A precast pile and a pile end mechanism thereof

Abstract

The utility model discloses a pile end mechanism of precast pile, it includes: end plate, connecting component and annular connecting plate, the upper end of connecting component with annular connecting plate fixed connection, the lower extreme of connecting component with end plate fixed connection, connecting component is provided with a plurality, and the slurry passage is formed between adjacent connecting component, the outer contour of end plate exceeds the outer contour of annular connecting plate, annular connecting plate is provided with a plurality of through -hole, and connecting component avoids the through -hole setting. The utility model is further related to a kind of precast pile. The utility model not only can improve the bearing capacity of precast pile, and it is favorable to simplify construction procedure, improve construction efficiency.

Description

Technical Field

[0001] This utility model relates to a precast pile and its pile end mechanism, belonging to the field of pile foundation engineering technology. Background Technology

[0002] The traditional precast pile installation process mainly includes the following steps: 1. Drilling to the designed depth using mechanical drilling equipment; 2. Injecting cement grout, cement mortar, or fine stone concrete (collectively referred to as grout) into the lower half of the hole; 3. Inserting the precast pile into the hole, with the diameter of the precast pile slightly smaller than the diameter of the drilled hole, and the mortar in the hole filling the gap between the precast pile and the hole wall under the pressure of the precast pile; 4. Pressing or hammering the precast pile into the bearing layer at the bottom of the hole using pile driving machinery.

[0003] The bearing capacity of precast piles relies primarily on two aspects: the end (bottom) resistance of the pile and the friction between the side surface of the precast pile and the borehole wall. Current technology uses mechanical drilling equipment, which can only produce circular holes, and since precast piles are also circular, the limited surface area of ​​the precast pile results in relatively low friction between the side surface of the precast pile and the borehole wall, failing to fully utilize the bearing capacity of the precast pile. Furthermore, in softer soils, the drilled holes are prone to collapse, requiring repeated drilling operations, which is detrimental to improving construction efficiency. Simultaneously, the use of mechanical drilling equipment and the removal of excavated soil not only increases construction steps but also increases construction costs.

[0004] To address the aforementioned technical problems, the inventor's prior patent application (application number 2024231343685) discloses a precast pile and its pile end mechanism. The pile end mechanism mainly includes an end plate and a sleeve. The area of ​​the end plate is larger than the cross-sectional area of ​​the sleeve, and the sleeve has several through holes on its side wall. During precast pile construction, the pile end mechanism is fixed to the lower end of the precast pile body, i.e., the upper end of the sleeve is welded to the lower end of the precast pile body. However, this solution has the following shortcomings in practical use: 1. The sleeve with through holes in its side wall may have insufficient rigidity under extreme conditions, and the sleeve uses a large amount of steel, which is not conducive to cost reduction; 2. The sleeve and the precast pile body are connected on-site by welding. On-site welding requires temporary power, the welding environment and welding quality are poor (dependent on weather), and after welding, the weld needs to cool before pile driving can begin. Therefore, this solution needs further improvement. Utility Model Content

[0005] This utility model provides a precast pile and its pile end mechanism, which helps to reduce construction procedures, improve the bearing capacity of precast piles, and avoid welding operations on the construction site. The specific technical solution is as follows.

[0006] A pile end mechanism for a precast pile, characterized in that it comprises: an end plate, a connecting assembly, and an annular connecting plate, wherein the upper end of the connecting assembly is fixedly connected to the annular connecting plate, and the lower end of the connecting assembly is fixedly connected to the end plate; multiple connecting assemblies are provided, and grout channels are formed between adjacent connecting assemblies; the outer contour of the end plate extends beyond the outer contour of the annular connecting plate.

[0007] The annular connecting plate is provided with several through holes, and the connecting component is arranged to avoid the through holes.

[0008] Furthermore, the connecting assembly has an H-shaped cross-section, comprising two radial plate components and one circumferential plate component. Both the radial and circumferential plate components are perpendicular to the annular connecting plate. The radial plate components extend radially along the annular connecting plate, and the circumferential plate component extends circumferentially along the annular connecting plate. The H-shaped connecting assembly helps improve the overall strength of the pile end mechanism, maintain its structural stability, and prevents significant deformation of the end plate during construction.

[0009] Furthermore, the connecting component is a cylindrical part, and the axial direction of the cylindrical part is perpendicular to the annular connecting plate.

[0010] 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.

[0011] Furthermore, the pile end mechanism is made of metal. Preferably, it is made of welded steel.

