Enhanced end plate and precast pile

Abstract

The present application relates to a kind of reinforced end plate, and the plate body of end plate is equipped with several anchor holes that pass through plate body, the anchor hole includes tension screw hole and steel bar anchoring hole, tension screw hole is arranged at the outside of steel bar anchoring hole, and the center line of tension screw hole coincides with the center line of steel bar anchoring hole.The present application also relates to a kind of reinforced precast pile.The end plate of the present application is by abandoning the slot or rib slot that is set on the end plate of the past, and tension screw hole and steel bar anchoring hole are arranged on the same axis, improve the contact area of steel bar upset and anchoring plate, so as to effectively improve the anchoring performance of steel bar and anchoring plate;The precast pile of the present application is by the structure such as end plate, steel bar and so on, realizes the mechanical connection of steel bar and anchoring plate, with simple structure, high pullout resistance and horizontal bearing capacity, the performance of end plate at the both ends of pile is excellent, low in cost, construction efficiency is high and so on.Characteristics, can satisfy the need of economy and safety in production process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of prefabricated component production, in particular to a reinforced end plate and a prefabricated pile. BACKGROUND

[0002] With the increasing importance of modern buildings and the increasing height of buildings, higher requirements are put forward for the bearing capacity of the foundation. The natural foundation can no longer better bear the load from the upper building, and the foundation pile is made of concrete pile. After the pile is pressed into the ground by the pile press, it becomes the foundation pile, and the upper part of the foundation pile bears the building.

[0003] In the technical solution of Chinese patent CN202023189U, the two ends of the pile are provided with metal end plates connected with the steel reinforcement cage, the metal end plates are provided with threading holes and tension holes, the threading holes are counterbores, the steel reinforcement is connected with the counterbores, and the tension holes are respectively connected with the threading holes through the reinforcement grooves. Although this end plate is convenient for the installation of the steel reinforcement and the end plate due to the provision of the reinforcement grooves, the provision of the reinforcement grooves reduces the tensile bearing capacity of the end plate, and there is a hidden danger in the stress of the steel reinforcement and the counterbores, especially in the anti-pulling engineering and the horizontal engineering. Considering the influence of the structure of the end plate on the performance of the pile body, the tensile and horizontal bearing capacity of the pile body needs to be reduced. In addition, the end plate needs to be additionally provided with the reinforcement grooves, which increases the processing cost of the end plate and the production cost of the prefabricated pile.

[0004] In the technical solution of Chinese patent CN103290839B, the end plate is provided with bolt holes, clamping arc grooves and grooves, the steel rod passes through the bolt holes and the grooves in the end plate to install the steel rod on the conical hole, so as to realize the connection between the steel rod and the end plate. In addition to the same defects as Chinese patent CN202023189U, the end plate is provided with a stepped conical hole, in order to meet the tensile and shear performance requirements of the end plate, the material quality of the end plate needs to be improved or the thickness of the end plate needs to be increased to meet the anchoring requirements of the steel rod and the end plate, so as to avoid the quality problems such as the end plate being pulled through in the tensile process of the steel rod, thereby greatly affecting the quality of the pile. Once the end plate of the prefabricated pile is pulled through in the tensile process, it will cause serious problems in the engineering. SUMMARY

[0005] In order to solve the existing technical problems, the present application provides a reinforced end plate and a prefabricated pile.

[0006] The specific content of the present application is as follows: a reinforced end plate, the plate body of the end plate is provided with a plurality of anchor tension holes penetrating the plate body, the anchor tension holes include tension screw holes and steel reinforcement anchoring holes, the tension screw holes are arranged outside the steel reinforcement anchoring holes, and the center lines of the tension screw holes coincide with the center lines of the steel reinforcement anchoring holes.

[0007] Further, the anchor hole is provided with an inclined angle near one end of the inner side of the end plate.

[0008] Further, the end plate is provided with a boss at the anchor hole, and the boss extends to the end of the end plate close to the concrete.

[0009] Further, the end plate is provided with a welding surface on the plate body, and the welding surface is arranged on the outer side of the end plate.

[0010] Further, the steel bar anchoring hole is conical.

[0011] Further, the conical angle β of the steel bar anchoring hole is 20°-180°.

[0012] Further, the ratio of the large diameter to the small diameter of the steel bar anchoring hole is 1.5-2.2.

[0013] Further, the size of the tension screw hole is larger than the size of the large opening of the steel bar anchoring hole.

[0014] Further, the steel bar anchoring hole comprises a through-bar groove 113 close to the inner side of the end plate and a clamping post 114 arranged on the outer side of the through-bar groove, and the number of the clamping posts is greater than 1.

[0015] Further, the clamping post and the through-bar groove form an angle α, and α is 30°-150°.

[0016] Further, the cross-sectional shape of the end plate comprises an outer circle and inner circle hollow shape, an outer square and inner circle hollow shape, or a polygonal solid shape, and the anchor holes are uniformly distributed in a circular or square shape on the end plate.

[0017] Further, the end plate is provided with a clamping tooth.

[0018] Further, the number of the clamping teeth is greater than 4, the clamping teeth are trapezoidal, and the upper end of the trapezoidal clamping tooth has an included angle δ of 90°-140°.

[0019] Further, the height H1 of the tension screw hole is greater than the height H2 of the steel bar anchoring hole.

[0020] Further, the inner side edge of the end plate is provided with a connecting step, and the height of the connecting step is less than the thickness of the end plate.

[0021] Further, the cross-sectional area of one surface of the end plate in contact with the concrete is greater than the cross-sectional area of the other surface of the end plate, so that the end of the end plate close to the concrete forms a clamping post.

[0022] Further, the tension screw hole and the steel bar anchoring hole are in a planar transition, an inclined surface transition, or a circular arc transition.

[0023] The application further discloses a reinforced precast pile comprising the end plate, and further comprising a pile body and a steel cage, and the end plate is arranged at two ends of the pile body respectively,

[0024] The steel cage comprises prestressed steel bars and spiral stirrups arranged outside the prestressed steel bars, the number of the prestressed steel bars is consistent with or less than the number of the steel anchoring holes, and a upsetting head is arranged at each end of the prestressed steel bar and arranged in the steel anchoring hole;

[0025] The pile body comprises concrete and a pile sleeve hoop, the concrete wraps the steel cage, and the pile sleeve hoop is arranged at the two ends of the pile body.

