Automatic prefabricating and tensioning construction process for prefabricated box girder

Abstract

The invention relates to the technical field of prefabricated box girder prefabricating, in particular to a prefabricated box girder automatic prefabricating and tensioning construction technology which comprises the following steps that S1, a movable platform is moved to an initial station, and a bottom die and a side die are installed on the movable platform; s2, the movable platform moves to a lower reinforcing steel bar station, and a lower reinforcing steel bar cage is hoisted to the bottom die and the side die; s3, moving to an inner mold station, and hoisting and mounting an inner mold on the lower reinforcement cage; s4, the upper reinforcement cage is moved to an upper reinforcement station, and the upper reinforcement cage is hoisted to the inner mold; s5, moving to a pouring station, mounting an end mold, and pouring concrete; s6, moving to a mold removal station, removing the mold after the concrete is solidified to obtain a prefabricated box girder, and placing the prefabricated box girder on a bottom mold; s7, the prefabricated box girder is moved to a maintenance station, and the prefabricated box girder is maintained through a maintenance device; and S8, the prefabricated box girder is moved to a tensioning station, the prefabricated box girder is tensioned through a tensioning device, the prefabricated box girder is transferred to a box girder storage area after tensioning is completed, and the moving platform is moved to an initial station.

Description

Technical Field

[0001] This invention relates to the field of precast box girder technology, and in particular to an automated precasting and tensioning process for precast box girders. Background Technology

[0002] Precast box girders are commonly used in bridges. As the name suggests, they are box-like beams with a hollow interior. Box girder prefabrication technology is a construction method where components are prefabricated and then transported to the construction site for assembly. Box girder prefabrication technology has become an important technology in modern bridge construction, boasting a high level of industrialization and advanced production processes. It directly improves project quality, reducing costs while increasing speed and quality. Furthermore, it enhances the safety and cleanliness of construction sites, reduces environmental impact, and meets the needs of modern urban construction.

[0003] In existing precast box girder production, the production is generally carried out in a fixed location. However, the steel cage, inner mold, casting device, curing device, tensioning device and other equipment required in the production process all need to be transferred from other locations to the location of the precast box girder. The coordination in this process is quite troublesome, which often leads to low efficiency and occupies a larger area, resulting in a lot of wasted space. Summary of the Invention

[0004] 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 an automated prefabrication and tensioning construction process for precast box girders.

[0005] The technical solution adopted by this invention to solve its technical problem is: an automated prefabrication and tensioning construction process for precast box girders, comprising the following steps: S1, the mobile platform is moved to the initial position, and the bottom formwork and side formwork are installed on the mobile platform; S2, the mobile platform is moved to the lower reinforcement position, and the lower reinforcement cage is hoisted and installed on the bottom formwork and side formwork; S3, the mobile platform is moved to the inner formwork position, and the inner formwork is hoisted and installed on the lower reinforcement cage; S4, the mobile platform is moved to the upper reinforcement position, and the upper reinforcement cage is hoisted and installed on the inner formwork and lower reinforcement cage. S5. The mobile platform moves to the pouring position, installs the end formwork, and pours concrete; S6. The mobile platform moves to the demolding position, and after the concrete has solidified, the formwork is removed, the side formwork and inner formwork are removed, and the precast box girder is obtained. The precast box girder is placed on the bottom formwork; S7. The mobile platform moves to the curing position, and the precast box girder is cured using the curing device; S8. The mobile platform moves to the tensioning position, and the precast box girder is tensioned using the tensioning device. After tensioning is completed, the precast box girder is transferred to the box girder storage area, and the mobile platform moves back to the initial position.

[0006] The automated prefabrication and tensioning construction process for precast box girders of this invention utilizes a mobile platform. This platform can be moved to various work positions, including the initial work position, the lower rebar work position, the inner formwork work position, the upper rebar work position, the pouring work position, the formwork removal work position, the curing work position, and the tensioning work position. Corresponding operations are then performed at each work position to achieve the prefabrication and tensioning of the precast box girder. This method only requires moving the mobile platform, improving the convenience of construction and making fuller use of the site, thereby increasing the production efficiency of precast box girders.

