A construction method for a long-span prestressed bent cap

Abstract

The present invention belongs to the technical field of bridge construction, and specifically relates to a construction method for a large-span prestressed capping beam, including: S1: Erect a scaffold on the upper side of the pier foundation, splice and assemble the bottom formwork and the side formwork of the capping beam on the upper side of the scaffold, and fix the steel bar framework inside the capping beam; S2: By pressing the pressure plate on the side of the formwork, the sealant inside the rodless cavity of the pressure box is squeezed into the joint between the formworks through a plurality of guide holes, so that the joint is filled with the sealant; S3: Pour concrete into the formwork. After the concrete reaches the predetermined strength, remove all the formworks and scaffolds in sequence, and the capping beam can be formed. The sealant is squeezed into the joint between the formworks through the pressure box and a plurality of guide holes, and the sealant is extruded and filled from the inside of the joint to the outside, which can effectively discharge the air inside the joint, better fill the joint, improve the uniformity of the distribution of the sealant inside the joint, and thus improve the sealing performance of the formwork.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge construction, and specifically relates to a construction method for a long-span prestressed capping beam. Background Technique

[0002] With the rapid development of urban transportation, viaducts have been adopted by more and more cities and are the preferred solution for urban expressways. The capping beam is an important component connecting the bridge body and the pier column in the bridge structure and plays a role in connecting the upper and lower parts.

[0003] When the formwork used in the construction of long-span prestressed capping beams in the prior art is spliced, it is necessary to manually apply sealant into the joints between the formworks to improve the sealing performance of the formwork and prevent the leakage of concrete during concrete pouring. However, manual application has high technical requirements for construction workers, and usually squeezes the sealant into the joints from the outside, making it difficult to discharge the air inside the joints, which easily leads to the problem of uneven distribution of the sealant inside the joints, resulting in poor sealing performance of the formwork.

[0004] Therefore, the present invention provides a construction method for a long-span prestressed capping beam. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background technique.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A construction method for a long-span prestressed capping beam according to the present invention includes the following steps:

[0007] S1: Erect a support on the upper side of the pier foundation, splice and assemble the bottom formwork and the side formwork of the capping beam on the upper side of the support, and fix the steel bar framework inside the capping beam;

[0008] S2: By pressing the pressing plate on the side of the formwork, the sliding plate slides inside the pressure box, and then the sealant inside the rodless cavity of the pressure box is squeezed into the joint between the formworks through a plurality of guide holes, so that the sealant fills the joint, and then scrape off the excess sealant outside the joint;

[0009] S3: After the sealant dries, check the sealing performance of the formwork, pour concrete into the formwork. When the concrete reaches the predetermined strength, remove all the formworks and supports in sequence, and a capping beam can be formed.

[0010] When the formwork used in the construction of large-span prestressed capping beams in the prior art is spliced, it is necessary to manually apply sealant into the joints between the formworks to improve the sealing performance of the formwork and prevent the leakage of concrete during concrete pouring. However, manual application has relatively high technical requirements for construction workers, and usually the sealant is squeezed into the joints from the outside, making it difficult to expel the air inside the joints, which easily leads to the problem of uneven distribution of the sealant inside the joints, resulting in poor sealing performance of the formwork; at this time, in this method, the sealant is squeezed into the joints between the formworks through a pressure box and multiple guide holes, and the sealant is extruded and filled from the inside to the outside of the joints, which can effectively expel the air inside the joints, better fill the joints, improve the uniformity of the distribution of the sealant inside the joints, and thus improve the sealing performance of the formwork.

[0011] Preferably, the formwork includes a body; a pressure box is fixedly connected to the outside of the body; a sliding plate is slidably and sealingly connected inside the pressure box; a spring is fixedly connected between the side of the sliding plate close to the body and the end of the pressure box; a connecting rod is fixedly connected to the side of the sliding plate away from the body; the end of the connecting rod extending outside the pressure box is fixedly connected with a pressing plate, and the connecting rod is slidably and sealingly connected between the end of the pressure box; sealant is added to the rodless cavity of the pressure box; a group of guide holes are evenly distributed at the joints on the four sides of the body, and the guide holes are communicated with the rodless cavity of the pressure box through pipelines; after the formwork is spliced and assembled, by pressing the pressing plate and pressing the connecting rod into the pressure box, the sliding plate slides inside the pressure box, and then the sealant in the rodless cavity of the pressure box is squeezed into the joints between the formworks through multiple guide holes, so that the joints are filled with the sealant, and then the excess sealant outside the joints is scraped off. This formwork extrudes and fills the sealant from the inside to the outside of the joints, which can effectively expel the air inside the joints, better fill the joints, improve the uniformity of the distribution of the sealant inside the joints, and thus improve the sealing performance of the formwork.

