00930.01 911 Section 00930 - Metal Sign Supports
Description
00930.00Scope - This Work consists of furnishing, fabricating, galvanizing, and erecting metal sign
supports.
00930.01Definitions :
90 Degree Rotational Sign Supports - The compl ete Structure is composed of post stubs, base plates, posts, rotator connection, sign support members, and fasteners, but does not include the sign support footings.
Adjustable Sign Mounts - The complete support is adjustable horizontally and vertically t o facilitate signal pole mast arm and pole mounting of flat sign sheets. The bracket consists of cast aluminum and galvanized steel elements, stainless steel straps, and fasteners.
Bridge Structure Mounts - The W -shapes or special detailed attachments us ed for mounting signs to Bridge Structures and maintenance walkways, and includes all necessary support brackets, arms, and fasteners, but does not include sign illumination Equipment . Exit Number Sign Mounts - The S -shape, spacers, special mounting brack ets, and fasteners, necessary to install the exit number signs.
Major Sign Supports - This group includes Truss Sign Bridges, Monotube Sign Bridges, Butterfly Sign Structures, and Monotube Cantilever Sign Structures.
Mast Arm Street Name Sign Mounts - This group includes the frame members, attachment channel or bracket, steel bands or cables, and fasteners necessary to install a street name sign on a signal mast arm.
Minor Sign Supports - This group includes Multi -Post Breakaway Sign Supports, Triangular Base Breakaway Sign Supports, Pipe Breakaway Sign Supports, Perforated Steel Square Tube Slip Base Sign Supports, 90 Degree Rotational Sign Supports, Pipe Sign Supports, and Perforated Steel Square Tube Anchor Sign Supports.
Multi -Post Breakaway Sign Supports - The complete Structure is composed of post stubs, base plates, posts, hinges, sign support members, and fasteners, but does not include the sign support footings.
Pipe Sign Supports and Perforated Steel Square Tube Anchor Sign Supports - The complete Structure is composed of metal post, sign support members and fasteners, but does not include the sign support footings.
Secondary Sign Mounts - This group includes tubes, S -shapes, channels, plates, and fasteners necessary to install secondary signs.
Signal Pole Mounts - The complete support including horizontal and vertical arms, supporting brackets, and fasteners. Triangular Base Breakaway Sign Supports, Pipe Breakaway Sign Supports, and Perforated Steel Square Tube Slip Base Sign Suppor ts - The complete Structure is composed of post stub, base plates, metal post, sign support members, and fasteners, but does not include the sign support footings.
00930.02 912 Truss Sign Bridges, Monotube Sign Bridges, Butterfly Sign Structures and Monotube Cantilever Sign Structures - The complete Structure is composed of base plates, support columns, cantilever arms, trusses, horizontal beam, sign support arms, supporting brackets, fasteners, and maintenance walkways, but does not include the sign illumination Equipment and sign support footings.
Vertical Sign Mounts on Existing Structures - The additional or replacement vertical members and fasteners necessary to install a new sign onto an existing major sign support.
00930.02Working Drawings - Submit six copies of unstamped Working Drawings according
to 00150.35 for all structural metal Work . Submit six copies of stamped designs, details, Plans , and calculations according to 00150.35 for all engineered de tails and drawings that are not prepared by the Agency but are required by the Contract Documents and Specifications for the Project prior to fabrication. Include the Field Verification of Post Lengths form for Major Sign Supports, available from the Engi neer. M aterial ordered or Work performed before the Engineer finishes and returns the documents shall be at the Contractor's risk. In addition to the Working Drawings , submit six copies of all available data including manufacturer's pamphlets and brochures, technical bulletins, Working Drawings and other technical information relative to products used on the Project. After installation, submit corrected Working Drawings that represent the Material as installed and in operation. Include sufficient inform ation to enable the Agency's maintenance forces to replace all or part of the commercially manufactured sign Structures, under routine or emergency maintenance, by direct reference to the information furnished by the Contractor.
