certification of permanent prestressed ground anchors ... · certification of permanent prestressed...
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Certification of Permanent Prestressed Ground Anchors & Reinforced Fill
Products
Terence C.F. ChanChief Geotechnical Engineer/Geotechnical Projects
GEO, CEDD
Environment, Transport and Works Bureau Technical Circular No. 16/2004“The Use of Permanent Prestressed Ground Anchors in Government Projects”
Anchor Certification System
•ensures consistent and satisfactorystandards in the provision of groundanchors• saves time for designers andcontractors by eliminating repetitivechecking of the design of componentsand assembly details
Environment, Transport & Works Bureau Technical Circular No. 24/2003“Permanent Reinforced Fill Structures and Slopes”
Certification of Products
• Only apply to polymeric reinforcingproducts (tensile strength & stress-strain characteristics are temperatureand/or time dependent)
• Ensure safe design tensile strength• Ensure adequate quality assurance• Elimination of repetitive checking
Polymeric Reinforcement
Ribbed polyolefincasing
Polyester orpolyaramid bands
Woven or knitted polyestergrid or grid formed by welding/knitting individual strips/bars
Drawn polymer sheet containing holes
Strips/bars
Assessment
• Durability• Creep and stress rupture• Construction damage• Fill-to-reinforcement interaction
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