A mixed reinforced prefabricated pile and production method thereof

Abstract

The present invention provides a mixed reinforced prefabricated pile and a production method thereof, comprising a concrete pile body and a pile end anchor plate; the concrete pile body is provided with prestressed steel bars, non-prestressed steel bars and spiral stirrups; the spiral stirrups are wound around the prestressed steel bars and non-prestressed steel bars to form a steel skeleton cage, and the concrete wraps the prestressed steel bars, non-prestressed steel bars and spiral stirrups; the pile end anchor plate is at least provided at one end of the concrete pile body, and the end of the prestressed steel bar is connected to the pile end anchor plate; at least one end of the non-prestressed steel bar is provided with a connecting piece; the non-prestressed steel bar is anchored to the concrete or connected to the pile end anchor plate through the connecting piece. The present invention reduces the deformation of the end of the pile under horizontal bearing capacity, improves the rigidity of the end, has the characteristics of simple structure, high pull-out resistance and horizontal bearing capacity, low cost, high construction efficiency, etc., and can effectively improve the displacement ductility of the pile body and the quality of the connection between piles.

Description

Technical Field

[0001] The invention belongs to the technical field of building pile foundation engineering, and in particular relates to a mixed reinforced prefabricated pile and a production method thereof. Background Art

[0002] At present, with the increasing importance of modern buildings and the continuous increase in building height, higher requirements are placed on the performance of building foundations. In areas with high requirements for seismic fortification, the building foundation must not only meet the requirements of vertical compressive loads, but also meet the requirements of seismic fortification. In projects with large horizontal bearing capacity such as foundation pit support, slope protection, and columns, higher seismic performance requirements are placed on the pile body. This requires the piles in the building foundation to meet both vertical compressive and seismic requirements. Although the precast concrete piles cast on site can meet both requirements after calculation and design, on-site casting has a great pollution to the environment, and the construction period is long. After casting, it takes one month to continue construction, and the cost is high. Without considering the influence of horizontal bearing capacity factors, the prestressed high-strength concrete centrifugal piles prefabricated in the factory have high vertical bearing capacity, short construction period, convenient production and transportation, and low cost. They are more suitable for projects with vertical bearing capacity, but they have shortcomings such as poor displacement ductility and are not suitable for projects with large horizontal loads. Summary of the invention

[0003] In view of the above technical problems, the purpose of the present invention is to provide a mixed reinforced prefabricated pile and a production method thereof, which can reduce the deformation of the end of the pile under horizontal bearing capacity and improve the stiffness of the end. It has the characteristics of simple structure, high pull-out resistance and horizontal bearing capacity, low cost, high construction efficiency, etc., and can effectively improve the displacement ductility of the pile body and the quality of the connection between piles.

[0004] The technical solution of the present invention is: a mixed reinforced prefabricated pile, comprising a concrete pile body and a pile end anchor plate; prestressed steel bars, non-prestressed steel bars and spiral stirrups are arranged in the concrete pile body; the spiral stirrups are wound around the prestressed steel bars and non-prestressed steel bars to form a steel skeleton cage, and concrete wraps the prestressed steel bars, non-prestressed steel bars and spiral stirrups; the pile end anchor plate is arranged at least at one end of the concrete pile body, and the end of the prestressed steel bar is connected to the pile end anchor plate; at least one end of the non-prestressed steel bar is provided with a connecting piece; the non-prestressed steel bar is anchored to the concrete or connected to the pile end anchor plate through the connecting piece.

[0005] In the above solution, the connecting member is a non-prestressed steel bar anchor plate; the non-prestressed steel bar anchor plate is wrapped by concrete, and the non-prestressed steel bars are anchored to the concrete through the non-prestressed steel bar anchor plate.

[0006] In the above scheme, the connecting member is a connecting conversion member; one end of the connecting conversion member is connected to the non-prestressed steel bar, and the other end is connected to the pile end anchor plate.

[0007] Furthermore, the connection conversion part includes a connecting rod, a connecting tube and a connecting tube; one end of the connecting rod is connected to the pile end anchor plate, the other end of the connecting rod is axially slidingly connected to one end of the connecting tube, the other end of the connecting tube is connected to one end of the connecting tube, and the other end of the connecting tube is connected to the end of the non-prestressed steel bar.

[0008] Furthermore, a first sliding portion is provided at one end of the connecting tube, and a second clamping platform is provided at the other end; a second sliding portion is provided at one end of the connecting tube, and an elastic undercut is provided at the other end; the first sliding portion and the second sliding portion are slidably connected, and after the non-prestressed steel bar is tensioned, the second clamping platform can be clamped in the elastic undercut.

