A box girder form for bridge construction and method of use thereof

Abstract

This invention discloses a box girder formwork for bridge construction and its application method, belonging to the field of bridge construction technology. It includes a formwork body and multiple support frames located on both sides of the formwork body. A transfer cart is slidably mounted on the formwork body, and the transfer cart has an installation groove. A pair of L-shaped plates are slidably connected within the installation groove. The transfer cart is equipped with a drive unit that acts on the two L-shaped plates. Installation plates are connected to the L-shaped plates via connecting components. The two installation plates have cooperating cleaning and painting units on their sides near the formwork body. This invention, by using a mobile transfer cart, achieves automatic grinding and painting of the inner side of the box girder formwork body, improving the grinding efficiency of the box girder formwork structure while ensuring the quality of painting and grinding, thus maximizing construction efficiency.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, specifically relating to a box girder formwork for bridge construction and its usage method. Background Technology

[0002] Reinforced concrete box girders are divided into precast box girders and cast-in-place box girders. Precast box girders, manufactured on an independent site, can be erected after the substructure is completed using a bridge erecting machine, accelerating the project and saving time. Cast-in-place box girders are mostly used for large continuous bridges. Commonly categorized by material, there are two main types: prestressed reinforced concrete box girders and steel box girders. Prestressed reinforced concrete box girders are constructed on-site, and in addition to longitudinal prestressing, some also have transverse prestressing. Steel box girders are generally fabricated in a factory and then transported to the site for installation; some are entirely steel structures, while others have a reinforced concrete pavement layer.

[0003] Bridge construction requires a large amount of formwork. Due to its frequent use, steel structure formwork is commonly used in bridge erection. Lifting equipment often employs box girder structures, leading to the term "box girder formwork" becoming a general term for bridge erection machine products. During the processing of box girders using this formwork structure, the inner side of the formwork needs to be ground and oiled. This grinding and oiling process requires manual labor using wheel-type grinders and oil rollers. Manual operation is inefficient and makes it difficult to control the quality of grinding and oiling, hindering the processing of box girders using the formwork structure. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the inventors derived the technical solution of this invention through practice and summarization. This invention discloses a box girder formwork for bridge construction, including a formwork body and multiple support frames located on both sides of the formwork body. A transfer cart is slidably arranged on the formwork body, and an installation groove is opened on the transfer cart. A pair of L-shaped plates are slidably connected in the installation groove. The transfer cart is provided with a drive unit that acts on the two L-shaped plates. An installation plate is connected to the L-shaped plate through a connecting component. A cleaning unit and an oiling unit that cooperate with each other are provided on the side of the two installation plates near the formwork body.

[0005] Preferably, the cleaning unit includes a first mounting frame, a rotating shaft rotatably connected to the first mounting frame, a grinding roller sleeved on the rotating shaft, and a first motor for driving the rotating shaft.

[0006] Preferably, the brushing unit includes a second mounting bracket, a water pipe mounted on the second mounting bracket, a plurality of nozzles evenly distributed along the length of the water pipe, and a connecting pipe disposed at the top of the water pipe, wherein a water extrusion assembly is provided inside the water pipe.

[0007] Preferably, the water extrusion assembly includes two one-way valves, a fixed pipe located on one side of the upper end of the water pipe, and a piston plate slidably installed inside the fixed pipe. The conduction direction of the two one-way valves is from one end of the connecting pipe to the water outlet end of each nozzle. A reciprocating extrusion member is connected to the end of the piston plate away from the water pipe.

[0008] Preferably, the reciprocating extrusion component includes an extrusion rod connected to a piston plate, a first spring sleeved on the extrusion rod, a fixing frame fixedly connected to a mounting plate, and a mounting shaft located at the upper end of the fixing frame. A turntable is sleeved on the mounting shaft, and multiple protrusions are arranged in a circular array on the turntable. The protrusions abut against the end of the extrusion rod. The two ends of the first spring are respectively connected to the inner walls of the piston plate and the fixing tube. A transmission device is provided between the rotating shaft and the mounting shaft.

