Preparation method of end plate of prestressed concrete pipe pile and pile splicing structure

Abstract

The invention provides an end plate preparation method of a prestressed concrete pipe pile and a pile splicing structure. The end plate preparation method comprises the steps that a center hole is machined in the middle of a base plate; a plurality of anchoring holes are machined in the base plate, so that a protrusion is formed on the periphery of each anchoring hole in the second side face of the base plate; the base plate with the multiple anchoring holes machined is leveled; a rib passing hole and a tensioning hole are machined in the side portion of each anchoring hole; a welding groove is machined in the periphery of the first side face of the substrate. By adopting the method, the flatness and the size precision of an end plate product can be ensured, the product quality is improved, and the service life of the end plate is ensured. In the pile splicing structure, the upper end plate and the lower end plate are manufactured through the end plate manufacturing method, the upper end main rib and the lower end main rib are clamped into the anchoring hole of the upper end plate and the anchoring hole of the lower end plate correspondingly, the upper end plate and the lower end plate are connected in a three-layer full welding mode, and the pile splicing positioning precision and the connecting stability can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated pile processing, and in particular to an end plate preparation method of a prestressed concrete pipe pile and a pile connection structure. Background Art

[0002] Prestressed concrete pipe pile is a tubular slender member driven into the soil with a cross-sectional size much smaller than its length. The upper part of the pipe pile is connected to the cap (beam) to form a pile foundation. Its foundation structure is a prestressed concrete structure, which can be divided into post-tensioned prestressed pipe piles and pre-tensioned prestressed pipe piles. It has the characteristics of large bearing capacity, good stability, small settlement value, etc., and can be mechanized, which greatly improves the construction progress.

[0003] Due to the limitations of the materials and transportation conditions of pipe piles, multiple pipe piles need to be connected during pipe pile construction. End plates are components installed at both ends of prestressed concrete pipe piles. They are mainly used for anchoring prestressed tensioned steel bars in pipe pile production and for connecting piles during construction. In the current end plate processing, the holes on the end plate are formed by one-time stamping. After the end plate is impacted, it is easy to cause the end plate to be uneven, affecting the processing accuracy of the product. In the subsequent pile connection construction, the end plate positioning is inconvenient and the end plate is unevenly stressed, affecting the stability of the pile connection and the service life of the end plate. Summary of the invention

[0004] One purpose of the present invention is to solve the shortcomings of the prior art and to propose a method for preparing an end plate of a prestressed concrete pipe pile to ensure the flatness and dimensional accuracy of the end plate.

[0005] The second purpose of the present invention is to solve the shortcomings of the prior art and to propose a prestressed concrete pipe pile connection structure to improve the positioning accuracy and connection stability of the connection piles and extend the service life of the end plate.

[0006] To achieve the above object, the present invention adopts the following technical solutions: According to a first aspect of the present invention, a method for preparing an end plate of a prestressed concrete pipe pile is provided, the method comprising: Step S1: providing a square substrate, wherein the substrate has a first side surface and a second side surface, and processing a center hole in the middle of the substrate so that the center hole passes through from the first side surface to the second side surface; Step S2: placing the substrate with the center hole processed on a stamping die, processing a plurality of anchor holes on the substrate, and forming a bulge around each anchor hole on the second side surface; wherein the plurality of anchor holes are arranged in a square shape, and the distances between adjacent anchor holes are equal; Step S3: leveling the substrate after processing the plurality of anchor holes; Step S4: machining a rib hole and a tensioning hole on the side of each anchor hole; wherein the rib hole is connected between the corresponding anchor hole and the tensioning hole, and the center line of the corresponding anchor hole and the tensioning hole is parallel to at least one side of the substrate; Step S5: Processing a welding groove on the periphery of the first side surface of the substrate to obtain an end plate product; wherein the welding groove has an arcuate groove wall and a beveled groove wall, the arcuate groove wall is connected to the first side surface, and the beveled groove wall is arranged between the arcuate groove wall and the outer peripheral wall of the end plate.

