IMPACT ACCELERATION MEASURING METHOD AND DEVICE THEREOF TO CARRY OUT QUALITY CONTROL ON BANKING

摘要

PURPOSE: To carry out quality control on banking speedily/simply by comparing impact acceleration, when a rammer whose lower edge is formed in a semi-spherical shape is dropped freely on the ground surface, with a previously obtained reference. ;CONSTITUTION: An impact force of a weight whose lower edge is formed in a semi- spherical shape, is measured as impact acceleration to soil being a material for banking. Next, this value is compared with impact acceleration being a reference obtained previously from a relationship between dry density and impact acceleration in a room, and impact acceleration to carry out quality control on the banking can be obtained. An impact acceleration testing machine 1 for this is constituted in such a way that, a rammer 1E whose lower edge of a cylindrical body composed of steel as a raw material is formed in a semi-spherical shape, is free dropped on the ground surface so as to be seized as impact acceleration. In the testing machine 1, a diameter of a semi-sphere of the rammer 1E is set to be 60mm, and a total weight of the rammer 1E, a vertical pipe 1D and a handle 1F is set to be 4.5kg. The drop height is set to be 400mm, and a piezoelectric type acceleration sensor 1K is made measurable up to ±1000G, and the accuracy is also set equal to or less than ±1%.;COPYRIGHT: (C)1993,JPO&Japio