23-Sec 33 49 13 Storm Manholes.pdf
PDF 93 KB Posted
- Attached to
- 2201256.01 - Whistlestop Park
- Solicitation number
- US.160528
- Issued by
- Montgomery County, Pennsylvania
About this file
This specification document outlines the technical requirements for storm manhole installation as part of the Whistlestop Park project being conducted by Montgomery Township in Pennsylvania. The work encompasses the fabrication and installation of precast concrete manholes, concrete manhole bases, manhole steps, and manhole covers and frames. The project requires compliance with established standards including ASTM C478 for precast reinforced concrete manhole sections, AASHTO specifications for highway bridges, and Pennsylvania Department of Transportation Publication 408. Precast concrete manhole sections must be 5.5% plus 1% air-entrained cement concrete with minimum 24-inch access openings, and manhole frames and covers must be domestic cast iron castings conforming to ASTM A48, Class 30 or better, rated for AASHTO Highway Loading Class H-20 (16,000-pound wheel loading). Approved manufacturers for manhole structures include Atlantic Concrete Products, Inc., Monarch Precast Concrete Corporation, and Modern Concrete Septic Tank Company, while frames and covers must be supplied by Neenah Foundry Company, E.A. Quirin Machine Shop, Inc., East Jordan Iron Works, Inc., or Syracuse Castings Sales Corporation. Construction requires installation of precast bases on a minimum of six inches of coarse aggregate subbase, sealing of interior joints with non-shrink mortar, and backfilling only after examination by the Resident Project Representative. The Whistlestop Park project has a bid submission deadline of April 30, 2026 at 10:00 AM, and the successful bidder must provide Performance and Payment Bonds each in the amount of 100% of the contract amount and a Maintenance Bond equal to 15% of the contract award price.
The specification document does not contain pricing information, as it is a technical requirements section rather than a cost estimate or pricing schedule. All work is subject to the Pennsylvania Prevailing Wage Act (Act No. 442) and Pennsylvania Public Works Employment Verification (Act 127). A bid bond equal to 10% of the maximum amount bid is required at submission. Shop drawings must be submitted for manhole sections and precast bases, manhole frames and covers, and manhole steps in accordance with Section 01 33 00 prior to fabrication. The document references related work specified in other sections, including soil erosion and sediment control, concrete work for utilities, rock removal, excavation and backfill operations, pavement restoration, and finish grading and seeding. No set-asides, incumbent information, or specific funding sources are detailed within this specification section.
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Text version
STORM MANHOLES
33 49 13-1
SECTION 33 49 13
PART 1 - GENERAL
1.01 SECTION DESCRIPTION
A. The Work of this section includes:
1. Precast Concrete Manholes
2. Concrete Manhole Bases
3. Manhole Steps
4. Manhole Covers and Frames
1.02 RELATED SECTIONS:
A. Related Work Specified Elsewhere:
1. Section 01 57 13: Soil Erosion and Sediment Control
2. Section 03 30 53: Concrete Work for Utilities
3. Section 31 23 16.26: Rock Removal
4. Section 31 23 33: Excavation, Backfill & Compaction
5. Section 32 12 23: Restoration of Paved Surfaces
6. Section 32 93 00: Finish Grading Seeding and Sodding
7. Section 33 41 00: Storm Drain Pipe
1.03 QUALITY ASSURANCE
A. Reference Standards:
1. American Association of State Highway and Transportation Officials (AASHTO):
Standard Specifications for Highway Bridges
2. American Society for Testing and Materials (ASTM):
A48 Specification for Gray Iron Castings
A615 Specification for Deformed and Plain Billet-Steel Bars for Concrete Reinforcement
C270 Specifications for Mortar for Unit Masonry
C478 Specifications for Precast Reinforced Concrete Manhole Sections
D4101 Specification for Propylene Plastic Injection and Extrusion Materials
3. Pennsylvania Department of Transportation Publication 408 Specifications
33 49 13-2
B. Acceptable Manufacturer:
1. The storm manhole structure, and frame and cover shall be provided by a firm regularly engaged in the manufacture of such products of the types, materials and sizes required, whose products have been in satisfactory use in similar service for not less than five (5) years.
