End plate and precast pile

Abstract

The utility model relates to the technical field of precast piles, and particularly discloses an end plate and a precast pile, the end plate comprises an end plate main body, a plurality of anchoring holes are arranged on the end plate main body at intervals, each anchoring hole comprises a bolt hole, a sliding rib groove and two upset head anchor holes, and the bolt hole is connected with the sliding rib groove. The upset head anchor holes are used for installing upset heads of the steel bars, due to the fact that two upset head anchor holes are formed in each anchoring and tensioning hole, the upset heads of two steel bars can be installed, under the condition that the number of the steel bars is not changed, the number of the anchoring and tensioning holes can be reduced by half, the strength of the end plate body is improved, and the service life of the precast pile is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of precast piles, and specifically to an end plate and a precast pile. Background Technology

[0002] With the rapid development of super high-rise buildings and large-span structures, modern engineering places dual demands on foundation bearing systems: they must possess efficient vertical load transfer capabilities and meet horizontal resistance requirements under complex working conditions. Traditional natural foundations have shown significant limitations in resisting the vertical and horizontal loads transferred from the superstructure. Currently, prestressed concrete piles are commonly used in engineering to form pile foundations to meet load-bearing requirements. However, under complex geological conditions such as high-rise buildings and offshore photovoltaic projects, pile foundations often bear large bending moment loads, and the bending resistance performance of traditional prestressed concrete piles is insufficient to meet the actual engineering needs.

[0003] In existing technologies, optimizing the arrangement of longitudinal reinforcement is commonly used to improve the bending resistance of pile foundations. For example, Chinese patent CN222349743U discloses a photovoltaic pile for offshore wind farms. Its technical solution involves arranging longitudinal reinforcement on the first and second circumferences centered on the pile's central axis, forming two rows of staggered reinforcement to improve the overall bending and shear strength of the pile. While this solution improves pile performance to some extent, its end-plate design for fixing the longitudinal reinforcement still has significant drawbacks: each set of through-hole units arranged radially can only fix a single prestressed steel bar, requiring numerous through-holes in the end plate. This not only weakens the overall strength and stability of the end plate but may also cause uneven stress on the end plate after prestressing due to excessive hole spacing, affecting flatness. Furthermore, the dense hole structure easily leads to stress concentration, which may accelerate fatigue damage of the end plate under long-term loads, thereby reducing the durability of the precast pile. Summary of the Invention

[0004] This utility model addresses the aforementioned problems. The purpose of this utility model is to provide an end plate and a precast pile, in which two upset head anchor holes are provided in each anchor tension hole, that is, each anchor tension hole can fix two steel bars, which can reduce the number of anchor tension holes, increase the strength of the end plate, and improve the durability of the precast pile.

[0005] To achieve the above objectives, this utility model provides an end plate, comprising:

[0006] The end plate body has a plurality of anchor tensioning holes, which are spaced apart on the end plate body.

[0007] Each of the anchor holes includes a bolt hole, two sliding grooves, and two upset head anchor holes. The two upset head anchor holes are arranged on both sides of the bolt hole symmetrically. Each upset head anchor hole is connected to the bolt hole by one of the sliding grooves.

[0008] According to the above-described end plate, the main body of the end plate is generally circular, and a plurality of anchor tension holes are arranged in a ring on the main body of the end plate, and the centers of the plurality of bolt holes are all located on the same circumference.

[0009] According to the above-described end plate, a first straight line is provided between the center of the end plate body and the center of the bolt hole, and a second straight line is provided between the centers of the two upset head anchor holes in the same anchor tension hole, the second straight line coinciding with the first straight line.

[0010] According to the above-described end plate, a first straight line is provided between the center of the end plate body and the center of the bolt hole, and a second straight line is provided between the central axes of the two upset head anchor holes in the same anchor tension hole. A first included angle is provided between the second straight line and the first straight line, and the first included angle is greater than 0° and less than 90°.

[0011] According to the end plate described above, the first included angle is set to 45°.

[0012] According to the above-described end plate, the main body of the end plate is generally square, and a plurality of anchor tensioning holes are generally arranged in a square on the main body of the end plate. The central axes of the plurality of bolt holes are all located on the same square, and a second straight line is provided between the central axes of two upset head anchor holes in the same anchor tensioning hole. The plurality of second straight lines are all directed toward the center of the main body of the end plate.