[0007] Preferably, the stamping die comprises a lower die base and an upper die base, a positioning column is provided in the middle of the lower die base, and the structure of the positioning column matches the structure of the center hole; a plurality of die holes arranged in a square are provided around the positioning column, and the distances between adjacent die holes are equal; a positioning block is also provided on the lower die base, and the structure of the positioning block matches the outer contour structure of the substrate; a plurality of anchor hole punches are provided on the upper die base, and the plurality of anchor hole punches correspond to the plurality of die holes respectively; when processing a plurality of anchor holes, the second side surface of the substrate is placed downward on the lower die base, the positioning column enters the center hole, the edge of the substrate abuts against the positioning block, and the positioning block positions the substrate; the upper die base is pressed downward, driving the plurality of anchor hole punches to be pressed downward, thereby processing a plurality of anchor holes on the substrate.

[0008] Preferably, the anchor hole punch includes a first section and a second section, the first section is arranged above the second section, the outer diameter of the first section is larger than the outer diameter of the second section, and a bevel transition is adopted between the first section and the second section; in the end plate product, a countersunk groove is provided at one end of the anchor hole corresponding to the first side surface, the inner diameter of the countersunk groove is larger than the inner diameter of the anchor hole, and the countersunk groove and the anchor hole are connected by a bevel.

[0009] Preferably, the die hole includes an arc-shaped countersunk hole and a circular countersunk hole, the circular countersunk hole is located below the arc-shaped countersunk hole, the arc-shaped countersunk hole is used to form the protrusion, and the structure of the circular countersunk hole matches the structure of the second section body.

[0010] Preferably, the ratio of the maximum height of the protrusion protruding from the second side surface to the thickness of the end plate product is 0.40-0.50.

[0011] Preferably, the rib holes and the tensioning holes are formed by stamping or cutting.

[0012] Preferably, the method for preparing the end plate of the prestressed concrete pipe pile further comprises: step S6: machining a sealing groove on the outer peripheral wall of the end plate, and installing a sealing ring in the sealing groove.

[0013] According to a second aspect of the present invention, there is provided a prestressed concrete pipe pile connection structure, which comprises an upper section pile, a lower connection pile, an upper main reinforcement, a lower main reinforcement, an upper end plate and a lower end plate, wherein the upper end plate and the lower end plate are respectively made by the end plate preparation method of the prestressed concrete pipe pile as described above; the first side surface of the upper end plate is fitted with the first side surface of the lower end plate, the upper end plate and the lower end plate are welded and connected by welding material, and the welding material is filled in the welding groove of the upper end plate and the lower end plate; the second side surface of the upper end plate The upper section pile is connected, and the second side surface of the lower end plate is connected to the lower section pile; the upper end main reinforcement is arranged in the upper section pile, and the bottom of the upper end main reinforcement is provided with a first pier head, and the first pier head penetrates into the corresponding tensioning hole from the second surface of the upper end plate and passes through the corresponding reinforcement hole and then snaps into the corresponding anchor hole; the lower end main reinforcement is arranged in the lower section pile, and the top of the lower end main reinforcement is provided with a second pier head, and the second pier head penetrates into the corresponding tensioning hole from the second side surface of the lower end plate and passes through the corresponding reinforcement hole and then snaps into the corresponding anchor hole.

[0014] Preferably, the welding material is welded in the welding grooves of the upper end plate and the lower end plate by a three-layer full welding method, and the welding material includes a first material body, a second material body and a third material body connected in sequence from the inside to the outside, and the outer side of the third material body protrudes from the outer peripheral walls of the upper end plate and the lower end plate; a first connecting surface is formed between the first material body and the second material body, and a second connecting surface is formed between the second material body and the third material body, an acute angle exists between the first connecting surface and the central axis of the upper end plate, an acute angle exists between the second connecting surface and the central axis of the upper end plate, and an acute angle exists between the first connecting surface and the second connecting surface.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the end plate preparation method of the present invention, the base plate is leveled after the anchor holes are processed, the rib holes and the tensioning holes are processed, and finally the welding grooves are processed, which can ensure the flatness and dimensional accuracy of the end plate products, improve product quality, and ensure the service life of the end plate.

