. American engineer and railroad journal . ti minutesthe street had gone down 4 ft. The large body of rock settlingin the mud raised the surface of the marsh at a point aliout100 ft. north of the street, about 5 ft. high, and opened acrevice a foot wide. This was a natural consequence of thedisplacement of mud by the heavy fill of stone, but why overhalf of the filled street should slide bodily toward the north,at the same time, and where and when it would bring u]) wereperplexing questions. To ascertain the exact nature of theunderlying strata of the mar,sh, and solve at least one of thesepro
. American engineer and railroad journal . ti minutesthe street had gone down 4 ft. The large body of rock settlingin the mud raised the surface of the marsh at a point aliout100 ft. north of the street, about 5 ft. high, and opened acrevice a foot wide. This was a natural consequence of thedisplacement of mud by the heavy fill of stone, but why overhalf of the filled street should slide bodily toward the north,at the same time, and where and when it would bring u]) wereperplexing questions. To ascertain the exact nature of theunderlying strata of the mar,sh, and solve at least one of theseproblems, we caused soundings to be made in lines 96 ft. long,extending from south to north, at right angles to the pipe, bydriving a 4-in. iron bar into the grounil. The crust of themarsh was found to be fairly firm to a depth of 3 ft., consist-ing of a sort of marl. >At the northerly side of the street, after passing throughthe crust, the bar sank into 19 ft. of soft mud, and thenreached hard bottom. xVt the middle of the street the bar. SIDE VIEW g ^H^^E^^^?^^^^^^lvi5yS:Sf^a^5rSW»Si^5^^. END VIEW. SIDE VIEW. END VIEW. FIRST MANNEK OF LIFTING AND SUPPORTING PIPE. After taking up the slack on each chain, a man was detailedwith a wrench to each screw, and at a signal from the fore-man each man took one turn of the wrench, and the pipe wasgradually raiseil. As the main was raised from the marsh, agang of men was employed in blocking under it, to preventits falling in i-ase of the accidental breaking of any part of thelifting machinery, until finally, when it was raised to thedesired height, or about 3 ft. below the official grade of thestreet, the pipe was temporarily supported by house hundred and eight} of these frames, each 3+ ft. high,wore used in raising and supporting the ]iipc. The next stej) was the permanent support of the pipe pre-vious to the filling of the street. This was done by construct-ing a series of wooden trestles, 5 ft. wide at the top and 13 f
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
