Pipe fitting anchoring assembly and spheroidal graphite cast pipe applying same

Abstract

The pipe fitting anchoring assembly comprises a plurality of arc-shaped blocks, connecting parts arranged at the two ends of the arc-shaped blocks in the arc-shaped length direction and connecting structures for connecting every two adjacent connecting parts, the sum of the central angles of the arc-shaped blocks is smaller than 360 degrees, and the circle centers of the inner arcs and the outer arcs of the arc-shaped blocks coincide. The width of the connecting part in the axis direction is larger than that of the arc-shaped blocks, and the connecting structure is arranged to be capable of adjusting the arc-shaped blocks to be close to or away from the circle center. An annular anchoring bin is arranged on the inner circumference of the pipe socket, a blocking shoulder is arranged between the rear side of the anchoring bin and the rear end of the pipe socket, the front side face of the blocking shoulder and the rear side face of each arc-shaped block are matched arc-shaped faces, and the maximum outer diameter of each arc-shaped block is smaller than the maximum inner diameter of the anchoring bin and larger than the minimum inner diameter of the blocking shoulder. And a plurality of adjusting notches capable of accommodating the corresponding connecting parts to extend out are further formed in the retaining shoulder in one-to-one correspondence to the connecting parts of the arc-shaped blocks.

Description

Technical Field

[0001] This utility model relates to the field of pipe fitting connection technology, specifically to a pipe fitting anchoring component and a ductile iron pipe using the same. Background Technology

[0002] As a core component of urban water supply network systems, the reliability of ductile iron pipe interfaces directly affects the operational safety of the network. Currently, adjacent pipes are mainly connected through a socket-type structure, which involves setting a flexible rubber ring in the annular space formed by the spigot and socket ends. However, the flexible interface is a weak point in the operation of the network. Relying solely on the compression of the rubber ring to prevent detachment is far from meeting the requirements, especially when the foundation is settling and concrete supports cannot be installed, or when it is used in large-diameter water pipelines. In such cases, the interface cannot withstand large tensile forces and deflection angles simultaneously. Utility Model Content

[0003] To address the technical problems existing in the background art, this utility model provides a pipe anchoring assembly and a ductile iron pipe using the same.

[0004] The technical solution of this utility model is as follows:

[0005] A ductile iron pipe includes a pipe socket and a spigot inserted thereon, and a pipe fitting anchoring assembly disposed between the pipe socket and the spigot, wherein the anchoring assembly is used to provide pull-out resistance for the connection of the two pipes and to maintain effective anchoring while withstanding radial deflection force.

[0006] The core inventive point of this utility model is:

[0007] The anchoring assembly includes multiple arc-shaped blocks, connecting parts located at both ends of the arc length of the arc-shaped blocks, and a connecting structure connecting adjacent connecting parts. The sum of the central angles of the multiple arc-shaped blocks is less than 360°, the centers of the inner and outer arcs of each arc-shaped block coincide, the width of the connecting part in the axial direction is greater than the width of the arc-shaped block, and the connecting structure is configured to adjust the radial contraction / expansion of each arc-shaped block.

[0008] The inner circumference of the pipe socket is provided with an annular anchoring chamber. The rear side of the anchoring chamber is connected to the rear end of the pipe socket by a shoulder. The front side of the shoulder and the rear side of each arc block are matching arc surfaces. The maximum outer diameter of each arc block is smaller than the maximum inner diameter of the anchoring chamber and larger than the minimum inner diameter of the shoulder. The shoulder is also provided with multiple adjustment notches that can accommodate the extension of the corresponding connection parts of the multiple arc blocks.

[0009] In use, the anchoring component of this utility model adjusts the radial contraction of each arc-shaped block by adjusting the connection structure, so that the axial end of the arc-shaped block near the connection part abuts against the front arc-shaped surface of the pipe socket shoulder. At the same time, the inner arc surface of the arc-shaped block hugs the outer wall of the pipe socket to form multi-point anchoring. When the pipeline is subjected to axial tensile force, the contact area between the anchoring component and the front arc-shaped surface of the shoulder generates a self-locking effect, enhancing the pull-out resistance. When the pipeline system deflects, the sliding contact between the front arc-shaped surface of the shoulder and the arc-shaped block can adaptively adjust the contact angle to maintain a uniform distribution of anchoring force, so that the pipeline system can maintain effective anchoring while bearing radial deflection force. Thus, under the condition of installation without concrete support, it can achieve the coordinated bearing of large-specification pipeline systems for axial tensile loads and large-angle deflection (up to 8° or more), and is particularly suitable for the construction of long-distance water transmission pipelines in areas of geological subsidence.

