A precast pile

Abstract

A precast pile, characterized in that it includes a first precast pile and a second precast pile, the first and second precast piles having the same structure, both including two reinforcing end frames, and concrete and steel cages poured on the two reinforcing end frames. In this application, the reinforcing end frames are precast at both ends of the precast pile, and the two precast piles are precisely connected by their snap-fit ​​grooves. With the help of snap-fit ​​parts, the piles are embedded into the channel through an interference fit, and are limited by the bottom plate (top surface of the bottom plate) of the snap-fit ​​groove. The interference fit can generate strong friction and mechanical interlocking force between the snap-fit ​​parts and the snap-fit ​​groove, ensuring that the upper and lower precast piles are tightly connected, effectively resisting displacement and deformation caused by various loads, greatly reducing the risk of loosening at the pile connection, and providing a solid guarantee for the safety and reliability of the pile foundation project.

Description

Technical Field

[0001] This application pertains to the field of building construction, specifically to a type of precast pile. Background Technology

[0002] In the field of building foundation engineering, pile foundations, as a crucial structure for bearing the load of buildings, are widely used in various construction projects. Pile foundations transfer the building's load to deep, stable soil or rock layers, and their construction quality directly affects the safety and stability of the overall project. However, in actual construction, pile length is often limited by various factors, such as transportation constraints (difficulty in transporting ultra-long piles), space limitations at the construction site (e.g., the inability to use long pile equipment in narrow spaces), and the requirements of complex geological conditions (e.g., the need to adjust pile length when encountering hard rock or soft soil layers). Therefore, on-site pile splicing technology becomes a key link in solving these problems.

[0003] Currently, common methods for splicing piles mainly include welded splicing and flange bolt splicing. Welded splicing involves fixing two pile sections together by melting metal at high temperatures. Although it is relatively inexpensive, it has significant limitations: First, the welding quality is highly dependent on the operator's skill level, and defects such as uneven welds, porosity, or slag inclusions are prone to occur. Second, welding performance deteriorates significantly in harsh weather conditions (such as rain or low temperatures). Third, the welding process is time-consuming, affecting construction efficiency. Furthermore, welded splicing is an irreversible connection; once completed, it is difficult to adjust or disassemble, hindering later maintenance or modifications.

[0004] Flange bolt connections connect piles using prefabricated flanges and bolts, offering advantages such as high connection strength and detachability. However, this method demands extremely high manufacturing precision from both the flanges and bolts; even slight deviations can lead to loose connections or uneven stress. Furthermore, flange connections require multiple bolts working together, making the construction process cumbersome, especially in complex environments such as deep pits or underwater locations, where the operational difficulty is even greater. In addition, the size and weight of the flanges increase the transportation and lifting costs of the piles.

[0005] In summary, existing pile splicing methods have many problems in practical applications. Therefore, developing a mechanical pile splicing structure and method that can adapt to complex construction environments and ensure efficient and high-precision connections has become a technical challenge that urgently needs to be overcome in this field. Summary of the Invention

[0006] The purpose of this invention is to provide a precast pile that solves the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A precast pile, characterized in that: it includes a first precast pile and a second precast pile, the first precast pile and the second precast pile have the same structure, both including two side reinforcing end frames, and concrete and steel cages poured on the two side reinforcing end frames, the reinforcing end frames including a bottom plate and side walls, the side walls having transverse steel bar through holes and vibration holes, the bottom plate of the upper reinforcing end frame of the second precast pile having a first through hole at the center, the lower part of the first precast pile having a centering round steel pre-embedded, the centering round steel passing through the center of the bottom plate and inserted into the first through hole, and confined in the centering groove; The first and second precast piles are connected by several snap-fit ​​components. The snap-fit ​​components are I-shaped structures. The reinforced end frame is provided with a snap-fit ​​groove. The bottom of the snap-fit ​​groove is provided with a channel for the vertical part of the I-shaped structure to pass through. The width of the channel is adapted to the width of the vertical part and is less than the length of the horizontal part of the I-shaped structure. The upper and lower horizontal parts of the snap-fit ​​components are respectively limited by the vertical part of the snap-fit ​​groove of the upper and lower reinforced end frame passing through the channel, thus connecting the first and second precast piles on both sides.

