Richmond enquirer. [volume] (Richmond, Va.) 1815-1867, 1833-05-07
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vBNHE President of the United States having decided
~ ON the plan OF tho Bridge authorized TO be buift
across the Potomac River at the City of Washington,
Proposals. sealed and endorsed will be received by tho
Secretary OF the Treasury until the 10th of Nav incl
Sve Tor the materials and workmanship Of the same
ably to the terms and specifications OF the work
The Bridge will have 81 arches and draws AZ pieys
anu abutments with their half piers The arches n, no
30 feet span and % feet above the sprngin n and
70 90 curves oil several ceners semelpses The pi.
es aud abutments TO rise above low water and 10 he
sufficient breadth to sustain each the force of its depen
dent arch.
The draws be each 65 feet wide;one 70 be nIaced
az e Mary land, or ashngton channel the other at the
virginia channel The bridge be 80 feet wide between
he paapes and the carriage aud foot ways be horizon
"a, rom aounent TO aoutment The piers, arches and
aouehs 10 DC oil granite and TO be founded on piles
on the solid rock according nature of the bottom
The parapes TO be each lS inches thick and feet high
above the roadway The arches TO be 3 feet q incbss
ck at the Key and feet inches the springng line;
except the facing ring stones, the extrao. of which
VIII DC segment oil circle be described with the
creates radius OF curvature
The launches, 10 be filled i'm with good rubble mason
ry laid in mortar to height that shall be sufficient i'm adj
dnon to the weight of the dead-waug together with
that OF the parallel brick alls over the bscks Sc 10
lance or equaiberate the arches.
The road way to be nine inches thick, Macamized and
10 rest on Hat stones laid the brick spandrel walls
The loot ways TO be raised above the level OF thu carriage
way and logged The water to be carried of bv suii
cient drains and pipes the backs of the arches and
through the piers and abuments.
On the dead alng, over the piers FORMING tho r,cr
OF the pier-heads, pilasers of granite to be placed
The piers obe at least IL broad and 80 feet long at
the sprngng line and be 10 feet broad at low wa1er
The pier heads TO be truncated sem. cones cappedbe
upper radius feet inches, and the lower such that the
perhead shall batter in to more than feet below
low water.
The draw piers 10 be % feet broad at the sprineng
line and TO batter in the of all the other piers
except on the side OF the draw, which is be vertical
TO 6 feet below low water.
The piers at greater depth than 6 feet below low
water to batter in IL, and TO have sufficient osetts all
around them.
The abutments to have the thickness as the draw
piers exclusive OF the thickness of the half piers The
masonry oil the piers half piers abutmens to be
rough range work OF hard granite ovey large dimensions
iald In hydraulic cement The arch stones pilaster cor
Ioh anu Parape,s 10 be range work, rough hammered
The parallel walls the back of the arches and pers 10
be oil hard brick and together with all the other masonry
above the spngng line TO be laid in the best lime mortar
The timber to be used in the foundations TO be yellow
pine white oak.
The masonry of the piers and abutments TO be carried to
the depths indicated by the following table, which exh
bits also the depth Of the alluva deposit at distances of
Iloiset proceeding from the Washington abutment.