Quick connection prestressed pipe pile

Abstract

The utility model provides a quick connection prestressed pipe pile, including first pipe pile and second pipe pile, one end of first pipe pile is equipped with movable female joint, one end of second pipe pile is equipped with male joint, first pipe pile with second pipe pile is connected fixed through movable female joint with male joint, wherein, movable female joint includes the sleeve of fixed first pipe pile end and the sleeve cooperation movable nut, through the ingenious cooperation design of sleeve and movable nut, not only has improved the pipe pile connection efficiency, has reduced the time needed for traditional welding, and has solved the technical problem of pipe pile centering difficulty in the on -the -spot construction.

Description

Technical Field

[0001] This utility model relates to the field of building technology, and in particular to a quick-connecting prestressed pipe pile. Background Technology

[0002] Prestressed concrete pipe piles are widely used in engineering construction, especially in soft soil areas, due to their advantages such as convenient construction, fast pile formation, and low cost. However, due to the limitation of single pile length, frequent splicing is required during construction to achieve the design bearing depth. Existing splicing technologies for prestressed concrete pipe piles mainly adopt welding processes, but these suffer from problems such as low efficiency, difficulty in quality control, and significant safety hazards. While screw-locking connections are convenient to operate, the number of usable mechanical joints is reduced due to uneven concrete end faces and inconsistent installation heights of manual insertion rods, resulting in insufficient tensile strength of the joints. Clamp-type mechanical connections, on the other hand, tend to reach yield strength easily due to stress concentration at the screws, resulting in weak tensile strength.

[0003] Therefore, there is an urgent need for a prestressed concrete pipe pile connection technology that can guarantee the quality and strength of pile splicing while improving construction efficiency and reducing safety risks, in order to meet the actual needs of engineering construction. Currently, there is no mature technical solution on the market that can simultaneously solve the three major problems of pile splicing efficiency, quality control, and safety. Utility Model Content

[0004] The purpose of this invention is to solve the technical problems of low welding efficiency and unstable quality in the prior art.

[0005] This utility model provides a quick-connecting prestressed pipe pile, including a first pipe pile and a second pipe pile;

[0006] One end of the first pipe pile is provided with a movable female connector, and one end of the second pipe pile is provided with a male connector. The first pipe pile and the second pipe pile are connected and fixed through the movable female connector and the male connector.

[0007] The movable female connector includes a ferrule fixed to the end of the first pipe pile and a movable nut that mates with the ferrule.

[0008] Furthermore, the ferrule is welded to the end plate of the first pipe pile, and the male connector is welded to the end plate of the second pipe pile.

[0009] Furthermore, the movable nut and the ferrule are fitted with a tapered surface.

[0010] Furthermore, the taper between the movable nut and the ferrule is 1:n, where n is a positive number.

[0011] Furthermore, the taper is 1:5.

[0012] Furthermore, the maximum unilateral radial clearance δ between the ferrule and the movable nut is equal to the axial movement distance H of the movable nut divided by the taper n.

[0013] Furthermore, the maximum single-sided radial clearance δ is 1 / 20 to 1 / 10 of the outer radius d of the first pipe pile.

[0014] Furthermore, the movable nut is provided with a screw rod to assist in rotating the movable nut.

[0015] Furthermore, the second pipe pile is provided with a fixing rod, and the fixing rod is provided with a through hole, which is used to insert a ground anchor and fix the second pipe pile.

[0016] Furthermore, a locking structure is provided between the movable nut and the ferrule, the locking structure being used to limit radial misalignment between the pipe piles.

[0017] Compared with the prior art, this utility model has at least the following beneficial effects: Through the ingenious design of the ferrule and the movable nut, it not only improves the connection efficiency of the pipe pile and shortens the time required for traditional welding, but also solves the technical problem of difficult pipe pile alignment in on-site construction. At the same time, due to the conical surface fit structure of the movable nut and the ferrule, the connection strength is higher and more reliable, and it is not affected by the environment and the operator's skills, thus improving the construction quality and safety of prestressed pipe piles. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained as provided without creative effort.

[0019] Figure 1 This is a schematic diagram of a partial assembly structure of two pipe piles before connection in one embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of a partial assembly structure of two pipe piles connected in one embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of a partial assembly structure of the female connector in one embodiment of the present invention.

