Fabricated supporting device for supporting beam end of prestressed concrete box beam

Abstract

The utility model discloses an assembly type supporting device used for supporting the beam end of a prestressed concrete box beam. The assembly type supporting device comprises an arc-shaped hinge and a groove matched with the arc-shaped hinge. The arc-shaped winch top face is a plane extending horizontally and transversely, the arc-shaped winch bottom is provided with a first arc face, the groove is formed in the base, the inner surface of the groove is provided with a second arc face, and the first arc face is matched with the second arc face. The base is used for being detachably connected to the top face of a hard support, and the top face of the arc-shaped hinge is used for making contact with the bottom face of a prestressed concrete box girder. According to the utility model, the problems that in the prior art, when the upwarp phenomenon occurs at the beam end of the prefabricated prestressed concrete box beam, the corresponding supporting force direction adjustment of the beam end support cannot be carried out according to the upwarp deformation condition of the prefabricated prestressed concrete box beam can be solved; and the beam end of the prefabricated prestressed concrete box beam is easily pressed and cracks are generated.

Description

Technical Field

[0001] The utility model relates to the field of prestressed concrete box girder manufacturing, in particular to an assembled supporting device for supporting the beam end of the prestressed concrete box girder. Background Art

[0002] Prestressed concrete box girders have been widely used in modern bridge construction. Common prestressed concrete box girders often include the following parts: beam body, prestressed tendons, top plate, bottom plate, web plate, etc. Among them, the beam body is the main part of the box girder, usually composed of one or more box-section concrete beams; prestressed tendons are the core feature of prestressed concrete box girders, usually made of high-strength steel strands or steel bars. Before the concrete hardens, these tendons are stretched and fixed in the beam body to introduce prestress. This prestress can effectively improve the bearing capacity of the beam, reduce the occurrence of cracks, and enhance the durability of the structure.

[0003] Prestressed concrete box girders not only have a high bearing capacity, but also have good durability and a long span capacity. Prestressed concrete box girders allow the box girders to be manufactured in advance at the prefabrication site and then directly installed to the designated location at the bridge construction site, thereby significantly shortening the construction period and becoming a widely used structural form in modern bridge engineering.

[0004] like Figure 1 As shown, the box girder deflection phenomenon may occur due to the coupling effect of prestressed tendons 101 and beam shrinkage creep. According to national standards, prefabricated concrete box girders must be stored for at least 6 months before installation. During the 6-month storage period of the prefabricated concrete box girders, since the prefabricated prestressed concrete box girders currently adopt the form of setting up supports at the bottom and prefabricating the prestressed concrete box girders on the upper part of the supports, there is no special treatment method for this deflection phenomenon. Since the two ends of the prefabricated prestressed concrete box girder cannot make corresponding adjustments to the direction of the supporting force according to the deflection deformation of the prefabricated prestressed concrete box girder 100, the beam ends of the prefabricated prestressed concrete box girder will be compressed and cracks 102 will occur.

[0005] In addition, changes in ambient temperature and shrinkage deformation of concrete will also cause shrinkage deformation of prefabricated prestressed concrete box girders. If the prefabricated prestressed concrete box girders do not take appropriate measures to adjust the direction of their supporting force according to the natural shrinkage deformation of the beam body, cracks may also appear in the prefabricated prestressed concrete box girders.

[0006] Once cracks appear in the prefabricated prestressed concrete box girder due to the above reasons, it may seriously affect the durability of the prefabricated prestressed concrete box girder, increase operational risks, and lead to increased maintenance costs.

[0007] According to the current situation, there is currently a lack of effective solutions to prevent the occurrence of cracks at the ends of box girders. Therefore, developing a device that can timely adjust the direction of the supporting force on the ends of prefabricated prestressed concrete box girders will help avoid cracks at the ends of the girders, thereby improving the overall quality of the prestressed concrete box girders. Utility Model Content

[0008] The utility model aims to provide an assembled supporting device for supporting the beam ends of prestressed concrete box girders, so as to solve the technical problem in the prior art that when the beam ends of prefabricated prestressed concrete box girders are subjected to deflection, the beam end supports cannot make corresponding adjustments in the direction of the supporting force according to the deflection deformation of the prefabricated prestressed concrete box girders, which easily causes the beam ends of the prefabricated prestressed concrete box girders to be compressed and cracked.

