SECTION 02607

MANHOLES AND COVERS

PART	GENERAL

SECTION INCLUDES

Monolithic concrete manholes with [masonry] transition to lid frame, covers, anchorage and accessories.

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Modular precast concrete manhole sections with tongue-and-groove joints [with masonry transition to lid frame,] covers, anchorage and accessories.

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Monolithic FRP manholes with transition to lid frame, covers, anchorage and accessories.

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Masonry manhole sections with masonry transition to lid frame, covers, anchorage and accessories.

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

Section [______-____________]: Placement of fabricated steel items.

RELATED SECTIONS

Section 02222 - Excavating: Excavating for manholes and base pads.

Section 02223 - Backfilling: Backfilling after manhole installation.

Section 02781 - Site Grounding Systems.

Section 03300 - Cast-In-Place Concrete.

Section 03411 - Structural Precast Concrete.

Section 04100 - Mortar and Masonry Grout: Mortar and grout.

Section 06610 - Glass Fiber and Resin Fabrications.

Section 15430 - Plumbing Specialties: Manhole accessories.

Section 16118 - Ductbank: Manhole accessories.

UNIT PRICE - MEASUREMENT AND PAYMENT

Manhole:

Basis of Measurement: By the unit.

Basis of Payment: Includes excavating, concrete base pad, [concrete manhole sections,] [FRP manhole sections,] [brick masonry manhole construction,] [brick masonry transition to cover frame,] cover frame and cover, to [indicated depth] [design depth of [____] feet ([____] m)], forming and sealing pipe inlets and outlets.

REFERENCES

ANSI/ASTM C55 - Concrete Building Brick.

ASTM A48 - Gray Iron Castings.

ASTM C478 - Precast Reinforced Concrete Manhole Sections.

ASTM C923 - Resilient Connectors Between Reinforced Concrete Manhole Structures and Pipes.

ASTM D3753 - Glass Fiber-Reinforced Polyester Manholes.

International Masonry Industry All-Weather Council (IMIAC): Recommended Practices and Guide Specification for Cold Weather Masonry Construction.

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Shop Drawings: Indicate manholes locations, elevations, [piping,] [conduit,] [and] [________] sizes and elevations of penetrations.

Product Data: Provide manhole covers, component construction, features, configuration, dimensions [and] [________].

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing products specified in this section with minimum [three] [________] years [documented] experience.

ENVIRONMENTAL REQUIREMENTS

Maintain materials and surrounding air temperature to minimum 50 degrees F (10 degrees C) prior to, during, and 48 hours after completion of masonry work.

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Cold Weather Requirements: IMIAC - Recommended Practices and Specifications for Cold Weather Masonry Construction.

PART	PRODUCTS

MANUFACTURERS

[__________________________________] Product [_________].

[__________________________________] Product [_________].

[__________________________________] Product [_________].

Substitutions: Under provisions of Section [01600.] [________.]

MATERIALS

Manhole Sections: Reinforced precast concrete [as specified in Section [03410.] [________].] [in accordance with ASTM C478 with gaskets in accordance with ASTM C923.]

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Manhole Sections: Reinforced cast-in-place concrete [as specified in Section [03300.] [________.]

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Manhole Sections: Fiber reinforced plastic [as specified in Section [06610.] [________].] [in accordance with ASTM D3753.]

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Concrete Brick Units: [ANSI/ASTM C55, [Grade N, Type [I - Moisture Controlled] [II - Non-moisture Controlled]; [normal] [light] weight] [of same Grade, Type, and Weight as block units]; nominal modular size of [___x____x___] inches ([___x____x___] mm).] [As specified in Section [06610] [________].]

Mortar [and Grout]: As specified in Section [04100.] [________.]

Reinforcement: Formed steel wire, [____] gage ([____] mm) thick, [galvanized finish.] [unfinished.]

COMPONENTS

Lid and Frame: [ASTM A48, Class 30B] Cast iron construction, machined flat bearing surface, removable [lockable] [boltable] lid, [closed] [open checkerboard grille] [________] lid design; live load rating of [____] psf ([____] KPa); [sealing gasket;] [lid molded with [identifying] [________] name [and logo];] [________] manufactured by [____________].

Manhole Steps: [Formed [galvanized steel] [aluminum] [________] rungs; [3/4] [____] inch ([19] [____] mm) diameter.] [Formed integral with manhole sections.]

Base Pad: [Cast-in-place concrete of type specified in Section [03300] [________]] [________], leveled top surface.

Strap Anchors: Bent steel shape, [__x__] inch ([__x__] mm) size x [____] inch ([____] mm) thick, [galvanized to ASTM A123 [G90] [____]] [un-finished] finish.

CONFIGURATION

Shaft Construction: Concentric with [concentric] [eccentric] cone top section; lipped male/female [dry] joints; sleeve to receive [pipe] [conduit] [and] [________] sections.

Shape: [Cylindrical] [Square] [Rectangular] [________].

Clear Inside Dimensions: [[48] [____] inch ([1 200] [____] mm) diameter.] [As indicated.]

Design Depth: [[____] inch ([____] mm).] [As indicated.]

Clear Lid Opening: [[26] [____] inches ([660] [____] mm) diameter.] [As indicated.]

[Pipe] [and] [Conduit] Entry: Provide openings as [indicated] [required].

Steps: [[12] [____] inches ([300] [____] mm) wide, [16] [____] inches ([400] [____] mm) on center vertically, set into manhole wall.] [As indicated.]

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Steps: As required by code.

PART	EXECUTION

EXAMINATION

Verify items provided by other sections of Work are properly sized and located.

Verify that built-in items are in proper location, and ready for roughing into Work.

Verify excavation for manholes is correct.

PREPARATION

Coordinate placement of inlet and outlet pipe or duct sleeves required by other sections.

PLACING MANHOLE SECTIONS

Place base pad, trowel top surface level.

Place manhole sections plumb and level, trim to correct elevations, anchor to base pad.

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Form and place manhole cylinder plumb and level, to correct dimensions and elevations. As work progresses, built-in [fabricated metal items] [and] [________].

Cut and fit for [pipe] [conduit] [sleeves] [and] [________].

Grout base of shaft sections to achieve slope to exit piping. Trowel smooth. Contour as required.

Set cover frames and covers level without tipping, to correct elevations.

Coordinate with other sections of work to provide correct size, shape, and location.

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MASONRY CONSTRUCTION

Maintain masonry courses to uniform dimension. Form vertical and horizontal joints of uniform thickness.

Lay masonry units in [running] [________] bond. Course one unit and one mortar joint to equal [8] [____] inches ([200] [____] mm).

Form [concave] [flush] [________] mortar joints.

Lay masonry units in full bed of mortar, with full head joints, uniformly jointed with other work.

Install joint reinforcement [16] [____] inches ([400] [____] mm) o.c.

Place joint reinforcement in first [and second] [________] horizontal joints above base pad and below lid frame opening.

As work progresses, build-in [fabricated metal items] [and] [________].

Cut and fit for [pipe] [conduit] [sleeves] [and] [________].

Set cover frames and covers level without tipping, to correct elevations.

Grout base of shaft sections to achieve slope to exit piping. Trowel smooth. Contour as required.

Coordinate with other sections of work to provide correct size, shape, and location.

SCHEDULES

Storm Sewer Manholes: Precast concrete sections, galvanized steel steps, 48 inch inside dimension, to depth indicated, with bolted lid.

Electric Service Manholes: Prefabricated FRP sections, integral molded steps, 60 inch inside dimension, to depth indicated.

END OF SECTION