In this technique, a round hole is excavated up to the depth at which the soil will stand unsupported (about 0.5m for tender clay and 2m for rigid clay). Vertical boards often known as laggings, are then set in posture round the excavated confront and so are held tightly towards https://shopping-trends99887.thenerdsblog.com/36386193/not-known-facts-about-pile-foundation-engineering-bangladesh