[0013] According to the above-described end plate, the main body of the end plate is generally square, and a plurality of anchor tension holes are arranged in a ring on the main body of the end plate, and the centers of the plurality of bolt holes are all located on the same circumference.

[0014] A first straight line is provided between the central axis of the end plate body and the central axis of the bolt hole, and a second straight line is provided between the central axes of the two upset head anchor holes in the same anchor tension hole, the second straight line coinciding with the first straight line.

[0015] According to the above-described end plate, a through hole is provided in the middle of the main body of the end plate, and the center of the through hole coincides with the center of the main body of the end plate.

[0016] A precast pile, comprising:

[0017] The pile body contains reinforcing steel bars.

[0018] As described above, the end plates are disposed at both ends of the pile body, and the upset heads of the reinforcing bars can be connected to the upset head anchor holes.

[0019] According to the precast pile described above, multiple upset head anchor holes are arranged to form a first anchor hole ring group and a second anchor hole ring group. Multiple steel bars constitute a first steel reinforcement cage and a second steel reinforcement cage. The first steel reinforcement cage and the second steel reinforcement cage are distributed radially within the pile body. Multiple upset heads in the first steel reinforcement cage can be inserted into multiple upset head anchor holes in the first anchor hole ring group, and multiple upset heads in the second steel reinforcement cage can be inserted into multiple upset head anchor holes in the second anchor hole ring group.

[0020] This utility model has the following beneficial effects:

[0021] 1. Each set of anchor holes is equipped with two upset head anchor holes, which can fix two steel bars, reduce the number of holes on the end plate, and improve the strength of the end plate;

[0022] 2. When the anchor tension holes are arranged radially inclined along the end plate, the prestressing tendons of the inner and outer steel cages form an oblique staggered arrangement at the end plate. After the staggered arrangement, the prestressing tendons are dispersed in the plane of the precast pile, increasing the anchorage range of the prestressing tendons, effectively improving the bond force between the concrete and the prestressing tendons, ensuring effective stress transfer, and thus enhancing the pile's ability to resist bending deformation. In addition, when cracks appear in the concrete of the precast pile, the staggered arrangement of the prestressing tendons can prevent crack propagation at different locations of crack development, making the crack distribution more dispersed, thereby reducing the intrusion of moisture and harmful substances in the surrounding soil into the pile body and corroding the prestressing tendons, ultimately significantly improving the durability and service life of the precast pile.

[0023] 3. The precast piles adopt a first and second steel cage arranged radially, which can effectively improve the bending resistance of the precast pile body. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1;

[0025] Figure 2 This is a schematic diagram of the overall structure of Embodiment 2;

[0026] Figure 3 This is a schematic diagram of the overall structure of Embodiment 3;

[0027] Figure 4 This is a schematic diagram of the overall structure of Embodiment 4;

[0028] Figure 5 This is a schematic diagram of the overall structure of Embodiment 5;

[0029] Figure 6 This is a schematic diagram of the overall structure of Embodiment Six;

[0030] Figure 7 A schematic diagram of the anchor tension hole structure of this utility model;

[0031] Figure 8 This is a cross-sectional view of the pile body in Example 7.

[0032] In the picture:

[0033] 100. End plate body; 110. Anchor tension hole; 111. Bolt hole; 112. Sliding groove; 113. Upsetting head anchor hole; 120. Through hole;

[0034] 200, Pile body; 210, First reinforcing cage; 220, Second reinforcing cage. Detailed Implementation

[0035] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0036] Example 1

[0037] like Figure 1 and Figure 7 As shown, an end plate includes an end plate body 100.

[0038] The end plate body 100 is provided with a plurality of anchor tension holes 110, which are arranged at intervals on the end plate body 100, and the centers of the plurality of anchor tension holes 110 are all located on the same circumference.

[0039] Specifically, each anchor tensioning hole 110 includes a bolt hole 111, two sliding bar grooves 112, and two upset head anchor holes 113. In this embodiment, the upset head anchor holes 113 are used to install the upset heads of the reinforcing bars. Since each anchor tensioning hole 110 is provided with two upset head anchor holes 113, it can install the upset heads of two reinforcing bars. With the number of reinforcing bars remaining unchanged, the number of anchor tensioning holes 110 can be reduced by half, thereby improving the strength of the end plate body 100 and increasing the service life of the precast pile.

