Palmetto Section 5 - SR-826/SR-836 Interchange. Miami, Florida
Services Provided by FINLEY:
- Pre-Bid Design and Technical Support for Proposal
- Bridge Concept Report
- Final Design and Contract Documents; including Load Rating
- Construction Engineering
- Technical Support During Construction
- First Use Of Diabolos
- External Post-Tensioning
- Use Of Pier Heads To Stabilize The Deck To Eliminate Temporary Supports
- Use Of Polystyrene In The Hollow Pier Columns
- Expansion Joints At Abutments
- 360,718 square feet of deck area.
- 7,763 linear feet of bridge.
- Longest span 266' and tallest pier 81 feet.
- Number of Segments 775.
FDOT District 6 - Project Site Report Photos:
Estimated completion date:
Specifications & Details
First Segment Erected for Palmetto Expressway Section 5 (32.2 KB)
Seeking Savings (1.1 MB)
Bd&e, Issue 61, November 2010
Project News: Palmetto Expressway, Section 5, Miami-Dade-County, FL (346.8 KB)
ASBI, SEGMENTS Newsletter, Winter 2011
This $558 million design-build-finance project involves the construction of an Interchange between SR 826 and SR 836, two limited access facilities, as well as the reconstruction of SR 826 at Flagler Street and SR 836 at NW 72nd Avenue interchanges. Capacity improvements include the reconstruction and widening along both SR 826 and SR 836, and the construction of 46 bridges. The project will provide new direct connector ramps for major improvements and collector-distributor ramps to eliminate existing geometric and operational deficiencies.
FINLEY is designing and providing the construction engineering on four high-level segmental bridge ramps (Bridge Nos. 9, 11, 15 and 19) that traverse the core of the interchange. The segmental bridge ramps will be precast, balanced cantilever and erected with a 460 ft. launching gantry. The bridge lengths vary from 1,100 ft. to 2,450 ft. in length and are 47 ft.-wide, with a maximum span length of 266 ft. The curved segmental bridge ramps are the third level of the interchange with radii down to 590 ft. and have a maximum superstructure deck height of 95 ft. above the proposed ground. All of the bridges are supported on 24” pile foundations and reinforced concrete piers and caps.
The design offers unique challenges integrating underlying roadways, canals and MOT requirements into the layout of these segmental bridge ramps. This project was constructed in the Miami International Airport flight path and had FAA Requirements. The high level segmental flyovers are built over multiple roads that carry 430,000 vehicles per day and are the tightest elevation curves erected in the United States. All overhead erection eliminated the need for falsework and cranes by eliminating 5 MOT that would have impacted traffic and also provided a safer work environment. FINLEY integrated the design into the construction while satisfying the strong aesthetic requirements. The design reduced maintenance and construction costs with design of external tendons, diabolos and deviators. The use of polystyrene in the hollow pier columns, except at the base of the caps, eliminated the need for interior formwork and reduced the overall mass of the structure and concrete required.
SR826-SR836 Interchange Construction as of 11_28_2012 as seen looking East & South from the SouthWest corner of the project. by Robert Holmes http://gigapan.org/gigapans/119093