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How to install the hollow shaft of a down-the-hole drill

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A drilled shaft is a deep foundation that is constructed by placing fluid concrete in a drilled hole, typically with reinforcing steel installed in the excavation prior to the placement of the concrete.

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Always centerpunch the hole locations before you drill; this will ensure that the holes are properly located (very important with bridge screws). If you don''t have direct access to a drill press,

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To construct a drilled shaft, drill a large hole into the ground, then fill it with concrete and reinforcing steel. You have the option to create a drilled

How to install the hollow shaft of a down-the-hole drill [PDF]

6 FAQs about [How to install the hollow shaft of a down-the-hole drill]

Can a drilled shaft be used as a shallow foundation?

The drilled shaft normally is used as a deep foundation, but it also can be used as a shallow foundation. Schematic of a typical drilled shaft. A drilled shaft is a deep foundation that is constructed by placing fluid concrete in a drilled hole. Reinforcing steel can be installed in the excavation, if desired, prior to placing the concrete.

How are drilled shafts installed?

Drilled shafts for structural support can be installed by the dry (open hole), stabilizing polymer slurry, or steel-cased methods. The permanent casing is typically only specified in corrosive environments, voided (open cavity) conditions, or for shafts drilled through the water.

How do drilled shafts work?

In principle, construction of drilled shafts is a very simple matter; a hole is drilled into the ground and concrete is placed into the hole. The practice is more complex:

What is a typical drilled shaft?

A schematic example of a typical drilled shaft is shown. The arrows indicate that drilled shafts can carry both axial and lateral loads. The drilled shaft commonly is constructed by employing rotary drilling equipment to bore a cylindrical hole.

How do I choose the best drilled shafts for my project?

Foundation Type Selection: The appropriate selection of drilled shafts for a particular project requires an understanding of construction in order to identify those conditions which favor the use of drilled shafts in lieu of alternative foundation types.

How is concrete placed into a drilled hole?

Concrete is placed into a drilled hole using a tremy pipe to prevent segregation, erosion of the hole's sides, and damage to the rebar. This method ensures proper concrete placement and the integrity of the drilled shaft.