A suspended cast box girder inner mold support device

Abstract

The present application belongs to the technical field of box girder construction, in particular to a suspended pouring box girder inner mold support device, which comprises a bridge deck body; a plurality of suspended pouring box girder hanging baskets are fixedly connected to the top of the bridge deck body; a plurality of fine rolled threaded steel connecting vertical hangers are threadedly connected to the top of the suspended pouring box girder hanging baskets; and a plurality of bridge deck pads are fixedly connected to the top of the bridge deck body. The inner mold support system is fully combined with the suspended pouring box girder hanging basket, is suitable for various types of hanging baskets, does not change the stress point position of the hanging basket system, and the stress point of the support system is still at the front upper beam hanger position of the hanging basket. In addition, no additional load is generated on the hanging basket system, no additional beam structure is added on the hanging basket, the system avoids the troublesome operation of opening holes in the inner chamber diaphragm of the suspended pouring box girder to pass through the inner sliding beam, the overall structure system is simple and easy to understand, safe and reliable, easy to operate, and convenient for construction.

Description

Technical Field

[0001] This invention belongs to the field of box girder construction technology, specifically a support device for the inner formwork of a cantilever box girder. Background Technology

[0002] When constructing bridges with large spans, the cantilever casting method using hanging baskets is required. It has the advantages of low investment, fast continuous construction speed, and easy control of bridge alignment.

[0003] In current technology, during construction, the diamond-shaped hanging basket is assembled, and then the hanging rods are fixed to the hanging basket. The hanging rods are used to fix the mold and other devices in the position where pouring is required. Then the size of the inner cavity opening is adjusted. After all the templates are fixed, concrete is poured.

[0004] When the size of the opening in the diaphragm cavity of the cantilever box girder is reduced due to adjustment or the diaphragm is completely closed, the inner box truss cannot be lifted by using the hanging basket beam and the pre-embedded fine-rolled threaded steel rods in the already poured section to lift the inner sliding beam. Therefore, a cantilever box girder inner formwork support device is proposed to address the above problems. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, the present invention proposes an inner formwork support device for cantilever box girder.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A cantilever box girder inner formwork support device of this invention includes a bridge deck body; multiple sets of cantilever box girder hanging baskets are fixedly connected to the top of the bridge deck body; multiple sets of fine-rolled threaded steel connecting vertical hangers are threadedly connected to the top of the cantilever box girder hanging baskets; multiple sets of bridge deck pads are fixedly connected to the top of the bridge deck pads; bridge deck support beams are bolted to the top of the bridge deck pads; the bridge deck pads and bridge deck support beams are symmetrically arranged; multiple transverse diaphragm outer inner box chamber support beams are bolted to the outer wall of the fine-rolled threaded steel connecting vertical hangers; inner box chamber trusses are fixedly connected to the top of the multiple transverse diaphragm outer inner box chamber support beams; multiple inner box chamber sliding beams are bolted to the outer wall of the fine-rolled threaded steel connecting vertical hangers.

[0007] Preferably, a fixing block is fixedly connected to the top of the inner sliding beam of the inner box; a stop block is fixedly connected to the top of the inner box support beam outside the transverse partition; a first groove and a second groove are formed on the side wall of the stop block; a first spring is fixedly connected to the inner side wall of the first groove; a pressing rod is fixedly connected to the end of the first spring; the pressing rod is slidably connected to the first groove; an air inlet is formed on the side wall of the fixing block; an exhaust hole is formed on the inner side wall of the first groove; the second groove is connected to the first groove through the exhaust hole; and a top column is slidably connected to the inner side wall of the second groove.

[0008] Preferably, the three precision-rolled threaded steel connecting vertical rods are provided with connecting blocks on their outer sidewalls; the connecting blocks are provided with a pair of sliding grooves on their sidewalls; the sliding grooves are provided with multiple sets of fixing buckles on their inner sidewalls; the sliding grooves are symmetrically arranged.

[0009] Preferably, the side wall of the fixing buckle has a third groove; a second spring is fixedly connected to the inner side wall of the third groove; an adjusting knob is fixedly connected to the end of the second spring; the adjusting knob is slidably connected to the inner side wall of the third groove; and multiple sets of adjusting holes are provided on the side wall of the connecting block.

