Rotary pile delivery conversion connecting device and precast pile with variable diameter structure

Abstract

The utility model provides a kind of rotary pile delivery conversion connecting device and prefabricated pile with reducing structure belong to building engineering pile foundation construction technical field, include: connecting column;Bottom plate is fixedly connected with the bottom of connecting column, the outer diameter of bottom plate is greater than the outer diameter of connecting column, bottom plate is concentrically arranged with connecting column;Torsion transmission member is set as the structure that is locked with connecting column circumferentially by being connected with pile cap;The beneficial effects of the utility model are that: the present connecting device can be installed to the top end of tubular pile, and the outer diameter of connecting column is less than the outer diameter of tubular pile, so that reducing structure is formed at the connection of both, so that pile cap only needs to match the outer diameter of connecting device, and then the size of pile cap is greatly reduced, to ensure that the outer diameter of pile cap is less than the caliber of clamp, when rotary pile delivery operation, as tubular pile drops, pile cap can smoothly pass through clamp, greatly improve the construction efficiency of rotary pile delivery.

Description

Technical Field

[0001] This utility model belongs to the field of building foundation construction technology, and relates to a rotary pile feeding conversion connection device and a precast pile with a variable diameter structure. Background Technology

[0002] In the field of construction engineering, pile foundation construction is a core link in infrastructure construction, and its efficiency and quality directly affect the overall benefits of the project. When driving piles through layers of pebbles, gravel, or strongly weathered rock, if a vibratory hammer is used to assist in pile driving, a dense and compacted layer of rock around the pile is easily formed, which increases the subsequent static pressure resistance. In other words, the pure static pressure process is prone to pile driving stagnation because it lacks the dynamic energy to break through the hardened layer on the rock surface.

[0003] Therefore, when planting piles through layers of pebbles, gravel, or strongly weathered rock, rotary pile driving is commonly used. Rotary pile driving utilizes its own rotational cutting action to break up shallow gravel or hard interlayers, reducing the resistance to pile settlement. Simply put, rotary pile driving is a method of planting precast piles by applying a huge rotational torque and downward pressure to them, enabling them to be driven into the soil.

[0004] like Figure 4 Currently, when constructing piles in pebble, gravel, or strongly weathered rock layers, integrated drilling and pile-planting machines are typically used for both pile planting and drilling operations. These integrated machines combine the two key construction processes of drilling and pile planting onto a single mobile piece of machinery, achieving high-efficiency construction. The integrated machine uses specialized clamps to hold the pile body, while the drill rod on the machine connects to the top of the precast pile via a pile cap, driving the precast pile to rotate and be implanted. During the rotational pile planting process, the clamps release the precast pile body at appropriate times, allowing the drill rod to drive the precast pile downwards into the pebble, gravel, or strongly weathered rock layer while rotating. As the precast pile descends, the pile top and pile cap need to pass through the area between the clamps.

[0005] Since the size of the pile cap needs to match the size of the top of the precast pile, the outer diameter of the pile cap must be larger than the outer diameter of the precast pile. However, the opening range of the clamp is limited. This means that in some cases, even if the clamp is fully opened, the diameter of the clamp is still smaller than the outer diameter of the pile cap. As a result, the pile cap at the top of the precast pile cannot pass through the clamp during the descent of the precast pile. This problem can only be solved through a complicated process, such as lowering the precast pile below the clamp before fitting the pile cap, which seriously affects the construction efficiency. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a rotary pile feeding conversion connection device and a precast pile with a variable diameter structure.

[0007] The objective of this utility model can be achieved through the following technical solution: a rotary pile driving conversion connection device, comprising:

[0008] Connecting column;

[0009] The base plate is fixedly connected to the bottom of the connecting column. The outer diameter of the base plate is larger than the outer diameter of the connecting column. The base plate and the connecting column are concentrically arranged. The part of the base plate surrounding the connecting column is set as an annular flange for axially connecting the precast pile body. The annular flange is provided with a plurality of connecting holes arranged in a ring.

[0010] A torque transmitter is fixedly disposed on the top of the connecting column, and the torque transmitter is configured to lock the pile cap circumferentially to the connecting column by engaging with the pile cap.

[0011] Preferably, the connecting post is provided with a central through hole;

[0012] And / or, the outer diameter of the base plate is less than or equal to the outer diameter of the precast pile body;

[0013] And / or, the diameter of the outer contour circle of the torque transmission element rotating about the axis of the connecting column is less than or equal to the outer diameter of the base plate.

[0014] Preferably, the torque transmission component is configured as at least two circumferential locking blocks, which are welded to the top or end circumferential surface of the connecting column.

