The republic. [volume] (Washington [D.C.]) 1849-1853, 1851-05-08
TO CONTRACTORS

OFFICE OF THE COMMISSIONER OF PusLss BUILDINGS,
WAsHlS0roH, April "a. 1851.
PROPOSALS will be received at this Office until
i IL o'clock, M, on the 10th day Of May next.
for constructing bridge Tibcr creek, at its
Intersection with New jersey avenue and D street
north. The bridge when finished. viii be l72 feet
long, with an elliptic arch Of "a feet span and 81
The pit for the foundation must be excavated 10
such depth superintendent Of work, 70 BIO APP
pointed by the Commissioner, may direct. A foun.
dation course Of zap pine logs, 10 by 10 inche.
square, will then be laid three feet from centre L
centre, transversely to the axis Of tho arch, OK.
| tending to the back lines of the side walls. Three
rows OF sheet piling, three inches thick and five
feet long will then Be driven the upstream sides
ofthrcc of the logs, viz One in the centre and one at
cnch end Of the pit, and quite and spiked
to the logs; piece Of timber, 10 by ~ inches
verse logs for tho whole distance Of tho culvert
both aides MT the line IF the face Of the side walls,
the inner edge Of which il 10 be chAmfered, and be
properly secured to the foundation timbers floor
ing three inches thick Of Carolina or Georgia pine,
will then be laid over the whole surface Of the run
dation timbcrs, and secured TO them by wrought
iron spike through zach plank into each log it may
cross. and, in addition to this, tree nail Of oak
locust, II inches square and IA inches long. must
be driven into each log, through each plank, ex-
cept those under the side walls.
The side walls will probably be about six feet
arch will then be laid eighteen inches deep, after
which the side walls will be carried to its
filing over the arch to its crown with solid mason
ry. The side walls will have an average thickness
Of four feet.
Parapet walls, Ii inches thick and 8. feet high,
will then be carried up upon a string course OF
cut granite inches thick, the whole to be COPIED
with a good sandstone inches thick at the edges,
with saddle back of two inches. Wing walls
will be laid 80 far as may appear TO be necessary
the average thickness of which will be o feet.
The arch and parapct walls will be of the best
hard brick; all the other masonry will be Of large
size blue rock gncss and the whole to be laid in
mortar made of lime, sharp sand, and portion OF
hydraulic cemont, except that the side walls, on
which the arch il TO rest, must be laid. for foot
from the face and four feet high. in hydraulic
ment and suitable quantity OF sharp sand, with
out any quick lime.
The whole Of this work is to be done in the best
manner. and of ae beet materials under the direc-
ton Of the before mentioned superintendent, and
to be completed by the frat day Of September next.
Persons proposing will state their price per cubic
yard for excavation Of the foundation; per 100 feet
board measure for the flooring and piles; per cubic
foot for the squared timber; per perch OF rs cubic
feet for the stone masonry; per thousand for the
course. and per foot nes for the sandstone coping
including all materials, centring, Golfer dams
toole, &c. And no proposal will be considered
which docs not fully conform to this require ncnt
contract will be entered into. and bond with
security will be required for ts faithful perform
ance. Persons offering will, therefore, please IL
give the names of their proposed suretics.
Tho Commissioner reserves the right Of reducing
the length of the bridge to 80 feet.
Any further information can be obtained by APP
plying at this office, where the plan may be seen.
Commissioner of Public Buildings.
An 2o--law3w