Hybrid reinforcement precast pile and manufacturing method thereof, and splicing structure and construction method thereof

Abstract

This invention discloses a precast pile with hybrid reinforcement, its manufacturing method, and its splicing structure and construction method. The precast pile with hybrid reinforcement includes a pile body made of concrete, in which multiple prestressed and non-prestressed steel bars are embedded. At least one end of the pile body has a first sleeve adapted to the prestressed steel bars and a second sleeve adapted to the non-prestressed steel bars embedded in its end face. Both the first and second sleeves have internal threads on their inner walls. The prestressed steel bars are connected to the first sleeve, and the ends of the non-prestressed steel bars are inserted into the second sleeve, which is filled with a cementitious material. This invention does not use end plates to tension the prestressed steel bars and achieves a fixed connection between the non-prestressed steel bars and the sleeves while ensuring that the non-prestressed steel bars are not tensioned.

Description

Technical Field

[0001] This invention relates to the field of precast pile technology, and in particular to a precast pile with mixed reinforcement, its manufacturing method, its splicing structure, and its construction method. Background Technology

[0002] With the rapid development of urban construction in my country, prestressed concrete piles with hybrid reinforcement have been widely used in key areas of basic construction such as industrial and civil buildings, municipal bridges, and highways due to their high flexural strength, factory production, energy conservation and environmental protection, and wide application range. The characteristics of prestressed concrete piles with hybrid reinforcement are: ordinary threaded steel bars are added as non-prestressed reinforcement on the basis of prestressed steel bars. These non-prestressed steel bars must not be tensioned during the precast pile production process and do not provide prestress, thus improving the ductility and toughness of the prestressed pile. This ensures that even if cracks appear in the pile body when subjected to strong bending moments, brittle failure will not occur.

[0003] In order to reduce the use of end plates, existing prestressed concrete piles use sleeves at the ends of the piles to tension the prestressed steel bars, as disclosed in Chinese utility model patent CN212670583U. However, when applying this sleeve structure to precast piles with mixed reinforcement, ensuring that the non-prestressed steel bars are not tensioned and that they are securely connected to the sleeve becomes a pressing technical problem that needs to be solved in the existing technology. Summary of the Invention

[0004] This invention provides a precast pile with mixed reinforcement, its manufacturing method, and a pile splicing structure and construction method. It does not use end plates to tension the prestressed steel bars, and achieves the fixed connection between the non-prestressed steel bars and the sleeve while ensuring that the non-prestressed steel bars are not tensioned.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] According to a first aspect of the present invention, an embodiment of the present invention provides a precast pile with mixed reinforcement, comprising a pile body made of concrete, wherein a plurality of prestressed steel bars and non-prestressed steel bars are embedded in the pile body; at least one end face of the pile body is fitted with a first sleeve adapted to the prestressed steel bars and a second sleeve adapted to the non-prestressed steel bars, wherein the inner walls of the first sleeve and the second sleeve are provided with internal threads; the prestressed steel bars are connected to the first sleeve, the ends of the non-prestressed steel bars are inserted into the second sleeve, and the second sleeve is filled with a cementitious material.

[0007] In some embodiments, the inner wall of the second sleeve is provided with a plurality of protrusions.

[0008] According to a second aspect of the present invention, an embodiment of the present invention provides a method for manufacturing a precast pile with mixed reinforcement as described in the first aspect above, comprising the following steps:

[0009] (1) Pass the prestressed steel bars through the first sleeve and connect the prestressed steel bars to the first sleeve, and wrap stirrups around the prestressed steel bars and non-prestressed steel bars to make a steel cage;

[0010] (2) Insert the end of the non-prestressed steel bar into the second sleeve, and then fix the first sleeve and the second sleeve to the back of the tensioning plate with fixing screws;

[0011] (3) Place the assembled steel cage and tensioning plate into the mold, and connect the tensioning plate to the tensioning equipment;

[0012] (4) The tensioning plate is moved forward a preset distance by the tensioning equipment to tension the prestressed steel bars;

[0013] (5) Inject concrete into the mold, and use vibration compaction or centrifugal molding process to make some of the concrete flow into the second sleeve, and make the concrete form and compact in the mold.

[0014] (6) After the concrete has solidified, open the mold, remove the fixing screws on the tension plate, separate the first sleeve and the second sleeve from the tension plate, and then take out the formed precast pile.

[0015] According to a third aspect of the present invention, an embodiment of the present invention provides a method for manufacturing a precast pile with mixed reinforcement as described in the first aspect above, comprising the following steps:

[0016] (1) Fix the second sleeve to the back of the tensioning plate with fixing screws;

[0017] (2) Pass the prestressed steel bars through the first sleeve and connect the prestressed steel bars to the first sleeve, and wrap stirrups around the prestressed steel bars and non-prestressed steel bars to make a steel cage;

[0018] (3) Insert the end of the non-prestressed steel bar into the second sleeve, fill the second sleeve with cementitious material, and then fix the first sleeve to the back of the tensioning plate with fixing screws.

[0019] (4) Place the assembled steel cage and tensioning plate into the mold, and connect the tensioning plate to the tensioning equipment;

[0020] (5) The tensioning plate is moved forward a preset distance by the tensioning equipment to tension the prestressed steel bars;

[0021] (6) Inject concrete into the mold and use vibration compaction or centrifugal molding process to make the concrete form and compact in the mold;

[0022] (7) After the concrete has solidified, open the mold, remove the fixing screws on the tension plate, so that the first sleeve and the second sleeve are separated from the tension plate, and then take out the formed precast pile.

[0023] According to a fourth aspect of the present invention, embodiments of the present invention provide a precast pile with mixed reinforcement, comprising a pile body made of concrete, wherein a plurality of prestressed and non-prestressed steel bars are embedded in the pile body; at least one end face of the pile body is fitted with a first sleeve adapted to the prestressed steel bars and a second sleeve adapted to the non-prestressed steel bars, both the first and second sleeves having internal threads on their inner walls; the prestressed steel bars are connected to the first sleeve, and the end of the non-prestressed steel bars near the second sleeve forms an upsetting head, the upsetting head being inserted into the second sleeve; a retaining ring is provided on the inner wall of the end of the second sleeve near the non-prestressed steel bars, the inner diameter of the retaining ring being larger than the diameter of the non-prestressed steel bars and smaller than the diameter of the upsetting head; the portion of the second sleeve located between the upsetting head and the retaining ring is filled with a cementitious material.

[0024] In some embodiments, the sidewall of the second sleeve near the non-prestressed steel bar is provided with a through flow hole for supplying cementitious material.

