What are the repair methods for external walls? 1. pressure grouting method: it is suitable for repairing concrete cracks with a width of 0.2-0.3 mm When the number of cracks is large or large, the cracks should be cleaned and closed first to expose small cracks, and the grouting nozzle should be wrapped tightly with keys. During grouting, firstly, the grouting liquid is sucked out by the joint filler, inserted into the grouting nozzle, and the piston of the joint filler is pushed by hand, so that the slurry is pressed into the crack through the grouting nozzle. When the slurry flows out from the adjacent nozzle, the joint patching device can be pulled out and the aluminum rivet can be plugged.
2. Slotting and joint filling method: it is suitable for cracks with a large width but a small number, and slots are allowed in the structure. First, use a chisel and a flat shovel to open a U-shaped groove along the crack, and use a brush to brush a layer of interface between the groove bottom and the two walls to treat the slurry. Before the treated mortar hardens, press the mixed cement mortar into the groove with a spatula, compact and smooth it, and preferably cover it with a plastic film.
3. Coating caulking method: it is suitable for repairing micro-cracks with a width less than 0.2 mm Cracks, pores and defects on the concrete surface are filled with putty (concrete patching glue: powder = 1: 1.8-2.0), dried, smoothed with emery cloth, and then primed. Before using the paint, it should be filtered through the iron window screen to remove impurities and caking.
What are the precautions for exterior wall maintenance? 1. The house should be vacated as much as possible to make room for decoration and construction. If it is really impossible to move out, it can be completely enclosed and placed in a position that does not affect the construction.
2. When the doors and windows of the facade are removed, the permission of the residential property or housing management department must be obtained in advance, and it is a residence facing the main street.
3. If the wall is demolished or new doors and windows are opened due to the need to adjust the indoor layout, remember not to dismantle the load-bearing wall, because the load-bearing wall is related to the safety of the overall structure of the house. The demolition of ordinary walls should also obtain the consent of the property right or the housing management department in advance.
4. Understand the laying direction, location and pipe diameter of the hydropower pipeline in the residential area, and communicate with the home improvement company about the decoration scheme. If there is any requirement to change the gas system, it should be changed through the gas department. For some intelligent systems and preventive systems installed in houses, it is necessary to contact professional manufacturers or properties in advance to take protective measures.