As the existing post is removed, pile hole excavation modulo and its device null which dig the pile hole for the newly founded post

摘要

PURPOSE:To efficiently remove an existing pile by fitting a rotatable bucket on the peripheral section of the existing pile, expanding a pile hole, rotating the upper portion of the pile, and rupturing the pile in the radial direction with jet water. CONSTITUTION:A casing 9 is pushed in, the sediment on an existing pile (a) is removed, a bucket 2 is lowered while being rotated, the high-pressure water containing a granular abrasive is sprayed through the nozzle 15 of a jet water spraying mechanism 5. A vertical hole (b) is formed at the center of the pile (a), the ground around the pile (a) is dug by a digging means 8 to expand a pile hole. When a bucket 2 is fitted to the upper section of the pile (a), the high-pressure water containing the abrasive is sprayed through a nozzle 16 and the nozzle 19 of a jet water spraying mechanism 6 to rupture the pile (a) in the radial direction. The bucket 2 is swayed together with the casing 9, the upper end portion of the pile (a) is cut off. A pressing member 12 is retreated, the casing 9 is removed, the bucket 2 is lifted, the cut off portion of the pile (a) is removed on the ground.