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Process of injection grouting
The process of injection grouting involves various steps and each of them should be executed correctly with expert supervision. The complete process stepwise is given below.
Step 1- Drill the Ports on the Surface
Drill the holes or ports in the cracks at a regular interval. The distance between the two ports depends upon the types of cracks. The minimum diameter and depth of ports are 2.5cm and 5cm, respectively. For fine cracks, the distance between two ports ranges from 150 mm to 200 mm and the distance between ports in major cracks ranges between 300-400 mm. The spacing of ports is usually kept greater than the desired depth of grout penetration.
Step 2- Seal Cracks Between Ports
The crack between the ports should be filled with epoxy, polyester or cementitious materials. Give time to the seal to be hardened. If cracks pass through the structure, such as a wall, the surface seals and ports are applied on both sides.
Step 3- Clean Ports and Cracks
Before starting grouting it is very important to clean and flush the cracks and holes properly. This can be done manually with clean water by using a vacuum to clean the cracks. The cracks should besprinkle with water. It is very essential to clean it properly to establish a strong bond. Double-check the surface sealing and port system.
Step 4- Grouting the Hose Connection
For smaller grout pressure up to 350 kPa, a hand-held, cone-shaped fitting on the grout hose is sufficient. For larger grout pressures, short pipe nipples are connected into the holes to obtain grout hose connections. Fix the nipple or pipe in the holes and seal it with adhesive around such that it cannot move from its place.
Step 5- Injection Grouting on the cracks
Inject the grout material in the crack with the Grouting machine. It should be filled with pressure. Injection grouting required skilled labour. Consider the temperature on the site while processing.