Deep Foundations

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Deep Foundations
Overview
Deep foundations may be used where new, heavily loaded structures are built, where poor bearing soils are present at shallow depth, existing shallow foundations are subject to increased loading, or structures are subject to uplift forces or seismic loading. Moretrench offers a variety of deep foundation options to meet project design and construction requirements including standard micropiles, hollow bar micropiles, auger cast piles, drilled displacement piles, drilled shafts, and helical piles.
Micropiles

Micropiles are small diameter, reinforced drilled-in piles capable of supporting design loads in excess of up to 400+ tons. Micropiles can be installed through almost any type of subsurface condition from sands to clay to bouldery soils to rock. Micropiling is installed accomplished using low-vibratory drilling techniques, a critical consideration when working around sensitive structures. The micropiles micropile elements can readily be installed in confined space and low headroom situations. Read more.

Drilled Shafts (Caissons)
Drilled shafts (caissons), drilled piers or bored piles, are often the deep foundations deep foundations of choice for buildings with high or concentrated column loads. Construction can be by the dry, wet or cased method, depending on the subsurface conditions and groundwater table elevation. Dry shaft construction, as the name implies, relies on the soil/rock to be self-supporting during excavation, reinforcement placement and concreting. Wet construction involves the use of a slurry to maintain hole stability during excavation and completion of the shaft element. Temporary casing is often used where the soils are dry, but their characteristics are such that caving or sloughing is anticipated during excavation, or where clean granular soils are present below the water table and the shaft must be seated into an impermeable layer to prevent water flow into the borehole. Read more.
Continuous Flight Auger (CFA) Piles
Under the right conditions, Continuous Flight Auger (CFA) piles, also commonly called Auger cast-in-place (ACIP) piles, offer a number of scheduling and economic advantages over other deep foundation options. Installation is rapid, vibration-free and can be accomplished in low headroom situations if required. CFA piles are constructed by rotating a continuous flight hollow stem auger into the ground to design depth and pumping high strength concrete through the hollow stem as the auger is slowly withdrawn. If required, reinforcing can be added while the grout is still fluid. Typical pile diameters range from 12 to 18 inches. Typical loads range from 10 to 150 tons. CFA piles should be considered where speed of installation is important, a large number of piles are required, and access is unrestricted. Read more.