[0009] The above scheme also includes a pile collar; the pile collar is arranged on the concrete outer surface of at least one end of the concrete pile body and is connected to the groove of the pile end anchor plate.

[0010] Furthermore, shear nails are arranged inside the pile sleeve or the inner side of the pile sleeve is arranged to be wavy.

[0011] In the above solution, the pile end anchor plates are provided with joints, and the pile end anchor plates are connected to form a whole at the joints.

[0012] In the above solution, the inner circle of the pile end anchor plate is evenly provided with a plurality of latching teeth facing the center of the pile end anchor plate.

[0013] In the above scheme, the prestressed steel bar includes a steel bar body and an upset cap; at least one end of the steel bar body is provided with an upset cap, the upset cap passes through the end face of the steel bar body and is located in the prestressed steel bar anchor hole of the pile end anchor plate.

[0014] Furthermore, a plurality of continuous spiral grooves are evenly distributed circumferentially on the outer surfaces of the steel bar body and the upsetting cap, and the spiral angle β of the spiral grooves is 35° to 60°.

[0015] In the above solution, a boss is provided on the top of the upsetting cap.

[0016] In the above scheme, the upsetting cap is divided into an upper convex part and a lower concave part at the maximum diameter, the lower concave part is connected to the steel bar body, and the ratio of the height of the upper convex part to the height of the lower concave part is 1 / 8 to 1 / 2.

[0017] In the above solution, the pile end anchoring plate is provided with a first clamping platform, and the first clamping platform of the pile end anchoring plate is used to dock with the clamping platform of the connecting clamp.

[0018] A production method of the mixed reinforced prefabricated piles comprises the following steps:

[0019] The fixed-length cutting and processing of the prestressed steel bars: after the prestressed steel bars are cut according to the design requirements, at least one end of the prestressed steel bars is processed into a pier cap;

[0020] Fixed-length cutting of non-prestressed steel bars: After cutting the non-prestressed steel bars according to the design requirements, at least one end of the non-prestressed steel bars shall be threaded;

[0021] Steel bar cage: prestressed steel bars, non-prestressed steel bars and threaded stirrups form an integrated steel bar cage;

[0022] Installation of connectors: Install the connectors at the ends of non-prestressed steel bars in sequence;

[0023] Mould treatment: Apply an isolation agent to the upper and lower moulds for producing precast mixed reinforced piles;

[0024] Processing and installation of the pile end anchor plate: a joint is set on the pile end anchor plate, and the pile end anchor plate is connected to form a whole at the joint. A plurality of clamping teeth facing the center of the pile end anchor plate are evenly set on the inner circle of the pile end anchor plate, and a plurality of tensioning screw holes and prestressed steel bar anchor holes are evenly processed on the pile end anchor plate. After the steel bar cage is hoisted to the inner cavity of the lower mold, the pile end anchor plate is installed at the end of the steel bar cage, and one end of the prestressed steel bar is anchored in the prestressed steel bar anchor hole of the pile end anchor plate;

[0025] Installation of tensioning components: Install tensioning components at both ends of the steel cage;

[0026] Concrete distribution and tensioning: After the concrete materials are arranged, they are prestressed and tensioned. After centrifugation, curing and demoulding, the finished mixed reinforced precast piles are obtained.

[0027] In the above scheme, the steps of weaving the steel skeleton cage are: roll welding the prestressed steel bars, non-prestressed steel bars and threaded stirrups to weave a cage so that the prestressed steel bars, non-prestressed steel bars and threaded stirrups form an integral steel skeleton cage, or roll welding the prestressed steel bars and threaded stirrups to weave a cage so that the prestressed steel bars and threaded stirrups form an integral steel skeleton cage, and then tying the non-prestressed steel bars on the inner side of the steel skeleton cage.

[0028] In the above scheme, the steps of concrete distribution and tensioning are: after arranging the concrete material in the inner cavity of the lower mold of the mold, prestressing and tensioning are performed after closing the upper mold of the mold, or after closing the upper mold of the mold, the concrete material is arranged in the inner cavity of the lower mold of the mold and prestressing and tensioning is performed.

[0029] In the above scheme, in the step of installing the connecting member, when the connecting member is a non-prestressed steel bar anchor plate, a plurality of non-prestressed steel bar anchor plates are sequentially installed on the ends of the non-prestressed steel bars.

