Self-anchoring structure for dragging pipe

Abstract

The self-anchoring structure comprises an inserting opening, a bellmouth, a protruding piece, a retaining ring and an elastic piece with elasticity, the inserting opening is inserted into the bellmouth, the protruding piece is fixedly installed on the outer surface of the inserting opening, an adjusting groove which is a groove is formed in the inner surface of the bellmouth, the retaining ring and the elastic piece are both installed in the adjusting groove, and the elastic piece is fixedly installed on the protruding piece. The retaining ring is sleeved with the elastic piece, the retaining ring can retreat towards the interior of the adjusting groove under the action of external force to extrude the elastic piece so as not to interfere the protruding piece to enter the bell mouth, the elastic piece can push the retaining ring based on the elastic force of the elastic piece so that the retaining ring can partially stretch out of the adjusting groove, and the part, stretching out of the adjusting groove, of the retaining ring can make contact with the protruding piece and transmit thrust. And the pushing force realizes sequential dragging of the adjacent pipes. According to the utility model, the pipes can be dragged in sequence, the adjacent pipes are allowed to deflect, the required parts are simple, the installation is simple, the overall cost is lower, and the interface strength is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pipe material technical field, specifically is a kind of self-anchored structure of pipe material. BACKGROUND

[0002] Trenchless refers to the laying, replacing and repairing of various underground pipelines under the condition of minimal excavation (generally referring to small-area excavation at the entrance and exit). When laying pipe material in trenchless engineering, the adjacent two pipes need to be connected, and the connecting interface of the adjacent two pipes forms a self-anchored structure, so that the pipe material is pulled into the installation channel in sequence. If the self-anchored structure fails during the pulling process, the adjacent pipe materials will be disconnected, and the pipe material that has been pulled into the hole needs to be pulled out again, connected and then pulled from the beginning. This greatly reduces the construction efficiency and increases the construction cost. In order to improve the strength of the connecting interface, some existing self-anchored structures are complex. However, the connection of adjacent pipe materials is carried out and completed on site, and the on-site equipment and the technical level of construction personnel are limited, so it is best to have high strength and simple connection of the connecting interface of adjacent pipe materials. SUMMARY

[0003] In view of the above problems existing in the prior art, the purpose of the utility model is to provide a self-anchored structure for pulling pipe material, which can realize the sequential pulling of pipe material, allow the deflection between adjacent pipe materials, require simple components and simple installation, have low overall cost, high interface strength, greatly reduce the probability of rework due to interface disconnection during the construction process, have low requirements for installation equipment and personnel technical level, and be suitable for installation on site.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0005] A self-anchored structure for pulling pipe material, comprising a spigot and a socket, the spigot is inserted into the socket, the self-anchored structure further comprises a protruding piece, a retainer ring and an elastic piece with elasticity, the protruding piece is an annular structure, the protruding piece is coaxially fixedly installed on the outer surface of the spigot, the inner surface of the socket is provided with an adjusting groove which is a groove, the retainer ring and the elastic piece are both installed in the adjusting groove, the retainer ring comprises at least two arc-shaped unit pieces, the unit pieces of the retainer ring can be sequentially spliced into a circular ring structure, the elastic piece is sleeved outside the retainer ring, the width of the retainer ring is less than the width of the adjusting groove, so that there is a gap between the retainer ring and the side wall of the adjusting groove, the retainer ring can retreat and extrude the elastic piece under the action of external force to not interfere with the protruding piece entering the socket, the elastic piece can push the retainer ring based on the elastic force of itself, so that the retainer ring partially extends out of the adjusting groove, and the part of the retainer ring extending out of the adjusting groove can contact the protruding piece and transmit a pushing force, the pushing force is an axial pushing force, and the sequential pulling of adjacent pipe materials is realized.

[0006] As a further improvement of the above technical scheme:

[0007] The inner diameter of the circular annular structure formed by the annular stop ring is smaller than the outer diameter of the convex piece.