[0008] More preferably, the reinforced end frame is a square frame structure, and each reinforced end frame has four vibration holes. The four vibration holes are arranged in pairs on the side walls located on opposite sides. Each reinforced end frame has eight transverse steel bar through holes, and two steel bar through holes are provided on one side wall.

[0009] Furthermore, the snap-fit ​​grooves are located at the four corners of the end face of the reinforced end frame, and the channels are located at the four corners of the base plate. The snap-fit ​​grooves are formed by splicing together right-angled notches formed by the two side walls.

[0010] Furthermore, the base plate is also provided with a second through hole. After the connecting pin passes through the second through hole of the first precast pile, it is inserted into the second through hole of the second precast pile and confined within the connecting groove.

[0011] More preferably, the length of the center round steel is the same as the sum of the heights of the two reinforcing end frames, and the length of the connecting pin is longer than the sum of the heights of the two reinforcing end frames.

[0012] A construction method for precast piles, characterized by comprising the following steps: Step S1: Hoist the first precast pile and drive it into the foundation so that the first precast pile protrudes at least 0.3m above the ground; Step S2: Hoist the second precast pile, so that the centering round steel passes through the center of the bottom plate and is inserted into the first through hole, and the connecting pin is inserted into the second through hole, and the snap-fit ​​grooves of the first precast pile and the second precast pile are aligned with the snap-fit ​​grooves. Step S3: Hammer the snap-fit ​​component into the channel along its axial direction until the upper and lower horizontal parts of the snap-fit ​​component are respectively snapped into the snap-fit ​​grooves of the first and second precast piles. After the pile connection is completed, apply anti-corrosion coating to the joint. Step S4: Continue driving in the second precast pile until its head emerges from the ground. At this point, the second precast pile becomes the new first precast pile. Step S5: Repeat steps S2 to S4, connecting the piles section by section to the design height.

[0013] Compared with the prior art, the present invention has the following features and beneficial effects: This application involves prefabricating reinforced end frames at both ends of precast piles, precisely connecting the two precast piles using their interlocking slots, and embedding them into the channel via an interference fit with interlocking components. The interlocking slot bottom plate (top surface of the bottom plate) provides limiting. This interference fit generates strong friction and mechanical interlocking force between the interlocking components and the interlocking slot, ensuring a tight connection between the upper and lower precast piles. This effectively resists displacement and deformation under various loads, significantly reducing the risk of loosening at the pile connection and providing a solid guarantee for the safety and reliability of the pile foundation project.

[0014] The first and second precast piles can be precast in advance. During on-site construction, the first and second precast piles only need to be aligned, and the snap-fit ​​slots of the upper and lower precast piles are aligned with each other before the snap-fit ​​parts are inserted to complete the pile splicing. Compared with the traditional pile splicing process, this simplifies the operation process, significantly improves construction efficiency, reduces the requirements for the professional skills of construction personnel, effectively shortens the construction period, and saves construction costs.

[0015] The snap-fit ​​connector, as an independent movable component, uses a plug-in design with the snap-fit ​​channel, giving the pile joint structure excellent detachability. In scenarios involving pile foundation inspection, subsequent maintenance, or engineering modifications, the snap-fit ​​connector can be easily removed without damaging the main structure of the precast pile. This feature not only facilitates the inspection and repair of the pile foundation's interior but also provides technical feasibility for the dynamic adjustment of the engineering structure, effectively enhancing the full lifecycle management capabilities of pile foundation projects. Attached Figure Description

[0016] Figure 1 The diagram shows the connection of the reinforced end frame involved in the application; Figure 2 This is a diagram illustrating the connection of the card connector involved in this application; Figure 3 This is a schematic diagram of the base plate structure involved in this application; Figure 4 This is a schematic diagram of the channel and card slot structure involved in this application; Figure 5 This is a diagram illustrating the connection between the first and second precast piles involved in this application.