[0010] Preferably, a fixing plate is fixedly connected to the side wall of the inner box sliding beam; a connecting rod is rotatably connected to the side wall of the fixing plate; and a fixing plate is rotatably connected to the output end of the connecting rod.

[0011] Preferably, a first graphite plate is fixedly connected to the inner wall of the sliding groove; a second graphite plate is fixedly connected to the inner wall of the sliding groove; the first graphite plate and the second graphite plate are slidably connected to the fixing buckle.

[0012] Preferably, the side wall of the fixing block is provided with a dustproof net; the dustproof net is fixed to the side wall of the fixing block; the dustproof net is located at the end of the air inlet.

[0013] Preferably, a rubber pad is provided at the top of the extrusion rod; the rubber pad is fixed to the top of the extrusion rod.

[0014] The beneficial effects of this invention are:

[0015] This invention provides an internal formwork support device for cantilever box girders. This internal formwork support system is fully integrated with the cantilever box girder hanging basket system, and is suitable for various types of hanging baskets. It does not change the position of the stress point of the hanging basket system. The stress point of the support system on the hanging basket is still at the position of the upper front crossbeam hanger, and it does not generate additional loads on the hanging basket system. It does not add additional crossbeams or other structures to the hanging basket. This system avoids the troublesome operation of opening holes in the transverse diaphragm of the cantilever box girder to pass through the inner sliding beam. The overall structure is simple and easy to understand, safe and reliable, easy to operate, and convenient for construction.

[0016] This invention provides an inner formwork support device for cantilever box girders. By setting fixed blocks, it effectively facilitates the movement of the inner box truss by workers, effectively reduces the workload of workers, and increases the safety of workers when moving the inner box truss. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a diagram showing the fit between the fixing block and the sliding beam inside the inner box in this invention;

[0020] Figure 3 This is a perspective view of the connecting rod in this invention;

[0021] Figure 4 This is a cross-sectional view of the fixing block and the connecting block in this invention;

[0022] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0023] Figure 6 This is a perspective view of the first graphite plate and the second graphite plate in this invention;

[0024] Figure 7 This is a three-dimensional view of the magnet in this invention;

[0025] Legend:

[0026] 1. Bridge deck body; 11. Cantilever box girder hanging basket; 12. Precision rolled threaded steel connecting vertical hangers; 13. Bridge deck support beam; 14. Transverse diaphragm outer and inner box girder support beam; 15. Inner box girder truss; 16. Bridge deck pad block; 17. Inner box girder sliding beam; 2. Stop block; 21. Fixing block; 22. First groove; 23. First spring; 24. Extrusion rod; 25. Top column; 26. Air inlet; 27. Exhaust outlet; 28. Second groove; 3. Connecting block; 31. Sliding groove; 32. Fixing buckle; 4. Third groove; 41. Second spring; 42. Adjusting knob; 43. Adjusting hole; 5. Connecting rod; 51. Fixing plate; 6. First graphite plate; 61. Second graphite plate; 7. Dustproof net; 8. Rubber pad; 9. Magnetic sheet. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Specific implementation examples are given below.