[0008] The inner wall of the socket is sequentially provided with a first avoiding groove, an adjusting groove, a second avoiding groove and a blocking part from the socket end face to a direction away from the socket end face, the first avoiding groove and the second avoiding groove are used for avoiding the convex piece, so that the convex piece can enter the second avoiding groove after the spigot is inserted into the socket, the inner diameter of the socket at the adjusting groove, the outer diameter of the annular structure formed by the unit elements of the stop ring, and the inner diameter of the socket at the first avoiding groove are sequentially reduced, the inner diameter of the socket at the first avoiding groove is not smaller than the inner diameter of the socket at the second avoiding groove, and the inner diameter of the socket at the second avoiding groove, the outer diameter of the convex piece, the inner diameter of the socket at the blocking part and the outer diameter of the spigot are sequentially reduced.

[0009] The width of the convex piece is smaller than the width of the second avoiding groove, the width of the convex piece refers to the axial dimension of the convex piece, and the width of the second avoiding groove refers to the dimension of the second avoiding groove in the axial direction of the socket.

[0010] The end face of the stop ring facing the opening of the socket is provided with an inclined surface inclined upward to the direction of the opening of the socket.

[0011] The elastic member is a rubber ring.

[0012] The self-anchoring structure further comprises a sealing ring for realizing sealing, and the sealing ring is compressed between the spigot and the socket.

[0013] The bottom of the adjusting groove is uneven.

[0014] The self-anchoring structure has the advantages that:

[0015] (1) The stop ring and the convex piece can contact and transmit force, realizing the sequential dragging of the pipe, the convex piece is welded on the spigot, the stop ring is radially clamped between the elastic member and the spigot and axially limited in the adjusting groove, so that the self-anchoring structure is stable and has high strength as a whole, and the axial and radial spaces of the socket are fully utilized, the stop ring, the convex piece and the elastic member are located in the socket, and the forward resistance of the pipe is not increased.

[0016] (2) The stop ring comprises at least two arc-shaped unit elements, the stop ring can be pushed back into the adjusting groove during the process that the spigot is inserted into the socket, and the stop ring is automatically pushed out by the elastic member after the spigot and the convex piece are in place, realizing the anchoring of the spigot and the socket, and these designs make the connection and installation of the self-anchoring structure simpler.

[0017] (3) The width of the stop ring is slightly smaller than the width of the adjusting groove, so that there is a gap between the stop ring and the side wall of the adjusting groove, the space between the stop ring and the elastic member can exchange gas with the external environment when the elastic member is extruded and restored, and the compression and restoration of the elastic member can be smoothly performed.

[0018] (4) the gap between the inner wall of the socket at the first avoiding groove and the spigot, the gap between the convex piece and the inner wall of the socket at the second avoiding groove, and the elasticity of the elastic piece, which allow the adjacent pipes to deflect, so that the pipes can deflect under external force during construction and use, improving the flexibility and applicability of the pipes.

[0019] (5) the self-anchoring structure is firm, the required components are simple, the installation is simple, the overall cost is low, the interface strength is high, the probability of rework due to the disconnection of the interface during construction is greatly reduced, the technical level of the installation equipment and personnel is low, and the self-anchoring structure is suitable for installation at the construction site. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a pipe structure schematic diagram of the embodiment one of the utility model.

[0021] Figure 2 is a self-anchoring structure schematic diagram of the embodiment one of the utility model.

[0022] Figure 3 is a self-anchoring structure socket insertion socket process state schematic diagram of the embodiment one of the utility model.

[0023] Figure 4 is a self-anchoring structure socket and socket relative deflection schematic diagram of the embodiment one of the utility model.

[0024] Figure 5 is a pipe structure schematic diagram of the embodiment two of the utility model.

[0025] Figure 6 is a self-anchoring structure schematic diagram of the embodiment two of the utility model.

[0026] Figure 7 is a self-anchoring structure socket insertion socket process state schematic diagram of the embodiment two of the utility model.

[0027] Figure 8 is a self-anchoring structure socket and socket relative deflection schematic diagram of the embodiment two of the utility model.

[0028] Figure 9 is Figure 5 the A enlarged schematic diagram.