[0017] Reference numerals in the attached drawings: 1-First precast pile; 2-Second precast pile; 3-Reinforced end frame; 31-Bottom plate; 32-Side wall; 33-Through hole for transverse reinforcement; 34-Vibration hole; 35-First through hole; 36-Second through hole; 37-Connecting pin; 38-Connecting groove; 39-Centering groove; 4-Snap-fit ​​piece; 5-Snap-fit ​​groove; 6-Channel; 7-Centering round steel. Detailed Implementation

[0018] To make the technical means, innovative features, objectives and effects of this invention easier to understand, the invention will be further described below.

[0019] The embodiments described herein are specific implementations of the present invention, used to illustrate the concept of the invention, and are illustrative and exemplary, and should not be construed as limiting the implementation or scope of the invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include those that make any obvious substitutions and modifications to the embodiments described herein.

[0020] Example 1 A precast pile includes a first precast pile 1 and a second precast pile 2. The first precast pile 1 and the second precast pile 2 have the same structure, both including two reinforcing end frames 3 on both sides, and concrete and steel cages poured on the two reinforcing end frames 3. The reinforcing end frame 3 includes a bottom plate 31 and a side wall 32. The side wall 32 is provided with transverse steel bar through holes 33 and vibration holes 34. The bottom plate 31 of the reinforcing end frame 3 above the second precast pile 2 is provided with a first through hole 35. A centering round steel 7 is pre-embedded in the lower part of the first precast pile 1. The centering round steel 7 passes through the center of the bottom plate 31 and is inserted into the first through hole 35 and is limited to the centering groove 39. The centering round steel 7 is used for centering and improving the bearing capacity and deformation resistance of the pile body. The first precast pile 1 and the second precast pile 2 are connected by several snap-fit ​​pieces 4. The snap-fit ​​pieces 4 are I-shaped or H-shaped structures, and are integral structures made of rigid alloy material. The reinforced end frame 3 is provided with snap-fit ​​grooves 5. The bottom of the snap-fit ​​groove 5 is provided with a channel 6 for the vertical part of the I-shaped structure to pass through. The width of the channel 6 is adapted to the width of the vertical part and is less than the length of the horizontal part of the I-shaped structure. The upper and lower horizontal parts of the snap-fit ​​pieces 4 are respectively limited in the snap-fit ​​grooves 5 of the upper and lower reinforced end frames 3. The vertical part passes through the channel 6 to connect the first precast pile 1 and the second precast pile 2 on both sides.

[0021] Example 2 Based on Embodiment 1, the reinforced end frame 3 is a square frame structure, welded together from four side plates and a bottom plate. Each reinforced end frame 3 has four vibration holes 34, which are arranged in pairs on the opposite side walls 32. Each reinforced end frame 3 has eight transverse rebar through holes 33, with two rebar through holes 33 on each side wall 32. The snap-fit ​​grooves 5 are located at the four corners of the end face of the reinforced end frame 3, and the channels 6 are located at the four right-angle corners of the bottom plate 31. The snap-fit ​​grooves 5 are formed by joining the right-angle notches formed by the two side walls 32.

[0022] During concrete pouring, the transverse reinforcement holes 33 play a dual important role. First, they allow air to escape during the pouring process, preventing air bubbles from forming inside the concrete and ensuring the density and strength of the pile concrete. Second, during construction, the transverse reinforcements can be inserted into the symmetrically arranged transverse reinforcement holes 33, enhancing the connection between the pile and the reinforced end frame 3 during concrete pouring. A concrete vibrator can be inserted into the pile through the vibration holes 34 to vibrate the concrete, ensuring thorough compaction, eliminating internal voids, and further improving the pile quality.

