Question

Please develop at least five design notes to be provided in the construction drawing for cast-in-place reinforced concrete piles without permanent casing

Answer 1

Five design notes to be provided in the construction drawing for cast-in-place reinforced concrete piles without permanent casing are as follows :-

• The internal dia of the housing (casing) must not be less than the diameter of the specified pile and the straightness tolerance of any portion and of the entire length must be 1/100 of the length.
• The size and quality of the casing must be adequate to withstand all possible stresses to which it will be subjected during handling and construction, including preventing compression or grounding of the concrete inside the pile shaft and moving from each other.
• The casing will be manufactured in lengths that allow the casing to be extended if the ground conditions so require.
• Casing must be of uniform cross-section and without internal protrusions and with built-in concrete which can avoid the adequate formation of piles. The seals on the casing must be reasonably tight.
• If temporary casing is needed to stabilize the bore hole, it will extend beyond the unstable layers for a meter or more to prevent dirt and cavities from entering the surrounding soil.