inside of the bell and the outside of the spigot shall be cleaned.
a.
Diaper Bands: Diaper bands shall consist of heavy cloth fabric to
hold grout in place at joints and shall be cut in lengths that
extend one-eighth of the circumference of pipe above the spring
line on one side of the pipe and up to the spring line on the
other side of the pipe. Longitudinal edges of fabric bands shall
be rolled and stitched around two pieces of wire. Width of fabric
bands shall be such that after fabric has been securely stitched
around both edges on wires, the wires will be uniformly spaced not
less than 200 mm 8 inches apart. Wires shall be cut into lengths
to pass around pipe with sufficient extra length for the ends to
be twisted at top of pipe to hold the band securely in place;
bands shall be accurately centered around lower portion of joint.
b.
Grout: Grout shall be poured between band and pipe from the high
side of band only, until grout rises to the top of band at the
spring line of pipe, or as nearly so as possible, on the opposite
side of pipe, to ensure a thorough sealing of joint around the
portion of pipe covered by the band. Silt, slush, water, or
polluted mortar grout forced up on the lower side shall be forced
out by pouring, and removed.
c.
Remainder of Joint: The remaining unfilled upper portion of the
joint shall be filled with mortar and a bead formed around the
outside of this upper portion of the joint with a sufficient
amount of additional mortar. The diaper shall be left in place.
Placing of this type of joint shall be kept at least five joints
behind actual laying of pipe. No backfilling around joints shall
be done until joints have been fully inspected and approved.
3.4.1.4
Cement-Mortar Tongue-and-Groove Joint
The first pipe shall be bedded carefully to the established gradeline with
the groove upstream. A shallow excavation shall be made underneath the
pipe at the joint and filled with mortar to provide a bed for the pipe.
The grooved end of the first pipe shall be thoroughly cleaned with a wet
brush, and a layer of soft mortar applied to the lower half of the groove.
The tongue of the second pipe shall be cleaned with a wet brush; while in
horizontal position, a layer of soft mortar shall be applied to the upper
half of the tongue. The tongue end of the second pipe shall be inserted in
the grooved end of the first pipe until mortar is squeezed out on interior
and exterior surfaces. Sufficient mortar shall be used to fill the joint
completely and to form a bead on the outside.
3.4.1.5
Cement-Mortar Diaper Joint for Tongue-and-Groove Pipe
The joint shall be of the type described for cement-mortar
tongue-and-groove joint in this paragraph, except that the shallow
excavation directly beneath the joint shall not be filled with mortar until
after a gauze or cheesecloth band dipped in cement mortar has been wrapped
around the outside of the joint. The cement-mortar bead at the joint shall
be at least 15 mm, 1/2 inch, thick and the width of the diaper band shall
be at least 200 mm 8 inches. The diaper shall be left in place. Placing
of this type of joint shall be kept at least five joints behind the actual
laying of the pipe. Backfilling around the joints shall not be done until
the joints have been fully inspected and approved.
SECTION 02630
Page 34
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