[0023] The base plate 31 is also provided with a second through hole 36. After the connecting pin 37 passes through the second through hole 36 of the first precast pile 1, it is inserted into the second through hole 36 of the second precast pile 2 and is limited to the connecting groove 38. The connecting groove and the centering groove are reserved by the template when pouring concrete. The connecting groove and the centering groove are respectively set with the connecting pin and the centering round steel. The four second through holes 36 are arranged symmetrically outside the first through hole 35. The length of the centering round steel 7 is the same as the sum of the heights of the two reinforcing end frames 3. The length of the connecting pin 37 is longer than the sum of the heights of the two reinforcing end frames 3.

[0024] The reinforcing cage is fixed inside the precast pile by concrete pouring, further enhancing the connection strength between the reinforced end plate and the precast pile, as well as the structural strength of the pile itself. When the pile is subjected to external forces, the reinforcing cage, together with the centering steel, connecting pins, and concrete, can jointly resist tensile, compressive, and bending moments, further improving the mechanical properties of the pile splice structure. Example 3 A construction method for precast piles, characterized by comprising the following steps: Step S1: Hoist the first precast pile and drive it into the foundation so that the first precast pile protrudes at least 0.3m above the ground; Step S2: Hoist the second precast pile, so that the centering round steel passes through the center of the bottom plate and is inserted into the first through hole, and the connecting pin is inserted into the second through hole, and the snap-fit ​​grooves of the first precast pile and the second precast pile are aligned with the snap-fit ​​grooves. Step S3: Hammer the snap-fit ​​component into the channel along its axial direction until the upper and lower horizontal parts of the snap-fit ​​component are respectively snapped into the snap-fit ​​grooves of the first and second precast piles. After the pile connection is completed, apply anti-corrosion coating to the joint. Step S4: Continue driving in the second precast pile until its head emerges from the ground. At this point, the second precast pile becomes the new first precast pile. Step S5: Repeat steps S2 to S4, connecting the piles section by section to the design height.

[0025] Example 4 Based on Embodiment 1, the base plate of the reinforced end frame is a high-strength steel plate of 395mm×395mm×12mm. The side walls are formed by welding two 395mm×240mm×12mm and two 370mm×240mm×12mm high-strength steel plates into a ring-shaped reinforcing unit. The ring-shaped reinforcing unit is welded and fixed to the base plate and covers the outer wall of the precast pile end. The ring-shaped reinforcing unit is formed by welding high-strength steel plates, and the welding method ensures the firmness of the connection between the steel plates, forming an integral reinforced structure. It covers the outer wall of the first precast pile and is welded to the base plate, which can enhance the bending and shear resistance of the pile end. When the pile is subjected to external forces, the ring-shaped reinforcing unit can restrain the deformation of the pile concrete, improve the bearing capacity and stability of the pile end, and reduce the possibility of pile end failure.

[0026] In this embodiment, the specific pile connection steps are as follows: Step S1: Hoist the first precast pile. The pile driver will drive the first precast pile into the foundation. During the driving process, monitor the verticality of the pile in real time to ensure that the deviation does not exceed the specification requirements. Continue driving until the reinforced end frame protrudes from the ground to a certain height. This height should be sufficient to facilitate subsequent operations and the installation of the snap-fit ​​unit, providing operating space for subsequent pile splicing operations. Step S2: Use lifting equipment to hoist the second precast pile above the first precast pile and lower it slowly. At the same time, arrange professional personnel to accurately align the snap-fit ​​groove of the reinforced end plate through measuring instruments and visual observation to ensure that the snap-fit ​​groove and the snap-fit ​​channel correspond accurately to form a complete snap-fit ​​channel, laying the foundation for the smooth installation of the snap-fit ​​component. Step S3: Before hammering the snap-fit ​​component, carefully clean the dirt, gravel, and other debris from the snap-fit ​​channel using a high-pressure air gun or a special cleaning tool to ensure the inner wall of the channel is clean and free of foreign objects. Then, use a hammering tool to slowly hammer the snap-fit ​​component into the snap-fit ​​channel along its axial direction, continuously applying pressure until the snap-fit ​​component is fully engaged in the snap-fit ​​groove, thus achieving a firm connection between the upper and lower reinforced end frames.

