Bill Murray, 1101 Market Street, Chattanooga, TN 37402

Z -- POST TENSIONING SOL 1E-186526 DUE 092396 POC Contracting Officer, Bill Murray, 423/751-2346 Tennessee Valley Authority (TVA) will issue a Blanket Purchase Order (BPO) for post tensioning to be performed at several TVA dams. The BPO will be for a period of 5 years. The following is a description of the work to be performed atthe Chickamauga Lock. (Other work will be similar): Post tensioning of Chickamauga Auxiliary Lock, river wall chamber blocks number 38, 39, 40, 45, and 46, upper guard wall block number 36, lower gate block number 47 and lower approach wall block number 48 is required due to serious cracking and the high longitudinal stresses caused by concrete growth/Alkali Aggregate Reaction (AAR). Subsequesntly, movement of the blocks has been recorded. Post tensioning of blocks 36, 38, 39, 40, 45, 46 and 48 will effectively tie the blockstogether and restrict movement. These blocks will also bracket blocks 37 and 47which are the upper and lower river wall gate blocks. This bracketing of the gateblocks will add addidtional stability to these blocks. Allowances are made in theloading of the tendons to accommodate for future concrete growth. The post tensioning system that will be placed in these blocks will consist of 52 strands,seven wire, grade 270 K tendons. The loading will be from 10% to 44% (300 kips to 1340 kips) of the ultimate strength of the tendon. These tendons are to be anchored 40 and 50 ft. below the rock/concrete interface. The tendons will be between 138 and 155 ft in length. Approximately 73 tendons are proposed to be installed in these eight blocks. TVA will mail Request for Proposals (RFP)on 8/23/96. To request a copy of the RFP send fax to 423-751-8462, attention: BillMurray. (0219)

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