Santiago Market Hall

SANTIAGO MARKET - In placing before our readers the details of this work we feel that we are rendering a service to the profession generally. The details are from the hands of Mr Charles H. Driver, architect, of No. 15, Victoria-street, and that gentleman has carried out the work entrusted to him by Mr Woods in a perfectly satisfactory way. So complete were the details of the Santiago Market that the contractors were not for a day at a loss for information. On page 280 we give a diagonal section on the line D-D on the plane, thus making the set complete. We now come to the details of the main girders under the centre roof. The lower girder is 2ft. 3in. deep, with bottom flange 9 inches by 1.25 inches; the top flange of the same dimensions, the web 1 inch in thickness, with star perforations and foliated. These girders are cast in lengths of 16 feet, the two end pieces being each 8 feet long; the junctions are formed as shown in the drawings on page 280, and they are bolted together by 0.75 inch bolts, eight to each joint, and the joints are covered by the ornamental panels. The intermediate girder is 6 feet deep, and in length as the main girder, fastened to the upper and lower girders by 0.75 inch bolts with ornamental heads. The bolts at the junction to the columns arc 1 inch in diameter. These girders are fitted in ornamental cast iron gilt work, as shown in the illustration. The upper girder is 2ft. 3in. deep, with flanges 9 inches wide, and 1 inch thick, having moulded panels cast thereon, and in lengths of 8 feet 2 inches. The end sections are fitted to the columns as shown, and the sections of girders are joined by eleven 1.25 inch bolts; ornamental panels complete the whole. The upper part of the column forming the angle is formed with 1.25 inch metal, 14 inches square, and socketed to bracket shaft and to the angle box forming the junction of the upper girder and hip rafter. The cornice on the top of the upper girder is of 0.375 inch metal, in lengths of 8 feet, and will be fastened by 0.375 inch bolts. In the centre roof the ends of the girders form junctions with each other at the angles of the roof, the hip rafter and the upper part of the column with 1.25 inch metal, bolted together by 1.25 inch bolts. Four hip rafters, each 2 feet deep and 26 feet long, with bottom flange 10.5 inches wide, 1.25 inch thick; the top flange 10.5 inches 0.875 inches. Thick; the middle web 1.25 inches thick, moulded on both sides; the ends are formed to fit the junction of the upper girders at the one end, and the box girders under the dome at the other end. The hip rafters are fixed to the box girder by four 1.25 inch bolts. The sockets for the tie rods are cast on and bored out, the rods being fastened in with two 1.125 inch steel pins. The common rafters are 1 foot 10 inches deep, 21 feet long, with flanges 7 inches wide, 0.75 inches thick; the web also 0.75 inches, moulded on both sides. The lower ends of the rafters are formed so as to fix to the upper girder, with a 1 inch flange, and box at the upper end in 0.75 inch metal for fixing to box girder under the dome. These rafters are fixed with four 1 inch bolts in each. Pockets are cast on the back of the rafters, so as to receive the purlins. The intermediate and jack rafters are 1 foot 3 inches deep, and 21 feet and 11 feet long respectively, with 0.75 inch top and bottom flanges 7 inches in width. The jack rafter is fastened to the hip rafter by three1 inch bolts. The four box girders under the domes are 1 foot 10 inches deep, 12 inches wide, and 13 feet 9 inches long with 1 inch metal top, bottom, and. sides. These are bolted to the casting forming the angle junction of the hip and common rafters with four 1 inch bolts. The four angle junctions are constructed as shown in the details. The tie rods are 2in. in diameter swelled out to 3in. with screws on the ends. [Engineer 6 May 1870 page 278].

Reference           The Engineer 6 May 1870 page 278, illustration, page 280