Grass-roots cleaning, watering and wetting, vertical hanging, square setting, looking for rules, plastering cakes, plastering cement skirting or dado, plastering cement windowsill as corner protector, reinforcing steel bars on the wall, plastering bottom ash, repairing reserved holes, electrical boxes, boxes, etc. , plaster cover ash.
2. Operation process
(1) grass-roots cleaning
1) Brick masonry: surface impurities, residual mortar, tongue ash, dust, etc. Will be removed.
2) Concrete matrix: After the surface is wetted with water, roughen or brush 1: 1 cement mortar (add proper amount of adhesive or interfacial agent).
3) Aerated concrete matrix: The interface agent shall be wetted and then painted, and the cement mixed mortar with strength not greater than M5 shall be painted at the same time.
(2) Water and moisture
Generally, the day before plastering, water the wall from top to bottom with hose or rubber hose or watering can, and water it twice a day.
(3) hang vertically, set square, find rules, and make ash cakes.
According to the quality of plastering required by the design drawings, according to the smoothness and verticality of the base surface, with a wall as the benchmark, hang vertically, find rules in a set of ways, and determine the plastering thickness, which should not be less than 7 mm When the concavity of the wall surface is large, it should be crossed by layers. The thickness of each layer shall not exceed 7 ~ 9mm. When operating, plaster the cake first, and then plaster the cake. When plastering the cake, determine the correct position of the ash cake according to the indoor plastering requirements, and then use the ruler to find the verticality and flatness. The ash cake should be plastered with 1: 3 cement mortar into a 5cm square shape.
When the room area is large, the center line of the cross should be popped up on the ground first, and then the corner line should be popped up according to the flatness of the base surface. Then hang the line at the lOOmm away from the internal corner of the wall and pop up the vertical line. Then, according to the external corner line popped up on the ground, transfer the wall plastering layer thickness control line on both sides of the internal corner to the wall to make ash cakes, and then fill the steel bars according to the ash cakes.
(4) wipe the skirting cement (or dado)
According to the reinforcement of plastering ash cake (this reinforcement can be punched wider, and 8 ~ LOCM is appropriate, so this reinforcement is the basis for plastering skirting or dado, and also the basis for plastering wall surface), the bottom layer is plastered with L: 3 cement mortar, leveled with big poles after plastering, and rubbed with a wood trowel. The next day, at room temperature, it is plastered and calendered with 1: 2.5 cement mortar, and the thickness of plastering skirting or dado should be. L5 1 The skirting board or dado protruding from the plastered wall must be straight. The skirting line or wall surface should be leveled with a ruler at the top of the bedding face and mouth, and then Vl should be leveled with a small trowel and calendered. The edges and corners protruding from the wall should be obtuse, and stubble and flash are not allowed.
(5) do corner protectors
The external angle between walls and columns shall be protected with 1: 2 cement mortar before plastering the walls and cylinders, and its height shall be 2m from the ground. See figure 1. 1.6.2 for details, and then water the external corners of the walls and columns for wetting. The first step is to erect a figure-of-eight guide rule on the front of the external angle, highlighting the side of the external angle, and the thickness is flat with the surviving plastering surface. Then at the edge of Yang angle, cement mortar shall be plastered by a ruler, and it shall be leveled with an iron trowel, and the excess cement mortar shall be leveled according to the width of layering (not less than 5cm). Step 2: When the cement mortar is slightly dry, move the figure-of-eight guide rule to the plastered corner protector (figure-of-eight outward). Positive Yang Angle, on the edge of the ruler with cement mortar, with iron trowel screeding, redundant cement mortar according to the bead width. After plastering, remove the eight-character guide rule, brush the corner protector with plain cement slurry, and draw from top to bottom with an angle encoder to form an obtuse angle.
(6) Cement windowsill
Clean up the window sill base first, and the loose bricks should be mended again. Brick joints should be deep, fully wetted with water, and then paved with 1:2:3 pisolite concrete, the thickness should be greater than 2. Brush the bonded plain cement again the next day, and then apply the L: 2.5 cement mortar surface. After the surface reaches the initial setting, it shall be watered and maintained for 2 ~ 3 days, and the plaster under the window sill shall be straight without burr.
(7) Wall reinforcement
When the ash cake mortar reaches 70% to 80% dry, it can be filled with the same mortar as the plastering layer, and the number of steel bars should be determined according to the width and height of the room. Generally speaking, the width of steel bars is. The distance between two ribs shall not exceed 1. When the height of the wall is less than 3, vertical poles should be made. More than three. To do transverse reinforcement, the spacing between ash cakes should not be greater than when doing transverse reinforcement.
(8) with bottom ash
Under normal circumstances, it is advisable to start plastering about 2 hours after the reinforcement is completed. Before plastering, a thin layer of ash should be applied, and the matrix should be plastered tightly. When plastering, mortar shall be forced into small gaps, then leveled by layers with a file, leveled with wooden poles, and leveled with a wooden trowel. Then comprehensively check whether the foundation ash is smooth, whether the angle of Yin and Yang is straight and tidy, whether the junction between the pipe tail and the angle of Yin and whether the junction between the wall and the roof is straight, and check the verticality and flatness of the wall with a supporting plate. Wall plastering after radiator should be carried out before radiator installation. The plastering surface should be smooth, and the skirting board or dado on the back of the ground and pipeline should be cleaned up in time to ensure the end of the work.
(9) Wipe the reserved holes, distribution boxes, slots and boxes.
Immediately after the bottom ash is leveled, assign personnel to scrape off the ash sand around the reserved holes, distribution boxes, troughs and boxes and clean them up. Then use a big brush to wet the holes, boxes, grooves and boxes along the periphery, and then use L: 1: 4 cement mortar to smooth the holes, boxes, grooves and boxes.
(10) plaster layer ash.
When the bottom ash is 60% to 70% dry, the top ash should be plastered (if the bottom ash is too dry, it should be watered and moistened). The top ash will remain twice, and the thickness is about. It is best for two people to cooperate at the same time when operating. One person scraped the thin ash first, and the other immediately smoothed it out. From top to bottom, and then press the calender. When pressing, it is necessary to master the temperature, neither water streaks nor pressing. After pressing, immediately dip the brush in water and clean up the dust on the cover. Don't break the whole wall during construction. If there are reserved construction holes, it is advisable to leave the whole wall for wiping.
—— Excerpted from Technical Standard for Construction of Building Decoration Engineering