. Economic Papers. CO/YCeETE:=fJ\ Cuyds pes- /in ft. of barrel = 03bi a^dsIn/ef End •<Outlet End-1 43 »fj Steelper Unit of barrel - 45 Ibi. of barrel - End -296 «Outfet End -5teef par tin. ft of -5-4- AS* CIECULAE. IZ b sq. Fh ith i forms. COUNTRY ROADS IN NORTH CAROLINA 39 twisted, or deformed bars may be used in place of these, provided thecross-sectional area of steel remains the same. Pipe Culverts: Several designs for solid concrete pipe are shownin Plate VI. In building these a collapsible metal form similar tothe one illustrated in
. Economic Papers. CO/YCeETE:=fJ\ Cuyds pes- /in ft. of barrel = 03bi a^dsIn/ef End •<Outlet End-1 43 »fj Steelper Unit of barrel - 45 Ibi. of barrel - End -296 «Outfet End -5teef par tin. ft of -5-4- AS* CIECULAE. IZ b sq. Fh ith i forms. COUNTRY ROADS IN NORTH CAROLINA 39 twisted, or deformed bars may be used in place of these, provided thecross-sectional area of steel remains the same. Pipe Culverts: Several designs for solid concrete pipe are shownin Plate VI. In building these a collapsible metal form similar tothe one illustrated in Plave IV is very convenient. The form for the half-round culvert should be made of No. 10 gaugesheet metal with a ljxlj angle riveted on the edges, rods withturnbuckles 4 feet apart serving to spring the form. A beveled 2x4wooden strip must be placed under each edge in order to strike the piece of Xo. 10 gauge sheet metal cut to fit the top of the form willserve for an end wall form. In building these culverts the bottom is put in level and allowedto set, being careful to have it true from end to end. The form is thenplaced and the c
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