A detachment prevention connection structure for drag pipes

Abstract

This utility model discloses an anti-detachment connection structure for dragging pipes, including a spigot, a pipe body, a socket, at least two arc-shaped first half-flanges, and at least two arc-shaped second half-flanges. The spigot is inserted into the socket, and the outer diameter of the spigot is larger than the outer diameter of the pipe body. The first half-flanges are spliced ​​into a ring and cover the end face of the socket. The second half-flanges cover the splicing gaps, which are the joints between two adjacent first half-flanges. The first half-flanges extend beyond the inner wall of the socket to the part protruding from the pipe body and contacting the spigot, allowing thrust to be transmitted between the first half-flanges and the spigot. This thrust enables the sequential dragging of adjacent pipes. This utility model enables the sequential dragging of pipes, with the thrust directly transmitted to the spigot; it allows for deflection between adjacent pipes, requires simple components, is easy to install, has low overall cost, high interface strength, and requires low technical skills from installation equipment and personnel, making it suitable for on-site installation.

Description

Technical Field

[0001] This utility model belongs to the field of pipe technology, specifically a non-detachment connection structure for drag pipes. Background Technology

[0002] Pipe-pulling technology is a trenchless underground pipeline laying method. Its core process includes: drilling holes along a designed trajectory using a directional drill bit; progressively enlarging the hole diameter using a reamer; and finally, pulling the pipe back into the hole using the reamer's tail end. This process is repeated, with subsequent pipes being pulled into the hole by the preceding ones. If adjacent pipes detach during the pulling process, the pipes already pulled into the channel must be pulled out again, reconnected, and the pulling process restarted. This significantly reduces construction efficiency and increases costs. Therefore, it is crucial to ensure high strength, stability, and reliability at the connection points between adjacent pipes, as well as simple connections that facilitate on-site pipe connection. Utility Model Content

[0003] To address the aforementioned problems in existing technologies, the purpose of this utility model is to provide an anti-detachment connection structure for dragging pipes. This structure enables sequential dragging of pipes, with the thrust directly transmitted to the spigot. The spigot, as part of the main body of the pipe, has high strength, thereby improving the overall strength and reliability of the anti-detachment connection structure. The high overall strength of the second and first half flanges allows for deflection between adjacent pipes. The anti-detachment connection structure requires simple components, is easy to install, has low overall cost, and high interface strength, greatly reducing the probability of rework due to interface detachment during construction. It also has low requirements for installation equipment and personnel technical skills, making it suitable for on-site installation.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A non-detachment connection structure for dragging pipes includes a spigot, a pipe body, and a socket. The spigot is coaxially connected to one end of the pipe body and inserted into the socket. The outer diameter of the spigot is larger than the outer diameter of the pipe body. The non-detachment connection structure also includes at least two arc-shaped first half-flanges and at least two arc-shaped second half-flanges. Each first half-flange is spliced ​​into a ring and covers the end face of the socket. Each second half-flange covers a splicing gap. The splicing gap is the joint between two adjacent first half-flanges. The first half-flange extends beyond the inner wall of the socket to the part of the spigot that protrudes from the pipe body, allowing thrust to be transmitted between the first half-flange and the spigot. This thrust is axial and enables the sequential dragging of adjacent pipes.

[0006] As a further improvement to the above technical solution:

[0007] The first and second half flanges do not extend beyond the outer wall of the socket.

[0008] When the spigot and socket are coaxial, the first half flange and the second half flange do not contact the outer wall of the pipe body.

[0009] The anti-detachment connection structure also includes multiple fasteners, which fix the first half flange and the second half flange to the socket.

[0010] In the overlapping portion of the first and second half flange plates, the fastener passes through the second and first half flange plates in sequence and is then inserted into the socket from the socket end face. In the portion not covered by the second half flange plate, the fastener passes through the first half flange plate and is then inserted into the socket from the socket end face.

