A pipe socket connection method with jacking and tension forces

Abstract

This application discloses a pipe socket connection method with jacking and tensile forces. Belonging to the field of concrete pipe technology, this structure enables simultaneous pushing and pulling operations in trenchless construction and effectively transmits longitudinal tensile force. The pipe socket connection method with jacking and tensile forces is characterized by comprising: a concrete pipe body with prestressed steel bars inside; a socket structure located at one end of the concrete pipe body; a spigot structure located at the end of an adjacent concrete pipe body, which interlocks with the socket structure; a rubber sealing ring located on the socket structure for flexible sealing; and a longitudinal tensile reinforcement structure comprising: at least three drag plates located on the outer periphery of the spigot structure, the drag plates being evenly arranged circumferentially and welded to the spigot structure and adjacent pipe bodies for transmitting longitudinal tensile force.

Description

Technical Field

[0001] This invention relates to the field of concrete pipe technology, specifically a pipe socket connection method with jacking force and tensile force. Background Technology

[0002] Urban underground drainage pipe networks are a crucial component of municipal infrastructure, and my country's existing pipe networks extensively utilize reinforced concrete socket pipes. Currently, these pipes commonly employ a socket joint with rubber sealing rings for connection. While this achieves good flexible sealing and adaptability to certain deformations, the interface design primarily focuses on pressure resistance and water sealing, offering almost no longitudinal tensile strength. With the increasing prevalence of trenchless construction technologies, especially in processes like pipe jacking and traction, pipelines must simultaneously withstand both jacking and traction forces from the rear and front to achieve simultaneous "pushing and pulling" construction, improving laying efficiency and accuracy. However, traditional socket joints, unable to effectively transmit longitudinal tensile force, severely limit the application of this construction method and also affect the integrity and reliability of pipelines laid in complex geological formations and curved sections.

[0003] Therefore, there is an urgent need to develop a pipe socket connection method with both jacking and pulling forces to solve the problems in the existing technology. Summary of the Invention

[0004] The purpose of this invention is to provide a pipe socket connection method with jacking force and tension force, which can realize simultaneous pushing and pulling operations in trenchless construction and effectively transmit longitudinal tension force. It has a simple structure and is easy to use, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A pipe socket connection method with jacking force and tension force includes: A concrete pipe body, wherein prestressed steel bars are provided inside the concrete pipe body; A socket structure is provided at one end of the concrete pipe body; The spigot structure is located at the end of another adjacent concrete pipe body and is inserted into the socket structure. A rubber sealing ring is provided on the socket structure to achieve a flexible seal; The longitudinal tensile reinforcement structure includes at least three drag plates disposed on the outer periphery of the socket structure. The drag plates are evenly arranged circumferentially and welded and fixed to the socket structure and adjacent pipe bodies to transmit longitudinal tensile force.

[0006] By adopting the above technical solution, a flexible seal is achieved through the socket and sealing ring, and the longitudinal tension during construction is effectively transferred to the concrete pipe body through the drag plate welded to the outer periphery of the socket. This allows the pipeline to withstand both jacking force and traction force at the same time, enabling simultaneous pushing and pulling operations in trenchless construction.

[0007] As a further aspect of the present invention, the concrete strength grade of the concrete pipe body is not lower than C80.

[0008] By adopting the above technical solutions and using high-strength concrete, the pipe body is guaranteed to have sufficient ring stiffness and compressive strength, and can withstand the large jacking force during construction as well as the external earth pressure and load during service.

[0009] As a further aspect of the present invention: the socket structure and the spigot structure are made of cast iron and are pre-embedded in the end of the concrete pipe body.

[0010] By adopting the above technical solution, the cast iron material has high mechanical strength and good durability. It is embedded in the end of the pipe to form an integral whole, providing a solid and reliable base for the welding of the socket seal and the drag plate.

[0011] As a further aspect of the present invention: the connection method is suitable for simultaneous jacking and traction operations in trenchless construction, and can withstand both jacking force and longitudinal tension simultaneously.

[0012] By adopting the above technical solution, the structural design enables the pipe interface to have both pressure-resistant sealing and tensile force transmission functions, thereby supporting the synchronous construction mode of "pull-forward and push-back", reducing forward resistance, and improving laying efficiency and hole accuracy.

