A support structure for the bottom formwork of a cast-in-place bridge deck and its application method

Abstract

This invention discloses a support structure and method for bottom formwork of cast-in-place bridge deck, belonging to the field of bridge construction technology. The support structure includes two main support beams arranged in parallel, and further includes: a bracket slidably connected to the outside of the main support beams, with a height adjustment mechanism on the main support beams for adjusting the height of the bracket; a cross brace channel steel, mounted on the bracket and placed perpendicular to it; multiple sleepers equidistantly distributed on the cross brace channel steel, with templates mounted on the sleepers; and a first diagonal brace, the lower side of the main support beam rotatably connected to the first diagonal brace via a first pin, with the end of the first diagonal brace away from the main support beam connected to the lower side of the cross brace channel steel. This invention, by adjusting the bracket height using a screw, can automatically adjust the support angle of the diagonal brace, making operation simple and quick, effectively improving bridge construction efficiency and facilitating a shorter bridge construction cycle.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a bottom formwork support structure for cast-in-place bridge decks and its usage method. Background Technology

[0002] Steel-concrete composite beams are a new type of structural design developed based on steel and concrete structures. They primarily utilize shear connectors (such as studs, channel steel, and bent bars) between the steel beams and concrete flanges to resist uplift and relative slippage at the interface, ensuring they function as a unified whole. The bridge deck of a steel-concrete composite beam is the load-bearing structure that directly bears the wheel pressure of vehicles. The deck is typically integrally connected to the beam ribs and diaphragms of the main beam, thus transferring the wheel pressure to the main beam while also forming part of the main beam's cross-section and ensuring the overall performance of the main beam. The bridge deck of a steel-concrete composite beam is generally made of reinforced concrete and can be prestressed laterally. During pouring, the bottom formwork of the bridge deck requires support.

[0003] Existing bridge deck construction support structures are complex, with cumbersome and time-consuming installation steps, high costs, long construction periods, and high safety risks. In the prior art, patent application number CN201921140249.7 discloses a support device for cast-in-place bridge decks of composite beams, including two parallel main support beams, a sliding plate supporting the cast-in-place bridge deck, square timber supported under the sliding plate, upper channel steel supported under the square timber, an adjustable rod between the upper channel steel and the main support beams, a bottom channel steel welded to the main support beam below the adjustable rod, and opposing diagonal braces between the bottom and upper channel steel, with reinforcing bars fixed to the upper channel steel. This application utilizes the structural frame composed of rods to effectively support the cast-in-place bridge deck of the steel-concrete composite beam. However, in actual operation, when adjusting the height of the top support by screw, it is still necessary to manually adjust the angle of the diagonal bracing between the bottom channel steel and the upper channel steel, which is still cumbersome and not conducive to improving construction efficiency. At the same time, it is only supported by one diagonal bracing on one side, which makes the overall structural stress condition still poor and the safety of construction operations needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing a bottom formwork support structure for cast-in-place bridge decks and its usage method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A bottom formwork support structure for cast-in-place bridge deck includes two main support beams arranged in parallel, and further includes:

[0007] The bracket is slidably connected to the outside of the main support beam, and the main support beam is provided with a height adjustment mechanism for adjusting the height of the bracket;

[0008] A cross bracing channel steel is provided on the bracket and placed perpendicular to the bracket;

[0009] The sleepers are provided in multiples and are equidistantly distributed on the cross bracing channel steel, and templates are provided on the sleepers;

[0010] And the first diagonal brace, the lower side of the main support beam is rotatably connected to the first diagonal brace through the first pin, and the end of the first diagonal brace away from the main support beam is connected to the lower side of the cross brace channel steel;

[0011] The height adjustment mechanism is equipped with an adjustment component for adjusting the tilt angle of the first diagonal brace.

[0012] Preferably, the height adjustment mechanism includes a support plate fixedly connected to the main support beam, an upper screw rotatably connected to the support plate, and a threaded tube threadedly connected to the upper screw. The end of the threaded tube away from the support plate is fixedly connected to the bracket.

[0013] Preferably, the adjustment assembly includes a lower screw connected to the lower side of the upper screw, a sleeve threadedly connected to the lower screw, a connecting frame connected to the sleeve, a support rod disposed on the connecting frame, and an adjustment part connected to the support rod and disposed on the first diagonal brace.

