Abstract: A foundation for a tall vertical structure, such as a wind turbine installation, features anchor bolts having a grout cap slid over the anchor bolt, where the grout cap has a flared skirt which seals against the open annulus formed by the anchor bolt and its accompanying PVC sleeve, where the top of the PVC sleeve is generally flush with the bottom of the grout trough. The grout cap extends from its bottom which abuts the bottom of the grout trough, up and extending at least partially into a bolt hole in the tower flange. A method of protecting anchor bolts utilizing the grout cap is also described.

Abstract: A foundation for a tall vertical structure, such as a wind turbine installation, features anchor bolts having a grout cap slid over the anchor bolt, where the grout cap has a flared skirt which seals against the open annulus formed by the anchor bolt and its accompanying PVC sleeve, where the top of the PVC sleeve is generally flush with the bottom of the grout trough. The grout cap extends from its bottom which abuts the bottom of the grout trough, up and extending at least partially into a bolt hole in the tower flange. A method of protecting anchor bolts utilizing the grout cap is also described.

Abstract: The anchor bolt cap for placement over an anchor bolt and nut assembly has an anchor bolt nut enclosure with bottom and top sides, a tubular anchor bolt enclosure member with bottom and top ends, and an end cap with a closed top side and an open bottom side. The distance between the tubular anchor bolt enclosure member bottom and top ends is variable. The tubular anchor bolt enclosure member top end is connected to the end cap open bottom side, and the bottom end is connected to the anchor bolt nut enclosure top side. The anchor bolt nut enclosure bottom side can have a groove containing an o-ring, or a bottom flange member with a groove containing an o-ring. The anchor bolt nut enclosure top side can have a flange. The connection means can be thermal or chemical welding, or mating threads.