Prestressed concrete precast pile with end plate and additional mechanical connection

Abstract

This utility model discloses a prestressed concrete precast pile with an end plate and additional mechanical connection, including prestressed steel bars, a concrete pile body, an end plate, and a mechanical connection assembly installed on the end plate. The mechanical connection assembly includes a plug rod, a bushing, interlocking flaps, and a compression spring. The end face of the concrete pile body has a blind hole corresponding to the mechanical connection assembly, and the opening of the blind hole communicates with the mounting hole. The bushing is threaded to the mounting hole. The internal space formed by the bushing and the blind hole is provided with multiple interlocking flaps. A compression spring is provided between the interlocking flaps and the inner end face of the blind hole. When connecting adjacent prestressed concrete precast piles with end plates and additional mechanical connection, the end plate of the plug rod is moved towards the end plate of the bushing, so that the plug section passes through the bushing and inserts into the interlocking flaps before the end plate is welded. Through the prestressed concrete precast pile with end plate and additional mechanical connection of this utility model, the strength of the pile head is guaranteed, while improving the corrosion resistance and connection strength of the connection between piles.

Description

Technical Field

[0001] This utility model relates to the field of precast pile technology, specifically to a prestressed concrete precast pile with end plates and additional mechanical connection. Background Technology

[0002] Precast concrete piles have advantages such as high structural strength and high construction efficiency, and are widely used in building foundation construction. In building pile foundation design, a relatively deep pile foundation is required to ensure the stability of the superstructure. The length of a single precast pile generally does not reach the designed depth, so multiple precast piles need to be connected end-to-end and driven downwards until the designed depth is reached.

[0003] Precast concrete piles can be divided into two types based on the pile head structure: precast piles with end plates and precast piles without end plates. Each of these two structures has its own advantages and disadvantages. The advantage of precast piles with end plates is that the pile head has high strength and is not easy to break during construction, and the end plates disperse the stress at the joint, avoiding stress concentration. In addition, adjacent pile heads are connected by welding the end plates, which is a simple process. However, the quality of the end plate welding is greatly affected by the skill of the workers, and the welding has high requirements for the construction environment. Construction cannot be carried out in strong winds, heavy rains, etc., and the weld is easily corroded. Therefore, the corrosion resistance of piles with welded end plates is not high and they cannot be used in corrosive environments. Utility Model Content

[0004] This invention addresses the shortcomings of the aforementioned precast piles with end plates by proposing a prestressed concrete precast pile with an additional mechanical connection. By setting a mechanical connection structure on the end plate, the strength of the precast pile head is ensured while the corrosion resistance of the pile foundation is improved. Even if the weld on the outer side of the end plate is corroded, the mechanical connection structure can still ensure that the two pile sections are firmly connected together, thereby improving the safety of the pile foundation.

[0005] This utility model is achieved through the following technical solution:

[0006] A prestressed concrete precast pile with additional mechanical connection and end plate includes prestressed steel bars, a concrete pile body, end plates and mechanical connection components installed on the end plates, wherein the prestressed steel bars are disposed in the concrete pile body and the end plates are disposed at both ends of the concrete pile body.

[0007] The end plate is provided with tensioning holes, which include mounting holes, extrusion holes and connecting holes. The inner wall of the mounting hole is threaded, the inner wall of the extrusion hole is frustum-shaped, and the inner diameter of the frustum is larger on the outside and smaller on the inside. The connecting hole connects the mounting hole and the extrusion hole. The end of the prestressed steel bar is upset and fixed in the extrusion hole.

[0008] The mechanical connection assembly includes a plug rod, a bushing, multiple engagement flaps, and a compression spring; the end face of the concrete pile is provided with a blind hole corresponding to the mechanical connection assembly.

[0009] The opening of the blind hole communicates with the mounting hole, the bushing is threaded to the mounting hole, the internal space formed by the bushing and the blind hole is provided with multiple engagement flaps, and the engagement flaps and the inner cavity end face of the blind hole are provided with compression springs.

[0010] The multiple occlusal flaps fit together to form a hollow columnar structure with an outer cylindrical surface. The outer cylindrical surface has a spiral groove, and a spiral spring is provided in the spiral groove.

