A precast pier column connection assembly

Abstract

This invention relates to the field of infrastructure construction, specifically to a prefabricated pier connection assembly, comprising a pier body; a connecting guide structure on the upper plate; the connecting guide structure includes two arc-shaped plates arranged in half, which are fitted onto the upper plate; multiple rods are rotatably connected to the outer wall of the ring, extending towards the pile foundation on the ground; the ends of the rods are rotatably connected to collars with notches, which are fitted onto bolts on the pile foundation; the constraint force between the collar and the bolts acts as a pull force on the pier body, allowing the pier body to move downwards along the bolts, while guiding it to gradually align with the bolts, facilitating rapid alignment and improving installation efficiency; during the lowering of the pier body, the collar moves downwards along the bolts, and the collar has a notch, so after being fitted onto the bolts on the lower plate, the collar and the arc-shaped plates can be removed, resulting in a simple structure and convenient assembly / disassembly.

Description

Technical Field

[0001] This invention relates to the field of infrastructure construction, specifically a prefabricated pier column connection assembly. Background Technology

[0002] The standardization and factory-based design and construction of prefabricated assembly have become new technologies, methods and trends in engineering construction. In highway infrastructure, concrete cylindrical piers are prefabricated vertically in the prefabrication plant, flipped and transported to the site for installation. The cylindrical piers are connected to the pile foundation by flanges and reinforced with high-strength non-shrink cement grout, ensuring quality control and simple operation.

[0003] When the cylindrical pier and the pile foundation are connected by flanges, each bolt on the pile foundation needs to be passed through. The cylindrical pier is placed in an upright position by a crane and is usually tied to the cylindrical pier with nylon straps or steel cables. At this time, the cylindrical pier is in an inclined position and is swaying. In this state, it is difficult to align the flange with the bolt, which affects the construction efficiency.

[0004] Therefore, a prefabricated pier column connection component is proposed to address the above problems. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: A precast pier column connection assembly of the present invention includes a pier column body, a connecting flange sleeved at the lower end of the pier column body, the connecting flange including an upper plate, a lower plate, and a sleeve between the upper plate and the lower plate; the upper plate is provided with a connecting guide structure; the connecting guide structure includes two arc-shaped plates arranged in half, the arc-shaped plates are sleeved on the upper plate, the two ends of the arc-shaped plates are fixed to the upper plate by bolts, and form a ring; multiple rods are rotatably connected to the outer wall of the ring, the rods extending towards the pile foundation on the ground; the ends of the rods are rotatably connected to a collar with a notch, the collar being sleeved on a bolt on the pile foundation;

[0007] In use, the pier body is first suspended above the pile foundation by a crane. Then, the half of the arc-shaped plate is fixed to the upper plate. At the same time, the rod and the collar are rotated so that the collar is fitted onto the screw rod. Multiple rods are set on the flange, and multiple collars are fitted onto the screw rod. When the pier body is lowered, the constraint force between the collar and the screw rod plays a traction role on the pier body, allowing the pier body to move downward along the screw rod and gradually align with the screw rod, which helps the screw rod to align quickly and improves installation efficiency. During the lowering of the pier body, the collar moves downward along the screw rod. At the same time, the collar is provided with a notch. After it is fitted onto the screw rod on the lower plate, the collar and the arc-shaped plate can be removed from the screw rod. The structure is simple and easy to disassemble and assemble.

[0008] Preferably, the collar has a sliding hole inside, which runs along the direction of the collar body and passes through both ends of the collar body. A ring-shaped locking rod is slidably connected inside the sliding hole. An annular through groove is formed on the upper surface of the collar body, which connects to the sliding hole. One end of the locking rod is provided with a fastening bolt, which is threaded onto the locking rod and slides along the through groove. The collar has a notch to facilitate the removal of the collar from the screw later. However, this notch also has a drawback: during the lowering of the pier body, the collar and the screw are held together, and the screw may escape along the notch, thus losing the constraint between the collar and the screw and affecting the alignment with the screw. Therefore, a locking rod is provided. After the collar is placed on the screw, the fastening bolt is pushed to push the locking rod out of one end of the sliding hole. At the same time, the end of the locking rod is inserted into the other end of the sliding hole. The fastening bolt is then tightened to stabilize the position of the locking rod. At this time, the collar becomes a complete circle, completely enclosing the rod body, thereby preventing the rod body from escaping from the collar and making the subsequent installation work smoother.