[0040] Specifically, two upset head anchor holes 113 are arranged symmetrically on both sides of the bolt hole 111. Each upset head anchor hole 113 is connected to the bolt hole 111 by a sliding groove 112. The sliding groove 112 is located between the bolt hole 111 and the upset head anchor hole 113, and is used to connect the bolt hole 111 and the upset head anchor hole 113. The upset head of the reinforcing bar first enters into the bolt hole 111, and then slides into the upset head anchor hole 113 through the sliding groove 112, and then is fixed by bolt using the bolt hole 111.

[0041] In this embodiment, the end plate body 100 is circular, and multiple anchor tension holes 110 are arranged in a ring on the end plate body 100. The centers of multiple bolt holes 111 are all located on the same circumference, which can ensure that the distance between each anchor tension hole 110 and the edge of the end plate body 100 is the same, thereby ensuring that the end plate body 100 is subjected to uniform force and improving its strength.

[0042] In this embodiment, the anchor tensioning hole 110 is arranged radially along the end plate body 100. That is, a first straight line is provided between the center of the end plate body 100 and the center of the bolt hole 111. The direction of the first straight line is the radial direction of the end plate body 100 in this embodiment. A second straight line is provided between the centers of the two upset head anchor holes 113 in the same anchor tensioning hole 110. The second straight line coincides with the first straight line. That is, the two upset head anchor holes 113 are arranged radially along the end plate body 100, which facilitates drilling and other operations.

[0043] In this embodiment, the upset anchor holes 113 within the multiple anchor tension holes 110 can be divided into a first anchor hole group and a second anchor hole group. The upset anchor holes 113 in the first anchor hole group are external anchor holes, and the upset anchor holes 113 in the second anchor hole group are internal anchor holes. The centers of the multiple external anchor holes are all located on the first circumference, and the centers of the multiple internal anchor holes are all located on the second circumference. The diameter of the first circumference is larger than the diameter of the second circumference, which can simultaneously accommodate two steel cages of different diameters, reducing the number of openings.

[0044] In this embodiment, the distance between the outer edge of the outer anchor hole and the edge of the end plate body 100 should be greater than or equal to 30mm to avoid breakage at the edge of the end plate body 100 and to ensure the structural strength at the edge.

[0045] Of course, in this embodiment, the thickness of the end plate body 100 should be greater than or equal to 18 mm to prevent breakage along its axial direction.

[0046] In this embodiment, the end plate body 100 has a total of 10 anchor tensioning holes 110, which is half the number of anchor tensioning holes 110 compared to the existing technology.

[0047] Example 2

[0048] like Figure 2 and Figure 7 As shown, in this embodiment, the end plate body 100 is also circular, and multiple anchor tension holes 110 are arranged in a ring on the end plate body 100. The centers of multiple bolt holes 111 are all located on the same circumference, which can ensure that the distance between each anchor tension hole 110 and the edge of the end plate body 100 is the same, thereby ensuring that the end plate body 100 is subjected to uniform force and improving its strength.

[0049] Unlike Embodiment 1, a first straight line is provided between the center of the end plate body 100 and the center of the bolt hole 111, and a second straight line is provided between the centers of the two upset anchor holes 113 within the same anchor tension hole 110. A first included angle is provided between the second straight line and the first straight line. This first included angle is greater than 0° and less than 90°, as shown in the figure. In this embodiment, the first included angle is α, where 0° < α < 90°. When the anchor tension hole 110 is inclined radially along the pile, the prestressed tendons of the inner and outer steel cages form an obliquely staggered arrangement at the end plate body 100. After being staggered, the prestressing tendons are distributed in the plane of the precast pile, increasing the anchorage range of the prestressing tendons and effectively improving the bond between the concrete and the prestressing tendons. This ensures effective stress transfer and enhances the pile's ability to resist bending deformation. In addition, when cracks appear in the concrete of the precast pile, the staggered arrangement of the prestressing tendons can prevent crack propagation at different locations, making the crack distribution more dispersed. This reduces the intrusion of moisture and harmful substances from the surrounding soil into the pile and their corrosion of the prestressing tendons, ultimately significantly improving the durability and service life of the precast pile.

