[R.O. 2012 §510.230; CC 1979 §27-47; Ord. No. 3978 §§3 — 4, 8-18-1978]
A. Curbs
and gutters shall be combined construction of Class B concrete. The
minimum width of curbs and gutters shall be twenty-four (24) inches,
of which the curb shall be six (6) inches in width and the apron watercourse
or gutter shall be eighteen (18) inches in width. The height of the
back of the curb shall be twelve (12) inches. The top of the curb
shall be six (6) inches in width and the height shall stand six (6)
inches above the flow line of the gutter. This will leave six (6)
inches in thickness for the gutter apron or watercourse. Any other
type of guttering will not be permissible, unless recommended to the
City Council by the City Engineer.
B. These
specifications will hold true in any area except new subdivisions,
with the exception that the property owner must get a construction
permit from the City Clerk and that provisions must be made to assure
that the curb line will be in conformity with the existing curb line
and level of the street. All curbs and gutters installed are the property
of the property owners, and it is their responsibility to install
and maintain the same.
[R.O. 2012 §510.240; CC 1979 §27-48]
A. Additional
specifications for the construction of concrete curbs and gutters
shall be as follows:
1. Cement. All cement used in the concrete curbs and gutters
shall be of a good grade of standard Portland cement which will pass
the standard test specified by the State Highway Department for testing
materials. Any cement failing to meet the above test shall be removed
from the work and not used in any part thereof. The cement shall be
delivered at the work in the original packages and be protected so
as not to be damaged in any way before mixing.
2. Sand. The sand shall be a good grade of river sand or clean,
sharp, flint sand. All sand shall be sampled by the Superintendent
of the Department of Streets and Public Improvements, and only such
sand as receives his/her approval may be used in the work.
3. Chats. If mine chats are used, they shall be of a good
grade, free from sludge, mud or soapstone and subject to the approval
of the Superintendent of the Department of Streets and Public Improvements.
4. Crushed stone. Crushed stone shall be any good flint or
limestone, crushed so as to pass a one (1) inch screen and be rejected
over a quarter inch screen. All crushed stone must be free from sand,
dirt, sludge or other material which might be harmful to the concrete.
5. Forms. Forms shall be constructed of lumber two (2) inches
thick or of steel of equal strength, except on curves, where flexible
slips may be used. All surfaces coming in contact with the concrete
shall be smooth and cleaned and oiled before concrete is placed against
them. Faced boards for combination curb and gutter shall be beveled
as shown on the plans and held in place with suitable clamps of sufficient
number to prevent bulging.
6. Division. Division plates shall be one-eighth (1/8) inch
steel or other material, approved by the Superintendent of the Department
of Streets and Public Improvements, and shall conform exactly to the
cross section of concrete as shown on plans; except, that a small
lug, provided with a hole for a hook, shall project above the surface
of the concrete to aid in removing the plate. Plates shall be cleaned
and oiled prior to their use.
7. Subgrade. That portion of the ground surface directly beneath
the concrete shall be called the "subgrade." All
soft and spongy material in the subgrade shall be removed and replaced
with suitable material. Fills shall be compacted in layers not exceeding
six (6) inches in thickness. Spots previously compacted by traffic
shall be loosened to a depth of six (6) inches, and the whole subgrade
shall be compacted to a firm surface having, as nearly as possible,
uniform bearing power. The subgrade shall be damp, but not muddy,
when the concrete is placed upon it.
8. Drains. In poorly drained ground, where, in the opinion
of the Superintendent of the Department of Streets and Public Improvements,
drains may be necessary to save the concrete from damage by frost
action, drains of four (4) inch tile shall be laid in the lines and
grades given by the Superintendent of the Department of Streets and
Public Improvements.
9. Subbase. Where drains are impracticable and the soil is
heavy colloidal clay or adobe, a five (5) inch subbase of cinders,
gravel or other porous material approved by the Superintendent of
the Department of Streets and Public Improvements shall be constructed.
The subbase shall be tamped until the surface is firm and of uniform
bearing power.
