What is the difference between the precast beam of the bridge and the method of pulling out the rubber tube after pouring the concrete? What's the difference between design and calculation?
The bellows are connected to the corners. To avoid the cement leakage into the bellows, but before pouring concrete, in advance of the corrugated pipe and corrugated tube rubber tube into smaller, and in pouring immediately back and forth several times to drag the rubber tube, Chaimo and then remove the rubber tube, which can effectively prevent the bellows leak into the cement slurry.
Construction process, in order to avoid concrete into bellows, influence later wear steel strand, construction units generally use PVC and other rubber tube into bellows, in order to double insurance, don't let concrete into. Its length is certainly larger than the length of bellows (750mm at one end for easy operation)
Corrugated pipe is included in the design of the amount of engineering, the role is: reserved strand space. Its length is calculated when the work length of the steel strand.
