First, the requirements:
At present, most stadiums use mostly flexible floors, and flexible floors are installed and installed on the cement mortar surface and cement concrete surface. Therefore, the quality of grassroots construction is self-evident. The conditions for the next step of construction must be met after the conditions of â€œleveling, dense, hard, dry, clean, free from impurities, sand, and cracksâ€ as specified in the national ground engineering quality acceptance specification â€œGB50209-2002â€ are met. .
Second, the construction environment:
Within 48 hours before and after floor installation, the on-site environment must be kept clean and closed. Close the doors and windows to do a good job of blocking wind and rain. In particular, strict control should be exercised on the drying of the ground. Need to pay attention to some points
1. Check the moisture content of the grass roots and keep it below 3%. Use a special moisture meter to test.
2. Detect the moisture content of the ground, and directly measure the relative humidity of the concrete. Note that the test point should be selected in the most humid location, and not in the window or channel. The result of the test value in such areas will be low, but it is not Represents the overall humidity. Also need to pay attention to the test depth. The suspended concrete floor is 20% deeper from the surface; the concrete floor is 40% deeper.
3. The on-site temperature is measured. The indoor surface temperature is the best at 18 degrees. Construction work is not recommended below 5 degrees and above 30 degrees.
4. It is advisable to measure the humidity at the scene and the air humidity should not exceed 60%. If there is a moisture barrier, the relative humidity can be increased to 85%, and if the humidity exceeds 85%, the construction must be stopped. If the environment is very humid, ventilate or lay a moisture barrier before laying the floor.
Third, the basic floor requirements and treatment methods
Before laying the floor, we must first determine the condition of the ground. The quality of the ground will directly affect the overall paving effect in the later period. The ground is smooth, clean and dry. The floor polisher can be used to grind the surface as a whole, so that some difficult-to-clean residues can be removed. Then use a vacuum cleaner of more than 2 kW to vacuum clean the floor. If there is a crack, it can be filled with white cement and gypsum.
Fourth, the interface agent treatment
1, interface agent:
Unless in special circumstances, the interface layer is applied to the primary layer, mainly acting as dust on the ground that cannot be removed after cleaning and cleaning, so as to ensure that the self-leveling layer has a complete interface with the substrate. Balance the water absorption of the grass-roots level, ensure that the grass-roots layer too strong water absorption and lose fluidity, or poor water absorption and affect the strength. Bonding and bridging function enhances the close integration between the self-leveling and the base layer.
2. Painting method:
Divide the interface agent into water at 1:1 ratio. After diluting, use a roller to apply the coating. The high-absorption base layer can be coated with 2 to 3 series. If it is a concrete floor, water treatment is not required. . Do not dilute water on non-absorbent substrates. The drying time is about 1-3 hours. The specific operation method can be performed according to the instructions provided by the interface agent manufacturer.
V. Self-leveling construction
The flatness of the floor is checked with a ruler, ensuring that the gap is no more than 2mm. Self-leveling cement leveling work will directly affect the safety level and life of the floor.
Ensure that the primer is completely dry and free of fluid before application. The primer must be completely absorbed by the substrate.
Put a pack of self-leveling cement into the bucket according to the specified requirements and stir and mix to ensure even stirring. If the conditions permit, special stirrer can be used to stir and the efficiency will be improved a lot. When stirring until there is no lump, let it rest for about 3 minutes, and then stir evenly. The amount of water must be formulated in strict accordance with the ratio, adding too much water will reduce the strength after curing, too little will affect the mobility.
Stir well and pour it on the construction floor. Use a self-leveling file to control the thickness and level the floor. If the thickness is less than or equal to 4mm, you also need to use a toothed scraper for scraping.
After laying, wear special spikes to enter the construction site. Use the self-leveling defoaming roller to roll the self-leveling surface and eliminate bubbles in the self-leveling.
After the completion of the construction, the site shall be closed. Only after 24 hours can the ground be laid and prohibited to move around within the time limit. If it is in winter, the time will be extended to 48 hours later. If you want to polish the self-leveling, choose to do it after 12 hours.
Self-leveling construction tools at a glance
Note: The detailed construction method is based on the instructions provided by the manufacturer of the self-leveling cement.
Six, lay the floor
1, before laying
Prior to laying, roll back the coil and lay it flat on the construction site. Do not rewind. Fold creases should be avoided, otherwise it will affect the effect of the final product. Subsequent surface cleaning of the floor and construction materials.
Spread the adhesive evenly over the surface of the floor to be installed. The concrete floor is highly absorbent. It is recommended to apply 4 to 5 square meters per liter of glue. Pay attention to the uniformity when applying, and do not appear uneven. For absorbent floors, you can begin laying floors after a few minutes.
Note: The specific operation method is based on the glue manufacturer's instructions.
At the beginning of the lay-up, align the first web with the second web, keeping it in the opposite direction. If you encounter unevenness on the edge of the floor, you can place the two floors overlapping and the overlap area is controlled at about 5cm. The construction start position is recommended to be selected at the entrance so as not to crack the floor at the entrance. As far as possible, the coils will rest on the starting wall. If the starting wall is not flat, a long scribe can be used to fit the wall.
When cutting, the construction material is recommended to be 5cm more than the actual amount. The material covered by the corner wall part should be fully pressed by hand (V-shaped) and cut according to the curve of the corner surface of the wall. When cutting out, a certain distance must be left between the wall and the wall, and the position to be covered by the baseboard can be reserved. can.
3, after laying
After the floor is laid, push the floor surface with a soft board to squeeze out the excess air. Then use a 50-70 kg roller to evenly roll the floor and trim the splicing edge. If there is excess glue after rolling, it should be cleaned in time.
Seven seams stitching
After the floor is laid for 24 hours, the glue can be fully cured to start the grooving process, and a special slotter can be used to slot along the joint position. In order to ensure the welding is firm, the slit should not penetrate the bottom. The depth of the groove is recommended to be controlled at two thirds of the floor thickness. In the end of the slotter that cannot be used, it can be treated with a slotting knife, but with the slotter. The effect achieved is consistent.
2, thermal welding
After the grooving is completed, all seams are connected, usually by heat welding. Joints after heat welding can be waterproof, sanitary and sturdy. Before welding, remove the dust and debris from the tank and then use a special welding torch for welding.
Welding Tools - Welding Gun
Before welding, the welding torch should be preheated for several minutes. The temperature is controlled between 350 degrees and 450 degrees. At this time, the temperature can melt the floor and the welding rod. The welding rod is loaded into the welding torch and the first welding rod is pressed into the groove for one minute and then the heat welding torch is moved backwards (it is recommended that it is best to practice before starting the hand).
Observe the condition of the electrode at any time. The strength, temperature, and speed of welding will affect the welding effect. Therefore, it is very important for the construction personnel to operate their skills. The electrode is then pressed into the groove at a uniform rate. The solder joints remain parallel to the floor and directly above the slot.
When the electrode is in a semi-cooled state, use the electrode stripping tool to divide the general part of the extra floor. After cooling completely, use the trowel to completely trim the remaining bulges.
The above is only a description of the construction method under normal circumstances. It may be due to differences in the construction environment and material selection. There may be differences in the methods. It is therefore advisable to carry out simple tests on the field prior to construction to ensure that the final completion results are best.
PVC floor daily maintenance manual
Suspended assembly floor installation process
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