PURPOSE: To enable a simple, highly precise and highly reliable measuring of a ground durability, by measuring a load applied to the ground and subsidence of the ground corresponding to the load by means of a pressure gauge after applying the load to a loaded plate situated on the test ground through a reaction force receiving device by means of a loading device.
CONSTITUTION: Screw anchors 4 are inserted at a ground durability testing position of the ground 2, and reaction force receiving beams 6 and 7 are placed at an upper part of the screw anchors. Is then installed a loading device 11 being composed of a loaded plate 12, a hydraulic jack 13, a rod 14, and a proving ring 18. The loaded plate 12 is loaded by the hydraulic jack 13, and thus, the loaded plate 12 is subsided. A loading reaction force is received at a reaction force receiving device 1 after passing through a support 15, the proving ring 18, and a plate 20, and a loading amount is determined from displacement of a spindle 17 of a dial gauge 7 caused as a result of the proving ring 18 being bent. On the other hand, a subsidence amount of the ground is indicated by a subsiding amount measuring dial gauge 26, and the ground durability can be reliably measured from the load amount and the ground subsidence amount corresponding to the aforesaid loaded amount.
USAMI KATSUSHI
SHIMIZU ISAMU
MORITA KINSAKU
MIWA HIDEKI
OBATA JIROU
