A cast-in-place box girder construction method adjacent to a subway section

Abstract

The application discloses a cast-in-situ box girder construction method for a subway section, and comprises the following steps: step one, leveling a foundation, installing a support, then assembling steel reinforcement cages of various parts and erecting a formwork; step two, erecting a U-shaped frame above the steel reinforcement cage; step three, inserting the tail end of a concrete pump truck conveying pipe into a slot and then conveying concrete; step four, according to the site pouring condition, rotating a corresponding position winding drum, adjusting the transverse position of the tail end of the concrete pump truck conveying pipe and the moving plate, cooperating in pouring operation and maintaining the pull rope; and step five, moving the U-shaped frame longitudinally, thereby driving the moving plate and the tail end of the concrete pump truck conveying pipe to move longitudinally, and pouring operation is conducted on different positions of the steel reinforcement cage; in the process of use, the staff does not need to hold the tail end of the concrete pump truck conveying pipe by hand, and the operation is labor-saving.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a method for constructing cast-in-place box girders adjacent to subway sections. Background Technology

[0002] According to the cast-in-place box girder construction method disclosed in patent document CN112813836A, the method includes: laying strip foundations in the construction area; connecting and installing multiple columns on the strip foundations; assembling construction supports on the multiple columns; installing construction templates on the construction supports, with each construction template enclosing a pouring space; pouring concrete in the pouring space to form a girder; installing prestressed ducts in the poured concrete; tensioning prestressing tendons in the prestressed ducts; inserting the ends of the prestressing tendons to both ends of the girder; and installing the prestressing tendons inside the girder to form a cast-in-place box girder. The cast-in-place box girder construction method provided by this invention aims to solve the problem of cumbersome construction steps and low construction efficiency in existing technologies.

[0003] The above-mentioned method for constructing cast-in-place box girders has certain drawbacks. For example, when the steel cage and the casting formwork are assembled and spliced, and the concrete is poured into the internal space of the steel cage by a concrete pump truck, workers need to hold the end of the concrete pump truck's delivery pipe by hand and also need to make minor adjustments to the pouring position of the end of the concrete pump truck's delivery pipe by hand according to the actual site conditions, which is laborious. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art:

[0005] In the existing method, when the steel cage and the casting formwork are assembled and spliced, and the concrete is poured into the internal space of the steel cage by a concrete pump truck, the workers need to hold the end of the concrete pump truck's delivery pipe by hand, and also need to make fine adjustments to the pouring position of the end of the concrete pump truck's delivery pipe by hand according to the actual site conditions, which is laborious.

[0006] A construction method for cast-in-place box girders adjacent to subway sections was proposed.

[0007] To achieve the above objectives, the present invention adopts the following technical solutions:

[0008] A method for constructing cast-in-place box girders adjacent to a subway section includes the following steps:

[0009] Step 1: Level the foundation, install the support frame, then assemble the steel cages for each part and erect the formwork;

[0010] Step 2: Erect the U-shaped frame above the steel cage;

[0011] Step 3: Insert the end of the concrete pump truck's delivery pipe into the slot and then deliver the concrete.

[0012] Step 4: Based on the on-site pouring situation, rotate the winding drum at the corresponding position, adjust the lateral position of the moving plate and the end of the concrete pump truck delivery pipe, coordinate the pouring operation, and maintain the pull rope.

[0013] Step 5: Move the U-shaped frame longitudinally, thereby driving the moving plate and the end of the concrete pump truck's delivery pipe to move longitudinally, and carry out pouring operations at different positions of the reinforcing cage.

[0014] As a further technical solution of the present invention, in step two, after the U-shaped frame is erected above the steel cage, the wheels at the bottom of the U-shaped frame contact the upper surfaces of the casting templates on both sides of the steel cage.

[0015] As a further technical solution of the present invention, in step four, during the rotation of the winding drum, the pull rope is wound by the guidance of pulley one and pulley two, thereby pulling the moving plate and the end of the concrete pump truck delivery pipe to move through the pull rope.

[0016] As a further technical solution of the present invention, in step four, when the moving plate moves laterally, the moving plate will squeeze the spring one arranged in the corresponding direction. The spring one is squeezed and contracted to store elastic potential energy, which facilitates the later push of the moving plate to reset.