[0015] Preferably, the circumferential locking block protrudes radially from the outer edge of the top surface of the connecting post, and the number of the circumferential locking blocks is at least three, with each circumferential locking block evenly spaced apart in the circumferential direction on the top surface or end circumferential surface of the connecting post.

[0016] Preferably, the annular flange portion is provided with a plurality of connection holes arranged in a ring.

[0017] A precast pile with a variable diameter structure includes the rotary pile feeding conversion connection device and a precast pile body. A connecting column is disposed on the top of the precast pile body. The connecting column is coaxially arranged with the precast pile body. The outer diameter of the connecting column is smaller than the outer diameter of the precast pile body. The connecting column and the precast pile body form a stepped shaft structure.

[0018] Preferably, the top surface of the precast pile body is provided with an end plate, and the bottom plate is fixedly connected to the end plate.

[0019] Preferably, the annular flange portion abuts axially against the end plate.

[0020] Preferably, the end plate is provided with a plurality of threaded holes, and each connecting hole of the annular flange portion is provided with a corresponding threaded hole of the end plate. The connecting holes are provided with bolts, and the bolts are threadedly connected to the threaded holes to fix the base plate to the end plate.

[0021] Alternatively, the base plate can be welded to the end plate.

[0022] Preferably, the outer diameter of the base plate is less than or equal to the outer diameter of the end plate, and the base plate and the end plate are coaxially arranged.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] 1. This connecting device can be installed on the top of the precast pile body, and the outer diameter of the connecting column is smaller than the outer diameter of the precast pile body, thus forming a variable diameter structure at the connection between the two. This allows the pile cap to only need to match the outer diameter of the connecting device, thereby greatly reducing the size of the pile cap. It ensures that the outer diameter of the pile cap is smaller than the diameter of the clamp. During the rotary pile driving operation, as the precast pile body descends, the pile cap can pass smoothly through the clamp, greatly improving the construction efficiency of rotary pile driving.

[0025] 2. Bolts can be used to fix the base plate to the end plate of the precast pile body, ensuring that the torque can be effectively transmitted to the precast pile body. The torque transmission component realizes the circumferential fixed connection between the pile cap and the connecting column, ensuring that the torque applied by the drill rod can be smoothly transmitted to the precast pile body.

[0026] 3. Because the precast pile body itself has an internal hole structure, the central through hole of the connecting column is connected to the internal hole of the precast pile body to form an air hole, which allows the air hole formed inside the precast pile body to release air, ensuring that the pressure inside and outside the precast pile body is consistent, and the cement and soil can smoothly rise along the air hole, thereby reducing the pressure and resistance encountered during the pile driving process. Attached Figure Description

[0027] Figure 1 This is an exploded view of the rotary pile feeding conversion connection device and the precast pile body of this utility model.

[0028] Figure 2 This is a schematic diagram of the structure of the precast pile of this utility model.

[0029] Figure 3 This is a schematic diagram of the structure of a precast pile used for rotary pile driving in the prior art.

[0030] Figure 4 This is a schematic diagram of the existing technology when the outer diameter of the pile cap is larger than the diameter of the clamp.

[0031] Figure 5 This is a schematic diagram showing the precast pile body of this utility model after the pile cap is put on and clamped by a clamp.

[0032] Figure 6 This is a top view of the rotary pile driving conversion connection device of this utility model.

[0033] In the figure, 100 is the connecting column; 110 is the central through hole; 200 is the base plate; 210 is the annular flange; 220 is the connecting hole; 300 is the torque transmission component; 310 is the circumferential locking block; 400 is the precast pile body; 500 is the end plate; 510 is the threaded hole; 600 is the pile cap; and 700 is the clamp. Detailed Implementation

[0034] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0035] like Figures 1 to 2 , Figure 5 , Figure 6 As shown, a rotary pile driving conversion connection device includes:

[0036] Connecting column 100, the connecting column 100 is set as a cylindrical structure;

[0037] The base plate 200 is fixedly connected to the bottom of the connecting column 100. The outer diameter of the base plate 200 is larger than the outer diameter of the connecting column 100. The base plate 200 and the connecting column 100 are concentrically arranged. The part of the base plate 200 surrounding the connecting column 100 is set as an annular flange 210 for axial connection of the precast pile body 400. The annular flange 210 is provided with a plurality of connecting holes 220 arranged in annularly.

[0038] Torque transmission component 300 is fixedly installed on the top of connecting column 100. Torque transmission component 300 is configured to lock the pile cap 600 and the connecting column 100 circumferentially by engaging with the pile cap 600.