[0009] Preferably, the inner ring surface of the collar has a slot, and a protective plate is provided inside the collar. The protective plate is cylindrical, with one side of the protective plate being disconnected. A locking block is provided on the outer surface of the protective plate, and the locking block is embedded in the slot. The collar and locking rod are made of ferrous metal to ensure service life, but this can also damage the screw. The relative sliding friction between the collar and the screw will wear down the threads on the screw surface. Later, when tightening the nut, the nut is prone to stripping between the screw and the bolt, which seriously affects the quality of the infrastructure. Therefore, a protective plate is provided inside the collar. The protective plate is made of plastic and is embedded in the slot by the locking block. When the pier body is lowered, the collar, together with the protective plate, moves relative to the screw. At this time, the protective plate slides against the surface of the screw, isolating the collar and the screw and protecting the threads on the screw.

[0010] Preferably, the latch is located on the lower end face of the collar, penetrating the lower end face of the collar. The protective plate can be reused until its surface is worn through, at which point it can no longer be used and needs to be replaced with a new one. The cooperation between the latch and the latch facilitates the disassembly and installation of the protective plate. The disconnection on one side of the protective plate also facilitates its removal from the screw. Considering the relative movement between the protective plate and the screw, the frictional force of the protective plate on the screw is upward. Therefore, when setting the latch position, the latch is located on the lower end face of the collar, so that the protective plate can remain stable within the collar when it moves relative to the screw.

[0011] Preferably, the flange holes on the upper and lower plates are waist-shaped, with limiting grooves on both sides of the flange holes. Limiting blocks are embedded in the flange holes, with one end of the limiting blocks being arc-shaped and protrusions on both sides of the limiting blocks, which are embedded in the limiting grooves. The waist-shaped flange holes on the upper and lower plates increase the inlet of the upper end of the screw into the flange hole, which helps in the installation of the screw and the flange. However, this setting will affect the stability between the screw and the flange, and the gap between the screw and the flange hole will be too large. Therefore, limiting blocks are provided in the flange holes. After the pier body is placed on the pile foundation, the limiting blocks are embedded one by one into the flange holes to fill the gap between the screw and the flange hole and ensure the stability between the screw and the flange.

[0012] Preferably, the limiting groove on the upper plate does not penetrate the upper plate, while the limiting groove on the lower plate penetrates the lower plate. The lower plate sits directly on the upper surface of the pile foundation. At this time, the lower end face of the flange hole of the lower plate is sealed, and the limiting block can be stably filled. However, the flange hole of the upper plate penetrates vertically. When the limiting block is filled into the flange hole, the limiting block may fall off. Therefore, the limiting groove of the upper plate does not penetrate the upper plate. After the protrusion is embedded in the limiting groove, the protrusion supports the limiting block in the flange hole, ensuring the stability of the limiting block in the flange hole. Then, the nut is tightened on the screw, and the nut presses the limiting block into the flange hole.

[0013] Preferably, the flange outer ring is fitted with a casting template; the casting template includes an arc-shaped plate and a fixing ring with steel bars; the fixing ring is fitted onto a bolt, the steel bars pass through insertion holes opened in the plate, and the edges of two opposite plates are fixed together by bolts to form a ring, with the upper and lower rings stacked together; after the pier column body is stably placed on the pile foundation, the bolt and the upper plate are tightened with nuts, and then a layer of cement protective layer is poured on the flange outer ring. By setting a cylindrical casting template on the flange outer ring, high-strength non-shrink cement grout is poured into the gap between the casting template and the flange, and then compacted by a vibrator; the steel bars pass through the plate, and after pouring, the plate is removed, and the steel bars, cement, and flange form a whole, improving the overall strength. At the same time, before vibrating the cement, the steel bars are tightened and fixed on the plate, which can improve the stability between the plate and the flange, and also improve the stability of the casting template on the flange.

