Extraction, processing and recycling of gravel, sand and aggregates for construction, infrastructure and industry in the Lake Constance region.
Kieswerk Hardt GmbH & Co. KG
Stockach (Kieswerkstraße 10)New on Amplifa
Raw material supplier in the Lake Constance region
Kieswerk Hardt GmbH & Co. KG, headquartered in Stockach in the Lake Constance region, has been active as a regional raw material supplier since 1971. The company mines natural moraine gravel (Alpine moraine) in dry excavation above the groundwater level and processes the raw materials exclusively mechanically on its own premises: by washing, crushing with special crushers and screening with vibrating screens. The product range comprises washed and unwashed grain sizes, chippings, crushed sand, gravel-sand, play sand in accordance with DIN 18034 as well as RC grain mixtures from the company's own construction rubble processing plant. In addition to raw material extraction, the company accepts uncontaminated excavated soil for renaturation and recultivation and, via its sister company Betonwerk Stockach-Hardt GmbH & Co. KG, delivers concrete to the districts of Sigmaringen, Konstanz, Ravensburg, Lindau and the Bodenseekreis. Customers include the building and civil engineering trades, the concrete and precast industry, landscaping and gardening as well as high-tech industry and glass manufacturing, for whom quartz sand from regional deposits is available.
- Site
- Stockach
- Processes
- Gravel extraction (dry excavation above the groundwater level), Washing (gravel washing), Screening (separation into grain sizes with vibrating screens), Crushing/breaking (special crushers into chippings and crushed sand), Recycling / processing of mineral construction waste (construction rubble processing plant), Excavated soil acceptance and reuse (renaturation/recultivation), Quality control in the in-house laboratory, Renaturation and recultivation of extraction areas
- Materials
- Washed sand, Kabelsand, Rusel, Fine gravel, Gravel, Washed gravel-sand, Washed play sand (DIN 18034), Masonry sand
- Certificates
- Aggregates for concrete (DIN EN 12620), Aggregates for asphalt and surface treatments (DIN EN 13043 + TL, Aggregates for mortar (DIN EN 13139), Play sand in accordance with DIN 18034, DIN EN 12620 (aggregates for concrete), DIN EN 13139 (aggregates for mortar), DIN EN 13043 + TL Gestein-StB (asphalt), DIN EN 13285 + TL SoB-StB (unbound mixtures), TL Pflaster-StB, DIN 18034 (play sand)
- Founded
- 1971
- Employees
- over 20 (together
- Industries
- Construction industry / Building and civil engineering, Road and path construction, Landscaping and gardening, Concrete and construction material precast industry, Playground and sports ground construction, Glass manufacturing / High-tech industry
- 01
Dry excavation of gravel and sand above the groundwater level
- 02
Intermediate storage in reserve piles
- 03
Transport via conveyor belts
- 04
Washing and crushing with special crushers
- 05
Screening into grain sizes with vibrating screens
- 06
Storage in piles and silos
- 07
In-house quality control
- 08
Logistics and dispatch
- 09
Recycling of mineral construction waste
- 10
Renaturation and recultivation of the extraction areas
Product range and processing methods
Natural moraine gravel (Alpine moraine)
Regional raw material deposit as the basis of the entire range of aggregates.
Washed sand
Fine washed aggregate type a for concrete and further construction material applications.
Kabelsand
Washed fine aggregate of the grain group 0/4.
Rusel, fine gravel, gravel
Coarse washed aggregates in the grain sizes 2/8 to 16/32.
Washed gravel-sand
Grain mixture 0/16 and 0/32 for earthworks and civil engineering.
Masonry sand
Unwashed fine aggregate 0/6.
Mineral moraine FSS/KTS
Unwashed grain mixture up to grain size 0/45 for earthworks.
Crushed sand and premium chippings
Washed crushed grains from special crushers, grain sizes 1/3 to 16/22.
RC grain mixture FSS/STS 0/45
Recycled grain mixture from the construction rubble processing plant for backfilling and compaction.
Play sand in accordance with DIN 18034
Washed play sand for playground and sports ground construction.
BSG bedding/joints
Bedding and joint material 0/5 to 0/11 in accordance with TL Pflaster-StB.
Site
Stockach
DEGravel extraction, processing, recycling, excavated soil acceptance, laboratory and administration
- Materials
- Gravel, sand, aggregates, RC material, topsoil
- Excavators
- Wheel loaders
- Conveyor belts
- Vibrating screens
- Special crushers
- Construction rubble processing plant
- In-house laboratory
- Scale
Products and aggregates
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Gravel extraction (dry excavation above the groundwater level)Guss | – | – | – | – | Gravel, Sand, natural moraine gravel (Alpine moraine) |
| Washing (gravel washing)Oberfläche | – | – | – | – | Gravel, Sand |
| Screening (separation into grain sizes with vibrating screens)Prüfung | – | – | – | – | Gravel, Sand, Aggregates |
| Crushing/breaking (special crushers into chippings and crushed sand)Umformung | – | – | – | – | Coarse gravel |
| Recycling / processing of mineral construction waste (construction rubble processing plant)Engineering | – | – | – | – | Demolition material, Mineral construction waste, RC grain mixture |
| Excavated soil acceptance and reuse (renaturation/recultivation)Engineering | – | – | – | – | Soil excavation, Humus/topsoil, Clay, Topsoil, Earth, Sand, Gravel |
| Quality control in the in-house laboratoryPrüfung | – | – | – | – | Aggregates |
| Renaturation and recultivation of extraction areasEngineering | – | – | – | – | Uncontaminated soil material |
| Delivery of concrete (via sister company Betonwerk Stockach-Hardt)Guss | – | – | – | – | Concrete |
| Transport and logistics of mineral raw materialsMontage | – | – | – | – | Gravel, Sand, Aggregates |
8 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Excavator | – | – | – | – | Stockach |
| Wheel loader | – | – | – | – | Stockach |
| Conveyor belts | – | – | – | – | Stockach |
| Vibrating screens | – | – | – | – | Stockach |
| Special crushers | – | – | – | – | Stockach |
| Construction rubble processing plant | – | – | – | – | Stockach |
| In-house laboratory (quality control) | – | – | – | – | Stockach |
| Scale | – | – | – | – | Stockach |
Additional services
Reference customers
Quality and certification
An in-house laboratory monitors the quality of the mineral raw materials in accordance with statutory requirements and standards; certified external institutes are called in if required. The aggregates are subject to external and voluntary quality monitoring by BÜV-Zert Ba-Wü e. V. and BPG Baustoffprüfgesellschaft mbH, testing institute Konstanz.
| Evidence | Stockach |
|---|---|
| DIN EN 12620 (aggregates for concrete) | |
| DIN EN 13139 (aggregates for mortar) | |
| DIN EN 13043 + TL Gestein-StB (asphalt) | |
| DIN EN 13285 + TL SoB-StB (unbound mixtures) | |
| TL Pflaster-StB | |
| DIN 18034 (play sand) |
History
- 1971
Start of the first gravel extraction work in the Hardt area near Stockach and in Orsingen-Nenzingen.