[0029] Reference signs: 1, socket, 2, socket, 21, first avoiding groove, 22, adjusting groove, 221, first step, 222, second step, 223, special-shaped convex, 224, third step, 225, fourth step, 23, second avoiding groove, 24, blocking part, 25, sealing groove, 3, pipe body, 4, convex piece, 5, stop ring, 6, elastic piece, 7, sealing ring. DETAILED DESCRIPTION

[0030] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0031] For ease of description, spatially relative terms such as "above," "above," "on the upper surface of," and "upper" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in a drawing is inverted, a device described as "above" or "on top of" another device or structure would then be positioned as "below" or "below" the other device or structure. Thus, the exemplary term "above" can include both the "above" and "below" orientations. The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0032] Example 1:

[0033] A self-anchoring structure for pulling pipes, such as Figure 1 As shown, the pipe includes a socket 1, a pipe body 3 and a socket 2 which are coaxially connected in sequence. The inner diameter and outer diameter of the socket 1 are respectively the same as the inner diameter and outer diameter of the pipe body 3. A protrusion 4 is fixedly installed on the outside of the socket 1.

[0034] In this embodiment, the protrusion 4 is a ring-shaped structure made of metal. The protrusion 4 is coaxially fixedly sleeved on the outer surface of the socket 1, that is, the inner diameter of the protrusion 4 is equal to the outer diameter of the socket 1.

[0035] In this embodiment, the protruding member 4 is welded to the socket 1 .

[0036] For the socket 2, the inner wall of the socket 2 of the same pipe is sequentially provided with a first avoiding groove 21, an adjusting groove 22, a second avoiding groove 23, a blocking part 24 and a sealing groove 25 from the end face of the socket 2 towards the pipe body 3. The end face of the socket 2 refers to the end face of the end of the socket 2 away from the pipe body 3, or the end face of the opening end. The first avoiding groove 21, the adjusting groove 22, the second avoiding groove 23 and the sealing groove 25 are all equivalent to grooves provided on the inner wall of the socket 2, i.e. concave from the inner wall of the socket 2, and each groove is a groove along a circumference of the inner wall of the socket 2, and the blocking part 24 is equivalent to a part without concave, which is the initial inner wall of the socket 2. Therefore, the inner diameter of the socket 2 at the first avoiding groove 21, the inner diameter of the socket 2 at the adjusting groove 22, the inner diameter of the socket 2 at the second avoiding groove 23 and the inner diameter of the socket 2 at the sealing groove 25 are all greater than the inner diameter of the socket 2 at the blocking part 24.

[0037] In the embodiment, the inner diameter of the socket 2 at the adjusting groove 22 is greater than the inner diameter of the socket 2 at the first avoiding groove 21 and the inner diameter of the socket 2 at the second avoiding groove 23, and the inner diameter of the socket 2 at the first avoiding groove 21 is not less than the inner diameter of the socket 2 at the second avoiding groove 23.

[0038] The pipe can be a socket pipe or a straight pipe or other special-shaped pipe.

[0039] In the embodiment, the pipe is a socket pipe.

[0040] When two adjacent pipes are connected, the spigot 1 of one pipe is inserted into the socket 2 of the other pipe, and in combination with the cooperation of other auxiliary parts, the self-anchoring structure is formed.

[0041] The self-anchoring structure, as shown in Figure 2 , comprises a spigot 1, a socket 2, a protruding part 4, a retainer ring 5, an elastic part 6 and a sealing ring 7. The spigot 1 is inserted into the socket 2, and the spigot 1 and the socket 2 of the self-anchoring structure are respectively the spigot 1 and the socket 2 of two adjacent pipes, and the protruding part 4 on the spigot 1 enters the socket 2 and the second avoiding groove 23.

[0042] The first avoiding groove 21 and the second avoiding groove 23 are used for avoiding the protruding part 4, so that after the spigot 1 is inserted into the socket 2, the protruding part 4 can enter the second avoiding groove 23. The outer diameter of the protruding part 4 is less than the inner diameter of the socket 2 at the second avoiding groove 23 and greater than the inner diameter of the socket 2 at the blocking part 24. The outer diameter of the spigot 1 is less than the inner diameter of the socket 2 at the blocking part 24.

[0043] The adjusting groove 22 is used for installing the retainer ring 5 and the elastic part 6.

[0044] The stop ring 5 comprises at least two arc-shaped single elements, and the single elements of the stop ring 5 are sequentially spliced into a circular ring structure, the inner diameter of the circular ring structure is smaller than the outer diameter of the convex part 4, the inner diameter of the circular ring structure can be smaller than, equal to or greater than the outer diameter of the socket 1, and the outer diameter of the circular ring structure is greater than the inner diameter of the socket 2 at the first avoiding groove 21 and the inner diameter of the socket 2 at the second avoiding groove 23, and smaller than the inner diameter of the socket 2 at the adjusting groove 22.