[0022] Among them, 1-first pipe pile; 2-first pipe pile end plate; 3-clamp; 4-movable nut; 5-tightening rod; 6-male connector; 7-second pipe pile end plate; 8-second pipe pile; 9-fixing rod. Detailed Implementation

[0023] The present invention will now be described in more detail with reference to the accompanying drawings, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art can modify the present invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being broadly known to those skilled in the art and is not intended to limit the present invention.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] The present invention will be described in more detail below by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer as will be explained below. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0026] This embodiment provides a method for quickly connecting prestressed concrete pipe piles. Please refer to [link / reference]. Figures 1-3 , including the first pipe pile 1 and the second pipe pile 8;

[0027] One end of the first pipe pile 1 is provided with a movable female connector, and one end of the second pipe pile 8 is provided with a male connector 6. The first pipe pile 1 and the second pipe pile 8 are connected and fixed by the movable female connector and the male connector 6.

[0028] The movable female connector includes a sleeve 3 fixed to the end of the first pipe pile 1 and a movable nut 4 that mates with the sleeve 3.

[0029] The ferrule 3 in the movable female connector can be fixed to the end of the first pipe pile 1 by welding, bolting, or integral molding. The ferrule 3 is preferably made of high-strength steel, and its inner surface can be machined into a tapered structure. The movable nut 4 can be a hexagonal nut or a flange nut, and its outer surface is machined with a taper that matches the inner tapered surface of the ferrule 3. The male connector 6 can be fixed to the end of the second pipe pile 8 by welding or threaded connection, and its outer diameter matches the inner diameter of the movable nut 4. As a preferred embodiment, the ferrule 3 is welded to the end plate 2 of the first pipe pile using a circumferential weld.

[0030] The connection between the pipe piles is achieved by engaging the movable nut 4 and the clamp 3, solving the problems of low efficiency and difficult quality control associated with traditional welded pile splicing. Compared with clamp-type connections, it avoids stress concentration at the screw points. This achieves the technical effect of both ensuring connection strength and improving construction efficiency.

[0031] Furthermore, the ferrule 3 is welded to the first pipe pile end plate 2, and the male connector 6 is welded to the second pipe pile end plate 7.

[0032] Specifically, the ferrule 3 is fixed to the first pipe pile end plate 2 by welding, and the male connector 6 is fixed to the second pipe pile end plate 7 by welding. As a preferred embodiment, welding can be performed using processes such as arc welding, laser welding, or friction welding. Arc welding is suitable for conventional construction environments, laser welding can achieve high-precision connections, and friction welding can effectively avoid the heat-affected zone. Before welding, the contact surfaces of the end plates need to be derusted and cleaned, and after welding, the weld quality needs to be inspected.

[0033] By welding the ferrule 3 and male connector 6 to the end plates of the two pipe piles, the connection strength and stability between the connector and the pipe piles can be ensured. The end plates, as prefabricated components, provide a reliable foundation for welding due to their flatness and dimensional accuracy. Furthermore, the welded connection method avoids the loosening problems that can occur with bolted connections and simplifies on-site construction procedures. While ensuring connection strength, it reduces adjustment steps during pile splicing, thus improving construction efficiency.

[0034] Furthermore, the movable nut 4 and the ferrule 3 are fitted with a tapered surface.

[0035] Furthermore, the taper between the movable nut 4 and the ferrule 3 is 1:n, where n is a positive number.

[0036] Furthermore, the taper is 1:5.

[0037] Specifically, the conical fit refers to the connection method in which the inner conical surface of the movable nut 4 and the outer conical surface of the ferrule 3 make mutual contact. The taper ratio 1:n indicates the inclination of the conical surfaces of the movable nut 4 and the ferrule 3; a larger n value results in a gentler conical surface, and a smaller n value results in a steeper conical surface. As a preferred embodiment, n can be set to 5, in which case the taper ratio is 1:5.

[0038] A taper of 1:5 indicates the inclination of the mating surfaces of the movable nut 4 and the ferrule 3; that is, for every 5 units of axial movement, the radial change is 1 unit. This taper can be achieved by machining a 1:5 tapered internal thread on the inner surface of the ferrule 3, and simultaneously machining a matching tapered external thread on the outer surface of the movable nut 4. Alternatively, a segmented tapered surface structure can be used, with multiple 1:5 tapered annular grooves within the ferrule 3 and corresponding tapered protrusions on the outer edge of the movable nut 4. Furthermore, n can be selected according to actual needs, such as 3, 8, or 10, to achieve different connection tightness and adjustment ranges. The tapered mating parts can be made of hardened alloy steel to improve wear resistance.

