Combined pipe fitting for butt joint of self-anchoring pipelines

Abstract

The invention relates to the technical field of pipeline connection, in particular to a self-anchoring pipeline butt joint combined pipe fitting which comprises a first pipe fitting and a second pipe fitting, the first pipe fitting is provided with a first inserting opening, and the first inserting opening is provided with a first long sliding section and a second long sliding section; a first stop ring located between the first sliding long section and the second sliding long section is arranged on the outer wall of the first inserting opening. The second pipe fitting is provided with a first bellmouth connected with the first inserting opening in an inserted mode, a first self-anchoring bin, a first sliding bin, a partition part, a first sealing bin and a second sliding bin are sequentially arranged in the first bellmouth, and the partition part is used for the first sliding long section to enter the second sliding bin; a first self-anchoring piece is arranged in the self-anchoring bin and used for anchoring the first inserting opening and stopping the second sliding long section from moving into the second sliding bin. A first sealing piece connected with the second sliding long section in a sealed mode is arranged in the first sealing bin. According to the method, multi-section simultaneous construction of the whole-line self-anchoring connector can be achieved, and when foundation settlement is too large, the axial tension of the connector is reduced, and connector pulling-out or cracking is avoided.

Description

Technical Field

[0001] This invention relates to the field of pipe connection technology, and in particular to a self-anchoring pipe connection assembly. Background Technology

[0002] Each cast iron pipe has a socket and a spigot. The spigot of one of two adjacent cast iron pipes is inserted into the socket of the other cast iron pipe to achieve connection, so that the ends of each cast iron pipe are connected to form a self-anchored pipeline.

[0003] Currently, to facilitate and expedite pipeline construction, a series of self-anchoring interfaces have emerged on the market. For example, an existing patent (publication number: CN111664303A) discloses a cast iron pipe self-anchoring interface, which includes "a cast iron pipe socket and a cast iron pipe spigot, with a steel ball annular groove and a sealing ring embedded in the cast iron pipe socket, and a stop ring on the outer wall of the cast iron pipe spigot, the stop ring being located in the steel ball annular groove, with a steel ball inside the steel ball annular groove; the cast iron pipe spigot is inserted into the cast iron pipe socket, and the sealing ring is squeezed between the cast iron pipe socket and the cast iron pipe spigot," etc. This technical solution has the technical effect of "self-locking of two steel pipes, effectively preventing them from falling off."

[0004] However, using the above-mentioned self-anchoring interface has the following drawbacks: 1. During pipeline construction, uneven ground settlement is often encountered. When the ground settlement is too large, the axial tension of the self-anchored joint will be too large, which will lead to the joint being pulled out or cracked.

[0005] 2. It is difficult to carry out simultaneous construction of multiple sections of self-anchored interfaces along the entire line. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a combined pipe fitting for self-anchored pipeline connection, which aims to solve the technical problems of the prior art being unable to achieve simultaneous construction of multiple sections of self-anchored interfaces along the entire line, and the excessive axial tensile force of the interface caused by excessive foundation settlement, which leads to the interface being pulled out or cracked.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A self-anchoring pipe connection assembly includes: The first pipe fitting has a first socket, the first socket has a first sliding section and a second sliding section, and a first stop ring located between the first sliding section and the second sliding section is fixed on the outer wall of the first socket. The second pipe fitting has a first socket that is inserted into a first spigot. The first socket contains a first self-anchoring chamber, a first sliding chamber, a second sliding chamber, and a first sealing chamber. A partition is provided between the first and second sliding chambers to block the first stop ring, preventing the first sliding segment from entering the second sliding chamber. The first sliding chamber is located between the first self-anchoring chamber and the partition, and the first sealing chamber is located between the partition and the second sliding chamber. A first self-anchoring element is provided within the self-anchoring chamber to anchor the first spigot and also to block the first stop ring, preventing the second sliding segment from moving out of the first socket. A first sealing element is provided within the first sealing chamber to seal the second sliding segment.

[0008] Furthermore, the first pipe fitting has a second socket for connecting to the socket of the first pipe section at the junction of the two pipe sections. The second pipe fitting also has a second socket for inserting into the socket of the second pipe section at the junction of the two pipe sections. The second socket contains a second self-anchoring chamber and a second sealing chamber. The second sealing chamber contains a second sealing element for sealing connection with the socket of the first pipe section. The second self-anchoring chamber contains a second self-anchoring element for anchoring the socket of the first pipe section.

