Box girder formwork construction method for municipal road and bridge building

Abstract

The invention relates to the technical field of formwork construction, in particular to a construction method of a box girder formwork for municipal road and bridge building, which comprises a bottom formwork with a groove structure, side formworks composed of wing plates, eave plates and side plates, end formworks, core formworks, sealing structures, movable frames, trundles and cross beams. The bottom die, the side dies and the end dies are all steel die plates, the two sets of end plates are installed at the two ends of the bottom die and the two ends of the side dies respectively, two cross beams are arranged between the two end dies in a bilateral symmetry mode and abut against the outer surfaces of wall plates of the side plates and the bottom die, two supports are fixedly welded to one sides of the cross beams, and 30-degree included angles are formed between the supports and the cross beams. The end part of the bracket is fixedly connected with a fastener with a U-shaped structure; according to the invention, the integral template system of the box girder can be assembled in a combined manner through the cross beam combination bracket and the fastener arranged among the bottom die, the side die and the end die, and compared with the original integral welding type template of the box girder, the template can be easily disassembled after the pouring of the box girder is completed, and is convenient to reuse.

Description

Technical Field

[0001] The invention relates to the technical field of template construction, and in particular to a box beam template construction method for municipal road and bridge construction. Background Art

[0002] Cast-in-place continuous box girder is a type of beam in bridge engineering. It is hollow inside and has flanges on both sides of the upper part, similar to a box, hence the name. It is divided into single-box and multiple-box types. The box girder is large in volume, and the casting must be carried out on a stable production platform. First, the template is designed and made according to the shape of the box girder, and then the templates are assembled together to enclose a casting bin for block or integrated casting.

[0003] The formwork installation and construction of the box girder also need to implement the corresponding construction standards. Because the single pouring volume of box girder concrete is large, the impact and pressure of concrete on the formwork are also very large. It is necessary to ensure that the formwork has sufficient rigidity and stability to prevent the formwork from running and expanding. Therefore, the current box girder formwork installation and construction generally uses steel plates welded into corresponding casting bins according to the shape of the box girder. However, this construction method makes it difficult to disassemble the entire mold, and the mold is heavy and difficult to move. When pouring the box girder at the construction site, it is not convenient to move it and pour it near the installation position of the box girder.

[0004] Therefore, in order to address the problem that the above-mentioned existing box girder formwork installation and construction method adopts the overall welding forming method which is inconvenient to dismantle and difficult to move, and is not conducive to the nearby casting and installation of the box girder, an assembled box girder formwork installation and construction method can be designed to ensure its formwork strength and rigidity and facilitate its mobile use. Summary of the invention

[0005] In order to overcome the problems that the existing box girder formwork installation construction method adopts the overall welding forming method which is inconvenient to dismantle and difficult to move, and is not conducive to the nearby casting and installation of the box girder.

[0006] The technical scheme of the present invention is: a method for constructing a box beam formwork for municipal road and bridge construction, comprising a bottom formwork with a trough structure, a side formwork composed of a wing plate, an eave plate, and a side plate, an end formwork and a core formwork, a sealing structure, a movable frame, casters and a crossbeam; the bottom formwork, the side formwork and the end formwork are all steel formworks, the bottom plate of the bottom formwork is stably placed on a box beam production platform, the wall plate height of the bottom formwork is 30-50cm higher than the bottom surface height of the box beam, and is 20-30cm lower than the bottom surface of the box beam flange, two side forms are respectively placed on the upper ends of the wall plates of the bottom formwork and the side plates are made to abut against each other, a sealing structure is arranged between the side plates and the wall plates, the end plates have two groups and are respectively arranged at the two ends of the bottom formwork and the side forms, and the end plates and the wall plates of the bottom formwork are connected by It is connected and fixed with bolt anchors, and the left and right ends of the end molds are rotatably connected with movable frames. The lower end of the movable frame is equipped with casters that move along the surface of the box girder manufacturing platform. Two cross beams are symmetrically arranged between the two end molds and the cross beams are against the outer surfaces of the side panels and the wall panels of the bottom mold. Two brackets are welded and fixed on one side of the cross beam, and there is an angle of 30 degrees between the brackets and the cross beam. The ends of the brackets are fixedly connected with fasteners of U-shaped structures. The fasteners on the same cross beam are respectively clamped on the corresponding edges of the end molds and connected and fixed by bolt anchors. The cross beam and the adjacent side panels are connected and fixed by bolt anchors. The bottom mold, side mold and end mold enclose a casting bin of the box girder, and a core mold fixed by the box girder steel bars is arranged in the casting bin.