[0014] Preferably, the adjusting part includes a first sleeve rotatably connected to the support rod and slidably connected to the outside of the first diagonal brace, a first elastic element connected to the first sleeve, and a first annular plate connected to the end of the first elastic element away from the first sleeve. The first annular plate is fixedly connected to the first diagonal brace, and a first sliding seat is fixedly provided on the top of the first diagonal brace. A groove for sliding the first sliding seat is provided on the cross brace channel steel.

[0015] Preferably, the lower side of the main support beam is rotatably connected to a second diagonal brace via a second pin, and the end of the second diagonal brace away from the main support beam is connected to the lower side of the cross brace channel steel.

[0016] Preferably, a reinforcing rod is rotatably connected to the support rod via a pin. The end of the reinforcing rod away from the support rod is connected to a second sleeve that slides on the outside of the second diagonal brace, a second elastic element connected to the second sleeve, and a second annular plate connected to the end of the second elastic element away from the second sleeve. The second annular plate is fixed on the second diagonal brace, and a second sliding block is fixed on the top of the second diagonal brace. The second sliding block is slidably connected in the groove.

[0017] Preferably, the main support beam is a channel steel box girder, the template is a high-strength bamboo plywood with a thickness of 1.2cm, and the sleepers are 10cm x 10cm square timber.

[0018] Preferably, the distance between two adjacent sleepers is set to 40cm, and the distance between two adjacent cross bracing channels is set to 120cm.

[0019] Preferably, the bracket has several equidistantly distributed first placement slots, the cross brace channel steel is placed in the first placement slots, the cross brace channel steel has equidistantly distributed second placement slots, and the sleeper is placed in the second placement slot.

[0020] This invention also discloses a method for using a bottom formwork support structure for cast-in-place bridge decks, comprising the following steps:

[0021] S1: Transport the main support beam in segments to the construction site assembly yard, and then assemble the main support beam at the construction site assembly yard;

[0022] S2: The main support beam is erected after it is assembled, and the bracket is placed in place along with the main support beam.

[0023] S3: Then, the workers rotated the lower screw, causing the upper screw to rotate synchronously with the lower screw. When the upper screw rotated, the screw tube moved upward relative to the upper screw, causing the screw tube to drive the bracket to move upward. The bracket moved upward to adapt to the pouring height of the bridge deck.

[0024] S4: When the lower screw rotates, the sleeve moves upward along the lower screw axis. The sleeve drives the support rod to move upward through the connecting frame. When the support rod moves upward, it applies a thrust to the first sleeve, which in turn applies a thrust to the first diagonal brace. The first diagonal brace rotates towards the main support beam as the bracket moves upward. The first slide at the end of the first diagonal brace slides in the groove. When the first diagonal brace can no longer rotate, the force on the first sleeve is transmitted to the first elastic element, which is compressed. As the bracket continues to move upward, when the first diagonal brace can continue to rotate, the first sleeve will continue to push the first diagonal brace to rotate until the bracket height is adjusted.

[0025] When the support rod moves upward, it applies a thrust to the second sleeve through the reinforcing rod, which in turn applies a thrust to the second diagonal brace. As the bracket moves upward, the second diagonal brace rotates away from the main support beam. The second slide at the end of the second diagonal brace slides in the groove. When the second diagonal brace can no longer rotate, the force on the second sleeve is transmitted to the second elastic element, causing the second elastic element to be compressed. As the bracket continues to move upward, when the second diagonal brace can continue to rotate, the second sleeve will continue to push the second diagonal brace to rotate until the bracket height is adjusted.

[0026] S5: Then, several cross bracing channel steels are placed at equal intervals in the first placement slot of the bracket, and several sleepers are placed at equal intervals in the second placement slot of the cross bracing channel steels. Finally, the bridge deck template is placed on the sleepers.

[0027] S6: After the formwork is installed, the bridge deck reinforcement is tied, and then the concrete bridge deck is poured inside the formwork.

[0028] S7: After the concrete is poured and solidified, adjust the height of the bracket to lower it and remove the formwork.

