Construction Method of Main Bearing Bracket System of Steel Box Girder in Water

Abstract

The present invention relates to a construction method for a main bearing support system of a steel box girder in water, including the steps of: removing the inner bridge railing; erecting a temporary support; constructing a construction guiding device for a steel pipe pile on the bridge deck; installing an installation and disassembly auxiliary positioning device; erecting a main bearing support system of a steel box girder in water; installing an elevation-adjustable column cap; installing a transverse I-beam distribution beam; installing an elevation-adjustable pad seat; installing a steel box girder; and removing the steel pipe pile. The beneficial effects of the present invention are as follows: By adopting a quick connection device for the transverse I-beam distribution beam and the column cap, the quick disassembly and assembly of the elevation-adjustable column cap and the distribution beam can be realized, greatly improving the construction efficiency; by adopting a quick connection device for the steel pipe pile and using the combination technology of a positioning mechanical hoop connecting piece and a plug-and-play screw rod, the assembly and positioning of the steel pipe pile can be realized, shortening the construction period, improving the construction safety at the same time, ensuring the stability and safety of the main bearing support system, and having broad application prospects.

Description

Technical Field

[0001] The present invention belongs to the field of civil engineering, and particularly relates to a construction method for the main bearing support system of a steel box girder in water, which is applicable to various water environments, such as rivers, lakes, etc., and can meet the construction requirements of the main bearing support system of the box girder in water under different environments. Background Art

[0002] A steel box girder is a commonly used bridge structure. When it is constructed in water, a main bearing support system needs to be adopted to ensure its stability and safety. The main bearing support system is composed of multiple supports, which can bear the weight of the bridge and prevent the bridge from deforming, displacing, etc. under the influence of the external environment during the construction process.

[0003] The main bearing support system is composed of multiple supports, mainly including transverse supports, longitudinal supports, diagonal bracing supports, temporary suspension supports, etc. These supports can bear the weight of the bridge and prevent the bridge from deforming, displacing, etc. under the influence of the external environment during the construction process. The main bearing support system has the characteristics of simple structure, high reliability, high construction efficiency, etc., and is an important part of the steel box girder construction in water.

[0004] The construction methods of the main bearing support system of the steel box girder in water include two types: suspension type and support type. The suspension type construction method is to first suspend the main bearing support system above the pier, then hoist the steel box girder onto the support, and finally construct the lower structure. The support type construction method is to first support the main bearing support system under the pier, place the steel box girder flat on the support, and then construct the lower structure. Both construction methods need to consider underwater environmental factors, such as water flow, water level, etc., to ensure the stability and safety of the main bearing support system.

[0005] Therefore, how to achieve the safe construction of the main bearing support system of the steel box girder in water is crucial, which is the key technology of on-site construction and the key points and difficulties of the whole construction. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a construction method for the main bearing support system of a steel box girder in water.

[0007] This construction method for the main bearing support system of the steel box girder in water includes the following steps:

[0008] Step 1: Construct a concrete base on the top of the bridge deck, then weld the embedded steel plate and the support steel pipe, and install a horizontal support plate and a connecting support on the top of the support steel pipe;

[0009] Step 2: Install a construction guide platform between the bridge decks, install a traction winch on the top of the construction guide platform, and use the traction winch to lower the suspended construction platform to the construction position; install a support plate and an auxiliary positioning device on the top of the construction guide platform;

[0010] Step 3: construct steel pipe piles in water and connect them with steel pipe piles through steel pipe pile quick connection devices; at the same time, use the installation auxiliary positioning device to lower the cross brace; install the height-adjustable column cap on the top of the steel pipe pile, and adjust the elevation with the tie rod;

[0011] Step 4: Install the transverse I-beam distribution beam between the clamping plates, insert the telescopic rod into the fixing tube to fix it, place the telescopic spring on the top of the transverse I-beam distribution beam, and adjust the height of the height-adjustable cushion seat by using a jack;

[0012] Step 5: Place the steel box girder on top of the height-adjustable pad; use the steel pipe piles to remove the bridge deck construction guide device to dismantle the steel pipe piles.

