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CLIENT
- U.S. Army COE, Rock Island District;
Rock Island, IL
PROJECT
- Locks 22 and 25 Guidewall Design;
Illinois and Missouri
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The U.S. Army Corps of Engineers turned to Stanley Consultants and their specialty consultant, INCA Engineers, when it came time to construct a 600’ extension of Mississippi River Locks 22 and 25 in Illinois and Missouri. The design team prepared a Design Documentation Report (DDR) for guidewall beams, bearing pads and expansion joints. Guidewall consists of three 9'' high by 8'6" wide beams stacked three high and support at 125' intervals by concrete-filled steel cans. Beams are precast, post-tensioned reinforced concrete. The design, which incorporated a thin shale layer over limestone at Lock 22 and sand at lock 25, reflected both economy (least weight) and durability. Construction procedure recommendations provided for completion of the project with minimum impacts on navigation. A quality control plan addressed quality production, internal quality control, design checks and independent technical reviews.
PROJECT FEATURES
Provisions were incorporated into beam design for wall armor and keyways. PZ sheetpile skirt was used to control water flow perpendicular to the guidewall and connected to the lowest beam.
Optimized two beams designs were based on these loads in appropriate combinations:
- Self-weight of beam
- Barge impact
- Lower limit barge impact loads
- Upper limit barge impact loads
- Uplift
- Uniform ice load
- Ice expansion load
- Live load
- Hawser pull
- Wind load
- Stream flow load
- Earthquake load (seismic load according to AASHTO highway bridge analysis)
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