[0016] In the pile connection structure of the present invention, the upper end plate and the lower end plate are made by the above-mentioned end plate preparation method, the upper end main reinforcement and the lower end main reinforcement are respectively clamped into the anchor holes of the upper end plate and the anchor holes of the lower end plate, and the upper end plate and the lower end plate are connected by welding, which can improve the positioning accuracy and connection stability of the pile connection, and the end plate is subjected to more uniform force, thereby extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A flow chart of a method for preparing an end plate according to some embodiments of the present invention; Figure 2 It is a schematic structural diagram of an end plate product according to some embodiments of the present invention; Figure 3 It is a cross-sectional view of an end plate product according to some embodiments of the present invention; Figure 4 for Figure 3 A magnified view of the structure at center A; Figure 5 Schematic diagram of the structure of anchor holes, reinforcement holes and tensioning holes in some embodiments of the present invention; Figure 6 for Figure 5 Cross-sectional view of the middle cigarette in the BB direction; Figure 7 for Figure 5 Cross-sectional view along CC direction; Figure 8 It is a schematic diagram of the structure of a stamping die in some embodiments of the present invention; Fig. 9 It is a schematic structural diagram of a lower die seat in a stamping die in some embodiments of the present invention; Fig.10 It is a schematic diagram of the structure of an upper die seat in a stamping die in some embodiments of the present invention; Fig.11 Schematic diagram of the structure of the pile connection structure of some embodiments of the present invention.

[0018] In the figure, 10-end plate, 11-first side, 12-second side, 13-center hole, 14-anchor hole, 141-sunk groove, 15-protrusion, 16-rib hole, 17-tensioning hole, 18-welding groove, 181-arc groove wall, 182-inclined groove wall, 19-sealing groove; 20-stamping die, 21-lower die seat, 211-positioning column, 212-die hole, 2121-arc-shaped countersunk hole, 2122 -circular countersunk hole, 213-positioning block, 22-upper die seat, 221-anchor hole punch, 2211-first section, 2212-second section; 30-upper section pile, 40-lower section pile, 50-upper end main reinforcement, 51-first pier head, 60-lower end main reinforcement, 61-second pier head, 70-upper end plate, 80-lower end plate, 90-welding material, 91-first material body, 92-second material body, 93-third material body. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention. It can be understood that some technical means of the various embodiments described herein can be replaced or combined with each other without conflict.

[0020] In the description of the present invention, if there are terms such as "first", "second", etc., they are only used to distinguish the objects described, and do not have any order or technical meaning. Therefore, the objects defined as "first", "second", etc. may explicitly or implicitly include one or more of the objects. In addition, "one" or "a" and similar words do not indicate a quantity limitation, but indicate the existence of at least one, and "multiple" means not less than two.

[0021] In the description of the present specification, reference to "one embodiment" or "some embodiments" etc. means that one or more embodiments of the present invention include a specific feature, structure or characteristic described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0022] According to a first aspect of the present invention, a method for preparing an end plate of a prestressed concrete pipe pile is provided. Figure 1 In some embodiments, the method for preparing the end plate of the prestressed concrete pipe pile includes: Step S1: providing a square substrate, the substrate having a first side surface 11 and a second side surface 12, processing a center hole 13 in the middle of the substrate, such that the center hole 13 penetrates from the first side surface 11 to the second side surface 12; Step S2: placing the substrate with the center hole 13 processed thereon on the stamping die 20, processing a plurality of anchor holes 14 on the substrate, and forming a protrusion 15 around each anchor hole 14 on the second side surface 12; wherein the plurality of anchor holes 14 are arranged in a square shape, and the distances between adjacent anchor holes 14 are equal; Step S3: leveling the substrate after processing the plurality of anchor holes 14; Step S4: machining a rib hole 16 and a tensioning hole 17 on the side of each anchor hole 14; wherein the rib hole 16 is connected between the corresponding anchor hole 14 and the tensioning hole 16, and the center line of the corresponding anchor hole 14 and the tensioning hole 16 is parallel to at least one side of the substrate; Step S5: Processing a welding groove 18 on the periphery of the first side surface 11 of the substrate to obtain an end plate 10 product; wherein, referring to Figure 4 The welding groove 18 has an arcuate groove wall 181 and an inclined groove wall 182 . The arcuate groove wall 181 is connected to the first side surface 11 , and the inclined groove wall 182 is disposed between the arcuate groove wall 181 and the outer peripheral wall of the end plate 10 .

