Delhi Dam Construction Progress Report #7
August 29, 2014
General Project Information and Schedule
Phase 1 was awarded to Lunda Construction Company in April 2014. An important goal of Phase 1 work is to complete enough refurbishing work on the existing concrete structure to allow river water flow to be diverted from the current river bed through the concrete structure. At the Trustees meeting, approval for going out for bids for Phase 2 work was made. Evaluation of overall project schedule is now complete enough to proceed to bidding. Our plan now is to award the Phase 2 work in October 2014.
Project completion date is dependent on many factors such as the river flow being average, minimal adverse weather events in the next 9 months, selecting a quality contractor for Phase 2 and finally, that the river flow at the time needed to refill the lake is sufficiently greater than the minimum flow that we must pass. Further, consideration must be given to all lake bed issues needed prior to refilling and the startup procedures for the new flood gates as they will be fully loaded for the first time only after the lake is initially filled. For all these reasons, it is not possible to give a firm date for project completion as much as we would like to other than to say third quarter 2015.
River flows continue to be below normal summer flows creating ideal construction conditions during the last two months.
Specific Progress by Lunda on Phase 1 work through August 27, 2014 includes:
Saw cutting on upstream piers removal is now complete. Demolition of weathered concrete is nearly complete.
Anchor Blocks for Rock Bolts. Proparation of area where concrete anchor blocks will be placed. Worker is testing steel dowel rods drilled into base of existing concrete structure. Each dowel (over 100 dowels when done) must withstand 60,000 pounds of pull strength. A few dowels are tested and then the remainder are installled.
After dowels are installed, area to receive anchor block concrete is filled with steel rebar prior to pouring concrete
Finally, forms are placed and the concrete is poured (as of August 29, 2014). This completes anchor blocks.
Work Progress through August 29, 2014
Review of work progress:
- Lunda has completed epoxying and tying 90% of Rock Anchor Block rebar at the Powerhouse section of dam.
- North and south Pier Noses have been completely removed.
- Concrete removal is continuing at the Stop Log and Flood Gate area for new Gate Guides and Sill Plates.
- More Concrete condition Survey left to be completed on the Wing Walls, Powerhouse and Tail Race wall below and to the north.
- Rock Anchor Foundation Grouting has started with holes # 1 & 3 grouted to refusal and holes #5, 8 and 9 drilled.
Project Schedules and Priorities:
Lunda’s priorities are as follows:
- Finish demo & rehab on spillway walls.
- Continue dewatering.
- Rock Anchor Foundation Grouting and Anchor installation.
- Begin forming and placing rebar at new Pier Noses.
Next Dam Construction Report – September 30, 2014
Pat Colgan