DD2 Portal Crane and Tunnel Repairs

Provide various infrastructure upgrades to the dry dock #2 area at Portsmouth Naval Shipyard (PNS) to increase the function and reliability of the ground level portal crane rails and adjacent facilities. The proposed upgrades are divided into two separate projects that will be awarded together: Dry Dock 2 Portal Crane Rail Repairs, and Dry Dock 2 Tunnel Repairs. The Dry Dock #2 Portal Crane Rail Repair upgrades will increase the capacity of the ground level portal crane rails at the North and East sides of Dry Dock #2. Major work elements include: demolition of existing crane rails, baseplates, hardware, footings, beams, and pile caps; installation of micro piles; installation of reinforced concrete pile caps, beams, and footings; installation of crane rail, baseplates, and hardware; site grading, drainage improvements, and pavement restoration within the project limits. The Dry Dock #2 Tunnel Repair upgrades will demolish and reconstruct the personnel access tunnel at the east side of Dry Dock 2, including integral and adjacent ground level portal crane rails and footings. Major work elements include; temporary re-routing of electrical, communication, and mechanical utilities; selective demolition of reinforced concrete personnel access tunnel, and crane rail footings; rock excavation; installation of new cast-in-place reinforced concrete personnel access tunnel with integral crane rails and adjacent crane rail footings; reconstruction of drainage, electrical, and mechanical utilities; site grading and paving.

Division 02 -	Existing Conditions, Subsurface Investigation.
Division 31 -	Earthwork, Site Clearing, Grading, Excavation and Fill, Subgrade Preparation, Excavation, Shoring, Tunneling and Mining, Tunnel Excavation.
Division 35 -	Waterway and Marine Construction, Common Work Results for Waterway and Marine Construction, Waterway and Marine Construction and Equipment, Marine Construction and Equipment, Dam Construction and Equipment.
Division 41 -	Material Processing and Handling Equipment, Cranes and Hoists, Cranes.