The contract unit price for each type of sign structure foundation designated in the bidding schedule shall include full compensation for furnishing all labor, materials, tools, equipment , and incidentals, and for doing all the work involved in constructing foundations, complete in place, including steel reinforcement, furnishing and installing anchor bolts, all necessary excavation, backfilling , and disposing of excess excavated material, all as shown on the plans and as specified in these specifications. SECTION 607 ROADSIDE SIGN SUPPORTS: 607- 1 Description: The work under this section shall consist of furnishing and installing roadside sign supports in accordance with the details shown on the plans and the requirements of the specifications. Sign supports shall consist of breakaway, slip base, perforated and U - channel sign posts. The type, size, and installation location of the sign posts will be shown on the project plans. 607- 2 Materials: 607- 2.01 General: Certificat es of Analysis conforming to the requirements of Subsection
106.05 of the specifications shall be submitted for breakaway sign post
shapes Certificates of Compliance conforming to the requirements of Subsection
106.05 of the specifications shall be submitt ed for perforated sign posts
and U -channel sign posts. 607- 2.02 Breakaway Sign Post Shapes: Posts shall be fabricated from structural steel conforming to the requirements of ASTM A572, Grade 50 or ASTM A588 at the opt ion of the contractor. Base plates for the breakaway connections and friction fuse plates and back plates for the post hinge assembly shall be fabricated from the same type structural steel selected for the sign posts. All plate holes shall be drilled and all plate notches shall be saw cut, except that flame cutting will be permitted provided all edges are ground. Flange holes shall be drilled or sub- punched and reamed. The posts shall be saw cut for the hinge and bolted as detailed on the plans. Bolts, nuts and washers shall conform to the requirements of ASTM A325. TABLE OF CONTENTS INDEX Posts and plates shall be galvanized after fabrication in accordance with the requirements of ASTM A123. Bolts, nuts, and washers shall be cadmium plated in accordance with the requirements of ASTM B766, or zinc plated in accordance with the requirements of ASTM B633. 607- 2.03 Perforated Sign Posts: Single and telescoping perforated posts shall be square tube fabricated from galvanized sheet steel. The sheet steel shall have a thickness of 0.105 inches (12 gauge) or 0.135 inches (10 gauge) as required by the project specifications. Sheet steel shall conform to the requirements of ASTM A653 for either SQ Grade 40 or SQ Grade 50 Class 1, and be galvanized in accordance with the requirements of Coating Designation G-90. The posts shall have a wall thickness, including coating, of 0.097 to 0.116 inches for 12 gauge and 0.127 to 0.146 inches for 10 gauge. Posts shall be welded directly in the corner by high frequency resistance welding or equal. The outside edges of the posts shall be scarfed as necessary to produce a standard corner radii of 5/32 ± 1/32 inch. External welded surfaces and scarfed areas shall be re- galvanized after fabrication. Holes 7/16 ± 1/64 inch in diameter shall be provided on 1 -inch centers along all four sides over the entire length of the post. The holes shall be laterally centered on the longitudinal centerline of each face. Hole positioning and spacing shall be the same on all four faces, such that the hole centerlines for each group of four holes shall pass through a common point on the longitudinal centerline of the tube. For telescoping posts, holes shall be in proper alignment to al low 3/8- inch diameter bolts to pass through the entire post. The finished posts shall be straight and have a smooth, uniform finish. All consecutive sizes of posts shall be freely telescoping for not less than 10 feet of their length without the necessity of matching any particular face to any other face. Perforated sign posts shall be manufactured by an approved manufacturer. A list of approved manufacturers of perforated sign posts is shown on the Department’s Approved Products List (APL). Copies of the most current version of the APL are available on the internet from the Arizona Transportation Research Center (ATRC), through its PRIDE program. Bolts shall conform to the requirements of SAE Specification J429, Grade 5, or ASTM A449, Type 1. Nuts shall conform to the requirements of ASTM A563, Grade A. Washers shall conform to the requirements of ASTM F844. TABLE OF CONTENTS INDEX Bolts, nuts, and washers shall be zinc coated in accordance with the requirements of ASTM B633 or cadmium plated in accordance with the requirement s of ASTM B766. 607- 2.04 U-Channel Sign Posts: U-channel posts shall be fabricated from rerolled rail steel or hot -rolled carbon steel bars. Prior to rerolling the rail steel, the rail nominal weight shall be 91 pound s per yard and shall meet the requirements of ASTM A1 pertaining to quality assurance. Yield Point of the steel shall be 80,000 pounds per square inch minimum. The cast heat analysis of the steel shall conform to the following requirements: Element Composition (Percent) Carbon 0.67 - 0.82 Manganese 0.70 - 1.10 Phosphorus: Max. 0.04 Sulfur: Max. 0.05 Silicon 0.10 - 0.25 Posts shall be a uniform, modified, flanged channel -section as shown in the plans. Weight of the posts shall be three pounds per lineal foot, plus or minus 5 percent. The post shall be punched with continuous 3/8- inch diameter holes on 1 -inch centers. The first hole shall be 1 inch from top and bottom of post. The post shall consist of two parts, a sign post and a base post. The sign post lengths shall be supplied in 6-inch increments up to 12 feet as required for the installation location. The base posts shall be 42 inches in length, pointed