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Slope Stability - Schänis, State Road 17 2016

Installation using a mobile drill rig

Slope Stability - Schänis, State Road 17 2016

Installing a section towards south-east, before placing the spike plates

Slope Stability - Schänis, State Road 17 2016

Protected object: Quiet during the day, very congested during rush-hour

Slope Stability - Schänis, State Road 17 2016

Risk of toppling rocks is a thing of the past: SPIDER® ensures safe traffic (view of the north-eastern section)

Slope Stability - Schänis, State Road 17 2016

Location: Linth Plain, Switzerland Federal Office of Topography, Bern, Switzerland National Map 1:50'000

 

Year of installation

2016

Initial situation

The area was formed by glaciers. With climate change, the rock underneath, molasse conglomerate rock, has become more unstable. During the past few years sections of rock, some with volumes of around 1 m³, became dangerously loose and were in danger of eminent fall onto the road, the building below and the neighboring pastures.

The Swiss State Agency for Forest and Natural Hazards immediately alerted the regional road inspectorate and political community to the potential risk.

Geology

Instable blocks of molasse conglomerate.

Description

As a short term emergency measure Geobrugg worked with the regional road administration and a local contractor to stabilize the most critical rock sections with SPIDER® S3-130.

As a long-term solution that ensures safe driving conditions for daily commuting, an anchored system was installed. Along the deep chasms all along the molasse bar, three levels of anchors were drilled. The higher and lower levels were drilled to a length of 4 m while the anchors of the middle rows were drilled to a length of 7 m. These anchors were drilled to a grid that measures 2.15 m x 2.15 m.

The whole project from planning to final acceptance took only six weeks.

Country/Region

Switzerland

Customer

State Department for Underground Construction, Canton St.Gallen, Switzerland

Engineering

Geobrugg AG, Geohazard Solution

Contractor

Oberholzer Inc., Neuhaus, Switzerland

Protected object

Road, Building

Corrosion protection

GEOBRUGG SUPERCOATING

Your local contact

Kevin Coyle
 

Kevin Coyle

Regional Manager Northeast

Natural Hazards
Hydraulic Engineering
Geobrugg North America, LLC,3 Beaudet Terr,CT 06237 Columbia / United States Regional Manager Northeast

E-Mail

Saleh Feidi
 

Saleh Feidi

Natural Hazards
Hydraulic Engineering
Geobrugg North America, LLC,8921 Emperor Ave.,91775 San Gabriel, California / United States

E-Mail

John Kalejta
 

John Kalejta

Natural Hazards
Hydraulic Engineering
Geobrugg North America, LLC,KS 67226 Wichita / United States

E-Mail

Bob Lyne
 

Bob Lyne

Natural Hazards
Hydraulic Engineering
Geobrugg North America, LLC,8004 Windspray Drive,NC 27358 Summerfield / United States

E-Mail

Pierce Runnels, Civil Engineer
   

Pierce Runnels

General Manager Geobrugg North America

Natural Hazards
Geobrugg North America, LLC,22 Centro Algodones , Civil Engineer General Manager Geobrugg North America

E-Mail

Tim Shevlin
 

Tim Shevlin

Natural Hazards
Geobrugg North America, LLC,OR 97302 Salem / United States

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