SECTION 16118

DUCTBANK

PART	GENERAL

SECTION INCLUDES

Metal conduit.

Duct.

Manholes.

RELATED SECTIONS

Section 02222 - Excavation.

Section 02223 - Backfilling.

Section 02225 - Trenching.

Section 02607 - Manholes and Covers.

Section 02781 - Site Grounding.

Section 03100 - Concrete Formwork.

Section 03200 - Concrete Reinforcement.

Section 03300 - Cast-In-Place Concrete.

Section 07160 - Bituminous Dampproofing.

Section 15430 - Plumbing Specialties.

UNIT PRICE - MEASUREMENT AND PAYMENT

Duct Bank:

Basis of Measurement: By the lineal [foot] [meter], for each configuration.

Basis of Payment: Includes purchase, delivery, and installation of duct, fittings, supports, and accessories, and for trenching, concrete encasement, and backfill.

Manhole:

Basis of Measurement: Per unit.

Basis of Payment: Includes purchase, delivery, and installation of manhole.

REFERENCES

AASHTO - Standard Specification for Highway Bridges.

ANSI C80.1 - Rigid Steel Conduit, Zinc-Coated.

ANSI/ASTM A153 - Zinc Coating (Hot Dip) on Iron and Steel Hardware.

ANSI/ASTM A569 - Steel, Sheet and Strip, Carbon (0.15 Maximum Percent), Hot-Rolled, Commercial Quality.

ANSI/IEEE C2 - National Electrical Safety Code.

ANSI/NEMA FB 1 - Fittings, Cast Metal Boxes, and Conduit Bodies for Conduit and Cable Assemblies.

ANSI/NFPA 70 - National Electrical Code.

ASTM A48 - Gray Iron Castings.

ASTM A123 - Zinc (Hot-Galvanized) Coatings on Products Fabricated from Rolled, Pressed, and Forged Steel Shapes, Plates, Bars, and Strips.

NEMA TC 2 - Electrical Plastic Tubing (EPT) and Conduit (EPC-40 and EPC-80).

NEMA TC 3 - PVC Fittings for Use with Rigid PVC Conduit and Tubing.

NEMA TC 6 - PVC and ABS Plastic Utilities Duct for Underground Installation.

NEMA TC 8 - Extra-Strength PVC Plastic Utilities Duct for Underground Installation.

NEMA TC 9 - Fittings for ABS and PVC Plastic Utilities Duct for Underground Installation.

NEMA TC 10 - PVC and ABS Plastic Communications Duct and Fittings for Underground Installation.

NEMA TC 14 - Filament-Wound Reinforced Thermosetting Resin Conduit and Fittings.

SUBMITTALS

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

Shop Drawings: Indicate dimensions, reinforcement, size and locations of openings, and accessory locations for precast manholes.

Product Data: Provide for [metallic conduit] [, nonmetallic conduit] [[, manhole accessories] [, and] [__________________.]

Manufacturer's Instructions: Include instructions for storage, handling, protection, examination, preparation, and installation.

PROJECT RECORD DOCUMENTS

Submit under provisions of Section [01700.] [_____.]

Accurately record actual locations of exact routing of ductbank.

Accurately record actual locations of each manhole.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing Products specified in this Section with minimum [three] [_____] years [documented] experience.

REGULATORY REQUIREMENTS

Conform to requirements of [ANSI/NFPA 70.] [ANSI/IEEE C2.]

Furnish products listed and classified by [Underwriters Laboratories, Inc.] [testing firm acceptable to authority having jurisdiction] as suitable for purpose specified and shown.

FIELD SAMPLES

Provide under provisions of Section [01400.] [_____.]

Provide field sample of [plastic duct] [_____________], [two] [_____] each at [2] [_____ ] feet ([610] [_____] mm) long.

DELIVERY, STORAGE, AND HANDLING

Deliver, store, protect, and handle Products to site under provisions of Section [01600.] [_____.]

Accept conduit on site. Inspect for damage.

Protect conduit from corrosion and entrance of debris by storing above grade. Provide appropriate covering.

PROJECT CONDITIONS

Verify that field measurements are as shown on Drawings.

Verify routing and termination locations of duct bank prior to excavation for rough-in.

Verify locations of manholes prior to excavating for installation.

Duct bank routing is shown on Drawings in approximate locations unless dimensions are indicated. Route as required to complete duct system.

Manhole locations are shown on Drawings in approximate locations unless dimensions are indicated. Locate as required to complete ductbank system.

PART	PRODUCTS

RIGID METAL CONDUIT

Manufacturers:

[___________________________.]

[___________________________.]

[___________________________.]

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

Rigid Steel Conduit: ANSI C80.1.

Fittings: ANSI/NEMA FB 1; steel.

PLASTIC CONDUIT

Manufacturers:

[___________________________.]

[___________________________.]

[___________________________.]

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

Description: NEMA TC 2; Schedule [40] [80] PVC.

Fittings and Conduit Bodies: NEMA TC 3.

PLASTIC DUCT

Manufacturers:

[___________________________.]

