Prefabricated railway box girder surface gradient control construction method

Abstract

The invention relates to the technical field of prefabricated box girders, in particular to a prefabricated railway box girder surface gradient control construction method which comprises the following steps: S1, pouring a layer of shaping concrete on the top surface of a prefabricated box girder; s2, vibrating the shaped concrete through a vibrating rod; s3, driving a gradient control device to move above the prefabricated box girder through the portal frame, and shaping the shaped concrete by the gradient control device so as to enable the girder surface of the prefabricated box girder to be in a designed shape; s4, repeating the step S3 for 2-4 times; and S5, the gradient control device is moved away through the portal frame, and the shaping concrete is waited to be solidified. According to the beam surface gradient control construction method for the prefabricated railway box beam, a layer of shaping concrete is poured on the top of the prefabricated box beam, then the shaping concrete is shaped into a designed shape through the vibrating rod and the gradient control device, the required gradient requirement is met, and the drainage effect of the beam surface is improved.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated box girders, and in particular to a construction method for controlling the slope of a prefabricated railway box girder. Background Art

[0002] A box girder is a type of beam used 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.

[0003] The box girders of reinforced concrete structures are divided into prefabricated box girders and cast-in-place box girders. Prefabricated box girders are box girders prefabricated in independent sites and can be erected in combination with a bridge-erecting machine after the lower project is completed, which can speed up the project progress and save construction time.

[0004] In order to improve the drainage effect of the beam surface, the beam surface is often designed to a certain extent. Figure 1 , the beam surface is divided into independent rectangular areas. The middle position of each area is the highest, and the four corner points are the lowest. Drainage holes are set at the four corner points to achieve rapid drainage. For this purpose, the slope of the beam surface needs to be controlled. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in order to solve the technical problems in the prior art, the present invention provides a construction method for controlling the slope of a prefabricated railway box girder.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a construction method for controlling the slope of the beam surface of a prefabricated railway box girder, comprising the following steps: S1. pour a layer of shaped concrete on the top surface of the precast box girder; S2, vibrating the shaped concrete by a vibrating rod; S3, driving the slope control device to move above the precast box girder through the gantry, and allowing the slope control device to shape the shaped concrete so that the beam surface of the precast box girder becomes the designed shape; S4, repeat step S3 2 to 4 times; S5. Remove the slope control device through the gantry and wait for the shaped concrete to solidify.

[0007] The invention discloses a construction method for controlling the slope of a prefabricated railway box girder, which achieves the required slope requirement and improves the drainage effect of the beam surface by pouring another layer of shaped concrete on the top of the prefabricated box girder, then shaping the shaped concrete into a designed shape by a vibrating rod and a slope control device.

[0008] Furthermore, the slope device includes a guide rail installed on the formwork of the prefabricated box beam; a movable frame arranged above the prefabricated box beam; a forming assembly arranged on the movable frame, the forming assembly including a forming roller, the forming roller being suitable for contacting the top surface of the prefabricated box beam, the forming roller being arranged along the width direction of the guide rail, and the side wall of the forming roller being arranged in a wavy shape along its own axial direction; two support frames are provided and located at both ends of the movable frame; a movable assembly is arranged on the support frame, and the movable end of the movable assembly is connected to the guide rail to drive the movable frame to move in a wavy curve on the guide rail along the length direction of the guide rail.

[0009] Furthermore, the forming assembly also includes a bracket, a first driving member, a first transmission wheel, a second transmission wheel and a first transmission belt, the bracket is fixedly connected to the movable frame, the bracket is rotatably connected to the forming roller, the first driving member is fixedly connected to the movable frame, the output end of the first driving member is coaxially connected to the first transmission wheel, the second transmission wheel is coaxially connected to the forming roller, and the first transmission belt is sleeved on the first transmission wheel and the second transmission wheel.

[0010] Furthermore, the mobile frame is fixedly connected to the supporting frame, the mobile frame is rotatably connected to a transmission rod, the transmission rod is coaxially connected to a first gear, the output end of the first driving member is coaxially connected to a second gear, and the first gear is meshed with the second gear.

