. The railroad and engineering journal . pier,they appeared to be in a bad condition, and in the course which is m. ( ft.) below the level of the JoignyDam, or about m. ( ft.) below low water mark. The piles were embedded in concrete, but no remains ofbraces nor of planks were found indicating the arrange-ment of any frame or bed in which this concrete couldhave been placed to set. It therefore seems probable thatwhen the bridge was built the engineers simply dredgedout the gravel around the piles in such a way as to laybare the chalk which forms the bed rock, and is 3 or 4 m
. The railroad and engineering journal . pier,they appeared to be in a bad condition, and in the course which is m. ( ft.) below the level of the JoignyDam, or about m. ( ft.) below low water mark. The piles were embedded in concrete, but no remains ofbraces nor of planks were found indicating the arrange-ment of any frame or bed in which this concrete couldhave been placed to set. It therefore seems probable thatwhen the bridge was built the engineers simply dredgedout the gravel around the piles in such a way as to laybare the chalk which forms the bed rock, and is 3 or 4 m.( or ft.) at least below the low-water mark, andafter the driving of the piles, beton was run into the holethus formed. They could then have placed upon the con-crete a small coffer dam in such a way as to enable themto pump out the inside, to set the piles, put in the concrete,build the frame and the platform, and finally build themasonry up to the level of the water. The axis of the bridge is somewhat oblique in relation to. f\ a«ij)
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
