Concrete construction about the home and on the farm

 
9781130843248: Concrete construction about the home and on the farm
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ... the steps, but 3 inches below the points where the inner edges of the treads meet the risers. Carry the outside form, however, on the same slope to the line of the top of the risers. Between the walls build a sloping platform out of 1-inch boards supported by 2 x 4-inch stuff, well braced and conforming to the slope of the walls. Upon this sloping platform place %-inch steel bars 12 inches apart running from top to bottom. Also, crossways place one 6-inch bar just at the foot of each rise, and fasten these to the J-incri bars by soft wire. Next mark for the location of the risers the side forms which project above the 8-inch walls, place cross plank on each to form these risers, and proceed in the same manner as has been described for area steps. Forms should not be removed from under the steps for 28 days. Should the steps be more than 6 feet wide, a wall similar to the two side walls may be built in the center. Sometimes it is easier to build a wall at the top and bottom of the steps instead of at the sides, and run the principal rods lengthwise of the flight, so that it is supported at top and bottom. In this case the supporting slab, whose thickness must be considered as the thinnest place in the steps, is designated in Fig. 21 by "A." The span, that is, the "distance apart of the beams," in the table is taken as the length of the horizontal projection of the stairs. The thickness of the slab and the diameter and spacing of the rods are given in the table following. Steps cast separate from supporting walls should be made in advance and allowed to season. The sectional drawing illustrates this form of step. To build a single step, make form shown in Fig. 22, 14 inches x 7 inches inside measurement and 1 inch for projection, and fill...

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