Tunnel Shields And the Use of Compressed Air in Subaqueous Works
Tunnel Shields And the Use of Compressed Air in Subaqueous Works
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In our eReader you can find the full English version of the book. Read Tunnel Shields And the Use of Compressed Air in Subaqueous Works 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 Tunnel Shields And the Use of Compressed Air in Subaqueous Works
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The invert was put in immediately behind the shield on the area left bare as the shield advanced ; the side walls were carried up by another gang between the lead- ing centre and the next one, while a third set of men turned the arch under the overhanging tail of the shield.
This arrangement enabled the lower half of each successive centre to be fixed in advance of the upper portion, and consequently the lower ranis of the shield were made with shorter pistons than those in the upper part.
The ...masonry of the arch consisted of concrete blocks, and cement mortar mixed in the proportion of 350 kg. Of cement to 1 cubic metre of sand, or say 1 to 5 by weight nearly.
The average rate of progress was about 10 feet per day of twenty-four hours, and, compared with the rate of progress of the roof shield employed in the " extra muros " section ot the tunnel when the upper half only of the work was constructed at the rate of about 14 feet per day, must be regarded as very satisfactory.
In the working of the shield two occurrences are of interest.
What to read after Tunnel Shields And the Use of Compressed Air in Subaqueous Works?
You can find similar books in the "Read Also" column, or choose other free books by W C William Charles Copperthwaite to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The invert was put in immediately behind the shield on the area left bare as the shield advanced ; the side walls were carried up by another gang between the lead- ing centre and the next one, while a third set of men turned the arch under the overhanging tail of the shield.
This arrangement enabled the lower half of each successive centre to be fixed in advance of the upper portion, and consequently the lower ranis of the shield were made with shorter pistons than those in the upper part.
The ...masonry of the arch consisted of concrete blocks, and cement mortar mixed in the proportion of 350 kg. Of cement to 1 cubic metre of sand, or say 1 to 5 by weight nearly.
The average rate of progress was about 10 feet per day of twenty-four hours, and, compared with the rate of progress of the roof shield employed in the " extra muros " section ot the tunnel when the upper half only of the work was constructed at the rate of about 14 feet per day, must be regarded as very satisfactory.
In the working of the shield two occurrences are of interest.
What to read after Tunnel Shields And the Use of Compressed Air in Subaqueous Works?
You can find similar books in the "Read Also" column, or choose other free books by W C William Charles Copperthwaite to read onlineMoreLess
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