What Does Bore Casing Mean?
Bore casing is a casing pipe inserted into a drilled bore to prevent it from collapsing. The casing is cemented to the borehole and aids in the drilling process. The size of the casing should be such that it will easily accommodate equipment needed to drill further. The most commonly used pipe casing material is polyvinyl chloride (PVC) because it is available in a variety of sizes and internal diameters depending on the requirement, and is cost effective. With the increasing use of trenchless technology for installing underground pipelines, casing plays an important role by way of stabilization of the borehole.
Trenchlesspedia Explains Bore Casing
Bore casing aids in the drilling process by helping in stabilizing the borehole, prevents contamination of freshwater in the vicinity, keeps the borehole aligned in the designed direction, and enables ease of access to drilling equipment for further drilling. Other materials such as steel, and fiberglass reinforced polyester (FRP) are also used as casing material. The casing is fixed to the borehole by inserting cement slurry into the annular space between the borehole and the casing. In horizontal auger boring (HAB) and microtunneling, the casing pipe is pushed into the bore using hydraulic jacks. In the process of pipe ramming an open ended steel casing is rammed into the soil and the dirt is removed from the entry point.