Precast pile and precast pile assembly

Abstract

A precast pile and a precast pile assembly, the precast pile comprising a pile body and a first annular end plate connected to one end of the pile body; wherein the first annular end plate is spaced apart in the circumferential direction away from the pile body and is provided with two or more first dovetail grooves, and the direction of the line from the center of the first annular end plate to one end of the first dovetail groove forms an oblique angle a with the length extension direction of the first dovetail groove. The precast pile provided by the application is provided with oblique first dovetail grooves at one end, thereby facilitating the quick and firm oblique installation of the excavating plate steel cutter, the excavating plate steel cutter obliquely installed through the first dovetail groove can withstand greater torque and shear force relative to welding during pile planting, and the excavating plate steel cutter can better discharge the cut and crushed soil and / or broken stones to the inner hole of the pile body or the outside of the pile during the rotation of the pile body, thereby facilitating the sinking of the pile to the predetermined elevation and ensuring the quality of the pile foundation engineering.

Description

Technical Field

[0001] This application relates to the field of pile foundation construction technology, specifically to a precast pile and a precast pile assembly. Background Technology

[0002] In the field of construction engineering, precast piles, as core components in foundation construction, are widely used in the foundation construction of buildings, bridges, docks, and other projects. The pile driving stage is a key step in the precast pile embedding method. The embedding method requires welding a tunneling steel plate to the bottom of the next precast pile section, and then using the rotation of the pile body to assist in sinking. By actively applying an external force exceeding the friction between the pile and the soil, the problem of the pile body failing to reach the design depth due to significantly increased resistance in the later stages of penetration is effectively solved, providing an important guarantee for the successful completion of the embedding method.

[0003] In existing technologies, precast piles require welding to fix a special rotary drilling steel plate to the end plate of the prestressed concrete pile. The quality of the welded joint directly becomes the weakest link in the entire force transmission chain. In the complex actual construction environment, welding quality is affected by multiple factors such as worker skill level, working environment, and the rigor of quality control, resulting in significant uncertainty. If the weld strength is insufficient or defects such as incomplete or false welds exist, the welded area will be subjected to enormous rotational torque and downward pressure when encountering hard soil or rock layers. The drilling steel plate is prone to detachment, which will not only cause the pile driving operation to be interrupted immediately, but also prevent the pile from being driven into place. Furthermore, welding requires cooling time, resulting in a slow construction pace and low efficiency. Utility Model Content

[0004] The purpose of this application is to provide a precast pile and a precast pile assembly to solve the welding defects problem of the excavated steel plate in the pile driving method.

[0005] To achieve the objectives of this application, the following technical solution is provided:

[0006] In a first aspect, the present invention provides a precast pile, which includes: a pile body and a first annular end plate connected to one end of the pile body; wherein, the first annular end plate has two or more first dovetail grooves spaced apart circumferentially opposite to the pile body, and the direction of the line connecting the center of the first annular end plate to one end of the first dovetail groove forms an inclined angle α with the length extension direction of the first dovetail groove.

[0007] In the precast pile provided by this utility model, the first annular end plate has a first end face facing away from the pile body, and the opening of the first dovetail groove is located on the first end face.

[0008] And / or, the pile body comprises two or more precast pile segments that are axially joined.

[0009] In the precast piles provided by this utility model, the included angle α is 15° to 60°.

[0010] In the precast pile provided by this utility model, the first annular end plate is provided with a plurality of first anchoring holes, and each first dovetail groove is provided between two adjacent first anchoring holes.

[0011] The depth of the first dovetail groove in the length direction of the pile body is less than the thickness of the first annular end plate.

[0012] In the precast pile provided by this utility model, there are multiple first dovetail grooves, and the multiple first dovetail grooves are distributed circumferentially at intervals on the first outer peripheral wall of the first annular end plate, and the extension directions of two adjacent first dovetail grooves are perpendicular to each other.

[0013] The precast pile provided by this utility model also includes a second annular end plate connected to the other end of the pile body. The second annular end plate has two or more second dovetail grooves spaced apart around the pile body, and the two or more second dovetail grooves are radially distributed.

[0014] The second annular end plate has a second end face facing away from the pile body, and the opening of the second dovetail groove is located on the second end face.

