1. The pressure is high, stable and reliable, so that the chemical grout can completely enter the deep micro cracks of the concrete structure, and the water stop effect is good.
2. The grouting fluid technology is mature, and the variety is complete. Basically, it has realized the production of single component finished products. There is no need to mix on site, and the quality is stable. It can be used after opening the barrel. The slurry is resistant to chemical corrosion, * * *, environmentally friendly and waterproof after curing.
3. The construction process is simple and easy. The construction speed is fast, and the water stop effect is immediate, once and for all. The labor intensity of workers is small, and the construction efficiency is 5~10 times that of traditional construction methods, which are incomparable.
4. The construction is not restricted by season and weather, and can be used for various projects, including maintenance, emergency repair and drinking water projects. The comprehensive construction cost is low and the economic benefit is remarkable.
5、 Construction technology of chemical grouting for waterproof and leak stopping
High pressure chemical grouting plugging construction shall be carried out by the construction team with * * * trained personnel and * * * construction equipment.
1 Cleaning: carefully check and analyze the leakage, and determine the position and spacing of grouting holes. Clean the area to be constructed, chisel away the precipitates on the concrete surface, and ensure that the surface is clean and wet.
two drill hole : Using Electric hammer Such drilling tools shall be used to drill along both sides of the crack. The diameter of the drill bit is 14mm, the drilling angle should be ≤ 45 °, and the drilling * * * ≤ 2/3 of the structure thickness. The drilling must pass through the crack. However, it is not allowed to pierce the structure (except for the grouting behind the wall), and the spacing between the hole and the crack should be ≤ 1/2 of the structure thickness. The drilling spacing is 20cm~60cm
3 Buried nozzle: install grouting nozzle (also called water stop needle) in the drilled hole, and use*** inner hexagon spanner Tighten so that there is no gap and no water leakage between the grouting nozzle and the drilling hole.
4. Seam washing: high pressure Cleaning machine Inject clean water into the grouting nozzle at a pressure of 6 mpa, observe the water outlet, and clean the dust in the seam.
5 Joint sealing: seal the surface of the crack with quick drying cement when water seepage occurs during joint cleaning, so as to prevent the grout from running out during chemical grouting.
6 Grouting: use high-pressure grouting machine to inject chemical grouting materials into the grouting hole. The elevation grouting sequence is from bottom to top; The plane can be started from one end, and the single hole can be continuous one by one. When the adjacent holes begin to discharge grout, maintain the pressure for 3~5 minutes, then stop grouting of this hole and change grouting of adjacent grouting holes.
7 Nozzle removal: after grouting, the exposed grouting nozzle can be removed or knocked out after confirming no leakage. Clean up the solidified spilled grouting fluid.
8 Sealing: repair and seal the grouting opening with quick drying cement.
9 Waterproof: the chemical grouting part shall be coated with polyurethane waterproof material for three times (primer, intermediate and surface coating) for surface waterproof treatment.
