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

Conclusions

• 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.