Double-locking precast pile foundation connector

Abstract

The utility model provides a kind of double locking prefabricated pile base connecting piece of lock type, including first sleeve, second sleeve and connecting rod, first sleeve and second sleeve are respectively embedded in the joint end of two adjacent prefabricated piles, first sleeve is connected with second sleeve by connecting rod;First sleeve inner wall is connected with the one end of connecting rod by screw thread, and the other end of connecting rod is equipped with first protrusion and second protrusion for being connected with second sleeve;Second sleeve inner wall is connected with the outer wall of third sleeve by screw thread, and spring buckle is installed on the upper portion of third sleeve inner chamber, and annular protrusion is equipped in lower portion;Groove is set in annular protrusion inner wall, and clamping ring is installed in groove.The double locking prefabricated pile base connecting piece of lock type described in the utility model sets up two protrusions on connecting rod, and double locking mechanism is set in second sleeve and matched with connecting rod, and only need to align and assemble first sleeve and second sleeve of adjacent prefabricated pile to realize connection, start two layers of protection, so that pile foundation connection is more reliable.

Description

[0001] This application claims priority to Chinese Patent Application No. 2025208071653, filed on April 25, 2025, entitled "A Locking Double-Locking Precast Pile Foundation Connector", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This utility model belongs to the field of precast concrete pile foundation connection technology, and in particular relates to a locking double-locking precast pile foundation connector. Background Technology

[0003] As an indispensable key component in building construction, pile foundations primarily function to effectively transfer the building's load to the deep foundation, thereby ensuring the stability and safety of the entire structure. To meet different geological conditions and engineering requirements, precast piles come in a variety of diameters, lengths, and types. In practical applications, these precast piles require reliable connection methods to achieve the required service length, thus forming a complete pile foundation system.

[0004] Traditional precast piles are connected by welding the end plates of two precast pile sections. However, welding requires a high level of skill from workers and is subject to strict environmental conditions. The welding quality is also easily affected by external factors such as weather, leading to unstable connection quality. In addition, the soil contains corrosive substances such as chloride salts, which can easily corrode the steel plates of the precast piles buried in the soil, causing breakage at the connection between the piles. This reduces the bearing capacity and service life of the pile foundation, increasing the safety hazards of the project.

[0005] Besides welded connections, most pile foundations employ a single mechanical connection structure for single-layer locking. During construction, misalignment of pile sections can easily lead to connection failure. Furthermore, under long-term dynamic loads, stress concentration can easily occur at a single connection node, making the connection a weak point in the entire pile foundation and affecting its durability and reliability. In addition, the complex corrosive environment underground can also adversely affect the performance of a single connection structure, accelerating its degradation and further reducing connection stability. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model aims to propose a locking double-locking precast pile foundation connector. This locking double-locking precast pile foundation connector solves the problem of low stability caused by the existing precast pile foundation connectors achieving pile foundation connection through single-layer locking.

[0007] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0008] A locking double-locking precast pile foundation connector includes a first sleeve, a second sleeve, and a connecting rod. The first sleeve and the second sleeve are respectively pre-embedded at the joint end of two adjacent precast piles, and the first sleeve and the second sleeve are connected by the connecting rod.

[0009] The inner wall of the first sleeve is threaded to one end of the connecting rod, and the other end of the connecting rod is provided with a first protrusion and a second protrusion for connecting with the second sleeve;

[0010] The inner wall of the second sleeve is threadedly connected to the outer wall of the third sleeve. The upper part of the inner cavity of the third sleeve is equipped with a spring clip for limiting the first protrusion or the second protrusion, and the lower part is provided with an annular protrusion. A groove is opened in the inner wall of the annular protrusion, and a retaining ring for limiting the second protrusion is installed in the groove.

[0011] Furthermore, the bottom of the first protrusion and the bottom of the second protrusion are arc-shaped transition structures, which facilitates the positioning and accurate insertion of the connecting rod.

[0012] Furthermore, the lower part of the first protrusion has a small arc transition structure, the lower part of the second protrusion has a large arc transition structure, and the second protrusion is located at the bottom of the connecting rod.

[0013] Furthermore, the spring clip is an elastic buckle that extends straight up and retracts downwards, with the lower end of the elastic buckle retracting inwards in an octagonal shape.

[0014] Furthermore, the retaining ring is an annular locking piece, with a square lower cross-section and two upper sides inclined towards the middle, forming a triangular cross-section.

