (3); S3: Install the wall panel (2) on the concrete bottom plate (1) to form a hanging box body; S4: Install a formwork inside the hanging box body and pour concrete to form a bearing platform.

6. A construction method according to claim 5, characterized in that, In step S3, after the installation of the C-shaped member (25) is completed, start welding and fixing the steel panel (5) on the side of the steel sheet pile (22) away from the connection cavity (241) in the circumferential direction. When the welding of the steel panel (5) is completed, weld angle irons (27) on the C-shaped member (25) close to the steel panel (5). A rubber water stop plate is provided between the two angle irons (27). A tie rod (28) is provided between the two channels (24). The tie rod (28) passes through the two channels (24) at the same time. Threaded tie nuts are connected to the ends of the tie rod (28) passing through the channels (24).

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