[0013] Preferably, in step one: an embedded steel plate is provided on the top of the concrete base, and welded steel bars are provided under the embedded steel plate; the supporting steel pipe is connected to the embedded steel plate through angle steel, and the joints of the supporting steel pipes are connected by flange fixing bolts; the supporting steel pipes are connected by horizontal braces and diagonal braces, a connecting support is provided on the top of the supporting steel pipe, a horizontal support plate is provided on the top of the connecting support, a vertical support is provided on the top of the horizontal support plate, and a diagonal support is provided between the horizontal support plate and the vertical support.

[0014] Preferably, in step 2: the construction guide platform is installed by first constructing a platform base on the top of the bridge deck, then installing a platform upright on the platform base, and then installing the construction guide platform on the top of the platform upright;

[0015] A support plate is provided between the construction guide platforms, and the auxiliary positioning device is arranged at the top center of the support plate; a suspension wire rope is provided below the auxiliary positioning device, and a fixed sleeve is connected to the suspension wire rope through a lifting ring below, and a support rod is supported below the horizontal support, and the support rod is connected as a whole through a fixed sleeve, and the support rod and the horizontal support are fixed by step-by-step tightening.

[0016] Preferably, in step three: the steel pipe pile quick connection device includes an arc-shaped pressure plate, bolts, a positioning mechanical clamp and a plug-in screw. When two steel pipe piles are butt-jointed with each other, the positioning mechanical clamp is welded to the top of the steel pipe pile at the lower part of the butt joint, and the arc-shaped pressure plate is installed on the outside of the steel pipe pile, and the arc-shaped pressure plate is fixed by bolts and plug-in screws; cross braces are provided between the steel pipe piles to form a longitudinal and transverse connection system, and oblique connecting braces are provided between the cross braces.

[0017] Preferably, in step three: the elevation-adjustable column cap is arranged on the top of the steel pipe pile. Reserved holes for the tension rods are provided at both ends of the elevation-adjustable column cap. The tension rods are fixed on the elevation-adjustable column cap through the screws of the tension rods. A horizontal fixing rod is connected to the bottom of the tension rod through a clamping screw, and the horizontal fixing rod is fixed on the top of the steel pipe pile through a fixing bolt; symmetrically arranged fixing cylinders are provided at both ends of the top of the elevation-adjustable column cap. Telescopic rods are inserted into the fixing cylinders. Fixing screws respectively pass through the fixing cylinders and the perforations and are fixed with nuts. Clamping plates are symmetrically arranged at the center of the top of the elevation-adjustable column cap.

[0018] Preferably, in step four: the transverse I-beam distribution beam is clamped between the clamping plates and fixed with fixing screws and the fixing nuts of the screws; a telescopic spring is arranged on the top of the transverse I-beam distribution beam. The fixing screws respectively pass through the clamping plates and the transverse I-beam distribution beam;

[0019] The elevation-adjustable cushion block is arranged on the top of the transverse I-beam distribution beam. A telescopic spring is provided in the center below the elevation-adjustable cushion block. Jacks are symmetrically arranged on both sides below the elevation-adjustable cushion block. The jacks are connected with telescopic rods, and perforations are provided below the telescopic rods; the elevation-adjustable column cap is arranged on the top of the steel pipe pile. Reserved holes for the tension rods are provided at both ends of the elevation-adjustable column cap. The tension rods are fixed on the elevation-adjustable column cap through the screws of the tension rods. A horizontal fixing rod is connected to the bottom of the tension rod through a clamping screw, and the horizontal fixing rod is fixed on the top of the steel pipe pile through a fixing bolt.

[0020] Preferably, in step five: the steel pipe pile extraction bridge deck construction guiding device includes a crane. The crane is arranged on the bridge decks on both sides. When the steel pipe pile is extracted, the construction guiding platform is the steel pipe pile extraction construction platform; a hook is provided below the lifting rod of the crane. A steel wire rope is connected to the hook, and a vibration hammer is provided on the top of the steel pipe pile to be extracted.

[0021] The main bearing force support system of the steel box girder in water is obtained by any one of the above methods.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1) The present invention adopts the steel pipe pile bridge deck construction guiding device, and uses the construction guiding platform placed on the bridge deck to realize temporary enclosure and construction platform erection, avoiding potential safety problems during the construction process and reducing the interference to the water area under the bridge at the same time.

[0024] 2) The present invention adopts the quick connection device of the transverse I-beam distribution beam and the column cap, which can realize the quick disassembly and assembly of the elevation-adjustable column cap and the distribution beam, greatly improving the construction efficiency and having broad application prospects.