[0030] In the above scheme, in the step of installing the connecting part, when the connecting part is a connecting conversion part, the connecting rods of multiple connecting conversion parts are installed on the inner screw holes of the pile end anchor plate in sequence, the connecting tube is installed on the connecting rod, and the connecting tube is made axially movable, and multiple connecting tubes are installed on the ends of non-prestressed steel bars in sequence, and the connecting tubes are inserted into the connecting tubes in sequence.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention sets a connector at the end of the non-prestressed steel bar, and the non-prestressed steel bar is anchored to the concrete or connected to the pile end anchor plate through the connector. The connector is a non-prestressed steel bar anchor plate or a connection conversion piece. When the connector is a non-prestressed steel bar anchor plate, the anchoring force between the threaded steel bar and the concrete can be increased, the deformation of the end of the pile under horizontal bearing capacity can be reduced, the rigidity of the end can be improved, the length of the pile sleeve can be reduced, and the cost can be saved. When the connector is a connection conversion piece, the non-prestressed steel bar is connected to the pile end anchor plate through the connection conversion piece. After prestressing, the non-prestressed steel bar, the prestressed steel bar and the pile end anchor plate are connected as one, thereby enhancing the performance at the pile end. The pile end anchor plate and the non-prestressed steel bar are connected, so that the prestressed steel bar and the non-prestressed steel bar are both anchored on the pile end anchor plate, which has the characteristics of simple structure, high pull-out resistance and horizontal bearing capacity, low cost, and high construction efficiency. The pile end anchor plate is provided with a joint, through which the arc-shaped strip plate can be bent and welded to form a pile end anchor plate as a whole, which can reduce the manufacturing process and difficulty of the pile end anchor plate. The present invention realizes the mechanical connection between piles through structures such as pile end anchor plates, connecting clips, bolts, etc., and has the characteristics of simple structure, high pull-out bearing capacity, low cost, high construction efficiency, and no welding required during on-site installation. A plurality of latch teeth facing the center of the pile end anchor plate are evenly arranged on the inner circle of the pile end anchor plate. The latch teeth help the pile end anchor plate to be engaged and fixed with the corresponding latch teeth at the head and tail plates during the production process of the prefabricated pile. Based on the pile head structure of the mixed reinforced prefabricated pile of the present application, the two mixed reinforced piles can be connected to achieve the same strength as the pile body, and the construction is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the structure of a mixed reinforced prefabricated pile according to Embodiment 1 of the present invention;

[0033] Figure 2 The pile end anchor plate structure of Example 1 of the present invention is shown in FIG. Figure 1 ;

[0034] Figure 3 The pile end anchor plate structure of Example 1 of the present invention is shown in FIG. Figure 2 ;

[0035] Figure 4 The pile end anchor plate structure of Example 1 of the present invention is shown in FIG. Figure 3 ;

[0036] Figure 5 The pile end anchor plate structure of Example 1 of the present invention is shown in FIG. Figure 4 ;

[0037] Figure 6 The pile end anchor plate structure of Example 1 of the present invention is shown in FIG. Figure 5 ;

[0038] Figure 7 The pile end anchor plate structure of Example 1 of the present invention is shown in FIG. Figure 6 ;

[0039] Figure 8 is a three-dimensional schematic diagram of a prestressed steel bar structure according to Embodiment 1 of the present invention;

[0040] Fig. 9 is a schematic diagram of an enlarged structure of a spiral groove according to Embodiment 1 of the present invention;

[0041] Fig.10 The prestressed steel bar structure of Example 1 of the present invention is shown in FIG. Figure 1 ;

[0042] Fig.11 yes Fig.10 Sectional view at AA in the middle;

[0043] Fig.12 yes Fig.10 Sectional view at the middle BB;

[0044] Fig.13 A schematic diagram of a prestressed steel bar structure according to an embodiment of the present invention Figure 2 ;

[0045] Fig.14 yes Fig.13 Sectional view at AA in the middle;

[0046] Fig.15 yes Fig.13 Sectional view at the middle BB;

[0047] Fig.16 A schematic diagram of a prestressed steel bar structure according to an embodiment of the present invention Figure 3 ;

[0048] Fig.17 yes Fig.16 Sectional view at AA in the middle;

[0049] Fig.18 yes Fig.16 Sectional view at the middle BB;

[0050] Fig.19 Schematic diagram of the structure of a mixed reinforced prefabricated pile according to Embodiment 2 of the present invention;

[0051] Fig. 20 1 is a schematic diagram of the structure of the prestressed steel bar pre-tensioning connection conversion member according to Embodiment 2 of the present invention;

[0052] Fig.21 It is a schematic diagram of the structure of the connection conversion member after the stress reinforcement is tensioned in Example 2 of the present invention.

