Foundation Specifications 0185

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Pier columns are an extension of the pier to a planned elevation in bedrock material and

are usually the same size, or slightly larger, than the pier. They are ideally suited to canyons

or hillside areas where there are limitations on the usual footing foundations, i.e., the need

for approximately level topography and level underlying stratum. Footing foundations

constructed in steep slopes are very costly because of the tremendous amount of excavation

required. They are primarily a Cast-In-Drilled-Hole (CIDH) pile, except the means of

excavation is something other than the conventional drilling method.

The Special Provisions will contain a great deal of information regarding mined pier

columns and should be reviewed along with the contract plans and Standard

Specifications prior to the start of work.

Construction of pier columns is an excellent topic for the pre-construction conference,

especially in regard to safety and excavation plans.

Almost all pier columns will have neat line excavation limits specified on the contract

plans. Any excavation outside these neat lines shall be filled with concrete. The Contractor

should be reminded of this requirement prior to the start of work. It should also be pointed

out to the Contractor that care must be used in constructing the access road and/or work

area so that the excavation does not extend below the top of the neat line areas.