Effective with the December 2018 Letting 435 2019 Standard Spec ifications Section 641 Sign Bridges and Overhead Sign Supports
641.1 Description
1.This section describes providi ng zinc coated steel sign bridge s and overhead sign supports.
641.2 Materials
641.2.1 General
1., Furnish zinc coated steel sign structures.
641.2.2 Steel Bolts 641.2.2.1 High-Strength Bolts
1.Furnish zinc-coated type 1 bolt/nut/washer assemblies for fiel d tensioning conforming to 506.2.5 and as follows: - Use the size, number, type, and configuration of hardened fla t washers the DTI manufacturer recommends for bolt diameters great er than 1 1/8 inches. - Ensure that the supplier pre-assembles each bolt/nut/washer a ssembly before shipping. - Ensure that bolt/nut/washer assemblies are accompanied by a certified report of test o r analysis giving the results of the supplier's rotati onal-capacity testing. No field rotational-capacity testing is required. - Ensure that bolt/nut/washer assemblies are shipped in sealed and labeled containers. - Furnish 3 or more additional bolt/nut/washer assemblies of ea ch rotational-capacity lo t for pre-installation testing. - Submit 2 or more additional bo lts and 3 or more additional nu ts and washers from each lot and heat for department mechanical testing. T he contractor need not submit c omponents from a lot and heat the department previously approved.
641.2.2 2 Direct Tension Indicating Washers
1.Furnish zinc-coated direct tens ion indicating (DTI) washers co nforming to ASTM F959 type 325. Ensure that DTIs have identifyi ng marks applied by the manufacturer. Provide the engineer with 2 copies of the DTI manufacturer's instructions showing acceptable installation configurations. Provide 3 or more additional DTIs as required for pre-installation testin g. Also provide the engineer with at least two 0.005-inch metal feeler gauges.
641.2.2 3 Anchor Rods
1.Furnish anchor rods conforming to ASTM F1554 , grade 55 and Supplementary Specification S4, ASTM A563 heavy hex nuts, and ASTM F436 washers all hot-dip galvanized according to ASTM A153, class C, supplemented by ASTM F2329. Over-tap galvanized nuts according to ASTM F2329.
2.Use only nuts and anchor rods manufactured with sufficient clearance to allow the nuts to run freely on the rods after coating the thre ads and nuts with a wax-based lu bricant.
641.2.3 Grating
1.Provide walkway grating conforming to the plans.
641.2.4 Pipe
1.Provide pipe for handrail conforming to ASTM B241 alloy 6063-T6.
641.2.5 Steel Chain
1.Provide zinc coated carbon st eel chain of the size, type, and length the plans show and include accessories the plans show.
641.2.6 Certification
1.Submit a certified report of te st or analysis to the engineer for the castings, columns, truss members, pipes, anchor rods, high-strength bolts, nuts, and washers, and structural sections. The engineer must approve the material before the c ontractor may install in the w ork.
2.The engineer may retest materials delivered to the job site; f urnish the specimens for this testing at no expense to the department. 641.2.7 Aluminum Components
1.Furnish extruded aluminum for handrails conforming to ASTM B221, alloy 6061-T6. Furnish aluminum structural shapes for catwal k supports conforming to ASTM B308, alloy 6061-T6. Furnish plate and sheet aluminum conforming to ASTM B209, alloy 6061-T6. Ensure material is free from d iscoloration, nicks, and blemishes.
2.Furnish stainless steel U bol ts, bolts, nuts, and washers for connections to aluminum components conforming to 513.2.1 . Effective with the December 2018 Letting 436 2019 Standard Spec ifications 641.2.8 Steel Sign Bridges
1.Furnish materials conforming to the following: Structural Steel and Mi scellaneous Metals ..................... ............................................................................. 506.2
2.Furnish sign bridge trusses, c olumns, and steel accessories zinc coated according to ASTM A123, the zinc coating must withstand 8 one-minute dips in the Preece tes t solution, ASTM A239. Revise 641.2.8 to clarify submittal requirements and re quire steel sign bridges from a fabricator on the APL.
3.Ensure that steel sign bridges a re fabricated by an approved fa bricator selected from the department’s APL. Also ensure that the fabricator submits a fabrication progres s report on department form DT2334 electronically to the department’s fabrication library. Update this form weekly for each sign bridge in fabrication.
