Self-anchored Joint Ductile Iron Pipe

The self-anchored joint ductile iron pipe adopts a specially engineered mechanical locking design that provides reliable anti-pull-out performance while maintaining joint flexibility and deflection capability. This allows the joint to replace restraining blocks and enables non-block installation, ideal for projects where space, time or economic conditions do not allow the construction of concrete thrust blocks.

It is suitable for conditions such as foundation settlement, above-ground pipeline slopes exceeding 20%, or underground slopes exceeding 25%.

Types of Self-anchored Joints

1. Mechanical Self-anchored Joint

A welded ring on the spigot end engages with the anchoring mechanism to ensure stable locking while retaining joint flexibility.

2. Ball-type Self-anchored Joint

A self-anchored chamber is added to the socket structure.
Anchoring is realized through pressure transfer between the self-anchored sphere and the spigot welding ring.
This type allows free disassembly, suitable for installations requiring maintenance or repeated assembly.

3. Support-anchor Type Joint

Anchoring is achieved through thrust transfer between the supporting anchor assembly and the spigot ring.
It offers reliable anti-shedding performance and good deflection capability.

4.External Self-anchored Joint

The axial stress at the spigot end is transmitted to the socket through the retaining ring, flange and bolts, forming a complete axial stress transmission path that provides strong anti-slip performance.