Conical quick connector for prestressed concrete

Abstract

The invention relates to the technical field of tubular pile connection, and particularly discloses a conical quick connector for prestressed concrete, which comprises an upper shell, a lower shell and a connecting pin, a through hole is formed in the upper part of the lower shell, an opening is formed in the lower part of the lower shell, the lower part of the lower shell is in threaded connection with an end cover, and a limiting ring, a clamping ring and a spring are sequentially arranged in the lower shell from top to bottom; the limiting ring is arranged between the clamping ring and the lower shell, the inner wall of the limiting ring and the outer wall of the clamping ring are connected in a matched mode through a conical surface, the spring is arranged between the clamping ring and the end cover, the two ends of the spring abut against the clamping ring and the end cover respectively, the upper end of the connecting pin is connected into the upper shell in a threaded mode, and the lower end of the connecting pin is provided with an anti-pulling part. Clamping teeth are arranged on the anti-pulling part, and clamping grooves matched with the clamping teeth are formed in the inner wall of the clamping ring. The device is simple in structure and convenient to connect, the operation complexity is reduced, and the construction efficiency is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of pipe pile connection technology, specifically relating to a tapered quick connector for prestressed concrete. Background Technology

[0002] Pipe piles, as a type of pile foundation, are widely used in industrial and civil buildings, municipal works, transportation, water conservancy, railways, ports, and large equipment foundation engineering. As a type of prestressed concrete pile, pipe piles not only have advantages such as high bearing capacity and convenient construction, but also effectively improve the bearing capacity and stability of soft soil foundations. However, due to limitations in production, transportation, and construction conditions, the length of a single pipe pile is usually limited, often requiring multiple sections to be connected during construction to meet design depth requirements. The quality of the connection between piles directly affects the load transfer efficiency and the pull-out resistance of the entire foundation engineering.

[0003] In existing technologies, the connection methods between pipe piles are mainly divided into two categories: welding and mechanical connection. While welding can achieve a strong connection, it is greatly affected by the site environment, making it difficult to guarantee welding quality, and it also has low construction efficiency. Mechanical connection, on the other hand, uses end plates, keyways, and rigid connectors to complete the connection, which can improve installation reliability to some extent. However, these mechanical joints are usually complex in structure, requiring multiple steps during installation, such as sequentially moving the rigid connectors, placing the sliding blocks, and rotating the upper pipe pile, making the operation cumbersome and inefficient. Furthermore, existing mechanical joints are mostly planar contact structures, and their pull-out resistance depends on the strength and installation accuracy of the joint components, limiting the transmission of force.

[0004] Especially in the construction of tension piles, the reliability and tensile strength of mechanical joints are crucial. If the connection structure becomes loose or stuck under stress, it will not only reduce the overall bearing capacity of the pile foundation, but may also cause pile foundation failure, seriously affecting the quality of the project.

[0005] Therefore, we propose a tapered quick connector for prestressed concrete to solve the above-mentioned technical problems. Summary of the Invention

[0006] In order to solve the technical problems existing in the prior art, the present invention proposes a tapered quick connector for prestressed concrete.

[0007] The technical solution adopted in this invention is as follows: A conical quick connector for prestressed concrete includes an upper housing, a lower housing, and a connecting pin. The lower housing has a through hole at the top and an opening at the bottom with a threaded end cap. Inside the lower housing, from top to bottom, there are a limiting ring, a retaining ring, and a spring. The retaining ring is truncated cone-shaped and is formed by splicing at least two equal parts. The limiting ring is located between the retaining ring and the lower housing. The inner wall of the limiting ring is connected to the outer wall of the retaining ring through a conical surface fit. The spring is located between the retaining ring and the end cap, with its two ends abutting against the retaining ring and the end cap, respectively. The upper end of the connecting pin is threaded into the upper housing, and the lower end of the connecting pin has a pull-out resistant part with retaining teeth. The inner wall of the retaining ring has a retaining groove that matches the retaining teeth.