[0009] Furthermore, a second stop ring is fixedly fitted on the outer wall of the second socket, and an isolation part is provided between the second self-anchoring chamber and the second sealing chamber. The isolation part and the second self-anchoring member can form an annular groove for accommodating the second stop ring. The second self-anchoring member is also used to block the second stop ring to prevent the second socket from moving out of the second socket along the axial direction of the first pipe or the second pipe.

[0010] Furthermore, the second self-anchoring chamber is a conical chamber, with the smaller end of the second self-anchoring chamber near the port of the second socket and the larger end of the second self-anchoring chamber near the isolation portion. The second self-anchoring member and the second self-anchoring chamber are in a tapered sliding fit so that the annular groove can be formed between the second self-anchoring member and the isolation portion.

[0011] Furthermore, the second sealing chamber is located near the end face of the second socket, and the second self-anchoring chamber is located near the end face of the second insertion port.

[0012] Furthermore, the first self-anchoring chamber is a conical chamber, with the smaller end of the first self-anchoring chamber close to the port of the first socket, and the larger end of the first self-anchoring chamber close to and communicating with the first sliding chamber, and the first self-anchoring component and the first self-anchoring chamber slidingly engaging in a conical manner.

[0013] Furthermore, the first stop ring is welded to the outer wall of the first socket.

[0014] Furthermore, the second stop ring is welded to the outer wall of the second socket.

[0015] Furthermore, the length of the second sliding segment is greater than or equal to the length of the first sliding segment.

[0016] Furthermore, the taper of the conical chamber is 45° to 60°.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In a combined pipe fitting system, when the first pipe fitting is connected to the second pipe fitting, the spigot of the first pipe fitting is inserted into the socket of the second pipe fitting to form the interface connecting the first and second pipe fittings. After the connection is completed, the first sliding section is located in the first sliding chamber, the second sliding section is located in the second sliding chamber, the first stop ring abuts against the end wall, and the first sealing element is sealed on the outer wall of the first spigot. When the foundation settlement is excessive, that is, under the action of external force, the first pipe fitting is forced to move relative to the second pipe fitting, causing the first stop ring to move along the axial direction of the first pipe fitting towards the first self-anchoring element. When the first self-anchoring element moves to abut against the first self-anchoring element, it prevents the second sliding section from moving out of the first socket along the axial direction of the first pipe fitting. In this way, when the foundation settles, the interface connecting the first and second pipe fittings can elongate, avoiding the interface from bearing greater pull-out force, thereby effectively preventing the interface from being pulled out or cracked.

[0018] 2. When connecting two pipeline sections, place the installed combined pipe fitting into the joint of the two pipeline sections, connect any one end of the combined pipe fitting to one pipeline. After the connection is completed, since the first pipe fitting in the combined pipe fitting can extend and retract relative to the second pipe fitting, stretch the other end of the combined pipe fitting to connect with the other pipeline section to achieve pipeline docking. In this way, multiple sections of self-anchored joints can be constructed simultaneously.

[0019] 3. After the two pipeline sections are connected by a combination fitting, when the pipeline is stretched or sunk due to settlement or earthquake, the first fitting in the combination fitting can expand and contract relative to the second fitting. Therefore, it can effectively prevent the interface between the first and second fittings from bearing excessive pull-out force, which would cause the self-anchoring interface between the first and second fittings to fail. This increases the safety performance of the self-anchored pipeline and improves the stability of pipeline operation. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the combined pipe fitting of the present invention; Figure 2 This is a cross-sectional view of the first pipe fitting involved in this embodiment; Figure 3 This is a cross-sectional view of the second pipe fitting involved in this embodiment; Figure 4This is a structural diagram illustrating the connection of two pipeline sections using a combined pipe fitting in this embodiment. Figure 5 This is a schematic diagram of the structure after connecting two pipeline sections using the combined pipe fittings in this embodiment; Figure 6 This is a schematic diagram of the structure of the combined pipe fitting involving self-anchored pipeline connection during tensioning in this embodiment; Figure 7 for Figure 6 Enlarged structural diagram at point A; Figure 8 for Figure 6 A magnified structural diagram at point B in the middle.

