The Advantages of Waterproof Dowel Construction with Chemical Injection:
Water-soluble chemical polyurethane grout is a thin, single-component synthetic polymer polyurethane material in the form of a slurry, which has the characteristics of cross-linking reaction with water and foaming to form a multi-layered closed elastomer. When it is injected into the concrete crack structure at high pressure and expands until all gaps are filled (including 0.015 mm micro-slits invisible to the naked eye), when it encounters water (water injection), a large amount of carbon dioxide gas is released along with the crosslinking reaction, resulting in secondary osmotic pressure. High Pressure Thrust And Secondary Osmotic Pressure Push The Elastomer In Again And Fill All The Gaps To Achieve The Purpose Of Stopping The Leakage.
Parameter description:
Product name: high pressure perfusion device
Drive motor power: 1100W
Output pressure: 12000 PSI
New start: <8000PSI
Drive motor: 220V/900W/50Hz
Maximum particles: 0-2mm
Body weight: 6 kg
Reservoir volume: 2 liters
Construction plan of a high pressure perfusion machine:
Concrete construction concrete, stone cracks, cracks and pores are the main causes of damage to Iconcrete buildings. The leakage of crack spores is the biggest headache problem because the cracks in the concrete are completely irregular. Generally, the traditional method of plugging is to dig open cracks or water leaks to plug the surface, but the result is often that the area is blocked where it leaks again. Since water can move irregularly in the inner cracks of the concrete, it seeps from relatively weak parts.
Adoption of the chemical grouting method. It is the use of high-pressure mechanical force (high-pressure grouting machine) to inject chemical grouting materials into concrete cracks. When the slurry meets the water in the concrete cracks, it quickly spreads, emulsifies, expands and solidifies. The Depth Depends On The Width Of The Crack: The Wider The Crack, The Higher The Flow Velocity Of The Slurry, The Deeper It Penetrates Into The Crack And The Better The Grouting Effect. The initial swelling rate of water-soluble polyurethane can reach 100%. After the gel is formed, the initial swelling disappears, but it has good elasticity and becomes a stable elastomer similar to water-stop rubber. In this way, the solidified elastomer fills all cracks in the concrete and completely blocks the flow of water outside the concrete structure to fulfill the purpose of stopping water leaks.
Cracks larger than 0.2 mm are grouted with water-soluble polyurethane slurry; cracks smaller than 0.2 mm are sealed with epoxy resin (For dry joints: Sealed with modified epoxy resin base liquid; For wet joints: Water-soluble polyurethane grout can be used, and the modified epoxy resin base liquid is used to seal and reinforce after water-stopping and drying. The cracks that are difficult to grout are sealed with “plug-stopping” to stop the water and sealed with modified epoxy resin base liquid after drying, then decide whether to perform modified epoxy resin grouting.
Construction Technology of Waterproofing and Waterproofing by Chemical Injections:
High-Pressure Chemical Injection Tamping Should Be Performed by a Professionally Trained Construction Team Using Professional Construction Equipment.
1. cleaning: Check and analyze the leakage situation in detail and determine the position and spacing of the grouting holes. Clean the area to be built and remove the debris on the concrete surface to ensure that the surface is clean.
2. drilling: Use a drilling tool to drill the hole pressure relief holes. The diameter of the drill bit is 14 mm. The reaming angle should be = 45”. The reaming depth is 2/3 of the thickness of the structure. The reaming must go diagonally through the main leakage hole. However, it must not penetrate into the structure, as the dust in the larger holes of the moving water is washed away by itself. The slow penetration into the wall surface is the drilling of plumb holes in the seepage surface. Flush out the injection hole with a washing machine until the injection hole is clear, then you can proceed to the next step.
3. buried mouth: Observe the pressure of the main leak hole. If the water flow is not urgent and the pressure is not large, the quick-drying plugging agent can be used to bury the injection water stop needle. After the structure is stable, drill the wooden wedge again and install the expansion water stop needle). When the structure reaches a certain strength and there are no leaks, the other drain holes are each installed with expansion water stop needles and tightened with a special Allen key so that there is no gap between the joints.
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