[0011] Furthermore, the moving assembly includes a first support plate, a first rotating shaft and a first roller, the first support plate is fixedly connected to the support frame, the first support plate is rotatably connected to the first rotating shaft, the first rotating shaft is coaxially fixedly connected to the first roller, a first guide groove is opened on the side of the guide rail, the bottom wall of the first guide groove is arranged in a wave curve, the first roller is located in the first guide groove, and the transmission rod and the first rotating shaft are sleeved with the same second transmission belt.

[0012] Furthermore, the movable frame is fixedly connected to the supporting frame, and the movable assembly includes a second support plate, a second rotating shaft and a second roller, the second support plate is fixedly connected to the supporting frame, the second support plate is rotatably connected to the second rotating shaft, the second rotating shaft is fixedly connected to the second roller, a second guide groove is provided on the top surface of the guide rail, the first roller is located in the first guide groove, the second rotating shaft and the second roller are eccentrically arranged, and the transmission rod and the second rotating shaft are sleeved with the same third transmission belt.

[0013] Further, the mobile frame is slidably connected to the support frame in the vertical direction, the mobile assembly includes a third support plate, a third rotating shaft and a third roller, the third support plate is fixedly connected to the mobile frame, the third rotating shaft is rotatably connected to the third support plate, the third rotating shaft is fixedly connected to the third roller and is eccentrically arranged, a third guide groove is opened on the top surface of the guide rail, and the third roller is located in the third guide groove; The support frame is fixedly connected with a second driving member, the output end of the second driving member is coaxially fixedly connected with a third gear, the side wall of the guide rail is fixedly connected with a rack, and the third gear is meshed with the rack.

[0014] Furthermore, a support wheel is rotatably connected to the bottom of the support frame, and the support wheel is located in the third guide groove.

[0015] Further, in step S3, the gantry is used to drive the movable frame to move above the guide rail and move the movable frame downward, firstly the third gear is meshed with the rack, and then the third roller falls into the first guide groove, and then the second driving member drives the third gear to rotate, driving the support frame to move on the guide rail. At this time, the gantry synchronously drives the support frame to move, and the beam surface is shaped by the forming roller so that the beam surface of the prefabricated box beam becomes the designed shape.

[0016] Furthermore, when the third gear moves down to a state of meshing with the rack, the distance between the third rotating shaft and the drainage hole is measured along the length direction of the guide rail, and the angle of the third rotating shaft is adjusted according to the distance between the third rotating shaft and the drainage hole, so that when the forming roller moves to the drainage hole, the distance between the third rotating shaft and the bottom of the third guide groove is minimized, and then the third roller is locked by the locking bolt, and the moving frame continues to move downward until the wheel surface of the third roller contacts the bottom of the third guide groove, and the locking bolt is loosened at this time.

[0017] The beneficial effects of the present invention are: 1. By pouring another layer of shaped concrete on the top of the prefabricated box beam, and then using a vibrator to shape the shaped concrete, and then using a slope control device to shape it into the designed shape, the required slope requirements are achieved and the drainage effect of the beam surface is improved; 2. The side wall of the forming roller is arranged in a wavy shape along its own axial direction, so that the beam surface is formed in a wavy shape along the width direction of the guide rail. At the same time, the moving assembly drives the moving frame to move in a wavy curve along the direction of the guide rail, so that the beam surface is formed in a wavy shape along the length direction of the guide rail, thereby forming a beam surface that is easy to drain, with high precision and high construction efficiency; 3. The support frame is moved along the length direction of the guide rail by the cooperation of the third gear and the rack, and the movable frame is moved in the vertical direction by the eccentric setting of the third roller and the third rotating shaft. The combination of the two enables the movable frame to move in a wave shape along the length direction of the guide rail. At the same time, the third rotating shaft and the roller do not participate in the driving, which can improve the stability of the movement and ensure the movement accuracy. At the same time, the guide rail can be a straight guide rail, which is convenient to produce and install. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a top view schematic diagram of a beam surface and a drainage hole in the background technology.

[0020] Figure 2 It is a schematic diagram of the overall structure of the slope control device in the present invention.

[0021] Figure 3 It is a schematic diagram of embodiment 1 of the present invention.

[0022] Figure 4 It is a schematic diagram of Embodiment 2 of the present invention.

[0023] Figure 5 It is a schematic diagram of embodiment 3 of the present invention.

[0024] Figure 6 It is a schematic diagram of the third rotating shaft in the present invention.

[0025] Figure 7 The present invention is a schematic flow chart of a construction method for controlling the slope of a prefabricated railway box girder.

