808.01 DESCRIPTION. Furnish and install steel grid flooring. Steel grid
flooring may contain sections filled with concrete.
808.02 MATERIALS. Materials shall comply with the following:
Paint and Protective Coatings Section 811 Portland Cement Concrete Section 901 Metals Section 1013 Use Class A1 concrete with Grade F aggregate for concrete filled steel grid floors. Unless otherwise specified, steel grid flooring shall be hot-dipped galvanized.
808.03 FABRICATION. Before fabrication or construction is undertaken,
submit shop drawings and erection drawings in accordance with 801.05. Fabricate in accordance with the plans and specifications. Deviations will not be permitted without approval of the Bridge Engineer. Provide the DOTD Fabrication Engineer at least 30-days advance written notice of the beginning of work at the mill or shop so that inspection may be provided. No material shall be manufactured or work done in the shop before shop drawings have been accepted and before the DOTD Fabrication Engineer has been notified.
808.04 Facilities for Inspection.
Furnish facilities for inspection of material and workmanship in the mill and shop as described in 807.04.2.
808.05 Storage of Materials.
Store steel grid flooring as specified in 807.04.1.
808.06 Straightening Material.
If straightening is necessary, straighten using methods that will not damage the metal.
808.07 Arrangement of Sections.
Where main support elements are normal to the centerline of roadway, extend the grid floor units over at least three supports for the full width of roadway for roadways up to 40 feet. Where transverse joints are required, place joints over supports. Where longitudinal joints are required, shear transfer devices shall be provided in accordance with the plans. Where main support elements are parallel to the centerline of roadway, extend the grid floor units over at least three supports for the full width of the roadway for roadways up to 40 feet. Where longitudinal joints are required, place joints over supports. Where transverse joints are required, provide shear transfer devices in accordance with the plans. Attach trim plate at all free edges of the grid floor panels in accordance with the plans.
808.08 Provision for Camber.
Shop camber grid flooring as required for final required camber for the installation. Provide full contact between the grid floor bearing bars and the supporting surface.
808.09 Field Assembly.
In order to provide the best riding surface and transition between panels, assemble the largest possible areas of grid flooring before welding or connecting to its supports. Make main elements continuous and connect sections along their edges by welding. Connections will be subject to approval.
808.10 Connection To Supports.
Connect the floor to its steel supports by welding. Before welding, either load the floor to make a tight joint with full bearing or clamp down. Location, length, and size of welds will be subject to acceptance of the Bridge Engineer, but in no case shall they be less than the manufacturer’s standards. Securely fasten ends of main steel members of the slab together at the sides of the roadway for the full length of span by steel plates or weld angles to ends of main members. Do not weld grid flooring to the steel bridge rail at the gutter line.
808.11 WELDING. Comply with Section 809 for shop and field welding.
Comply with the approved method and location of field welding as shown on the shop drawings. Remove galvanized coatings prior to welding grid floors to support members.
808.12 Protective Coating.
Unless otherwise specified, hot dips galvanize the steel grid floor in accordance with Section 811. Repair galvanized coatings after welding.
808.13 Concrete Filler.
When specified, place concrete filler in the open grid. Use galvanized metal forms. Floor types with bottom flanges not in contact shall be provided with bottom forms of metal to retain the concrete filler. Fit metal forms tightly on bottom flanges of floor members and place in short lengths extending only about 1 inch onto the edge of each support. In all cases forms shall provide for adequate bearing of the slab on the support. Consolidate the concrete by vibrating the steel grid floor. The vibrating device and manner of operating it will be subject to approval.
808.14 Measurement.
The quantity of steel grid flooring for payment will be the design area as specified on the plans. Concrete for filling steel grid flooring will not be measured for payment.
808.15 Payment.
Payment for steel grid flooring will be made at the contract unit price per square foot, which includes furnishing, fabricating and installing all materials, including, but not limited to, base plates, trim angles, trim plates, galvanizing or other coating (if required), and all welding, bolting, and connections. Payment will be made under: Item No. Pay Item Pay Unit 808-01 Steel Grid Flooring (Type) Square Foot
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