How to Install the main keel
1)The main keel should be hung on the boom. Main keel spacing 900 ~ 1000mm. Main keel is divided into light steel keel and T-shaped keel. Light steel keel can be used UC50 keel and UC38 keel. The main keel should be installed parallel to the room long, while the arch should be arch from the height of the room span of 1/200 ~ 1/300. Cantilever section of the main keel should not be greater than 300mm, or should increase the boom. The connection of the main keel should take butt, butt joint of adjacent keel should be staggered.
2)Span is greater than 15m above the ceiling, should be on the main keel, every 15m plus a large keel.