[0014] Preferably, a sealing groove is provided on the upper end face of the plate, and a sealing strip is provided on the lower end face of the plate. For two adjacent plates, the sealing strip of the upper plate is embedded in the sealing groove on the lower plate. High-strength non-shrink cement grout is a grout made of high-strength materials as aggregates, cement as binder, and supplemented with substances that have high fluidity, micro-expansion, and anti-segregation properties. The aggregate particles are small, and the grout is easy to overflow from the gaps during vibration, especially the gaps between the upper and lower plates. Therefore, sealing strips and sealing grooves are provided to improve the fit and sealing between the upper and lower plates and reduce the penetration of grout.

[0015] Preferably, the upper surface of the end of the collar is provided with a boss, and a recess is provided at the position of the boss. The fastening bolt slides to the position of the boss and rotates and is pressed into the recess. When the fastening bolt moves to the end position of the through groove, the nut of the fastening bolt moves up to the boss and falls into the recess. The fastening bolt is rotated and tightened. The recess constrains the fastening bolt, which improves the stability of the fastening bolt and also improves the stability of the locking rod.

[0016] Preferably, the lower end of the protective plate is chamfered, and lubricating oil is applied to the chamfered area. First, lubricating oil is applied to the protective plate. When the protective plate moves along the screw, the lubricating oil is applied to the screw, which makes it easier for the nut to be tightened on the screw later. The chamfered edge of the lower end of the protective plate increases the entrance for the screw to enter the protective plate, and the edge screw is inserted into the protective plate.

[0017] The advantages of this invention are:

[0018] 1. In this invention, the constraint force between the collar and the screw acts as a pull on the pier body, allowing the pier body to move downwards along the screw and gradually align with it, which helps the screw to align quickly and improves installation efficiency. During the lowering of the pier body, the collar moves downwards along the screw, and a notch is provided on the collar. After it is fitted onto the screw on the lower plate, the collar and the arc plate can be removed. The structure is simple and easy to disassemble and assemble.

[0019] 2. The present invention provides a protective plate inside the collar. The protective plate is made of plastic and is embedded in the slot by a locking block. When the pier body is lowered, the collar, together with the protective plate, moves relative to the screw. At this time, the protective plate slides against the surface of the screw, separating the collar from the screw and thus protecting the threads on the screw. Attached Figure Description

[0020] Figure 1 This is a perspective view of the pier body in Example 1;

[0021] Figure 2 This is a perspective view of the fit between the screw and the flange hole in Example 1;

[0022] Figure 3 This is a three-dimensional view of the fit between the pier column body and the ring body in Example 1;

[0023] Figure 4 This is a three-dimensional view of the ring in Example 1;

[0024] Figure 5 This is a first-view perspective perspective view of the collar in Example 1;

[0025] Figure 6 This is a second-view perspective perspective view of the collar in Example 1;

[0026] Figure 7 This is a three-dimensional view of the engagement between the card block and the bayonet in Embodiment 1;

[0027] Figure 8 This is a perspective view of the collar and protective plate in Example 1;

[0028] Figure 9 This is a three-dimensional view of the connection between the casting template and the pier body in Example 1;

[0029] Figure 10 This is a three-dimensional view of the casting template in Example 1.