[0010] To further improve the anchoring strength of the two pipelines:

[0011] The connecting part is a block-shaped structure that extends along the axial side of the arc-shaped block, and its inner surface is the same arc-shaped surface as the inner surface of the arc-shaped block. In use, the inner arc surfaces of the arc-shaped block and the connecting part simultaneously grip the pipe socket to form a continuous anchoring surface.

[0012] As one implementation method, the connection structure includes a screw and a locking nut screwed thereon. The screw passes through the side away from the arc-shaped block of the two adjacent connection parts, and a locking nut is provided on the screw on both sides of the two connection parts. In use, the radial contraction of each arc-shaped block to tighten the tube socket / expansion to loosen the tube socket is adjusted by turning the locking nuts at each position.

[0013] Furthermore, the connection structure has at least two sets, and the two sets of connection structures are arranged at intervals along the axial direction of the arc-shaped block.

[0014] Furthermore, the inner wall radii of curvature of each arc-shaped block are equal.

[0015] Preferably, for larger pipe diameters (e.g., DN≥1200), the sum of the central angles of each arc block is 340°-355°, so as to ensure sufficient adjustment space while maximizing the preservation of the arc length of the arc block, thereby maintaining high anchoring strength.

[0016] To facilitate the assembly and positioning of each arc block, a limiting part is provided on the outer side of the connecting part away from the arc block, and the vertical distance from the outer side of the limiting part to the outer wall of the pipe socket is greater than the difference between the maximum inner radius of the shoulder and the outer radius of the pipe socket.

[0017] Preferably, at least four arc-shaped blocks are provided, and the arc-shaped blocks and connecting parts are integrally manufactured and made of the same material as the pipe. Furthermore, to facilitate the processing of the arc-shaped blocks and improve interchangeability, the specifications of each arc-shaped block and each connecting part are identical.

[0018] This invention, through the design of the anchoring components and the corresponding pipe sockets and spigots, enables the pipeline system to maintain effective anchoring while bearing radial deflection forces. Thus, under the condition of installation without concrete supports, it enables large-scale pipeline systems to coordinate the bearing of axial tensile loads and large-angle deflections, and is particularly suitable for the construction of long-distance water transmission pipelines in areas of geological subsidence. Attached Figure Description

[0019] In the attached diagram:

[0020] Figure 1 This is a structural schematic diagram of a pipe anchoring assembly according to the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of AA section;

[0022] Figure 3 This is a schematic diagram illustrating the use of the connection structure in this embodiment;

[0023] Figure 4 This is a schematic diagram of the structure of a ductile iron pipe according to this embodiment;

[0024] Figure 5 for Figure 4 A schematic diagram of the B-direction structure of the adjustment gap in the middle;

[0025] The components represented by the various reference numerals in the diagram are:

[0026] 1. Pipe socket; 11. Shoulder; 12. Adjustment notch; 13. Stop shoulder; 2. Pipe spigot; 3. Anchoring assembly; 31. Arc block; 32. Connecting part; 33. Limiting part; 34. Screw; 35. Locking nut; 4. Sealing ring; 5. Stop ring. Detailed Implementation

[0027] Combination Figure 4 This embodiment provides a pipe anchoring component 3 and a ductile iron pipe using it, including a pipe socket 1 and a pipe spigot 2 inserted on its rear side, and an anchoring component 3 disposed between the pipe socket 1 and the pipe spigot 2. The anchoring component 3 is used to provide pull-out resistance for the connection of the two pipes and to maintain effective anchoring while withstanding radial deflection force.

[0028] Combination Figure 1 The anchoring component 3 includes multiple arc-shaped blocks 31, connecting parts 32 located at both ends of the arc length of the arc-shaped blocks 31, and a connecting structure connecting two adjacent connecting parts 32.

[0029] The sum of the central angles of the multiple arc blocks 31 is less than 360°, the centers of the inner and outer arcs of each arc block 31 coincide, the width of the connecting part 32 in the axial direction is greater than the width of the arc block 31, and the connecting structure is configured to adjust the radial contraction / expansion of each arc block 31.

[0030] Combination Figure 4 The inner circumference of the pipe socket 1 is provided with an annular sealing chamber and an anchoring chamber at intervals. A sealing ring 4 is installed in the sealing chamber. A stop shoulder 13 is between the sealing chamber and the anchoring chamber. The rear end of the pipe socket 1 is usually flat. The axial distance between the outer diameter of the stop shoulder 13 and the rear end of the pipe socket 1 is greater than the axial distance between the inner diameter of the stop shoulder 13 and the rear end of the pipe socket 1, forming a gradually expanding spatial layout. This provides axial expansion margin for the elastic recovery of the sealing ring 4 after compression deformation, avoids permanent deformation or stress relaxation of the sealing ring 4 due to excessive compression, and ensures the reliability of the sealing interface in long-term service.

