Nested structure for new to old pipe switching

Abstract

The application relates to the technical field of underground pipeline construction, in particular to a nesting structure for switching between new and old pipelines, which comprises an adapter shell and a plugging piece. The adapter shell has a cavity inside, and at least one new pipeline interface and at least one old pipeline interface are arranged on the side wall of the adapter shell; the old pipeline interface and the new pipeline interface are communicated with the cavity inside the adapter shell; a pouring plugging groove is arranged in the shell wall of the adapter shell near the old pipeline interface which needs to be plugged, and a plug-in plugging groove is arranged at the two ends of the pouring plugging groove; and the plugging piece is inserted into the plug-in plugging groove to plug the old pipeline interface which needs to be plugged. In the application, the new pipeline interface and the old pipeline interface are arranged on the adapter shell, so that the new pipeline and the old pipeline can be conveniently connected. Through the nesting structure, the new and old pipelines can be quickly connected, the pipelines do not need to be massively removed and reconstructed, the construction difficulty and cost are reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of underground pipeline construction technology, and more specifically, to a nested structure for switching between old and new pipelines. Background Technology

[0002] With the advancement and development of urbanization, towns built in the past are facing the problem of gradual aging, especially in the increasingly aging urban water supply and drainage pipeline systems. As a result, urban renewal projects are increasing, including various types such as rainwater and sewage separation, misconnection, connection of new and old pipelines, adjustment and renewal of local pipeline positions, etc.

[0003] This involves construction work around existing pipeline networks in built-up areas, where new pipelines must be laid while ensuring that the old pipeline system continues to operate.

[0004] Sometimes, it is necessary to complete the construction of a new pipeline before the old pipeline can be decommissioned and the new pipeline network can be used for water supply. Therefore, it is necessary to complete the replacement of the urban water supply and drainage system while ensuring the functionality of the old pipeline network system.

[0005] The existing construction methods for pipeline replacement and iteration mostly involve building a new section of pipeline and then temporarily connecting the original water supply and drainage system pipeline to the manhole of the new pipeline system. This often results in the need to build a new pipeline in the middle of the old and new pipeline systems. If the construction involves roads in built-up areas, lanes need to be closed to rush the work under traffic pressure, which often requires a large investment of resources.

[0006] Furthermore, there is also the method of connecting new and old pipelines by constructing a "riding manhole," which involves adding a special inspection well to the pipeline. During the construction of this type of well, only an opening needs to be made at the top of the main pipe before adding the well, without the need for flow interruption measures. This method is suitable for pipe jacking construction on newly built main pipes or for connecting new branch pipes to old main pipes. However, this method is mostly only suitable for updating and improving branch pipes in a pipeline network system and merging them into the old main pipe. According to the pipeline drainage elevation, when updating the main pipeline, because the main pipe is buried deeper than the branch pipe, the riding manhole method is not suitable for this type of pipeline network construction process of updating the main pipe. Utility Model Content

[0007] The purpose of this application is to provide a nested structure for switching between old and new pipelines, which can reduce construction difficulty and cost, and improve construction efficiency.

[0008] To achieve the above objectives, this application provides a nested structure for switching between old and new pipelines, including:

[0009] The adapter shell has an internal cavity, and at least one new pipe interface and at least one old pipe interface are provided on the side wall of the adapter shell. The old pipe interface and the new pipe interface are connected to the internal cavity of the adapter shell. A casting sealing groove and a sealing groove are provided at both ends of the casting sealing groove in the shell wall near the old pipe interface that needs to be sealed.

[0010] A sealing component is inserted into the sealing groove to seal the old pipe interface that needs to be sealed.

[0011] In an optional embodiment, the adapter shell includes a first sub-shell and a second sub-shell, the first sub-shell and the second sub-shell being distributed sequentially from top to bottom along the direction of gravity and communicating with each other, the casting sealing groove and the insertion sealing groove penetrating the shell wall of the first sub-shell and the shell wall of the second sub-shell axially;

[0012] At least one of the new pipe interfaces is provided on the second sub-shell;

[0013] A portion of the inner wall of the old pipe interface is formed on the first sub-shell, and another portion of the inner wall of the old pipe interface is formed on the second sub-shell.

