Detachable inner mold supporting device for cast-in-place box girder

Abstract

The utility model provides a detachable inner mold supporting device for a cast-in-place box girder, which belongs to the technical field of cast-in-place box girder construction, and comprises an anchoring structure, a steel plate, three first screws welded at the top of the steel plate, threaded sleeves arranged at the tops of the first screws, and a plurality of second screws welded at the bottom of the steel plate, the top of the threaded sleeve is flush with the surface of the concrete layer; the folding supporting frame comprises three supporting rods, folding connecting devices are arranged among the supporting rods, movable connecting bases are movably arranged at the bottoms of the supporting rods and are in threaded connection with the threaded sleeves, supporting plates are arranged at the tops of the supporting rods, and the tops of the supporting plates abut against the top wall of the box girder inner mold. The problems that an existing box girder internal formwork support directly stands on a box girder bottom plate, after concrete pouring is completed, cutting operation is complex, time and labor are consumed, bottom plate concrete is prone to being damaged, and the overall quality and structural safety of a box girder are affected are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of cast-in-place box girder construction, in particular to a detachable inner mold supporting device for a cast-in-place box girder. Background Art

[0002] In the construction of modern bridges and building structures, box girders are widely used due to their unique structural advantages. Due to the limited construction environment within the city, many elevated bridges do not have enough space for prefabrication of box girders, so cast-in-place construction methods are usually adopted. Traditional box girder inner formwork supports are usually directly placed on the bottom plate of the box girder and need to be removed after the concrete pouring is completed. This process is not only complicated, time-consuming and labor-intensive, but also easily damages the bottom plate concrete, affecting the overall quality and structural safety of the box girder. Utility Model Content

[0003] In order to make up for the above shortcomings, the utility model provides a detachable inner mold supporting device for a cast-in-place box girder, which is used to solve the above problems.

[0004] The utility model is achieved in this way:

[0005] A detachable inner formwork support device for a cast-in-place box beam, comprising:

[0006] The anchoring structure comprises a steel plate, wherein the steel plate is pre-buried in a concrete layer, three first screws are welded to the top of the steel plate, a threaded sleeve is arranged at the top of the first screw, and the top of the threaded sleeve is flush with the surface of the concrete layer;

[0007] A folding support frame includes three support rods, wherein a folding connection device is arranged between the support rods, a movable connection seat is movably arranged at the bottom of the support rod, the movable connection seat is threadedly connected to the threaded sleeve, and a support plate is arranged on the top of the support rod, and the top of the support plate abuts against the top wall of the inner mold of the box beam.

[0008] In an embodiment of the utility model, the folding connection device includes a connecting member, three connecting rods are hinged on the outer side of the connecting member, and the other end of the connecting rod is hinged with a hinge support, and any of the hinge supports is fixedly connected to one side of one of the support rods.

[0009] In an embodiment of the utility model, there are two folding connection devices, which are arranged between three support rods along the length direction of the support rods.

[0010] In an embodiment of the utility model, a first docking hole is provided at the bottom axis of the support rod, and a plurality of limiting side grooves are provided on the inner side wall of the first docking hole.

[0011] In an embodiment of the utility model, the movable connecting seat includes a connecting plate, a connecting shaft is arranged at the top axis of the connecting plate, the surface of the connecting shaft is provided with first limiting plates of the same number as the limiting side grooves, the connecting shaft is movably arranged in the first docking hole, the first limiting plate is engaged with the limiting side groove, a second screw is arranged at the bottom axis of the connecting plate, and the second screw is threadedly connected to the threaded sleeve.

[0012] In an embodiment of the utility model, a double nut is provided on the second screw rod.

[0013] In an embodiment of the utility model, a second docking hole is provided at the top axis of the support rod, a flange is provided on the inner wall of the second docking hole close to the top side, a convex ring coaxial with the second docking hole is provided on the top of the support rod, and two guide grooves are symmetrically provided on both sides of the top of the support rod with the second docking hole as the center.

[0014] In an embodiment of the utility model, a guide column is provided at the bottom axis of the support plate, and the guide column is movably arranged in the second docking hole. A second limiting plate is provided at the bottom of the guide column. When the support plate moves upward, the top of the second limiting plate contacts the flange. A spring is provided on the outer side of the guide column, and the top of the spring contacts the support plate, and the bottom of the spring contacts the inner bottom of the convex ring. Two guide rods are provided at the bottom of the support plate with the guide column as the center, and the guide rods are engaged with the guide grooves.

