Tunneling
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In our eReader you can find the full English version of the book. Read Tunneling 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 Tunneling
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To quickly assess the difficulty of the text, read a short excerpt:
Bracers to strengthen the timbering and the roof of the excavation are inserted longitudi- HallPI.
Section C-D.
nally between the various posts FIG. 90. Temporary Timbering of the and transversally between the Roof in the American Method.
crown bars, Fig. 90. As a rule, only three or four of these radial structures are temporarily erected. A trench is excavated at the side of the part marked 3 in the figure to receive the wall plate which is a heavy timber laid on the floor parallel to the long...itudinal axis of the tunnel. On the wall plates are erected the arched timbersets com- posed of five or seven segments of hewn timbers so as to form a polygonal frame which is wedged 174 TUNNELING to the crown bars and which will support the arch of the roof. After one of these segmental timber sets is erected the tempo- rary radial structure is removed and the upper section 6f the tunnel is cleared of any obstruction as the pressures are trans- ferred to the wall plates, Fig. 91. The bench marked 4 in the figure is taken away and the vertical props inserted under the wall plates, Fig.
What to read after Tunneling?
You can find similar books in the "Read Also" column, or choose other free books by Charles Prelini to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Bracers to strengthen the timbering and the roof of the excavation are inserted longitudi- HallPI.
Section C-D.
nally between the various posts FIG. 90. Temporary Timbering of the and transversally between the Roof in the American Method.
crown bars, Fig. 90. As a rule, only three or four of these radial structures are temporarily erected. A trench is excavated at the side of the part marked 3 in the figure to receive the wall plate which is a heavy timber laid on the floor parallel to the long...itudinal axis of the tunnel. On the wall plates are erected the arched timbersets com- posed of five or seven segments of hewn timbers so as to form a polygonal frame which is wedged 174 TUNNELING to the crown bars and which will support the arch of the roof. After one of these segmental timber sets is erected the tempo- rary radial structure is removed and the upper section 6f the tunnel is cleared of any obstruction as the pressures are trans- ferred to the wall plates, Fig. 91. The bench marked 4 in the figure is taken away and the vertical props inserted under the wall plates, Fig.
What to read after Tunneling?
You can find similar books in the "Read Also" column, or choose other free books by Charles Prelini to read onlineMoreLess
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