A prefabrication site structure and production method for sunken bridge piers

Abstract

The application discloses a sunken pier precast site structure and a production method, belongs to the technical field of pier precast, and comprises a working area arranged on the ground, wherein the working area is provided with a sunken working well, the depth of the sunken working well is not less than the height of a formwork erection, a bearing base for bearing a reinforcement cage and a formwork is arranged in the sunken working well, and the working area is provided with a gantry crane and a movement mechanism for driving the gantry crane to move in the horizontal direction. The application has the effect of conveniently ensuring the stability of concrete pouring into the formwork, thereby conveniently ensuring the forming quality of the precast pier after pouring and forming.

Description

Technical Field

[0001] This invention relates to the field of bridge pier prefabrication, and in particular to a prefabrication site structure and production method for sunken bridge piers. Background Technology

[0002] Precast bridge piers are a new bridge construction technology that reduces construction time and costs by modularizing and standardizing precast concrete piers and assembling them on-site. This technology allows architects and engineers to flexibly select the optimal pier type based on actual terrain conditions and quickly install them on-site.

[0003] In existing prefabricated bridge pier production processes, the following steps are typically required: first, tying the reinforcing cage; then, hoisting the cage to the ground work area; subsequently, erecting formwork layer by layer around the cage; finally, constructing a work platform at the top of the formwork; and finally, pouring concrete into the erected formwork via vertically installed pumping pipes. After the prefabricated bridge pier is fully formed within the formwork, it is demolded, and then horizontally placed onto transport vehicles using a combination of gantry cranes and tower cranes for transport.

[0004] Regarding the existing technologies mentioned above, the height of precast bridge piers is usually quite high, exceeding 15m. Vertically installed pumping pipes make it difficult to ensure the stability of concrete when it is poured into the formwork, which in turn makes it difficult to guarantee the final quality of the precast bridge pier after casting. Summary of the Invention

[0005] To ensure the stability of concrete when it is poured into the formwork, and thus to ensure the quality of the precast bridge piers after casting, this application provides a sunken bridge pier precast site structure and production method.

[0006] The technical solution for a prefabrication site structure for sunken bridge piers provided in this application is as follows:

[0007] A prefabrication yard structure for sunken bridge piers includes a working area set on the ground, wherein the working area has a sunken working well with a depth not less than the height of the formwork erection, and a bearing base for supporting the reinforcing cage and formwork is provided in the sunken working well. The working area is equipped with a gantry crane and a motion mechanism for driving the gantry crane to move in the horizontal direction.

[0008] By adopting the above technical solution, during the production of precast bridge piers, after the steel reinforcement cage is tied, it is first transported to the bearing base by a gantry crane and a moving mechanism. Then, the formwork is erected in layers, and the successively erected formwork is transported to the bearing base by a gantry crane and a moving mechanism. The formwork layers are then connected and fixed within the bearing base. After the formwork is erected, concrete is poured into the formwork through a transport pipeline. The setting of the sinking working shaft greatly reduces the height of the top of the formwork, making it easier for the transport pipeline to pour concrete from the top of the formwork in a horizontal or lowered state. This helps to ensure the stability of the concrete when it is poured into the formwork, and thus helps to ensure the forming quality of the precast bridge pier after casting. At the same time, when the top of the formwork is at or below the ground, workers can build a working platform on the ground or inside the sinking working shaft, avoiding high-altitude work by workers on the working platform above the formwork, thus ensuring high safety.

[0009] Optionally, the supporting base is located near one of the inner walls of the sinking working well, and multiple working platforms distributed vertically are installed on the inner wall of the sinking working well near the supporting base, with ladders provided between adjacent working platforms.

[0010] By adopting the above technical solution, the setting of multiple working platforms facilitates the fixed splicing of templates at different heights, which is highly applicable. At the same time, each working platform erected on the inner wall of the sinking working well can be reused after one erection without repeated disassembly and assembly, which helps to fully ensure the work efficiency during the mass prefabrication of bridge piers.

[0011] Optionally, the sinking working well is provided with a positioning mechanism for positioning the reinforcing cage and formwork. The positioning mechanism includes positioning blocks, a driving component, and a lifting component. Multiple positioning blocks are evenly distributed circumferentially toward the axis of the bearing base. The driving component is used to drive each positioning block to move toward or away from the axis of the bearing base. The lifting component is used to drive each positioning block and the driving component to move in the vertical direction.