[0013] As a further aspect of the present invention: a construction method for a pipe socket connection includes the following steps: S1: Prepare a concrete pipe body with a socket structure and a spigot structure; S2: Install a rubber sealing ring inside the socket structure; S3: Insert the spigot structure into the socket structure to complete the initial connection; S4: Arrange the drag plates symmetrically along the outer periphery of the socket structure, and weld and fix them to the socket structure and adjacent pipes piece by piece; S5: Inspect the welding quality and sealing performance, and complete the pipe connection.

[0014] By adopting the above technical solution, the method has clear steps. First, the socket seal is completed, and then a tensile connection is established by welding the drag plate. This ensures that the connection has both sealing performance and longitudinal force transmission capability, and the construction sequence is reasonable and reliable.

[0015] As a further aspect of the present invention: in step S4, the welding is performed by arc welding or gas shielded welding, and the weld is subjected to anti-corrosion treatment after welding.

[0016] By adopting the above technical solutions and using common welding processes, the connection strength and quality are controllable, and the anti-corrosion treatment enhances the durability of the welded joints in the buried environment, ensuring the reliability of long-term use.

[0017] As a further aspect of the present invention, the construction method is applicable to trenchless construction of municipal sewage, water supply, rainwater, gas, or power pipeline projects.

[0018] By adopting the above technical solution, the wide application scope of the present invention is clarified. Its connection method, which combines high rigidity, sealing and tensile strength, can meet the technical requirements of various municipal pipelines in trenchless construction.

[0019] As a further aspect of the present invention, the characteristic is that during the jacking construction process, a jacking force is applied from the rear while a traction force is applied from the front, thereby achieving synchronous "pull-pull" operation.

[0020] By adopting the above technical solution, the tensile strength of the pipe interface is utilized, and the combined force of the front traction and the rear jacking effectively reduces the friction during long-distance or curved jacking, thereby improving the controllability and efficiency of construction.

[0021] This invention is mainly applicable to prestressed high-strength concrete pipeline engineering, especially trenchless pipeline construction. It is suitable for trenchless construction of municipal sewage, water supply, rainwater, gas, and power pipeline projects, and is especially suitable for situations where the pipeline has high requirements for rigidity, tensile strength, and lateral strength. It can be used as an upgraded alternative to traditional pipe jacking technology.

[0022] Compared with the prior art, the beneficial effects of the present invention are: 1. Achieve synchronous push-pull operation: By welding a drag plate to the outer periphery of the socket, an independent rigid tensile force transmission path is created, enabling the interface to reliably bear the front traction force and the rear jacking force at the same time, meeting the requirements of synchronous construction of "front pull and rear push".

[0023] 2. Efficient transmission of longitudinal tensile force: The rigid connection formed by welding allows for direct transmission of tensile force, solving the problems of low force transmission efficiency and unreliability caused by the reliance on friction in traditional interfaces, and significantly improving tensile safety.

[0024] 3. Maintaining flexible sealing characteristics: The tensile structure is an external additional design that does not change the working mode of the socket body and the sealing ring, thus fully preserving the original flexible sealing and deformation adaptability of the interface.

[0025] 4. Simple structure and convenient construction: The main reinforcing components are standard steel plates, which can be installed by conventional welding without the need for complex equipment or precision processing, thus reducing construction difficulty and cost.

[0026] Other features and advantages of the present invention will be disclosed in detail in the following detailed description and accompanying drawings. Attached Figure Description

[0027] Figure 1 This is one of the overall structural schematic diagrams in an embodiment of the present invention; Figure 2 This is one of the overall structural schematic diagrams in an embodiment of the present invention; Figure 3 This is a front view of the overall structure in an embodiment of the present invention; Figure 4 This is one of the overall structural cross-sectional views in an embodiment of the present invention; Figure 5 This is one of the overall structural cross-sectional views in an embodiment of the present invention.

[0028] The attached figures are labeled as follows: 1. Concrete pipe body; 11. Prestressed steel bar; 2. Socket structure; 3. Spigot structure; 4. Rubber sealing ring; 5. Longitudinal tensile reinforcement structure; 51. Pulling plate; 511. Stress dispersion groove. Detailed Implementation

[0029] 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 some embodiments of the present invention, and not all embodiments. 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.

