Different from ordinary anchor bolts, self-drilling anchor bolts are a main bolting solution for weak rock and unstable environment like the fracture zone and crustal deformation, especially when borehole caving-in occurs or extended anchor bolts are needed.
Usually the land surface of the earth is covered with loose, unconsolidated material such as soil, clay, silt, sand, gravel and boulders, which varies in depth from a few centimeters to hundreds of meters.
Maxdrill has developed drag bits to drill pilot holes since they produce cuttings that are easy for logging. Maxdrill’s drag bits are recommended to apply in soft conformations, such as, sand, clays and soft stone. They are usually used in the fields of water well, mining, geothermal projects, environmental and site investigation.
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