Kerenzerberg, Highway A3, Glarus Nord

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Protezione da caduta massi - Kerenzerberg, Highway A3, Glarus Nord 2015

View of Highway A3 seen through the ROCCO^® ringnet

RXE-8000 with an an impressive height of 7.0 meters

RXE barrier protecting infrastructure

Traffic protected on road and railway

RXE type barriers and TECCO^® System: two systems supporting each other

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

Sistemi

RXE-500 RXE-1000 RXE-3000 RXE-8000

Lunghezza del sistema

14 m - 62 m

Anno di installazione

2015

Situazione iniziale

Highway A3 was opened in 1964 as a 2-lane road passing through the topographic bottleneck of the Walensee. The Walensee is one of the main thoroughfares between the Swiss plains and the mountainous regions and ski resorts. The roadway has always been exposed to rockfall and rockslides from the beginning. In 1986, due to increased traffic volume, one of the most frequented tunnels was expanded to four lanes. Naturally, geohazard protection measures were required to be installed along with the roadway expansion.

In 2012 it became apparent to the Swiss Federal Roads Office FEDRO that several hot spots for geohazards would require immediate maintenance to keep Highway A3 open. The identified hot spots include various tunnel entrances, steep slopes and sheer rock faces along the roadway. The project planning phase began in 2013, and by the end of 2015 the first protection systems of Geobrugg’s newest generation were installed.

Official project name at the FEDRO, Federal Office for Roads: Glarus Nord

Overall costs of the protection project (estimated in 2014): 11 Mio. Swiss Francs

Descrizione

This description only details the northwest oriented tunnel entrances of Ofenegg and Kerenzerberg.

The overall project included a portfolio of Geobrugg flexible barrier systems protection measures to contain rockfall events. The selection was based on extensive rockfall analysis, taking into account bouncing heights as well as energy impacts. System strength, height and line lengths were set to maximize safety and optimize cost-effectiveness.

Above the two tunnel entrances the following Geobrugg rockfall protection systems were installed in geographical order from southwest to northeast:

Barrier 1 : RXE-500, height 3 m, length 31 m
Barrier 2 : RXE-500, height 3 m, length 26 m
Barrier 3 : RXI-150, height 4 m, length 55 m
Barrier 4 : RXI-025, height 2.5 m, length 14 m
Barrier 5 : RXE-1000, height 4 m, length 25 m
Barrier 8b : RXI-150, height 4 m, length 17 m
Barrier 8c : RXE-1000, height 4 m, length 25 m
Barrier 9 : RXE-8000, height 7 m, length 62 m
Barrier 10 : RXE-3000, height 5 m, length 50 m

More information:
Movie of the 2015 RXE-8000 installation
Slope protection of this site "Muehlehorn"

Cliente

FEDRO Federal Roads Office, Switzerland

Contraente:

CRESTAGEO, Chur, Switzerland

Oggetto protetto

Strada, Ferrovia

Protezione dalla corrosione

Galvanized, GEOBRUGG SUPERCOATING

Progettazione:

Project Partners Ltd Consulting Engineers, Grancia-Lugano, Switzerland

Altre applicazioni installate

Consolidamento di versanti