[___________________________.]

[___________________________.]

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

Plastic Utilities Duct: [NEMA TC 6; [PVC] [ABS]] [NEMA TC 8; PVC] Type [EB.] [DB.]

Plastic Utility Duct Fittings: NEMA TC 9.

Plastic Communications Duct and Fittings: NEMA TC 10, Type [EB] [DB.]

REINFORCED RESIN CONDUIT

Manufacturers:

[_________________________] Model [_____.]

[_________________________] Model [_____.]

[_________________________] Model [_____.]

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

Conduit and Fittings: NEMA TC 14; Type [SW.] [HW.]

Joining Method: [Tapered bell and spigot joints.] [Threaded joints.] [Saw-cut system.]

PRECAST CONCRETE MANHOLES

Manufacturers:

[_________________________] Model [_____.]

[_________________________] Model [_____.]

[_________________________] Model [_____.]

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

Material: Reinforced precast concrete as specified in Section [03410.] [_____.]

Construction: Modular sections with tongue-and-groove joints.

Reinforcing: AASHTO Classification H-20.

Shape: [Square] [Rectangular [with truncated corners]] As indicated.]

Nominal Inside Dimensions: [_____ ] x [_____ ] feet ([_____] x [_____] m).

Corner Panel Dimensions: [_____] feet ([_____] m) wide.

Inside Depth: [_____ ] feet ([_____ ] m).

Wall Thickness: [_____] inches

Base Section: Include [3] [___] inch ([75] [___] mm) deep x [14] [__] inch ([350] [____] mm) round sump with cast sleeve, and two [1] [__] inch ([25] [__] mm) ground rod openings.

Top Section: Include [39] [___] inch ([1] [___] M) diameter grooved opening for frame and cover.

Riser Casting: [6] [12] inch ([150] [300] mm), with manhole step cast into frame.

Frames and Covers: ASTM A48; Class 30B gray cast iron, [27] [30] inch size, machine finished with flat bearing surfaces. Provide cover marked [ELECTRIC.] [TELEPHONE.] [____________.] [to indicate utility.]

Duct Entry Provisions: [Single duct knockouts.] [Window knockouts.] [Windows with plastic duct terminators and diaphragms.]

Duct Entry Locations: [[____] each end, [____] each side.] [As indicated.]

Duct Entry Size: [4] [6] [___] inch ([100] [150] [____] mm.)

Cable Pulling Irons: Use galvanized rod and hardware. Locate opposite each duct entry. Provide watertight seal.

Cable Rack Inserts: Minimum load rating of 800 pounds (365 kg). Locate at [_____] feet ([_____] m) on center.

Cable Rack Mounting Channel: [1-1/2 x 3/4] [____________] inch ([38 x 19] [______________] mm) steel channel, [48] [_____] inch ([1.2] [_____] mm) length. Provide cable rack arm mounting slots on [1-1/2] [____] inch ([38] [_____] mm) centers.

Cable Racks: [Steel channel, [1-1/2 x 3/4 x 14] [_____________] inches ([38 x 19 x 350] [________________] mm), with fastener to match mounting channel.

Cable Supports: [Porcelain] [Maple] clamps and saddles.

Manhole Steps: [Polypropylene plastic manhole step with 1/2-inch (13 mm) steel reinforcement.] [______________________________________.] Cast steps at [12] [__] inches ([300] [___] mm) on center vertically.

****** [OR] ******

Ladder: Aluminum, [__] rung, [___] foot ([___] m) length, with top hook to engage manhole step in riser casting. Provide one ladder for each manhole.

Sump Covers: ASTM A48; Class 30B gray cast iron.

ACCESSORIES

Underground Warning Tape: [4] [_____] inch ([100] [_____] mm) wide plastic tape, [detectable type,] colored [red] [yellow] [_____] with suitable warning legend describing buried electrical lines; Model [_____] as manufactured by [___________].

CAST-IN-PLACE MANHOLE ACCESSORIES

Frames and Covers: ASTM A48; Class 30B gray cast iron, [27] [30] inch size, machine finished with flat bearing surfaces. Provide cover marked [ELECTRIC.] [TELEPHONE.] [____________.] [to indicate utility.]

Cable Pulling Irons: Use galvanized rod and hardware.

Cable Rack Inserts: Minimum load rating of 800 pounds (365 kg).

Cable Rack Mounting Channel: [1-1/2 x 3/4] [____________] inch ([38 x 19] [______________] mm) steel channel, [48] [_____] inch ([1.2] [_____] mm) length. Provide cable rack arm mounting slots on [1-1/2] [____] inch ([38] [_____] mm) centers.

Cable Racks: [Steel channel, [1-1/2 x 3/4 x 14] [_____________] inches ([38 x 19 x 350] [________________] mm), with fastener to match mounting channel.

Cable Supports: [Porcelain] [Maple] clamps and saddles.

Manhole Steps: [Polypropylene plastic manhole step with 1/2-inch (13 mm) steel reinforcement.] [______________________________________.]

