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• Telescopic Shaft

The stress and strain imposed on vertical HDPE pipes in landfills is immense due to settlement within the waste itself. Vertical pipes are subject to both axial and radial stresses, but the axial stress is by far the most damaging. It is caused by 'skin friction' between the outside wall of the pipe and the surrounding waste as it settles. Loads as high as 100Tf are not uncommon.

If axial movement can be accommodated during settlement by the use of telescopic shafts, then axial stress is eliminated.

Features:

	Move axially during settlement
	Act as a column, not as individual sections
	Have minimum lateral deflection at the joints
	Able to accommodate settlement over the entire length including the bottom of the base section
	Known and repeatable shear pin strength
	Tested shear pin strength
	Can be built up in 3m sections as filling occurs
	Accommodate over 30% settlement
	No requirement for gravel surround other than base section
	Pipes designed to resist radial stress
	Same wall thickness throughout length for simple site installation