Quentin L Seven Mile Dam Anchors Presentation

2004 ! PETER KIEWIT SONS CO ! 48th ANNUAL WESTERN CANADA DISTRICT MEETING

Seven Mile Dam Phase II Anchors

Quentin Luey

Presentation Outline §  The Estimate §  Scope of Work §  Major Operations §  Conclusions

The Estimate §  Kiewit - $12,944,950.00 §  Haywood Baker - $16,448,330.00 §  Walter - $18,264,720.00 §  Graham - $18,345,000.00

Estimator District QC

The Largest Anchors in the World

Scope: §  Fabrication / installation / post tensioning of 48 strand

anchors. §  Each anchor made of 92 strands with a GUTS of 5.4

million pounds §  During construction owner adds 6 more anchors

increasing contract value to $14,700,000

Major Operations §  Demolition of anchor blockouts §  Drilling for the anchors §  Anchor Fabrication §  Anchor Grouting §  Anchor Stressing

Demolition

Budget = $1040 / yd3

Actual = $985 / yd3

Drilling

Budget = $65 / ft

Actual = $58 / ft

M13 Autoshot Survey Tool §  Specifications called for a

1:300 alignment §  After 54 drill holes the average

accuracy achieved was 1:450 §  The best result achieved was

1:2200 §  Software included with the tool

produces a 3-D image of the actual travel of the drill hole

8� 410�

1:600

Corrosion Protection

The Anchor

Bond zone

Bare steel strand

No wax or sheathing

Holds anchor in the ground

Free stress length

Steel strand coated in wax and HDPE

Elongation occurs in this section

Anchor Fabrication Yard

Budget = $69 / strand Actual = $48 / strand

Anchor Fabrication

Right way

Wrong Way

Anchor Installation

Dinosaur

Budget = $1755 / install Actual = $1340 / install

Anchor Grouting §  Grout was mixture of Type 10

cement and water with a W / C ratio of 0.45

§  Absolutely no admixtures allowed

§  Anchor is grouted on the inside and outside of the sheathing simultaneously

Anchor Stressing Average Elongation = 24�

Conclusions §  Significance §  People Involved

Club Seven Mile