by means of a vibrating plate mounted on a backhoe. The exact details for
the design of the contraction joints, as well as installation and methods
of maintaining tolerances, alignment, etc., shall be submitted in
accordance with paragraph SUBMITTALS. Plate alignment shall be controlled
by laser or other approved survey technique. Waterstops, drains, and
contraction joints within any conventional concrete shall be in accordance
with [Section [_____]] [_____] and as shown.
3.8
[GALLERY
**************************************************************************
NOTE: See the concrete materials DM for use of this
optional paragraph and to select the optional
methods.
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The gallery shall be constructed using one of the following schemes or
combination thereof, the details which shall be Contractor's responsibility:
a.
Precast gallery segments,
b. Removable rigid forms against which conventional concrete, or RCC
is placed, and
c. A noncementing fill as a temporary filler in the gallery area and
removing it to form the gallery after the RCC has gained sufficient
strength to be self-supporting.
Regardless of which procedure is used, the gallery shall be sloped to drain
and shall include a gutter along the downstream gallery wall as shown in
the drawings. In no case shall the gallery floor surface be allowed to
pond more than 25 mm 1 inch of water. The size and shape of the gallery
shall be as shown in the drawings.]
3.8.1
[Precast Gallery Segments
If stay-in-place precast gallery units are used to form the gallery, they
shall be constructed in accordance with [Section [_____]] [_____]. The
design shall be submitted for review and comment. The sections shall be
designed to carry the full load of the vibratory roller over the first lift
of fresh RCC above the ceiling section with a safety factor of 4 and shall
be designed to carry the vibrating load of subsequent compaction without
excessive deflection that could damage the previously placed RCC. For each
lift, a ribbon of bedding concrete, approximately 0.09 cubic meter per
linear meter 1 cubic foot per linear foot of precast panel, shall be placed
between the RCC and panels. The RCC bedding concrete interface shall be
thoroughly vibrated with immersion vibrators to eliminate any voids or
segregation within the RCC. A permanent reinforced precast slab may be
used to construct the gallery ceiling section in combination with other
gallery construction schemes chosen by the contractor.]
3.8.2
[Temporary Forms
The design of any temporary gallery form system and its adequacy shall be
the responsibility of the Contractor. Forms shall comply with the
requirements of [Section [_____]] [_____], except that they need not be
mortar-tight, and they shall meet the tolerances in paragraph CONSTRUCTION
TOLERANCES. The design of the ceiling form shall be such that it can
safely carry the load of the vibratory roller with a safety factor of 4 and
SECTION 03701
Page 56
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