become necessary to interrupt placing concrete in any caisson.
Prior to placing additional concrete, surfaces shall be cleaned of
laitance and slush with one-to-one portland cement grout. The
grout shall have a water-cement ratio not exceeding that of the
concrete.
c.
Concrete in dry batter caissons shall be placed with a drop chute
extending within 1 m 3 feet of the concrete surface in the
excavation.
d.
Concrete shall be vibrated for [full height of caisson] [upper
[_____] meters feet of caisson]. Belled caissons shall be
vibrated full height.
3.3
TOLERANCES
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NOTE: Tolerances should be correlated with design
criteria and types of caisson.
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a.
Any caisson out of center or plumb beyond the tolerance specified
shall be corrected as necessary to comply with the tolerances and
the Contractor shall bear any cost of correction.
b.
Cross sections of shafts and bells shall not be less than design
dimensions.
c.
Caissons shall be installed with top location deviating a maximum
of [75] [_____] mm [3] [_____] inches from centerline locations.
d.
Vertical caissons shall be installed plumb within a maximum of 38
mm 1-1/2 inches for the first 3 m 10 feet and within 13 mm l/2 inch
for each 3 m 10 feet of additional depth.
e.
Batter caissons shall be installed a maximum of [2] [_____]
percent of length from specified inclination.
3.4
PENETRATION TESTS
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NOTE: Penetration tests should be included when
bearing investigations are determined to be a
contract requirement.
**************************************************************************
Penetration Tests shall conform to the following:
a.
After excavation, penetration tests in the bottoms of the
caissons, in [locations indicated] [[_____] caissons], to
determine bearing conditions, shall be made in accordance with
ASTM D 1586.
b.
The tests shall be made after caisson bottoms have been cleaned
out. Minimum blow count shall be [_____] per meter foot.
[Penetration tests shall be taken to a depth of [_____] meters feet
below the bearing elevation. The Contractor shall obtain and
retain jar samples, as directed by the Contracting Officer.]
SECTION 02466A
Page 12
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