[0021] Numbers in the attached drawings: 1. First fitting; 10. First spigot; 101. First sliding section; 102. Second sliding section; 103. First stop ring; 11. Second socket; 110. Second self-anchoring chamber; 111. Second sealing chamber; 112. Isolation part; 113. Second self-anchoring component; 114. Second sealing component; 115. Ring groove; 2. Second fitting; 20. First socket; 201. First self-anchoring chamber; 202. First sliding chamber; 203. Second sliding chamber; 204. First sealing chamber; 205. Partition part; 206. First self-anchoring component; 207. First sealing component; 21. Second spigot; 210. Second stop ring; 3. First section of pipeline spigot; 4. Second section of pipeline socket. Detailed Implementation

[0022] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] In the description of this invention, it should be understood that the terms "width," "upper," "lower," "front," "rear," "top," and "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and 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, and therefore should not be construed as a limitation of the invention. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" 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 mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In this invention, unless otherwise expressly specified and limited, the first feature "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0025] Please refer to Figures 1-8 The present invention provides a self-anchored pipeline connection combination fitting, including a first fitting 1 and a second fitting 2, both of which are ductile iron pipes.

[0026] Reference Figures 1-3 The first pipe fitting 1 has a spigot and a socket at its two ends, respectively. The spigot of the first pipe fitting 1 is designated as a first spigot 10. The first spigot 10 has a first sliding section 101 and a second sliding section 102. A first stop ring 103 is fixed on the outer wall of the first spigot 10, located between the first sliding section 101 and the second sliding section 102. The first stop ring 103 is welded to the outer wall of the first spigot 10, and the first stop ring 103 is coaxially arranged with the first spigot 10.

[0027] Reference Figure 1 , Figure 2 and Figures 4-8 The socket of the first pipe fitting 1 is a second socket 11, which is used to connect with the spigot of the first section of the pipeline (the spigot 3 of the first section of the pipeline) at the joint of the two sections of pipeline. The second socket 11 is provided with a second self-anchoring chamber 110 and a second sealing chamber 111. A second sealing element 114 is fixed in the second sealing chamber 111. The second sealing element 114 is a sealing ring and is used to seal the connection with the spigot of the first section of pipeline. The second self-anchoring chamber 110 is provided with a second self-anchoring element 113, which is used to anchor the spigot of the first section of pipeline.

[0028] Reference Figures 1-3 An isolation portion 112 is fixed between the second self-anchoring chamber 110 and the second sealing chamber 111. The isolation portion 112 has an annular structure and is coaxial with the second pipe fitting 2. The second sealing chamber 111 is close to the end face of the first socket 20, and the second self-anchoring chamber 110 is close to the end face of the second socket 11. In other words, along the axial direction of the pipeline, the second sealing chamber 111 is located at the rear end of the second self-anchoring chamber 110. When the inlet of the first section of pipeline is inserted into the second socket 11 of the first pipe fitting 1, and the second sealing member 114 is sealed to the second sealing member 114, it can effectively prevent liquid or gas in the first pipe fitting 1 from being transmitted to the second self-anchoring chamber 110, and prevent the liquid or gas in the first pipe fitting 1 from corroding the second self-anchoring member 113, thereby effectively improving the service life of the second self-anchoring member 113.

[0029] Reference Figures 1-3The second self-anchoring chamber 110 is a conical chamber, with its smaller end near the port of the second socket 11 and its larger end near the isolation portion 112. The second self-anchoring member 113 is in a tapered sliding fit with the second self-anchoring chamber 110. The taper of the second self-anchoring chamber 110 is 45° to 60°. Preferably, in this embodiment, the taper of the second self-anchoring chamber 110 is 45°; in other embodiments, the taper of the second self-anchoring chamber 110 is 60° or 50°, which is not limited here.

[0030] Reference Figures 1-3 The second pipe fitting 2 has a spigot and a socket at its two ends, respectively. The socket of the second pipe fitting 2 is a first socket 20, which is inserted into the first spigot 10. The first socket 20 contains a first self-anchoring chamber 201, a first sliding chamber 202, a second sliding chamber 203, and a first sealing chamber 204. A partition 205 is fixed between the first sliding chamber 202 and the second sliding chamber 203. The partition 205 is an annular structure and coaxial with the second pipe fitting 2. The partition 205 blocks the first stop ring 103 to prevent the first sliding segment 101 from entering the second sliding chamber 203. The first sliding chamber 202 corresponds to the first sliding segment 101, and the second sliding chamber 203 corresponds to the second sliding segment 102. The length of the second sliding segment 102 is greater than or equal to the length of the first sliding segment 101. The first sliding chamber 202 is disposed between the first self-anchoring chamber 201 and the partition portion 205, and the first sealing chamber 204 is disposed between the partition portion 205 and the second sliding chamber 203. A first self-anchoring member 206 is disposed within the first self-anchoring chamber 201, which is used to anchor the first socket 10. Furthermore, the first self-anchoring member 206 also serves to block the first stop ring 103, preventing the first sliding section 101 from moving out of the first socket 20. A first sealing member 207, which is a sealing ring, is fixed within the first sealing chamber 204 and is sealed to the second sliding section 102. This first sealing member 207 is a sealing ring used to seal against the outer wall of the first socket 10.

