HomeMy WebLinkAboutSection 16132 Precast ManholeSECTION 16132
PRECAST MANHOLES
PART 1 GENERAL
1.01 RELATED DOCUMENTS
A. All applicable provisions of Bidding and Contract Requirements
including Division 1 - General Requirements, shall govern the work
under this section.
1.02 WORK INCLUDED
A. Provide all labor, materials, necessary equipment and services to
complete the pre-cast manholes work," as indicated on the drawings, as
specified herein or both, except as for items specifically indicated as "NIC
ITEMS".
1.03 RELATED WORK
A. Section 02200 - Earthwork.
B. Section 15108 –Handhole and Boxes
1.04 SUBMITALS
A. Submit shop drawings and product data in accordance with Section
1300.
1.05 DESCRIPTION
A. Provide precast manholes include excavating and backfilling as necessary
for a complete installation in accordance with drawings and specifications.
1.06 QUALITY ASSURANCE
A. The work shall be performed in accordance with the drawings.
Earthwork shall be in accordance with Section, EXCAVATING,
TRENCHING AND BACKFILLING FOR UTILITIES in Division 2.
1.07 COORDINATION
A. Prior to beginning trenching operations, exact locations and clearances
for all pre-cast manholes shall be established. Adjust position of
underground utilities or adjust runs as necessary for proper location and
installation.
PART 2 PRODUCTS
2.01 ACCEPTABLE MANUFACTURER, MATERIALS AND COMPONENTS
A. Provide and install per-cast concrete manholes with covers as shown on
the drawings.
B. Manholes shall be as manufactured by the suppliers as shown on the
construction drawings .
C. Concrete
1. Plain and reinforced concrete used in structures, connections of
pipes with structures and the support of structures of frames shall
be 3,000 psi.
D. Frames and Covers
1. All frames and covers shall be of fabricated steel units. Stiffeners
used on covers shall transfer load directly to the frame.
2. All frames and covers shall be designed for H20 loading.
PART 3 EXECUTION
3.01 Excavation for Manholes
A. The Contractor shall do all excavation for manholes to the lines and
grades or elevations, shown on the plans, or as directed by the Engineer.
The excavation shall be of sufficient size to permit the placing of the full
width and length of the manholes as shown. The elevations as shown on
the plans, shall be considered as approximately only; and the Engineer
may order, in writing, changes in dimensions or elevations necessary to
secure a satisfactory foundation.
B. Boulders, logs, or any other objectionable material encountered in
excavation shall be removed. All rock or other hard foundation material
shall be cleaned of all loose material and cut to a firm surface either level,
stepped, or serrated, as directed by the Engineer. All seams or crevices
shall be cleaned out and grouted. All loose and disintegrated rock and
thin strata shall be removed. When concrete is to rest on a surface other
than rock, special care shall be taken not to disturb the bottom of the
excavation, and excavation to final grade shall not be made until just
before the manhole is to be placed.
C. The Contractor shall do all bracing, sheathing, or shoring necessary to
implement and protect the excavation and the manhole as required for
safety or conformance to governing laws. The cost of bracing, sheathing,
or shoring shall be included in the unit price bid for the structure.
D. Unless otherwise provided, bracing, sheathing, or shoring involved in the
construction of this item shall be removed by the Contractor after the
completion of the manhole. Removal shall be effected in a manner which
will not disturb or mar finished masonry. The cost of removal shall be
included in the unit price bid for the structure.
E. After each excavation is completed, the Contractor shall notify the
Engineer to that effect and the manhole shall be placed after the Engineer
has approved the depth of the excavation and the character of the
foundation material.
3.02 BACKFILLING
A. After installation of manhole has been completed, that area around it shall
be filled with approved material, in horizontal layers and compacted to the
density required. The top of the fill shall meet the elevation shown on the
plans or as directed by the Engineer.
END OF SECTION