[0007] Furthermore, the mobile platform is installed on a circulating track, which includes a first track, a second track, a third track, and a fourth track connected in sequence. The first track passes through the initial station, the lower rebar station, the inner formwork station, and the upper rebar station. The second track passes through the pouring station, the demolding station, the curing station, and the tensioning station. The third track passes through the tensioning station, and the fourth track passes through the initial station.

[0008] The above technical solution enables the mobile platform to move cyclically via the first, second, third, and fourth tracks, thereby allowing the prefabrication and tensioning of precast box girders to proceed in a cyclical manner and further improving production efficiency.

[0009] Furthermore, the second track is set perpendicular to the first track, and multiple sets of the second track, the pouring station, the demolding station, the curing station and the tensioning station are provided along the length direction of the first track. The first track is connected to several second tracks.

[0010] With the above technical solution, the pouring, solidification, demolding, curing and tensioning of concrete all require a long time. Therefore, a set of first track workstations can correspond to several sets of second track workstations, thereby making full use of the production efficiency of each workstation on the first track.

[0011] Furthermore, the bottom of the mobile platform is provided with a first moving component and a second moving component. The first moving component is used to drive the mobile platform to move on a first track and a third track, and the second moving component is used to drive the mobile platform to move on a second track and a fourth track.

[0012] Furthermore, the first moving component includes a first telescopic member, a first frame, and a first moving wheel. The first telescopic member is fixedly installed inside the moving platform, the movable end of the first telescopic member is fixedly connected to the first frame, the first moving wheel is rotatably connected to the first frame, and the axis of the first moving wheel is parallel to the length direction of the second track. The second moving component includes a second telescopic member, a second frame, and a second moving wheel. The second telescopic member is fixedly installed inside the moving platform, and the movable end of the second telescopic member is fixedly connected to the second frame. The second moving wheel is rotatably connected to the second frame, and the axis of the second moving wheel is parallel to the length direction of the first track.

[0013] With the above technical solution, when the mobile platform needs to move on the first or third track, the movable end of the first telescopic member extends, allowing the first moving wheel to enter the first or third track, thereby enabling the mobile platform to move on the first or third track; when the mobile platform needs to move on the second or fourth track, the movable end of the second telescopic member extends, the movable end of the first telescopic member retracts, and the second moving wheel enters the second or fourth track, enabling the mobile platform to move on the second or fourth track, thereby enabling the mobile platform to move cyclically on the loop track.

[0014] Furthermore, the fourth track is provided with an assembly station, and the assembly station is provided with a first hoisting assembly, which is used to hoist the side mold onto the mobile platform.

[0015] The above technical solution allows the side mold to be hoisted onto the mobile platform using the first hoisting component, facilitating subsequent operations.

[0016] Furthermore, a second hoisting assembly is provided on one side of the lower rebar station, which is used to hoist the lower rebar cage onto the bottom formwork and side formwork; A third hoisting assembly is provided on one side of the inner mold station, which is used to hoist the inner mold onto the lower steel cage; A fourth hoisting assembly is provided on one side of the upper rebar station, which is used to hoist the upper rebar cage onto the inner formwork and the lower rebar cage.

[0017] Furthermore, the circulating track is buried in the ground, and the top surface of the circulating track is lower than the ground surface.

[0018] Furthermore, the maintenance device includes a maintenance trolley, a first maintenance pipe, and a second maintenance pipe. The maintenance trolley can move along the length of the first track. The first maintenance pipe is used for spraying and curing the outer side of the precast box girder, and the second maintenance pipe is used for spraying and curing the inner side of the precast box girder.

[0019] The above technical solution enables simultaneous curing of the inside and outside of the precast box girder through the first and second curing pipes, thereby improving curing efficiency.

[0020] Furthermore, the tensioning device includes a gantry frame, the bottom of which is provided with a movable component for adjusting the position of the gantry frame, and the top of which is provided with a position adjustment component. The movable end of the position adjustment component is connected to a hoisting component, and the hoisting component has two movable ends. The two movable ends of the hoisting component are connected to the same first jack, and the two ends of the first jack along its own axial direction are respectively connected to the two movable ends of the hoisting component.