[0026] Further, the upsetting head has a shape comprising a taper, and the taper angle θ is 20°-180°.

[0027] Further, the upsetting head has a shape comprising a runway type, a rounded rectangular, a square rectangular and an elliptical shape, the shape of the through-stirrup groove is adapted to the shape of the upsetting head, and the size of the upsetting head is smaller than the size of the through-stirrup hole.

[0028] Further, the pile sleeve hoop extends out of the concrete at the two ends of the precast pile respectively, and a part of the pile sleeve hoop extending out of the concrete is matched with the connecting step of the end plate.

[0029] Further, the side of the pile sleeve hoop in contact with the concrete is provided with a metal indentation.

[0030] Further, the outer side of the upsetting head of the prestressed steel bar is provided with a sealing device.

[0031] Further, the sealing device comprises a non-metal material, and the sealing device can withstand a temperature of at least 60°.

[0032] Further, the outer surface of the prestressed steel bar is provided with an inner concave or outer convex thread.

[0033] The end plate of the application improves the contact area of the steel bar upsetting head and the anchoring plate by abandoning the slot or the stirrup groove arranged on the end plate of the prior art and arranging the tensioning screw hole and the steel anchoring hole on the same axis, thereby effectively improving the anchoring performance of the steel bar and the anchoring plate; the precast pile of the application realizes the mechanical connection of the steel bar and the anchoring plate through the end plate, the steel bar and other structures, has the characteristics of simple structure, high uplift and horizontal bearing capacity, excellent performance of the end plate at the two ends of the pile, low cost and high construction efficiency, and can meet the needs of economy and safety in the production process. BRIEF DESCRIPTION OF DRAWINGS

[0034] The specific embodiments of the application are further illustrated below with reference to the drawings.

[0035] Figure 1 A sectional view of the end plate of Example 1;

[0036] Figure 2front view of the end plate of example 1;

[0037] Figure 3 schematic view of the anchor hole of example 1;

[0038] Figure 4 cross-sectional view of the end plate of example 2;

[0039] Figure 5 cross-sectional view of the end plate of example 3;

[0040] Figure 6 cross-sectional view of the end plate of example 4;

[0041] Figure 7 front view of the end plate of example 5;

[0042] Figure 8 schematic view of the anchor hole of example 5;

[0043] Figure 9 front view of the end plate of example 6;

[0044] Figure 10 schematic view of the anchor hole of example 6;

[0045] Figure 11 front view of the end plate of example 7;

[0046] Figure 12 front view of the end plate of example 8;

[0047] Figure 13 cross-sectional view of the precast pile of example 9;

[0048] Figure 14 schematic view of the prestressed reinforcement of example 9;

[0049] Figure 15 schematic view of the prestressed reinforcement of example 10;

[0050] Figure 16 schematic view of the prestressed reinforcement of example 11;

[0051] Figure 17 cross-sectional view of the end plate of example 12;

[0052] Figure 18 front view of the end plate of example 12;

[0053] Figure 19 schematic view of the anchor hole of example 12 Figure 1 ;

[0054] Figure 20 schematic view of the anchor hole of example 12 Figure 2 ;

[0055] Figure 21 This is a front view of the end plate of Embodiment 13;

[0056] Figure 22 This is a schematic diagram of the anchor tension hole in Example 13;

[0057] Figure 23 This is a front view of the end plate of Example 14;

[0058] Figure 24 This is a schematic diagram of the anchor tension hole in Example 14;

[0059] Figure 25 This is a front view of the end plate of Example 15;

[0060] Figure 26 This is a front view of the end plate of Embodiment 16;

[0061] Figure 27 This is a cross-sectional view of the precast pile in Example 17;

[0062] Figure 28 This is a schematic diagram of the assembly of the end plate and prestressed steel bars in Example 17. Figure 1 ;

[0063] Figure 29 This is a schematic diagram of the assembly of the end plate and prestressed steel bars in Example 17. Figure 2 ;

[0064] Figure 30 This is a schematic diagram of the prestressed steel reinforcement in Example 17;

[0065] Figure 31 This is a schematic diagram of the metal indentation in Example 17;

[0066] Figure 32 This is a schematic diagram of the prestressed steel reinforcement in Example 18;

[0067] Figure 33 This is a schematic diagram of the prestressed steel reinforcement in Example 19;

[0068] Figure 34 Schematic diagram of the upsetting head in Example 20 Figure 1 ;

[0069] Figure 35 Schematic diagram of the upsetting head in Example 20 Figure 2 ;

[0070] Figure 36 This is a schematic diagram of the anchor tension hole in Example 20;

[0071] Figure 37 Schematic diagram of the upsetting head in Example 21 Figure 1 ;

[0072] Figure 38 Schematic diagram of the upsetting head of Example 21 Figure 2 ;

[0073] Figure 39 Schematic diagram of the anchor hole of Example 21

[0074] Figure 40 Schematic diagram of the upsetting head of Example 22 Figure 1 ;

[0075] Figure 41 Schematic diagram of the upsetting head of Example 22 Figure 2 ;

[0076] Figure 42 Schematic diagram of the anchor hole of Example 22. DETAILED DESCRIPTION

[0077] In the description of the specific embodiments, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the specific embodiments and simplifying the description, and in the absence of contrary indications, these orientation words do not indicate and imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself; "center" refers to the center position in the front view or sectional view of each component.

[0078] Example 1

[0079] As shown in Figures 1-3 , the present embodiment discloses an enhanced end plate, and the end plate 1 is overall circular, i.e., its overall front view is circular. In the present embodiment, the end plate 1 can also be overall polygonal and solid.

[0080] The plate body of the end plate 1 is provided with a welding surface 12 and 12 anchor holes 11 penetrating the plate body, the welding surface 12 is arranged on the outer side of the end plate 1 and is arc-shaped, the anchor holes 11 include tension screw holes 111 and steel bar anchoring holes 112, the tension screw holes 111 are arranged on the outer side of the steel bar anchoring holes 112, the inner wall of the tension screw holes 111 is provided with tension threads. The center line of the tension screw holes 111 coincides with the center line of the steel bar anchoring holes 112. The tension screw holes 111 and the steel bar anchoring holes 112 are in planar transition.