[0007] Preferably, the bottom form is placed stably on the box beam manufacturing platform, and then the end form is placed on both ends of the bottom form. The end form and the bottom form are first connected and fixed by bolt fasteners, and then the side form is placed on the bottom form and installed. The side form on one side is installed first, and then the crossbeam on this side is installed together. The crossbeam is fixed between the two end plates by fasteners, and the side plate and the crossbeam are also fixed by bolt fasteners. Then the side form and crossbeam on the other side are installed in the above manner. When the two beams are fixed, the sealing structure between the bottom form wall plate and the side plate is first adjusted to reduce the structural gap of the assembly. The overall formwork system of the box beam can be assembled in a modular manner by combining the crossbeams and brackets and fasteners arranged between the bottom form, the side form and the end form. Compared with the original overall welded formwork of the box beam, it can be easily disassembled after the box beam is cast, which is convenient for reuse.

[0008] Preferably, the end mold is a rectangular steel plate and its length is greater than the spacing between the side molds. A through-hole for the core mold and an inlet and outlet of the prestressed tendon pipe in the box beam are pre-set on the end mold. When the box beam is cast, the through-hole for the core mold and the inlet and outlet of the prestressed tendon pipe are sealed. As a rectangular steel plate, the end mold is easy to process. The surface of the end mold is pre-opened with the through-hole for the core mold and the inlet and outlet of the prestressed tendon pipe according to the structural design of the box beam. During installation, a measuring tool is used to ensure that the through-hole for the core mold and the inlet and outlet of the prestressed tendon pipe are in the correct position.

[0009] Preferably, two left-right symmetrical angle plates are welded and fixed on one side of the end plate. The part of the angle plate perpendicular to the end mold is in close contact with the wall panel of the bottom mold and is fixed by screwing bolts into corresponding thread holes on the angle plate and the wall panel. When installing the end plate, align the angle plates on both sides with the wall panels on both sides of the bottom mold respectively, make the vertical part of the angle plate in close contact with the wall panel, and then insert the bolts into the vertical part of the angle plate and the corresponding thread holes on the wall panel to connect and lock them.

[0010] Preferably, the end plate is fixedly connected with a rotating shaft symmetrically on the left and right sides, and one end of the movable frame is fixedly connected with a turntable tightly attached to the surface of the end mold. The turntable is rotatably connected to the rotating shaft and the movable frame is rotated with the rotating shaft as the axis, driving the casters to rise and fall. The movable frame rotates up and down with the rotating shaft as the axis. When the mold is in use, the movable frame is flipped upward to make the casters leave the production platform. When the mold needs to be moved, first use a crane to slightly lift the mold off the production platform, and then rotate the movable frame downward to make the casters fall below the bottom mold, put down the mold, and the casters fall on the production platform, push the mold, and move the mold to a suitable position for use by rolling the casters.

[0011] Preferably, two pin holes are provided on one side of the end mold near the rotating shaft, and both pin holes fall on a circular path with the rotating shaft as the axis. A pin rod is inserted into the edge of the turntable and the pin rod is inserted into the corresponding pin hole to lock the turntable and the end mold, keeping the casters lifted or falling on the box beam manufacturing platform. When the movable frame rotates, the turntable rotates accordingly and the hole on the turntable is aligned with one of the two pin holes. After the pin rod is inserted into the pin hole and the hole on the turntable, the turntable and the end mold are locked, making the movable frame unable to move. The pin rod is made of high-strength steel, has good compression and bending resistance, and can withstand the weight load of the mold.

