Okaloosa County BOCC — February 18, 2014 — Underground Electric Manhole — reading text

Covers: Recess in face of cover designed to accept finish material in paved areas. 2. Cover Legend: Cast in. Selected to suit system. a. Legend: "ELECTRIC-LV" for duct systems with power wires and cables for systems operating at 600 V and less. @ UNDERGROUND DUCTS DATE: 9/16/2013 OKALOOSA COUNTY WATER AND SEWER 16135 - 12 SECTION 16135 Russell Stephenson - Electrical Manhole Rehabilitation UNDERGROUND DUCTS b. Legend: "ELECTRIC-HV" for duct systems with medium-voltage cables. c. Legend: "SIGNAL" for communications, data, and telephone duct systems. Manhole Chimney Components: Precast concrete rings with dimensions matched to those of roof opening. a. Mortar for Chimney Ring and Frame and Cover Joints: Comply with ASTM C 270, Type M, except for quantities less than 2.0 cu. ft. where packaged mix complying with ASTM C 387, Type M, may be used. Manhole Sump Frame and Grate: ASTM A 48/A 48M, Class 30B, gray cast iron. Pulling Eyes in Concrete Walls: Eyebolt with reinforcing-bar fastening insert, 2-inch- diameter eye, and 1-by-4-inch bolt. Working Load Embedded in 6-Inch, 4000-psi Concrete: 13,000-lbf minimum tension. Pulling Eyes in Nonconcrete Walls: Eyebolt with reinforced fastening, 1-1/4-inch- diameter eye, rated 2500-lbf minimum tension. Pulling-In and Lifting Irons in Concrete Floors: 7/8-inch- diameter, hot-dip galvanized, bent steel rod; stress relieved after forming; and fastened to reinforcing rod. Exposed triangular opening. Ultimate Yield Strength: 40,000-lbf shear and 60,000-Ibf tension. Bolting Inserts for Concrete Utility Structure Cable Racks and Other Attachments: Flared, threaded inserts of mnoncorrosive, chemical-resistant, nonconductive thermoplastic material; 1/2-inch ID by 2-3/4 inches deep, flared to 1-1/4 inches minimum at base. Tested Ultimate Pullout Strength: 12,000 Ibf minimum. Expansion Anchors for Installation after Concrete Is Cast: Zinc-plated, carbon-steel- wedge type with stainless-steel expander clip with 1/2-inch bolt, 5300-lbf rated pullout strength, and minimum 6800-lbf rated shear strength. Cable Rack Assembly: Steel, hot-dip galvanized, except insulators. Stanchions: T-section or channel; 2-1/4-inch nominal size; punched with 14 holes on 1-1/2-inch centers for cable-arm attachment. Arms: 1-1/2 inches wide, lengths ranging from 3 inches with 450-lb minimum capacity to 18 inches with 250-lb minimum capacity. Arms shall have slots along UNDERGROUND DUCTS DATE: 9/16/2013 OKALOOSA COUNTY WATER AND SEWER 16135 - 13 SECTION 16135 Russell Stephenson - Electrical Manhole Rehabilitation UNDERGROUND DUCTS 2.8 K. ao full length for cable ties and be arranged for secure mounting in horizontal position at any vertical location on stanchions. Insulators: High-glaze, wet-process porcelain arranged for mounting on cable arms. Cable Rack Assembly: Nonmetallic. Components fabricated from nonconductive, fiberglass-reinforced polymer. Stanchions: Nominal 36 inches high by 4 inches wide, with minimum of 9 holes for arm attachment. Arms: Arranged for secure, drop-in attachment in horizontal position at any location on cable stanchions, and capable of being locked in position. Arms shall be available in lengths ranging from 3 inches with 450-lb minimum capacity to 20 inches with 250-Ib minimum capacity. Top of arm shall be nominally 4 inches wide, and arm shall have slots along full length for cable ties. Duct-Sealing Compound: Non-hardening, safe for contact with human skin, not deleterious to cable insulation, and workable at temperatures as low as 35 degrees F. Capable of withstanding temperature of 300 degrees F without slump and adhering to clean surfaces of plastic ducts, metallic conduits, conduit coatings, concrete, masonry, lead, cable sheaths, cable jackets, insulation materials, and common metals. Fixed Manhole Ladders: Arranged for attachment to wall, and floor of manhole. Ladder and mounting brackets and