[0030] In the diagram: 1. Pier body; 2. Flange; 201. Flange hole; 3. Upper plate; 4. Lower plate; 5. Sleeve; 6. Arc plate; 7. Ring; 8. Rod; 9. Pile foundation; 91. Screw; 10. Collar; 11. Sliding hole; 12. Locking rod; 13. Through groove; 14. Fastening bolt; 15. Bayonet; 16. Protective plate; 17. Locking block; 18. Limiting groove; 19. Limiting block; 20. Protrusion; 21. Casting template; 22. Plate; 23. Steel strip; 24. Fixing ring; 25. Sealing groove; 26. Sealing strip; 27. Boss; 28. Recess. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0032] Example 1:

[0033] Reference Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6A precast pier connection assembly includes a pier body 1, with a connecting flange 2 fitted at the lower end of the pier body 1. The connecting flange 2 includes an upper plate 3, a lower plate 4, and a sleeve 5 between the upper plate 3 and the lower plate 4. The upper plate 3 is provided with a connecting guide structure. The connecting guide structure includes two arc-shaped plates 6 arranged in half, which are fitted onto the upper plate 3. The two ends of the arc-shaped plates 6 are fixed to the upper plate 3 by bolts and form a ring 7. Multiple rods 8 are rotatably connected to the outer wall of the ring 7, and the rods 8 extend toward the pile foundation 9 on the ground. The ends of the rods 8 are rotatably connected to a notched collar 10, which is fitted onto a bolt 91 on the pile foundation 9.

[0034] In use, the pier body 1 is first suspended above the pile foundation 9 by a crane. Then, the half of the arc-shaped plate 6 is fixed to the upper plate 3. At the same time, the rod 8 and the collar 10 are rotated so that the collar 10 is fitted onto the screw 91. Multiple rods 8 and multiple collars 10 are set on the flange 2 and fitted onto the screw 91. When the pier body 1 is lowered, the constraint force between the collar 10 and the screw 91 plays a traction role on the pier body 1, so that the pier body 1 can move downward along the screw 91. At the same time, it guides the pier body 1 to gradually align with the screw 91, which helps the screw 91 to quickly align with the pier body 1 and improves the installation efficiency. During the lowering of the pier body 1, the collar 10 moves downward along the screw 91. At the same time, the collar 10 is provided with a notch. After it is fitted onto the screw 91 on the lower plate 4, the collar 10 can be removed from the screw 91 and the arc-shaped plate 6 can be removed. The structure is simple and easy to disassemble and assemble.

[0035] Reference Figure 5 and Figure 6The collar 10 has a sliding hole 11 inside, which runs along the direction of the ring body 7 and passes through both ends of the ring body 7. A ring-shaped locking rod 12 is slidably connected inside the sliding hole 11. An annular through groove 13 is formed on the upper surface of the ring body 7, which connects to the sliding hole 11. One end of the locking rod 12 is provided with a fastening bolt 14, which is threaded onto the locking rod 12 and slides along the through groove 13. The collar 10 has a notch to facilitate the removal of the collar 10 from the screw 91 later, but this also has a drawback: during the lowering of the pier body 1, the collar 10 and the screw 91 may... If the screw 91 is held in place, it may escape along the notch, thus losing the constraint between the collar 10 and the screw 91 and affecting the alignment with the screw 91. To address this, a locking rod 12 is provided. After the collar 10 is fitted onto the screw 91, the fastening bolt 14 is pushed to push the locking rod 12 out of one end of the sliding hole 11. At the same time, the end of the locking rod 12 is inserted into the other end of the sliding hole 11. The fastening bolt 14 is then tightened to stabilize the position of the locking rod 12. At this point, the collar 10 becomes a complete circle, completely enclosing the rod 8, thereby preventing the rod 8 from escaping from the collar 10 and making the subsequent installation work smoother.