[0030] In this embodiment of the invention, a pipe socket connection method with jacking force and tensile force is described below. Figures 1 to 5 As shown, Preparation of pipe components: First, the high-strength prestressed concrete pipe body 1 used in this embodiment is prepared. The concrete pipe body 1 is made of high-performance concrete with a strength grade of not less than C80, and is cast using a centrifugal or vertical vibration process. Before concrete pouring, multiple high-strength prestressed steel bars 11 are arranged at intervals along the axial and circumferential directions within the steel reinforcement cage of the pipe body 1. After the concrete reaches the specified strength, the prestressed steel bars 11 are simultaneously tensioned using tensioning equipment such as hydraulic jacks. The tensioning control stress should meet the design and specification requirements. After tensioning, the ends of the prestressed steel bars 11 are anchored, and the anchorage area is treated with anti-corrosion and concrete sealing, thereby establishing an effective prestressing system within the concrete pipe body 1, giving it high compressive strength and circumferential stiffness, sufficient to withstand construction jacking forces and external soil loads.

[0031] When the concrete pipe body 1 is cast, a cast iron socket structure 2 needs to be accurately pre-embedded at one end. The socket structure 2 is a cylindrical component. One or more annular sealing grooves are provided on its inner side near the port. Correspondingly, a cast iron spigot structure 3 is pre-embedded at the corresponding end of the other section of the concrete pipe body 1. The spigot structure 3 is usually a cylindrical structure with a smooth outer wall or a conical structure with a guide bevel. Its dimensions need to be precisely matched with the inner cavity of the socket structure 2 to ensure smooth insertion and leave space for the sealing ring compression.

[0032] Pipe connection construction steps: Step 1: Install the sealing ring. Before connecting the pipes, carefully insert the rubber sealing ring 4 (usually an O-ring or wedge ring) into the sealing groove inside the socket structure 2.

[0033] Step Two: Socket Connection. Using hoisting equipment, smoothly move the pipe section to be connected, aligning the axis of the spigot structure 3 with the axis of the already positioned socket structure 2. Slowly advance the pipe section to be connected, smoothly inserting the spigot structure 3 into the socket structure 2 until the spigot end makes tight contact with the thrust shoulder inside the socket. During this process, the rubber sealing ring 4 is uniformly compressed, forming the first reliable flexible sealing barrier between the socket and spigot, allowing for slight angular deflection and displacement of the pipe joint to accommodate uneven settlement of the foundation.

[0034] Step 3: Installation and Welding of the Tensile Structure. Immediately after the socket joint is in place, install the longitudinal tensile reinforcement structure 5. This structure consists of multiple (usually 3, 6, or 8 pieces, determined according to pipe diameter and tensile requirements) drag strips 51 cut from steel plates. Temporarily attach these drag strips 51 evenly and symmetrically along the outer circumference of the socket structure 3. Adjust their position so that each drag strip 51 simultaneously covers the outer wall of the socket structure 3 and the corresponding area (or the pre-embedded steel connector) at the end of the already positioned concrete pipe body 1. Subsequently, using manual arc welding or CO2 gas shielded welding, firmly weld each drag strip 51 to the socket structure 3 and the subsequent pipe body. The welding should be continuous and full. After all drag strips 51 are welded, clean the weld area of ​​slag and apply an epoxy zinc-rich primer or other anti-corrosion material for corrosion protection.

[0035] Step 4: Quality Inspection. Conduct a comprehensive inspection of the joint, including visually inspecting the weld quality, measuring the weld dimensions, and performing a water pressure or air tightness test on the socket joint to ensure that the connection meets both tensile strength and sealing performance requirements.

[0036] Trenchless push-pull synchronous construction application: When this connection method is applied in trenchless construction scenarios such as pipe jacking and directional drilling traction, its working process is as follows: After construction begins, the jacking equipment (such as hydraulic jack assemblies) located in the working shaft applies a huge axial jacking force to the assembled pipeline system. This jacking force is transmitted forward sequentially through each concrete pipe section 1, overcoming the frictional resistance between the outer wall of the pipeline and the soil, and propelling the first pipe section forward. At the same time, the traction equipment (such as winches or hydraulic traction machines) located in the receiving shaft or in front of the pipeline is connected to the front end of the first pipe section through steel wire ropes, tie rods, and other connecting components, and applies a forward traction force synchronously.

