In this technique, a circular gap is excavated up into the depth at which the soil will stand unsupported (about 0.5m for soft clay and 2m for stiff clay). Vertical boards often called laggings, are then set in posture throughout the excavated facial area and so are held tightly towards https://inspirationaljourney99987.isblog.net/the-smart-trick-of-pile-foundation-contractors-bd-that-no-one-is-discussing-47850531