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. Effective with the December 2018 Letting 419 2019 Standard Spec ifications 636.4 Measurement
636.4.1 Concrete
1.The department will measure Sign Su pports Concrete Masonry by the cubic yard acceptably completed. The department will bas e measurement on the dimensio ns the plans show or that the engineer orders in writing. The department will not measure concrete placed outs ide the designated dimensions.
636.4.2 Steel Reinforcement
1.The department will measure the Sign Supports Steel bid items by the pound acceptably completed. The department will compute the we ight as specified for bar ste el reinforcement under 505.4 .
636.5 Payment
1.The department will pay for measured quantities at the contrac t unit price under the following bid items: ITEM NUMBER DESCRIPTION UNIT 636.0100 Sign Supports Concrete Masonry CY 636.0500 Sign Supports Steel Reinforcement LB 636.1000 Sign Supports Steel Reinforcement HS LB 636.1500 Sign Supports Steel Coated Reinforcement HS LB
2.Payment for Sign Suppo rts Concrete Masonry is full compensatio n for providing concrete; for providing and removing casing; for providing required ground rods; for excavating and backfilling; for placing post stubs or anchor rods; for providing electrical con duit; for cleaning-up, repairing damage, and for disposing of excavation and surplus materials.
3.Payment for the Sign Supports Steel bid items is full compensa tion for providing sign supports. Effective with the December 2018 Letting 420 2019 Standard Spec ifications Section 637 Signing
637.1 Description
1.This section describes provi ding signs, of the type or types s pecified, on supports in place or erected under the contract.
637.2 Materials
637.2.1 Sign Base Materials 637.2.1.1 Aluminum Extrusions
1.Use the style of aluminum extru sions specified in the plans. T he engineer will ac cept any shape reasonably close to the shape illustrated, with no interlocking arrangement, and c onforming to the minimum weight requirements the plans specify. Use the same style and brand of extrusion required for all the work under the contract. Use aluminum extrusions co nforming to ASTM B221, alloy 6061- T6, 6063-T5, or 6063-T6.
2.Perform shearing, cutting, punching, drilling, or other fabric ation procedures on extruded panels before preparing the aluminum to receive reflective material.
3.The department will allow a maximu m deviation from flat on the face of extrusions of 0.004 inches per one inch of extrusion width.
4.The engineer will not require sign edge molding.
637.2.1 2 High-Density Overlaid Plywood
1.Use base material conforming to the U.S. Product Standard PS 1 for construction and industrial plywood. Use 7-ply material manuf actured from a group 1 wood an d conforming to the requirements for B-B or better high-density overlay exterior plywood intended for use in highway signs, and suitable for applying reflective sheeting to without furt her surface pre paration other than as specified below in
637.3.2 .
2.Make plywood sign panels from m aterial not less than 5/8 inch thick, except that for signs with a face 2 feet by 2 feet or less with th e horizontal dimension no greater than the vertical dimension, the contractor may use 1/2 inch thick material.
637.2.1 3 Sheet Aluminum
1.For this base material, use aluminum alloy 5052-H38 complying with ASTM B209.
2.Ensure sign blanks are free from laminations, blisters, sliver s, open seams, pits from heavy rolled-in scale, ragged edges, holes, turned-down cor ners, or other defec ts that might affect their appearance or intended use. Use blanks conf orming to the Aluminum Association, Inc., requirements for commercial flatness and uniformi ty of thickness. Perform sheari ng, cutting, and punching before coating and applying reflective or other surface material.
3.Ensure that the sheared edges o f sign blanks are straight and free from tears or raggedness. Round corners unless the plans show otherwise. Ensure punched or dril led holes are round; free from tears, raggedness, and distor tion of the metal; and of the diameter an d location the plans show.
4.Degrease, etch, and coat the si gn blank on both sides with a c hromate treatment conforming to ASTM B921, class 2.
5.For other than stop signs, furn ish material that equals or exc eeds the following nominal thickness for the indicated sign width: WIDTH NOMINAL THICKNESS 30 inches a nd under .......................................................................................................... .................. 0.080 inch Greater than 30 through 36 inches ............................. ............................................................... .......... 0.100 inch Over 36 inches ............................................................................................................... ..................... 0.125 inch
6.For stop signs, furnish material that equals or exceeds the following nominal thickness for the indicated sign size: SIZE NOMINAL THICKNESS 24 inches x 24 inch es ........................................................................................................ .................. 0.080 inch 30 inches x 30 inch es ........................................................................................................ .................. 0.100 inch 36 inches x 36 inch es and l arger .............................. ............................................................... ............ 0.125 inch
637.2.2 Sign Face Materials
637.2.2 1 General
1.Sign sheeting material accept ance is subject to the performanc e criteria specified in 637.3.3.4 .
Referenced in this section
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Source: Wisconsin Standard Specifications for Highway and Structure Construction, 2019 Edition. Pages 427–428 of 601. View official source ↗