[0011] The insertion rod includes an insertion section and a fixing section, and the insertion rod is threadedly connected to the mounting hole of the end plate of another prestressed concrete precast pile with an end plate, which has an additional mechanical connection, through the fixing section.

[0012] When connecting adjacent prestressed concrete precast piles with end plates for additional mechanical connection, the end plate on which the insert rod is installed is moved toward the end plate on which the bushing is installed, so that the insert section passes through the bushing and inserts into the interlocking flap, and then the end plate is welded.

[0013] As a further improvement of this utility model, the mechanical connection assembly further includes a sleeve with one end open and pre-embedded in the blind hole. The opening of the sleeve communicates with the mounting hole. The plurality of engagement flaps are disposed in the internal space formed by the bushing and the sleeve, and a compression spring is disposed between the engagement flaps and the inner end face of the sleeve.

[0014] As a further improvement of this utility model, the outer surface of the insertion section is provided with insertion teeth, and the inner surface of the hollow column formed by the multiple biting flaps is provided with biting grooves corresponding to the insertion teeth.

[0015] As a further improvement of this utility model, the concrete pile body is a solid pile body or a hollow pile body.

[0016] As a further improvement of this utility model, it also includes anchoring steel bars, one end of which is fixedly connected to the end plate, and the other end is inserted into the concrete pile body.

[0017] As a further improvement of this utility model, the end plate is also provided with a threaded through hole, the blind hole is positioned corresponding to the threaded through hole, and the installation and connection of the mechanical connection assembly are completed through the threaded through hole.

[0018] As a further improvement of this utility model, the end plate is provided with a thickened area, and the tensioning hole and the threaded through hole are disposed on the thickened area.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: the end plate protects the pile head of the concrete pile, the mechanical connection component attached to the end plate improves the connection strength between piles, and the mechanical connection structure, as another connection method besides end plate welding, improves the corrosion resistance of the precast pile. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is an overall structural diagram of the prestressed concrete precast pile with end plate and additional mechanical connection of this utility model;

[0022] Figure 2 This is a schematic diagram of the end plate connection of the prestressed concrete precast pile with end plate and additional mechanical connection according to this utility model.

[0023] Figure 3 This is a schematic diagram of the precast pile connection method of the first embodiment of the prestressed concrete precast pile with end plate additional mechanical connection of this utility model;

[0024] Figure 4 This is an exploded view of the mechanical connection assembly of the prestressed concrete precast pile with end plate and additional mechanical connection according to this utility model.

[0025] Figure 5 This is a structural diagram of the end plate of the first embodiment of the prestressed concrete precast pile with end plate and additional mechanical connection of this utility model;

[0026] Figure 6 This is a schematic diagram of the tensioning hole of the prestressed concrete precast pile with end plate and additional mechanical connection according to this utility model.

[0027] Figure 7 This is a schematic diagram of the connection method of the mechanical connection assembly of the prestressed concrete precast pile with end plate additional mechanical connection of this utility model.

[0028] Figure 8 This is an assembly diagram of multiple interlocking segments of a prestressed concrete precast pile with end plates and additional mechanical connection according to this utility model.

[0029] Figure 9 This is a schematic diagram of the interlocking flap structure of the prestressed concrete precast pile with end plate and additional mechanical connection of this utility model.

[0030] Figure 10This is a schematic diagram of the insertion rod structure of the prestressed concrete precast pile with end plate and additional mechanical connection according to this utility model.

[0031] Figure 11 This is a schematic diagram of the compression spring structure of the prestressed concrete precast pile with end plate and additional mechanical connection of this utility model.

[0032] Figure 12 This is a schematic diagram of the tension nut installation of the first embodiment of the prestressed concrete precast pile with end plate and additional mechanical connection of this utility model;

[0033] Figure 13 This is a schematic diagram of the concrete pile manufacturing process of the first embodiment of the prestressed concrete precast pile with end plate and additional mechanical connection of this utility model.