at one end, and have at least 18 holes in the base post, starting 1 inch from the top and continuing at 1-inch increments. Posts shall be machine straightened to have a smooth uniform finish, free from defects affecting their strength, durability, or appearance. All holes and rough edges shall be free from burrs. The permissible tolerance for straightness shall be within 1/16 inch in 3 feet. Posts shall be galvanized after fabrication in accordance with the requirements of ASTM A123. Bolts, nuts, washers, and spacers shall be cadmium plated in accordance with the requirements of ASTM B766 or zinc plated in accordance with the requirements of ASTM B633. For shipment, the posts shall be nested and fastened in such a manner that they will not slip. Care shall be taken during shipping to minimize the rubbing of posts together resulting in damage to the galvanized finished surface. Excessive damage to the finish of the posts during TABLE OF CONTENTS INDEX shipping or handling will result in rejection of the damaged posts. Posts shall be bundled in groups of no more than 100. U-channel base posts shall be driven into the ground to a depth of 38 inches. Where rock is encountered, the rock shall be cored, drilled, or removed to a minimum diameter of 8 inches and to a depth sufficient to place Portland cement concrete 2 inches below the bottom of the base post and fill the hole to within 1 inch of the top. Solid rock coring or drilling is not required to continue beyond 24 inches in depth regardless of the depth at which the rock is encountered. The base post may be cut at the bottom prior to being set in Portland cement concrete where rock does not permi t use of full length base post. 607- 2.05 Concrete: Concrete for breakaway sign post foundations shall be Class B, except that utility concrete may be used for foundations using stub post sizes S 3 x 5.7 and S 4 x 7.7. Class B concrete shall conform to the requirements of Section 1006 of the specifications and utility concrete to the requirements of Section 922 of the specifications. Concrete for perforated sign posts foundations and U -channel sign post foundations, when required, shall conform to the requirements of Subsections 922- 2 and 922- 3 of the specifications. Foundation stub posts shall be fabricated from the same type of steel selected for the appropriate sign posts. Breakaway stub posts shall be galvanized a minimum of 12 inches down from the top of the stub. Galvanizing shall be in accordance with the requirements of ASTM A123. Reinforcing steel bars for breakaway sign post foundations shall conform to the requirements of ASTM A615. Unless otherwise specified, steel bars meeting the requirement s of ASTM A706 may be substituted for ASTM A615 steel bars. When ASTM A706 bars are used, tack welding of the reinforcement will not be permitted unless approved in writing by the Engineer. Reinforcing steel wire shall conform to the requirements of ASTM A82. 607- 2.06 Slip Base: Slip bases shall be manufactured by an approved manufacturer. A list of approved manufacturers of slip bases is shown on the Department’s Approved Products List (APL). 607- 3 Construction Requirements: Fabrication of the breakaway sign posts, stub posts, and base plates shall conform to the requirements of Subsection 604- 3.02 of the specifications, except that shop drawings will not be required. TABLE OF CONTENTS INDEX Breakaway sign post lengths will be determined by the Engineer at the time of construction staking and will be furnished to the contr actor prior to ordering fabrication of the sign posts. Perforated and U -channel sign post lengths shall be determined by the contractor at the time of construction staking. Posts shall be cut to the proper lengths in the field. Splicing will be permitted for single perforated posts; however, splices will be limited to one per each post installation and the splicing shall be accomplished in accordance with the details shown on the plans. The minimum length of any spliced piece of post shall be 2 feet. Foundations for the breakaway sign posts, perforated sign posts and when required, U -channel posts shall be constructed to the details and dimensions shown on the plans. Concrete shall be placed in accordance with the requirements of Section 601 or 922 of th e specifications, as the case may be. Excavation shall conform to the requirements of Subsection 203- 5.03(A) of the specifications. Sign posts shall be erected plumb and shall be bolted to the foundation stub or base posts in accordance with the procedure specified on the plans. Slip bases shall be assembled as shown in the Standard Drawings and installed in accordance with the manufacturer’s instructions. 607- 4 Method of Measurement: Breakaway sign posts will be measured by the linear foot for each size of post furnished and erected. The length of each size of post will be measured from the bottom of the upper base plate to the top of the post, measured to the nearest 0.1 feet. The total length of all posts of the same size will be rounded to the nearest foot. Perforated sign posts will be measured by the linear foot of each type of post furnished and installed. The length of each type of post will be measured from the top of the concrete post foundation to the top of the post, measured to the nearest 0. 1 feet. The total length of all posts of the same type will be rounded to the nearest foot. Telescoping post members will be considered as one post after installation and will not be measured separately. U -channel posts will be measured as each. Foundat ions for signposts will be measured by the unit for each type of foundation constructed, except that concrete and excavation, when required for setting U -channel base posts, will be considered as part of the post. Slip base for sign posts will be measured by the unit of each. TABLE OF CONTENTS INDEX