[0039] By setting a tapered fit, the movable nut 4 can drive the ferrule 3 to generate radial displacement when moving axially, thereby adjusting the tightness of the pipe pile connection. The tapered 1:n design ensures a fixed proportional relationship between the radial displacement and the axial movement, facilitating precise control of the connection gap. The tapered surface fit structure effectively solves the problem of insufficient joint strength caused by uneven end faces in traditional screw-lock connections, while also avoiding the inefficiency and safety hazards of welding processes.

[0040] For further details, please refer to... Figure 3 The maximum single-sided radial clearance δ between the ferrule 3 and the movable nut 4 is equal to the value of the axial movement distance H of the movable nut 4 divided by the taper n.

[0041] Specifically, the maximum single-sided radial clearance δ refers to the maximum allowable range of motion between the ferrule 3 and the movable nut 4 in the radial direction. The axial movement distance H of the movable nut 4 refers to the distance the movable nut 4 moves along the axis of the pipe pile. As a preferred embodiment, when the taper is 1:5, a 5mm axial movement of the movable nut 4 produces a 1mm radial clearance adjustment. By axially moving the movable nut 4, the radial clearance can be precisely controlled, ensuring connection stability.

[0042] By establishing a mathematical relationship between axial displacement and radial clearance, quantitative control of the clearance during pile splicing is achieved. Specifically, the conical mating structure converts axial force into radial constraint force, allowing the movable nut 4 to synchronously adjust the radial position of the ferrule 3 during axial movement. Furthermore, by pre-setting the taper parameters, the radial clearance value corresponding to a specific axial displacement can be directly calculated, thus avoiding errors from manual experience. This solves the problem of uncontrollable mating clearance caused by inconsistent installation heights in mechanical joints, improving pile splicing accuracy and connection strength.

[0043] Furthermore, the maximum single-sided radial clearance δ is 1 / 20 to 1 / 10 of the outer radius d of the first pipe pile 1.

[0044] By controlling δ within the range of 1 / 20 to 1 / 10 of d, the fit between the movable nut 4 and the ferrule 3 is ensured to have sufficient allowance for movement while effectively limiting radial misalignment. As a preferred embodiment, δ can be achieved by adjusting the ratio of the axial movement distance H of the movable nut 4 to the taper n, where the value of taper n directly affects the clearance size. For example, when n = 5, the formula for calculating δ is δ = H / 5, thus allowing the selection of the H value to meet the required range of δ based on actual needs.

[0045] By precisely controlling the radial clearance, the problem of insufficient tensile strength in existing screw-lock connections caused by uneven end faces or inconsistent installation heights is solved. Specifically, the rational setting of the clearance avoids stress concentration while ensuring the stability of the joint under load. While ensuring connection strength, it further improves construction efficiency and quality control, making it particularly suitable for engineering scenarios with high requirements for pipe pile connections, such as in soft soil areas.

[0046] Furthermore, the movable nut 4 is provided with a screw rod 5 for assisting in rotating the movable nut 4.

[0047] The tightening rod 5 is a metal rod, one end of which is fixed to the outer surface of the movable nut 4 by welding or threaded connection. The length of the tightening rod 5 is typically 300-500mm, and the diameter is designed to be 20-30mm according to the operating torque requirements. In specific implementations, the tightening rod 5 can be configured as a straight rod structure or an L-shaped bent structure, with the bending angle preferably 90°-120°. As another implementation, the surface of the tightening rod 5 can be provided with anti-slip texture or covered with a rubber layer to increase friction. In addition, 2-4 connection points between the tightening rod 5 and the movable nut 4 can be symmetrically arranged to form a multi-lever operating structure.

[0048] By adding a tightening rod 5, construction workers can apply rotational torque from a location far from the pipe pile joint, thus solving the problem of difficult nut tightening caused by limited operating space in traditional screw-lock connections. Specifically, after the first pipe pile 1 and the second pipe pile 8 are initially connected through the male and female connectors, the operator rotates the movable nut 4 by turning the tightening rod 5, thereby locking the conical surface of the ferrule 3 and the male connector 6. This design avoids direct contact with the rotating movable nut 4, improving operational safety and reducing the required operating force through the lever principle, effectively overcoming the precision control problem of manual tightening operations in confined spaces.

[0049] Furthermore, the second pipe pile 8 is provided with a fixing rod 9, and the fixing rod 9 is provided with a through hole, which is used to insert a ground anchor and fix the second pipe pile 8.

