Movable formwork system for prefabricating fragmented assembly type box girder top plate unit

Abstract

The utility model relates to a movable formwork system for prefabricating a split assembly type box girder top plate unit. The movable formwork system comprises two formwork trolleys, two bottom formworks, an inner formwork, an inner formwork support, two outer formworks, an outer formwork support, a fixed end formwork and a movable end formwork. Two rows of jacks are arranged on the two sides of the top of each formwork trolley, the two bottom formworks are supported on the jacks on the two formwork trolleys respectively, the inner formwork is located between the two formwork trolleys, the inner formwork support is supported below the inner formwork, the two outer formworks are located on the outer sides of the two formwork trolleys respectively, and the top face of the outer formwork supporting plate is supported below the outer formworks. The fixed end molds are located at the two ends of the bottom mold plate, the outer mold plate and the inner mold plate respectively. The device is suitable for prefabricating by adopting a short line method, two sets of template systems are circularly constructed, the floor area of a beam field can be reduced, and the construction efficiency is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge construction, relates to the prefabrication construction of a segmented assembled box beam, and specifically relates to a movable template system for prefabricating a top plate unit of a segmented assembled box beam. Background Art

[0002] Concrete precast box girders are usually prefabricated as a whole in a precast yard. The amount of concrete poured each time is large, the installation and disassembly of the internal formwork is complicated, and the construction quality is difficult to control. In addition, the transportation and installation of precast beams require the use of a variety of large-scale equipment, which is very expensive.

[0003] Patent CN 115450101A proposes a piecewise assembled variable cross-section box beam structure, such as Figure 1 As shown, the box girder is divided into multiple sections, and each section is further divided into a top plate unit 100, two web plate units 200 and a bottom plate unit 300. The sections are prefabricated in units at the prefabrication yard and transported to the bridge construction site for assembly. Since each unit is small in size, easy to process, quality guaranteed, and convenient to transport, it can be installed using small equipment, and the transportation and installation costs are low. However, the bottom of the box girder top plate unit 100 is provided with two joint plates 101 that are connected to the web plate units. The box chamber top plate 102 is located between the two joint plates, and the outer sides of the two joint plates are flange plates 103. The box girder top plate unit structure is special-shaped, and a special pedestal needs to be set up during prefabrication, which increases the pedestal cost. In addition, the number of pedestals required for the simultaneous prefabrication of multiple top plate units is large, resulting in a large area occupied by the beam yard and increased land acquisition costs. Summary of the Invention

[0004] The purpose of the utility model is to solve the above problems and provide a movable formwork system for prefabricating the top plate units of the segmented assembled box beam, so as to reduce the number of prefabricated pedestals and the area occupied by the beam yard.

[0005] The technical solution of the utility model is as follows:

[0006] A movable formwork system for prefabricating a piecewise assembled box girder top plate unit, wherein the bottom of the box girder top plate unit is provided with two joint plates that are butted against the web plate unit, the box chamber top plate is located between the two joint plates, and the outer sides of the two joint plates are flange plates. The system is characterized by comprising two formwork trolleys, two bottom formworks, an inner formwork and inner formwork brackets, two outer formworks and outer formwork brackets, a fixed end formwork, and a movable end formwork.

[0007] Two rows of jacks are installed on both sides of the top of each formwork trolley. The two bottom formworks are supported on the jacks on the two formwork trolleys respectively. The size of the two bottom formworks is consistent with the bottom surface size of the joint plate at the bottom of the box beam top plate unit.

[0008] The inner formwork is located between the two formwork trolleys, and the size of the inner formwork is consistent with the size of the bottom surface of the box chamber top plate of the box beam top plate unit. The inner formwork bracket is located below the inner formwork and includes an inner formwork support plate. The top surface of the inner formwork support plate is supported on the bottom surface of the inner formwork. A plurality of telescopic inner formwork support rods are provided at the bottom of the inner formwork support plate. The upper end of each telescopic inner formwork support rod is hinged to the inner formwork support plate, and the lower end is hinged to the anchor beam fixed to the ground.

[0009] The two outer formworks are respectively located on the outside of the two formwork trolleys. The sizes of the two outer formworks are consistent with the sizes of the flange plates of the box girder top plate. An outer formwork support frame is provided at the bottom of each outer formwork. Each outer formwork support frame includes an outer formwork support plate. The top surface of the outer formwork support plate is supported on the bottom surface of the outer formwork. A plurality of telescopic outer formwork support rods are provided at the bottom of the outer formwork support plate. The upper end of each telescopic outer formwork support rod is hinged to the outer formwork support plate, and the lower end is hinged to the anchor beam fixed to the ground.

