The republic. [volume] (Washington [D.C.]) 1849-1853, 1851-05-05
TO CONTRACTORS.
, AZ YIN AASAO O4AOe .lr
OFFICE OF THE COMMISSIONER OF PusLs BUILDING

OFFICE OF THE COMMISSIONER OF PULLS BUILDINGS
WAsHINGr0N, April ~, 1851.
PROPOSALS will be received at this Office until
L IL O'Clock, M, on the 10th day Of May next,
for constructing bridge Tibcr creek, at its
with New Jersey Avenue nn ID
long, with an elliptic arch Of "a feet span and 81
feet rise from its springing.
The pit for the foundation must be excavatod to
such depth superintendent ofthe work, to be APP
pointed by the Commissioner, may direct. A foun-
dation course of sap pine logs. 10 by Is inches
square, will then be laid three feet from oentre to
centre, transverseiy to the axis Of the arch; ex-
rows Of sheet piling, three inches thick and five
feet long, will then Be driven tho upstream sides
ofthree Of the logs viz One in the centre and ono at
each end ofthe PIT, and quite it, and
to tho logs; . piece of timber, 10 by IL inches
square, will then be notched inch into the trans
logs for the whole distance Of the culvert
both sides, At the line ef the face Of the side walls,
the inner edge of which 10 to be chamfered. and be
properly secured 70 the foundation tinbers; f1oor-
ing three inches thick, OF Carolina Georgia pine,
will then be laid the whole surface OF the foun-
iron spike through each plank. into each log it may
cross, and, in addition to this tree nail OF oak or
locust. Il inches square and IA inches long. must
be driven into each log, through each plank, OK
cept thoee under the side walls.
The side walls will probably be about ak feet
high from the floor to the spring Of the arch Tho
arch will then be laid eighteen inches deep, after
which the side walls will be carried up its crown,
filing over the arch to its crown with solid mason
~. The side walls will have an average thickness
Of four feet.
Parapet walls, ID inches thick and 81 feet high,
will then be carried up upon string course Of
cut granite inches thick, the whole 10 DO COPIED
with good sandstone inches thick at the cdges,
with saddle back of two inches. Wing walls
will be laid so far a. may appear to be necessary
the average thickness of which will DO q feet.
The arch and pnrapet walls will be of the best
hard brick; all the other masonry will be Of large
size blue rock or gness and the whole to be laid in
- ~~1-xs<~v IF
hydraulic cement, except that the side walls, on
which the arch ia to rest, must be laid for one foot
from the face and four feet high, in hydraulic CO.
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 the best materials, under the drec-
ton Of the before mentioned superintendent, and
to be completed by the first day of September next
Persons proposing will state their price per cubic
yard for excavation of the foundations; 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 tho
brick laid per foot lineal for the granite string
course and per foot neal for the sandstone coping
including all materials, centring, Golfer dams,
tools, &c. And no proposal will be considered
which docs not fully conform to this requirement.
contract will be entered into, and bond with
security will be required for its faithful perform
ance Persons offering will, therefore, please to
give the names of their proposed sureties.
The 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.