Anti-falling structure for dragging pipe

Abstract

The invention discloses an anti-drop structure for dragging a pipe, which comprises a spigot, a pipe body, a bell mouth, a convex piece, a retaining ring, an elastic piece and at least two arc-shaped first half flange pieces, the spigot is inserted into the bell mouth, the outer diameter of the spigot is greater than or equal to that of the pipe body, and the outer diameter of the spigot is greater than or equal to that of the pipe body; a first avoiding groove, a second avoiding groove and a blocking part are sequentially arranged on the inner wall of the bellmouth from the end face to the direction away from the end face of the bellmouth, the protruding piece is fixedly installed on the outer surface of the pipe body, the end face area of the retaining ring is larger than that of the protruding piece, and the first half flange piece covers the end face of the bellmouth and exceeds the inner wall of the end face of the bellmouth in the caliber direction of the bellmouth. The first half flange piece, the retaining ring and the protruding piece make contact in sequence so that axial thrust for dragging adjacent pipes can be transmitted, and the inserting opening and the bellmouth can deflect relative to each other. According to the invention, 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 application belongs to the technical field of pipe materials, and particularly relates to a pipe material dragging-off prevention structure. BACKGROUND

[0002] The pipe dragging technology is a non-excavation underground pipeline laying method, and the non-excavation refers to a new construction technology for laying, replacing and repairing various underground pipelines under the condition of extremely small excavation of the ground surface (generally refers to small-area excavation at the inlet and outlet), which does not hinder traffic, does not destroy green vegetation, and does not affect the normal life and work order of residents. The core process of the pipe dragging technology includes the following steps: a guide drill bit is used to drill a hole according to a designed track, a hole diameter is gradually expanded through a reamer, and finally a pipe material is connected to the tail of the reamer and dragged into the hole, and the pipe materials are sequentially connected and dragged into the hole. When the adjacent pipe materials are connected, the pipe materials themselves are used to form a pipe material dragging-off prevention structure together with other components, so that the adjacent pipe materials are sequentially dragged. However, if the pipe material dragging-off prevention structure fails during the dragging process, the adjacent pipe materials are disconnected from each other, and then the pipe material dragged into the hole needs to be dragged out again, connected again and then dragged from the beginning. Obviously, this greatly reduces the construction efficiency and increases the construction cost. Therefore, the strength of the connection interface between the adjacent pipe materials needs to be large enough to minimize the probability of disconnection of the adjacent two pipes. Moreover, the connection between the adjacent pipe materials is carried out and completed on the construction site, and the on-site equipment and the technical level of the construction personnel are limited, so it is best to make the connection between the adjacent pipe materials simple. Finally, the procurement cost and the construction cost of the connection interface components need to be reduced as much as possible. SUMMARY

[0003] In view of the above problems existing in the prior art, the application aims to provide a pipe material dragging-off prevention structure, which can realize sequential pipe material dragging, allow the adjacent pipe materials to deflect, and has simple components, simple installation, low overall cost, high interface strength, low probability of rework due to interface disconnection during the construction process, low requirement for installation equipment and personnel technical level, and suitability for installation on the construction site.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the application is as follows: The anti-disengagement structure of the pipe comprises a spigot, a pipe body and a socket, the spigot is coaxially connected to one end of the pipe body, the spigot is inserted into the socket, the outer diameter of the spigot is greater than or equal to the outer diameter of the pipe body, the inner wall of the socket is provided with a first avoiding groove, a second avoiding groove and a blocking part in sequence from the end face to the direction away from the end face of the socket, the anti-disengagement structure further comprises a protruding piece, a retainer ring, an elastic piece and at least two arc-shaped first half flange pieces, the annular protruding piece is fixedly installed on the outer surface of the pipe body, when the outer diameter of the spigot is greater than the outer diameter of the pipe body, one end face of the protruding piece contacts the step surface of the spigot, the step surface is a plane parallel to the radial direction of the spigot formed by the protrusion of the spigot on the outer surface of the pipe body, the annular retainer ring is movably sleeved on the outer surface of the pipe body, the end face area of the retainer ring is greater than the end face area of the protruding piece, the first half flange piece covers the end face of the socket and exceeds the inner wall of the end face of the socket in the radial direction of the socket, so that the first half flange piece, the retainer ring and the protruding piece are in contact in sequence to transmit the axial thrust for dragging each other of the adjacent pipes, the retainer ring is limited in the first avoiding groove, the elastic piece is compressed between the inner wall of the socket and the retainer ring, the protruding piece is limited between the retainer ring and the blocking part, when the spigot and the socket are coaxial, the first half flange piece does not contact the pipe body, and the inner wall of the socket does not contact the pipe body, so that the spigot and the socket can be relatively deflected.

[0005] As a further improvement of the above technical solution: Each first half flange piece is spliced into an annular structure, the inner diameter of the annular structure is greater than the outer diameter of the pipe body, the anti-disengagement structure further comprises at least two arc-shaped second half flange pieces, the inner diameter of the annular structure where the second half flange pieces are located is greater than the outer diameter of the pipe body, each second half flange piece covers each splicing gap, and the splicing gap is the splicing position of the adjacent two first half flange pieces.

[0006] The inner diameter of the socket at the first avoiding groove, the outer diameter of the retainer ring, the inner diameter of the socket at the second avoiding groove, the outer diameter of the protruding piece and the inner diameter of the socket at the blocking part and the outer diameter of the spigot are sequentially reduced.

[0007] The width of the retainer ring is not greater than the width of the first avoiding groove, and the width of the protruding piece is less than the width of the second avoiding groove, the width of the retainer ring refers to the axial dimension of the retainer ring, the width of the protruding piece refers to the axial dimension of the protruding piece, the width of the first avoiding groove refers to the dimension of the first avoiding groove in the axial direction of the socket, and the width of the second avoiding groove refers to the dimension of the second avoiding groove in the axial direction of the socket.