[0036] Reference Figure 5 , Figure 6 , Figure 7 and Figure 8 The inner ring surface of the collar 10 has a notch 15, and a protective plate 16 is provided inside the collar 10. The protective plate 16 is cylindrical, with one side of the protective plate 16 being disconnected. A locking block 17 is provided on the outer surface of the protective plate 16, and the locking block 17 is embedded in the notch 15. The collar 10 and the locking rod 12 are made of ferrous metal to ensure their service life, but this can also damage the screw 91. The relative sliding friction between the collar 10 and the screw 91 will wear down the threads on the surface of the screw 91, which will affect the use of nuts later. When tightened, the nuts are prone to stripping between the screws 91, which seriously affects the quality of the infrastructure. To address this, a protective plate 16 is installed inside the collar 10. The protective plate 16 is made of plastic and is embedded in the slot 15 via a locking block 17. When the pier body 1 is lowered, the collar 10, together with the protective plate 16, moves relative to the screws 91. At this time, the protective plate 16 slides against the surface of the screws 91, isolating the collar 10 from the screws 91 and protecting the threads on the screws 91.

[0037] Reference Figure 6 and Figure 7The latch 15 is located on the lower end face of the collar 10 and penetrates the lower end face of the collar 10. The protective plate 16 can be reused until its surface is worn through, at which point it can no longer be used and needs to be replaced with a new one. The cooperation between the latch 17 and the latch 15 facilitates the disassembly and installation of the protective plate 16. The disconnection on one side of the protective plate 16 also facilitates the removal of the protective plate 16 from the screw 91. Considering the relative movement between the protective plate 16 and the screw 91, the friction force of the protective plate 16 on the screw 91 is upward. Therefore, when setting the position of the latch 15, it is located on the lower end face of the collar 10. In this way, when the protective plate 16 moves relative to the screw 91, the protective plate 16 can be stably kept inside the collar 10.

[0038] Reference Figure 1 , Figure 2 and Figure 3 The flange holes 201 on the upper plate 3 and the lower plate 4 are waist-shaped, with limiting grooves 18 on both sides of the flange holes 201. Limiting blocks 19 are embedded in the flange holes 201, with one end of the limiting block 19 being arc-shaped. The limiting blocks 19 have protrusions 20 on both sides, which are embedded in the limiting grooves 18. The waist-shaped flange holes 201 on the upper plate 3 and the lower plate 4 increase the inlet of the upper end of the screw 91 into the flange hole 201, which helps to install the screw 91 and the flange 2. However, this setting will affect the stability between the screw 91 and the flange 2, as the gap between the screw 91 and the flange hole 201 is too large. Therefore, limiting blocks 19 are provided in the flange holes 201. After the pier body 1 is placed on the pile foundation 9, the limiting blocks 19 are embedded one by one into the flange holes 201 to fill the gap between the screw 91 and the flange hole 201 and ensure the stability between the screw 91 and the flange 2.

[0039] Reference Figure 1 , Figure 2 and Figure 3 The limiting groove 18 on the upper plate 3 does not penetrate the upper plate 3, while the limiting groove 18 on the lower plate 4 penetrates the lower plate 4. The lower plate 4 sits directly on the upper surface of the pile foundation 9. At this time, the lower end face of the flange hole 201 of the lower plate 4 is sealed, and the limiting block 19 can be stably filled. The flange hole 201 of the upper plate 3 is set through from top to bottom. When the limiting block 19 is filled into the flange hole 201, the limiting block 19 may fall off. Therefore, the limiting groove 18 of the upper plate 3 does not penetrate the upper plate 3. After the protrusion 20 is embedded in the limiting groove 18, the protrusion 20 supports the limiting block 19 in the flange hole 201, ensuring the stability of the limiting block 19 in the flange hole 201. Then, the nut is tightened on the screw 91, and the nut squeezes the limiting block 19 into the flange hole 201.