[0034] Figure 14 This is a schematic diagram of the end plate structure of the second embodiment of the prestressed concrete precast pile with end plate and additional mechanical connection of this utility model;

[0035] Figure 15 This is a schematic diagram of the tension nut installation of the second embodiment of the prestressed concrete precast pile with end plate and additional mechanical connection of this utility model;

[0036] Figure 16 This is a schematic diagram of the tension nut structure and installation of the third embodiment of the prestressed concrete precast pile with end plate and additional mechanical connection of this utility model;

[0037] Figure 17 This is a schematic diagram of the connection method of the mechanical connection component of the third embodiment of the prestressed concrete precast pile with end plate and additional mechanical connection of the utility model. Detailed Implementation

[0038] The technical solutions of various embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0039] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0040] First Embodiment

[0041] A prestressed concrete precast pile with additional mechanical connection and end plate includes prestressed steel bars 1, concrete pile body 2, end plate 3, and mechanical connection assembly installed on end plate 3. The prestressed steel bars 1 are disposed inside the concrete pile body 2, and the end plate 3 is disposed at both ends of the concrete pile body 2.

[0042] The end plate 3 is provided with tensioning holes 4 evenly distributed in the circumference. The tensioning holes 4 include mounting holes 5, extrusion holes 6 and connecting holes 7. The inner wall of the mounting hole 5 is provided with threads. The inner wall of the extrusion hole 6 is in the shape of a frustum. The inner diameter of the frustum is larger on the outside and smaller on the inside. The connecting hole 7 connects the mounting hole 5 and the extrusion hole 6. The end of the prestressed steel bar 1 is in the shape of an upsetting head and is fixed in the extrusion hole 6.

[0043] The mechanical connection assembly includes a plug rod 8, a bushing 9, four interlocking flaps 10, a sleeve 11, and a compression spring 12. The end face of the concrete pile body has a blind hole 26 corresponding to the mechanical connection assembly. The sleeve 11 is open at one end and pre-embedded in the blind hole 26. The opening of the sleeve 11 communicates with the mounting hole 5. The bushing 9 is threadedly connected to the mounting hole 5. The internal space formed by the bushing 9 and the sleeve 11 is provided with four interlocking flaps 10. A compression spring 12 is provided between the interlocking flaps 10 and the inner end face of the sleeve 11. The two ends of the compression spring 12 are machined into rings to make the force on the ends of the compression spring 12 more even, preventing slippage and bending during compression. The structure of the compression spring 12 is shown in the figure.

[0044] Four interlocking flaps 10 fit together to form a hollow cylindrical structure with an outer cylindrical surface 13. The outer cylindrical surface 13 has a spiral groove 14, and a spiral spring 15 is installed in the spiral groove 14. The spiral spring 15 is used to fit and connect the four interlocking flaps 10. On the one hand, it prevents the four interlocking flaps 10 from being scattered independently. On the other hand, it restricts the movement of the four interlocking flaps 10 along the central axis to prevent misalignment between the interlocking flaps 10. The spiral groove 14 is used to prevent the spiral spring 15 from slipping away from the four interlocking flaps 10, ensuring the connection stability between the two and effectively improving the clamping effect on the four interlocking flaps 10.

[0045] In this embodiment, the pitch of the helical groove 14 is designed to be equal to the pitch of the helical spring 15 in its natural state, which can prevent the helical spring 15 from being in an axially compressed state for a long time, thus affecting its lifespan. The depth of the helical groove 14 is greater than or equal to the cross-sectional diameter of the helical spring 15, and the outer surface of the engagement flap 10 corresponding to the end of the helical groove 14 is spot-welded to the end of the helical spring 15. After one end of the helical spring 15 is welded and fixed to the engagement flap 10, when the engagement flap 10 separates, because one end of the helical spring 15 is fixed, the helical spring 15 deforms but will not detach from the helical groove 14, nor will it move relative to the engagement flap 10.

[0046] The insertion rod 8 includes an insertion section 16 and a fixing section 17. The insertion rod 8 is connected to the mounting hole 5 corresponding to the mounting position of the sleeve 11 of the end plate 3 of another prestressed concrete precast pile with an additional mechanical connection through the fixing section 17.