[0025] According to a fifth aspect of the present invention, an embodiment of the present invention provides a method for manufacturing a precast pile with mixed reinforcement as described in the fourth aspect above, comprising the following steps:

[0026] (1) Pass the prestressed steel bar through the first sleeve and connect the prestressed steel bar to the first sleeve, and pass one end of the non-prestressed steel bar through the retaining ring and insert it into the second sleeve;

[0027] (2) The ends of the non-prestressed steel bars are upset, the diameter of the upset head is greater than the inner diameter of the retaining ring, and the diameter of the upset head is less than the inner diameter of the second sleeve.

[0028] (3) Wrap stirrups around prestressed steel bars and non-prestressed steel bars to make a steel cage;

[0029] (4) Fix both the first sleeve and the second sleeve to the back of the tensioning plate using fixing screws;

[0030] (5) Place the assembled steel cage and tensioning plate into the mold and connect the tensioning plate to the tensioning equipment;

[0031] (6) The tensioning plate is moved forward a preset distance by the tensioning equipment to tension the prestressed steel bars;

[0032] (7) Inject concrete into the mold, and use vibration compaction or centrifugal molding process to make some of the concrete flow into the second sleeve, and make the concrete form and compact in the mold.

[0033] (8) After the concrete has solidified, open the mold, remove the fixing screws on the tension plate, separate the first sleeve and the second sleeve from the tension plate, and then take out the formed precast pile.

[0034] According to a sixth aspect of the present invention, an embodiment of the present invention provides a method for manufacturing a precast pile with mixed reinforcement as described in the fourth aspect above, comprising the following steps:

[0035] (1) Pass the prestressed steel bar through the first sleeve and connect the prestressed steel bar to the first sleeve, and pass one end of the non-prestressed steel bar through the retaining ring and insert it into the second sleeve;

[0036] (2) The ends of the non-prestressed steel bars are upset, the diameter of the upset head is greater than the inner diameter of the retaining ring, and the diameter of the upset head is less than the inner diameter of the second sleeve.

[0037] (3) Wrap stirrups around prestressed steel bars and non-prestressed steel bars to make a steel cage;

[0038] (4) Fix both the first sleeve and the second sleeve to the back of the tensioning plate using fixing screws;

[0039] (5) Place the assembled steel cage and tensioning plate into the mold and connect the tensioning plate to the tensioning equipment;

[0040] (6) Fill the second sleeve between the upsetting head and the retaining ring with cementitious material;

[0041] (7) The tensioning plate is moved forward a preset distance by the tensioning equipment to tension the prestressed steel bars;

[0042] (8) Inject concrete into the mold and use vibration compaction or centrifugal molding process to make the concrete form and compact in the mold;

[0043] (9) After the concrete has solidified, open the mold, remove the fixing screws on the tension plate, separate the first sleeve and the second sleeve from the tension plate, and then take out the formed precast pile.

[0044] According to a seventh aspect of the present invention, an embodiment of the present invention provides a pile splicing structure comprising a plurality of precast piles with mixed reinforcement as described in the first or fourth aspect above, wherein the precast piles with mixed reinforcement are arranged sequentially along the length direction of the pile body, and a plurality of first connectors and second connectors are provided between adjacent pile bodies, wherein the two ends of the first connectors are respectively connected to the first sleeves of the two adjacent pile bodies, and the two ends of the second connectors are respectively connected to the second sleeves of the two adjacent pile bodies.

[0045] In some embodiments, the lower ends of the first connector and the second connector are respectively inserted into the first sleeve and the second sleeve at the top of the lower pile of two adjacent precast piles with mixed reinforcement, and the space between the first connector and the first sleeve at the top of the lower pile, as well as the space between the second connector and the second sleeve at the top of the lower pile, is filled with cementitious material; the upper ends of the first connector and the second connector are both provided with external threads, and the upper ends of the first connector and the second connector are respectively threaded to the first sleeve and the second sleeve at the bottom of the upper pile of two adjacent precast piles with mixed reinforcement.

[0046] In some embodiments, the lower ends of the first connector and the second connector are respectively inserted into the first sleeve and the second sleeve at the top of the lower pile of two adjacent precast piles with mixed reinforcement, and the space between the first connector and the first sleeve at the top of the lower pile, as well as the space between the second connector and the second sleeve at the top of the lower pile, is filled with cementitious material; the upper ends of the first connector and the second connector are respectively inserted into the first sleeve and the second sleeve at the bottom of the upper pile of two adjacent precast piles with mixed reinforcement, and the space between the first connector and the first sleeve at the bottom of the upper pile, as well as the space between the second connector and the second sleeve at the bottom of the upper pile, is filled with cementitious material.

[0047] In some embodiments, the first connector and the second connector are respectively a first connecting bolt and a second connecting bolt. The upper ends of the first connecting bolt and the second connecting bolt are respectively threaded to the first sleeve and the second sleeve at the bottom of the upper section of two adjacent precast piles with mixed reinforcement. The lower ends of the first connecting bolt and the second connecting bolt are respectively threaded to the first sleeve and the second sleeve at the top of the lower section of two adjacent precast piles with mixed reinforcement.

[0048] According to an eighth aspect of the present invention, an embodiment of the present invention provides a construction method for a pile splicing structure, comprising the following steps:

[0049] (1) Drive the lower section of the pile into the ground a predetermined distance;

[0050] (2) Screw the upper ends of the first connector and the second connector into the first sleeve and the second sleeve at the bottom of the upper section of the pile, respectively;

[0051] (3) Inject cementitious material into both the first and second sleeves at the top of the lower pile section;

[0052] (4) Lift the upper section of the pile, adjust the position of the upper section of the pile so that the upper section of the pile is accurately aligned with the lower section of the pile, and insert the lower ends of the first connector and the second connector into the first sleeve and the second sleeve at the top of the lower section of the pile, so that the lower ends of the first connector and the second connector are fully wrapped by the cementitious material.

[0053] (5) Wait for the cementitious material in the first and second sleeves at the top of the next pile section to solidify and harden.

[0054] According to a ninth aspect of the present invention, an embodiment of the present invention provides a construction method for a pile splicing structure, comprising the following steps:

[0055] (1) Drive the lower section of the pile into the ground a predetermined distance;

[0056] (2) Inject cementitious material into the first sleeve and the second sleeve at the bottom of the upper section of the pile, and insert the upper ends of the first connector and the second connector into the first sleeve and the second sleeve at the bottom of the upper section of the pile respectively, and wait for the cementitious material in the first sleeve and the second sleeve at the bottom of the upper section of the pile to solidify and harden.

[0057] (3) Inject cementitious material into both the first and second sleeves at the top of the lower pile section;

[0058] (4) Lift the upper section of the pile, adjust the position of the upper section of the pile so that the upper section of the pile is accurately aligned with the lower section of the pile, and insert the lower ends of the first connector and the second connector into the first sleeve and the second sleeve at the top of the lower section of the pile, so that the lower ends of the first connector and the second connector are fully wrapped by the cementitious material.

[0059] (5) Wait for the cementitious material in the first and second sleeves at the top of the next pile section to solidify and harden.