[0026] In the figure: 1, guide rail; 11, first guide groove; 12, second guide groove; 13, third guide groove; 2, support frame; 3, mobile frame; 31, transmission rod; 32, first gear; 33, second gear; 4, forming assembly; 41, forming roller; 42, bracket; 43, first driving member; 44, first transmission wheel; 45, second transmission wheel; 46, first transmission belt; 5, mobile assembly; 51, first support plate; 511, first rotating shaft; 512, first roller; 513, second transmission belt; 52, second support plate; 521, second rotating shaft; 522, second roller; 523, third transmission belt; 53, third support plate; 531, third rotating shaft; 532, third roller; 533, second driving member; 534, third gear; 535, rack; 536, support wheel; 6, beam surface; 61, drainage hole; 62, middle position. DETAILED DESCRIPTION

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The invention discloses a construction method for controlling the slope of a prefabricated railway box girder.

[0030] A construction method for controlling the slope of a prefabricated railway box girder surface adopts a slope control device for construction, so the slope control device is firstly described.

[0031] Reference Figure 1 and Figure 2 The slope control device includes a guide rail 1, which is fixedly mounted on the formwork of the prefabricated box beam. There are two groups of guide rails 1, which are respectively located on the formworks on both sides of the prefabricated box beam. A support frame 2 is provided above each guide rail 1, and the same mobile frame 3 is connected between the two support frames 2, and the mobile frame 3 is located above the prefabricated box beam. A forming assembly 4 is provided on the mobile frame 3, and the forming assembly 4 includes a forming roller 41, which is suitable for contacting the top surface of the prefabricated box beam, and the forming roller 41 is arranged along the width direction of the guide rail 1. The side wall of the forming roller 41 is arranged in a wavy shape along its own axial direction. A moving assembly 5 is provided on the support frame 2, and the movable end of the moving assembly 5 is connected to the guide rail 1 to drive the mobile frame 3 to move in a wavy curve on the guide rail 1 along the length direction of the guide rail 1. The bottom of the support frame 2 is rotatably connected to a support wheel 536, and the support wheel 536 is connected to the guide rail 1 to support the support frame 2. In addition, the support frame 2 and the moving frame 3 work under the gantry, and the hooks of the two groups of cranes on the gantry are respectively connected to the two support frames 2, and the cranes move with the support frames 2 to ensure that the support frames 2 can move smoothly.

[0032] By arranging the side wall of the forming roller 41 in a wavy shape along its own axial direction, it is convenient to form the beam surface 6 in a wavy shape along the width direction of the guide rail 1. At the same time, the moving frame 3 is driven by the moving component 5 to move in a wavy curve along the direction of the guide rail 1, so that the beam surface 6 forms a wavy shape along the length direction of the guide rail 1, thereby facilitating the formation of a beam surface 6 that is easy to drain, with high precision and high construction efficiency.

[0033] Specifically, the molding assembly 4 further includes a bracket 42, a first driving member 43, a first transmission wheel 44, a second transmission wheel 45 and a first transmission belt 46. The bracket 42 is fixedly connected to the mobile frame 3, and the bracket 42 is rotationally connected to the molding roller 41. The first driving member 43 is fixedly connected to the mobile frame 3, the output end of the first driving member 43 is coaxially connected to the first transmission wheel 44, the second transmission wheel 45 is coaxially connected to the molding roller 41, and the first transmission belt 46 is sleeved on the first transmission wheel 44 and the second transmission wheel 45. The output end of the first driving member 43 rotates, driving the first transmission wheel 44 to rotate, and the first transmission wheel 44 drives the second transmission wheel 45 to rotate through the first transmission belt 46, thereby driving the molding roller 41 to rotate. The first driving member 43 can be a stepping motor, and the first transmission wheel 44, the second transmission wheel 45 and the first transmission belt 46 can be chain driven or synchronous belt driven.

[0034] Embodiment 1: Reference Figure 3 The movable frame 3 is fixedly connected to the supporting frame 2, and a transmission rod 31 is rotatably connected to the movable frame 3. A first gear 32 is coaxially connected to the transmission rod 31. The output end of the first driving member 43 is coaxially connected to the second gear 33. The first gear 32 is meshed with the second gear 33, so that when the output end of the first driving member 43 rotates, the transmission rod 31 can be driven to rotate at the same time.