[0008] In a further technical solution, the pull-out resisting part has a taper, and the outer diameter of the pull-out resisting part increases from top to bottom.

[0009] In a further technical solution, the lower end of the pull-out resistant part is integrally formed with a cone, and the outer diameter of the cone decreases from top to bottom.

[0010] In a further technical solution, a first hexagonal screw hole is formed on the top surface of the cone, and a second hexagonal screw hole is formed inside the first hexagonal screw hole.

[0011] In a further technical solution, the spring is provided with a first washer and a second washer at both ends. The first washer and the second washer are slidably engaged with the lower housing. The first washer abuts against the retaining ring, and the second washer abuts against the end cap.

[0012] In a further technical solution, the upper end of the upper shell and the lower end of the lower shell are respectively integrally formed with a first anchor plate and a second anchor plate.

[0013] In a further technical solution, a third hexagonal screw hole is provided on the end cap, and a fourth hexagonal screw hole is provided inside the third hexagonal screw hole.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The present invention has a simple structure. The engagement of the snap ring, which is composed of multiple equal parts, with the anti-pull-out part, and the spring's reset and the constraint of the limiting ring, stably locks the connecting pin in the lower housing. The connection is simple and quick, reducing the complexity of operation, effectively improving construction efficiency, and the connection is firm and reliable, which can meet the needs of various projects.

[0015] 2. The pull-out resisting part of the present invention has a tapered design with an increasing outer diameter from top to bottom, which can avoid excessive force concentration on the retaining teeth, effectively reduce local wear, and improve the service life of the retaining teeth. In addition, a tapered part with a decreasing outer diameter from top to bottom is integrally formed at the lower end of the pull-out resisting part, which can first enter the retaining ring through the tapered part and expand the retaining ring through its inclined surface, thereby facilitating the insertion of the pull-out resisting part.

[0016] 3. By setting multi-level screw holes on the connecting pin and end cap, the present invention allows for the flexible use of different tools under different construction conditions, thereby improving the flexibility and convenience of construction. Attached Figure Description

[0017] The present invention will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the connecting pin of the present invention; Figure 3 This is a schematic diagram of the limiting ring structure of the present invention; Figure 4 This is a schematic diagram of the clasp structure of the present invention; Figure 5 This is a schematic diagram of the end cap structure of the present invention.

[0018] Reference numerals: 1-Upper shell, 2-Lower shell, 3-Connecting pin, 4-Through hole, 5-End cap, 6-Limiting ring, 7-Snap ring, 8-Spring, 9-Pull-out part, 91-Conical part, 10-Snap tooth, 11-Snap groove, 12-First hexagonal screw hole, 13-Second hexagonal screw hole, 14-First washer, 15-Second washer, 16-First anchor plate, 17-Second anchor plate, 18-Third hexagonal screw hole, 19-Fourth hexagonal screw hole. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example: See Figures 1-5This invention provides a conical quick connector for prestressed concrete, comprising an upper housing 1, a lower housing 2, and a connecting pin 3. The lower housing 2 has a through hole 4 at the top and an opening at the bottom with an end cap 5 threadedly connected to it. Inside the lower housing 2, from top to bottom, there are a limiting ring 6, a retaining ring 7, and a spring 8. The retaining ring 7 is a frustum cone shape and is formed by splicing at least two equal parts. The limiting ring 6 is located between the retaining ring 7 and the lower housing 2. The inner wall of the limiting ring 6 is connected to the outer wall of the retaining ring 7 through a conical surface fit. The spring 8 is located between the retaining ring 7 and the end cap 5, with both ends abutting against the retaining ring 7 and the end cap 5, respectively. The upper end of the connecting pin 3 is threadedly connected to the upper housing 1. The lower end of the connecting pin 3 has a pull-out resistant part 9 with a retaining tooth 10. The inner wall of the retaining ring 7 has a retaining groove 11 that matches the retaining tooth 10.