[0012] Preferably, the sealing structure is a notch, and a notch with a depth of 0.5 cm is provided at the lower edge of the outer wall of the side panel and the upper edge of the outer wall of the wall panel of the bottom mold. A matching rubber strip is embedded in the notch, and the crossbeam is against the side panel and the wall panel of the bottom mold to press the rubber strip in the notch, so that the rubber strip seals the structural gap between the wall panel and the side panel of the bottom mold. Before the crossbeam is installed, the side mold and the bottom mold on one side are assembled, the notches are aligned with each other, and then the rubber strip is inserted into the notch, and the rubber strip is welded to the inner wall of the notch by hot melting. The structural gap between the side panel and the wall panel of the bottom mold is sealed with the help of the rubber strip, and then the crossbeam and the side panel are assembled so that the crossbeam is close to the side panel and the wall panel, covering the rubber strip to prevent the rubber strip from being exposed to the outside and being damaged by aging.

[0013] Preferably, the sealing structure is a support plate with a thickness of 0.5-1cm. The support plate is integrally formed at the upper edge of the wall panel and the lower edge of the side panel of the bottom mold. The support plate and the wall panel, as well as the side panel, are all vertical. Rubber strips are embedded on the surface of the support plate, and the upper and lower adjacent support plates are tightly attached to each other. Before the installation of the crossbeam, the side mold and the bottom mold on one side are assembled, and the support plates are aligned with each other so that the rubber strips fit each other. The support plate can be heated to melt the two rubber strips together, or welding can be avoided. Then the crossbeam and the side panel are assembled so that the crossbeam is tightly attached to the side panel and the wall panel.

[0014] Preferably, a through hole with a width of two pallets' thickness is opened in the middle of the crossbeam, and the pallets that are closely attached to each other are inserted into the through hole and the rubber strips are squeezed to seal the gaps between the pallets. When the crossbeam is assembled, the through hole is aligned with the pallets that are abutting against each other, and the pallets are passed through the through hole. The inner wall of the through hole is used to limit the two pallets and ensure that the rubber strips are closely attached to seal the structural gaps.

[0015] Beneficial effects of the present invention:

[0016] 1. The overall formwork system of the box beam can be assembled by combining the crossbeams, brackets and fasteners set between the bottom form, side form and end form. Compared with the original integral welded formwork of the box beam, it can be easily disassembled after the box beam is poured, which is convenient for reuse;

[0017] 2. Through the rotatable movable frame set on the end plate and the casters, the template can be hoisted after the box beam is poured. After opening the movable frame, the mold can be moved by rolling on the production platform through the casters, and pouring can be carried out at the nearest location where the box beam is installed. It is flexible and convenient to use;

[0018] 3. The sealing structure set between the bottom mold wall plate and the side plate is used in conjunction with the crossbeam support to further improve the sealing of the connection between the bottom mold and the side mold to avoid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a three-dimensional structural schematic diagram of a construction method of a box beam template for municipal road and bridge construction of the present invention;

[0020] Figure 2 Shown is a front structural schematic diagram of a method for constructing a box beam formwork for municipal road and bridge construction according to the present invention;

[0021] Figure 3 Shown is a schematic diagram of the three-dimensional structure of the end formwork of the municipal road and bridge construction box girder formwork construction method of the present invention;

[0022] Figure 4 Shown is a schematic diagram of the three-dimensional structure of a movable frame of a method for constructing a box beam formwork for municipal road and bridge construction according to the present invention;

[0023] Figure 5 Shown is a partially enlarged three-dimensional structural schematic diagram of the construction method of the box beam template for municipal road and bridge construction of the present invention at A;

[0024] Figure 6 Shown is a side first structural schematic diagram of the method for constructing a box beam template for municipal road and bridge construction of the present invention;

[0025] Figure 7 Shown is a first three-dimensional structural schematic diagram of the bottom mold and the side mold of the box girder template construction method for municipal road and bridge construction of the present invention;