[0023] Reference Figures 2 to 7The end plate 10 manufactured by the above-mentioned preparation method has a first side surface 11 and a second side surface 12 opposite to each other. A central hole 13 is provided in the middle of the end plate 10, and the central hole 13 passes through from the first side surface 11 to the second side surface 12. A plurality of anchor holes 14 are provided on the end plate 10, and the plurality of anchor holes 14 are arranged in a square shape. The distances between adjacent anchor holes 14 are equal, and a protrusion 15 is formed around each anchor hole 14 on the second side surface 12. A rib hole 16 and a tensioning hole 17 are connected to the side of each anchor hole 14, and the rib hole 16 and the tensioning hole 17 pass through from the first side surface 11 to the second side surface 12 respectively; the center line connecting the corresponding anchor hole 14 and the tensioning hole 17 is parallel to at least one side edge of the end plate 10. A welding groove 18 is provided on the periphery of the first side surface 11, so as to facilitate the welding connection of adjacent end plates during pile connection construction. The welding groove 18 has an arcuate groove wall 181 and an inclined groove wall 182 . The arcuate groove wall 181 is connected to the first side surface 11 , and the inclined groove wall 182 is disposed between the arcuate groove wall 181 and the outer peripheral wall of the end plate 10 .

[0024] In the above end plate preparation method, the base plate is leveled after the anchor holes are processed, and then the reinforcement holes and tensioning holes are processed, and finally the welding grooves are processed, which can ensure the flatness and dimensional accuracy of the end plate products, improve product quality, ensure the service life of the end plate, and facilitate pile connection operations.

[0025] In some embodiments, the center hole 13 is a circular hole, and the center hole 13 can be processed by stamping or cutting. The size of the center hole 13 can be reasonably set according to actual conditions. For example, in some embodiments, the ratio of the inner diameter of the center hole to the side length of the end plate is 0.45 to 0.68.

[0026] Reference Figures 8 to 10 In some preferred embodiments, the stamping die 20 includes a lower die base 21 and an upper die base 22. A positioning column 211 is provided in the middle of the lower die base 21. The positioning column 211 protrudes from the surface of the lower die base 21. The structure of the positioning column 211 matches the structure of the center hole 13. If the center hole 13 is a round hole, the positioning column 211 is a cylindrical structure. A plurality of die holes 212 arranged in a square are provided around the positioning column 211, and the distances between adjacent die holes 212 are equal. A positioning block 213 is also provided on the lower die base 21. The structure of the positioning block 213 matches the outer contour structure of the substrate. A plurality of anchor hole punches 221 are provided on the upper die base 22. The plurality of anchor hole punches 221 correspond to the plurality of die holes 212, respectively. When processing multiple anchor holes 14, the second side of the substrate is placed downward on the lower die seat 21, the positioning column 211 enters the center hole 13, the edge of the substrate abuts against the positioning block 213, and the positioning block 213 positions the substrate; the upper die seat 21 is pressed down, driving the multiple anchor hole punches 221 to be pressed down, thereby processing multiple anchor holes 14 on the substrate.

[0027] Further, refer to Figure 8 The anchor hole punch 221 includes a first segment 2211 and a second segment 2212. The first segment 2211 is arranged above the second segment 2212. The outer diameter of the first segment 2211 is greater than the outer diameter of the second segment 2212. An inclined surface transition is used between the first segment 2211 and the second segment 2212. In this way, in the manufactured end plate 10 product, a sink groove 141 is provided at one end of the anchor hole 14 corresponding to the first side surface 11. The inner diameter of the sink groove 141 is greater than the inner diameter of the anchor hole 14. The sink groove 141 and the anchor hole 14 are connected by an inclined surface.

[0028] Correspondingly, the die hole 212 includes an arcuate countersunk hole 2121 and a circular countersunk hole 2122. The circular countersunk hole 2122 is located below the arcuate countersunk hole 2121. The arcuate countersunk hole 2121 is used to form the protrusion 15 of the second side surface 12 of the end plate 10. The structure of the circular countersunk hole 2122 matches the structure of the second section 2212.

[0029] It should be noted that the sizes of the anchor hole 14, the recessed groove 141, and the protrusion 15 can be reasonably set according to the actual situation. For example, in some preferred embodiments, the ratio of the inner diameter of the recessed groove 141 to the inner diameter of the anchor hole 14 is 1.5-2.0, and the ratio of the maximum height of the protrusion 15 protruding from the second side surface 12 to the product thickness of the end plate 10 is 0.40-0.50. Among them, the thickness of the end plate 10 corresponds to the distance between the first side surface 11 and the second side surface 12. For example, in one embodiment, the inner diameter of the recessed groove 141 is 16 mm, the inner diameter of the anchor hole 14 is 8 mm, the maximum height of the protrusion 15 protruding from the second side surface 12 is 7 mm, and the thickness of the end plate 10 is 16 mm; in another embodiment, the inner diameter of the recessed groove 141 is 22 mm, the inner diameter of the anchor hole 14 is 14 mm, the maximum height of the protrusion 15 protruding from the second side surface 12 is 10 mm, and the thickness of the end plate is 22 mm.

