A new type of precast pile
By setting sharp corners and friction-enhancing structures on precast piles, combined with synchronous grouting technology, the problem of insufficient bearing capacity at the pile tip and pile body of existing precast piles has been solved, achieving a significant increase in pile tip area and friction force, and reducing material costs and construction complexity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUNAN QIYAN ZHUCHUANG ENGINEERING TECHNOLOGY CO LTD
- Filing Date
- 2025-05-06
- Publication Date
- 2026-05-26
Smart Images
Figure CN224281235U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a novel precast pile, belonging to the field of precast pile technology. Background Technology
[0002] The bearing capacity of precast piles mainly includes two aspects: one is the bearing capacity at the pile tip, which generally results in better bearing capacity due to a better bearing stratum and a larger pile tip area; the other is the frictional force of the pile body, which is the frictional force between the sidewall of the precast pile and the surrounding soil. How to efficiently improve these two aspects of bearing capacity has always been a goal pursued by the precast pile industry. Utility Model Content
[0003] This utility model provides a new type of precast pile, which can effectively improve the bearing capacity of precast piles. The specific technical solution is as follows.
[0004] A novel precast pile, characterized in that it comprises a precast pile body, a pile tip plate, and a pile tip rib plate, wherein the pile tip plate is fixed to the lower end of the precast pile body, and the pile tip rib plate is fixed below the pile tip plate.
[0005] The tip plate of the pile has a sharp corner protruding from the periphery of the precast pile body; the outer surface of the precast pile body is provided with a friction-enhancing structure.
[0006] The above technical solution employs a roughly horizontal pile tip plate and a roughly vertical pile tip rib plate at the pile tip, resulting in a simple structure that saves materials and costs. Furthermore, the non-conical pile tip structure and the pile tip rib plate facilitate cutting the soil during pile driving and maintain the pile's vertical penetration without deviation. The sharp angle of the pile tip plate not only increases the pile tip area but also creates a non-annular cavity between the precast pile body and the soil during pile driving. When this non-annular cavity is filled with grout, the contact area between the grout and the soil is larger than that of an annular space, thus improving the bearing capacity of the precast pile. The inventors discovered that in precast piles with sharp-angled pile tip plates, the friction between the grout and the soil is significantly enhanced after the grout solidifies. In this case, the area between the solidified grout and the surface of the precast pile body often becomes a weak point for pile foundation failure under ultimate load. Therefore, by setting a friction-enhancing structure on the outer surface of the precast pile body, a significant improvement in the friction of the precast pile body is achieved.
[0007] Furthermore, the precast pile body has a hollow structure with an internal cavity. A grouting hole is located at the lower end of the precast pile body, connecting the cavity to the outer surface of the precast pile body. By providing a grouting hole at the lower end of the precast pile body, the grouting process of the precast pile is simplified, and significant modifications to existing precast piles are not required. This patented solution can be directly implemented on existing precast piles.
[0008] Furthermore, the pile tip rib extends from the center of the pile tip plate to the pointed corner. This configuration of the pile tip rib increases the stiffness and load-bearing capacity of the pointed corner, ensuring that the pointed corner is not easily damaged during pile driving. Preferably, six pointed corners are evenly spaced on the outer periphery of the pile tip plate.
[0009] Furthermore, the pile tip plate is fixedly connected to the precast pile body by fasteners; or the pile tip plate is fixedly connected to the precast pile body by welding. That is, the pile tip plate and the precast pile body can be temporarily assembled and fixed on the construction site.
[0010] Furthermore, the friction-enhancing structure is a clamp or transverse rib fixed to the outer surface of the precast pile body. The clamp can be fixed to the outer surface of the precast pile body at intervals by means of structural adhesive, fastening bolts, or welding. The transverse rib can be integrally formed during the precast pile manufacturing process and can be intermittently distributed along the transverse direction.
[0011] Furthermore, the friction-enhancing structure comprises grooves and / or protrusions formed on the outer surface of the precast pile body. The grooves can be formed by roughening, and the protrusions can be formed by welding. Alternatively, they can be integrally formed during the precast pile manufacturing process.
[0012] Furthermore, the friction-enhancing structure consists of longitudinal ribs fixed to the outer surface of the precast pile body, extending along the axial direction of the precast pile body. The longitudinal ribs increase the integrity and friction between the precast pile body and the grout, and also contribute to increasing the strength of the precast pile body. The longitudinal ribs can be fixed to the outer surface of the precast pile body at intervals using structural adhesive, fastening bolts, or welding. Alternatively, they can be integrally formed during the precast pile manufacturing process and can be intermittently distributed along the longitudinal direction.
[0013] Furthermore, the friction-enhancing structure is a tie rod that penetrates and is fixed to the precast pile body, with both ends of the tie rod protruding from the outer surface of the precast pile body. Through holes can be pre-drilled or drilled in the precast pile body, through which the tie rod passes and is fixedly connected to the precast pile body. The fixing of the tie rod is very stable and reliable, significantly increasing the integrity between the grout and the precast pile body, preventing the connection between the two from becoming a weak point that can be damaged. The tie rod can also be pre-embedded inside the pile body during the precast pile manufacturing process.