2. Storm manhole structures shall be provided by one of the following manufacturers or approved equal.
a. Atlantic Concrete Products, Inc.
b. Monarch Precast Concrete Corporation
c. Modern Concrete Septic Tank Company
3. Frames and covers shall be provided by one of the following manufacturers or approved equal.
a. Neenah Foundry Company
b. E.A. Quirin Machine Shop, Inc.
c. East Jordan Iron Works, Inc.
d. Syracuse Castings Sales Corporation
1.04 SUBMITTALS
A. Shop Drawings:
1. Submit detail shop drawings of the following items in accordance with Section 01 33 00:
• Manhole sections and precast bases
• Manhole frames and covers
• Manhole steps
PART 2 - PRODUCTS
2.01 BASIC MATERIALS
A. Coarse Aggregate Subbase:
1. PennDOT No. 2A or AASHTO No. 8 in accordance with Table C, Section 703.2, Publication 408 Specifications.
B. Masonry Mortar: ASTM C270, Type S.
C. Concrete: PennDOT Class A, Section 03 30 53
2.02 FABRICATED PRODUCTS
A. Precast Concrete Manhole Sections: ASTM C478
1. 5.5% + 1% air-entrained cement concrete.
2. Eccentric cone section (Type `A'), or top slab (Type `B'), minimum 24" access opening unless otherwise indicated.
33 49 13-3
3. Precast riser sections of length to suit.
4. Precast bases of a design similar to the precast riser sections.
B. Manhole Steps:
1. Forged aluminum alloy 6061-T6 with drop front and safe tread as manufactured by Alcoa (No. 16829) or approved equal; portion to be embedded in precast manhole wall shall be dipped in heavy bodied bituminous paint or else provided with plastic inserts; or
2. Steel reinforced copolymer polypropylene with serrated tread and end lugs. The copolymer polypropylene shall conform to ASTM D-4101 (PP200B33454Z02) propylene copolymers and shall completely encase a ½ inch deformed steel reinforcing bar which shall conform to ASTM A-615, Grade 60; manufactured by M.A.
Industries, Inc. (Model PS2-PF) or approved equal.
C. Manhole Frames and Covers:
1. Domestic cast iron castings: ASTM A 48, Class 30 or better; free of bubbles, sand and air holes, and other imperfections.
2. Heavy duty traffic, AASHTO Highway Loading Class H-20 (16,000# wheel loading).
3. Frame and cover dimensions shall conform to the dimensions shown on the Drawings.
4. Contact surfaces machined and matched.
5. All manhole covers shall have as non-slip pattern and shall be inscripted as shown on the Drawings with raised letters. Letters shall have a height and width of not less than two (2) inches.
6. All manhole covers shall have two (2) concealed pick holes [and two (2) lifting bars].
7. Manufactured by Syracuse Casting Sales Corporation.
Standard: Model #12554552 frame with #10396162 cover Watertight: Model #1030453 frame with #1204 cover or
Neenah Foundry Company
Standard: Model #R-1788-A Watertight: Model #R-1916-F
PART 3 - EXECUTION
3.01 EXCAVATION
A. Perform excavation to the line and grade shown on the Drawings and as specified in Section 31 23 33.
B. Location and depth of manholes as shown on the Drawings.
33 49 13-4
3.02 CONSTRUCTION
A. Construct manholes of precast concrete sections and of the type shown on the Drawings.
B. Install precast base on a minimum of six (6) inches of coarse aggregate subbase.
C. Form flow channels in manhole bases as shown on the Drawings. Slope channels uniformly from influent invert to effluent invert. Slope bench towards channel at 1 inch per foot.
Construct bends of the largest possible radius. Form channel sides and invert smooth and uniform; free of cracks, holes or protrusions.
D. Do not permit pipe to project more then 2" into the manhole.
E. Seal interior joints between precast concrete manhole sections with non-shrink mortar.
F. Install manhole sections with steps in proper vertical alignment.
G. Use precast concrete grade manhole rings to achieve elevation shown for frame and cover.
Do not adjust elevation more than one (1) foot with precast rings. Provide the exterior of the grade rings with a 1/2" thick coat of mortar.
H. Install manhole frames and covers.
1. Set top of frames at finished grade elevation or other elevation shown on the
Drawings.
2. Anchor manhole covers at four (4) locations as shown on the Drawings.
3. Seal joint between manhole frame and manhole with non-shrink mortar.
3.03 BACKFILLING
A. Backfill only after examination of the manhole by the Resident Project Representative.
B. Perform backfilling as specified in Section 31 23 33.
3.04 SITE RESTORATION WORK
A. Once the manholes and related storm sewer construction has been completed in an area, the following site restoration work shall be completed in accordance with the Drawings and as specified in the noted Sections:
1. Finish Grading Section 32 93 00
2. Topsoil and Seed Section 32 93 00
3. Pavement Restoration Section 32 12 23
B. Contractor shall stage site restoration work for a large project in accordance with the construction schedule approved by Engineer.
END OF SECTION
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