[0014] In an optional embodiment, the first sub-shell and the second sub-shell are sleeve structures;

[0015] The first sub-shell has openings at both ends, the second sub-shell has an opening at one end closer to the first sub-shell, and the second sub-shell is sealed at the other end away from the first sub-shell.

[0016] In an optional embodiment, the first sub-shell and the second sub-shell are cylindrical sleeve structures or polygonal prism sleeve structures.

[0017] In an optional embodiment, the casting sealing groove and the insertion sealing groove are connected.

[0018] In an optional embodiment, a sealing gasket is provided on the inner wall of the old pipe interface.

[0019] In an optional embodiment, the sealing gasket includes at least two nested sub-sealing gaskets.

[0020] In an optional embodiment, the sidewall of the at least two nested sub-sealing gaskets formed by the sealing gasket has an arcuate wall surface away from the adapter shell.

[0021] In an optional implementation, the height h1 of the old pipe interface is greater than the height h2 of the new pipe interface in the direction of gravity.

[0022] In an optional embodiment, on a plane perpendicular to the axis of the adapter shell, the extending direction L1 of the casting sealing groove and the insertion sealing groove matches the extending direction L2 of the shell wall of the adapter shell.

[0023] In this application, the adapter shell is equipped with new pipe interfaces and old pipe interfaces, which can easily connect new and old pipes. Through this nested structure, rapid docking between new and old pipes can be achieved without large-scale dismantling and reconstruction of the pipes, reducing construction difficulty and cost, and improving construction efficiency.

[0024] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the structure from one perspective of one embodiment of the nested structure provided in this application;

[0027] Figure 2 for Figure 1 Sectional view along the middle AA direction;

[0028] Figure 3 A two-view structural diagram of one embodiment of the nested structure provided in this application;

[0029] Figure 4 A schematic diagram of the structure from one perspective of another embodiment of the nested structure provided in this application;

[0030] Figure 5 A two-view structural diagram of another embodiment of the nested structure provided in this application.

[0031] icon:

[0032] 100 - Adapter housing; 110 - First sub-housing; 120 - Second sub-housing; 130 - New pipe interface; 140 - Old pipe interface; 150 - Casting and sealing groove; 160 - Insertion and sealing groove; 170 - Inspection port;

[0033] 200 - Sealing component;

[0034] 300 - Sealing gasket; 310 - Sub-sealing gasket; 320 - Curved wall surface. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] Embodiments of this application provide nested structures for switching between old and new pipelines, such as... Figures 1 to 3 As shown, the nested structure includes an adapter shell 100 and a sealing element 200.

[0039] like Figure 1 and Figure 2 As shown, the adapter shell 100 has an internal cavity, and at least one new pipe interface 130 and at least one old pipe interface 140 are provided on the side wall of the adapter shell 100; the old pipe interface 140 and the new pipe interface 130 are connected to the internal cavity of the adapter shell 100.

[0040] For example, the new pipe interface 130 is used to connect a new pipe, and the old pipe interface 140 is used to connect an old pipe. The new and old pipes are connected through the adapter shell 100. During use, sewage in the old pipe enters the cavity of the adapter shell 100 through the old pipe interface 140, and then is discharged into the new pipe through the new pipe interface 130.

[0041] For example, one new pipe interface 130 and one old pipe interface 140 are provided; in another embodiment, one new pipe interface 130 and two old pipe interfaces 140 are provided. In yet another embodiment, two new pipe interfaces 130 and two old pipe interfaces 140 are provided. Of course, other numbers of new pipe interfaces 130 and old pipe interfaces 140 can also be provided. The technical solution of this application will be described below based on the premise that two new pipe interfaces 130 and two old pipe interfaces 140 are provided.

[0042] A casting sealing groove 150 and a sealing groove 160 are provided at both ends of the casting sealing groove 150 in the shell wall near the old pipe interface 140 that needs to be sealed.

[0043] A sealing element 200 is inserted into the sealing groove 160 to seal the old pipe interface 140 that needs to be sealed.

[0044] For example, the casting sealing groove 150 is used to cast sealing material, such as cement, asphalt, molten rubber or other materials, to seal the casting sealing groove 150.

