The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1910-12-07

) walls. constructed In places with |
out reinforcement, shall be the
full thickness prescribed In this
ordinance for brick walls. and
with steel or iron reinforcement. f,
they shall be at leas! slHty-slx
t6s) per cent. OF the thickness re-
quired for brick walls
Reinforcement shall not be
less than one -quarters n-b OF
one CD per cent; OF the area OF
the cross section I'm each direction.
such concrete shall be
5 thoroughly wet and properly
worked and all voids filled.
Exposed top surfaces shall be
thoroughly cleaned and dampened.
before adding the next succeeding
Sec. "a INSPECTION AND
, TESTS. All reinforced con-
crete construction shall be
sonal and constant super
8 vision OF competent super
|, intendcnt, who shall be SAT- sfao-
) tory TO the department OF build
= ings.
D Ii loading tests are considered
necessary by the department or
2 buildings the contractor must be
prepared within reasonable time
and At his own expense, to make
8 tests on panel or panels as may
be directed.
Such tests shall be made after
centering has been removed one
loaded over It's entire area with
uniformly distributed load equai
3 10 twice the superimposed load
for which the structure has been
designed and under such test kne
detection must not exceed one.
8 four-hundredth I-400) part or
the span and the member must re-
5 turn TO Its normal position after
"a 90 h.
0 The department OF buildings
| may require sworn copies OF tests
2 on all coments used In any rein
3 forced concrete work. such tests
10 have been made by one or the
s Standard Testing Laboratories,
o. The department OF buildings
Z may require special tests made OF
s any carload of cement or any por-
0 terial intended for reinforced con-
crete work. when the department
2 of buildings shall have reason 70
8 question the full strength or quail
4 ity OF such cement or other ma
s terial. All such tests shall DO
6 made at some acceptable Standard
Z Testing Laboratory, and at the ex.
3 pense Of the owner OF the cement
3 or other Raterls1 + : 70 r Is ssriaa OF
. CEMENT BRIoUETTs.. The min
& imum requirements for tensile
4 strength for briquetts. one Cd
b Inch square In sectioh. shah 10 -
6 follows:
Z For Neat Cement.
8 "a hours In moist DIR. 200 lbs:
y days Zone day In air. six In
0 water). 500 lbs; 20 days Zone day
In air. twenty-ssvsn In ~ater''
5 For One % Part Cement ond
4 Three CD Parts Standard Sand.
D days Gone day In air. SIX In
6 water). 175 lbs; % days zone DAY
In nj D..
" ARTICLE XIV.
Concrete Block Construction.
Section !: WHEE SE,o AaLo h Ia,
) ing blocks may be used Tor bniid-
4 ings four stories or less In height.
s where the blocks are approved oy
8 the Department OF Bu'laih nn.
8 part standard Portland cement TO
3 not more than three parts or clear
0 sharp sand and Ave parts or gravel
/ crushed rock or other suitaple ma
2 terial The materials used shall
3 be free from dirt and other foreign
! matter. properly mixed and manip-
> AS Sc. Of !; M MoEIDw s fRHfHS OF
3 BLOCKS USED FOR DIFFERENT
4 HEIGHT WALLS The hollow
s spaces of any block shall not eN.
6 coed the following percentages OF
4
s block for different heights OF walls
o and a. no case shall the thickness
o OF any web OF any block be less
! than one-,Guarter of the height OF
3 Stories LIST End. srd. Ath.
) ] AND AND I ssss ssss 4sqs .sss
Sec. 3. THICKNESS OF WALLS;
> building where concrete block. are
used, shall be the same as that re-
8 CURED for brick walls
Sec. FACING OF BLOCkS
to be Of concrete building blocks
and the backing OF brick, the con
3 crete blocks must be strongly bond
8 ed TO the brick with concrete or
brick headers, projecting four ca
8 inches into the brick work. every
8 fourth Cth) course being header
0 course. or bonded with metal wall
ties, spaced not to exceed eighteen
. t1S) inches In each direction.
Sec. s. MORTAR. All walls
2 where concrete blocks are used.
3 shall be laid up In Portland ce-
ment mortar, mixed with only sur
& ficent lime TO make the mortar elias
9 tic The cement shall be capable
z OF passing the minimum require
9 ments OF Portland cement. as set
0 forth In this Ordinance.
2 or BLOCKS. All concrete blocks.
8 before being used In the construc-
4 ton OF any building in the City OF
8 Detroit. must have attained the
age OF at least four ca weeks and
7 no blocks shall be used, which at
3 this age shall not have attained an
q average crushing strength OF hf-
0 teen hundred G.5o0) pounds per
! square inch. and minimum alb
3 eight (4s) hours OF complete i'm
4 mersion OF Ave (5) per cent, and In
3 no case to exceed seven CD per
4 cent Blocks cured In steam may
7 be used at the age OF three CD
8 weeks
Sec. 7. BEAM AND GIRDER
2 SUPPORTS. Wherever Orders.
: beams or joists rest upon walls 80
that there Is a concentrated load
& on the blocks OF over four thou
8 sand $4,000 pounds. these blocks
Z shall be made solid for at least
= twelve O2) inches below and eight
3 CD inches on either side or SAID
0 Orders, beams or Joists.
I Where such concentrated loads
2 exceed seventy-hve hundred G,500,
8 pounds the blocks shall be made
4 solid for at least twenty-four t2i)
s inches below and sixteen Cl6D
G inches on either side OF said cir
Z ders. beams or Joists.
Where the concentrated load ex-
Q cecds ten thousand 10000 pounds.
o the blocks shall be made solid for
! at least thirty-siN (36) inches be-
2 low aud twenty-four (2p Inches
3 on either side OF the glrders, beams
4 or joists. -...
Sec. 3. PIERS AND BUTTRESS-
. ES All piers and buttresses that
2 support loads in excess OF i've Coz
4 tons shall be built of solid con
3 crete blocks. from the foundation
6 up to the point OF application OF
= load
Concrete llntels and stills, shall
Q be reinforced by iron or steel rods
q In manner satisfactory to the
/ Department OF Buildings, and any
9 lintels spanning an opening over
z four ca feet SIX 90 inches In the
4 clear shall rest on sold concrete
3 blocks or solid wall.
Sec TESTS. No concrete
y hutiftnU hlocks shall he used I'm tho