Construction Overview
The roof is surrounded by an overhanging sloping roof and is decorated with glazed tiles. The glazed tiles were jointly selected by the construction and supervision department.
S-type series glazed tiles
S-type series glazed tiles include bottom tiles (main tiles) and dripping bottom tiles (dripling main tiles). ), ridge tiles, ridge tile closing, oblique ridge closing and other accessories. Both come in Peacock Blue color. (See attached picture)
The glazed tile roofing method is as follows: 8.5 Concrete board base cleaning, 1:1 cement fine sand mixed with interface agent and shaving treatment 8.5 Sloping roof roof 25mm thick 1:3 cement Mortar plastering leveling layer, including top 100mm*100mm top. 8.5 Brush a layer of plain cement slurry, lay 30mm thick 1:3 cement mortar bonding layer 8.5 glazed tiles, use 25cm long 0.9mm diameter thin copper wire for each bottom tile to be tied to steel nails (25mm long steel nails nailed into the base). Caulk the top of the bottom tile. 8?5 Paint the lower part of the roof ridge three times. 8?5 Cleaning and acceptance
2. Construction preparation:
Double-row external scaffolding is uniformly used for construction. The vertical distance of the scaffolding poles is 1.8m, the horizontal distance is 1.2m, and the step distance is 1.8m. The connecting wall rods and scissor braces are set according to standards to ensure stability. The working floor is covered with scaffolding boards and fastened with small crossbars. The surrounding safety net is closed. Personnel and materials should be dispersed reasonably during construction.
Materials are transported to the roof using gantry frames and trolleys.
The construction of the main body and roof structure has been completed and passed the acceptance inspection.
3. Construction of glazed roof tiles:
Construction sequence: base layer treatment, leveling layer construction → construction laying out → tile selection, tile threading with copper wire → laying bonding layer → tiles Installation and steel nail fixing (bottom-up) → laying ridge tiles → ridge painting → cleaning
3.1 Base treatment:
Before roofing tiles, it must be cleaned and plastered to Seek to make the tiles stick flat and closely to the roof, so that the tile surface is straight and strong. The construction method of the leveling layer is the same as that of the roll roof, but the wood on the surface is rubbed to leave hair.
3.2 Construction setting out:
Centering: Find the horizontal midpoint on the eaves and mark it. This midpoint is the midpoint of the bottom tile in the middle of the roof. Then proceed piece by piece from this point to both sides to the ends of the oblique ridges on both sides. If half a brick is encountered, adjustments should be made.
Pop up the length and short direction control ink lines at the adjusted position. It must be ensured that the long and short directions are perpendicular to each other. The distance between short-direction ink lines should be 2.7m, and the distance between long-direction control ink lines should be two.
Construction plan for cement mortar grouting and hanging granite:
Grouting and wet paving are mainly used for ground projects, and are also used for some interior walls and individual exterior walls below three floors. Wet laying method. The main advantage of wet paving is its low cost.
When selecting wet paving mortar materials, control of the mix ratio is very important. Different boards and different parts require different bonding materials and mix ratios.
The cement used for paving slabs should be 425# Portland cement or 425# ordinary cement. For white cement, 525# ordinary cement should be used.
The mix ratio for paving the floor should be 1:3.5=cement:sand, to hard cement mortar. The bonding layer uses 10:1=cement:107 glue slurry.
The thickness of granite wet paving grouting on the wall should be controlled between 3-5cm. The mortar mix ratio should be cement 1:sand 3, the consistency should be controlled at 8-12cm, and the grouting should be pounded in layers. The height of each pounding and grouting should not exceed 1/3 of the height of the stone slab, and the time interval should be at least 4 hours (the initial setting of the cement mortar). For light-colored, translucent boards (such as white marble and large white), white cement should be used as the bonding mortar. The requirements for the purity of the sand used for mixing are relatively strict. The sand used for mixing must not have impurities, mud or soil, and must be of the same color to prevent the color of the bonding mortar from penetrating into the surface.
One of the main disadvantages of granite wet paving is that white slurry often flows in the gaps on the wall, which affects the decorative effect. The main reason for this phenomenon is that the calcium hydroxide in the cement passes from the joints of the boards during construction. It seeps out from cracks or gaps and reacts with carbon dioxide in the air to form white calcium carbonate crystals. In order to avoid these defects, the back of the granite slab must be scrubbed clean before paving, and then a layer of 1:1 107 cement cement water should be applied to seal it, and it can be paved after it dries and solidifies.
In this way, the gaps in the wall can be prevented to the greatest extent from whitening and slurry return.
In order to reduce and avoid whitening and grouting in the gaps in the wall, the grouting process is very important when paving granite slabs. When grouting, it must be full and dense, and there should be no hollowing.
In addition to the accuracy of the mortar mix ratio, the control of the water-cement ratio of the mortar is very important. In principle, it should be thick rather than thin, but the density of the mortar must be ensured, especially if the granite on the wall is not dense enough or contains If there is too much water, the water will evaporate after the mortar solidifies, leaving pores. The gas staying in the pores will react with the mortar (cement) to produce calcium carbonate, and the surface of the granite will turn white.
The main disadvantages of the traditional wet pasting process
In the early 1980s, both the exterior and interior walls of buildings were installed with reinforced mesh panels. , the old process of fixing the board with copper wire and pouring cement mortar in layers. This process has many disadvantages when used on exterior walls. Not only does calcium bicarbonate precipitate (white frost) and water stains appear after the cement mortar is pasted onto the board, causing the wall stone to change color, causing color difference and contaminating the wall; but also due to temperature changes For other reasons, it is easy to cause common quality problems such as hollowing, cracking, or even falling off of the wall.