Excavation is done with standard dirt augers or dig buckets.  A temporary steel casing is placed at the top of the shaft for safety and static head pressure. A mixture of water and polymers are placed into the shaft, and then excavation is continued while keeping the slurry level at the top of the shaft.  The slurry mixture holds the shaft open and keeps the material being excavated on the auger.  Reinforcing steel is placed into the shaft through the slurry. Concrete is then placed into the bottom of the shaft with a tremme pipe or a concrete pump.  The slurry fluid is forced up by the concrete and pumped off where it can be disposed of or recycled properly.

Taylor Ridge Drilled Foundations, Inc. Uses slurry method excavation on our drilling projects.  Slurry method excavation is a productive and economical alternative to temporary steel casing.  It is especially efficient in large diameter shafts when used with heaving soils, sandy soils, or soils with high water tables.  This method can be used with mineral based products, such as bentonite, or polymer based products.  Taylor Ridge prefers polymer-based products because they are recyclable, biodegradable, non-toxic, and do not take away from the skin friction of drilled shafts.

Slurry Method Excavation Caisson Drilling Services Helical Piers and Anchors