[0031] Combination Figure 4 and Figure 5 The rear side of the anchoring chamber and the rear end of the pipe socket 1 are connected by a shoulder 11. The front side of the shoulder 11 and the rear side of each arc block 31 are arc surfaces that match each other. The maximum outer diameter of each arc block 31 is smaller than the maximum inner diameter of the anchoring chamber and larger than the minimum inner diameter of the shoulder 11. The shoulder 11 is also provided with multiple adjustment notches 12 that can accommodate the extension of the corresponding connection parts 32 of the multiple arc blocks 31.

[0032] In use, the above-mentioned anchoring component 3 adjusts the radial contraction of each arc block 31 by adjusting the connection structure, so that the axial end of the arc block 31 near the connection part 32 abuts against the front arc surface of the shoulder 11 of the pipe socket 1. At the same time, the inner arc surface of the arc block 31 hugs the outer wall of the pipe socket 2 to form multi-point anchoring. When the pipe is subjected to axial tension, the contact area between the anchoring component 3 and the front arc surface of the shoulder 11 generates a self-locking effect, which enhances the pull-out resistance.

[0033] When the pipeline system deflects, the sliding contact between the front arc-shaped surface of the shoulder 11 and the arc-shaped block 31 can adaptively adjust the contact angle to maintain a uniform distribution of anchoring force. This allows the pipeline system to maintain effective anchoring while bearing radial deflection force, thus enabling large-scale pipeline systems to withstand axial tensile loads and large-angle deflections (up to 8° or more) under the condition of installation without concrete supports. It is particularly suitable for the construction of long-distance water transmission pipelines in areas of geological subsidence.

[0034] Based on the above design, for larger pipe diameters (e.g., DN≥1200), the sum of the central angles of each arc block 31 is 340°-355°, so as to ensure sufficient adjustment space while maximizing the preservation of the arc length of the arc block 31, thereby maintaining high anchoring strength.

[0035] The inner wall curvature radius of each arc-shaped block 31 is equal. At least four arc-shaped blocks 31 are provided. The arc-shaped blocks 31 and the connecting parts 32 are integrally manufactured. To facilitate the processing of the arc-shaped blocks 31 and improve interchangeability, the specifications of each arc-shaped block 31 are the same, and the specifications of each connecting part 32 are the same.

[0036] Combination Figure 1 In this embodiment, the arc-shaped block 31 has four identical blocks, and the arc-shaped block 31 and the connecting part 32 are integrally manufactured and made of the same material as the pipe material.

[0037] Combination Figure 2 and Figure 5 Specifically, the connecting part 32 is a block-shaped structure extending along the axial side end of the arc-shaped block 31, and its inner surface is the same arc-shaped surface as the inner surface of the arc-shaped block 31. In use, the inner arc surfaces of the arc-shaped block 31 and the connecting part 32 simultaneously grip the pipe socket 2 to form a continuous anchoring surface. This design makes the thickness of the connecting part 32 equal to the thickness of the arc-shaped block 31 in the radial direction. Compared with the protrusion of the outer diameter surface of the arc-shaped block 31, it reduces the opening depth of the adjustment notch 12 and correspondingly enhances the strength of the pipe socket 1.

[0038] Combination Figure 4 To facilitate the assembly and positioning of the arc-shaped block 31, a limiting part 33 is provided on the outer side of the connecting part 32 away from the arc-shaped block 31, and the vertical distance from the outer side of the limiting part 33 to the outer wall of the pipe socket 2 is greater than the difference between the maximum inner radius of the shoulder 11 and the outer radius of the pipe socket 2.

[0039] Combination Figure 3 Specifically, the connection structure includes a screw 34 and a locking nut 35 screwed thereon. The screw 34 passes through the side of the two adjacent connecting parts 32 away from the arc-shaped block 31, and a locking nut 35 is provided on the screw 34 on both sides of the two connecting parts 32. In use, the radial contraction of each arc-shaped block 31 is adjusted by turning the locking nut 35 at each position to tighten the tube socket 2 / expand and loosen the tube socket 2.

[0040] In addition, when applied to large-scale pipe networks, the pipe socket 2 may be deformed during processing, such as becoming an elliptical pipe socket 2. In this case, one or more of the arc-shaped blocks 31 can be adjusted to make each arc-shaped block 31 hold the pipe socket 2 tightly.

