$10-10.$ A steel$-$pipe pile is to be driven to an allowable load

$($design load$)$ of $35$ tons capacity by an MKT$-11$B$3$

double$-$acting steam hammer. The steel pipe has a

net cross$-$sectional area of $17\mathrm{.}12$ in$.{?}^2$ and a length of

$45ft.$ The Danish pile$-$driving formula is to be used

to control field installation of the piles. How many

blows per foot are required for the last foot of pen$-$

etration? Use a value of $E_h$ of $19\mathrm{.}15ft-$kips.

$10-11.$ Rework Problem $10-10$ using the Engineering$-$

News formula.