[0021] During installation, the limiting ring 6, retaining ring 7, and spring 8 are first inserted into the lower housing 2 through the lower opening, and then the end cap 5 is threaded into the lower opening of the lower housing 2 to complete the assembly of the components inside the lower housing 2. Subsequently, the upper housing 1 and lower housing 2 are pre-embedded in the concrete of the upper and lower pipe piles, respectively, forming corresponding mechanical joints. To prevent debris from entering and affecting subsequent use, the upper opening of the lower housing 2 and the lower threaded opening of the upper housing 1 should be temporarily blocked with wooden plugs or cardboard before pre-embedding. Next, during the connection process, the upper end of the connecting pin 3 is first screwed into the lower threaded opening of the upper housing 1. Then, the lower anti-pull-out part 9 of the connecting pin 3 is aligned with the upper opening of the lower housing 2 and inserted. During insertion, the anti-pull-out part 9 passes through the limiting ring 6 and abuts against the retaining ring 7. The retaining ring 7 is then pressed downwards, at which point the spring 8 contracts. Since the retaining ring 7 is a structure composed of multiple equal parts (here, it is a three-part structure), the retaining ring 7 will spread outwards during the downward pressing process, expanding the opening and allowing the anti-pull-out part 9 to be inserted into the retaining ring 7. After the anti-pull-out part 9 is fully inserted into the retaining ring 7, the connecting pin 3 is pulled upwards, the spring 8 returns to its original position, and the retaining ring 7 rises. Under the guidance of the conical surface on the inner wall of the limiting ring 6, the retaining ring 7 contracts and closes, causing the inner wall groove 11 to engage with the retaining teeth 10 on the anti-pull-out part 9, thus completing the locking. At this point, the upper and lower sections of the pipe pile are quickly connected. When the connecting pin 3 is subjected to an upward tensile load, the retaining ring 7 will not come loose under the constraint of the limiting ring 6. Instead, it will tighten further under stress, effectively improving the pull-out resistance of the connector and ensuring the overall bearing capacity and engineering quality of the pile foundation. Compared with traditional pipe pile connection methods, this connector has a simple structure. The retaining ring 7, which is composed of multiple equal parts, meshes with the pull-out resistance part 9. Under the reset of the spring 8 and the constraint of the limiting ring 6, the connecting pin 3 is stably locked in the lower housing 2. The connection is simple and quick, reducing the complexity of operation, effectively improving construction efficiency, and the connection is firm and reliable, meeting the needs of various projects.

[0022] In one specific implementation, see Figure 2 The pull-out resisting part 9 has a taper, and the outer diameter of the pull-out resisting part 9 increases from top to bottom.

[0023] The pull-out section 9 has a tapered shape with an increasing outer diameter from top to bottom. When the connecting pin 3 is pulled upward, the force is not only applied to the locking tooth 10 itself, but can also be transmitted through the tapered structure and evenly distributed by the locking ring 7, thereby avoiding excessive concentration of force on the locking tooth 10, effectively reducing local wear and improving the service life of the locking tooth 10.

[0024] In one specific implementation, see Figure 2 The lower end of the pull-out part 9 is integrally formed with a cone 91, and the outer diameter of the cone 91 decreases from top to bottom.

[0025] By integrally forming a tapered portion 91 with a decreasing outer diameter from top to bottom at the lower end of the pull-out portion 9, the tapered portion 91 can enter the retaining ring 7 first during the insertion of the connecting pin 3, and expand the retaining ring 7 through its inclined surface, thereby facilitating the insertion of the pull-out portion 9.

[0026] In one specific implementation, see Figure 1 and Figure 2 The top surface of the cone 91 is provided with a first hexagonal screw hole 12, and a second hexagonal screw hole 13 is provided inside the first hexagonal screw hole 12.

[0027] The connecting pin 3 can be rotated through both the first hexagonal screw hole 12 and the second hexagonal screw hole 13, allowing for flexible use of different tools under various construction conditions. For example, in situations with limited space, a small hexagonal tool can be used to ensure smooth construction. Furthermore, the screw hole type is not limited to hexagonal screw holes; other common types of screw holes can also be used, further improving the flexibility and convenience of construction.