641.2.9 Overhead Sign Supports
1.Provide commercially fabricated overhead sign supports conform ing to the edition of AASHTO design specifications and fatigue categor y the plans show in the overh ead sign support layout details. Revise 641.2.9(2) to allow non-tapered poles and arms unl ess the plans show otherwise. This change was implemented in ASP 6 effective with the December 2017 letting.
2.Provide steel pole shafts, mas t arms or trusses, and luminaire arms zinc coated according to ASTM A123. The contractor may provide either straight or tapered pole and arm shafts unless the plans specify otherwise. Provide bolts and other hardware conforming to 641.2.2 . Revise 641.2.9 to clarify submittal requirements & require overhead sign supports from a fabricator on the APL.
3.Ensure that overhead sign supports are fabricated by an approve d fabricator selected from the department’s APL. Also ensure that the fabricator submits a fabrication progres s report on department form DT2334 electronically to the department’s fabrication library. Update this form weekly for each overhead sign support in fabrication.
4.Submit shop drawings identified by structure number, design com putations, and material specifications to the engineer conforming to 105.2 with electronic submittal to t he fabrication library under 105.2.2 . Certify that shop drawings confor m to quality control standards by submitting department form DT2326 with each set of shop drawings. Provide tightening procedures fo r mast arm or luminaire arm to pole shaft connections on the shop drawings. Hav e a professional eng ineer registered in the state of Wisconsin sign, seal, and date the shop drawings and certify th at the design conforms to AASHTO standards and the contract.
641.3 Construction
641.3.1 General 641.3.1.1 Methods
641.3.1 2 High-Strength Bolts 641.3.1.2.1 Handling and Storage
1.Store bolts/nut/washer assemblies and DTIs in closed container s in a protected shelter to protect them from dirt and moisture until us ed. Maintain fastener system components as nearly as possible in the as-manufactured condition until installed. Remove from storage only as needed and pr omptly return unused components to storage.
641.3.1 2.2 Pre-installation Testing
1.Notify the engineer before perform ing the required field pre-installation testing.
2.Lubricate high-strength bolt thr eads with a wax-based lubrican t before testing. Test bolt/nut/washer assemblies with DTIs in all the configurations used for installation.
3.Perform pre-installation testi ng in the field conforming to th e procedures enumerated in department form DT2322 for bolt/nut/washer assemblies of each rotational-capacity lot with DTIs in each Effective with the December 2018 Letting 437 2019 Standard Spec ifications installation configuration. Provide the engineer with the test results by submitting 2 copies of department form DT2322 .
641.3.1 2.3 Bolt Installation
1.Do not begin bolt installation without the engineer's approval .
2.Lubricate high-strength bolt thr eads with a wax-based lubrican t before installation.
3.Tension high-strength bolts usi ng DTIs. Install the DTI on the bolt with the protrusions facing away from the connected materials. Install bolt/nut/washer assemblie s with DTI washers in the same configuration used for pre-installation testing.
4.Tighten conforming to department form DT2322 to provide the correct insta llation tension. During the operation, ensure no rotation o f the part not turned by the wrench. Snug systematically from the most rigid part of the connection to the free edges. Repeat until th e full connection is in a snug condition and the faying surfaces are in firm contact. Systematically tig hten the connection required number of refusals is achieved. If the gaps on the DTI are completely clo sed, discontinue tightening.
5.Perform QC testing as specified in 506.3.12.3.3.3 for tensioning with DTIs. A fter observing at the initial QC testing frequency, the engineer may decide to observe QC tes ting at a reduced frequency. The engineer may verify bolt installation by periodically testing w ith a feeler gauge.
641.3.1 3 Anchor Assembly
1.Install structures on anchor rods conforming to the procedures enumerated in department form DT2321 . Complete department form DT2321 for each structure. Indicate t he parties resp onsible for the installation and submit t he form to the engineer for inclus ion in the permanent project record.
641.3.1 4 Sign Installation
1.Install permanent signs as soon as support structures are erec ted. If permanent signing is not available, install sign blanks to control vibration. Fasten to the supporting struct ure conforming to
637.3.3 3 .
2.For overhead sign supports, ensure that sign blanks are the sa me sizes and at the same locations as the permanent signs.
