Status of Phase 1 Construction
August 20, 2014
Three significant tasks of Phase 1 work need to be completed before Phase 2 contractor will be able to divert the river through the Phase 1 work
- Demolition and repair of concrete surfaces in the water passage area through the three spillway openings
- Completion of the rock anchor block at the base of the concrete structure, pressure grouting of the dolomite bedrock under the concrete structure and the placement of approximately 20 rock anchors up to 40 feet into the bedrock
- Installation of the Phase 2 new flood gate guide channels and forming and placing the two new concrete piers
Overview of Phase 1 Concrete Demolition Work as of August 20, 2014
Bottom – New Concrete Rock Anchor Block with yellow drill rig on far end
Middle – Three spillway openings with old concrete piers removed and demolition of weak concrete in progress
Top – Work on removal of south end of concrete beam by saw cutting
1. Concrete Demolition
Concrete is mostly very strong with some areas of deterioration as can be seen in the pictures below. This is difficult work as most of it is done by hand in a limited work space.
Rock Anchor Block area being made ready to install dowels into existing structure and then form and pour anchor block. Three anchor blocks left to construct
Dowel pull test to 60,000 pounds. Each dowel is epoxy grouted into drilled holes and must be able to handle a 60,000 pound pull test
Drilling into bedrock on completed anchor block
Bedrock Grouting operation. Grout mixer at top. Grout lines across to base of anchor block work area
Pat Colgan
August 21, 2014