DETAILS OF STEEL ERECTION. 



477 



Tin- safe load on piles may be calculated by the Engineering News formula 



p a 2W-h 



wlirrt- P safe load on the pile in tons; 

 W weight of hummrr in tons; 

 h height of free fall of hammer in ft.; 

 s average penetration of the pile for last six blows. 



(0 



Leads 



PJ/ S Hammer Lines 



'Rocker Front 



< ^Center 6eyr 



SPOOL ROLLER DRIVER 



ORDINARY TRACK PJLS DRIVER 



FIG. 26. TYPES OF PILE DRIVERS. 



I? 'Shears 



folts t unless otherwise noted- 



STANDARD 4B'O n 

 LAND PILE DRIVER 



American Bridge Co 



FIG. 27. DETAILS OF STANDARD PILE DRIVER. 

 AMERICAN BRIDGE COMPANY. 