[0029] Please see Figure 1 - Figure 6This invention provides an inner formwork support device for a cantilever box girder, comprising a bridge deck body 1; multiple sets of cantilever box girder hanging baskets 11 are fixedly connected to the top of the bridge deck body 1; multiple sets of fine-rolled threaded steel connecting vertical hangers 12 are threadedly connected to the top of the cantilever box girder hanging baskets 11; multiple sets of bridge deck pads 16 are fixedly connected to the top of the bridge deck pads 16; bridge deck support beams 13 are bolted to the top of the bridge deck pads 16; the bridge deck pads 16 and the bridge deck support beams 13 are symmetrically arranged; multiple transverse diaphragm inner and outer box girders are bolted to the outer wall of the fine-rolled threaded steel connecting vertical hangers 12. The inner box girder 14 is supported by a diaphragm support beam 14; an inner box girder truss 15 is fixedly connected to the top of the multiple outer inner box girder support beams 14; multiple inner box girder sliding beams 17 are bolted to the outer wall of the vertical hanger 12 connected by the threaded steel. During operation, the bridge deck body 1 is first assembled, the inner box girder sliding beam 17 is placed at the front end of the already poured section beam, and the outer inner box girder support beams 14 are installed along the bridge direction. One end of the outer inner box girder support beam 14 is on the inner box girder sliding beam 17, and the other end is connected to the vertical girder by the threaded steel suspended from the upper crossbeam at the front of the cantilever box girder hanging basket 11. The suspender 12 lifts the inner box girder 17. The length of the inner box girder 17 is selected according to the box girder dimensions. One end is lifted by a threaded steel bar hanging from a pre-reserved hole in the cast-in-place beam segment, connected to the vertical suspender 12. The other end is lifted by a threaded steel bar on top of the bridge deck 1, connected to the vertical suspender 12. The inner box girder truss 15 is installed on the outer inner box girder support beam 14 and the inner box girder 17 of the transverse diaphragm. The appropriately sized outer inner box girder support beam 14 and the inner box girder 17 are connected to the vertical suspender via the bridge deck support beam 13 on top of the bridge deck 1 and threaded steel bars. 12 is lifted, thus forming the internal formwork support system of the cantilever box girder. This internal formwork support system is fully integrated with the cantilever box girder hanging basket 11 system, which is suitable for various types of hanging baskets. It does not change the position of the stress point of the hanging basket system. The stress point of the support system on the hanging basket is still at the position of the upper front crossbeam hanger, and it does not generate additional load on the hanging basket system. No additional crossbeams or other structures are added to the hanging basket. This system avoids the troublesome operation of opening holes in the transverse diaphragm of the cantilever box girder to pass through the inner sliding beam. The overall structure system is simple and easy to understand, safe and reliable, easy to operate, and convenient for construction.

[0030] Furthermore, such as Figure 1 - Figure 4As shown, a fixing block 21 is fixedly connected to the top of the inner chamber sliding beam 17; a stop block 2 is fixedly connected to the top of the inner chamber support beam 14 outside the transverse partition; a first groove 22 and a second groove 28 are formed on the side wall of the stop block 2; a first spring 23 is fixedly connected to the inner side wall of the first groove 22; a pressing rod 24 is fixedly connected to the end of the first spring 23; the pressing rod 24 is slidably connected to the first groove 22; an air inlet 26 is formed on the side wall of the fixing block 21; an exhaust hole 27 is formed on the inner side wall of the first groove 22; the second groove 28 is connected to the first groove 22 through the exhaust hole 27; a top column 25 is slidably connected to the inner side wall of the second groove 28. During operation... When the workers place the inner chamber truss 15 on top of the inner chamber support beam 14 outside the diaphragm and the inner chamber sliding beam 17 inside the inner chamber, it is necessary to fix the inner chamber truss 15 to the fixed position on top of the inner chamber sliding beam 17 and the inner chamber support beam 14 outside the diaphragm according to the construction requirements. This ensures the overall strength during subsequent concrete pouring. During installation, the workers mark the fixing point at one end of the inner chamber truss 15, then fix the stop block 2 at the marked point. Then, the inner chamber truss 15 is installed on top of the inner chamber sliding beam 17 and the inner chamber support beam 14 outside the diaphragm. The inner chamber truss 15 is then placed on top of the inner chamber support beam 14 outside the diaphragm and the inner chamber sliding beam. When the top is reached (17), the position of the inner chamber truss 15 needs to be adjusted so that it can be fixed in the predetermined position. The stop block 2 is located on the inner side wall of the inner chamber truss 15. The inner chamber truss 15 needs to be moved until it fits against the stop block 2. A one-way valve is installed in the air inlet 26, allowing air to enter the first groove 22 only through the air inlet 26, but preventing it from escaping. A fixed one-way valve is also installed in the exhaust port 27, allowing air in the first groove 22 to be exhausted into the second groove 28 through the exhaust port 27, while air in the second groove 28 cannot enter the first groove 22. The inner chamber truss 15 is made of metal. Due to its weight and size, the inner chamber truss 15 is difficult for workers to move when placed on top of the inner chamber support beam 14 outside the diaphragm and the inner chamber sliding beam 17. At this time, the workers press the squeezing rod 24, which compresses the air in the first groove 22 into the second groove 28, thereby squeezing the top column 25 out of the second groove 28. This pushes the inner chamber truss 15 until the inner side wall of the inner chamber truss 15 is in contact with the side wall of the stop block 2. The fixed block 21 effectively facilitates the movement of the inner chamber truss 15 by the workers, effectively reducing the workload of the workers and increasing the safety of the workers when moving the inner chamber truss 15.

