. Railroad structures and estimates . than 40 ft. Use same sue,yond these proportions materially increases length and spacing of rods for all values of cost. 7. Where piles are necessary an approved 2. Use plain round rods for reinforcements. special plan sliall be used. 3. Place surface rods IJ in. from surface 8. Slope of culvert shall be not less thanof concrete. per cent- 4. concrete with the following formula: 0. Revel all square corners 1 in. 1 cement, 2J sand, .5 rrushcd rock (or gravel). 10. Where special conditions render dc-Iarticles of crushed rock or gravel shall no
. Railroad structures and estimates . than 40 ft. Use same sue,yond these proportions materially increases length and spacing of rods for all values of cost. 7. Where piles are necessary an approved 2. Use plain round rods for reinforcements. special plan sliall be used. 3. Place surface rods IJ in. from surface 8. Slope of culvert shall be not less thanof concrete. per cent- 4. concrete with the following formula: 0. Revel all square corners 1 in. 1 cement, 2J sand, .5 rrushcd rock (or gravel). 10. Where special conditions render dc-Iarticles of crushed rock or gravel shall not parture from the standard advisable the de-exceed 1 in. in any dimension. sired changes must be indicated in crayon a. Distance from l) of rail to top of on a lihie print and submitted to the Chief concrete shall be not less than 12 in. Knginecr Maintenance of Way for approval 0. For values of IV greater than 10 ft. prior to the commencement of work,increa-sc the thickness of top, bottom and II REINFORCED CONCRETE CULVERIX 151. 152 DIMENSIONS. SINGLE AND DOUBLE BOX CULVERTS. TABLE 72.— TABLE OF QUANTITIES AND DIMENSIONS FOR SINGLE ANDDOUBLE BOX CULVERTS. (Fig. 49.) Quantities .d Dimensions for Single and Doct;le Box Culverts for Values of W NOT Greater than 10 Ft. (See Note 6.) Height inside (feet)Clear span (feet) .... c « ^ IS Thickness (in.) Dia. of rods (in.) Spacing of rods (in.) Length of rods, single cul-vert Length of rods, double cul-vert Thickness (in.) Dia. of rods (in.)....Spacing of rods (in.).Length of rods Thickness (in.) Dia. of rods (in.). ...Spacing of rods (in.).I^ength of rods Shortest rod Dif. between rods (in.).Longest rod 310 7h6 2lllO 154 6 244 61 3 103 9 12 8 7 414 1 164 10 15 161 9 8 187 244 10 1 511 11 1 24 5 4 11 245 41 7 164 3 181 1223 1 13 1 24 5 10 13 2 24 5 10 1 10 164 6 2015 144 277 151 246 2 15 1 246 2 2 164 8 221 16 832 1 17 1 24 6 6 17 6 6 410 4 2710 7410 2 2010 16 4 10 4 7 Height inside (feet)Clear span (feet) .... C 7} Thickness (i
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