Montgomery County sentinel. [volume] (Rockville, Md.) 1855-1974, 1860-09-21
Proposals for Building Bridge.

Proposals for Building Bridge.
OFFICE OF THE COMMISSIONERS
For MONTGOMERY COUNTY,
September, 18th, 1860.
SEALED PROPOSALS will be received at
- this Office, until TUESDA Y, the 16th dan
Of October merit, for building Bridge over Sene-
ca, at or near Chopper Mill, agreeably to the
specification marked No. l. or the specfca-
ton marked No. 2. Bids will be received for
either specification bidders will state which
plan they propose for
Specification No. 1.
Z Two abutments, Is feet long each at the bot
tom, battening TO l6 feet at top 4 feet thick
at botom, battening to 3 feet at the top; 8 feet
high above low water mark to rest on solid
foundation of large solid stone, sunk sufficient
y in the ground to prevent frost or water un-
dermining the same; 2 wing-wals, 2 feet
thick at bottom, battening to l6 inches at top;
Is feet in length, and averaging feet in height:
the abutments and winQ-was TO be built Of
good solid stone, with strong lime and sand
mortari stone work to be well pointed in with
the same material; bridge TO be &C feet between
the abutments, aud to be IA feet wide, or 2
feet in the clear; to be bnilt with one sill, or
each abutment Ia feet long, p by Is inches
square TO be confined by bars of iron worked
up through each abutment, Zone bar on each
abutment j 10 joists, IS feet long, s by II
inches square; Of the joists to be confined to
the sills by means of iron bolts, II inches SO.
with screws and taps; the ends Of the ioists
between the abutments to rest on the cap stills,
IA feet long, l6 inches square; to be supported
on queen posts II by l6 inches square; to
rest on mud sill, 20 feet long, 16 inches So !;
to be sunk in the earth sufficiently deep to pre-
vent frost or water undermining it braces,
from the outer ends Of the mud sills TO the
queen posts, at proper elevation, and to be
secured to the same by tenant and mortice
king posts, feet long and 10 inches square ;
Supporting beams, IA feet long and 10 in. So,
TO be confined to king posts by good iron
stirrups, with bolts and screws; braces of
sufficient length TO connect and support the
king posts to the ioists, from the ends of the
cap sills posts, feet long, 8 by 10 inches :;
one to be confined at each corner of the bridge
for the hand railing to rest on, the hand rail-
ing to run the entire length Of the bridge, and
to be inches square, the flooring to be not
less than two inches thick to be well spiked
to the joists; all the timbers to be Of good
white oak.
Specification No. 2.
Two abutments, l6 feet long each of stone,
laid in lime mortar, not exceeding four feet in
height, % feet broad at top, and feet Mt bot
tom, with sill on each l6 feet long, 10 by IL
inches square the bridge to be SO feet long,
from abutment TO abutment, and to be ID feet
wide, or IL feet in the clear to be supported
between the abutmeuts by wooden piers
the centre pier to rest on a mud SILL 28 feet
long; to be hewed on two sides, with face
not less than IL inches broad and IA inches
thick, and to be sunk under the bed of the
creek a sufficient depth to prevent frost and
water from undermining it, not less than 3
feet well secured by means of stone well
rammed in queen posts to be tenanted and
morticed in this sill, Ia feet long, IL by IA
inches square, braces from the ends Of the
mud sill TO the queen posts, at proper eleva-
ton, and secured to them by tenant aud NOR
ticei other brace extending from the lower
queen post, and well secured at the foot of
that post, and likewise to the mud sill, at that
point, and to extend from that queen post TO
| the upper queen post, at u proper elevation
| to insure strength; those three braces to be
~ feet long, IL inches square; the cap sill to
be IA feet long, and 10 by IA inches square !;
the other two piers to be of the following di-
mansions and plan: the mud sill Of each to
be "a feet long, to be hewed on two sides,
with face of not less than IL inches, ID
inches thick, and to besunk in the solid earth
!
from being undermined by frost or water; 2
queen posts to be tenanted and mortic ed into
each sill, and 10 be u inches square and ~
| feet long, with one brace on each side from
the ends Of the mud sill to the queen posts, at a
proper elevation, and secured to them by ten.
ant and mortice those braces to be 10 inches
square; the cap sill connecting the queen
posts IA feet long, 2by IA inches square Z
braces TO each OF the end piers, 10 inches
square, TO be connected to the queen posts by
tenants and mortices, and not more than Is
inches below the cap sills and to extend from
thence into the earth near the stone abutments
about - Feet long 10 king posts, feet long,
8 by 10 inches square; l6 joists, 35 feet long
s by ~ inches square; four Of the josts TO be
confined to the cap stills, by means of iron
bolts inches square, with screws and taps :
2 supporting beams, Ia feet long, 10 inches
square, 10 be secured TO the king posts in the
centre Of each span by good iron stirrups
with bolts and screws braces, Of sufficient
length TO connect and support the king posts at
the centre OF each span, and extend to the
ioists, near the cap sill posts, feet long, 8
inches square, one to he confined at each cor
ner Of the bridge for the hand railing to rest
on, the hand railing to run the entire length
Of the BRIDGE and to be inches square the
flooring not 10 be less than 2 inches thick. to
We Wei Hplheu uoWh 10 lne JOlstS all tne tlIn-
bers TO be Of good white oak.
In addition to the above, there will be re-
quired lG joists 10 feet long, by IL inches
square, for the purpose Of connecting the two
outer piers with the stone misunderstanding
the entire length Of the bridge SO feet. And
il is further 70 be understood that there is an
abundance Of stone on the spot that can be
used without charge from the proprietor.
One ofthe outer piers will rest or be sunk iu-
TO the solid breast Of the old mill dam, and one
Of the stone abutments on the top of the same
breast OF the old mill dam, the breast Of this
old mill dam, TO have dry wall Of stone
placed around il to prevent lis being injured
by treshets the other outer pier TO be sunk
into the solid earth, Tor stone now therc) few
feet from the bed Of the creek the stone abut-
ment on the east bank TO be erected on the top
Of the solid earth, nearly on level with the
public road.
The contractor will be required to give bond
with security, for the faithful performance Of
the work. The Bridge TO be completed within
30 days from the the 10th of October, $780,
Upon the completion Of the work, inspection
Of the Commissioners and their approval, the
money viii be levied at the time OF making
the annual levy for the year OF 1861.
URlAH FORREST, Clerk
sep 2l-td 10 Commissioners.
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