[0081] In the embodiment, the welding surface 12 facilitates welding of the end plate with other components, and the arc of the welding surface 12 is a circular arc with the center directed to the outside of the end plate. The inner wall of the tension screw hole 111 has a tension thread which facilitates connecting the end plate with the head and tail plates through tension bolts. By setting the tension screw hole 111 and the steel bar anchoring hole 112 as an integrated structure, compared with the prior art in which the two are connected through a groove, on the one hand, the number of holes on the end plate is reduced, thereby increasing the strength of the end plate, and on the other hand, after the steel bar head is assembled into the steel bar anchoring hole, the outer tension screw hole 111 can also play a certain limiting role, and after the end plate and the head and tail plates are assembled through the tension bolts, the tension bolts can prevent the movement of the end plate. The tension screw hole 111 and the steel bar anchoring hole 112 are in a planar transition, which reduces the manufacturing difficulty, and the tension bolt can directly contact the transition plane, thereby increasing the limiting effect, or forming a certain space between the tension bolt and the head top surface, which can be suitable for steel bar heads of different specifications.

[0082] In the embodiment, the steel bar anchoring hole 112 is conical, and the taper angle β is 20°-180°. The ratio of the diameter of the large opening to the small opening (the upper end and the lower end of the steel bar anchoring hole 112, respectively) of the steel bar anchoring hole 112 is 1.5:1. When the taper angle β of the steel bar anchoring hole 112 is 20°-180°, the corresponding taper angle of the steel bar head is 20°-180°. When the taper angle of the steel bar head is greater than 20°, the maximum stress region moves to the direction of the steel bar body during tensioning, thereby increasing the tensile performance. The conical arrangement of the steel bar anchoring hole 112 can also increase the contact area between the steel bar head and the end plate, thereby enhancing the anchoring performance.

[0083] The size of the tension screw hole 111 is greater than the size of the large opening of the steel bar anchoring hole 112. The height H1 of the tension screw hole 111 is greater than the height H2 of the steel bar anchoring hole 112. By such arrangement, the head 21 of the steel bar is placed in the steel bar anchoring hole 112 when the steel bar is assembled, without affecting the installation of the tension bolt.

[0084] In the embodiment, a recessed connecting step 13 is arranged on one side edge of the end plate 1, which facilitates the cooperation of the end plate 1 with the pile sleeve at both ends of the precast pile during assembly of the precast pile. The connecting step 13 is formed by the cross-sectional area of the end plate 1 on the side close to the concrete being smaller than the cross-sectional area on the other side, and when cooperating with the pile sleeve, the end of the pile sleeve is located in the recessed position.

[0085] The end plate 1 of the embodiment, by abandoning the setting of the slot or the rib groove on the previous end plate, setting the tension screw hole 111 and the steel bar anchoring hole 112 on the same axis, improves the contact area of the steel bar upset with the end plate, thereby effectively improving the anchoring performance of the steel bar and the anchoring plate; the taper angle β of the steel bar anchoring hole 112 is set to 20°-180°, when the included angle is greater than 20°, the performance of the steel bar anchoring hole 112 is optimal, effectively reducing the stress concentration phenomenon between the end plate 1 and the prestressed steel bar in the tensioning process, effectively avoiding the deformation of the end plate 1, and improving the tensile performance of the end plate 1.

[0086] Embodiment 2

[0087] As shown in Figure 4 , the embodiment discloses an enhanced end plate, wherein the steel bar anchoring hole 112 is provided with an inclined angle 15 near one end of the inner side of the end plate (i.e. the small mouth bottom of the steel bar anchoring hole 112); the cross-sectional area of the surface of the end plate in contact with the concrete is greater than the cross-sectional area of the other surface of the end plate, so that the end part of the end plate close to the concrete forms a clamping table 14. The remaining technical features are the same as those of embodiment 1 and will not be repeated here.

[0088] The inclined angle of the embodiment refers to an inclined angle in a sectional view, and in the actual structure, the place is a channel in the shape of a horn with a small upper part and a large lower part. The inclined angle 15 is provided at the small mouth of the steel bar anchoring hole 112, which can play a guiding role when the steel bar is inserted, thereby facilitating the insertion of the steel bar. The clamping table 14 of the embodiment presents a stepped shape with a high step near the inner side of the end plate and a low step near the outer side of the end plate. The pile sleeve hoop corresponding to the clamping table 14 is provided with a bending part at the end, in the shape of “L”. In this way, during the production of the precast pile, the end plate can be assembled first, and then the pile sleeve hoop can be assembled, and only the bending part at the end of the pile sleeve hoop needs to be pressed into the clamping table. Through the arrangement of this structure, the pile sleeve hoop can be conveniently assembled on the end plate, and the stability of the connection between the two is improved.

[0089] Embodiment 3

[0090] As shown in Figure 5 , the embodiment discloses an enhanced end plate, wherein the end plate 1 is provided with a boss 16 at the anchoring hole 11, and the boss 16 extends towards the end of the end plate 1 close to the concrete. The remaining technical features are the same as those of embodiment 1 and will not be repeated here.

[0091] Specifically, the boss 16 is located on the inner side of the end plate, with its centerline coinciding with the centerline of the anchor hole 11, and the boss 16 partially surrounds the rebar anchor hole 112. The height of the rebar anchor hole 112 is greater than the thickness of the boss 16, and the lateral dimension of the boss 16 is greater than the lateral dimension of the tension bolt hole 111. The shape of the boss 16 is not limited to cylindrical or cuboid dimensions; in this embodiment, the boss 16 is cylindrical. By providing a boss on the side of the end plate 1 closest to the concrete, the contact area between the end plate 1 and the concrete can be increased, thereby improving the stability of the precast pile. On the other hand, the small opening of the rebar anchor hole 112 is located at the lower edge of the boss, which can play a guiding role when the rebar is threaded through. At the same time, the height of the rebar anchor hole 112 is greater than the thickness of the boss 16, saving manufacturing costs.

[0092] Example 4

[0093] like Figure 6 As shown, this embodiment discloses an enhanced end plate, wherein the cross-sectional area of ​​the side of the end plate in contact with the concrete is larger than the cross-sectional area of ​​the other side of the end plate, so that the end of the end plate near the concrete forms a retaining platform 14; a boss 16 is provided at the anchor tension hole 11 of the end plate 1, and the boss 16 extends towards the end of the end plate 1 near the concrete. The remaining technical features are the same as those in Embodiment 1, and will not be repeated here.

