Box girder construction device and construction method

Abstract

The box girder construction device comprises an inner mold, the inner mold comprises an upper mold plate, a lower mold plate and two side mold plates, the upper mold plate comprises a first movable plate, a second movable plate and a third movable plate, the second movable plate is connected with the first movable plate and the third movable plate in an up-down sliding and clamping mode, and the longitudinal section of the second movable plate is an isosceles trapezoid with the upper bottom facing upwards; the lower die plate comprises a fourth movable plate, a fifth movable plate and a sixth movable plate, the fifth movable plate is connected with the fourth movable plate and the sixth movable plate in an up-down sliding and clamping mode, and the longitudinal section of the fifth movable plate is an isosceles trapezoid with the upper bottom facing downwards; the second movable plate and the fifth movable plate are driven by a first driving mechanism to move in the same direction or in the back-to-back direction in the height direction of the box girder, the two side formworks are driven by a second driving mechanism to move in the same direction or in the back-to-back direction in the width direction of the box girder, and the first driving mechanism and the second driving mechanism are both arranged in the inner formwork. The method has the advantages of automatic demolding of the inner mold, simple operation, high construction efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the field of box girder construction, and more specifically, to a box girder construction device and a construction method. Background Art

[0002] Box girder is a type of beam in bridge engineering. It is hollow inside and has flanges on both sides of the upper part. It is named because it resembles a box. The box girder mold is one of the large-scale construction equipment required in the beam manufacturing process, which can provide sufficient support for the casting of the box girder. However, the inner mold of the existing box girder mold is generally assembled by bolting multiple small templates. After the box girder is cast, workers need to enter the inner mold to disassemble the inner mold into small pieces. The assembly and disassembly process of the inner mold is cumbersome and the construction efficiency is low. Summary of the invention

[0003] The object of the present invention is to provide a box girder construction device and a construction method to at least solve the above-mentioned problems.

[0004] In order to achieve the purpose and other advantages of the present invention, a box girder construction device is provided, comprising an outer mold, an inner mold and two end molds, wherein the outer mold, the inner mold and the two end molds together form a box girder prefabricated cavity; wherein the inner mold comprises an upper mold, a lower mold and two side molds, wherein the upper mold, the lower mold and the two side molds together form an inverted trapezoidal structure; wherein the upper mold comprises a first movable plate, a second movable plate and a third movable plate in sequence along the width direction of the box girder, wherein the second movable plate is respectively slidably engaged with the first movable plate and the third movable plate, and the longitudinal section of the second movable plate is an upper An isosceles trapezoid with the bottom facing upward; the lower template includes a fourth movable plate, a fifth movable plate and a sixth movable plate in sequence along the width direction of the box beam, the fifth movable plate is slidably engaged with the fourth movable plate and the sixth movable plate respectively, and the longitudinal section of the fifth movable plate is an isosceles trapezoid with the top and bottom facing downward; the second movable plate and the fifth movable plate are driven by a first driving mechanism to move toward or away from each other along the height direction of the box beam, and the two side templates are driven by a second driving mechanism to move toward or away from each other along the width direction of the box beam, and the first driving mechanism and the second driving mechanism are both arranged in the inner mold.

[0005] Preferably, the box girder construction device further includes a mounting column, which is arranged in the inner mold along the length direction of the box girder, one end of the mounting column is fixedly connected to one of the end molds, and the other end is plugged into the other end mold, and the first drive mechanism and the second drive mechanism are both arranged on the mounting column.

[0006] Preferably, the first driving mechanism includes a plurality of first double-headed telescopic columns, which are arranged at intervals along the length direction of the mounting column, each first double-headed telescopic column includes a first threaded sleeve and two first threaded columns arranged along the height direction of the box beam, the first threaded sleeve is inserted in a first mounting hole reserved on the mounting column and rotatably connected thereto, the threads at both ends of the inner wall of the first threaded sleeve have opposite rotation directions, a first worm gear is fixedly arranged on the outer side of the first threaded sleeve, one end of the two first threaded columns is respectively inserted in the first threaded sleeve and threadedly connected thereto, and the other end is respectively fixedly connected to the second movable plate and the fifth movable plate; a first driving rod is arranged along the length direction of the mounting column, the first driving rod is inserted in a second mounting hole reserved on the mounting column and rotatably connected thereto, the second mounting hole is arranged on one side of the first mounting hole and communicated therewith, a first helical tooth is arranged on the first driving rod opposite to the first mounting hole, and the first helical tooth is meshed with the first worm gear; a first motor is fixedly arranged on one of the end molds and is transmission-connected to the first driving rod.

