Sign Support – Breakaway Art. 727.03
725.05 Basis of Payment. This work will be paid for at the contract unit price
per each for OBJECT MARKER - TYPE 1, TYPE 2, TYPE 3, or TYPE 4; TERMINAL MARKER - DIRECT APPLIED; or TERMINAL MARKER – POST MOUNTED. SECTION 726. MILE POST MARKER ASSEMBLY
726.01 Description. This work shall consist of furnishing and installing a
milepost marker at the location specified in the plans.
726.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Sign Legend, Type 1 ............................................................................... 1091
b.Metal Posts and Hardware for Highway Markers, Signs, and Delineators ....................................................................... 1006.29
c.Sign Face ............................................................................................... 1091
726.03 Basis of Payment. This work will be paid for at the contract unit price
per each for MILE POST MARKER ASSEMBLY. SECTION 727. SIGN SUPPORT – BREAKAWAY
727.01 Description. This work shall consist of furnishing and installing
galvanized structural steel breakaway sign supports or galvanized hollow structural steel tubular breakaway sign supports and stub posts.
727.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Structural Steel .................................................................................. 1006.04
b.Structural Steel Supports ................................................................... 1093.01
c.High Strength Steel Bolts, Nuts and Washers ............................... 1006.08(b) Hollow structural steel tubing shall be according to ASTM A 500 (Grade B) or ASTM A 501. All other structural steel shapes and plates shall be according to AASHTO M 270 (M 270M). Shims shall be fabricated from stainless steel shim stock according to ASTM A 240 (A 240M), Type 302 or 304. CONSTRUCTION REQUIREMENTS
727.03 General. Sign locations shall be staked by the Contractor and
approved by the Engineer prior to installation of sign supports and structures. The Contractor and the Engineer together shall determine the exact lengths, sizes, and locations required before ordering the supports to be fabricated. Art. 727.03 Sign Support – Breakaway Breakaway sign posts and breakaway tubular sign posts shall be according to the plans, and the AASHTO LRFD Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals. The steel sign supports shall be fabricated and inspected according to Articles 505.03 through 505.05. All fabrication shall be completed and ready for assembly before galvanizing. No punching or drilling shall be permitted after galvanizing. The slot and 5/8 in. (16 mm) diameter hole in the web and the fuse plate bolt holes in the flange shall be made before galvanizing. The post flange shall be saw cut after galvanizing and bare metal surfaces shall be coated with an approved zinc solder or zinc-rich paint. These surfaces shall not be coated until the fuse plate is installed and all bolts fully tightened. After fabrication, the post, fuse plate, base plate, and upper 6 in. (150 mm) minimum of the stub post shall be galvanized by the hot-dip process according to AASHTO M 111. The sign supports shall be erected in a vertical position on stub posts previously cast into the foundations. The faces of the supports shall be flush with the sign throughout the contact area. The supports shall be plumbed and brought to final grade. The top of the supports shall be set within 2 in. (50 mm) of, but not above, the top of the sign when installed at the height specified. When two or more sign supports are required for any sign, the supports shall be erected parallel to each other. Shims may be used between the plates to level posts. Posts shall be assembled to stubs with high strength bolts and washers as detailed on the plans. The bolts in the base plate shall be tightened in a systematic order to the required torque. Each bolt shall be loosened and tightened to the required torque in the same order as the initial tightening. Threads at the junction of the bolt and nut shall be burred or center punched to prevent the nut from loosening.
727.04 Welding. All welding shall be continuous and according to
Article 505 — 04(q).
727.05 Tightening. All friction fuse bolts shall be tightened in the shop as
approved by the Engineer and according to the current “Specification for Structural Joints Using High-Strength Bolts” and one of the following methods. Telescoping Steel Sign Support Art. 728.02
1.Turn-of-Nut Tightening
2.Tightening by use of a Direct Tension Indicator Tightening shall obtain the following minimum residual tension on each bolt. Min. Residual Bolt Tension Min. Residual Bolt Tension Bolt Dia. lb (kN) Bolt Dia. lb (kN) 1/2 in. (M12) 12,050 (54) 7/8 in. (M22) 39,250 (175) 5/8 in. (M16) 19,200 (85) 1 in. (M24) 51,500 (229) 3/4 in. (M20) 28,400 (126) 1 1/8 in. (M27) 56,450 (251) 1 1/4 in. (M30) 71,700 (319)
727.06 Foundations. Sign support foundations shall be cast-in-place
according to Section 503.