[0025] 3) The present invention adopts a rapid connection device for steel pipe piles, and by using the combined technology of positioning mechanical clamping connectors and plug-and-play screws, the assembly and positioning of steel pipe piles can be realized, shortening the construction period, reducing the cost, improving the economic benefits, and at the same time enhancing the construction safety.

[0026] 4) The present invention adopts a column cap with adjustable elevation and a pedestal with adjustable elevation, which can realize the height adjustment of the column cap and the pedestal, can adjust the bridge elevation according to the actual situation, ensure that the structure meets the design requirements, and can be flexibly adjusted according to the actual situation, avoiding problems such as elevation deviation during the construction process, reducing the construction difficulty and construction period, and ensuring the construction safety and stability of the structure. Description of the Drawings

[0027] Figure 1 is the construction schematic diagram of the main bearing support system for the steel box girder in water;

[0028] Figure 2 is the structural schematic diagram of the main bearing support system for the steel box girder in water;

[0029] Figure 3 is the schematic diagram of the fixed base of the construction platform;

[0030] Figure 4 is the construction plan view of the main bearing support system for the steel box girder in water;

[0031] Figure 5 is the plan view of the lower structure of the main bearing support system for the steel box girder in water;

[0032] Figure 6 is the plan schematic diagram of the column cap with adjustable elevation and the pedestal with adjustable elevation;

[0033] Figure 7 is the three-dimensional schematic diagram of the column cap with adjustable elevation and the pedestal with adjustable elevation;

[0034] Figure 8 is the three-dimensional construction schematic diagram of the column cap with adjustable elevation and the I-beam distribution beam;

[0035] Figure 9 is the left view of the column cap with adjustable elevation and the pedestal with adjustable elevation;

[0036] Figure 10 is the front view of the column cap with adjustable elevation and the pedestal with adjustable elevation;

[0037] Figure 11 is the plan view of the column cap with adjustable elevation and the I-beam distribution beam;

[0038] Figure 12 is the three-dimensional schematic diagram of the pedestal with adjustable elevation;

[0039] Figure 13 is the front view of the pedestal with adjustable elevation;

[0040] Figure 14 It is a construction schematic diagram of the construction guiding device for pulling out steel pipe piles from the bridge deck.

[0041] In the figure: 1 - bridge deck, 2 - concrete base, 3 - embedded steel plate, 4 - support steel pipe, 5 - flange fixing bolt, 6 - construction guiding platform, 7 - vertical support, 8 - diagonal support, 9 - towing steel wire rope, 10 - support plate, 11 - auxiliary positioning device, 12 - elevation adjustable column cap, 13 - transverse I-beam distribution beam, 14 - elevation adjustable cushion seat, 15 - steel pipe pile, 16 - suspension steel wire rope, 17 - towing winch, 18 - horizontal support plate, 19 - connecting support, 20 - cross brace, 21 - steel box girder, 22 - horizontal brace, 23 - diagonal connecting brace, 24 - diagonal brace, 25 - welded steel bar, 26 - angle steel, 27 - suspended construction platform, 28 - sliding fixed ring, 29 - guardrail, 30 - pressing plate, 31 - reserved groove, 32 - platform base, 33 - embedded screw, 34 - fixing nut, 35 - welded part, 36 - platform vertical pole, 37 - steel wire rope, 38 - hook, 39 - lifting rod, 40 - crane, 41 - lifting ring, 42 - fixed sleeve, 43 - support rod, 44 - fixing screw, 45 - fixing rod, 46 - nut, 47 - telescopic spring, 48 - telescopic rod, 49 - clamping plate, 50 - jack, 51 - fixed screw rod, 52 - fixing nut of the screw rod, 53 - fixed cylinder, 54 - fixing bolt, 55 - screw of the fixing rod, 56 - horizontal fixing pull rod, 57 - arc pressing plate, 58 - bolt, 59 - positioning mechanical clamping part, 60 - plug-in screw rod, 61 - clamping screw, 62 - step-by-step tightener, 63 - perforation. Specific implementation mode

[0042] The following further describes the present invention in combination with embodiments. The description of the following embodiments is only for helping to understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0043] Embodiment 1

[0044] As an embodiment, a construction method of a main bearing support system for a steel box girder in water includes the following steps:

[0045] Step 1: Demolish the inner railing of the bridge: Before constructing the main bearing support system for the steel box girder 21 in water, it is necessary to first demolish the guardrail 29 on the inner side of the top of the bridge deck 1;

[0046] Installation of temporary support: Construct a concrete base 2 on the top of the bridge deck 1, then weld the embedded steel plate 3 and the support steel pipe 4, then weld the horizontal braces 22 and the diagonal braces 24 between the support steel pipes 4, and install a horizontal support plate 18 and a connecting support 19 on the top of the support steel pipes 4;

[0047] Step 2. Construction of the guiding device for the steel pipe pile bridge deck construction: First, construct a platform base 32 on the top of the bridge deck 1, then install the platform vertical poles 36 on the platform base 32, install the construction guiding platform 6 on the top of the platform vertical poles 36, install the traction winch 17 on the top of the construction guiding platform 6, and then use the traction winch 17 to lower the suspended construction platform 27 to the construction position;

[0048] Installation of the disassembly and assembly auxiliary positioning device 11: Install a support plate 10 on the top of the construction guiding platform 6, and install the auxiliary positioning device 11 on the top of the support plate 10;

[0049] Step 3. Erection of the main bearing support system for the steel box girder in water: Construct steel pipe piles 15 in water, use a positioning mechanical clamping device 59 to position the butt joint of the steel pipe piles 15, and use an arc-shaped pressing plate 57, bolts 58, and plug-in screw rods 60 to fix the splicing joint of the steel pipe piles 15; At the same time, use the installation auxiliary positioning device 11 to lower the cross braces 20 and weld them in place, and weld the diagonal connecting braces 23 between the cross braces 20;

[0050] Installation of the elevation-adjustable column cap:

[0051] Install an elevation-adjustable column cap 12 on the top of the steel pipe pile 15, and use a fixing rod 45 to fix the elevation-adjustable column cap 12 on the horizontal fixing rod 56 at the top of the steel pipe pile 15. At the same time, adjust the elevation of the elevation-adjustable column cap 12 through the fixing rod 45;

[0052] Step 4. Installation of the transverse I-beam distribution beam: Install the transverse I-beam distribution beam 13 between the clamping plates 49, and use the fixing screw 51 and the fixing nut 52 of the screw rod to stabilize it;

[0053] Installation of the elevation-adjustable cushion seat: Insert the telescopic rod 48 into the fixed cylinder 53, and then fix it with the fixing screw 44 and the nut 46. At the same time, place the telescopic spring 47 on the top of the transverse I-beam distribution beam 13, and adjust the length of the telescopic rod 48 through the jack 50 to adjust the elevation of the elevation-adjustable cushion seat 14;

[0054] Step 5. Installation of the steel box girder: Use a transport crane to place the steel box girder 21 on the top of the vertical support 7 and the elevation-adjustable cushion seat 14;

[0055] Demolition of the steel pipe pile: After the installation of the steel box girder 21 is completed, demolish the main bearing support system for the steel box girder 21 in water, and at the same time use the steel pipe pile 15 to remove the bridge deck construction guiding device to demolish the steel pipe pile 15.

[0056] Example Two

[0057] As another example, the main bearing support system for the steel box girder in water obtained by the method in Example One is as Figures 1 to 14 shown, including: bridge deck 1, concrete base 2, embedded steel plate 3, support steel pipe 4, flange fixing bolt 5, construction guiding platform 6, vertical support 7, diagonal support 8, traction steel wire rope 9, support plate 10, auxiliary positioning device 11, elevation adjustable column cap 12, transverse I-beam distribution beam 13, elevation adjustable cushion seat 14, steel pipe pile 15, suspension steel wire rope 16, traction winch 17, horizontal support plate 18, connection support 19, cross brace 20, steel box girder 21, horizontal brace 22, diagonal connection brace 23, diagonal brace 24, welded steel bar 25, angle steel 26, suspended construction platform 27, sliding fixed ring 28, guardrail 29, pressing plate 30, reserved groove 31, platform base 32, embedded screw 33, fixing nut 34, welded part 35, platform vertical rod 36, steel wire rope 37, hook 38, lifting rod 39, crane 40, lifting ring 41, fixed sleeve 42, support rod 43, fixing screw 44, tension rod 45, nut 46, telescopic spring 47, telescopic rod 48, clamping plate 49, jack 50, fixing screw rod 51, fixing nut of screw rod 52, fixed cylinder 53, fixing bolt 54, screw of tension rod 55, horizontal fixed tension rod 56, arc pressing plate 57, bolt 58, positioning mechanical clamping piece 59, plug-in screw rod 60, clamping screw 61, step-by-step tightener 62, perforation 63;