[0007] Preferably, the second driving mechanism includes a plurality of second double-headed telescopic columns, which are arranged at intervals along the length direction of the mounting column, each second double-headed telescopic column includes a second threaded sleeve and two second threaded columns arranged along the width direction of the box beam, the second threaded sleeve is inserted in a third mounting hole reserved on the mounting column and rotatably connected thereto, the threads at both ends of the inner wall of the second threaded sleeve have opposite rotation directions, a second worm gear is fixedly arranged on the outer side of the second threaded sleeve, one end of the two second threaded columns are respectively inserted in the second threaded sleeve and threadedly connected thereto, and the other end is respectively fixedly connected to the two side templates; a second driving rod is arranged along the length direction of the mounting column, the second driving rod is inserted in a fourth mounting hole reserved on the mounting column and rotatably connected thereto, the fourth mounting hole is arranged on one side of the third mounting hole and communicated therewith, a second helical tooth is arranged on the second driving rod opposite to the third mounting hole, and the second helical tooth is meshed with the second worm gear; a second motor is fixedly arranged on one of the end templates and drivingly connected to the second driving rod.

[0008] Preferably, the first driving mechanism also includes an upper template guide assembly and a lower template guide assembly, the upper template guide assembly and the lower template guide assembly have the same structure, including multiple pairs of guide plates, which correspond one-to-one to the multiple first double-headed telescopic columns, each pair of guide plates are symmetrically fixed on both sides of the mounting columns, each guide plate is provided with a guide slide groove along the width of the box beam, multiple pairs of connecting columns, which correspond one-to-one to the multiple pairs of guide plates, each connecting column is telescopically arranged along the height direction of the box beam, and one end of each connecting column is slidably engaged with the guide slide groove, and the other end is fixedly connected to the corresponding first movable plate, the third movable plate, the fourth movable plate or the sixth movable plate; wherein, the lower end of the second movable plate and the upper end of the fifth movable plate are provided with a clearance hole for the connecting column to be embedded at a position opposite to the connecting column.

[0009] Preferably, the box girder construction device further includes a support seat, which is placed on the ground and arranged along the length direction of the box girder, the width of the support seat is greater than the maximum width of the outer mold; a base, which is fixed on the support seat and located below the inner mold, and the two sides of the base are abutted against the bottom of the outer mold; two support assemblies, which are symmetrically arranged on both sides of the outer mold, each support assembly includes a plurality of support columns, which are arranged at intervals along the length direction of the box girder, each support column is arranged along the height direction of the box girder, the upper end of each support column is slidably connected to the top of the outer mold along the width direction of the box girder, and the lower end is fixedly connected to a support bottom column, the bottom of the support bottom column is fixedly provided with a plurality of first rollers along its length direction, and a plurality of groups of linear drives, which correspond one-to-one to the plurality of support columns, each group of linear drives includes a plurality of linear drives arranged at intervals along the height direction of the support columns, and each linear drive is arranged along the width direction of the box girder and fixedly connected to the outer mold and the support columns.

[0010] Preferably, a plurality of connecting waist holes are provided at intervals on both sides of the end mold along its height direction, each connecting waist hole is arranged along the width direction of the box beam, a pull rod is inserted in each connecting waist hole, one end of the pull rod is fixedly connected to the adjacent supporting column, and the other end passes through the connecting waist hole and is detachably connected to a connecting plate, the connecting plate is in sliding contact with the end mold, and a plurality of second rollers are fixedly provided at intervals on the bottom of the end mold along its length direction.

[0011] Preferably, the top of the support seat is provided with a first roller groove and a second roller groove respectively cooperating with the first roller and the second roller.

[0012] The present invention also provides a box beam construction method, which uses the above-mentioned box beam construction device to perform prefabrication construction of the box beam.

[0013] The present invention has at least the following beneficial effects: The present invention improves the structure of the inner mold, and sets the inner mold to include a first movable plate, a second movable plate, a third movable plate, a fourth movable plate, a fifth movable plate, a sixth movable plate and two side molds. The first movable plate, the second movable plate and the third movable plate constitute an upper mold, and the second movable plate is slidably engaged with the first movable plate and the third movable plate up and down, the fourth movable plate, the fifth movable plate and the sixth movable plate constitute a lower mold, and the fifth movable plate is movably engaged with the fourth movable plate and the sixth movable plate up and down, and a first driving mechanism and a second driving mechanism are set in the inner mold. The second movable plate, the fifth movable plate and the two side molds are driven by the first driving mechanism and the second driving mechanism to realize the expansion and contraction of the inner mold, so that after the box beam is cast, the inner mold can be automatically demoulded by controlling the actions of the first driving mechanism and the second driving mechanism, and the operation is simple and the construction efficiency is high.

