- Client: Canton of Valais
- Construction management/contact person: PL, Daniel Zerna / OBL, Daniel Fryand / öBL, Egon Studer
- Site manager: Jasin Ajeti
- Foreman: Alain Ritz
- Construction period:March 2023 – July 2023
- Construction costs: 870,000
Technical data:
- 700m³ excavated material
- 3,000m³ embankment fill, installation of fill material
- 1,500 m³ L+V suitable material for embankment fill
- 270 m³ gravel sand UG 0/45 for infiltration basins
- 420 m³ gravel sand UG 0/45 <5% fines
- 480 m³ sand for infiltration basins
- 120 m³ reinforced concrete
- 12,000 kg reinforcement
- 1,100 m² paving (6+4cm)
Project description:
The project involves the construction of the SABA GERA near Raron railway station, along the covered Raron cutting. An excavation pit enclosure was required for the construction of the settling basin. The concrete structure was built in two stages: the first stage involved the actual basin, and the second stage involved the inlet section and distributor after the first stage had been filled in. The infiltration basin, whose bottom has a permeability of 1.2 l/sm2, consists of three types of material:
- 65 cm of backfill material consisting of upper Rhone gravel and sand 65 cm
- 40 cm unbound mixture 0/45, natural material, no recycled material
- 60 cm sand 0/2
Planting facilitates water infiltration. The inlet to the settling basin has been equipped with a slide valve and a bypass. A second bypass at the end of the settling basin completes the equipment.
Requirements:
- Short construction time
- Groundwater
- Work along SBB and high-voltage power lines
Special features:
- An RC gravel mixture B 0/45 <5% fine content was used for the foundation layer of the turning area. Remaining fill material from the client's warehouse.
