Precast pile

Abstract

The utility model discloses a precast pile which comprises a precast pile main body (1) and a bottom plate (2), the precast pile main body (1) is provided with a central through hole (1.1), and the bottom plate (2) is fixed at the lower end of the precast pile main body (1); an end plate (3) is further included, and the end plate (3) is provided with a positioning protrusion (3.4); the end plate (3) is fixedly connected with the bottom plate (2), the positioning bulge (3.4) is arranged around the center of the central through hole (1.1), and the outer edge of the positioning bulge (3.4) is matched with the side wall of the central through hole (1.1); the positioning bulge (3.4) is a sleeve (3.1), and the upper end of the sleeve (3.1) is inserted into the central through hole (1.1); and a water stop structure (5) is arranged between the side wall of the central through hole (1.1) and the sleeve. Compared with the prior art, not only is the water stop effect improved, but also the horizontal shear resistance of the end plate is improved; and meanwhile, the mounting process of a traditional pile tip is simplified, and the mounting efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a precast pile and belongs to the field of precast pile technology. Background Technology

[0002] During the implantation of precast piles into soil and rock, if one side of the precast pile has hard geological conditions such as rock and the other side has weaker geological conditions, the end plate may be damaged by horizontal shear force, which may destroy the connection between the end plate and the precast pile. Therefore, how to improve the horizontal shear resistance of the end plate is also a problem currently faced by precast piles.

[0003] Furthermore, existing precast piles all have a central through-hole. The construction method involves transporting the precast pile to the construction site, welding end plates to the lower end of the pile to seal the central through-hole, and then using pile driving machinery to implant the pile into the soil and rock. However, existing precast piles often fail to effectively stop water flow after being implanted into the soil and rock. Because groundwater exists near the bottom of the precast pile, and the welded end plates cannot adequately seal the central through-hole, the external water pressure is high, while the pressure (air pressure) inside the central through-hole is lower. This allows groundwater to continuously flow into the central through-hole from the gap between the end plates and the pile. The continuously flowing groundwater damages the geological conditions of the pile's side surface and bottom, leading to soil softening and reducing the pile's bearing capacity. The existing method for solving water-stopping is to fill a certain amount of concrete into the central through hole after the precast pile is implanted into the soil. However, the concrete shrinks when it solidifies, which creates a gap between the concrete and the side wall of the precast pile. Therefore, the effect of preventing groundwater from flowing into the central through hole is not ideal. Utility Model Content

[0004] In order to overcome the problems existing in the prior art, this utility model provides a precast pile, and the specific technical solution is as follows.

[0005] A precast pile includes a precast pile body and a base plate, wherein the precast pile body has a central through hole and the base plate is fixed to the lower end of the precast pile body;

[0006] The feature is that it further includes an end plate, the end plate being provided with a positioning protrusion; the end plate is fixedly connected to the base plate, the positioning protrusion is arranged around the center of the central through hole and the outer edge of the positioning protrusion matches the side wall of the central through hole.

[0007] Using the above technical solution, when installing the end plate, the positioning protrusions of the end plate are inserted into the central through hole. The positioning protrusions and the sidewall of the central through hole cooperate to achieve centering and positioning of the end plate. After the end plate is fixedly connected to the base plate, the positioning protrusions can significantly improve the horizontal shear resistance of the end plate. Specifically, the number of positioning protrusions is greater than or equal to two, distributed around the center of the central through hole; the matching of the positioning protrusions with the sidewall of the central through hole means that the positioning protrusions abut against the sidewall of the central through hole, or there is a very small gap between the positioning protrusions and the sidewall of the central through hole.

[0008] Furthermore, the positioning protrusion is a sleeve, the upper end of which is inserted into the central through hole; a water-stopping structure is provided between the sidewall of the central through hole and the sleeve. By providing a sleeve on the end plate and a water-stopping structure between the sleeve and the central through hole, groundwater outside the precast pile can be effectively prevented from flowing into the central through hole, thus avoiding the problems of geological softening and reduced bearing capacity of the precast pile caused by groundwater flowing into the central through hole. At the same time, the sleeve being inserted into the central through hole can significantly improve the horizontal shear resistance of the end plate, ensuring that the end plate can be stably and reliably fixed to the precast pile body during the pile planting process.

[0009] Furthermore, the water-stopping structure is a rubber ring or a rubber sleeve.

[0010] Furthermore, the water-stopping structure is made of water-swellable rubber.

[0011] Furthermore, the base plate is provided with screw holes, and the end plate is provided with mounting holes corresponding to the screw holes. The end plate is fixed to the base plate with bolts. Using bolts to fix the end plate simplifies the installation process, and existing precast piles already have pre-drilled screw holes (tensioning holes) on their base plates. Therefore, the solution proposed in this application does not require any modifications to the existing precast piles. Compared to the existing welding method, using bolts to fix the end plate is more efficient because welded end plates require a longer cooling time to ensure the reliability of the welded connection, while bolted end plates allow for immediate precast pile driving.