3.For sign bridges, attach sign blanks to a minimum of 1/4 the t russ length near its center. Use sign blanks that are at a minimum 24 inches larger than the truss de pth and project an equal distance beyond the top and bottom chord members.
4.Install structure identificati on plaques on overhead sign supports and sign bridges in the locations the plan details show.
641.3.2 Steel Sign Bridges 641.3.2.1 General
1.Under the Sign Bridge Single Pole Sign Support One Sign bid it ems, furnish and erect single pole sign supports with attachments for signs facing in one direction.
2.Under the Sign Bridge Single Pole Sign Support Two Signs bid i tems, furnish and erect single pole sign supports with attachments for signs facing in opposite dir ections.
3.Under the Sign Bridge Cantileve red bid items, furnish and erec t cantilevered sign bridges with a single supporting structure.
4.Under the Sign Bridge Structure Mounted bid items, furnish and erect sign bridges mounted on overhead roadway bridges.
5.Under the Sign Bridge bid item s, furnish and erect sign bridge s with multiple supporting structures.
641.3.2 2 Welding
1.Perform shop welding for steel sign bridges and supports as th e plans show and conforming to AWS D 1.1, Structural Welding Code - Steel.
2.Do not weld in the field without the engineer's written approv al. The engineer will only allow field welding for repairs in noncritical locations and when a departm ent-approved individual competent to perform inspections is present during the welding. Perform fiel d welding using personnel qualified under AWS D 1.5, Bridge Welding Code.
3.Inspect welds visually, additi onally, if the engineer determin es, test butt welds in main, stress-carrying members subject to tension or str ess reversal by radiographic o r ultrasonic methods over the entire length of the weld. Test other butt welds in these members by t he same methods, except the engineer will determine the length of weld to test. Use either the dye p enetrant method, or the magnetic particle method to test the fillet welds connecting columns to bases and main chord members, including the associated flanges, gussets, or main load carrying brackets or members, and on fillet welds Effective with the December 2018 Letting 438 2019 Standard Spec ifications connecting flanges to the main truss chord members. Perform the dye penetrant test according to ASTM E165 and perform the magnetic par ticle method according to ASTM E709.
4.Shop weld aluminum catwalk supports and handrails conforming t o AWS D 1.2, Structural Welding Code - Aluminum. Do not weld aluminum in the field.
641.3.2 3 Fabrication
1.Blast clean and then zinc coa t the fabricated sign bridge trus ses, columns, and their steel accessories after completing cutting, punching, drilling, and welding.
2.After zinc coating, assemble the individual members making up the truss sections, unless fabricated and zinc coated in one piece in t he shop, adjust to the proper shape and alignment, and tighten the high-strength bolts to the require d tension. Provide a certific ate of compliance certifying that high- strength bolts within truss sections are tensioned conforming t o 506.3.12 . Then, assemble the truss sections that make up any one sign bridge in the shop, and adju st to proper alignment and camber as the plans show. Matchmark all tru ss sections and shims before d isassembling for shipment.
641.3.2 4 Handling and Field Assembly
1.Protect zinc coated members fr om damage to the zinc coating during transportation, storage, and erection. Paint areas of damaged zinc coating with 2 coats of z inc dust/zinc oxide paint. Clean damaged and adjacent areas by sanding, scraping, chipping, or wire brushing. Apply a profile to the bare metal surface using a needle gun before painting. For areas of damage larger than 10 square inches metalize according to AASHTO M36 or, for field repairs, using an engineer-approved high- temperature application of zinc powder and flux in paste or sti ck form.
2.Assemble the sections making up the truss, together as a single unit, before attaching to the columns.
641.3.3 Overhead Sign Supports
1.Under the Overhead Si gn Support bid item, fu rnish and erect co mmercially designed sign supports fabricated from steel. Construct according to the shop drawings .
641.4 Measurement
1.The department will measure the Sign Bridge bid items as a sin gle lump sum unit for each sign bridge acceptably completed.
2.The department will measure the Overhead Sign Support bid item s as a single lump sum unit for each overhead sign support acceptably completed.
