Steel-structure demolition method

Abstract

A steel-structure demolition method for demolishing a steel structure by causing the steel structure to collapse, the steel-structure demolition method includes: demolishing the steel structure in such a fashion that the steel structure is cut along a cutting line extending in a direction perpendicular to a depth direction thereof when having collapsed.

What is claimed is: 
     
         1 . A steel-structure demolition method for demolishing a steel structure by causing the steel structure to collapse, the steel-structure demolition method comprising:
 demolishing the steel structure in such a fashion that the steel structure is cut along a cutting line extending in a direction perpendicular to a depth direction thereof when having collapsed.   
     
     
         2 . The steel-structure demolition method according to  claim 1 , wherein
 said demolishing the steel structure comprises:   initially cutting the steel structure along a plurality of cutting lines extending in a direction perpendicular to the depth direction so as to divide the steel structure into a plurality of longitudinal layers such that the plurality of longitudinal layers are aligned in the depth direction;   subsequently cutting a lower portion of a front support pillar of a longitudinal layer in a foremost row out of the plurality of longitudinal layers as well as a diagonal member linked thereto so as to cut and remove a lower layer of pillar bearing an axial force by blasting, thereby causing the longitudinal layer in the foremost row to deform largely in a horizontal direction and collapse; and   causing a longitudinal layer in a next row out of the plurality of longitudinal layers to collapse in a similar fashion after the longitudinal layer in the foremost row has collapsed.   
     
     
         3 . The steel-structure demolition method according to  claim 1 , wherein
 said demolishing the steel structure comprises:   cutting a lower portion of a front support pillar of a longitudinal layer in a foremost row of the steel structure as well as a diagonal member linked thereto so as to cut and remove a lower layer of pillar bearing an axial force by blasting, thereby causing the steel structure as a whole to deform largely in a horizontal direction and horizontally collapse; and   cutting the steel structure along a cutting line extending in a direction perpendicular to the depth direction by blasting during a horizontal collapse.