[0029] Compared with the prior art, the present invention provides a bottom formwork support structure and a method of using it for cast-in-place bridge decks, which has the following beneficial effects:

[0030] 1. The bottom formwork support structure and usage method of this cast-in-place bridge deck can automatically adjust the support angle of the diagonal bracing by adjusting the height of the bracket with a screw while driving the adjustment mechanism to move the adjustment component. The operation is simple and quick, effectively improving the bridge construction efficiency and shortening the bridge construction cycle. The triangular stable structure is formed by "screw drive → diagonal bracing angle self-adaptation + double rod reverse movement", which improves the stability of the bottom formwork support.

[0031] 2. The bottom formwork support structure and its usage method for the cast-in-place bridge deck are described. By setting up first and second diagonal braces to support multiple positions of the cross brace channel steel, the stress points of the cross brace channel steel are increased, the stress distribution of the cross brace channel steel is made uniform, and thus the stability of the bottom formwork support structure is improved.

[0032] 3. The bottom formwork support structure and its usage method for the cast-in-place bridge deck are as follows: the first diagonal brace moves closer to the main support beam as the bracket rises, while the second diagonal brace moves further away from the main support beam as the bracket rises. When the first and second diagonal braces cannot move, the first and second diagonal braces, together with the reinforcing rod, form a stable triangular support structure, further improving the stability of the bottom formwork support structure. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0034] Figure 2 For the present invention Figure 1 Enlarged structural diagram of section A in the middle;

[0035] Figure 3 For the present invention Figure 1 Enlarged structural diagram of section B in the middle;

[0036] Figure 4 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0037] Figure 5 For the present invention Figure 4 The main view;

[0038] Figure 6This is a schematic diagram of the structure of the bracket, cross bracing channel steel, and sleepers of the present invention when separated;

[0039] Figure 7 This is a schematic diagram of the height adjustment mechanism of the present invention;

[0040] Figure 8 This is a schematic diagram of the external structure of the first diagonal brace of the present invention;

[0041] Figure 9 This is a schematic diagram of the connection structure between the first and second diagonal braces of the present invention;

[0042] Figure 10 For the present invention Figure 9 Enlarged structural diagram of section C;

[0043] Figure 11 This is a partial structural schematic diagram of the cross bracing channel steel of the present invention.

[0044] In the diagram: 1. Main support beam; 2. Bracket; 201. First placement slot; 3. Cross brace channel steel; 301. Second placement slot; 302. Slide groove; 4. Sleeper; 5. Template; 6. First diagonal brace; 7. Support plate; 701. Upper screw; 702. Screw tube; 8. Lower screw; 801. Sleeve; 802. Connecting frame; 803. Support rod; 9. Adjustment part; 901. First sleeve; 902. First elastic element; 903. First annular plate; 10. First slide block; 11. Second diagonal brace; 12. Reinforcing rod; 121. Second sleeve; 122. Second elastic element; 123. Second annular plate; 13. Second slide block. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0046] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] like Figures 1 to 5As shown, this embodiment proposes a bottom formwork support structure for cast-in-place bridge decks, including two main support beams 1 arranged in parallel. The main support beams 1 are channel steel box girders, and also include: brackets 2, cross bracing channel steel 3, sleepers 4, and first diagonal bracing rods 6. The brackets 2 are slidably connected to the outside of the main support beams 1. The main support beams 1 are equipped with a height adjustment mechanism for adjusting the height of the brackets 2. The cross bracing channel steel 3 is set on the brackets 2 and placed perpendicular to the brackets 2. The distance between two adjacent cross bracing channel steels 3 is set to 120cm. The sleepers 4 are provided with... Multiple sleepers 4 are evenly distributed on the cross bracing channel steel 3. The distance between two adjacent sleepers 4 is set to 40cm. The sleepers 4 are made of 10cm x 10cm square timber. A template 5 is set on the sleepers 4. The template 5 is made of high-strength bamboo plywood with a thickness of 1.2cm. The lower side of the main support beam 1 is rotatably connected to the first diagonal brace 6 through the first pin. The end of the first diagonal brace 6 away from the main support beam 1 is connected to the lower side of the cross bracing channel steel 3. The height adjustment mechanism is equipped with an adjustment component for adjusting the tilt angle of the first diagonal brace 6.

