Post by ettingtonliam on Apr 16, 2019 16:55:56 GMT
Took me back to the 1970s and my involvement with the design and construction of Humber Bridge, which exceeded Golden Gate's record for the longest single span in the world, but wasn't as tall or as long overall. Other differences were/are that Humber has concrete towers instead of GG's steel ones, and has an aerofoil steel box deck instead of GG's lattice girder design. The method of spinning the cables looked identical. but I'm glad we had modern concrete batching plants and concrete pumps to replace those wheelbarrows!
There's also a similar film showing the construction of the Forth Road Bridge ( Mk. 1 as it were ) ---- the main appeal being that it was done entirely by an amateur film maker of the day........50 years later it was shown on the BBC and is worth seeing...
I was privileged to watch the construction of the first Severn bridge from my barrack room window at the Army Apprentice College Chepstow. I arrived at 15 years old in 1963, bad winter that, and the concrete anchors had just been installed. The two towers were quickly erected, and I remember sailing down the Bristol Channel in a 14 ft dayboat, and looking back to see the towers 'off the vertical',reflecting the curvature of the earth and also positioned to take the predicted load. The spinning of the overhead cables was fascinating, and took forever, and when they started winching up the aerodynamic deck sections - made up at a site upriver on the River Wye - the whole thing was quite magical. A fantastic example of British engineering. Where did that go...? I have never paid to go across it though... John
Galileo - Great mind. Newton - Genius mind. Einstein - Extraordinary mind Me - Never mind
John The curvature of the earth bit is negligible, but suspension bridge towers are pulled backwards by a carefully calculated amount before spinning the cables starts, so that when the cables are complete and the deck sections in place, the towers end up vertical. I've forgotten the figure for Humber now, but it was of the order of a metre or so.
sorry Gents-------don't know what else to suggest ?.......I've just tried again and once again have been successful.....I've lifted this from the opening sequence}-----------"60 minute documentary on the building of the Forth Road Bridge - Screened September 2014 BBC1 Scotland / BBC Four".
Maybe if you look on the BBC site it might be archived ??
PS}---- Give this a try}------- vimeo.com/channels/1010566
It's a Vimeo site for Sarah Howitt and you'll have to scroll down to the third entry....
Post by ettingtonliam on Apr 23, 2019 19:18:47 GMT
Yes, worked for me too. Thanks Alan for finding that. Some of those cranes of Howards we used on Humber in the 1970s, although they were pretty ancient by then, especially the ones with the wooden cabs. Recognised a couple of chaps I worked with, too.