HOLDING OF EXCAVATED PIT FOR RUBBLE LAYER

摘要

PURPOSE:To hold excavated pit for rubble layer with good efficiency by a method in which a pit is excavated in a rubble layer by an auger screw, and slurried sand is packed into the pit through the hollow shaft of the screw while pulling out the screw. CONSTITUTION:A hollow casing 1 is turned to the direction of arrow A, and an auger screw 2 is turned to the direction of arrow B to excavate a pit 5 in a rubble layer 4 on the bottom 3 under water. While pulling out the screw 2, slurried sand 7 is packed through the hollow shaft 2A into the pit 5. After the casing 1 is drawn out, a pile is driven into the sand 7 in the pit 5.