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HDD is a steerable trenchless method for underground pipe ducts installation along a prescribed bore path by using a surface-launched drilling rig with a walkover locator. This minimize the impact on the surrounding area with less environmental disturbance.
Slurry method is a remotely controlled pipe jacking operation that provides continuous support to the tunnel shield face by applying mechanical pressure & fluid injection during excavation.
Manshield method is a conventional jacking technique that is done mechanically by labours with the product pipe acting as the support of the tunnel face at the pressure required to prevent subsidence.
Auger method has a protruding cutting head to cut and remove the spoil with a rotating helical augers to carry the spoil to the back of the casing pipe for removal.