A socket-type composite jacking pipe

Abstract

This utility model relates to the field of composite pipeline technology, and in particular to a socket-type composite jacking pipe, aiming to solve the technical problem that existing composite jacking pipes are prone to deformation, buckling, or even structural damage at the connection when subjected to high-intensity axial jacking forces. The composite jacking pipe includes a pipe body with a socket at one end and a spigot at the other end. A high-strength insert is provided at the end of the pipe body near the spigot. The pipe body is composed of a composite structure and a skeleton structure. One end of the insert is directly connected to the skeleton structure to form a connection part. The composite structure covers the skeleton structure to form an integral structure. This utility model effectively transfers the axial load to the skeleton structure through the rigid connection between the insert and the skeleton, significantly enhancing the compressive strength and overall stability of the spigot end, avoiding end face buckling, and ensuring the sealing performance and construction safety of the pipeline connection.

Description

Technical Field

[0001] This utility model relates to the field of composite pipeline technology, and in particular to a socket-type composite jacking pipe. Background Technology

[0002] With the rapid development of urban infrastructure construction, trenchless pipe jacking technology has been widely used due to its minimal impact on surface traffic and the environment. Among the many pipe materials used in pipe jacking, steel-reinforced polyethylene composite pipe combines the high strength of steel with the corrosion resistance of plastic, making it an ideal material for sewage and water supply. This type of pipe typically uses a socket connection method to facilitate rapid assembly and jacking construction in narrow underground spaces.

[0003] However, in actual pipe jacking projects, especially in long-distance or complex geological conditions, the pipe connection points (i.e., the socket and spigot joints) are the weakest links in the entire pipeline structure. Pipe jacking construction mainly relies on the huge axial thrust generated by the main jacking cylinder or intermediate jacking stations to advance the pipeline forward. This huge axial load is mainly borne by the contact end faces between pipe sections.

[0004] In current technologies, traditional socket-type composite pipe jacking often struggles to maintain structural stability at the spigot end when subjected to high-intensity axial jacking forces. During construction, deformation, buckling, and even structural damage frequently occur at the pipe end connection. Such structural failures at the connection not only reduce the sealing performance between pipes and cause leakage, but in severe cases, they can even prevent the pipe jacking operation from continuing, posing a significant challenge to the safety and efficiency of the project. Utility Model Content

[0005] The main purpose of this utility model is to provide a socket-type composite jacking pipe, which aims to solve the problem of low connection strength of composite jacking pipes in the prior art.

[0006] To achieve the above objectives, this utility model provides a socket-type composite jacking pipe. The composite jacking pipe includes a pipe body, one end of which is provided with a socket and the other end with a spigot. An insert is provided at the end of the pipe body near the spigot. The pipe body includes a composite structure and a skeleton structure. One end of the insert is connected to the skeleton structure to form a connecting part. The composite structure covers the skeleton structure to form an integral structure. The composite jacking pipe is connected to the socket of an adjacent composite jacking pipe through the spigot.

[0007] Optionally, the end of the insert away from the skeleton structure extends out of the composite structure to form a connecting protrusion, the outer wall of which mates with the inner wall of the socket of the adjacent composite top pipe.

[0008] Optionally, the inner wall of the socket is provided with a connecting groove, and a sealing ring is provided in the connecting groove.

[0009] Optionally, the outer periphery of the skeleton structure is provided with a plurality of through holes to form a perforated mesh structure.

[0010] Optionally, the composite structure has a gradient density structure that increases sequentially from the outside to the inside along the thickness direction of the composite jacking pipe wall.

[0011] Optionally, the outer diameter of the insert decreases sequentially in the direction away from the connecting portion, and the inner diameter of the socket decreases sequentially in the direction closer to the connecting portion.

[0012] Optionally, the composite structure has a pin on the side near the socket along the axial direction of the composite jacking pipe, and a socket on the side near the socket of the composite structure, and the pin engages with the socket of the adjacent composite jacking pipe.

[0013] Optionally, the composite jacking pipe further includes a connecting structure disposed within the connecting groove of the socket, the connecting structure being used to maintain locking of the connecting protrusion when the spigot and the socket are connected.