[0011] The socket is provided with a blind fastening hole for fasteners to be inserted, and the fastening hole is formed by recessing from the end face of the socket.

[0012] The anti-detachment connection structure also includes a sealing ring for achieving a seal, which is pressed between the socket and the inlet.

[0013] The socket is fitted with a socket reinforcement ring to enhance its strength.

[0014] The inner wall of the socket is also provided with a sealing groove and a transition groove. Both the sealing groove and the transition groove are grooves that run around the circumference of the inner wall of the socket. The transition groove is located between the sealing groove and the pipe body. The inner diameter of the socket at the sealing groove, the inner diameter of the socket at the transition groove, and the inner diameter of the pipe body decrease in sequence. The inner diameter of the socket at the transition groove is larger than the outer diameter of the spigot.

[0015] Two adjacent pipes can deflect relative to each other. When the maximum deflection angle is α, the following condition is satisfied: D2 < 2d2cosα - D1 - 2(2t2 + 2L1 + S1)sinα.

[0016] Where D2 is the outer diameter of the pipe body, d2 is the minimum inner diameter of the socket at the transition groove, D1 is the outer diameter of the spigot, t2 is the axial distance between the connection between the sealing groove and the transition groove and the bottom of the fastening hole, L1 is the length of the fastening hole, and S1 is the thickness of the first half flange, that is, the dimension of the first half flange in the direction parallel to the central axis of the pipe.

[0017] The beneficial effects of this utility model are:

[0018] (1) The step formed by the socket and the pipe body contacts and transmits force with the first half flange, realizing the sequential dragging of the pipe. The thrust of the first half flange is directly transmitted to the socket. As part of the main body of the pipe, the socket has high strength, thereby improving the overall strength and reliability of the anti-detachment connection structure.

[0019] (2) The second half flange and the first half flange are stacked and cover the gap between adjacent first half flanges, which greatly improves the overall strength of the second half flange and the first half flange.

[0020] (3) There are gaps between the second half flange and the first half flange and the coaxial pipe body, and there are gaps between the spigot and the socket outside the sealing ring. This allows the adjacent pipes to deflect, so that the pipes can deflect under external force during construction and use, thus improving the flexibility and applicability of the pipes.

[0021] (4) The second half flange and the first half flange do not extend beyond the outer wall of the socket and will not be subject to forward resistance during construction, thus minimizing the other external forces borne by the second half flange and the first half flange; the fasteners inserted into the blind holes in the socket will not be subject to the resistance of the pipe during construction because they pass through the socket.

[0022] (5) The anti-detachment connection structure requires simple components and is easy to install. The overall cost is low and the interface strength is high, which greatly reduces the probability of rework due to interface detachment during construction. It has low requirements for installation equipment and personnel technical level and is suitable for installation on construction site. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the pipe structure according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of an anti-detachment connection structure according to an embodiment of the present invention.

[0025] Figure 3 yes Figure 2 Another perspective structural diagram.

[0026] Figure 4 This is a schematic diagram of the anti-detachment connection structure of this utility model when the socket and the inlet are relatively deflected.

[0027] Figure 5 This is a schematic diagram of the socket end dimensions of one embodiment of the present invention.

[0028] Figure 6 yes Figure 4 Enlarged diagram of F1.

[0029] Figure 7 yes Figure 4 Enlarged diagram at F2.

[0030] Reference numerals: 1. Spigot, 2. Socket, 21. Sealing groove, 22. Fastening hole, 23. Transition groove, 3. Pipe body, 4. First half flange, 5. Second half flange, 6. Fastener, 7. Sealing ring, 8. Gasket, 9. Spigot reinforcing ring. Detailed Implementation

[0031] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0032] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0033] A type of anti-detachment connection structure for drag-and-pull pipes, such as Figure 1 As shown, the pipe is a socket-type pipe, including a spigot 1, a pipe body 3 and a socket 2 connected in sequence. The outer diameter of the spigot 1 is larger than the outer diameter of the pipe body 3, that is, the spigot 1 protrudes from the surface of the pipe body 3 to form a stepped structure.

