Adjustable sealing connection structure for large-diameter PCCP (prestressed concrete cylinder pipe) interface gap

Abstract

The utility model discloses an adjustable sealing connection structure for a large-diameter PCCP (prestressed concrete cylinder pipe) interface gap, and belongs to the technical field of pipeline installation. The structure comprises an inserting pipe and an adapting pipe, an inserting opening is formed in the end of the inserting pipe, a bellmouth is formed in the end of the adapting pipe, and the inserting opening is inserted into the bellmouth. A first rigid limiting tooth group is arranged on the inner wall of the bellmouth, and a second elastic limiting tooth group is arranged on the outer wall of the spigot and is meshed with the bellmouth to form a depth adjusting mechanism; the neck part of the socket is provided with a sealing structure consisting of a pair of positioning rings and sealing rings; a grouting seam is formed after the inserting opening is inserted into the bellmouth, the joint is coated with a grouting film, and the two ends of the grouting film are fastened through hoops and provided with grouting openings. By means of the structure, sealing connection and gap adjustment of the large-diameter PCCP in the gobi area can be effectively achieved, and the stability and sealing performance of pipeline connection are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of pipeline installation technology. More specifically, this utility model relates to an adjustable sealing connection structure for large-diameter PCCP pipe interfaces. Background Technology

[0002] In the field of pipeline engineering, especially when laying large-diameter PCCP pipes in the Gobi Desert, the connection and sealing of pipe joints are crucial. Due to the unique geographical environment of the Gobi Desert, such as strong winds and sandstorms and drastic temperature variations, traditional pipe joint connection methods present numerous problems. On the one hand, ordinary rigid connections are difficult to adapt to the thermal expansion and contraction of pipes caused by temperature differences in the Gobi Desert, easily leading to cracks at the joints, resulting in pipe leaks and affecting the normal operation of functions such as water transportation. On the other hand, conventional sealing structures are prone to wear and aging of sealing materials under wind and sand erosion, resulting in decreased sealing performance and an inability to maintain a good sealing effect for a long time. In addition, traditional connection structures make it difficult to precisely adjust the joint gaps during installation; gaps that are too large or too small will affect the overall performance and service life of the pipeline. In attempting to solve these problems, there is a dual challenge of ensuring the stability of the connection structure while achieving flexible gap adjustment and reliable sealing, and adapting to the harsh natural environment of the Gobi Desert, which places higher demands on both materials and structural design. Utility Model Content

[0003] This utility model provides an adjustable sealing connection structure for large-diameter PCCP pipe interfaces, which can be used for sealing connections of large-diameter water pipelines in harsh environments such as the Gobi Desert. It achieves multiple sealing effects, effectively prevents liquid leakage, and improves the sealing performance and stability of the pipeline connection.

[0004] To achieve these objectives and other advantages according to this utility model, a large-diameter PCCP pipe interface gap adjustable sealing connection structure is provided, including a plug pipe and a socket pipe. The plug pipe end is provided with a plug, and the socket pipe end is provided with a socket. The plug is inserted into the socket. The inner wall of the socket is provided with a first rigid limiting tooth group along the circumferential direction. The first limiting tooth group includes a plurality of first rigid limiting teeth arranged along the axial direction. The outer wall of the plug is provided with a second elastic limiting tooth group along the circumferential direction. The second limiting tooth group includes a plurality of elastic second limiting teeth arranged along the axial direction. The first limiting tooth group and the second limiting tooth group mesh to form a depth adjustment mechanism.

[0005] The neck of the socket is provided with a sealing structure, which includes a pair of positioning rings and a sealing ring, with the sealing ring disposed between the pair of positioning rings;

[0006] The annular gap exposed after the spigot is inserted into the socket forms a grouting seam. The connection between the spigot and the socket is covered with a grouting membrane. Both ends of the grouting membrane are fastened with clamps. Grouting ports communicating with the grouting seam are opened on the grouting membrane.

[0007] Preferably, the clamp is a hand-tightened stainless steel clamp, including an annular belt, a locking bolt, and a wing nut. The two ends of the annular belt are connected by a locking mechanism, and the wing nut drives the annular belt to contract.

[0008] Preferably, a rubber ring is fitted inside the annular belt, and the rubber ring abuts against the grouting membrane.

[0009] Preferably, the first rigid limiting tooth has a guide slope on its front side in the insertion direction and a vertical locking surface on its rear side; the elastic second limiting tooth has a deformable slope that matches the guide slope and a locking step that corresponds to the vertical locking surface.