[0014] Optionally, the connection structure includes a plurality of latches, which are movably disposed within the connection groove, and the plurality of latches are distributed in a circumferential array around the axis of the composite jacking pipe.

[0015] Optionally, the movable end of the latch is provided with a plastic part, and the plastic part is in a compressed state.

[0016] The beneficial effects that this utility model can achieve are as follows: This invention, through the direct connection of the insert and the skeleton, successfully transmits the enormous axial jacking force applied to the pipe end during construction directly to the high-strength skeleton network inside the pipe body. This greatly alleviates the problem of low connection strength in existing composite jacking pipe technologies and effectively prevents the pipe end from curling or plastic shrinkage under high stress, significantly improving the allowable jacking force value of the pipe. At the same time, the connecting protrusions extending from the insert, combined with the socket design, achieve automatic centering and guidance between pipe sections at the moment of insertion, greatly reducing construction difficulty and correction costs. In addition, combined with the gradient density composite structure covering and optimized sealing groove design, this structure ensures rigid force transmission while also taking into account the flexible shock absorption and multi-level seepage prevention functions at the connection. Even under complex geological settlement or long-distance jacking conditions, it can still maintain the geometric integrity of the interface and zero leakage, greatly ensuring the safe operation and construction efficiency of underground pipeline projects. Attached Figure Description

[0017] Figure 1 This is a schematic cross-sectional view of the composite jacking pipe in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the composite jacking pipe in Embodiment 1 of this utility model; Figure 3 This is a partial schematic diagram of the cross-sectional structure of the composite jacking pipe in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of a partial structure of the composite jacking pipe in Embodiment 1 of this utility model; Figure 5 This is another partial schematic diagram of the cross-sectional structure of the composite jacking pipe in Embodiment 1 of this utility model; Figure 6 This is a schematic diagram of another partial structure of the composite jacking pipe in Embodiment 1 of this utility model; Figure 7 This is a schematic diagram of the skeleton structure in Embodiment 1 of this utility model; Figure 8 This is a schematic diagram of the connection structure in Embodiment 2 of this utility model; Figure 9 Appendix of this utility model Figure 8 A magnified structural diagram of A in the diagram.

[0018] Figure label: 1-Socket, 2-Seal, 3-Insert, 4-Composite structure, 5-Skeleton structure, 6-Connecting part, 7-Connecting protrusion, 8-Connecting groove, 9-Connecting structure, 10-Lock, 11-Plastic part, 12-Sealing ring.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] 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.

[0022] 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.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are 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 with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] Example 1: Please refer to the attached document as well. Figures 1 to 7 This embodiment provides a socket-type composite jacking pipe. The composite jacking pipe includes a pipe body, one end of which is provided with a socket 1 and the other end with a spigot 2. An insert 3 is provided at the end of the pipe body near the spigot 2. The pipe body includes a composite structure 4 and a skeleton structure 5. One end of the insert 3 is connected to the skeleton structure 5 to form a connecting part 6. The composite structure 4 covers the skeleton structure 5 to form an integral structure. The composite jacking pipe is connected to the socket 1 of an adjacent composite jacking pipe through the spigot 2.

[0025] During trenchless pipe jacking construction, the socket connection structure 9 of the steel-reinforced polyethylene composite pipe faces structural stability challenges due to the axial thrust generated by the main jacking cylinder or intermediate stations. In particular, the end of the socket 2 is prone to local buckling and plastic deformation under continuous load, resulting in loss of fit accuracy of the connection end face, significant deterioration of sealing performance, and in turn, leakage, which forces the jacking operation to be interrupted, affecting the overall structural integrity of the pipeline and the continuity of construction.

[0026] Based on the above problems, this embodiment provides a socket-type composite jacking pipe, the core of which lies in the structure of the pipe body and its connection method. The main body of the composite jacking pipe is a pipe body, which is constructed with a socket 1 and a spigot 2 at both ends. Specifically, one end of the pipe body is made into a socket 1, and its inner diameter is designed to accommodate the spigot 2 of the adjacent pipe body; while the other end of the pipe body is made into a spigot 2, and its outer diameter is designed to be able to be inserted into the socket 1 of the adjacent pipe body. This socket-type design allows for quick and convenient connection between pipe sections. For example, the pipe sections can be connected by a simple push-in or press-in method. In one implementation, the socket 1 and the spigot 2 can be designed to have straight mating surfaces, relying on the elasticity of the material itself or an externally applied sealant to achieve connection and sealing.