[0031] Furthermore, such as Figure 4 - Figure 6As shown, the three fine-rolled threaded steel connecting vertical hangers 12 are provided with connecting blocks 3 on their outer walls; a pair of sliding grooves 31 are provided on the side walls of the connecting blocks 3; multiple sets of fixing buckles 32 are provided on the inner side walls of the sliding grooves 31; the sliding grooves 31 are symmetrically arranged. During operation, when installing the inner box truss 15, the fine-rolled threaded steel connecting vertical hangers 12 will shake, leading to overall instability and making it difficult for workers to install and fix the equipment. By using the sliding grooves 31, and with the connecting blocks 3 divided into two parts connected by hinges and fixed with bolts, the fine-rolled threaded steel connecting vertical hangers 12 can be fixed between a pair of sliding grooves 31. Then, the sliding grooves 31 are fixed with bolts, thereby fixing the three fine-rolled threaded steel connecting vertical hangers 12 in the middle of the connecting blocks 3. This effectively reduces the shaking of the fine-rolled threaded steel connecting vertical hangers 12, thereby increasing the stability of the equipment, facilitating the installation and fixing of the equipment, and increasing the safety of workers during operation.

[0032] Furthermore, such as Figure 1 - Figure 6 As shown, the fixing buckle 32 has a third groove 4 on its side wall; a second spring 41 is fixedly connected to the inner side wall of the third groove 4; an adjusting knob 42 is fixedly connected to the end of the second spring 41; the adjusting knob 42 is slidably connected to the inner side wall of the third groove 4; the connecting block 3 has multiple sets of adjusting holes 43 on its side wall. During operation, when installing the threaded steel connecting vertical hanger 12, the threaded steel connecting vertical hanger 12 changes according to the construction situation, making it impossible for the connecting block 3 to fix the threaded steel connecting vertical hanger 12. By providing the adjusting holes 43, the workers can adjust the threaded steel connecting vertical hanger 12. Pressing the adjusting knob 42 into the third groove 4 moves the position of the fixing buckle 32. After moving to the appropriate position, the second spring 41 will push the adjusting knob 42 into the adjusting hole 43, thereby fixing the fixing buckle 32. The adjusting knob 42 is made of magnet. This step allows the operator to adjust the position of the fixing buckle 32 according to the spacing between the vertical hangers 12 of the threaded steel connection, thereby fixing the vertical hangers 12 of the threaded steel connection, effectively increasing the scope of use of the equipment, improving the applicability of the equipment, and increasing the stability of the equipment.

[0033] Furthermore, such as Figure 1 - Figure 4As shown, a pair of fixing plates 51 are fixed to the side wall of the inner box slide beam 17; a connecting rod 5 is rotatably connected to the side wall of the fixing plate 51; the output end of the connecting rod 5 is rotatably connected to the fixing plate 51. During operation, by setting the fixing plate 51 and the connecting rod 5, the fixing plate 51 is fixed between the pair of fixing plates 51 on the side wall of the inner box slide beam 17, and the connecting rod 5 is rotatably connected. The connecting rod 5 is divided into two parts: one part is a shell, and the other part is a screw. The two are connected by threads. According to the distance between the inner box slide beams 17, the length of the connecting rod 5 can be adjusted by turning the fixing plate 51, thereby increasing the fixing effect between the inner box slide beams 17 and increasing the stability of the inner box slide beams 17.

[0034] Furthermore, such as Figure 4 - Figure 6 As shown, a first graphite plate 6 is fixedly connected to the inner wall of the sliding groove 31; a second graphite plate 61 is fixedly connected to the inner wall of the sliding groove 31; the first graphite plate 6 and the second graphite plate 61 are slidably connected to the fixing buckle 32. During operation, the first graphite plate 6 effectively reduces the friction between the fixing buckle 32 and the first graphite plate 6 and the second graphite plate 61, thereby improving the smoothness of the sliding of the fixing buckle 32, reducing the wear of the fixing buckle 32, and increasing the service life of the equipment.