[0031] Reference Figures 1-3 Along the axial direction of the second pipe fitting 2, the first sealing chamber 204 is located at the rear end of the first self-anchoring chamber 201. After the first sealing member 207 is sealed and connected to the outer wall of the first socket 10, it can effectively prevent the liquid or gas in the first pipe fitting 1 from being transmitted to the first self-anchoring chamber 201, and prevent the liquid or gas in the first pipe fitting 1 from corroding the first self-anchoring member 206, thereby effectively improving the service life of the first self-anchoring member 206.

[0032] Reference Figures 1-3The first self-anchoring chamber 201 is a conical chamber. The smaller end of the first self-anchoring chamber 201 is close to the port of the first socket 20, and the larger end of the first self-anchoring chamber 201 is close to and communicates with the first sliding chamber 202. The first self-anchoring member 206 is in a tapered sliding fit with the first self-anchoring chamber 201. The taper of the first self-anchoring chamber 201 is 45° to 60°. Preferably, in this embodiment, the taper of the first self-anchoring chamber 201 is 45°; in other embodiments, the taper of the first self-anchoring chamber 201 is 60° or 50°, which is not limited here.

[0033] Reference Figure 1 , Figure 2 , Figure 4 and Figure 7 , Figure 8 The second pipe fitting 2 has a second spigot 21, which is used to connect with the socket (second pipe socket 4) of the second pipe section at the joint of the two pipe sections. A second stop ring 210 is fitted and fixed on the outer wall of the second spigot 21 and is welded to the outer wall of the second spigot 21. An isolation part 112 is fixed between the second self-anchoring chamber 110 and the second sealing chamber 111. The isolation part 112 is coaxial with the second pipe fitting 2. An annular groove 115 for accommodating the second stop ring 210 can be formed between the isolation part 112 and the second self-anchoring member 113. The second self-anchoring member 113 is also used to block the second stop ring 210 to prevent the second spigot 21 from moving out of the second socket 11 along the axial direction of the first pipe fitting 1 or the second pipe fitting 2. Since the second self-anchor 113 slides along the taper within the second self-anchor chamber 110, the aforementioned annular groove 115 can be formed between the second self-anchor 113 and the isolation portion 112.

[0034] The second socket 11 has the same socket structure as the second section of the pipeline; the second spigot 21 has the same spigot structure as the first section of the pipeline.

[0035] It should be noted that both the first self-anchoring member 206 and the second self-anchoring member 113 use existing structures.

[0036] The following describes the workflow of connecting the first pipe fitting 1 and the second pipe fitting 2: When connecting the first pipe fitting 1 and the second pipe fitting 2, the first spigot 10 is inserted into the first socket 20. During the process of inserting the first spigot 10 into the first socket 20, the first stop ring 103 on the outer wall of the first spigot 10 pushes the first self-anchoring member 206 from the small end to the large end of the first self-anchoring chamber 201, so that the first stop ring 103 can smoothly pass through the first self-anchoring member 206 and enter the first sliding chamber 202. When the first stop ring 103 moves to abut against the partition end, the first sealing member 207 seals the second sliding section 102, completing the insertion of the first spigot 10 and the first socket 20. The first sealing element 207 is always sealed to the first socket 10. When the first pipe 1 and the second pipe 2 are forced to move in opposite directions under the action of external force, the first stop ring 103 moves along the axial direction of the first pipe 1 to abut against the first self-anchoring element 206, thereby forcing the first self-anchoring element 206 to anchor the first socket 10 and prevent the first pipe 1 and the second pipe 2 from separating.