[0010] When the socket is inserted into the inlet, the guide slope compresses and deforms the slope, causing the elastic second limiting tooth to contract radially; when moving in the opposite direction, the vertical locking surface abuts against the locking step to form a mechanical interlock, and the contact surface of the locking step is parallel to the vertical locking surface.

[0011] Preferably, the end face of a positioning ring near the socket is provided with an axially extending annular anti-disengagement groove, and an anti-disengagement protrusion is provided at the corresponding position on the inner wall of the socket;

[0012] When the spigot is inserted into the socket, the anti-detachment protrusion engages with the anti-detachment groove to form an axial limit.

[0013] Preferably, one of the positioning rings, located away from the insertion port, has a weight-reducing hole along the axial direction.

[0014] This utility model has at least the following beneficial effects:

[0015] First, this application combines various sealing measures, including sealing structures, grouting joints and grouting membranes, and elastic retaining rings, to form a multi-layered sealing system. From the internal sealing ring at the interface to the external grouting seal, and then to the secondary seal of the elastic retaining ring, it comprehensively prevents liquid leakage, greatly improves the sealing performance of pipeline connections, and meets the stringent sealing performance requirements of the Gobi Desert region.

[0016] Secondly, the design of the depth adjustment mechanism and axial limiting structure not only enables flexible adjustment of the interface gap but also ensures the stability of the pipeline connection. The limiting tooth assembly can adjust the insertion depth according to actual needs, and structures such as anti-detachment protrusions and anti-detachment grooves prevent axial displacement of the pipeline, enabling the pipeline to maintain a reliable connection even under the complex environmental changes of the Gobi Desert region, reducing the risk of pipeline failure due to connection problems.

[0017] Third, the application of components such as hand-tightened stainless steel clamps simplifies the installation process, allowing for quick installation and tightening without the need for complex tools. Furthermore, the design of each component facilitates later inspection and maintenance; for example, the removal of the clamps allows for easy inspection and replacement of components such as the grouting membrane, thus improving the efficiency of pipeline construction and maintenance.

[0018] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the insertion pipe and receiving pipe of one technical solution of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of a socket insertion port according to one technical solution of this utility model;

[0021] Figure 3 for Figure 2 A magnified structural diagram of A. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0023] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0024] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the reagents and materials described are commercially available. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] For large-diameter PCCP pipe joint connections in the Gobi Desert region, it is necessary to address how to achieve adjustable joint gaps while ensuring good sealing performance and the stability of pipe connections in the harsh Gobi environment. For example... Figure 1-3 As shown, this utility model provides an adjustable sealing connection structure for a large-diameter PCCP pipe interface, including a plug pipe 1 and a receiving pipe 2. The plug pipe 1 has a plug end 13, and the receiving pipe 2 has a socket end 14. The plug pipe 1 and the receiving pipe 2 serve as the basic components for connection, and the plug end 13 of the plug pipe 1 and the socket end 14 of the receiving pipe 2 are the key structures for achieving the connection. A first rigid limiting tooth group 3 is arranged circumferentially inside the socket 14. The first limiting tooth group includes multiple first rigid limiting teeth arranged axially. A second elastic limiting tooth group 4 is arranged circumferentially on the outer wall of the plug end 13. The second limiting tooth group includes multiple elastic second limiting teeth arranged axially. It is made of a material with good elasticity, such as rubber or elastic plastic. The first limiting tooth group and the second limiting tooth group mesh to form a depth adjustment mechanism. Due to the elasticity of the second limiting teeth, during the insertion process, the second limiting teeth can undergo a certain radial deformation according to the insertion depth, thereby realizing the adjustment of the interface gap. For example, when it is necessary to adjust the gap size, the gap size can be precisely adjusted by controlling the depth of insertion of the spigot 13 into the socket 14 and utilizing the meshing relationship of the limiting tooth group.

[0026] The neck of the socket 13 is provided with a sealing structure, which includes a pair of positioning rings 5 ​​and a sealing ring 6. The positioning rings 5 ​​serve to fix and position the sealing ring 6, and the sealing ring 6 is the key component to achieve sealing. It is made of wear-resistant and corrosion-resistant sealing material, such as nitrile rubber. The sealing ring 6 is set between a pair of positioning rings 5, forming an effective sealing barrier to prevent liquid from leaking from the interface.

[0027] The annular gap exposed after the insertion port 13 is inserted into the socket 14 forms a grouting seam 7. The connection between the insertion pipe 1 and the socket pipe 2 is covered with a grouting membrane 8. The grouting membrane 8 is made of a material with good flexibility and sealing properties, such as polyethylene film. The two ends of the grouting membrane are fastened by clamps 9. The clamps 9 can be fastened by conventional methods, such as bolt fastening. A grouting port communicating with the grouting seam 7 is opened on the grouting membrane 8. Grout can be injected into the grouting seam 7 through the grouting port to further enhance the sealing of the joint.