[0053] In the figure: 1. concrete pile body; 2. pile end anchor plate; 3. concrete; 4. prestressed steel bar; 5. spiral stirrup; 6. tension screw hole; 7. prestressed steel bar anchor hole; 8. non-prestressed steel bar; 9. pile sleeve; 10. steel bar body; 11. upset cap; 12. spiral groove; 13. boss; 14. annular groove; 15. upper convex part; 16. lower concave part; 17. first clamping platform; 18. convex pattern; 19. concave pattern. 20. second clamping platform; 21. non-prestressed steel bar anchor plate; 22. connection conversion piece; 23. connecting rod; 24. connecting tube; 25. connecting tube; 26. first sliding part; 27. second clamping platform; 29. ​​elastic undercut; 30. reinforcing bar groove; 31. joint; 32. clamping teeth; 33. inner screw hole. DETAILED DESCRIPTION

[0054] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Example 1

[0057] Figure 1 The figure shows an implementation mode of the hybrid reinforced precast pile of the present invention, wherein the hybrid reinforced precast pile comprises a concrete pile body 1 and a pile end anchor plate 2; the concrete pile body 1 is provided with prestressed steel bars 4, non-prestressed steel bars 8 and spiral stirrups 5; the spiral stirrups 5 are wound around the prestressed steel bars 4 and the non-prestressed steel bars 8 to form a steel skeleton cage, and the concrete 3 wraps the prestressed steel bars 4, the non-prestressed steel bars 8 and the spiral stirrups 5; the pile end anchor plate 2 is arranged at least at one end of the concrete pile body 1, and the cross-section of the pile end anchor plate 2 is hollow or solid, and the end of the prestressed steel bar 4 is connected to the pile end anchor plate 2; at least one end of the non-prestressed steel bar 8 is provided with a connecting piece; the non-prestressed steel bar 8 is anchored to the concrete 3 through the connecting piece.

[0058] Preferably, the connecting piece is a non-prestressed steel bar anchor plate 21; the non-prestressed steel bar anchor plate 21 is wrapped by concrete 3, and the non-prestressed steel bar 8 is anchored to the concrete 3 through the non-prestressed steel bar anchor plate 21. Preferably, the non-prestressed steel bar 8 is threadedly connected to the non-prestressed steel bar anchor plate 21. The end of the non-prestressed steel bar 8 is provided with an external thread, and the non-prestressed steel bar anchor plate 21 is provided with a cavity, which may or may not penetrate the non-prestressed steel bar anchor plate 21, and the cavity is provided with an internal thread, which matches the external thread of the non-prestressed steel bar 8. By arranging an anchor at the end of the non-prestressed steel bar, the anchoring force between the threaded steel bar and the concrete can be increased, the deformation of the end of the pile under horizontal bearing capacity can be reduced, the rigidity of the end is improved, the length of the pile sleeve is reduced, and the cost is saved.

[0059] The mixed reinforced prefabricated pile also includes a pile collar 9; the pile collar 9 is arranged on at least one end of the concrete pile body 1 and connected to the slot of the pile end anchor plate 2. Shear nails can be arranged inside the pile collar 3 or the inside of the pile collar 3 can be arranged in a wavy shape to improve the bonding force with the concrete.

[0060] like Figure 2-7 As shown, a plurality of tensioning screw holes 6 and prestressed steel bar anchor holes 7 are evenly arranged on the pile end anchor plate 2. The tensioning screw holes 6 and the prestressed steel bar anchor holes 7 are connected or not connected through the reinforcement groove 30. The end of the prestressed steel bar 4 passes through the tensioning screw hole 6 and is finally installed in the prestressed steel bar anchor hole 7. Figure 2 As shown, the tensioning screw holes 6 and the prestressed steel bar anchor holes 7 are arranged in pairs in a group and distributed on the annular surface of the pile end anchor plate 2, and the centers of the tensioning screw holes 6 and the prestressed steel bar anchor holes 7 are located on the same circumference.

[0061] Figure 3 As shown, two tensioning screw holes 6 and one prestressed steel bar anchor hole 7 are grouped together, and the prestressed steel bar anchor hole 7 is located between the two tensioning screw holes 6, evenly distributed on the annular surface of the pile end anchor plate 2, and the centers of the tensioning screw holes 6 and the prestressed steel bar anchor holes 7 are located on the same circumference. Figure 4 As shown, the centers of the tensioning screw holes 6 and the prestressed steel bar anchor holes 7 are not located on the same circumference, and the circle formed by connecting the centers of the tensioning screw holes 6 is located inside the circle formed by the prestressed steel bar anchor holes 7. Figure 5 The figure shows that the circular prestressed steel bar anchor holes 7 are connected to form a circle, and five tensioning screw holes 6 are evenly arranged around each prestressed steel bar anchor hole 7. Figure 6 As shown, the tensioning screw hole 6 and the prestressed steel bar anchor hole 7 are connected through a reinforcement groove 30.