[0028] In one specific implementation, see Figure 1 The spring 8 has a first washer 14 and a second washer 15 at its two ends. The first washer 14 and the second washer 15 are slidably engaged with the lower housing 2. The first washer 14 abuts against the retaining ring 7 and the second washer 15 abuts against the end cap 5.

[0029] By setting a first washer 14 and a second washer 15 at both ends of the spring 8 and slidingly engaging with the inner wall of the lower housing 2, the spring 8 can remain stable during axial compression and reset, without shifting or tilting, thus avoiding failure of the retaining ring 7 and improving the reliability and durability of the overall structure.

[0030] In one specific implementation, see Figure 1 The upper end of the upper shell 1 and the lower end of the lower shell 2 are respectively integrally formed with a first anchor plate 16 and a second anchor plate 17.

[0031] By setting the first anchor plate 16 and the second anchor plate 17, the anchoring force of the upper shell 1 and the lower shell 2 in the concrete can be increased, thereby improving the pull-out resistance of the connector and ensuring that the pipe pile connection is firm and reliable.

[0032] In one specific implementation, see Figure 1 and Figure 5 The end cap 5 has a third hexagonal screw hole 18, and a fourth hexagonal screw hole 19 is formed inside the third hexagonal screw hole 18.

[0033] Similarly, end cap 5 and connecting pin 3 can be operated using different specifications of tools through different screw holes on end cap 5, thereby adapting to various construction conditions and improving construction convenience.

[0034] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A tapered quick connector for prestressed concrete, characterized in that, The device includes an upper housing (1), a lower housing (2), and a connecting pin (3). The lower housing (2) has a through hole (4) at the top and an opening at the bottom with a threaded end cap (5). Inside the lower housing (2), from top to bottom, there are a limiting ring (6), a retaining ring (7), and a spring (8). The retaining ring (7) is a frustum cone and is formed by splicing at least two equal parts. The limiting ring (6) is located between the retaining ring (7) and the lower housing (2). The inner surface of the limiting ring (6) is... The outer wall of the retaining ring (7) is connected by a conical surface. The spring (8) is located between the retaining ring (7) and the end cap (5), and its two ends abut against the retaining ring (7) and the end cap (5) respectively. The upper end of the connecting pin (3) is threaded into the upper housing (1). The lower end of the connecting pin (3) is provided with an anti-pull-out part (9). The anti-pull-out part (9) is provided with a retaining tooth (10). The inner wall of the retaining ring (7) is provided with a retaining groove (11) that matches the retaining tooth (10).

2. The tapered quick connector for prestressed concrete according to claim 1, characterized in that, The pull-out portion (9) has a taper, and the outer diameter of the pull-out portion (9) increases from top to bottom.

3. A tapered quick connector for prestressed concrete according to claim 2, characterized in that, The lower end of the pull-out part (9) is integrally formed with a cone (91), and the outer diameter of the cone (91) decreases from top to bottom.

4. A tapered quick connector for prestressed concrete according to claim 3, characterized in that, The top surface of the cone (91) is provided with a first hexagonal screw hole (12), and a second hexagonal screw hole (13) is provided inside the first hexagonal screw hole (12).

5. A tapered quick connector for prestressed concrete according to claim 1, characterized in that, The spring (8) has a first washer (14) and a second washer (15) at both ends. The first washer (14) and the second washer (15) are slidably engaged with the lower housing (2). The first washer (14) abuts against the retaining ring (7), and the second washer (15) abuts against the end cap (5).

6. A tapered quick connector for prestressed concrete according to claim 1, characterized in that, The upper end of the upper shell (1) and the lower end of the lower shell (2) are integrally formed with a first anchor plate (16) and a second anchor plate (17).

7. A tapered quick connector for prestressed concrete according to claim 1, characterized in that, The end cap (5) has a third hexagonal screw hole (18), and a fourth hexagonal screw hole (19) is provided inside the third hexagonal screw hole (18).

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