[0060] According to a tenth aspect of the present invention, an embodiment of the present invention provides a construction method for a pile splicing structure, comprising the following steps:

[0061] (1) Drive the lower section of the pile into the ground a predetermined distance;

[0062] (2) Lift the upper section of the pile and adjust its position so that the upper section of the pile is accurately aligned with the lower section of the pile. Place multiple temporary blocks on the top end face of the lower section of the pile. The lengths of the first and second connecting bolts are the same as the height of the temporary blocks.

[0063] (3) Lower the upper section of the pile vertically onto the temporary pad, place multiple first connecting bolts and second connecting bolts between the upper and lower sections of the pile, screw the two ends of the first connecting bolts into the first sleeves of the upper and lower sections of the pile respectively, and screw the two ends of the second connecting bolts into the second sleeves of the upper and lower sections of the pile respectively.

[0064] (4) Remove the temporary pad and rotate the first connecting bolt and the second connecting bolt so that the two ends of the first connecting bolt are simultaneously rotated and anchored into the first sleeve of the upper and lower pile sections, and the two ends of the second connecting bolt are simultaneously rotated and anchored into the second sleeve of the upper and lower pile sections.

[0065] The present invention has at least the following beneficial effects: A first sleeve is connected to the end of the prestressed steel bar, and a second sleeve is provided at the end of the non-prestressed steel bar. When tensioning the prestressed steel bar, the first and second sleeves are directly fixed to the tensioning plate, thus eliminating the need for end plates and reducing the amount of steel used. Simultaneously, before the cementitious material solidifies, the non-prestressed steel bar can move axially along the second sleeve. Therefore, when tensioning the prestressed steel bar, the non-prestressed steel bar is not subjected to tensile force, improving the pile's toughness and ductility. After the cementitious material solidifies, it can seamlessly and rigidly fasten the second sleeve and the non-prestressed steel bar together, effectively improving the stability of the connection between the non-prestressed steel bar and the second sleeve. Attached Figure Description

[0066] Figure 1 This is a schematic diagram of a precast pile with mixed reinforcement according to an embodiment of the present invention;

[0067] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0068] Figure 3 This is a schematic diagram of a precast pile with mixed reinforcement according to an embodiment of the present invention during tensioning;

[0069] Figure 4 This is a schematic diagram of a precast pile with mixed reinforcement according to another embodiment of the present invention;

[0070] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0071] Figure 6 This is a schematic diagram of the structure of a precast pile with mixed reinforcement according to another embodiment of the present invention during tensioning;

[0072] Figure 7 This is a schematic diagram of a pile connection structure according to an embodiment of the present invention;

[0073] Figure 8 for Figure 7 A construction schematic diagram of the pile splicing structure shown;

[0074] Figure 9 This is a schematic diagram of the pile connection structure according to another embodiment of the present invention;

[0075] Figure 10 for Figure 9 The diagram shows the construction schematic of the pile splicing structure.

[0076] The attached figures are labeled as follows:

[0077] The pile body is 100, the lower pile is 101, the upper pile is 102, the prestressed steel bar is 110, the first upset head is 111, the non-prestressed steel bar is 120, the second upset head is 121, and the stirrup is 130.

[0078] Internal thread 201, first sleeve 210, second sleeve 220, protrusion 221, retaining ring 222, flow hole 223;

[0079] Cementitious material 300;

[0080] Tensioning equipment 400, tensioning plate 410, fixing screws 420;

[0081] First connector 510, second connector 520;

[0082] Temporary padding block 600. Detailed Implementation

[0083] This disclosure provides the following description with reference to the accompanying drawings to aid in a full understanding of the various embodiments of the disclosure as defined by the claims and their equivalents. The description includes various specific details to aid understanding, but these details should be considered exemplary only. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of this disclosure. Furthermore, for clarity and brevity, descriptions of the functions and constructions of the disclosure may be omitted.

[0084] The terms and words used in the following description and claims are not limited to their literal meaning, but are merely used by the inventors to enable a clear and consistent understanding of this disclosure. Therefore, it will be clear to those skilled in the art that the following description of various embodiments of this disclosure is provided for illustrative purposes only, and not to limit the disclosure as defined by the appended claims and their equivalents.

[0085] The terms “having,” “may have,” “comprising,” or “may include” as used in the various embodiments of this disclosure indicate the presence of the corresponding functions, operations, elements, etc., disclosed, but do not limit one or more additional functions, operations, elements, etc. Furthermore, it should be understood that the terms “comprising” or “having” as used in the various embodiments of this disclosure are intended to indicate the presence of features, numbers, operations, elements, components, or combinations thereof described in the specification, but do not exclude the presence or addition of one or more other features, numbers, operations, elements, components, or combinations thereof.

[0086] It should be understood that when an element (e.g., the first element) is “connected” to another element (e.g., the second element), the element may be directly connected to the other element, or there may be an intermediary element (e.g., the third element) between the element and the other element.

[0087] An embodiment of the present invention provides a precast pile with mixed reinforcement, such as... Figure 1 and Figure 2 As shown, the pile includes a concrete pile body 100, within which prestressed steel bars 110 and non-prestressed steel bars 120 are embedded. Multiple prestressed and non-prestressed steel bars 110 and 120 are provided, and all extend along the length of the pile body 100. At least one end face of the pile body 100 along its length is fitted with a first sleeve 210 adapted to the prestressed steel bars 110 and a second sleeve 220 adapted to the non-prestressed steel bars 120. Here, "adapted" refers to both the quantity and position being compatible, such that each end of the prestressed steel bar 110 and each end of the non-prestressed steel bar 120 are respectively provided with a first sleeve 210 and a second sleeve 220. The central openings of both the first sleeve 210 and the second sleeve 220 are exposed on the end face of the pile body 100, and the inner walls of both the first sleeve 210 and the second sleeve 220 are provided with internal threads for connecting external screws.

[0088] The prestressed steel bar 110 is connected to the first sleeve 210. Specifically, a first upset head 111 is formed at the end of the prestressed steel bar 110, and the first upset head 111 is fixed in the first sleeve 210. The non-prestressed steel bar 120 is inserted into the second sleeve 220 from the end facing away from the pile body 100. The second sleeve 220 is filled with cementitious material 300. When tensioning the prestressed steel bar 110, the first sleeve 210 and the second sleeve 220 can be directly fixed to the tensioning plate. The tensioning equipment pulls the tensioning plate. Since the first sleeve 210 is connected to the prestressed steel bar 110, the prestressed steel bar 110 can be tensioned through the first sleeve 210. This eliminates the need for an end plate and reduces the amount of steel used. Meanwhile, before the cementitious material 300 solidifies, the non-prestressed steel bar 120 can move axially along the second sleeve 220. Therefore, when the prestressed steel bar 110 is tensioned, the non-prestressed steel bar 120 will not be subjected to tensile force, improving the pile's toughness and ductility. After the cementitious material 300 solidifies, it can seamlessly and rigidly fasten the second sleeve 220 and the non-prestressed steel bar 120 together, effectively improving the stability of the connection between the non-prestressed steel bar 120 and the second sleeve 220. This ensures the integrity of the entire precast pile with mixed reinforcement, thereby ensuring that the shear and bending resistance at the pile tip of a single pile and at the joint of two piles are relatively consistent with the middle of the pile.