[0045] Preferably, the stop ring 5 is composed of two or three arc-shaped single elements.

[0046] In the embodiment, the inner diameter of the circular ring structure spliced by the single elements of the stop ring 5 is equal to the outer diameter of the socket 1.

[0047] The width of the stop ring 5 is smaller than the width of the adjusting groove 22, and the width of the convex part 4 is smaller than the width of the second avoiding groove 23, wherein the width of the stop ring 5 refers to the axial dimension of the stop ring 5, the width of the convex part 4 refers to the axial dimension of the convex part 4, the width of the adjusting groove 22 refers to the dimension of the adjusting groove 22 in the axial direction of the socket 2, and the width of the second avoiding groove 23 refers to the dimension of the second avoiding groove 23 in the axial direction of the socket 2.

[0048] The elastic element 6 is a ring structure with elasticity, and in the embodiment, the elastic element 6 is a rubber ring.

[0049] Both the stop ring 5 and the elastic element 6 are installed in the adjusting groove 22, and the elastic element 6 is sleeved on the outside of the stop ring 5. When the elastic element 6 is not subjected to other external force or is only subjected to the pressure caused by the gravity of the stop ring 5, the elastic element 6 is in a natural expansion state or a slightly compressed state, at this time, it occupies a larger space in the adjusting groove 22, so that part of the stop ring 5 extends out of the adjusting groove 22 and part of the stop ring 5 is still located in the adjusting groove 22.

[0050] When the stop ring 5 extends out of the adjusting groove 22, the stop ring 5 can contact the socket 1 and the convex part 4. Specifically, the inner wall of the stop ring 5 contacts the outer surface of the socket 1, and one end surface of the stop ring 5 contacts the convex part 4 and can transmit a pushing force, which is an axial pushing force, to realize the sequential pulling of adjacent pipes. At this time, the stop ring 5 is equivalent to being clamped between the elastic element 6 and the socket 1. The stop ring 5 is a complete ring, rather than a few scattered block structures arranged on the same circular ring. The stop ring 5 is a complete ring, so that the one end surface of the convex part 4 is completely in contact with the stop ring 5, and the stress area can cover the entire end surface of the convex part 4. Compared with the scattered block structures, when the stress is the same, the contact area between the stop ring 5 and the convex part 4 is larger, the stress is more uniform, the local stress is smaller, and the structure is more stable and firm.

[0051] When the retainer ring 5 is subjected to an external force in the radial direction towards the elastic member 6, the retainer ring 5 moves towards the elastic member 6 and presses the elastic member 6, and the retainer ring 5 gradually retreats into the adjusting groove 22. After the retainer ring 5 retreats towards the adjusting groove 22, the protruding member 4 can smoothly enter the second avoiding groove 23 without being blocked and interfered by the retainer ring 5.

[0052] In this embodiment, the width of the retainer ring 5 is slightly smaller than the width of the adjusting groove 22, so that there is a gap between the retainer ring 5 and the side wall of the adjusting groove 22, which facilitates the compression and recovery of the elastic member 6 and enables the space between the retainer ring 5 and the elastic member 6 to exchange gas with the external environment, and the compression and recovery of the elastic member 6 can be smoothly performed.

[0053] Further, in order to ensure the stability of the elastic member 6, the inner diameter of the corresponding socket 2 at each part of the bottom of the adjusting groove 22 is not equal everywhere. The bottom of the adjusting groove 22 refers to the inner wall of the socket 2 occupied by the adjusting groove 22, which is the circumferential inner wall of the socket 2, not the inner wall parallel to the radial direction.

[0054] In this embodiment, along the axial direction of the socket 2, the middle part of the bottom of the adjusting groove 22 is concave. In other words, along the axial direction of the socket 2, the inner diameter of the socket 2 at the middle part of the bottom of the adjusting groove 22 is larger than that at both sides of the bottom. The middle part and both sides of the bottom of the adjusting groove 22 each have the shape of a cylindrical outer surface.

[0055] The above-mentioned arrangement of the bottom of the adjusting groove 22 is to limit the elastic member 6, which will be partially embedded in the concave part of the middle part of the bottom of the adjusting groove 22, thereby ensuring the stability of the overall position of the elastic member 6 and the uniformity of the stress on the elastic member 6.