[0028] During operation, when the spigot 13 is inserted into the socket 14, the interaction of the limiting teeth first achieves initial positioning and gap adjustment. Then, the sealing structure plays a role in initial sealing. Finally, grout is injected through the grouting port. With the wrapping of the grouting membrane 8, the grout fills the grouting gap 7, forming a more reliable sealing layer, thereby achieving adjustable gap and reliable sealing of the entire interface.

[0029] In the above technical solution, a depth adjustment mechanism is formed by the meshing of the first rigid limiting tooth group 3 and the second elastic limiting tooth group 4, which can flexibly adjust the insertion depth of the spigot 13 and the socket 14 to meet the gap adjustment requirements under different working conditions. The cooperation between the sealing structure and the grouting joint 7 and the grouting membrane 8 achieves multiple sealing effects, effectively preventing liquid leakage, improving the sealing performance and stability of the pipeline connection, and adapting to the complex environment of the Gobi Desert region.

[0030] To further address the convenience and reliability issues of the fastening method at both ends of the grouting membrane 8, another technical solution proposes a hand-tightened stainless steel clamp 9, comprising an annular band, locking bolts, and wing nuts. The two ends of the annular band are connected by a locking mechanism, and the wing nuts drive the annular band to contract. The annular band, made of stainless steel, is characterized by high strength and corrosion resistance, enabling long-term use in the harsh Gobi Desert environment. The two ends of the annular band are connected by locking bolts, and the wing nuts cooperate with the locking bolts to drive the annular band to contract. During installation, the installer only needs to manually rotate the wing nuts to move the locking bolts, causing the annular band to gradually contract, thereby fastening both ends of the grouting membrane 8. This hand-tightened design eliminates the need for other complex tools, making operation simple and convenient, and greatly improving installation efficiency. Simultaneously, the stainless steel material ensures that the clamp 9 is not prone to rust or damage during long-term use, ensuring a stable and reliable fastening effect. Even in harsh environments such as wind and sand erosion and temperature fluctuations, it can maintain effective fastening of the grouting membrane 8, preventing loosening of the grouting membrane 8 and subsequent grout leakage, thus ensuring the sealing of the entire connection structure.

[0031] To further address the issue of enhancing the seal between the clamp 9 and the grouting membrane 8 and preventing grout leakage, another technical solution involves a rubber ring 10 fitted inside the annular belt. When the clamp 9 is tightened, the rubber ring 10 presses against the grouting membrane 8 under the pressure of the annular belt. The rubber ring 10, with its excellent elasticity, effectively fills the gap between the annular belt and the grouting membrane 8, enhancing the seal between them, preventing grout leakage during grouting, and ensuring both the grouting effect and the sealing of the pipeline connection.

[0032] To further achieve a smoother insertion process and more reliable mechanical interlocking to prevent pipe joint loosening, in another technical solution, the front side of the first rigid limiting tooth in the insertion direction is a guide slope, and the rear side is a vertical locking surface. The guide slope is designed to guide the elastic second limiting tooth to deform smoothly when the spigot 13 is inserted into the socket 14. The elastic second limiting tooth is provided with a deformation slope that matches the guide slope and a locking step that corresponds to the vertical locking surface.

[0033] When the spigot 13 is inserted into the socket 14, the guiding inclined surface of the first rigid limiting tooth and the deformable inclined surface of the elastic second limiting tooth come into contact with each other. As the spigot 13 penetrates deeper, the guiding inclined surface compresses the deformable inclined surface, causing the elastic second limiting tooth to contract radially, thereby reducing the insertion resistance and allowing the spigot 13 to be inserted into the socket 14 more smoothly. When moving in the opposite direction, the vertical locking surface abuts against the locking step to form a mechanical interlock. The contact surface of the locking step is parallel to the vertical locking surface. Because the contact surface of the locking step is parallel to the vertical locking surface, the two can provide greater friction when they abut, effectively preventing the pipe joint from loosening.

[0034] In the above technical solution, the guiding inclined surface of the first rigid limiting tooth cooperates with the deformable inclined surface of the elastic second limiting tooth. When the spigot 13 is inserted into the socket 14, the elastic second limiting tooth can smoothly retract radially, reducing the insertion resistance and achieving smooth insertion. The contact between the vertical locking surface and the locking step forms a firm mechanical interlock, effectively preventing the pipe joint from loosening due to external forces and improving the reliability of the connection structure.