[0089] In some embodiments, the inner wall of the second sleeve 220 is provided with a plurality of protrusions 221, which is equivalent to increasing the contact area between the cementitious material 300 and the inner wall of the second sleeve 220. At the same time, it increases the resistance to the cementitious material 300 moving out of the second sleeve 220 along the axial direction of the second sleeve 220, so that the cementitious material 300 can further fasten the second sleeve 220 and the non-prestressed steel bar 120 together.

[0090] Furthermore, the protrusion 221 surrounds the inner wall of the second sleeve 220, and it can be in the form of a ring or a spiral. This can further increase the contact area between the cementitious material 300 and the inner wall of the second sleeve 220, and the bonding force between the cementitious material 300 and the second sleeve 220 is relatively uniform in the circumferential direction of the inner wall of the second sleeve 220.

[0091] Furthermore, the protrusion 221 can be threaded, extending spirally within the second sleeve 220; or, the protrusion 221 can be annular, and the cross-sectional shape of the protrusion 221 can be triangular or arc-shaped, which makes the inner diameter of the second sleeve 220 vary.

[0092] In some embodiments, the cementitious material 300 includes, but is not limited to, concrete, sulfur mortar, resin materials and grouting cement. These materials are fluid before they solidify, so that they do not affect the movement of the non-prestressed steel bar 120 along the second sleeve 220 during the tensioning process.

[0093] In some embodiments, the end faces of both ends of the pile body 100 are fitted with a first sleeve 210 and a second sleeve 220, and the two ends of the prestressed steel bar 110 are respectively connected to the two first sleeves 210. The two ends of the non-prestressed steel bar 120 are respectively inserted into the two second sleeves 220, and both second sleeves 220 are filled with the aforementioned cementitious material 300. This facilitates the connection of two precast piles with mixed reinforcement into a series assembly using connectors, ensuring that the mechanical properties at the pile joint are consistent with those of the pile body.

[0094] In some embodiments, a spiral stirrup 130 is also embedded in the pile body 100. The spiral stirrup 130 is wound around the prestressed steel bar 110 and the non-prestressed steel bar 120 to form a steel cage.

[0095] Embodiments of the present invention provide a method for manufacturing a precast pile with hybrid reinforcement according to any of the above embodiments, such as... Figure 3 As shown, it includes the following steps:

[0096] (1) Pass the prestressed steel bar 110 through the first sleeve 210 and connect the prestressed steel bar 110 to the first sleeve 210. Wrap stirrups around the prestressed steel bar 110 and the non-prestressed steel bar 120 to make a steel cage. The end of the prestressed steel bar 110 can be upset to form a first upset head 111 at the end of the prestressed steel bar 110. The first upset head 111 is fixed in the first sleeve 210. When the first sleeve 210 moves in the tensioning direction, the first upset head 111 will not detach from the first sleeve 210. The stirrups can be welded to the prestressed steel bar 110 and the non-prestressed steel bar 120 using a roll welding machine, or the steel cage can be made by binding.

[0097] (2) Insert the end of the non-prestressed steel bar 120 into the second sleeve 220, and then fix the first sleeve 210 and the second sleeve 220 to the back of the tension plate 410 by fixing screws 420; the tension plate 410 is provided with multiple through holes, and the fixing screws 420 pass through the through holes and are threaded to the first sleeve 210 and the second sleeve 220 respectively, so as to fix the first sleeve 210 and the second sleeve 220 to the back of the tension plate 410;

[0098] (3) Place the assembled steel cage and tension plate 410 into the mold, and connect the tension plate 410 to the tensioning equipment 400;

[0099] (4) The tensioning plate 410 is pulled forward by the tensioning device 400 to move forward a preset distance to tension the prestressed steel bar 110; at this time, the non-prestressed steel bar 120 moves backward relative to the second sleeve 220 and the non-prestressed steel bar 120 will not be subjected to tension.

[0100] (5) Inject concrete into the mold, and use vibration compaction or centrifugal molding process to make some concrete flow into the second sleeve 220, and make the concrete form and compact in the mold; In this embodiment, the cementitious material 300 in the second sleeve 220 is the concrete that constitutes the pile body 100, which saves the process of manually filling the cementitious material 300.

[0101] (6) After the concrete has solidified, open the mold, remove the fixing screws 420 on the tension plate 410, so that both the first sleeve 210 and the second sleeve 220 are separated from the tension plate 410, and then take out the formed precast pile. At this time, the concrete in the second sleeve 220 has also solidified, thereby fastening the non-prestressed steel bar 120 to the second sleeve 220.

[0102] Embodiments of the present invention provide another method for manufacturing precast piles with hybrid reinforcement according to any of the above embodiments, such as... Figure 3 As shown, it includes the following steps:

[0103] (1) Fix the second sleeve 220 to the back of the tensioning plate 410 by fixing screw 420;

[0104] (2) Pass the prestressed steel bar 110 through the first sleeve 210 and connect the prestressed steel bar 110 to the first sleeve 210, and wrap stirrups around the prestressed steel bar 110 and the non-prestressed steel bar 120 to make a steel cage;

[0105] (3) Insert the end of the non-prestressed steel bar 120 into the second sleeve 220, fill the second sleeve 220 with cementitious material 300, and then fix the first sleeve 210 to the back of the tension plate 410 by fixing screws 420.

[0106] (4) Place the assembled steel cage and tension plate 410 into the mold, and connect the tension plate 410 to the tensioning equipment 400;

[0107] (5) The tensioning plate 410 is moved forward a preset distance by the tensioning equipment 400 to tension the prestressed steel bar 110;

[0108] (6) Inject concrete into the mold and use vibration compaction or centrifugal molding process to make the concrete form and compact in the mold;

[0109] (7) After the concrete has solidified, open the mold, remove the fixing screws 420 on the tension plate 410, so that the first sleeve 210 and the second sleeve 220 are separated from the tension plate 410, and then take out the formed precast pile.

[0110] Compared with the previous embodiment, in this embodiment, the cementitious material 300 is injected into the second sleeve 220 in advance. This can avoid the problem that the concrete is not filled into the second sleeve 220 or the filling amount is insufficient due to imperfect vibration compaction or centrifugal molding process.