[0030] In some preferred embodiments, during the leveling operation, an auxiliary plate can be used to support the substrate, and a groove that matches the multiple protrusions on the second side of the substrate is provided on the auxiliary plate to form an air avoidance structure. The auxiliary plate and the substrate are then sent as a whole between the upper and lower rows of leveling rollers, so that the upper and lower rows of leveling rollers are used to level the substrate to improve the flatness of the substrate.

[0031] Preferably, the rib holes 16 and the tension holes 17 are processed by stamping or cutting. In some embodiments, the rib holes 16 and the tension holes 17 are processed by cutting. During the cutting operation, the substrate can be placed on a cutting machine, and a limit column that matches the multiple anchor holes 14 is set on the cutting machine. The substrate is positioned by the cooperation between the limit column and the anchor hole 14, thereby ensuring the processing accuracy and improving the product quality. In other embodiments, the rib holes 16 and the tension holes 17 are processed by stamping. After the stamping is completed, the substrate is leveled to ensure the flatness of the substrate.

[0032] In some preferred embodiments, the method for preparing the end plate of the prestressed concrete pipe pile further includes: step S6: machining a sealing groove 19 on the outer peripheral wall of the end plate 10, and installing a sealing ring 191 in the sealing groove 19. Figure 4 The sealing groove 191 is arranged around the outer peripheral wall of the end plate 10. The cross section of the sealing groove 191 can be semicircular, rectangular, trapezoidal, etc. The sealing ring 191 can be made of plastic, cotton rope, tape, etc.

[0033] According to a second aspect of the present invention, a prestressed concrete pipe pile connection structure is provided, referring to Fig.11 The connection structure of the prestressed concrete pipe pile includes an upper section pile 30, a lower connection pile 40, an upper main reinforcement 50, a lower main reinforcement 60, an upper end plate 70 and a lower end plate 80. The upper end plate 70 and the lower end plate 80 are respectively made by the end plate preparation method of the prestressed concrete pipe pile as described above. The upper end plate 70 is arranged opposite to the lower end plate 80, and the first side surface of the upper end plate 70 is fitted with the first side surface of the lower end plate 80. The upper end plate 70 and the lower end plate 80 are welded and connected by welding material 90, and the welding material 90 is filled in the welding groove of the upper end plate 70 and the lower end plate 80. The second side surface of the upper end plate 70 is connected to the upper section pile 30, and the second side surface of the lower end plate 80 is connected to the lower section pile 40. The upper main reinforcement 50 is arranged in the upper section pile 30, and the bottom of the upper main reinforcement 50 is provided with a first pier head 51. The first pier head 51 penetrates the corresponding tensioning hole from the second side surface of the upper end plate 30 and is inserted into the corresponding anchor hole after passing through the corresponding reinforcement hole. The lower main reinforcement 60 is arranged in the lower section pile 40, and a second pier head 61 is provided on the top of the lower main reinforcement 60. The second pier head 61 penetrates into the corresponding tensioning hole from the second side surface of the lower end plate 80 and passes through the corresponding reinforcement hole and then is inserted into the corresponding anchor hole.

[0034] A protrusion is provided on the second side surface of the upper end plate 70 corresponding to the periphery of the anchor hole, and the protrusion can be tightly combined with the upper section pile 30 to enhance the connection strength and stability between the upper end plate 70 and the upper section pile 30. A protrusion is provided on the second side surface of the lower end plate 80 corresponding to the periphery of the anchor hole, and the protrusion can be tightly combined with the lower section pile 40 to enhance the connection strength and stability between the lower end plate 80 and the lower section pile 40.

