Span Length

30′ 34′ 38′ 42′ 46′ 50′ 54′ Span Length TD27 x 3'-11 3/4" 30′ - 52′ TD27 x 4'-8" 30′ - 52′ TD27 x 4'-9 1/4" 30′ - 52′ TD27 x 5'-4" 30′ - 52′ TD27 x 5'-7 1/4" 30′ - 52′ TD27 x 5'-11 3/4" 30′ - 52′

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 NameDepth (in)Area (in2)Yb (in4)Ixx (in4)Iyy (in4)PLF @ 165
TD27 x 3'-11 3/4"27"68016.3842149147283781
TD27 x 4'-8"27"73016.9144969178431838
TD27 x 4'-9 1/4"27"73716.9845364184075846
TD27 x 5'-4"27"78717.3547374219192904
TD27 x 5'-7 1/4"27"79717.5148272239077915
TD27 x 5'-11 3/4"27"82417.7349449270057946
image

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.

image
image
image

Standard Design Options

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

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 :

Image's Andy Roberts

Andy Roberts

Outside Sales, ID & MT

phone

509.904.8610

Image's Nikolaus Mixon

Nikolaus Mixon

Outside Sales, OR

phone

541.257.7412

Image's Alex Sari

Alex Sari

Outside Sales, WA

phone

(509) 992-5614

 linkedin

LinkedIn

Product Family

See featured product related to Tri-Deck assemblies

All Products

AASHTO Girder

AASHTO sections are typically used for railroad, or other private entity, bridge construction when a standard wide flange (WF) girder section does not meet the project design criteria.  The top flange of AASHTO shaped girders is not as wide as standa...

View Product
AASHTO Girder

Box Beam

Box Beams are typically used for 80′-118′ bridge spans. The design allows for a typical 4′ width section to include integral voids which reduce the product weight and are often used when box depth and speed of construction are part ...

View Product
Box Beam

Bridge Substructure

Accelerated Bridge Construction utilizes precast bridge substructure products. Total precast abutments, bent caps, pile caps and wingwalls offer many advantages. They can be precast to precise specifications of the design in a plant controlled settin...

View Product
Bridge Substructure

Bulb I

The Bulb I (BI51, BI63 and BI75) is a less commonly used ODOT standard girder for medium to long length span bridges. It utilizes the BT section with the deck blocked in to achieve difficult site requirements such as heavy super elevations and vertic...

View Product
Bulb I

Bulb T

The Oregon Bulb-Tee (BT) girder is the preferred choice for most Oregon medium to long span bridges requiring a CIP deck. Bulb Tee precast/prestressed girders are typically used in spans from 60-185′ with significant loading.

View Product
Bulb T

Deck Bulb Tee

Deck Bulb Tee Girders combine a precast deck with the traditional I-Girder design. This design offers the advantage of an immediate driving surface, or alternatively, a roughened surface that allows for the addition of a secondary overlay or a Cast-I...

View Product
Deck Bulb Tee

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-Dec...

View Product
Tri-Deck

Voided-Solid Slabs

Voided Slabs are typically used for 15-85′ bridge spans but can be used in building applications where significant design loads are required. Voided slab design allows for a typical 4′ width slab to include integral voids which reduce the...

View Product
Voided-Solid Slabs

Projects

Commercial

Industrial

Institutional

Residential

Transportation