[0094] The mounting bracket 14 in this embodiment has a stepped shape, with a higher step near the inner side of the end plate and a lower step near the outer side. The pile sleeve corresponding to the mounting bracket 14 has a bent portion at its end, forming an "L" shape. This allows for easy assembly of the pile sleeve onto the end plate during precast pile production, as the end plate can be installed first, followed by the pile sleeve. The bent portion at the end of the pile sleeve is simply pressed into the mounting bracket. This structure facilitates easy assembly of the pile sleeve onto the end plate and improves the stability of the connection. The boss 16 is located inside the end plate, with its centerline coinciding with the centerline of the anchor hole 11, and partially surrounds the rebar anchor hole 112. The height of the rebar anchor hole 112 is greater than the thickness of the boss 16, and the lateral dimension of the boss 16 is greater than the lateral dimension of the tension bolt hole 111. The shape of the boss 16 is not limited to a cylinder or cuboid; in this embodiment, the boss 16 is cylindrical. By setting a boss on the side of the end plate 1 near the concrete, the contact area between the end plate 1 and the concrete can be increased, thereby improving the stability of the precast pile. On the other hand, the small opening of the rebar anchor hole 112 is set at the lower edge of the boss, which can play a guiding role when the rebar is threaded through. At the same time, the height of the rebar anchor hole 112 is greater than the thickness of the boss 16, saving manufacturing costs.

[0095] Example 5

[0096] like Figure 7 and Figure 8As shown, this embodiment discloses an enhanced end plate, wherein the tension screw hole 111 and the rebar anchoring hole 112 form a beveled transition, that is, the connecting section between the tension screw hole 111 and the rebar anchoring hole 112 is beveled. Five trapezoidal locking teeth 14 facing the center are provided on the inner side of the end plate 1, with the included angle δ at the upper end of the trapezoids being 90° to 140°. The ratio of the diameter of the large opening to the small opening (referring to the upper and lower ends of the rebar anchoring hole 112, respectively) of the rebar anchoring hole 112 is 2:1. The beveled transition between the tension screw hole 111 and the rebar anchoring hole 112 facilitates manufacturing; when the rebar upsetting head is conical, the space formed by this bevel can accommodate rebar upsetting heads of different specifications. The locking teeth 14 allow the end plates to engage and be fixed with the corresponding locking structures on the head and tail plates during the precast pile production process. The locking teeth are trapezoidal, with the actual shape being that the lower base coincides with the inner arc (the actual lower base is an arc), the upper base is shorter than the lower base, and the two sides are equal. Therefore, the included angle δ at the upper end of the trapezoidal locking teeth 14 is set to 90° to 140°. Within this range, the strength of the trapezoidal locking teeth increases, while the upper base is shorter. This shape facilitates engagement with other locking structures. The remaining technical features are the same as in Embodiment 1 and will not be repeated here.

[0097] Example 6

[0098] like Figure 9 and Figure 10 As shown, this embodiment discloses an enhanced end plate, wherein the end plate 1 is square on the outside and circular on the inside. In the front view, the four outermost corners of the end plate are rounded. A total of 10 anchor holes 11 are provided, evenly distributed on an arc with the center of the end plate 1 as the center and the distance from the center of the end plate 1 to the center of any anchor hole 11 as the radius. The tension screw hole 111 and the rebar anchor hole 112 have a rounded transition, that is, the connecting section between the tension screw hole 111 and the rebar anchor hole 112 is an arc. The ratio of the diameter of the larger opening to the smaller opening (referring to the upper and lower ends of the rebar anchor hole 112, respectively) of the rebar anchor hole 112 is 2.2:1. The tensioning screw hole 111 and the rebar anchoring hole 112 are connected by an arc. This arc structure is easy to manufacture (e.g., when using a drill bit to construct the end plate, it is easy to form an arc-shaped structure). When the rebar upsetting head is conical, the space formed by this arc surface can accommodate rebar upsetting heads of different specifications.

[0099] The remaining technical features are the same as any of Examples 1-5, and will not be repeated here.

[0100] Example 7

[0101] like Figure 11As shown, this embodiment discloses an enhanced end plate, wherein the end plate 1 is square on the outside and circular on the inside, and has a total of 8 anchor tensioning holes 11, which are evenly distributed in a rectangle on the end plate 1. Specifically, the center of the rectangle formed by the 8 anchor tensioning holes coincides with the center of the end plate, and the distance from the anchor tensioning hole to the nearest edge of the end plate is the same. An anchor tensioning hole is provided at the vertex and center of each side of the rectangle. When the precast pile to be manufactured is square, the shape of the end plate of this embodiment can be adapted to it. Correspondingly, the shape of the upset head of the matching steel cage is also rectangular, and the position of the upset head corresponds to the position of the anchor tensioning hole.

[0102] The remaining technical features are the same as any of Examples 1-6, and will not be repeated here.

[0103] Example 8

[0104] like Figure 12 As shown, this embodiment discloses an enhanced end plate, wherein the end plate 1 is square on the outside and circular on the inside, with a total of 8 anchor tension holes 11 evenly distributed in a rectangle on the end plate 1. The inner side of the end plate 1 is provided with 5 trapezoidal locking teeth 14 facing the center, and the included angle δ of the upper end of the trapezoid is 90° to 140°. The locking teeth 14 enable the end plate to be locked and fixed with the corresponding locking structure on the head and tail plates during the precast pile production process; the locking teeth are set as trapezoids, and the actual shape is that the lower base coincides with the inner arc (the actual lower base is an arc), the upper base length is less than the lower base, and the two sides are equal; therefore, the included angle δ of the upper end of the trapezoidal locking teeth 14 is set to 90° to 140°. Within this range, the strength of the trapezoidal locking teeth is increased, and the upper base is shorter. This shape can be easily locked with other locking structures.

[0105] The remaining technical features are the same as any of Examples 1-7, and will not be repeated here.

[0106] Example 9

[0107] like Figures 13-14 , Figure 31 As shown, this embodiment discloses an enhanced precast pile, including any one of the end plates in embodiments 1-8, as well as a pile body and a reinforcing cage, with the end plates respectively disposed at both ends of the pile body.

[0108] The reinforcing cage includes prestressed steel bars 2 and spiral stirrups 3 set on the outside of the prestressed steel bars 2. The number of prestressed steel bars 2 is the same as or less than the number of steel bar anchor holes 112. Upsetting heads 21 are provided at both ends of the prestressed steel bars 2 and are set in the steel bar anchor holes 112.