[0012] Preferably, a storage box is fixedly connected to the outside of the body, and sealant is added to the storage box; the storage box is communicated with the rodless cavity of the pressure box through a conduit; one-way valves are installed inside both the guide holes and the conduit; when the connecting rod is pushed into the pressure box through the pressing plate and the pressing plate is kept fixed, the sealant in the rodless cavity of the pressure box is squeezed into the joints between the formworks through the guide holes. After the construction is completed and the formwork is removed, the spring pushes the sliding plate to reset inside the pressure box, and then a negative pressure is generated inside the rodless cavity of the pressure box, and the sealant in the storage box is re-sucked into the rodless cavity of the pressure box through the conduit, and this cycle is repeated to achieve the purpose of replenishing the sealant for the pressure box, so that this formwork and the glue application structure can be reused.

[0013] Preferably, a chamfer is provided at the outlet end of the guide hole; a flexible ball is arranged inside the chamfer; the diameter of the flexible ball is larger than that of the guide hole; an elastic cord I is fixedly connected between the side wall of the guide hole and the side of the flexible ball close to the guide hole, and the elastic cord I is in a tensioned state; after the slide plate squeezes the sealant inside the rodless cavity of the pressure box into the guide hole, the pressure of the sealant directly pushes the flexible ball away, so that the sealant can smoothly enter the joint, and the flexible ball can disperse the liquid flow of the sealant, increasing the spraying area of the sealant and further improving the distribution uniformity of the sealant inside the joint. When the subsequent sealant spraying is completed, there is still residual sealant inside the guide hole. At this time, the elastic cord I pulls the flexible ball tightly against the side of the guide hole again, thereby blocking the guide hole and avoiding the problem that the residual sealant inside the guide hole is difficult to clean after contacting the external air and hardening inside the guide hole.

[0014] Preferably, flexible pads are fixedly connected to the joints on the four sides of the body; the chamfer of the guide hole penetrates through the flexible pads; air slots are formed inside the flexible pads, and air is filled inside the air slots; by arranging the flexible pads, after the sealant is squeezed between a pair of flexible pads of adjacent templates, the sealant can generate flexible extrusion with the flexible pads, so as to more effectively discharge the air inside the joint and further fill the joint densely.

[0015] Preferably, an elastic air ring is fixedly connected to the side of the pressing plate close to the pressure box, and air is filled inside the elastic air ring; a group of air holes are evenly distributed at the joints on the four sides of the body; one end of each air hole is communicated with the elastic air ring through a pipeline, and the other end is communicated with the air slot; when the pressing plate is pressed towards the pressure box, the elastic air ring will be squeezed by the pressing plate and the pressure box, and then the air inside the elastic air ring will be squeezed into the air slot inside the flexible pad through the air hole, causing the flexible pad to expand slightly, so as to further squeeze and seal the sealant between the flexible pads, fill the gaps between the sealants, and improve the sealing degree of the template.

[0016] Preferably, a slider is slidably and sealingly connected inside the outlet end of the air hole; a damping hole is formed inside the slider; an elastic cord II is fixedly connected between the side wall of the air hole and the side of the slider away from the flexible pad; a pair of reed pieces are fixedly connected to the side of the slider close to the flexible pad; the ends of the pair of reed pieces away from the slider are separated from each other and extend into the air slot, and the reed pieces are attached to the side wall of the air slot; a group of convex points are evenly distributed at the position of the side wall of the air slot close to the reed pieces, and the surface of the convex points is provided with an arc surface; due to the small aperture of the damping hole, when the air fills into the air slot through the air hole, the air flow will push the slider to slide inside the air hole while passing through the damping hole, and then the included angle between the pair of reed pieces increases, and the end of the reed piece slides and rubs on the surface of the side wall of the air slot. When the reed piece passes over the convex point, it will cause the flexible pad to generate a jitter effect, so that the sealant between the flexible pads is further dispersed and evenly distributed, improving the filling degree of the sealant to the joint.

