Nested structure for switching between new pipeline and old pipeline

Abstract

The invention relates to the technical field of underground pipeline construction, in particular to a nesting structure for switching between a new pipeline and an old pipeline. A cavity is formed in the adapter shell, at least one new pipe connector and at least one old pipe connector are formed in the side wall of the adapter shell and communicate with the cavity in the adapter shell, and a pouring plugging groove and insertion sealing grooves formed in the two ends of the pouring plugging groove are formed in the shell wall, close to the old pipe connector needing to be plugged, of the adapter shell. A plugging piece is inserted into the insertion sealing groove so as to plug an old pipe connector needing to be plugged. According to the connecting device, the new pipe connector and the old pipe connector are arranged on the adapter shell, so that a new pipeline and an old pipeline can be conveniently connected. Through the nested structure, rapid butt joint between the new pipeline and the old pipeline is achieved, large-scale disassembly and reconstruction of the pipelines are not needed, the construction difficulty and cost are reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of underground pipeline construction, and in particular to a nested structure for switching between new and old pipelines. Background Art

[0002] With the advancement and development of urbanization, previously built towns are facing the problem of gradual aging, especially the aging of urban water supply and drainage pipeline systems. Therefore, urban renewal projects are increasing, including various types of rainwater and sewage diversion, mixed connections, new and old pipeline joints, local pipeline line adjustments and updates, etc.

[0003] This involves construction around existing pipelines in built-up areas, where new buried pipelines must be laid while ensuring that the old pipeline system remains operational.

[0004] Sometimes it is necessary to complete the construction of a new section of pipeline before the old pipeline can be abolished and water can be passed through the new pipeline section. Therefore, the urban water supply and drainage system must be updated and replaced while ensuring the functionality of the old pipeline system.

[0005] Most existing pipeline renewal and replacement methods involve building a new section of pipeline and then temporarily connecting the original water supply and drainage system pipelines to the well of the new pipeline system. This often requires building a new pipeline between the old and new pipeline systems. If road construction is involved in built-up areas, lanes need to be closed due to traffic pressure, and construction often requires a large amount of resources.

[0006] Furthermore, there is also a method of connecting old and new pipelines by constructing a riding well, that is, a special inspection well built on the pipeline. During the construction of this well, it is only necessary to drill a hole on the top of the main pipe and then add a well without taking flow interruption measures. This is suitable for pipe jacking construction on a newly built main pipe, or connecting a new branch pipe to the old main pipe. However, this method is mostly only suitable for updating and perfecting the branch pipe of the pipeline system and incorporating it 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 well method is not suitable for the pipeline construction process of this type of main pipe update. Summary of the Invention

[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] In order to achieve the above object, the present invention provides a nested structure for switching between new and old pipelines, comprising: An adapter shell having a cavity therein, and at least one new pipe interface and at least one old pipe interface being provided on a side wall of the adapter shell, the old pipe interface and the new pipe interface being in communication with the cavity inside the adapter shell, and a cast sealing groove and plugging grooves provided at both ends of the cast sealing groove being provided in the shell wall of the adapter shell near the old pipe interface to be sealed; A plugging piece is inserted into the plugging groove to plug the old pipe interface that needs to be plugged.

[0009] In an optional embodiment, the adapter housing includes a first sub-housing and a second sub-housing, the first sub-housing and the second sub-housing being sequentially distributed from top to bottom along the direction of gravity and being connected to each other, and the casting sealing groove and the plugging sealing groove axially penetrate the housing wall of the first sub-housing and the housing wall of the second sub-housing; The second sub-housing is provided with at least one new pipe interface; Part of the inner wall of the old pipe interface is opened on the first sub-shell, and another part of the inner wall of the old pipe interface is opened on the second sub-shell.

[0010] In an optional embodiment, the first sub-housing and the second sub-housing are sleeve structures; Both ends of the first sub-shell are open, one end of the second sub-shell close to the first sub-shell is open, and one end of the second sub-shell away from the first sub-shell is blocked.

[0011] In an optional embodiment, the first sub-shell and the second sub-shell are cylindrical sleeve structures or polygonal prism sleeve structures.

[0012] In an optional embodiment, the casting sealing groove and the plugging groove are connected.

