Effective with the December 2018 Letting 415 2019 Standard Spec ifications Section 634 Wood and Tubular Steel Sign Posts
634.1 Description
1.This section describes furnishing and erecting wood and tubular steel posts to support signs.
634.2 Materials
634.2.1 Wood
1.Furnish posts conforming to 507.2.2 for lumber and timber, of the dimensions the plans show, and having 4 sides surfaced (S4S). U se either beam and stringer gra de or structural joist and plank grade material with a minimum stress grade rating of 1200 fb at 19 pe rcent maximum moisture.
2.Select posts from one of the softwood species listed in 614.2.5 for wood posts and offset blocks.
3.Pressure treat posts conforming to 507.2.2.6 using chromated copper arsenate solution.
634.2.2 (Vacant)
634.2.3 (Vacant) 634.2.4 (Vacant)
634.2.5 Tubular Steel
634.2.5 1 General
1.Furnish tubular steel sign post assemblies consisting of 3 tel escoping square steel tubes as follows: 1. Breakaway upper tube for mounting the sign. 2. Inside anchor tube. 3. Outside anchor tube.
2.Fabricate the tubular components using structural quality 12-gauge strip steel conforming to ASTM A1011, grade 50 with an average minimu m yield strength, after cold-f orming, of 55,000 psi. Punch holes on all 4 sides for the fu ll length as the plans show. Pro vide corner radii of approximately 5/32 inches and conform to other dim ensions and tolerances as follow s: TABLE 634-1 TUBULAR POST DIMENSIONS AND TOLERANCES[1] COMPONENT OUTSIDE DIMENSIONS inches OUTSIDE DIMENSION TOLERANCE inches ALLOWABLE TWIST[2] inches/3 feet UPPER TUBE 2.00 x 2.00 +/-0.008 +/-0.062 INSIDE ANCHOR TUBE 2.25 x 2.25 +/-0.010 +/-0.062 OUTSIDE ANCHOR TUBE 2.50 x 2.50 +/-0.010 +/-0.075 [1] Measure at least 2 inches from the ends of the tubes. [2] Hold one side on a flat surface plate and measure the twist at the corner 3 feet away.
3.Hot-dip galvanize each tube according to ASTM A653 grade 90. Treat corner welds and cut ends with cold-galvanized organic zinc pai nt as manufacturer recommends.
4.The engineer will inspect sign po st assemblies before installa tion. Ensure that the assemblies fit together without damaging the coat ings. Replace scratched or otherwise damaged components at no expense to the department.
634.2.5 2 Upper Tube
1.Furnish upper tubes fabricated to the lengths the plans show. If the plans show colored stock clean and phosphate before painting with an acrylic paint using an electrodeposition process followed by baking. 634.2.5.3 Anchor System
1.Assemble the anchor system, con sisting of the inner and outer anchor tubes, as the plans show with a 3-inch, grade 5 zinc plated bolt and nut. Ensure the holes of t he 2 tubes match. For installations in poured concrete use an 18-inch inner tube and an 18-inch outer tube with no soil stabilization fins. For other installations use a 36-inch inner tube and an 18-inch out er tube with soil stabilization fins.
634.3 Construction
1.Obtain the engineer's approva l and locate underground faciliti es before installing sign posts. Do not install sign posts until the finished grade is established.
2.Set and laterally position post s for supporting roadside signs as specified in 637.3.3.2 . Erect posts in a true vertical position. Orient s ign posts as the plan details show to ensure that pos ts will yield or break on impact as designed. For installations in concrete or asphalt, use box-outs as the plan details show. Effective with the December 2018 Letting 416 2019 Standard Spec ifications (3) Excavate holes for wood posts to the depths and at the locatio ns the plans show or the engineer directs. Backfill with excavated material placed and compacted in 6-inch layers. Do not paint wood posts.
4.Cut upper tubes of steel posts to provide the sign height the plans show or the engineer directs. Treat cut steel post surfaces after inst allation with cold-galvanized organic zinc paint according to the paint manufacturer's instructions.
