METHOD FOR ERECTING EXPANSION VENT AND EXPANSION VENT DEVICE

摘要

PURPOSE: To make smaller the size of each expansion vent unit to facilitate truck transportation thereof, eliminate work at an elevated spot required for raising work, perform erection work safely and in a short time, thereby improving efficiency of beam erection work. ;CONSTITUTION: A plurality of expansion vent units A, B, C each comprising space frames 1a, 1b, 1c, which are combined in a telescopic relationship so as to be expandable, are stacked, each being in contracted state, on one another at a vent erection position and then they are connected to each other. And each of the units A, B, C are expanded to a required height, while the space frames 1a, 1b, 1c of each unit A, B, C are locked to each other by means of a fixing means to erect a vent.;COPYRIGHT: (C)1993,JPO&Japio