[0021] The beneficial effects of this invention are: 1. By moving the mobile platform, the platform can be moved to the initial work station, the lower rebar work station, the inner formwork work station, the upper rebar work station, the pouring work station, the formwork removal work station, the curing work station, and the tensioning work station. Then, corresponding operations can be performed at different work stations to realize the prefabrication and tensioning of precast box girders. This method only requires moving the mobile platform, which improves the convenience of construction and makes fuller use of the site, thereby improving the production efficiency of precast box girders. 2. The pouring, solidification, demolding, curing and tensioning of concrete all require a long time. Therefore, one set of first track workstations can correspond to several sets of second track workstations, thereby making full use of the production efficiency of each workstation on the first track. 3. When the mobile platform needs to move on the first or third track, the movable end of the first telescopic member extends, allowing the first moving wheel to enter the first or third track, thus enabling the mobile platform to move on the first or third track; when the mobile platform needs to move on the second or fourth track, the movable end of the second telescopic member extends, the movable end of the first telescopic member retracts, and the second moving wheel enters the second or fourth track, enabling the mobile platform to move on the second or fourth track, thus enabling the mobile platform to move cyclically on the loop track. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the overall structure of the precast box girder automated prefabrication and tensioning construction site layout in this invention.

[0024] Figure 2 This is a structural schematic diagram illustrating the first and second moving components in this invention.

[0025] Figure 3 This is a schematic diagram illustrating the structure of the maintenance device in this invention.

[0026] Figure 4 This is a schematic diagram illustrating the structure of the tensioning device in this invention.

[0027] Figure 5 This is a schematic diagram illustrating the structure of the position adjustment component in this invention.

[0028] Figure 6 This is a schematic diagram illustrating the structure of the lifting device in this invention.

[0029] In the diagram: 1. Mobile platform; 11. First mobile component; 111. First telescopic component; 112. First frame; 113. First moving wheel; 12. Second mobile component; 121. Second telescopic component; 122. Second frame; 123. Second moving wheel; 2. Initial station; 21. Lower rebar station; 22. Inner mold station; 23. Upper rebar station; 24. Pouring station; 25. Formwork removal station; 26. Curing station; 27. Tensioning station; 28. Assembly station; 3. Circulating track; 31. First track; 32. Second track; 33. Third track; 34. Fourth track; 4. First hoisting component; 41. Second hoisting component; 42. Third hoisting component; 43. Fourth hoisting component Components; 5. Curing device; 51. Curing trolley; 52. First curing pipe; 53. Second curing pipe; 6. Tensioning device; 61. Gantry frame; 62. Moving plate; 63. Rotating wheel; 64. Second jack; 65. Support plate; 66. Position adjustment assembly; 661. First guide rail; 662. Rack; 663. Transverse sliding plate; 664. Gear; 665. First motor; 67. Longitudinal adjustment plate; 671. Second motor; 672. Second guide rail; 673. Screw; 674. Sliding block; 68. Lifting component; 681. Crane; 682. Lifting tool; 683. Rotary drum; 684. Ratchet; 685. Pad; 686. Torsion spring; 687. Handwheel; 69. First jack. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium; or as a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Example 1

[0032] In a first aspect, the present invention discloses an automated prefabrication and tensioning construction process for precast box girders.

[0033] Reference Figures 1 to 6 An automated prefabrication and tensioning construction process for precast box girders, referring to... Figure 1 It includes the following steps: S1. Move the mobile platform 1 to the initial station 2 and install the bottom mold and side mold on the mobile platform 1; S2. The mobile platform 1 moves to the lower rebar station 21 and hoists and installs the lower rebar cage onto the bottom formwork and side formwork. S3. Move the mobile platform 1 to the inner formwork station 22, hoist the inner formwork and install it on the lower steel cage; S4. Move the mobile platform 1 to the upper rebar station 23, hoist the upper rebar cage and install it on the inner formwork and the lower rebar cage; S5. Move the mobile platform 1 to the pouring station 24, install the end formwork and pour concrete; S6. Move the mobile platform 1 to the demolding station 25; after the concrete has solidified, demold the side formwork and inner formwork to obtain the precast box girder, which is then placed on the bottom formwork. S7. The mobile platform 1 moves to the maintenance station 26 and the precast box girder is maintained by the maintenance device 5. S8. The mobile platform 1 moves to the tensioning station 27 and tensions the precast box girder through the tensioning device 6. After tensioning is completed, the precast box girder is transferred to the box girder storage area, and the mobile platform 1 moves to the initial station 2.