[0012] By adopting the above technical solution, when the steel cage or formwork is placed in the middle of each positioning block, the driving component can drive each positioning block to move in the direction close to the axis of the bearing base, so that each positioning block can achieve the centering and positioning of the steel cage or formwork. This helps to ensure the consistency and stability during the mass prefabrication of bridge piers. At the same time, the setting of the lifting component driving each positioning block and the driving component moving in the vertical direction makes it easy for each positioning block to position the steel cage or formwork at different heights, which is highly applicable.

[0013] Optionally, the driving assembly includes a fixed base, a rotating ring, and a driving component. The fixed base has a clearance hole for the template to pass through. The rotating ring is coaxially rotatably mounted on the fixed base. The rotating ring is fixedly connected with driving helical teeth. Each positioning block has a driving groove. The driving helical teeth pass through the driving grooves of each positioning block and slide in cooperation with each driving groove. Each positioning block slides in cooperation with the fixed base along the radial direction. The driving component is used to drive the rotating ring to rotate.

[0014] By adopting the above technical solution, when the driving component drives the rotating ring to rotate, each positioning block moves towards or away from the axis of the fixed seat due to the sliding cooperation between the driving helical teeth and the driving slide groove and the limiting action of the fixed seat. The rotation of a single rotating ring can make each positioning block move synchronously, thus making the movement of each positioning block convenient and fast.

[0015] Optionally, the driving component includes a drive motor, a driving gear, and a driven gear ring. The driven gear ring is coaxially fixedly mounted on the rotating ring. The driving gear is rotatably mounted on the fixed base and meshes with the driven gear ring. The drive motor is mounted on the fixed base and is used to drive the driving gear to rotate.

[0016] By adopting the above technical solution, when the drive motor drives the active gear to rotate, the driven gear ring will rotate together with the rotating ring due to the meshing with the active gear. The setting of the drive motor makes the rotation around its own axis fast and stable.

[0017] Optionally, the lifting assembly includes a lifting base, a lifting screw, a lifting guide rod, a lifting worm gear, a lifting worm, and a lifting motor. The lifting worm is rotatably mounted on the lifting base, and the lifting motor drives the lifting worm to rotate. The lifting worm gear is rotatably mounted on the lifting base and meshes with the lifting worm. The lifting screw passes through the lifting worm gear and is threadedly engaged with it. One end of the lifting screw is rotatably mounted on the bottom of the fixed base, and one end of the lifting guide rod is fixedly mounted on the bottom of the fixed base. The lifting guide rod passes through the lifting base and slides with it.

[0018] By adopting the above technical solution, when the lifting motor drives the lifting worm gear to rotate, the lifting worm wheel rotates synchronously. The lifting screw, due to its threaded engagement with the lifting worm wheel and under the limiting action of the lifting guide rod, drives the fixed seat to move vertically together. The cooperation between the lifting worm wheel and the lifting worm gear drives the lifting screw to move vertically, making it less likely for the lifting screw to interfere with the position of the steel cage and formwork during hoisting under normal conditions, thus making it highly applicable.

[0019] Optionally, multiple lifting screws are provided, and multiple lifting worm gears are provided, each corresponding to one of the lifting screws. Each lifting worm gear is coaxially and fixedly connected to a synchronous pulley. A synchronous belt is wound between the synchronous pulleys of two adjacent lifting worm gears, and the synchronous pulleys of two adjacent lifting worm gears are engaged with the synchronous belt.

[0020] By adopting the above technical solution, when one of the lifting worm gears rotates, all the lifting worm gears rotate together through the cooperation of the synchronous pulley and the synchronous belt, thereby synchronously realizing the vertical movement of each lifting screw. The arrangement of multiple lifting screws is beneficial to further ensure the stability of the fixed seat when it moves in the vertical direction. On the other hand, the arrangement of multiple lifting screws disperses the load-bearing force when a single lifting screw drives the fixed seat to move in the vertical direction, which is beneficial to further realize the stable load-bearing of the fixed seat.