[0039] This device aims to solve the problem that in traditional drilling and pile driving machines, when using the rotary pile driving method in egg, gravel, or strongly weathered rock layers, the pile cap 600 diameter needs to match the outer diameter of the pile end, resulting in the pile cap 600 being too large to pass through the clamp 700.

[0040] Specifically, when planting piles in layers of pebbles, gravel, or strongly weathered rock, the rotary pile driving method using a drilling and pile driving machine has the advantage of breaking shallow gravel or hard interlayers by rotating and cutting the pile body, reducing the resistance to pile settlement, compared to the traditional hammer or static pressure pile driving method.

[0041] However, before rotary pile driving, the pile cap 600 needs to be placed on top of the pile in order to apply downward pressure and torque to the precast pile body 400. For example... Figure 3As shown, in the prior art, angle iron is usually welded directly to the top of the pile, and the pile cap 600 is directly fitted onto the top of the pile. Furthermore, as... Figure 4 As shown, during the construction process using the integrated drilling and pile planting machine, the clamp 700 on the machine needs to clamp the pile body first. The clamp 700 releases the pile body when the pile planting begins, allowing the drill rod to drive the precast pile body 400 to rotate and be inserted through the pile cap 600. As the precast pile body 400 descends, the pile cap 600 needs to pass through the clamp 700. Because the outer diameter of the pile has a specific dimensional standard, the inner diameter of the pile cap 600 needs to match the outer diameter of the pile to achieve the purpose of the pile cap 600 fitting on top of the pile. Therefore, the outer diameter of the pile cap 600 must be larger than the outer diameter of the pile. However, the diameter of the clamp 700 is generally matched to the outer diameter of the pile. In some cases, even after the clamp 700 is fully opened, its diameter is still smaller than the outer diameter of the pile cap 600. This results in the pile cap 600 at the top of the precast pile body 400 being unable to pass through the clamp 700 during the descent of the precast pile body 400, preventing the precast pile body 400 from descending.

[0042] like Figure 1 , Figure 2 , Figure 5 As shown, based on the above problems, this device is designed with a connecting column 100 with a smaller outer diameter. The connecting column 100 serves as a size conversion mechanism, allowing the pile cap 600 to connect to the precast pile body 400. The outer diameter of the connecting column 100 is smaller than that of the precast pile body 400, thus forming a diameter-changing structure at the connection point. The pile cap 600 only needs to match the outer diameter of the thinner connecting column 100, thereby reducing the size of the pile cap 600 and ensuring that its size is smaller than the diameter of the clamp 700. In this example, because the outer diameter of the connecting column 100 is small, the outer diameter of the pile cap 600 can even be smaller than the outer diameter of the precast pile body 400. Even if the clamp 700 is not fully open, the pile cap 600 can still pass through the interior of the clamp 700.

[0043] The base plate 200 is fixedly connected to the bottom of the connecting column 100, and the annular flange 210 of the base plate 200 can be fixedly connected to the end plate 500 of the precast pile body 400 by bolts, thereby transmitting the torque received by the connecting column 100 to the precast pile body 400. The torque transmission component 300 can engage with the pile cap 600, thereby achieving circumferential locking between the pile cap 600 and the connecting column 100. In this way, when the drill rod applies downward pressure and torque, it can be effectively transmitted to the precast pile body 400 through this device, thereby achieving the purpose of rotating and driving the pile.

[0044] In actual use, the annular flange 210 of the base plate 200 is bolted to the end plate 500 of the precast pile body 400, facilitating recycling after use. This not only reduces costs but also meets the requirements of conservation and environmental protection. The outer diameter of the connecting column 100 is smaller than that of the precast pile body 400, so a smaller pile cap 600 can be fitted onto the connecting column 100, ensuring that the outer diameter of the pile cap 600 is smaller than the diameter of the clamp 700. Specifically, a variable diameter structure allows the smaller pile cap 600 to connect to the precast pile body 400 without dimensional conflict with the clamp 700. As the precast pile body 400 continues to descend, the pile cap 600 at its top can smoothly pass through the interior of the clamp 700.

[0045] Based on the above implementation method, the connecting post 100 is provided with a central through hole 110.

[0046] During construction, to enhance the stability and bearing capacity of the pile foundation, cement grout is typically injected into the bottom and surrounding area of ​​the insertion hole. After grouting, the pile is driven into the ground. During this process, because the precast pile body 400 has an internal bore structure, the central through hole 110 of the connecting column 100 connects with the internal bore of the precast pile body 400, forming an air vent. This allows the air vent inside the precast pile body 400 to release air, ensuring consistent pressure inside and outside the precast pile body 400. Cement and soil can then smoothly rise along the air vent, thereby reducing the pressure and resistance encountered during pile driving.