[0017] Preferably, an arc-shaped lug is fixedly connected to one end of the reed close to the side wall of the air gap; by providing the lug, the end of the reed can smoothly transition when squeezing the bump, reducing the friction between the reed and the bump, and avoiding the problem that the end of the reed cannot cross the bump due to excessive friction.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. For the large-span prestressed capping beam construction method of the present invention, the sealant is squeezed into the joint between the templates through the pressure box and multiple guide holes, and the sealant is squeezed and filled from the inside of the joint to the outside, which can effectively discharge the air inside the joint, better fill the joint, improve the uniformity of the sealant distribution inside the joint, and thus improve the sealing performance of the template.

[0020] 2. For the large-span prestressed capping beam construction method of the present invention, when the connecting rod is pushed into the pressure box through the pressing plate and then the pressing plate is kept fixed, the sealant in the rodless cavity of the pressure box is squeezed into the joint between the templates through the guide holes. When the construction is completed and the template is removed, the spring pushes the sliding plate to reset inside the pressure box, and then a negative pressure is generated inside the rodless cavity of the pressure box, and the sealant in the storage box is re-sucked into the rodless cavity of the pressure box through the conduit, and this cycle is repeated to achieve the purpose of replenishing the sealant for the pressure box, so that the template and the glue application structure can be reused. Description of the Drawings

[0021] The present invention will be further described below with reference to the drawings.

[0022] Figure 1 is the schematic flow chart of the construction method of the present invention;

[0023] Figure 2 is the three-dimensional view of the template in the present invention;

[0024] Figure 3 is the three-dimensional view of the template from another perspective in the present invention;

[0025] Figure 4 is Figure 3 the partial enlarged view at A in

[0026] Figure 5 is Figure 3 the partial enlarged view at B in

[0027] Figure 6 is the cross-sectional view of the air hole in the present invention;

[0028] Figure 7 is the three-dimensional view of the slider and the reed in the present invention.

[0029] In the figure: body 1, pressure box 2, sliding plate 3, spring 4, connecting rod 5, pressing plate 6, guide hole 7, storage box 8, conduit 9, chamfer 10, flexible ball 11, first elastic rope 12, flexible pad 13, air gap 14, elastic air ring 15, air hole 16, slider 17, damping hole 18, second elastic rope 19, reed 20, bump 21, lug 22. Specific implementation manner

[0030] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0031] As Figure 1 shown, a construction method for a long-span prestressed capping beam includes the following steps:

[0032] S1: Erect a scaffold on the upper side of the pier foundation, splice and assemble the bottom formwork and side formwork of the capping beam on the upper side of the scaffold, and fix the steel bar framework inside the capping beam;

[0033] S2: By pressing the pressing plate 6 on the side of the formwork, the sliding plate 3 slides inside the pressure box 2, and then the sealant inside the rodless cavity of the pressure box 2 is squeezed into the joint between the formworks through a plurality of guide holes 7, so that the sealant fills the joint, and then the excess sealant outside the joint is scraped off;

[0034] S3: After the sealant dries, check the tightness of the formwork, pour concrete into the formwork, and after the concrete reaches the predetermined strength, remove all the formworks and scaffolds in sequence to form the capping beam.

[0035] When the formworks used in the construction of long-span prestressed capping beams in the prior art are spliced, it is necessary to manually apply sealant into the joints between the formworks to improve the tightness of the formworks and prevent the concrete from leaking out when pouring the concrete. However, manual application has high technical requirements for construction workers, and usually the sealant is squeezed into the joints from the outside, making it difficult to discharge the air inside the joints, which easily leads to the problem of uneven distribution of the sealant inside the joints, resulting in poor tightness of the formworks; at this time, in this method, the sealant is squeezed into the joints between the formworks through the pressure box 2 and a plurality of guide holes 7, and the sealant is squeezed and filled from the inside to the outside of the joints, which can effectively discharge the air inside the joints, better fill the joints, improve the uniformity of the distribution of the sealant inside the joints, and thus improve the sealing performance of the formworks.