[0048] When constructing the bridge deck bottom formwork support structure, the workers first adjust the height of the bracket 2 using the height adjustment mechanism to raise the bracket 2 to a height suitable for bridge deck pouring. Then, the cross bracing channel steel 3 is placed on the bracket 2, perpendicular to the bracket 2. Next, the sleepers 4 are placed on the cross bracing channel steel 3, perpendicular to the cross bracing channel steel 3. Finally, the bridge deck pouring template 5 is placed on the sleepers 4, thus completing the installation and erection of the bridge deck bottom formwork support structure. This application, by adjusting the height of the bracket 2 using the height adjustment mechanism, causes the adjustment component to move, thereby automatically adjusting the support angle of the first diagonal brace 6. The operation is simple and quick, effectively improving bridge construction efficiency and facilitating the shortening of the bridge construction cycle.

[0049] like Figure 1 , Figure 4 , Figure 5 and Figure 7 As shown, in a preferred embodiment, based on the above method, the height adjustment mechanism further includes a support plate 7 fixedly connected to the main support beam 1, an upper screw 701 rotatably connected to the support plate 7, and a screw tube 702 threadedly connected to the upper screw 701. The end of the screw tube 702 away from the support plate 7 is fixedly connected to the bracket 2.

[0050] When the height adjustment mechanism is working, the operator drives the upper screw 701 to rotate, causing the screw tube 702 to rotate relative to the upper screw 701. The screw tube 702 drives the bracket 2 to move upward, thereby adjusting the overall height of the bracket 2. It should be noted that the rotation drive method of the upper screw 701 can be manual, driven by a motor, or any other method that can drive the upper screw 701 to rotate, and there are no restrictions here.

[0051] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 9 , Figure 10 and Figure 11 As shown, in a preferred embodiment, based on the above method, the adjustment assembly further includes a lower screw 8 connected to the lower side of the upper screw 701, a sleeve 801 threadedly connected to the lower screw 8, a connecting frame 802 connected to the sleeve 801, a support rod 803 provided on the connecting frame 802, and an adjustment part 9 connected to the support rod 803 and provided on the first diagonal brace 6.

[0052] Furthermore, the adjustment unit 9 includes a first sleeve 901 rotatably connected to the support rod 803 and slidably connected to the outside of the first diagonal brace 6, a first elastic element 902 connected to the first sleeve 901, and a first annular plate 903 connected to the end of the first elastic element 902 away from the first sleeve 901. The first annular plate 903 is fixedly connected to the first diagonal brace 6. A first slide block 10 is fixedly provided on the top of the first diagonal brace 6. A groove 302 for sliding the first slide block 10 is provided on the cross brace channel steel 3. The groove 302 is a downward-opening "dovetail groove" to avoid mud intrusion and frequent cleaning.

[0053] When the upper screw 701 rotates, the lower screw 8 rotates simultaneously. It should be noted that the rotation of the lower screw 8 can be driven manually or by a drive motor. Alternatively, a dual-axis output motor can be installed within the support plate 7, with its two output shafts connected to the upper screw 701 and the lower screw 8 respectively. When the lower screw 8 rotates, the sleeve 801 moves upward along the axis of the lower screw 8. The sleeve 801 drives the support rod 803 upward through the connecting frame 802. As the support rod 803 moves upward, it applies a thrust to the first sleeve 901, causing the first sleeve 901 to apply a thrust to the first diagonal brace 6. The first diagonal brace 6 rotates towards the main support beam 1 as the bracket 2 moves upward. The first sliding block 10 at the end of the 6 slides in the groove 302. When the first diagonal brace 6 can no longer rotate, the force on the first sleeve 901 is transmitted to the first elastic element 902, causing the first elastic element 902 to be compressed. As the bracket 2 continues to move upward, when the first diagonal brace 6 can continue to rotate, the first sleeve 901 will continue to push the first diagonal brace 6 to rotate until the height of the bracket 2 is adjusted. This application can automatically adjust the support angle of the first diagonal brace 6 by using the height adjustment mechanism to adjust the height of the bracket 2 while driving the adjustment component. The operation is simple and quick, effectively improving the efficiency of bridge construction and facilitating the shortening of the bridge construction cycle.

[0054] like Figure 1 , Figure 4 and Figure 5As shown, in a preferred embodiment, based on the above method, a second diagonal brace 11 is further rotatably connected to the lower side of the main support beam 1 via a second pin, and the end of the second diagonal brace 11 away from the main support beam 1 is connected to the lower side of the cross brace channel steel 3.