[0021] Optionally, each of the synchronous belts is provided with a tensioning assembly on its outer side. The tensioning assembly includes a tensioning wheel, a tensioning fixed seat, a tensioning mounting seat, a tensioning screw, and a tensioning motor. The tensioning wheel is rotatably mounted on the tensioning mounting seat and abuts against the synchronous belt. The tensioning mounting seat is slidably fitted to the tensioning fixed seat. The tensioning screw is rotatably mounted on the tensioning fixed seat. The tensioning screw passes through the tensioning mounting seat in a horizontal direction and is threadedly fitted to the tensioning mounting seat. The tensioning motor is used to drive the tensioning screw to rotate.

[0022] By adopting the above technical solution, when the tensioning motor drives the tensioning screw to rotate, the tensioning mounting seat, due to its threaded engagement with the tensioning screw, drives the tensioning wheel to move towards or away from the synchronous belt, thereby enabling the tensioning wheel to tension the synchronous belt, which helps to further ensure the stability of the rotation of two adjacent tensioning screws.

[0023] Optionally, the positioning block includes a positioning base, a positioning plate, and a positioning telescopic cylinder. The driving groove is formed in the positioning base, the positioning plate is rotatably mounted on one end of the positioning base near the axis of the bearing base, and the positioning telescopic cylinder is used to drive the positioning plate to rotate in a direction closer to or away from the axis of the bearing base.

[0024] By adopting the above technical solution, when the positioning plate is driven by the positioning telescopic cylinder to rotate towards the direction close to the axis of the bearing base to a state perpendicular to the positioning base, the contact area of ​​the positioning block when positioning the rebar cage or formwork is increased, making the rebar cage or formwork less likely to be damaged due to excessive local stress, and facilitating more stable positioning of the rebar cage or formwork.

[0025] This application also provides a production method for a prefabricated structure of a sunken bridge pier, comprising the following steps: S1, erecting a reinforcing cage in the work area, and hoisting the reinforcing cage to the bearing base inside the sunken working shaft after the cage is erected; S2, erecting formwork in layers, and hoisting each layer of formwork sequentially to the bearing base for connection, and erecting the formwork to the required height on the bearing base; S3, after the formwork is erected on the bearing base, pouring concrete into the formwork through a transport pipeline; S4, after the concrete bridge pier is formed, dismantling each layer of formwork sequentially through a work platform set on the inner wall of the sunken working shaft, and hoisting the dismantled layer of formwork outside the sunken working shaft; S5, curing the formed concrete bridge pier, and hoisting the cured concrete bridge pier to a transport vehicle for transportation using a gantry crane.

[0026] By adopting the above technical solution, the setting of the sinking working shaft greatly reduces the height of the top of the concrete pouring position of the formwork, which facilitates the pouring of concrete from the top of the formwork in a horizontal or lowered state. This helps to ensure the stability of the concrete when it is poured into the formwork, and thus helps to ensure the forming quality of the precast bridge pier after casting. At the same time, the height difference between the precast bridge pier cured in the sinking working shaft and the gantry crane is relatively large, so there is no need to use a tower crane. The precast bridge pier can be quickly hoisted into the transport vehicle by the gantry crane, which helps to ensure the transportation efficiency of the precast bridge pier after casting.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The setting of the sinking working well greatly reduces the height of the top of the formwork, which makes it easier for the transport pipeline to pour concrete from the top of the formwork in a horizontal or lowered state. This helps to ensure the stability of the concrete when it is poured into the formwork, and thus helps to ensure the forming quality of the precast bridge pier after casting.

[0029] 2. By driving each positioning block to move towards the axis of the bearing base through the driving component, each positioning block can achieve centering and positioning of the steel cage or formwork, which helps to ensure the consistency and stability of bridge piers during mass prefabrication.

[0030] 3. The use of multiple lifting screws helps to ensure the stability of the fixed seat when it moves vertically. On the other hand, the multiple lifting screws disperse the load-bearing force when a single lifting screw drives the fixed seat to move vertically, which helps to further achieve stable load-bearing on the fixed seat.

