Tri-Deck

Tri-Deck girders are an adjustable top flange width, multi-stemmed unit designed for full deck use. Tri-Deck bridges are typically used for bridge spans from 30′-52′ which require a longer span and lower profile section. Typically Tri-Deck bridges are designed for Forest Service applications.

Span Length

Section Properties (gross)

HL-93 vehicle load, 52 ft. max. span (max. span is governed by handling. U-80 vehicle load, 46 ft. max span. Alternate loading or longer spans may be acceptable with engineer review.

Product Name	Depth (in)	Area (in2)	Yb (in4)	Ixx (in4)	Iyy (in4)	PLF @ 165
TD27 x 3'-11 3/4"	27"	680	16.38	42149	147283	781
TD27 x 4'-8"	27"	730	16.91	44969	178431	838
TD27 x 4'-9 1/4"	27"	737	16.98	45364	184075	846
TD27 x 5'-4"	27"	787	17.35	47374	219192	904
TD27 x 5'-7 1/4"	27"	797	17.51	48272	239077	915
TD27 x 5'-11 3/4"	27"	824	17.73	49449	270057	946

Product Information

Typical Tri-Deck height is set at 2′-3″ with a standard 6″ thick top flange adjustable in width from 48″ to 84″. The top flange can be thickened to accommodate design requirements, however, reducing the stem height is difficult and not cost effective.

Standard Design Options

Integral Precast Curbs
Utility inserts
Air Entrained Decks
Bolts or Sleeves for Guard Rail Post Connection
Precast End Diaphragms

Need More Info?

We Are Here to Help

Have a question, need a budget or detailed schedule? Knife River sales team is ready to discuss precast solutions for your project. Reach out to our staff below :

Eric Holje

Bridge Estimator

[email protected]

(509) 536-3323

Sam Jewell

Outside Sales Representative

[email protected]

(541) 221-8599

Product Family

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