[0055] By setting the second diagonal brace 11 in conjunction with the first diagonal brace 6 to support multiple positions of the cross brace channel steel 3, the stress points of the cross brace channel steel 3 are increased, the stress distribution of the cross brace channel steel 3 is made uniform, and thus the stability of the bottom formwork support structure is improved.

[0056] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 9 , Figure 10 and Figure 11 As shown, in a preferred embodiment, based on the above method, a reinforcing rod 12 is rotatably connected to the support rod 803 via a pin. The end of the reinforcing rod 12 away from the support rod 803 is connected to a second sleeve 121 that slides outside the second diagonal brace 11, a second elastic element 122 connected to the second sleeve 121, and a second annular plate 123 connected to the end of the second elastic element 122 away from the second sleeve 121. The second annular plate 123 is fixed on the second diagonal brace 11. A second slide block 13 is fixed on the top of the second diagonal brace 11. The second slide block 13 is slidably connected in the slide groove 302. The stiffness coefficients of the first elastic element 902 and the second elastic element 122 are in the range of 50~80N / mm to avoid elastic fatigue caused by dynamic load.

[0057] When the lower screw 8 rotates, the sleeve 801 moves upward along the axis of the lower screw 8. The sleeve 801 drives the support rod 803 to move upward through the connecting frame 802. When the support rod 803 moves upward, it applies a thrust to the second sleeve 121 through the reinforcing rod 12, causing the second sleeve 121 to apply a thrust to the second diagonal brace 11. The second diagonal brace 11 rotates away from the main support beam 1 as the bracket 2 moves upward. The second slide block 13 at the end of the second diagonal brace 11 slides in the slide groove 302. When the second diagonal brace 11 can no longer rotate, the force on the second sleeve 121 is transmitted to the second elastic element 12. 2. The second elastic element 122 is compressed. As the bracket 2 continues to move upward, when the second diagonal brace 11 can continue to rotate, the second sleeve 121 will continue to push the second diagonal brace 11 to rotate until the height of the bracket 2 is adjusted. The first diagonal brace 6 and the second diagonal brace 11, together with the reinforcing rod 12, form a stable triangular support structure, which further improves the stability of the bottom mold support structure. It should be noted that the first slide block 10 and the second slide block 13 are both equipped with rollers that contact the slide groove 302 in order to reduce the wear caused by planar sliding friction between the slide block and the slide groove 302.

[0058] like Figure 6 As shown, in a preferred embodiment, based on the above method, the bracket 2 is further provided with several equidistantly distributed first placement slots 201, the cross brace channel steel 3 is placed in the first placement slots 201, the cross brace channel steel 3 is provided with equidistantly distributed second placement slots 301, and the sleeper 4 is placed in the second placement slots 301; the cross brace channel steel 3 is placed in the first placement slots 201 to prevent the cross brace channel steel 3 from shaking randomly, and the sleeper 4 is placed in the second placement slots 301 to prevent the sleeper 4 from shaking randomly when supporting the bottom formwork of the bridge deck, thereby improving the stability of the bottom formwork support structure.

[0059] This invention also discloses a method for using a bottom formwork support structure for cast-in-place bridge decks, comprising the following steps:

[0060] S1: Transport the main support beam 1 in segments to the construction site assembly yard, and then assemble the main support beam 1 at the construction site assembly yard;

[0061] S2: After the main support beam 1 is assembled, it is erected, and the bracket 2 is erected and positioned along with the main support beam 1;

[0062] S3: Then, the staff rotated the lower screw 8, so that the upper screw 701 rotated synchronously with the lower screw 8. When the upper screw 701 rotated, the screw tube 702 moved upward relative to the upper screw 701, so that the screw tube 702 drove the bracket 2 to move upward. The bracket 2 moved upward to adapt to the pouring height of the bridge deck.

