Socket-type pipe connection with anchor structure

Abstract

Disclosed is a socket-spigot pipeline interface having a fastening structure, relating to a socket-spigot interface having a fastening structure for connecting a spherical graphite cast iron pipe. The socket-spigot interface comprises a socket (67), a spigot (66), and a sealing member (65) between the socket (67) and spigot (66) for sealing and fastening the pipeline interface. The socket (67) comprises an annular recess (5) defined by the sequential connection between a first annular vertical wall (1), a conical wall (2), a cylindrical inner wall (3) and a second annular vertical wall (4). The sealing member (65) comprises an elastic material ring (69) and a plurality of fastening members (68) embedded therein. The fastening members (68) comprise head portions (51) and a plurality of meshing teeth (54). The fastening members (68) have centers of rotation (55). A portion at which the head portion (51) and the annular recess (5) mutually contact is an arc-shaped support surface (50). A region at which the arc-shaped support surface (50) and the annular recess (5) contact is disposed at a location at which the first annular vertical wall (1) and the conical wall (2) connect. The socket-spigot interface can improve fastening reliability, extend structure service life, decrease pipeline maintenance costs, and enable easy optimization simulation of an interface structure, increasing pipeline transport capability.

Description

technical field [0001] The invention relates to a socket-type pipe joint, in particular to a socket-type pipe joint with an anchoring structure for connecting ductile iron pipes. Background technique [0002] Ductile iron pipes are used in the field of water and gas transmission. The two ends of the ductile iron pipes are sockets and sockets respectively. The main connection method of two ductile iron pipes in the pipeline is: the socket of one pipe and the socket of the other pipe Plug-in butt, and install a sealing rubber ring between the socket and the socket. Ductile iron pipes are supported by soil or other supports during use. In areas with poor geological conditions or prone to earthquakes, the supporting soil or other supports are prone to displacement, which can easily lead to plug-in socket and socket parts. If the axial relative movement or tilting movement opposite to the installation direction is severe, the structure may lose its sealing effect and cause water...

AI Technical Summary

Problems solved by technology

In prior art 4, when the interface moves relatively, the other support point of the anchor is in contact with the wall of the socket pipe. When the interface deflects when the foundation subsides, the anchor cannot adapt to the deflection of the interface. When the deflection reaches a certain angle , will cause the fracture of the anchor teeth

[0008] (5) Prior art 5 discloses an anchoring seal with an anchoring function, the publication number is US6688652B2, see the attached Figure 1e , in prior art 5, when the anchor structure is stressed, the two support points are in contact with the wall of the socket, and the contact form is point-to-surface contact. When the internal pressure of the pipe wall increases, the anchor cannot Rotate, the teeth of the anchor will continue to penetrate into the pipe wall, resulting in the rupture of the pipe wall and water seepage at the interface.

[0010] (1) It is not conducive to improving the reliability of anchoring

In the process of changing the support position, the multi-point support of the anchors occurs. In this case, the pipe wall and the anchors are affected by the shear force, which may easily cause the pipe wall to crack or the anchor to break.

[0011] (2) It is not conducive to prolonging the life of the structure

Sealed pipes are prone to leaks due to broken anchors or partial material failure, resulting in the need for repair or replacement, resulting in increased maintenance costs

[0013] (4) Not conducive to structural optimization simulation

The change of the support position depends on the relative movement of the socket and the socket, and the relative movement of the two depends on the external environment such as the foundation. Therefore, the unpredictability of the external environment leads to the uncertainty of the support position, which in turn leads to the uncertainty of the pipe wall in the design stage. The numerical simulation is quite different from the real situation, which is not conducive to the design optimization of the overall structure of the socket-type pipe joint with anchoring structure, thus affecting the improvement of the overall performance and bringing inconvenience to the optimization design

[0014] (5) It is not conducive to increasing the pipeline transportation capacity

The size of the pipe diameter determines the transportation capacity of the pipeline structure. Due to the instability of the force caused by its multiple supports and the difficulty of simulation, etc., in order to ensure the reliability, stability, safety and life of the structure, the pipe diameter size It has been difficult to improve significantly. At present, the diameter of the socket-type pipe joint of the anchor structure in the market is only DN200 and below, which greatly limits the transportation capacity of the pipeline.

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