[0040] Reference Figure 9 and Figure 10The flange 2 is fitted with a casting template 21 on its outer ring; the casting template 21 includes an arc-shaped plate 22 and a fixing ring 24 with steel bars 23; the fixing ring 24 is fitted onto the screw 91, the steel bars 23 pass through the insertion holes opened on the plate 22, and the edges of the two plates 22 are fixed together by bolts to form a ring, with the upper and lower rings stacked together; after the pier body 1 is stably placed on the pile foundation 9, the screw 91 and the upper plate 3 are tightened with nuts, and then a layer of cement protective layer is poured on the outer ring of the flange 2. A cylindrical casting template 21 is set on the outer ring of flange 2. High-strength, non-shrink cement grout is poured into the gap between the casting template 21 and flange 2, and then compacted by a vibrator. A steel strip 23 is set through the plate 22. After the pouring, the plate 22 is removed. The steel strip 23, cement and flange 2 form a whole, which improves the overall strength. At the same time, before the cement is vibrated, the steel strip 23 is tightened and fixed on the plate 22, which can improve the stability between the plate 22 and flange 2, and also improve the stability of the casting template 21 on flange 2.

[0041] Reference Figure 9 and Figure 10 The upper end face of the plate 22 is provided with a sealing groove 25, and the lower end face of the plate 22 is provided with a sealing strip 26. For two adjacent plates 22, the sealing strip 26 of the upper plate 22 is embedded in the sealing groove 25 on the lower plate 22. High-strength non-shrink cement grout is a grout made of high-strength materials as aggregates, cement as binder, and supplemented with substances with high fluidity, micro-expansion, and anti-segregation properties. The aggregate particles are small, and the grout is easy to overflow from the gaps during vibration, especially the gaps between the upper and lower plates 22. Therefore, the sealing strip 26 and the sealing groove 25 are set to improve the fit and sealing between the upper and lower plates 22 and reduce the penetration of the grout.

[0042] Reference Figure 6 The upper surface of the end of the collar 10 is provided with a boss 27, and a recess 28 is provided at the position of the boss 27. The fastening bolt 14 slides to the position of the boss 27 and rotates and is pressed into the recess 28. When the fastening bolt 14 moves to the end position of the through groove 13, the nut of the fastening bolt 14 moves up to the boss 27 and falls into the recess 28. The fastening bolt 14 is rotated and tightened. The recess 28 constrains the fastening bolt 14, which improves the stability of the fastening bolt 14 and also improves the stability of the locking rod 12.

[0043] Example 2:

[0044] Compared with Embodiment 1, as another embodiment of the present invention, the lower end of the protective plate 16 is provided with a chamfer, and the chamfer position is coated with lubricating oil; firstly, lubricating oil is provided on the protective plate 16, and when the protective plate 16 moves along the screw 91, the lubricating oil is applied to the screw 91, which facilitates the tightening of the nut on the screw 91 later. The chamfer on the lower edge of the protective plate 16 increases the entrance of the screw 91 into the protective plate 16, and the edge screw 91 is inserted into the protective plate 16.

[0045] Working principle: In use, the pier body 1 is first suspended above the pile foundation 9 by a crane. Then, the half of the arc-shaped plate 6 is fixed to the upper plate 3. At the same time, the rod 8 and the collar 10 are rotated so that the collar 10 is fitted onto the screw 91. Multiple rods 8 and multiple collars 10 are set on the flange 2 and fitted onto the screw 91. When the pier body 1 is lowered, the constraint force between the collar 10 and the screw 91 plays a traction role on the pier body 1, so that the pier body 1 can move downward along the screw 91. At the same time, it guides the pier body 1 to gradually align with the screw 91, which helps the screw 91 to quickly align with the pier body 1 and improves the installation efficiency. During the lowering of the pier body 1, the collar 10 moves downward along the screw 91. At the same time, the collar 10 is provided with a notch. After it is fitted onto the screw 91 on the lower plate 4, the collar 10 can be removed from the screw 91 and the arc-shaped plate 6 can be removed. The structure is simple and easy to disassemble and assemble.