[0063] S4: When the lower screw 8 rotates, the sleeve 801 moves upward along the axis of the lower screw 8. The sleeve 801 drives the support rod 803 to move upward through the connecting frame 802. When the support rod 803 moves upward, it applies a thrust to the first sleeve 901, so that the first sleeve 901 applies a thrust to the first diagonal brace 6. The first diagonal brace 6 rotates towards the main support beam 1 as the bracket 2 moves upward. The first slide block 10 at the end of the first diagonal brace 6 slides in the slide groove 302. When the first diagonal brace 6 can no longer rotate, the force on the first sleeve 901 will be transmitted to the first elastic element 902, so that the first elastic element 902 is compressed. As the bracket 2 continues to move upward, when the first diagonal brace 6 can continue to rotate, the first sleeve 901 will continue to push the first diagonal brace 6 to rotate until the height of the bracket 2 is adjusted.

[0064] When the support rod 803 moves upward, it applies a thrust to the second sleeve 121 through the reinforcing rod 12, which in turn applies a thrust to the second diagonal brace 11. The second diagonal brace 11 rotates away from the main support beam 1 as the bracket 2 moves upward. The second slide block 13 at the end of the second diagonal brace 11 slides in the slide groove 302. When the second diagonal brace 11 can no longer rotate, the force on the second sleeve 121 is transmitted to the second elastic element 122, which is compressed. As the bracket 2 continues to move upward, when the second diagonal brace 11 can continue to rotate, the second sleeve 121 will continue to push the second diagonal brace 11 to rotate until the height of the bracket 2 is adjusted.

[0065] S5: Then, several cross bracing channel steels 3 are equidistantly arranged in the first placement slot 201 of the bracket 2, and several sleepers 4 are equidistantly arranged in the second placement slot 301 of the cross bracing channel steels 3. Finally, the bridge deck template 5 is placed on the sleepers 4.

[0066] S6: After the template 5 is installed, the bridge deck reinforcement is tied, and then the concrete bridge deck is poured inside the template 5.

[0067] S7: After the concrete is poured and solidified, adjust the height of bracket 2 to lower it and remove the formwork 5.

[0068] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cast-in-place bridge deck slab formwork support structure comprising two main support beams (1) arranged side by side, characterized in that, Also include: The bracket (2) is slidingly connected on the outer side of the main support beam (1), and the main support beam (1) is provided with a height adjusting mechanism for adjusting the height of the bracket (2); The cross brace channel steel (3) is arranged on the bracket (2) and is perpendicular to the bracket (2); The sleeper (4) is provided with a plurality of sleepers (4) and is equally distributed on the cross brace channel steel (3), and the sleeper (4) is provided with a formwork (5); And the first inclined strut (6), the lower side of the main support beam (1) is rotatably connected with the first inclined strut (6) through the first pin shaft, and the end of the first inclined strut (6) away from the main support beam (1) is connected with the lower side of the cross brace channel steel (3); Wherein, the height adjusting mechanism is provided with an adjusting assembly for adjusting the inclination angle of the first inclined strut (6); the height adjusting mechanism comprises a support plate (7) fixedly connected with the main support beam (1), an upper screw rod (701) rotatably connected with the support plate (7), and a screw pipe (702) threadedly connected with the upper screw rod (701), one end of the screw pipe (702) away from the support plate (7) is fixedly connected with the bracket (2); The adjusting assembly comprises a lower screw rod (8) connected with the lower side of the upper screw rod (701), a sleeve (801) threadedly connected with the lower screw rod (8), a connecting frame (802) connected with the sleeve (801), a support rod (803) arranged on the connecting frame (802), and an adjusting part (9) connected with the support rod (803) and arranged on the first inclined strut (6); The adjusting part (9) comprises a first sleeve (901) rotatably connected with the support rod (803) and slidingly connected on the outer side of the first inclined strut (6), a first elastic element (902) connected with the first sleeve (901), and a first annular plate (903) connected with the end of the first elastic element (902) away from the first sleeve (901), the first annular plate (903) is fixedly connected with the first inclined strut (6), the top of the first inclined strut (6) is provided with a first sliding seat (10), and the cross brace channel steel (3) is provided with a sliding groove (302) for sliding of the first sliding seat (10).

2. A formwork panel falsework support structure according to claim 1, wherein, The lower side of the main support beam (1) is also rotatably connected with the second inclined strut (11) through the second pin shaft, and the end of the second inclined strut (11) away from the main support beam (1) is connected with the lower side of the cross brace channel steel (3).

