|Whittaker Construction is preparing the interior of the LArTF building cylinder for the construction of the two enclosed access stairways. They have also installed a temporary access stair. Photo: Cindy Arnold|
Whittaker Construction Company, contracted to construct the Liquid-Argon Test Facility, has completed the removal of all the temporary work platforms inside the LArTF cylinder. They have poured concrete bases for the two enclosed stairways 40 feet below ground level and have constructed a temporary access stairway. Masons will now build the enclosed stairway structures. The loading dock area is visible at ground level on the other side of the cylinder.
Two large roof beams sit approximately 64 feet above the floor of the cylinder. The temporary stairway is seen at the right in the picture below. Contractors will build a removable roof in two sections to cover the rectangular opening. Precast concrete sections will cover the outer curved areas. The two roof beams are designed to support an additional 10 feet of shielding concrete that may be placed over the removable and arced roof sections to reduce cosmic-ray background in the MicroBooNE detector.