BUILT-IN GUIDE FOR ENTRANCE OF UNDERGROUND STRUCTURE

摘要

PURPOSE: A built-in guide for an entrance of an underground structure is provided to improve economical efficiency and work efficiency. CONSTITUTION: The built-in guide for an entrance of an underground structure comprises: many guide pipes(20) installed on three sides of an entrance of an underground structure except a side where a hatch(12) is installed; a guide(30) fixed by moving upward along the guide pipe(20) and provided with many cross bars(34) to function as stairs; and a fixing pin(40) fixing the location of the guide(30) when a through-hole(22) of the guide pipe(20) corresponds to a through-hole of the guide(30) and having the same diameter of the through-holes.