Waterbased Injection Polyurethane (PU) Foam
Sinomaco Waterbased Injection Polyurethane (PU) Foam Grouting material is a new type of chemical grouting material containing isocyanate groups at the ends formed by the reaction of hydrophilic polyether polyol with isocyanate. It is widely used in underground buildings, subways, tunnels, hydroelectric dams, oil and coal mining projects in urban construction, and plays a role in reinforcement and anti-seepage and water shutoff, especially in blocking water and gushing water.
The product responds quickly to water, and produces CO2 gas at the same time, and gradually forms a water-tight consolidation body, so it can block strong water inrush and flowing water in the foundation.
The slurry generates CO2 gas by reacting with water can be further pressed into the pores of the porous formation by the pressure, which fully recharges the porous structure and makes it like cement concrete pores.
The slurry is hydrophilic, and the water is both a diluent and a curing agent. In the water-bearing formation, the penetration radius is large, the amount of water is large, the irrigation property is good, and the foundation has a strong binding force.
Because it is a single component, it is easy to use and the process is simple, which avoids the cumbersome phenomena such as the matching of acryl and epoxy grouting materials.
The slurry can adopt high-pressure grouting or manual grouting, especially high pressure grouting effect is ideal.
The leaking area is carefully checked to find the leak point (such as dry crack reinforcement can carry out water injection first, and then post-grouting) and remove the dirt around the crack.
Holes are cut crosswise on both sides of the leakage cracks. Spacing is 200-500mm. The leakage point can be more dense, the depth is generally more than 1/2 coagulation.
Needles of appropriate length are buried in well-punched places, and then the needles are tighten one by one, which allows the rubber parts to expand and lock the wall, until it does not shake when hand touching.
Grouting is injected into the needles one by one and from bottom to top to control the pressure. Generally it is greater than the groundwater pressure and lower than the bearing pressure of concrete. The other needle is replaced to continue grouting until seeing the adjacent crack at the white pulp,.
After the grouting is completed, a small hammer is used to gently knock and remove the needle protruding out of the coagulation so that the lower cement can be leveled.
For wet parts coated by cement, if there is any remaining leakage, further grouting is required to achieve “no wetness in a thousand times”.
When the grouting is finished, the grouting machine is cleaned with xylene or acetone, and the solvent is circulated in the machine for a period of time to ensure cleanness. Then oil is used to circulate in the machine for a period of time and properly maintained, which will extend the service life.
Waterproof plugging of deformation joints, construction joints and structural joints of buildings and underground concrete works.
Water leakage plugging and reinforcement of tunnel inner walls excavated in subways and tunnels, as well as reinforcement and stabilization of railway subgrade.
Seepage prevention and plugging of cracks in dam foundation in hydropower project.
Water blocking and reinforcement at the tunnel in oil drilling and retaining wall and coal mining to prevent deformation, cracking and collapse of foundations.