[0017] As a further technical solution of the present invention, in step four, when the moving plate moves horizontally and comes into contact with the limiting rod, the limiting rod generates a corresponding displacement and cooperates with the fixing sleeve to limit the moving plate, so as to prevent the end of the concrete pump truck's delivery pipe from being thrown out of the upper end face of the U-shaped frame.

[0018] As a further technical solution of the present invention, in step four, during the process of the moving plate pushing the limiting rod and the piston plate to move, the lubricating oil in the oil box is squeezed and sprayed onto the outer wall of the corresponding pulley.

[0019] As a further technical solution of the present invention, in step four, when the pull rope comes into contact with the outer wall of pulley one, the pull rope will adhere to the lubricating oil on pulley one, thereby reducing the friction between the pull rope and pulley one during use.

[0020] As a further technical solution of the present invention, in step four, during the process of the moving plate pushing the limiting rod and the piston plate to move, the second spring is compressed and contracts to store elastic potential energy.

[0021] As a further technical solution of the present invention, in step four, when the moving plate moves away from the limiting rod, the elastic potential energy stored in the second spring is released, pushing the piston plate and the limiting rod back to the initial position. During this process, outside air is replenished into the oil box through the air intake one-way valve.

[0022] The beneficial effects of this invention are:

[0023] 1. After the U-shaped frame is erected, insert the end of the concrete pump truck's delivery pipe into the slot on the moving plate to limit the end of the delivery pipe. Then, the concrete pump truck starts working, and concrete is sprayed out from the end of the delivery pipe. At this time, the end of the delivery pipe is pointing downwards towards the reinforcing cage. The delivered concrete fills the reinforcing cage under the action of gravity. During use, the moving plate can move the end of the delivery pipe laterally, and the U-shaped frame can move the end of the delivery pipe longitudinally. This allows for the concrete pump truck to pour concrete at different positions in the reinforcing cage. Furthermore, during the pouring process, workers do not need to support the end of the delivery pipe by hand, making operation easier.

[0024] 2. When the moving plate moves laterally with the end of the concrete pump truck's delivery pipe, in order to prevent the end of the concrete pump truck's delivery pipe from moving out of the U-shaped frame and causing concrete spillage and waste, when the end of the concrete pump truck's delivery pipe moves to be close to the inner wall of the U-shaped frame, the side wall of the moving plate abuts against the end of the limiting rod. Then, it abuts against the limiting rod and the fixing sleeve and moves towards the corresponding pulley until the side wall of the fixing sleeve abuts against the inner wall of the U-shaped mounting frame. At this time, the fixing sleeve and the limiting rod can no longer move, thereby limiting the moving plate and the end of the concrete pump truck's delivery pipe and preventing the end of the concrete pump truck's delivery pipe from being thrown out of the upper surface of the U-shaped frame.

[0025] 3. When the moving plate pushes the limit rod to move, the limit rod drives the piston plate to move. During the movement, the piston plate sprays the lubricating oil in the oil box onto the outer wall of the corresponding pulley one through the oil outlet check valve and the spray nozzle. When pulley one rotates and comes into contact with the pull rope, the pull rope will adhere to the lubricating oil on pulley one, thereby reducing the friction between the pull rope and pulley one during use and extending the service life of the pull rope. Attached Figure Description

[0026] Figure 1 This is a process flow diagram of the present invention;

[0027] Figure 2 This is a schematic diagram showing the connection between the U-shaped frame and the loop-shaped mounting frame of the present invention;

[0028] Figure 3 This is a schematic diagram showing the connection between the spiral mounting frame and the guide post of the present invention;

[0029] Figure 4 This is a schematic diagram of the internal structure of the oil box of the present invention.