[0026] Figure 8 Shown is a schematic diagram of the first three-dimensional structure of the cross beam of the municipal road and bridge construction box beam template construction method of the present invention;

[0027] Fig. 9 Shown is a second structural schematic diagram of the side of the method for constructing a box beam template for municipal road and bridge construction of the present invention;

[0028] Fig.10 Shown is a second three-dimensional structural schematic diagram of the bottom mold and the side mold of the box girder template construction method for municipal road and bridge construction of the present invention;

[0029] Fig.11 Shown is a schematic diagram of the second three-dimensional structure of the cross beam of the box beam formwork construction method for municipal road and bridge construction of the present invention.

[0030] Explanation of the reference numerals: 1. bottom mold; 2. wing plate; 3. eaves plate; 4. side plate; 6. end mold; 7. movable frame; 8. caster; 9. crossbeam; 10. bracket; 11. fastener; 12. core mold; 13. angle plate; 14. rotating shaft; 15. turntable; 16. pin hole; 17. pin rod; 18. through opening; 501. recess; 502. support plate. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] See also Figure 1-Figure 11The present invention provides a method for constructing a box beam template for municipal road and bridge construction, comprising a bottom mold 1 with a trough structure, a side mold consisting of a wing plate 2, an eave plate 3, and a side plate 4, an end mold 6 and a core mold 12, a sealing structure, a movable frame 7, a caster 8, and a cross beam 9; the bottom mold 1, the side mold and the end mold 6 are all steel molds, the bottom plate of the bottom mold 1 is stably placed on a box beam production platform, the wall plate height of the bottom mold 1 is 30-50 cm higher than the bottom surface height of the box beam, and is 20-30 cm lower than the bottom surface of the box beam flange, two side molds are respectively placed on the upper ends of the wall plates of the bottom mold 1 and the side plates 4 are made to abut against each other with the wall plates of the bottom mold 1, and the side plates 4 and A sealing structure is provided between the wall panels, the end panels have two groups and are respectively installed at the two ends of the bottom mold 1 and the side mold, the end panels and the wall panels of the bottom mold 1 are connected and fixed by bolt anchors, the left and right ends of the end mold 6 are rotatably connected with movable frames 7, the lower end of the movable frame 7 is equipped with casters 8 that move along the surface of the box beam manufacturing platform, two cross beams 9 are symmetrically provided between the two end molds 6, and the cross beams 9 are against the outer surface of the wall panels of the side panels 4 and the bottom mold 1, one side of the cross beam 9 is welded and fixed with two brackets 10, there is an angle of 30 degrees between the bracket 10 and the cross beam 9, and the end of the bracket 10 is fixedly connected with a buckle of a U-shaped structure The fasteners 11 on the same crossbeam 9 are respectively clamped on the edges of the corresponding end molds 6 and connected and fixed by bolt anchors. The crossbeam 9 and the adjacent side panels 4 are connected and fixed by bolt anchors. The bottom mold 1, the side mold and the end mold 6 are surrounded by a casting bin of the box beam, and a core mold 12 fixed by the box beam steel bars is arranged in the casting bin. The bottom mold 1 is placed stably on the box beam manufacturing platform, and then the end mold 6 is placed on both ends of the bottom mold 1. The end mold 6 and the bottom mold 1 are first connected and fixed by bolt fasteners, and then the side mold is placed on the bottom mold 1 and installed. The side mold on one side is installed first, and then the crossbeam 9 on that side is installed together. During installation, the crossbeam 9 is fixed between the two end plates by means of the fasteners 11, and the side plates 4 and the crossbeam 9 are also fixed by means of bolt fasteners, and then the side form and the crossbeam 9 on the other side are installed in the above manner. When the two crossbeams 9 are fixed, the sealing structure between the bottom form 1 wall plate and the side plate 4 is first adjusted to reduce the structural gap of the assembly. The crossbeam 9 arranged between the bottom form 1, the side form and the end form 6 is combined with the bracket 10 and the fasteners 11 to carry out combined assembly of the overall formwork system of the box beam. Compared with the original integral welded formwork of the box beam, it can be easily disassembled after the box beam is cast, which is convenient for reuse.

