What should be paid attention to in the construction of pu plastic runway?

When I was at school, I often saw pu plastic track, which can also be called all-weather track and field. It looks flat, with high compressive strength and moderate hardness, which is very beneficial for athletes to play. It can be said that pu plastic track can effectively improve athletes' performance and reduce the fall rate. Moreover, running on pu plastic track is easier than ordinary track, and it has certain anti-ultraviolet and anti-aging effects. Then, what are the construction steps of pu plastic track, and what should be paid attention to in the construction of pu plastic track?

Construction steps of polyurethane plastic runway

Step 1, ground joint filling treatment:

1, clean the base surface, wet the base surface with clean water for the new foundation, splash the cement base surface with about 5% dilute hydrochloric acid, and then rinse it with clean water. After cleaning and drying, the base surface should be free of white powder and floating dust.

2. Joint filler: The joint filler of silicone polyurethane stadium is a one-component water-curing material. Before construction, 5% water should be added, and the materials can be poured into the concrete expansion joint after being stirred evenly. Before joint filling, clean concrete expansion joints and apply one-component sealing primer. If the joint is deep or wide, rubber particles can be used as the bottom first, and then filled; Some special depressions can be repaired by caulking materials and rubber compounds.

Step 2, sealing the primer:

1. After the base course is dried, the obvious protruding part shall be polished, and then the sealing primer shall be applied. During construction, the cement base surface should be solid, dry, clean and smooth, free from oil pollution and pulverization.

2. After the construction base is dried, the primer material is evenly coated on the surface of the cement base with a roller to seal the gap on the surface of the cement base, improve the bonding strength between the plastic layer and the surface of the cement base, and make it difficult to delaminate and generate bubbles. If some ground materials are obviously absorbed, roll coating should be repeated once or twice. After the primer layer is dried, proceed to the next process.

Step 3, elastic layer construction:

1. Each barrel of material (25㎏) needs to be added with160g of water, and then stirred evenly with an electric mixer (about 3 minutes) before it can be used.

2. Materials that have been added with water must be used up within 1 hour; Try to use up the opened materials on the same day.

3. The elastic layer shall be constructed by Bo Tu for many times, and the thickness of each layer shall not exceed 2mm. The interval between each layer shall be the previous drying time (generally about 10 hour).

4. Pay attention to the leveling effect when scraping. If you can't scrape the scratch, you need to add a special thinner to adjust the consistency and ensure the surface is flat.

5. After the elastic layer is dried and solidified, the surface flatness is detected by water accumulation method. The place with accumulated water shall be repaired and leveled with buffer layer material, and the place with mixed or accumulated granular sundries on the surface shall be polished and leveled with a mill before the next working procedure is constructed.

The fourth step, the stable layer construction:

1. Each barrel of material (25㎏) of the stable layer needs to be mixed with 80g of water, and then it can be used by an electric mixer (about 3 minutes).

2. Materials that have been added with water must be used up within 1 hour; Try to use up the opened materials on the same day.

3. Miscellaneous or uneven materials in the construction process need to be trimmed and leveled before the next working procedure.

Step 5, underline:

1, marking paint construction requirements: A:B= 1:4, mix and stir evenly before construction.

2. During construction, mark the boundary position according to the size of the stadium, stick it on both sides of the boundary with masking paper, and directly construct it with a small oil brush. Brush the marking paint on the surface of the silicon PU court once or twice, and tear off the masking paper after the surface is dry.

What should be paid attention to in the construction of pu plastic runway?

1. Before construction, the quality of asphalt concrete foundation must be inspected and accepted according to design standards and technical specifications. The plastic runway can be used all day if there are corresponding drainage facilities. The ambient temperature for site paving should be controlled at 5℃~38℃, so as to avoid operation when the ambient temperature is lower than 5℃ and higher than 38℃. The relative humidity should be controlled below 70%, and the foundation should be smooth and clean. The dosage of catalyst should be adjusted according to the temperature and relative humidity to properly control the curing speed. When storing color paste and prepolymer, the barrel cover should be tightened, and the water content should be detected before use. After use, the water content in foundation should be controlled to avoid bubbles after gel formation. The quality inspection certificate and validity period of plastic paving materials must be carefully checked when they leave the factory.

2. Mold nail:? Nail the wood grain strips wrapped with polyethylene film along the drawn bottom line according to the pre-arranged area. Mould strips should be flat and fixed with anchor nails to prevent leakage.

3. The bottom line of surveying and mapping:? In order to arrange the daily paving workload reasonably, we must first measure and draw the dividing line according to the set plan, divide the whole track and field into blocks, and then pave one by one. In order to ensure smooth drainage and few joints, the construction procedure of first inner ring and then outer ring is adopted.

4. Preparation of finished products:? According to the paving area, the required semi-finished products are calculated, and the required slurry and prepolymer are hoisted to the operation platform respectively, and discharged neatly according to the batch number. Put the required black colloidal particles and catalyst in proper positions on the operating table respectively.

5. After the plastic runway is laid, it can be used normally after 7~ 10 days of maintenance.

Through the above article, we know what the construction steps of pu plastic track are and what we should pay attention to in the construction of pu plastic track. At present, most school sports grounds use pu plastic track, because it is very convenient to maintain and can save management costs. In terms of safety, pu plastic track can reduce fall accidents, with strong adhesion and smooth appearance, and can moderately absorb the impact of footsteps, thus reducing sports injuries, and can be used as a venue for long-term training and competition.

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