[0013] In an optional embodiment, a sealing gasket is provided on the inner wall of the old pipe interface.

[0014] In an optional embodiment, the sealing gasket includes at least two nested sub-sealing gaskets.

[0015] In an optional embodiment, the side wall of the sealing gasket formed by the nesting of the at least two sub-sealing gaskets, which is away from the adapter shell, has an arc-shaped wall surface.

[0016] In an optional embodiment, in the direction of gravity, the height h1 of the old pipe interface is greater than the height h2 of the new pipe interface.

[0017] In an optional embodiment, on a plane perpendicular to the axial direction of the adapter shell, an extension direction L1 of the casting sealing groove and the plugging sealing groove matches an extension direction L2 of the shell wall of the adapter shell.

[0018] In this application, the adapter shell is provided with a new pipe interface and an old pipe interface, which can easily connect the new pipeline to the old pipeline. Through this nested structure, the new and old pipelines can be quickly connected without large-scale dismantling and reconstruction of the pipelines, reducing the construction difficulty and cost and improving construction efficiency.

[0019] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A structural diagram from one perspective of one embodiment of the nested structure provided by this application; Figure 2 for Figure 1 Cross-sectional view along the AA axis; Figure 3 A schematic structural diagram of two perspectives of one embodiment of the nested structure provided in this application; Figure 4 A structural diagram from one perspective of another embodiment of the nested structure provided by the present application; Figure 5 This is a structural schematic diagram from two perspectives of another embodiment of the nested structure provided in this application.

[0022] icon: 100 - adapter shell; 110 - first sub-shell; 120 - second sub-shell; 130 - new pipe interface; 140 - old pipe interface; 150 - casting and plugging groove; 160 - plugging groove; 170 - inspection port; 200-blocking piece; 300 - sealing gasket; 310 - sub-sealing gasket; 320 - curved wall. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] In the description of this application, it should be noted that the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0025] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0026] The embodiment of the present application provides a nested structure for switching between old and new pipelines, such as Figures 1 to 3 As shown, the nested structure includes an adaptor shell 100 and a blocking member 200 .

[0027] like Figure 1 and Figure 2 As shown, the adapter shell 100 has a cavity inside, and at least one new pipe interface 130 and at least one old pipe interface 140 are opened 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.

[0028] Exemplarily, the new pipe interface 130 is used to connect the new pipe, and the old pipe interface 140 is used to connect the old pipe, and the new and old pipes are connected through the adapter shell 100; during use, the sewage in the old pipe enters the cavity of the adapter shell 100 from the old pipe interface 140, and then is discharged into the new pipe through the new pipe interface 130.

[0029] In an exemplary embodiment, one new pipe interface 130 is provided and one old pipe interface 140 is provided. In another embodiment, one new pipe interface 130 is provided and two old pipe interfaces 140 are provided. In another embodiment, two new pipe interfaces 130 are provided 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 following description of the technical solution of this application is based on the provision of two new pipe interfaces 130 and two old pipe interfaces 140.

[0030] A casting sealing groove 150 and plugging grooves 160 are provided at both ends of the casting sealing groove 150 in the shell wall of the adapter shell 100 near the old pipe interface 140 that needs to be sealed.

[0031] A sealing member 200 is inserted into the sealing groove 160 to seal the old pipe interface 140 that needs to be sealed.

[0032] Illustratively, the casting plugging groove 150 is used for casting a plugging material, such as cement, asphalt, molten rubber or other materials, to seal the casting plugging groove 150 .

[0033] Illustratively, one end of the casting and plugging groove 150 is provided with an inserting sealing groove 160 , and the other end of the casting and plugging groove 150 is provided with another inserting sealing groove 160 .

[0034] For example, during use, after the new tube and the old tube are connected to the adapter shell 100, Figure 4 As shown, one plugging member 200 is inserted into one of the plugging slots 160, and the other plugging member 200 is inserted into the other plugging slot 160 to seal the other end of the cast plugging slot 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. A plugging material is injected into the cast plugging slot 150 to further seal the old pipe interface 140 to be sealed.