[0009] Preferably, the driving unit includes a strip plate disposed in the mounting groove, a fixing plate connected to one end of the L-shaped plate, and a guide assembly for driving the strip plate to move. The strip plate has two inclined grooves, and the two fixing plates are provided with transmission pins, which are slidably connected in the inclined grooves.

[0010] Preferably, the guide assembly includes a threaded rod rotatably connected to a transfer cart, and two slide rods located on both sides of the threaded rod. A threaded tube is engaged with the threaded rod, and sleeves are provided on the two slide rods. One end of the threaded tube and the sleeve are connected to the same connecting plate. The connecting plate is fixed to the strip plate, and a second motor is provided on the transfer cart to drive the threaded rod.

[0011] Preferably, the connecting assembly includes a third mounting bracket and a connecting shaft rotatably connected to the third mounting bracket, the connecting shaft being connected to the mounting plate.

[0012] Preferably, an angle adjustment assembly is provided between the two mounting plates. The angle adjustment assembly includes a double-threaded tube, two lead screws respectively engaged with the two ends of the double-threaded tube, and a sliding plate disposed between the lead screws and the mounting plate. The threads at both ends of the double-threaded tube are arranged in opposite directions.

[0013] This invention also discloses a method for using box girder formwork in bridge construction, comprising the following steps:

[0014] S1. Place the transfer cart on the template body and drive the double-ended threaded tube to rotate. Through the mutual meshing transmission between the two ends of the double-ended threaded tube and the two screws respectively, the two screws are subjected to force and move closer or further apart. The screws pull the slide plate and the mounting plate connected to the slide plate. Then, through the connection of the connecting shaft, the angle between the two mounting plates can be adjusted.

[0015] S2. The guide assembly drives the strip plate to slide in the mounting groove. During the sliding process of the strip plate, the interaction between the corresponding inclined groove and the transmission pin will drive the two fixed plates and the two L-shaped plates to move away from each other, so that the two mounting plates move towards the template body respectively until the grinding roller abuts against the inner wall of the template body.

[0016] S3. Drive the transfer car to move on the template body. During the movement, start the first motor to drive the rotating shaft and grinding roller to rotate for grinding operation. During the rotation of the rotating shaft, the transmission device will drive the mounting shaft on the fixed frame to rotate, thereby driving the turntable to rotate, so that each protrusion on the turntable abuts against the end of the extrusion rod in turn. After the extrusion rod is subjected to force, it drives the piston plate to slide in the fixed tube, and then resets under the action of the first spring, thereby realizing reciprocating motion.

[0017] S4. The reciprocating motion of the extrusion rod and piston plate draws the external brushing oil into the space between the two one-way valves through the connecting pipe, and then delivers it to the inside of the water pipe through extrusion, spraying it out from each nozzle to brush the inner wall of the template body.

[0018] Compared with the prior art, the present invention can achieve the following technical effects:

[0019] This invention enables automatic grinding and oiling of the inner side of the box girder formwork by setting up a mobile transfer vehicle. It improves the grinding efficiency of the box girder formwork structure while ensuring the quality of oiling and grinding, thereby maximizing construction efficiency and having great application and promotion value. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the transfer vehicle in this invention;

[0023] Figure 3 This is a schematic diagram of the mounting plate in this invention;

[0024] Figure 4 This is a schematic diagram of the transfer vehicle in this invention;

[0025] Figure 5 This is a schematic diagram of the drive unit in this invention;

[0026] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0027] Figure 7 This is a schematic diagram of the oil brushing unit in this invention;

[0028] Figure 8 for Figure 7 Enlarged view of point B in the middle. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] The application principle of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] Example

[0032] like Figure 1-8 As shown, a box girder formwork for bridge construction consists of a formwork body 1, several support frames 2, and a transfer vehicle 3. The support frames 2 are located on both sides of the formwork body 1, providing stable support for the formwork body 1. By setting up the transfer vehicle 3, automatic grinding and painting of the inner side of the box girder formwork body can be achieved. This improves the grinding efficiency of the box girder formwork structure while ensuring the quality of painting and grinding, thereby maximizing construction efficiency.

