Tubular and Other Iron Girder Bridges: Particularly Describing the Britannia and Conway Tubular Bridges; with a Sketch of Iron Bridges and Illustrations of the Application of Malleable Iron to the Art of Bridge-building. With Wood EngravingsJohn Weale, 1850 - 132 من الصفحات |
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عبارات ومصطلحات مألوفة
18 inches 9 inches abutments Anglesea applied arch arch bridges bar iron beam bolted bottom plates breaking weight Britannia Bridge Britannia tower Britannia Tubular Bridges Caernarvon Caernarvonshire cast cast-iron girder centre chains cohesive power compression connected consists construction Conway cylinder deflection depth diagonal dimensions ditto engineer equal erected experiments Fairbairn feet 6 inches feet in length feet wide fixed flange force frames girder bridge horizontal hydraulic press inch thick inches wide invention joints lattice bridge lifting load longitudinal main tubes malleable iron masonry material Menai Menai Straits MENAI SUSPENSION BRIDGE metal patent Penmaen piers pontoons punching rails railway rectangular ribs rivets road roadway Robert Stephenson rollers scaffolding sectional area side plates span spandrils square inch Stephenson straits strength structure supported suspension bridge T-iron Telford timbers tons top and bottom trussed tubular girders upper vertical width wrought wrought-iron
مقاطع مشهورة
الصفحة 57 - Immediately on opening the suspension bridge for railway traffic, the undulations into which the roadway was thrown, by the inevitable unequal distribution of the weights of the train upon it, were such as to threaten the instant downfall of the whole structure.
الصفحة 51 - Mawr are of a bold and costly construction. The precipitous face of this mountain descends to the water's edge, forming a cliff of steep and rugged outline ; and Telford's work in forming his road at this point consisted of rock-cutting, over a length of 1 mile and 231 yards, and, in some parts, 30 feet in height. This is protected with high breast and retaining walls, having stone parapets laid in lime mortar. The roadway is formed of pavement bottoming and a coating of broken stone ; " so that...
الصفحة 84 - I am of opinion that the tubes should be made sufficiently strong to sustain not only their own weight, but in addition to that load, 2,000 tons equally distributed over the surface of the platform, a load ten times greater than they will ever be called upon to support.
الصفحة 12 - ... finery, and is my invention, and was never before used or put in practice by any other person or persons.
الصفحة 87 - But it has been mentioned before, that thin sheets of iron take a corrugated form with a much less pressure than would be required to tear them asunder ; and therefore the value of/, as obtained from the preceding experiments, is generally the resistance of the material to crushing, and would have been so in every instance if the plates on the bottom side (subjected to tension) had not been rendered weaker by riveting. The experiments made by myself were directed principally to two objects : —...
الصفحة 89 - Another object not far pursued, was to seek for the proper proportion of metal in the top and bottom of the tube. Much more is required in this direction. In the three series of experiments made, the tubes were rectangular, and the dimensions and other values are given below : — The tube placed first in each series, is intended to be proportional in every leading dimension, as distance between supports, breadth, depth, and thickness of metal, — and any variations are allowed for in the computation....
الصفحة 82 - It has invariably been observed, that in almost every experiment the tubes gave evidence of weakness in their powers of resistance on. the top side, to the forces tending to crush them. This was strongly exemplified in experiments 14, 15, 16, &c., marked on the drawings and the table. With tubes of a rectangular shape, having the top side about double the thickness of the bottom, and the sides only half the thickness of the bottom, or one-fourth the thickness of the top, nearly double the strength...
الصفحة 12 - ... of iron from coke fineries without pots. But the method and process invented and brought to perfection by me is to continue the loops in the same furnace, or to put them into another air furnace or furnaces, and to heat them to a white or welding heat, and then to shingle them under a forge-hammer, or by other machinery, into...
الصفحة 58 - ... by the erection of a complete wooden bridge, which took off a large proportion of the strain upon the chains. If the chains had been wholly removed, the substructure would have been more effective ; but as they were allowed to remain, with the view of assisting, they still...