A large diameter ductile cast iron pipe socket joint structure

Abstract

The application relates to the technical field of large pipeline construction, and discloses a large-diameter nodular cast iron pipe socket joint connecting structure, which comprises a pipeline socket end, a pipeline socket end, a receiving device, a socket end connecting device and a connecting auxiliary device; the receiving device is arranged at the pipeline socket end and is seamlessly welded with the pipeline socket end; the socket end connecting device comprises a connecting hoop which is divided into two parts, an upper part and a lower part; a water stop rubber ring is arranged on the inner side of the connecting hoop; and a water-swelling material is filled between the water stop rubber ring and the connecting hoop; one end of the socket end connecting device is in contact with the pipeline socket end, and the other end is in contact with the pipeline socket end. The connecting auxiliary device is consistent with the diameter of the pipeline socket end; an angle adjusting assembly is arranged on the outer wall of the side close to the pipeline socket end; one end of the connecting auxiliary device is provided with a protrusion; the protrusion is matched and clamped with a groove on the inner side of the receiving inner hoop; and the precise butt joint of the connecting auxiliary device and the receiving device is realized.

Description

Technical Field

[0001] This application relates to the field of large-scale pipeline construction technology, and in particular to a spigot and socket connection structure for large-diameter ductile iron pipes. It is applicable to the spigot and socket construction of pipeline projects using ductile iron pipes with a diameter of 2 meters or more. Background Technology

[0002] Ductile iron pipes, with their advantages of high strength, corrosion resistance, and good seismic performance, are widely used in municipal water supply and drainage, water conservancy and other pipeline engineering fields. Traditional ductile iron pipe socket connections mostly use a single rubber sealing ring or flange bolt fastening. However, in practical applications of large-diameter (2 meters and above) pipes, these connection structures have gradually revealed many shortcomings: Insufficient sealing: When large-diameter pipelines are transporting high-pressure media or encountering foundation settlement, the single rubber sealing ring is prone to sealing failure, causing media leakage; High installation difficulty: Traditional socket joints require extremely high alignment accuracy, often requiring multiple people to work together, making the construction process cumbersome and the overall construction efficiency low; High maintenance cost: Once leakage occurs at the joint, the repair process is complicated, and in most cases, it is necessary to cut the pipeline and replace the entire connecting component, resulting in resource waste and project delays.

[0003] Therefore, there is an urgent need to develop a large-diameter ductile iron pipe socket connection structure that takes into account sealing performance, ease of installation, and seismic stability in order to overcome the shortcomings of existing technologies. Utility Model Content

[0004] To address the aforementioned problems, this application provides a socket connection structure for large-diameter ductile iron pipes. By optimizing the component matching and mating relationships of the connection structure, efficient sealing and connection of large-diameter ductile iron pipes are achieved, while reducing installation difficulty and subsequent maintenance costs.

[0005] The present application provides a socket connection structure for large-diameter ductile iron pipes using the following technical solution: A large-diameter ductile iron pipe socket connection structure for connecting a pipe socket end and a pipe spigot end includes: a receiving device disposed on and seamlessly welded to the pipe socket end; the receiving device includes: a receiving clamp, an inner receiving clamp, and an inner clamp pre-tightening member; the inner receiving clamp is located inside the receiving clamp, and the space between the two is filled with a water-swellable material; the inner clamp pre-tightening member passes through the receiving clamp and acts on the inner receiving clamp, and a groove is formed on the inner side of the inner receiving clamp; a spigot end connecting device including upper and lower connecting clamps; a water-stop rubber ring is provided on the inner side of the connecting clamp, and water-swellable material is filled between the water-stop rubber ring and the connecting clamp; one end of the spigot end connecting device contacts the pipe spigot end, and the other end contacts the pipe socket end; a connecting auxiliary device with the same diameter as the pipe spigot end, an angle adjustment component is installed on the outer wall near the pipe socket end, and one end of the connecting auxiliary device is provided with a protrusion that fits and engages with the groove.

[0006] Furthermore, the angle adjustment component includes: an angle adjustment disk; a fine-tuning jack located at the center of one end of the angle adjustment disk, and at least four direction adjustment components arranged at equal angles along the circumference of the fine-tuning jack, each direction adjustment component corresponding to at least four adjustment directions.

[0007] Furthermore, the receiving clamp is an arc-shaped structure adapted to the outer wall of the pipe socket end, and the welding joint between the receiving clamp and the pipe socket end is a seamless weld.