[0027] To enhance the strength of the tube body in the connection area, especially under axial jacking force, an insert 3 is provided at the end of the tube body near the spigot 2. The insert 3 can be constructed as an annular or cylindrical structure and is embedded or fixed (welded) inside or outside the spigot 2 area of ​​the tube body. For example, the insert 3 can be made of a high-strength metal material, formed by machining, and placed on the inner or outer wall of the end of the spigot 2 of the tube body to provide additional support and compressive strength. In practical use, cast iron can be used. In another implementation, the insert 3 can be made of a polymer material by injection molding and fused or bonded to the tube body material.

[0028] The pipe body is composed of a composite structure 4 and a skeleton structure 5. The skeleton structure 5 is usually made of a material with high strength and rigidity, such as metal mesh, metal spiral ribbon or metal pipe. As the main load-bearing component of the pipe body, the skeleton structure 5 provides resistance to compression, tension and bending. The composite structure 4 is usually made of polymer materials (such as polyethylene, polypropylene, etc.). Its function is to cover the skeleton structure 5 and provide corrosion resistance, wear resistance, insulation and a certain sealing performance. For example, the skeleton structure 5 can be welded from steel wire mesh, while the composite structure 4 is covered on the outside of the steel wire mesh by extrusion molding or winding molding.

[0029] When traditional socket-type composite jacking pipes are subjected to high-intensity axial jacking forces, the end of the socket 2 is prone to deformation, buckling, or even damage to the connection structure 9 due to its weak structure, which in turn leads to sealing failure and construction interruption.

[0030] This embodiment effectively enhances the local strength and overall stability of the end of the socket 2 by setting an insert 3 at one end of the pipe body near the socket 2 and connecting one end of the insert 3 to the skeleton structure 5 to form a connection part 6. Compared with the prior art where the end of the socket 2 is supported by only a single material or simple structure, the connection part 6 formed by the insert 3 and the skeleton structure 5 in this embodiment can more effectively disperse and bear the huge axial load generated during the jacking process. For example, in a pipe jacking project, when the jacking force is applied to the end face of the pipe section, the synergistic effect of the insert 3 and the skeleton structure 5 enables the end of the socket 2 to maintain its structural integrity, avoiding the end face buckling and connection failure common in traditional solutions.

[0031] In this embodiment, the end of the insert 3 away from the skeleton structure 5 extends out of the composite structure 4 to form a connecting protrusion 7, and the outer wall of the connecting protrusion 7 mates with the inner wall of the socket 1 of the adjacent composite top pipe.

[0032] The aforementioned structure extends the insert 3 away from the skeleton structure 5 into the composite structure 4, forming a clearly defined connecting protrusion 7. The outer wall of this connecting protrusion 7 mates with the inner wall of the socket 1 of the adjacent composite jacking pipe, significantly improving the stability and reliability of the jacking pipe connection. When the spigot 2 of one composite jacking pipe is inserted into the socket 1 of an adjacent composite jacking pipe, the precise fit between the outer wall of the connecting protrusion 7 and the inner wall of the socket 1 effectively guides the spigot 2 into the socket 1, achieving rapid and accurate alignment. This mating mechanism not only provides solid physical support for the jacking pipe connection, effectively resisting the axial thrust generated during construction and preventing misalignment or deformation at the connection, but also creates a controlled mating gap or contact surface between the connecting protrusion 7 and the inner wall of the socket 1, providing an ideal working interface for any subsequent sealing structures, thus ensuring the sealing performance of the connection. This structural design overcomes the instability and leakage problems that may occur in traditional simple socket connections under high loads and with high sealing requirements, making the overall connection of the composite jacking pipe more robust and reliable.

[0033] In this embodiment, the inner wall of the socket 1 is provided with a connecting groove 8, and a sealing ring 12 is provided in the connecting groove 8.

