Gulfbox Junction Art. 815.04 Note 1. Gradation CA 6 shall be used. Note 2. Class SI concrete shall be used. CONSTRUCTION REQUIREMENTS
815.03 Installation. The location of the gulfbox junction shall be excavated
so that the top of the gulfbox is set flush with the sidewalk or paved surface. When installed in earth shoulder away from the pavement edge, the top surface of the gulfbox shall be 1 in. (25 mm) above the finished grade. The excavation shall be deep enough to accommodate the depth of the box and the base. When the gulfbox is to be constructed over existing conduit, the conduit shall be cut, 90 degree elbows instaIled, and the box constructed as shown on the plans.
a.Cast Iron Gulfbox. The base shall be constructed of 6 in. (150 mm) of concrete placed at the bottom of the excavation. The concrete shall be placed around the conduits and the conduits shall protrude approximately 1/2 in. (13 mm) above the concrete surface. The casting shall be secured by setting the bottom flange into the concrete surface 1/2 to 3/4 in. (13 to 19 mm) while the concrete is still plastic and then trowel the surface smooth. Any piping slots in the sides shall be plugged. The remaining excavation shall be backfilled with suitable material.
b.Composite Concrete Gulfbox. The base shall be constructed of 6 in. (150 mm) of coarse aggregate placed at the bottom of the excavation. The conduits shall protrude approximately 1 in. (25 mm) above the coarse aggregate. The gulfbox shall be set on this base. The remaining excavation shall be backfilled with coarse aggregate. If located in sidewalk or other paved surface, the gulfbox shall be set with a minimum of 3 in. (75 mm) of concrete placed on each side of the gulfbox. Preformed joint filler of 1/2 in. (13 mm) thickness shall be placed between new concrete and existing concrete.
815.04 Basis of Payment. This work will be paid for at the contract unit price
per each for GULFBOX JUNCTION, of the kind of material when specified. Art. 816.01 Unit Duct LIGHTING WIRE AND CABLE SECTION 816. UNIT DUCT
816.01 Description. This work shall consist of furnishing and installing
preassembled cable in coilable nonmetallic conduit (unit duct), complete with all splicing, identifications, and terminations.
816.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Unit Duct ............................................................................................ 1066.01
b.Coilable Nonmetallic Conduit ......................................................... 1088.01(c)
c.Conductors (Note 1) .......................................................................... 1066.02
d.Cable Insulation ................................................................................. 1066.03
e.Splicing and Termination of Electric Cable ........................................ 1066.06
f.Wiring Identification Markers ............................................................. 1066.07
g.Electrical Tape ................................................................................... 1066.08 Note 1. Copper conductors shall be used. CONSTRUCTION REQUIREMENTS
816.03 Installation. Unit duct shall be installed according to Article 810.04
and the following. Use of the word conduit in Article 810.04 shall be construed to mean unit duct. The unit duct shall be installed directly from the reels on which the unit duct was shipped, in continuous spans between terminal points. Splicing will only be permitted in pole handholes or junction boxes on bridge structures above grade. Where unit duct passes through handholes or pull boxes, the polyethylene duct shall be cut open and the continuous, uncut and unspliced conductors exposed and looped within the handhole or pull box. The ends of the polyethylene duct must be sealed with duct sealant and mounted in the handhole to prevent entrance of moisture or contaminants. When the unit duct is to be pulled, the pulling apparatus shall be attached to the duct and not to the cables. The pulling tension on the duct shall not exceed 550 lb (2.4 kN). Minimum bending radius for the installed unit duct assembly shall be no smaller than the manufacturer’s recommended radius. Bends shall be made so that the duct will not be damaged or kinked and the internal diameter of the duct will not be effectively reduced. There shall not be more than the equivalent of four quarter bends between pull points and no bend greater than 90 degrees.
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 712–713 of 1,217. View official source ↗