[0046] The collar 10 has a notch to facilitate its removal from the screw 91 later. However, this also has a drawback: during the lowering of the pier body 1, the collar 10 and screw 91 are held together by tension, and the screw 91 may escape along the notch, thus losing the constraint between the collar 10 and screw 91 and affecting the alignment with the screw 91. To address this, a locking rod 12 is provided. After the collar 10 is fitted onto the screw 91, the fastening bolt 14 is pushed to push the locking rod 12 out of one end of the sliding hole 11. At the same time, the end of the locking rod 12 is inserted into the other end of the sliding hole 11. The fastening bolt 14 is then tightened to stabilize the position of the locking rod 12. At this point, the collar 10 becomes a complete circle, completely enclosing the rod body 8, thus preventing the rod body 8 from escaping from the collar 10 and making the subsequent installation work smoother.

[0047] The collar 10 and locking rod 12 are made of ferrous metal to ensure their service life, but they can also damage the screw 91. The relative sliding friction between the collar 10 and the screw 91 will wear down the threads on the surface of the screw 91. When tightening the nut later, the nut is prone to stripping between the screw 91 threads, which seriously affects the quality of the infrastructure. Therefore, a protective plate 16 is installed inside the collar 10. The protective plate 16 is made of plastic and is embedded in the slot 15 through the locking block 17. When the pier body 1 is lowered, the collar 10 and the protective plate 16 move relative to the screw 91. At this time, the protective plate 16 slides against the surface of the screw 91, separating the collar 10 and the screw 91 and protecting the threads on the screw 91.

[0048] The protective plate 16 can be reused until its surface is worn through, at which point it can no longer be used and needs to be replaced with a new one. The engagement of the locking block 17 and the locking slot 15 facilitates the disassembly and installation of the protective plate 16. The disconnection on one side of the protective plate 16 also facilitates its removal from the screw 91. Considering the relative movement between the protective plate 16 and the screw 91, the frictional force of the protective plate 16 against the screw 91 is upward. Therefore, when setting the position of the locking slot 15, it is located on the lower end face of the collar 10. This way, when the protective plate 16 moves relative to the screw 91, it can be stably kept within the collar 10.

[0049] The flange holes 201 on the upper plate 3 and the lower plate 4 are waist-shaped, which increases the inlet of the upper end of the screw 91 into the flange hole 201 and helps to install the screw 91 and the flange 2. However, this setting will affect the stability between the screw 91 and the flange 2, and the gap between the screw 91 and the flange hole 201 is too large. Therefore, a limiting block 19 is provided in the flange hole 201. After the pier body 1 is placed on the pile foundation 9, the limiting blocks 19 are inserted into the flange holes 201 one by one to fill the gap between the screw 91 and the flange hole 201 and ensure the stability between the screw 91 and the flange 2.

[0050] The lower plate 4 sits directly on the upper surface of the pile foundation 9. At this time, the lower end face of the flange hole 201 of the lower plate 4 is sealed, and the limiting block 19 can be stably filled. The flange hole 201 of the upper plate 3 is set through from top to bottom. When the limiting block 19 is filled into the flange hole 201, the limiting block 19 may fall off. Therefore, the limiting groove 18 of the upper plate 3 is not set through the upper plate 3. After the protrusion 20 is embedded in the limiting groove 18, the protrusion 20 supports the limiting block 19 in the flange hole 201, ensuring the stability of the limiting block 19 in the flange hole 201. Then, the nut is tightened on the screw 91, and the nut squeezes the limiting block 19 into the flange hole 201.

[0051] After the pier body 1 is stably placed on the pile foundation 9, the bolt 91 and the upper plate 3 are tightened with nuts. Then, a layer of cement protective layer is poured on the outer ring of the flange 2. A cylindrical pouring template 21 is set on the outer ring of the flange 2, and high-strength non-shrink cement grout is poured into the gap between the pouring template 21 and the flange 2. Then, it is compacted by a vibrator. The steel strip 23 is set through the plate 22. After pouring, the plate 22 is removed. The steel strip 23, cement and flange 2 form a whole, which improves the overall strength. At the same time, before the cement is vibrated, the steel strip 23 is tightened and fixed on the plate 22, which can improve the stability between the plate 22 and the flange 2, and also improve the stability of the pouring template 21 on the flange 2.

