Profile: Terrain Geotechnical Consultants Ltd specializes in providing engineering consulting services. Our self drilling micropiles use a hollow threadbar with a sacrificial drill bit which is drilled into the ground using grout as a flushing medium. This results in a grout body within the ground containing a high tensile steel bar. Corrosion is taken into account by typically over-specifying the bar with a sacrificial corrosion allowance and/or by the use of special coatings. We design embedded retaining walls for use as basement walls, temporary works support or as independent retaining structures.