****** [OR] ******

Ladder: Aluminum, [__] rung, [___] foot ([___] m) length, with top hook to engage manhole step. Provide one ladder for each manhole.

Sump Covers: ASTM A48; Class 30B gray cast iron.

PART	EXECUTION

EXAMINATION

Verify excavation under provisions of Section [01039.] [_____.]

Verify that excavation, base material installation, and compaction is completed.

PREPARATION

Prepare excavation in accordance with manhole manufacturer's instructions.

DUCT BANK INSTALLATION

Install duct in accordance with manufacturer's instructions.

Install duct to locate top of ductbank at depths as indicated on drawings.

****** [OR] ******

Install [power] [communications] [____________] duct to locate top of ductbank minimum [_____] inches ([_____] mm) below [finished grade.] [_____.]

Install duct with minimum slope of 4 inches per 100 feet (100 mm per 30 m). Slope duct away from building entrances.

Cut duct square using saw or pipe cutter; de-burr cut ends.

Insert duct to shoulder of fittings; fasten securely.

Join nonmetallic duct using adhesive as recommended by manufacturer.

Wipe nonmetallic duct dry and clean before joining. Apply full even coat of adhesive to entire area inserted in fitting. Allow joint to cure for 20 minutes, minimum.

Install no more than equivalent of three 90-degree bends between pull points.

Provide suitable fittings to accommodate expansion and deflection where required.

Terminate duct at manhole entries using end bell.

Stagger duct joints vertically in concrete encasement [6] [__] inches ([150] [___] mm) minimum.

Use suitable separators and chairs installed not greater than [4] [___] feet ([1.2] [___] m) on centers.

Band ducts together before [backfilling.] [placing concrete.]

Securely anchor duct to prevent movement during concrete placement.

Place concrete under provisions of Section [03300.] [_____.] [Use mineral pigment to color concrete [red.] [_____.]]

Provide minimum [3] [__] inch ([75] [___] mm) concrete cover at bottom, top, and sides of ductbank.

Provide [two] [___] No. [4] [__] steel reinforcing bars in top of bank under paved areas.

Connect to existing concrete encasement using dowels.

Connect to manhole wall using dowels.

Provide suitable pull string in each empty duct except sleeves and nipples.

Swab duct. Use suitable caps to protect installed duct against entrance of dirt and moisture.

Backfill trenches under provisions of Section [02225.] [_____.]

Interface installation of underground warning tape with backfilling specified in Section [02225.] [_____.] Install tape [6] [__] inches ([150] [___] mm) below finished surface.

PRECAST MANHOLE INSTALLATION

Install and seal precast sections in accordance with manufacturer's instructions.

Install manholes plumb.

Use precast neck and shaft sections to bring manhole cover to finished elevation.

Attach cable racks to inserts after manhole installation is complete.

Install drains in manholes and connect to [site drainage system] [4 inch pipe terminating in [1/3] [_____] cu yd ([1/4] [_____] cu m) crushed gravel bed] under provisions of Section [15430.] [_____.]

Dampproof exterior surfaces, joints, and interruptions of manholes after concrete has cured 28 days, under provisions of Section [07160.] [_____.]

CAST-IN-PLACE MANHOLE INSTALLATION

Formwork: Form inside and outside manhole surfaces in accordance with provisions of Section [03100.] [_____.]

Reinforcing: Install reinforcing under the provisions of Section [03200.] [_____.]

Concrete: Provide air-entrained, 2000 psi (20 mPa) compressive strength at 28 days under the provisions of Section [03300.] [_____.]

Shape: [Square.] [Rectangular.] [As indicated.]

Nominal Dimensions: [_____] x [_____] feet ([_____] x [_____] m).

Inside Depth: [_____ ] feet ([_____ ] m).

Wall Thickness: [_____] inches ([_____]) mm.

Base: Include [14] [___] inch ([350] [____] mm) drain opening and two [1] [___] inch ([25] [___] mm) ground rod openings. Slope to drain at 0.25 inch per foot (2 percent).

Top: Include [39] [___] inch ([1] [__] M) diameter opening; cast 1/2 inch (13mm) rod in opening to accept ladder hook.

Duct Entry: Cast duct openings in walls as indicated.

Cable Pulling Irons: Locate opposite each duct entry.

Cable Rack Inserts: Locate at [_____] feet ([_____] M) on center.

Construct brick collar with [30] [___] inch ([760] [___] mm) clear opening to bring cover to proper elevation.

Manhole Steps: Cast steps at [12] [___] inches ([300] [____] mm) on center vertically.

****** OR ******

Install ladder in each manhole.

Attach cable racks to inserts after manhole construction is complete.

Install drains in manholes and connect to [site drainage system] [4 inch pipe terminating in [1/3] [_____] cu yd ([1/4] [_____] cu m) crushed gravel bed] under provisions of Section [15430.] [_____.]

Dampproof exterior surfaces, joints, and interruptions of manholes after concrete has cured 28 days, under provisions of Section [07160.] [_____.]

END OF SECTION