[0034] By moving the mobile platform 1, it can be moved to the initial work station 2, the lower rebar work station 21, the inner formwork work station 22, the upper rebar work station 23, the pouring work station 24, the formwork removal work station 25, the curing work station 26, and the tensioning work station 27. Then, corresponding operations can be performed at different work stations to realize the prefabrication and tensioning of precast box girders. This method only requires moving the mobile platform 1, which improves the convenience of construction and makes fuller use of the site, thereby improving the production efficiency of precast box girders.

[0035] The mobile platform 1 is installed on the circulating track 3, which includes a first track 31, a second track 32, a third track 33, and a fourth track 34 connected in sequence. The first track 31 passes through the initial station 2, the lower rebar station 21, the inner formwork station 22, and the upper rebar station 23. The second track 32 passes through the pouring station 24, the formwork removal station 25, the curing station 26, and the tensioning station 27. The third track 33 passes through the tensioning station 27, and the fourth track 34 passes through the initial station 2. The mobile platform 1 moves cyclically through the first track 31, the second track 32, the third track 33, and the fourth track 34, thereby enabling the prefabrication and tensioning of the precast box girder to be carried out cyclically, further improving production efficiency.

[0036] The second track 32 is set perpendicular to the first track 31. Multiple sets of the second track 32, pouring station 24, demolding station 25, curing station 26, and tensioning station 27 are arranged along the length of the first track 31. The first track 31 is connected to several second tracks 32. Since concrete pouring, solidification, demolding, curing, and tensioning all require a considerable amount of time, one set of stations on the first track 31 can correspond to several sets of stations on the second track 32, thus fully utilizing the production efficiency of each station on the first track 31.

[0037] The bottom of the mobile platform 1 is provided with a first moving component 11 and a second moving component 12. The first moving component 11 is used to drive the mobile platform 1 to move on the first track 31 and the third track 33, and the second moving component 12 is used to drive the mobile platform 1 to move on the second track 32 and the fourth track 34.

[0038] Specifically, the first moving component 11 includes a first telescopic member 111, a first frame 112, and a first moving wheel 113. The first telescopic member 111 is fixedly installed inside the moving platform 1. The movable end of the first telescopic member 111 is fixedly connected to the first frame 112. The first moving wheel 113 is rotatably connected to the first frame 112. The axis of the first moving wheel 113 is parallel to the length direction of the second track 32.

[0039] The second moving component 12 includes a second telescopic member 121, a second frame 122, and a second moving wheel 123. The second telescopic member 121 is fixedly installed inside the moving platform 1, and its movable end is fixedly connected to the second frame 122. The second moving wheel 123 is rotatably connected to the second frame 122, and the axis of the second moving wheel 123 is parallel to the length direction of the first track 31. In this embodiment, both the first moving component 11 and the second moving component 12 are provided with at least four sets.

[0040] It should be noted that the first telescopic component 111 and the second telescopic component 121 can be jacks. The first moving wheel 113 and the second moving wheel 123 can also be driven by a motor to achieve automatic movement, and the moving platform 1 can be connected to the ground every time it moves to a work station.

[0041] When the mobile platform 1 needs to move on the first track 31 or the third track 33, the movable end of the first telescopic member 111 extends, so that the first moving wheel 113 enters the first track 31 or the third track 33, thereby enabling the mobile platform 1 to move on the first track 31 or the third track 33; when the mobile platform 1 needs to move on the second track 32 or the fourth track 34, the movable end of the second telescopic member 121 extends, the movable end of the first telescopic member 111 retracts, and the second moving wheel 123 enters the second track 32 or the fourth track 34, so that the mobile platform 1 can move on the second track 32 or the fourth track 34, thereby enabling the mobile platform 1 to move cyclically on the loop track 3.

[0042] An assembly station 28 is provided on the fourth track 34. The assembly station 28 is equipped with a first lifting assembly 4, which is used to lift the side mold onto the moving platform 1. Lifting the side mold onto the moving platform 1 via the first lifting assembly 4 facilitates subsequent operations.