[0031] 4. The height difference between the precast bridge piers cured in the sinking working shaft and the gantry is relatively large, so there is no need to use a tower crane. The precast bridge piers can be quickly hoisted into the transport vehicle for transportation by the gantry crane, which helps to ensure the transportation efficiency of the precast bridge piers after they are formed. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0033] Figure 2 This is a frontal view of the sinking working well in an embodiment of this application.

[0034] Figure 3 This is a three-dimensional structural diagram of the positioning mechanism in the embodiments of this application.

[0035] Figure 4 This is a partial cross-sectional view of the positioning block in an embodiment of this application.

[0036] Figure 5 yes Figure 3 A magnified view of part A in the diagram.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Working area; 2. Submerged working shaft; 3. Bearing base; 4. Gantry crane; 5. Guide rail; 6. Working platform; 7. Ladder; 8. Positioning block; 801. Positioning base; 802. Positioning plate; 803. Positioning telescopic cylinder; 9. Receiving groove; 10. Fixed seat; 101. Seat body; 102. Limiting ring; 11. Rotating ring; 12. Clearance hole; 13. Drive helical gear; 14. Drive slide groove; 15. Sliding groove 16. Drive motor; 17. Drive gear; 18. Driven gear ring; 19. Lifting base; 20. Lifting screw; 21. Lifting guide rod; 22. Lifting worm gear; 23. Lifting worm; 24. Lifting motor; 25. Alternating hole; 26. Synchronous pulley; 27. Synchronous belt; 28. Pressure roller; 29. ​​Tensioning roller; 30. Tensioning fixing seat; 31. Tensioning mounting seat; 32. Tensioning screw; 33. Tensioning motor. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0040] This application discloses a prefabrication site structure for sunken bridge piers. (Refer to...) Figure 1 The prefabrication site structure for sunken bridge piers includes a working area 1 set on the ground. The working area 1 has a sunken working well 2, which is rectangular in shape. The depth of the sunken working well 2 is not less than the height of the formwork erection. In this embodiment, the depth of the sunken working well 2 and the formwork erection are both selected as 15m.

[0041] Reference Figure 1 and Figure 2The bottom wall of the sinking working shaft 2 is fixedly provided with a bearing base 3 for supporting the reinforcing cage and formwork. The working area 1 is provided with a gantry crane 4 and a motion mechanism that drives the gantry crane 4 to move in the horizontal direction. Specifically, in this embodiment, two gantry cranes 4 are selected. Both gantry cranes 4 are located at the top of the sinking working shaft 2 and are distributed along the length direction of the sinking working shaft 2. The motion mechanism includes a winch (not shown in the figure) and a guide rail 5. There are two guide rails 5, and the two guide rails 5 are respectively located on both sides of the width direction of the sinking working shaft 2 and extend along the length direction of the sinking working shaft 2. The two gantry cranes 4 slide and cooperate with the two guide rails 5 respectively. Two sets of winches are provided corresponding to the gantry cranes 4. The two sets of winches drive the two gantry cranes 4 to slide along the length direction of the guide rails 5 respectively. This part is the prior art, so it will not be described in detail here. When the two gantry cranes 4 slide along the length of the guide rail 5, that is, along the length of the sunken working shaft 2, it is convenient to use the two gantry cranes 4 to hoist and transfer the steel cage or the formwork erected layer by layer in the sunken working shaft 2 and the working area 1 on the ground.

[0042] Reference Figure 2 The supporting base 3 is located on an inner wall near the length of the sinking working well 2. Multiple working platforms 6 are installed on the inner wall near the length of the supporting base 3 along the vertical direction. In this embodiment, the number of working platforms 6 is four. A ladder 7 is provided between each pair of adjacent working platforms 6 to facilitate the movement of workers between the working platforms 6.

[0043] Reference Figure 2 and Figure 3 The sinking working shaft 2 is equipped with a positioning mechanism for positioning the reinforcing cage and formwork. The positioning mechanism includes positioning blocks 8, a drive assembly, and a lifting assembly. The positioning blocks 8 are evenly distributed circumferentially along the axis of the bearing base 3. The positioning blocks 8 include a positioning base 801, a positioning plate 802, and a positioning telescopic cylinder 803. The positioning base 801 is rectangular and one end of its length is set towards the bearing base 3. The positioning plate 802 is rotatably mounted on the top of the positioning base 801, and the rotation point of the positioning plate 802 on the positioning base 801 is located at the end of the positioning base 801 close to the bearing base 3. When each positioning base 801 moves towards the axis close to the bearing base 3 and abuts against the reinforcing cage or formwork, the position of the reinforcing cage or formwork is positioned.