[0034] Understandably, by providing a connecting groove 8 on the inner wall of the socket 1 and placing a sealing ring 12 within this groove 8, when the spigot 2 of the composite jacking pipe is connected to the socket 1 of an adjacent composite jacking pipe, the connecting protrusion 7 on the spigot 2 is pushed into the socket 1. At this time, the outer wall of the connecting protrusion 7 contacts the sealing ring 12 on the inner wall of the socket 1. Since the sealing ring 12 is pre-placed within the connecting groove 8, it undergoes elastic deformation due to radial compression during the insertion of the connecting protrusion 7. This deformation causes the sealing ring 12 to fit tightly against the outer wall of the connecting protrusion 7 and the inner wall of the connecting groove 8, thereby forming a reliable sealing barrier between the connecting protrusion 7 and the socket 1.

[0035] In this embodiment, the outer periphery of the skeleton structure 5 is provided with a plurality of through holes to form a perforated mesh structure.

[0036] Understandably, the skeleton structure 5, as the main load-bearing and shaping component of the composite pipe jacking system, allows the composite material to fully penetrate and fill these through-holes during the casting or covering of the composite structure 4. After the composite material cures inside the pores, it forms a tight mechanical interlock with the skeleton structure 5, rather than a simple surface bond. This interlocking mechanism greatly increases the interface area and shear resistance between the composite structure 4 and the skeleton structure 5, effectively preventing interlayer delamination that may occur during jacking or use.

[0037] In this embodiment, the composite structure 4 has a gradient density structure that increases sequentially from the outside to the inside along the thickness direction of the composite jacking pipe wall.

[0038] It should be noted that a "gradient density structure" refers to a composite material whose density exhibits a continuous or graded change along the thickness of the pipe wall. Specifically, the density of the material gradually increases from the outer surface of the pipe wall to the inner surface. This structure aims to optimize the distribution of the material's mechanical properties, enabling it to better adapt to the different stress environments on the inner and outer sides of the jacking pipe. There are several ways to achieve this gradient density structure; for example, it can be achieved through layered winding or by injecting molten polyethylene through a side gate during the molding process of composite structure 4.

[0039] In both embodiments, the outer diameter of the insert 3 decreases sequentially along the direction away from the connecting part 6, and the inner diameter of the socket 1 decreases sequentially along the direction closer to the connecting part 6.

[0040] It should be noted that by designing the insert 3 of the socket-type composite jacking pipe with its outer diameter decreasing sequentially away from the connecting part 6, and the inner diameter of the socket 1 decreasing sequentially towards the connecting part 6, the tapered outer surface of the insert 3 and the tapered inner surface of the socket 1 can achieve progressive contact and fit when the spigot 2 is inserted into the socket 1. When the spigot 2 of an adjacent composite jacking pipe is pushed into the socket 1, the tapered structure of the insert 3 can effectively guide the spigot 2 into the socket 1, achieving self-centering. As the spigot 2 goes further in, the gap between the insert 3 and the socket 1 gradually decreases, eventually forming a tight fit.

[0041] In this embodiment, a pin is provided on the side of the composite structure 4 near the socket 2 along the axial direction of the composite jacking pipe, and an insertion hole is provided on the side of the composite structure 4 near the socket 1. The pin engages with the insertion hole of the adjacent composite jacking pipe.

[0042] Understandably, when the spigot 2 of a composite jacking pipe is inserted into the socket 1 of an adjacent composite jacking pipe, the pin on the composite structure 4 located on the side of the spigot 2 will align with and insert into the insertion hole on the side of the composite structure 4 on the side of the socket 1 of the adjacent composite jacking pipe. This mechanical interlocking of the pin and the insertion hole provides an additional axial and radial fixing point on top of the socket connection. The insertion of the pin effectively restricts the relative axial movement of the jacking pipes, preventing the connection from coming undone under tension. At the same time, the tight fit between the pin and the insertion hole also restricts the relative rotation between the jacking pipes, ensuring the overall stability and directional consistency of the pipeline laying. In this way, even in complex construction environments or long-term operation, the strength and reliability of the connection can be maintained, significantly improving the pull-out resistance and torsional resistance of the jacking pipe connection.