[0014] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of a box girder construction device according to an embodiment of the present invention before the end formwork is installed; Figure 2 It is a schematic diagram of the overall structure of a box girder construction device according to one embodiment of the present invention after the end formwork is installed; Figure 3 is a schematic diagram of the inner mold structure after stretching according to an embodiment of the present invention; Figure 4 yes Figure 3 A schematic diagram of the cross-sectional structure of the middle part A; Figure 5 is a schematic diagram of the inner mold structure before stretching according to an embodiment of the present invention; Figure 6 is a schematic diagram of the connection structure between the first double-headed telescopic column and the first driving rod according to an embodiment of the present invention; Figure 7 It is a schematic diagram of the connection structure between the second double-headed telescopic column and the second driving rod according to an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with embodiments and drawings so that those skilled in the art can implement the invention with reference to the description.

[0017] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0018] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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.

[0019] like Figure 1~Figure 5 As shown, an embodiment of the present invention provides a box girder construction device, comprising an outer mold 1, an inner mold 2 and two end molds 3, wherein the outer mold 1, the inner mold 2 and the two end molds 3 together form a box girder prefabricated cavity; wherein the inner mold 2 comprises an upper mold, a lower mold and two side molds 201, wherein the upper mold, the lower mold and the two side molds 201 together form an inverted trapezoidal structure; the upper mold comprises a first movable plate 202, a second movable plate 203 and a third movable plate 204 in sequence along the width direction of the box girder, wherein the second movable plate 203 is respectively slidably engaged with the first movable plate 202 and the third movable plate 204 up and down, and the longitudinal section of the second movable plate 203 is an upper bottom facing The isosceles trapezoid on the upper surface; the lower template includes a fourth movable plate 205, a fifth movable plate 206 and a sixth movable plate 207 in sequence along the width direction of the box beam, the fifth movable plate 206 is slidably engaged with the fourth movable plate 205 and the sixth movable plate 207 respectively, and the longitudinal section of the fifth movable plate 206 is an isosceles trapezoid with the upper bottom facing downward; the second movable plate 203 and the fifth movable plate 206 are driven by the first driving mechanism to move toward or away from each other along the height direction of the box beam, and the two side templates 201 are driven by the second driving mechanism to move toward or away from each other along the width direction of the box beam, and the first driving mechanism and the second driving mechanism are both arranged in the inner mold 2.

[0020] In this embodiment, the box girder construction device includes an outer mold 1, an inner mold 2 and two end molds 3. The outer mold 1, the inner mold 2 and the two end molds 3 are all steel molds. The outer mold 1, the inner mold 2 and the two end molds 3 together form a box girder prefabricated cavity. By pouring concrete into the box girder prefabricated cavity and curing and forming, a box girder is formed. The outer mold 1 and the two end molds 3 can adopt the existing structure, and only the structure of the inner mold 2 is improved. Specifically, the inner mold 2 includes an upper mold, a lower mold and two side molds 201. The upper mold, the lower mold and the two side molds 201 together form an inverted trapezoidal structure; the upper mold includes a first movable plate 202, a second movable plate 203 and a third movable plate 204 in sequence along the width direction of the box girder. The longitudinal section of the second movable plate 203 is an isosceles trapezoid with the upper bottom facing upward. T-shaped sliders 209 are fixed on the upper ends of the two side walls of the second movable plate 203. The shapes of the first movable plate 202 and the third movable plate 204 are adapted to the second movable plate 203, and the third movable plate 204 are provided with a T-shaped slider 209 ... third movable plate 204 is provided with a T-shaped slider 209. The third movable plate 204 is provided with a T-shaped slider 209. The third movable plate 204 is provided with a T-shaped slider 209. The third movable plate 204 is provided with a T-shaped slider 209. The third movable plate 204 is provided with a T The side walls of the first movable plate 202 and the third movable plate 204 close to the second movable plate 203 are provided with T-shaped grooves 208, and the T-shaped grooves 208 on the upper template are slidably engaged with the T-shaped sliders 209 along the side walls of the second movable plate 202; the lower template includes the fourth movable plate 205, the fifth movable plate 206 and the sixth movable plate 207 in sequence along the width direction of the box beam, the structure of the fifth movable plate 206 is the same as that of the second movable plate 203, but the upper bottom is downward, that is, the fifth movable plate 206 is arranged opposite to the second movable plate 203, and the fifth movable plate 206 is arranged opposite to the second movable plate 203. The lower ends of the two side walls of the fifth movable plate 206 are fixed with T-shaped sliders 209, the shapes of the fourth movable plate 205 and the sixth movable plate 207 are adapted to the fifth movable plate 206, and the side walls of the fourth movable plate 205 and the sixth movable plate 207 close to the fifth movable plate 206 are provided with T-shaped grooves 208, and the T-shaped grooves 208 on the lower mold plate are slidably engaged with the T-shaped sliders 209 along the side walls of the fifth movable plate 206; the inner mold is provided with a first driving mechanism and a second driving mechanism, and the first driving mechanism and the second driving mechanism are alternately arranged, including But it is not limited to cylinders and electric telescopic rods. The second movable plate 203 and the fifth movable plate 206 are connected to the first driving mechanism, and are driven by the first driving mechanism to move toward or away from each other along the height direction of the box beam. The first driving mechanism cooperates with the T-shaped slide groove 208 and the T-shaped slider 209 to achieve the expansion and contraction of the upper template and the lower template in the height and width directions of the box beam. The two side templates 201 are connected to the second driving mechanism, and are driven by the second driving mechanism to move toward or away from each other along the width direction of the box beam, thereby achieving the expansion and contraction of the two side templates 201 in the width direction of the box beam.

