Is it better to cast a pipe or a channel steel?
Usually with steel and wood structure, the top of the following floor should be suspended with plasterboard. Many students react gypsum suspended ceiling time will crack. This is because, no matter how good the steel is bought, there will always be some deformation, especially in the middle of the house. Lead to the deformation and cracking of the gypsum board close to the steel frame.
The deadweight of concrete is too large to be calculated in tons. If the span is too large, with a reinforced concrete beam reinforced swing down from the middle, on both sides is the main force, the deformation of beam steel tension, resulting in bearing wall deformation.
CastAdvantages: strong, relatively sound insulationDisadvantages: self importantMethods: in the load-bearing wall planting steel, tied with steel, formwork, pouring 10~12cm, waiting for about 28 days molding (summer time is slightly shorter)Watch out:A, pay attention to the proportion of cement and yellow sand and water, the conditional best to buy finished concreteB, when the beam bar open, found in the reinforced beam, the best anchorage reinforcement and ring beam reinforced with imported glue stick, anchorage length is about 13cm;C, after planting tendons, use concrete pouring, pay special attention to the concrete to fill the hole, and side shock side irrigation;D, too large span of the room, it is best not to use cast-in-place.