[0008] The first half flange piece and the second half flange piece do not exceed the outer wall surface of the socket in the radial direction of the socket.

[0009] The anti-disengagement structure further comprises a plurality of fasteners, the fasteners are inserted into the socket from the end face of the socket in sequence after passing through the second half flange piece and the first half flange piece at the part where the first half flange piece and the second half flange piece are stacked, and the fasteners are inserted into the socket from the end face of the socket after passing through the first half flange piece at the part not covered by the second half flange piece.

[0010] The socket is provided with a fastening hole which is a blind hole for inserting a fastener, and the fastening hole is formed concavely from the end face of the socket.

[0011] The inner wall of the socket is further provided with a sealing groove and a third avoiding groove, the first avoiding groove, the second avoiding groove, the blocking part, the sealing groove and the third avoiding groove are arranged in sequence along the axial direction of the socket, the inner diameter of the socket at the sealing groove, the inner diameter of the socket at the third avoiding groove and the inner diameter of the pipe body are sequentially reduced, and the inner diameter of the socket at the third avoiding groove is not less than the inner diameter of the socket at the blocking part.

[0012] When the outer diameter of the spigot is greater than the outer diameter of the pipe body, the size B of the second avoiding groove in the axial direction of the pipe body, the half H of the difference between the inner diameter of the socket at the second avoiding groove and the outer diameter of the spigot, the inner diameter d1 of the socket at the blocking part and the half h1 of the difference between the outer diameter and the inner diameter of the retainer ring should meet the following requirements when the adjacent two pipes can be relatively deflected and the maximum deflection angle is α. ; ; ; ; Wherein, b is the size of the protruding part in the direction parallel to the central axis, D2 is the outer diameter of the pipe body, h is the half of the difference between the outer diameter and the inner diameter of the protruding part, D1 is the outer diameter of the spigot, t2 is the axial distance between the connection of the sealing groove and the third avoiding groove and the hole bottom of the fastening hole, L1 is the length of the fastening hole, b1 is the size of the retainer ring in the direction parallel to the central axis, d2 is the minimum inner diameter of the socket at the third avoiding groove, and B1 is the size of the first avoiding groove in the axial direction of the pipe body.

[0013] When the outer diameter of the spigot is equal to the outer diameter of the pipe body, the size B of the second avoiding groove in the direction parallel to the central axis of the pipe body, the half H2 of the difference between the inner diameter of the socket at the second avoiding groove and the inner diameter at the blocking part, the half h1 of the difference between the outer diameter and the inner diameter of the retainer ring, and the half H1 of the difference between the inner diameter of the socket at the first avoiding groove and the outer diameter of the spigot should meet the following conditions when the adjacent two pipes can be relatively deflected and the maximum deflection angle is α. ; ; ; ; Wherein, B0 is the maximum axial distance from the one end of the near stop ring of the protruding part before deflection to the one end of the protruding part away from the stop ring after deflection, the axial direction refers to the axial direction of the protruding part before deflection, H0 is the maximum radial distance between the outer wall of the socket before deflection and the outer wall of the protruding part after deflection, the radial direction refers to the radial direction of the protruding part before deflection or the socket, d1 is the inner diameter of the socket at the blocking part, D1 is the outer diameter of the socket, h0 is the maximum radial distance between the inner wall of the second avoiding groove and the inner wall of the stop ring after deflection, the radial direction refers to the radial direction of the protruding part before deflection or the socket, h7 is the natural thickness of the elastic part, that is, half of the difference between the outer diameter and the inner diameter of the elastic part in the natural state without external force.

[0014] The beneficial effects of the present application are: (1) When the outer diameter of the socket is greater than the outer diameter of the pipe body, the first half flange piece, the stop ring, the protruding part, and the socket are sequentially contacted and transmit the force, realize the sequential pulling of the pipe material, the protruding part is welded on the pipe body, and the socket is part of the pipe material body, the strength is large, the pushing force is finally transmitted to the pipe material body, thereby improving the strength and reliability of the whole anti-off structure, and it can be applied to the pulling of large-diameter pipe materials. When the outer diameter of the socket is greater than the outer diameter of the pipe body, the socket and the pipe body are integrally formed, and the processing is easier.

[0015] (2) The end surface area of the stop ring is greater than the end surface area of the protruding part, so that the area that the first half flange piece and the stop ring can contact is larger than the area that the first half flange piece directly contacts with the protruding part, under the same pushing force of the first half flange piece, the stop ring receives smaller pressure and is not easy to be damaged, which helps to improve the use reliability of the anti-off structure. In addition, the outer diameter of the protruding part is smaller than the outer diameter of the stop ring, which is equivalent to the protruding part contacting a part of the stop ring end surface close to the central axis, which is equivalent to weighting the part of the stop ring close to the central axis. When the adjacent two pipes are deflected, the protruding part makes the torque required for the rotation of the stop ring larger, thereby making the stop ring more stable and not easy to be pulled out from the set position.

[0016] (3) The second half flange piece is stacked on the first half flange piece and covers the gap between the adjacent two first half flange pieces, which greatly improves the strength of the second half flange piece and the first half flange piece as a whole.

[0017] (4) The second half flange piece and the first half flange piece have gaps between them and the coaxial pipe body, there are gaps between the socket and the socket outside the sealing ring, the stop ring is movably sleeved on the pipe body, and the elastic part is sleeved outside the stop ring. The combined effect of these designs allows the adjacent pipes to be deflected, so that the pipes can be deflected under external factors during the construction process and the use process, thereby improving the flexibility and applicability of the pipes.

[0018] (5) the inner diameter of the retreat ring is not less than the outer diameter of the pipe body, and the movable sleeve is connected to the outer diameter of the pipe body, and can move and / or rotate relative to the pipe body within a certain range, and has a certain flexibility, so as to better adapt to the relative deflection of the two adjacent pipes, in addition, the elastic element is sleeved outside the retreat ring, so as to ensure the flexibility of the retreat ring and the overall stability of the retreat ring.