[0030] In the diagram: 1. U-shaped frame; 2. Wheel; 3. U-shaped mounting frame; 4. Moving plate; 5. Slot; 6. Guide post; 7. Spring 1; 8. Mounting seat 1; 9. Mounting seat 2; 10. Pulley 1; 11. Pulley 2; 12. Support plate; 13. Winding drum; 14. Rotating rod; 15. Pull rope; 16. Handle; 17. Limiting rod; 18. Fixing sleeve; 19. Oil box; 20. Injector nozzle; 21. Oil outlet check valve; 22. Air inlet check valve; 23. Piston plate; 24. Telescopic rod; 25. Spring 2; 26. Oil filler cap. Detailed Implementation

[0031] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0032] Reference Figures 1-4 A method for constructing cast-in-place box girders adjacent to subway sections includes the following steps:

[0033] Step 1: Level the foundation, install the support frame, then assemble the steel cages for each part and erect the formwork;

[0034] Step 2: Erect the U-shaped frame 1 above the steel cage;

[0035] Step 3: Insert the end of the concrete pump truck's delivery pipe into slot 5 and then deliver the concrete.

[0036] Step 4: According to the on-site pouring situation, rotate the winding drum 13 at the corresponding position, adjust the lateral position of the moving plate 4 and the end of the concrete pump truck delivery pipe, cooperate to carry out the pouring operation, and maintain the pull rope 15.

[0037] Step 5: Move the U-shaped frame 1 longitudinally, thereby driving the moving plate 4 and the end of the concrete pump truck delivery pipe to move longitudinally, and carry out pouring operations at different positions of the steel cage.

[0038] In step two, after the U-shaped frame 1 is erected above the steel cage, the wheels 2 at the bottom of the U-shaped frame 1 come into contact with the upper surfaces of the casting templates on both sides of the steel cage.

[0039] In step four, refer to Figure 2 During the rotation of the winding drum 13, the pull rope 15 is wound around by the pulley 10 and pulley 11, thereby pulling the moving plate 4 and the end of the concrete pump truck delivery pipe through the pull rope 15.

[0040] In step four, refer to Figure 2 and Figure 3When the movable plate 4 moves laterally, it will compress the spring 7 arranged in the corresponding direction. The spring 7 is compressed and stored elastic potential energy, which makes it convenient to push the movable plate 4 to reset later.

[0041] In step four, refer to Figure 3 When the moving plate 4 moves and contacts the limiting rod 17, the limiting rod 17 generates a corresponding displacement and works with the fixing sleeve 18 to limit the moving plate 4, preventing the end of the concrete pump truck's delivery pipe from being thrown out of the upper surface of the U-shaped frame 1.

[0042] In step four, refer to Figure 2 and Figure 3 As the moving plate 4 pushes the limit rod 17 and piston plate 23 to move, the lubricating oil in the oil box 19 is squeezed and sprayed onto the outer wall of the corresponding pulley 10.

[0043] In step four, refer to Figure 3 When the pull rope 15 comes into contact with the outer wall of the pulley 10, the pull rope 15 will adhere to the lubricating oil on the pulley 10, thereby reducing the friction between the pull rope 15 and the pulley 10 during use.

[0044] In step four, refer to Figure 4 During the process of the moving plate 4 pushing the limit rod 17 and piston plate 23 to move, the spring 25 is compressed and stored elastic potential energy.

[0045] In step four, refer to Figure 3 and Figure 4 When the moving plate 4 moves away from the limit rod 17, the elastic potential energy stored in the second spring 25 is released, pushing the piston plate 23 and the limit rod 17 back to the initial position. During this process, outside air is replenished into the oil box 19 through the intake one-way valve 22.

[0046] This invention also discloses an auxiliary tool for use in conjunction with the casting of cast-in-place box girders, referring to... Figure 2 The vehicle includes a U-shaped frame 1, with multiple wheels 2 rotatably mounted on the lower end face of the U-shaped frame 1. A U-shaped mounting frame 3 is fixed on the upper end face of the U-shaped frame 1. A movable plate 4 is horizontally and movably mounted inside the U-shaped mounting frame 3. A slot 5 is opened through the upper end face of the movable plate 4. Two guide posts 6 are symmetrically fixed on the inner wall of the U-shaped mounting frame 3, and each guide post 6 movably passes through the movable plate 4.

[0047] When constructing a cast-in-place box girder, the foundation at the location is first leveled, then the support frame is installed, then the steel reinforcement cages for each part are assembled and the formwork is erected, and then the concrete is poured.

[0048] After the steel cage is assembled, the required casting formwork needs to be spliced ​​on the outside of the steel cage in preparation for the casting operation of this part of the assembled steel cage. To facilitate subsequent operations, the height of the steel cage is usually higher than the height of the casting formwork.

