rescue, securely fastened to a shoulder harness, and separated from any
line used to remove excavated materials. No person shall be lowered into a
drilled pier excavation prior to casing the shaft through the overburden.
1.8.3.2
Ventilation
Each drilled pier excavation shall be provided with a ventilating device of
sufficient capacity to assure a safe and healthy atmosphere before workmen
and inspectors are permitted to enter the drilled pier excavation and
during all work periods.
PART 2
PRODUCTS
2.1
CONCRETE WORK
**************************************************************************
NOTE: Include information for concrete work.
Correlate with Section 03300A CAST-IN-PLACE
STRUCTURAL CONCRETE for pertinent information or
include concrete specifications in this section.
**************************************************************************
Concrete work shall be in accordance with requirements of Section 03300A
CAST-IN-PLACE STRUCTURAL CONCRETE, as modified herein:
2.1.1
Coarse Aggregate
Maximum size of coarse aggregate shall be [_____].
2.1.2
Reinforcing Steel
Reinforcing steel shall conform to [ASTM A 615/A 615M] [ASTM A 996/A 996M]
Grade [_____]. Steel shall be welded into cages in accordance with AWS D1.4
and inserted securely in the caissons, in position and alignment, as
shown, [prior to concrete placement] [prior to the concrete reaching an
elevation of [_____] meters feet below the bottom elevation of the
reinforcement].
2.1.3
Strength
Concrete strength shall be [_____] MPa psi at 28 days.
Slump shall be from
[_____] to [_____] mm inches.
PART 3
EXECUTION
3.1
PREPARATION
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NOTE: Caissons selected for contract shall be based
on analysis of subsurface investigation and design
requirements. Complete installation information.
**************************************************************************
a.
Caissons shall be excavated to established depths and dimensions
shown. Bottoms of caissons shall be cleaned of loose or soft
material and leveled. Excavated material shall be disposed of in
accordance with Section 02300 EARTHWORK.
b.
In drilling caissons, the surrounding soil and the earth walls
SECTION 02466A
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