10. Cross section. The concrete shall conform to the cross section
shown on the plans.
11. Length of sections. Curb, or combined curb and gutter, shall
be divided into sections eight (8) feet long. Where necessary for
closure, this length may be varied slightly, but no noticeably long
or short sections shall be used. Sections shall be separated by the
division plates specified herein, which plates shall be put in form
before the concrete is placed and kept perpendicular to the face and
top of the curb. Plates shall be withdrawn when the concrete has hardened
sufficiently to keep the edges from joining. Edges shall be rounded
to a radius of about one-half (½) inch.
12. Expansion joints. One-half (½) inch expansion joints
shall be made at one hundred (100) foot intervals and at the ends
of all curves, by placing the joint filler in the form before the
concrete is placed or by leaving spaces to be filled with asphalt.
Care shall be exercised to get expansion joints truly perpendicular
to the top and face of the curb. The filler must effect a complete
separation between adjacent sections of the curb.
13. Proportions. The concrete shall be mixed in the proportion
of one (1) part of cement to two (2) parts of fine aggregate and not
more than four (4) parts of coarse aggregate. Aggregates shall be
measured accurately in a manner approved by the Superintendent of
the Department of Streets and Public Improvements.
14. Mixing. The ingredients of the concrete shall be mixed until
each particle of the fine aggregate is coated with cement and each
particle of the coarse aggregate is coated with mortar. The mixer
used shall be of an approved batch type. Each batch shall be mixed
at least one (1) minute from the time all the materials, including
water, are in the drum until the beginning of the discharge. The consistency
of the concrete shall be such that no separation of the ingredients
takes place. No combination of dry and wet mixture will be allowed.
15. Placing. When mixed, the concrete shall be placed at once
in the forms, filling both the apron and curb with material of the
same consistency. The concrete shall then be tamped and spaded, until
a thin coat of mortar is against the forms in such a manner that no
coarse aggregate will show when the forms are removed. Whole sections
shall be constructed without interruption. Whenever mixing is suspended
for forty-five (45) minutes or longer, material in excess of a complete
section shall be wasted. No concrete shall be placed when the temperature
is below, or likely in the next twenty-four (24) hours to go below,
thirty-five degrees Fahrenheit (35°F).
16. Finishing. The concrete shall be struck off flush with the
top of the forms and be given a true, even finish with a wooden float
and brush, care being taken that none of the coarse aggregate is exposed.
Corners and edges shall be rounded with suitable tools to the shape
shown on the plans. When the concrete has hardened sufficiently, curb
face boards shall be removed and the curb face brushed with a calcimine
brush dipped in water. Other forms shall remain in form at least twenty-four
(24) hours.
17. Curing. Concrete shall be kept wet for seven (7) days, either
by sprinkling or covering with earth and sprinkling.
18. Protection. The contractor shall protect the concrete from
all damage by traffic or the elements by canvas covers, barricades,
fences, red-lights at night or such other means as may be necessary
and shall provide crossovers for pedestrians at all street crossings.
[R.O. 2012 §510.250; CC 1979 §27-49]
Each private driveway shall be paved back from the curbing in
the same manner as the gutters constructed in front of the property
to be served by the driveway, rising to the sidewalk level not less
than four (4) feet from the inside of the sidewalk. The upper surface
of the driveway from thence to the outside street line shall be made
to conform to the grade of the sidewalk and shall be paved with concrete.
[R.O. 2012 §510.260; CC 1979 §27-50]
Curbing shall be set to a true line and grade, with a slope
of one (1) inch to the foot from the perpendicular towards the walk,
the upper and outer edge thereof to be the true line and grade of
the curb. The upper edge of the concrete shall be beveled so that
the top of the curbing shall conform to the finished line of the walk.
The ends of the curbstones shall be dressed to lay to a quarter of
an inch joint for the full depth and thickness of the stone, and the
back of the curbing shall be tamped solidly with small stone and mine
tailings, so as to prevent the curb from settling from the true line
and grade.