[0021] When the inner mold is used, the two side mold plates 201 are first driven by the second driving mechanism to move in opposite directions, so that the two side mold plates 201 are unfolded, and then the second movable plate 203 and the fifth movable plate 206 are driven by the first driving mechanism to move in opposite directions. While the second movable plate 203 and the fifth movable plate 206 move in opposite directions, the first movable plate 202 and the third movable plate 204, the fourth movable plate 205 and the sixth movable plate 207 are pushed to the sides by the T-shaped slider 209 to unfold, so that the inner mold can be formed as shown in FIG. Figure 3 After the box beam is poured and reaches the preset strength, the second movable plate 203 and the fifth movable plate 206 are driven to move toward each other by the first driving mechanism. While the second movable plate 203 and the fifth movable plate 206 move toward each other, the first movable plate 202 and the third movable plate 204, the fourth movable plate 205 and the sixth movable plate 207 are driven to retract toward the middle by the T-shaped slider 209. Then, the two side templates 201 are driven to move toward each other by the second driving mechanism, so that the two side templates 201 are retracted, and the inner mold is formed as shown. Figure 5 In the contracted state shown, the upper formwork, the lower formwork and the two side formworks 201 of the inner formwork are separated from the precast concrete surface, and the inner formwork can be taken out of the box beam by traction by a traction mechanism.

[0022] The present invention improves the structure of the inner mold, and sets the inner mold to include a first movable plate, a second movable plate, a third movable plate, a fourth movable plate, a fifth movable plate, a sixth movable plate and two side molds. The first movable plate, the second movable plate and the third movable plate constitute an upper mold, and the second movable plate is slidably engaged with the first movable plate and the third movable plate up and down, the fourth movable plate, the fifth movable plate and the sixth movable plate constitute a lower mold, and the fifth movable plate is movably engaged with the fourth movable plate and the sixth movable plate up and down, and a first driving mechanism and a second driving mechanism are set in the inner mold. The second movable plate, the fifth movable plate and the two side molds are driven by the first driving mechanism and the second driving mechanism to realize the expansion and contraction of the inner mold, so that after the box beam is cast, the inner mold can be automatically demoulded by controlling the actions of the first driving mechanism and the second driving mechanism, and the operation is simple and the construction efficiency is high.

[0023] In another embodiment, if Figure 1 , Figure 3 , Figure 5 As shown, the box girder construction device also includes a mounting column 4, which is arranged in the inner mold 2 along the length direction of the box girder, one end of the mounting column 4 is fixedly connected to one of the end molds 3, and the other end is plugged into the other end mold 3, and the first driving mechanism and the second driving mechanism are both arranged on the mounting column 4.

[0024] In this embodiment, the mounting column 4 is disposed in the inner mold 2 and fixed in the inner mold 2 through the two end molds 3 to provide support for the first drive mechanism and the second drive mechanism. Preferably, the mounting column 4 is disposed in the middle of the inner mold 2.

[0025] In another embodiment, if Figure 6 As shown, the first driving mechanism includes a plurality of first double-headed telescopic columns 5, which are arranged at intervals along the length direction of the mounting column 4, and each first double-headed telescopic column 5 includes a first threaded sleeve and two first threaded columns arranged along the height direction of the box beam, the first threaded sleeve is inserted into a first mounting hole 401 reserved on the mounting column 4 and is rotatably connected thereto, the threads at both ends of the inner wall of the first threaded sleeve have opposite rotation directions, a first worm gear 6 is fixedly arranged on the outer side of the first threaded sleeve, one end of the two first threaded columns are respectively inserted into the first threaded sleeve and are threadedly connected thereto, and the other end is respectively connected to the first threaded sleeve. The second movable plate 203 and the fifth movable plate 206 are fixedly connected; the first driving rod 7 is arranged along the length direction of the mounting column 4, the first driving rod 7 is inserted into the second mounting hole 402 reserved on the mounting column 4 and is rotatably connected thereto, the second mounting hole 402 is arranged on one side of the first mounting hole 401 and is connected thereto, a first helical tooth 8 is provided on the first driving rod 7 at a position opposite to the first mounting hole 401, and the first helical tooth 8 is meshed with the first worm gear 6; a first motor 9 is fixedly arranged on one of the end molds 3 and is transmission-connected to the first driving rod 7.

