The Evolution of Vertical Lift Bridges
The Evolution of Vertical Lift Bridges
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In our eReader you can find the full English version of the book. Read The Evolution of Vertical Lift Bridges Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Evolution of Vertical Lift Bridges
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One of quite different design was erected in 1873 at Dublin to carry a line of railway over the Royal Canal entrance at Spencer Dock, on a skew of 25 degrees. It is described as weighing 14 tons, the bridge being balanced with counterweight consisting of tanks filled with water, the tanks when empty being one ton lighter than the bridge, and when loaded with two tons of water, one ton heavier. It could be raised by hand power to a height of 1% feet, which left room enough beneath for barges. Th...e width was 12 feet and the lattice girders were 40 feet long, though the water opening was only 14^ feet. It was the first bridge on the site, and has sinc^ been replaced.
After completing the Erie Canal in 1825, elevated fixed bridges similar to those in England and France, had been used, with ap- proach grades of 7 to 8 per cent. , the grades being afterwards reduced and lengthened, with slopes not exceeding 4 to 5 per cent. A few swing bridges with center piers were then tried but none of them were satisfactory.
What to read after The Evolution of Vertical Lift Bridges?
You can find similar books in the "Read Also" column, or choose other free books by H G Henry Grattan Tyrrell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
One of quite different design was erected in 1873 at Dublin to carry a line of railway over the Royal Canal entrance at Spencer Dock, on a skew of 25 degrees. It is described as weighing 14 tons, the bridge being balanced with counterweight consisting of tanks filled with water, the tanks when empty being one ton lighter than the bridge, and when loaded with two tons of water, one ton heavier. It could be raised by hand power to a height of 1% feet, which left room enough beneath for barges. Th...e width was 12 feet and the lattice girders were 40 feet long, though the water opening was only 14^ feet. It was the first bridge on the site, and has sinc^ been replaced.
After completing the Erie Canal in 1825, elevated fixed bridges similar to those in England and France, had been used, with ap- proach grades of 7 to 8 per cent. , the grades being afterwards reduced and lengthened, with slopes not exceeding 4 to 5 per cent. A few swing bridges with center piers were then tried but none of them were satisfactory.
What to read after The Evolution of Vertical Lift Bridges?
You can find similar books in the "Read Also" column, or choose other free books by H G Henry Grattan Tyrrell to read onlineMoreLess
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