What is hidden engineering

1. Water supply and drainage engineering
As galvanized pipes are easy to rust, foul, do not keep warm, and will freeze and crack, they will be phased out. At present, the most used are plastic-aluminum composite pipes, plastic steel pipes, and PPR pipes. These pipes have good plasticity and toughness, and the heat preservation does not crack or deposit. Special copper joints or thermoplastic joints are used, which guarantees quality and low energy consumption.
2. Electrical pipeline engineering
Generally, the power cord is divided into hard wire, flexible wire, sheathed wire, etc. According to the thickness of the copper core, it is divided into 1 square millimeter wire, 1.5 square millimeter wire, 2.5 square millimeter wire… For safety reasons, it is more convenient to maintain. Set of casing. In addition, audio cables and signal cables are commonly used. Sockets are divided into 10A, 15A, etc. There are also many brands, and there are many counterfeit ones. Inferior sockets are prone to accidents. It is recommended to buy them at regular electrical appliance stores. Electrical wiring engineering requires construction specifications, and workers should hold certificates to ensure safety and eliminate hidden dangers.
3. Floor base
There are two methods for the base of solid wood flooring: one is to apply cold base oil on the cement floor, lay the wooden keel, and finally nail the floor; the other method is to lay a layer of blockboard on the keel, or the wool floor, and then nail Floor, using this method, the floor is evenly stressed and the structure is firm. Composite flooring is easy to install, and there are two ways for the base layer: one is to make a leveling layer first, then pave the PVC cushion, and then to lay the composite floor; the other is to lay the wooden keel and wool floor on the cement leveling layer, and the two composite floors are laid.
4. Base layer of retaining wall
There are flat and concave-convex wall panels. The method is to first brush a layer of cold base oil on the wall, then install a 30mm*40mm wooden keel, nail multi-layer boards or blockboard on this basis, and finally nail the veneer plywood. In order to prevent mildew, a series of courage holes with a diameter of 6mm were opened in the upper part of the wall panel.
5. Basic layer of door and window cover
The keel is arranged first, then the blockboard or density board is nailed, and the surface is nailed with the veneer splint. Note that the MDF is soaked in water to avoid expansion in the future.