City of Frisco Engineering Standards

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Version 6/19/12 SECTION 321314 ROLLING PART 1 - GENERAL 1.01 DESCRIPTION A. All material, labor, equipment, tools and superintendence necessary for Rolling in accordance with Public Works Construction Standards, NCTCOG, 4 th Edition, Item 301.1.2. 1.02 REFERENCES A. Public Works Construction Standards, NCTCOG, 4 th Edition, Item 301.1.2 PART 2 - PRODUCTS 2.01 MATERIALS A. TAMPING ROLLER 1. Tamping rollers shall consist of two (2) metal rollers, drums or shells of not less than forty inches (40") in diameter, each not less than forty-two inches (42") in length and unit mounted in a rigid frame in such a manner that each roller may oscillate independently of another. Each roller, drum or shell shall be surmounted by metal studs with tamping feet projecting not less than seven inches (7") from the surface and spaced not less than six inches (6") nor more than 10 inches (10") measured diagonally center to center; and the cross-sectional area of each tamping foot measured perpendicular to the axis of the stud, shall be not less than five square inches (5") nor more than eight square inches (8"). The roller shall be of the type that by ballast loading, the load on each tamping foot may be varied uniformly from 125 p.s.i. of cross-sectional area. The load per tamping foot will be determined by dividing the total weight of the roller by the number of tamping feet in one row parallel to or approximately parallel to the axis of the roller. 2. The tamping roller shall be drawn by approved equipment of adequate tractive effort. Power equipment used in embankment construction shall be the crawler type tractor. Two (2) tamping rollers conforming to the above requirements, drawn by approved equipment, shall be considered a roller unit. B. TIRE ROLLER 1. Tire rollers shall consist of not less than nine (9) pneumatic-tired wheels, running on axles in such a manner that the rear group of tires will not follow in the tracks of the forward group of wheels, and mounted in a rigid frame, and shall be of a type suitable for ballast loading. The distance between the front and rear axles shall be not less than five feet (5') no more than 10 feet (10'). 2. The front axle shall be attached to the frame in such a manner that the roller may be turned in a minimum circle. The pneumatic tire roller shall have an effective rolling width of approximately sixty inches (60"), and shall be ballast loaded so that the load may be varied uniformly from not less than 100 p.s.i. of width of tire tread to 325 pounds per inch of tire tread. The roller, under working conditions, shall provide a uniform compression under all wheels. The total combined width of effective tire tread shall be not less than eighty-five percent (85%) of the effective rolling width. The pneumatic tire City of Frisco May 2012 Standard Technical Specification Rolling 321314-1
Version 6/19/12 PART 3 - EXECUTION 3.01 PREPARATION roller shall be drawn by either an approved crawler type, a pneumatic tread tractor, or a truck of adequate tractive effort; and the roller when drawn by either type of equipment shall be considered a pneumatic tire roller unit. Power equipment for rolling on asphalt shall be equipped with pneumatic tires. A. The embankment or base course shall start longitudinally at the sides and proceed toward the center, overlapping on successive trips at least one-half (l/2) of the width of the pneumatic tire roller unit. Alternate trips of the roller unit shall begin at the low sides and progress toward the high sides. B. The speed of the power roller and the tamping roller unit, unless otherwise directed by the City, shall be between two (2) and three (3) miles per hour. The speed of the pneumatic tire unit, unless otherwise directed by the City, shall be between four (4) and twelve (12) miles per hour for asphalt surfacing work and between two (2) and six (6) miles per hour for all other compaction work. PART 4 - MEASUREMENT AND PAYMENT 4.01 MEASUREMENT A. This Item shall not be measured as a separate contract Item. 4.02 PAYMENT A. The work performed and materials furnished in accordance with this Item will not be paid for directly but will be subsidiary to pertinent Items. END OF SECTION City of Frisco May 2012 Standard Technical Specification Rolling 321314-2
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City of Frisco Engineering Standards

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