Working Drawings are not r equired for the following types of steel supports:
• Multi -Post Breakaway Sign Supports • Triangular Base Breakaway Sign Supports • Signal Pole Mounts • Exit Number Sign Mounts • Secondary Sign Supports • Route marker frames
Working Drawings for these supports will be provided by the Engineer. Use the Field Verification of Post Lengths form, available from the Engineer, to provide the necessary site data for the engineer of record to use in producing Working Drawings . Work performed, or Materials ordered, before receiving Working Drawings from the Engineer shall be at the Contractor’s risk . Submit working drawings according to 00150.35 for the following types of steel supports for intelligent transportation systems:
Multi -Post Break away Sign Supports Triangular Base Breakaway Sign Supports Signal Pole Mounts Secondary sign supports Include the completed Field Verification of Post Lengths forms that are available from the Engineer for these i ntelligent transportation systems supports. Material ordered or work performed before receiving approved Working Drawings from the Engineer will be at the Contractor's risk.
00930.40 913 00930.09 Identifying Tags - Overhead and butterfly sign support Structures, except structure mounts, shall have stainle ss steel or brass identifying tags attached to all posts, arms, and truss sections. The tags shall be at least 1/16 inch thick. Tag lettering shall be at least 1/4 inch in height, and shall be stamped into the tag. Tags shall be attached with stainless steel pop rivets of at least 3/16 inch nominal body diameter. Do not locate pop rivet holes within 6 inches of welds. Post tag shall be located approximately 5 feet above the baseplate. Holes for pop rivets shall be drilled prior to hot -dip galvanizing. Remove excess hot -dip galvanizing from holes and repair according to ASTM A780. Tags shall include the following information:
• Structure number • Manufacturer • Month and year of manufacture • Highway number and mile point
Materials
00930.10Materials - Furnish Perforated Steel Square Tube Slip Base Sgn Supports and Perforated
Steel Square Tube Anchor Sign Supports from the QPL. Furnish other structural steel Materials meeting the applicable portions of Section 02530, with weights and sizes as shown or specified. Furnish galvanized bolts, nuts, hardened washers, and direct tension indicators meeting the requirements of Section 02560, except the rotational capacity test of 02560.60(a) does not need to be repeated at the Project Site for Minor Sign Supports. Except for Perforated Steel Square Tube Slip Base Sign Supports and for Perforated Steel Square Tube Anchor Sign Supports, galvanizing shall conform to the requirements of Section 02530. Galvanize Perforated Steel Square Tube Slip Base Sign Supports and Perforated Steel Square Tube Anchor Sign Supports according to ASTM A653 G90, zinc coat corner seam weld after scarfing, apply a conversion coating, and apply a final clear polymer coating.
Furnish Monotube Cantilever Sign Structures and Monotube Sign Bridges meeting the requirements of one of the following:
ASTM A53 Grade B ASTM A500 Grade B or C ASTM A501 Grade A or B API Specification 5L PSL2 Grade B, Grade X42, Grade X4 2M, Grade X52, or Grade X52M. Thermomechanical rolled or thermomechanical formed (grade suffix M) pipe is designated as X42M and X52M and are Group 2 materials in the TPA -IBS-98 for bend qualifications.
Labor
00930.30Fabricators - Fabricators of metal sign supports shall have either a current AISC Simple
Steel Bridge Structures (Sbr) certification or a current AISC Major Steel Bridges (Cbr) certification.
Construction
00930.40Fabrication and Erection - Fabricate and erect according to the applicable portions of
vertical. 00930.40 914 Where two or more posts are required to support a sign, orient and position both posts so that no twist or warp will be imparted to the sign panels.
Handle the material carefully so that no parts will be bent, broken or otherwise damaged. Clean bearing surfaces and surfaces to be in permanent contact before the members are assembled. Roughen faying surfaces of slip-critical structural connections utilizing high strength bolts by means of hand wire brushing after galvanizing. Power wire brushing is not allowed.
Faying surfaces of plates shall be flat to within a tolerance of 1/32 inch in 12 inches and a tolerance of 1/16 inch overall. Base plates with leveling nuts shall be flat to within a tolerance of 1/8 inch in 12 inches and a tolerance of 3/16 inch overall.
