BRIDGE DRAIN MODIFICATION
PART 1 GENERAL
1.1SECTION INCLUDES
A.Frame riser to raise the existing deck or approach slab drain grate to
match the grade of the asphalt surfacing.
B.Deck drain pipe extension.
C.Deck drain closure.
1.2RELATED SECTIONS
A.Section 03055: Portland Cement Concrete
B.Section 03211: Reinforcing Steel and Welded Wire
1.3REFERENCES
A.AASHTO M 111: Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel
Products
B.AASHTO M 235: Epoxy Resin Adhesives
C.AASHTO M 270: Structural Steel for Bridges
D.AWS D1.1 Structural Welding Code – Steel
E.ASTM A 53: Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and
Seamless
F.ASTM F 1554: Anchor Bolts, Steel, 36, 55, and 105-ksi Yield Strength
G.American Institute of Steel Construction (AISC)
Bridge Drain Modification
1.4DEFINITIONS Not Used
1.5SUBMITTALS
A.Certified Mill Test Report (MTR) for all structural steel, seven calendar
days before fabrication, including materials manufactured outside of the United Sates for information.
1.Provide item number and name on all material submittals.
2.Clearly indicate country of origin on MTR.
B.Manufacturer’s AISC Bridge Component Certification (CPT) for
information.
C.Welding procedure specifications meeting AWS D 1.1 for information.
PART 2 PRODUCTS
2.1STRUCTURAL STEEL
A.Use structural steel plates and angles according to AASHTO M 270,
Grade 36.
B.Use steel pipes according to ASTM A 53, Grade B.
C.Galvanize the frame riser, extension pipe, and any required attachment
hardware after fabrication according to AASHTO M 111.
2.2ANCHOR BOLTS
A.Refer to ASTM F 1554.
2.3FABRICATION
A.Refer to AWS D1.1.
2.4DOWELED ANCHORS
A.Use post-installed anchors. Refer to Section 03211.
2.5CONCRETE
A.Class AA(LS) concrete, unless specified otherwise. Refer to Section
03055.
Bridge Drain Modification
PART 3 EXECUTION
3.1PREPARATION
A.Verify plan dimensions for the existing grate system before fabricating the
new frame riser.
B.Verify location and dimensions of the existing deck drain system before
fabricating the new drain pipe and fittings.
3.2INSTALLATION
A.Deck Drain or Approach Slab Drain Modification
1.Construct the frame riser as shown.
2.Place new frame riser before placing asphalt surfacing.
a.Plate compact the asphalt surfacing and slope the asphalt
surfacing in the areas surrounding the frame of the drain.
3.Position the grate properly to receive the water flow. Line up grate
ribs with water flow for square or rectangular frames.
B.Deck Drain Pipe Extension
1.Construct steel pipe drainage system as shown.
2.Connect steel pipes to existing deck drains.
a.Provide continuous weld around perimeter of pipe
connection so that no water can escape through the connection.
3.Fasten steel pipe to the abutment or bent using doweled anchors
as shown.
C.Deck Drain Closure
1.Use a steel plate with a minimum thickness of 3/8 inch or a concrete
plug as shown before placing new asphalt surfacing.
3.3CLEANING
A.Clean all debris and trash from the drain basin and grate ribs.
END OF SECTION
Bridge Drain Modification
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Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 391–393 of 1,331.
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