[0019] (6) the second half flange piece and the first half flange piece do not exceed the outer wall of the socket in the radial direction, and will not be subjected to forward resistance in the construction process, and the second half flange piece and the first half flange piece can be subjected to other external forces to the maximum extent; the blind hole of the fastener inserted into the socket will not be subjected to the resistance of the pipe material in the construction process because of passing through the socket.

[0020] (7) the anti-disengagement structure needs simple components, simple installation, low overall cost, high interface strength, greatly reduces the probability of rework caused by disengagement of the interface in the construction process, and has low requirements on installation equipment and personnel technical level, and is suitable for installation on the construction site. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a pipe structure schematic diagram of the embodiment one of the present application.

[0022] Figure 2 is an anti-disengagement structure schematic diagram of the embodiment one of the present application.

[0023] Figure 3 is another view structure schematic diagram of Figure 2 .

[0024] Figure 4 is a schematic diagram when the socket and the socket of the anti-disengagement structure of the embodiment one of the present application are relatively deflected.

[0025] Figure 5 is an enlarged schematic diagram of F1 of Figure 4 .

[0026] Figure 6 is an enlarged schematic diagram of F2 of Figure 4 .

[0027] Figure 7 is an enlarged schematic diagram of F3 of Figure 4 .

[0028] Figure 8 is a socket end size schematic diagram of the embodiment one of the present application.

[0029] Figure 9 is an anti-disengagement structure schematic diagram of the embodiment two of the present application.

[0030] Figure 10 is a schematic diagram when the socket and the socket of the anti-disengagement structure of the embodiment two of the present application are relatively deflected.

[0031] Figure 11 is Figure 10 an enlarged schematic view of P1.

[0032] Figure 12 is Figure 10 an enlarged schematic view of P2.

[0033] Figure 13 is Figure 10 an enlarged schematic view of P3.

[0034] Figure 14 is a schematic view of the size of the socket end of the second embodiment of the present application.

[0035] Reference signs: 1, socket, 2, spigot, 21, first avoiding groove, 22, second avoiding groove, 23, blocking part, 24, sealing groove, 25, fastening hole, 26, third avoiding groove, 3, pipe body, 4, protruding piece, 5, retainer ring, 6, elastic piece, 7, first half flange piece, 8, second half flange piece, 9, fastening piece, 10, sealing ring, 11, gasket, 12, socket reinforcing ring. DETAILED DESCRIPTION

[0036] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0037] For the convenience of description, spatial relative terms such as "above", "upper", "top surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "above" other devices or structures will be positioned "below" or "below" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0038] Embodiment I: A structure for preventing the pipe from being pulled out, as shown in Figure 1 , the pipe is a socket pipe, which comprises a socket 1, a pipe body 3 and a spigot 2 connected coaxially in sequence.

[0039] The outer diameter of the spigot 1 is larger than the outer diameter of the pipe body 3, so that the spigot 1 protrudes outward from the surface of the pipe body 3 to form a stepped structure. The end face of the spigot 1 away from the pipe body 3 is the end face of the spigot 1, and the end face or side face of the spigot 1 connected to the pipe body 3 is a stepped face, i.e., the stepped face is formed by the spigot 1 protruding outward from the surface of the pipe body 3, and the plane of the stepped face is parallel to the radial direction of the spigot 1.

[0040] The spigot 1 is sleeved with a spigot reinforcing ring 12 for enhancing the strength of the spigot 1. The spigot reinforcing ring 12 can be integrally arranged with the spigot 1, i.e., the spigot 1 and the spigot reinforcing ring 12 are two layers of metal with the same or different materials, or the spigot reinforcing ring 12 can be separately arranged. When the spigot reinforcing ring 12 is separately arranged, the spigot reinforcing ring 12 is annular, and is generally made of stainless steel and has certain ductility and rigidity. The initial outer diameter of the spigot reinforcing ring 12 is smaller than the inner diameter of the spigot 1. When the spigot reinforcing ring 12 is installed, the spigot reinforcing ring 12 is placed into the spigot 1, and then the spigot reinforcing ring 12 is expanded in diameter by using an expanding device, so that the diameter of the spigot reinforcing ring 12 is expanded until the spigot reinforcing ring 12 is tightly pressed against the inner wall of the spigot 1. The reason why the spigot reinforcing ring 12 can be tightly pressed against the inner wall of the spigot 1 is that, during the expanding process, the inner wall of the spigot 1 is subjected to radial pressure from the expanding device, and after the pressure is removed (i.e., the expanding process is completed), the spigot 1 and the spigot reinforcing ring 12 will have certain elastic recovery. Since the wall thickness of the spigot 1 is large and the spigot 1 is connected to the pipe body, the elastic recovery of the spigot 1 is larger than that of the spigot reinforcing ring 12, so that after the elastic recovery, the spigot reinforcing ring 12 is tightly pressed against the inner wall of the spigot 1.

[0041] The pipe body 3 is externally and fixedly provided with a protruding piece 4, the protruding piece 4 contacts the stepped face of the spigot 1 and protrudes outward from the surface of the spigot 1, and the surface of the spigot 1 refers to the curved outer wall of the spigot 1.

[0042] In this embodiment, the protruding piece 4 is annular and is made of metal, and the protruding piece 4 is coaxially and fixedly sleeved on the outside of the pipe body 3. The inner surface of the protruding piece 4 contacts the outer surface of the pipe body 3, and one end face of the protruding piece 4 contacts the stepped face of the spigot 1. The outer diameter of the protruding piece 4 is larger than the outer diameter of the spigot 1.

[0043] In this embodiment, the protruding piece 4 is welded to the outside of the pipe body 3.

