The Tower Bridge: Its History and Construction from the Date of the Earliest Project to the Present Time

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Office of "The Engineer", 1894 - Bridges - 106 pages
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Page 64 - ... with Admiral Sir George Nares, KCB", and Sir Charles Hartley, KCMG, on a commission ordered by Parliament to settle certain important matters connected with the river Ribble, and the same commission was reappointed in 1897 to report on further proposals connected with the same river. In December 1889 he was appointed by the Government on the Western (Scottish) Highlands and Islands Commission, a commission having objects similar to those of the Royal Commission on Irish Public Works. In 1894...
Page 18 - ... the side arches or openings available for the passage of vessels, some probably three or four of the tiers of ships and barges must be abolished. At present the maintenance of those tiers appears essential for the business of the adjoining wharves : not merely of those to the westward, but also of those to the eastward of the bridge. Whether the interests of the navigation do or do not outweigh the public requirements for bridge accommodation, would have to be considered after the wharfingers...
Page 64 - Blackfriars; and the Barry dock, near Cardiff, the largest single dock in the United Kingdom.
Page 18 - ... everyone interested in the traffic that ends and starts in the half-mile of river above the Tower would require compensation. Why not a low-level bridge with a swing section or sections? Because it would obstruct navigation in a way that a landsman would not perhaps think of. In order to pass the bridge, every ship coming up with the flood tide, or going down on the ebb, would have to be brought up head upon tide, made fast to a buoy, and then veered through the opening— a by no means easy...
Page 5 - ... communication between the Middlesex and Surrey banks of the river below London Bridge, followed by a general description of the bridge which has now been built. Detailed descriptions of the Foundations, Superstructure, and Hydraulic Machinery for opening the bridge have been added...
Page 43 - This class includes all bridges that can be raisedr turning round one or two horizontal axes or hinges. Their most ancient form was that of one flap of framed timber, used to cross the moat or ditch of a fortress or castle, and capable of being drawn up (hence the general term " drawbridge ") by chains from the inside, so as to render the ditch impassable, and form a barrier across the gate or entrance, for which purpose it was eminently suited. There is reason for believing that drawbridges were...
Page 64 - The maximum weight of kentledge added was 274 tons, in the case of a square caisson at the north pier, and the minimum was 86 tons for one of the angle caissons of the south pier.
Page 63 - The caissons enclose a rectangular space 34ft. by 124Jft., which was not excavated until the permanent work forming the outside portion of the pier had been built, both in the caissons and between them, up to a height of 4ft.
Page 58 - Each of the pumping engines has four steam cylinders of 38-in. stroke, two of which — high Fig. 77. — Section through Bascule and Pivot of Tower Bridge. pressure — are of 19-in. bore, and two for low pressure of 37-in. bore. Each of the two hydraulic pumps connected to each engine has a plunger 7^ in. diameter, with ЗУ-in, stroke.
Page 63 - London-clay, the reliable nature of which rendered it possible to effect a considerable saving by contracting the limits of the caissons within the outside line of the foundations; the full dimensions of the latter being attained by under-cutting beneath the caissons to the extent of 6 feet horizontally.

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