[0026] In this embodiment, Figure 6 As shown, both ends of the first threaded sleeve are rotatably connected to the first mounting hole 401 through bearings respectively, and the first worm gear 6 is arranged between the two bearings; the first driving rod 7 is also rotatably connected to the second mounting hole 402 through a bearing. Since the length of the first driving rod 7 is relatively long, multiple bearings can be arranged at intervals along the length direction of the first driving rod 7 to be rotatably connected to the second mounting hole 402, and the first spiral tooth 8 is arranged between two adjacent bearings and meshes with the first worm gear; the first motor 9 is fixed on one of the end molds and is transmission-connected to the first driving rod 7 to provide a power source for the first driving rod 7. The first driving rod 7 rotates to drive multiple first motors arranged on the first driving rod 7. A spiral tooth 8 rotates synchronously, multiple first spiral teeth 8 drive multiple first worm gears 6 to rotate synchronously, multiple first worm gears 6 drive multiple first threaded sleeves to rotate synchronously, the first threaded sleeve drives the two first threaded columns connected thereto to move toward or away from each other, the two first threaded columns drive the second movable plate 203 and the fifth movable plate 206 connected thereto to move toward or away from each other, the second movable plate 203 and the fifth movable plate 206 then drive the first movable plate 202 and the third movable plate 204, the fourth movable plate 205 and the sixth movable plate 206 connected thereto to move, thereby driving the upper formwork and the lower formwork to extend and retract in the height and width directions of the box beam.

[0027] In another embodiment, if Figure 7 As shown, the second driving mechanism includes a plurality of second double-headed telescopic columns 10, which are arranged at intervals along the length direction of the mounting column 4, and each second double-headed telescopic column 10 includes a second threaded sleeve and two second threaded columns arranged along the width direction of the box beam, the second threaded sleeve is inserted into a third mounting hole 403 reserved on the mounting column 4 and rotatably connected thereto, the threads at both ends of the inner wall of the second threaded sleeve have opposite rotation directions, a second worm gear 11 is fixedly arranged on the outer side of the second threaded sleeve, one end of the two second threaded columns are respectively inserted into the second threaded sleeve and threadedly connected thereto, and the other end is respectively connected to the second threaded sleeve. The two side molds 201 are fixedly connected; a second drive rod 12 is arranged along the length direction of the mounting column 4, the second drive rod 12 is inserted into a fourth mounting hole 404 reserved on the mounting column 4 and is rotatably connected thereto, the fourth mounting hole 404 is arranged on one side of the third mounting hole 403 and is connected thereto, a second helical tooth 13 is provided on the second drive rod 12 at a position opposite to the third mounting hole 403, the second helical tooth 13 is meshed with the second worm gear 11; a second motor 14 is fixedly arranged on one of the end molds 3 and is transmission-connected to the second drive rod 12.

[0028] In this embodiment, Figure 7 As shown, both ends of the second threaded sleeve are rotatably connected to the third mounting hole 403 through bearings respectively, and the second worm gear 11 is arranged between the two bearings; the second drive rod 12 is also rotatably connected to the fourth mounting hole 404 through bearings. Since the second drive rod 12 is relatively long, multiple bearings can be arranged at intervals along the length direction of the second drive rod 12 to be rotatably connected to the fourth mounting hole 404, and the second helical teeth 13 are arranged between two adjacent bearings and mesh with the second worm gear 11; the second motor 14 is fixed on one of the end molds and is transmission-connected to the second drive rod 12 to provide a power source for the second drive rod 12. The second drive rod 12 rotates, driving the multiple second helical teeth 13 arranged on the second drive rod 12 to rotate synchronously, the multiple second helical teeth 13 drive the multiple second worm gears 11 to rotate synchronously, and the multiple second worm gears 11 drive the multiple second threaded sleeves to rotate synchronously, and the second threaded sleeve drives the two second threaded columns connected thereto to move toward or away from each other, and the two second threaded columns drive the two side templates 201 connected thereto to move toward or away from each other, that is, the two side templates 201 are driven to extend and retract in the width direction of the box beam.