[0109] The pile body includes concrete 4 and pile sleeves 5. The concrete 4 encloses the reinforcing cage, and the pile sleeves 5 are located at both ends of the pile body. The pile sleeves 5 extend out of the concrete 4 at both ends of the precast pile, and a portion of the extended concrete 4 engages with the connecting step 13 of the end plate 1. A metal indentation 51 is provided on the side of the pile sleeve 5 that contacts the concrete 4.

[0110] By engaging the pile sleeve 5 with the connecting step 13 of the end plate 1, a tight connection can be established between the two; by setting the metal indentation 51, the bonding performance between the pile sleeve 5 and the pile concrete 4 is effectively improved. In this embodiment, the metal indentation 51 is hexagonal in shape, but other shapes can be used in actual production.

[0111] In this embodiment, the steel bar upheads 21 at both ends of the steel cage are fixed in the steel bar anchoring holes 112 of the end plates 1 at both ends. Then, the head plate or tail plate is connected to the outside of the end plate through the tension screw holes 111. The pile sleeve 5 is connected to the inside of the end plate. After tensioning, concrete is poured in and then cooled to obtain the finished precast pile.

[0112] In this embodiment, the upset head 21 has a conical shape with a cone angle θ ranging from 20° to 180°. The diameters of the largest and smallest ends of the upset head 21 are smaller than the large and small diameters of the anchor hole 112, respectively; the height H2 of the end plate anchor hole 112 is greater than the height h of the upset head 21. The cone angle of the conical upset head 21 used for the prestressed steel bars 2 in the precast pile is set above 20°, resulting in optimal performance at the upset head 21 and improved stress performance of the steel bar. The dimensions of the upset head 21 are smaller than the anchor hole 112, and the height h is smaller than the thickness H2 of the anchor hole 112, preventing the upset head 21 from protruding from the anchor hole 112 and affecting the installation of the tension bolts.

[0113] The precast piles in this embodiment achieve mechanical connection between the reinforcing bars and the anchor plates through end plates 1, reinforcing bars, and other structures. They have the characteristics of simple structure, high tensile and horizontal bearing capacity, excellent performance of end plates at both ends of the pile, low cost, and high construction efficiency, and can meet the needs of economy and safety in the production process.

[0114] Example 10

[0115] like Figure 15 As shown in the figure, this embodiment discloses an enhanced precast pile, wherein the outer surface of the prestressed steel bar 2 is provided with concave or convex threads 22, which can increase the contact area between the prestressed steel bar 2 and the concrete 4, thereby improving the strength of the precast pile.

[0116] The remaining technical features are the same as those in Example 9, and will not be repeated here.

[0117] Example 11

[0118] like Figure 16As shown, the embodiment discloses an enhanced precast pile, wherein the outside of the upset head 21 of the prestressed steel bar 2 is provided with a sealing device 23, the sealing device 23 comprises a non-metallic material, and the sealing device 23 can withstand a temperature of at least 60°. By blocking the contact between the upset head 21 and the external environment through the sealing device 23, the aging or corrosion of the steel bar is prevented or slowed down, thereby improving the service life and safety of the precast pile.

[0119] The remaining technical features are the same as those of Embodiment 9 or 10, and are not described here again.

[0120] Embodiment 12

[0121] As Figures 17-20 shown, the embodiment discloses an enhanced end plate, and the end plate 1 is in the shape of an outer circle and an inner circle, that is, the overall front view of the end plate 1 is in the shape of a circular ring.

[0122] The plate body of the end plate 1 is provided with a welding surface 12 and 12 anchor holes 11 penetrating the plate body, the welding surface 12 is arranged on the outer side of the end plate 1 and is in the shape of an arc, the anchor holes 11 include tension screw holes 111 and steel bar anchoring holes 112, the tension screw holes 111 are arranged on the outer side of the steel bar anchoring holes 112, the inner wall of the tension screw holes 111 is provided with tension threads 22, the center line of the tension screw holes 111 coincides with the center line of the steel bar anchoring holes 112, and the tension screw holes 111 and the steel bar anchoring holes 112 are in a planar transition.

[0123] In the embodiment, the welding surface facilitates the welding of the end plate with other components, and the arc shape of the welding surface is a circular arc with the center pointing to the outer side of the end plate; the tension threads on the inner wall of the tension screw holes 111 facilitate the connection of the end plate with the head and tail plates through tension bolts. By arranging the tension screw holes 111 and the steel bar anchoring holes 112 in an integrated structure, compared with the connection between the two through a groove in the prior art, on the one hand, the number of holes on the end plate is reduced, thereby increasing the strength of the end plate, and on the other hand, after the steel bar upset head is assembled into the steel bar anchoring hole, the outer tension screw hole 111 can also play a certain limiting role, and after the end plate and the head and tail plates are assembled through the tension bolts, the tension bolts can also prevent the movement thereof. The planar transition of the tension screw holes 111 and the steel bar anchoring holes 112 reduces the manufacturing difficulty, and the tension bolts can directly contact the transition plane, thereby increasing the limiting effect, or forming a certain space between the tension bolts and the top surface of the upset head, which can be suitable for steel bar upset heads of different specifications.

[0124] In the embodiment, the steel bar anchoring hole 112 comprises a through bar groove 113 close to the inner side of the end plate 1 and a clamping post 114 arranged outside the through bar groove 113, the number of the clamping post 114 is two and symmetrically distributed in the steel bar anchoring hole 112. The two clamping posts 114 and the middle part of the through bar groove 113 form a space for accommodating and positioning the steel bar head. The maximum dimension line (referring to the maximum dimension in the horizontal direction or the vertical direction) of the clamping post 114 and the through bar groove 113 forms an angle α, and α is 30°-150°. In the embodiment, the through bar groove 113 is a racetrack type, that is, it comprises two parallel straight lines and two circular arcs at the ends, and α is 90°. The angle α is between 30° and 150°, so as to ensure that the two steel bar anchoring hole 112 and the hole 15 and the counterbore groove 14 are not too close to each other, on the one hand, to prevent the problem that the part volume between the stepped counterbore and the steel bar anchoring hole is too small to effectively limit the head due to the too close distance between the two, and on the other hand, to facilitate production and prevent construction difficulties due to the too close distance between the two during the production process. The size of the tensioning screw hole 111 is larger than the size of the large opening of the steel bar anchoring hole 112. The height H1 of the tensioning screw hole 111 is greater than the height H2 of the steel bar anchoring hole 112. The size of the tensioning screw hole 111 is larger than the size of the steel bar anchoring hole 112, so that after the steel bar passes through the steel bar anchoring hole, the head can be rotated in the tensioning screw hole 111 or after extending out of the tensioning screw hole 111, so as to realize the rotation positioning of the head in the end plate.