[0015] The beneficial effects of the utility model are as follows: an anchoring structure pre-buried in the concrete layer is adopted, and the top of the threaded sleeve is flush with the surface of the concrete layer, which effectively reduces the damage to the bottom plate concrete surface during installation and removal. After removal, the threaded sleeve can be filled with cement mortar to further protect the concrete layer and improve the overall quality and structural safety of the box girder; when disassembling, there is no need to cut the support rod, but only to release the connection between the folding support frame and the anchoring structure, which simplifies the disassembly process and reduces the workload and time consumption; the folding support frame adopts the design of three support rods and a folding connecting device, and the three support rods are constrained together by two folding connecting devices. Compared with the installation of a single support rod, this method has better stability; a double nut is provided on the second screw rod, and the starting height of the support rod can be set by adjusting the position of the double nut, which solves the problem of deviation in the size of the pre-buried anchoring structure and the inclination caused by concrete pouring, and ensures that the support rod and the top wall of the beam box inner mold can be fully fitted. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A structural schematic diagram of the construction of the inner mold support device provided in the embodiment of the utility model;

[0018] Figure 2 A schematic diagram of the structure of the inner mold support device provided in an embodiment of the utility model;

[0019] Figure 3 A schematic cross-sectional view of the movable connection seat provided in an embodiment of the utility model;

[0020] Figure 4 A schematic diagram of the structure of a folding connection device provided in an embodiment of the utility model;

[0021] Figure 5 A schematic cross-sectional structure diagram of a support plate provided in an embodiment of the utility model.

[0022] In the figure: 10, anchoring structure; 11, steel plate; 12, first screw rod; 13, threaded sleeve; 20, folding support frame; 21, support rod; 2101, first docking hole; 21011, limiting side groove; 2102, guide groove; 2103, second docking hole; 21031, flange; 2104, convex ring; 22, movable connecting seat; 2201, connecting plate; 2202, connecting shaft; 2203, first limiting piece; 2204, second screw rod; 2205, double nut; 23, folding connecting device; 2301, connecting piece; 2302, hinge support; 2303, connecting rod; 24, support plate; 2401, guide column; 24011, second limiting piece; 2402, spring; 2403, guide rod; 30, box girder inner mold; 40, box girder outer mold; 50, concrete layer. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, the utility model provides a detachable inner form support device for a cast-in-place box girder, comprising an anchoring structure 10 pre-buried in a concrete layer 50 and a folding support frame 20 that is expected to be detachably connected. When the box girder is cast in place, a box girder outer formwork 40 is firstly erected on both sides, and a box girder inner formwork 30 is erected between the box girder outer formworks 40. The bottom between the two box girder outer formworks 40 is a concrete layer 50, that is, a steel mesh is bundled here, and the anchoring structure 10 is fixed here. After the concrete is poured, the folding support frame 20 is unfolded and threadedly connected to the anchoring structure 10, and its top contacts the top wall of the box girder inner formwork 30 to form a support. After the formwork is completed, it can be directly dismantled, which effectively avoids the damage to the concrete layer 50 caused by the dismantling of the traditional support method. At the same time, the folding support frame 20 is more stable than the single-rod support method, and its unfolding method is simple, easy to install and disassemble, thereby improving the construction quality and efficiency.

[0026] In this embodiment, the anchoring structure 10 includes a steel plate 11, which is embedded in the concrete layer 50. Three first screws 12 are welded to the top of the steel plate 11, and a threaded sleeve 13 is welded to the top of the first screw 12. The top of the threaded sleeve 13 is flush with the surface of the concrete layer 50, thereby reducing damage to the concrete surface of the base plate during installation and removal of the inner mold support device. After the folding support frame 20 is removed, the sleeve is filled with mortar to improve the appearance quality of the concrete.

[0027] like Figure 2-5 As shown, the folding support frame 20 includes three support rods 21, and a folding connection device 23 is arranged between the support rods 21. A movable connection seat 22 is movably arranged at the bottom of the support rod 21, and the movable connection seat 22 is threadedly connected to the threaded sleeve 13. A support plate 24 is arranged on the top of the support rod 21, and the top of the support plate 24 is in contact with the top wall of the box beam inner mold 30.