[0035] The anchor hole on the upper end plate 70 is provided with a recessed groove corresponding to one end of the first side thereof, and the structure of the recessed groove matches the structure of the first pier head 51. When the upper main reinforcement 50 is clamped, the first pier head 51 is clamped into the recessed groove, thereby ensuring the positioning accuracy and connection firmness of the upper end plate 70 and the upper section pile 30. The anchor hole on the lower end plate 80 is provided with a recessed groove corresponding to one end of the first side thereof, and the structure of the recessed groove matches the structure of the second pier head 61. When the lower main reinforcement 60 is clamped, the first pier head 61 is clamped into the recessed groove, thereby ensuring the positioning accuracy and connection firmness of the lower end plate 80 and the lower section pile 40.

[0036] In some preferred embodiments, the welding material 90 can be made of copper alloy or other materials. The welding material 90 is welded in the welding groove of the upper end plate 70 and the lower end plate 80 by three-layer full welding, which can improve the connection stability of the upper and lower end plates and extend the service life of the pipe pile. Specifically, the welding material 90 includes a first material body 91, a second material body 92 and a third material body 93 connected in sequence from the inside to the outside (from the central axis of the end plate to the outer peripheral wall of the end plate), and the outer side of the third material body 93 protrudes from the outer peripheral wall of the upper end plate 70 and the lower end plate 80. A first connecting surface is formed between the first material body 91 and the second material body 92, and a second connecting surface is formed between the second material body 92 and the third material body 93. There is an acute angle between the first connecting surface and the central axis of the upper end plate 70, an acute angle between the second connecting surface and the central axis of the upper end plate 70, and an acute angle between the first connecting surface and the second connecting surface. Since the welding groove 18 of the end plate 10 has an arcuate groove wall 181 and an inclined groove wall 182, the arcuate groove wall 181 is connected to the first side surface 11, and the inclined groove wall 182 is arranged between the arcuate groove wall 181 and the outer peripheral wall of the end plate 10, the welding material 90 has a structure that gradually thickens from the inside to the outside. In this way, the welding operation is convenient and the welding strength between the upper and lower end plates can be guaranteed, thereby extending the service life of the pipe pile.

[0037] In some other embodiments, a clamp (not shown in the figure) can be installed on the outside of the upper end plate 70 and the lower end plate 80. The clamp is connected to the upper end plate 70 and the lower end plate 80 by bolts respectively. The sealing ring on the outer peripheral wall of the upper end plate 70 and the lower end plate 80 can fit tightly against the inner wall of the clamp, thereby enhancing the sealing of the pipe pile connection.

[0038] In the end plate preparation method of the prestressed concrete pipe pile of the present invention, the base plate is leveled after the anchor hole is processed, and then the reinforcement hole and the tensioning hole are processed, and finally the welding groove is processed, which can ensure the flatness and dimensional accuracy of the end plate product, improve the product quality, and ensure the service life of the end plate. In the pile connection structure of the present invention, the upper end plate and the lower end plate are made by the above-mentioned end plate preparation method, and the upper end main reinforcement and the lower end main reinforcement are respectively clamped into the anchor hole of the upper end plate and the anchor hole of the lower end plate. The upper end plate and the lower end plate are connected by welding, which can improve the positioning accuracy and connection stability of the pile connection, and the end plate is more evenly stressed, thereby extending its service life.

[0039] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A method for preparing an end plate of a prestressed concrete pipe pile, characterized in that: The method for preparing the end plate of the prestressed concrete pipe pile comprises: Step S1: providing a square substrate, wherein the substrate has a first side surface and a second side surface, and processing a center hole in the middle of the substrate so that the center hole passes through from the first side surface to the second side surface; Step S2: placing the substrate with the center hole processed on a stamping die, processing a plurality of anchor holes on the substrate, and forming a bulge around each anchor hole on the second side surface; wherein the plurality of anchor holes are arranged in a square shape, and the distances between adjacent anchor holes are equal; Step S3: leveling the substrate after processing the plurality of anchor holes; Step S4: machining a rib hole and a tensioning hole on the side of each anchor hole; wherein the rib hole is connected between the corresponding anchor hole and the tensioning hole, and the center line of the corresponding anchor hole and the tensioning hole is parallel to at least one side of the substrate; Step S5: Processing a welding groove on the periphery of the first side surface of the substrate to obtain an end plate product; wherein the welding groove has an arcuate groove wall and a beveled groove wall, the arcuate groove wall is connected to the first side surface, and the beveled groove wall is arranged between the arcuate groove wall and the outer peripheral wall of the end plate.