[0044] 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 other auxiliary components, the anti-disengagement structure is formed.

[0045] The anti-disengagement structure, as shown in Figure 2 and 3 includes the spigot 1, the pipe body 3, the socket 2, the protruding piece 4, the retainer ring 5, the elastic member 6, the first half flange piece 7, the second half flange piece 8, the fastener 9, the sealing ring 10, the gasket 11, and the spigot reinforcing ring 12.

[0046] The socket 1 is coaxially connected to one end of the pipe body 3, the socket 1 and the socket 2 of the anti-withdrawal structure are respectively the socket 1 and the socket 2 of the adjacent two pipes, the socket 1 and the pipe body 3 belong to the same pipe, the socket 1 is inserted into the socket 2, and the convex piece 4 enters the socket 2 together.

[0047] The anti-withdrawal ring 5 is a ring-shaped structure made of metal, and is movably sleeved outside the pipe body 3 and located in the socket 2. The inner diameter of the anti-withdrawal ring 5 is not less than the outer diameter of the pipe body 3 and is less than the outer diameter of the convex piece 4, and the outer diameter of the anti-withdrawal ring 5 is greater than the outer diameter of the convex piece 4.

[0048] The anti-withdrawal ring 5 contacts the end face of the convex piece 4 away from the socket 1, in other words, the two end faces of the convex piece 4 respectively contact the stepped surface of the socket 1 and the anti-withdrawal ring 5.

[0049] The inner wall of the socket 2 of the same pipe is sequentially provided with a first avoiding groove 21, a second avoiding groove 22, a blocking part 23, a sealing groove 24 and a third avoiding groove 26 from the end face to the direction of the pipe body 3. The first avoiding groove 21, the second avoiding groove 22, the sealing groove 24 and the third avoiding groove 26 are equivalent to grooves provided on the inner wall of the socket 2, that is, are formed in the inner wall of the socket 2, and the blocking part 23 is equivalent to a part without being concave. Each groove is a groove along a circumference of the 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 second avoiding groove 22 and the inner diameter of the socket 2 at the sealing groove 24 are all greater than the inner diameter of the socket 2 at the blocking part 23. Specifically, the inner diameter of the socket 2 at the first avoiding groove 21, the outer diameter of the anti-withdrawal ring 5, the inner diameter of the socket 2 at the second avoiding groove 22, the outer diameter of the convex piece 4, the inner diameter of the socket 2 at the blocking part 23 and the outer diameter of the socket 1 gradually decrease. The inner diameter of the socket 2 at the sealing groove 24, the inner diameter of the socket 2 at the third avoiding groove 26 and the inner diameter of the pipe body 3 gradually decrease. The inner diameter of the socket 2 at the third avoiding groove 26 is not less than the inner diameter of the socket 2 at the blocking part 23. The inner diameters of the socket 2 at the third avoiding groove 26 can not be completely equal. Specifically, from the end face of the socket 2 to the direction away from the end face of the socket 2, the inner diameters of the socket 2 at the third avoiding groove 26 gradually increase. The first avoiding groove 21 is used for avoiding the anti-withdrawal ring 5, and the second avoiding groove 22 is used for avoiding the convex piece 4, so that after the socket 1 is inserted into the socket 2, the convex piece 4 can enter the second avoiding groove 22, and the anti-withdrawal ring 5 can enter the first avoiding groove 21. The sealing groove 24 is used for installing the sealing ring 10 to realize sealing after the connection of the adjacent two pipes, and the sealing ring 10 is compressed between the socket 1 and the socket 2.

[0050] The elastic piece 6 is located in the first avoiding groove 21, and the elastic piece 6 is compressed between the socket 2 and the anti-withdrawal ring 5. In other words, the elastic piece 6 is sleeved outside the anti-withdrawal ring 5 and inside the socket 2.

[0051] In this embodiment, the elastic piece 6 is a rubber ring.

[0052] The first half flange sheet 7 and the second half flange sheet 8 are both arc-shaped structures, the first half flange sheet 7 is provided with at least two, and the second half flange sheet 8 is also provided with at least two, each first half flange sheet 7 is sequentially spliced into a circular ring and covers the end face of the socket 2. Each second half flange sheet 8 covers a splicing gap, which is the splicing position of two adjacent first half flange sheets 7. In other words, the second half flange sheet 8 does not need to cover all the first half flange sheets 7, but only needs to cover the splicing position of two adjacent first half flange sheets 7. All the second half flange sheets 8 are on the same ring.

[0053] The above arrangement of the first half flange sheet 7 and the second half flange sheet 8 improves the overall connection strength and reliability of the two, and maximally reduces the probability of failure of the first half flange sheet 7 and the second half flange sheet 8 falling off during construction.

[0054] The first half flange sheet 7 and the second half flange sheet 8 both exceed the inner wall of the end face of the socket 2 in the radial direction of the socket 2 to the end face of the one end of the stop ring 5 away from the protruding piece 4, that is, the inner diameter of the ring formed by splicing each first half flange sheet 7 and the inner diameter of the ring where the second half flange sheet 8 is located are both smaller than the outer diameter of the stop ring 5. Specifically, the side of the first half flange sheet 7 away from the second half flange sheet 8 contacts the end face of the one end of the stop ring 5 away from the protruding piece 4, which is equivalent to that the first half flange sheet 7 is blocked by the stop ring 5, the stop ring 5 is blocked by the protruding piece 4, and the protruding piece 4 is blocked by the step formed by the surface of the pipe body 3 of the socket 1, so that the first half flange sheet 7, the stop ring 5, the protruding piece 4 and the socket 1 can sequentially contact and transmit the axial thrust force, and the axial thrust force realizes the sequential pulling of adjacent pipes in the axial direction.