[0058] It also involves the following devices: steel pipe pile bridge deck construction guiding device, steel pipe pile extraction bridge deck construction guiding device, steel pipe pile quick connection device, steel pipe pile longitudinal and transverse connection system installation and disassembly auxiliary positioning device, transverse I-beam distribution beam-column cap quick connection device;

[0059] The steel pipe pile bridge deck construction guiding device mainly consists of a construction guiding platform 6, a pressing plate 30, a platform base 32, and a platform vertical rod 36. The steel pipe pile 15 bridge deck construction guiding device straddles the bridge decks 1 on both sides, and realizes temporary enclosure by using the construction guiding platform 6 placed on the bridge deck 1; the platform base 32 is arranged on the top of the bridge deck 1, a reserved groove 31 is provided in the center of the top of the platform base 32, and embedded screws 33 are provided on both sides of the top of the platform base 32; the bottom of the construction guiding platform 6 is provided with a platform vertical rod 36, and a pressing plate 30 is welded to the bottom of the platform vertical rod 36 through a welded part 35; the bottom of the platform vertical rod 36 is inserted into the reserved groove 31, and after the pressing plate 30 is butted with the embedded screw 33, it is fixed with a fixing nut 34; traction winches 17 are symmetrically arranged on both sides of the top of the construction guiding platform 6, the traction winches 17 are connected with a traction steel wire rope 9, and the lower part of the traction steel wire rope 9 is connected with a sliding fixed ring 28, and the sliding fixed ring 28 is arranged on the top of the suspended construction platform 27.

[0060] The described construction guiding device for pulling out steel pipe piles from the bridge deck mainly consists of a construction guiding platform 6 and a crane 40. The crane 40 is arranged on the bridge decks 1 on both sides. The construction guiding platform 6 serves as the construction platform for pulling out the steel pipe piles 15. A hook 38 is provided below the lifting rod 39 of the crane 40, and a steel wire rope 37 is connected to the hook 38. A vibration hammer is provided at the top of the steel pipe pile 15 to be pulled out.

[0061] The described quick connection device for steel pipe piles mainly consists of an arc-shaped pressing plate 57, bolts 58, a positioning mechanical clamping member 59, and an inserting and pulling screw rod 60. The positioning mechanical clamping member 59 is welded to the top of the lower steel pipe pile 15 at the butt joint. The arc-shaped pressing plate 57 is installed on the outside of the steel pipe pile 15 at the butt joint and is fixed with bolts 58 and the inserting and pulling screw rod 60.

[0062] The described auxiliary positioning device 11 for the longitudinal and transverse connection system of steel pipe piles mainly includes: an auxiliary positioning device 11 and a fixed sleeve 42. The longitudinal and transverse connection system of the steel pipe piles 15 consists of cross braces 20, and diagonal connecting braces 23 are provided between the cross braces 20. The auxiliary positioning device 11 is arranged at the center of the top of the support plate 10, and the support plate 10 is placed on the centers of the tops on both sides. A suspension steel wire rope 16 is provided below the auxiliary positioning device 11, and the lower part of the suspension steel wire rope 16 is connected to a lifting ring 41. The lifting ring 41 is arranged at the top of the fixed sleeve 42, and the support rods 43 are connected as a whole through the fixed sleeve 42. The ends of the support rods 43 are supported below the horizontal brace 22 and are fixed with step tighteners 62.

[0063] The described elevation-adjustable column cap 12 is arranged at the top of the steel pipe pile 15. Reserved holes for the tension rods 45 are provided at both ends of the elevation-adjustable column cap 12. The tension rods 45 are fixed to the elevation-adjustable column cap 12 through the screws 55 of the tension rods. The bottom of the tension rod 45 is fixed to the horizontal fixed tension rod 56 through the clamping screw 61. The horizontal fixed tension rod 56 is fixed near the top of the steel pipe pile 15 through the fixing bolt 54. Symmetrically arranged fixed cylinders 53 are provided at both ends of the top of the elevation-adjustable column cap 12. The telescopic rod 48 is inserted into the fixed cylinder 53, and the fixing screws 44 respectively pass through the fixed cylinder 53 and the through hole 63 and are fixed with nuts 46.

