SECTION 948 — STEEL SIGN STRUCTURE
948.1 DESCRIPTION —
This work is the construction of overhead steel sign structures of the type indicated.
948.2 MATERIAL —
(a) Cantilever, Centermount, or Span with Single Plane Truss.
Columns, Struts, and Truss Chords — Section 1105.02(j)
Truss Webs and Truss Verticals — ASTM-A53, Butt Welded.
Other Structural Members — Section 1105.02(a)
(b) Span with Box Shaped Truss.
Pipes or Tubular Sections — ASTM-A53, Type E or S, Grade B; or ASTM-A501 or A252, Grade 2.
Structural Bars, Plates, and Shapes — AASHTO-M270 (ASTM-A709), Grade 36.
(c) Rigid Frame Span.
Chord Members — Section 1105.02(j), unless otherwise indicated.
Tubular Webs and Tubular Verticals — ASTM-A53, Butt Welded.
Steel Angles, Shapes, and Plates — Section 1105.02(a)
Section 1105, except identify on the shop drawings weld locations, type, size, process and nondestructive testing. Shielded metal arc welding (SMAW), submerged arc welding (SAW), gas metal arc welding (GMAW), and flux cored arc welding (FCAW) are approved. Radiographic test groove welds. Galvanize, as specified in Section 1105.02(s).
(e) Anchor Bolts.
Plate washers for anchor bolts, AASHTO-M270 (ASTM-A709), Grade 36, except identify weld locations on the shop drawings.
(f) Class A Cement Concrete.
(h) Reinforcement Bars.
(i) U-Bolts, Straight Bolts (other than High Strength Bolts), and Washers.
ASTM-A276, Type 304
ASTM-A276, Type 303
High Strength Bolts.
Bolts, nuts, and washers - Section 1105.02(d) 1, 2 and 3.
Bolt dimensions — AASHTO, Division II Section 184.108.40.206, and the requirements for Heavy Hexagon Structural Bolts, ANSI B18.2.1.- Circular washer dimensions, AASHTO, Division II Section 220.127.116.11, and no raised markings on bearing surfaces of washers.
When directed, furnish bolts, nuts, and washers for testing purposes.
(m) Bedding Material for Bridge Shoes.
948.3 CONSTRUCTION —
As indicated, as shown on the Standard Drawings and as follows:
Submit detailed shop drawings for review and acceptance. Material and workmanship not previously inspected will be inspected on the work site. Remove rejected material from the work site. Satisfactorily restore the site to its original condition, as directed, including the disposal of excess or unsuitable material.
Excavate and construct the foundations. Construct the foundations of Class A Cement Concrete, as specified in the applicable parts of Section 1001.3.
Use templates to accurately set tower base anchor bolts to the correct elevation and alignment. Securely brace the bolts against displacement before concrete is placed.
After constructing the concrete foundations, backfill the excavation around the foundation using acceptable material, in uniform loose layers, not exceeding 4 inches in depth. Compact by means of acceptable mechanical tampers to the required density.
(c) Bearing Areas.
tower base bearing areas of concrete pedestals, in a true and level position. Full bearing is required under bases. Place bedding material for bridge shoes.
(d) Cantilever and Centermount Structures.
Adjust cantilever and centermount structures, after the sign panels and lighting are installed, to make the signs level.
When required, provide suitable allowance for expansion, for structures mounted between concrete walls. At expansion points on such structures, hand-tighten the nuts on U-bolts, then install jam nuts.
948.4 MEASUREMENT AND PAYMENT —
(a) Steel Sign Structures.
Includes removal of existing signs.
(b) Class 3 Excavation.
(c) Class A Cement Concrete.
(d) Reinforcement Bars.
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