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Olt Valley, km 239+500 - 246+500

Slope Stability - Olt Valley, km 239+500 - 246+500 2015

A combination of two protection systems: active TECCO® SYSTEM³ is installed under the GBE-1000A rockfall barrier line providing passive protection

Slope Stability - Olt Valley, km 239+500 - 246+500 2015

Superficial cleaning of the slope and drilling points stake-out

Slope Stability - Olt Valley, km 239+500 - 246+500 2015

Drilling points stake-out in progress - visible national road DN7

Slope Stability - Olt Valley, km 239+500 - 246+500 2015

Nails drilling directly through the high tensile mesh TECCO® 65/3

Slope Stability - Olt Valley, km 239+500 - 246+500 2015

TECCO® SYSTEM³ installation - the high tensile mesh perfectly follows the slope morphology

Slope Stability - Olt Valley, km 239+500 - 246+500 2015

Final positioning of the TECCO® SYSTEM³ splike plates type P33/40 and pre-tensioning of the mesh

Slope Stability - Olt Valley, km 239+500 - 246+500 2015

Slope fully secured with TECCO® SYSTEM³

Slope Stability - Olt Valley, km 239+500 - 246+500 2015

Another view of the fully stabilized slope

Slope Stability - Olt Valley, km 239+500 - 246+500 2015

TECCO® SYSTEM³ almost invisible after installation - its open structure allows perfect drainage

 

Year of installation

2015

Initial situation

National road no. 7 (DN7) is one of the most important routes through the Carpathian Mountains, with heavy traffic. The Olt River runs parallel to the DN7 with high mountains, directly next to the road. In winter and spring rockfalls occur regularly. Also with unstable slopes, torrents and avalanches the risk of accidents was high. 

This project was originally developed with five concrete canopies for rockfall protection. Due to costs and other restrictions, a modern solution using high tensile steel wire was chosen. After further investigation, 23 dangerous areas were found and had to be protected using two types of protection systems: active and passive.

Geology

Along the whole section, mica and para gneiss appear in outcrops belonging to the series of the tail (the upper Proterozoic ante) and the local packet sandstone, covered at the top by diluvium deposit (dust, sand and gravel powder blocks).


Slopes (for the most part covered with forest) show inclinations of up to 60 - 80° and are strongly tectonized (kneading such, micro cracks) and continuous processes of disintegration. The angle of the rock packages varies between 30 - 55° (lower to higher sandstone and mica).

Description

4200 m² of TECCO® System and 560 m² of SPIDER® System were installed together with nailing as an active protection measure on the following sectors:

1. km 240+421 - 240+441

TECCO® G65/3

  • stabilized area: 260 m²
  • slope height: 15 m
  • nail pattern: 2.20 x 2.20 m
  • nail type: GEWI 28
  • nail length: 3 m

2. km 240+441 - 240+467

SPIDER® S3-130

  • stabilized area: 540 m²
  • slope height: 18 m
  • nail distance: 2.50 m
  • nail type: GEWI 32
  • nail length: 3 m

3. km 240+510 - 240+555

TECCO® G65/3

  • stabilized area: 585 m²
  • slope height: 13 m
  • nail pattern: 2.50 x 2.50 m
  • nail type: GEWI 32
  • nail length: 3 m

4. km 242+457 - 240+610

TECCO® G65/3

  • stabilized area: 1377 m²
  • slope height: 10 m
  • nail pattern: 2.10 x 2.10 m
  • nail type: GEWI 32
  • nail length: 3 m

5. km 242+859 - 242+940

TECCO® G65/3

  • stabilized area: 640 m²
  • slope height: 13 m
  • nail pattern: 2.20 x 2.20 m
  • nail type: GEWI 32
  • nail length: 3 m

6. km 243+099 - 243+179

TECCO® G65/3

  • stabilized area: 1260 m²
  • slope height: 14 m
  • nail pattern: 2.20 x 2.20 m
  • nail type: GEWI 32
  • nail length: 3 m

See also the other projects of Olt Valley.

Customer

Compania Naţională de Administrare a Infrastructurii Rutiere (C.N.A.I.R.) – Directia Regionala de Drumuri si Poduri Craiova (D.R.D.P.)

Contractor

S.C. VECTRA SERVICE S.R.L.

Protected object

Road

Corrosion protection

GEOBRUGG SUPERCOATING

Engineering

S.C. IRIMAT Cons S.R.L. - Bucharest

Other participating companies

Sächsische Bau GmbH Dresden Germany, Sibiu Branch

Other installed applications

Rockfall Protection, Debris Flow & Shallow Landslide Protection

Your local contact

Roger Moor
   

Roger Moor

Country Manager Ost- und Zentralschweiz, Liechtenstein

Natural Hazards
Hydraulic Engineering
Mining / Tunnels
Geobrugg AG,Aachstrasse 11,8590 Romanshorn / Switzerland Country Manager Ost- und Zentralschweiz, Liechtenstein

E-Mail

René Müller
   

René Müller

Country Manager Kantone AG BE BL BS FR GE JU NE SO VD VS

Natural Hazards
Hydraulic Engineering
Mining / Tunnels
Geobrugg AG,Industriestrasse 21,5200 Brugg / Switzerland Country Manager Kantone AG BE BL BS FR GE JU NE SO VD VS

E-Mail

Alexander Bittendorfer
   

Alexander Bittendorfer

Project Manager Inspection Services

Natural Hazards
Geobrugg AG,Aachstrasse 11,8590 Romanshorn / Switzerland Project Manager Inspection Services

E-Mail

Isacco Toffoletto
   

Isacco Toffoletto

Ticino Country Manager

Natural Hazards
Hydraulic Engineering
Mining / Tunnels
Geobrugg AG Ticino,Stabile Cometal, via Pizzante 7,6595 Riazzino / Switzerland Ticino Country Manager

E-Mail