Supporting construction of a building comprising standards and rafters, a rafter and a method of manufacturing a rafter

摘要

Supporting construction of a building comprising stan dards and rafters supported by said standards, wherein the raf ters are construed for supporting a saddle roof of the building, and at least part of the rafters is construed aut of a I-type beam having a middle part and two parallel side parts that are perpendicular to the middle part, wherein the middle part is provided with a castellated slit in the middle part at prede fined distances with respect to the side parts, and the result ing two complementary middle part elements are staggered and again welded to each other SO as to have these middle part ele ments define a series of apertures in the middle part between the two side parts.