[0033] See also Figure 1-Figure 3 , Figure 6 , Fig. 9The end mold 6 is a rectangular steel plate and its length is greater than the spacing between the side molds. The end mold 6 is pre-set with a through-hole for the core mold 12 and the inlet and outlet of the prestressed tendon pipeline in the box beam. When casting the box beam, the through-hole for the core mold 12 and the inlet and outlet of the prestressed tendon pipeline are sealed. As a rectangular steel plate, the end mold 6 is easy to process. According to the structural design of the box beam, the through-hole for the core mold 12 and the inlet and outlet of the prestressed tendon pipeline are pre-opened on its surface. During installation, a measuring tool is used to ensure that the through-hole for the core mold 12 and the inlet and outlet of the prestressed tendon pipeline are in the correct position. Two left-right symmetrical angle plates 13 are welded and fixed on one side of the end plate. The part of the angle plate 13 perpendicular to the end mold 6 is tightly attached to the wall panel of the bottom mold 1 and is fixed by screwing bolts into the corresponding wire holes on the angle plate 13 and the wall panel. When installing the end plate, the angle plates 13 on both sides are respectively aligned with the two side wall panels of the bottom mold 1, so that the vertical part of the angle plate 13 is tightly attached to the wall panel, and then the bolts are inserted into the vertical part of the angle plate 13 and the corresponding wire holes on the wall panel for connection and locking.

[0034] See also Figure 1-Figure 6 , Fig. 9 , the end plate is symmetrically fixed with a rotating shaft 14, one end of the movable frame 7 is fixedly connected with a turntable 15 that is close to the surface of the end mold 6, the turntable 15 is rotatably connected to the rotating shaft 14 and rotates the movable frame 7 with the rotating shaft 14 as the axis, driving the caster 8 to rise and fall, and the movable frame 7 rotates up and down with the rotating shaft 14 as the axis. When the mold is in use, the movable frame 7 is turned upward to make the caster 8 leave the production platform. When the mold needs to be moved, first use a crane to slightly lift the mold off the production platform, then rotate the movable frame 7 downward to make the caster 8 fall below the bottom mold 1, put down the mold, the caster 8 falls on the production platform, push the mold, and move the mold to a suitable position for use by rolling the caster 8. Two pin holes 16 are provided on one side of the mold 6 near the rotating shaft 14, and both pin holes 16 fall on a circular path with the rotating shaft 14 as the axis. A pin rod 17 is inserted into the edge of the turntable 15 and the pin rod 17 is inserted into the corresponding pin hole 16 to lock the turntable 15 with the end mold 6, keep the caster 8 lifted or fall on the box beam manufacturing platform, and when the movable frame 7 rotates, the turntable 15 rotates accordingly and aligns the hole on the turntable 15 with one of the two pin holes 16. After the pin rod 17 is inserted into the pin hole 16 and the hole on the turntable 15, the turntable 15 is locked with the end mold 6, making the movable frame 7 unable to move. The pin rod 17 is made of high-strength steel, has good compression and bending resistance, and can withstand the weight load of the mold.

[0035] Example 1: Please refer to Figure 6-Figure 8In this embodiment, the sealing structure is a notch 501. A notch 501 with a depth of 0.5 cm is provided at the lower edge of the outer wall of the side panel 4 and the upper edge of the outer wall of the wall panel of the bottom mold 1. A rubber strip that matches the back is embedded in the notch 501, and the crossbeam 9 is pressed against the wall panels of the side panel 4 and the bottom mold 1 to press the rubber strip into the notch 501, so that the rubber strip seals the structural gap between the wall panel of the bottom mold 1 and the side panel 4. Before the crossbeam 9 is installed, the side mold and the bottom mold 1 on one side are assembled, the notches 501 are aligned with each other, and then the rubber strip is inserted into the notch 501, and the rubber strip is welded to the inner wall of the notch 501 by hot melting. The structural gap between the side panel 4 and the wall panel of the bottom mold 1 is sealed with the help of the rubber strip, and then the crossbeam 9 and the side panel 4 are assembled, so that the crossbeam 9 is close to the side panel 4 and the wall panel, and the rubber strip is covered to prevent the rubber strip from being exposed to the outside and aging and damage.