[0009] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0010] The utility model discloses an assembled support device for supporting the end of a prestressed concrete box beam, comprising an arc-shaped twist and a groove matched with the arc-shaped twist;

[0011] The arc-shaped twisted top surface is a horizontally extending plane, the arc-shaped twisted bottom has a first arc surface, the groove is arranged in the base, the inner surface of the groove has a second arc surface, and the first arc surface matches the second arc surface;

[0012] The base is used for being detachably connected to the top surface of the hard support, and the top surface of the arc-shaped strand is used for contacting the bottom surface of the prestressed concrete box beam.

[0013] The assembled support device disclosed by the utility model is easy to install. When the prestressed concrete box girder shows upward deflection due to the coupling effect of prestressed tendons and shrinkage creep of the beam body, the deformation movement of the prestressed concrete box girder can drive the arc hinge in the assembled support device to rotate in the groove, so that the direction of the supporting force on the beam end can be adjusted in time, the uneven force on the beam end can be reduced, and the occurrence of cracks at the beam end of the prestressed concrete box girder can be effectively avoided.

[0014] As one of the implementations of the arc-shaped strand and the base structure, the top surface of the arc-shaped strand is a first steel plate, the first arc surface is a first arc-shaped steel plate, the first steel plate and the first arc-shaped steel plate are combined to form a first frame structure, and the first frame structure is a semicircular frame structure;

[0015] The base includes a bottom plate, a first side plate and a second side plate, the second curved surface is a second curved steel plate, the bottom plate, the first side plate, the second side plate and the second curved steel plate are connected end to end to form a second frame structure, the bending radius of the first curved steel plate matches that of the second curved steel plate, and after installation is completed, the first curved steel plate is in contact with the second curved steel plate.

[0016] Such a frame structure has a simple structure, is convenient for on-site production, can improve construction efficiency, and can also ensure adjustable support for the ends of the prestressed concrete box beams.

[0017] In order to further increase the structural strength of the first frame structure and the second frame structure and extend the service life, as a preferred solution for the first frame structure and the second frame structure, a plurality of first vertical steel plates and a plurality of first horizontal steel plates are respectively fixed inside the first frame structure, and each of the first vertical steel plates and each of the first horizontal steel plates are cross-fixed vertically to provide structural support for the inside of the first frame structure;

[0018] A plurality of second vertical steel plates and a plurality of second transverse steel plates are fixed inside the second frame structure respectively, and each of the second vertical steel plates and each of the second transverse steel plates are cross-fixed vertically to provide structural support for the interior of the second frame structure.

[0019] In order to increase the lubrication of the arc twister rotating in the groove, as a preferred solution for the arc twister and the base, a first polytetrafluoroethylene plate is also provided between the first arc steel plate and the second arc steel plate, and the first polytetrafluoroethylene plate is fixed to the first arc steel plate or the second arc steel plate.

[0020] The surface of the PTFE plate is smooth and the structural strength is large. It is not easily affected by moisture or chemicals and has stable chemical properties. The PTFE plate is arranged between the first curved steel plate and the second curved steel plate to increase the lubrication of the curved twist during rotation, and to make the adjustment of the supporting force of the beam end more timely and labor-saving.

[0021] As one of the implementation methods for making the top surface of the arc-shaped strand contact with the bottom surface of the prestressed concrete box girder, a first bolt hole is provided on the first steel plate, and a corresponding first external thread screw is pre-embedded in the corresponding bottom surface of the prestressed concrete box girder. The first external thread screw can pass through the first bolt hole, and the arc-shaped strand is detachably connected to the bottom surface of the prestressed concrete box girder through the first bolt, so that the top surface of the arc-shaped strand is in contact with the bottom surface of the prestressed concrete box girder.