[0050] Furthermore, the first included angle was set to 45°. Experiments have shown that the bending deformation resistance is best when the first included angle is 45°.

[0051] Example 3

[0052] like Figure 3 and Figure 7 As shown, in this embodiment, the end plate body 100 is generally square, and the multiple anchor tension holes 110 are also generally square and arranged on the end plate body 100. The centers of the multiple bolt holes 111 are all located on the same square, and a second straight line is provided between the centers of the two upset head anchor holes 113 in the same anchor tension hole 110. The multiple second straight lines are all facing the center of the end plate body 100. That is, the shape of the end plate body 100 can be diverse, which does not affect the arrangement of the anchor tension holes 100.

[0053] The distances between the multiple upsetting anchor holes 113 and the edge of the end plate body 100 are not consistent. The minimum distance between the edge of the end plate body and the upsetting anchor hole 113 closest to the edge of the end plate body 100 is maintained at 30 mm or more. The thickness of the end plate body 100 is maintained at 18 mm or more. The number of anchor holes 110 is set to 8.

[0054] Example 4

[0055] like Figure 4 and Figure 7As shown in Embodiment 3, in this embodiment, the end plate body 100 is generally square, and the multiple anchor tension holes 110 are also arranged in a square on the end plate body 100. The centers of the multiple bolt holes 111 are all located on the same square, and a second straight line is provided between the centers of the two upset head anchor holes 113 in the same anchor tension hole 110. The multiple second straight lines are all directed toward the center of the end plate body 100.

[0056] However, unlike Embodiment 3, it has a through hole 120 in the middle of the end plate body 100. The center of the through hole 120 coincides with the center of the end plate body 100. That is, in this embodiment, the end plate body 100 is set as a hollow shape with an outer square and an inner circle.

[0057] Example 5

[0058] like Figure 5 and Figure 7 As shown, in this embodiment, the end plate body 100 is generally square, and a plurality of anchor tension holes 110 are arranged in a ring on the end plate body 100. The centers of the plurality of bolt holes 111 are all located on the same circumference. A first straight line is provided between the center of the end plate body 100 and the center of the bolt hole 111. A second straight line is provided between the centers of the two upset head anchor holes 113 in the same anchor tension hole 110. The second straight line coincides with the first straight line.

[0059] In this embodiment, the minimum distance between the upsetting head anchor hole 113 and the end plate body 100 needs to be maintained at more than 30mm, and the thickness of the end plate body 100 should be maintained at more than 18mm, so as to fully ensure the overall strength of the end plate body 100, and the number of anchor tension holes 110 is set to 8.

[0060] Example 6

[0061] like Figure 6 and Figure 7 As shown in Embodiment 5, in this embodiment, the end plate body 100 is generally square, and multiple anchor tension holes 110 are arranged in a ring on the end plate body 100. The centers of multiple bolt holes 111 are all located on the same circumference. A first straight line is provided between the center of the end plate body 100 and the center of the bolt hole 111. A second straight line is provided between the centers of two upset head anchor holes 113 in the same anchor tension hole 110. The second straight line coincides with the first straight line.

[0062] Unlike Embodiment 5, in this embodiment, the end plate body 100 has a through hole 120 in the middle, and the center of the through hole 120 coincides with the center of the end plate body 100.

[0063] Example 7

[0064] like Figure 7 and Figure 8 As shown, a precast pile includes a pile body 200 and the aforementioned end plate. Reinforcing bars are provided inside the pile body 200. The end plate is located at both ends of the pile body 200, and the upset heads of the reinforcing bars can be connected to the upset head anchor holes 113 of the end plate to fix the upset heads of the reinforcing bars.