[0028] Among them, the folding connection device 23 includes a connecting piece 2301, three connecting rods 2303 are hinged on the outer side of the connecting piece 2301, and a hinge support 2302 is hinged on the other end of the connecting rod 2303. A threaded hole is provided on one side of the support rod 21. Any hinge support 2302 is respectively connected to one side of a support rod 21 by bolts, and there are two folding connection devices 23, which are arranged between the three support rods 21 along the length direction of the support rod 21. The three support rods 21 are constrained together by two folding connection devices 23. Compared with the installation of a single support rod 21, this method is more convenient to disassemble and assemble. After unfolding and connecting with three threaded sleeves 13, its stability is also more stable than three independent support rods 21, and it is also convenient for transportation after disassembly and folding.

[0029] In this embodiment, a first docking hole 2101 is formed at the bottom axis of the support rod 21 , and a plurality of limiting side grooves 21011 are formed on the inner side wall of the first docking hole 2101 .

[0030] Furthermore, the movable connecting seat 22 includes a connecting plate 2201, a connecting shaft 2202 is arranged at the top axis of the connecting plate 2201, the surface of the connecting shaft 2202 is provided with the same number of first limiting plates 2203 as the limiting side grooves 21011, the connecting shaft 2202 is movably arranged in the first docking hole 2101, the first limiting plates 2203 are engaged with the limiting side grooves 21011, and a second screw 2204 is arranged at the bottom axis of the connecting plate 2201, the second screw 2204 is threadedly connected with the threaded sleeve 13, after unfolding the folding support frame 20, the second screw 2204 is coaxially arranged with the threaded sleeve 13, and the second screw 2204 can be screwed together with the threaded sleeve 13 by rotating the movable connecting seat 22.

[0031] As a preferred embodiment, a double nut 2205 is provided on the second screw rod 2204. The starting height of the support rod 21 can be set by adjusting the position of the double nut 2205, which is used to solve the problem that the support rod 21 cannot fully fit with the top wall of the box beam inner mold 30 due to the deviation in the size of the embedded anchoring structure 10 and the inclination caused by concrete pouring, resulting in inconsistent horizontality of the top surface of the threaded sleeve 13.

[0032] In this embodiment, a second docking hole 2103 is provided at the top axis of the support rod 21, a flange 21031 is provided on the inner wall of the second docking hole 2103 close to the top side, a convex ring 2104 coaxial with the second docking hole 2103 is provided on the top of the support rod 21, and two guide grooves 2102 are symmetrically provided on both sides of the top of the support rod 21 with the second docking hole 2103 as the center.

[0033] Furthermore, a guide column 2401 is provided at the bottom axis of the support plate 24, and the guide column 2401 is movably arranged in the second docking hole 2103. A second limiting piece 24011 is provided at the bottom of the guide column 2401. When the support plate 24 moves upward, the top of the second limiting piece 24011 abuts against the flange 21031, and a spring 2402 is provided on the outside of the guide column 2401. The top of the spring 2402 abuts against the support plate 24, and the bottom of the spring 2402 abuts against the inner bottom of the convex ring 2104. Two guide rods 2403 are arranged at the bottom of the support plate 24 with the guide column 2401 as the center, and the guide rods 2403 are engaged with the guide grooves 2102. When the box girder inner mold 30 is suspended between the box girder outer molds 40 by the gantry crane, in order to avoid too fast contact with the support rod 21, which may cause strong collision between the components on the support rod 21 and cause deformation of the connecting structure, a flexible connection is provided by the spring 2402. At the same time, the guide rods 2403 on both sides strengthen the stability of the longitudinal guidance of the guide column 2401.

[0034] Specifically, the working principle of the detachable inner mold support device for cast-in-place box beam is as follows: the anchor structure 10 is embedded in the concrete layer 50, and the top surface of the threaded sleeve 13 is made flush with the concrete surface. Then, the folding support frame 20 is unfolded outward, and the second screw rod 2204 is made coaxial with the threaded sleeve 13. The movable connecting seat 22 is rotated to fix it in the threaded sleeve 13, and the inside of the box beam is suspended above the inner mold support assembly so that it passes through the bottom of the box beam inner mold 30 and contacts with its top wall. At this time, downward pressure is generated on the support plate 24, and the support plate 24 exerts pressure on the spring 240. 2 generates extrusion to reduce the impact of pressure on the inner mold support device. Finally, the support plate 24 conflicts with the convex ring 2104. When it needs to be removed, the box beam outer mold 40, the box beam inner mold 30 and the movable connecting seat 22 are removed in sequence, and then the threaded sleeve 13 is filled with cement mortar, and then the folding support frame 20 is folded. The above structure solves the problem that the existing box beam inner mold 30 bracket is directly placed on the box beam bottom plate, and the removal operation after the concrete pouring is completed is complicated, time-consuming and labor-intensive, and easily causes damage to the bottom plate concrete, affecting the overall quality and structural safety of the box beam.

