Publication: Electrical Age
New York, NY, United States
Stell Tower for the Toronto-Niagara Power Company
THE annexed illustration shows an interesting steel tower recently made by the Canadian Foundry Company, Toronto, which, with 2800 similar ones, will carry the transmission line conveying power from the generating station at Niagara Falls to the distributing station in Toronto, Canada. The line will consist of four three-phase circuits, two circuits being carried by each line of towers.
The towers are constructed of galvanized steel angles, bolted together, with bracing similar to the usual design of wind-mill towers. They will be 46 feet high, with a base 14 feet by 12 feet. Lengthwise of the line each tower will have a uniform width of 14 feet from bottom to top, but crosswise the width of 12 feet at the bottom will dimish, the sides coming together at the top. A steel pipe forms a cross-bar, carrying three steel pins, on which insulators will be placed on vertical steel pipes, so that the conductors of each circuit form an equilateral triangle, with a horizontal base of 6 feet.
The towers will be sunk about 6 feet in the ground, each support resting on a cedar block and braced with other blocks, upon which the earth will be solidly rammed. Wherever the nature of the soil demands it a concrete foundation will be used. The towers will he bolted together in a horizontal position and will be raised to the proper vertical position by means of a derrick. The tower is designed to withstand a side strain of 10,000 pounds applied at the top.
The towers will he spaced 400 feet apart, and where unusual conditions exist special towers will be provided. At curves the towers will be placed at shorter intervals, and so constrticted that they will be equal to the strain without guys.
At the crossing of the Welland Canal towers of special height will he erected to allow the passage of vessels below the conductors, and the same will be done at the Hamilton Bay gap. %%The insulators will be of glazed brown porcelain, in three or four parts. The parts making up the insulator will be cemented together, and the complete insulator will be cemented to the steel pin. The insulator will be about 14 inches in diameter at the top of the umbrella, and about 14 inches high over all.