3. A formwork panel falsework support structure according to claim 2, wherein, The support rod (803) is rotatably connected with a reinforcing rod (12) through a pin shaft, the end of the reinforcing rod (12) away from the support rod (803) is connected with a second sleeve (121) sliding on the outer side of the second inclined strut (11), a second elastic element (122) connected with the second sleeve (121), and a second annular plate (123) connected with the end of the second elastic element (122) away from the second sleeve (121), the second annular plate (123) is fixedly arranged on the second inclined strut (11), and the top of the second inclined strut (11) is provided with a second sliding seat (13), and the second sliding seat (13) is slidingly connected in the sliding groove (302).

4. A formwork panel falsework support structure according to claim 3, wherein, The main support beam (1) adopts a channel steel box beam, the formwork (5) adopts a high-strength bamboo plywood with a thickness of 1.2 cm, and the sleeper (4) adopts a square wood with a size of 10 cm x 10 cm.

5. A formwork panel falsework support structure according to claim 4, wherein, The distance between two adjacent sleepers (4) is 40 cm, and the distance between two adjacent cross support channel steels (3) is 120 cm.

6. A formwork panel falsework support structure according to claim 5, wherein, The bracket (2) is provided with a plurality of first placing grooves (201) distributed at equal intervals, the cross support channel steel (3) is placed in the first placing groove (201), the cross support channel steel (3) is provided with a plurality of second placing grooves (301) distributed at equal intervals, and the sleeper (4) is placed in the second placing groove (301).

7. A method of using a cast-in-place bridge deck formwork support structure according to claim 6, characterised in that, The method comprises the following steps: S1: The main support beam (1) is transported to the site assembly field in sections, and then the main support beam (1) is assembled at the site assembly field; S2: After the main support beam (1) is assembled, it is erected, and the bracket (2) is erected in place with the main support beam (1); S3: Then the worker rotates the lower screw rod (8), so that the upper screw rod (701) rotates synchronously with the lower screw rod (8), the screw pipe (702) moves upward relative to the upper screw rod (701) when the upper screw rod (701) rotates, the screw pipe (702) drives the bracket (2) to move upward, and the bracket (2) moves upward to adapt to the pouring height of the bridge deck slab; S4: When the lower screw rod (8) rotates, the sleeve (801) moves axially upward along the lower screw rod (8), the sleeve (801) drives the support rod (803) to move upward through the connecting frame (802), the support rod (803) exerts a pushing force on the first sleeve (901) when moving upward, the first sleeve (901) exerts a pushing force on the first inclined support rod (6), the first inclined support rod (6) rotates towards the main support beam (1) as the bracket (2) moves upward, the first sliding seat (10) at the end of the first inclined support rod (6) slides in the sliding groove (302), and when the first inclined support rod (6) cannot continue to rotate, the force received by the first sleeve (901) is transmitted to the first elastic element (902), so that the first elastic element (902) is compressed, and as the bracket (2) continues to move upward, the first sleeve (901) continues to push the first inclined support rod (6) to rotate when the first inclined support rod (6) can continue to rotate, until the height adjustment of the bracket (2) is completed. When the support rod (803) moves upward, the second sleeve (121) is pushed by the reinforcing rod (12), and the second sleeve (121) pushes the second inclined support rod (11), the second inclined support rod (11) rotates away from the main support beam (1) with the upward movement of the bracket (2), the second sliding seat (13) at the end of the second inclined support rod (11) slides in the sliding groove (302), and when the second inclined support rod (11) cannot continue to rotate, the force on the second sleeve (121) is transmitted to the second elastic element (122), so that the second elastic element (122) is compressed, and as the bracket (2) continues to move upward, the second sleeve (121) continues to push the second inclined support rod (11) to rotate until the height adjustment of the bracket (2) is completed; S5: Then several cross bracing channel steels (3) are arranged equidistantly in the first placing groove (201) of the bracket (2), then several sleepers (4) are arranged equidistantly in the second placing groove (301) of the cross bracing channel steel (3), and finally the bridge deck slab template (5) is placed on the sleepers (4); S6: After the template (5) is installed, the bridge deck slab steel is bound, and then the concrete bridge deck slab is poured in the template (5); S7: After the concrete pouring is completed and solidified, the height of the bracket (2) is adjusted, the bracket (2) is lowered, and the template (5) is removed.

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