[0008] Furthermore, a self-locking closed ring is provided on the inner side of the connecting clamp. The water-stop rubber ring, the self-locking closed ring, and the water-swellable material are sequentially preset in the inner cavity of the connecting clamp from the inside to the outside, forming a multi-seal structure.

[0009] Furthermore, the groove of the receiving inner clamp is interference-fitted with the protrusion of the connecting auxiliary device. By tightening the inner clamp preload, the receiving inner clamp can be squeezed, so that the groove of the receiving inner clamp and the protrusion of the connecting auxiliary device are tightly engaged, thereby achieving structural locking.

[0010] Furthermore, the receiving device and the connector end connection device are indirectly adapted to each other through a connection auxiliary device, and the receiving device and the connector end connection device form a double-layer seal.

[0011] Furthermore, the inner clamp pre-tightening component is configured as a pre-tightening bolt, and several pre-tightening bolts are arranged at equal angles along the circumference of the receiving clamp, which can be tightened simultaneously or in stages to achieve uniform force on the receiving inner clamp.

[0012] In summary, this application includes the following beneficial technical effects: By using the water-swellable material in the receiving device, combined with the water-stop rubber ring, self-locking closed ring and water-swellable material in the spigot end connection device to form a double-layer sealing structure, the leakage rate of large-diameter pipelines under high pressure conditions or foundation settlement can be significantly reduced, and the sealing stability can be significantly improved.

[0013] The angle adjustment component on the connection auxiliary device can flexibly adjust the docking angle. Combined with the precise snap-fit ​​structure of the inner clamp groove of the receiver and the protrusion of the connection auxiliary device, the difficulty of docking alignment is reduced, and most operations can be completed by a single person. Compared with the traditional connection method, the docking time is greatly shortened.

[0014] The clamp-type components in the connection structure can be disassembled and replaced independently without cutting off the entire pipeline. When leakage occurs at the interface or components age, repairs and replacements can be completed quickly, greatly reducing later maintenance costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a large-diameter ductile iron pipe socket connection structure according to the present invention.

[0016] Figure 2 This is a perspective view of a large-diameter ductile iron pipe socket connection structure according to the present invention.

[0017] Figure 3 This is an exploded view of a large-diameter ductile iron pipe socket connection structure according to this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1. Pipe socket end; 2. Pipe spigot end; 3. Receiving device; 4. Spigot end connecting device; 5. Connecting auxiliary device; 31. Receiving clamp; 32. Receiving inner clamp; 33. Groove; 34. Inner clamp pre-tightening component; 41. Connecting clamp; 42. Self-locking closed loop; 51. Angle adjustment disc; 52. Fine-tuning jack; 53. Direction adjustment component; 54. Protrusion. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0020] This application discloses a socket connection structure for large-diameter ductile iron pipes. (Refer to...) Figure 1 It includes: a pipe socket end 1, a pipe spigot end 2, a receiving device 3, a spigot end connecting device 4, and a connecting auxiliary device 5; the receiving device 3 is set on the pipe socket end 1 and seamlessly welded to it; the spigot end connecting device 4 includes a connecting clamp 41 divided into upper and lower parts, a water-stop rubber ring is provided on the inner side of the connecting clamp 41, and water-swellable material is filled between the water-stop rubber ring and the connecting clamp 41; one end of the spigot end connecting device 4 is connected to the pipe spigot end 2, and the other end is connected to the pipe socket end 1.

[0021] like Figure 2As shown, the connecting auxiliary device 5 has the same diameter as the pipe spigot end 2. An angle adjustment component is installed on the outer wall of the device 5 near the pipe socket end 1. One end of the connecting auxiliary device 5 has a protrusion that fits into the groove 33 on the inner side of the receiving inner clamp 32, achieving precise docking between the connecting auxiliary device 5 and the receiving device 3. The angle adjustment component includes an angle adjustment disc 51, a fine-tuning jack 52, and a direction adjustment component 53. The fine-tuning jack 52 is located at the center of one end of the angle adjustment disc 51. At least four direction adjustment components 53 are arranged at equal angles along the circumference of the fine-tuning jack 52, and each direction adjustment component 53 corresponds to at least four adjustment directions. The pipe docking angle can be flexibly adjusted by manipulating the direction adjustment components 53.

