![]() The downstream river flow should be diverted to avoid flooding. You will have a patch of dry riverbed between the two embankments. Visualize a river, and imagine pouring enough earth, rock, or both at two places spanning the full width of the river, thus blocking the entire water flow. Engineers use different materials and construction techniques to build cofferdams.Ī cofferdam is like an embankment. Large barriers require bracing or support, or else the walls may collapse due to the surrounding water pressure. The objective is to build a waterproof barrier for the demarcated area and pump out any remaining water to create a dry working zone. The Surrounding Water is RemovedĪ cofferdam is an enclosure used to dewater an area or zone. This drilled pile foundation type is more commonly chosen for good-bearing soil, especially when a rocky bed is unavailable. Hence, the bottom or end-bearing is broader and endures more pressure. Belled or Under-Reamed PileĪ belled pile is not a typical cylindrical or large cuboidal pillar, but instead, the base is bell-shaped. This means that it may have a greater load-bearing capacity. However, there is more support at the pile’s bottom and around the base. Also known as a socketed pier, the straight shaft with sidewall and the end-bearing pile is costlier to construct. This foundation type uses both sidewall shear support and end-bearing. Straight Shaft With Sidewall & End Bearing Pile Hence, the sidewall is used to provide shear support to the pile base. The base of the pile still needs a rock or good-bearing soil, but a hard and reliable bottom may not be desirably accessible. Straight Shaft With Sidewall Shear PileĪ drilled pile needs sidewall shear support when a bottom or end support is unavailable or unreliable. It is the simplest form of drilled pile foundation deemed stable and safe, and the construction cost is relatively less. ![]() The end bearing pile is firmly installed into the hard rock or soil. The straight shaft end-bearing pile foundation is suitable for rock, hardpan, and good bearing or firm soil.
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