[0035] To further address the issue of how to enhance the axial restraint between the spigot 13 and the socket 14 and prevent axial displacement of the pipeline during use, another technical solution is proposed, in which an axially extending annular anti-detachment groove 11 is provided on the end face of a positioning ring 5 near the spigot 13, and an anti-detachment protrusion 12 is provided at a corresponding position on the inner wall of the socket 14. The shapes of the anti-detachment protrusion 12 and the anti-detachment groove are matched.

[0036] When the socket 13 is inserted into the socket 14, the elastic second limiting tooth is slightly deformed when it contacts the elastic second limiting tooth and then passes through. The annular anti-disengagement groove 11 on the positioning ring 5 gradually approaches the axial anti-disengagement protrusion 12 on the inner wall of the socket 14 until it is inserted into the position. The anti-disengagement protrusion 12 is then engaged in the anti-disengagement groove to form an axial limit.

[0037] In the above technical solution, the annular anti-detachment groove 11 on the positioning ring 5 cooperates with the axial anti-detachment protrusion 12 on the inner wall of the socket 14. When the spigot 13 is inserted into the socket 14, the anti-detachment protrusion 12 is engaged in the anti-detachment groove, forming an effective axial limit, which restricts the displacement of the pipeline in the axial direction, ensures the stability of the pipeline during operation, and extends the service life of the pipeline.

[0038] To further address the issue of the large size and weight of the positioning ring 5, which increases the overall weight of the pipeline, an alternative technical solution involves an axial weight-reduction hole on one of the positioning rings 5 ​​furthest from the spigot 13. This reduces the weight of the positioning ring 5, allowing it to better adapt to thermal expansion and contraction caused by environmental factors such as temperature changes, providing some deformation space, and ensuring the structural stability of the positioning ring 5.

[0039] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of this utility model will be readily apparent to those skilled in the art.

[0040] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A large-diameter PCCP pipe interface gap adjustable sealing connection structure, comprising a plug pipe and a socket pipe, wherein the plug pipe end is provided with a plug, and the socket pipe end is provided with a socket, the plug being inserted into the socket, characterized in that, The inner wall of the socket is provided with a first rigid limiting tooth group along the circumferential direction. The first limiting tooth group includes a plurality of first rigid limiting teeth arranged along the axial direction. The outer wall of the insertion is provided with a second elastic limiting tooth group along the circumferential direction. The second limiting tooth group includes a plurality of elastic second limiting teeth arranged along the axial direction. The first limiting tooth group and the second limiting tooth group mesh to form a depth adjustment mechanism. The neck of the socket is provided with a sealing structure, which includes a pair of positioning rings and a sealing ring, with the sealing ring disposed between the pair of positioning rings; The annular gap exposed after the spigot is inserted into the socket forms a grouting seam. The connection between the spigot and the socket is covered with a grouting membrane. Both ends of the grouting membrane are fastened with clamps. Grouting ports communicating with the grouting seam are opened on the grouting membrane.

2. The adjustable sealing connection structure for large-diameter PCCP pipe interfaces according to claim 1, characterized in that, The clamp is a hand-tightened stainless steel clamp, which includes an annular belt, a locking bolt, and a wing nut. The two ends of the annular belt are connected by a locking mechanism, and the wing nut drives the annular belt to contract.

3. The adjustable sealing connection structure for large-diameter PCCP pipe interfaces according to claim 2, characterized in that, A rubber ring is fitted inside the annular belt, and the rubber ring abuts against the grouting membrane.

4. The adjustable sealing connection structure for large-diameter PCCP pipe interfaces according to claim 1, characterized in that, The first rigid limiting tooth has a guide slope on its front side in the insertion direction and a vertical locking surface on its rear side; the elastic second limiting tooth has a deformable slope that matches the guide slope and a locking step that corresponds to the vertical locking surface. When the socket is inserted into the inlet, the guide slope compresses and deforms the slope, causing the elastic second limiting tooth to contract radially; when moving in the opposite direction, the vertical locking surface abuts against the locking step to form a mechanical interlock, and the contact surface of the locking step is parallel to the vertical locking surface.

5. The adjustable sealing connection structure for large-diameter PCCP pipe interfaces according to claim 1, characterized in that, One of the positioning rings near the socket has an axially extending annular anti-dislodgement groove on its end face, and an anti-dislodgement protrusion is provided on the inner wall of the socket at the corresponding position. When the spigot is inserted into the socket, the anti-detachment protrusion engages with the anti-detachment groove to form an axial limit.

6. The adjustable sealing connection structure for large-diameter PCCP pipe interfaces according to claim 5, characterized in that, One of the positioning rings, located away from the insertion port, has a weight-reducing hole along its axial direction.

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