CONSTRUCTION OF UNDERGROUND BUILDING FRAME

PURPOSE:To reduce driving processes of earth anchors into the ground and curtail the construction period, by connecting the earth anchor jointed with a jack for settling of a caisson to a foundation pile widened at the front end to unify together therewith. CONSTITUTION:A plurality of foundation piles 12,... widened at the front end thereof are driven into the ground within the range where a caisson composed of a plurality of lot frames 11a, 11b is settled. Next, the front ends of a plurality of earth anchors 4, 4 are connected to the foundation piles 12 respectively and the rear end thereof is connected to a plurality of hydraulic jacks 5,... When constructing the caisson, the lot frames 11a, 11b are pressurized by a pressing device composed of the hydraulic jacks 5 and the earth anchors 4 to settle and immerse the caisson into the ground. At this time, since the foundation piles are widened at the front end, the intrinsic tension can be kept even if the earth anchors are connected together as a unit.