WATER RECLAMATION AND REUSING SYSTEM USING HIGH EFFICIENCY SAND FILTER

摘要

The present invention relates to a structural member (10) for the use as a chord (41, 42) for forming a roof truss (40) for a building. The invention in one aspect broadly resides in an elongated open structural (10) member having a cross section including a minor flange (12), a major flange (13), and a web (14) interconnecting said flanges and having a section axis (11a) at right anglesto the longitudinal axis (11b) of the structural member (10) and passing through the flanges (12, 13) and wherein said web (14) includes a linear portion (17) substantially coincident with the section axis (11a) and a divergent portion (18) which extends to one side of said section axis (11a); said minor flange (12) extends to said one side of said section axis (11a); said major flange (13) extends from said divergent portion (18) to the opposite side of said section axis (11a), and the section configuration being such that an inverted and reversed corresponding open member is nestable within said open structural member (10) with their respective linear section portions (17) alongside one another and with each minor flange (12) located in an abutting relationship against the underside of the adjacent major flange (13).