[0049] Reference Figure 2 When preparing for pouring, first move the U-shaped frame 1 above the steel cage to be poured. The wheels 2 at the bottom of the U-shaped frame 1 contact the upper surfaces of the pouring templates on both sides of the steel cage. At this time, the U-shaped frame 1 is erected above the steel cage. The inner wall of the U-shaped frame 1 is located on both sides of the exposed steel cage. During the concrete pouring operation, avoid concrete splashing and spillage.

[0050] Reference Figure 2 and Figure 3 After the U-shaped frame 1 is erected, the end of the concrete pump truck's delivery pipe is inserted into the slot 5 on the moving plate 4 to limit the end of the concrete pump truck's delivery pipe. Then the concrete pump truck starts working, and concrete is sprayed out from the end of the concrete pump truck's delivery pipe. At this time, the end of the concrete pump truck's delivery pipe is facing downwards towards the reinforcing cage. The delivered concrete fills the reinforcing cage under the action of gravity. During use, the moving plate 4 can drive the end of the concrete pump truck's delivery pipe to move laterally, and the U-shaped frame 1 can drive the end of the concrete pump truck's delivery pipe to move longitudinally, thereby coordinating with the concrete pump truck's delivery pipe to perform pouring operations at different positions of the reinforcing cage. Furthermore, during the pouring process, the workers do not need to support the end of the concrete pump truck's delivery pipe with their hands, making the operation labor-saving.

[0051] Reference Figure 3 Multiple springs 7 are movably arranged between the two sides of the movable plate 4 and the inner wall of the U-shaped mounting frame 3, and each spring 7 is movably sleeved on the outer wall of the corresponding guide post 6.

[0052] Reference Figure 2 Mounting base 1 8 and mounting base 2 9 are fixed on both sides of the U-shaped mounting frame 3. Each mounting base 1 8 is rotatably equipped with a pulley 10, and each mounting base 2 9 is rotatably equipped with a pulley 2 11. A receiving plate 12 is fixed on one side of the U-shaped frame 1. Two winding cylinders 13 are symmetrically rotatably arranged on the upper end face of the receiving plate 12 near the middle position. A rotating rod 14 is rotatably arranged on the upper end face of each winding cylinder 13. Pull ropes 15 are fixed on both sides of the moving plate 4. The end of each pull rope 15 movably passes through the side wall of the U-shaped mounting frame 3 and is fixed to the inner wall of the corresponding winding cylinder 13. Each pull rope 15 passes around the corresponding pulley 10 and pulley 2 11.

[0053] Reference Figure 2When in use, after the end of the concrete pump truck's delivery pipe is inserted into slot 5 and concrete is being delivered, the operator can rotate the corresponding winding drum 13 according to the on-site pouring situation. During the rotation of the winding drum 13, the pull rope 15 is wound around by the pulley 10 and pulley 11, thereby pulling the moving plate 4 and the end of the concrete pump truck's delivery pipe. When the operator rotates the winding drum 13 located on the right, the moving plate 4 drives the end of the concrete pump truck's delivery pipe to move to the right. When the operator rotates the winding drum 13 located on the left, the moving plate 4 drives the end of the concrete pump truck's delivery pipe to move to the left, thus coordinating the pouring operation.

[0054] Reference Figure 3 When the moving plate 4 moves laterally, it will compress the spring 7 arranged in the corresponding direction. The spring 7 is compressed and stored elastic potential energy, which makes it convenient to push the moving plate 4 to reset later.

[0055] Reference Figure 2 A handle 16 is fixed on one side of the receiving plate 12, which makes it convenient for workers to push the U-shaped frame 1 forward to cooperate in the pouring of the entire steel cage at this stage.

[0056] Each U-shaped mounting frame 3 has a limit rod 17 movably installed on its inner wall, and a fixing sleeve 18 is fixedly sleeved on the outer wall of the limit rod 17.