[0045] For example, one end of the casting sealing groove 150 is provided with a sealing groove 160, and the other end of the casting sealing groove 150 is provided with another sealing groove 160.

[0046] For example, during use, after the new and old pipes are connected to the adapter shell 100, as follows: Figure 4 As shown, a sealing element 200 is inserted into one of the insertion slots 160, and another sealing element 200 is inserted into the other insertion slot 160 to seal the other end of the casting sealing groove 150, cutting off the connection between the old pipe interface 140 to be sealed and the adapter shell 100, thereby allowing sewage to flow from the adapter shell 100 to the new pipe. Sealing material is injected into the casting sealing groove 150 to further seal the old pipe interface 140 to be sealed.

[0047] In this application, the adapter shell 100 is provided with a new pipe interface 130 and an old pipe interface 140, which can easily connect the new pipe and the old pipe. This nested structure enables rapid connection between the new and old pipes without the need for large-scale demolition and reconstruction, reducing construction difficulty and cost, and improving construction efficiency. For example, in urban old pipeline renovation projects, there is no need to excavate large areas of road surface to repave the pipes; the switch between the new and old pipes can be completed simply by using this nested structure.

[0048] In this application, a double sealing mechanism is formed by setting a casting sealing groove 150 and an insertion sealing groove 160 in the shell wall of the adapter shell 100 near the old pipe interface 140 that needs to be sealed, and inserting a sealing component 200 for sealing, and then injecting sealing material into the casting sealing groove 150. The sealing component 200 is first inserted into the insertion sealing groove 160 to initially cut off the connection between the old pipe interface 140 that needs to be sealed and the adapter shell 100, so that sewage flows to the new pipe, and also provides a leak-proof sealed space for the casting material; then the sealing material is injected for further sealing to ensure the tightness and reliability of the sealing.

[0049] In this application, after the connection between the old and new pipes is completed and the old pipe interface 140 is sealed, the structure can ensure that after the sewage enters the cavity of the adapter shell 100 from the old pipe interface 140, it can only be discharged into the new pipe through the new pipe interface 130, thus preventing the sewage from flowing freely in the adapter shell 100 or leaking from the old pipe interface 140 that needs to be sealed, and ensuring the normal operation of the sewage discharge system.

[0050] If the adapter shell 100 is a one-piece molded shell, it is suitable for construction scenarios where new pipes and broken old pipes are connected. To enable the nested structure to be applied to construction scenarios involving both new and unbroken old pipes, thus improving the adaptability of the nested structure, such as... Figure 2 and Figure 3 As shown, in one embodiment, the adapter housing 100 includes a first sub-housing 110 and a second sub-housing 120.

[0051] For example, such as Figure 5 As shown, the first sub-shell 110 and the second sub-shell 120 are separately arranged but can be connected.

[0052] like Figure 2 and Figure 3 As shown, the first sub-shell 110 and the second sub-shell 120 are distributed sequentially from top to bottom along the direction of gravity and are interconnected; the casting sealing groove 150 and the insertion sealing groove 160 penetrate the shell walls of the first sub-shell 110 and the second sub-shell 120 axially. Exemplarily, the sealing member 200 penetrates the shell walls of the first sub-shell 110 and the second sub-shell 120 through the insertion sealing groove 160.

[0053] At least one new pipe interface 130 is provided on the second sub-housing 120. Exemplarily, one new pipe interface 130 is provided. In another embodiment, such as... Figure 4 As shown, two new pipe interfaces 130 are provided, and the two new pipe interfaces 130 are coaxially arranged. In another embodiment, two new pipe interfaces 130 are provided, and the axes of the two new pipe interfaces 130 are at an angle, such as 45°, 60°, 90° or 120°.

[0054] like Figure 3 or Figure 5 As shown, a portion of the inner wall of the old pipe interface 140 is formed on the first sub-shell 110, and another portion of the inner wall of the old pipe interface 140 is formed on the second sub-shell 120.

[0055] For example, during use, the second sub-shell 120 is placed below the old pipe, and then the first sub-shell 110 is installed on the second sub-shell 120, so that the old pipe interface 140 is snapped into the old pipe; the new pipe is connected to the new pipe interface 130, and then the pipe body located in the adapter shell 100 on the old pipe is broken to make the old pipe connected to the adapter shell 100. Then the old pipe interface 140 that needs to be sealed is sealed, and the sewage in the old pipe flows into the new pipe through the adapter shell 100.