[0111] Embodiments of the present invention also provide another type of precast pile with mixed reinforcement, such as Figure 4 and Figure 5As shown, the pile includes a concrete pile body 100, within which prestressed steel bars 110 and non-prestressed steel bars 120 are embedded. Multiple prestressed and non-prestressed steel bars 110 and 120 are provided, and all extend along the length of the pile body 100. At least one end face of the pile body 100 along its length is fitted with a first sleeve 210 adapted to the prestressed steel bars 110 and a second sleeve 220 adapted to the non-prestressed steel bars 120. Here, "adapted" refers to both the quantity and position being compatible, such that each end of the prestressed steel bar 110 and each end of the non-prestressed steel bar 120 are respectively provided with a first sleeve 210 and a second sleeve 220. The central openings of both the first sleeve 210 and the second sleeve 220 are exposed on the end face of the pile body 100, and the inner walls of both the first sleeve 210 and the second sleeve 220 are provided with internal threads for connecting external screws.

[0112] The prestressed steel bar 110 is connected to the first sleeve 210. Specifically, a first upset head 111 is formed at the end of the prestressed steel bar 110, and the first upset head 111 is fixed in the first sleeve 210. The end of the non-prestressed steel bar 120 near the second sleeve 220 is upset to form a second upset head 121, which is inserted into the second sleeve 220. A retaining ring 222 is provided on the inner wall of the end of the second sleeve 220 near the non-prestressed steel bar 120. The retaining ring 222 surrounds the inner wall of the second sleeve 220. The inner diameter of the retaining ring 222 is larger than the diameter of the non-prestressed steel bar 120 and smaller than the diameter of the second upset head 121. In this way, the retaining ring 222 can hold the second upset head 121, restricting the separation of the non-prestressed steel bar 120 from the second sleeve 220. At the same time, the non-prestressed steel bar 120 can move within the retaining ring 222. When the prestressed steel bar 110 is tensioned, the non-prestressed steel bar 120 can move relative to the second sleeve 220, preventing the non-prestressed steel bar 120 from being tensioned. Simultaneously, the portion of the second sleeve 220 located between the second upset head 121 and the retaining ring 222 is filled with cementitious material 300. Since the first sleeve 210 is connected to the prestressed steel bar 110, the prestressed steel bar 110 can be tensioned through the first sleeve 210, thus eliminating the need for end plates and reducing the amount of steel used. Meanwhile, before the cementitious material 300 solidifies, the non-prestressed steel bar 120 can move axially along the second sleeve 220. Therefore, when the prestressed steel bar 110 is tensioned, the non-prestressed steel bar 120 will not be subjected to tensile force, improving the pile's toughness and ductility. After the cementitious material 300 solidifies, it can seamlessly and rigidly fasten the second sleeve 220 and the non-prestressed steel bar 120 together, effectively improving the stability of the connection between the non-prestressed steel bar 120 and the second sleeve 220. This ensures the integrity of the entire precast pile with mixed reinforcement, thereby ensuring that the shear and bending resistance at the pile tip of a single pile and at the joint of two piles are relatively consistent with the middle of the pile.

[0113] In one embodiment, the cementitious material 300 can be pre-injected into the second sleeve 220. During tensioning, the second upsetting head 121 moves toward the retaining ring 222, and excess cementitious material 300 can be squeezed out through the central hole of the retaining ring 222. In another embodiment, the cementitious material 300 can be the concrete that makes up the pile body 100. During the molding process of the pile body 100, due to vibration compaction or centrifugal molding, a portion of the concrete fills into the second sleeve 220.

[0114] Considering that the flow rate of the cementitious material 300 would be very slow if it were only supplied through the central hole of the retaining ring 222, this embodiment provides a through flow hole 223 on the side wall of the second sleeve 220 near the retaining ring 222 to supply the flow of the cementitious material 300. The cementitious material 300 can flow out of the second sleeve 220 through the flow hole 223, and at the same time, the cementitious material 300 can also flow into the second sleeve 220 from the outside through the flow hole 223 to increase the flow rate of the cementitious material 300.

[0115] In some embodiments, the cementitious material 300 includes, but is not limited to, concrete, sulfur mortar, resin materials and grouting cement. These materials are fluid before they solidify, so that they do not affect the movement of the non-prestressed steel bar 120 along the second sleeve 220 during the tensioning process.

[0116] In some embodiments, the first sleeve 210 and the second sleeve 220 are embedded in the end faces of both ends of the pile body 100, and the two ends of the prestressed steel bar 110 are respectively connected to the two first sleeves 210. The two ends of the non-prestressed steel bar 120 each form a second upset head 121. The two second upset heads 121 pass through the retaining ring 222 and are then inserted into the two second sleeves 220. The portion of the second sleeve 220 located between the second upset head 121 and the retaining ring 222 is filled with a cementitious material 300. This facilitates the connection of two precast piles with mixed reinforcement into a series assembly using connectors, ensuring that the mechanical properties at the joint are consistent with the pile body.

[0117] In some embodiments, a spiral stirrup 130 is also embedded in the pile body 100. The spiral stirrup 130 is wound around the prestressed steel bar 110 and the non-prestressed steel bar 120 to form a steel cage.

[0118] An embodiment of the present invention provides a method for manufacturing the above-mentioned precast pile with mixed reinforcement, such as... Figure 6 As shown, it includes the following steps:

[0119] (1) Pass the prestressed steel bar 110 through the first sleeve 210 and connect the prestressed steel bar 110 to the first sleeve 210. Pass one end of the non-prestressed steel bar 120 through the retaining ring 222 and insert it into the second sleeve 220. The end of the prestressed steel bar 110 can be upset to form a first upset head 111 at the end of the prestressed steel bar 110. The first upset head 111 is fixed in the first sleeve 210. When the first sleeve 210 moves in the tensioning direction, the first upset head 111 will not detach from the first sleeve 210.

[0120] (2) The end of the non-prestressed steel bar 120 is upset to form a second upset head 121. The diameter of the second upset head 121 is larger than the inner diameter of the retaining ring 222 and smaller than the inner diameter of the second sleeve 220. This allows the retaining ring 222 to hold the second upset head 121, restricting the separation of the non-prestressed steel bar 120 from the second sleeve 220. At the same time, the non-prestressed steel bar 120 can move in the retaining ring 222.

[0121] (3) Wrap stirrups 130 around prestressed steel bars 110 and non-prestressed steel bars 120 to make a steel cage; specifically, a roller welding machine can be used to weld the stirrups onto the prestressed steel bars 110 and non-prestressed steel bars 120 to form a steel cage, or the stirrups can be tied onto the prestressed steel bars 110 and non-prestressed steel bars 120 by manual binding to make a steel cage.

[0122] (4) The first sleeve 210 and the second sleeve 220 are both fixed to the back of the tension plate 410 by fixing screws 420; the tension plate 410 is provided with multiple through holes, and the fixing screws 420 pass through the through holes and are threaded to the first sleeve 210 and the second sleeve 220 respectively, so as to fix the first sleeve 210 and the second sleeve 220 to the back of the tension plate 410.