braces shall be fabricated from nonconductive, structural-grade, fiberglass-reinforced resin. Portable Manhole Ladders: UL-listed, heavy-duty fiberglass specifically designed for portable use for access to electrical manholes. Minimum length shall be equal to distance from deepest manhole floor to grade plus 36 inches. One required. Cover Hooks: Heavy duty, designed for lifts 60 Ibf and greater. Two required. SOURCE QUALITY CONTROL 1. Test and inspect precast concrete utility structures according to ASTM C 1037. Nonconcrete Handhole and Pull-Box Prototype Test: Test prototypes of manholes and boxes for compliance with SCTE 77. Strength tests shall be for specified tier ratings of products supplied. Tests of materials shall be performed by a independent testing agency. UNDERGROUND DUCTS DATE: 9/16/2013 OKALOOSA COUNTY WATER AND SEWER 16135 - 14 SECTION 16135 Russell Stephenson - Electrical Manhole Rehabilitation UNDERGROUND DUCTS 2. Strength tests of complete boxes and covers shall be by either an independent testing agency or the manufacturer. A qualified registered professional engineer shall certify tests by manufacturer. 3. Testing machine pressure gages shall have current calibration certification complying with ISO 9000 and ISO 10012, and traceable to NIST standards. PART 3 - EXECUTION 3.1 UNDERGROUND DUCT APPLICATION A. Ducts for Electrical Cables Over 600 V: RNC, NEMA Type EPC-80-PVC, in concrete-encased duct bank, unless otherwise indicated. B. Ducts for Electrical Feeders 600 V and Less: RNC, NEMA Type EPC-40-PVC, in concrete-encased duct bank, unless otherwise indicated. C. Ducts for Electrical Feeders 600 V and Less: RNC, NEMA Type EPC-80-PVC, in direct-buried duct bank, unless otherwise indicated. D. Ducts for Electrical Branch Circuits: RNC, NEMA Type EPC-40-PVC, in direct- buried duct bank, unless otherwise indicated. E. Underground Ducts for Telephone, Communications, or Data Utility Service Cables: RNC, NEMA Type EPC-40-PVC, in concrete-encased duct bank, unless otherwise indicated. F. Underground Ducts for Telephone, Communications, or Data Utility Service Cables: RNC, NEMA Type EPC-40-PVC installed in direct-buried duct bank, unless otherwise indicated. G. Underground Ducts Crossing Paved Paths, Walks, and Driveways, Roadways, and Railroads: RNC, NEMA Type EPC-40-PVC, encased in reinforced concrete. 3.2 UNDERGROUND ENCLOSURE APPLICATION A. — Handholes and Boxes for 600 V and Less, Including Telephone, Communications, and Data Wiring: 1. Units in Roadways and Other Deliberate Traffic Paths: Precast concrete. AASHTO HB 17, H-20 structural load rating. UNDERGROUND DUCTS DATE: 9/16/2013 @ OKALOOSA COUNTY WATER AND SEWER 16135 - 15 SECTION 16135 Russell Stephenson - Electrical Manhole Rehabilitation UNDERGROUND DUCTS B. 3.3 3.4 A. 2. Units in Driveway, Parking Lot, and Off-Roadway Locations, Subject to Occasional, Non-deliberate Loading by Heavy Vehicles: Precast concrete, AASHTO HB 17, H-20 structural load rating. 3. Units in Sidewalk and Similar Applications with a Safety Factor for Non- deliberate Loading by Vehicles: Precast concrete, AASHTO HB 17, H-10 structural load rating. 4. Units Subject to Light-Duty Pedestrian Traffic Only: Fiberglass-reinforced polyester resin, structurally tested according to SCTE 77 with 3000-Ibf vertical loading. Manholes: Precast concrete. 1. | Units Located in Roadways and Other Deliberate Traffic Paths by Heavy or Medium Vehicles: H-20 structural load rating according to AASHTO HB 17. 