[0043] Example 2: As attached Figure 8 , Figure 9 As shown, in this embodiment, the composite jacking pipe further includes a connecting structure 9, which is disposed in the connecting groove 8 of the socket 1. The connecting structure 9 is used to lock the connecting protrusion 7 when the spigot 2 is connected to the socket 1.

[0044] In this embodiment, the connecting structure 9 includes a plurality of latches 10, which are movably disposed within the connecting groove 8, and the plurality of latches 10 are arranged in a circumferential array around the axis of the composite jacking pipe.

[0045] In this embodiment, the movable end of the latch 10 is provided with a plastic part 11, and the plastic part 11 is in a compressed state.

[0046] It is understandable that by integrating the connecting structure 9 within the connecting groove 8 of the socket 1, and by having the connecting structure 9 lock the connecting protrusion 7 when the spigot 2 is connected to the socket 1, mechanical reinforcement of the composite jacking pipe connection is achieved. When the spigot 2 of the composite jacking pipe is inserted into the socket 1 of an adjacent composite jacking pipe, the connecting protrusion 7 enters the connecting groove 8 area of ​​the socket 1. At this time, the connecting structure 9 is activated (e.g., through mechanical triggering when the spigot 2 is inserted or its own elastic reset), forming a mechanical engagement or clamping with the connecting protrusion 7. This engagement ensures that the connecting protrusion 7 is firmly fixed within the socket 1, effectively preventing the spigot 2 from dislodging from the socket 1 or undergoing relative displacement under external axial force, radial force, or vibration. Simultaneously, the sealing ring 12 within the connecting groove 8 continues to provide a fluid seal, while the connecting structure 9 provides the crucial mechanical locking function. Together, they ensure the overall integrity and long-term reliability of the composite jacking pipe connection.

[0047] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A socket composite push pipe, characterized in that The composite jacking pipe includes a pipe body, one end of which is provided with a socket and the other end with a spigot. An insert is provided at the end of the pipe body near the spigot. The pipe body includes a composite structure and a skeleton structure. One end of the insert is connected to the skeleton structure to form a connecting part. The composite structure covers the skeleton structure to form an integral structure. The composite jacking pipe is connected to the socket of an adjacent composite jacking pipe through the spigot.

2. A socket and spigot composite push pipe according to claim 1, wherein, The insert extends from the end away from the skeleton structure to form a connecting protrusion, the outer wall of which mates with the inner wall of the socket of the adjacent composite top pipe.

3. A spigot and socket composite push pipe according to claim 2, wherein, The inner wall of the socket is provided with a connecting groove, and a sealing ring is provided in the connecting groove.

4. A socket-type composite jacking pipe as described in claim 1, characterized in that, The outer periphery of the skeleton structure is provided with several through holes to form a perforated mesh structure.

5. A socket-type composite jacking pipe as described in claim 1, characterized in that, The composite structure has a gradient density structure that increases sequentially from the outside to the inside along the thickness direction of the composite jacking pipe wall.

6. A socket-type composite jacking pipe as described in claim 1, characterized in that, The outer diameter of the insert decreases sequentially away from the connecting part, and the inner diameter of the socket decreases sequentially towards the connecting part.

7. A socket-type composite jacking pipe as described in claim 1, characterized in that, The composite structure has a pin on the side near the socket along the axial direction of the composite jacking pipe, and a socket on the side near the socket. The pin engages with the socket of the adjacent composite jacking pipe.

8. A socket-type composite jacking pipe as described in claim 3, characterized in that, The composite jacking pipe also includes a connecting structure, which is disposed in the connecting groove of the socket and is used to lock the connecting protrusion when the spigot and the socket are connected.

9. A socket-type composite jacking pipe as described in claim 8, characterized in that, The connection structure includes several latches, which are movably disposed within the connection groove, and the latches are arranged in a circumferential array around the axis of the composite jacking pipe.

10. A socket-type composite jacking pipe as described in claim 9, characterized in that, The movable end of the latch is provided with a plastic part, and the plastic part is in a compressed state.

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