[0012] Based on the same inventive concept, this utility model also relates to a precast pile, including 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; characterized in that the base plate is fixedly connected to the aforementioned pile end mechanism, the base plate is provided with screw holes, the through holes of the annular connecting plate are provided corresponding to the screw holes, and the annular connecting plate is fixed to the base plate by bolts; the outer contour of the end plate extends beyond the outer contour of the precast pile body.

[0013] Using the above technical solution, during on-site construction, only the pile end mechanism needs to be fixed to the lower end of the precast pile body with bolts. No modifications to the existing precast pile body are required. The precast pile is then driven into the soil using pile driving machinery. Because the end plate area is larger than the cross-sectional area of ​​the precast pile body, the end plate is pushed into the soil during the driving process, creating a pile hole with a cross-sectional area larger than that of the precast pile body. Simultaneously, grout is placed in the central through-hole of the precast pile body. As the precast pile is continuously driven into the soil, the grout fills the gap between the precast pile body and the pile hole through the grout channel of the pile end mechanism. On the one hand, it eliminates the need for separate mechanical drilling equipment, reducing construction steps; on the other hand, it increases the bearing capacity of the precast pile. The larger area of ​​the end plate compared to the cross-sectional area of ​​the precast pile body not only increases the pile end resistance but also helps to expand the sidewall area of ​​the pile hole, thereby increasing the friction between the side surface of the precast pile and the hole wall. By eliminating the sleeve in the previous design, not only was steel consumption reduced, but the structural stability of the pile end mechanism was also improved. At the same time, the pile end mechanism and the precast pile body were connected by bolts, avoiding welding operations on the construction site, which not only simplified the connection method but also made it unaffected by welding quality.

[0014] Furthermore, the edge of the end plate is serrated. Compared to a circular end plate, the serrated end plate has a significantly increased perimeter, thereby increasing the borehole wall area and thus improving the friction between the precast pile and the borehole wall. In contrast, traditional construction methods using mechanical drilling equipment can only form circular boreholes, not serrated (irregular) boreholes.

[0015] Furthermore, the end plate comprises a square main body and four right-angled isosceles triangles located in the same plane, with the four right-angled isosceles triangles respectively fixed to the center of the four edges of the square main body. The end plate is typically formed from steel plate, which helps save steel consumption. The four right-angled isosceles triangles can be cut from a square steel plate and then welded to the square main body to form a complete end plate. Preferably, each corner of the end plate is machined with a right-angled notch. The right-angled notch helps prevent (or reduce) bending (warping) of the end plate when it is pressed into the soil, without reducing the perimeter of the end plate. Attached Figure Description

[0016] Figure 1 This is a partial schematic diagram of the precast pile of this utility model;

[0017] Figure 2 This is a schematic diagram of the base plate;

[0018] Figure 3 This is a schematic diagram of the annular connecting plate;

[0019] Figure 4 This is a schematic diagram of the connecting components;

[0020] Figure 5 This is a schematic diagram showing the connection components and the annular connecting plate combined together;

[0021] Figure 6 This is a top view of the pile end mechanism (connecting components are shown in dashed lines);

[0022] Figure 7 This is a bottom view of the pile end mechanism;

[0023] Figure 8 This is a construction diagram of the precast pile of this utility model;

[0024] Figure 9 yes Figure 8 Enlarged view of region A in the image.

[0025] In the diagram: 1. Precast pile body, 1.1. Central through hole, 1.2. Bottom plate, 1.2.1. Screw hole, 2.2.1. Pile end mechanism, 2.1. Square body, 2.1.1. Right-angled isosceles triangle, 2.1.2. Right-angled notch, 2.1.3. Connecting component, 2.2. Radial plate component, 2.2.1. Circumferential plate component, 2.2.2. Annular connecting plate, 2.3. Through hole, 2.3.1. Grout channel, 2.4. Rib, 2.5. Chamfer, 2.5.1. Pile hole, 3. Grout, 4. Pile driving machinery, 5. Bolt, 6. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings.

[0027] See Figures 1-7 A precast pile includes a precast pile body 1 and a base plate 1.2. The precast pile body 1 has a central through hole 1.1 inside. The base plate 1.2 is fixed to the lower end of the precast pile body 1 and has screw holes 1.2.1. The base plate 1.2 is fixedly connected to the pile end mechanism 2.