[0010] The fixed end mold is located at one end of the bottom mold, outer mold and inner mold, and a fixed end mold bracket is provided on the outside of the fixed end mold, and the bottom of the fixed end mold bracket is anchored to the ground; the movable end mold is located at the other end of the bottom mold, outer mold and inner mold, and a movable end mold bracket is provided on the outside of the movable end mold, and a roller is provided at the bottom of the movable end mold bracket.

[0011] The utility model adopts a movable template trolley and corresponding templates, which is suitable for short-line prefabrication. One production line adopts two sets of template systems for cyclic construction, which can greatly reduce the area occupied by the beam yard and ensure construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the unit division of a piecewise assembled box girder;

[0013] Figure 2 It is a schematic transverse cross-sectional view of the present utility model;

[0014] Figure 3 It is a schematic longitudinal cross-sectional view of the utility model;

[0015] Figure 4 It is a structural diagram of a template trolley;

[0016] Figure 5 This is a schematic diagram of the state in which the first roof unit is moved forward after pouring and the second roof unit is poured during the construction of the utility model;

[0017] Figure 6 This is a schematic diagram of the state when the second top plate unit is poured and ready to move forward. DETAILED DESCRIPTION

[0018] like Figure 2 、 Figure 3 、 Figure 4As shown, the utility model comprises two template trolleys 1, two bottom templates 2, an inner template 3 and an inner template bracket, two outer templates 4 and an outer template bracket, a fixed end template 5 and a movable end template 6;

[0019] Two rows of jacks 7 are provided on both sides of the top of each formwork trolley 1. The two bottom formworks 2 are supported on the jacks 7 on the two formwork trolleys respectively. The size of the two bottom formworks is consistent with the bottom surface size of the joint plate at the bottom of the box beam top plate unit.

[0020] The inner formwork 3 is located between the two formwork trolleys 1. The size of the inner formwork is consistent with the size of the bottom surface of the box chamber top plate of the box beam top plate unit. The inner formwork bracket is located below the inner formwork and includes an inner formwork support plate 8. The top surface of the inner formwork support plate 8 is supported on the bottom surface of the inner formwork 3. A plurality of telescopic inner formwork support rods 9 are provided at the bottom of the inner formwork support plate 8. The upper end of each telescopic inner formwork support rod 9 is hinged to the inner formwork support plate 3, and the lower end is hinged to the anchor beam 10 fixed to the ground.

[0021] The two outer formworks 4 are respectively located on the outside of the two formwork trolleys 1. The sizes of the two outer formworks are consistent with the sizes of the flange plates of the box girder top plate. An outer formwork support frame is provided at the bottom of each outer formwork 4. Each outer formwork support frame includes an outer formwork support plate 11. The top surface of the outer formwork support plate 11 is supported on the bottom surface of the outer formwork 4. A plurality of telescopic outer formwork support rods 12 are provided at the bottom of the outer formwork support plate 11. The upper end of each telescopic outer formwork support rod 12 is hinged to the outer formwork support plate 11, and the lower end is hinged to the anchor beam 10 fixed to the ground.

[0022] The fixed end mold 5 is located at one end of the bottom mold, the outer mold and the inner mold, and a fixed end mold bracket 13 is provided on the outside of the fixed end mold, and the bottom of the fixed end mold bracket 13 is anchored to the ground; the movable end mold 6 is located at the other end of the bottom mold, the outer mold and the inner mold, and a movable end mold bracket 14 is provided on the outside of the movable end mold, and a roller supported on the ground is provided at the bottom of the movable end mold bracket.

[0023] In the specific implementation of the present invention, both the telescopic inner mold support rod 9 and the telescopic outer mold support rod 12 can be formed as turnbuckles. The turnbuckles include a threaded sleeve with two ends connected to a screw. Rotating the threaded sleeve can simultaneously adjust the threaded connection length between the threaded sleeve and the two screws, thereby adjusting the length of the turnbuckles.

[0024] During the specific implementation of the present invention, in order to ensure that the template trolley moves along a fixed track, two sets of trolley tracks 14 can be set on the ground. The running wheels at the bottom of the two template trolleys 1 are respectively supported on the two sets of trolley tracks and move along the trolley tracks 15.