[0037] Therefore, when the first pipe fitting 1 is connected to the second pipe fitting 2, the spigot of the first pipe fitting 1 is inserted into the socket of the second pipe fitting 2 to form the interface for the connection between the first pipe fitting 1 and the second pipe fitting 2. After the connection between the first pipe fitting 1 and the second pipe fitting 2 is completed, the first sliding section 101 is located in the first sliding chamber 202, the second sliding section 102 is located in the second sliding chamber 203, the first stop ring 103 abuts against the end wall, and the first sealing element 207 is sealed on the outer wall of the first spigot 10. When the foundation settlement is too large, that is, under the action of external force, the first pipe fitting 1 is forced to move relative to the second pipe fitting 2, so that the first stop ring 103 moves along the axial direction of the first pipe fitting 1 toward the direction of the first self-anchoring element 206. When the first self-anchoring element 206 moves to abut against the first self-anchoring element 206, it prevents the second sliding section 102 from moving out of the first socket 20 along the axial direction of the first pipe fitting 1. In this way, when the foundation settles, the interface connecting the first pipe fitting 1 and the second pipe fitting 2 can be extended, avoiding the interface from bearing greater pull-out force, thereby effectively preventing the interface from being pulled out or cracked.

[0038] Of course, in other embodiments, after the first pipe 1 and the second pipe 2 are connected, the first stop ring 103 may not abut against the partition 205 in the first sliding chamber 202. That is, it can be understood that the first stop ring 103 may be located in the middle of the first sliding chamber 202.

[0039] This section explains the workflow for connecting two pipeline segments using a combination pipe fitting: When connecting two pipeline segments using a combination pipe fitting, the spigot (second spigot 21) of the second fitting 2 in the combination pipe fitting is connected to the socket of the second pipeline segment. Then, the first fitting 1 of the combination pipe fitting is slid, and the socket (second socket 11) of the first fitting 1 in the combination pipe fitting is connected to the spigot of the first pipeline segment by utilizing the movement distance of the first fitting 1 relative to the second fitting 2. This achieves self-anchoring connection of the two pipeline segments, thus enabling simultaneous construction of multiple segments with self-anchoring interfaces along the entire line.

[0040] It should be noted that after the two pipeline sections are connected by the combined pipe fittings, when the pipeline is stretched or sunk due to settlement or earthquakes, the first pipe fitting 1 in the combined pipe fittings can expand and contract relative to the second pipe fitting 2. Therefore, it can effectively prevent the interface between the first pipe fitting 1 and the second pipe fitting 2 from being subjected to excessive pull-out force, which would cause the self-anchoring interface between the first pipe fitting 1 and the second pipe fitting 2 to fail. This increases the safety performance of the self-anchored pipeline, reduces the frequency of pipeline replacement, and ensures the pipeline's delivery effect.

[0041] The working principle of this invention is as follows: the pre-installed combined pipe fitting is placed at the junction of the two pipe sections. First, the socket of the combined pipe fitting (the socket of the first pipe fitting 1) is connected to the spigot of the first pipe section. After the connection is completed, since the first pipe fitting 1 and the second pipe fitting 2 in the combined pipe fitting can expand and contract relative to each other, the second pipe fitting 2 in the combined pipe fitting is stretched to the socket of the second pipe section. The spigot of the combined pipe fitting (the spigot of the second pipe fitting 2) is then connected to the socket of the second pipe section. In this way, the junction of the two pipe sections can be completed.

[0042] Of course, in other embodiments, the pre-installed combined pipe fittings can be placed at the junction of the two pipe sections. First, the spigot of the combined pipe fitting (the spigot of the second pipe fitting 2) is connected to the socket of the second pipe section. After the connection is completed, the first pipe fitting 1 in the combined pipe fitting is stretched to the spigot of the first pipe section, and the socket of the combined pipe fitting (the socket of the first pipe fitting 1) is connected to the spigot of the first pipe section. This can also complete the junction of the two pipe sections.

[0043] In conclusion: 1. In the combined pipe fitting, the first pipe fitting 1 can move relative to the second pipe fitting 2, such that the first stop ring 103 moves along the axial direction of the first pipe fitting 1 toward the first self-anchoring member 206. When the first self-anchoring member 206 moves to abut against the first self-anchoring member 206, it prevents the second sliding long section 102 from moving out of the first socket 20 along the axial direction of the first pipe fitting 1. That is, when subjected to axial external force, the interface connecting the first pipe fitting 1 and the second pipe fitting 2 can elongate, avoiding the interface from bearing greater pull-out force, thereby preventing the interface from being pulled out or cracked.

[0044] 2. When the combined pipe fitting connects the joint of two pipeline sections, if the pipeline is stretched or sunk due to settlement or earthquake, the first pipe fitting 1 in the combined pipe fitting can expand and contract relative to the second pipe fitting 2. Therefore, it can effectively avoid the joint being subjected to excessive pull-out force, which would cause the joint self-anchoring to fail. This increases the safety performance of the self-anchored pipeline, reduces the frequency of pipeline replacement, and improves the stability of pipeline operation.

