Installation of waterproof casing pipe slope should be uniform, should not be inverted side slope, appropriate to increase the roof exit slope. Casing through the wall of the wall, such as in the case of non-concrete walls should be replaced with concrete walls, a total of pouring concrete range should be larger than the diameter of the wing ring 200mm, and must be casing once cast solid in the wall. Because it is difficult to replace after forming.
Such as the use of pre-drilled holes in the wall installation, the hole must be greater than one-fifth of the outside diameter of flexible waterproof casing, so as not to install due to too small a void, in the pouring of concrete should be flange pressure plate and rubber sealing ring for protection, to prevent the pressure plate and seal rupture when the pressure is too high during the casting process.
waterproof casing around the protection measures should be taken, the wall concrete pouring height should be 20-30mm above the bottom of the plate. concrete wall after pouring, the upper mouth of the throw out the reinforcement to be organized, with a wooden trowel according to the elevation of the wall surface concrete leveling, in order to prevent concrete blockage bolt holes.
After the installation is completed, because the concrete does not reach the ideal solidification state for a short time, in order to prevent gravity from causing the pre-built waterproof casing to fall, lateral tension devices should be set on both sides. After completing the installation of cast-in-place floors and columns for civil buildings, the waterproof casing should be filled tightly with newspaper and hay before pouring concrete to prevent mortar from entering inside the casing.
