First, several methods of ultra-flat ground
1, there is actually only one common method for ultra-flat ground. The main equipment of the ultra-flat ground includes: the laser grader carries out the preliminary packaging grader work, and the tolerance requirement of the ultra-flat standard is 3m/2mm. The laser grader has completed the foundation board, and of course, it needs the cooperation of lighting construction to better carry out the foundation construction.
2. The laser grader requires high construction quality, which can effectively level the ground and significantly improve the flatness of the ground. Compared with the traditional method, the smoothness will be improved by more than three times, cracks are not easy to appear after construction, and the construction speed is fast and simple and easy to operate.
Second, the ultra-flat ground construction technology
1 First, inspect the site to verify the elevation of steel bars, and then inspect the materials and equipment. After the materials and equipment pass the inspection, waterproof plastic film shall be laid or the base surface of concrete cushion shall be treated, and deformation joints shall be installed.
2, template, building steel joints, force transmission system installation, etc. , setting reinforcing ribs, laying partition boards on wall columns, and then debugging the concrete quality. First with reinforced concrete pouring, pumping pouring.
3, with ultra-high frequency vibration wave vibrator level off the ground, but don't excessive vibration, prevent concrete separation. The edges and corners should be leveled with scratches, then with manual scratches, and the uneven ground should be leveled with manual level in turn. The flatness is detected once, and it is detected many times manually, and then polished by a polishing machine.
4. The next step is polishing with a double-disk polishing machine. Dry-lay the wear-resistant material first, and ensure the uniformity, thickness and flatness of the material during the laying process, then polish it with a double-disc polisher, and then edge-trim it with an angle grinder.
5. First, use a double-disc polisher with a metal blade to start polishing. Polishing must be carried out at least three times, and the edge must be polished by a single-disc polisher and a polisher; After re-polishing with a plastic blade, the ground will be less marked, the color will be more uniform and the surface will be brighter.
6. Grind and polish the ground again. After the floor surface is dry, spray it on the ground with sprayer and concrete liquid hardener, and keep the ground moist for more than 20 minutes. Use a ground grinder with a resin grinding plate to grind the ground, and then use a vacuum cleaner or scraper to remove excess materials from the ground.
Three. Acceptance criteria for ultra-flat ground
1. Smoothness F value: when measured along the survey line in the survey area, it drops by a continuous value every 1 foot (300mm), indicating the roughness of the ground.
2.f levelness value: it is the drop per 10 foot (3m) continuous distance along the measuring line of the measured area, indicating the degree of conformity with the floor.
The above is the introduction of several methods, construction technology and acceptance criteria of ultra-flat ground brought by Bian Xiao.