Concrete plant, ready-mix concrete plant and gravel plant in the St. Gallen Rhine Valley with three locations
Sigmund Sieber AG
Diepoldsau · Widnau · OberrietNew on Amplifa
About Sigmund Sieber AG
Since 1934, Sigmund Sieber AG has produced and delivered concrete, mortar, gravel and sand in the St. Gallen Rhine Valley. What began as a manual gravel extraction operation on the Old Rhine has developed into a modern concrete plant with three locations in Diepoldsau, Widnau and Oberriet. The product range includes ready-mix concrete to SN EN 206, lightweight concrete (e.g. LC 16/18), recycled concrete RC-C in accordance with Merkblatt 2030, sand, gravel and in-house manufactured seepage slabs; all products are also available in recycled versions. All listed concrete grades are produced at the Oberriet and Widnau plants, while special requests such as coloured concrete are handled at the Diepoldsau ready-mix concrete plant. Delivery is carried out with truck mixers equipped with conveyor belts and concrete pumps to construction companies and private builders. Under the leadership of Hansjörg and Nadia Sieber (third generation), the focus lies on sustainability and quality, assured by an in-house laboratory manager.
- Site
- Diepoldsau
- Processes
- Concrete production (ready-mix concrete to SN EN 206), Mortar production/delivery to order, Gravel and sand production (gravel plant), Manufacture of seepage slabs (in-house production), Recycled versions of all products, Transport with truck mixer with conveyor belt, Concrete pumps (pumped concrete) incl. reach diagrams, In-house production control (WPK) certified by SÜGB
- Materials
- Concrete, Mortar, Gravel, Sand, Seepage slabs, Recycled concrete RC-C, Lightweight concrete, Ready-mix concrete to SN EN 206
- Certificates
- In-house production control (WPK) for standard concrete to SN EN 206, WPK for standard concrete (SÜGB), since 2006
- Founded
- 1934
- Industries
- Construction, Construction companies, Private builders
- 01
Gravel and sand extraction
- 02
Concrete and mortar production (SN EN 206)
- 03
Manufacture of seepage slabs
- 04
Transport with truck mixer/conveyor belt
- 05
Pumped concrete with concrete pumps
- 06
In-house production control (WPK)
Products and Formulations
Ready-mix concrete to SN EN 206
Standard concrete in all compressive strength and consistency classes, produced in Oberriet and Widnau.
Lightweight concrete
Concrete with a defined density class according to SN EN 206.
Recycled concrete RC-C
Recycled concrete in accordance with Merkblatt 2030 as a sustainable alternative.
Mortar
Delivered to order directly to the construction site in the morning, with mortar tub against deposit.
Gravel and sand
Own mineral aggregates from the gravel plant, also available in recycled versions.
Seepage slabs
In-house manufactured concrete products for drainage and infiltration.
Locations
Diepoldsau
CHMain plant with office and dispatch, ready-mix concrete plant, sand/gravel/special concrete
- Lot size
- Special concrete such as coloured concrete after consultation
- Materials
- Concrete, mortar, sand, gravel
- Ready-mix concrete plant
Oberriet
CHReady-mix concrete plant, concrete/sand/gravel
- Materials
- Concrete, sand, gravel
- Concrete plant
Widnau
CHTransshipment hub, concrete, directly on the A13 motorway
- Materials
- Concrete
- Concrete plant
Products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Concrete production (ready-mix concrete to SN EN 206)Casting | – | – | – | – | Concrete, Recycled concrete RC-C |
| Mortar production/delivery to orderCasting | – | – | – | – | Mortar |
| Gravel and sand production (gravel plant)Other | – | – | – | – | Gravel, Sand |
| Manufacture of seepage slabs (in-house production)Other | – | – | – | – | Concrete |
| Recycled versions of all productsOther | – | – | – | – | Recycled concrete, Recycled gravel |
| Transport with truck mixer with conveyor beltAssembly | – | – | – | – | – |
| Concrete pumps (pumped concrete) incl. reach diagramsAssembly | – | – | – | – | Concrete |
| In-house production control (WPK) certified by SÜGBTesting | – | – | – | – | Concrete |
4 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Concrete plant | – | 2 | – | – | Oberriet and Widnau |
| Ready-mix concrete plant | – | – | – | – | Diepoldsau |
| Truck mixer with conveyor belt | – | – | – | – | – |
| Concrete pump | – | – | – | – | – |
Additional services
Quality
All products follow quality standards assured by an in-house laboratory manager. In-house quality testing is carried out in accordance with SIA 262/1.
| Evidence | Diepoldsau | Oberriet | Widnau |
|---|---|---|---|
| WPK for standard concrete (SÜGB), since 2006 |
History
- 1934
Foundation; began as a manual gravel extraction operation on the Old Rhine
- 2006
In-house production control (WPK) for standard concrete certified by SÜGB