structures, brick shall be laid radially with every sixth course a
stretcher course.
2.3.5
Precast Reinforced Concrete Manholes
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NOTE: Rubber-type gasket joints should be specified
only where watertightness is essential.
**************************************************************************
Precast reinforced concrete manholes shall conform to ASTM C 478M ASTM C 478.
Joints between precast concrete risers and tops shall be [full-bedded in
cement mortar and shall be smoothed to a uniform surface on both interior
and exterior of the structure] [made with flexible watertight, rubber-type
gaskets meeting the requirements of paragraph JOINTS].
2.3.6
Prefabricated Corrugated Metal Manholes
Manholes shall be of the type and design recommended by the manufacturer.
Manholes shall be complete with frames and cover, or frames and gratings.
2.3.7
Frame and Cover for Gratings
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NOTE: The likelihood of bicycle traffic should be
considered in the selection of the type of inlet
cover configuration.
**************************************************************************
Frame and cover for gratings shall be cast gray iron, ASTM A 48/A 48M,
Class 35B; cast ductile iron, ASTM A 536, Grade 65-45-12; or cast aluminum,
ASTM B 26/B 26M, Alloy 356.OT6. Weight, shape, size, and waterway openings
for grates and curb inlets shall be as indicated on the plans.
2.3.8
Joints
2.3.8.1
Flexible Watertight Joints
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NOTE: This paragraph covers compression-type
rubber-gasketed joints. When pipe requiring a
pressure-type joint is specified, the requirements
of this paragraph may not apply and the joint should
be made in accordance with the specifications for
the pipe.
**************************************************************************
a.
Materials: Flexible watertight joints shall be made with plastic
or rubber-type gaskets for concrete pipe and with
factory-fabricated resilient materials for clay pipe. The design
of joints and the physical requirements for plastic gaskets shall
conform to AASHTO M 198, and rubber-type gaskets shall conform to
ASTM C 443M ASTM C 443. Factory-fabricated resilient joint
materials shall conform to ASTM C 425. Gaskets shall have not
more than one factory-fabricated splice, except that two
factory-fabricated splices of the rubber-type gasket are permitted
if the nominal diameter of the pipe being gasketed exceeds 1.35 m
54 inches.
SECTION 02630
Page 25
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