[0036] Embodiment 1

[0037] As Figures 2 to 5As shown in the figure, an embodiment of the present invention is as follows: The template includes a body 1; a pressure box 2 is fixedly connected to the outside of the body 1; a sliding plate 3 is slidably and sealingly connected inside the pressure box 2; a spring 4 is fixedly connected between the side of the sliding plate 3 close to the body 1 and the end of the pressure box 2; a connecting rod 5 is fixedly connected to the side of the sliding plate 3 away from the body 1; the end of the connecting rod 5 extending outside the pressure box 2 is fixedly connected with a pressing plate 6, and the connecting rod 5 is slidably and sealingly connected with the end of the pressure box 2; sealant is added to the rodless cavity of the pressure box 2; a group of guide holes 7 are evenly distributed at the joints on the four sides of the body 1, and the guide holes 7 are communicated with the rodless cavity of the pressure box 2 through pipelines; after the templates are spliced and assembled, by pressing the pressing plate 6 and pressing the connecting rod 5 into the pressure box 2, the sliding plate 3 slides inside the pressure box 2, and then the sealant in the rodless cavity of the pressure box 2 is squeezed into the joints between the templates through the multiple guide holes 7, so that the sealant fills the joints, and then the excess sealant outside the joints is scraped off. This template extrudes and fills the sealant from the inside to the outside of the joint, which can effectively discharge the air inside the joint, better fill the joint, improve the uniformity of the distribution of the sealant inside the joint, and thus improve the sealing performance of the template.

[0038] A storage box 8 is fixedly connected to the outside of the body 1, and sealant is added to the storage box 8; the storage box 8 is communicated with the rodless cavity of the pressure box 2 through a conduit 9; one-way valves are installed inside both the guide holes 7 and the conduit 9; when the connecting rod 5 is pushed into the pressure box 2 through the pressing plate 6 and the pressing plate 6 is kept fixed, the sealant in the rodless cavity of the pressure box 2 is squeezed into the joints between the templates through the guide holes 7. After the construction is completed and the templates are removed, the spring 4 pushes the sliding plate 3 to reset inside the pressure box 2, and then a negative pressure is generated inside the rodless cavity of the pressure box 2, and the sealant in the storage box 8 is re-sucked into the rodless cavity of the pressure box 2 through the conduit 9, and this cycle is repeated to achieve the purpose of replenishing the sealant for the pressure box 2, so that this template and the glue application structure can be reused.

[0039] A chamfer 10 is provided at the outlet end of the guide hole 7; a flexible ball 11 is provided inside the chamfer 10; the diameter of the flexible ball 11 is larger than the diameter of the guide hole 7; an elastic cord 12 is fixedly connected between the side wall of the guide hole 7 and the side of the flexible ball 11 close to the guide hole 7, and the elastic cord 12 is in a tensioned state; when the slide plate 3 squeezes the sealant inside the rodless cavity of the pressure box 2 into the guide hole 7, the pressure of the sealant directly pushes the flexible ball 11 away, so that the sealant can smoothly enter the joint, and the flexible ball 11 can disperse the liquid flow of the sealant, increasing the spraying area of the sealant and further improving the uniformity of the distribution of the sealant inside the joint. When the subsequent sealant spraying is completed, there is still residual sealant inside the guide hole 7. At this time, the elastic cord 12 pulls the flexible ball 11 tightly against the side of the guide hole 7 again, thereby blocking the guide hole 7 and avoiding the problem that the residual sealant inside the guide hole 7 hardens inside the guide hole 7 and is difficult to clean after contacting the external air.

[0040] Flexible pads 13 are fixedly connected to the joints on the four sides of the body 1; the chamfer 10 of the guide hole 7 penetrates through the flexible pads 13; air gaps 14 are provided inside the flexible pads 13, and the air gaps 14 are filled with air; by providing the flexible pads 13, after the sealant is squeezed between a pair of flexible pads 13 of adjacent templates, the sealant can produce a flexible extrusion with the flexible pads 13, thereby more effectively discharging the air inside the joint and further filling the joint densely.

[0041] An elastic air ring 15 is fixedly connected to the side of the pressing plate 6 close to the pressure box 2, and the elastic air ring 15 is filled with air; a group of air holes 16 are evenly distributed at the joints on the four sides of the body 1; one end of the air hole 16 is communicated with the elastic air ring 15 through a pipeline, and the other end is communicated with the air gap 14; when the pressing plate 6 is pressed towards the pressure box 2, the elastic air ring 15 will be squeezed by the pressing plate 6 and the pressure box 2, and then the air inside the elastic air ring 15 will be squeezed into the air gap 14 inside the flexible pad 13 through the air hole 16, causing the flexible pad 13 to expand slightly, thereby further squeezing and sealing the sealant between the flexible pads 13, filling the gaps between the sealants, and improving the sealing degree of the template.