[0043] A second hoisting assembly 41 is provided on one side of the lower rebar station 21. The second hoisting assembly 41 is used to hoist the lower rebar cage onto the bottom formwork and side formwork. A third hoisting assembly 42 is provided on one side of the inner formwork station 22. The third hoisting assembly 42 is used to hoist the inner formwork onto the lower rebar cage. A fourth hoisting assembly 43 is provided on one side of the upper rebar station 23. The fourth hoisting assembly 43 is used to hoist the upper rebar cage onto the inner formwork and lower rebar cage. The first hoisting assembly 41, the second hoisting assembly 42, and the fourth hoisting assembly 43 can all be mounted on a movable gantry crane.

[0044] The circular track 3 is buried in the ground, and the top surface of the circular track 3 is lower than the ground so that vehicles and other facilities can pass through the circular track 3.

[0045] The curing device 5 includes a curing trolley 51, a first curing pipe 52, and a second curing pipe 53. The curing trolley 51 can move along the length of the first track 31. The first curing pipe 52 is used for spray curing the outer side of the precast box girder, and the second curing pipe 53 is used for spray curing the inner side of the precast box girder. The curing device 5 has two sets, located on both sides of the second track 32, to simultaneously cure the precast box girder from both sides. Multiple first curing pipes 52 are arranged along the outer circumference of the precast box girder, and multiple second curing pipes 53 are arranged along the inner circumference of the precast box girder. The simultaneous curing of the inner and outer sides of the precast box girder is achieved through the first curing pipes 52 and the second curing pipes 53, improving curing efficiency.

[0046] The tensioning device 6 includes a gantry frame 61. The bottom of the gantry frame 61 is equipped with a movable component for adjusting its position, and the top of the gantry frame 61 is equipped with a position adjustment component 66. The movable end of the position adjustment component 66 is connected to a lifting member 68, which has two movable ends. Both movable ends of the lifting member 68 are connected to the same first jack 69. The two ends of the first jack 69 along its own axial direction are respectively connected to the two movable ends of the lifting member 68. The position of the gantry frame 61 is adjusted by the movable component, then the position of the first jack 69 on the horizontal plane is adjusted by the position adjustment component 66, and finally the position of the first jack 69 in the height direction is adjusted by the lifting member 68, simultaneously adjusting the levelness of the jack. This achieves rapid and precise installation, improving construction efficiency and accuracy.

[0047] Specifically, the position adjustment assembly 66 includes a lateral adjustment component and a longitudinal adjustment component. The lateral adjustment component is connected to the gantry 61, the movable end of the lateral adjustment component is connected to the longitudinal adjustment component, and the movable end of the longitudinal adjustment component is connected to the hoisting component 68.

[0048] More specifically, the lateral adjustment component includes a first guide rail 661, a rack 662, and a lateral sliding plate 663. Both the first guide rail 661 and the rack 662 are arranged laterally. The lateral sliding plate 663 is slidably connected to the first guide rail 661. A first motor 665 is fixedly connected to the lateral sliding plate 663. A gear 664 is fixedly connected to the output end of the first motor 665, and the gear 664 meshes with the rack 662. When the position of the first jack 69 needs to be adjusted laterally, the first motor 665 starts, driving the gear 664 to rotate. The gear 664 engages with the rack 662, driving the lateral sliding plate 663 to move laterally.

[0049] The longitudinal adjustment component includes a longitudinal adjustment plate 67, a second motor 671, a screw 673, a second guide rail 672, and a sliding block 674. The longitudinal adjustment plate 67 is fixedly connected to the transverse sliding plate 663. The second motor 671 and the second guide rail 672 are both fixedly connected to the longitudinal adjustment plate 67. The output end of the second motor 671 is coaxially fixed with the screw 673. The sliding block 674 is slidably connected to the second guide rail 672 and threadedly connected to the screw 673. When it is necessary to adjust the position of the first jack 69 longitudinally, the second motor 671 starts, driving the screw 673 to rotate and driving the sliding block 674 to move longitudinally.