AWS D1.1, prequalified welds for complete joint penetration (CJP) are not allowed. Qualify CJP welds according to AWS D1.1. Perform V -notch (CVN) testing according to the following: • Grade 36 ksi material with a plate thickness less than or equal to 4 inches - The CVN Impact Energy minimum is 25 ft -lbs at 40 °F. • Grade 50 ksi material with a plate thickness less than or equal to 2 inches - The CVN Impact Energy minimum is 25 ft -lbs at 40 °F. • Grade 50 ksi material with a plate thickness greater than 2 inches and less than or equal to 4 inches - The CVN Impac t Energy minimum is 30 ft -lbs at 40 °F.
The fabricator shall inspect welds according to the details and requirements called out on the Contract Documents. This requirement will override all appropriate weld inspection requirements called out in Section 5.15 WELDED CONNECTIONS in AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals . Submit all Procedure Qualification Records, Welding Procedure Specifications, and testing procedures for Engineer's review prior to starting manufacturing. Submit certified copies of inspection reports to the Engineer for review.
If requested by the Engineer, additional weld inspection may be required upon arrival of the material at the Project Site . If defects are found by this additional inspection, the Contractor shall be responsible for the additional testing and repair costs. If no defects are found, the Engineer will be responsible for the additional inspection costs.
be reused, if approved, but not more than once. Retightening previously tightened bolts that may have been loosened by the tightening of adjacent bolts will not be considered a reuse. Provide all high strength bolts with hardened washers under the element (nut or bolt head) turned in tightening. If a high strength bolt is installed in an oversized or short slotted hole in an outer ply, use a hardened washer. If a high strength bolt is instal led in a long slotted hole in an outer ply, use a plate washer or a continuous bar made of structural grade steel at least 5/16 inch thick with standard holes. Make the washer or bar sufficiently large to completely cover the slot after installation. Protect fasteners from dirt and moisture at the Project Site . Do not remove the lubricant that is present in as -delivered condition.
00930.40 915 (1) Bolt Installation for Slip Bases (Breakaway) - Furnish, at no additional cost to the Agency, a calibrated torque wrench of a capacity appropriate to the size of the high-strength bolts installed and tightened. Confirm the accuracy of the calibrated torque wrench through calibration by an approved testing agency at least once a year.
Remove any dirt and moisture from the lubricated anchor rods , and recoat the lubricated fasteners with a fresh, second coat of lubricant to the bolt threads and bearing surfaces that turn during installation according to 02560.70 immediately before tightening. Tighten the bolts, in the presence of the Engineer, to the minimum torque or tension shown to seat the bolts in the base plate slots. After all the bolts in the slip base are tightened, loosen each bolt and retighten to the prescribed torque or tension shown in the same order as the ini tial tightening.
tension indicator method unless noted otherwise. The calibrated torque wrench method of final tightening is not acceptable. Use of direct tensi on indicators is not allowed with Type 3 high- strength bolts in AASHTO M 270, Grade 50W ( ASTM A709, Grade 50W; ASTM A588), unpainted weathering steel connections.
washers at each bolt. Install so that the direct tension indicator protrusions are in contact with a hardened washer. Bring the connection to a snug -tight condition. Snug- tight is defined as the condition when all plies of the connection are in firm conta ct and can be attained by applying the full effort of a worker on the end of a 12-inch long wrench to each bolt in the connection. Tighten all fasteners in the connection by progressing systematically from the most rigid part of the connection to the free edges in a manner that will minimize relaxation of previously tightened fasteners. In some cases, proper tensioning of the bolts may require more than a single cycle of systematic partial tightening.
After attaining a snug -tight condition, tighten all fasteners in the connection by progressing systematically from the most rigid part of the connection to the free edges until the direct tension indicator spaces between the protrusions refuse entry of a 0.005 inch feeler gauge in all spaces except one. "Cheater" bars, multiplier wrenches, or impact wrenches are allowed. Provide impact wrenches with enough capacity and supplied air to tighten each bolt in 10 seconds or less. Do not use a slugging wrench or similar method for final tightening.
the most rigid part of the connection to the free edges. Tighten all bolts until they are simultaneously snug tight and the connection is fully compacted. Snug tight is defined as the tightness that exists when all plies of the joint are in firm contact. This may be attained by a few impacts of an impact wrench or the full effort of a worker using a 12 inch long wrench. Following this initial operation, further tighten a ll bolts in the connection by the amount of rotation specified in Table 00560-3 in Section 00560. During the tightening operation do not permit rotation of the part not turned by the wrench.