[0062] like Figure 7As shown, the pile end anchor plate 2 is provided with a joint 31, and the pile end anchor plate 2 is connected to form a whole at the joint 31. The pile end anchor plate can be welded to form a pile end anchor plate as a whole by bending the arc-shaped strip plate by means of electric welding through the joint, which can reduce the manufacturing process and difficulty of the pile end anchor plate. The angle α formed by the intersection of the straight line where the center of the prestressed steel bar anchor hole 7 and the tensioning screw hole 6 is located and the center of the pile end anchor plate 2 is 8° to 15°.

[0063] The inner circle of the pile end anchor plate 2 is provided with a plurality of trapezoidal teeth 32 facing the center of the pile end anchor plate 2. Preferably, the number of the teeth 32 is 5, which are evenly distributed inside the pile end anchor plate 2, and the upper end angle δ of the teeth 32 is 90° to 140°. The trapezoidal teeth 32 are provided to facilitate the pile end anchor plate 2 to be mutually engaged and fixed with the corresponding teeth at the head and tail plates during the production of the prefabricated pile.

[0064] like Figure 8 As shown, the prestressed steel bar 4 includes a steel bar body 10 and an upset cap 11; the steel bar body 10 is provided with an upset cap 11 at at least one end, the upset cap 11 passes through the end face of the steel bar body 10, and is located in the prestressed steel bar anchor hole 7 of the pile end anchor plate 2. Preferably, the outer surface of the steel bar body 10 and the upset cap 11 is uniformly distributed with a plurality of continuous spiral grooves 12 in the circumferential direction. Preferably, the spiral angle β of the spiral groove 12 is 35° to 60°, such as Fig. 9 shown.

[0065] like Figure 10-18 As shown, a boss 13 is provided on the top of the upset cap 11, and an annular groove 14 is provided along the circumference of the outer side of the boss 13. The boss 13 is cylindrical or truncated cone-shaped. Fig.10 , 13 A nut 11 is provided at one end of the steel bar body 10, wherein: Fig.10 The boss 13 is cylindrical, Fig.11 for Fig.10 The cross-sectional view at AA in the middle. Fig.12 for Fig.10 Cross-sectional view at the middle BB. Fig.13 The boss 13 is truncated cone-shaped. Fig.14 for Fig.13 The cross-sectional view at AA in the middle. Fig.15 for Fig.13 Cross-sectional view at the middle BB. Fig.16 Both ends of the steel bar body 10 are provided with upsetting caps 11 . Fig.17 for Fig.16 The cross-sectional view at AA in FIG. 18 is Fig.16 Cross-sectional view at the middle BB.

[0066] The upsetting cap 11 is divided into an upper convex portion 15 and a lower concave portion 16 at the maximum diameter. The lower concave portion 16 is connected to the steel bar body 10. The ratio of the height of the upper convex portion 15 to the height of the lower concave portion 16 is 1 / 8 to 1 / 2.

[0067] The pile end anchor plate 2 is provided with a first clamping platform 17, which is used to dock with the clamping platform of the connection clamp. The width of the connection clamp groove is greater than the sum of the clamping platform thickness of the upper and lower prefabricated pile end anchor plates by more than 0.5 mm.

[0068] The production method of the mixed reinforced prefabricated pile comprises the following steps:

[0069] The prestressed steel bar 4 is cut to a fixed length and processed: the prestressed steel bar 4 is cut to a certain length according to the design requirements, and at least one end of the prestressed steel bar 4 is processed into a pier cap 11;

[0070] Fixed-length cutting of non-prestressed steel bars 8: After cutting the non-prestressed steel bars 8 to a certain length according to the design requirements, at least one end of the non-prestressed steel bars 8 is threaded so that it can be anchored to the concrete 3 or connected to the pile end anchor plate 2 through the connecting piece, wherein the cutting length of the non-prestressed steel bars 8 is 5 cm to 50 cm less than the cutting length of the prestressed steel bars 4;

[0071] Steel bar cage: prestressed steel bars 4, non-prestressed steel bars 8 and threaded stirrups 5 form an integral steel bar cage;

[0072] Connector installation: The connectors are installed on the ends of the non-prestressed steel bars 8 in sequence;

[0073] Mould treatment: clean the upper and lower moulds for producing mixed reinforced precast piles and apply a release agent to facilitate demoulding after the precast piles are cured;

