Section 4187.� Materials for Sign Support Structures
4187.01���� general requirements.
Furnish materials for aluminum alloy or galvanized steel sign support structures meeting the following requirements:
A.��� Materials for Aluminum Alloy Superstructures.
1.���� Extruded Tubes.
Apply ASTM B 221/B 221M, Alloy 6061-T6.
2.���� Aluminum Plate.
Apply ASTM B 209 B/209M, Alloy 6061-T6.
3.���� Aluminum Casting Components.
a.���� Apply ASTM B 26/B 26M, Alloy 356.0-T7, for components in which welding is involved.
b.���� Apply ASTM B 26/B 26M, Alloy B 514.0 Temper F, for handrail pipe fittings.
c.���� Apply ASTM B 26/B 26M, Alloy 356.0-T7, or Alloy B 443.0 Temper F, to all other aluminum castings.
4.���� Aluminum Structural Shapes.
Apply ASTM B 308/B 308M, Alloy 6061-T6.
5.���� Aluminum Catwalk Gratings.
a.���� Longitudinal (Bearing) Elements.
Apply ASTM B 221/F 221M, Alloy 6061-T6. Other aluminum alloys will be considered for approval.
b.���� Transverse (Cross) Elements.
Apply ASTM B 221/B 221M, Alloy 6063-T5. Other aluminum alloys will be considered for approval.
6.���� Aluminum Pipe.
Apply ASTM B 241/B 241M, Alloy 6063-T5.
7.���� Aluminum Weld Wire for Welding Electrodes.
Use AWS A5.10 electrode ER5356 or ER5556 when welding aluminum alloy 6061.
B.��� Materials for Galvanized Steel Superstructures.
Use the type and quality specified in the contract documents.
C.��� Fasteners for Aluminum Alloy and Galvanized Steel Superstructures and Anchor Bolts.
1.���� Fasteners for Aluminum Superstructures.
a.���� Stainless Steel Bolts and Studs.
1)��� Use the size specified in the contract documents.
2)��� Comply with ASTM A 320/A 320M Class 1 Grade B8, Class 1A Grade B8A, or Class 2 Grade B8; or ASTM F 593 Group 1 Alloy 304 or 304L, Group 2 Alloy 316 or 316L, or Group 3 Alloy 321 or 347 meeting Condition A, CW1 or CW2.
3)��� Use hexagonal bolt heads. Threads are to comply with ANSI/ASME B1.1 for UNC thread series, Class 2A tolerance. Use the stress area to compute the tensile strength.
b.���� Stainless Steel Nuts and Jam Nuts.
1)��� Use the size specified in the contract documents.
2)��� Comply with ASTM A 194/A 194M Grade 8, 8A, 8C, 8CA, 8M, 8MA, 8T, or 8TA; or ASTM F 594 Group 1 Alloy 304 or 304L, Group 2 Alloy 316 or 316L, or Group 3 Alloy 321 or 347 meeting Condition A, CW1 or CW2 Use same alloy properties (i.e. group, alloy, class and condition) as those of the bolts specified.
3)��� Use hexagonal nuts and jam nuts. Threads are to comply with ANSI/ASME B 1.1 for UNC thread series, Class 2B tolerance.
4)��� Unless otherwise specified, use dimensions in accordance with the requirements of ANSI/ASME B 18.22.2.�
c.���� Stainless Steel Washers.
1)��� Comply with ANSI B18.22.1 for the bolts specified.
2)��� The Engineer may approve washers with dimensions other than those specified.
3)��� Meet requirements of ASTM A 240/A 240M. Use same alloy properties (i.e. group, alloy, class and condition) as those of the bolts specified.
d.���� Stainless Steel U-Bolts.
1)��� Use the size specified in the contract documents.
2)��� Comply with ASTM A 320/A 320M, Class 1A Grade B8, Class 1A Grade B8A, or Class 2 Grade B8; or ASTM F 593 Group 1 Alloy 304 or 304L, Group 2 Alloy 316 or 316L, or Group 3 Alloy 321 or 347 meeting Condition A, CW1 or CW2.
3)��� Threads shall comply with ANSI/ASME B 1.1 for UNC thread series, Class 2A� tolerance.
4)��� Use nuts as specified in Article 4187.01, C.1.b.
5)��� Use washers as specified in Article 4187.01, C.1.c.
2.�� Fasteners for Galvanized Steel Superstructures.
a.���� Galvanized Steel High Strength Bolts.
1)��� Use size specified in the contract documents.