[0033] The transfer cart 3 has pulleys installed at its four corners, which are slidably connected to the template body 1. The transfer cart 3 has mounting grooves 4, within which a pair of L-shaped plates 5 are slidably connected. The transfer cart 3 has a drive unit 31 that acts on the two L-shaped plates 5. This drive unit 31 consists of a strip plate 311 disposed in the mounting groove 4, a fixing plate 312 connected to one end of the L-shaped plate 5, and a guide assembly. The strip plate 311 has two inclined grooves 314, and the two fixing plates 312 have transmission pins 313 for transmission. Pin 313 is slidably connected in inclined groove 314. The guide assembly is used to drive the strip plate 311 to move. It consists of threaded rod 315 rotatably connected to transfer car 3 and two sliding rods 316 located on both sides of threaded rod 315. Threaded tube 317 is engaged with threaded rod 315. Sleeves are provided on the two sliding rods 316. One end of threaded tube 317 and sleeve is connected to the same connecting plate 318. Connecting plate 318 is fixed to strip plate 311. Transfer car 3 is also provided with a second motor 319 to drive threaded rod 315.

[0034] An mounting plate 6 is connected to the L-shaped plate 5 via a connecting assembly 51. The connecting assembly 51 consists of a third mounting bracket 511 and a connecting shaft 512 rotatably connected to the third mounting bracket 511. The connecting shaft 512 is connected to the mounting plate 6. Meanwhile, an angle adjustment assembly 61 is provided between the two mounting plates 6. The angle adjustment assembly 61 consists of a double-threaded tube 611, two lead screws 612 respectively meshing with the two ends of the double-threaded tube 611, and a sliding plate 613 disposed between the lead screws 612 and the mounting plate 6. The threads at both ends of the double-threaded tube 611 are arranged in opposite directions.

[0035] In use, the transfer cart 3 is placed on the upper part of the inner side of the template body 1. After placement, the double-threaded tube 611 is driven to rotate. Since the threads at both ends of the double-threaded tube 611 are set in opposite directions, during the rotation of the double-threaded tube 611, the two screws 612 are driven to move closer or further apart by the mutual meshing transmission between the two ends of the double-threaded tube 611 and the two screws 612 respectively. Then, the two sliding plates 613 push the two mounting plates 6 respectively. With the help of the rotating third mounting bracket 511 and the connecting shaft 512, the angle of use of the two mounting plates 6 is adjusted so that the two mounting plates 6 are parallel to the templates on both sides of the inner side of the template body 1.

[0036] Two mounting plates 6 are equipped with a cleaning unit 7 and an oiling unit 8 on the side near the template body 1. The cleaning unit 7 consists of a first mounting frame 71, a rotating shaft 72, a grinding roller 73, and a first motor 74. The rotating shaft 72 is rotatably connected to the first mounting frame 71, and the grinding roller 73 is fitted onto the rotating shaft 72. The first motor 74 drives the rotating shaft 72. The oiling unit 8 consists of a second mounting frame 81, a water pipe 82, a nozzle 83, and a connecting pipe 84. The water pipe 82 is fixedly connected to the second mounting frame 81 and has a water squeezing assembly inside. The nozzles 83 are evenly distributed along the length of the water pipe 82, and the connecting pipe 84 is installed on the top of the water pipe 82. The water squeezing assembly consists of two one-way valves 821, a fixed pipe 822 located on one side of the upper end of the water pipe 82, and a movable valve 821 slidably installed inside the fixed pipe 822. The piston plate 823 is constructed, and the two one-way valves 821 are directed from one end of the connecting pipe 84 to the water outlet of each nozzle 83. A reciprocating extrusion component is connected to the end of the piston plate 823 away from the water pipe 82. The reciprocating extrusion component consists of an extrusion rod 824, a first spring 825, a fixing frame 826, and a mounting shaft 827. The extrusion rod 824 is connected to the piston plate 823, the first spring 825 is fitted on the extrusion rod 824, the fixing frame 826 is fixedly connected to the mounting plate 6, and the mounting shaft 827 is located on the upper end of the fixing frame 826. A turntable 828 is sleeved on the mounting shaft 827. A ring of protrusions 829 is arranged in an annular array on the turntable 828. The protrusions 829 abut against the end of the extrusion rod 824. The two ends of the first spring 825 are connected to the inner walls of the piston plate 823 and the fixing pipe 822, respectively.