[0056] For example, the first sub-shell 110 and the second sub-shell 120 are made of reinforced concrete or metal and have a large self-weight. Therefore, under normal circumstances, the first sub-shell 110 and the second sub-shell 120 can be directly connected. In special cases, fixing measures such as bolts can be added.

[0057] In this application, the adapter shell 100 is composed of a first sub-shell 110 and a second sub-shell 120. Compared with a one-piece molded shell, it can be better applied to construction scenarios involving new pipes and unbroken old pipes. The one-piece molded shell is only suitable for connecting new pipes and broken old pipes, while the split adapter shell 100 breaks this limitation, greatly improving the adaptability of the nested structure to different old pipe conditions, enabling the structure to be applied in more practical engineering projects.

[0058] In this application, during use, the second sub-shell 120 is first placed below the old pipe, and then the first sub-shell 110 is installed onto the second sub-shell 120, so that the old pipe interface 140 is snapped into the old pipe. This split-type installation method is relatively simple to operate, reduces construction difficulty, and improves construction efficiency. Especially in some scenarios with limited space or complex construction conditions, the flexibility of split-type installation can better demonstrate its advantages.

[0059] In this application, the pipe body located in the transition shell 100 on the old pipe is broken to connect the old pipe to the transition shell 100. This operation is easier to implement with the split-type transition shell 100 structure. The split structure provides more convenient operating space for old pipe processing, and construction personnel can more easily carry out the breaking operation to ensure the connection effect between the old pipe and the transition shell 100.

[0060] In this application, the casting sealing groove 150 and the insertion sealing groove 160 penetrate axially through the shell walls of the first sub-shell 110 and the second sub-shell 120. The sealing member 200 penetrates through the two sub-shells via the insertion sealing groove 160. This arrangement facilitates the sealing operation of the old pipe interface 140 that needs to be sealed. After the connection between the new and old pipes is completed, by inserting the sealing member 200 and injecting sealing material, the old pipe interface 140 can be effectively sealed, preventing sewage from leaking from the old pipe interface 140 and ensuring the tightness and reliability of the seal.

[0061] like Figure 5 As shown, in one embodiment, the first sub-shell 110 and the second sub-shell 120 are sleeve structures.

[0062] The first sub-shell 110 has openings at both ends, the second sub-shell 120 has an opening at one end near the first sub-shell 110, and the second sub-shell 120 is blocked at the other end away from the first sub-shell 110.

[0063] For example, the opening at one end of the first sub-housing 110 near the second sub-housing 120 is used to connect the second sub-housing 120, and the opening at one end of the first sub-housing 110 away from the second sub-housing 120 can serve as the inspection port 170 of the inspection well.

[0064] The first sub-shell 110 and the second sub-shell 120 are sleeve structures, and the first sub-shell 110 has an opening at one end near the second sub-shell 120 for connecting the second sub-shell 120. This sleeve connection method is relatively simple and direct, making it easy for on-site construction personnel to quickly and accurately assemble and connect the two sub-shells.

[0065] like Figure 4 and Figure 5 As shown, in one embodiment, the first sub-shell 110 and the second sub-shell 120 are cylindrical sleeve structures.

[0066] However, in another embodiment, the first sub-shell 110 and the second sub-shell 120 are polygonal prism-shaped sleeve structures. For example, the first sub-shell 110 and the second sub-shell 120 are triangular prism-shaped sleeve structures; in another embodiment, the first sub-shell 110 and the second sub-shell 120 are quadrangular prism-shaped sleeve structures; in another embodiment, the first sub-shell 110 and the second sub-shell 120 are pentagonal prism-shaped sleeve structures; in yet another embodiment, the first sub-shell 110 and the second sub-shell 120 are hexagonal prism-shaped sleeve structures; of course, the first sub-shell 110 and the second sub-shell 120 can also be other polygonal prism-shaped structures.

[0067] like Figure 1 As shown, in one embodiment, the casting sealing groove 150 and the insertion sealing groove 160 are connected.

