This section is from the "Architectural Iron And Steel, And Its Application In The Construction Of Buildings" book, by WM. H. Birkmire.. Also see Amazon: Architectural Iron And Steel, And Its Application In The Construction Of Buildings.
All ironwork cleaned of scales and dirt, and to receive one coat of best oxide of iron and pure linseed oil, and all pins, pin holes and machined surfaces to be coated with pure white lead and tallow before leaving the shop, and after erection to receive one additional coat of paint.
All holes in cast iron to be drilled; rivet holes to be drilled or punched.
All wrought-iron angle knees connecting the beams to be as long as the web of the framed beam, and wide enough on the web to contain as many bolts or rivets to resist shearing and bending strains, equal to one half the safe strength of framed beam.
Furnish for mason all necessary anchors for brickwork.
Furnish all necessary galvanized anchors, rods, bolts and clamps for terra-cotta work.
Furnish all bridle irons, anchors and straps for carpenter, and do all drilling and tapping into ironwork necessary to secure the woodwork.
All iron beams and girders resting on walls to have necessary anchors.
All light castings anchored and bracketed for a stiff and substantial support.
Furnish and set for the support of floors and roof girders, columns of the following dimensions:
The first-story columns to have ornamental capitals, moulded bands and bases. Columns for the other stories to have moulded caps and bases. All according to sectional and detail drawings.
The lowest columns to have base plates of sufficient bearing area to distribute the load, at 1000 lbs. per square inch, on the granite base stones, and to be the thickness of the columns, the ribs not less than an angle of 450, with flanges the thickness of column, and a rim on the outside of bottom of plate 1 1/2" above the thickness of the plate.
The base plates to be bedded or grouted in solid with pure Portland cement.
Columns of cast iron to have brackets, flanges and lugs the thickness of metal in shaft, but none less than 3/4" thick, and connected through the flanges with not less than four heavy bolts.
Columns of wrought iron to have wrought-iron brackets, flanges and knees for beams and girders, of the proper thickness and stiffness as specified for framed connections.
All columns to be turned off true and at right angles to their axis, as no shimming or wedging will be allowed.
The ends of all columns, where necessary, are to be cast with an additional thickness so that the inside diameters are of uniform sizes at the connections, with a plate, planed on both sides and the full size of the column flanges, to be placed between and bolted through plates and flanges.
Girders formed of two or more beams to have inserted between the webs, not more than five feet apart, cast iron separators to fit accurately the form of the beams, with two bolts for 12-inch beams and over, and one bolt for 10 1/2-inch beams and under.
The bearings of all beams, girders and lintels must be not less than 6 inches at each end. Spans of 20 feet and over to have bearings on the walls of not less than 10 inches; lintels over openings more than 5 feet wide to have one inch additional bearing for each additional foot of span.
Furnish and set over all windows in bearing walls and others, as shown, cast-iron lintels the full bed of wall to be supported. The webs at ends to be 4 inches high, and to have a rise of 1 1/2 inches to every foot of span; all over 16 inches bed to have two webs; or two or more lintels placed side by side.
All lintels (not carrying floor beams) not over 6 feet span to have 1-inch-thick flanges and webs, and over 6 feet to 8 feet 1 1/4 inches thick, and over 8 feet 1 1/2 inches thick.
All lintels in special cases to be good and sufficient.
The stairways are to be built of iron, with slate treads and platforms 1 1/4 inches thick from basement floor to top story, and with iron treads below basement and from top story to roof.
Outside strings to be of deck or I beams, with ornamental cast-iron step blocks.
If outside strings are cast iron, to be not less than œ of an inch at thinnest part and ornamented.
The risers to be of cast iron, ornamented both sides unless otherwise specified.
The wall strings to be of cast iron, with moulded edges top and bottom, and project from wall sufficient to receive any furring, plastering or wainscoting.
The railings to be made of wrought and cast iron, the level railings similar; the top bar prepared to receive wooden handrail under another contract.
All the stair work to be made according to detail drawings furnished by Architect.
The stairs which extend to roof to have a bulkhead made of 3 1/2" X 3 1/2" tee and angle iron, covered with galvanized crimped iron No. 16 gauge.
All other bulkheads as shown to be of the same material.
Where roofs of bulkheads are not enclosed with glass, rafters to be provided of tee or angle iron, placed twenty-five inches between centres, to receive the fire-proof blocks. A galvanized gutter and leader to be provided for carrying water from bulkhead roof to main roof.
[Note - Under this heading give an accurate description of all work required, according to the previous plates and descriptions, which will give the Iron Contractor all that is required for the completion of the work at shop and building.]
All the ironwork throughout to be set and connected in the very best manner. Furnish all scaffolding, all fascias, railings and other light work.