[0015] Furthermore, the clasp surface has four slits, one of which is a through slit, and the others are semi-through slits.

[0016] Furthermore, a first sleeve and a second sleeve are pre-embedded at both ends of each precast pile section. The first sleeve and the second sleeve are respectively connected to the two ends of the main reinforcement in the precast pile. In a multi-section precast pile, the first sleeve and the second sleeve of two adjacent precast pile sections are sequentially assembled to form a long pile through connecting rods.

[0017] Furthermore, structural adhesive is filled inside the second sleeve before the insertion of the connecting rod, so that the joint end faces of the two adjacent precast columns after the insertion of the connecting rod are covered with structural adhesive.

[0018] Compared with existing technologies, the snap-lock type double-locking precast pile foundation connector of this utility model has the following advantages:

[0019] The snap-lock type double-locking precast pile foundation connector of this utility model features two protrusions on the connecting rod and a double-layer locking mechanism inside the second sleeve that cooperates with the connecting rod. Connection is achieved simply by aligning and assembling the first and second sleeves of adjacent precast piles, activating the two layers of protection for a more secure pile foundation connection. Simultaneously, the double-layer locking mechanism prevents connection failure caused by uneven pile surfaces or construction errors during pile splicing, which could result in the first protrusion of the connecting rod failing to insert into the spring clip. If the connecting rod cannot fully enter the spring clip due to error, the second protrusion can be successfully locked with the spring clip, thus ensuring the stability and reliability of the entire connection. Attached Figure Description

[0020] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0021] Figure 1 A schematic diagram of the first sleeve structure provided in an embodiment of this utility model;

[0022] Figure 2 This is a schematic diagram of the second sleeve structure provided in an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the connector assembly provided in an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the third sleeve structure provided in an embodiment of the present utility model;

[0025] Figure 5 This is a schematic diagram of the spring clip structure provided in an embodiment of the present utility model;

[0026] Figure 6 This is a schematic cross-sectional view of the retaining ring provided in an embodiment of the present utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. First sleeve; 2. Second sleeve; 21. Third sleeve; 22. Spring clip; 23. Annular protrusion; 24. Groove; 25. Snap ring; 3. Connecting rod; 31. First protrusion; 32. Second protrusion; 41. Precast pile one; 42. Precast pile two; 43. Main reinforcement one; 44. Main reinforcement two. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figures 1 to 6 As shown, a locking double-locking precast pile foundation connector is used to connect two adjacent precast pile sections 41 and 42. The connector includes a first sleeve 1, a second sleeve 2, and a connecting rod 3. The top end of the first sleeve 1 is connected to the main reinforcement bar 43 at one end of the precast pile 41, and the bottom end of the second sleeve 2 is connected to the main reinforcement bar 44 at one end of the precast pile 42. The first sleeve 1 and the second sleeve 2 are connected by the connecting rod 3.

[0034] The inner wall of the first sleeve 1 is threaded to one end of the connecting rod 3, and the other end of the connecting rod 3 is provided with a first protrusion 31 and a second protrusion 32. The first protrusion 31 and the second protrusion 32 are used to connect with the second sleeve 2.

[0035] The inner wall of the second sleeve 2 is threadedly connected to the outer wall of the third sleeve 21. A spring clip 22 is installed on the upper part of the inner cavity of the third sleeve 21. The spring clip 22 is used to limit the first protrusion 31 or the second protrusion 32. The lower part of the third sleeve 21 is provided with an annular protrusion 23. A groove 24 is opened on the inner wall of the annular protrusion 23. A retaining ring 25 is installed in the groove 24. The retaining ring 25 is used to limit the second protrusion 32.

[0036] In a preferred embodiment of this utility model, the inner wall of the first sleeve 1 is provided with an internal thread, and the upper outer wall of the connecting rod 3 is provided with an external thread. The two are connected by threads, which facilitates installation.

[0037] In a preferred embodiment of this utility model, the second sleeve 2 is a column with a smooth outer wall and a thread on the inner wall for connection with the third sleeve 21. Structural adhesive is filled inside the second sleeve 2 before the connecting rod 3 is inserted. After the connecting rod 3 is inserted, the structural adhesive inside the second sleeve 2 is squeezed out, so that when the first sleeve 1 and the second sleeve 2 are joined, there is structural adhesive on the contact surface, so that the second sleeve 2 is in a completely sealed state, preventing the connector from being corroded.