[0014] Compared with the prior art, this utility model not only improves the bearing capacity of the pile end, but also overcomes the shortcomings of the prior art. It creatively enhances the friction of the pile body by increasing the friction-enhancing structure. Attached Figure Description
[0015] Figure 1 This is a partial cross-sectional schematic diagram of the novel precast pile of this utility model;
[0016] Figure 2 This is a bottom view of the novel precast pile of this utility model (one embodiment);
[0017] Figure 3 This is a bottom view of the novel precast pile of this utility model (another embodiment);
[0018] Figure 4 This is the first implementation of the friction-enhanced structure;
[0019] Figure 5 This is the second implementation of the friction-enhanced structure;
[0020] Figure 6 This is the third implementation of the friction-enhanced structure;
[0021] Figure 7 This is the fourth implementation of the friction-enhanced structure;
[0022] Figure 8 This is a construction schematic diagram of the novel precast pile of this utility model;
[0023] Figure 9 yes Figure 8 A magnified view of region A in the middle.
[0024] In the diagram: 1. Precast pile body, 1.1. Hoop, 1.2. Protrusion, 1.3. Longitudinal rib, 1.4. Tie rod, 1.5. Cavity, 1.6. Grouting hole, 1.4. Pile tip plate, 2. Sharp corner, 2.1. Pile tip rib plate, 3. Pile driving machinery, 4. Grout. Detailed Implementation
[0025] The present invention will now be described in further detail with reference to the accompanying drawings.
[0026] See Figures 1-9 A new type of precast pile includes a precast pile body 1, a pile tip plate 2, and a pile tip rib plate 3. The pile tip plate 2 is fixed to the lower end of the precast pile body 1, and the pile tip rib plate 3 is fixed below the pile tip plate 2.
[0027] The pile tip plate 2 has a pointed corner 2.1 protruding from the periphery of the precast pile body 1; the outer surface of the precast pile body 1 is provided with a friction-enhancing structure. The pile tip plate 2 can have a large area, capable of completely covering the end of the precast pile body 1 (e.g., Figure 2 (As shown), it can also have a smaller area, with only the sharp corner 2.1 protruding from the outer perimeter of the precast pile body 1 (such as...). Figure 3 (As shown). The precast pile body 1 is a hollow structure with a cavity 1.5 inside. The lower end of the precast pile body 1 has a grouting hole 1.6, which connects the cavity 1.5 and the outer surface of the precast pile body.
[0028] Preferably, the pile tip rib 3 extends from the center of the pile tip plate 2 to the pointed corner 2.1. This arrangement of the pile tip rib 3 increases the rigidity and bearing capacity of the pointed corner 2.1, ensuring that the pointed corner 2.1 is not damaged during pile driving. Preferably, six pointed corners 2.1 are evenly spaced on the outer periphery of the pile tip plate 2. In use, the pile tip plate 2 is approximately horizontal, the pile tip rib 3 is approximately vertical, and the lower edge of the pile tip rib 3 is chamfered.
[0029] Furthermore, the pile tip plate 2 is fixedly connected to the precast pile body 1 by fasteners (such as bolts); or the pile tip plate 2 is fixedly connected to the precast pile body 1 by welding. That is, the pile tip plate 2 and the precast pile body 1 can be temporarily assembled and fixed on the construction site.
[0030] In a preferred embodiment, such as Figure 4 As shown, the friction-enhancing structure is a clamp or transverse rib 1.1 fixed to the outer surface of the precast pile body 1. The clamp 1.1 can be fixed to the outer surface of the precast pile body 1 at intervals by means of structural adhesive, fastening bolts, or welding. The clamp 1.1 structure is simple and easy to operate. The transverse rib 1.1 can be integrally formed during the precast pile manufacturing process and can be intermittently distributed along the transverse direction.
[0031] In a preferred embodiment, such as Figure 5 As shown, the friction-enhancing structure consists of a groove and / or a protrusion 1.2 formed on the outer surface of the precast pile body 1. The groove 1.2 can be formed by roughening, and the protrusion 1.2 can be formed by welding. Alternatively, the groove and / or protrusion 1.2 can be integrally formed during the precast pile manufacturing process.
[0032] In a preferred embodiment, such as Figure 6 As shown, the friction-enhancing structure consists of longitudinal ribs 1.3 fixed to the outer surface of the precast pile body 1, extending along the axial direction of the precast pile body 1. The longitudinal ribs 1.3 increase the integrity and friction between the precast pile body 1 and the grout, and also contribute to increasing the strength of the precast pile body 1. Furthermore, the structure is simple and easy to operate. The longitudinal ribs 1.3 can be fixed to the outer surface of the precast pile body 1 at intervals using structural adhesive, fastening bolts, or welding. Alternatively, the longitudinal ribs 1.3 can be integrally formed during the precast pile manufacturing process and can be intermittently distributed along the longitudinal direction.