[0036] Example 2: Please refer to Figure 9-11 In this embodiment, the sealing structure is a support plate 502 with a thickness of 0.5-1 cm. The support plate 502 is integrally formed at the upper edge of the wall panel of the bottom mold 1 and the lower edge of the side panel 4. The support plate 502 and the wall panel, the support plate 502 and the side panel 4 are all vertical. A rubber strip is embedded on the surface of the support plate 502, and the upper and lower adjacent support plates 502 are closely attached to each other. Before the installation of the crossbeam 9, the side mold on one side is assembled with the bottom mold 1, and the support plates 502 are aligned with each other to make the rubber strips fit each other. The support plate 502 can be heated to make the two rubber strips melt together, or it can be not heated. The cross beam 9 and the side panel 4 are assembled by welding so that the cross beam 9 is tightly attached to the side panel 4 and the wall panel. A through hole 18 with a width equal to the thickness of two support plates 502 is opened in the middle of the cross beam 9. The support plates 502 that are tightly attached to each other are inserted into the through hole 18 and the rubber strip is squeezed to seal the gap between the support plates 502. When the cross beam 9 is assembled, the through hole 18 is aligned with the support plates 502 that are abutting against each other, so that the support plates 502 pass through the through hole 18, and the inner wall of the through hole 18 is used to limit the two support plates 502, and ensure that the rubber strip is tightly attached to seal the structural gap.

[0037] Through the above steps, the overall formwork system of the box beam can be assembled by combining the crossbeam 9 arranged between the bottom form 1, the side form and the end form 6 in combination with the bracket 10 and the fastener 11. Compared with the original integral welded formwork of the box beam, it can be easily disassembled after the box beam is cast, which is convenient for reuse. By setting a rotatable movable frame 7 on the end plate in conjunction with the casters 8, the formwork can be lifted by hoisting after the box beam is cast. After opening the movable frame 7, the mold can be moved by rolling on the production platform by the casters 8, and casting can be carried out nearby the installation position of the box beam. It is flexible and convenient to use, so as to solve the problem that the existing box beam formwork installation construction method adopts the overall welding forming method which is inconvenient to dismantle and difficult to move, and is not conducive to the nearby casting and installation of the box beam.

Claims

1. A method for constructing a box beam formwork for municipal road and bridge construction, comprising a bottom formwork (1) having a trough structure, a side formwork consisting of a wing plate (2), an eave plate (3), and a side plate (4), an end formwork (6), and a core formwork (12); characterized in that: It also includes a sealing structure, a movable frame (7), casters (8) and a crossbeam (9); the bottom mold (1), the side mold and the end mold (6) are all steel molds, the bottom plate of the bottom mold (1) is stably placed on the box beam manufacturing platform, the wall plate height of the bottom mold (1) is 30-50 cm higher than the bottom surface height of the box beam, and 20-30 cm lower than the bottom surface of the box beam flange, the two side molds are respectively placed on the upper end of the wall plate of the bottom mold (1) and the side plate (4) and the wall plate of the bottom mold (1) are abutted against each other, a sealing structure is arranged between the side plate (4) and the wall plate, the end plate has two groups and is respectively installed at the two ends of the bottom mold (1) and the side mold, the end plate and the wall plate of the bottom mold (1) are connected and fixed by bolt anchors, the left and right ends of the end mold (6) are rotatably connected with the movable frame (7), and the lower end of the movable frame (7) is installed with a The box beam manufacturing platform has casters (8) for movement on the surface, two cross beams (9) are symmetrically arranged between the two end molds (6), and the cross beams (9) are against the outer surfaces of the side panels (4) and the bottom mold (1), two brackets (10) are welded and fixed on one side of the cross beam (9), and there is an angle of 30 degrees between the bracket (10) and the cross beam (9), and the ends of the brackets (10) are fixedly connected with fasteners (11) of a U-shaped structure, and the fasteners (11) on the same cross beam (9) are respectively clamped on the edges of the corresponding end molds (6) and connected and fixed by bolt anchors, and the cross beam (9) and the adjacent side panels (4) are connected and fixed by bolt anchors, and the bottom mold (1), the side mold and the end mold (6) enclose a casting bin of the box beam, and a core mold (12) fixed by the box beam steel bars is arranged in the casting bin.