[0035] In this application, the adapter housing 100 is provided with a new pipe interface 130 and an old pipe interface 140, which facilitates the connection of the new and old pipes. This nested structure enables rapid docking between the new and old pipes, eliminating the need for large-scale dismantling and reconstruction of the pipes, reducing construction difficulty and costs, and improving construction efficiency. For example, in urban old pipe reconstruction projects, there is no need to excavate large areas of road surface to re-lay the pipes; the nested structure can simply be used to complete the switching between the new and old pipes.

[0036] In this application, a double sealing mechanism is formed by providing a cast sealing groove 150 and an insert sealing groove 160 in the shell wall of the adapter shell 100 near the old pipe interface 140 that needs to be sealed, inserting a sealing piece 200 for sealing, and then injecting a sealing material into the cast sealing groove 150. The sealing piece 200 is first inserted into the insert sealing groove 160, initially cutting off the connection between the old pipe interface 140 that needs to be sealed and the adapter shell 100, allowing sewage to flow to the new pipe and also providing a leak-proof enclosed space for the casting material; then the sealing material is injected to further seal the blockage, ensuring the tightness and reliability of the seal.

[0037] In the present application, after the connection between the new and old 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, thereby preventing the sewage from flowing freely in the adapter shell 100 or leaking from the old pipe interface 140 that needs to be sealed, thereby ensuring the normal operation of the sewage discharge system.

[0038] If the adapter shell 100 is an integrally formed shell, it is suitable for the construction scene where a new pipe and an old pipe that has been broken are connected. In order to make the nested structure applicable to the construction scene where a new pipe and an old pipe that has not been broken are connected, the adaptability of the nested structure can be improved. 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 .

[0039] For example, Figure 5 As shown, the first sub-housing 110 and the second sub-housing 120 are provided separately and can be connected to each other.

[0040] like Figure 2 and Figure 3 As shown, the first sub-housing 110 and the second sub-housing 120 are arranged sequentially from top to bottom along the direction of gravity and are interconnected; the casting sealing groove 150 and the plugging sealing groove 160 axially penetrate the housing wall of the first sub-housing 110 and the housing wall of the second sub-housing 120. For example, the sealing member 200 penetrates the housing wall of the first sub-housing 110 and the housing wall of the second sub-housing 120 through the plugging sealing groove 160.

[0041] At least one new pipe interface 130 is provided on the second sub-housing 120. For example, one new pipe interface 130 is provided. 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°.

[0042] like Figure 3 or Figure 5 As shown, a portion of the inner wall of the old pipe interface 140 is opened on the first sub-housing 110 , and another portion of the inner wall of the old pipe interface 140 is opened on the second sub-housing 120 .

[0043] For example, during use, the second sub-shell 120 is placed under 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 tube body of the old pipe located in the adapter shell 100 is broken to connect the old pipe with the adapter shell 100, and 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.

[0044] Illustratively, the first sub-shell 110 and the second sub-shell 120 are made of reinforced concrete or metal and have a large deadweight. Therefore, in general, the first sub-shell 110 and the second sub-shell 120 can be directly docked. In special cases, fixing measures such as bolts can be added.

[0045] In this application, the adapter housing 100, comprised of a first sub-housing 110 and a second sub-housing 120, is better suited for both new and unbroken pipe installations compared to one-piece housings. While one-piece housings are only suitable for connecting new pipes to broken old pipes, the split adapter housing 100 overcomes this limitation, significantly improving the adaptability of the nested structure to varying pipe conditions and enabling its application in a wider range of practical projects.

[0046] In this application, when in use, the second sub-housing 120 is first placed under the old pipe, and then the first sub-housing 110 is installed on the second sub-housing 120, so that the old pipe interface 140 is snapped into the old pipe. This split installation method is relatively simple to operate, reduces construction difficulty, and improves construction efficiency. The flexibility of the split installation method is particularly advantageous in scenarios with limited space or complex construction conditions.

[0047] In this application, the pipe body of the old pipe located in the adapter shell 100 is broken to connect the old pipe to the adapter shell 100. This operation is easier to implement with the split adapter shell 100 structure. The split structure provides a more convenient operating space for the old pipe treatment, allowing construction workers to more easily perform the breaking operation and ensure the connection between the old pipe and the adapter shell 100.