[0035] The moving assembly 5 includes a first support plate 51, a first rotating shaft 511 and a first roller 512. The first support plate 51 is fixedly connected to the support frame 2, the first support plate 51 is rotatably connected to the first rotating shaft 511, the first rotating shaft 511 is coaxially fixedly connected to the first roller 512, a first guide groove 11 is provided on the side of the guide rail 1, the bottom wall of the first guide groove 11 is arranged in a wave curve, and the first roller 512 is located in the first guide groove 11. The transmission rod 31 and the first rotating shaft 511 are sleeved with the same second transmission belt 513, and the transmission rod 31 drives the first rotating shaft 511 to rotate through the second transmission belt 513, so that when the output end of the first driving member 43 rotates, the forming roller 41 and the first roller 512 both rotate, so as to realize the self-rotation of the forming roller 41 and the movement of the first roller 512 synchronously, and after the moving frame 3 stops moving, there is no need to control the forming roller 41 separately. The second transmission belt 513 can be a chain or a synchronous belt. In this embodiment, the supporting wheel 536 is located in the first guide groove 11 (not shown in the figure).

[0036] Embodiment 2: Reference Figure 4 , which is different from the embodiment 1, the moving assembly 5 comprises a second support plate 52, a second rotating shaft 521 and a second roller 522, the second support plate 52 is fixedly connected to the support frame 2, the second support plate 52 is rotatably connected to the second rotating shaft 521, the second rotating shaft 521 is fixedly connected to the second roller 522, the top surface of the guide rail 1 is provided with a second guide groove 12, the first roller 512 is located in the first guide groove 11, and the second rotating shaft 521 and the second roller 522 are eccentrically arranged. The transmission rod 31 and the second rotating shaft 521 are sleeved with the same third transmission belt 523, and the transmission rod 31 drives the second rotating shaft 521 to rotate through the third transmission belt 523, so that when the output end of the first driving member 43 rotates, the forming roller 41 and the second roller 522 both rotate, so that the self-rotation of the forming roller 41 and the movement of the second roller 522 are synchronized, and after the moving frame 3 stops moving, there is no need to control the forming roller 41 separately. By setting the second rotating shaft, the second roller and the second guide groove, the guide rail does not need to be specially designed. It only needs to adjust the second roller according to the designed slope. If a different slope needs to be shaped, the second roller can be replaced. The cost is low and the versatility is high. In this embodiment, the support wheel 536 is located in the second guide groove 12 (not shown in the figure).

[0037] Embodiment 3: Reference Figure 5 and Figure 6, which is different from the embodiment 1, the moving frame 3 is connected to the supporting frame 2 in a sliding manner in the vertical direction, the moving assembly 5 comprises a third supporting plate 53, a third rotating shaft 531 and a third roller 532, the third supporting plate 53 is fixedly connected to the moving frame 3, the third rotating shaft 531 is rotatably connected to the third supporting plate 53, the third rotating shaft 531 is fixedly connected to the third roller 532 and is eccentrically arranged, a third guide groove 13 is provided on the top surface of the guide rail 1, and the third roller 532 is located in the third guide groove 13. A second driving member 533 is fixedly connected to the supporting frame 2, and a third gear 534 is coaxially fixedly connected to the output end of the second driving member 533, a rack 535 is fixedly connected to the side wall of the guide rail 1, and the third gear 534 is meshed with the rack 535. In this embodiment, the support wheel 536 is located in the third guide groove 13. The third support plate 53 is threadedly connected with a locking bolt 537, which is suitable for abutting against the end face of the third roller 532 so as to lock the third roller 532. The third gear 534 cooperates with the rack 535 to realize the movement of the support frame 2 along the length direction of the guide rail 1, and the third roller 532 and the third rotating shaft 531 are eccentrically arranged to realize the movement of the mobile frame 3 in the vertical direction. The combination of the two makes the mobile frame 3 move in a wave shape along the length direction of the guide rail 1. At the same time, the third rotating shaft 531 and the roller do not participate in the drive, which can improve the stability of the movement and ensure the movement accuracy. At the same time, the guide rail 1 can be a straight guide rail 1, which is convenient for production and installation. The second driving member 533 can be a stepping motor, and the third transmission belt 523 can be a chain or a synchronous belt.