Engineer will observe the installation and tightening of bolts to determine that the selected tightening procedure is properly used and that all bolts are tightened, and in the case of direct tensi on indicators that the correct indication of tension has been achieved. Bolts may reach tensions substantially above the value given in Table 00560-1, but this will not be cause for rejection. The installation will be rejected if the geometry does not satisfy the requirements of
02560.05
00930.41 916
Upon completion of a bolted joint, the Engineer will determine that all bolts have been tightened. A minimum of 10 percent, but not less than two bolts in each joint, will be in spected. T he joint will be accepted as properly tightened when one open space allows entry of a 0.005 inch feeler gauge. If there is more than one space between the direct tension indicator protrusions that allow entry of a 0.005 inch feeler gauge, re-inspect all bolts , retighten bolts in the joint as required, and resubmit the joint for inspection. If no spaces exist between the direct tension indicator protrusions that allow entry of a 0.005 inch feeler gauge, replace bolt assembly, tighten bolts in the joint as required, and resubmit the joint for inspection. For connections with all bolts fully tightened, one bolt at a time may be replaced without providing crane support of the mast arm.
are acceptable by the Inspector , no additional bolt tightening inspection is required. If turn-of -nut tightening has been performed without being witnessed by the Inspector , use the fol lowing inspection procedure:
• In the presence of the Engineer, use an inspection wrench, which may be a calibrated torque wrench. • Place three bolts of the same grade, diameter and condition as those under inspection individually in a calibration device capable of indicating bolt tension. Use a hardened washer under the part turned in tightening each bolt. • Tighten each bolt specified in the paragraph above in the calibration device by any convenient means to an initial condition equal to 20 percent of the r equired tension, and then to a tension not less than 5 percent greater than specified for its size in Table 00560-1 in Section 00560. Tightening beyond the initial condition shall not produce greater nut rotation than 1.5 times that allowed in Table 00560-3 in Section 00560. Then apply the inspecting wrench to the tightened bolt and determine the torque necessary to turn the nut or head 5 degrees, approximately 1 inch at 12 inches radius, in the tightening direction. Take the average torque measured in the tests of three bolts as the job inspecting torque to be used in the manner specified in the next paragraph. • Test bolts that have been tightened in the Structure and are represented by the sample prescribed above with the inspecting wrench. Apply t he job inspecting torque to 10 percent of the bolts, but not less than two bolts selected at random. If no nut or bolt head is turned by this application of the job inspecting torque, the connection will be accepted as properly tightened. If any nut or bolt head is turned by the application of the job inspecting torque, test all bolts in the connections. Retighten all bolts whose nut or head is turned by the job inspecting torque, and re-inspect. Retighten all of the bolts in the connection and then resubmit the connection for the specified inspection.
to TPA-IBS-98 Recommended Standards for Induction Bending of Pipe and Tube . Provide written bend qualifications that include bending procedures, essential variables, material group, and destructive testing results. Destructive testing results shall include yield strength, tensile strength, and elongation at locations indicated in Table 2-1 of the TPA -IBS-98.
00930.41Adjustable Sign Mounts - The mount shall allow vertical adjustment for positioning the
sign and shall rotate to plumb the sign. Use galvanized or stainless steel nuts, bolts and washers for fasteners.
Measurement
00930.80Measurement - No measurement of quantities will be made for metal sign supports
00930.90 917 Estimated quantities of structural steel will be listed in the Special Provisions. If field verified post lengths increase or decrease by more than 25 percent of the length specified, adjustments to the Contract lump sum amount will be made according to 00190.10(h).
Payment
00930.90Payment - The accepted quantities of metal sign supports will be paid for at the Contract
unit price, per unit of measurement, for the following items:
Pay Item Unit of Measurement Major Sign Supports
Mounts
Minor Sign Supports
Payment will be payment in full for furnishing and placing all Materials, and for furnishing all Equipment , labor, and Incidentals necessary to complete the Work as specified.
No separate or additional payment will be made for route marker frames, wind bracing, pole clamps, stainless steel clamps, Mast Arm Street Name Sign Mounts, or special sign brackets.