The Pacific commercial advertiser. [volume] (Honolulu, Hawaiian Islands) 1885-1921, 1906-08-18
CONCRETE CORE WALL.

CONCRETE CORE WALL:
ito not consider that the concrete
core wall rs now constructed has a s,,f.
Aeieht Ease tor that kind of a bedrock,
ahd would recommend that trench ho
/ opened upon the mauka side four feet
"a width and tne face of the rock be
/ tHofaaghiy scaEbled off the seams
! oioeked ouJ and filed with cement
/ mortar made of one part rock dust and
| one part cement, and the bed of the
trench covered for a depth OF two
inches with 4 mortar composed of opa
! part cement, one part SAND and one
part rock dust Immediately after the
| mortar Is spread, layer of concrete
shall be placed on the same. The con
| crete TO be of the same proportions as
now used and carried up to a height of
eighteen inches, after which the re-
malnder of the trench may be filed
with good quality of puddled earth.
The posts IN the core wall should be put
at least four feet into the concrete
and planking two feet into the same.
SECTION OF DAM:
| would recommend that the form of
dam be made as shown on the accom-
panyIng cross section, with a rock I'LL
on the back side of the core wall. built
on slope of / to ], with a top width
of SIX feet. and an earth fill on the
front side of core wall ten feet wide
at the top and slope of 31s to is
feet IN width of the stone next to the
core wall, and ON the outer slope to be
hand-placed. The rock on the outer
slope to be kept slightly above the
level of the dump and about three feet
higher next to the core. The rock fill
must at all times be kept at least thee
feet higher than the earth fill and at no
time more than six feet above the
same.
The inside slope of the dam shall be
trimmed TO true slope line to within
twenty feet of the rim of the dam,
both the rock fill and the earth shall
be carried up as nearly on a level as
possible.
Care must be taken to keep the fine
silt as much as possible next to the
core wall
OUTLET PIPES:
After a careful consideration of the
existing conditions | have concluded
that the most economical plan to secure
safe permanent conduit. Is To
TAKE OUT THE WORK NOW CON
STRUCTED, up to and including the
valve tower and reconstruct them
about on the same line as the present
etfiuent pipe, one directly under the
other, as shown in the accompanying
cross-section. The wooden stave pipe
being considered in the sense of a
form for the concrete conduit The
concrete arch being ten -inches thick
at the top and twelve inches on the
sides, with a base FIVE feet in width |
ten inches below the bottom of the
tower pipe. would put in the two
rails longitudinally as before and ex-
banded metal around the top, down to
the center of the tower pipe on each |
side, and not less than four inches from |
the pipe. This four inches of concrete |
next to pipe, to be made in the ratio !
of one cement, two sand and three /
gravel. This work, properly done, will /
insure safe conduit.
The concrete shall be cut away over
the pipe at the connection beyond the |
old tower location to make good |
and substantial joint at connection be-
tween the new and old work.
The section between this new work /
and the core wall shall be cleared off |
mortar of one part cement and one /
part rock dust reinforced with ten
inches of concrete all the way around |
the section now in place. A concrete
collar eighteen inches in thickness and
not less than eight feet square on the
outside, Will be placed at this connee
ton between the old and new work and
two other collars twelve inches in
thickness and eight feet square on the
outside, will be placed equal distances
apart between the collar abovemen
toned and the upper end of the pipe.
Below the core wall, through the rock
ill, the pipes as completed, shall be
thoroughly cleaned off, the outside of
he concrete chiseled off, brushed and
happened and then plastered with a
cement mortar made of one part cement
20 one part rock dust, of one-half inch
and a concrete shell not less
han inches in thickness shall be
placed entirely around the same, made
n the proportions of one of cement,
.hree sand and three gravel. The in
Side of the pipes shall be made as
light as it is practical to make them.
Holes shall be bored into the sections
hat are hollow underneath and said
places grouted with liquid cement.
VALVE TOWER:
1 have thought seriously of leaving
Tut the valve tower entirely and put
ing in large valve at the upper end
# the pipe, but considering its adj
and the fact that much of the i
Material is on hand, | have concluded
o place it Immediately above the cut
If wall rs shown on the plans.
An excavation should be made down
o the 965 foot level and piles driven {
own to firm footing, and the con-
rete put in and reinforced as before1
p to the bottom of the tower at ele-
alton of 973.
/ think bay should be made in the
ront of the valve tower and eoncreted.
he washout pipe can be carried to the
PIPER end of this bay and connected
18th a screened opening in the bottom
see plan of inlet bay).
A forebay, with bottom width Of
our feet, can be extended to the 0
.ream bed The plan for the arrange Il
ent of the gates seems to be good ex-
epting that a change will be necessary
Co no Great -