Restrained Joint Ductile Iron Pipe
Restrained Joint structure (also called self-anchored joint), adopts the T-joint sealing structure. Compared with T-joint, it adds a welded bead on spigot, an open-end locking ring, a special gland and connecting bolts to provide the joint with good anti-slippage performance. The locking ring and the gland can slide between each other, so that the joint has certain axial stretching and deflection capability.
In the following conditions, certain length of pipeline with retrained joints could be applied in order to prevent pipeline slippage:
1. Places such as bends, tees, reducers and plugs, etc;
2. When the pipeline laying slope exceeds 20% (laying overground) or 25% (laying underground);
3. When it is uneconomical (such as large-diameter high-pressure pipelines, etc.) or unable to set concrete buttress, for example: A. The construction site is too narrow; there is no space to set up specified concrete block; B. Construction schedule is tight;
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