[0065] In this embodiment, the upset head anchor holes 113 on the end plate are arranged in an inward and outward manner, forming two groups. Multiple upset head anchor holes 113 are arranged in an inward and outward manner to form a first anchor hole ring group and a second anchor hole ring group. Multiple reinforcing bars constitute a first reinforcing cage 210 and a second reinforcing cage 220. The first reinforcing cage 210 and the second reinforcing cage 220 are radially distributed within the pile body 200, i.e., arranged in an inward and outward interval. This arrangement helps to improve the overall strength of the pile body 200. Multiple upset heads in the first reinforcing cage 210 can be inserted into multiple upset head anchor holes 113 in the first anchor hole ring group, and multiple upset heads in the second reinforcing cage 220 can be inserted into multiple upset head anchor holes 113 in the second anchor hole ring group. In other words, the two upset head anchor holes 113 in each anchor tensioning hole can be used to install the upset head of one of the reinforcing bars in the first reinforcing cage 210 and the second reinforcing cage 220, thus reducing the number of anchor tensioning holes.

[0066] In this embodiment, both the first steel cage 210 and the second steel cage 220 include prestressed steel bars and spiral stirrups. The spiral stirrups are wrapped around the outside of the prestressed steel bars to form a steel cage. The upset head of the prestressed steel bar is installed in the upset head anchor hole 113 after passing through the bolt hole 111. That is, two types of steel bars, namely prestressed steel bars and spiral stirrups, are used together to improve its strength.

[0067] The technical solution of this utility model has been described in detail above with reference to the accompanying drawings. The described embodiments are used to help understand the concept of this utility model. The specific embodiments described herein are merely illustrative examples of the spirit of this utility model. Those skilled in the art to which this utility model pertains can make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0068] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0069] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0070] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0071] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. An end plate, characterized in that, include: The end plate body has a plurality of anchor tensioning holes, which are spaced apart on the end plate body. Each of the anchor holes includes a bolt hole, two sliding grooves, and two upset head anchor holes. The two upset head anchor holes are arranged on both sides of the bolt hole symmetrically. Each upset head anchor hole is connected to the bolt hole by one of the sliding grooves.

2. An end plate according to claim 1, characterized in that, The end plate body is generally circular, and the multiple anchor tension holes are arranged in a ring on the end plate body, with the centers of the multiple bolt holes all located on the same circumference.

3. An end plate according to claim 2, characterized in that, A first straight line is provided between the central axis of the end plate body and the central axis of the bolt hole, and a second straight line is provided between the central axes of the two upset head anchor holes in the same anchor tension hole, the second straight line coinciding with the first straight line.

4. An end plate according to claim 2, characterized in that, A first straight line is provided between the center of the end plate body and the center of the bolt hole, and a second straight line is provided between the centers of the two upset head anchor holes in the same anchor tension hole. A first included angle is provided between the second straight line and the first straight line, and the first included angle is greater than 0° and less than 90°.

5. An end plate according to claim 4, characterized in that, The first included angle is set to 45°.

6. An end plate according to claim 1, characterized in that, The end plate body is generally square, and the multiple anchor tensioning holes are arranged in a square on the end plate body. The centers of the multiple bolt holes are all located on the same square, and a second straight line is provided between the centers of two upset head anchor holes in the same anchor tensioning hole. The multiple second straight lines are all oriented towards the center of the end plate body.

7. An end plate according to claim 1, characterized in that, The end plate body is generally square, and the multiple anchor tension holes are arranged in a ring on the end plate body, and the central axes of the multiple bolt holes are all located on the same circumference; A first straight line is provided between the central axis of the end plate body and the central axis of the bolt hole, and a second straight line is provided between the central axes of the two upset head anchor holes in the same anchor tension hole, the second straight line coinciding with the first straight line.

8. An end plate according to claim 6 or 7, characterized in that, The end plate body has a through hole in the middle, and the center of the through hole coincides with the center of the end plate body.

9. A precast pile, characterized in that, include: The pile body contains reinforcing steel bars. The end plate as described in any one of claims 1-8 is disposed at both ends of the pile body, and the upset head of the reinforcing bar can be connected to the upset head anchor hole.

10. A precast pile according to claim 9, characterized in that, Multiple upset head anchor holes are arranged to form a first anchor hole ring group and a second anchor hole ring group. Multiple steel bars constitute a first steel bar cage and a second steel bar cage. The first steel bar cage and the second steel bar cage are distributed radially within the pile body. Multiple upset heads in the first steel bar cage can be inserted into multiple upset head anchor holes in the first anchor hole ring group, and multiple upset heads in the second steel bar cage can be inserted into multiple upset head anchor holes in the second anchor hole ring group.

Images