Chemical grouting is a process that's used in a very specific range of situations in the construction, tunneling and mining industries. The goal of chemical grouting is to pour a solution into the ground and cause the area to solidify into a single mass. In almost any situation where there are concerns about the ground being unstable, this method can be applied to provide a solid base or structure where it might otherwise be difficult or impossible to create one. It also can be utilized in efforts to control water seepage.
How It Works
The first order of business is to survey a location and determine whether it might be a candidate for chemical grouting. Data will need to be collected to determine where materials need to be injected, and a technician will drill holes at the locations where grouting needs to be done. Local soil pH levels will also have to be checked.
An epoxy material will then be injected through the holes to produce a solid mass at the desired depth. Monitoring and control of flow are critical during this stage of the process in order to avoid flushing out loose materials and creating a void and to prevent forming a heave by injecting too much epoxy. The entire solution will then need time to set.
Why Use Chemical Grouting?
In most industries, chemical grouting is primarily a risk-mitigation technique. If you're installing a new foundation at a location, for example, injecting a solid mass below the spot where the foundation will be added will reduce the chances the ground will sink under the weight of the building you're putting in. Companies also use it when the flow of underground water may create problems with a structure, allowing them to divert the water away from a building.
Although it might seem counterintuitive at first blush, excavation firms often use chemical grouting. This is because there can be stability concerns at certain sites where excavation is being performed. By employing chemical grouting at the location, a solid layer can be put in place below the point they intend to dig down to, permitting them to operate heavy equipment in the zone with greater confidence.
In some cases, it may also be used to protect underground pipes. For example, an area may have unstable soil, and that can be a threat to any sewer lines that might be installed there. For more information, contact a company like A-PAC Pressure Grouting Inc.