[0047] When connecting adjacent prestressed concrete precast piles with end plates using additional mechanical connections, the end plate 3 of the mounting rod 8 is moved towards the end plate 3 of the mounting bushing 9, so that the insertion section 16 passes through the bushing 9, the rod 8 passes through the bushing 9 and pushes the four interlocking petals 10. The interlocking petals 10 move as the rod 8 is inserted and squeeze the compression spring 12. At the same time, the four interlocking petals 10 separate, which makes the enclosed hollow cylindrical space larger, making it easier for the rod 8 to be inserted. After the rod 8 is fully inserted, under the combined action of the compression spring 12 and the helical spring 15, the four interlocking petals 10 move back towards the bushing 9 and tightly wrap the rod 8. After the rod 8 is inserted, the two end plates 3 are attached together, and then the end plates 3 are welded and fixed.

[0048] The outer surface of the insertion section 16 is provided with insertion teeth 18, and the inner surface of the hollow column formed by multiple engagement petals 10 is provided with engagement grooves 19 corresponding to the insertion teeth 18. After the insertion rod 8 is inserted into the engagement petals 10, the insertion teeth 18 are embedded in the engagement grooves 19, which improves the connection strength. In addition, an embedding chamfer 26 is provided at the root of the insertion section 16, and an embedding ring edge 27 corresponding to the embedding chamfer is provided at the opening of the bushing 9, so that after the insertion section is inserted, the embedding chamfer 26 is embedded in the embedding ring edge 27, which improves the overall bending resistance of the insertion rod.

[0049] In this embodiment, the concrete pile 2 is a hollow pile with a circular cross-section, the two end plates 3 are annular, the number of tensioning holes 4 is consistent with the prestressed steel bars 1 and is arranged circumferentially according to the setting form of the prestressed steel bars 1.

[0050] In other embodiments, the cross-section of the concrete pile 2 may also be square or other shapes.

[0051] In other embodiments, the concrete pile 2 can also be configured as a solid pile.

[0052] In other embodiments, the concrete pile 2 may also be configured as a variable cross-section pile along the pile extension direction.

[0053] In this embodiment, an anchoring steel bar 20 is also pre-embedded in the concrete pile body 2. One end of the anchoring steel bar 20 is welded to the end plate 3, and the other end is inserted into the concrete pile body 2.

[0054] The end plate 3 has a thickened area, and the tensioning hole 4 is located on the thickened area. In order to prevent the end plate 3 from deforming or being damaged during the tensioning process, the end plate 3 is thickened in a local area of ​​the tensioning hole 4.

[0055] The construction method of the prestressed concrete precast pile with end plate and additional mechanical connection in this embodiment includes the following steps:

[0056] S1: Upset both ends of the prestressed steel bar 1, install end plates 3 at both ends of the prestressed steel bar 1, insert the prestressed steel bar 1 and its upset head through the mounting hole 5 and move it to the extrusion hole 6 through the connecting hole 7, and use the edge structure of the extrusion hole 6 to hold the upset head of the prestressed steel bar 1.

[0057] S2: Place the prestressed steel bar 1 and end plate 3 into the bottom template 24, screw the tension nut 21 through the tension plate 23 into the mounting hole 5, and let the end of the tension nut 21 pass through the end plate 3. Set the internal thread corresponding to the tension nut on the inner wall of the open end of the sleeve 11, and install the sleeve 11 on the end of the tension nut 21 on at least one end plate so that the end face of the sleeve 11 is in close contact with the end plate 3 to prevent concrete liquid from flowing into the sleeve 11 during pouring. Weld the anchor steel bar 20 on the inner side of the end plate 3.

[0058] S3: Pour unformed concrete into the bottom formwork 24, cover with the top formwork, and connect the bottom formwork 24 and the top formwork with bolts. Connect the tensioning device 22 for tensioning. After tensioning, use the bottom formwork 24 and the top formwork to lock the tension force, and remove the tensioning device 22. Hoist the formwork and the pile inside the formwork onto a centrifuge for centrifugal molding of the concrete, and then cure it. After the concrete strength reaches the standard, the concrete pile 2 is formed. Perform prestressing release and remove the top formwork and bottom formwork 24. Then remove the tensioning nut 21 and tensioning plate 23. After the pile has been cured for a period of time, it is transported to the construction site.

[0059] S4: Keep the sleeve 11 facing upwards on the first prestressed concrete precast pile with additional mechanical connection and end plate, and construct it from the preset position of the pile to the connection position.

[0060] S5: After installing the compression spring 12 and multiple engagement flaps 10 in sequence inside the sleeve 11, install the bushing 9 in the mounting hole 5 of the end plate 3.

