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Grafton Bridge, Auckland.

Designed and Constructed by Ferro-Concrete Company of Australia. This bridge is the largest concrete bridge in the world. It has been the subject ol much public discussion, both scientific and the reverse, i'or some years, and its completion has been looked forward to with much interest. From time to time we have published illustrations during the course of construction. To-day the completed structure ma,y be seen in the picture we publish. The bridge consists of one central span with two approaches, of which the western is of two spans of 35 feet, and four of 75, and the eastern is of three spans, two being of 83 feet and one of 42. The bearing plates for the girders are fixed on the piers, with ample room for expansion. The two main piers completing the approaches stand 100 feet, and are cylindrical, the walls being from 12in. to Bin. in thickness. On the top or head of the pier curved cantilever brackets carry the footpaths over the piers, and serve to embellish the pier heads. The piers are really built on three walls, and between the walls sit the abutments, being entirely independent of the piers. Into the abutment is fixed a thrust plate or steel grillage set to an angle normal through the line of thrust, aaid upon this plate rests a hinge supporting the whole arch. The arch span is 350 feet, and is three hinged. It consists, of two ribs ranging from six feet at the abutment to nine feet

the bridge is one in seventy-four, with a Kemuera, Epsom, Onehunga, etc., has taken total length of 9dO feet. two and a half years to construct and will _ me superstructure consists of T shaped be opened early in April, piers, this form being selected for its light- The whole construction is of reinforced ness; the longest pier is 80 feet, and the concrete throughout, and it is interesting whole is braced by two T shaped beams, to note that in the approaches is the longest

continuous reinforced girder extant, while the span is the longest so far constructed of reinforced concrete. The Dominion, therefore, once more heads the world. The work was done under the superintendeney of the Auckland City Engineer, Mr. Tush, and the cost (estimated) was £39.480. fl — mm n n ■ ■ rr n

most modern style, and with all the latest conveniences. It has electric light in every room, also electric belK Tlvre are five bathrooms, with lavatories, etc and independent showers, the whole supplied with hot and cold water. The reception rooms are decorated with ornamantel plaster ceilings and walls and panelled wood dados except

feet of Linotol flooring; nearly fourfold more in the following year; while in 1907 the total amounted to 691,000 square feet, the gross total for the seven years ending 1908 exceeding 2,000,000 square feet. The material is landed in New Zealand to the order of the New Zealand Linotol and Importing Co., and comes partly in bags as a

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Bibliographic details

Grafton Bridge, Auckland., Progress, Volume V, Issue 5, 1 March 1910

Word Count

Grafton Bridge, Auckland. Progress, Volume V, Issue 5, 1 March 1910

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