Sports floor
(A) sports floor terminology explanation
Sports floor also belongs to PVC floor, and sports floor belongs to "PVC foam bottom coil floor". The sports floor is generally thick and designed for sports venues, such as badminton hall, table tennis hall and basketball hall, so we commonly call it "sports floor".
(2) Requirements before construction of sports floor
1. Surface smoothness requirements: According to GB-50209-20 10, the surface smoothness requirements shall be checked with 2m guide rule and feeler gauge. The gap should not exceed 4 mm.
2. Strength requirements: In order to ensure that the paved ground has enough strength to support the structural load of each layer on it. The floor should be kept on a horizontal datum. According to the requirements of the construction of elastic floor for ground strength, the high velocity should be C25 and above, and the low velocity should be C20 and above. Pull-off strength requires high flow rate greater than 1.2Mpa and low flow rate greater than 0.8Mpa.
3. Dryness requirement: The moisture content in the European standard should not exceed 2%, while China has a subtropical climate, especially in the southern region, where the air is humid and generally cannot meet the requirements of the European standard. Generally, the water content we control is within 3.5%.
4. The construction environment temperature should be 65438 05℃ ~ 28℃. When the temperature is lower than 10℃ or higher than 35℃, construction is prohibited. The relative humidity of air should be 35% ~ 75% RH. If the temperature and humidity do not meet the requirements, measures should be taken, otherwise construction is prohibited.
5. Floor cleanliness requirements: residual substances such as oil, wax, paint and pigment must be removed: the floor must be cleaned before laying to ensure the effect.
Elastic floor-sports floor
(III) Introduction and use of adhesives
The glue of sports floor has a special kind of coil glue, which is water-based and filled. The main component is acrylic emulsion. Sports floor can also use two-component polyurethane glue, which is generally used in damp-proof and waterproof places, and the operation is very difficult.
Elastic floor-sports floor
(4) Construction steps of sports floor
1, foundation treatment:
The general basis is to complete self-leveling land. The ground surface of self-leveling foundation shall be polished with 60-80 mesh sandpaper grinder to make it smooth and clean. The foundation can also be fixed firmly with wooden boards, and the surface is peeling. White latex mixed with sawdust is used to smooth the joints and make them smooth. It can also be an old PVC floor, which requires smoothness and firmness.
2, preparation before construction
Before installation, the coiled material and glue enter the site in advance to adapt to the environmental temperature at the site; .
Design and typesetting before installation. And put a sports floor on the ground in advance to relieve the stress of the floor itself.
It usually takes 24 hours.
Elastic floor-sports floor
(E) Sports floor paving technology
1, full-glue brick sticking process
Arrange the pre-laid floor materials according to the typesetting adjustment, and the two materials overlap by 3 cm.
Pop up the center line of 3 cm with toner Mo Dou, push and cut the floor along the center line with a push plate, remove the redundant floor strips, and adjust the flat-fell seam of two floors to about 0.5 mm. ..
Gently roll up the floor material by half to expose the base.
Apply glue where the floor material is rolled up, and use a 2-tooth scraper. After scraping, air dry the glue for about 3 to 10 minutes, which shows that the color of the glue changes gradually. Touch the glue surface with your hands and it is sticky. Transfer the glue to push the floor.
First, push the air out of the floor with a cork board, and then crush it from the middle to both sides with a 50 kg pressure wheel.
Open another floor and do the same thing.
Hot-melt welding, complete the floor paving for more than 6 hours, and open a 3 mm wide U-shaped groove with a grooving machine. Use a hot-melt welding gun to weld with a special welding wire for the sports floor, and then remove the excess welding wire twice.
2. Brief introduction of double-sided adhesive tape laying process
(1) Silicone double-sided adhesive tape is not used to bond sports floors in China at present. Duct tape of 8- 10 cm is generally used. This kind of adhesive tape has a gum base as pressure-sensitive adhesive emulsion, which has a good construction experience, but the final adhesion is poor. There is a great quality risk.
(2) In fact, the method of sticking adhesive tape is basically the same as the above process, except that double-sided adhesive tape is used instead of full scraping adhesive at joints and corners. The construction method is easy to accept.
(6) Precautions for laying sports floor
Floors should not be stacked during transportation and storage, otherwise it will easily cause floor deformation.
Choose the right glue, control the drying time of glue, control the single scraping area and grasp the opening time, so as to avoid the opening time being too long, the glue will not transfer, and the bonding effect of glue will be reduced or even lost.
Do not use solvent-based all-purpose adhesive. The solvent in the all-purpose adhesive will react with the plasticizer in PVC to form a non-stick liquid, which will soon make the floor fall off.