Estimating in Building Construction

104 CHAPTER TEN

EXAMPLE 10-11 REINFORCING DRILLED PIERS

Estimating the reinforcing in the drilled piers consists of counting
the number of vertical bars and determining their length. Since
there are three drilled piers, results will be multiplied by three to
determine the total.
From the pier detail on sheet S8.1, detail 9 in Appendix A, and
from Figure 10.23, there are four No. 5 vertical bars and No. 3 ties
that are horizontal at 12 inches on center.

Total length of ties (lf )17 ties3.7 ft per ties3 piers

Add 1 to convert to number of tiesUse 17

Number of vertical spaces 16 ¿ 0 – > 1 ¿ 0 – 16 spaces

Tie length (ft)3.7¿ per tie

Tie length (ft) 2 r 2  7 – >12 inches per foot

 18 – (2 2 – ) 14 –

Tie diameterPier diameterCoverage

Pier diameter 18 –

Horizontal barsNo. 3

Add 10 percent for lap and wasteUse 241 pounds

Total weight219 pounds

Total weight of bars (pounds)210 lf1.043 pounds per foot

Total quantity (lf )(62 lf8 lf)3 piers210 lf

Vertical dowels (lf ) 2 ¿ 0 – 4 dowels8 lf

Vertical bars15.5¿4 bars62 lf

Vertical bars (lf ) 15 ¿ 6 – 4 bars

Length of vertical bars 16 ¿(2 3 – ) 15 ¿ 6 –

Length of vertical barsPier length  Coverage

Vertical barsNo. 5

FIGURE 10.22.Reinforcing Steel Layout. 

FIGURE 10.23.Drilled Pier Detail.

Add 10 percent for lap and wasteUse 78 pounds 

Total weight71 pounds

Total weight of bars (pounds)189 lf0.376 pounds per foot

Total length of ties (lf )189 lf