[0034] When two adjacent pipes are connected, the spigot 1 of one pipe is inserted into the socket 2 of the other pipe, and with the cooperation of other auxiliary components, the anti-detachment connection structure is formed.

[0035] The anti-detachment connection structure is as follows: Figure 2 and 3 As shown, it includes a spigot 1, a pipe body 3, a socket 2, a first half flange 4, a second half flange 5, a fastener 6, a sealing ring 7, a gasket 8, and a spigot reinforcing ring 9.

[0036] The spigot 1 is coaxially connected to one end of the pipe body 3. The spigot 1 and the socket 2 of the anti-detachment connection structure are the spigot 1 and the socket 2 of two adjacent pipes, respectively, and the spigot 1 is inserted into the socket 2.

[0037] Both the first half-flange 4 and the second half-flange 5 are arc-shaped structures. There are at least two first half-flanges 4 and at least two second half-flanges 5. The first half-flanges 4 are joined together to form a ring that covers the end face of the socket 2. Each second half-flange 5 covers its respective joint, which is the junction of two adjacent first half-flanges 4. In other words, the second half-flange 5 does not need to cover the entire first half-flange 4, but only the joint between two adjacent first half-flanges 4. All the second half-flanges 5 are on the same ring.

[0038] The aforementioned arrangement of the first half flange 4 and the second half flange 5 improves the overall connection strength and reliability of the two, and minimizes the probability of the first half flange 4 and the second half flange 5 falling off and failing during construction.

[0039] Both the first half-flange 4 and the second half-flange 5 extend beyond the inner wall of the socket 2 end face until the first half-flange 4 contacts the spigot 1 inserted into the socket 2. That is, the inner diameter of the annulus formed by the splicing of the first half-flange 4 and the inner diameter of the annulus containing the second half-flange 5 are both smaller than the inner diameter at the end face of the socket 2 and the outer diameter of the spigot 1. Specifically, the side of the first half-flange 4 away from the second half-flange 5 contacts a side of the protruding pipe body 3 of the spigot 1. This side is parallel to the radial direction of the spigot 1, which is equivalent to the first half-flange 4 being blocked by the step formed by the protruding surface of the spigot 1 on the pipe body 3. This allows the first half-flange 4 and the spigot 1 to transmit thrust. This thrust is an axial thrust, realizing the sequential dragging of adjacent pipes in the axial direction.

[0040] Neither the first half flange 4 nor the second half flange 5 extends beyond the outer wall of the socket 2. That is, the outer diameter of the annulus formed by the splicing of the first half flanges 4, or the outer diameter of the annulus containing the second half flange 5, is less than or equal to the outer diameter at the end face of the socket 2. Thus, during construction, the first half flanges 4 and 5 will not be subject to resistance from the surrounding soil or other factors in the pipe's path, minimizing the external forces acting on them and improving their reliability.

[0041] When spigot 1 and socket 2 are coaxial, neither the first half-flange 4 nor the second half-flange 5 contacts the outer wall (outer surface) of the pipe body 3. In other words, the inner diameter of the annulus formed by the splicing of the first half-flanges 4 or the inner diameter of the annulus containing the second half-flange 5 is greater than the outer diameter of the pipe body 3. Furthermore, the minimum inner diameter of socket 2 is greater than the outer diameter of spigot 1. That is, when spigot 1 and socket 2 are coaxial, there are gaps between the first half-flanges 4 and second half-flanges 5 and the pipe body 3, and between spigot 1 and socket 2. These gaps allow for relative deflection between adjacent pipes to accommodate relative deflection caused by external forces during pipe construction or use. Figure 4The dashed line shows the position of the spigot 1 and the pipe body 3 after the pipe containing the spigot 1 is rotated clockwise relative to the pipe containing the socket 2. After the counterclockwise rotation, the position is symmetrical about the axis.