[0028] The pile end mechanism 2 includes an end plate 2.1, a connecting component 2.2, and an annular connecting plate 2.3. The upper end of the connecting component 2.2 is fixedly connected to the annular connecting plate 2.3, and the lower end of the connecting component 2.2 is fixedly connected to the end plate 2.1. Multiple connecting components 2.2 are provided, and grout channels 2.4 are formed between adjacent connecting components 2.2. The outer contour of the end plate 2.1 extends beyond the outer contour of the annular connecting plate 2.3 and also extends beyond the outer contour of the precast pile body 1. The annular connecting plate 2.3 is provided with several through holes 2.3.1, and the connecting component 2.2 is provided to avoid the through holes 2.3.1. Both the annular connecting plate 2.3 and the bottom plate 1.2 have a central through hole corresponding to the central through hole 1.1 of the precast pile body 1, and grout 4 can enter the grout channel 2.4 from the central through hole 1.1 of the precast pile body 1.

[0029] Preferably, such as Figures 6-7As shown, the edge of end plate 2.1 is serrated. Compared to a circular end plate 2.1, the serrated end plate 2.1 has a significantly increased perimeter, thereby increasing the hole wall area of ​​the pile hole 3 and thus improving the friction between the precast pile and the hole wall. Traditional construction methods using mechanical drilling equipment can only form circular pile holes 3, not serrated (irregular) pile holes 3. Preferably, as... Figure 7 As shown, the end plate 2.1 includes a square main body 2.1.1 and four right-angled isosceles triangles 2.1.2 located in the same plane. The four right-angled isosceles triangles 2.1.2 are respectively fixed to the center of the four edges of the square main body 2.1.1. The end plate 2.1 is usually formed from steel plate. This method helps to save steel. The four right-angled isosceles triangles 2.1.2 can be cut from a square steel plate and then welded to the square main body 2.1.1 to form a complete end plate 2.1. Preferably, as shown... Figure 7 As shown, each corner of end plate 2.1 is machined with a right-angle notch 2.1.3. The right-angle notch 2.1.3 helps to prevent (or reduce) bending (warping) of end plate 2.1 when it is pressed into the soil, without reducing the perimeter of end plate 2.1.

[0030] Preferably, such as Figures 4-6 As shown, the connecting assembly 2.2 has an H-shaped cross-section and includes two radial plate components 2.2.1 and one circumferential plate component 2.2.2. Both radial plate components 2.2.1 and circumferential plate components 2.2.2 are perpendicular to the annular connecting plate 2.3. The radial plate component 2.2.1 extends radially along the annular connecting plate 2.3, and the circumferential plate component 2.2.2 extends circumferentially along the annular connecting plate 2.3. The upper ends of the radial plate components 2.2.1 and circumferential plate components 2.2.2 are fixed to the base plate 1.2, and the lower ends are fixed to the end plate 2.1. The circumferential plate component 2.2.2 can be an arc-shaped plate or a circular plate. The H-shaped connecting assembly 2.2 helps to improve the overall strength of the pile end mechanism, maintain its structural stability, and prevent large deformation of the end plate during construction. In another embodiment, the connecting assembly 2.2 can be a cylindrical component (not shown), with its axial direction perpendicular to the annular connecting plate.

[0031] Preferably, such as Figure 1 , Figure 7As shown, a rib is provided below the end plate 2.1, perpendicular to the end plate 2.1, and fixedly connected to the end plate 2.1; preferably, four ribs are distributed in a cross shape below the end plate 2.1. By providing ribs, on the one hand, the rigidity of the end plate 2.1 is improved, which helps to prevent or reduce bending at the end; on the other hand, the generally vertical ribs 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 2.5 is provided with a chamfer 2.5.1.

[0032] Preferably, the pile end mechanism 2 is made of metal material, and more preferably it is made of welded steel.

[0033] Using the technical solution of this utility model, during on-site construction, it is only necessary to fix the pile end mechanism 2 to the lower end of the precast pile body 1 without making any modifications to the existing precast pile body 1. The precast pile is pressed into the soil using pile driving machinery. Since the area of ​​the end plate 2.1 is larger than the cross-sectional area of ​​the precast pile body 1, the end plate 2.1 is squeezed out of the soil during the pressing process, thus forming a pile hole 3 with a cross-sectional area larger than that of the precast pile body 1. At the same time, grout is placed in the cavity 1.1 of the precast pile body 1. As the precast pile is continuously pressed into the soil, the grout 4 is filled from the grout channel 2.4 of the pile end mechanism 2 into the gap between the precast pile body 1 and the pile hole 3. On the one hand, it eliminates the need for separate mechanical drilling equipment, reducing construction steps; on the other hand, it improves the bearing capacity of the precast pile. The area of ​​the end plate 2.1 is larger than the cross-sectional area of ​​the precast pile body 1, which not only increases the pile end resistance but also helps to expand the side wall area of ​​the pile hole 3, thereby increasing the friction between the side surface of the precast pile and the hole wall. The existing precast piles already have a metal base plate 1.2 at the bottom. When using the pile end mechanism 2 of this utility model, there is no need to change the structure of the existing precast piles, which greatly improves the practicality.

