The Saint Paul globe. (St. Paul, Minn.) 1896-1905, 1901-08-30

ana they shall be tied together at in
terVals OF not more than eight times
the depth of the beam. and all columns
OF Deams adjoining the outside walls
snal De properly anchored to said walls
at similar distances
between the wrought iron or steel floor
beams shall be placed brick arches
Springing from the lower flanpe of the
steel beams Said brick arches SHAH be
designed with a rise to safely carry the
imposed load, but never less than one
and one-quarter inches for each foot of
span between the beams, and they shall
have thickness Of not less than four
inches for spans of five feet or less and
eight inches for spans over five feet.
said arches shall be composed of good
hard brick, or hollow brick of ordinary
dimensions, laid to line on the centers
properly and solidly bonded, each longf-
tudinal line of brick breaking joints with
the adjoining lines in the same ring
and with the ring under it when more
than four-inch arch is used. The brick
shall be well set and the joints filed in
solid with cement mortar. The arches to
be be Wen grouted and properly keyed. Or
the space between the beams filed in
with hollow tile arches of hard burnt
clay or porous terra Gotta of uniform
density and hardness Of burn.
Skew-bacl1s shall be of such form and
section as to properly receive the thrust
arches shall be Of depth and
sectional area sufficient to carry
without straining the material beyond it's
safe working load. but said depth shall
not be less than one and hree-quarter
inches for each foot of span, not includ-
projecting below the under side of the
beams, if the soffits of the tile are
straight; but If said arches are segmental,
having rise of not less than one inch
for each foot span, the depth of the arch
shall not be less than six inches.
The joints shall be solidly filed with
cement mortar as required of common
brick arches. and the arches so construct
ed that the key block shall always fall
In the center portion. The shells and
webs of all end construction blocks shall
i abut one against ;another; or the spaces
between the beams may be filled with
arches of Portland cement concrete, seq
mental In form, and which shall have
a rise of not less than one and one-quar-
the beams
The concrete snail noa be less than
Iour inches In thickness at the crown of
the arch and shall be mixed in proper
lions required by Sec. Sc of this code.
These arches shall in all cases be rein
forced and protected on the under side
with corrugated or sheet steel, steel ribs
or metal In other form weighing not less
than one pound per square foot, and
having no openings larger than three
square feet Or between the beams may
be placed solid or hollow burnt
clay. stone, brick, or concrete
conerete or other fire proof com
position, and any of the said materials
may be used in combination with wire
cloth, expanded metal, wire strands, or
wrought iron or steel bars; but in any
such construction and as a precedent
condition to the same being used, tests
shall be made to the satisfaction of the
Commissioner of Public Works.
Filling of any kind between floor
beams which is likely to be injured by
frost during freezing weather, shall be
temporarily covered with suitable mate
rial for protection from freezing. On top
of any arch, Intel or other device which
does not extend to and form a horizontal
line with the top of the floor beams, Gin
der concrete or other suitable fire proof
material shall be placed to solidly fill ltp
floor beams, and shall be carried to the
under side of the wood floor boards. in
case such be used. Temporary centering
when used in placing fire proof systems
between floor beams, shall not be remOV-
ed within twenty-four hours, or until
such time as the mortar or material has
set. All fire proof floor systems shall be
of sufficient strength to safely carry the
load to be imposed thereon without
straining the material In any case beyond
its safe working load. The bottom hanges
of all wrought iron or rolled steel floor
and fiat roof beams, and all exposed por-
tons Of such beams below the abut-
ments of the floor arches shall be entirely
incased in hard-burnt clay porous terra
Gotta or other fire proof material allow
ed to be used for the filing between the
beams under the provisions Of this sec
ton. such incasing material to be prop
erly secured to the beams.
The exposed sides and bottom plates
or fanges of wrought iron or rolled steel
Orders supporting iron or steel floor
be ans. or supporting floor arches or
floors. shall be entirely encased in the
same manner.
Sec 40. IncasinG Interior Columns
All cast iron, wrought iron, or rolled
steel columns, including the Jugs and
any fire proof building or used to sup
pert any fire proof floor. shall be pro-
tected with not less than two inches of
fire proof material. securely applied The
similar supporting metal may project to
within 70 of an inch Of the surface of
ha fro TrOOfpp