[0050] The fixing rod 9 can be fixed to the outer wall of the second pipe pile 8 by welding or bolting. Its material is preferably the same prestressed concrete steel bar or high-strength alloy steel as the pipe pile. The diameter of the through hole is designed according to the specifications of the ground anchor, usually 2-5 mm larger than the diameter of the ground anchor for easy insertion. As a preferred embodiment, 3-4 fixing rods 9 are evenly arranged along the circumference of the pipe pile, and the distance between each fixing rod 9 and the end of the pipe pile is 0.8-1.2 times the diameter of the pipe pile. Furthermore, the fixing rod 9 can be designed with an L-shaped or T-shaped cross-section to enhance bending resistance, and the inner wall of the through hole can be provided with anti-slip texture to increase friction with the ground anchor.

[0051] The axial stability problem after the pipe pile connection is effectively solved by the cooperation of the fixing rod 9 and the ground anchor. After the ground anchor is inserted into the through hole and driven into the soil, a three-point fixing system is formed: the movable nut 4 provides radial restraint, the male and female joints provide axial connection, and the ground anchor system resists lateral earth pressure. This ensures the tensile strength of the joint and avoids the loosening of the joint caused by soil disturbance in traditional mechanical connections. Compared with the solution that relies solely on welding or threaded locking, this structure significantly improves the lateral displacement resistance of the pipe pile in soft soil foundations. Moreover, during construction, there is no need to wait for the welding to cool down; the ground anchor can be directly inserted to complete the fixation, thus balancing construction efficiency and connection reliability.

[0052] Furthermore, a locking structure is provided between the movable nut 4 and the ferrule 3, which is used to limit the radial misalignment between the pipe piles.

[0053] The locking structure can be implemented in various ways. Specifically, the locking structure can be a mating structure of an annular groove on the inner wall of the movable nut 4 and an annular protrusion on the outer wall of the sleeve 3, achieving locking through axial movement. As a preferred embodiment, the annular groove and annular protrusion can have trapezoidal cross-sections to enhance the locking effect. Furthermore, the locking structure can also adopt a threaded engagement method, that is, an internal thread is provided on the inner wall of the movable nut 4 and an external thread is provided on the outer wall of the sleeve 3, achieving locking through thread engagement. In addition, the locking structure can also adopt a pin positioning method, that is, pin holes are provided at corresponding positions on the movable nut 4 and the sleeve 3, and radial positioning is achieved by inserting a pin.

[0054] By incorporating a locking structure, the potential radial misalignment problem after pipe pile connection is effectively resolved. Once the movable nut 4 and the retaining sleeve 3 achieve a conical fit, the locking structure restricts the relative radial displacement between them, thus ensuring connection stability. While maintaining the convenience of screw-lock connections, this significantly improves the joint's resistance to radial misalignment, preventing loosening caused by radial displacement.

[0055] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A quick connection prestressed pipe pile, characterized in that, Including the first and second pipe piles; One end of the first pipe pile is provided with a movable female connector, and one end of the second pipe pile is provided with a male connector. The first pipe pile and the second pipe pile are connected and fixed through the movable female connector and the male connector. The movable female connector includes a ferrule fixed to the end of the first pipe pile and a movable nut that mates with the ferrule.

2. The prestressed pipe pile according to claim 1, wherein, The ferrule is welded to the end plate of the first pipe pile, and the male connector is welded to the end plate of the second pipe pile.

3. The pre-stressed pipe pile according to claim 1, wherein, The movable nut and the ferrule are fitted with a tapered surface.

4. The pre-stressed pipe pile according to claim 3, wherein, The taper between the movable nut and the ferrule is 1:n, where n is a positive number.

5. The pre-stressed pipe pile according to claim 4, wherein, The taper is 1:

5.

6. The pre-stressed pipe pile as claimed in claim 3, wherein, The maximum single-sided radial clearance δ between the ferrule and the movable nut is equal to the value of the axial movement distance H of the movable nut divided by the taper n.

7. The pre-stressed pipe pile as claimed in claim 6, wherein, The maximum single-sided radial clearance δ is 1 / 20 to 1 / 10 of the outer radius d of the first pipe pile.

8. The pre-stressed pipe pile as claimed in claim 1, wherein, The movable nut is equipped with a screw rod to assist in rotating the movable nut.

9. The pre-stressed pipe pile as claimed in claim 1, wherein, The second pipe pile is provided with a fixing rod, and the fixing rod is provided with a through hole, which is used to insert a ground anchor and fix the second pipe pile.

10. The pre-stressed pipe pile as claimed in claim 1, wherein, A locking structure is provided between the movable nut and the ferrule, which is used to limit the radial misalignment between the pipe piles.

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