Pre-manufactured roof plate element and girder thereto

摘要

A pre-manufactured roof plate element comprising a number of longitudinal box-shaped girders of steel plate, which are upwardly connected with a compressive force plate with almost the same width as the girder, and which preferably are positioned in each side and in the middle of the element. The compressive force plate consists of a corrugated steel plate having a preferably trapezoid shape. A box-shaped girder of the said type is a complement to the roof plate element. A roof plate element or a girder according to the invention may be produced totally without use of organic material.