7 24. In order to save timber, and to avoid the difficulty ofkeeping out the bottom springs, it has been proposed by aFrench engineer, after driving the outer row, to dredge outthe area thus inclosed, and fill it up to a certain height withbeton. The cofferdam is then to be completed by driving… … 25. Concrete is a valuable material when applied in aproper manner, viz., in underground works where it is con-fined on all sides, and is, consequently, subjected to littlecross strain ; but it is not fit to be used above ground as asubstitute for masonry, and will not bear exposure to water. 26.…
Architecture · Building
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