conveying nonflammable substances in AREMA 1-5.
3.1.3
Concrete Work
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NOTE: Delete these paragraphs if not used or insert
applicable concrete requirements here.
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Cast-in-place concrete is included in Section [03300A CAST-IN-PLACE
STRUCTURAL CONCRETE] [03300N CAST-IN-PLACE CONCRETE] [03307 CONCRETE FOR
MINOR STRUCTURES]. The pipe shall be supported on a concrete cradle, or
encased in concrete where indicated or directed.
3.1.4
Manhole Construction
Construct base slab of cast-in-place concrete or use precast concrete base
sections. Make inverts in cast-in-place concrete and precast concrete
bases with a smooth-surfaced semi-circular bottom conforming to the inside
contour of the adjacent sewer sections. For changes in direction of the
sewer and entering branches into the manhole, make a circular curve in the
manhole invert of as large a radius as manhole size will permit. For
cast-in-place concrete construction, either pour bottom slabs and walls
integrally or key and bond walls to bottom slab. No parging will be
permitted on interior manhole walls. For precast concrete construction,
make joints between manhole sections with the gaskets specified for this
purpose; install in the manner specified for installing joints in concrete
piping. Parging will not be required for precast concrete manholes.
Cast-in-place concrete work shall be in accordance with the requirements
specified under paragraph entitled "Concrete Work" of this section. Make
joints between concrete manholes and pipes entering manholes with the
resilient connectors specified for this purpose; install in accordance with
the recommendations of the connector manufacturer. Where a new manhole is
constructed on an existing line, remove existing pipe as necessary to
construct the manhole. Cut existing pipe so that pipe ends are
approximately flush with the interior face of manhole wall, but not
protruding into the manhole. Use resilient connectors as previously
specified for pipe connectors to concrete manholes.
3.1.5
Miscellaneous Construction and Installation
3.1.5.1
Connecting to Existing Manholes
Pipe connections to existing manholes shall be made so that finish work
will conform as nearly as practicable to the applicable requirements
specified for new manholes, including all necessary concrete work, cutting,
and shaping. The connection shall be centered on the manhole. Holes for
the new pipe shall be of sufficient diameter to allow packing cement mortar
around the entire periphery of the pipe but no larger than 1.5 times the
diameter of the pipe. Cutting the manhole shall be done in a manner that
will cause the least damage to the walls.
3.1.5.2
Metal Work
a.
Workmanship and finish: Perform metal work so that workmanship
and finish will be equal to the best practice in modern structural
shops and foundries. Form iron to shape and size with sharp lines
and angles. Do shearing and punching so that clean true lines and
surfaces are produced. Make castings sound and free from warp,
SECTION 02531
Page 35
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