[0038] Reference Figure 7 A construction method for controlling the slope of a prefabricated railway box girder comprises the following steps: S1. Pour a layer of shaped concrete on the top surface of the precast box girder.

[0039] S2. Vibrate the shaped concrete using a vibrating rod.

[0040] S3, the slope control device is driven to move above the prefabricated box beam through the gantry, and the slope control device is used to shape the shaped concrete, so that the beam surface 6 of the prefabricated box beam becomes the designed shape. When working, the mobile frame 3 is first driven to move above the guide rail 1 through the gantry, and the mobile frame 3 is moved down, and the third gear 534 is first engaged with the rack 535, and then the third roller 532 falls into the first guide groove 11, and then the second driving member 533 drives the third gear 534 to rotate, driving the support frame 2 to move on the guide rail 1, and the gantry synchronously drives the support frame 2 to move, and the beam surface 6 is shaped by the forming roller 41, so that the beam surface 6 of the prefabricated box beam becomes the designed shape.

[0041] When the third gear 534 moves down to the meshing state with the rack 535, the support wheel 536 contacts the bottom of the third guide groove 13 to support the support frame 2, and the distance between the third rotating shaft 531 and the drainage hole 61 is measured along the length direction of the guide rail 1, and the angle of the third rotating shaft 531 is adjusted according to the distance between the third rotating shaft 531 and the drainage hole 61, so that when the forming roller 41 moves to the drainage hole 61, the distance between the third rotating shaft 531 and the bottom of the third guide groove 13 is minimized, and then the third roller 532 is locked by the locking bolt, and the moving frame 3 continues to move down until the wheel surface of the third roller 532 contacts the bottom of the third guide groove 13, and the locking bolt is loosened at this time to ensure that the beam surface 6 at the drainage hole 61 is the lowest along the length direction of the guide rail 1, so as to ensure the drainage effect. After the third roller 532 contacts the wheel surface, the hook of the crane on the gantry is connected to the support frame 2 to drive the support frame 2 to move.

[0042] S4, repeat step S3 2 to 4 times, 3 times in this embodiment.

[0043] S5. Remove the slope control device through the gantry and wait for the shaped concrete to solidify.

[0044] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A construction method for controlling the slope of a prefabricated railway box girder, characterized in that: The steps include: S1. pour a layer of shaped concrete on the top surface of the precast box girder; S2, vibrating the shaped concrete by a vibrating rod; S3, driving the slope control device to move above the precast box girder through the gantry, and allowing the slope control device to shape the shaped concrete so that the beam surface of the precast box girder becomes the designed shape; S4, repeat step S3 2 to 4 times; S5. Remove the slope control device through the gantry and wait for the shaped concrete to solidify.

2. A construction method for controlling the slope of a prefabricated railway box girder according to claim 1, characterized in that: The slope control device comprises A guide rail (1) is installed on a formwork of a prefabricated box beam; A movable frame (3) is arranged above the prefabricated box beam; A forming assembly (4) is arranged on the movable frame (3), the forming assembly (4) comprising a forming roller (41), the forming roller (41) being suitable for contacting the top surface of the prefabricated box beam, the forming roller (41) being arranged along the width direction of the guide rail (1), and the side wall of the forming roller (41) being arranged in a wave shape along its own axial direction; Two support frames (2) are provided and are located at both ends of the moving frame (3); A moving assembly (5) is arranged on the support frame (2), and a movable end of the moving assembly (5) is connected to the guide rail (1) to drive the moving frame (3) to move on the guide rail (1) in a wave curve along the length direction of the guide rail (1).

3. A construction method for controlling the slope of a prefabricated railway box girder according to claim 2, characterized in that: The molding assembly (4) further comprises a bracket (42), a first driving member (43), a first transmission wheel (44), a second transmission wheel (45) and a first transmission belt (46); the bracket (42) is fixedly connected to the movable frame (3); the bracket (42) is rotationally connected to the molding roller (41); the first driving member (43) is fixedly connected to the movable frame (3); the output end of the first driving member (43) is coaxially connected to the first transmission wheel (44); the second transmission wheel (45) is coaxially connected to the molding roller (41); and the first transmission belt (46) is sleeved on the first transmission wheel (44) and the second transmission wheel (45).