[0042] In this embodiment, each of the second half flanges 5 is located on the same ring. The outer diameter of the ring is equal to the outer diameter of the ring formed by splicing the first half flanges 4, and the inner diameter of the ring is greater than the inner diameter of the ring formed by splicing the first half flanges 4.

[0043] In this embodiment, there are two first half flange plates 4 and two second half flange plates 5.

[0044] Multiple fasteners 6 are provided, and the first half flange 4 and the second half flange 5 are fixed to the socket 2 by the fasteners 6. The multiple fasteners 6 are arranged at intervals on the same ring. In the part where the first half flange 4 and the second half flange 5 are stacked, the fasteners 6 pass through the second half flange 5 and the first half flange 4 in sequence and are inserted into the socket 2 from the end face of the socket 2. In the part not covered by the second half flange 5, the fasteners 6 pass through the first half flange 4 and are inserted into the socket 2 from the end face of the socket 2.

[0045] Furthermore, the socket 2 is provided with blind fastening holes 22 for inserting fasteners 6. The fastening holes 22 are recessed from the end face of the socket 2. One fastener 6 is inserted into each fastening hole 22. The fastener 6 does not protrude out of the socket 2 to avoid the fastener 6 being subjected to forward resistance during construction.

[0046] In this embodiment, the fastener 6 is a bolt, and a washer 8 is provided between the head of the fastener 6 and the first half flange 4 or between the second half flange 5.

[0047] In this embodiment, there are 12 fasteners 6.

[0048] The sealing ring 7 is pressed between the socket 1 and the receptacle 2 to achieve a seal between the socket 1 and the receptacle 2 of the anti-detachment connection structure. Correspondingly, the inner wall of the receptacle 2 is provided with a sealing groove 21 for installing the sealing ring 7.

[0049] A transition groove 23 is also provided on the inner wall of the socket 2. Both the sealing groove 21 and the transition groove 23 are equivalent to grooves set on the inner wall of the socket 2, and each groove is a groove that runs around the circumference of the inner wall of the socket 2. The transition groove 23 is located between the sealing groove 21 and the pipe body 3. The sealing groove 21, the transition groove 23 and the pipe body 3 form a stepped structure in sequence. The inner diameter of the socket 2 at the sealing groove 21, the inner diameter of the socket 2 at the transition groove 23, and the inner diameter of the pipe body 3 decrease in sequence. The inner diameter of the socket 2 at the transition groove 23 is larger than the outer diameter of the spigot 1. The inner diameter of the socket 2 at each point of the transition groove 23 may not be completely equal. Specifically, from the end face of the socket 2 toward the direction away from the end face of the socket 2, the inner diameter of the socket 2 at each point of the transition groove 23 gradually increases.

[0050] Furthermore, a reinforcing ring 9 is fitted inside the socket 1 to enhance its strength. The reinforcing ring 9 can be integrally formed with the socket 1, essentially making the socket 1 and the reinforcing ring 9 two separate metal layers of the same or different materials. Alternatively, the reinforcing ring 9 can be installed separately. When installed separately, the reinforcing ring 9 is annular, typically made of stainless steel, possessing a certain degree of ductility and rigidity. The initial outer diameter of the reinforcing ring 9 is smaller than the inner diameter of the socket 1. During installation, the reinforcing ring 9 is placed inside the socket 1, and then expanded using an expanding device until it is tightly pressed against the inner wall of the socket 1. The reason why the reinforcing ring 9 can be pressed tightly against the inner wall of the socket 1 is that during the expansion process, the inner wall of the socket 1 will be subjected to radial pressure from the expansion equipment. After the pressure is removed (the expansion is completed), the socket 1 and the reinforcing ring 9 will have a certain elastic recovery. Since the wall of the socket 1 is thick and connected to the pipe body, the elastic recovery is greater than that of the reinforcing ring 9. After the recovery, the reinforcing ring 9 is pressed tightly against the inner wall of the socket.