5.Attach the required sign panels as the plans show or as the en gineer directs.
6.Remove and dispose of excess ex cavation, surplus material, and debris resulting from the installation.
634.4 Measurement
1.The department will measure the Posts Wood bid items as each individual post acceptably completed.
2.The department will measure the Posts Tubular Steel bid items as each individual post assembly, including each section and anchor, acceptably completed.
634.5 Payment
1.The department will pay for measured quantities at the contrac t unit price under the following bid items: ITEM NUMBER DESCRIPTION UNIT 634.0400 - 0699 Posts Wood (size) (length) EACH 634.0800 - 0899 Posts Tubular S teel (size) (length) EACH
2.Payment for the Posts Wood bid items is full compensation for providing, hauling, and placing the posts; for excavating and backfilli ng post holes; and for remov ing and disposing of surplus material.
3.Payment for the Posts Tubular Steel bid items is full compensa tion for providing, hauling, and placing the posts; treating cut post ends; a nd providing hardware and a nchors. The department will not pay for replacing damaged posts or upper tube cut-offs. Effective with the December 2018 Letting 417 2019 Standard Spec ifications Section 635 Structural Steel Sign Supports
635.1 Description
1.This section describes providi ng breakaway steel sign supports and replacing base connection bolts.
635.2 Materials
1.Furnish ASTM A709, grade 50 for steel sign supports. Hot-dip zinc coat the sign support posts and stubs according to ASTM A123 after completing cutting, drilli ng, punching, and welding. Fur nish mill inspection and testing certifications for posts and stubs confo rming to 506.3.21 .
2.Furnish supplier-certified ASTM F3125 A325, type 1 steel bolts, ASTM A563 nuts, and ASTM F436 washers all hot-dip galvanized according to ASTM A153 supplemented by ASTM F2329.
635.3 Construction
635.3.1 Structural Steel Sign Supports
1.Locate and erect the su pports as specified for placement and o rientation in 637.3.3.2 . Construct concrete footings conforming to 636.
2.Lubricate base connection bolts and nuts with a wax-based lubr icant. Follow the tightening procedure the plan details specify. Use a c alibrated torque wrench to establish the final required torque.
3.Protect materials from damage to the zinc coating during trans portation, storage, and erection. Paint cuts and other areas of damaged zinc coating with 2 coats of zi nc dust/zinc oxide paint. Clean damaged and adjacent areas by sanding, scraping, chipping, or wire brushing before painting.
4.Perform shop welding for struct ural steel sign supports as the plans show and conforming to AWS D 1.1, Structural Welding Code - Steel. Do not weld in the field without the engineer's written approval. The engineer will only allow field welding for repairs in noncr itical locations and when a department- approved individual competent to perform inspections is present during the welding. Perform field welding using personnel qualified under AWS D 1.5, Bridge Weldi ng Code.
635.3.2 Replacing Base Connection Bolts
1.Install new bolts at locations t he contract specifies conformi ng to torque requirements in the plan details. Repair or replace existing posts, base plates, and stiffener plates damaged during bolt replacement.
635.4 Measurement
1.The department will measure Sign Supports Structural Steel HS by the pound acceptably completed, measured using the pay weight s the plan details show.
2.The department will measure Sign Supports Replacing Base Conne ction Bolts as each individual sign location acceptably completed.
635.5 Payment
1.The department will pay for measured quantities at the contrac t unit price under the following bid items: ITEM NUMBER DESCRIPTION UNIT 635.0200 Sign Supports Structural Steel HS LB 635.0300 Sign Supports Replacing Base Connection Bolts EACH
3.Payment for Sign Supports Replac ing Base Connection Bolts is full compensation for providing new bolts for each contract designat ed sign; and for repairing dama ge done during bolt replacement.
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Source: Wisconsin Standard Specifications for Highway and Structure Construction, 2019 Edition. Pages 424–425 of 601. View official source ↗