641.5 Payment
1.The department will pay for measured quantities at the contrac t unit price under the following bid items: ITEM NUMBER DESCRIPTION UNIT 641.0100 Sign Bridge Si ngle Pole Sign Supp ort One Sign (structu re) LS 641.0600 Sign Bridge Single Pole S ign Support Two Signs (struct ure) LS 641.1200 Sign Bridge Cantile vered (structure) LS 641.5100 Sign Bridge Structure Mounted (structure) LS 641.6600 Sign Bridge (structure) LS 641.8100 Overhead Sign Support (structure) LS
2.Payment for the Sign Bridge bid items is full compensation for providing sign bridges; for anchor assemblies and templates; for high-strength bolt/nut/washer ass emblies and DTIs including those required for testing; and for sign blanks. Concrete footings ar e paid for separately under 636.5 .
3.Payment for the Overhead Sign S upport bid items is full compen sation for designing the sign support structure; for provid ing the sign support; for excavating and backfilling; for providing concrete footings including reinforcing steel; for providing anchor assemblies an d templates; for high-strength bolt/nut/washer assemblies and DTIs including those required fo r testing; and for sign blanks.
642.1 Description
1.This section describes furnishing, placing or erecting, equipping, and maintaining field offices and field laboratories as required in the contract at engineer-approved l ocations.
642.2 Materials
642.2.1 General
1.Provide field offices and field laboratories that are mobile, house-type trailers, or houses, or other engineer-approved types that are floored, roofed, and weatherpr oofed, and have a minimum ceiling height of 6 feet-9 inches.
2.Equip these facilities with suit able artificial lighting and adequate heating equipment along with the necessary fuel to maintain a mini mum temperature of 68 F during the hours occupied.
3.Provide and maintain an adequat e supply of bottled drinking water.
4.Provide and maintain suitable interior or exterior sanitary facilities conforming to State and local health requirements, in clean and good working condition, and stock wi th sanitary supplies for the duration of the contract.
5.Supply a first aid kit in each field office and field laborato ry provided under the cont ract. Ensure the kits are readily accessible to proje ct personnel. Check the contents of each kit at least once each week and replenish expended items. Ensure each kit contains, at a mi nimum, a supply of latex or nitrile gloves, CPR masks, adhesive tape , pressure and cling bandages, antiseptic wipes, bite/sting swabs, cold packs, and safety goggles.
6.For situations that may expose the eyes or body of a worker to corrosive or potentially harmful materials, provide emergency use facilities capable of flushing the eyes, or drenching the body of an exposed worker with water for 15 minutes.
7.Provide at least 4 windows, posit ioned for cross ventilation, and equipped with required locks and screens. Securely fasten heavy screening over all windows. Use screening made of No. 2 mesh, 14- gauge or heavier, steel wire clot h, zinc coated after weaving.
8.Equip with a 6-pound or larger fire extinguisher conforming to class A, B, and C of the NFPA Code.
9.Equip the exterior doors with heavy-duty clasps bolted through the door and jamb with heavy-duty padlocks. 642.2.2 Field Office
642.2.2 1 General
Revise 642.2.2.1 to require a dditional technology to support in creased remote access & printing needs in the field. This change was implemented in ASP 6 effective with the December 2017 letting.
1.Provide each field office with two rooms, separated by an inte rior door with a pad lock. Ensure that each room has a separate exteri or door and its own air conditio ner. Locate the office where a quality internet connection can be achieved.
2.Provide local and long distance telephone service for exclusive department use that has the following: - Two programmable touch-tone phones, one of which is cordless. Ensure that phone operations will not interfere with other telecommunications equipment. - Voice mail service or an answering machine.
3.Provide unlimited high-speed inte rnet service for exclusive dep artment use via cable or DSL connection with a modem/router and capable of supporting cloud enabled file sharing, voice over internet protocol (VoIP), video conferencing, and web based app lications. Ensure that system meets the following: - Includes a wireless netwo rk for the field office. - Can accommodate IPSec based VPN products. - Has a bandwidth range as follows: Field office with 1-5 staff: A minimum connection speed of 5 Mbps download and 1 Mbps upload. If a cable or DSL option is not available the contractor may provide a personal hotspot using cell phone tethering or other device able to achieve the specified mini mum speeds inside the field o ffice. Field office with 6 or more staff: A minimum connection speed of 10 Mbps + 1/2 Mbps per user download and 5 Mbps upload.
Referenced in this section
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Source: Wisconsin Standard Specifications for Highway and Structure Construction, 2019 Edition. Pages 444–447 of 601. View official source ↗