[0055] When the spigot 1 and the socket 2 are coaxial, the first half flange piece 7 and the second half flange piece 8 do not contact the outer wall of the pipe body 3, that is, the inner diameter of the annular formed by the first half flange pieces 7 or the inner diameter of the annular formed by the second half flange pieces 8 is larger than the outer diameter of the pipe body 3. The width of the retainer ring 5 is not larger than the width of the first avoiding slot 21, and the width of the protruding piece 4 is smaller than the width of the second avoiding slot 22. The width of the retainer ring 5 refers to the axial dimension of the retainer ring 5, the width of the protruding piece 4 refers to the axial dimension of the protruding piece 4, the width of the first avoiding slot 21 refers to the axial dimension of the first avoiding slot 21, and the width of the second avoiding slot 22 refers to the axial dimension of the second avoiding slot 22. The minimum inner diameter of the socket 2 is larger than the outer diameter of the spigot 1. That is, when the spigot 1 and the socket 2 are coaxial, there is a gap between the first half flange piece 7, the second half flange piece 8 and the pipe body 3, there is a gap between the spigot 1 and the socket 2, there is a gap between the retainer ring 5 and the wall of the first avoiding slot 21, there is a gap between the protruding piece 4 and the wall of the second avoiding slot 22, and there is a gap between the retainer ring 5 and the pipe body 3 (when the inner diameter of the retainer ring 5 is larger than the outer diameter of the pipe body 3). These gaps allow the adjacent two pipes to relatively deflect to adapt to the relative deflection of the adjacent two pipes due to external factors during the pipe construction process or use process. For example Figure 4 The dashed line shown in the figure represents the position state of the spigot 1 and the pipe body 3 after the pipe where the spigot 1 is located relatively deflects clockwise relative to the pipe where the socket 2 is located. The state after counterclockwise deflection is axially symmetrical relative to the clockwise deflection.

[0056] The first half flange piece 7 and the second half flange piece 8 do not exceed the outer wall of the socket 2 in the radial direction of the socket 2, that is, the outer diameter of the annular formed by the first half flange pieces 7 or the outer diameter of the annular formed by the second half flange pieces 8 is smaller than or equal to the outer diameter at the end face of the socket 2. In this way, during the construction process, the first half flange piece 7 and the second half flange piece 8 will not be subjected to the forward resistance of the surrounding soil in the channel, thereby maximizing the external force on the first half flange piece 7 and the second half flange piece 8 and improving their reliability.

[0057] In the embodiment, two first half flange pieces 7 and two second half flange pieces 8 are provided.

[0058] The fastener 9 is provided in multiple numbers, and the first half flange piece 7 and the second half flange piece 8 are fixed to the socket 2 by the fastener 9. The multiple fasteners 9 are arranged at intervals on the same circular ring. In the portion where the first half flange piece 7 and the second half flange piece 8 are stacked, the fastener 9 is inserted into the socket 2 from the end face of the socket 2 after sequentially penetrating the second half flange piece 8 and the first half flange piece 7. For the region of the first half flange piece 7 not covered by the second half flange piece 8, the fastener 9 is inserted into the socket 2 from the end face of the socket 2 after penetrating the first half flange piece 7.

[0059] Further, the socket 2 is provided with fastening holes 25 which are blind holes for inserting fasteners 9, and the fastening holes 25 are formed from the inner surface of the end surface of the socket 2. One fastener 9 is inserted into each fastening hole 25. The fasteners 9 do not extend out of the socket 2 to the outside, avoiding the fasteners 9 from being subjected to the advancing resistance in the construction process.

[0060] In the embodiment, the fasteners 9 are bolts, and a washer 11 is arranged between the head of the fastener 9 and the first half flange 7 or the second half flange 8.

[0061] In the embodiment, the fasteners 9 are provided with 12.

[0062] In the embodiment, the outer surface of the socket 2 is a smooth connection and transition surface, and the outer diameter of the socket 2 gradually increases in the direction from the pipe body 3 to the socket 2 of the same pipe.

[0063] When two adjacent pipes are installed, the sealing ring 10 is sleeved into the sealing groove 24 of the socket 2 of the first pipe, and the elastic member 6 is sleeved into the first avoiding groove 21, and the stop ring 5 is installed outside the pipe body 3 of the second pipe. When the stop ring 5 is installed, the two arc structures are sleeved outside the pipe body 3, and then the two arc structures are welded to form the annular stop ring 5. Then, the spigot 1 of the second pipe is sleeved into the socket 2 of the first pipe, the stop ring 5 enters the socket 2 to contact the protruding member 4, and the elastic member 6 is compressed between the stop ring 5 and the inner wall of the first avoiding groove 21. Then, the first half flange 7 and the second half flange 8 are installed by the fasteners 9, and the installation of the anti-disengagement structure is completed.

[0064] The deflection angle is the angle of relative deflection of two adjacent pipes. When the deflection angle of two adjacent pipes is the maximum, the first half flange 7 and the second half flange 8 of the anti-disengagement structure after deflection both contact the pipe body 3, and the spigot 1 contacts the socket 2 at the inner wall corresponding to the third avoiding groove 26. Specifically, in the cross section shown in the figure, when the pipe where the spigot 1 is located is deflected clockwise to the maximum deflection angle a relative to the pipe where the socket 2 is located, as shown in the figure, the end of the inner wall of the second half flange 8 away from the first half flange 7 after deflection contacts the pipe body 3, and the contact point is O1, the end of the inner wall of the first half flange 7 close to the second half flange 8 after deflection contacts the pipe body 3, and the contact point is O2, and the contact point of the inner wall of the second half flange 8 and the first half flange 7 after deflection is O3. Obviously, the points O1, O2 and O3 are located at the three vertices of a right triangle respectively, and Figure 4 Figure 5 wherein, L 23 is the distance between the points O2 and O3, L 13 ​​The distance between point O1 and point O3 (i.e. the thickness of the second half flange 8, which is the dimension of the second half flange 8 in the axial direction of the pipe). The socket 1 contacts the inner wall of the spigot 2 at the minimum inner diameter of the third relief groove 26.