[0074] Processing and installation of the pile end anchor plate 2: a joint 31 is provided on the pile end anchor plate 2, the pile end anchor plate 2 is connected to form a whole at the joint 31, a plurality of latching teeth 32 facing the center of the pile end anchor plate 2 are evenly provided on the inner circle of the pile end anchor plate 2, a plurality of tensioning screw holes 6 and prestressed steel bar anchor holes 7 are evenly processed on the pile end anchor plate 2, after the steel bar skeleton cage is hoisted to the inner cavity of the lower mold, the pile sleeve 3 is installed on the outer side of the pile end anchor plate 2, the pile end anchor plate 2 is installed at the end of the steel bar skeleton cage, and one end of the prestressed steel bar 4 is anchored in the prestressed steel bar anchor hole 7 of the pile end anchor plate 2;

[0075] Installation of tensioning components: Install tensioning components at both ends of the steel cage;

[0076] Concrete placement and tensioning: Prestressing is performed after the concrete material is arranged;

[0077] After centrifugation, curing and demoulding, the finished mixed reinforced prefabricated pile is obtained.

[0078] The steps of weaving the steel skeleton cage are specifically as follows: rolling welding the prestressed steel bars 4, non-prestressed steel bars 8 and threaded stirrups 5 to form a cage, so that the prestressed steel bars 4, non-prestressed steel bars 8 and threaded stirrups 5 form an integral steel skeleton cage, or rolling welding the prestressed steel bars 4 and threaded stirrups 5 to form an integral steel skeleton cage, and then tying the non-prestressed steel bars 8 to the inner side of the steel skeleton cage at one time.

[0079] The concrete distribution and tensioning steps are: after arranging the concrete material in the lower mold cavity of the mold, the upper mold of the mold is closed and prestressed tensioning is performed, or after closing the upper mold of the mold, the concrete material is arranged in the lower mold cavity of the mold and prestressed tensioning is performed.

[0080] In the step of installing the connecting member, the connecting member is a non-prestressed steel bar anchor plate 21, and multiple non-prestressed steel bar anchor plates 21 are sequentially installed at the ends of the non-prestressed steel bars 8. The maximum outer diameter of the non-prestressed steel bar anchor plate 21 is at least 1.5 times the outer diameter of the steel bar. When the non-prestressed steel bar anchor plate 21 is made of non-metallic material, the anchor plate can withstand a temperature of 200°C under a pressure of 1MPa.

[0081] The present invention realizes mechanical connection between piles through pile end anchor plates 2, connection clips, bolts and other structures, and has the characteristics of simple structure, high pull-out bearing capacity, low cost, high construction efficiency, and no welding during on-site installation.

[0082] Example 2

[0083] like Figure 19-21 As shown, the difference between the embodiment 1 and the embodiment 2 is that the connecting member of the mixed reinforced precast pile is a connecting conversion member 22; one end of the connecting conversion member 22 is connected to the non-prestressed steel bar 8, and the other end is connected to the pile end anchor plate 2. Fig. 20As shown, the connection conversion member 22 includes a connection rod 23, a connection tube 24 and a connection tube 25; one end of the connection rod 23 is threadedly connected to the pile end anchor plate 2, the other end of the connection rod 23 is axially slidably connected to one end of the connection tube 24, the other end of the connection tube 24 is connected to one end of the connection tube 25, and the other end of the connection tube 25 is threadedly connected to the end of the non-prestressed steel bar 8. A first sliding portion 26 is provided at one end of the connection tube 24, and a second clamping platform 27 is provided at the other end; a second sliding portion is provided at one end of the connection tube 25, and an elastic undercut 29 is provided at the other end, and the elastic undercut 29 can move radially after being squeezed by an external force; the first sliding portion 26 and the second sliding portion are slidably connected, and after the non-prestressed steel bar 8 is tensioned, the second clamping platform 27 can be clamped in the elastic undercut 29. The connecting rod 23 is connected to the inner screw hole 33 of the pile end anchor plate 2, and the connecting tube 25 is connected to the end of the non-prestressed steel bar 8, so as to realize the connection between the non-prestressed steel bar 8 and the pile end anchor plate 2. After the prestressed steel bar 4 is tensioned, the second clamping platform 27 of the connecting tube 24 and the elastic undercut 29 of the connecting tube 25 are clamped together, as shown in FIG. Fig.21 As shown, the steel bar cage is integrally connected to the pile end anchor plate 2.

[0084] The difference between the production method of the mixed reinforced prefabricated piles of this embodiment 2 and embodiment 1 is that in the step of installing the connecting parts, the connecting rods 23 of multiple connecting conversion parts are installed in sequence on the inner screw holes of the pile end anchor plate 2, the connecting tube 24 is installed on the connecting rod 23, and the connecting tube 24 is made axially movable, and multiple connecting tubes 25 are installed in sequence on the ends of the non-prestressed steel bars 8, and the connecting tubes 25 are inserted into the connecting tubes 24 in sequence.