[0057] Reference Figure 2 and Figure 3 When the moving plate 4 moves laterally with the end of the concrete pump truck delivery pipe, in order to prevent the end of the concrete pump truck delivery pipe from moving out of the U-shaped frame 1 and causing concrete spillage and waste, when the end of the concrete pump truck delivery pipe moves to be close to the inner wall of the U-shaped frame 1, the side wall of the moving plate 4 abuts against the end of the limiting rod 17, and then moves towards the corresponding pulley 10 after abutting against the limiting rod 17 and the fixing sleeve 18, until the side wall of the fixing sleeve 18 abuts against the inner wall of the U-shaped mounting frame 3. At this time, the fixing sleeve 18 and the limiting rod 17 can no longer move, thereby limiting the moving plate 4 and the end of the concrete pump truck delivery pipe and preventing the end of the concrete pump truck delivery pipe from being thrown out of the upper surface of the U-shaped frame 1.

[0058] Reference Figure 3 and Figure 4Oil boxes 19 are fixed on both sides of the U-shaped mounting frame 3 and near the corresponding pulley 10. The oil boxes 19 are filled with lubricating oil. A spray nozzle 20 is connected to the side of the oil box 19 near the pulley 10. An oil outlet check valve 21 is fixed inside the oil box 19. An air inlet check valve 22 is connected to the upper end face of the oil box 19. A piston plate 23 is movably installed inside the oil box 19. The end of the limiting rod 17 moves through the oil box 19 and is fixedly connected to the side wall of the piston plate 23. A telescopic rod 24 is fixed between the side of the piston plate 23 away from the limiting rod 17 and the inner wall of the oil box 19. A spring 25 is fixed between the piston plate 23 and the inner wall of the oil box 19. The spring 25 is movably sleeved on the outer side wall of the telescopic rod 24.

[0059] Reference Figure 3 and Figure 4 When the moving plate 4 pushes the limit rod 17 to move, the limit rod 17 drives the piston plate 23 to move. During the movement, the piston plate 23 sprays the lubricating oil in the oil box 19 through the oil outlet check valve 21 and the spray nozzle 20 onto the outer wall of the corresponding pulley 10. When the pulley 10 rotates and contacts the pull rope 15, the pull rope 15 will adhere to the lubricating oil on the pulley 10, thereby reducing the friction between the pull rope 15 and the pulley 10 during use and extending the service life of the pull rope 15.

[0060] The movement of the limit rod 17 and the piston plate 23 is relatively small, which will not cause a large amount of lubricating oil to be sprayed out.

[0061] Reference Figure 4 When the moving plate 4 pushes the limiting rod 17 and the piston plate 23 to move, the piston plate 23 will squeeze the second spring 25. The second spring 25 is squeezed and contracted to store elastic potential energy. When the moving plate 4 moves away from the limiting rod 17, the elastic potential energy stored on the second spring 25 is released, pushing the piston plate 23 and the limiting rod 17 back to the initial position. During this process, outside air is replenished into the oil box 19 through the intake one-way valve 22.

[0062] Reference Figure 3 Each oil box 19 has an oil filling cap 26 on its upper surface. When the lubricating oil in the oil box 19 is almost used up, the oil filling cap 26 can be opened to inject additional lubricating oil into the oil box 19.

[0063] When using this invention, refer to Figure 2 First, move the U-shaped frame 1 above the steel cage to be poured. The wheels 2 at the bottom of the U-shaped frame 1 contact the upper surfaces of the pouring templates on both sides of the steel cage. At this time, the U-shaped frame 1 is erected above the steel cage. The inner wall of the U-shaped frame 1 is located on both sides of the exposed steel cage. This prevents concrete from splashing and falling during concrete pouring.

[0064] Reference Figure 2 and Figure 3 After the U-shaped frame 1 is erected, the end of the concrete pump truck's delivery pipe is inserted into the slot 5 on the moving plate 4 to limit the end of the concrete pump truck's delivery pipe. Then the concrete pump truck starts working, and concrete is sprayed out from the end of the concrete pump truck's delivery pipe. At this time, the end of the concrete pump truck's delivery pipe is facing downwards towards the reinforcing cage. The delivered concrete fills the reinforcing cage under the action of gravity. During use, the moving plate 4 can drive the end of the concrete pump truck's delivery pipe to move laterally, and the U-shaped frame 1 can drive the end of the concrete pump truck's delivery pipe to move longitudinally, so as to cooperate with the concrete pump truck's delivery pipe to carry out pouring operations at different positions of the reinforcing cage. Moreover, during the pouring process, the workers do not need to support the end of the concrete pump truck's delivery pipe with their hands, making the operation labor-saving.