[0029] In another embodiment, if Figure 1 , Figure 3 and Figure 5As shown, the first driving mechanism also includes an upper template guide assembly and a lower template guide assembly, and the upper template guide assembly and the lower template guide assembly have the same structure, including multiple pairs of guide plates 15, which correspond one-to-one to the multiple first double-head telescopic columns 5, and each pair of guide plates 15 is symmetrically fixed on both sides of the mounting column 4, and each guide plate 15 is provided with a guide slide groove along the width of the box beam, and multiple pairs of connecting columns 16, which correspond one-to-one to the multiple pairs of guide plates 15, and each connecting column 16 is telescopically arranged along the height direction of the box beam, and one end of each connecting column 16 is slidably engaged with the guide slide groove, and the other end is fixedly connected to the corresponding first movable plate 202, the third movable plate 204, the fourth movable plate 205 or the sixth movable plate 207; wherein, the lower end of the second movable plate 203 and the upper end of the fifth movable plate 206 are opposite to the connecting column 16 and are provided with a clearance hole for the connecting column 16 to be embedded.

[0030] In this embodiment, the connecting column 16 can be set as a telescopic column, or a spring can be set at one end of the connecting column 16, and fixedly connected to the first movable plate 202, the third movable plate 204, the fourth movable plate 205 or the sixth movable plate 207 through the spring, so that the connecting column 16 can be slightly telescopic along the height direction of the box beam to adapt to the telescopic changes of the upper template and the lower template in the height direction of the box beam. By setting the upper template guide component and the lower template guide component, while the first threaded column drives the second movable plate and the fifth movable plate to move, the movement of the first movable plate, the third movable plate, the fourth movable plate and the sixth movable plate is guided and limited, ensuring that the first movable plate, the third movable plate, the fourth movable plate and the sixth movable plate remain horizontal during the movement, so that the inner mold can be smoothly contracted and expanded.

[0031] Furthermore, in order to improve the stability of the guide plate 15 , a reinforcing rib 17 is provided between the mounting column 4 and the guide plate 15 .

[0032] In another embodiment, if Figure 1 and Figure 2As shown, the box beam construction device also includes a support seat 18, which is placed on the ground and arranged along the length direction of the box beam, and the width of the support seat 18 is greater than the maximum width of the outer mold 1; a base 19, which is fixed on the support seat 18 and located below the inner mold 2, and the two sides of the base 19 are abutted against the bottom of the outer mold 1; two support assemblies, which are symmetrically arranged on both sides of the outer mold 1, each support assembly includes a plurality of support columns 20, which are arranged at intervals along the length direction of the box beam, and each support column 20 is arranged along the height direction of the box beam. The upper end of each supporting column 20 is slidably connected to the top of the outer mold 1 along the width direction of the box beam, and the lower end is fixedly connected to a supporting bottom column 21. The bottom of the supporting bottom column 21 is fixedly provided with a plurality of first rollers 22 along its length direction, and a plurality of groups of linear drives 23, which correspond one to one with the plurality of supporting columns 20. Each group of linear drives 23 includes a plurality of linear drives 23 arranged at intervals along the height direction of the supporting columns 20. Each linear drive 23 is arranged along the width direction of the box beam and is fixedly connected to the outer mold 1 and the supporting columns 20.

[0033] In this embodiment, the outer mold 1 is supported and fixed on the outer side of the inner mold by a plurality of support columns 20, a support bottom column 21 and a plurality of groups of linear actuators 23. When the outer mold 1 is in use, the linear actuator 23 can be controlled to extend so that the linear actuator 23 drives the outer mold 1 to move toward the side close to the base 19 until the bottom of the outer mold abuts against the two sides of the base 19. After the box beam is cast and reaches a preset strength, the linear actuator 23 is controlled to contract so that the linear actuator 23 drives the outer mold 1 to move toward the side away from the base 19 until the outer mold 1 is separated from the precast concrete surface and reset. Then, the outer mold 1 can be pulled away from the cast box beam by the traction mechanism and the first roller 22. Here, the linear actuator includes but is not limited to a cylinder and an electric telescopic rod.

[0034] In another embodiment, if Figure 1 and Figure 2 As shown, a plurality of connecting waist holes 24 are provided at intervals on both sides of the end mold 3 along its height direction, and each connecting waist hole 24 is arranged along the width direction of the box beam. A pull rod 25 is inserted in each connecting waist hole 24, and one end of the pull rod 25 is fixedly connected to the adjacent supporting column 20, and the other end passes through the connecting waist hole 24 and is detachably connected to a connecting plate 29. The connecting plate 25 is in sliding contact with the end mold 3, and a plurality of second rollers 26 are fixedly provided at the bottom of the end mold 3 along its length direction.

[0035] In this embodiment, a connecting waist hole 24 is provided to facilitate the connection of the supporting column 20 with the end mold 3 through the pull rod 25 and the connecting plate 29, so that the outer mold 1, the supporting column 20 and the end mold 3 are connected to form a whole. The end mold 3 fixedly connected to the inner mold or the connecting plate 29 thereon is pulled by the traction mechanism, and in conjunction with the first roller 22 and the second roller 26, the end mold 3, the inner mold and the outer mold 1 can be driven to move synchronously, and the whole is away from the cast box beam.

