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A conventional anchor block is a reinforced concrete block which is cast around a straight piece of pipe, and which is designed to restrain the pipe against longitudinal movement. The longitudinal thrust from the pipe is transferred into the anchor block via a puddle flange clamped onto the pipe (for DICL pipes) or via a thrust collar welded to the pipe (for MSCL pipes).
To prevent the damge to the pipe which is caused by the unsupported movement
