Abstract
Noise from diesel pile hammer during piling work was measured under two different conditions. One is an specified experimental condition under which the hammer drives a steel pipe pile remaining at a constant length in the test field of operation and other is actual one under which the hammer drives the pile actually in construction field of various sites. Sound levels (A) and (C) were measured at a distance of 10m from the piling position by a sound level meter, and number of blows per minute were counted. Sound level measured under both conditions was given as a function of the energy output of the hammer, and the following empirical formula was obtained. Sound level (A)=83+5log_10 2WH dB (A) W: ram weight (kg) H: ram stroke (m)