[0042] Embodiment 2

[0043] As Figures 6 to 7As shown, compared with the first comparative example, another implementation manner of the present invention is as follows: A slider 17 is slidably and sealingly connected inside the outlet end of the air hole 16; a damping hole 18 is formed inside the slider 17; an elastic cord two 19 is fixedly connected between the side of the slider 17 away from the flexible pad 13 and the side wall of the air hole 16; a pair of reed pieces 20 are fixedly connected to the side of the slider 17 close to the flexible pad 13; one ends of the pair of reed pieces 20 away from the slider 17 are away from each other and extend into the air gap 14, and the reed pieces 20 are in contact with the side wall of the air gap 14; a group of bumps 21 are evenly distributed on the side wall of the air gap 14 close to the reed pieces 20, and the surface of the bumps 21 is provided with an arc surface; due to the small aperture of the damping hole 18, when air is filled into the air gap 14 through the air hole 16, the air flow will pass through the damping hole 18 while pushing the slider 17 to slide inside the air hole 16, thereby increasing the included angle between the pair of reed pieces 20. The end of the reed piece 20 slides and rubs on the surface of the side wall of the air gap 14. When the reed piece 20 passes over the bump 21, it will cause the flexible pad 13 to produce a shaking effect, so that the sealant between the flexible pads 13 is further dispersed and evenly distributed, improving the filling degree of the sealant to the joint.

[0044] An arc-shaped lug 22 is fixedly connected to the end of the reed piece 20 close to the side wall of the air gap 14; by providing the lug 22, the end of the reed piece 20 can smoothly transition when squeezing the bump 21, reducing the friction between the reed piece 20 and the bump 21, and avoiding the problem that the end of the reed piece 20 cannot pass over the bump 21 due to excessive friction.

[0045] Working principle: After the templates are spliced and assembled, by pressing the pressing plate 6 and pressing the connecting rod 5 into the interior of the pressure box 2, the sliding plate 3 slides inside the pressure box 2, and then the sealant in the rodless cavity of the pressure box 2 is extruded into the joint between the templates through a plurality of guide holes 7, so that the sealant fills the joint, and then the excess sealant outside the joint is scraped off. This template extrudes the sealant from the inside of the joint to the outside for filling, which can effectively discharge the air inside the joint, better fill the joint, improve the uniformity of the distribution of the sealant inside the joint, and thus improve the sealing performance of the template; When the connecting rod 5 is pushed into the interior of the pressure box 2 through the pressing plate 6, the pressing plate 6 is kept fixed. The sealant in the rodless cavity of the pressure box 2 is extruded into the joint between the templates through the guide holes 7. After the construction is completed and the template is removed, the spring 4 pushes the sliding plate 3 to reset inside the pressure box 2. Then, a negative pressure is generated inside the rodless cavity of the pressure box 2, and the sealant in the storage tank 8 is re-sucked into the rodless cavity of the pressure box 2 through the conduit 9, and this cycle is repeated to achieve the purpose of replenishing the sealant for the pressure box 2, so that this template and the glue application structure can be reused; When the sliding plate 3 extrudes the sealant in the rodless cavity of the pressure box 2 into the guide holes 7, the pressure of the sealant directly pushes open the flexible ball 11, and then the sealant can be smoothly extruded into the joint, and the flexible ball 11 can disperse the liquid flow of the sealant, increasing the spraying area of the sealant, and further improving the uniformity of the distribution of the sealant inside the joint. When the subsequent sealant spraying is completed, there is still residual sealant inside the guide holes 7. At this time, the elastic cord 1 will re-tighten the flexible ball 11 on the side of the guide holes 7, thus blocking the guide holes 7, avoiding the problem that the residual sealant inside the guide holes 7 is in contact with the external air and hardens inside the guide holes 7 and is difficult to clean; By setting the flexible pads 13, after the sealant is extruded between a pair of flexible pads 13 of adjacent templates, the sealant can produce a flexible extrusion with the flexible pads 13, so as to more effectively discharge the air inside the joint and further fill the joint densely; When the pressing plate 6 is pressed towards the pressure box 2, the elastic air ring 15 will be squeezed by the pressing plate 6 and the pressure box 2, and then the air inside the elastic air ring 15 is squeezed into the air gap 14 inside the flexible pad 13 through the air holes 16, so that the flexible pad 13 expands slightly, thereby further squeezing and sealing the sealant between the flexible pads 13, filling the gap between the sealants, and improving the sealing degree of the template; Due to the small aperture of the damping hole 18, when the air fills into the air gap 14 through the air holes 16, the air flow will pass through the damping hole 18 while pushing the slider 17 to slide inside the air holes 16, and then the included angle between a pair of reed pieces 20 increases. The end of the reed piece 20 slides and rubs on the side wall surface of the air gap 14. When the reed piece 20 passes over the convex point 21, it will cause the flexible pad 13 to produce a shaking effect, so that the sealant between the flexible pads 13 is further dispersed and evenly distributed, improving the filling degree of the sealant for the joint;By providing the lug 22, the end of the reed 20 can smoothly transition when squeezing the bump 21, reducing the friction between the reed 20 and the bump 21, and avoiding the problem that the end of the reed 20 cannot cross over the bump 21 due to excessive friction.

