Composite plastic runway is based on the production of mixed bottom layer breathable surface layer, which can shorten the construction period, and can not remove particles and reduce costs.
Construction preparation:
1. Quality inspection on concrete surface: Inquire Party A for sample analysis report of concrete physical properties (such as compressive strength, thermal stability coefficient, body expansion rate, body water absorption rate, etc.) and density, key inspection thermal stability coefficient report And density two indicators.
2. Measure the flatness and slope of the concrete foundation on site. Use a theodolite for every 5 degrees to put a line, every 3 meters mark a point, put a 3m ruler between any two adjacent points and measure with a plug gauge (foot), the local maximum depression not exceeding 3mm is an acceptable point, greater than 3mm For the unqualified spots, the pass rate of the whole site measuring point reached 85% as qualified, >94% was good, and ≥95% was excellent.
3. The elevation of the leveling axis and the elevation (relative) of each control reference point shall be in accordance with the requirements of the course manual, and the gradient shall not be greater than 0.5%.
4. The designated person shall include the weather forecast information, and shall contact the local meteorological station to master the local medium and short-term meteorological information during the construction period, and timely adjust the construction arrangements to ensure the quality of the paving work, and the progress will not be affected by the climate temperature and air humidity.
Construction process:
First, sports ground treatment
1. Original excavation excavator:
After positioning and elevation measurement of the entire site, the area and thickness of the deep-digging soil were calculated and the construction was started. This process included excavation of earthwork, extra-earth transport, leveling of the site, and consolidation of the original soil.
2, leveling, compaction site:
The roller is pressed along the vertical direction of the site and from the edge to the center. The speed is 25-30m/min.
The entire solid up until the general pressure 5 to 8 times, so that its density ≥ 95%.
Second, drainage ditch construction
1. Drainage trench excavation The earth excavation has an average depth of 1000mm and a width of 1000mm. The foundation of the ditch is leveled to meet the slope requirement and is manually compacted.
2. The bottom layer is laid with a 100mm thick 6% cement stone cushion, and then a 80mm thick C15 concrete layer is laid on it.
3. Brick wall made of M5 cement mortar is used as drainage ditch, 240mm thick, 5mm thick M2.5 cement mortar plaster in the ditch, and the inner wall net width is 320m.
4. The ditch cover adopts 500mm (length) × 500mm (width) × 70mm (thickness) reinforced concrete prefabricated components, 6 squat 8mm steel bars are arranged inside, and a 250mm (length) × 30mm (width) discharge water is provided on the cover plate. hole.
5. The bottom of the grit chamber is 150mm lower than the bottom of the gutter, and its width is the same as the clearance in the gutter with a length of 400mm.
6. Apply a layer of polymer waterproof material on the cover of the ditch. The function is to prevent the surface layer of plastic blisters from rising due to the water vapor of the cover plate.
Third, the runway and semicircle area concrete foundation construction
1, gravel cushion
Laying gravel cushion 150mm thick. Crushed stone particle size of 30-80mm, stone powder filling.
2, cement stone stabilizer
Laying 100mm thick 6% cement stone stable layer, the compacted density reaches 2.2kg/L, its thickness allows 5% deviation, appearance, smooth surface, no sand nest, no loose.
3, C20 concrete layer
Concrete strength is C20, thickness is 100mm, concrete surface should be smoothed (matte surface), no floating soil, sand, cracks and other phenomena. The finished flatness is measured with a 3M ruler. The flatness difference is within 3mm and the sum of the error areas does not exceed 5% of the total area.
Fourth, composite PU plastic runway surface layer
(1)Material: The plastic elastomer of the runway is composed of Group A and Group B. The composition of Group A is mainly the raw materials for the synthesis of polyurethane raw materials, and the composition of Group B is divided into vulcanizing agent, imported coloring material and various additives. .
(2) Construction preparation:
1 Stir place should be covered with a layer of plastic strips to ensure the ground is clean.
2 When the material is activated, the cover must be cleaned first.
3 Pour the hardener (clear liquid) first into the mixer, then pour the main agent (color liquid).
4 When stirring, the mixer should rotate forward and backward, and the mixing time should be 2-3 minutes, so that the material is fully stirred.
(3) Construction process:
1 black elastic rubber layer: The environment-friendly black high elastic rubber particles, high-strength environmental protection cross-linking agent, various additives mixed, stirring evenly, on-site paving 8-9mm thick, and then use special tools to level and compact. The finished flatness is measured with a 3M ruler. The flatness difference is within 3mm and the sum of the error areas does not exceed 5% of the total area. Twenty-four hour room temperature vulcanization maintenance.
effect:
a. enhance the elasticity of the surface layer;
b. Leveling the site;
c. Solved the problem that PU plastic cannot be laid due to concrete sanding.
2 Mix Group A and Group B and black powder in proportion and glue the bottom layer of black rubber.
3 After the bottom layer is solidified, mix the well-mixed A/B compound adhesive (without black particles) into the site for paving.
4 Using special tools, according to the construction requirements, the mixture shall be leveled and partially leveled manually with the thickness controlled between 2-2.5mm.
5 Uniformly spread a layer of 4-5mm EPDM non-slip and wear-resistant particles over a uniform field. After solidification and bonding, use a bamboo broom to remove unbonded solid particles.
6 After the second day of construction, clean up the joints after curing, and smooth the edges. After the laying, the site should be leveled.
7 Roll a layer of sun-resistant, wear-resistant and anti-thickening protective layer on the surface layer. After the construction is completed, the surface color should be uniform.
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