GRP pipe joints can be generally classified into two:
1) Un-restrained Joint - This type of joint can with stand only hoop pressure. Concrete thrust blocks are required at directional changes to resist longitudinal forces.
eg: Rubber Ring Joint
2) Restrained Joint - It can accommodate both hoop pressure and longitudinal forces. So the necessity of concrete thrust blocks are eliminated.
eg: Tapered Glue Joint, Lock Joint, Flanged Joint & Lamination Joint
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