[0056] The sealing groove 25 is used to install the sealing ring 7 to achieve sealing after the connection of the two adjacent pipes, and the sealing ring 7 is compressed between the spigot 1 and the socket 2.

[0057] Based on the above structure, when connecting the adjacent pipes, first install the sealing ring 7 in the sealing groove 25 of the first pipe, and then install the elastic member 6 and the retainer ring 5 in the adjusting groove 22 of the first pipe in sequence. Then insert the spigot 1 of the second pipe into the socket 2. During the insertion of the spigot 1 into the socket 2, the protruding member 4 contacts and pushes open each unit element of the retainer ring 5, causing each unit element of the retainer ring 5 to retreat towards the adjusting groove 22, which is equivalent to the expansion of the retainer ring 5, and the retainer ring 5 simultaneously presses the elastic member 6, as shown in Figure 3 .

[0058] When the protruding member 4 passes through the retainer ring 5 and enters the second avoiding groove 23, the pressing force of the protruding member 4 on the retainer ring 5 disappears, the elastic member 6 recovers and expands, and pushes each unit element of the retainer ring 5, until the retainer ring 5 partially protrudes out of the adjusting groove 22, and the inner wall of the retainer ring 5 contacts the outer surface of the spigot 1, and the retainer ring 5 is clamped between the elastic member 6 and the spigot 1, as shown in Figure 2as shown.

[0059] In order to facilitate the protruding member 4 to push open the stop ring 5 during the insertion of the spigot 1 into the socket 2, the end surface of the stop ring 5 facing the opening of the socket 2 is wedge-shaped or chamfered. When the protruding member 4 contacts the chamfered surface and continues to advance, the stop ring 5 will move towards the adjusting groove 22.

[0060] In order to uniformly compress the elastic member 6, the outer surface of the stop ring 5 contacting the elastic member 6 is arc-shaped. Specifically, in the axial direction of the stop ring 5, the cross-sectional shape of the outer surface of the stop ring 5 is arc-shaped.

[0061] The end surface of the stop ring 5 away from the opening of the socket 2 is a plane parallel to the radial direction, which can contact the protruding member 4 and transmit the thrust force between them, which is axial, to realize the sequential pulling of the pipes.

[0062] When the spigot 1 and the socket 2 are coaxial, there is a gap between the inner wall of the socket 2 at the first avoiding groove 21 and the spigot 1, there is a gap between the protruding member 4 and the inner wall of the socket 2 at the second avoiding groove 23, and the elastic member 6 has a certain elasticity, which allows the adjacent two pipes to have a certain degree of relative deflection, such as Figure 4 As shown, the position state of the spigot 1 after the pipe where the spigot 1 is located deflects clockwise relative to the pipe where the socket 2 is located. Obviously, the spatial design of the second avoiding groove 23 allows the protruding member 4 to move in the second avoiding groove 23 in response to the deflection of the spigot 1. The state after counterclockwise deflection is axially symmetrical relative to the clockwise deflection. In this way, the self-anchoring structure can adapt to the relative deflection of the adjacent two pipes due to external factors during the pipe construction process or use.

[0063] Example Two:

[0064] The shape of the bottom of the adjusting groove 22 in this embodiment is different from that in Example One. As shown, Figures 5~9 The bottom of the adjusting groove 22 is shaped, specifically, in the axial direction of the socket 2, from the end surface of the socket 2 towards the direction away from the end surface of the socket 2, the bottom of the adjusting groove 22 includes the first step 221, the second step 222, the shaped protrusion 223, the third step 224, and the fourth step 225 arranged in sequence, wherein the first step 221, the second step 222, the third step 224, and the fourth step 225 are cylindrical surfaces, and the shaped protrusion 223 protrudes from the second step 222 and the third step 224. In the cross section parallel to the axial direction of the socket 2, the shaped protrusion 223 is arc-shaped.

[0065] The inner diameter of the socket 2 at the first step 221 is equal to the inner diameter of the socket 2 at the fourth step 225, the inner diameter of the socket 2 at the second step 222 is equal to the inner diameter of the socket 2 at the third step 224, the inner diameter of the socket 2 at the first step 221 is smaller than the inner diameter of the socket 2 at the second step 222, and the inner diameter of the socket 2 at the special-shaped protrusion 223 is smaller than the inner diameter of the socket 2 at the second step 222 and larger than the inner diameter of the socket 2 at the first step 221.