[0050] In addition, the lifting component 68 includes a crane 681 and a lifting device 682. The crane 681 is fixedly connected to the sliding block 674. The end of the steel cable of the crane 681 away from the crane 681 is fixedly connected to the lifting device 682. The lifting device 682 has two lifting ropes, and the two lifting ropes on the lifting device 682 are connected to the first jack 69.

[0051] Specifically, two rotating drums 683 are rotatably connected to the lifting device 682. Each lifting rope is fixedly connected to the side wall of one rotating drum 683. One end of the rotating drum 683 extends out of the lifting device 682 and is connected to a ratchet 684. A pawl 685 is also rotatably connected to the lifting device 682. A torsion spring 686 is provided between the pawl 685 and the lifting device 682. The torsion spring 686 applies torque to the pawl 685 so that the pawl 685 abuts against the ratchet 684. A handwheel 687 is fixedly connected to the end of the rotating drum 683. When it is necessary to adjust the position of the first jack 69 in the height direction, the pawl 685 is released, and the handwheel 687 is turned to drive the rotating drum 683 to rotate, thereby lowering or raising the lifting rope, realizing the adjustment of the first jack 69 in the height direction. At the same time, the cooperation between the ratchet 684 and the pawl 685 can prevent the lifting rope from falling automatically.

[0052] The moving assembly includes two moving plates 62, each with four rotating wheels 63 rotatably connected to its bottom. A second jack 64 is fixedly connected to the moving plate 62. The movable end of the second jack 64 extends from top to bottom through the moving plate 62 and is connected to a support plate 65. When the movable end of the second jack 64 extends, the support plate 65 contacts the ground, causing the rotating wheels 63 to suspend in the air.

[0053] Working principle: The mobile platform 1 can be moved to the initial station 2, the lower rebar station 21, the inner formwork station 22, the upper rebar station 23, the pouring station 24, the demolding station 25, the curing station 26, and the tensioning station 27. Then, corresponding operations are performed at different stations to realize the prefabrication and tensioning of the precast box girder. This method only requires the transfer of the mobile platform 1, which improves the convenience of construction and makes fuller use of the site, thereby improving the production efficiency of precast box girders.

[0054] The pouring, setting, demolding, curing and tensioning of concrete all require a long time. Therefore, a set of stations on the first track 31 can correspond to several sets of stations on the second track 32, thereby making full use of the production efficiency of each station on the first track 31.

[0055] When the mobile platform 1 needs to move on the first track 31 or the third track 33, the movable end of the first telescopic member 111 extends, so that the first rotating wheel 63 enters the first track 31 or the third track 33, thereby enabling the mobile platform 1 to move on the first track 31 or the third track 33; when the mobile platform 1 needs to move on the second track 32 or the fourth track 34, the movable end of the second telescopic member 121 extends, the movable end of the first telescopic member 111 retracts, and the second rotating wheel 63 enters the second track 32 or the fourth track 34, so that the mobile platform 1 can move on the second track 32 or the fourth track 34, thereby enabling the mobile platform 1 to move cyclically on the loop track 3.

[0056] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An automated prefabrication and tensioning construction process for precast box girders, characterized in that, Includes the following steps: S1. The mobile platform (1) moves to the initial work station (2) and the bottom mold and side mold are installed on the mobile platform (1); S2. The mobile platform (1) moves to the lower rebar station (21) and hoists and installs the lower rebar cage on the bottom formwork and side formwork. S3. The mobile platform (1) moves to the inner formwork station (22) and hoists and installs the inner formwork on the lower steel cage; S4. The mobile platform (1) moves to the upper rebar station (23) and hoists and installs the upper rebar cage on the inner formwork and the lower rebar cage. S5. The mobile platform (1) moves to the pouring station (24), installs the end formwork, and pours concrete. S6. The mobile platform (1) is moved to the demolding station (25). After the concrete solidifies, the demolding is carried out. The side mold and inner mold are removed to obtain the precast box girder. The precast box girder is placed on the bottom mold. S7. The mobile platform (1) moves to the maintenance station (26) and the precast box girder is maintained by the maintenance device (5); S8. The mobile platform (1) moves to the tensioning station (27) and tensions the precast box girder through the tensioning device (6). After tensioning is completed, the precast box girder is transferred to the box girder storage area, and the mobile platform (1) moves to the initial station (2).