[0022] When the prestressed concrete box girder deflects upward and rotates, the arc-shaped twisted part rotates in the groove under the action of the bolt force, so that the assembled support device can provide adaptive support force to the structure of the prestressed concrete box girder in time. When the prestressed concrete box girder needs to be transported to other places, the bolts can be removed.

[0023] As one of the implementation methods of the top surface of the arc-shaped twisted beam contacting the bottom surface of the prestressed concrete box girder, the top surface of the arc-shaped twisted beam can be in sliding contact with the bottom surface of the prestressed concrete box girder. In specific implementation, an arc-shaped twisted beam is provided at each end of the prestressed concrete box girder, and the prestressed concrete box girder is erected on the top surfaces of the arc-shaped twisted beams at both ends. This method has the following beneficial effects. First, the prestressed concrete box girder can slide relative to the top surface of the arc-shaped twisted beam. Then, when the prestressed concrete box girder undergoes horizontal deformation, the prestressed concrete box girder can slide freely in the horizontal direction. When the upward deflection phenomenon occurs and the rotational deformation occurs, the arc-shaped twisted beam is driven to rotate in the groove under the action of friction. In this way, the assembled support device can adapt to deformation in multiple directions, improve the applicable occasions, and further provide the necessary support force for the structure of the prestressed concrete box girder. Second, when the prestressed concrete box girder needs to be transported to other places, the prestressed concrete box girder can be directly lifted and transported without disassembly, thereby further reducing the workload.

[0024] In order to increase the lubricity between the top surface of the arc-shaped twist and the bottom surface of the prestressed concrete box girder, as a preferred solution, a second PTFE plate is fixed to the upper surface of the first steel plate, and the upper surface of the second PTFE plate is used to contact the bottom surface of the prestressed concrete box girder.

[0025] As one of the implementation methods of detachably connecting the base to the top surface of the rigid support, a second bolt hole is opened on the bottom plate, and a corresponding second external screw is pre-embedded in the top surface of the corresponding rigid support. The external screw can pass through the second bolt hole, and the base is detachably connected to the rigid support through the second bolt.

[0026] Preferably, the hard support is a concrete block or a steel structure.

[0027] The technical solution of the utility model has the following beneficial effects: the assembled support device of the utility model for supporting the beam end of the prestressed concrete box girder can solve the technical problem in the prior art that when the deflection phenomenon occurs at the beam end of the prefabricated prestressed concrete box girder, the beam end support cannot make corresponding adjustment of the supporting force direction according to the deflection deformation of the prefabricated prestressed concrete box girder, which easily leads to compression and cracking of the beam end of the prefabricated prestressed concrete box girder; the assembled support device has a simple structure, is easy to operate, and can be recycled; the arc hinge in the assembled support device can rotate in the groove, which can well adapt to the deformation of the prestressed tendon box girder and prevent compression cracks caused by local compression of the beam end. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings, in which:

[0029] Figure 1 It is a schematic diagram of the deflection phenomenon of prestressed concrete box girder in the prior art.

[0030] Figure 2 It is a schematic diagram of an application scenario of the assembled support device of the utility model.

[0031] Figure 3 It is a schematic diagram of the structure of the assembled support device of the utility model.

[0032] Figure 4 for Figure 3 Enlarged view of area A in the middle.

[0033] Figure 5 This is a schematic diagram of the first frame structure of the utility model.

[0034] Figure 6 It is a schematic diagram of the second frame structure of the utility model.

[0035] Figure 7 This is a schematic diagram of the rigid support structure of the utility model.

[0036] Figure 8 It is a schematic diagram of the connection method between the base and the hard support of the utility model.

[0037] Fig. 9 It is a schematic diagram of the connection method between the bottom surface of the prestressed concrete box girder and the arc-shaped twist connection of the utility model.

