Oil based Injection Polyurethane Grouting PU Foam
Sinomaco Oil based Injection Polyurethane Grouting PU Foam is a kind of chemical grouting material that is formed by the reaction of complex polyol and polyisocyanate and has an isocyanide group at the end. It is widely used in underground buildings in urban construction, subways, tunnels, hydroelectric dams, oil and coal mining projects, and plays the role in reinforcement, waterproof, and plugging. When touching water, it immediately produces gas, and expands in volume and produces a foam,which is insoluble in water and has a certain strength. It not only can prevent water leakage, but is also more suitable for reinforcement.
Impermeability: The impermeability of the material is normally above 380KPa and much higher than the general waterproof material. The waterproof effect is obvious. Compression resistance: The compressive strength of the consolidation body in the standard sand is generally only between 4.9 and 19.6 MPa, which can play a good role in reinforcement.
The material can play a significant role in both dry and mixed cracks. It first sinks to the bottom of the crack under the high pressure of the pouring machine, and the rigid foam produced by the reaction with water slowly squeezes out the water little by little, which has waterproof reinforcing effect finally.
Large expansion rate and no shrinkage. 10-20 times foam can be formed normally when reacting with the water slurry, which can further enrich the gap and play a role in waterproof and plugging.
Because the slurry is a single component, it is easy to use, and the foaming and consolidation are fast. It can play an immediate role especially in the rescue.
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.