The word "channel steel hole" is a very sensitive word in the minds of all house buyers. When buying a house, everyone will say that I don’t want to buy channel steel layer. I believe everyone is scared by the news about the leak of channel steel holes on the Internet. Arrived, in fact, there are already detailed construction techniques for channel steel hole sealing in construction projects to prevent channel steel holes from leaking.
Channel steel tunnel plugging The general construction will have the following steps: 1. Shaving around the hole, 2. Formwork support, 3. Pouring concrete, 4. Formwork removal, 5. Concrete maintenance, 6. Screw hole Sealing, 7. Waterproof coating construction. The following is a detailed description of the construction methods and functions of each step.
1. Shaving treatment around the hole
channel steel After the channel steel is removed, the hole has a rectangular hole. Because the reserved hole is generally supported by a template, the surrounding surface is generally smooth, in order to seal The channel steel layer is a better combination of new and old concrete, so it needs to be chiseled.
2. After the chiseling is completed, the scraping garbage will be cleaned up and a template will be installed, and a pair of drawing screws will be added in the middle of the template (if a non-water-stop screw is used to increase the screw hole process in the later stage) to reinforce the template. When the formwork is made, the outer side is completely closed and the inner side adopts a bell mouth and is higher than the hole to make the concrete pouring dense.
3. Because the channel steel hole is a post-pouring hole in the home concrete, micro-expansion concrete is generally used. After pouring, the volume of the concrete will increase after solidification to make the hole concrete more compact.
4 The formwork is removed after the concrete has finally set.
5. Because micro-expansion concrete is used, it is necessary to strengthen the curing in the later stage to make the concrete expand to achieve better results.
6. If the water stop screw is not used, the screw hole used in the reinforcement template should be sealed before the exterior wall decoration.
7. Waterproof construction of channel steel hole before exterior wall decoration, generally use polyurethane waterproof coating to paint twice, and the painting area is larger than the opening area.
If the channel steel layer is constructed in accordance with the specifications during the later sealing of the channel steel hole, it will generally not leak, but the leakage risk will be greater than that of the overall concrete wall. If you encounter bad construction companies that do not seal channel steel holes according to regulations, the risk of leakage will be greater. (The screw hole plugging process will be written in detail in the next issue)
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