2)��� Galvanize according to requirements of ASTM B 695, Class 55 Type 1 or ASTM F 2329 with zinc bath temperature limited to 850�F (455�C).
3)��� Bolts shall be ASTM A 325 Type 1 or ASTM A 449 Type 1.
4)��� Threads are to comply with ANSI/ASME B 1.1 for UNC thread series, Class 2A tolerance.
b.���� Galvanized Steel Nuts and Jam Nuts.
1)��� Use size specified in the contract documents.
2)��� Galvanize according to the requirements of ASTM B 695, Class 55 Type 1 or ASTM F 2329 with zinc bath temperature limited to 850�F (455�C).
3)��� Regular nuts shall be ASTM A 563 Grade DH heavy hex.
4)��� Jam nuts shall be ASTM A 563 Grade DH heavy hex.
5)��� Threads are to comply with ANSI/ASME B 1.1 for UNC thread series, Class 2B tolerance.
c.���� Galvanized Steel Washers.
1)��� Comply with ANSI B18.22.1 for the bolts specified.
2)��� Galvanize according to the requirements of ASTM B 695, Class 55 Type 1 or ASTM F 2329 with zinc bath temperature limited to 850�F (455�C).
3)��� Washers shall be ASTM F 436 Type 1.
d.���� Galvanized Steel U-Bolts.�
1)��� Use size specified in the contract documents.
2)��� Galvanize according to the requirements of ASTM B 695, Class 55 Type 1 or ASTM F 2329 with zinc bath temperature limited to 850�F (455�C).
3)��� U-bolts shall be ASTM A 449 Type 1, ASTM A 307 Grade B or ASTM F 1554, Grade 36 or 55.
4)��� Threads are to comply with ANSI/ASME B 1.1 for UNC thread series, Class 2A tolerance.
5)��� Bend and thread U-bolts prior to galvanizing.
e.��� Stainless Steel U-Bolts.
1)�� Use size specified in the contract documents.
2)�� Comply with ASTM A 320/A 320M Class 1 Grade B8, Class 1A Grade B8A, or Class 2 Grade B8; or ASTM F 593 Group 1 Alloy 304 or 304L, Group 2 Alloy 316 or 316L, or Group 3 Alloy 321 or 347 meeting Condition A, CW1 or CW2.
3)��� Threads are to comply with ANSI/ASME B 1.1 for UNC thread series, Class 2A tolerance.
4)��� Use nuts as specified in Article 4187.01, C, 1, b.
5)��� Use washers as specified in Article 4187.01, C, 1, c.
�3.��� Anchor Bolts, Nuts, and Washers.
Meet the following requirements:
a.���� Anchor Bolts.
1)��� Use full-length galvanized bolts.
2)��� Comply with ASTM F 1554, Grade 55, S1 or Grade 105, S5 as specified.
3)��� Threads are to comply with ANSI/ASME B1.1 for UNC thread series, Class 2A tolerance.
4)��� The end of each anchor bolt intended to project from the concrete is to be color coded to identify the grade.
5)��� Do not bend or weld anchor bolts.
b.���� Nuts.
1)��� Comply with ASTM A 563, Grade DH.
2)��� Use heavy hex.
3)�� Use ANSI/ASME B1.1 for UNC thread series, Class 2B tolerance.
4)��� Nuts may be over-tapped according to the allowance requirements of ASTM A 563.
c.���� Washers.
Comply with ASTM F 436 Type 1.
d.�� Galvanizing.
Galvanize entire anchor bolt assembly (anchor bolt, nuts and washers) according to the requirements of ASTM B 695, Class 55 Type 1 or ASTM F 2329 with zinc bath temperature limited to 850�F (455�C). Galvanize entire assembly by the same zinc-coating process, with no mixed processes in a lot of fastener assemblies.
D.��� Material for Substructure.
1.���� Concrete Footings.
Use Class C concrete meeting applicable requirements of Section 2403.
2.���� Reinforcing Steel.
Apply Section 4151.
1.���� Substructure.
Use one of the following:
� Rigid steel conduit meeting the requirements of Article 4185.10, B,
� Rigid plastic conduit meeting the requirements of Article 4185.10, D, or
� Bituminized fiber conduit meeting the requirements of FZS W-C-581, Type II.
2.���� Superstructure.
a.���� Use rigid steel conduit meeting the requirements of Article 4185.10, B, when the structure is fabricated from steel.
b.���� Use aluminum alloy conduit when the structure is fabricated from aluminum alloy.