[0038] Explanation of the reference numerals: 100, prestressed concrete box girder; 101, prestressed tendons; 102, cracks; 103, box girder precast platform; 104, first external threaded screw; 105, first bolt; 200, assembled support device; 201, arc-shaped twist; 202, first steel plate; 203, first bolt hole; 204, first arc-shaped steel plate; 205, first vertical steel plate; 206, first horizontal steel plate; 207, base; 208, groove; 209, bottom plate; 210, second bolt hole; 211, first side plate; 212, second side plate; 213, second arc-shaped steel plate; 214, second vertical steel plate; 215, second horizontal steel plate; 216, first polytetrafluoroethylene plate; 217, second polytetrafluoroethylene plate; 218, hard support; 219, second external threaded screw; 220, second bolt. DETAILED DESCRIPTION

[0039] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of the assembled support device for supporting the end of a prestressed concrete box girder of the utility model in conjunction with the accompanying drawings.

[0040] The utility model can be applied to the construction of prefabricated prestressed concrete box girders, and solves the technical problem in the prior art that when the beam end of the prefabricated prestressed concrete box girder is subjected to deflection, the beam end support cannot make corresponding adjustment of the supporting force direction according to the deflection deformation of the prefabricated prestressed concrete box girder, which easily causes the beam end of the prefabricated prestressed concrete box girder to be compressed and cracked.

[0041] See also Figure 3 Based on the technical problems solved above, the utility model discloses an assembled supporting device 200 for supporting the end of a prestressed concrete box girder, comprising an arc-shaped twisted rod 201 and a groove 208 cooperating with the arc-shaped twisted rod 201; the top surface of the arc-shaped twisted rod 201 is a horizontally extending plane, the bottom of the arc-shaped twisted rod 201 has a first arc surface, the groove 208 is arranged in a base 207, the inner surface of the groove 208 has a second arc surface, and the first arc surface cooperates with the second arc surface; the base 207 is used for detachably connecting to the top surface of a hard support 218, and the top surface of the arc-shaped twisted rod 201 is used for contacting the bottom surface of the prestressed concrete box girder 100.

[0042] The assembled support device 200 disclosed in the utility model is easy to install. When the prestressed concrete box girder 100 is deflected due to the coupling effect of the prestressed tendons 101 and the shrinkage creep of the beam body, the deformation movement of the prestressed concrete box girder 100 can drive the arc hinge in the assembled support device 200 to rotate in the groove 208, so as to timely adjust the direction of the supporting force on the beam end, reduce the uneven force on the beam end, and effectively avoid the occurrence of cracks at the beam end of the prestressed concrete box girder 100.

[0043] Specifically, the cross beam of the prestressed concrete box beam 100 is prepared with a reserved end, and the web and bottom plate 209 are bolted to the remaining part of the cross beam, and the top plate is welded, which greatly saves welders and construction time. The bolted cross beam arch construction platform allows workers to directly weld the cross beam top plate on the top of the cross beam without the need to build an additional construction platform.

[0044] See also Figure 5 and Figure 6 , as one of the structures of the arc-shaped strand 201 and the base 207, the top surface of the arc-shaped strand 201 is a first steel plate 202, the first arc surface is a first arc-shaped steel plate 204, the first steel plate 202 and the first arc-shaped steel plate 204 are enclosed to form a first frame structure, and the first frame structure is a semicircular frame structure;

[0045] The base 207 includes a bottom plate 209, a first side plate 211 and a second side plate 212, the second curved surface is a second curved steel plate 213, the bottom plate 209, the first side plate 211, the second side plate 212 and the second curved steel plate 213 are connected end to end to form a second frame structure, the bending radius of the first curved steel plate 204 matches that of the second curved steel plate 213, and after installation, the first curved steel plate 204 is in contact with the second curved steel plate 213.

[0046] Such a frame structure has a simple structure, is convenient for on-site production, can improve construction efficiency, and can also ensure adjustable support for the ends of the prestressed concrete box girder 100.