[0012] Furthermore, the end plate is fixed to the base plate by welding. Although fixing the end plate with bolts is simple and efficient, in the case of setting a water-stopping structure, the traditional welding fixing method can also achieve the water-stopping purpose of this application.

[0013] Furthermore, a rib is provided below the end plate, the rib being perpendicular to the end plate and fixedly connected to it; preferably, the four ribs are distributed in a cross shape below the end plate. By providing the ribs, the rigidity of the end plate is improved, which helps prevent or reduce bending at the end; furthermore, the generally vertical ribs help ensure that the entire precast pile remains vertical when pressed into the soil, preventing or reducing tilting. Preferably, the lower outer end of the rib is chamfered.

[0014] In a preferred embodiment, the positioning protrusion is a radial protruding rib. Preferably, the radial protruding rib is cross-shaped, and the radial protruding rib and the four ribs are arranged in a one-to-one correspondence. The radial protruding rib can define the planar position of the end plate relative to the precast pile, which is beneficial for rapid positioning; the radial protruding rib can significantly enhance shear resistance; the radial protruding rib and the rib below the end plate coordinate with each other, which is beneficial for improving the stiffness of the end plate and reducing the height of the ribs and the amount of steel used.

[0015] Compared with the prior art, this invention not only improves the water-stopping effect, but also helps to improve the horizontal shear resistance of the end plate; at the same time, it simplifies the traditional pile tip installation process and improves installation efficiency. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of the precast pile of Embodiment 1 of this utility model;

[0017] Figure 2 This is a bottom view of the precast pile of Embodiment 1 of this utility model;

[0018] Figure 3 This is a cross-sectional schematic diagram of the precast pile body and bottom plate of Example 1;

[0019] Figure 4 This is a bottom view of the precast pile body and base plate of Example 1;

[0020] Figure 5 This is a schematic diagram of the end plate of Embodiment 1;

[0021] Figure 6 This is a bottom view of the end plate of Embodiment 1;

[0022] Figure 7 This is a top view of the end plate of Embodiment 1;

[0023] Figure 8 This is a top view of the end plate of Embodiment 2;

[0024] Figure 9 This is a front view of the end plate of Embodiment 3;

[0025] Figure 10 This is a top view of the end plate of Embodiment 3.

[0026] In the diagram: 1. Precast pile body, 1.1. Central through hole, 1.2. Reinforcing bar, 2. Bottom plate, 2.1. Screw hole, 3. End plate, 3.1. Sleeve, 3.2. Mounting hole, 3.3. Positioning protrusion, 3.4. Radial protruding rib plate, 3.5. Bolt, 4. Water-stop structure, 5. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings.

[0028] Example 1

[0029] See Figures 1-7 A precast pile includes a precast pile body 1, a base plate 2, and an end plate 3. The precast pile body 1 has a central through hole 1.1. The base plate 2 is fixed to the lower end of the precast pile body 1. The end plate 3 is provided with a sleeve 3.1 (a type of positioning protrusion). The end plate 3 is fixedly connected to the base plate 2. The upper end of the sleeve 3.1 is inserted into the central through hole 1.1. A water-stopping structure 5 is provided between the side wall of the central through hole 1.1 and the sleeve 3.1. The water-stopping structure 5 is a rubber ring or a rubber sleeve. Alternatively, the water-stopping structure 5 is water-swellable rubber. The top end of the sleeve 3.1 has an inclined wedge-shaped surface to facilitate the insertion of the sleeve 3.1 into the central through hole 1.1.

[0030] The precast pile body 1 is a tubular reinforced concrete structure, with the ends of the internal reinforcing bars 1 and 2 fixed to the base plate 2. After concrete is poured into the mold, the precast pile body 1 is formed. Both the base plate 2 and the end plate 3 are made of metal materials, preferably steel.

[0031] There are two ways to connect end plate 3 and base plate 2.

[0032] The first method is welding, where end plate 3 is fixed to base plate 2 by welding, which is the traditional method of fixing end plate 3. The second method is bolting, where base plate 2 has bolt holes 2.1, and end plate 3 has mounting holes 3.2 corresponding to bolt holes 2.1. End plate 3 is fixed to base plate 2 by bolts 4. Using bolts 4 to fix end plate 3 simplifies the installation process, and existing precast piles already have pre-drilled bolt holes (tensioning holes) on base plate 2, so the proposed solution does not require any modifications to the existing precast piles. Using bolts to fix end plate 3 is more efficient than welding, as welding requires a longer cooling time to ensure the reliability of the welded connection, while bolting allows for immediate precast pile driving. Depending on the required stress, the number of mounting holes 3.2 and bolts 4 can be less than the number of bolt holes 2.1.