[0044] Reference Figure 3The positioning base 801 has a receiving groove 9 on its top. In this embodiment, the positioning telescopic cylinder 803 is selected as a cylinder. The cylinder body of the positioning telescopic cylinder 803 is rotatably mounted on the bottom wall of the receiving groove 9, and the piston rod of the positioning telescopic cylinder 803 is rotatably mounted on the positioning plate 802. This allows the positioning plate 802 to rotate towards or away from the axis of the bearing base 3 when the positioning telescopic cylinder 803 is driven to rotate towards the axis of the bearing base 3 to a vertical state, that is, perpendicular to the positioning base 801. This increases the contact area between the positioning block 8 and the reinforcing cage or template at one end along its length, thereby facilitating more stable positioning of the reinforcing cage or template.

[0045] Reference Figure 3 and Figure 4 The driving assembly includes a fixed base 10, a rotating ring 11, and a driving component. The fixed base 10 includes a base body 101 and a limiting ring 102 coaxially fixedly connected to the top of the base body 101. The base body 101 is rectangular plate-shaped, and a clearance hole 12 is coaxially through-hole in the middle of the base body 101 for the template to pass through. The rotating ring 11 is coaxially rotatably mounted on the inner wall of the limiting ring 102. A driving helical tooth 13 is fixedly connected to the top of the rotating ring 11. A driving groove 14 is opened at the bottom of the positioning base 801 of each positioning block 8. The driving helical tooth 13 passes through the driving groove 14 of each positioning block 8 in sequence and slides and engages with each driving groove 14. The top of the limiting ring 102 is provided with a sliding groove 15 that runs through it in the radial direction. There are four sliding grooves 15 corresponding to the positioning bases 801. The positioning bases 801 of each positioning block 8 slide and engage with each sliding groove 15, so that when the rotating ring 11 rotates, each positioning block 8 moves towards or away from the axis of the rotating ring 11 due to the sliding engagement of the driving sliding groove 14 and the driving spiral teeth 13 and the limiting effect of the sliding groove 15.

[0046] Reference Figure 4 The driving components include a drive motor 16, a driving gear 17, and a driven gear ring 18. The drive motor 16 is fixedly mounted on the outer wall of the limiting ring 102. The driving gear 17 is fixedly mounted on the output end of the drive motor 16 and feeds into the limiting ring 102, where it rotates in a rotatable engagement. The driven gear ring 18 is coaxially fixedly mounted on the bottom of the rotating ring 11 and rotates in a rotatable engagement with the fixed base 10. The driven gear ring 18 meshes with the driving gear 17 so that when the drive motor 16 drives its own output end to rotate, the driven gear ring 18 drives the rotating ring 11 to rotate synchronously.

[0047] Reference Figure 3 and Figure 4The lifting assembly includes a lifting base 19, a lifting screw 20, a lifting guide rod 21, a lifting worm gear 22, a lifting worm 23, and a lifting motor 24. The lifting base 19 is fixedly installed on the bottom wall of the sinking working shaft 2. The lifting motor 24 is installed on the lifting base 19. The lifting worm 23 is fixedly installed on the output end of the lifting motor 24. The lifting worm gear 22 is horizontally rotatably installed on the lifting base 19 and meshes with the lifting worm 23. The lifting screw 20 passes vertically through the lifting worm gear 22 and is threadedly engaged with it. The top of the lifting screw 20 is rotatably connected to... At the bottom of the base 101 of the fixed seat 10, the lifting guide rod 21 is fixedly connected to the bottom of the base 101 of the fixed seat 10. The lifting guide rod 21 passes through the lifting base 19 in the vertical direction and slides with the lifting base 19. The bottom wall of the sinking working well 2 is provided with a clearance hole 25 for the lifting screw 20 and the lifting guide rod 21 to move in the vertical direction. When the lifting motor 24 drives the lifting worm gear 23 to rotate, the lifting worm wheel 22 rotates together, thereby causing the lifting screw 20 to drive the fixed seat 10 to move in the vertical direction under the limiting action of the lifting guide rod 21.

