Strengthening the walls of the No. 8 lock of the Moscow Canal by prestressed anchors

Abstract

1. Overhaul of reinforced-concrete lock walls, in which such consequences of long and deep aging as sustained movements of the top of the walls into the chambers occurred, is a completely feasible task with the use of prestressed anchoring. 2. Heavy reinforcing of the reinforced-concrete walls and crowded conditions of conducting the works are not an obstacle (with the correct approach) for drilling anchor holes and tensioning the anchors. 3. The technology of anchoring with removable heads, including combining the two methods of creating prestressing — “against stops” and “against concrete,” is efficient and reliable. Such technology provides reliable fastening of the reinforcement being tensioned in a stretched state and permits conducting works under crowded conditions, where there is no room for placing the heads being left or the tensioning jack. Furthermore, such a method makes it possible to save expensive parts of the heads, using them many times. 4. The complexity of works on prestressed anchoring requires for conducting them the enlistment of specialized construction organizations possessing reliable technologies and having skilled personnel. 5. Gidroproekt's technology was sufficiently perfected, which provided a high technical effect from its use for strengthening the walls of the No. 8 lock with a high productivity of labor and a high quality of the works. 6. This technology can be used successfully also in many other cases, when it is required to repair old concrete and reinforced-concrete structures as well as stone masonry structures, where such signs of aging as through cracks and slow progressive movements of their separated parts appeared.