[0045] 3. Since the first pipe fitting 1 in the combined pipe fitting can extend and retract relative to the second pipe fitting 2, when connecting two pipeline sections, the installed combined pipe fitting is placed at the joint of the two pipeline sections, and one end of the combined pipe fitting is connected to one pipeline. After the connection is completed, the other end of the combined pipe fitting is stretched to connect with the other pipeline section to achieve pipeline docking. In this way, multiple sections of self-anchored interfaces can be constructed simultaneously, the construction progress is fast, the construction efficiency of the pipeline is improved, the safety performance of the self-anchored pipeline is increased, the replacement frequency of the pipeline is reduced, and the stable operation of the pipeline is guaranteed.

[0046] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A self-anchoring pipeline butt-joining composite pipe, characterized in that, The utility model relates to a pipe joint, comprising: a first pipe element having a first socket with a first sliding length and a second sliding length, a first stop ring being fixed on the outer wall of the first socket between the first sliding length and the second sliding length; a second pipe element having a first spigot for being inserted into the first socket, the first spigot having a first self-anchoring chamber, a first sliding chamber, a second sliding chamber, and a first sealing chamber, a partition being arranged between the first sliding chamber and the second sliding chamber, the partition being used to block the first stop ring to prevent the first sliding length from entering the second sliding chamber, the first sliding chamber being arranged between the first self-anchoring chamber and the partition, the first sealing chamber being arranged between the partition and the second sliding chamber, a self-anchoring element being arranged in the self-anchoring chamber, the self-anchoring element being used to anchor the first socket and block the first stop ring to prevent the second sliding length from moving out of the first spigot, and a first sealing element being arranged in the first sealing chamber to be sealingly connected with the second sliding length.

2. A self-anchoring pipeline butt-joined composite pipe according to claim 1, wherein, The first pipe element has a second spigot for being connected with the socket of a first pipe at a joint between two pipes, and the second pipe element has a second socket for being inserted into the spigot of a second pipe at the joint between the two pipes, the second spigot having a second self-anchoring chamber and a second sealing chamber, the second sealing chamber having a second sealing element for being sealingly connected with the socket of the first pipe, and the second self-anchoring chamber having a second self-anchoring element for anchoring the socket of the first pipe.

3. A self-anchoring pipeline butt-joined composite pipe according to claim 2, wherein, The outer wall of the second socket is sleeved with a second stop ring, a separation part is arranged between the second self-anchoring chamber and the second sealing chamber, an annular groove for accommodating the second stop ring can be formed between the second self-anchoring element and the separation part, and the second self-anchoring element is used to block the second stop ring to prevent the second socket from moving out of the second spigot along the axial direction of the first pipe element or the second pipe element.

4. A self-anchoring pipeline butt-joined composite pipe according to claim 3, wherein, The second self-anchoring chamber is a tapered chamber, the small end of the second self-anchoring chamber is close to the port of the second spigot, the large end of the second self-anchoring chamber is close to the separation part, and the second self-anchoring element is in tapered sliding fit with the second self-anchoring chamber to form the annular groove between the second self-anchoring element and the separation part.

5. A self-anchoring pipeline butt-joined composite pipe according to claim 3, wherein, The second sealing chamber is close to the end face of the second spigot, and the second self-anchoring chamber is close to the end face of the second socket.

6. A self-anchoring pipeline butt-joined composite pipe according to claim 1, wherein, The first self-anchoring chamber is a tapered chamber, the small end of the first self-anchoring chamber is close to the port of the first spigot, the large end of the first self-anchoring chamber is close to the first sliding chamber and communicates with the first sliding chamber, and the first self-anchoring element is in tapered sliding fit with the first self-anchoring chamber.

7. A self-anchoring pipeline butt-joining composite pipe according to claim 1, characterized in that, The first stop ring is welded on the outer wall of the first socket.

8. A self-anchoring pipeline butt-joining composite pipe according to claim 3, characterized in that, The second stop ring is welded on the outer wall of the second socket.

9. A self-anchoring pipeline butt-joining composite pipe according to claim 1, characterized in that, The length of the second sliding length is greater than or equal to the length of the first sliding length.

10. A self-anchoring pipeline butt-joining composite pipe according to claim 4 or 6, characterized in that, The taper of the tapered chamber is 45°-60°.

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