Determine and provide the necessary temporary bracing to ensure lateral stability of prestressed, precast concrete girders during erection and placement of the diaphragms and deck. Do not remove temporary bracing until the deck is placed and the diaphragms have attained 80 percent of ultimate design strength. 502.4.21 Rejection of Precast Members 1 The department may reject precast members if, upon removal of the forms, there is
cracking, honeycombing, air pockets, sand streaks, or other evidence of imperfect mixing or casting or because of failure to meet requirements of these specifications at the fabrication plant or job site.
502.5MEASUREMENT and PAYMENT
1 The engineer will measure:
×
ft [mm] by the foot [meter].
foot [meter] from end of girder to end of girder for each prestressed precast member supplied. 2 The department will pay as follows:
Pay Item
Pay Unit
Measure to the Nearest
Pay to the Nearest
Precast Box Culverts × × ft [mm] Precast Concrete Members Prestressed Precast Conc Bulb-T in [mm] Prestressed Precast Conc I-Girder in [mm]
FT [m]
0.1 ft [0.05 m]
FT [0.5 m]
LS
LS
LS
FT [m]
0.1 ft [0.05 m]
FT [0.5 m]
FT [m]
0.1 ft [0.05 m]
FT [0.5 m]
Prestressed Precast Conc Tri-Deck in [mm]
FT [m]
0.1 ft [0.05 m]
FT [0.5 m]
430
Bridge Railing
503.1DESCRIPTION
1 This section describes the requirements for constructing steel bridge railing, pedestrian
railing, and bridge railing modifications.
503.2MATERIALS
1 Provide materials in accordance with the following:
Material
Subsection
High Strength Bolts and Fasteners Bridge Railing Galvanized Coating High Strength Anchor Bolts
815.2 815.9 815.14 815.18
2 Use an adhesive anchorage system approved by the Bridge Program.
503.3EQUIPMENT—Vacant
503.4CONSTRUCTION
503.4.1 General 1 Fabricate and construct bridge railing in accordance with Section 501, Structural Steel.
503.4.2 Fabrication 1 Ensure that venting and pick-up holes in rails and sleeves are shown on the fabricator’s
shop drawings. Place vent holes on the underside of the rail members as installed. 2 Ensure that post base plates are flat after fabrication. 3 Shop-curve rail members for curved bridges with a radius of less than 1000 ft [300 m]. 4 Grind rough edges on posts and rails smooth before galvanizing.
Galvanize railing and hardware in accordance with Subsection 501.4.1.25, Galvanizing. Straight or unwelded tubes may be galvanized before fabrication, provided that cut surfaces are repaired in accordance with Subsection 501.4.1.25, Galvanizing. In addition to the requirements of AASHTO M 111 or ASTM A123, ensure that the galvanizing is free of general roughness, dross pimples, blisters, and wet storage stain.
431
Bridge Railing