[0034] like Figure 8 , Figure 9 As shown, the construction process of the precast piles of this utility model mainly includes the following steps:

[0035] 1. Fix the pile end mechanism 2 to the bottom plate 1.2 at the lower end of the precast pile body 1 using bolts 6;

[0036] 2. The precast pile is driven into the soil using pile driving machinery, and the end plate 2.1 squeezes the soil to form the pile hole 3; during the process of forming the pile hole 3, the grout 4 in the cavity 1.1 of the precast pile body 1 continuously flows from the grout channel 2.4 of the pile end mechanism 2 into the gap between the precast pile body 1 and the pile hole 3.

[0037] 3. When the precast pile reaches the designed depth, the grout 4 fills the gap between the precast pile body 1 and the pile hole 3. After the grout 4 solidifies, the precast pile construction is completed.

[0038] 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 pile end mechanism for a precast pile, characterized in that, include: The assembly comprises an end plate (2.1), a connecting component (2.2), and an annular connecting plate (2.3). The upper end of the connecting component (2.2) is fixedly connected to the annular connecting plate (2.3), and the lower end of the connecting component (2.2) is fixedly connected to the end plate (2.1). Multiple connecting components (2.2) are provided, and a slurry channel (2.4) is formed between adjacent connecting components (2.2). The outer contour of the end plate (2.1) extends beyond the outer contour of the annular connecting plate (2.3). The annular connecting plate (2.3) is provided with a plurality of through holes (2.3.1), and the connecting component (2.2) is provided to avoid the through holes (2.3.1).

2. The pile end mechanism of a precast pile according to claim 1, characterized in that, The connecting assembly (2.2) has an H-shaped cross-section and includes two radial plate components (2.2.1) and one circumferential plate component (2.2.2). Both the radial plate components (2.2.1) and the circumferential plate component (2.2.2) are arranged perpendicular to the annular connecting plate (2.3). The radial plate components (2.2.1) extend radially along the annular connecting plate (2.3), and the circumferential plate component (2.2.2) extends circumferentially along the annular connecting plate (2.3).

3. The pile end mechanism of a precast pile according to claim 1, characterized in that, The connecting component (2.2) is a cylindrical part, and the axial direction of the cylindrical part is perpendicular to the annular connecting plate (2.3).

4. The pile end mechanism of a precast pile according to claim 1, characterized in that, A rib (2.5) is provided below the end plate (2.1), the rib (2.5) is perpendicular to the end plate (2.1), and the rib (2.5) is fixedly connected to the end plate (2.1).

5. The pile end mechanism of a precast pile according to claim 4, characterized in that, The four ribs (2.5) are arranged in a cross shape below the end plate (2.1).

6. The pile end mechanism of a precast pile according to claim 1, characterized in that, The pile end mechanism (2) is made of metal.

7. A precast pile, comprising a precast pile body (1) and a base plate (1.2), wherein the precast pile body (1) has a central through hole (2.3.1), and the base plate (1.2) is fixed to the lower end of the precast pile body (1); characterized in that, The base plate (1.2) is fixedly connected to the pile end mechanism as described in any one of claims 1-6. The base plate (1.2) is provided with a screw hole (1.2.1). The through hole (2.3.1) of the annular connecting plate (2.3) is provided corresponding to the screw hole (1.2.1). The annular connecting plate (2.3) is fixed to the base plate (1.2) by bolts. The outer contour of the end plate (2.1) extends beyond the outer contour of the precast pile body (1).

8. The pile end mechanism of a precast pile according to claim 7, characterized in that, The edge of the end plate (2.1) is serrated.

9. The pile end mechanism of a precast pile according to claim 7, characterized in that, The end plate (2.1) includes a square main body (2.1.1) and four right-angled isosceles triangles (2.1.2) located in the same plane. The four right-angled isosceles triangles (2.1.2) are respectively fixed to the middle of the four edges of the square main body (2.1.1).

10. The pile end mechanism of a precast pile according to claim 9, characterized in that, Each corner of the end plate (2.1) is machined with a right-angle notch (2.1.3).

Images