[0036] In another embodiment, if Figure 1 and Figure 2 As shown, the top of the support seat 18 is provided with a first roller groove 27 and a second roller groove 28 which respectively cooperate with the first roller 22 and the second roller 26.

[0037] In this embodiment, the movement of the first roller 22 and the second roller 26 is limited by the first roller groove 27 and the second roller groove 28, so that the first roller 22 and the second roller 26 can only move along the first roller groove 27 and the second roller groove 28, ensuring that the relative position relationship between the templates does not change after the box girder template is towed and moved, thereby avoiding leakage of slurry during pouring.

[0038] The present invention also provides a box girder construction method, which uses the above-mentioned box girder construction device to perform prefabrication construction of the box girder, comprising: Step 1: fix the outer mold 1 on the support seat 18 through the support assembly; Step 2: Control the linear drive 23 on the support assembly to extend, so that the linear drive 23 drives the outer mold 1 to move toward the side close to the base 19 until the bottom of the outer mold abuts against both sides of the base 19; Step 3: hoist the bound box girder steel bar skeleton into the outer mold 1; Step 4: Controlling the inner mold to unfold by the first driving mechanism and the second driving mechanism; Step 5: hoist the inner mold and the end mold 3 fixedly connected to the inner mold, and place the inner mold at a preset position of the box girder reinforcement skeleton; Step 6: plug and fix the other end of the inner mold with the remaining end mold 3, and connect and fix the two end molds 3 with the outer mold 1, so that the outer mold 1, the inner mold and the two end molds 3 are surrounded to form a box beam prefabricated cavity; Step 7: pouring concrete into the precast cavity of the box beam; Step 8: After the concrete reaches a preset strength, the outer mold is controlled by the linear drive 23 to move to a side away from the base 19 until the outer mold 1 is separated from the precast concrete surface and reset, and the inner mold is controlled to shrink by the first drive mechanism and the second drive mechanism to separate the inner mold from the precast concrete surface; Step nine, separate the outer mold 1 from the remaining end mold 3, pull the end mold 3 fixedly connected to the inner mold or the connecting plate 29 thereon by the traction mechanism, and cooperate with the first roller 22 and the second roller 26 to make the end mold 3 fixedly connected to the inner mold, the inner mold and the outer mold 1 move synchronously until they are away from the cast box beam as a whole, then separate the end mold 3 fixedly connected to the inner mold from the outer mold 1, and hoist the inner mold and the end mold 3 fixedly connected to the inner mold as a whole away from the outer mold 1; Step 10. Repeat steps 2 to 9 to carry out prefabrication construction of the next section of the box girder.

[0039] The number of equipment and processing scale described here are used to simplify the description of the present invention. The application, modification and variation of the box girder construction device and construction method of the present invention will be obvious to those skilled in the art.

[0040] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A box girder construction device, characterized in that: It includes an outer mold, an inner mold and two end molds, and the outer mold, the inner mold and the two end molds together form a box beam prefabrication cavity; wherein, The inner mold comprises an upper mold, a lower mold and two side molds, and the upper mold, the lower mold and the two side molds are combined to form an inverted trapezoidal structure; the upper mold comprises a first movable plate, a second movable plate and a third movable plate in sequence along the width direction of the box beam, the second movable plate is respectively slidably engaged with the first movable plate and the third movable plate, and the longitudinal section of the second movable plate is an isosceles trapezoid with the upper bottom facing upward; the lower mold comprises a fourth movable plate, a fifth movable plate and a sixth movable plate in sequence along the width direction of the box beam, the fifth movable plate is respectively slidably engaged with the fourth movable plate and the sixth movable plate, and the longitudinal section of the fifth movable plate is an isosceles trapezoid with the upper bottom facing downward; the second movable plate and the fifth movable plate are driven by the first driving mechanism to move toward or away from each other along the height direction of the box beam, and the two side molds are driven by the second driving mechanism to move toward or away from each other along the width direction of the box beam; a mounting column is provided in the inner mold along the length direction of the box beam, one end of the mounting column is fixedly connected to one of the end molds, and the other end is plugged with the other end mold, and the first driving mechanism and the second driving mechanism are both arranged on the mounting column.