[0052] High-strength, non-shrink cement grout is a type of grout made with high-strength materials as aggregates, cement as a binder, and supplemented with substances that promote high fluidity, micro-expansion, and anti-segregation. The aggregate particles are relatively small, making it easy for the grout to overflow from gaps during vibration, especially between the upper and lower plates 22. Therefore, a sealing strip 26 and a sealing groove 25 are installed to improve the sealing between the upper and lower plates 22 and reduce grout penetration. When the fastening bolt 14 moves to the end of the groove, the nut of the fastening bolt 14 moves up to the boss 27 and falls into the recess 28. Rotating the fastening bolt 14 tightens it, and the recess 28 restrains the fastening bolt 14, improving its stability and also enhancing the stability of the locking rod 12.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A prefabricated pier column connecting assembly, comprising a pier column body (1), a connecting flange (2) is sleeved at the lower end of the pier column body (1), the connecting flange (2) comprises an upper disc body (3), a lower disc body (4) and a sleeve (5) between the upper disc body (3) and the lower disc body (4); characterized in that: The upper plate (3) is provided with a connecting guide structure; the connecting guide structure includes two arc-shaped plates (6) arranged in half, the arc-shaped plates (6) are sleeved on the upper plate (3), and the two ends of the arc-shaped plates (6) are fixed to the upper plate (3) by bolts, forming a ring (7); multiple rods (8) are rotatably connected to the outer wall of the ring (7), and the rods (8) extend to the pile foundation (9) on the ground; the ends of the rods (8) are rotatably connected to a collar (10) with a notch, and the collar (10) is sleeved on the screw (91) on the pile foundation (9); The collar (10) has a sliding hole (11) inside, which is opened along the direction of the collar (10). The sliding hole (11) passes through both ends of the collar (10). A ring-shaped locking rod (12) is slidably connected inside the sliding hole (11). An annular through groove (13) is opened on the upper surface of the collar (10), which is connected to the sliding hole (11). One end of the locking rod (12) is provided with a fastening bolt (14), which is threaded onto the locking rod (12) and slides along the direction of the through groove (13).

2. The precast pier connection assembly according to claim 1, characterized in that: The inner ring surface of the collar (10) has a slot (15), and a protective plate (16) is provided inside the collar (10). The protective plate (16) is cylindrical, and one side of the protective plate (16) is disconnected. A locking block (17) is provided on the outer surface of the protective plate (16), and the locking block (17) is embedded in the slot (15).

3. A precast pier connection assembly according to claim 2, characterized in that: The notch (15) is located on the lower end face of the collar (10) and penetrates the lower end face of the collar (10).

4. A precast pier connection assembly according to claim 1, characterized in that: The outer ring of the connecting flange (2) is fitted with a casting template (21); the casting template (21) includes an arc-shaped plate (22) and a fixing ring (24) with a steel strip (23); the fixing ring (24) is fitted on the screw (91), the steel strip (23) passes through the insertion hole opened on the plate (22), the edges of the two plates (22) are fixed by bolts and form a ring, and the upper and lower rings are stacked together.

5. A precast pier connection assembly according to claim 4, characterized in that: A sealing groove (25) is provided on the upper end face of the plate (22), and a sealing strip (26) is provided on the lower end face of the plate (22). For two adjacent plates (22), the sealing strip (26) of the upper plate (22) is embedded in the sealing groove (25) on the lower plate (22).

6. A precast pier connection assembly according to claim 3, characterized in that: The upper surface of the end of the collar (10) is provided with a boss (27), and a recess (28) is provided at the position of the boss (27). The fastening bolt (14) slides to the position of the boss (27) and rotates and presses into the recess (28).

7. A precast pier connection assembly according to claim 2, characterized in that: The lower end of the protective plate (16) is chamfered, and the chamfered area is coated with lubricating oil.

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