United States
United States

Kaikōura SH1 - SR8 and 9

Peketā, 7374, Kaikōura
2021
Customer
Contractor
Protected object
Road
Energy absorption capacity
N/A
System height
N/A
System length
110 m
Corrosion protection
GEOBRUGG ULTRACOATING
Initial situation

The Kaikōura M7.8 Earthquake caused widespread damage to the road and rail corridor 20 km North and South of the Kaikoura town ship. Over 40 major slips inundated the road and rail with over 750,000 m³ of material form source zones up to 500 m above sea level.  The highly fractured Grey Wacke meant frequent future rockfalls were expected. The rockfall frequency and wide run out area at SR8 and 9 created the requirement for a system that attenuated the rockfall energy to a manageable level, was quick to install and required minimal future maintenance. The Slope on average is approximately 50 degrees but in some parts is near vertical.

Description

A 110 m wide rockfall attanuator (ATT - 60) with a 35-40 m tail was specified due to its high puncturing resistant yet light weight high tensile (1770 MPa) TECCO 65/4 tail which enables the attenuated material to pass down through to the lower section for clearing if required. The 65 mm aperture is small enough that no secondary mesh is required and the Ultracoating ensures design life in the coastal environment. The attenuator system utilises a 3 m high hinged post with a 16 m spacing and a support rope separation half way.  A double top rope was installed for increased safety in design and Type III flex heads were installed to transfer the load to the Gewi 32 anchor bar. Overall the benefits of an attenuator creating a quick and cost effective solution.

Your local contact

Kevin H. Coyle
Kevin H. Coyle
Regional Manager Northeast
Natural Hazards
Geobrugg North America, LLC
3 Beaudet Terr
Columbia CT 06237 / United States
Saleh Feidi
Saleh Feidi
Regional Manager California
Natural Hazards
Geobrugg North America, LLC
8921 Emperor Ave.
San Gabriel, California 91775 / United States
John Kalejta
John Kalejta
Regional Manager Central US
Natural Hazards
Geobrugg North America, LLC
3215 67th Avenue Pl
Greeley CO 80634 / United States
Bob Lyne
Bob Lyne
Regional Manager Southeast
Natural Hazards
Geobrugg North America, LLC
8004 Windspray Drive
Summerfield NC 27358 / United States
Pierce Runnels, Civil Engineer
Pierce Runnels, Civil Engineer
General Manager Geobrugg North America
Natural Hazards
Geobrugg North America, LLC
22 Centro Algodones
Tim Shevlin
Tim Shevlin
Sales Director
Natural Hazards
Geobrugg North America, LLC
Salem OR 97302 / United States