[0085] The present invention connects the non-prestressed steel bar with the pile end anchor plate by setting a connection conversion piece. After the prestress is tensioned, the non-prestressed steel bar, the prestressed steel bar and the pile end anchor plate are connected as one, thereby enhancing the performance at the pile end. The pile end anchor plate and the non-prestressed steel bar are connected to realize that both the prestressed steel bar and the non-prestressed steel bar are anchored on the pile end anchor plate, which has the characteristics of simple structure, high tensile and horizontal bearing capacity, low cost, high construction efficiency, etc.

[0086] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0087] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mixed reinforced prefabricated pile, characterized in that: It comprises a concrete pile body (1) and a pile end anchor plate (2); Prestressed steel bars (4), non-prestressed steel bars (8) and spiral stirrups (5) are arranged in the concrete pile body (1); the spiral stirrups (5) are wound around the prestressed steel bars (4) and the non-prestressed steel bars (8) to form a steel skeleton cage, and the concrete (3) wraps the prestressed steel bars (4), the non-prestressed steel bars (8) and the spiral stirrups (5); the pile end anchor plate (2) is arranged at least at one end of the concrete pile body (1), and the end of the prestressed steel bar (4) is connected to the pile end anchor plate (2); at least one end of the non-prestressed steel bar (8) is provided with a connecting piece; the non-prestressed steel bar (8) is anchored to the concrete (3) or connected to the pile end anchor plate (2) through the connecting piece.

2. The hybrid reinforced prefabricated pile according to claim 1, characterized in that: The connecting piece is a non-prestressed steel bar anchor plate (21); the non-prestressed steel bar anchor plate (21) is wrapped by concrete (3), and the non-prestressed steel bars (8) are anchored to the concrete (3) through the non-prestressed steel bar anchor plate (21).

3. The hybrid reinforced prefabricated pile according to claim 1, characterized in that: The connecting piece is a connecting conversion piece (22); one end of the connecting conversion piece (22) is connected to the non-prestressed steel bar (8), and the other end is connected to the pile end anchor plate (2).

4. The hybrid reinforced prefabricated pile according to claim 3, characterized in that: The connection conversion member (22) comprises a connection rod (23), a connection tube (24) and a connection tube (25); one end of the connection rod (23) is connected to the pile end anchor plate (2), the other end of the connection rod (23) is axially slidably connected to one end of the connection tube (24), the other end of the connection tube (24) is connected to one end of the connection tube (25), and the other end of the connection tube (25) is connected to the end of the non-prestressed steel bar (8).

5. The hybrid reinforced prefabricated pile according to claim 4, characterized in that: One end of the connecting tube (24) is provided with a first sliding portion (26), and the other end is provided with a second clamping platform (27); one end of the connecting tube (25) is provided with a second sliding portion, and the other end is provided with an elastic undercut (29); the first sliding portion (26) and the second sliding portion are slidably connected, and after the non-prestressed steel bar (8) is tensioned, the second clamping platform (27) can be clamped in the elastic undercut (29).

6. The hybrid reinforced prefabricated pile according to claim 1, characterized in that: It also comprises a pile hoop (9); the pile hoop (9) is arranged on at least one end of the concrete outer surface of the concrete pile body (1) and is connected to the groove of the pile end anchor plate (2).

7. The hybrid reinforced prefabricated pile according to claim 6, characterized in that: The pile sleeve (9) is provided with shear nails inside, or the inside of the pile sleeve (9) is arranged in a wave shape.

8. The hybrid reinforced prefabricated pile according to claim 1, characterized in that: The pile end anchoring plate (2) is provided with a joint (31), and the pile end anchoring plate (2) is connected to form a whole at the joint (31).

9. The hybrid reinforced prefabricated pile according to claim 1, characterized in that: The inner circle of the pile end anchor plate (2) is evenly provided with a plurality of latching teeth (32) facing the center of the pile end anchor plate (2).

10. The hybrid reinforced prefabricated pile according to claim 1, characterized in that: The prestressed steel bar (4) comprises a steel bar body (10) and an upset cap (11); at least one end of the steel bar body (10) is provided with an upset cap (11), and the upset cap (11) passes through the end face of the steel bar body (10) and is located in the prestressed steel bar anchor hole (7) of the pile end anchor plate (2).