[0047] See also Figure 5 In order to further increase the structural strength of the first frame structure and the second frame structure and extend the service life, as a preferred solution for the first frame structure and the second frame structure, a plurality of first vertical steel plates 205 and a plurality of first horizontal steel plates 206 are respectively fixed inside the first frame structure, and each of the first vertical steel plates 205 and each of the first horizontal steel plates 206 are cross-fixed vertically to provide structural support for the inside of the first frame structure;

[0048] See also Figure 6 A plurality of second vertical steel plates 214 and a plurality of second transverse steel plates 215 are fixed inside the second frame structure. Each of the second vertical steel plates 214 and each of the second transverse steel plates 215 are cross-fixed vertically to provide structural support for the interior of the second frame structure.

[0049] Specifically, each of the first vertical steel plates 205 and each of the first transverse steel plates 206 is vertically fixed by welding, and each of the second vertical steel plates 214 and each of the second transverse steel plates 215 is vertically fixed by welding.

[0050] Specifically, the structure of the arc-shaped strand 201 and the base 207 is first designed, and then a plurality of steel plates are manufactured and welded according to the structural design to obtain the first frame structure and the second frame structure of the arc-shaped strand 201 and the base 207, respectively. Finally, the first arc-shaped steel plate 204 and the second arc-shaped steel plate 213 are welded to the corresponding positions of the frame structures of the arc-shaped strand 201 and the base 207, respectively.

[0051] Specifically, the hard support 218 is a concrete block or a steel structure, and the specific height is determined according to actual needs.

[0052] See also Figure 3 and Figure 4In order to increase the lubrication of the arc twister 201 rotating in the groove 208, as a preferred solution for the arc twister 201 and the base 207, a first polytetrafluoroethylene plate 216 is also provided between the first arc steel plate 204 and the second arc steel plate 213, and the first polytetrafluoroethylene plate 216 is fixed on the first arc steel plate 204 or the second arc steel plate 213.

[0053] The surface of the PTFE plate is smooth and the structural strength is large. It is not easily affected by moisture or chemicals and has stable chemical properties. The PTFE plate is arranged between the first arc steel plate 204 and the second arc steel plate 213 to increase the lubrication of the arc twist 201 during rotation, and can make the adjustment of the supporting force of the beam end more timely and labor-saving.

[0054] See also Fig. 9 As one of the implementation methods for the top surface of the arc-shaped strand 201 to contact the bottom surface of the prestressed concrete box girder 100, a first bolt hole 203 is opened on the first steel plate 202, and a corresponding first external thread screw 104 is pre-embedded in the bottom surface of the corresponding prestressed concrete box girder 100. The first external thread screw 104 can pass through the first bolt hole 203, and the arc-shaped strand 201 is detachably connected to the bottom surface of the prestressed concrete box girder 100 through the first bolt 105, so that the top surface of the arc-shaped strand 201 is in contact with the bottom surface of the prestressed concrete box girder 100.

[0055] When the prestressed concrete box girder 100 is deflected and rotated, the arc-shaped twist 201 is driven to rotate in the groove 208 under the action of the bolt force, so that the assembled support device 200 can provide adaptive support force to the structure of the prestressed concrete box girder 100 in time. When the prestressed concrete box girder 100 needs to be transported to other places, the bolts can be removed.

[0056] See also Figure 2As one of the implementation methods of the top surface of the arc-shaped strand 201 contacting the bottom surface of the prestressed concrete box girder 100, the top surface of the arc-shaped strand 201 can be in sliding contact with the bottom surface of the prestressed concrete box girder 100. In specific implementation, an arc-shaped twist 201 is respectively provided at both ends of the prestressed concrete box girder 100, and the prestressed concrete box girder 100 is erected on the top surfaces of the arc-shaped twist 201 at both ends. This method has the following beneficial effects. First, the prestressed concrete box girder 100 can slide relative to the top surface of the arc-shaped twist 201. Then, when the prestressed concrete box girder 100 undergoes horizontal deformation, the prestressed concrete box girder 100 can slide freely in the horizontal direction. When the upward deflection phenomenon occurs and the rotational deformation occurs, the arc-shaped twist 201 is driven to rotate in the groove 208 under the action of friction. In this way, the assembled support device 200 can adapt to deformation in multiple directions, improve the applicable occasions, and further provide the necessary support force for the structure of the prestressed concrete box girder 100; second, when the prestressed concrete box girder 100 needs to be transported to other places, the prestressed concrete box girder 100 can be directly lifted and transported without disassembly, thereby further reducing the workload.