[0051] In this 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 from the pipe body 3 toward the socket 2.

[0052] When installing two adjacent pipes, first insert the sealing ring 7 into the sealing groove 21 of the socket 2 of the first pipe, then insert the spigot 1 of the second pipe into the socket 2 of the first pipe, with the connection between the spigot 1 and the pipe body 3 entering the socket 2. Then, install the first half flange 4 and the second half flange 5 together using fasteners 6 to complete the installation of the anti-detachment connection structure.

[0053] The deflection angle is the angle at which two adjacent pipes deflect relative to each other. When the deflection angle between the two adjacent pipes is at its maximum value, after deflection, both the first half-flange 4 and the second half-flange 5 of the connection structure contact the pipe body 3, and the spigot 1 contacts the socket 2 on the inner wall corresponding to the transition groove 23. Specifically, in Figure 4 In the cross-section shown, when the pipe containing spigot 1 is deflected clockwise relative to the pipe containing socket 2 to the maximum deflection angle α, as... Figure 6 As shown, after deflection, the end of the inner wall of the second half flange 5 furthest from the first half flange 4 contacts the pipe body 3 at point O1; the end of the inner wall of the first half flange 4 closest to the second half flange 5 contacts the pipe body 3 at point O2; and the contact point between the inner wall of the second half flange 5 and the first half flange 4 is point O3. Clearly, points O1, O2, and O3 are located at the three vertices of a right triangle, and... Among them, L 23 L is the distance between points O2 and O3. 13This is the distance between points O1 and O3 (i.e., the thickness of the second half flange 5, or the dimension parallel to the axial direction of the pipe). The spigot 1 contacts the inner wall of the socket 2 at the point where the inner diameter of the transition groove 23 is at its minimum.

[0054] For ease of explanation, assume that before deflection, the central axes of the two adjacent pipes coincide, and the stepped surfaces of the first half flange 4 and the spigot 1 are in contact; after deflection, the central axes of the two adjacent pipes intersect, as shown below. Figure 4 As shown. To ensure that the maximum deflection angle between two adjacent tubes reaches α, as... Figure 7 As shown, the spigot 1 will not be partially or completely dislodged from the socket 2 during the dragging process if half of the difference h between the outer diameter of the spigot 1 and the outer diameter of the pipe body 3 satisfies the following condition:

[0055] h>h0 (1)

[0056] Where h0 is the maximum vertical distance from the end of the inner wall of the first half flange 4 near the socket 1 to the deflected pipe body 3.

[0057] The above inequality (1) shows that the height h of the step protruding from the pipe body 3 of the spigot 1 meets the requirement that it will not detach from the first half flange 4.

[0058] Based on the above inequality (1) and the geometric relationship before and after pipe deflection, we obtain:

[0059] D2<2d2 cosα-D1-2(2t2+2L1+S1)sinα (2)

[0060] Wherein, D2 is the outer diameter of the pipe body 3, d2 is the minimum inner diameter of the socket 2 at the transition groove 23, D1 is the outer diameter of the spigot 1, t2 is the axial distance (parallel to the central axis of the pipe) between the connection of the sealing groove 21 and the transition groove 23 and the bottom of the fastening hole 22, L1 is the length of the fastening hole 22, that is, the dimension of the fastening hole 22 in the direction parallel to the central axis of the pipe, and S1 is the thickness of the first half flange 4, that is, the dimension of the first half flange 4 in the direction parallel to the central axis of the pipe.

[0061] It should be noted that the above formula does not limit the specific values ​​of each parameter. The specific values ​​of each parameter can be selected and calculated according to the application, but they must satisfy the above formula. For example, the outer diameter D1 of the socket 1 and the thickness S1 of the first half flange 4 are selected according to the required specifications based on the application requirements.

