5. 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
6. Major Operations
§ Demolition of anchor blockouts
§ Drilling for the anchors
§ Anchor Fabrication
§ Anchor Grouting
§ Anchor Stressing
9. 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
11. 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
20. 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
