[Illustration: RAISING A FORTY INCH MAIN ON THE BOSTON WATER WORKS.]
The sketch below, reproduced from a photograph, shows the general method
adopted for lifting a 40 inch water main on Brookline Avenue, in Boston,
Mass. _Engineering News_ says:
The work, which was commenced in June, 1884, included the raising of
1,000 feet of this main from to 18 feet to adjust it to a new grade in
the avenue. The plan pursued by the Boston Water Department was about as
follows:
After the pipe was uncovered, piles were driven in pairs on each side, 5
feet 6 inches apart, and in bents 12 feet apart; the pile-heads were then
tenoned, and a cap made of two pieces of 4 by 12 in. stuff was bolted on
as shown, and the bents stayed longitudinally. The lifting was done with
the pipe empty, by screws 8 feet long, working in square nuts resting on
a broad iron plate on the cap pieces. After all preparatory work was
completed, the lifting of the pipe to its new position was accomplished
in about nine hours.
After the pipe was raised, two more 4 by 12 inch pieces were bolted to
the piles just under the pipe, and the bottoms of the piles were
cross-braced. Stringers made of two 6 by 12 inch timbers were then placed
on the caps, and a track of standard gauge put into place, upon which the
dump cars used in filling the avenue were run out.
The engineer in charge was Mr. Dexter Brackett, and we understand from
him that a 48 inch main is to be raised in a somewhat similar manner
during the present year.
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