[0065] For the convenience of description, it is assumed that the central axes of the two adjacent pipes coincide before deflection, and the first half flange 7, the retainer ring 5 and the protruding member 4 are in contact in turn; after deflection, the central axes of the two adjacent pipes intersect, as shown in Figure 4 In order to make the maximum deflection angle of the two adjacent pipes reach α, the size B of the second relief groove 22 in the axial direction of the pipe, the half difference H between the inner diameter of the spigot 2 at the second relief groove 22 and the outer diameter of the socket 1, the inner diameter d1 of the spigot 2 at the blocking portion 23, and the half difference h1 between the outer diameter and the inner diameter of the retainer ring 5 should satisfy the following requirements: (1) (2) (3) (4) Wherein, as shown in Figure 6 B0 is the maximum axial distance from the proximal end of the retainer ring 5 of the protruding member 4 before deflection to the distal end of the retainer ring 5 of the protruding member 4 after deflection, the axial direction refers to the axial direction of the protruding member 4 before deflection. H0 is the maximum radial distance between the outer wall of the socket 1 before deflection and the outer wall of the protruding member 4 after deflection, the radial direction refers to the radial direction of the protruding member 4 or the socket 1 before deflection. D1 is the outer diameter of the socket 1, D0 is the maximum value of the difference between the radial distance of the proximal end of the protruding member 4 of the inner wall of the blocking portion 23 of the spigot 2 before deflection and the outer wall of the socket 1 and the radial distance of the distal end of the protruding member 4 after deflection and the outer wall of the socket 1. h0 is the maximum radial distance between the inner wall of the second relief groove 22 of the spigot 2 and the inner wall of the retainer ring 5 after deflection, the radial direction refers to the radial direction of the socket 1 before deflection.

[0066] As shown in Figure 6 The above inequality (1) shows that the size of the second relief groove 22 in the axial direction of the pipe is sufficient to meet the displacement of the protruding member 4 in the axial direction of the spigot 2. The above inequality (2) shows that the distance between the inner wall of the spigot 2 at the second relief groove 22 and the outer wall of the socket 1 is sufficient to meet the displacement of the protruding member 4 in the radial direction of the spigot 2. The above inequality (3) shows that the inner diameter of the spigot 2 at the blocking portion 23 is sufficient to meet the radial displacement of the socket 1. The above inequality (4) shows that the half difference h1 between the outer diameter and the inner diameter of the retainer ring 5 meets the deflection requirement so that the retainer ring 5 will not be pulled out from the connection between the first relief groove 21 and the second relief groove 22 after deflection.

[0067] Based on the above inequalities (1)-(4) and the geometric relationship before and after the deflection of the pipe, it is obtained that: (5) (6) (7) (8) wherein b is the width of the protruding member 4, i.e. the dimension of the protruding member 4 in the direction parallel to the central axis of the pipe, D2 is the outer diameter of the pipe body 3, h is half of the difference between the outer diameter and the inner diameter of the protruding member 4, t2 is the axial distance (parallel to the central axis of the pipe) between the connection of the sealing groove 24 and the third relief groove 26 and the bottom of the fastening hole 25, L1 is the length of the fastening hole 25, i.e. the dimension of the fastening hole 25 in the direction parallel to the central axis of the pipe, d2 is the minimum inner diameter of the socket 2 at the third relief groove 26, B1 is the dimension of the first relief groove 21 in the direction parallel to the central axis of the pipe, .

[0068] It should be noted that the above relationships do not limit the specific values of the parameters, and the specific values of the parameters can be selected and calculated according to the use occasion, but need to meet the above relationships. For example, the outer diameter of the spigot 1 and the outer diameter of the pipe body 3 are selected according to the use requirements, and the width b of the protruding member 4 is calculated by allowing the pulling force and the allowable stress of the pipe.

[0069] Example Two: Different from Example One, in this example, the outer diameter of the spigot 1 is equal to the outer diameter of the pipe body 3, the inner diameter of the spigot 1 is equal to the inner diameter of the pipe body 3, the protruding member 4 is fixedly sleeved outside the pipe body 3 or the spigot 1, and only the inner wall of the protruding member 4 contacts the outer wall of the pipe body 3 or the spigot 1. This example does not have a spigot reinforcing ring 12. As shown in Figure 9 .

[0070] Similar to Example One, in this example, when the deflection angle of two adjacent pipes is the maximum, the first half flange piece 7 and the second half flange piece 8 of the anti-disengagement interface after deflection both contact the pipe body 3, and the spigot 1 contacts the inner wall of the socket 2 corresponding to the third relief groove 26. Specifically, in the cross-section shown in Figure 10 , when the pipe where the spigot 1 is located is deflected clockwise to the maximum deflection angle a relative to the pipe where the socket 2 is located, as shown in Figure 11As shown, the end of the inner wall of the second half flange 8 away from the first half flange 7 after deflection contacts the pipe body 3, the contact point being O1, the end of the inner wall of the first half flange 7 close to the second half flange 8 after deflection contacts the pipe body 3, the contact point being O2, and the contact point between the inner wall of the second half flange 8 and the first half flange 7 after deflection being O3. Obviously, the points O1, O2 and O3 are located at the three vertices of a right triangle, respectively, and wherein, L 23 is the distance between the points O2 and O3, L 13 is the distance between the points O1 and O3 (i.e. the thickness of the second half flange 8, which is the dimension of the second half flange 8 parallel to the axial direction of the pipe). The socket 1 contacts the inner wall of the socket 2 at the position corresponding to the minimum inner diameter of the third relief groove 26.