11. The hybrid reinforced prefabricated pile according to claim 10, characterized in that: A plurality of continuous spiral grooves (12) are evenly distributed in the circumferential direction on the outer surfaces of the steel bar body (10) and the upsetting cap (11), and the spiral angle β of the spiral grooves (12) is 35° to 60°.

12. The hybrid reinforced prefabricated pile according to claim 10, characterized in that: A boss (13) is provided on the top of the upsetting cap (11).

13. The hybrid reinforced prefabricated pile according to claim 10, characterized in that: The upsetting cap (11) is divided into an upper convex part (15) and a lower concave part (16) at the maximum diameter, the lower concave part (16) is connected to the steel bar body (10), and the ratio of the height of the upper convex part (15) to the height of the lower concave part (16) is 1 / 8 to 1 / 2.

14. The hybrid reinforced prefabricated pile according to claim 1, characterized in that: The pile end anchor plate (2) is provided with a first clamping platform (17), and the first clamping platform (17) of the pile end anchor plate (2) is used for docking with the clamping platform of the connection clamp.

15. A method for producing a mixed reinforced prefabricated pile according to any one of claims 1 to 14, characterized in that: The following steps are involved: The prestressed steel bar (4) is cut to a fixed length and processed: the prestressed steel bar (4) is cut according to the design requirements and at least one end of the prestressed steel bar (4) is processed with a cap (11); Cutting the non-prestressed steel bars (8) to a fixed length: cutting the non-prestressed steel bars (8) according to the design requirements and then threading at least one end of the non-prestressed steel bars (8); forming a steel bar cage: forming a prestressed steel bar (4), non-prestressed steel bars (8) and spiral stirrups (5) into an integral steel bar cage; Connector installation: The connectors are installed sequentially at the ends of the non-prestressed steel bars (8); Mould treatment: Apply an isolation agent to the upper and lower moulds for producing precast mixed reinforced piles; Processing and installation of the pile end anchor plate (2): a joint (31) is provided on the pile end anchor plate (2), the pile end anchor plate (2) is connected to form a whole at the joint (31), a plurality of latching teeth (32) facing the center of the pile end anchor plate (2) are evenly provided on the inner circle of the pile end anchor plate (2), a plurality of tensioning screw holes (6) and prestressed steel bar anchor holes (7) are evenly processed on the pile end anchor plate (2), the steel bar skeleton cage is hoisted to the inner cavity of the lower mold, the pile end anchor plate (2) is installed at the end of the steel bar skeleton cage, and one end of the prestressed steel bar (4) is anchored in the prestressed steel bar anchor hole (7) of the pile end anchor plate (2); Installation of tensioning components: Install tensioning components at both ends of the steel cage; Concrete distribution and tensioning: After the concrete materials are arranged, they are prestressed and tensioned. After centrifugation, curing and demoulding, the finished mixed reinforced precast piles are obtained.

16. The method for producing mixed reinforced prefabricated piles according to claim 15, characterized in that: The steps of weaving a steel frame cage are: rolling welding the prestressed steel bars (4), non-prestressed steel bars (8) and spiral stirrups (5) to form a cage, so that the prestressed steel bars (4), non-prestressed steel bars (8) and spiral stirrups (5) form an integral steel frame cage, or rolling welding the prestressed steel bars (4) and spiral stirrups (5) to form a cage, so that the prestressed steel bars (4) and spiral stirrups (5) form an integral steel frame cage, and then tying the non-prestressed steel bars (8) inside the steel frame cage.

17. The method for producing mixed reinforced prefabricated piles according to claim 15, characterized in that: The concrete distribution and tensioning steps are: after arranging the concrete material in the lower mold cavity of the mold, the upper mold of the mold is closed and prestressed tensioning is performed, or after closing the upper mold of the mold, the concrete material is arranged in the lower mold cavity of the mold and prestressed tensioning is performed.

18. The method for producing mixed reinforced prefabricated piles according to claim 15, characterized in that: In the step of installing the connecting member, when the connecting member is a non-prestressed steel bar anchor plate (21), a plurality of non-prestressed steel bar anchor plates (21) are sequentially installed on the ends of the non-prestressed steel bars (8).

19. The method for producing mixed reinforced prefabricated piles according to claim 15, characterized in that: In the step of installing the connecting member, when the connecting member is a connecting conversion member, a plurality of connecting rods (23) of the connecting conversion members are sequentially installed on the inner screw holes of the pile end anchor plate (2), a connecting tube (24) is installed on the connecting rod (23), and the connecting tube (24) is made axially movable, a plurality of connecting tubes (25) are sequentially installed on the ends of the non-prestressed steel bars (8), and the connecting tubes (25) are sequentially inserted into the connecting tubes (24).

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