[0068] like Figure 2 and Figure 3 As shown, in one embodiment, a sealing gasket 300 is provided on the inner wall of the old pipe interface 140 to ensure a sealed fit between the old pipe and the old pipe interface 140.

[0069] A sealing gasket 300 is installed on the inner wall of the old pipe interface 140. When the old pipe is inserted into the old pipe interface 140, the sealing gasket 300 can fill the tiny gap between the old pipe and the old pipe interface 140, forming a reliable sealing layer. This can effectively prevent sewage in the old pipe from leaking out of the interface and avoid sewage from polluting the surrounding environment.

[0070] like Figure 2 As shown, in one embodiment, the sealing gasket 300 includes at least two nested sub-sealing gaskets 310 to accommodate legacy pipes of different outer diameters at the legacy pipe interface 140.

[0071] For example, the smaller the outer diameter of the old pipe, the more nested the sub-sealing gasket 310.

[0072] For example, two sub-sealing gaskets 310 are provided, namely a first sub-gasket and a second sub-gasket, with the first sub-gasket fitted over the second sub-gasket. In another embodiment, three sub-sealing gaskets 310 are provided, namely a first sub-gasket, a second sub-gasket, and a third sub-gasket, with the first sub-gasket fitted over the second sub-gasket, and the second sub-gasket fitted over the third sub-gasket. Of course, other numbers of sub-sealing gaskets 310 can also be provided.

[0073] The sealing gasket 300 consists of at least two nested sub-sealing gaskets 310. This design allows the old pipe interface 140 to accommodate old pipes of different outer diameters. In actual engineering projects, the outer diameter of old pipes may vary due to factors such as specifications and service life. By adjusting the number of nested sub-sealing gaskets 310, when the outer diameter of the old pipe is small, increasing the number of nested sub-sealing gaskets 310 ensures that the sealing gasket 300 fits tightly against the outer wall of the old pipe, forming a good sealing effect; when the outer diameter of the old pipe is large, decreasing the number of nested sub-sealing gaskets 310 achieves the same seal. This greatly improves the adaptability to old pipes of different sizes and reduces sealing problems caused by mismatched old pipe sizes.

[0074] like Figure 2 or Figure 5 As shown, in one embodiment, the sidewall of the sealing gasket 300 formed by nesting at least two sub-sealing gaskets 310 has an arcuate wall surface 320 away from the adapter shell 100.

[0075] For example, the curved wall 320 can define an approximately spherical cavity structure.

[0076] In this application, the old pipe is typically cylindrical, and the sidewall of the sealing gasket 300 away from the adapter shell 100 has an arc-shaped wall surface 320. This arc-shaped design allows for a better fit to the outer wall shape of the old pipe. Compared to flat or other shaped sidewalls, the arc-shaped wall surface 320 increases the contact area with the old pipe, resulting in a tighter seal between the sealing gasket 300 and the old pipe. This effectively reduces the possibility of sewage leakage from the interface and ensures the normal operation of the sewage discharge system.

[0077] During actual installation, there may be some errors in the connection between the old pipe and the adapter shell 100, such as angular deviation or positional offset. The sealing gasket 300 of the curved wall surface 320 has a certain elastic deformation capacity, which can compensate for these installation errors through its own deformation, always maintaining a good fit with the outer wall of the old pipe, and ensuring that the sealing effect is not affected by the installation error.

[0078] In this application, the curved wall surface 320 serves to guide the insertion of the old pipe. During the process of clamping the old pipe to the old pipe interface 140, the curved shape of the curved wall surface 320 provides a smooth guide for the old pipe, making it easier and more accurate for the old pipe to abut against the sealing gasket 300. This reduces repeated adjustments caused by inaccurate alignment during installation and improves installation efficiency.

[0079] In this application, when the old pipe is in close contact with the sealing gasket 300 and is subjected to a certain pressure, the arc-shaped wall surface 320 can distribute the stress more evenly on the entire sealing gasket 300, avoiding stress concentration.

[0080] like Figure 2 As shown, in one embodiment, the height h1 of the old pipe interface 140 is greater than the height h2 of the new pipe interface 130 in the direction of gravity.