[0035] Furthermore, such as Figure 1 - Figure 4 As shown, the side wall of the fixed block 21 is provided with a dustproof net 7; the dustproof net 7 is fixed to the side wall of the fixed block 21; the dustproof net 7 is located at the end of the air inlet 26. During operation, the dustproof net 7 effectively reduces the situation where dust and impurities enter the first groove 22 from the air inlet 26 when the extrusion rod 24 is used, thereby preventing the air inlet 26 from being blocked.

[0036] Furthermore, such as Figure 1 - Figure 4 As shown, a rubber pad 8 is provided on the top of the extrusion rod 24; the rubber pad 8 is fixed to the top of the extrusion rod 24. During operation, the rubber pad 8 effectively increases the friction when using the extrusion rod 24, thereby reducing the possibility of the extrusion rod 24 slipping and increasing its stability.

[0037] Furthermore, such as Figure 7 As shown, a magnet 9 is provided on the inner wall of the second spring 41. The magnet 9 is fixed to the inner wall of the second spring 41. During operation, the magnet 9 is provided, and there is a repulsive force between the magnet 9 and the adjusting knob 42. When the second spring 41 enters the third groove 4, the adjusting knob 42 will be squeezed out of the third groove 4 under the action of the repulsive force, thereby completing the fixing of the fixing buckle 32.