[0048] In this application, cast sealing grooves 150 and plugging grooves 160 axially penetrate the shell walls of the first sub-shell 110 and the second sub-shell 120, and plugging member 200 extends through both sub-shells via plugging grooves 160. This arrangement facilitates the sealing of the old pipe interface 140 that needs to be sealed. After the new and old pipes are connected, the old pipe interface 140 can be effectively sealed by inserting the plugging member 200 and injecting the plugging material, preventing sewage leakage from the old pipe interface 140 and ensuring the tightness and reliability of the plugging.

[0049] like Figure 5 As shown, in one embodiment, the first sub-housing 110 and the second sub-housing 120 are sleeve structures.

[0050] Both ends of the first sub-housing 110 are open, one end of the second sub-housing 120 close to the first sub-housing 110 is open, and one end of the second sub-housing 120 away from the first sub-housing 110 is blocked.

[0051] For example, the opening at one end of the first sub-housing 110 close to the second sub-housing 120 is used for connecting to 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.

[0052] The first sub-shell 110 and the second sub-shell 120 are of a sleeve structure, and the opening at one end of the first sub-shell 110 close to the second sub-shell 120 is used to connect to the second sub-shell 120. This sleeve connection method is relatively simple and direct, making it easy for on-site construction workers to quickly and accurately assemble and connect the two sub-shells.

[0053] like Figure 4 and Figure 5 As shown, in one embodiment, the first sub-housing 110 and the second sub-housing 120 are cylindrical sleeve structures.

[0054] However, in another embodiment, the first sub-housing 110 and the second sub-housing 120 are of a polyhedral prism-type sleeve structure. For example, the first sub-housing 110 and the second sub-housing 120 are of a triangular prism-type sleeve structure; in another embodiment, the first sub-housing 110 and the second sub-housing 120 are of a quadrangular prism-type sleeve structure; in another embodiment, the first sub-housing 110 and the second sub-housing 120 are of a pentagonal prism-type sleeve structure; in another embodiment, the first sub-housing 110 and the second sub-housing 120 are of a hexagonal prism-type sleeve structure; of course, the first sub-housing 110 and the second sub-housing 120 may also be of other polyhedral prism-type structures.

[0055] like Figure 1 As shown, in one embodiment, the pouring sealing groove 150 and the plugging sealing groove 160 are in communication.

[0056] 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 sealing fit between the old pipe and the old pipe interface 140 .

[0057] A sealing gasket 300 is provided on the inner wall of the old pipe interface 140. When the old pipe is clamped into the old pipe interface 140, the sealing gasket 300 can fill the small 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 preventing sewage from polluting the surrounding environment.

[0058] like Figure 2 As shown, in one embodiment, the gasket 300 includes at least two nested sub-gaskets 310 to enable the old pipe interface 140 to adapt to old pipes with different outer diameters.

[0059] For example, the smaller the outer diameter of the old pipe is, the more nesting number of the sub-gaskets 310 is required.

[0060] Exemplarily, two sub-gaskets 310 are provided, namely a first sub-gasket and a second sub-gasket, with the first sub-gasket being sleeved over the second sub-gasket. In another embodiment, three sub-gaskets 310 are provided, namely a first sub-gasket, a second sub-gasket, and a third sub-gasket, with the first sub-gasket being sleeved over the second sub-gasket, and the second sub-gasket being sleeved over the third sub-gasket. Of course, other numbers of sub-gaskets 310 may also be provided.

[0061] The sealing gasket 300 is composed of at least two nested sub-sealing gaskets 310. This design enables the old pipe interface 140 to adapt to old pipes of different outer diameters. In actual projects, the outer diameter of the old pipe may vary due to factors such as specifications and years of use. 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 can ensure that the sealing gasket 300 fits tightly against the outer wall of the old pipe to form a good sealing effect; when the outer diameter of the old pipe is large, reducing the number of nested sub-sealing gaskets 310 can also achieve sealing. This greatly improves the adaptability to old pipes of different sizes and reduces sealing problems caused by mismatched old pipe sizes.

[0062] like Figure 2 or Figure 5 As shown, in one embodiment, the side wall of the sealing gasket 300 formed by nesting at least two sub-sealing gaskets 310 away from the adapter housing 100 has an arc-shaped wall surface 320 .

[0063] Exemplarily, the arc-shaped wall surface 320 can define a cavity structure that is approximately spherical.