[0033] Preferably, a rib plate 3.3 is provided below the end plate 3, the rib plate 3.3 is perpendicular to the end plate 3, and the rib plate 3.3 is fixedly connected to the end plate 3; preferably, four rib plates 3.3 are distributed in a cross shape below the end plate 3. By providing rib plates 3.3, on the one hand, the rigidity of the end plate 3 is improved, which helps to prevent or reduce bending at the end; on the other hand, the generally vertical rib plates 3.3 help to ensure that the entire precast pile remains vertical when pressed into the soil, preventing or reducing tilting of the precast pile. Preferably, the lower outer end of the rib plate 3.3 is chamfered.

[0034] This invention, by setting a sleeve 3.1 on the end plate 3 and a water-stop structure between the sleeve 3.1 and the central through hole 1.1, effectively prevents groundwater from flowing into the central through hole 1.1 outside the precast pile, thus avoiding the problems of geological softening and reduced bearing capacity of the precast pile caused by groundwater flowing into the central through hole 1.1. At the same time, the sleeve 3.1, when inserted into the central through hole 1.1, significantly improves the horizontal shear resistance of the end plate 3 and also helps prevent the bolt 4 from being sheared, ensuring that the end plate 3 can be stably and reliably fixed to the precast pile body 1 during the pile planting process.

[0035] Example 2

[0036] like Figure 8 As shown, the difference between Embodiment 2 and Embodiment 1 is that the positioning protrusion 3.4 is not in the form of a sleeve 3.1. Instead, the positioning protrusion 3.4 is arranged around the center of the central through hole 1.1, with a number greater than or equal to 2 (preferably 3-5). The positioning protrusion 3.4 matches the sidewall of the central through hole 1.1, and has an inclined wedge-shaped surface to facilitate insertion of the positioning protrusion 3.4 into the central through hole 1.1. Of course, Embodiment 2 also lacks the water-stopping structure 5 of Embodiment 1. The positioning protrusion 3.4 can significantly improve the horizontal shear resistance of the end plate 3.

[0037] Example 3

[0038] like Figures 9-10 As shown, the difference between Embodiment 3 and Embodiment 2 is that the positioning protrusion is a radial protruding rib plate 3.5. Preferably, the radial protruding rib plate 3.5 is cross-shaped, and the radial protruding rib plate 3.5 and the four rib plates 3.4 are arranged in a one-to-one correspondence. The radial protruding rib plate 3.5 can limit the planar position of the end plate 3 relative to the precast pile body 1, which is conducive to rapid positioning; the radial protruding rib plate 3.5 can significantly enhance the shear resistance; the radial protruding rib plate 3.5 and the rib plate 3.3 below the end plate 3 coordinate with each other, which is conducive to improving the rigidity of the end plate and reducing the height of the rib plate 3.3 and the amount of steel used.

[0039] The embodiments of the present invention have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention is not limited to the specific embodiments described above; these embodiments are merely illustrative and not limiting. Those skilled in the art, under the guidance of the present invention, can make many modifications without departing from the spirit and scope of the claims, and all such modifications fall within the protection scope of the present invention.

Claims

1. A precast pile, comprising a precast pile body (1) and a base plate (2), wherein the precast pile body (1) has a central through hole (1.1) and the base plate (2) is fixed to the lower end of the precast pile body (1); Its features are, It also includes an end plate (3), which is provided with a positioning protrusion (3.4); the end plate (3) is fixedly connected to the bottom plate (2), the positioning protrusion (3.4) is arranged around the center of the central through hole (1.1) and the outer edge of the positioning protrusion (3.4) matches the side wall of the central through hole (1.1).

2. A precast pile according to claim 1, characterized in that, The positioning protrusion (3.4) is a sleeve (3.1), the upper end of which is inserted into the central through hole (1.1); a water-stopping structure (5) is provided between the side wall of the central through hole (1.1) and the sleeve.

3. A precast pile according to claim 2, characterized in that, The water-stopping structure (5) is a rubber ring or rubber sleeve.

4. A precast pile according to claim 2, characterized in that, The water-stopping structure (5) is made of water-swellable rubber.

5. A precast pile according to claim 2, characterized in that, The base plate (2) is provided with screw holes (2.1), and the end plate (3) is provided with mounting holes (3.2) corresponding to the screw holes (2.1). The end plate (3) is fixed to the base plate (2) by bolts (4).

6. A precast pile according to claim 2, characterized in that, The end plate (3) is fixed to the base plate (2) by welding.

7. A precast pile according to claim 2, characterized in that, A rib (3.3) is provided below the end plate (3), the rib (3.3) is perpendicular to the end plate (3), and the rib (3.3) is fixedly connected to the end plate (3).

8. A precast pile according to claim 7, characterized in that, The four ribs (3.3) are arranged in a cross shape below the end plate (3).

9. A precast pile according to claim 1 or 8, characterized in that, The positioning protrusion (3.4) is a radial protruding rib (3.5).

10. A precast pile according to claim 9, characterized in that, The radial protruding ribs (3.5) are cross-shaped, and the radial protruding ribs (3.5) and the four ribs (3.3) are arranged in a one-to-one correspondence.

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