2. The method for constructing a box beam formwork for municipal road and bridge construction according to claim 1, characterized in that: The end mold (6) is a rectangular steel plate and has a length greater than the spacing between the side molds. A through-hole for the core mold (12) and an inlet and outlet for a prestressed tendon pipeline in the box beam are pre-reserved on the end mold (6). When the box beam is cast, the through-hole for the core mold (12) and the inlet and outlet for the prestressed tendon pipeline are sealed.

3. The method for constructing a box beam formwork for municipal road and bridge construction according to claim 1, characterized in that: Two left-right symmetrical angle plates (13) are welded and fixed on one side of the end plate. The portion of the angle plate (13) perpendicular to the end mold (6) is in close contact with the wall plate of the bottom mold (1) and is fixed by screwing bolts into corresponding threads on the angle plate (13) and the wall plate.

4. The method for constructing a box beam formwork for municipal road and bridge construction according to claim 1, characterized in that: A rotating shaft (14) is fixedly connected to the end plate in a symmetrical manner. A rotating disk (15) is fixedly connected to one end of the movable frame (7) and is closely attached to the surface of the end mold (6). The rotating disk (15) is rotatably connected to the rotating shaft (14) and rotates the movable frame (7) around the rotating shaft (14) as the axis, thereby driving the caster (8) to rise and fall.

5. The method for constructing a box beam formwork for municipal road and bridge construction according to claim 4, characterized in that: Two pin holes (16) are provided on one side of the end mold (6) close to the rotating shaft (14), and both pin holes (16) fall on a circular path with the rotating shaft (14) as the axis. A pin rod (17) is inserted into the edge of the turntable (15) and the pin rod (17) is inserted into the corresponding pin hole (16), so that the turntable (15) and the end mold (6) are locked, and the caster (8) is kept lifted or dropped on the box beam manufacturing platform.

6. The method for constructing a box beam formwork for municipal road and bridge construction according to claim 1, characterized in that: The sealing structure is a notch (501), and a notch (501) with a depth of 0.5 cm is provided at the lower edge of the outer wall of the side plate (4) and the upper edge of the outer wall of the wall plate of the bottom mold (1). A rubber strip that matches the rubber strip is embedded in the notch (501), and the cross beam (9) is pressed against the side plate (4) and the wall plate of the bottom mold (1) to press the rubber strip into the notch (501), so that the rubber strip seals the structural gap between the wall plate of the bottom mold (1) and the side plate (4).

7. The method for constructing a box beam formwork for municipal road and bridge construction according to claim 1, characterized in that: The sealing structure is a support plate (502) with a thickness of 0.5-1 cm. The support plate (502) is integrally formed at the upper edge of the wall plate and the lower edge of the side plate (4) of the bottom mold (1). The support plate (502) and the wall plate, and the support plate (502) and the side plate (4) are all vertical. A rubber strip is embedded on the surface of the support plate (502), and the upper and lower adjacent support plates (502) are closely attached to each other.

8. The method for constructing a box beam formwork for municipal road and bridge construction according to claim 7, characterized in that: A through opening (18) having a width equal to the thickness of two support plates (502) is provided in the middle of the crossbeam (9); the support plates (502) closely attached to each other are inserted into the through opening (18) and the rubber strips are squeezed to seal the gaps between the support plates (502).

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