[0061] S6: Install the insert rod 8 in the mounting hole 5 of the end plate 3 of the second additional mechanically connected prestressed concrete precast pile with end plate. If the sleeve 11 is pre-embedded at only one end of the second additional mechanically connected prestressed concrete precast pile with end plate 3, then the insert rod 8 should be installed at a different end from the sleeve 11.

[0062] S7: The second prestressed concrete precast pile with end plate 3 and additional mechanical connection is hoisted with the insertion rod 8 facing downwards above the first prestressed concrete precast pile with end plate 3 and additional mechanical connection.

[0063] S8: Lower the second prestressed concrete precast pile with end plate 3 for additional mechanical connection so that the insertion rod 8 is inserted into the sleeve 11 of the first prestressed concrete precast pile with end plate 3 for additional mechanical connection, and the mechanical connection is completed.

[0064] S9: Weld and fix the two end plates 3 at the connection point.

[0065] S10: Continue construction of the second prestressed concrete pile with end plate and additional mechanical connection, and repeat steps S4 to S9 until the pile foundation construction is completed.

[0066] Second embodiment:

[0067] The difference between this embodiment and the first embodiment is that the end plate 3 is also provided with a threaded through hole 25. The opening of the sleeve 11 communicates with the threaded through hole 25, and the installation of the mechanical connection assembly is completed through the threaded through hole 25. Since the connecting hole 7 disrupts the integrity of the mounting hole 5, the thread of the mounting hole 5 is incomplete, which may lead to uneven force during tensioning and make the end plate 3 easily damaged. Therefore, the end plate 3 is additionally provided with a threaded through hole 25 with complete threads, which is used for tensioning and also for the installation of the mechanical connection assembly.

[0068] In this embodiment, threaded through holes 25 are set on the thickened area and evenly distributed circumferentially. To ensure uniform stress on the prestressed steel bar 1, the pitch circle of the threaded through hole 25 is equal to the pitch circle of the tensioning hole 4. When installing the mechanical connection assembly, the threaded through hole 25 is used instead of the mounting hole 5 for installation. Therefore, the construction method of the prestressed concrete precast pile with end plate and additional mechanical connection in this embodiment specifically includes the following steps:

[0069] S1: Upset both ends of the prestressed steel bar 1, install end plates 3 at both ends of the prestressed steel bar 1, insert the prestressed steel bar 1 and its upset head through the mounting hole 5 and move it to the extrusion hole 6 through the connecting hole 7, and use the edge structure of the extrusion hole 6 to hold the upset head of the prestressed steel bar 1.

[0070] S2: Place the prestressed steel bar 1 and end plate 3 into the bottom template 24, screw the tension nut 21 through the tension plate 23 into the threaded through hole 25, and the end of the tension nut 21 passes through the end plate 3. Set the internal thread corresponding to the tension nut on the inner wall of the open end of the sleeve 11, and install the sleeve 11 on the end of the tension nut 21 on at least one end plate so that the end face of the sleeve is in close contact with the end plate 3 to prevent concrete liquid from flowing into the sleeve 11 during pouring. Weld the anchor steel bar 20 on the inner side of the end plate 3.

[0071] S3: Pour unformed concrete into the bottom formwork 24, cover with the top formwork, and connect the bottom formwork 24 and the top formwork with bolts. Connect the tensioning device 22 for tensioning. After tensioning, use the bottom formwork 24 and the top formwork to lock the tension force, and remove the tensioning device 22. Hoist the formwork and the pile inside the formwork onto a centrifuge for centrifugal molding of the concrete, and then cure it. After the concrete strength reaches the standard, the concrete pile 2 is formed. Perform prestressing release and remove the top formwork and bottom formwork 24. Then remove the tensioning nut 21 and tensioning plate 23. After the pile has been cured for a period of time, it is transported to the construction site.

[0072] S4: Keep the sleeve 11 facing upwards on the first prestressed concrete precast pile with additional mechanical connection and end plate, and construct it from the preset position of the pile to the connection position.

[0073] S5: After installing the compression spring 12 and multiple engagement flaps 10 in sequence inside the sleeve 11, install the bushing 9 in the threaded through hole 25 of the end plate 3.