[0065] Reference Figure 3 When the moving plate 4 moves laterally with the end of the concrete pump truck delivery pipe, in order to prevent the end of the concrete pump truck delivery pipe from moving out of the U-shaped frame 1 and causing concrete spillage and waste, when the end of the concrete pump truck delivery pipe moves to be close to the inner wall of the U-shaped frame 1, the side wall of the moving plate 4 abuts against the end of the limiting rod 17, and then moves towards the corresponding pulley 10 after abutting against the limiting rod 17 and the fixing sleeve 18, until the side wall of the fixing sleeve 18 abuts against the inner wall of the U-shaped mounting frame 3. At this time, the fixing sleeve 18 and the limiting rod 17 can no longer move, thereby limiting the moving plate 4 and the end of the concrete pump truck delivery pipe and preventing the end of the concrete pump truck delivery pipe from being thrown out of the upper surface of the U-shaped frame 1.

[0066] Reference Figure 2 , Figure 3 and Figure 4 When the moving plate 4 pushes the limit rod 17 to move, the limit rod 17 drives the piston plate 23 to move. During the movement, the piston plate 23 sprays the lubricating oil in the oil box 19 through the oil outlet check valve 21 and the spray nozzle 20 onto the outer wall of the corresponding pulley 10. When the pulley 10 rotates and contacts the pull rope 15, the pull rope 15 will adhere to the lubricating oil on the pulley 10, thereby reducing the friction between the pull rope 15 and the pulley 10 during use and extending the service life of the pull rope 15.

[0067] Reference Figure 4 When the moving plate 4 pushes the limiting rod 17 and the piston plate 23 to move, the piston plate 23 will squeeze the second spring 25. The second spring 25 is squeezed and contracted to store elastic potential energy. When the moving plate 4 moves away from the limiting rod 17, the elastic potential energy stored on the second spring 25 is released, pushing the piston plate 23 and the limiting rod 17 back to the initial position. During this process, outside air is replenished into the oil box 19 through the intake one-way valve 22.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for constructing cast-in-place box girders adjacent to a subway section, characterized in that, Includes the following steps: Step 1: Level the foundation, install the support frame, then assemble the steel cages for each part and erect the formwork; Step 2: Erect the U-shaped frame (1) above the steel cage; Step 3: Insert the end of the concrete pump truck's delivery pipe into the slot (5) and then deliver the concrete; Step 4: According to the on-site pouring situation, rotate the corresponding position of the winding drum (13), adjust the lateral position of the moving plate (4) and the end of the concrete pump truck delivery pipe, cooperate to carry out the pouring operation, and maintain the pull rope (15). Step 5: Move the U-shaped frame (1) longitudinally, thereby driving the moving plate (4) and the end of the concrete pump truck delivery pipe to move longitudinally, and carry out pouring operations at different positions of the steel cage; The method is suitable for using an auxiliary tool for casting in place box girder. The auxiliary tool includes a U-shaped frame (1), with multiple wheels (2) rotatably arranged on the lower end face of the U-shaped frame (1), and a U-shaped mounting frame (3) fixed on the upper end face of the U-shaped frame (1). A movable plate (4) is horizontally and movably arranged inside the U-shaped mounting frame (3). A slot (5) is opened through the upper end face of the movable plate (4). Two guide posts (6) are symmetrically fixed on the inner wall of the U-shaped mounting frame (3), and each guide post (6) movably passes through the movable plate (4). Multiple springs (7) are movably installed between the two sides of the movable plate (4) and the inner wall of the U-shaped mounting frame (3), and each spring (7) is movably sleeved on the outer wall of the corresponding guide post (6). Mounting seat 1 (8) and mounting seat 2 (9) are fixed on both sides of the U-shaped mounting frame (3). Each mounting seat 1 (8) is rotatably equipped with pulley 1 (10), and each mounting seat 2 (9) is rotatably equipped with pulley 2 (11). A receiving plate (12) is fixed on one side of the U-shaped frame (1). Two winding cylinders (13) are symmetrically rotatably mounted on the upper end face of the receiving plate (12) and near the middle position. A rotating rod (14) is rotatably mounted on the upper end face of each winding cylinder (13). Pull ropes (15) are fixed on both sides of the moving plate (4). The end of each pull rope (15) moves through the side wall of the U-shaped mounting frame (3) and is fixed on the inner wall of the corresponding winding cylinder (13). Each pull rope (15) passes around the corresponding pulley 1 (10) and pulley 2 (11). Each loop mounting frame (3) has a limit rod (17) movably installed on its inner wall, and a fixing sleeve (18) is fixedly sleeved on the outer wall of the limit rod (17). Oil boxes (19) are fixed on both sides of the U-shaped mounting frame (3) and near the corresponding pulley one (10). The oil boxes (19) are filled with lubricating oil. A spray nozzle (20) is connected to the side of the oil box (19) near the pulley one (10). An oil outlet check valve (21) is fixed inside the oil box (19). An air inlet check valve (22) is connected to the upper end face of the oil box (19). A piston plate (23) is movably installed inside the oil box (19). The end of the limit rod (17) moves through the oil box (19) and is fixedly connected to the side wall of the piston plate (23). A telescopic rod (24) is fixed between the side of the piston plate (23) away from the limit rod (17) and the inner wall of the oil box (19). A spring two (25) is fixed between the piston plate (23) and the inner wall of the oil box (19). The spring two (25) is movably sleeved on the outer side wall of the telescopic rod (24).