727.07 Method of Measurement. This work will be measured for payment in
pounds (kilograms) of structural steel sign support erected in place. The measurement of the structural steel shall be computed on the basis of the weight (mass) per foot (meter) of the support, multiplied by the combined length of the main posts and stub posts. The measurement of the tubular steel shall be computed on the basis of the Post Weight (Mass) Calibration Table shown on the plans for the main posts installed, plus the weight (mass) of the stub posts. No allowance will be made for the weight (mass) of the welds, either shop or field, and for the galvanizing. No deduction will be made for cuts, copes, or holes.
727.08 Basis of Payment. This work will be paid for at the contract unit price
per pound (kilogram) for STRUCTURAL STEEL SIGN SUPPORT-BREAKAWAY or TUBULAR STEEL SIGN SUPPORT-BREAKAWAY. Concrete foundations will be paid for according to Article 734.05 SECTION 728. TELESCOPING STEEL SIGN SUPPORT
728.01 Description. This work shall consist of furnishing and installing
telescoping steel sign supports for ground-mounted signs utilizing a telescoping base section or a previously installed cast iron base.
728.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Structural Steel Supports, Telescoping .......................................... 1093.01(c) CONSTRUCTION REQUIREMENTS Art. 728.03 Telescoping Steel Sign Support
728.03 General. The estimated length of a support includes the total length of
all required sections. When two or more posts support the same sign, they shall be erected parallel to each other with the tops of the posts at the same elevation. The sign locations shall be staked by the Contractor and approved by the Engineer prior to installation of the posts. The Contractor shall be responsible for the proper elevation, offset, and orientation of all signs as indicated in the plans or as directed by the Engineer. When the support specified is too long, the Contractor may choose to cut the top section or telescope the top section farther into the base section. Any section cut shall have the cut end completely deburred. When signs are to be placed on adjacent post sides and the posts have holes in only two opposite sides, the Contractor shall drill any additional holes necessary to the tolerances according to Article 1093.01(c). The top section may be spliced. Splicing shall be done according to the plans and will only be permitted in the upper third of the top section. Only one splice per support will be permitted. The internal splice member shall be 1 3/4 x 1 3/4 in. (45 x 45 mm).
728.04 Installation Methods. Installation methods shall be as follows.
a.Pavement Mount. Pavement mounted installation shall be used only in paved areas and shall consist of three sections as shown in the plans. The base sections may be installed before or after the paving operation, except a hole no greater than 6 in. (150 mm) in diameter shall be cut in the pavement. Any pavement removed shall be neatly replaced around the base section with like material to the depth of the original pavement. The 2 1/4 x 2 1/4 in. (57 x 57 mm) base section shall be driven by hand or mechanical means to a minimum depth of 34 in. (850 mm) measured from the pavement surface. The top of the base section shall be protected by a suitable driving cap. When required by the Engineer, the earth around the support shall be compacted after driving. The sleeve section shall be telescoped over the base section or may be driven with the base section as a unit. The tops of both sections shall be at the same elevation, with the bolt holes aligned. The 2 x 2 in. (50 x 50 mm) top section shall be telescoped into the base section a minimum of 8 in. (200 mm) and a maximum of 12 in. (300 mm) and the three sections fastened together as shown in the plans.
b.Ground Mount. Ground mounted installations shall consist of two sections as shown in the plans. The 2 1/4 x 2 1/4 in. (57 x 57 mm) base section shall be driven by hand or mechanical means to a minimum depth of 5 ft (1.5 m) measured from the ground line or as shown in the plans. The top of the base section shall be protected by a suitable driving cap. When required by the Engineer, the earth around the support shall be compacted after driving.
Referenced in this section
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 656–659 of 1,217. View official source ↗