[0015] In the precast pile provided by this utility model, the depth of the second dovetail groove in the length direction of the pile body is less than the thickness of the second annular end plate.

[0016] And / or, each of the second dovetail grooves is circumferentially equidistantly distributed on the second outer peripheral wall of the second annular end plate and is flush with the length of the pile.

[0017] Secondly, this utility model also provides a precast pile assembly, including a steel blade and a precast pile as described in any of the various embodiments of the first aspect, wherein the steel blade is provided with a first dovetail block, the first dovetail block is engaged and adapted with the first dovetail groove, and the length of the first dovetail block is less than the length of the steel blade.

[0018] In the precast pile assembly provided by this utility model, the first dovetail block is connected to one end of the steel blade along the axial direction of the pile body, and the other end of the steel blade along the axial direction of the pile body is provided with a cutting edge, the wall thickness of the cutting edge gradually decreasing from the end close to the first dovetail block to the end away from the first dovetail block.

[0019] The precast pile assembly provided by this utility model also includes a pile driving connecting strip. The precast pile includes a second annular end plate connected to the other end of the pile body. The second annular end plate has two or more second dovetail grooves spaced apart around the pile body, and the two or more second dovetail grooves are radially distributed.

[0020] The pile driving connecting strip has a second dovetail block that is adapted to engage with the second dovetail groove, and the length of the second dovetail block is less than the length of the pile driving connecting strip.

[0021] Compared with the prior art, this application has at least the following beneficial effects:

[0022] 1. The precast pile provided in this application has an inclined first dovetail groove at one end, which facilitates the quick and secure oblique installation of the steel blade plate. The steel blade plate installed obliquely through the first dovetail groove can withstand greater torque and shear force than welding during the pile driving process. During the rotation of the pile body, the steel blade plate can better discharge the cut and broken soil and / or gravel to the inner hole of the pile body or the outside of the pile, which facilitates the pile driving to the predetermined elevation and ensures the quality of the pile foundation project.

[0023] 2. The precast pile provided in this application has a second dovetail groove arranged radially at the other end. The second dovetail groove facilitates the connection between precast pile segments using double dovetail pins. Furthermore, for the top end or the uppermost precast pile segment, the pile driving connecting strip can be quickly and firmly installed through the second dovetail groove. This detachable installation method of the pile driving connecting strip facilitates repeated recycling, reducing the cost of a single construction and the amount of metal materials used.

[0024] 3. The precast pile assembly provided in this application has a steel blade plate installed at one end through a dovetail connection structure, and a pile driving connecting strip installed at the other end through a dovetail connection structure. This structure enables the two ends of the precast pile to be quickly and firmly connected to the pile driving connecting strip and the steel blade plate, improving construction efficiency while effectively avoiding the problem of insufficient strength in traditional welding. It can withstand greater torque, shear force and tensile stress, avoiding the dangerous situation of breakage and detachment caused by unreliable connection between the top of the precast column and the pile driving rod, and reducing the risk of safety accidents. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a perspective view of a precast pile according to one embodiment of this application;

[0027] Figure 2 This is a perspective view of a first annular end plate according to one embodiment of this application;

[0028] Figure 3 This is a bottom view of the first annular end plate according to one embodiment of this application;

[0029] Figure 4 This is a perspective view of the second annular end plate according to one embodiment of this application;

[0030] Figure 5 This is a perspective view of a precast pile assembly according to one embodiment of this application;

[0031] Figure 6 This is a perspective view of a steel blade plate according to one embodiment of this application;

[0032] Figure 7 This is an exploded view of the second annular end plate and the pile driving connecting strip according to one embodiment of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100. Pile body; 200. First annular end plate; 210. First outer peripheral wall; 220. First dovetail groove; 230. First end face; 240. First anchor hole; 300. Second annular end plate; 310. Second dovetail groove; 320. Second anchor hole; 330. Second end face; 340. Second outer peripheral wall; 400. Steel blade; 410. First dovetail block; 420. Blade; 500. Pile driving connecting strip; 510. Second dovetail block. Detailed Implementation

[0035] The following are specific embodiments of this application, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of this application. However, this application is not limited to these embodiments.