[0064] The described elevation-adjustable cushion block 14 is arranged on the top of the transverse I-beam distribution beam 13. A telescopic spring 47 is provided at the center below the elevation-adjustable cushion block 14. Jacks 50 are symmetrically arranged on both sides below the elevation-adjustable cushion block 14. The jacks 50 are connected to the telescopic rod 48, and a through hole 63 is provided below the telescopic rod 48. The telescopic spring 47 is supported on the top of the transverse I-beam distribution beam 13. The fixing screws 51 respectively pass through the clamping plate 49 and the transverse I-beam distribution beam 13 and are fixed with the fixing nuts 52 of the screws.

[0065] The described quick connection device for the transverse I-beam distribution beam and column cap is mainly composed of a clamping plate 49 and a fixing screw 51. The clamping plates 49 are symmetrically arranged at the center of the top of the elevation-adjustable column cap 12. The transverse I-beam distribution beam 13 is clamped between the clamping plates 49 and fixed with the fixing screw 51 and the fixing nut 52 of the screw.

[0066] A concrete base 2 is further provided on the top of the bridge deck 1. An embedded steel plate 3 is provided on the top of the concrete base 2, and welded steel bars 25 are provided below the embedded steel plate 3. The support steel pipe 4 is connected to the embedded steel plate 3 through an angle steel 26, and the splicing part of the support steel pipe 4 is fixed by a flange fixing bolt 5. The support steel pipes 4 are connected by a horizontal brace 22 and a diagonal brace 24. A connecting support 19 is provided at the top of the support steel pipe 4. A horizontal support plate 18 is provided at the top of the connecting support 19. A vertical support 7 is provided at the top of the horizontal support plate 18. An inclined support 8 is provided between the horizontal support plate 18 and the vertical support 7. The vertical support 7 and the adjustable cushion block 14 support the steel box girder 21 at the top.

Claims

1. A construction method for a main bearing support system of a steel box girder in water, characterized in that It includes the following steps: Step 1: Construct a concrete base (2) on the top of the bridge deck (1), then weld the embedded steel plate (3) and the support steel pipe (4), and install a horizontal support plate (18) and a connecting support (19) on the top of the support steel pipe (4); Step 2: Install a construction guiding platform (6) between the bridge decks (1), install a traction winch (17) on the top of the construction guiding platform (6), and use the traction winch (17) to lower the suspended construction platform (27) to the construction position; install a support plate (10) and an auxiliary positioning device (11) on the top of the construction guiding platform (6); Step 3: Construct steel pipe piles (15) in the water and connect the steel pipe piles (15) through a quick connection device for steel pipe piles; at the same time, lower the cross brace (20) by using the installed auxiliary positioning device (11); install an elevation adjustable column cap (12) on the top of the steel pipe pile (15) and adjust the elevation with a tension rod (45); reserved holes for the tension rod (45) are provided at both ends of the elevation adjustable column cap (12), and the tension rod (45) is fixed to the elevation adjustable column cap (12) through the screws (55) of the tension rod. The bottom of the tension rod (45) is connected with a horizontal fixed tension rod (56) through a clamping screw (61), and the horizontal fixed tension rod (56) is fixed to the top of the steel pipe pile (15) through a fixing bolt (54); fixed cylinders (53) are symmetrically provided at both ends of the top of the elevation adjustable column cap (12), telescopic rods (48) are inserted into the fixed cylinders (53), fixing screws (44) pass through the fixed cylinders (53) and the through holes (63) respectively and are fixed with nuts (46), and clamping plates (49) are symmetrically arranged at the center of the top of the elevation adjustable column cap (12); Step 4: Install a transverse I-beam distribution beam (13) between the clamping plates (49), insert the telescopic rod (48) into the fixed cylinder (53) for fixation, place a telescopic spring (47) on the top of the transverse I-beam distribution beam (13), and adjust the elevation of the elevation adjustable pad (14) through a jack (50); the transverse I-beam distribution beam (13) is clamped between the clamping plates (49) and fixed with fixing screws (51) and fixing nuts (52) of the screws; a telescopic spring (47) is provided on the top of the transverse I-beam distribution beam (13), and the fixing screws (51) pass through the clamping plates (49) and the transverse I-beam distribution beam (13) respectively; The described elevation-adjustable pedestal (14) is provided on the top of the transverse I-beam distribution beam (13). A telescopic spring (47) is provided in the center below the elevation-adjustable pedestal (14). Jacks (50) are symmetrically provided on both sides below the elevation-adjustable pedestal (14). The jacks (50) are connected with telescopic rods (48), and a perforation (63) is provided below the telescopic rods (48). The elevation-adjustable column cap (12) is provided on the top of the steel pipe pile (15). Reserved holes for the tension rods (45) are provided at both ends of the elevation-adjustable column cap (12). The tension rods (45) are fixed on the elevation-adjustable column cap (12) through the screws (55) of the tension rods. The bottom of the tension rods (45) is connected with a horizontal fixed tension rod (56) through clamping screws (61). The described horizontal fixed tension rod (56) is fixed on the top of the steel pipe pile (15) through fixing bolts (54). Step Five: Place the steel box girder (21) on the top of the elevation-adjustable pedestal (14); use the steel pipe pile removal bridge deck construction guiding device to remove the steel pipe piles (15).