[0048] Reference Figure 3 To further ensure the stability of the fixed base 10 during vertical movement, this embodiment of the application provides four lifting screws 20, each positioned near one of the four corners of the base 101. Four lifting guide rods 21 are also provided, each positioned near the center of one of the four side walls of the base 101 along its length. Multiple lifting worm gears 22 are provided, each corresponding to one of the lifting screws 20. Each lifting worm gear 22 rotatably engages with the lifting base 19. Each lifting screw 20 passes through and is threaded into each lifting worm gear 22. Each lifting worm gear 22 is coaxially and fixedly connected to a synchronous pulley 26. A synchronous belt 27 is wound between the synchronous pulleys 26 of adjacent lifting worm gears 22, and the synchronous pulleys 26 of adjacent lifting worm gears 22 mesh with the synchronous belt 27 to ensure the transmission stability between the synchronous pulleys 26 and the synchronous belt 27.

[0049] Continue to refer to Figure 3 When the lifting motor 24 drives one of the lifting worm gears 22 to rotate the lifting screw 20, each lifting worm gear 22 rotates together through the cooperation of the synchronous pulley 26 and the synchronous belt 27, thereby synchronously realizing the vertical movement of each lifting screw 20. The arrangement of multiple lifting screws 20 is beneficial to further ensure the stability of the fixed seat 10 when it moves in the vertical direction. On the other hand, the multiple lifting screws 20 disperse the load-bearing force when a single lifting screw 20 drives the fixed seat 10 to move in the vertical direction, which is beneficial to further realize the stable load-bearing of the fixed seat 10.

[0050] Reference Figure 3 and Figure 5To further ensure the transmission stability of the synchronous belt 27, a pressure wheel 28 is coaxially rotatably mounted on the outer wall of the guide rod. The pressure wheel 28 is located inside the synchronous belt 27 and presses against the inner wall of the synchronous belt 27. A tensioning assembly is provided on the outer side of each synchronous belt 27. Specifically, the tensioning assembly includes a tensioning wheel 29, a tensioning fixing seat 30, a tensioning mounting seat 31, a tensioning screw 32, and a tensioning motor 33. The tensioning wheel 29 is rotatably mounted on the tensioning mounting seat 31 and abuts against the outer side of the synchronous belt 27. The tensioning mounting seat 31 is slidably fitted to the tensioning fixing seat 30. The tensioning fixing seat 30 is fixedly mounted on the lifting base 19. The tensioning screw 32 is horizontally rotatably mounted on the tensioning fixing seat 30. The tensioning screw 32 is horizontally inserted into the tensioning mounting base 31 and threadedly engaged with it. The tensioning motor 33 is mounted on the tensioning mounting base 30 and drives the tensioning screw 32 to rotate. When the tensioning motor 33 drives the tensioning screw 32 to rotate, the tensioning mounting base 31, due to its threaded engagement with the tensioning screw 32, drives the tensioning wheel 29 to move closer to or further away from the synchronous belt 27, thereby adjusting the tightness of the outer side of the synchronous belt 27. The engagement between the pressure wheel 28 and the tensioning wheel 29 facilitates stable tensioning of the inner and outer sides of the synchronous belt 27, thus ensuring the stability of the two adjacent tensioning screws 32 during rotation.

[0051] The implementation principle of the sunken bridge pier prefabrication yard structure in this application embodiment is as follows: When the prefabricated bridge pier is produced, after the steel cage is tied, the steel cage is first transported to the bearing base 3 by the sliding of the gantry crane 4 along the guide rail 5. Then, the formwork is erected in layers and the successively erected formwork is transported to the bearing base 3 by the sliding of the gantry crane 4 along the guide rail 5. The formwork of each layer is connected and fixed in the bearing base 3. After the formwork is erected, the concrete is poured into the formwork through the transport pipeline. The setting of the sunken working well 2 greatly reduces the height of the top of the formwork, which makes it easier to pour the concrete from the top of the formwork in a horizontal or lowered state. This makes it easier to ensure the stability of the concrete when it is poured into the formwork, and thus makes it easier to ensure the forming quality of the prefabricated bridge pier after casting. At the same time, when the height of the top of the formwork is level with or lower than the ground, the workers can set up a working platform 6 on the ground or the inner wall of the sunken working well 2, avoiding the high-altitude work of the workers on the working platform above the formwork, which is safe.