[0064] In this application, the old pipe is typically cylindrical. The sidewall of the gasket 300, facing away from the adapter housing 100, features a curved surface 320. This curved design better conforms to the outer shape of the old pipe. Compared to flat or other shaped sidewalls, the curved surface 320 increases the contact area with the old pipe, creating a tighter seal between the gasket 300 and the old pipe, effectively reducing the possibility of sewage leakage from the interface and ensuring the normal operation of the sewage drainage system.

[0065] During the actual installation process, the connection between the old pipe and the adapter housing 100 may have certain errors, such as angle deviation and position offset. The sealing gasket 300 of the curved wall 320 has a certain elastic deformation capacity and can compensate for these installation errors through its own deformation, always maintaining a good fit with the outer wall of the old pipe, ensuring that the sealing effect is not affected by installation errors.

[0066] In the present application, the curved wall 320 can serve as a guide for inserting the old pipe. During the process of clamping the old pipe into the old pipe interface 140, the curved shape of the curved wall 320 can provide a smooth guide for the old pipe, making it easier for the old pipe to accurately abut against the sealing gasket 300. This reduces repeated adjustments caused by inaccurate alignment during installation and improves installation efficiency.

[0067] In the present 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 disperse the stress more evenly over the entire sealing gasket 300 to avoid stress concentration.

[0068] like Figure 2 As shown, in one embodiment, 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 .

[0069] 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 law 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.

[0070] In the present 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.

[0071] like Figure 1 As shown, in one embodiment, on a plane perpendicular to the axial direction 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 .

[0072] Exemplarily, the adapter shell 100 is cylindrical, and the outer wall of the adapter shell 100 is distributed along a circular trajectory. Then, the extension direction L2 of the shell wall of the adapter shell 100 is a circular arc trajectory, and the extension direction L1 of the casting sealing groove 150 and the plugging groove 160 is also a circular arc trajectory.

[0073] In other embodiments, the adapter shell 100 is a quadrangular prism shell structure, and the outer wall of the adapter shell 100 extends along 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 plugging groove 160 is also a straight line trajectory.

[0074] It should be noted that, unless there is any conflict, the features in the embodiments of this application can be combined with each other.

[0075] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A nested structure for switching between old and new pipelines, characterized in that: include: An adapter shell (100), wherein the adapter shell (100) has a cavity inside, and at least one new pipe interface (130) and at least one old pipe interface (140) are provided on a side wall of the adapter shell (100), wherein the old pipe interface (140) and the new pipe interface (130) are in communication with the cavity inside the adapter shell (100), and a casting sealing groove (150) and plugging sealing grooves (160) are provided in the shell wall of the adapter shell (100) near the old pipe interface (140) to be sealed. A blocking piece (200) is inserted into the blocking groove (160) to block the old pipe interface (140) that needs to be blocked.

2. The nested structure according to claim 1, characterized in that: The adapter shell (100) comprises a first sub-shell (110) and a second sub-shell (120), wherein the first sub-shell (110) and the second sub-shell (120) are sequentially distributed from top to bottom along the direction of gravity and are connected to each other, and the casting sealing groove (150) and the plugging sealing groove (160) axially penetrate the shell wall of the first sub-shell (110) and the shell wall of the second sub-shell (120); At least one new pipe interface (130) is provided on the second sub-housing (120); Part of the inner wall of the old pipe interface (140) is opened on the first sub-shell (110), and another part of the inner wall of the old pipe interface (140) is opened on the second sub-shell (120).

3. The nested structure according to claim 2, characterized in that: The first sub-housing (110) and the second sub-housing (120) are sleeve structures; Both ends of the first sub-shell (110) are open, one end of the second sub-shell (120) close to the first sub-shell (110) is open, and one end of the second sub-shell (120) away from the first sub-shell (110) is blocked.

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 pouring sealing groove (150) and the plugging sealing groove (160) are in communication.

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) comprises at least two nested sub-sealing gaskets (310).

8. The nested structure according to claim 7, characterized in that: The side wall of the sealing gasket (300) formed by the nesting of the at least two sub-sealing gaskets (310) and away from the adapter housing (100) has an arc-shaped 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 axial direction of the adapter shell (100), the extension direction L1 of the casting sealing groove (150) and the plugging sealing groove (160) matches the extension direction L2 of the shell wall of the adapter shell (100).

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