2. The method for constructing cast-in-place box girders adjacent to a subway section according to claim 1, characterized in that, In step two, after the U-shaped frame (1) is erected above the steel cage, the wheels (2) at the bottom of the U-shaped frame (1) come into contact with the upper surfaces of the casting templates on both sides of the steel cage.

3. The method for constructing cast-in-place box girders adjacent to a subway section according to claim 1, characterized in that, In step four, as the winding drum (13) rotates, the pull rope (15) is guided by pulley one (10) and pulley two (11), which winds the pull rope (15), thereby pulling the moving plate (4) and the end of the concrete pump truck delivery pipe through the pull rope (15).

4. The method for constructing cast-in-place box girders adjacent to a subway section according to claim 1, characterized in that, In step four, when the moving plate (4) moves laterally, the moving plate (4) will squeeze the spring one (7) arranged in the corresponding direction. The spring one (7) is squeezed and contracted to store elastic potential energy, which is convenient for pushing the moving plate (4) to reset later.

5. The method for constructing cast-in-place box girders adjacent to a subway section according to claim 1, characterized in that, In step four, when the moving plate (4) moves and contacts the limiting rod (17), the limiting rod (17) generates a corresponding displacement and cooperates with the fixing sleeve (18) to limit the moving plate (4) to prevent the end of the concrete pump truck delivery pipe from being thrown out of the upper surface of the U-shaped frame (1).

6. The method for constructing cast-in-place box girders adjacent to a subway section according to claim 5, characterized in that, In step four, as the moving plate (4) pushes the limiting rod (17) and piston plate (23) to move, the lubricating oil in the oil box (19) is squeezed and sprayed onto the outer wall of the corresponding pulley (10).

7. The method for constructing cast-in-place box girders adjacent to a subway section according to claim 6, characterized in that, In step four, when the pull rope (15) comes into contact with the outer wall of pulley one (10), the pull rope (15) will adhere to the lubricating oil on pulley one (10), thereby reducing the friction between the pull rope (15) and pulley one (10) during use.

8. A method for constructing cast-in-place box girders adjacent to a subway section according to claim 6, characterized in that, In step four, as the moving plate (4) pushes the limiting rod (17) and the piston plate (23) to move, the second spring (25) is compressed and contracts to store elastic potential energy.

9. A method for constructing cast-in-place box girders adjacent to a subway section according to claim 8, characterized in that, In step four, when the moving plate (4) moves away from the limit rod (17), the elastic potential energy stored in the second spring (25) is released, pushing the piston plate (23) and the limit rod (17) back to the initial position. During this process, outside air is replenished into the oil box (19) through the intake one-way valve (22).

Images