[0052] This application also discloses a production method for a prefabrication site structure for sunken bridge piers, based on the aforementioned prefabrication site structure for sunken bridge piers, comprising the following specific steps:

[0053] S1, erect a steel cage in the work area 1. After the steel cage is erected, hoist the steel cage to the bearing base 3 in the sinking working well 2.

[0054] S2, erect the formwork in layers. After each layer of formwork is erected, it is hoisted to the bearing base 3 for connection. The formwork is then erected to the required height on the bearing base 3.

[0055] S3, after the formwork is erected on the supporting base 3, concrete is poured into the formwork through the transport pipeline;

[0056] S4. After the concrete pier is formed, the single-layer formwork is dismantled in sequence by the working platform 6 set on the inner wall of the sinking working well 2, and the dismantled single-layer formwork is hoisted to the outside of the sinking working well 2.

[0057] S5, the formed concrete bridge piers are cured, and the cured concrete bridge piers are lifted into the transport vehicle by gantry crane 4 for transportation.

[0058] Specifically, during the curing of concrete bridge piers, the concrete bridge piers can be lifted by the gantry crane 4 to other areas of the sinking working well 2 for curing, so as to realize the pouring of the next concrete bridge pier while curing the concrete, thereby further improving work efficiency.

[0059] The implementation principle of the production method of the precast pier site structure of this application embodiment is as follows: The setting of the sinking working well 2 greatly reduces the height of the top of the concrete pouring position of the formwork, which facilitates the concrete to be poured from the top of the formwork in a horizontal or lowered state by the transport pipeline. This helps to ensure the stability of the concrete when it is poured into the formwork, and thus helps to ensure the forming quality of the precast pier after casting. At the same time, the height difference between the precast pier cured in the sinking working well 2 and the gantry crane is relatively large, so there is no need to use a tower crane. The precast pier can be quickly hoisted into the transport vehicle by the gantry crane 4, which helps to ensure the transportation efficiency of the precast pier after forming.

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sunken pier precast yard structure, characterized by: The application relates to a construction site (1) arranged on the ground, wherein a sunken working well (2) is arranged in the construction site (1), the sunken working well (2) has a depth not less than the height of a formwork, a bearing base (3) for bearing a reinforcing cage and a formwork is arranged in the sunken working well (2), the construction site (1) is provided with a gantry crane (4) and a moving mechanism for driving the gantry crane (4) to move along the horizontal direction; A positioning mechanism for positioning the reinforcing cage and the formwork is arranged in the sunken working well (2), the positioning mechanism comprises positioning blocks (8), a driving assembly and a lifting assembly, a plurality of the positioning blocks (8) are uniformly distributed in the circumferential direction of the axis of the bearing base (3), the driving assembly is used for driving each positioning block (8) to move towards the axis of the bearing base (3) or away from the axis of the bearing base (3), and the lifting assembly is used for driving each positioning block (8) and the driving assembly to move along the vertical direction; The driving assembly comprises a fixed seat (10), a rotating ring (11) and a driving member, the fixed seat (10) is provided with a gap hole (12) for allowing the formwork to pass through, the rotating ring (11) is coaxially and rotatably arranged on the fixed seat (10), the rotating ring (11) is fixedly connected with a driving helical tooth (13), each positioning block (8) is provided with a driving sliding groove (14), the driving helical tooth (13) is arranged in the driving sliding groove (14) of each positioning block (8) and is in sliding fit with each driving sliding groove (14), and each positioning block (8) is in sliding fit with the fixed seat (10) along the radial direction of the fixed seat (10), and the driving member is used for driving the rotating ring (11) to rotate; The positioning block (8) comprises a positioning base (801), a positioning plate (802) and a positioning telescopic cylinder (803), the driving sliding groove (14) is arranged on the positioning base (801), the positioning plate (802) is rotatably arranged on one end of the positioning base (801) close to the axis of the bearing base (3), and the positioning telescopic cylinder (803) is used for driving the positioning plate (802) to rotate towards the axis of the bearing base (3) or away from the axis of the bearing base (3).