[0071] For the convenience of description, it is assumed that the central axes of the two adjacent pipes coincide before deflection, and the first half flange 7, the retainer ring 5 and the protruding member 4 contact each other in sequence; and the central axes of the two adjacent pipes intersect after deflection, as shown in Figure 10 In order to enable the maximum deflection angle of the two adjacent pipes to reach α, the dimension B of the second relief groove 22 in the direction parallel to the central axis of the pipe, the dimension H2 of the second relief groove 22 in the direction parallel to the radial direction of the pipe (i.e. half of the difference between the inner diameter of the socket 2 at the second relief groove 22 and the inner diameter of the socket 2 at the blocking portion 23), the thickness h1 of the retainer ring 5 (i.e. half of the difference between the outer diameter and the inner diameter of the retainer ring 5), and the distance H1 between the first relief groove 21 and the socket 1 (i.e. half of the difference between the inner diameter of the socket 2 at the first relief groove 21 and the outer diameter of the socket 1) satisfy the following conditions: (9) (10) (11) (12) wherein, as shown in Figure 12 and 13 B0 is the maximum axial distance from the end of the protruding member 4 close to the retainer ring 5 before deflection to the end of the protruding member 4 away from the retainer ring 5 after deflection, the axial direction being the axial direction of the protruding member 4 before deflection. H0 is the maximum radial distance between the outer wall of the socket 1 before deflection and the outer wall of the protruding member 4 after deflection, the radial direction being the radial direction of the protruding member 4 or the socket 1 before deflection. d1 is the inner diameter of the socket 2 at the blocking portion 23. D1 is the outer diameter of the socket 1. h0 is the maximum radial distance between the inner wall of the socket 2 at the second relief groove 22 and the inner wall of the retainer ring 5 after deflection, the radial direction being the radial direction of the protruding member 4 or the socket 1 before deflection. h7 is the natural thickness of the elastic member 6, i.e. half of the difference between the outer diameter and the inner diameter of the elastic member 6 in the natural state without external force.

[0072] The inequality (9) shows that the size of the second relief groove 22 in the direction parallel to the axial direction of the pipe is sufficient to meet the displacement of the protruding part 4 in the axial direction of the socket 2. The inequality (10) shows that the size of the second relief groove 22 in the direction parallel to the radial direction of the pipe (half of the difference between the inner diameter of the socket 2 at the second relief groove 22 and the inner diameter of the socket 2 at the blocking part 23) is sufficient to meet the displacement of the protruding part 4 in the radial direction of the socket 2. The inequality (11) shows that the thickness of the retainer ring 5 (half of the difference between the outer diameter and the inner diameter of the retainer ring 5) meets the deflection requirement so that the retainer ring 5 will not come out of the connection between the first relief groove 21 and the second relief groove 22 after being deflected. The inequality (12) shows that the distance between the inner wall of the first relief groove 21 and the outer wall of the spigot 1 (half of the difference between the inner diameter of the socket 2 at the first relief groove 21 and the outer diameter of the spigot 1) is not less than the sum of the thickness of the retainer ring 5 and the natural thickness of the elastic part 6, which ensures that the elastic part 6 has sufficient compression space when deflected.

[0073] Based on the above inequalities (9) to (12) and the geometric relationship before and after the pipe is deflected, the following is obtained: (13) (14) (15) (16) In the above, the meanings of the symbols are as follows: h is half of the difference between the outer diameter and the inner diameter of the protruding part 4, b is the width of the protruding part 4, i.e. the size of the protruding part 4 in the direction parallel to the central axis of the pipe; t2 is the axial (parallel to the central axis of the pipe) distance between the connection of the sealing groove 24 and the third relief groove 26 and the bottom of the fastening hole 25; L1 is the length of the fastening hole 25, i.e. the size of the fastening hole 25 in the direction parallel to the central axis of the pipe; b1 is the size of the retainer ring 5 in the direction parallel to the central axis of the retainer ring 5, b1 > b; d2 is the minimum inner diameter of the socket 2 at the third relief groove 26.

[0074] Finally, it is necessary to point out that the above examples are only used to further illustrate the technical solutions of the present application and cannot be understood as limiting the protection scope of the present application. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present application all belong to the protection scope of the present application.

Claims

1. A structure for preventing a pipe from falling off when being dragged, comprising a spigot (1), a pipe body (3) and a socket (2), wherein the spigot (1) is coaxially connected to one end of the pipe body (3), and the spigot (1) is inserted into the socket (2), and is characterized in that: The outer diameter of the socket (1) is greater than or equal to the outer diameter of the pipe body (3); the inner wall of the socket (2) is provided with a first avoidance groove (21), a second avoidance groove (22), a blocking portion (23), a sealing groove (24) and a third avoidance groove (26) in sequence from the end face toward the direction away from the end face of the socket (2); the anti-slip structure further comprises a protrusion (4), a stop ring (5), an elastic member (6), and at least two arc-shaped first half flanges (7); the annular protrusion (4) is fixedly mounted on the outer surface of the pipe body (3); when the outer diameter of the socket (1) is greater than the outer diameter of the pipe body (3), one end face of the protrusion (4) contacts the step surface of the socket (1); the step surface is a plane parallel to the radial direction of the socket (1) formed by the socket (1) protruding from the outer surface of the pipe body (3); the annular stop ring (5) is movably sleeved on the pipe body (3), the end face area of ​​the retaining ring (5) is larger than the end face area of ​​the protruding piece (4), the first half flange (7) covers the end face of the socket (2) and exceeds the inner wall of the end face of the socket (2) in the radial direction of the socket (2), so that the first half flange (7), the retaining ring (5), and the protruding piece (4) contact each other in sequence to transmit the axial thrust for pulling the adjacent pipes together, the retaining ring (5) is limited in the first avoidance groove (21), the elastic member (6) is pressed between the inner wall of the socket (2) and the retaining ring (5), the protruding piece (4) is limited between the retaining ring (5) and the blocking portion (23), and when the socket (1) and the socket (2) are coaxial, the first half flange (7) does not contact the pipe body (3), and the inner wall of the socket (2) does not contact the pipe body (3) so that the socket (1) and the socket (2) can be relatively deflected; The first half flange (7) is fixed to the socket (2) by a fastener (9), and the socket (2) is provided with a fastening hole (25) which is a blind hole for inserting the fastener (9), and the fastening hole (25) is formed by being concave from the end surface of the socket (2); When two adjacent pipes can be relatively deflected and the maximum deflection angle is α, when the outer diameter of the socket (1) is larger than the outer diameter of the pipe body (3), the dimension B of the second avoidance groove (22) parallel to the axial direction of the pipe, half the difference H between the inner diameter of the socket (2) at the second avoidance groove (22) and the outer diameter of the socket (1), the inner diameter d1 of the socket (2) at the blocking portion (23), and half the difference h1 between the outer diameter and the inner diameter of the stop ring (5) should meet the following requirements: ； ； ； ； Wherein, b is the dimension of the protrusion (4) in a direction parallel to its central axis, D2 is the outer diameter of the pipe body (3), h is half the difference between the outer diameter and the inner diameter of the protrusion (4), D1 is the outer diameter of the socket (1), t2 is the axial distance between the connection of the sealing groove (24) and the third avoidance groove (26) and the bottom of the fastening hole (25), L1 is the length of the fastening hole (25), b1 is the dimension of the stop ring (5) in a direction parallel to its central axis, d2 is the minimum inner diameter of the socket (2) in the third avoidance groove (26), and B1 is the dimension of the first avoidance groove (21) in a direction parallel to the axial direction of the pipe.

