CATEGORY 400 STRUCTURES SECTION 433 — BRIDGE MOUNTED SIGN SUPPORTS
433.01 Description
Furnish and construct bridge mounted sign support and sign luminaire supports. This work does not include sign panels, electrical work, or luminaires. References to Grade 50W structural steel shall be construed to include similar structural steel having weathering characteristics.
433.02 Materials
Epoxy Grout 902.11(d) Structural Steel 909.01 Anchor Bolts, Nuts, and Washers 909.06 High Strength Bolts, Nuts, and Washers 909.07 Paint 912.05, Paint System B On new structures, construct the sign support using the same structural steel and fasteners used for the fabrication of the structure. When A709, Grade 50W structural steel is used, make the vertical supports from material meeting A709, Grade 36 or Grade 50. On existing structures, use structural steel meeting A709, Grade 36 or Grade 50 for the sign support. When the existing structure consists of A709, Grade 50W structural steel, construct the sign support from steel meeting A709, Grade 50W, except make the vertical supports from steel meeting A709, Grade 36 or Grade 50. Use fasteners meeting 909.07 and use Type 3 when used with A709, Grade 50W. Galvanize vertical supports for the sign panels according to A123. Hot dip galvanize all bolts, nuts, and similar fasteners in contact with the galvanized material, meeting the thickness, adherence, and quality requirements of A153.
433.03 Construction
Construct the sign support according to the applicable portions of Section 430. Paint according to Section 435, except as specified herein. Set the anchor bolts by epoxy grouting or casting in place when applicable. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS On new structures, clean and paint the nongalvanized portions of the sign support using the same system specified for the structure. Clean and paint portions of the sign support mounted on structures constructed with Grade 50W steel and attached to areas designated to be painted. On existing structures not constructed with Grade 50W steel, either the entire sign support may be galvanized or those areas not designated to be galvanized may be painted. Refer to Section 435 for cleaning and painting nongalvanized portions of the sign support. Blast clean to a surface condition of Near White SSPC SP 10 prior to painting. Unless otherwise specified, refer to 436.03.25 for repair of damaged coatings on existing structures. Portions of the sign support mounted on existing structures constructed with Grade 50W steel and attached to areas that are painted shall also be cleaned and painted.
433.04 Measurement and Payment
Bridge Mounted Sign Supports will not be measured but will be paid for at the Contract lump sum price. The payment will be full compensation for all material, labor, equipment, tools, and incidentals necessary to complete the work. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 435 — CLEANING AND PAINTING NEW STRUCTURAL STEEL CATEGORY 400 STRUCTURES SECTION 435 — CLEANING AND PAINTING NEW STRUCTURAL STEEL
435.01 Description
Clean and paint new structural steel used for work such as new construction, deck widening, and repairs that require installation of new structural steel. When the existing steel is not scheduled for repainting, this work will include repairing existing coatings damaged during the Contractor’s operations and areas where new steel ties into existing steel. When the existing steel is scheduled for repainting, refer to Section 436. When the new or existing steel is prepared by abrasive blast cleaning in the field, refer to Section 436 for containment and environmental monitoring requirements.
435.01.01 Areas to be Coated. Areas of shop cleaning and priming, and field cleaning and
painting pertain to the following surfaces:
a.Nonweathering Steel - All surfaces. Refer to 436.01.01(a). (b) Weathering Steel.
1.The outside facing surfaces of the fascia stringers for all structures over roadways and for structures over water that contain curb openings. For dual structures, this includes the median fascia. These surfaces include the underside of the top flange, the web facing away from the structure, the top of the bottom flange, the outside edge of the bottom flange, the underside of the bottom flange, the inside edge of the bottom flange, and the top of the bottom flange on the inside facing surface up to and including the fillet weld. A sharp well defined transition between the new paint on the flange and the bare steel above the fillet is not required. Overspray onto the web is acceptable. All attached bearings are included in the cleaning and painting.
2.At abutments, the end 10 ft of all stringers and all other structural steel within the 10 ft area (e.g., stiffeners, cross bracing, and bearings).
3.At piers, 10 ft in each direction from the center line of the pier (giving a total length at each pier of 20 ft) and all other structural steel within the area.
4.At bolted field splices, 12 in. beyond the longest splice plate for each particular splice and all splice material. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 499–500 of 1,113.