[0036] refer to Figures 1-4 The precast pile provided in this application includes a pile body 100 and a first annular end plate 200. The pile body 100 is preferably a single-piece reinforced concrete structure in the shape of a long tubular strip. Its cross-sectional shape can be circular, polygonal, or a non-circular pile with varying cross-sectional shape along its length. It can also be a hollow or solid structure depending on the actual engineering requirements. The first annular end plate 200 is connected to one end of the pile body 100 in the circumferential direction, and the outer contour of the cross-section of the first annular end plate 200 is consistent with the outer contour of the cross-section of the pile body. Of course, in the precast pile provided by this utility model, the pile body 100 can also be a steel pipe pile or a steel-concrete composite pile. The pile body 100 can also include two or more axially joined precast pile segments. The precast pile segments can be joined axially in the factory or on the construction site using methods such as welding or mechanical joints to form a robust and reliable overall load-bearing structure.

[0037] like Figure 1 and Figure 2 As shown, in this embodiment, the first annular end plate 200 has two or more first dovetail grooves 220 spaced apart circumferentially opposite to the pile body 100. Specifically, the first annular end plate 200 has a first end face 230 opposite to the pile body 100, and the opening of the first dovetail groove 220 is located on the first end face 230. The groove depth of the first dovetail groove 220 in the length direction of the pile body 100 is less than the thickness of the first annular end plate 200, preferably the groove depth of the first dovetail groove 220 is greater than half the thickness of the first annular end plate 200. The shape and size design of the first dovetail groove 220 can facilitate the snap-fit ​​assembly of external components and ensure reliable stress, such as the double dovetail pin for pile connection or such as Figure 6 The steel blade plate shown is 400mm. The dovetail structure, compared to on-site welding, ensures improved connection strength and reliability, and avoids the problems of uncertain quality leading to detachment and slow welding time, thus ensuring the quality and efficiency of rotary pile driving.

[0038] like Figure 3 and Figure 5 As shown, the line connecting the center of the first annular end plate 200 to one end of the first dovetail groove 220 forms an inclined angle α with the length extension direction of the first dovetail groove 220. Furthermore, the inclination direction of each first dovetail groove 220 is the same, i.e., all are counterclockwise or all are clockwise. In this embodiment, the angle α is preferably 15° to 60°. This inclination angle design allows the first dovetail groove 220 to be used for snap-fit ​​assembly, such as... Figure 6 When the steel blade plate shown is 400, the tilt angle design facilitates the rotation of the pile body. When the pile body is 100, the tunneling effect or slag removal effect is better.

[0039] Preferred, such as Figure 2 and Figure 3 As shown, there are multiple (more than three) first dovetail grooves 220, which are circumferentially spaced on the first outer peripheral wall 210 of the first annular end plate 200, and the extending directions of two adjacent first dovetail grooves 220 are perpendicular. The first annular end plate 200 is provided with multiple first anchoring holes 240, and each first dovetail groove 220 is located between two adjacent first anchoring holes 240; this structural design allows external components (such as...) to... Figure 6 The steel blade plate 400 shown is uniformly stressed along the circumference of the first annular end plate 200, and avoids interfering with the connection and prestressing tension of the reinforcing cage and the first anchor hole 240.

[0040] like Figure 4 and Figure 5As shown, in this embodiment, the precast pile also includes a second annular end plate 300 connected to the other end of the pile body 100. The second annular end plate 300 has a second end face 330 facing away from the pile body 100. Both the first annular end plate 200 and the second annular end plate 300 are made of metal, and the first annular end plate 200 and the second annular end plate 300 are aligned along the length of the pile body 100. This material and structural design facilitates the application of prestress to the pile body 100 during manufacturing and the use of welding or mechanical connection for pile splicing, as well as preventing damage to the pile end during transportation and construction.

[0041] like Figure 4 and Figure 5 As shown, in this embodiment, the second annular end plate 300 has two or more second dovetail grooves 310 spaced apart circumferentially opposite the pile body 100. The second dovetail grooves 310 are arranged radially. The opening of the second dovetail groove 310 is located on the second end face 330. This structural design facilitates the connection between precast pile segments using double dovetail pins.