[0123] (5) Place the assembled steel cage and tension plate 410 into the mold, and connect the tension plate 410 to the tensioning equipment 400.

[0124] (6) The tension plate 410 is moved forward a preset distance by the tensioning device 400 to tension the prestressed steel bar 110; at this time, the non-prestressed steel bar 120 moves backward relative to the second sleeve 220 and the non-prestressed steel bar 120 will not be subjected to tension.

[0125] (7) Inject concrete into the mold, and use vibration compaction or centrifugal molding process to make some concrete flow into the second sleeve 220, and make the concrete form and compact in the mold; In this embodiment, the cementitious material 300 in the second sleeve 220 is the concrete that constitutes the pile body 100, which saves the process of manually filling the cementitious material 300.

[0126] (8) After the concrete has solidified, open the mold, remove the fixing screws 420 on the tension plate 410, so that both the first sleeve 210 and the second sleeve 220 are separated from the tension plate 410, and then take out the formed precast pile. At this time, the concrete in the second sleeve 220 has also solidified, thereby fastening the non-prestressed steel bar 120 to the second sleeve 220.

[0127] Embodiments of the present invention provide another method for manufacturing the above-mentioned precast piles with mixed reinforcement, such as... Figure 6 As shown, it includes the following steps:

[0128] (1) Pass the prestressed steel bar 110 through the first sleeve 210 and connect the prestressed steel bar 110 to the first sleeve 210. Pass one end of the non-prestressed steel bar 120 through the retaining ring 222 and insert it into the second sleeve 220.

[0129] (2) The end of the non-prestressed steel bar 120 is upset to form a second upset head 121. The diameter of the second upset head 121 is greater than the inner diameter of the retaining ring 222, and the diameter of the second upset head 121 is smaller than the inner diameter of the second sleeve 220.

[0130] (3) Wrap stirrups 130 around prestressed steel bars 110 and non-prestressed steel bars 120 to make a steel cage;

[0131] (4) Fix the first sleeve 210 and the second sleeve 220 to the back of the tensioning plate 410 by fixing screws 420;

[0132] (5) Place the assembled steel cage and tension plate 410 into the mold, and connect the tension plate 410 to the tensioning equipment 400.

[0133] (6) Fill the portion of the second sleeve 220 between the second upsetting head 121 and the retaining ring 222 with cementing material 300;

[0134] (7) The tensioning plate 410 is moved forward a preset distance by the tensioning equipment 400 to tension the prestressed steel bar 110;

[0135] (8) Inject concrete into the mold and use vibration compaction or centrifugal molding process to make the concrete form and compact in the mold;

[0136] (9) After the concrete has solidified, open the mold, remove the fixing screws 420 on the tension plate 410, so that the first sleeve 210 and the second sleeve 220 are separated from the tension plate 410, and then take out the formed precast pile.

[0137] Compared with the previous embodiment, in this embodiment, the cementitious material 300 is injected into the second sleeve 220 in advance. This can avoid the problem that the concrete is not filled into the second sleeve 220 or the filling amount is insufficient due to imperfect vibration compaction or centrifugal molding process.

[0138] Embodiments of the present invention provide a pile splicing structure comprising multiple precast piles with mixed reinforcement as described in any of the above embodiments. The specific structure of the precast piles with mixed reinforcement can be found in the above embodiments and will not be repeated here. Figure 7As shown, the precast piles with mixed reinforcement are arranged sequentially along the length of the pile body. All precast piles with mixed reinforcement can be installed vertically and connected sequentially from bottom to top. For easy distinction, the lower one of two adjacent precast piles with mixed reinforcement is called the lower pile 101, and the upper one is called the upper pile 102. Multiple first connectors 510 and second connectors 520 are provided between the lower pile 101 and the upper pile 102. The two ends of the first connectors 510 are connected to the first sleeves 210 of the two adjacent pile bodies, and the two ends of the second connectors 520 are connected to the second sleeves 220 of the two adjacent pile bodies. This allows adjacent precast piles with mixed reinforcement to be connected together to form a series unit, ensuring that the mechanical properties at the joint are consistent with the pile body.

[0139] Regarding the specific connection method of the first connector 510 and the second connector 520, the present invention provides the following three embodiments, and provides the construction method corresponding to each embodiment.

[0140] In some embodiments, the lower ends of the first connector 510 and the second connector 520 are respectively inserted into the first sleeve 210 and the second sleeve 220 at the top of the lower pile 101, and the space between the first connector 510 and the first sleeve 210 at the top of the lower pile 101, and between the second connector 520 and the second sleeve 220 at the top of the lower pile 102, is filled with a cementitious material 300. The upper ends of the first connector 510 and the second connector 520 are both provided with external threads, and are threadedly connected to the first sleeve 210 and the second sleeve 220 at the bottom of the upper pile 102, respectively. That is, the upper end of the first connector 510 and the lower end of the second connector 520 are connected to the lower pile 101 by the holding force generated after the cementitious material 300 solidifies, while the upper ends of the first connector 510 and the second connector 520 are connected to the upper pile 102 by threaded connection.

[0141] Accordingly, this embodiment also provides a construction method for the pile splicing structure, such as... Figure 8 As shown, it includes the following steps:

[0142] (1) Drive the lower section of pile 101 into the ground a predetermined distance, specifically 0.8-1.2m into the ground;

[0143] (2) Screw the upper ends of the first connector 510 and the second connector 520 into the first sleeve 210 and the second sleeve 220 at the bottom of the upper section pile 102, respectively, so that the upper end of the first connector 510 is threadedly connected to the first sleeve 210 at the bottom of the upper section pile 102, and the upper end of the second connector 520 is threadedly connected to the second sleeve 220 at the bottom of the upper section pile 102.

[0144] (3) A cementitious material 300 is injected into the first sleeve 210 and the second sleeve 220 at the top of the lower section pile 101. The cementitious material 300 includes, but is not limited to, concrete, sulfur mortar, resin material and grouting cement.

[0145] (4) Lift the upper section 102 and adjust its position so that the upper section 102 is accurately aligned with the lower section 101. Specifically, the first connector 510 is aligned with the first sleeve 210 at the top of the lower section 101, and the second connector 520 is aligned with the second sleeve 220 at the top of the lower section 101. Then, insert the lower ends of the first connector 510 and the second connector 520 into the first sleeve 210 and the second sleeve 220 at the top of the lower section 101, so that the lower ends of the first connector 510 and the second connector 520 are fully wrapped by the cementitious material 300.

[0146] (5) Wait for the cementitious material 300 in the first sleeve 210 and the second sleeve 220 at the top of the lower section pile 101 to solidify and harden, so that the upper section pile 102 and the lower section pile 101 can be connected together.

