A Demonstration of the Constructibility of a Precast Concrete Stay-in-Place Forming System for Lock Wall Rehabilitation
Abstract
One approach to minimizing the cracking problem in lock wall resurfacing is to use precast panels as stay-in-place forms. A precast panel rehabilitation system was designed by ABAM Engineers, Inc., in Phase I of a contract with the Waterways Experiment Station (WES). Phase II was a constructibility demonstration in which eight panels were present and erected on two one-half scale simulated lock wall monoliths at WES. The purpose of the demonstration was to evaluate the feasibility of the stay-in-place forming system without the risk and investment of undertaking a full-scale lock rehabilitation. The concrete form panels of varying sizes were precast in Colorado and shipped by truck to the installation site at WES. Typical lock hardware incorporated into the precast panels included horizontal armor, vertical corner armor, and a one-half scale line hook. One panel was essentially prototype size (6 ft by 30 ft) and weighed approximately 15,500 lb. Work associated with installation of the precast panels included surface preparation on the test monoliths, erection and alignment of the panels, and welding tie connections. The panels were attached to the test monolith with epoxy-grouted, weldable-grade reinforcing steel which was welded to steel plates embedded in the panels. All aspects of the installation are described herein, and a reassessment of the cost and schedule developed during Phase I is provided. As- built measurements are provided to demonstrate the ability of this repair procedure to meet the required tolerances. Improvements to the precast forming system that will benefit future work are identified, and additional features that require more research and final design have been noted.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1987
- Accession Number
- ADA195471