[0038] In a preferred embodiment of this utility model, the bottom of the first protrusion 31 and the bottom of the second protrusion 32 are arc-shaped transition structures, which facilitates the positioning and accurate insertion of the connecting rod 3. Specifically, the lower part of the first protrusion 31 is a small arc transition structure to ensure the strength of the locking connection; the lower part of the second protrusion 32 is a large arc transition structure to facilitate quick insertion and positioning, and is located at the bottom of the connecting rod 3.

[0039] In practical use, the connecting rod 3 is a one-piece molded tapered rod. The first protrusion 31 and the second protrusion 32 are protrusions formed relative to the rod body, and the first protrusion 31 and the second protrusion 32 are hook-shaped protrusions, which help guide and center the rod when inserting the third sleeve 21, reduce the deviation and jamming during the insertion process, and improve the accuracy and efficiency of assembly. The arc design can reduce the resistance and wear during insertion and extend the service life of the connecting parts.

[0040] In a preferred embodiment of this utility model, the upper diameter of the inner cavity of the third sleeve 21 is larger than the lower diameter, and the upper inner wall is provided with threads to be threadedly connected to the first locking mechanism spring clip 22; the lower part is provided with an annular protrusion 23 to increase the thickness of the lower inner wall so as to open a groove 24 to place the second locking mechanism clip ring 25.

[0041] In a preferred embodiment of this utility model, the spring clip 22 is an elastic buckle that is straight at the top and tapered at the bottom, and the lower end of the elastic buckle is in the shape of an inwardly retracting octagon.

[0042] In actual use, the top of the spring clip 22 is installed on the top of the third sleeve 21, the lower part extends into the third sleeve 21, and the outer wall of the middle part is threaded to the inner wall of the third sleeve 21. The spring clip 22 is funnel-shaped with a straight top and a tapering bottom, and the vertical part can play a good guiding role in actual use. The lower end of the spring clip 22 is octagonal in shape that retracts inward. This octagonal elastic buckle structure has good elastic deformation capability and can adapt to connecting rods 3 of different diameters or sizes within a certain range.

[0043] During the process of inserting the connecting rod 3 into the spring clip 22 under the action of external force, the eight-claw-shaped claw at the lower end of the spring clip 22 expands outward. When the first protrusion 31 or the second protrusion 32 on the connecting rod 3 passes through the spring clip 22, the eight-claw-shaped claw will retract using its own elasticity to tightly lock the rod body of the connecting rod 3, thereby locking the connecting rod 3 and ensuring the stability of the connection.

[0044] In a preferred embodiment of this utility model, the retaining ring 25 is an annular locking piece, the lower cross section of the retaining ring 25 is square, and the upper two sides are inclined towards the middle to form a triangular cross section.

[0045] In actual use, the bottom of the retaining ring 25 is flat, and the upper two sides slope towards the middle to form a bevel with a triangular cross-section. The surface of the retaining ring 25 has four slits. To ensure that the retaining ring 25 can expand during the insertion of the connecting rod 3, one slit is a through slit, and the others are semi-through slits, retaining a portion of the connection. During the insertion of the connecting rod 3, the retaining ring 25 expands until the second protrusion 32 of the connecting rod 3 completely passes through the retaining ring 25, at which point the retaining ring 25 retracts, completing the second locking mechanism.

[0046] In a preferred embodiment of this utility model, a first sleeve 1 and a second sleeve 2 are pre-embedded at both ends of each precast pile section. The first sleeve 1 and the second sleeve 2 are respectively connected to the two ends of the main reinforcement in the precast pile. The first sleeve 1 and the second sleeve 2 of two adjacent precast pile sections are sequentially assembled to form a long pile.

[0047] In actual use, each precast pile section is equipped with a main reinforcement bar, and the two ends of the same main reinforcement bar are connected to the first sleeve 1 and the second sleeve 2 respectively; the top opening of the first sleeve 1 is used to connect to one end of the main reinforcement bar, and the bottom opening of the second sleeve 2 is used to connect to the other end of the main reinforcement bar.

[0048] Each precast pile section has a first sleeve 1 and a second sleeve 2 pre-embedded at both ends. Adjacent precast pile sections can be reliably connected by assembling the first sleeve 1 and the second sleeve 2 to form an integral structure, thereby improving the stability and bearing capacity of the entire pile foundation.