[0057] See also Figure 2 and Figure 3 In order to increase the lubricity between the top surface of the arc-shaped strand 201 and the bottom surface of the prestressed concrete box girder 100, as a preferred solution, a second PTFE plate 217 is fixed to the upper surface of the first steel plate 202, and the upper surface of the second PTFE plate 217 is used to contact the bottom surface of the prestressed concrete box girder 100.

[0058] See also Figure 7 and Figure 8 As one of the implementation methods for detachably connecting the base 207 to the top surface of the rigid support 218, a second bolt hole 210 is provided on the bottom plate 209, and a corresponding second external screw 219 is pre-embedded in the top surface of the corresponding rigid support 218. The external screw can pass through the second bolt hole 210, and the base 207 is detachably connected to the rigid support 218 by a second bolt 220.

[0059] See also Figures 2 to 9 The manufacturing process of the prestressed concrete beam using the assembly support device disclosed in the utility model is:

[0060] (1) First, the hard supports 218 at both ends are made, that is, a formwork is set up for concrete pouring, and the second external thread screw 219 is embedded in the top surface of the hard supports 218 at both ends;

[0061] (2) Then, the welding base 207 and the arc-shaped strand 201 are prefabricated, and a first polytetrafluoroethylene plate 216 is arranged between the first arc-shaped steel plate 204 and the second arc-shaped steel plate 213;

[0062] (3) Pass the second external thread screw 219 through the second bolt hole 210 on the bottom plate 209 of the base 207 and tighten it with the second bolt 220;

[0063] (4) Install a second PTFE plate 217 on the top surface of the arc-shaped strand 201;

[0064] (5) Building a box beam prefabricated platform 103;

[0065] (6) Pouring concrete for box beams;

[0066] (7) Tensioning prestressed tendons 101 to complete the prefabrication of prestressed reinforced concrete box beams;

[0067] (8) After the prefabricated concrete box girder is stored for 6 months, it is transported to the bridge construction site for installation, and then the assembled support device 200 is recovered and used for the next prefabrication project of the prestressed reinforced concrete box girder.

[0068] The use of the assembled support device disclosed in the utility model for supporting the end of a prestressed concrete box beam has the following technical effects:

[0069] 1. The utility model discloses an assembled support device for supporting the beam end of a prestressed concrete box girder, which can solve the technical problem in the prior art that when the beam end of a prefabricated prestressed concrete box girder is subjected to deflection, the beam end support cannot make corresponding adjustment of the direction of the supporting force according to the deflection deformation of the prefabricated prestressed concrete box girder, which easily leads to compression and cracking of the beam end of the prefabricated prestressed concrete box girder; the assembled support device has a simple structure, is easy to operate, and can be recycled; the arc hinge in the assembled support device can rotate in the groove, which can well adapt to the deformation of the prestressed tendon box girder and prevent compression cracks caused by local compression of the beam end.

[0070] 2. The second PTFE plate between the top steel plate of the arc hinge and the box beam can allow the box beam to undergo slight horizontal deformation, thus preventing shrinkage deformation of the prefabricated box beam due to shrinkage creep during storage.

[0071] 3. The assembled support device of the utility model can be recycled, which significantly reduces the construction cost. It effectively prevents and controls the occurrence of cracks at the ends of precast concrete box girders, can increase the service life of prestressed concrete box girders, reduce maintenance costs, and increase the safety of bridges. The assembled support device of the utility model is safe, applicable, economical, and efficient.