2. Units Not Located in Deliberate Traffic Paths by Heavy or Medium Vehicles: H- 10 load rating according to AASHTO HB 17. EARTHWORK Excavation and Backfill: Comply with Division 2 Section "Earthwork," but do not use heavy-duty, hydraulic-operated, compaction equipment. Restore surface features at areas disturbed by excavation and reestablish original grades, unless otherwise indicated. Replace removed sod immediately after backfilling is completed. Restore areas disturbed by trenching, storing of dirt, cable laying, and other work. Restore vegetation and include necessary topsoiling, fertilizing, liming, seeding, sodding, sprigging, and mulching. Comply with Division2 Sections "Lawns and Grasses" and "Exterior Plants." Cut and patch existing pavement in the path of underground ducts and utility structures according to Division 1 Section "Cutting and Patching." DUCT INSTALLATION Slope: Pitch ducts a minimum slope of 1:300 down toward manholes and handholes and away from buildings and equipment. Slope ducts from a high point in runs between two manholes to drain in both directions. UNDERGROUND DUCTS DATE: 9/16/2013 OKALOOSA COUNTY WATER AND SEWER 16135 - 16 SECTION 16135 Russell Stephenson - Electrical Manhole Rehabilitation UNDERGROUND DUCTS B. Curves and Bends: Use 5-degree angle couplings for small changes in direction. Use manufactured long sweep bends with a minimum radius of 48 inches, both horizontally and vertically, at other locations, unless otherwise indicated. C. Joints: Use solvent-cemented joints in ducts and fittings and make watertight according to manufacturer's written instructions. Stagger couplings so those of adjacent ducts do not lie in same plane. D. Duct Entrances to Manholes and Concrete and Polymer Concrete Handholes: Use end bells, spaced approximately 10 inches o.c. for 5-inch ducts, and vary proportionately for other duct sizes. 1. Begin change from regular spacing to end-bell spacing 10 feet from the end bell without reducing duct line slope and without forming a trap in the line. 2. Direct-Buried Duct Banks: Install an expansion and deflection fitting in each conduit in the area of disturbed earth adjacent to manhole or handhole. Geo Grout end bells into structure walls from both sides to provide watertight entrances. E. Coordinate design of concrete-encased duct banks approaching building wall penetrations with building structural design to support ducts at wall, without reducing structural or watertight integrity of building. Do not use steel conduit in highly corrosive soils. Coordinate with Drawings. F. Sleeves and sleeve seals for conduits penetrating building walls below grade are specified in Division 16 Section "Basic Electrical Materials and Methods." G. Building Wall Penetrations: Make a transition from underground duct to rigid steel conduit at least 10 feet outside the building wall without reducing duct line slope away from the building, and without forming a trap in the line. Use fittings manufactured for duct-to-conduit transition. Install conduit penetrations of building walls as specified in Division 16 Section "Basic Electrical Materials and Methods." H. Sealing: Provide temporary closure at terminations of ducts that have cables pulled. Seal spare ducts at terminations. Use sealing compound and plugs to withstand at least 15-psig hydrostatic pressure. I. Pulling Cord: Install 100-lbf- test nylon cord in ducts, including spares. J. Concrete-Encased Ducts: Support ducts on duct separators. 1. Separator Installation: Space separators close enough to prevent sagging and deforming of ducts, with not less than 4 spacers per 20 feet of duct. Secure UNDERGROUND DUCTS DATE: 9/16/2013 OKALOOSA COUNTY WATER AND SEWER 16135 - 17 SECTION 16135 Russell Stephenson - Electrical Manhole Rehabilitation UNDERGROUND DUCTS wo separators to earth and to ducts to prevent floating during concreting. Stagger separators approximately 6 inches between tiers. Tie entire assembly together using fabric straps; do not use tie wires or reinforcing steel that may form conductive or magnetic loops around ducts or duct groups. Concreting Sequence: Pour each run of envelope between manholes or other terminations in one continuous operation. a. Start at one end and finish at the other, allowing for expansion and contraction of ducts as their temperature changes during and after the pour. Use expansion fittings installed according to manufacturer's written recommendations, or use other specific