[0033] In a preferred embodiment, such as Figure 7As shown, the friction-enhancing structure consists of tie rods 1.4 that are fixed to the precast pile body 1. Both ends of the tie rods 1.4 protrude from the outer surface of the precast pile body 1. Through holes (not shown) can be pre-drilled or drilled in the precast pile body 1. After the tie rods 1.4 pass through the through holes, they are fixedly connected to the precast pile body 1. The fixing of the tie rods 1.4 is very stable and reliable, and the structure is simple and easy to operate. It can significantly increase the integrity between the grout and the precast pile body 1, preventing the connection between the two from becoming a weak point that can be damaged. The tie rods 1.4 can also be pre-embedded inside the pile body during the precast pile manufacturing process.
[0034] It should be noted that the precast pile body 1 can be made of concrete or steel, is a hollow structure, and can have a circular or polygonal cross-section.
[0035] like Figure 8 , Figure 9 As shown, the construction process of the novel precast pile of this utility model mainly includes the following steps:
[0036] The new precast pile is driven into the soil using pile driving machinery 4. The pile tip plate 2 pushes the soil apart. Due to the effect of the sharp angle 2.1, a pile hole (gap) is formed between the precast pile body 1 and the soil. During the process of forming the pile hole, the grout 5 in the cavity 1.5 of the precast pile body 1 continuously flows from the grouting hole 1.6 into the gap between the precast pile body 1 and the pile hole. When the precast pile reaches the design depth, the grout 5 solidifies and the precast pile construction is completed.
[0037] This construction process does not begin grouting after pile driving is completed, nor does it alternate between pile driving and pressure grouting. Instead, grouting is performed simultaneously during pile driving. Grout 5 provides reverse pressure to the borehole wall soil, preventing stress relaxation and strength reduction. Furthermore, pressure grouting is not required; it relies on pile driving vibration and the gravity flow of the grout, or pressure grouting can be performed using grouting equipment. The inherent repeated vibrations during pile driving allow grout 5 to penetrate into the soil fissures around the pile hole, thereby reinforcing the surrounding soil and further improving soil strength and the bond between grout 5 and the soil.
[0038] The inventors discovered that after construction, the bonding force between the grout 5 and the soil is significantly enhanced in precast piles with a pointed tip plate 2 (2.1°). However, this solidified grout 5 often becomes a weak point for load-bearing failure due to its connection with the surface of the precast pile body 1. Traditional precast piles typically have smooth side surfaces, either formed directly from steel pipes or molded directly from templates used for precast concrete components. Traditional methods primarily improve the load-bearing capacity of precast piles by increasing the end bearing capacity, without requiring special treatment of the side surfaces. This invention overcomes the shortcomings of existing technologies by incorporating a friction-enhancing structure on the outer surface of the precast pile body 1, thus significantly improving the frictional force of the precast pile body.
[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 novel precast pile, characterized in that, It includes a precast pile body (1), a pile tip plate (2), and a pile tip rib plate (3). The pile tip plate (2) is fixed to the lower end of the precast pile body (1), and the pile tip rib plate (3) is fixed below the pile tip plate (2). The pile tip plate (2) has a sharp corner (2.1) protruding from the periphery of the precast pile body (1); the outer surface of the precast pile body (1) is provided with a friction-enhancing structure.
2. The novel precast pile according to claim 1, characterized in that, The precast pile body (1) is a hollow structure with a cavity (1.5) inside. The lower end of the precast pile body (1) has a grouting hole (1.6), which connects the cavity (1.5) and the outer surface of the precast pile body.
3. The novel precast pile according to claim 1, characterized in that, The pile tip rib (3) extends from the center of the pile tip plate (2) to the sharp corner (2.1).
4. A novel precast pile according to claim 3, characterized in that, The outer periphery of the pile tip plate (2) is provided with six sharp corners (2.1) at uniform intervals.
5. A novel precast pile according to claim 1, characterized in that, The pile tip plate (2) is fixedly connected to the precast pile body (1) by fasteners; or the pile tip plate (2) is fixedly connected to the precast pile body (1) by welding.
6. A novel precast pile according to claim 1, characterized in that, The friction enhancement structure is a clamp or transverse rib (1.1) fixed to the outer surface of the precast pile body (1).
7. A novel precast pile according to claim 1, characterized in that, The friction-enhancing structure is a groove and / or protrusion (1.2) formed on the outer surface of the precast pile body (1).
8. A novel precast pile according to claim 1, characterized in that, The friction enhancement structure is a longitudinal rib (1.3) fixed on the outer surface of the precast pile body (1), and the longitudinal rib (1.3) extends along the axial direction of the precast pile body (1).
9. A novel precast pile according to claim 1, characterized in that, The friction enhancement structure is a tie rod (1.4) that is fixed through the precast pile body (1), with both ends of the tie rod (1.4) protruding from the outer surface of the precast pile body (1).