[0074] S6: Install the insert rod 8 in the threaded through hole 25 of the end plate 3 of the second additional mechanical connection prestressed concrete precast pile with end plate. If the sleeve 11 is pre-embedded at only one end of the second additional mechanical connection prestressed concrete precast pile with end plate 3, then the insert rod 8 should be installed at a different end from the sleeve 11.

[0075] S7: Keep the second prestressed concrete precast pile with end plate and additional mechanical connection, with the insertion rod 8 facing downwards, and hoist it above the first prestressed concrete precast pile with end plate 3 and additional mechanical connection.

[0076] S8: Lower the second additional mechanically connected prestressed concrete precast pile rod 8 with end plate into the sleeve 11 of the first additional mechanically connected prestressed concrete precast pile with end plate to complete the mechanical connection.

[0077] S9: Weld and fix the two end plates 3 at the connection point.

[0078] S10: Continue construction of the second prestressed concrete precast pile with end plate 3 and additional mechanical connection, and repeat steps S4 to S9 until the pile foundation construction is completed.

[0079] Third Embodiment

[0080] The difference between this embodiment and the first embodiment is that the mechanical connection assembly does not include a sleeve 11. Instead, a blind hole 26 is formed on the end face of the concrete pile 2 during manufacturing. Multiple interlocking flaps 10 are disposed in the internal space formed by the bushing 9 and the blind hole 26, and a compression spring 12 is disposed between the interlocking flaps 10 and the inner end face of the blind hole 26. This solution omits the sleeve 11 structure, reducing manufacturing costs. Therefore, the construction method of the prestressed concrete precast pile with end plate and additional mechanical connection in this embodiment specifically includes the following steps:

[0081] S1: Upset both ends of the prestressed steel bar 1, install end plates 3 at both ends of the prestressed steel bar 1, insert the prestressed steel bar 1 and its upset head through the mounting hole 5 and move it to the extrusion hole 6 through the connecting hole 7, and use the edge structure of the extrusion hole 6 to hold the upset head of the prestressed steel bar 1.

[0082] S2: Place the prestressed steel bar 1 and end plate 3 into the bottom template 24, and screw the tension nut 21 through the tension plate into the installation hole 5. The threaded part of the tension nut 21 includes a straight section 27 and a threaded section 28. After the tension nut is installed, the straight section 27 passes through the end plate, and the threaded section 28 engages with the thread of the installation hole 5. Before installation, apply release oil to the straight section of the tension nut 21 to facilitate subsequent removal.

[0083] S3: Pour unformed concrete into the bottom formwork 24, cover with the top formwork, and connect the bottom formwork 24 and the top formwork with bolts. Connect the tensioning device 22 for tensioning. After tensioning, use the bottom formwork 24 and the top formwork to lock the tension force, and remove the tensioning device 22. Hoist the formwork and the pile inside the formwork onto a centrifuge for centrifugal molding of the concrete, and then cure it. After the concrete strength reaches the standard, a concrete pile is formed. Perform prestress release, remove the top formwork and bottom formwork, and remove the tensioning nuts and tensioning plates. After the tensioning nuts 21 are removed, blind holes 26 are formed at the ends of the concrete pile 2. After the pile has been cured for a period of time, it is transported to the construction site.

[0084] S4: Construct the first prestressed concrete precast pile with end plate and additional mechanical connection from the preset position of the pile to the connection position;

[0085] S5: After installing the compression spring 12 and multiple engagement flaps 10 in sequence in the blind hole 26, install the bushing 9 in the mounting hole of the end plate.

[0086] S6: Install the insertion rod 8 in the mounting hole of the end plate of the second prestressed concrete precast pile with end plate for additional mechanical connection.

[0087] S7: Hoist the second prestressed concrete pile with end plate and additional mechanical connection, keeping the insertion rod facing downwards, above the first prestressed concrete pile with end plate and additional mechanical connection.

[0088] S8: Lower the second additional mechanical connection rod of the prestressed concrete precast pile with end plate into the blind hole 26 of the first additional mechanical connection to complete the mechanical connection;

[0089] S9: Weld and fix the two end plates at the connection point.

[0090] S10: Continue construction of the second prestressed concrete pile with end plate and additional mechanical connection, and repeat steps S4 to S9 until the pile foundation construction is completed.