[0038] Working principle: During operation, the bridge deck body 1 is first assembled. An inner box girder 17 is placed at the front end of the already cast segment, and the outer inner box girder support beam 14 is installed along the bridge direction. One end of the outer inner box girder support beam 14 rests on the inner box girder 17, and the other end is lifted by a threaded steel bar connected to a vertical hanger 12 suspended from the upper crossbeam at the front of the cantilever box girder hanging basket 11. The inner box girder 17 is selected according to the box girder size, with one end lifted by a threaded steel bar connected to a vertical hanger 12 hanging from a pre-reserved duct in the already cast segment, and the other end lifted by a threaded steel bar connected to a vertical hanger 12 at the top of the bridge deck body 1. The inner box girder truss 15 is installed on the outer inner box girder support beam 14 and the inner box girder 17. The appropriately sized outer inner box girder... The inner box girder support beam 14 and the inner box girder sliding beam 17 are lifted by the bridge deck support beam 13 and the vertical hanger 12 connected by the precision-rolled threaded steel on the top of the bridge deck body 1, thus forming the inner formwork support system of the cantilever box girder. This inner formwork support system is fully integrated with the cantilever box girder hanging basket 11 system, which is suitable for various types of hanging baskets. It does not change the position of the hanging basket system's stress point. The stress point of the support system on the hanging basket is still at the position of the upper horizontal beam hanger, and it does not generate additional loads on the hanging basket system. No additional horizontal beams or other structures are added to the hanging basket. This system avoids the troublesome operation of opening holes in the transverse diaphragm of the inner box girder to pass through the inner sliding beam. The overall structure is simple and easy to understand, safe and reliable, easy to operate, and convenient for construction. After the workers place the inner box girder truss 15 outside the transverse diaphragm, the inner box girder support beam 14 and the inner box girder sliding beam 17 are lifted by the bridge deck support beam 13 on the top of the bridge deck body 1, the inner box girder sliding beam 17 and the inner box girder sliding beam 17 are lifted by the bridge deck support beam 13 and the precision-rolled threaded steel on the top of the bridge deck body 1, the inner box girder sliding beam 17 is lifted by the bridge deck support beam 13 and the vertical hanger 12 connected by ... bridge deck support beam 13 and the vertical hanger 12 connected by the bridge deck support beam 13 and the vertical hanger 12 connected by the bridge deck support beam 13 and the vertical hanger 12 connected by the bridge deck support When installing the inner box girder 17, the inner box girder truss 15 needs to be fixed to the top of the inner box girder 17 and the inner box girder support beam 14 outside the diaphragm according to construction requirements. This ensures the overall strength during subsequent concrete pouring. During installation, workers mark the fixing point at one end of the inner box girder truss 15, then fix the stop block 2 at the marked point. The inner box girder truss 15 is then installed on top of the inner box girder 17 and the inner box girder support beam 14 outside the diaphragm. When placing the inner box girder truss 15 on top of the inner box girder support beam 14 outside the diaphragm and the inner box girder 17, the position of the inner box girder truss 15 needs to be adjusted so that it can be fixed in the predetermined position, and the stop block 2 is located on the inner wall of the inner box girder truss 15. The inner chamber truss 15 needs to be moved to fit against the stop block 2. A one-way valve is installed in the air inlet 26, allowing air to enter the first groove 22 but preventing it from escaping. A fixed one-way valve is also installed in the exhaust port 27, allowing air in the first groove 22 to be exhausted into the second groove 28, while air in the second groove 28 cannot enter the first groove 22. Since the inner chamber truss 15 is made of metal and is quite heavy, it is difficult for workers to move it when it is placed on top of the inner chamber support beam 14 outside the transverse partition and the inner chamber sliding beam 17. At this point, workers press the compression rod 24, forcing the air in the first groove 22 into the second groove 28.Then, by pressing the top column 25 into the second groove 28, the top column 25 pushes the inner chamber truss 15 to move until the inner side wall of the inner chamber truss 15 is in contact with the side wall of the stop block 2. The fixed block 21 effectively facilitates the movement of the inner chamber truss 15 by the staff, effectively reducing the workload of the staff and increasing the safety of the staff when moving the inner chamber truss 15. When installing the inner chamber truss 15, the threaded steel connecting the vertical hanger 12 will shake, which will lead to overall instability and make it difficult for the staff to install and fix the equipment. Through the sliding groove 31, and the connecting block 3 is divided into two parts, connected by a hinge and fixed with bolts, and the sliding groove 31 on both sides of the connecting block 3, the threaded steel connecting the vertical hanger 12 can be moved. The vertical hanger 12 is fixed between a pair of sliding grooves 31, and then the sliding grooves 31 are fixed by bolts. This fixes the three threaded steel connecting vertical hangers 12 in the middle of the connecting block 3, effectively reducing the shaking of the threaded steel connecting vertical hangers 12, thus increasing the stability of the equipment, facilitating the installation and fixing of the equipment, and increasing the safety of the workers. When installing the threaded steel connecting vertical hangers 12, the position of the threaded steel connecting vertical hangers 12 needs to be adjusted according to the construction situation. If the connecting block 3 cannot fix the threaded steel connecting vertical hangers 12, an adjustment hole 43 is provided. Workers can press the adjustment knob 42 into the third groove 4 to move the position of the fixing buckle 32. Once in the appropriate position, the second spring 41 will push the adjusting knob 42 into the adjusting hole 43, thereby fixing the fixing buckle 32. The adjusting knob 42 is made of magnet. This step allows the operator to adjust the position of the fixing buckle 32 according to the spacing between the vertical hangers 12 of the threaded steel connection, thus fixing the vertical hangers 12 of the threaded steel connection, effectively increasing the scope of use of the equipment, improving its applicability, and increasing its stability. By setting the fixing plate 51 and the connecting rod 5, the fixing plate 51 is fixed to the side wall of a pair of inner box slide beams 17. The connecting rod 5 is rotatably connected between the pair of fixing plates 51. The connecting rod 5 is divided into two parts: one part is the housing, and the other part is the screw. The two are connected by threads. The length of the connecting rod 5 can be adjusted by turning the fixing plate 51 according to the distance between the inner sliding beams 17, thereby increasing the fixing effect between the inner sliding beams 17 and increasing the stability of the inner sliding beams 17. The first graphite plate 6 effectively reduces the friction between the fixing buckle 32 and the first graphite plate 6 and the second graphite plate 61, thereby improving the smoothness of the sliding of the fixing buckle 32 and reducing the wear of the fixing buckle 32, increasing the service life of the equipment. The dustproof net 7 effectively reduces the entry of dust and impurities into the first groove 22 from the air inlet 26 when using the extrusion rod 24, thus reducing the possibility of the air inlet 26 being blocked. The rubber pad 8 effectively increases the friction when using the extrusion rod 24.This reduces the likelihood of slippage when using the squeezing rod 24, increasing its stability. Through the placement of the magnetic piece 9, and the repulsive force between the magnetic piece 9 and the adjusting knob 42, when the second spring 41 enters the third groove 4, the adjusting knob 42 is squeezed out of the third groove 4 under the action of the repulsive force, thus completing the fixation of the retaining clip 32.