[0042] like Figure 5 and Figure 7 As shown, for the top end or uppermost precast pile segment of pile body 100, the second dovetail groove 310 is used for quick and secure installation. Figure 7 The pile driving connecting strip 500 shown is detachable and reusable, reducing the cost per construction session and the amount of metal materials used. However, after pile driving is completed, the removal of the device is not convenient. The pile driving connecting strip 500, welded to the second annular end plate 300, is buried underground. For construction requirements that necessitate restoring the pile top to its normal state for connection with the superstructure, additional excavation is required to locate and remove these connecting strips 500. This process again consumes significant manpower and requires specialized cutting equipment, significantly increasing the overall cost of the entire construction cycle.

[0043] like Figure 7 As shown, in this embodiment, the depth of the second dovetail groove 310 along the length of the pile body 100 is less than the thickness of the second annular end plate 300, and preferably the second dovetail groove 310 is greater than half the thickness of the second annular end plate 300. This dimensional design fully ensures the tensile, compressive, shear, and high-torque mechanical properties of the dovetail connection structure, avoiding the risk of the pile connecting strip 500 falling off due to weak and unreliable stress under welding processes. It also prevents the pile driving operation from being interrupted or even more seriously caused by the precast pile falling uncontrollably into the hole, leading to major quality and safety accidents such as pile damage, hole wall collapse, and even personal injury.

[0044] like Figures 5 to 7As shown, to facilitate the connection of precast column segments or the connection of pile driving rods (not shown in the diagram) at the top of the pile body 100, each second dovetail groove 310 is circumferentially equidistantly distributed on the second outer peripheral wall 340 of the second annular end plate 300 and flush with the length of the pile body 100. Furthermore, in this embodiment, the first dovetail groove 220 and the second dovetail groove 310 generally refer to various groove types with a groove opening width smaller than the maximum width of the groove cavity; specific shapes can be T-shaped dovetails, figure-eight shaped dovetails, round-headed dovetails, etc.

[0045] The second annular end plate 300 is provided with a plurality of second anchoring holes 320, and each second dovetail groove 310 is provided between two adjacent second anchoring holes 320; this structural design enables external components (such as...) Figure 7 The pile driving connecting strip 500 shown is uniformly stressed along the circumference of the second annular end plate 300, and avoids interfering with the connection of the steel cage and the second anchor hole 320 and the prestressing tension.

[0046] like Figure 5 and Figure 6 As shown, this embodiment also provides a precast pile assembly, which includes two or more steel blades 400, each of which is located on the same side of the first annular end plate 200. The length of the steel blade 400 (the dimension perpendicular to the axis of the pile body 100 in the working state) is greater than the wall thickness of the pile body 100. The steel blade 400 is provided with a first dovetail block 410, which is engaged and matched with the first dovetail groove 220. The length of the first dovetail block 410 is approximately equal to the length of the first dovetail groove 220, and the length of the first dovetail block 410 is less than the length of the steel blade 400. This structural design allows the steel blade 400 to extend outward from the side wall of the pile body 100 after it is assembled and fixed with the first annular end plate 200. This ensures that when rotating, the excavation hole diameter of the steel blade 400 is greater than the outer diameter or circumscribed circle diameter of the rotating part, thereby fully guaranteeing the excavation effect, ensuring that the pile body 100 is planted in place, and avoiding the problem of high-position piles.

[0047] like Figure 6 As shown, in this preferred embodiment, the first dovetail block 410 is connected to one end of the steel blade 400 along the axial direction of the pile body 100. The other end of the steel blade 400 along the axial direction of the pile body 100 is provided with a cutting edge 420. The wall thickness of the cutting edge 420 gradually decreases from the end near the first dovetail block to the end away from the first dovetail block. This design allows the steel blade 400 to better cut into the soil, reduce resistance, and improve construction efficiency when the pile body 100 is rotated for pile driving.

[0048] like Figure 5 and Figure 7As shown, the system also includes several pile-driving connecting strips 500. The number of pile-driving connecting strips 500 is preferably the same as the number of second dovetail grooves 310 on the second annular end plate 300. Each pile-driving connecting strip 500 has a second dovetail block 510 that engages with the second dovetail groove 310. The length of the second dovetail block 510 is less than the length of the pile-driving connecting strip 500, and the length of the second dovetail block 510 is approximately equal to the length of the second dovetail groove 310. With this design, when the second dovetail block 510 is inserted into the second dovetail groove 310, a portion of the pile-driving connecting strip 500 protrudes radially outward from the outer peripheral wall of the second annular end plate 300, facilitating docking with the pile-driving rod for rotary pile driving construction, resulting in convenient and efficient construction operations.