[0125] In the embodiment, a recessed connecting step 13 is arranged at one side edge of the end plate 1, so as to facilitate the cooperation between the end plate 1 and the pile sleeve 55 at both ends of the precast pile during the assembly of the precast pile.

[0126] In the embodiment, when the end plate 1 is assembled with the steel bar, the head 21 is passed through the through bar groove 113 and rotated by an angle α, and then the head 21 is pulled back in the direction opposite to the direction of passing through the bar, so that the head 21 is clamped on the clamping post 114. When the tensioning device drives the end plate 1 to stretch the main steel bar, the clamping post 114 of the steel bar anchoring hole 112 will pull and stretch the main steel bar. In this way, the heads 21 at both ends of all the main steel bars are processed, and then the end plate 1 is assembled and clamped, without the need to pass through the end plate 1 and then process the head 21 as in the traditional technology, so as to realize the sequential flow of the whole process, facilitate the process layout, and improve the production efficiency.

[0127] The end plate 1 of the embodiment further improves the anchoring performance of the steel bar and the anchoring plate by abandoning the setting of the slot or the rib groove on the previous end plate, setting the tension screw hole 111 and the steel bar anchoring hole 112 on the same axis, and improving the contact area of the steel bar head 21 and the anchoring plate.

[0128] Embodiment 13

[0129] As shown in Figure 21 and Figure 22 , the embodiment discloses a reinforced end plate, wherein the tension screw hole 111 and the steel bar anchoring hole 112 are inclined, that is, the connecting section between the tension screw hole 111 and the steel bar anchoring hole 112 is inclined. Five trapezoidal clamping teeth 14 are arranged on the inner side of the end plate 1 and face the center, and the upper end of the trapezoid has an included angle δ of 90°-140°. The ratio of the large opening to the small opening (the upper end and the lower end of the steel bar anchoring hole 112, respectively) of the steel bar anchoring hole 112 is 2:1. The tension screw hole 111 and the steel bar anchoring hole 112 are inclined, and the inclined structure is convenient to manufacture. The clamping teeth 14 enable the end plate to be clamped and fixed with the corresponding clamping structure on the head and tail plate during the production of the prefabricated pile. The clamping teeth are trapezoidal in shape, and the actual shape is that the lower base coincides with the inner side arc (the actual lower base is an arc), the upper base length is less than the lower base, and the two waists are equal. Therefore, the upper end of the trapezoidal clamping teeth 14 has an included angle δ of 90°-140°, within this range, the strength of the trapezoidal clamping teeth increases, and at the same time, the upper base is shorter. This shape can facilitate clamping with other clamping structures.

[0130] The remaining technical features are the same as those of Embodiment 12, and will not be described here.

[0131] Embodiment 14

[0132] As shown in Figure 23 and Figure 24As shown, this embodiment discloses an enhanced end plate, wherein the end plate 1 is square on the outside and circular on the inside, with a total of 8 anchor holes 11. The 8 anchor holes 11 are evenly distributed on an arc with the center of the end plate 1 as the center and the distance from the center of the end plate 1 to the center of any anchor hole 11 as the radius. The tension screw hole 111 and the rebar anchor hole 112 have an arc transition, that is, the connection section between the tension screw hole 111 and the rebar anchor hole 112 is an arc. The ratio of the diameter of the large opening to the small opening (referring to the upper end and the lower end of the rebar anchor hole 112, respectively) of the rebar anchor hole 112 is 2.2:1. The arc transition between the tension screw hole 111 and the rebar anchor hole 112 is convenient to manufacture (when using a drill bit to construct the end plate, it is easy to form an arc-shaped structure). By setting the ratio of the large opening to the small opening of the rebar anchoring hole 112, the contact area between the rebar anchoring hole 112 and the corresponding upset head is increased, thereby improving the anchoring performance of the end plate.

[0133] The remaining technical features are the same as those in Embodiments 12 or 13, and will not be repeated here.

[0134] Example 15

[0135] like Figure 25 As shown, this embodiment discloses an enhanced end plate, wherein the end plate 1 is square on the outside and circular on the inside, and has a total of 8 anchor tension holes 11, which are evenly distributed in a rectangle on the end plate 1. Specifically, the center of the rectangle formed by the 8 anchor tension holes 11 coincides with the center of the end plate, and the distance from the anchor tension hole 11 to the nearest edge of the end plate is the same. An anchor tension hole 11 is provided at the vertex and center of each side of the rectangle. When the precast pile to be manufactured is square, the shape of the end plate of this embodiment can be adapted to it. Correspondingly, the shape of the upset head of the matching steel cage is also rectangular, and the position of the upset head corresponds to the position of the anchor tension hole 11.

[0136] The remaining technical features are the same as any of Examples 12-14, and will not be repeated here.

[0137] Example 16

[0138] like Figure 26 As shown, this embodiment discloses an enhanced end plate, wherein the end plate 1 is square on the outside and circular on the inside, with a total of 8 anchor tension holes 11 evenly distributed in a rectangle on the end plate 1. The inner side of the end plate 1 is provided with 5 trapezoidal locking teeth 14 facing the center, and the included angle δ of the upper end of the trapezoid is 90° to 140°. The locking teeth 14 enable the end plate to be locked and fixed with the corresponding locking structure on the head and tail plates during the precast pile production process; the locking teeth are set as trapezoids, and the actual shape is that the lower base coincides with the inner arc (the actual lower base is an arc), the upper base length is less than the lower base, and the two sides are equal; therefore, the included angle δ of the upper end of the trapezoidal locking teeth 14 is set to 90° to 140°. Within this range, the strength of the trapezoidal locking teeth is increased, and the upper base is shorter. This shape can be easily locked with other locking structures.

[0139] The rest of the technical features are the same as any one of embodiments 1-7, which will not be repeated here.

