Boxspan is a roll formed beam manufactured from two c shaped sections of high tensile zinc coated steel mechanically locked together with a patented process.
Roll formed steel beams.
The popularity of roll formed aluminium lcb has increased due to the efficiency and design of these sections.
Types of roll form.
Roll form rack starts as a coil of steel.
Teardrop step beams have teardrop and rivet design with heavy duty connection plates that allow easy installation and greater connection integrity.
The result a 40 60 lighter beam with the strength of steel and the versatility of timber.
Steel king roll formed teardrop step beams.
Roll formed beam pin connectors and safety locking mechanism provides an automatic engagement when the beam drops firmly into place on the roll formed upright column.
Preferably the cold rolled steel beam is cold formed from a unitary piece of sheet steel.
Us20120328898a1 roll formed steel beam google patents roll formed steel beam download pdf info publication number us20120328898a1.
After the steel has been punched the steel is sent through rollers which shape the steel and give it the shape it requires for strength.
However the vulnerability of aluminium in buckling due to low elastic modulus compared to steel and increased web slenderness of lcbs have raised the issues.
Boltless assembly auto engaging safety clips resist beam disengagement and provide an audible click when secured.