[0046] The above front, back, left, right, up, and down are all based on the Figure 1 description in the accompanying drawings of the specification. Taking the perspective of the observer as the standard, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0047] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0048] The above has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for a long-span prestressed capping beam, characterized in that: It includes the following steps: S1: Erect a support on the upper side of the pier foundation, splice and assemble the bottom formwork and side formwork of the capping beam on the upper side of the support, and fix the steel bar framework inside the capping beam; S2: By pressing the pressing plate (6) on the side of the formwork, the sliding plate (3) slides inside the pressure box (2), and then the sealant inside the rodless cavity of the pressure box (2) is squeezed into the joint between the formworks through a plurality of guide holes (7), so that the joint is filled with the sealant, and then the excess sealant outside the joint is scraped off; S3: After the sealant dries, check the tightness of the formwork, pour concrete into the formwork. When the concrete reaches the predetermined strength, remove all the formworks and supports in sequence, and then the capping beam can be formed; The formwork includes a body (1); a pressure box (2) is fixedly connected to the outside of the body (1); a sliding plate (3) is slidably and sealingly connected inside the pressure box (2); a spring (4) is fixedly connected between the side of the sliding plate (3) close to the body (1) and the end of the pressure box (2); a connecting rod (5) is fixedly connected to the side of the sliding plate (3) away from the body (1); a pressing plate (6) is fixedly connected to the end of the connecting rod (5) extending outside the pressure box (2), and the connecting rod (5) is slidably and sealingly connected between the end of the pressure box (2); sealant is added inside the rodless cavity of the pressure box (2); a group of guide holes (7) are evenly distributed at the joints on the four sides of the body (1), and the guide holes (7) are communicated with the rodless cavity of the pressure box (2) through pipelines; A chamfer (10) is arranged at the outlet end of the guide hole (7); a flexible ball (11) is arranged inside the chamfer (10); the diameter of the flexible ball (11) is larger than the diameter of the guide hole (7); an elastic cord one (12) is fixedly connected between the side of the flexible ball (11) close to the guide hole (7) and the side wall of the guide hole (7), and the elastic cord one (12) is in a tensioned state; A flexible pad (13) is fixedly connected to the joints on the four sides of the body (1); the chamfer (10) of the guide hole (7) penetrates through the flexible pad (13); an air gap (14) is formed inside the flexible pad (13), and air is filled inside the air gap (14).

2. The construction method of a long-span prestressed bent cap according to claim 1, characterized in that: A storage box (8) is fixedly connected to the outside of the body (1), and sealant is added inside the storage box (8); the storage box (8) is communicated with the rodless cavity of the pressure box (2) through a conduit (9); check valves are installed inside both the guide hole (7) and the conduit (9).

3. A construction method for a long-span prestressed capping beam according to claim 2, characterized in that: An elastic air ring (15) is fixedly connected to the side of the pressing plate (6) close to the pressure box (2), and air is filled inside the elastic air ring (15); a group of air holes (16) are evenly distributed at the joints on the four sides of the body (1); one end of the air hole (16) is communicated with the elastic air ring (15) through a pipeline, and the other end is communicated with the air gap (14).

4. A construction method for a long-span prestressed bent cap according to claim 3, characterized in that: A slider (17) is slidably and sealingly connected inside the outlet end of the air hole (16); a damping hole (18) is formed inside the slider (17); an elastic cord II (19) is fixedly connected between the side of the slider (17) away from the flexible pad (13) and the side wall of the air hole (16); a pair of reed pieces (20) are fixedly connected to the side of the slider (17) close to the flexible pad (13); one ends of the pair of reed pieces (20) away from the slider (17) are away from each other and extend into the air gap (14), and the reed pieces (20) are attached to the side wall of the air gap (14); a group of convex points (21) are evenly distributed on the side wall of the air gap (14) close to the reed pieces (20), and the surface of the convex points (21) is provided with an arc surface.

5. A construction method for a long-span prestressed capping beam according to claim 4, characterized in that: An arc-shaped lug (22) is fixedly connected to one end of the reed piece (20) close to the side wall of the air gap (14).

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