City of Frisco Engineering Standards

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Version 6/19/12 SECTION 330523 TRENCHLESS UTILITY INSTALLATION PART 1 – GENERAL 1.01 DESCRIPTION A. All material, labor, equipment, tools and superintendence necessary to furnish and install utility lines using trenchless installation methods in accordance with Public Works Construction Standards, NCTCOG, 4 th Edition, Item 503. 1.02 REFERENCES A. Public Works Construction Standards, NCTCOG, 4 th Edition, Item 503 B. City of Frisco’s Standard Details included in the plans. 1.03 QUALITY ASSURANCE A. DESIGN CRITERIA The pipe casing (or carrier pipe on uncased bores) shall be designed by a Licensed Professional Engineer for the following loading conditions and applicable combinations thereof: 1. Cooper's E-80 Railway loading or AASHTO HS20 loading as applicable 2. Earth loading with the height of fill above the casing as shown on the plans 3. Loads applied during jacking, including axial load from jacking 4. All other applicable loading conditions, including loads applied during transportation and handling. B. INSTALLER'S QUALIFICATIONS Installation shall be by a competent, experienced contractor or sub-contractor. The installation contractor shall have a satisfactory experience record of at least three (3) years engaged in similar work of equal scope. All welding shall be performed by a certified welder in the state of Texas. C. PERFORMANCE REQUIREMENTS 1.04 SUBMITTALS Lateral or vertical variation in the final position of the pipe casing (or carrier pipe on uncased bores) from the line and grade established by the ENGINEER shall be permitted only to the extent of 1" in 10' feet, provided that such variation shall be regular and only in the direction that will not detrimentally affect the function of the carrier pipe. Submittals shall include: City of Frisco May 2012 Standard Technical Specification Trenchless Utility Installation 330523-1
Version 6/19/12 A. Shop drawings of the casing pipe (or carrier pipe for uncased bores) from the manufacturer. Shop drawings shall include calculations for the design of the casing pipe (or carrier pipe for uncased bores) by a Licensed Professional Engineer. B. Provide Certificate of Adequacy of Design of casing and/or carrier pipe. C. Provide record data of casing insulators including sketches of insulators with material components and dimensions and proposed locations of insulators. D. Provide Pressure Grout material and method. PART 2 – PRODUCTS 2.01 MATERIALS A. Refer to Public Works Construction Standards, NCTCOG, 4 th Edition, Item 503.2. B. High Density Polyethylene casing spacers are required unless otherwise specified. Refer to the City of Frisco Approved Materials List. C. Steel casing pipe shall be new (or used if approved by the OWNER) and suitable for the purpose intended and shall have a minimum yield strength of 35,000 psi. Casing shall meet ASTM A-36, ASTM A-570, ASTM A-135, ASTM A-139, or approved equal. D. Casing pipe shall be coated with coal tar epoxy (15 mils min.) in accordance with AWWA C- 210. Pipe joints shall be welded in accordance with AWWA C-206. After pipe is welded, coating shall be repaired. PART 3 – EXECUTION 3.01 GENERAL A. Refer to Public Works Construction Standards, NCTCOG, 4 th Edition, Item 503.3. B. All casing pipe joints shall be watertight with no water entering the casing from any sources prior to carrier pipe installation. C. The carrier pipe shall be installed within the casing between the limits indicated on the Plans to the specified lines and grades, and utilizing methods which include due regard for safety of workers, adjacent structures and improvements, utilities, and the public. D. Furnish all necessary equipment, power, water, and utilities for carrier pipe installation, insulator runner lubricant, grouting, and other associated Work required for the Contractor's methods of construction. E. Conduct all operations such that trucks and other vehicles do not interfere with traffic or create a dust or noise nuisance in the streets and to adjacent properties. Promptly clean up, remove, and dispose of spoils and slurry spillage and any slurry discharges. City of Frisco May 2012 Standard Technical Specification Trenchless Utility Installation 330523-2
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City of Frisco Engineering Standards

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