[0041] Combination Figure 3 The connection structure has at least two sets, and the two sets of connection structures are arranged at intervals along the axial direction of the arc block 31.

[0042] Combination Figure 4The outer ring of the pipe socket 2 is also provided with a stop ring 5, the outer diameter of which is not greater than the minimum inner diameter of the shoulder 11. When in use, first place the sealing ring 4 in the sealing chamber; then install the four arc-shaped blocks 31 from the rear end of the pipe socket 1 in the anchoring chamber of the pipe socket 1 and away from the center. During the installation in the anchoring chamber, space needs to be reserved on the inner side of the arc-shaped blocks 31 for the stop ring 5 to pass through when the pipe socket 2 is inserted. During installation, the pre-installation position of the arc-shaped blocks 31 can be quickly found by inserting the outer side of the connecting part 32 into the inner wall of the anchoring chamber until the limiting part 33 abuts against the rear end of the pipe socket 1; then lock each arc-shaped block 31 through the connecting structure; then insert the pipe socket 2 into the pipe socket 1; finally, adjust the connecting structure so that the inner arc surface hugs the pipe socket 2 and the axial side end of the arc-shaped block 31 near the connecting part 32 abuts against the front arc-shaped surface of the shoulder 11 of the pipe socket 1.

Claims

1. A pipe anchoring assembly, characterized by, The arc-shaped blocks (31), the connecting portions (32) arranged at both ends of the arc-shaped length of the arc-shaped blocks (31), and the connecting structure connecting the adjacent two connecting portions (32); The sum of the central angles of the plurality of arc-shaped blocks (31) is less than 360°, and the centers of the inner and outer arcs of each arc-shaped block (31) coincide. The width of the connecting portion (32) in the axial direction is greater than the width of the arc-shaped block (31), and the connecting structure is arranged to be capable of adjusting the radial contraction / expansion of each arc-shaped block (31).

2. A pipe anchoring assembly as defined in claim 1, wherein, The connecting portion (32) is a block-shaped structure arranged along the axial side end of the arc-shaped block (31), and the inner side surface thereof is the same arc-shaped surface as the inner side surface of the arc-shaped block (31).

3. A pipe anchoring assembly as defined in claim 2, wherein, The connecting structure includes a screw rod (34) and a locking nut (35) arranged thereon in a spiral manner. The screw rod (34) passes through the side of the adjacent two connecting portions (32) away from the arc-shaped block (31), and the locking nut (35) is arranged on the screw rod (34) on both sides of the two connecting portions (32).

4. A pipe anchoring assembly as defined in claim 3, wherein, The connecting structure is arranged in at least two groups, and the two groups are arranged in the axial direction of the arc-shaped block (31).

5. A pipe anchoring assembly as defined in claim 1, wherein, The curvature radii of the inner walls of each arc-shaped block (31) are equal.

6. A pipe anchoring assembly as defined in claim 1, wherein, The sum of the central angles of each arc-shaped block (31) is 340°-355°.

7. A ductile iron pipe comprising a pipe socket (1) and a pipe spigot (2) inserted into the rear side thereof, wherein a pipe fitting anchoring assembly according to any one of claims 1-6 is arranged between the pipe socket (1) and the pipe spigot (2). characterized in that An annular anchoring chamber is arranged on the inner periphery of the pipe socket (1), and a shoulder (11) is arranged between the rear side of the anchoring chamber and the rear end of the pipe socket (1), and the front side surface of the shoulder (11) and the rear side surface of each arc-shaped block (31) are arc-shaped surfaces that match each other. The maximum outer diameter of each arc-shaped block (31) is less than the maximum inner diameter of the anchoring chamber and greater than the minimum inner diameter of the shoulder (11), and a plurality of adjustment notches (12) capable of accommodating the connecting portions (32) of the plurality of arc-shaped blocks (31) are arranged on the shoulder (11) in one-to-one correspondence with the connecting portions (32).

8. A ductile cast pipe according to claim 7, wherein A limiting portion (33) is further arranged on the outer side of the end of the connecting portion (32) away from the arc-shaped block (31), and the perpendicular distance from the outer side of the limiting portion (33) to the outer wall of the pipe spigot (2) is greater than the difference between the maximum inner radius of the shoulder (11) and the outer radius of the pipe spigot (2).

9. A ductile cast pipe according to claim 7, wherein The arc-shaped blocks (31) are arranged in at least four blocks.

10. A ductile cast pipe according to claim 7, wherein The arc-shaped blocks (31) and the connecting portions (32) are integrally formed, and the specifications of each arc-shaped block (31) and each connecting portion (32) are the same.

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