[0037] A transmission device is provided between the rotating shaft 72 and the mounting shaft 827. The transmission device uses a belt, and pulleys are fixedly installed on the rotating shaft 72 and the mounting shaft 827 respectively. The two pulleys are then driven by the belt. During the rotation of the grinding roller 73, the mounting shaft 827 on the fixed frame 826 is driven to rotate through the mutual transmission between the belt and the two pulleys.

[0038] A method for using box girder formwork in bridge construction, the specific steps of which are as follows:

[0039] S1. Place the transfer cart 3 on the template body 1 and drive the double-ended threaded tube 611 to rotate. Through the mutual meshing transmission between the two ends of the double-ended threaded tube 611 and the two lead screws 612, the two lead screws 612 are subjected to force and move closer or further apart. The lead screws 612 pull the slide plate 613 and the mounting plate 6 connected to the slide plate 613. Then, through the connection of the connecting shaft 512, the angle between the two mounting plates 6 can be adjusted.

[0040] S2. The guide assembly drives the strip plate 311 to slide in the mounting groove 4. During the sliding process of the strip plate 311, the interaction between the corresponding inclined groove 314 and the transmission pin 313 will drive the two fixed plates 312 and the two L-shaped plates 5 to move away from each other, so that the two mounting plates 6 will move towards the template body 1 respectively, until the grinding roller 73 abuts against the inner wall of the template body 1.

[0041] S3. Drive the transfer cart 3 to move on the template body 1. During the movement, start the first motor 74 to drive the rotating shaft 72 and the grinding roller 73 to rotate for grinding. During the rotation of the rotating shaft 72, the transmission device will drive the mounting shaft 827 on the fixed frame 826 to rotate, thereby driving the turntable 828 to rotate. This causes the various protrusions 829 on the turntable 828 to contact the end of the extrusion rod 824 in sequence. After the extrusion rod 824 is subjected to force, it drives the piston plate 823 to slide in the fixed tube 822. Then, it is reset under the action of the first spring 825, thereby realizing reciprocating motion.

[0042] S4. The reciprocating motion of the extrusion rod 824 and the piston plate 823 draws the external brushing oil into the space between the two one-way valves 821 through the connecting pipe 84, and then delivers it to the inside of the water pipe 82 through extrusion, and sprays it out from each nozzle 83 to brush the inner wall of the template body 1.

Claims

1. A box girder formwork for bridge construction, comprising a formwork body (1) and a plurality of support frames (2) located on both sides of the formwork body (1), characterized in that: A transfer cart (3) is slidably disposed on the template body (1). An installation groove (4) is provided on the transfer cart (3). A pair of L-shaped plates (5) are slidably connected in the installation groove (4). A drive unit (31) acting on the two L-shaped plates (5) is provided on the transfer cart (3). An installation plate (6) is connected to the L-shaped plate (5) through a connecting component (51). A cleaning unit (7) and an oiling unit (8) that cooperate with each other are provided on the side of the two installation plates (6) close to the template body (1). The cleaning unit (7) includes a first mounting bracket (71), a rotating shaft (72) rotatably connected to the first mounting bracket (71), a grinding roller (73) sleeved on the rotating shaft (72), and a first motor (74) for driving the rotating shaft (72). The brushing unit (8) includes a second mounting bracket (81), a water pipe (82) mounted on the second mounting bracket (81), a plurality of nozzles (83) evenly distributed along the length of the water pipe (82), and a connecting pipe (84) set at the top of the water pipe (82). The water pipe (82) is provided with a water extrusion assembly. The water extrusion assembly includes two one-way valves (821), a fixed pipe (822) located on one side of the upper end of the water pipe (82), and a piston plate (823) slidably installed in the fixed pipe (822). The conduction direction of the two one-way valves (821) is from one end of the connecting pipe (84) to the water outlet of each nozzle (83). A reciprocating extrusion component is connected to the end of the piston plate (823) away from the water pipe (82). The reciprocating extrusion component includes an extrusion rod (824) connected to a piston plate (823), a first spring (825) sleeved on the extrusion rod (824), a fixing frame (826) fixedly connected to a mounting plate (6), and a mounting shaft (827) located at the upper end of the fixing frame (826). A turntable (828) is sleeved on the mounting shaft (827). A plurality of protrusions (829) are arranged in a circular array on the turntable (828). The protrusions (829) abut against the end of the extrusion rod (824). The two ends of the first spring (825) are respectively connected to the inner walls of the piston plate (823) and the fixing tube (822). A transmission device is provided between the rotating shaft (72) and the mounting shaft (827). The drive unit (31) includes a strip plate (311) disposed in the mounting groove (4), a fixing plate (312) connected to one end of the L-shaped plate (5), and a guide assembly for moving the strip plate (311). The strip plate (311) has two inclined grooves (314), and the two fixing plates (312) are provided with transmission pins (313), which are slidably connected in the inclined grooves (314).