2. The automated prefabrication and tensioning construction process for precast box girders according to claim 1, characterized in that, The mobile platform (1) is installed on the circulating track (3), which includes a first track (31), a second track (32), a third track (33), and a fourth track (34) connected in sequence. The first track (31) passes through the initial station (2), the lower rebar station (21), the inner mold station (22), and the upper rebar station (23). The second track (32) passes through the pouring station (24), the demolding station (25), the curing station (26), and the tensioning station (27). The third track (33) passes through the tensioning station (27), and the fourth track (34) passes through the initial station (2).

3. The automated prefabrication and tensioning construction process for precast box girders according to claim 2, characterized in that, The second track (32) is set perpendicular to the first track (31). The second track (32), the pouring station (24), the demolding station (25), the curing station (26) and the tensioning station (27) are all set in multiple groups along the length direction of the first track (31). The first track (31) is connected to several second tracks (32).

4. The automated prefabrication and tensioning construction process for precast box girders according to claim 3, characterized in that, The bottom of the mobile platform (1) is provided with a first moving component (11) and a second moving component (12). The first moving component (11) is used to drive the mobile platform (1) to move on the first track (31) and the third track (33), and the second moving component (12) is used to drive the mobile platform (1) to move on the second track (32) and the fourth track (34).

5. The automated prefabrication and tensioning construction process for precast box girders as described in claim 4, characterized in that, The first moving component (11) includes a first telescopic member (111), a first frame (112) and a first moving wheel (113). The first telescopic member (111) is fixedly installed inside the moving platform (1). The movable end of the first telescopic member (111) is fixedly connected to the first frame (112). The first moving wheel (113) is rotatably connected to the first frame (112). The axis of the first moving wheel (113) is parallel to the length direction of the second track (32). The second moving component (12) includes a second telescopic member (121), a second frame (122), and a second moving wheel (123). The second telescopic member (121) is fixedly installed inside the moving platform (1). The movable end of the second telescopic member (121) is fixedly connected to the second frame (122). The second moving wheel (123) is rotatably connected to the second frame (122). The axis of the second moving wheel (123) is parallel to the length direction of the first track (31).

6. The automated prefabrication and tensioning construction process for precast box girders as described in claim 2, characterized in that, The fourth track (34) is provided with an assembly station (28), and the assembly station (28) is provided with a first hoisting assembly (4), which is used to hoist the side mold onto the mobile platform (1).

7. The automated prefabrication and tensioning construction process for precast box girders as described in claim 4, characterized in that, A second hoisting assembly (41) is provided on one side of the lower rebar station (21). The second hoisting assembly (41) is used to hoist the lower rebar cage onto the bottom formwork and side formwork. A third hoisting assembly (42) is provided on one side of the inner mold station (22), and the third hoisting assembly (42) is used to hoist the inner mold onto the lower steel cage; A fourth hoisting assembly (43) is provided on one side of the upper steel bar station (23), which is used to hoist the upper steel bar cage onto the inner formwork and the lower steel bar cage.

8. The automated prefabrication and tensioning construction process for precast box girders as described in claim 4, characterized in that, The circulating track (3) is buried in the ground, and the top surface of the circulating track (3) is lower than the ground.

9. The automated prefabrication and tensioning construction process for precast box girders as described in claim 8, characterized in that, The maintenance device (5) includes a maintenance trolley (51), a first maintenance pipe (52), and a second maintenance pipe (53). The maintenance trolley (51) can move along the length of the first track (31). The first maintenance pipe (52) is used for spraying and maintaining the outer side of the precast box girder, and the second maintenance pipe (53) is used for spraying and maintaining the inner side of the precast box girder.

10. The automated prefabrication and tensioning construction process for precast box girders as described in claim 3, characterized in that, The tensioning device (6) includes a gantry frame (61). The bottom of the gantry frame (61) is provided with a moving component for adjusting the position of the gantry frame (61). The top of the gantry frame (61) is provided with a position adjustment component (66). The movable end of the position adjustment component (66) is connected to a hoisting component. The hoisting component has two movable ends. The two movable ends of the hoisting component are connected to the same first jack (69). The two ends of the first jack (69) along its own axial direction are respectively connected to the two movable ends of the hoisting component.

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