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. Effective with the December 2018 Letting 418 2019 Standard Spec ifications Section 636 Concrete Sign Supports
636.1 Description
1.This section describes construct ing drilled shaft concrete foo tings for structural steel sign supports constructed under 635 and for sign bridges and overh ead sign supports constructed un der 641.
636.2 Materials
1.Use materials conforming to the following requirements: Concrete ...................................................... ................................................................................................... 501 Steel reinforcement ......................................................................................................................................... 505
2.Furnish grade A, A-FA, A-S, A-T , A-IS, A-IP, or A-IT concrete conforming to 501 as modified in 716. Provide QMP for class II ancilla ry concrete as specified in 716.
636.3 Construction
636.3.1 General
1.Construct drilled shaft footings and associated wings as speci fied for footings in 502.3 . Cure exposed portions of concrete footings as specified in 502.3.8.1 . Wait until the concrete has attained 3500 psi compressive strength or 7 equivalent days as specified in 502.3.10 before erecting any portion of the structure on the footing.
2.The contractor shall locate the footing so that after properly erecting the sign support or sign bridge and after installing t he sign or signs they are at the position, elevation, and orientation the plans, and specifications specify, o r as the engineer directs.
3.If the contract requires, insta ll a 5/8-inch by 10-foot copper clad ground rod at the sign support. Install the rod next to the support or as the engineer directs.
636.3.2 Excavation
1.Before beginning any excavation, locate existing underground c able, utility, or drainage structures in the vicinity and conduct operations to avoid damaging them.
2.Excavate the footing to the required depth and diameter with m inimal disturbance to adjacent soil.
636.3.3 Placing Concrete
1.Place the concrete for the footing in the excavation, against the soil without forming, except as specified otherwise below.
2.Place concrete to the initial height the plans show. Form the portion of the sign bridge footing that extends above the ground.
3.If steel reinforcement is requ ired, secure it in place before placing the concrete.
4.Set and secure the an chor rod assemblies a nd post stubs at the ir proper location until the concrete hardens. Protect anchor rod threads above the top of the foundation level from concrete splash.
5.Construct drilled shafts to extend above the finished ground e levation according to plan details. Do not place construction joints w ithout the engineer's written approv al. Line the upper 18 inches with a disposable casing to ensure a uni form diameter. Remove the disp osable casing before backfilling. For the upper surface, provide a level plane finished true to grade .
6.If the engineer determine s the possibility o f cave-ins, or soil displacement from the walls exists, or if necessary to shut off seepage wate r, then line the remaining de pth of the footing shaft with a suitable casing. Ensure casings are of a mple strength to withstand handling stresses, concrete pressure, and the pressure of surrounding so il materials. If removing the cas ings, withdraw them while placing the footing concrete or immediately following concrete operations. If removing the casing during the concrete operation, place at least 2 feet of concrete before st arting to pull the casing, and maintain a head of concrete of from one to 2 feet during the pulling operation. Take care when pulling the casing to prevent moving the stub posts or anchor rod assembly, reinforcement steel, and upper casing, and to prevent any appreciable quantity of soil from mixing with th e concrete.
7.If required, cast the electrical conduit in the footing accord ing to the plan details.
636.3.4 (Vacant)
636.3.5 Clean-Up
1.After completing work and before acceptance, remove and dispos e of excess excavation and surplus or discarded materials, and restore work or property damaged during operations.
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Source: Wisconsin Standard Specifications for Highway and Structure Construction, 2019 Edition. Pages 426–426 of 601. View official source ↗