[0049] Assembly process of locking double-locking precast pile foundation connectors:

[0050] Select two adjacent precast piles 41 and 42. First, screw one end of the connecting rod 3 into the first sleeve 1 of the precast pile 41. Then, install the third sleeve 21 into the second sleeve. Next, install the spring clip 22 into the third sleeve 21. Then, align the first sleeve 1 with the second sleeve 2 of the precast pile 42. After alignment, insert the other end of the connecting rod 3 into the third sleeve 21.

[0051] During the insertion of the connecting rod 3 into the third sleeve 21, the second protrusion 32 of the connecting rod 3 first enters the spring clip 22. Under the action of external force, the eight-claw-shaped claw at the lower end of the spring clip 22 is pushed open, and the second protrusion 32 continues to move downward and squeezes open the retaining ring 25. When the second protrusion 32 is completely below the retaining ring 25, the retaining ring 25 retracts and locks the rod body of the connecting rod 3. At the same time as the second protrusion 32 moves downward, the first protrusion 31 passes through the spring clip 22 and is located below the spring clip 22. The eight-claw-shaped claw at the lower end of the spring clip 22 retracts and locks the rod body of the connecting rod 3. The two locking mechanisms are triggered simultaneously to achieve double locking.

[0052] During construction, if the pile surface is uneven or construction error causes the connecting rod 3 to fail to fully enter the third sleeve 21, as long as the second protrusion 32 enters and is located below the spring clip 22 and is locked by the spring clip 22, a locking mechanism will be triggered to ensure that the connection is effective.

[0053] Before the connecting rod 3 is inserted into the second sleeve 2, structural adhesive is poured into the second sleeve 2. After the connecting rod 3 enters the second sleeve 2, the structural adhesive overflows from the pile end surface as the connecting rod 3 enters, so that the contact surface of the upper and lower pile sections is covered with structural adhesive. Regardless of whether the two protrusions of the connecting rod 3 are fully or partially inserted, the second sleeve 2 remains completely sealed to prevent corrosion of the connector.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A locking double-locking precast pile foundation connector, comprising a first sleeve, a second sleeve, and a connecting rod, wherein the first sleeve and the second sleeve are respectively pre-embedded at the joint ends of two adjacent precast pile sections, and the first sleeve and the second sleeve are connected by the connecting rod, characterized in that: The inner wall of the first sleeve is threaded to one end of the connecting rod, and the other end of the connecting rod is provided with a first protrusion and a second protrusion for connecting with the second sleeve; The inner wall of the second sleeve is threadedly connected to the outer wall of the third sleeve. The upper part of the inner cavity of the third sleeve is equipped with a spring clip for limiting the first protrusion or the second protrusion, and the lower part is provided with an annular protrusion. A groove is opened in the inner wall of the annular protrusion, and a retaining ring for limiting the second protrusion is installed in the groove.

2. The locking double-locking precast pile foundation connector according to claim 1, characterized in that: The bottom of the first protrusion and the bottom of the second protrusion are arc-shaped transition structures, which facilitates the positioning and accurate insertion of the connecting rod.

3. The locking double-locking precast pile foundation connector according to claim 2, characterized in that: The lower part of the first protrusion has a small arc transition structure, and the lower part of the second protrusion has a large arc transition structure, and the second protrusion is located at the bottom of the connecting rod.

4. The locking double-locking precast pile foundation connector according to claim 1, characterized in that: The spring clip is an elastic buckle that is straight at the top and retracts at the bottom, with the lower end of the elastic buckle having an inwardly retracting octagonal shape.

5. The locking double-locking precast pile foundation connector according to claim 1, characterized in that: The retaining ring is an annular locking piece. The lower part of the retaining ring has a square cross-section, while the upper two sides are inclined towards the middle, forming a triangular cross-section.

6. The locking double-locking precast pile foundation connector according to claim 1, characterized in that: The clasp surface has four slits, one of which is a through slit, and the others are semi-through slits.

7. The locking double-locking precast pile foundation connector according to claim 1, characterized in that: Each precast pile section has a first sleeve and a second sleeve pre-embedded at both ends. The first sleeve and the second sleeve are respectively connected to the two ends of the main reinforcement in the precast pile. In a multi-section precast pile, the first sleeve and the second sleeve of two adjacent sections of precast pile are sequentially assembled to form a long pile through connecting rods.

8. The locking double-locking precast pile foundation connector according to claim 1, characterized in that: The second sleeve is filled with structural adhesive before the insertion of the connecting rod, so that the joint end faces of the two adjacent precast columns after the insertion of the connecting rod are covered with structural adhesive.

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