[0047] like Figure 1 , Figure 2 , Figure 5 As shown, the outer diameter of the base plate 200 is less than or equal to the outer diameter of the precast pile body 400. If the outer diameter of the base plate 200 is greater than the outer diameter of the precast pile body 400, the edge of the base plate 200 will still protrude from the outer circumference of the precast pile body 400. In this case, the outer diameter of the base plate 200 may be greater than the diameter of the clamp, causing the precast pile body 400 to be unable to pass through the clamp. However, if the outer diameter of the base plate 200 is less than or equal to the outer diameter of the precast pile body 400, this possibility is completely eliminated.

[0048] like Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the diameter of the outer contour circle of the torque transmitter 300 rotating around the axis of the connecting column 100 is less than or equal to the outer diameter of the base plate 200. Similarly, by limiting the diameter of the outer contour circle of the torque transmitter 300, the possibility that the torque transmitter 300 cannot pass through the fixture due to an excessively large outer diameter is eliminated.

[0049] like Figures 1 to 2As shown, based on the above embodiment, the torque transmission component 300 is configured with at least two circumferential locking blocks 310, which are welded to the top surface or end circumferential surface of the connecting column 100.

[0050] The circumferential locking block 310 is designed to match the groove of the specific shape of the pile cap 600. When the two are engaged, they form a strong circumferential fixed connection to prevent relative slippage during drill pipe rotation.

[0051] Specifically, the pile cap 600 has a locking groove, and each locking groove corresponds to each circumferential locking block 310. The circumferential locking block 310 is embedded in the locking groove to achieve circumferential locking.

[0052] Based on the above implementation, the circumferential locking block 310 protrudes radially from the outer edge of the top surface of the connecting post 100.

[0053] Preferably, there are four circumferential locking blocks 310, which are evenly arranged in the circumferential direction on the top surface of the connecting column 100.

[0054] like Figures 1 to 2 , Figure 5 As shown, based on the above embodiments, a precast pile with a variable diameter structure includes a rotary pile feeding conversion connection device and a precast pile body 400. A connecting column 100 is disposed on the top of the precast pile body 400. The connecting column 100 and the precast pile body 400 are coaxially arranged. The outer diameter of the connecting column 100 is smaller than the outer diameter of the precast pile body 400. The connecting column 100 and the precast pile body 400 form a stepped shaft structure.

[0055] Since the pile cap 600 does not need to be directly fitted onto the precast pile body 400, its diameter only needs to match the thinner connecting column 100. Therefore, a pile cap 600 with a smaller outer diameter can be selected to achieve rotary pile feeding. After the size of the pile cap 600 is reduced, there will be no size conflict with the diameter of the clamp 700, ensuring that the pile cap 600 can pass smoothly through the clamp 700.

[0056] Furthermore, bolts can be used to fix the base plate 200 to the end plate 500 of the precast pile body 400, ensuring that the torque can be effectively transmitted to the precast pile body 400. The torque transmission component 300 realizes the circumferential fixed connection between the pile cap 600 and the connecting column 100, ensuring that the torque applied by the drill rod can be smoothly transmitted to the precast pile body 400.

[0057] During construction, the precast pile body 400 with pile cap 600 is first placed into the pre-drilled insertion hole, and the clamp 700 of the integrated machine clamps the pile body 400. The drill rod is connected to the precast pile body 400 through the pile cap 600. When rotating and driving the pile, the drill rod is started. The drill rod drives the precast pile body 400 to rotate through the pile cap 600 and the connecting column 100. At the same time, the drill rod applies downward pressure to the precast pile body 400 through the connecting column 100, forcing the precast pile body 400 to descend while rotating. As the precast pile body 400 continues to descend, the pile cap 600 at its top can pass smoothly through the inside of the clamp 700. At this time, the entire precast pile body completely leaves the internal area of ​​the clamp 700.

[0058] Based on the above implementation method, the top surface of the precast pile body 400 is provided with an end plate 500, and the annular flange portion 210 abuts against the end plate 500 axially.

[0059] Based on the above implementation method, the end plate 500 is provided with a plurality of threaded holes 510, and each connecting hole 220 of the annular flange portion 210 is provided in a one-to-one correspondence with each threaded hole 510 of the end plate 500. Bolts are provided in the connecting holes 220, and the bolts are threadedly connected to the threaded holes 510 to fix the base plate 200 and the end plate 500.

