Commonly used joints in sewer pipes
The following types of sewer joints are generally found :-
1. Bell and Spigot Joints.
2. Collar Joints.
3. Flexible Joint.
4. Expansion Joint.
5. Flanged Joint.
Bell and Spigot joints: This joint is also termed as socket and spigot joint. This type of joint is mostly found in cast iron pipes containing different sizes and concrete pipes under 60 cm in diameter.
The pipes which should be attached with this joint are built up in such a manner that one end is expanded and the other end is normal. The expanded end is defined as socket or bell and the normal end is spigot. The spigot end is placed into the bell end and the void of the joint is stuffed with molten lead or bitumen or cement mortar.
Collar joints: In this type of joint, the ends of sewer are plain.
Prior to attach, the pipes are carried face to face at the equivalent level and a collar of marginally larger diameter is arranged over the joint. Then the annular gap among the pipes and the collar is stuffed with cement mortar (1:1). The collar joints are utilized for sewers of big diameter.
Flexible joint: This joint is utilized at such areas where settlement is subject to happen as soon as the pipe is arranged. With this type of joint, one pipe contains spigot end and other pipe contains socket end. The spigot is set up into the socket and the annular space developed among the socket and spigot is stuffed with bitumen.
Expansion joint: This joint is adopted at places where pipes expands or contracts due to variation in atmospheric temperature. Here the socket end is cast flanged and the spigot end is plain. A flanged ring and a rubber gasket are arranged in place on the spigot end. Then the spigot end is entered into the socket end nut and bolts are secured.
Flanged joint: This joint is frequently utilized for temporary work. The pipe applied in this type of joint contains flanges on both ends. At the time of joining the pipes, a rubber gasket is entered among the flanges and nut bolts are secured.
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