[0147] In some embodiments, the lower ends of the first connector and the second connector are respectively inserted into the first sleeve and the second sleeve at the top of the lower pile section in two adjacent precast piles with mixed reinforcement, and the space between the first connector and the first sleeve at the top of the lower pile section, as well as the space between the second connector and the second sleeve at the top of the lower pile section, is filled with cementitious material. The upper ends of the first connector and the second connector are respectively inserted into the first sleeve and the second sleeve at the bottom of the upper pile in two adjacent precast piles with mixed reinforcement, and the space between the first connector and the first sleeve at the bottom of the upper pile section, as well as the space between the second connector and the second sleeve at the bottom of the upper pile section, is filled with cementitious material. That is, the upper end of the first connector and the lower end of the second connector are connected to the lower pile section by the bonding force generated after the cementitious material solidifies, and the upper end of the first connector and the upper end of the second connector are connected to the upper pile section by the bonding force generated after the cementitious material solidifies.

[0148] Accordingly, this embodiment also provides a construction method for the pile splicing structure, including the following steps:

[0149] (1) Drive the lower section of the pile into the ground a predetermined distance, specifically 0.8-1.2m.

[0150] (2) Inject cementitious material into the first sleeve and the second sleeve at the bottom of the upper section of the pile, insert the upper ends of the first connector and the second connector into the first sleeve and the second sleeve at the bottom of the upper section of the pile respectively, and wait for the cementitious material in the first sleeve and the second sleeve at the bottom of the upper section of the pile to solidify and harden. In this way, the first connector and the second connector are fixed in the first sleeve and the second sleeve at the bottom of the upper section of the pile respectively.

[0151] (3) A cementitious material is injected into the first sleeve and the second sleeve at the top of the lower section pile. The cementitious material in the first sleeve and the second sleeve at the top of the lower section pile and the cementitious material in the first sleeve and the second sleeve at the bottom of the upper section pile are including but not limited to concrete, sulfur mortar, resin material and grouting cement.

[0152] (4) Lift the upper section of the pile and adjust its position so that the upper section of the pile is accurately aligned with the lower section of the pile. Specifically, the first connector is aligned with the first sleeve at the top of the lower section of the pile, and the second connector is aligned with the second sleeve at the top of the lower section of the pile. Insert the lower ends of the first connector and the second connector into the first sleeve and the second sleeve at the top of the lower section of the pile, respectively, so that the lower ends of the first connector and the second connector are fully wrapped with cementitious material.

[0153] (5) Wait for the cementitious material in the first and second sleeves at the top of the lower pile to solidify and harden, so that the upper and lower piles can be connected together.

[0154] In some embodiments, such as Figure 9 As shown, the first connecting member 510 and the second connecting member 520 are respectively the first connecting bolt and the second connecting bolt. The upper ends of the first connecting bolt and the second connecting bolt are threadedly connected to the first sleeve 210 and the second sleeve 220 at the bottom of the upper pile 102, respectively. The lower ends of the first connecting bolt and the second connecting bolt are threadedly connected to the first sleeve 210 and the second sleeve 220 at the top of the lower pile 101, respectively. That is, both ends of the first connecting bolt and the second connecting bolt are connected to the upper pile 102 and the lower pile 101 by means of threaded connection.

[0155] Accordingly, this embodiment also provides a construction method for the pile splicing structure, including the following steps:

[0156] (1) Drive the lower section of pile 101 into the ground a predetermined distance, specifically 0.8-1.2m into the ground;

[0157] (2) Lift the upper section 102 and adjust its position so that the upper section 102 and the lower section 101 are accurately aligned. Specifically, the first sleeve 210 at the bottom of the upper section 102 is aligned with the first sleeve 210 at the top of the lower section 101, and the second sleeve 220 at the bottom of the upper section 102 is aligned with the second sleeve 220 at the top of the lower section 101. Place multiple temporary pads 600 on the end face at the top of the lower section 101. The lengths of the first connecting bolt and the second connecting bolt are the same as the height of the temporary pads 600.

[0158] (3) The upper section 102 is dropped vertically onto the temporary pad 600. Multiple first connecting bolts and second connecting bolts are placed between the upper section 102 and the lower section 101. The two ends of the first connecting bolts are screwed into the first sleeves 210 of the upper section 102 and the lower section 101, respectively. The two ends of the second connecting bolts are screwed into the second sleeves 220 of the upper section 102 and the lower section 101, respectively. Because the pipe pile is heavy, the temporary pad 600 will be compressed to a certain extent after the upper section 102 is dropped vertically onto the temporary pad 600. The height of the temporary pad 600 becomes slightly less than the length of the first connecting bolt and also slightly less than the length of the second connecting bolt. Therefore, the two ends of the first connecting bolt can be screwed into the first sleeves 210 of the upper section 102 and the lower section 101, respectively, and the two ends of the second connecting bolt can be screwed into the second sleeves 220 of the upper section 102 and the lower section 101, respectively.

[0159] (4) After removing the temporary pad 600, a wrench or other tools can be used to rotate the first connecting bolt and the second connecting bolt, so that the two ends of the first connecting bolt are simultaneously rotated and anchored into the first sleeve 210 of the upper section pile 102 and the lower section pile 101, and the two ends of the second connecting bolt are simultaneously rotated and anchored into the second sleeve 220 of the upper section pile 102 and the lower section pile 101, so that the upper section pile 102 and the lower section pile 101 can be connected together.

[0160] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention, but it should not be construed as limiting the specific implementation of the invention to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention.

Claims

1. A method of manufacturing a hybrid reinforced precast pile, characterized by, The mixed reinforcement prefabricated pile comprises a pile body made of concrete, a plurality of prestressed steel bars and non-prestressed steel bars are embedded in the pile body, a first sleeve matched with the prestressed steel bars and a second sleeve matched with the non-prestressed steel bars are embedded in the end face of at least one end of the pile body, the inner walls of the first sleeve and the second sleeve are provided with internal threads, the prestressed steel bars are connected with the first sleeve, the end portions of the non-prestressed steel bars are inserted into the second sleeve, and the second sleeve is filled with cementing material, and the manufacturing method comprises the following steps: (1) the prestressed steel bars are inserted through the first sleeve and connected with the first sleeve, the stirrups are wound on the prestressed steel bars and the non-prestressed steel bars to make a steel cage; (2) the end portions of the non-prestressed steel bars are inserted into the second sleeve, and the first sleeve and the second sleeve are fixed on the back of the tensioning plate through fixing screws; (3) the assembled steel cage and the tensioning plate are placed in a mold, and the tensioning plate is connected with a tensioning device; (4) the tensioning plate is pulled forward by a preset distance through the tensioning device to tension the prestressed steel bars; (5) the mold is injected with concrete, and part of the concrete is caused to flow into the second sleeve by using a vibrating compaction or centrifugal molding process, and the concrete is caused to be molded and compacted in the mold; (6) after the concrete is solidified and molded, the mold is opened, the fixing screws on the tensioning plate are removed, the first sleeve and the second sleeve are separated from the tensioning plate, and the molded prefabricated pile is taken out.