[0081] In this application, the height difference between the old pipe interface 140 and the new pipe interface 130 is set in accordance with the natural laws of sewage flow. Under the action of gravity, sewage will naturally flow from the relatively higher old pipe interface 140 to the lower new pipe interface 130, without the need for additional power equipment to drive the sewage flow.

[0082] In this application, the old pipe interface 140 is higher than the new pipe interface 130, which can effectively prevent sewage from flowing back at the connection between the old and new pipes.

[0083] like Figure 1 As shown, in one embodiment, on a plane perpendicular to the axis of the adapter shell 100, the extending direction L1 of the casting sealing groove 150 and the insertion sealing groove 160 matches the extending direction L2 of the shell wall of the adapter shell 100.

[0084] For example, the adapter shell 100 is cylindrical, and the outer wall of the adapter shell 100 is distributed along a circumferential trajectory. Then, the extension direction L2 of the shell wall of the adapter shell 100 is an arc-shaped trajectory, and the extension direction L1 of the casting sealing groove 150 and the insertion sealing groove 160 is also an arc-shaped trajectory.

[0085] In other embodiments, the adapter shell 100 is a quadrangular prism shell structure, and the outer wall of the adapter shell 100 extends in a straight line. Then, the extension direction L2 of the shell wall of the adapter shell 100 is a straight line trajectory, and the extension direction L1 of the casting sealing groove 150 and the insertion sealing groove 160 is also a straight line trajectory.

[0086] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0087] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A nested structure for switching between old and new pipelines, characterized in that, include: The adapter shell (100) has an internal cavity, and at least one new pipe interface (130) and at least one old pipe interface (140) are provided on the side wall of the adapter shell (100). The old pipe interface (140) and the new pipe interface (130) are connected to the internal cavity of the adapter shell (100). A casting sealing groove (150) and a sealing groove (160) are provided in the shell wall of the adapter shell (100) near the old pipe interface (140) that needs to be sealed. A sealing element (200) is inserted into the sealing groove (160) to seal the old pipe interface (140) that needs to be sealed.

2. The nested structure according to claim 1, characterized in that, The adapter shell (100) includes a first sub-shell (110) and a second sub-shell (120). The first sub-shell (110) and the second sub-shell (120) are distributed sequentially from top to bottom along the direction of gravity and are connected to each other. The casting sealing groove (150) and the insertion sealing groove (160) penetrate the shell wall of the first sub-shell (110) and the shell wall of the second sub-shell (120) along the axial direction. The second sub-housing (120) is provided with at least one of the new pipe interfaces (130). A portion of the inner wall of the old pipe interface (140) is formed on the first sub-shell (110), and another portion of the inner wall of the old pipe interface (140) is formed on the second sub-shell (120).

3. The nested structure according to claim 2, characterized in that, The first sub-shell (110) and the second sub-shell (120) are sleeve structures; The first sub-shell (110) has openings at both ends, the second sub-shell (120) has an opening at one end near the first sub-shell (110), and the second sub-shell (120) is blocked at one end away from the first sub-shell (110).

4. The nested structure according to claim 3, characterized in that, The first sub-shell (110) and the second sub-shell (120) are cylindrical sleeve structures or polygonal prism sleeve structures.

5. The nested structure according to claim 1, characterized in that, The casting sealing groove (150) and the insertion sealing groove (160) are connected.

6. The nested structure according to any one of claims 1 to 5, characterized in that, A sealing gasket (300) is provided on the inner wall of the old pipe interface (140).

7. The nested structure according to claim 6, characterized in that, The sealing gasket (300) includes at least two nested sub-sealing gaskets (310).

8. The nested structure according to claim 7, characterized in that, The sidewall of the sealing gasket (300) formed by the nesting of the at least two sub-sealing gaskets (310) away from the transition shell (100) has an arcuate wall surface (320).

9. The nested structure according to claim 1, characterized in that, In the direction of gravity, the height h1 of the old pipe interface (140) is greater than the height h2 of the new pipe interface (130).

10. The nested structure according to claim 1, characterized in that, On a plane perpendicular to the axis of the adapter shell (100), the extension direction L1 of the casting sealing groove (150) and the insertion sealing groove (160) matches the extension direction L2 of the shell wall of the adapter shell (100).

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