[0062] Finally, it is necessary to state that the above embodiments are only used to further illustrate the technical solution of this utility model in detail, and should not be construed as limiting the scope of protection of this utility model. Any non-essential improvements and adjustments made by those skilled in the art based on the above content of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A non-detachment connection structure for a drag pipe, 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), characterized in that, The outer diameter of the socket (1) is larger than the outer diameter of the pipe body (3). The anti-detachment connection structure also includes at least two arc-shaped first half flanges (4) and at least two arc-shaped second half flanges (5). Each first half flange (4) is spliced ​​into a ring and covers the end face of the socket (2). Each second half flange (5) covers each splicing gap. The splicing gap is the splicing point of two adjacent first half flanges (4). The first half flange (4) extends beyond the inner wall of the socket (2) to the part of the socket (1) that protrudes from the pipe body (3), so that the first half flange (4) and the socket (1) can transmit thrust. The thrust is an axial thrust, which realizes the sequential dragging of adjacent pipes.

2. The anti-detachment connection structure according to claim 1, characterized in that: The first half flange (4) and the second half flange (5) do not extend beyond the outer wall of the socket (2).

3. The anti-detachment connection structure according to claim 1, characterized in that: When the spigot (1) and the socket (2) are coaxial, the first half flange (4) and the second half flange (5) do not contact the outer wall of the pipe body (3).

4. The anti-detachment connection structure according to claim 1, characterized in that: The anti-detachment connection structure also includes multiple fasteners (6), which fix the first half flange (4) and the second half flange (5) onto the socket (2).

5. The anti-detachment connection structure according to claim 4, characterized in that: In the portion where the first half flange (4) and the second half flange (5) are stacked, the fastener (6) passes through the second half flange (5) and the first half flange (4) in sequence and is then inserted into the socket (2) from the end face of the socket (2). In the portion not covered by the second half flange (5), the fastener (6) passes through the first half flange (4) and is then inserted into the socket (2) from the end face of the socket (2).

6. The anti-detachment connection structure according to claim 4, characterized in that: The socket (2) is provided with a blind hole (22) for inserting fasteners (6), and the fastening hole (22) is formed by recessing from the end face of the socket (2).

7. The anti-detachment connection structure according to any one of claims 1 to 6, characterized in that: The anti-detachment connection structure also includes a sealing ring (7) for achieving a seal, which is pressed between the socket (1) and the receptacle (2).

8. The anti-detachment connection structure according to any one of claims 1 to 6, characterized in that: A socket reinforcement ring (9) is fitted inside the socket (1) to enhance the strength of the socket (1).

9. The anti-detachment connection structure according to claim 6, characterized in that: The inner wall of the socket (2) is also provided with a sealing groove (21) and a transition groove (23). Both the sealing groove (21) and the transition groove (23) are grooves that run around the inner wall of the socket (2) in a circumferential direction. The transition groove (23) is located between the sealing groove (21) and the pipe body (3). The inner diameter of the socket (2) at the sealing groove (21), the inner diameter of the socket (2) at the transition groove (23), and the inner diameter of the pipe body (3) decrease in sequence. The inner diameter of the socket (2) at the transition groove (23) is greater than the outer diameter of the spigot (1).

10. The anti-detachment connection structure according to claim 9, characterized in that: Two adjacent pipes can deflect relative to each other. When the maximum deflection angle is α, the following condition is satisfied: D2 < 2d2cosα - D1 - 2(2t2 + 2L1 + S1)sinα. Wherein, D2 is the outer diameter of the pipe body (3), d2 is the minimum inner diameter of the socket (2) at the transition groove (23), D1 is the outer diameter of the spigot (1), t2 is the axial distance between the connection between the sealing groove (21) and the transition groove (23) and the bottom of the fastening hole (22), L1 is the length of the fastening hole (22), and S1 is the thickness of the first half flange (4).

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