2. The method for preparing the end plate of the prestressed concrete pipe pile according to claim 1, characterized in that: The stamping die comprises a lower die seat and an upper die seat, a positioning column is provided in the middle of the lower die seat, and the structure of the positioning column matches the structure of the center hole; a plurality of die holes arranged in a square are provided around the positioning column, and the distances between adjacent die holes are equal; a positioning block is also provided on the lower die seat, and the structure of the positioning block matches the outer contour structure of the substrate; a plurality of anchor hole punches are provided on the upper die seat, and the plurality of anchor hole punches correspond to the plurality of die holes respectively; when processing a plurality of anchor holes, the second side surface of the substrate is placed downward on the lower die seat, the positioning column enters the center hole, the edge of the substrate abuts against the positioning block, and the positioning block positions the substrate; the upper die seat is pressed downward, driving the plurality of anchor hole punches to be pressed downward, thereby processing a plurality of anchor holes on the substrate.

3. The method for preparing the end plate of the prestressed concrete pipe pile according to claim 2, characterized in that: The anchor hole punch includes a first section and a second section, the first section is arranged above the second section, the outer diameter of the first section is larger than the outer diameter of the second section, and a bevel transition is adopted between the first section and the second section; in the end plate product, a countersunk groove is provided at one end of the anchor hole corresponding to the first side surface, the inner diameter of the countersunk groove is larger than the inner diameter of the anchor hole, and the countersunk groove and the anchor hole are connected by a bevel.

4. The method for preparing the end plate of the prestressed concrete pipe pile according to claim 3, characterized in that: The die hole includes an arc-shaped countersunk hole and a circular countersunk hole. The circular countersunk hole is located below the arc-shaped countersunk hole. The arc-shaped countersunk hole is used to form the protrusion. The structure of the circular countersunk hole matches the structure of the second section body.

5. The method for preparing the end plate of the prestressed concrete pipe pile according to claim 1, characterized in that: The ratio of the maximum height of the protrusion protruding from the second side surface to the thickness of the end plate product is 0.40 to 0.

50.

6. The method for preparing the end plate of the prestressed concrete pipe pile according to claim 1, characterized in that: The rib holes and the tensioning holes are formed by punching or cutting.

7. The method for preparing the end plate of the prestressed concrete pipe pile according to claim 1, characterized in that: The method for preparing the end plate of the prestressed concrete pipe pile further comprises: step S6: machining a sealing groove on the outer peripheral wall of the end plate, and installing a sealing ring in the sealing groove.

8. A prestressed concrete pipe pile connection structure, characterized in that: The invention comprises an upper section pile, a lower connecting pile, an upper main reinforcement, a lower main reinforcement, an upper end plate and a lower end plate, wherein the upper end plate and the lower end plate are respectively made by the end plate preparation method of the prestressed concrete pipe pile according to any one of claims 1 to 7; the first side surface of the upper end plate is fitted with the first side surface of the lower end plate, the upper end plate and the lower end plate are welded and connected by welding material, and the welding material is filled in the welding groove of the upper end plate and the lower end plate; the second side surface of the upper end plate is connected to the upper section pile, and the second side surface of the lower end plate is connected to the lower section pile; the upper main reinforcement is arranged in the upper section pile, and the bottom of the upper main reinforcement is provided with a first pier head, and the first pier head penetrates from the second surface of the upper end plate into the corresponding tensioning hole and passes through the corresponding reinforcement hole and then is clamped into the corresponding anchor hole; the lower main reinforcement is arranged in the lower section pile, and the top of the lower main reinforcement is provided with a second pier head, and the second pier head penetrates from the second side surface of the lower end plate into the corresponding tensioning hole and passes through the corresponding reinforcement hole and then is clamped into the corresponding anchor hole.

9. The prestressed concrete pipe pile connection structure according to claim 8, characterized in that: The welding material is welded in the welding grooves of the upper end plate and the lower end plate by a three-layer full welding method, and the welding material includes a first material body, a second material body and a third material body connected in sequence from the inside to the outside, and the outer side of the third material body protrudes from the outer peripheral walls of the upper end plate and the lower end plate; a first connecting surface is formed between the first material body and the second material body, and a second connecting surface is formed between the second material body and the third material body, an acute angle is formed between the first connecting surface and the central axis of the upper end plate, an acute angle is formed between the second connecting surface and the central axis of the upper end plate, and an acute angle is formed between the first connecting surface and the second connecting surface.

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