[0072] It can be understood that the present invention is described by some specific embodiments / embodiments, and those skilled in the art are aware that various changes or equivalent substitutions can be made to these features and specific embodiments / embodiments without departing from the spirit and scope of the present invention. Under the guidance of the present invention, these features and specific embodiments / embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. The specific embodiments / embodiments described in the present invention are part of the specific embodiments / embodiments of the present invention, rather than all of the specific embodiments / embodiments. The components of the specific embodiments / embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the specific embodiments / embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but only represents the selected specific embodiments / embodiments of the present invention. Therefore, the present invention is not limited by the specific embodiments / embodiments disclosed herein, and all other specific embodiments / embodiments obtained by ordinary technicians in the field without creative work based on the specific embodiments / embodiments in the present invention belong to the scope of protection of the present invention.

Claims

1. An assembled support device for supporting the end of a prestressed concrete box beam, characterized in that: It includes an arc-shaped twist and a groove matched with the arc-shaped twist; the top surface of the arc-shaped twist is a horizontally extending plane, the bottom of the arc-shaped twist has a first arc surface, the groove is arranged in the base, the inner surface of the groove has a second arc surface, and the first arc surface matches the second arc surface; the base is used for detachably connecting to the top surface of the hard support, and the top surface of the arc-shaped twist is used to contact the bottom surface of the prestressed concrete box girder.

2. The assembled support device for supporting the end of a prestressed concrete box beam according to claim 1, characterized in that: The top surface of the arc-shaped twisted steel plate is a first steel plate, the first arc surface is a first arc-shaped steel plate, the first steel plate and the first arc-shaped steel plate are combined to form a first frame structure, and the first frame structure is a semicircular frame structure; the base includes a bottom plate, a first side plate and a second side plate, the second arc surface is a second arc-shaped steel plate, the bottom plate, the first side plate, the second side plate and the second arc-shaped steel plate are connected end to end to form a second frame structure, the bending radius of the first arc-shaped steel plate matches that of the second arc-shaped steel plate, and after installation is completed, the first arc-shaped steel plate is in contact with the second arc-shaped steel plate.

3. The assembled support device for supporting the end of a prestressed concrete box beam according to claim 2, characterized in that: A plurality of first vertical steel plates and a plurality of first transverse steel plates are fixed inside the first frame structure, respectively, and each of the first vertical steel plates and each of the first transverse steel plates are cross-fixed vertically to provide structural support for the interior of the first frame structure; a plurality of second vertical steel plates and a plurality of second transverse steel plates are fixed inside the second frame structure, respectively, and each of the second vertical steel plates and each of the second transverse steel plates are cross-fixed vertically to provide structural support for the interior of the second frame structure.

4. The assembled support device for supporting the end of a prestressed concrete box beam according to claim 3, characterized in that: A first polytetrafluoroethylene plate is also provided between the first curved steel plate and the second curved steel plate, and the first polytetrafluoroethylene plate is fixed to the first curved steel plate or the second curved steel plate.

5. The assembled support device for supporting the end of a prestressed concrete box beam according to claim 4, characterized in that: A first bolt hole is provided on the first steel plate, and a corresponding first external thread screw is pre-embedded in the bottom surface of the corresponding prestressed concrete box girder. The first external thread screw can pass through the first bolt hole, and the arc twist is detachably connected to the bottom surface of the prestressed concrete box girder through the first bolt.

6. The assembled support device for supporting the end of a prestressed concrete box beam according to claim 4, characterized in that: The top surface of the arc-shaped strand can be in sliding contact with the bottom surface of the prestressed concrete box beam.

7. The assembled support device for supporting the end of a prestressed concrete box beam according to claim 6, characterized in that: A second polytetrafluoroethylene plate is fixed to the upper surface of the first steel plate, and the upper surface of the second polytetrafluoroethylene plate is used to contact the bottom surface of the prestressed concrete box girder.

8. The assembled support device for supporting the end of a prestressed concrete box beam according to claim 5 or 7, characterized in that: A second bolt hole is provided on the bottom plate, and a corresponding second external screw is pre-embedded on the top surface of the corresponding rigid support. The external screw can pass through the second bolt hole, and the base is detachably connected to the rigid support through the second bolt.

9. The assembled support device for supporting the end of a prestressed concrete box beam according to claim 8, characterized in that: The hard support is a concrete block or a steel structure.

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