# A single-acting steam hammer (Vulcan 08 model) is used to drive a 400 mm diameter and 20

## Question:

A single-acting steam hammer (Vulcan 08 model) is used to drive a 400 mm diameter and 20 m long precast concrete pile into the ground. The following data are recorded:

● Weight of ram = 35.6 kN

● Stroke (height of fall of the ram) = 1.0 m

● Maximum rated hammer energy = 35.6 kN?m

● Hammer efficiency = 0.8

● Coefficient of restitution = 0.4

● Weight of pile cap = 5 kN

● Number of blows recorded for the last 25 mm penetration = 6

● Unit weight of concrete = 24 kN/m^{3}

Determine the allowable load for the pile, with a factor of safety of 4, using the modified ENR formula.

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**Related Book For**

## Principles Of Foundation Engineering

**ISBN:** 9781337705028

9th Edition

**Authors:** Braja M. Das, Nagaratnam Sivakugan