2. The box girder formwork for bridge construction according to claim 1, characterized in that: The guiding assembly includes a threaded rod (315) rotatably connected to the transfer cart (3), and two slide rods (316) located on both sides of the threaded rod (315). A threaded tube (317) is engaged with the threaded rod (315), and sleeves are provided on the two slide rods (316). One end of the threaded tube (317) and the sleeve are connected to the same connecting plate (318). The connecting plate (318) is fixed to the strip plate (311). A second motor (319) is provided on the transfer cart (3) to drive the threaded rod (315).

3. A box girder formwork for bridge construction according to claim 1, characterized in that: The connecting assembly (51) includes a third mounting bracket (511) and a connecting shaft (512) rotatably connected to the third mounting bracket (511), the connecting shaft (512) being connected to the mounting plate (6).

4. A box girder formwork for bridge construction according to claim 1, characterized in that: An angle adjustment assembly (61) is provided between the two mounting plates (6). The angle adjustment assembly (61) includes a double-threaded tube (611), two lead screws (612) respectively meshing and connected to both ends of the double-threaded tube (611), and a sliding plate (613) disposed between the lead screws (612) and the mounting plate (6). The threads at both ends of the double-threaded tube (611) are arranged in opposite directions.

5. A method for using box girder formwork for bridge construction according to claim 1, characterized in that, Includes the following steps: S1. Place the transfer cart (3) on the template body (1) and drive the double-ended threaded tube (611) to rotate. Through the mutual meshing transmission between the two ends of the double-ended threaded tube (611) and the two screws (612), the two screws (612) are subjected to force and move closer or further apart. The screws (612) pull the slide plate (613) and the mounting plate (6) connected to the slide plate (613). Then, through the connection of the connecting shaft (512), the angle between the two mounting plates (6) is adjusted. S2. The guide assembly drives the strip plate (311) to slide in the mounting groove (4). During the sliding process of the strip plate (311), the interaction between the corresponding inclined groove (314) and the transmission pin (313) will drive the two fixed plates (312) and the two L-shaped plates (5) to move away from each other, so that the two mounting plates (6) move towards the template body (1) respectively until the grinding roller (73) abuts against the inner wall of the template body (1). S3. Drive the transfer cart (3) to move on the template body (1). During the movement, start the first motor (74) to drive the rotating shaft (72) and the grinding roller (73) to rotate for grinding. During the rotation of the rotating shaft (72), the transmission device will drive the mounting shaft (827) on the fixed frame (826) to rotate, thereby driving the turntable (828) to rotate, so that each protrusion (829) on the turntable (828) will contact the end of the extrusion rod (824) in sequence. After the extrusion rod (824) is subjected to force, it drives the piston plate (823) to slide in the fixed tube (822), and then resets under the action of the first spring (825), thereby realizing reciprocating motion. S4. The external brushing oil is drawn into the space between the two one-way valves (821) through the connecting pipe (84) by the reciprocating motion of the extrusion rod (824) and the piston plate (823), and then conveyed to the interior of the water pipe (82) by extrusion and sprayed out from each nozzle (83) to brush the inner wall of the template body (1).

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