[0066] Finally, it is necessary to point out that: the above examples are only used to make further detailed description of the technical scheme of the utility model, and cannot be understood as the limitation of the protection scope of the utility model. Some non-essential improvements and adjustments made by the skilled in the art according to the above content of the utility model belong to the protection scope of the utility model.

Claims

1. A self-anchoring structure for pulling a pipe, comprising a spigot (1) and a socket (2), the spigot (1) being inserted into the socket (2), characterized in that, The self-anchoring structure further comprises a protruding piece (4), a retreat-stop ring (5) and an elastic piece (6) with elasticity, the protruding piece (4) is in an annular structure, the protruding piece (4) is fixedly installed coaxially on the outer surface of the socket (1), the inner surface of the spigot (2) is provided with an adjusting groove (22) in the form of a groove, the retreat-stop ring (5) and the elastic piece (6) are both installed in the adjusting groove (22), the retreat-stop ring (5) comprises at least two arc-shaped single elements, the single elements of the retreat-stop ring (5) can be sequentially spliced into a circular annular structure, the elastic piece (6) is sleeved on the outside of the retreat-stop ring (5), the width of the retreat-stop ring (5) is smaller than the width of the adjusting groove (22), so that there is a gap between the retreat-stop ring (5) and the side wall of the adjusting groove (22), under the action of an external force, the retreat-stop ring (5) can retreat back into the adjusting groove (22) to press the elastic piece (6) so as to not interfere with the protruding piece (4) entering the spigot (2), the elastic piece (6) can push the retreat-stop ring (5) based on the elastic force of the elastic piece (6), so that the retreat-stop ring (5) partially extends out of the adjusting groove (22), the part of the retreat-stop ring (5) extending out of the adjusting groove (22) can contact the protruding piece (4) and transmit a pushing force, the pushing force is an axial pushing force, and the adjacent pipes are sequentially pulled.

2. A self-anchoring structure according to claim 1, characterized in that: The inner diameter of the circular annular structure where the retreat-stop ring (5) is located is smaller than the outer diameter of the protruding piece (4).

3. A self-anchoring structure according to claim 2, wherein: The inner wall of the spigot (2) is sequentially provided with a first avoiding groove (21), the adjusting groove (22), a second avoiding groove (23) and a blocking part (24) from the end face of the spigot (2) towards the direction away from the end face of the spigot (2), the first avoiding groove (21) and the second avoiding groove (23) are used for avoiding the protruding piece (4), so that after the socket (1) is inserted into the spigot (2), the protruding piece (4) can enter the second avoiding groove (23), the inner diameter of the spigot (2) at the adjusting groove (22), the outer diameter of the annular structure formed by splicing the single elements of the retreat-stop ring (5), and the inner diameter of the spigot (2) at the first avoiding groove (21) sequentially decrease, the inner diameter of the spigot (2) at the first avoiding groove (21) is not smaller than the inner diameter of the spigot (2) at the second avoiding groove (23), and the inner diameter of the spigot (2) at the second avoiding groove (23), the outer diameter of the protruding piece (4), the inner diameter of the spigot (2) at the blocking part (24) and the outer diameter of the socket (1) sequentially decrease.

4. A self-anchoring structure according to claim 3, wherein: The width of the protruding piece (4) is smaller than the width of the second avoiding groove (23), the width of the protruding piece (4) refers to the axial dimension of the protruding piece (4), and the width of the second avoiding groove (23) refers to the dimension of the second avoiding groove (23) in the axial direction of the spigot (2).

5. A self-anchoring structure according to any one of claims 1 to 4, wherein: The end face of the retreat-stop ring (5) facing the opening of the spigot (2) is provided with an inclined surface inclined upward towards the opening direction of the spigot (2).

6. A self-anchoring structure according to any one of claims 1 to 4, wherein: The elastic piece (6) is a rubber ring.

7. A self-anchoring structure according to any one of claims 1 to 4, wherein: The self-anchoring structure further comprises a sealing ring (7) for realizing sealing, the sealing ring (7) is compressed between the socket (1) and the spigot (2).

8. A self-anchoring structure according to any one of claims 1 to 4, wherein: The groove bottom of the adjusting groove (22) is uneven.

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