[0022] The connecting auxiliary device 5 is the core guiding and adjusting component that enables precise docking between the pipe spigot end 2 and the pipe socket end 1. Its core function is to guide and limit the docking and fine-tune the connection angle. Through the coordinated cooperation of mechanical structures, it solves the technical pain points of difficulty in alignment and difficulty in correcting angle deviations when docking large-diameter ductile iron pipes (2 meters and above).

[0023] like Figure 3 As shown, a protrusion 54 is provided on the inner wall of one end of the connecting auxiliary device 5. The size and curvature of the protrusion 54 are in an interference fit with the groove 33 on the inner side of the receiving inner clamp 32 in the receiving device 3. In the initial docking stage, the protrusion 54 is aligned with the groove 33 and initially inserted. The interference fit between the protrusion 54 and the groove 33 can limit the radial displacement of the connecting auxiliary device 5 and the pipe socket end 2. The axial length of the protrusion 54 is adapted to the depth of the groove 33. After insertion, it can avoid over-insertion or under-insertion of the pipe socket end 2 during the docking process, providing a stable foundation for subsequent angle adjustment and fastening. An angle adjustment assembly is installed on the outer wall of the connecting auxiliary device 5 near the pipe socket end 1. The direction adjustment component 53 is the core actuator for realizing the angle fine adjustment. The four direction adjustment components 53 are evenly distributed around the outer wall of the connecting auxiliary device 5, corresponding to the four directions of up, down, left, and right. Each direction adjustment component 53 is hinged to the telescopic rod of the fine adjustment jack 52.

[0024] During the actual adjustment process, when there is an angular deviation between the pipe spigot end 2 and the pipe socket end 1, the operator can control the direction adjustment component 53 in the corresponding position according to the direction of the deviation. When the telescopic rod of the direction adjustment component 53 extends or retracts, it simultaneously drives the connecting auxiliary device 5 and the pipe spigot end 2 to adjust the overall docking angle. After calibration, tighten the inner clamp pre-tightening component 34 of the receiving device 3, and squeeze the receiving inner clamp 32 to make the groove 33 and the protrusion 54 tightly engage, thereby achieving angle locking and ensuring the stability of the connection structure. The direction adjustment component 53 is set as an electric telescopic rod or a hydraulic cylinder.

[0025] In the above embodiment, a self-locking closed ring 42 is further provided on the inner side of the connecting clamp 41. The water-stop rubber ring, the self-locking closed ring 42 and the water-swellable material are sequentially preset in the inner cavity of the connecting clamp 41 from the inside to the outside to form a multi-seal structure, which can greatly improve the sealing performance at the interface.

[0026] The receiving device 3 includes a receiving clamp 31, an inner receiving clamp 32, and an inner clamp pretensioner 34. The inner receiving clamp 32 is located inside the receiving clamp 31, and the space between them is filled with a water-swellable material. The water-swellable material expands in volume upon contact with water, enhancing the sealing effect. The inner clamp pretensioner 34 passes through the receiving clamp 31 and acts on the inner receiving clamp 32 to adjust the clamping degree of the inner receiving clamp 32. A groove 33 is provided on the inner side of the inner receiving clamp 32 to provide a positioning basis for subsequent docking with the connecting auxiliary device 5.

[0027] As a further optimization of this application, the receiving clamp 31 is an arc-shaped structure adapted to the outer wall of the pipe socket end 1, and the welding joint between the receiving clamp 31 and the pipe socket end 1 is a seamless weld joint, ensuring the sealing performance and structural strength of the connection between the receiving device 3 and the pipe socket end 1.

[0028] As a further optimization of this application, the groove 33 of the receiving inner clamp 32 and the protrusion 54 of the connecting auxiliary device 5 are interference fit. By tightening the inner clamp preload 34, the receiving inner clamp 32 can be squeezed, so that the groove 33 of the receiving inner clamp 32 and the protrusion 54 of the connecting auxiliary device 5 are tightly engaged, thereby achieving structural locking and improving the stability of the overall connection structure.

[0029] As a further optimization of this application, the receiving device 3 and the socket end connection device 4 are indirectly adapted to each other through the connection auxiliary device 5. The receiving device 3 and the socket end connection device 4 form a double-layer seal, which can effectively reduce the risk of medium leakage.