[0025] The construction method of this utility model is as follows:

[0026] like Figure 2 、 Figure 3As shown, the spacing between the two formwork trolleys 1 is set according to the spacing between the two web joint plates at the bottom of the box girder top plate unit, the trolley track 15 is laid in advance on the hardened ground of the prefabrication yard, the anchor beam 10 hinged to the telescopic inner mold support rod and the telescopic outer mold support rod and the anchoring piece at the bottom of the anchor fixed end mold bracket are set, the two formwork trolleys 1 are placed on the two sets of trolley tracks 15, the inner mold support frame is installed between the two formwork trolleys, the outer mold support frame is installed on the outside of the two formwork trolleys, the bottom formwork 2 is set on the formwork trolley, and the inner formwork 3 and the outer formwork are set on the inner and outer formwork brackets respectively. 4. Use the jack 7 on the formwork trolley to adjust the height of the bottom formwork, adjust the length of the telescopic inner formwork support 9 and the telescopic outer formwork support rod 12, and adjust the inclination angles of the bottom formwork 2, inner formwork 3, and outer formwork 4 to adapt to the designed transverse slope of the box girder top plate unit. Install fixed end formwork 5 and movable end formwork 6 at both ends of the bottom formwork and the inner and outer formworks, respectively, and anchor the bottom of the fixed end formwork bracket to the bottom surface anchor. To prevent the outer formwork from expanding, two rows of outer brackets 15 can be installed on the outside of the two outer formworks 4 to tighten the outer side of the outer formwork. Pour the concrete of the first box girder top plate unit 100.

[0027] like Figure 5 As shown, after the concrete reaches the demoulding strength, the outer brackets on the outer formwork are loosened, the movable end formwork is removed, the inner and outer formwork brackets shrink and separate from the inner and outer formworks, and the formwork trolley carrying the first box girder top plate unit 100 moves forward by the distance of one top plate unit; the other two formwork trolleys 1 are hoisted between the first top plate unit 100 and the fixed end formwork 5, the second set of bottom formwork 2 and inner and outer formworks are installed, and the rear end of the first top plate unit 100 is used as the movable end formwork of the second top plate unit to match the connection surface between the front and rear top plate unit ends, and the second top plate unit is poured;

[0028] like Figure 6 As shown, after the second top plate unit 100 reaches the demoulding strength, the template trolley 1 of the first top plate unit is moved forward a certain distance, and the first top plate unit 100 is lifted off the template trolley 1; the template trolley of the second top plate unit is moved forward the distance of one top plate unit, and then the template trolley and the top formwork, inner and outer formwork of the previous top plate unit are lifted back between the fixed end formwork 5 and the second top plate unit, and the third top plate unit is cast, and the construction is repeated in this way.

Claims

1. A movable formwork system for prefabricating a piecewise assembled box girder top plate unit, wherein the bottom of the box girder top plate unit is provided with two joint plates that are butted against the web plate unit, the box chamber top plate is located between the two joint plates, and the outer sides of the two joint plates are flange plates, characterized in that: It includes two template trolleys, two bottom templates, an inner template and inner template bracket, two outer templates and outer template brackets, a fixed end template and a movable end template; Two rows of jacks are installed on both sides of the top of each formwork trolley. The two bottom formworks are supported on the jacks on the two formwork trolleys respectively. The size of the two bottom formworks is consistent with the bottom surface size of the joint plate at the bottom of the box beam top plate unit. The inner formwork is located between the two formwork trolleys, and the size of the inner formwork is consistent with the size of the bottom surface of the box chamber top plate of the box beam top plate unit. The inner formwork bracket is located below the inner formwork and includes an inner formwork support plate. The top surface of the inner formwork support plate is supported on the bottom surface of the inner formwork. A plurality of telescopic inner formwork support rods are provided at the bottom of the inner formwork support plate. The upper end of each telescopic inner formwork support rod is hinged to the inner formwork support plate, and the lower end is hinged to the anchor beam fixed to the ground. The two outer formworks are respectively located on the outside of the two formwork trolleys. The sizes of the two outer formworks are consistent with the sizes of the flange plates of the box girder top plate. An outer formwork support frame is provided at the bottom of each outer formwork. Each outer formwork support frame includes an outer formwork support plate. The top surface of the outer formwork support plate is supported on the bottom surface of the outer formwork. A plurality of telescopic outer formwork support rods are provided at the bottom of the outer formwork support plate. The upper end of each telescopic outer formwork support rod is hinged to the outer formwork support plate, and the lower end is hinged to the anchor beam fixed to the ground. The fixed end mold is located at one end of the bottom mold, outer mold and inner mold, and a fixed end mold bracket is provided on the outside of the fixed end mold, and the bottom of the fixed end mold bracket is anchored to the ground; the movable end mold is located at the other end of the bottom mold, outer mold and inner mold, and a movable end mold bracket is provided on the outside of the movable end mold, and a roller is provided at the bottom of the movable end mold bracket.

2. The movable formwork system for prefabricating the top plate units of the segmented assembled box beams according to claim 1 is characterized in that: The telescopic inner mold support rod and the telescopic outer mold support rod both adopt turnbuckle screws.

3. The movable formwork system for prefabricating the top plate units of the segmented assembled box beams according to claim 1 is characterized in that: Two sets of trolley tracks are provided on the ground, and the running wheels of the two template trolleys are respectively supported on the two sets of trolley tracks and run along the trolley tracks.

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