[0035] The utility model is further described above with the help of specific embodiments, but it should be understood that the specific description here should not be construed as limiting the essence and scope of the utility model. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the utility model.

Claims

1. A detachable inner mold support device for a cast-in-place box beam, characterized in that: include: An anchoring structure (10) comprises a steel plate (11), wherein the steel plate (11) is pre-buried in a concrete layer (50), three first screws (12) are welded to the top of the steel plate (11), a threaded sleeve (13) is provided at the top of the first screw (12), and the top of the threaded sleeve (13) is flush with the surface of the concrete layer (50); A folding support frame (20) comprises three support rods (21), wherein a folding connection device (23) is arranged between the support rods (21), a movable connection seat (22) is movably arranged at the bottom of the support rod (21), the movable connection seat (22) is threadedly connected to the threaded sleeve (13), and a support plate (24) is arranged at the top of the support rod (21), and the top of the support plate (24) is in contact with the top wall of the box beam inner mold (30).

2. The detachable inner mold support device for cast-in-place box beam according to claim 1 is characterized in that: The folding connection device (23) comprises a connecting member (2301), three connecting rods (2303) are hinged on the outer side of the connecting member (2301), and the other end of the connecting rod (2303) is hinged with a hinge support (2302), and any of the hinge supports (2302) is fixedly connected to one side of one of the support rods (21).

3. The detachable inner mold support device for cast-in-place box beam according to claim 2 is characterized in that: There are two folding connection devices (23), which are arranged between the three support rods (21) along the length direction of the support rods (21).

4. The detachable inner mold support device for cast-in-place box beam according to claim 1 is characterized in that: A first docking hole (2101) is provided at the bottom axis of the support rod (21), and a plurality of limiting side grooves (21011) are provided on the inner side wall of the first docking hole (2101).

5. The detachable inner mold support device for cast-in-place box beam according to claim 4 is characterized in that: The movable connecting seat (22) comprises a connecting plate (2201), a connecting shaft (2202) is arranged at the top axis of the connecting plate (2201), the surface of the connecting shaft (2202) is provided with the same number of first limiting plates (2203) as the limiting side grooves (21011), the connecting shaft (2202) is movably arranged in the first docking hole (2101), the first limiting plates (2203) are meshed with the limiting side grooves (21011), and a second screw rod (2204) is arranged at the bottom axis of the connecting plate (2201), and the second screw rod (2204) is threadedly connected to the threaded sleeve (13).

6. The detachable inner formwork support device for cast-in-place box beam according to claim 5, characterized in that: The second screw rod (2204) is provided with a double nut (2205).

7. The detachable inner formwork support device for cast-in-place box beam according to claim 1, characterized in that: A second docking hole (2103) is provided at the axis center of the top of the support rod (21); a flange (21031) is provided on the inner wall of the second docking hole (2103) close to the top side; a convex ring (2104) coaxial with the second docking hole (2103) is provided at the top of the support rod (21); and two guide grooves (2102) are symmetrically provided on both sides of the top of the support rod (21) with the second docking hole (2103) as the center.

8. The detachable inner formwork support device for cast-in-place box beam according to claim 7, characterized in that: A guide column (2401) is arranged at the bottom axis of the support plate (24), and the guide column (2401) is movably arranged in the second docking hole (2103). A second limiting plate (24011) is arranged at the bottom of the guide column (2401). When the support plate (24) moves upward, the top of the second limiting plate (24011) contacts the flange (21031). A spring (2402) is arranged on the outer side of the guide column (2401). The top of the spring (2402 contacts the support plate (24), and the bottom of the spring contacts the inner bottom of the convex ring (2104). Two guide rods (2403) are arranged at the bottom of the support plate (24) with the guide column (2401) as the center, and the guide rods (2403) are engaged with the guide groove (2102).

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