2. The construction method of the main bearing support system of the steel box girder in water according to claim 1, characterized in that, In Step One: An embedded steel plate (3) is provided on the top of the concrete base (2), and welded steel bars (25) are provided below the embedded steel plate (3). The support steel pipe (4) is connected to the embedded steel plate (3) through angle steels (26). The splicing joints of the support steel pipes (4) are connected through flange fixing bolts (5). The support steel pipes (4) are connected through horizontal braces (22) and diagonal braces (24). A connection support (19) is provided on the top of the support steel pipe (4), a horizontal support plate (18) is provided on the top of the connection support (19), a vertical support (7) is provided on the top of the horizontal support plate (18), and an inclined support (8) is provided between the horizontal support plate (18) and the vertical support (7).

3. The construction method of the main bearing support system of the steel box girder in water according to claim 2, characterized in that, In Step Two: The installation method of the construction guiding platform (6) is as follows. First, construct a platform base (32) on the top of the bridge deck (1), then install platform vertical poles (36) on the platform base (32), and install the construction guiding platform (6) on the top of the platform vertical poles (36). Support plates (10) are provided between the construction guiding platforms (6). The auxiliary positioning device (11) is provided in the center on the top of the support plate (10). A suspension steel wire rope (16) is provided below the auxiliary positioning device (11). A fixed sleeve (42) is connected below the suspension steel wire rope (16) through a lifting ring (41). A support rod (43) is supported below the horizontal brace (22). The support rods (43) are connected into a whole through the fixed sleeve (42). The support rods (43) and the horizontal brace (22) are fixed through step-by-step clamps (62).

4. The construction method of the main bearing support system of the steel box girder in water according to claim 1, characterized in that, In Step 3: The rapid steel pipe pile connection device includes an arc-shaped pressing plate (57), bolts (58), a positioning mechanical hoop member (59), and a plug-and-play screw rod (60). When two steel pipe piles (15) are butt-jointed, the positioning mechanical hoop member (59) is welded to the top of the steel pipe pile (15) at the lower part of the butt-joint. The arc-shaped pressing plate (57) is installed on the outside of the steel pipe pile (15), and the arc-shaped pressing plate (57) is fixed by bolts (58) and the plug-and-play screw rod (60); a cross brace (20) is provided between the steel pipe piles (15) to form a longitudinal and transverse connection system, and an inclined connecting brace (23) is provided between the cross braces (20).

5. The construction method of the main bearing bracket system of the steel box girder in water according to claim 1, characterized in that, In Step 5: The steel pipe pile extraction bridge deck construction guiding device includes a crane (40). The crane (40) is arranged on the bridge decks (1) on both sides. When extracting the steel pipe pile (15), the construction guiding platform (6) serves as the construction platform for extracting the steel pipe pile (15); a hook (38) is provided below the lifting rod (39) of the crane (40), a steel wire rope (37) is connected to the hook (38), and a vibrating hammer is provided at the top of the steel pipe pile (15) to be extracted.

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