Van Nostrand's engineering magazine . 0 5 10 Abscissas— x=Energy of Blow in foot tons Formula y=~-^-350. Tons PILE-DRIVING FORMlL.!:. 391 Fig. 2. 100. Curves of extreme supporting powers of afir pileunder varying Energy of blow for different values of 20 30. 40 Foot Tons100 Tons 0 5 10 15 Abscissae-=x=Energy of Blowin foot tons. 25 Formula v = -^- ^— y p 500. 30 35 40 Foot Tons 392 VAN NOSTEANDS ENGINEEEING MAGAZINE. matter to ensure each pile being drivencorrectly, but on a large work such as theauthor is in charge of, where 15 steampile engines are in use and whe
Van Nostrand's engineering magazine . 0 5 10 Abscissas— x=Energy of Blow in foot tons Formula y=~-^-350. Tons PILE-DRIVING FORMlL.!:. 391 Fig. 2. 100. Curves of extreme supporting powers of afir pileunder varying Energy of blow for different values of 20 30. 40 Foot Tons100 Tons 0 5 10 15 Abscissae-=x=Energy of Blowin foot tons. 25 Formula v = -^- ^— y p 500. 30 35 40 Foot Tons 392 VAN NOSTEANDS ENGINEEEING MAGAZINE. matter to ensure each pile being drivencorrectly, but on a large work such as theauthor is in charge of, where 15 steampile engines are in use and where somethousands of piles have been driven, it iscertain that a large number will escapeinspection. Then again, here and there,a stick of timber may get driven of poorerquality than the surrounding piles, andafter a short time this pile may becomeuseless for supporting the superincum-bent structure. In the course of years it is probablethat data may be obtained, comparingactual dead weight resistances in differ-ent soils with the indications of sometheoretical formula, but there will still re-main the necessity for an arbitrary factorof safety which will in the judgment ofthe engineer suit the particular case inquestion. What considerations shoulddetermine the value of this fa
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