2. The method of manufacturing a hybrid reinforced precast pile according to claim 1, wherein: The inner wall of the second sleeve is provided with a plurality of protrusions.

3. A method of manufacturing a hybrid reinforced precast pile, characterized by, The mixed reinforcement prefabricated pile comprises a pile body made of concrete, a plurality of prestressed steel bars and non-prestressed steel bars are embedded in the pile body, a first sleeve matched with the prestressed steel bars and a second sleeve matched with the non-prestressed steel bars are embedded in the end face of at least one end of the pile body, the inner walls of the first sleeve and the second sleeve are provided with internal threads, the prestressed steel bars are connected with the first sleeve, the end portions of the non-prestressed steel bars are inserted into the second sleeve, and the second sleeve is filled with cementing material, and the manufacturing method comprises the following steps: (1) the second sleeve is fixed on the back of the tensioning plate through fixing screws; (2) the prestressed steel bars are inserted through the first sleeve and connected with the first sleeve, the stirrups are wound on the prestressed steel bars and the non-prestressed steel bars to make a steel cage; (3) the end portions of the non-prestressed steel bars are inserted into the second sleeve, and the second sleeve is filled with cementing material, and the first sleeve is fixed on the back of the tensioning plate through fixing screws; (4) the assembled steel cage and the tensioning plate are placed in a mold, and the tensioning plate is connected with a tensioning device; (5) the tensioning plate is pulled forward by a preset distance through the tensioning device to tension the prestressed steel bars; (6) the mold is injected with concrete, and the concrete is caused to be molded and compacted in the mold by using a vibrating compaction or centrifugal molding process; (7) after the concrete is solidified and molded, the mold is opened, the fixing screws on the tensioning plate are removed, the first sleeve and the second sleeve are separated from the tensioning plate, and the molded prefabricated pile is taken out.

4. The method of manufacturing a hybrid reinforced precast pile according to claim 3, wherein: The inner wall of the second sleeve is provided with a plurality of protrusions.

5. A method of manufacturing a hybrid reinforced precast pile, characterized by, The mixed reinforcement prefabricated pile comprises a pile body made of concrete, a plurality of prestressed steel bars and non-prestressed steel bars are embedded in the pile body; a first sleeve matched with the prestressed steel bars and a second sleeve matched with the non-prestressed steel bars are embedded in the end face of at least one end of the pile body, and internal threads are arranged on the inner walls of the first sleeve and the second sleeve; the prestressed steel bars are connected with the first sleeve, the non-prestressed steel bars form a head near the end inserted into the second sleeve, a snap ring is arranged on the inner wall of the end of the second sleeve close to the non-prestressed steel bars, the inner diameter of the snap ring is greater than the diameter of the non-prestressed steel bars, and the inner diameter of the snap ring is smaller than the diameter of the head; a portion of the second sleeve between the head and the snap ring is filled with cementitious material; the manufacturing method comprises the following steps: (1) the prestressed steel bars are inserted through the first sleeve and connected with the first sleeve, and one end of the non-prestressed steel bars is inserted through the snap ring and into the second sleeve; (2) the head treatment is performed on the end of the non-prestressed steel bars, the diameter of the head is greater than the inner diameter of the snap ring, and the diameter of the head is smaller than the inner diameter of the second sleeve; (3) the stirrups are wound on the prestressed steel bars and the non-prestressed steel bars to manufacture the steel cage; (4) the first sleeve and the second sleeve are fixed on the back of the tensioning plate through fixing screws; (5) the assembled steel cage and the tensioning plate are placed in the mold, and the tensioning plate is connected with the tensioning equipment; (6) the tensioning plate is pulled forward by a preset distance through the tensioning equipment to tension the prestressed steel bars; (7) the concrete is injected into the mold, part of the concrete is made to flow into the second sleeve by using the vibration compaction or centrifugal molding process, and the concrete is formed and compacted in the mold; (8) after the concrete is solidified and formed, the mold is opened, the fixing screws on the tensioning plate are removed, the first sleeve and the second sleeve are separated from the tensioning plate, and the formed prefabricated pile is taken out.

6. The method of manufacturing a hybrid reinforced precast pile according to claim 5, wherein: The side wall of the end of the second sleeve close to the non-prestressed steel bars is provided with a flow hole penetrating through, for the flow of the cementitious material.

7. A method of manufacturing a hybrid reinforced precast pile, characterized by, The mixed reinforcement prefabricated pile comprises a pile body made of concrete, a plurality of prestressed steel bars and non-prestressed steel bars are embedded in the pile body; a first sleeve matched with the prestressed steel bars and a second sleeve matched with the non-prestressed steel bars are embedded in the end face of at least one end of the pile body, and internal threads are arranged on the inner walls of the first sleeve and the second sleeve; the prestressed steel bars are connected with the first sleeve, the non-prestressed steel bars form a head near the end inserted into the second sleeve, a snap ring is arranged on the inner wall of the end of the second sleeve close to the non-prestressed steel bars, the inner diameter of the snap ring is greater than the diameter of the non-prestressed steel bars, and the inner diameter of the snap ring is smaller than the diameter of the head; a portion of the second sleeve between the head and the snap ring is filled with cementitious material; the manufacturing method comprises the following steps: (1) the prestressed steel bars are inserted through the first sleeve and connected with the first sleeve, and one end of the non-prestressed steel bars is inserted through the snap ring and into the second sleeve; (2) the end of the non-prestressed steel bar is subjected to upsetting treatment, the diameter of the upsetting head is greater than the inner diameter of the snap ring, and the diameter of the upsetting head is less than the inner diameter of the second sleeve; (3) a stirrup is wound on the prestressed steel bar and the non-prestressed steel bar to make a steel cage; (4) the first sleeve and the second sleeve are fixed on the back of the tensioning plate through fixing screws; (5) the assembled steel cage and the tensioning plate are placed into a mold, and the tensioning plate is connected with a tensioning device; (6) the second sleeve between the upsetting head and the snap ring is filled with cementitious material; (7) the tensioning plate is pulled forward by a preset distance through the tensioning device to tension the prestressed steel bar; (8) concrete is injected into the mold, and the concrete is formed and compacted in the mold by using a vibrating and compacting process or a centrifugal forming process; (9) after the concrete is solidified and formed, the mold is opened, the fixing screws on the tensioning plate are removed, the first sleeve and the second sleeve are separated from the tensioning plate, and then the formed precast pile is taken out.

8. The method of manufacturing a hybrid reinforced precast pile according to claim 7, wherein: The side wall of the second sleeve near the end of the non-prestressed steel bar is provided with a flow hole penetrating through, for the flow of cementitious material.

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