[0060] During connection, each connection hole 220 is equipped with a bolt. During installation, the bolt first passes through the connection hole 220 on the annular flange 210, and then screws into the corresponding threaded hole 510 on the end plate 500. In this way, the base plate 200 can be firmly fixedly connected to the end plate 500 of the precast pile body 400.

[0061] Alternatively, the base plate 200 can be welded to the end plate 500.

[0062] Based on the above implementation method, the outer diameter of the base plate 200 is less than or equal to the outer diameter of the end plate 500, and the base plate 200 and the end plate 500 are coaxially arranged.

[0063] When the base plate 200 and the end plate 500 have the same outer diameter, the contact area between them can be maximized. This helps to distribute the force more evenly on the end plate 500 when torque or axial pressure is applied, reducing local stress concentration and thus improving the stability and load-bearing capacity of the entire structure. Since the base plate 200 and the end plate 500 are coaxially arranged and have the same outer diameter, precise alignment is easier to achieve during construction. Operators can quickly complete the connection without complex adjustments, reducing installation time and difficulty.

[0064] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment 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.

[0065] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" 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 utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0067] Furthermore, the technical solutions of the various embodiments of this utility model 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 utility model.

[0068] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A rotary pile driving conversion and connection device, characterized in that, include: Connecting post (100); A base plate (200) is fixedly connected to the bottom of the connecting column (100). The outer diameter of the base plate (200) is larger than the outer diameter of the connecting column (100). The base plate (200) and the connecting column (100) are arranged concentrically. The part of the base plate (200) surrounding the connecting column (100) is configured as an annular flange (210) for axial connection of the precast pile body (400). Torque transmitter (300) is fixedly disposed on the top of the connecting column (100), and the torque transmitter (300) is configured to lock the pile cap circumferentially to the connecting column (100) by engaging with the pile cap.

2. The rotary pile driving conversion connection device as described in claim 1, characterized in that: The connecting post (100) is provided with a central through hole (110); And / or, the outer diameter of the base plate (200) is less than or equal to the outer diameter of the precast pile body (400); And / or, the diameter of the outer contour circle of the torque transmission element (300) rotating about the axis of the connecting column (100) is less than or equal to the outer diameter of the base plate (200).

3. The rotary pile driving conversion connection device as described in claim 1, characterized in that: The torque transmission component (300) is configured with at least two circumferential locking blocks (310), which are welded to the top or end circumferential surface of the connecting column (100).

4. The rotary pile driving conversion connection device as described in claim 3, characterized in that: The circumferential locking block (310) protrudes radially from the outer edge of the top surface of the connecting post (100). The number of the circumferential locking blocks (310) is at least three, and each of the circumferential locking blocks (310) is evenly spaced in the circumferential direction on the top surface or end circumferential surface of the connecting post (100).

5. The rotary pile driving conversion connection device as described in claim 3, characterized in that: The annular flange portion (210) is provided with a plurality of connecting holes (220) arranged in an annular pattern.

6. A precast pile with a variable diameter structure, characterized in that, The rotary pile driving conversion connection device as described in any one of claims 1 to 5 further includes a precast pile body (400), a connecting column (100) disposed on the top of the precast pile body (400), the connecting column (100) being coaxially disposed with the precast pile body (400), the outer diameter of the connecting column (100) being smaller than the outer diameter of the precast pile body (400), and the connecting column (100) and the precast pile body (400) forming a stepped shaft structure.

7. The precast pile with a variable diameter structure as described in claim 6, characterized in that: The top surface of the precast pile body (400) is provided with an end plate (500), and the bottom plate (200) is fixedly connected to the end plate (500).

8. The precast pile with a variable diameter structure as described in claim 7, characterized in that: The annular flange (210) abuts axially against the end plate (500).

9. The precast pile with a variable diameter structure as described in claim 7 or 8, characterized in that: The end plate (500) is provided with a plurality of threaded holes (510), and each connecting hole (220) of the annular flange (210) is provided in a corresponding manner to each of the threaded holes (510) of the end plate (500). Each connecting hole (220) is provided with a bolt, and the bolt is threadedly connected to the threaded hole (510) to fix the base plate (200) to the end plate (500). Alternatively, the base plate (200) may be welded to the end plate (500).

10. The precast pile with a variable diameter structure as described in claim 6 or 7, characterized in that: The outer diameter of the base plate (200) is less than or equal to the outer diameter of the end plate (500), and the base plate (200) and the end plate (500) are coaxially arranged.

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