The republic. [volume] (Washington [D.C.]) 1849-1853, 1851-05-12
TO CONTRACTOR


OrrlcE THE COMMISSIONER OF PusLN BuILDINos,
WAsMNaroR, April -, 1851.
PROPOSALS will be received at this Office until
{ IL O'Clock, m. on the 10th day of May next
for constructing bridge across Tibcr creek, at it's
intersection with New Jersey avenue and street
north. The bridge, when finished, will be III feet
long. with An elliptic arch Of ~ feet span and 81
feet rise from its springing.
The Dit for the foundation must be sxcavated to
such depth superintendent ofthe work, TO be APP
pointed by the Commissioner, may direct. foun-
x o. n
centce, transversely to the axis Of the arch,
tending to tho back lines of the side walls. Three
rows Of sheet piling, three inches thick and five
ofthree Of the logs vix One in the centre and at
each end ofthe pit and quite and
to the logs; piece Of timber, 10 by ~ inches
square, wi then Dc nosched ono inch into sne trans
both Sides at the line cf the face Of the side walls,
the inner edge Of which 10 to be cbamfercd. and be
properly secured 70 the foundation tmbers; afoor-
ing three inches thick, OF Carolina Georgia pine,
will then be laid the whole surface Of the fcun
dation timbers. and secured to them by wrought
iron spike through each plank, into each log il may
cross and, in addition 10 this, tree nail Of oak
locust, II inches square and IA inches long. must
be driven into each log, through each plank, cx-
cept those under the side walls.
The side walls will probably be about ak feet
arch will then be laid eighteen inches deep, after
which the side walls will be carried up to its crown,
filing over the arch to its crown with solid mason
Of four feet. =
Parapet walls, IL inches thick and 8! feet high,
will then be carried up upon string course Of
cut granite 8 inches thick, the whole to be COPIED
with . good sandstone inches thick at the edges,
with saddle back Of two inches. Wing walls
will be laid SO far az may appear to be necessary,
the average thickness Of which will he q feet.
The arch and parapet walls will be Of the best
hard brick; all the other masonry will be Of large
size blue rock nciss, and the whole to be laid in
mortar made of lime, sharp sand and portion Of
hydraulic cement, except that the side walls, on
which the arch In 10 rest, must be laid for one foot
from the face and four feet HIGH in hydraulic &C.
rnent and suitable quantity Of sharp sand, with
out any quick lime.
manner and Of tho best materials, under the drcc-
ton Of the before mentioned superintendent, and
to be completed by the fret day OF September next
Persons proposing will state their price per cubic
yard for excavation Of the foundntion per 100 feet
board for the flooring and piles; per cubic
foot for the squared TIMBER per perch Of % cubic
feet for the stone masonry; per thousand for the
brick lad per 70 4 linenl for the granite string
COURSE and per foot ncal for the sandstone coping;
including all materials, centring, Golfer dams,
tools, &c. And no proposal will be considered
contract will be entered into. and bond with
security will be required for lie faithful perform
ancc Persons offering will, therefore, please to
give the names of their proposed suretics.
Tho Commissioner reserves the right Of reducing
the length Of the bridge to 30 feet.
Any further information can be obtained by APP
plying at this Office, where the plan may be seen
Commissioner of Public Buildings.