[0140] Embodiment 17

[0141] As shown in Figures 27-31 Embodiment 17 discloses an enhanced precast pile, including any one of the end plates 1 in embodiments 12-16, and further including a pile body and a reinforcement cage, the end plates are respectively arranged at both ends of the pile body,

[0142] The reinforcement cage includes prestressed steel bars 2 and spiral stirrups 3 arranged outside the prestressed steel bars 2, the number of the prestressed steel bars 2 is consistent with or less than the number of the steel anchoring holes 112, a upset head 21 is arranged at both ends of the prestressed steel bars 2, the upset head 21 is arranged in the steel anchoring hole 112, and the thickness H2 of the steel anchoring hole 112 is greater than the height h of the steel upset head 21;

[0143] The pile body includes concrete 4 and pile collars 5, the concrete 4 wraps the reinforcement cage, and the pile collars 5 are arranged at both ends of the pile body. The pile collars 5 respectively extend out of the concrete 4 at both ends of the precast pile, and a part extending out of the concrete 4 is matched with the connecting step 13 of the end plate 1. A metal indentation 51 is arranged on the side of the pile collar 5 in contact with the concrete 4.

[0144] Through matching the connecting step 13 of the pile collar 5 with the end plate 1, the two can be closely connected; through arranging the metal indentation 51, the bonding performance of the pile collar 5 and the concrete 4 of the pile body is effectively improved. In the embodiment, the metal indentation 51 is hexagonal in shape, and other shapes can be used in actual production.

[0145] In the embodiment, the upset head 21 is in the shape of a racetrack, specifically, including two parallel straight edges and two opposite circular arcs in the front view. And the end connected with the steel bar body of the upset head 21 is flat. Correspondingly, the tensioning screw hole 111 and the steel anchoring hole 112 of the end plate 1 are connected in a plane. The racetrack structure of the embodiment has the advantages that on the one hand, the circular arc parts at both ends are convenient to manufacture and reduce the processing cost, and the safety of the corresponding steel upset head shape is relatively high, and on the other hand, the straight line structure in the middle is larger than both sides, which can play a good limiting and guiding role when assembling, so it is more convenient to assemble with the corresponding steel upset head and has good stability. The tensioning screw hole 111 and the steel anchoring hole 112 are connected in a plane, which reduces the manufacturing difficulty, and the tensioning bolt can directly contact the transition plane, thereby increasing the limiting effect, or forming a certain space between the tensioning bolt and the top surface of the upset head, which can be suitable for steel upset heads of different specifications.

[0146] Preferably, the prestressed steel bar 2 is provided with a concave or convex thread 22 on the outer surface, and a sealing device 23 is provided on the outer side of the upsetting head 21. The thread 22 can increase the contact area between the prestressed steel bar 2 and the concrete 4, thereby improving the strength of the precast pile. The sealing device 23 comprises a non-metallic material, and the sealing device 23 can withstand a temperature of at least 60°. The upsetting head 21 is prevented from contacting the external environment by the sealing device 23, thereby preventing or slowing down the aging or rusting of the steel bar, and improving the service life and safety of the precast pile.

[0147] In the production of the precast pile, the two ends of the prestressed steel bar 2 can be provided with the upsetting head 21, and then the steel bar cage is made with the spiral stirrup 3. Then the upsetting head 21 at one end of the steel bar cage is passed through the through-hole 113 on the end plate 1 and rotated by an angle α, and then the upsetting head 21 is pulled back in the direction opposite to the direction of passing through the hole, so that the upsetting head 21 is clamped on the clamping table 114. When the end plate 1 is stretched by the tensioning device, the clamping table 114 of the steel bar anchoring hole 112 will pull the main steel bar to stretch the main steel bar. Then other components are assembled, so that the process of assembling after the upsetting head 21 is realized, and the production efficiency is improved.

[0148] The precast pile of the embodiment realizes the mechanical connection between the steel bar and the anchoring plate through the end plate 1 and the steel bar, has the characteristics of simple structure, high uplift and horizontal bearing capacity, excellent performance of the end plate at both ends of the pile, low cost, high construction efficiency, and can meet the needs of economy and safety in the production process.

[0149] Embodiment 18

[0150] As shown in the drawings, Figure 32 The embodiment discloses a reinforced precast pile, wherein the upsetting head 21 is in the shape of a racetrack, specifically, includes two parallel straight edges and two opposite circular arcs in the front view. The end of the upsetting head 21 connected with the steel bar body is beveled. Correspondingly, the tensioning screw hole 111 and the steel bar anchoring hole 112 of the end plate 1 are connected in a beveled manner. The tensioning screw hole 111 and the steel bar anchoring hole 112 are connected in a beveled manner, and the beveled structure is convenient to manufacture.

[0151] The remaining technical features are the same as those of embodiment 17, and will not be described here.

[0152] Embodiment 19

[0153] As shown in the drawings, Figure 33As shown, this embodiment discloses an enhanced precast pile, wherein the upset head 21 is racetrack-shaped, specifically, it includes two parallel straight edges and two opposing arcs in the front view. The end of the upset head 21 that connects to the reinforcing bar is also arc-shaped. Correspondingly, the tension bolt hole 111 and the reinforcing bar anchor hole 112 of the end plate 1 are connected by an arc. The tension bolt hole 111 and the reinforcing bar anchor hole 112 form an arc transition, and this arc structure is easy to manufacture (e.g., when using a drill bit to construct the end plate, it is easy to form an arc-shaped structure).

[0154] The remaining technical features are the same as those in Example 17, and will not be repeated here.

[0155] Example 20

[0156] like Figures 34-36 As shown, this embodiment discloses an enhanced precast pile, wherein the upset head 21 is a rounded rectangle. Specifically, the upset head 21 is rectangular in the front view direction, with rounded corners at all four corners. The shapes formed by the reinforcing bar groove 113 and the retaining platform 114 also correspond accordingly. The rounded rectangle structure of this embodiment is convenient to manufacture, and the rounded corners of the structure correspond to the high safety of the reinforcing bars with this upset head shape, making them easy to handle. On the other hand, this shape can effectively restrain the upset head placed within it, giving the assembled reinforcing bars good stability and anchorage performance.

[0157] The remaining technical features are the same as those in Example 17, and will not be repeated here.