[0030] As a further optimization of this application, the inner clamp pre-tightening member 34 is set as a pre-tightening bolt. Several pre-tightening bolts are arranged at equal angles along the circumference of the receiving clamp 31. In this embodiment, six are preferred. They can be tightened simultaneously or in stages to achieve uniform force on the receiving inner clamp 32 and avoid damage to the components caused by local stress concentration.

[0031] In actual use, during installation, the receiving device 3 is first seamlessly welded to the pipe socket end 1. Then, the water-stop rubber ring, self-locking closed ring 42, and water-swellable material are pre-installed inside the connecting clamp 41. The connecting clamp 41 is then fixed to the pipe spigot end 2 and the connecting auxiliary device 5. Subsequently, the protrusion of the connecting auxiliary device 5 is aligned with the groove 33 of the receiving inner clamp 32. The docking angle is adjusted using the angle adjustment component. After angle calibration, the pre-tightening bolts are tightened to ensure a tight fit between the protrusion 54 and the groove 33, completing the overall connection. Finally, the spigot end connecting device 4 and the receiving device 3 are docked and fixed with bolts to achieve overall assembly.

[0032] It is worth noting that the connecting auxiliary device 5 is a structure that assists in the connection of pipes. After the two pipe sections are connected, the connecting auxiliary device 5 can be disassembled by loosening the receiving inner clamp 32. This can ensure the pipe installation performance without affecting the flow performance of the pipe. After disassembly, the receiving inner clamp 32 can be tightened again or the receiving inner clamp 32 can be removed directly.

[0033] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A socket connection structure for large-diameter ductile iron pipes, used to connect the socket end and the spigot end of a pipe, characterized in that, include: A receiving device is installed at the pipe socket end and seamlessly welded thereto. The receiving device includes: a receiving clamp, a receiving inner clamp, and an inner clamp pretensioner. The receiving inner clamp is located inside the receiving clamp, and the space between the two is filled with water-swellable material. The inner clamp pretensioner passes through the receiving clamp and acts on the receiving inner clamp, and a groove is provided on the inner side of the receiving inner clamp. The spigot end connection device includes a connecting clamp divided into upper and lower parts. A water-stop rubber ring is provided on the inner side of the connecting clamp, and water-swellable material is filled between the water-stop rubber ring and the connecting clamp. One end of the spigot end connection device contacts the spigot end of the pipe, and the other end contacts the socket end of the pipe. A connecting auxiliary device with the same diameter as the pipe socket end is provided. An angle adjustment component is installed on the outer wall of the side near the pipe socket end. One end of the connecting auxiliary device is provided with a protrusion that fits and engages with the groove.

2. The socket connection structure for a large-diameter ductile iron pipe according to claim 1, characterized in that, The angle adjustment component includes: Angle adjustment dial; The fine-tuning jack is positioned at the center of one end of the angle adjustment disc; The directional adjustment components are provided at least four at equal angles along the circumference of the fine-tuning jack; The direction adjustment components correspond to at least four adjustment directions.

3. The socket connection structure for a large-diameter ductile iron pipe according to claim 1, characterized in that, The receiving clamp is an arc-shaped structure adapted to the outer wall of the pipe socket end, and the welding joint between the receiving clamp and the pipe socket end is a seamless weld.

4. The socket connection structure for a large-diameter ductile iron pipe according to claim 1, characterized in that, The inner side of the connecting clamp is also provided with a self-locking closed ring. The water-stop rubber ring, the self-locking closed ring and the water-swellable material are sequentially preset in the inner cavity of the connecting clamp from the inside to the outside to form a multi-seal structure.

5. The socket connection structure for a large-diameter ductile iron pipe according to claim 1, characterized in that, The groove of the receiving inner clamp is interference-fitted with the protrusion of the connecting auxiliary device. By tightening the inner clamp preload, the receiving inner clamp can be squeezed, so that the groove of the receiving inner clamp and the protrusion of the connecting auxiliary device are tightly engaged, thereby achieving structural locking.

6. The socket connection structure for a large-diameter ductile iron pipe according to claim 1, characterized in that, The receiving device and the connector end connection device are indirectly adapted to each other through a connection auxiliary device, and the receiving device and the connector end connection device form a double-layer seal.

7. The socket connection structure for a large-diameter ductile iron pipe according to claim 1, characterized in that, The inner clamp pre-tightening component is set as a pre-tightening bolt. Several pre-tightening bolts are arranged at equal angles along the circumference of the receiving clamp, which can be tightened simultaneously or in stages to achieve uniform force on the receiving inner clamp.

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