2. The anti-slip structure according to claim 1, characterized in that: Each first half flange (7) is spliced ​​into an annular structure, the inner diameter of which is larger than the outer diameter of the pipe body (3), and the anti-slip structure further comprises at least two arc-shaped second half flanges (8), the inner diameter of the annular structure where the second half flanges (8) are located is larger than the outer diameter of the pipe body (3), and each second half flange (8) covers each splicing gap respectively, and the splicing gap is the splicing position of two adjacent first half flanges (7).

3. The anti-slip structure according to claim 2, characterized in that: The inner diameter of the socket (2) at the first avoidance groove (21), the outer diameter of the stop ring (5), the inner diameter of the socket (2) at the second avoidance groove (22), the outer diameter of the protrusion (4), the inner diameter of the socket (2) at the blocking portion (23), and the outer diameter of the socket (1) decrease in sequence.

4. The anti-slip structure according to claim 3, characterized in that: The width of the retaining ring (5) is not greater than the width of the first avoidance groove (21), the width of the protrusion (4) is less than the width of the second avoidance groove (22), the width of the retaining ring (5) refers to the axial dimension of the retaining ring (5), the width of the protrusion (4) refers to the axial dimension of the protrusion (4), the width of the first avoidance groove (21) refers to the dimension of the first avoidance groove (21) in the axial direction of the socket (2), and the width of the second avoidance groove (22) refers to the dimension of the second avoidance groove (22) in the axial direction of the socket (2).

5. The anti-slip structure according to any one of claims 2 to 4, characterized in that: The first half flange (7) and the second half flange (8) do not extend beyond the outer wall surface of the socket (2) in the radial direction of the socket (2).

6. The anti-slip structure according to any one of claims 2 to 4, characterized in that: A plurality of fasteners (9) are provided. In the portion where the first half flange (7) and the second half flange (8) are stacked, the fasteners (9) sequentially pass through the second half flange (8) and the first half flange (7) and then are inserted into the socket (2) from the end face of the socket (2). In the portion not covered by the second half flange (8), the fasteners (9) pass through the first half flange (7) and then are inserted into the socket (2) from the end face of the socket (2).

7. The anti-slip structure according to claim 1, characterized in that: The first avoidance groove (21), the second avoidance groove (22), the blocking portion (23), the sealing groove (24) and the third avoidance groove (26) are arranged in sequence along the axial direction of the bell mouth (2); the inner diameter of the bell mouth (2) at the sealing groove (24), the inner diameter at the third avoidance groove (26) and the inner diameter of the pipe body (3) decrease in sequence; the inner diameter of the bell mouth (2) at the third avoidance groove (26) is not less than the inner diameter of the bell mouth (2) at the blocking portion (23).

8. The anti-slip structure according to claim 7, characterized in that: When two adjacent pipes can be relatively deflected and the maximum deflection angle is α, when the outer diameter of the socket (1) is equal to the outer diameter of the pipe body (3), the dimension B of the second avoidance groove (22) in the direction parallel to the central axis of the pipe, half H2 of the difference between the inner diameter of the socket (2) at the second avoidance groove (22) and the inner diameter at the blocking portion (23), half h1 of the difference between the outer diameter and the inner diameter of the stop ring (5), and half H1 of the difference between the inner diameter of the socket (2) at the first avoidance groove (21) and the outer diameter of the socket (1) meet the following conditions: ； ； ； ； Wherein, B0 is the maximum axial distance between one end of the protrusion (4) before deflection and the end of the protrusion (4) away from the stop ring (5), and the axial direction refers to the axial direction of the protrusion (4) before deflection; H0 is the maximum radial distance between the outer wall of the socket (1) before deflection and the outer wall of the protrusion (4) after deflection; the radial direction refers to the radial direction of the protrusion (4) or the socket (1) before deflection; d1 is the inner diameter of the socket (2) at the blocking portion (23); D1 is the outer diameter of the socket (1); h0 is the maximum radial distance between the inner wall of the socket (2) in the second avoidance groove (22) and the inner wall of the stop ring (5) after deflection; the radial direction refers to the protrusion (4) before deflection; h7 is the natural thickness of the elastic member (6), that is, half of the difference between the outer diameter and the inner diameter of the elastic member (6) in the natural state without external force.

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