Old River Overbank Structure Forces on Panel Gates: Hydraulic Model Investigation
Abstract
The Old River overbank control structure will consist of 73 spillway bays, each 44 ft wide, separated by 2-ft-thick piers, and is designed to pass a discharge of about 495,000 cfs. The weir is to be a modified broad crest, flow over which will be controlled by 15 wood timber panel gates in each bay hinged to the superstructure at the top by two pins. The panels will be raised and lowered by the cable of a crane on the superstructure. Tests conducted on a 1:8-scale model of the panel gates indicated that the maximum tangential force perpendicular to the gate was 18,500 lb. This force is equivalent to a 26,000-lb cable load if the lift-cable angle is 45 degrees. The actual lift-cable stresses measured agreed with computed results, thus verifying the accuracy of the design procedure used. The maximum hinge-pin stress was 40,300 lb, recorded on the left pin of the center panel when panels 1-7 were in a raised position and panels 9-15 were closed. In general, the panels tended to float at the larger openings. The horizontal, jump-type stilling basin, with two rows of 5-ft baffle piers, was also studied in the model. Stilling basin action under maximum discharge was improved by relocation of the baffle piers farther downstream and closer together.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1959
- Accession Number
- ADA637641