[0037] At this point, the key stress point of the pipeline system lies in the joints between the pipe sections. Traditional pure socket joints cannot withstand this traction force. However, in this invention, the traction force borne by the first pipe section is directly transmitted to the drag plate 51 welded to the socket through its own spigot structure 3. The drag plate 51 then transmits the force to the socket structure 2 of the adjacent pipe section and the entire concrete pipe body 1. In this way, the tensile force is effectively transmitted backward section by section through the longitudinal tensile reinforcement structure 5 of each joint, and finally forms a resultant force with the jacking force. This synchronous "pull-pull-push" mode significantly reduces the total friction during long-distance jacking or curved jacking, and improves jacking efficiency, construction speed, and control accuracy of the design axis.

[0038] Application scope: The connection method and construction method of this invention are mainly applicable to trenchless pipeline projects with high requirements for pipeline rigidity, sealing performance, and axial stress resistance. Typical applications include, but are not limited to: sewage pipes and rainwater pipes in municipal drainage systems; water supply trunk lines in water supply projects; and sleeves or pipes requiring jacking construction in power, gas, and other pipeline corridor projects. It is particularly suitable for long-distance, curved pipe jacking projects crossing obstacles such as rivers, highways, and railways, or in complex strata such as soft soil and sand layers.

[0039] This invention provides a pipe socket connection method with jacking force and tension force, which can realize simultaneous pushing and pulling operations in trenchless construction and effectively transmit longitudinal tension force, with high reliability.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pipe socket connection method with jacking force and tensile force, characterized in that, include: Concrete pipe (1), the interior of which is provided with prestressed steel bars (11). A socket structure (2) is provided at one end of the concrete pipe body (1); The spigot structure (3) is located at the end of another adjacent concrete pipe (1) and is inserted into the socket structure (2); A rubber sealing ring (4) is provided on the socket structure (2) to achieve a flexible seal; The longitudinal tensile reinforcement structure (5) includes: at least three drag plates (51) disposed on the outer periphery of the socket structure (3), the drag plates (51) being evenly arranged in the circumferential direction and welded and fixed to the socket structure (3) and the end of the concrete pipe body (1) on the side where the socket structure (3) is located or to a steel connector pre-embedded at that end, for transmitting longitudinal tensile force. The drag plate (51) is an arc-shaped steel plate with its inner arc surface in contact with the outer wall of the socket structure (3) and its outer arc surface extending to the end surface of the concrete pipe (1). At least one stress dispersion groove (511) is provided in the extension section to reduce stress concentration in the welding area.

2. The pipe socket connection method with jacking force and tensile force according to claim 1, characterized in that, The concrete strength grade of the concrete pipe body (1) is not lower than C80.

3. The pipe socket connection method with jacking force and tensile force according to claim 1, characterized in that, The socket structure (2) and spigot structure (3) are made of cast iron and are embedded in the end of the concrete pipe.

4. The pipe socket connection method with jacking force and tensile force according to claim 1, characterized in that, The connection method transmits longitudinal tensile force through the longitudinal tensile reinforcement structure (5).

5. A pipe socket connection method with jacking force and tensile force according to claim 1, characterized in that, The axial projection of the drag plate (51) is radially offset from the anchorage area of ​​the prestressed steel bar (11) at the pipe end.

6. The pipe socket connection method with jacking force and tensile force according to claim 1, characterized in that, The surface of the welding area between the drag plate (51) and the concrete pipe (1) is covered with an anti-corrosion coating.

7. A pipe socket connection method with jacking force and tensile force according to claim 1, characterized in that, The depth of the stress dispersion groove (511) is 1 / 3 to 1 / 2 of the thickness of the drag sheet, the width is 2 to 5 mm, and the bottom of the groove is a rounded transition.

8. A construction method for a pipe socket connection as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1: Prepare a concrete pipe body (1) with a socket structure (2) and a spigot structure (3); S2: Install a rubber sealing ring (4) inside the socket structure (2); S3: Insert the spigot structure (3) into the socket structure (2) to complete the initial docking; S4: Arrange the drag pieces (51) symmetrically along the outer periphery of the socket structure (3), and weld them one by one to the socket structure (3) and the adjacent pipe body; S5: Inspect the welding quality and sealing performance, and complete the pipe connection.

9. The construction method according to claim 8, characterized in that, In step S4, welding is performed using electric arc welding or gas shielded welding, and the weld is treated with anti-corrosion measures after welding.

10. The construction method according to claim 8, characterized in that, During the jacking construction process, a jacking force is applied from the rear, while the traction force is simultaneously transmitted from the front through the longitudinal tensile reinforcement structure (5).

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