[0158] Example 21

[0159] like Figures 37-39 As shown, this embodiment discloses an enhanced precast pile, wherein the upset head 21 is a chamfered rectangle. Specifically, the upset head 21 is rectangular in shape in the front view, with the four corners of the rectangle being beveled. The shapes formed by the reinforcing bar groove 113 and the clamping platform 114 also correspond to this. The chamfered rectangle structure of this embodiment is stable and easy to manufacture, and the corresponding reinforcing bar upset head shape can also be easily manufactured by an upsetting machine. On the other hand, the beveled corners can effectively restrict the reinforcing bar upset head placed therein, giving the assembled reinforcing bar good stability and anchorage performance.

[0160] The remaining technical features are the same as those in Example 17, and will not be repeated here.

[0161] Example 22

[0162] like Figures 40-42As shown, the embodiment discloses an enhanced precast pile, wherein the upsetting head 21 is in an oval shape, specifically, the upsetting head 21 is in an oval shape in the front view direction and is in a rectangular shape in the side view direction. The shape formed by the through rib groove 113 and the clamping post 114 also corresponds to the same. The oval structure of the embodiment is easy to manufacture and reduces the manufacturing process, whether it is the through rib groove 113, the clamping post 114 or the reinforcing steel bar upsetting head to be assembled. On the other hand, the oval structure is in a "flat round shape" as a whole, and the size of both ends is smaller than the middle, which can effectively limit the corresponding reinforcing steel bar upsetting head placed therein, so that the assembled reinforcing steel bar has good stability and anchoring performance.

[0163] The remaining technical features are the same as those of embodiment 17, and will not be described here.

[0164] In the above description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the above description is only preferred embodiments of the present application, and the present application can be implemented in many different ways from those described herein, so the present application is not limited to the specific implementations disclosed above. Meanwhile, any person skilled in the art can make many possible changes and modifications to the technical solutions of the present application or modify them into equivalent embodiments with the above disclosed methods and technical contents without departing from the scope of the technical solutions of the present application. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the scope of the technical solutions of the present application shall still fall within the scope of protection of the technical solutions of the present application.

Claims

1. An enhanced end plate characterized by: The plate body of the end plate is provided with a plurality of anchor holes penetrating the plate body, the anchor holes include tensioning screw holes and steel bar anchoring holes, the tensioning screw holes are arranged outside the steel bar anchoring holes, the center line of the tensioning screw hole coincides with the center line of the steel bar anchoring hole, the size of the tensioning screw hole is larger than the size of the large opening of the steel bar anchoring hole, the steel bar anchoring hole includes a through bar groove and a clamping post, the through bar groove is close to the inner side of the end plate, the clamping post is arranged outside the through bar groove, the number of the clamping post is greater than 1, the clamping post and the maximum size of the through bar groove form an angle α, and α is 30°-150°.

2. The reinforced end plate of claim 1, wherein: An inclined angle is arranged at one end of the anchor hole close to the inner side of the end plate.

3. The reinforced end plate of claim 1, wherein: A boss is arranged at the anchor hole of the end plate, and the boss extends to the end of the end plate close to the concrete.

4. The reinforced end plate of claim 1, wherein: The steel bar anchoring hole is conical.

5. The reinforced end plate of claim 4, wherein: The conical angle β of the steel bar anchoring hole is 20°-180°.

6. The reinforced end plate of claim 4, wherein: The ratio of the diameter of the large opening to the small opening of the steel bar anchoring hole is 1.5-2.

2.

7. The reinforced end plate of claim 1, wherein: The cross-sectional shape of the end plate includes a hollow shape with an outer circle and an inner circle, a hollow shape with an outer square and an inner circle, or a polygonal solid shape, and the anchor holes are uniformly distributed in a circular or square shape on the end plate.

8. The reinforced end plate of claim 1, wherein: The end plate is provided with clamping teeth.

9. The reinforced end plate of claim 8, wherein: The number of the clamping teeth is greater than 4, and the clamping teeth are trapezoidal, and the upper end of the trapezoidal clamping teeth has an included angle δ of 90°-140°.

10. The reinforced end plate of claim 1, wherein: The height H1 of the tensioning screw hole is greater than the height H2 of the steel bar anchoring hole.

11. The reinforced end plate of claim 1, wherein: The inner side edge of the end plate is provided with a connecting step, and the height of the connecting step is less than the thickness of the end plate.

12. The reinforced end plate of claim 1, wherein: The cross-sectional area of the surface of the end plate in contact with the concrete is greater than the cross-sectional area of the other surface of the end plate, so that the end of the end plate close to the concrete forms a clamping post.

13. The reinforced end plate of claim 1, wherein: The tensioning screw hole and the steel bar anchoring hole are in a planar transition, an inclined surface transition, or a circular arc transition.

14. An enhanced precast pile characterized by: The enhanced end plate comprises a pile body and a steel bar cage, and the end plate is arranged at both ends of the pile body, The steel bar cage comprises prestressed steel bars and spiral stirrups arranged outside the prestressed steel bars, the number of the prestressed steel bars is consistent with or less than the number of the steel bar anchoring holes, and a upsetting head is arranged at both ends of the prestressed steel bar and arranged in the steel bar anchoring hole; The pile body comprises concrete and a pile sleeve, the concrete wraps the steel bar cage, and the pile sleeve is arranged at both ends of the pile body; The upsetting head has a conical shape, and the conical angle θ is 20°-180°; The upsetting head has a runway type, a rounded rectangular shape, a square rectangular shape, or an elliptical shape, the shape of the through bar groove is adapted to the shape of the upsetting head, and the size of the upsetting head is smaller than the size of the through bar hole.

15. The reinforced precast pile according to claim 14, characterized in that: The pile sleeve extends out of the concrete at both ends of the precast pile, and a part of the pile sleeve extending out of the concrete is matched with the connecting step of the end plate.

16. The reinforced precast pile according to claim 14, characterized in that: A metal indentation is arranged on the side of the pile sleeve in contact with the concrete.

17. The reinforced precast pile according to claim 14, characterized in that: A sealing device is arranged outside the upsetting head of the prestressed steel bar.

18. The reinforced precast pile according to claim 17, characterized in that: The sealing device comprises a non-metallic material, and can withstand a temperature of at least 60°.

19. The reinforced precast pile according to claim 14, characterized in that: An inner concave or outer convex thread is arranged on the outer surface of the prestressed steel bar.

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