Laserfiche WebLink
<br /> l8ô <br /> OCCUPATIONAL SAFETY AND HEALTH 1926.652rdl <br /> STANDARDS AND INTERPRE'rA'1'10NS <br /> and installed so as to be effective to the materials excavated from the bel! footing. <br /> bottom of the excavation. <br /> ../ (e) Additional precautions by way of shoring (9) <br /> and bracing shall be taken to prevent slides (1) Minimum requirements for trench <br /> or cave-ins when excavations or trenches <br /> are made in locations adjacent to backfilled timbering shall be in accordance with <br /> excavations, or whpre excavations are sub- Table P-2. <br /> jected to vibrations from railroad or high- (2) Braces and diagonal shores in a wood <br /> way traffic, the operation of machinery, or <br /> any other source. shoring system shall not be subjected to <br /> compressive stress in excess of values <br /> (f) Employees entering bell-bottom pier given by the following formula: <br /> holes shall be protected by the installation S - 1300 - 20L <br /> of a removeable-type casing of sufficient <br /> strength to resist shifting of the surround. D <br /> ing earth. Such temporary protection shan Maximum ratio ~ - 50 <br /> be provided for the full depth of that part of <br /> each pier hole which is above the bell. A life- <br /> line, suitable for instant rescue and securely Where: <br /> fastened to a shoulder hamess, shan be L- Length,unsupported. in inches. <br /> worn by each employee entering the shafts. D - Least side of the timber in inches. <br /> This lifeline shall be individually manned S - Allowable stress in pounds per square <br /> and separate from any line used to remove inch of cross.section. <br /> ,..'1. ,. 1 <br /> APPROXIMATE ANGLE OF ftEPOSE <br /> r. 88.OP\Nt 01' Sloe8 . EXCAVATIONS <br /> ..... . a.w............ II '1- - - ¡¡ <br /> jã . <br /> _. '-1 In .u... ..... ... <br /> ....... ............. ! - J. <br /> Tile "'U"" ".... .~ ." !: 0 <br /> .' I! <br /> ..... .1""'It.""'" J~ ¡ ¡ <br /> Tree""" ~J- I; <br /> . .. <br /> If! <br /> ! ]4 <br /> 11 J <br /> II I 1 <br /> u <br /> ....... .......... <br /> 183 1926.8S2 (fable p. () <br /> Ir ' <br />