[0091] Fourth embodiment

[0092] The fourth embodiment differs from the third embodiment in that the end plate 3 is further provided with a threaded through hole 25. The installation of the mechanical connection assembly is completed through the threaded through hole 25. Therefore, the construction method of the prestressed concrete precast pile with end plate and additional mechanical connection in this embodiment differs from the construction method of the third embodiment in the following aspects:

[0093] S2: Place the prestressed steel bar 1 and end plate 3 into the bottom template 24. After passing the tension nut 21 through the tension plate, screw it into the threaded through hole 25. The threaded part of the tension nut 21 includes a straight section 27 and a threaded section 28. After the tension nut is installed, the straight section 27 passes through the end plate, and the threaded section 28 engages with the thread of the threaded through hole 25. Before installation, apply release oil to the straight section 27 of the tension nut 21 to facilitate subsequent removal.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this utility model.

Claims

1. A prestressed concrete precast pile with an additional mechanical connection and an end plate, comprising prestressed steel bars, a concrete pile body, an end plate, and a mechanical connection assembly mounted on the end plate, characterized in that: The prestressed steel bars are installed inside the concrete pile, and the end plates are installed at both ends of the concrete pile. The end plate is provided with tensioning holes, which include mounting holes, extrusion holes and connecting holes. The inner wall of the mounting hole is threaded, the inner wall of the extrusion hole is frustum-shaped, and the inner diameter of the frustum is larger on the outside and smaller on the inside. The connecting hole connects the mounting hole and the extrusion hole. The end of the prestressed steel bar is upset and fixed in the extrusion hole. The mechanical connection assembly includes a plug rod, a bushing, multiple engagement flaps, and a compression spring; the end face of the concrete pile has a blind hole corresponding to the mechanical connection assembly. The opening of the blind hole communicates with the mounting hole, the bushing is threaded to the mounting hole, the internal space formed by the bushing and the blind hole is provided with multiple engagement flaps, and the engagement flaps and the inner cavity end face of the blind hole are provided with compression springs. The multiple occlusal flaps fit together to form a hollow columnar structure with an outer cylindrical surface. The outer cylindrical surface has a spiral groove, and a spiral spring is provided in the spiral groove. The insertion rod includes an insertion section and a fixing section, and the insertion rod is threadedly connected to the mounting hole of the end plate of another prestressed concrete precast pile with an end plate, which has an additional mechanical connection, through the fixing section. When connecting adjacent prestressed concrete precast piles with end plates for additional mechanical connection, the end plate on which the insert rod is installed is moved toward the end plate on which the bushing is installed, so that the insert section passes through the bushing and inserts into the interlocking flap, and then the end plate is welded.

2. The prestressed concrete precast pile with end plate and additional mechanical connection according to claim 1, characterized in that: The mechanical connection assembly also includes a sleeve with one end open and pre-embedded in the blind hole. The opening of the sleeve communicates with the mounting hole. The plurality of engagement flaps are disposed in the internal space formed by the bushing and the sleeve. A compression spring is disposed between the engagement flaps and the inner end face of the sleeve.

3. The prestressed concrete precast pile with end plate and additional mechanical connection according to claim 1, characterized in that: The outer surface of the insertion section is provided with insertion teeth, and the inner surface of the hollow column formed by the multiple occlusal flaps is provided with occlusal grooves corresponding to the insertion teeth.

4. The prestressed concrete precast pile with end plate and additional mechanical connection according to claim 1, characterized in that: The concrete pile can be a solid pile or a hollow pile.

5. The prestressed concrete precast pile with end plate and additional mechanical connection according to claim 1, characterized in that: It also includes anchoring steel bars, one end of which is fixedly connected to the end plate, and the other end is inserted into the concrete pile body.

6. The prestressed concrete precast pile with end plate and additional mechanical connection according to any one of claims 1-5, characterized in that: The end plate is also provided with a threaded through hole, and the blind hole is positioned corresponding to the threaded through hole. The installation and connection of the mechanical connection assembly are completed through the threaded through hole.

7. The prestressed concrete precast pile with end plate and additional mechanical connection according to claim 6, characterized in that: The end plate is provided with a thickened area, and the tensioning hole and the threaded through hole are provided on the thickened area.

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