2. A precast site structure for a sunken pier according to claim 1, wherein: The bearing base (3) is arranged close to one inner wall of the sunken working well (2), a plurality of working platforms (6) distributed along the vertical direction are arranged on the inner wall of the sunken working well (2) close to the bearing base (3), and a ladder (7) is arranged between two adjacent working platforms (6).

3. A precast site structure for sunken piers according to claim 1, wherein: The driving member comprises a driving motor (16), a driving gear (17) and a driven gear ring (18), the driven gear ring (18) is coaxially and fixedly arranged on the rotating ring (11), the driving gear (17) is rotatably arranged on the fixed seat (10) and is in meshing connection with the driven gear ring (18), and the driving motor (16) is arranged on the fixed seat (10) and is used for driving the driving gear (17) to rotate.

4. The precast site structure for a sunken pier according to claim 1, wherein: The lifting assembly comprises a lifting base (19), a lifting screw rod (20), a lifting guide rod (21), a lifting worm wheel (22), a lifting worm (23) and a lifting motor (24), the lifting worm (23) is rotatably installed on the lifting base (19), the lifting motor (24) is used for driving the lifting worm (23) to rotate, the lifting worm wheel (22) is rotatably installed on the lifting base (19) and is engaged with the lifting worm (23), the lifting screw rod (20) is arranged through the lifting worm wheel (22) and is threadedly matched with the lifting worm wheel (22), one end of the lifting screw rod (20) is rotatably installed on the bottom of the fixed base (10), one end of the lifting guide rod (21) is fixedly installed on the bottom of the fixed base (10), and the lifting guide rod (21) is arranged through the lifting base (19) and is slidably matched with the lifting base (19).

5. A precast site structure for sunken piers according to claim 4 wherein: The lifting screw rod (20) is provided with a plurality of lifting screw rods, the lifting worm wheel (22) is provided with a plurality of lifting worm wheels and corresponds to the lifting screw rod (20) in one-to-one correspondence, each lifting worm wheel (22) is coaxially fixedly connected with a synchronous wheel (26), a synchronous belt (27) is arranged around the synchronous wheels (26) of the adjacent two lifting worm wheels (22), and the synchronous wheels (26) of the adjacent two lifting worm wheels (22) are engaged with the synchronous belt (27).

6. A precast site structure for sunken piers according to claim 5 wherein: Each synchronous belt (27) is provided with a tensioning assembly outside, the tensioning assembly comprises a tensioning wheel (29), a tensioning fixed base (30), a tensioning mounting base (31), a tensioning screw rod (32) and a tensioning motor (33), the tensioning wheel (29) is rotatably installed on the tensioning mounting base (31) and abuts against the synchronous belt (27), the tensioning mounting base (31) is slidably matched with the tensioning fixed base (30), the tensioning screw rod (32) is rotatably installed on the tensioning fixed base (30), the tensioning screw rod (32) is arranged through the tensioning mounting base (31) in the horizontal direction and is threadedly matched with the tensioning mounting base (31), and the tensioning motor (33) is used for driving the tensioning screw rod (32) to rotate.

7. A method of producing a sunken pier precast yard structure, characterized by: The sinking pier prefabrication site structure according to any one of claims 1-6, comprising the following steps: S1, reinforcing cages are erected in the working area (1), and after the reinforcing cages are erected, the reinforcing cages are hoisted to the bearing base (3) in the sinking working well (2); S2, the formwork is erected in layers, and after each single-layer formwork is erected, the single-layer formwork is hoisted to the bearing base (3) in sequence for connection, and the formwork is erected to the required height on the bearing base (3); S3, after the formwork is erected on the bearing base (3), the formwork is poured with concrete through the transportation pipeline; S4, after the concrete pier is formed, each single-layer formwork is removed in sequence through the working platform (6) arranged on the inner wall of the sinking working well (2), and the removed single-layer formwork is hoisted out of the sinking working well (2); and S5, the formed concrete pier is maintained, and the maintained concrete pier is hoisted to the transportation vehicle through the gantry crane (4) for transportation.

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