[0049] To facilitate smooth insertion, the first dovetail groove 220 and / or the second dovetail block 510 may also be wedge-shaped or chamfered at the front end in the insertion direction.

[0050] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application 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.

[0051] Furthermore, the use of terms such as "first," "second," and "a" in this application 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 application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" 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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] Furthermore, the technical solutions of the various embodiments of this application 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 application.

Claims

1. A precast pile, characterized in that, include: The pile body (100) and a first annular end plate (200) connected to one end of the pile body (100); The first annular end plate (200) has two or more first dovetail grooves (220) spaced apart circumferentially opposite the pile body (100). The line connecting the center of the first annular end plate (200) to one end of the first dovetail groove (220) forms an inclined angle α with the length extension direction of the first dovetail groove (220).

2. The precast pile according to claim 1, characterized in that, The first annular end plate (200) has a first end face (230) facing away from the pile body (100), and the opening of the first dovetail groove (220) is located on the first end face (230); And / or, the pile body (100) comprises two or more precast pile segments that are axially joined.

3. The precast pile according to claim 1 or 2, characterized in that, The included angle α is 15° to 60°.

4. The precast pile according to any one of claims 1 or 2, characterized in that, The first annular end plate (200) is provided with a plurality of first anchoring holes (240), and each first dovetail groove (220) is provided between two adjacent first anchoring holes (240); The depth of the first dovetail groove (220) in the length direction of the pile body (100) is less than the thickness of the first annular end plate (200).

5. The precast pile according to claim 1 or 2, characterized in that, The first dovetail groove (220) is provided in multiple ways. The multiple first dovetail grooves (220) are distributed circumferentially on the first outer peripheral wall (210) of the first annular end plate (200), and the extension directions of two adjacent first dovetail grooves (220) are perpendicular to each other.

6. The precast pile according to claim 1, characterized in that, It also includes a second annular end plate (300) connected to the other end of the pile body (100). The second annular end plate (300) has two or more second dovetail grooves (310) spaced apart circumferentially opposite to the pile body (100), and the two or more second dovetail grooves (310) are radially distributed. The second annular end plate (300) has a second end face (330) facing away from the pile body (100), and the opening of the second dovetail groove (310) is located on the second end face (330).

7. The precast pile according to claim 6, characterized in that, The depth of the second dovetail groove (310) in the length direction of the pile body (100) is less than the thickness of the second annular end plate (300); And / or, each of the second dovetail grooves (310) is circumferentially equidistantly distributed on the second outer peripheral wall (340) of the second annular end plate (300) and flush with the length of the pile body (100).

8. A precast pile assembly, characterized in that, The device includes a steel blade (400) and a precast pile according to any one of claims 1-7. The steel blade (400) is provided with a first dovetail block (410), which is engaged and adapted to the first dovetail groove (220). The length of the first dovetail block (410) is less than the length of the steel blade (400).

9. The precast pile assembly according to claim 8, characterized in that, Along the axial direction of the pile body (100), the first dovetail block (410) is connected to one end of the steel blade (400) along the axial direction of the pile body (100), and the other end of the steel blade (400) along the axial direction of the pile body (100) is provided with a cutting edge (420), and the wall thickness of the cutting edge (420) gradually decreases from the end near the first dovetail block (410) to the end away from the first dovetail block (410).

10. The precast pile assembly according to claim 8, characterized in that, It also includes a pile driving connecting strip (500), the precast pile includes a second annular end plate (300) connected to the other end of the pile body (100), the second annular end plate (300) has two or more second dovetail grooves (310) spaced apart in the circumferential direction opposite to the pile body (100), and the two or more second dovetail grooves (310) are radially distributed; The pile driving connecting strip (500) has a second dovetail block (510) that is adapted to engage with the second dovetail groove (310), and the length of the second dovetail block (510) is less than the length of the pile driving connecting strip (500).

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