2. The box girder construction device according to claim 1, characterized in that: The first driving mechanism comprises a plurality of first double-headed telescopic columns, which are arranged at intervals along the length direction of the mounting column, each first double-headed telescopic column comprises a first threaded sleeve and two first threaded columns arranged along the height direction of the box beam, the first threaded sleeve is inserted into a first mounting hole reserved on the mounting column and is rotatably connected thereto, the threads at both ends of the inner wall of the first threaded sleeve have opposite rotation directions, a first worm gear is fixedly arranged on the outer side of the first threaded sleeve, one end of the two first threaded columns are respectively inserted into the first threaded sleeve and are threadedly connected thereto, and the other end is respectively fixedly connected to the second movable plate and the fifth movable plate; a first driving rod is arranged along the length direction of the mounting column, the first driving rod is inserted into a second mounting hole reserved on the mounting column and is rotatably connected thereto, the second mounting hole is arranged on one side of the first mounting hole and is connected thereto, a first helical tooth is arranged on the first driving rod opposite to the first mounting hole, and the first helical tooth is meshed with the first worm gear; a first motor is fixedly arranged on one of the end molds and is transmission-connected to the first driving rod.

3. The box girder construction device according to claim 2, characterized in that: The second driving mechanism includes a plurality of second double-headed telescopic columns, which are arranged at intervals along the length direction of the mounting column, each second double-headed telescopic column includes a second threaded sleeve and two second threaded columns arranged along the width direction of the box beam, the second threaded sleeve is inserted in a third mounting hole reserved on the mounting column and rotatably connected thereto, the threads at both ends of the inner wall of the second threaded sleeve have opposite rotation directions, a second worm gear is fixedly arranged on the outer side of the second threaded sleeve, one end of the two second threaded columns are respectively inserted in the second threaded sleeve and threadedly connected thereto, and the other end is respectively fixedly connected to the two side templates; a second driving rod is arranged along the length direction of the mounting column, the second driving rod is inserted in a fourth mounting hole reserved on the mounting column and rotatably connected thereto, the fourth mounting hole is arranged on one side of the third mounting hole and communicated therewith, a second helical tooth is arranged on the second driving rod opposite to the third mounting hole, and the second helical tooth is meshed with the second worm gear; a second motor is fixedly arranged on one of the end templates and is transmission-connected to the second driving rod.

4. The box girder construction device according to claim 3, characterized in that: The first driving mechanism also includes an upper template guide assembly and a lower template guide assembly, and the upper template guide assembly and the lower template guide assembly have the same structure, including multiple pairs of guide plates, which correspond one-to-one to the multiple first double-headed telescopic columns, and each pair of guide plates are symmetrically fixed on both sides of the mounting column, and each guide plate is provided with a guide slide groove along the width of the box beam, and multiple pairs of connecting columns, which correspond one-to-one to the multiple pairs of guide plates, and each connecting column is telescopically arranged along the height direction of the box beam, and one end of each connecting column is slidably engaged with the guide slide groove, and the other end is fixedly connected to the corresponding first movable plate, the third movable plate, the fourth movable plate or the sixth movable plate; wherein, the lower end of the second movable plate and the upper end of the fifth movable plate are opposite to the connecting column and are provided with a clearance hole for the connecting column to be embedded.

5. The box girder construction device according to claim 4, characterized in that: It also includes a support seat, which is placed on the ground and arranged along the length direction of the box beam, and the width of the support seat is greater than the maximum width of the outer mold; a base, which is fixed on the support seat and located below the inner mold, and the two sides of the base are abutted against the bottom of the outer mold; two support components, which are symmetrically arranged on both sides of the outer mold, each support component includes a plurality of support columns, which are arranged at intervals along the length direction of the box beam, and each support column is arranged along the height direction of the box beam. The upper end of each support column is slidably connected to the top of the outer mold along the width direction of the box beam, and the lower end is fixedly connected to a support bottom column, and the bottom of the support bottom column is fixedly provided with a plurality of first rollers along the length direction thereof, and a plurality of groups of linear drives, which correspond one to one with the plurality of support columns, and each group of linear drives includes a plurality of linear drives arranged at intervals along the height direction of the support columns, and each linear drive is arranged along the width direction of the box beam and fixedly connected to the outer mold and the support columns.

6. The box girder construction device according to claim 5, characterized in that: A plurality of connecting waist holes are provided at intervals on both sides of the end mold along its height direction, each connecting waist hole is arranged along the width direction of the box beam, and a pull rod is inserted in each connecting waist hole. One end of the pull rod is fixedly connected to the adjacent supporting column, and the other end passes through the connecting waist hole and is detachably connected to a connecting plate. The connecting plate is in sliding contact with the end mold, and a plurality of second rollers are fixedly provided at intervals along its length direction on the bottom of the end mold.

7. The box girder construction device according to claim 6, characterized in that: The top of the support seat is provided with a first roller groove and a second roller groove respectively matched with the first roller and the second roller.

8. A box girder construction method, characterized in that: The box girder construction device as described in claim 7 is used to carry out prefabrication construction of the box girder.

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