A SET OF A PLURALITY OF SPREADABLE CORE MEMBERS, AND CORE MEMBER INSTALLING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a set of a plurality of separable core members which can be moved with predetermined intervals made between the plurality of the separable core members respectively in vertical positions in an undermined hole excavated directly below an object buried underground. SOLUTION: The core members are serially connected together with connecting means so as to permit them to be pulled out to a widened state with a wider spacing maintained between respective adjacent separated core members; and the respective core members connected together can be pulled out from their folded position to a spread position by operating a core member operating means manipulated on the ground. COPYRIGHT: (C)2008,JPO&INPIT