Composite support beam for use in support structures of slab formwork in building, has profile made of steel, where parts of profile are exposed to external environment and coated by water-tight binder such as polyurethane resin

摘要

The beam (1) has a profile (2) made of a material containing aluminum, and another profile (3a) made of another material i.e. steel. The profiles are interdependent with each other by attaching units (4, 5). The latter material includes young's modulus higher than that of young's modulus of the former material. Parts of the latter profile are exposed to an external environment and coated by a water-tight binder (6) i.e. polyurethane resin. The former profile comprises an I-shaped cross section with a core (2a) for connecting two soles (2b, 2c). The polyurethane resin is obtained by a mixture of BAYDUR 6700 Z(RTM: modern polyurethane material) product and DESMODUR(RTM: Aliphatic and Aromatic Polyisocyanate-Hardener) product.