Claims

1. A support device for the inner formwork of a cantilever box girder, comprising a bridge deck body (1); characterized in that: The top of the bridge deck body (1) is fixed with multiple sets of cantilever box girder hanging baskets (11); the top of the cantilever box girder hanging baskets (11) is threaded with multiple sets of fine-rolled threaded steel connecting vertical hangers (12); the top of the bridge deck body (1) is fixed with multiple sets of bridge deck pads (16); the top of the bridge deck pads (16) is bolted with bridge deck support beams (13); the bridge deck pads (16) and bridge deck support beams (13) are symmetrically arranged; the outer wall of the fine-rolled threaded steel connecting vertical hangers (12) is bolted with multiple transverse diaphragm outer inner box chamber support beams (14); the top of the multiple transverse diaphragm outer inner box chamber support beams (14) is fixed with inner box chamber trusses (15); the outer wall of the fine-rolled threaded steel connecting vertical hangers (12) is bolted with multiple inner box chamber sliding beams (17); A fixing block (21) is fixedly connected to the top of the inner box slide beam (17); a stop block (2) is fixedly connected to the top of the inner box support beam (14) outside the transverse partition; a first groove (22) and a second groove (28) are provided on the side wall of the stop block (2); a first spring (23) is fixedly connected to the inner side wall of the first groove (22); a pressing rod (24) is fixedly connected to the end of the first spring (23); the pressing rod (24) is slidably connected to the first groove (22); an air inlet (26) is provided on the side wall of the fixing block (21); and a one-way valve is installed in the air inlet (26); an exhaust hole (27) is provided on the inner side wall of the first groove (22); the second groove (28) is connected to the first groove (22) through the exhaust hole (27); a top column (25) is slidably connected to the inner side wall of the second groove (28). The three fine-rolled threaded steel connecting vertical hangers (12) are provided with connecting blocks (3) on their outer side walls; a pair of sliding grooves (31) are provided on the side walls of the connecting blocks (3); multiple sets of fixing buckles (32) are provided on the inner side walls of the sliding grooves (31); the sliding grooves (31) are symmetrically arranged; The fixing buckle (32) has a third groove (4) on its side wall; a second spring (41) is fixedly connected to the inner side wall of the third groove (4); an adjusting knob (42) is fixedly connected to the end of the second spring (41); the adjusting knob (42) is slidably connected to the inner side wall of the third groove (4); and multiple sets of adjusting holes (43) are opened on the side wall of the connecting block (3).

2. The cantilever box girder inner formwork support device according to claim 1, characterized in that: A pair of fixing plates (51) are fixed to the side wall of the inner box sliding beam (17); a connecting rod (5) is rotatably connected to the side wall of the fixing plate (51); the output end of the connecting rod (5) is rotatably connected to the fixing plate (51), and the connecting rod (5) is divided into two parts, one part is the shell and the other part is the screw, which are connected by threads.

3. The cantilever box girder inner formwork support device according to claim 2, characterized in that: A first graphite plate (6) is fixedly connected to the inner wall of the sliding groove (31); a second graphite plate (61) is fixedly connected to the inner wall of the sliding groove (31); the first graphite plate (6) and the second graphite plate (61) are slidably connected to the fixing buckle (32).

4. The inner formwork support device for a cantilevered box girder according to claim 3, characterized in that: The side wall of the fixed block (21) is provided with a dustproof net (7); the dustproof net (7) is fixed to the side wall of the fixed block (21); the dustproof net (7) is located at the end of the air inlet (26).

5. The cantilever box girder inner formwork support device according to claim 4, characterized in that: The top of the extrusion rod (24) is provided with a rubber pad (8); the rubber pad (8) is fixed to the top of the extrusion rod (24).

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