4. A construction method for controlling the slope of a prefabricated railway box girder according to claim 3, characterized in that: The movable frame (3) is fixedly connected to the supporting frame (2); a transmission rod (31) is rotatably connected to the movable frame (3); a first gear (32) is coaxially connected to the transmission rod (31); an output end of the first driving member (43) is coaxially connected to a second gear (33); the first gear (32) is meshed with the second gear (33).

5. A construction method for controlling the slope of a prefabricated railway box girder as claimed in claim 3, characterized in that: The moving assembly (5) comprises a first support plate (51), a first rotating shaft (511) and a first roller (512); the first support plate (51) is fixedly connected to the support frame (2); the first support plate (51) is rotatably connected to the first rotating shaft (511); the first rotating shaft (511) and the first roller (512) are coaxially fixedly connected; a first guide groove (11) is provided on a side surface of the guide rail (1); a bottom wall of the first guide groove (11) is arranged in a wave curve; the first roller (512) is located in the first guide groove (11); and a second transmission belt (513) is sleeved on the transmission rod (31) and the first rotating shaft (511).

6. A construction method for controlling the slope of a prefabricated railway box girder as claimed in claim 3, characterized in that: The movable frame (3) is fixedly connected to the supporting frame (2); the movable assembly (5) comprises a second supporting plate (52), a second rotating shaft (521) and a second roller (522); the second supporting plate (52) is fixedly connected to the supporting frame (2); the second supporting plate (52) is rotatably connected to the second rotating shaft (521); the second rotating shaft (521) is fixedly connected to the second roller (522); a second guide groove (12) is provided on the top surface of the guide rail (1); the first roller (512) is located in the first guide groove (11); the second rotating shaft (521) and the second roller (522) are eccentrically arranged; and the transmission rod (31) and the second rotating shaft (521) are sleeved with the same third transmission belt (523).

7. A construction method for controlling the slope of a prefabricated railway box girder as claimed in claim 6, characterized in that: The movable frame (3) is slidably connected to the support frame (2) along the vertical direction; the movable assembly (5) comprises a third support plate (53), a third rotating shaft (531) and a third roller (532); the third support plate (53) is fixedly connected to the movable frame (3); the third rotating shaft (531) is rotatably connected to the third support plate (53); the third rotating shaft (531) is fixedly connected to the third roller (532) and is eccentrically arranged; a third guide groove (13) is provided on the top surface of the guide rail (1); and the third roller (532) is located in the third guide groove (13); A second driving member (533) is fixedly connected to the support frame (2), and a third gear (534) is coaxially fixedly connected to the output end of the second driving member (533). A rack (535) is fixedly connected to the side wall of the guide rail (1), and the third gear (534) is meshed with the rack (535). A locking bolt is threadedly connected to the third support plate (53), and the locking bolt is suitable for abutting against the end surface of the third roller (532).

8. A construction method for controlling the slope of a prefabricated railway box girder as claimed in claim 2, characterized in that: The bottom of the support frame (2) is rotatably connected to a support wheel (536), and the support wheel (536) cooperates with the guide rail (1) and can slide relative to the guide rail (1).

9. A construction method for controlling the slope of a prefabricated railway box girder as claimed in claim 7, characterized in that: In step S3, the gantry drives the movable frame (3) to move above the guide rail (1), and the movable frame (3) moves downward, firstly the third gear (534) is meshed with the rack (535), then the third roller (532) falls into the first guide groove (11), and then the second driving member (533) drives the third gear (534) to rotate, driving the support frame (2) to move on the guide rail (1). At this time, the gantry drives the support frame (2) to move synchronously, and the beam surface (6) is shaped by the forming roller (41) so that the beam surface (6) of the prefabricated box beam becomes the designed shape.

10. A construction method for controlling the slope of a prefabricated railway box girder as claimed in claim 9, characterized in that: When the third gear (534) moves downward to a state of meshing with the rack (535), the distance between the third rotating shaft (531) and the drainage hole (61) is measured along the length direction of the guide rail (1), and the angle of the third rotating shaft (531) is adjusted according to the distance between the third rotating shaft (531) and the drainage hole (61), so that when the forming roller (41) moves to the drainage hole (61), the distance between the third rotating shaft (531) and the bottom of the third guide groove (13) is minimized, and then the third roller (532) is locked by the locking bolt, and the moving frame (3) continues to move downward until the wheel surface of the third roller (532) contacts the bottom of the third guide groove (13), and the locking bolt is loosened at this time.

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