[0027] Step S4: After the snap-fit ​​connector is installed, restart the pile driver to continue driving the second precast pile into the foundation soil. During the driving process, closely monitor the settlement and verticality changes of the pile to ensure the accurate driving direction of the second precast pile. When the second precast pile is driven to a certain height above the ground, stop the driving operation. At this point, the second precast pile becomes the new first precast pile, preparing for the next pile splicing.

[0028] Step S5: Repeat steps S2 to S4, following the above process to hoist, align, clamp, and drive in the subsequent precast piles, completing the pile splicing operation section by section until the entire pile reaches the design-specified height. Throughout the entire pile splicing process, after each section is completed, a comprehensive inspection of the pile's verticality and clamping quality must be conducted to ensure that the spliced ​​structure meets design and specification requirements.

[0029] In this embodiment, the surfaces of the first precast pile, the second precast pile, and the snap-fit ​​component are all coated with a rust-proof and corrosion-proof coating. This coating can effectively isolate air and moisture, prevent the pile connection structure from rusting during use, and ensure the durability of the pile connection structure.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precast pile, characterized in that: The first precast pile (1) and the second precast pile (2) are identical in structure, each including a reinforced end frame (3) on both sides, as well as concrete and steel cages poured on the reinforced end frames (3). The reinforced end frame (3) includes a bottom plate (31) and a side wall (32). The side wall (32) is provided with transverse steel bar through holes (33) and vibration holes (34). The bottom plate (31) of the reinforced end frame (3) above the second precast pile (2) is provided with a first through hole (35). The lower part of the first precast pile (1) is pre-embedded with a centering round steel (7). The centering round steel (7) passes through the center of the bottom plate (31) and is inserted into the first through hole (35) and limited to the centering groove (39). The first precast pile (1) and the second precast pile (2) are connected by several snap-fit ​​pieces (4). The snap-fit ​​pieces (4) are I-shaped structures. The reinforced end frame (3) is provided with a snap-fit ​​groove (5). The bottom of the snap-fit ​​groove (5) is provided with a channel (6) for the vertical part of the I-shaped structure to pass through. The width of the channel (6) is adapted to the width of the vertical part and is less than the length of the horizontal part of the I-shaped structure. The upper and lower horizontal parts of the snap-fit ​​pieces (4) are respectively limited in the snap-fit ​​groove (5) of the upper and lower reinforced end frame (3). The vertical part passes through the channel (6) to connect the first precast pile (1) and the second precast pile (2) on both sides.

2. A precast pile as described in claim 1, characterized in that: The reinforced end frame (3) is a square frame structure. Each reinforced end frame (3) is provided with four vibration holes (34). The four vibration holes (34) are combined in pairs on the side wall (32) located on opposite sides. Each reinforced end frame (3) is provided with eight transverse steel bar through holes (33). Two steel bar through holes (33) are provided on one side wall (32).

3. A precast pile as claimed in claim 2 wherein: The snap-fit ​​groove (5) is located at the four corners of the end face of the reinforced end frame (3), and the channel (6) is located at the four corners of the base plate (31). The snap-fit ​​groove (5) is formed by splicing the right-angle missing corners formed by the two side walls (32).

4. A precast pile as claimed in claim 1 wherein: The base plate (31) is also provided with a second through hole (36). After the connecting pin (37) passes through the second through hole (36) of the first precast pile (1), it is inserted into the second through hole (36) of the second precast pile (2) and is limited to the connecting groove (38).

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