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Consolidated Prospectus 2016

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Mechanical soil improvement after ZTV

From time immemorial the ZTVE tr occupy a special position, because the underlying ATV DIN 18300 apply to almost all civil engineering areas. To this end, next to the road include earthworks for all buildings as well as for railway roadways, dams, levees, canals and pipelines.
In the preface to 2. Edition, version 1997 the ZTVE (Kirschbaum Verlag Bonn) by Professor Dr.-Ing. Rudolf Floss says among other things:
To use the state of the art with all available technical and economic means - the site-specific conditions, to take account of the functionally necessary collateral and the requirements of environmental protection.

An essential component of ZTVE is shown in the improvement of unsustainable soil. Thus, these shelves can be solidified or improved by various methods.
These include under the ZTVE 12.2 the Mechanical soil improvement.

Mechanical soil improvement can be applied in the underground, in the dam footprint and foundation to improve the mounting ability and compressibility of soil and to facilitate the feasibility of construction.
The following methods can be considered:
  • Improving soft ground by shaking in, hammering or mixing of suitable building materials. Suitable materials in this case are such. As sand, gravel, stones and industrial by-products in accordance with the relevant parts of the "leaflet on the use of industrial by-products in road construction".
  • Improving silty or clayey soils by mixing suitable soil, if necessary after previous loosening with suitable equipment.
  • Improving sand or gravel with enggestufter particle size distribution by mixing appropriate grits and where appropriate - as long as the final layer should be driven - by the addition of fine grain to 0,063 mm (clay mineral) in such small quantities that a binding effect on the surface, but no sludge formation enters.


In no paragraph is pointed out in the technical code that contained in the soil stones sieved (separated) should be to achieve a soil improvement or stabilization.


The company Stehr from the Upper Hessian Schwalmtal developed precisely for this prescribed procedure a machine that is ideally suited to use this environmentally protective and cost-effective construction methods.


The Stehr recycler as an attachment for hydraulic excavators


Excavated soil that has been exchanged so far is expensive, processed so that in most cases no or very little binder is added. Only by breaking with simultaneous mixing of the excavation contained mineral residues optimum particle composition and thus a high-quality compression enabled building materials is produced. All excavation, as RAP old subbases, stones, rubble, etc., is processed directly on the site, and supplied a cost-effective, environmentally-friendly recycling. Annoying dust developments which occur during spreading of binders are avoided, as other binder, such as lime and cement can be used.
Very good results are achieved by mixing in recycled materials or manufactured sand. Since this material hydraulically acting residues are still present here a long-term effect is even determine. These findings were observed by Erdbaulabors and soil experts.


Stehr Contact

Stehr Baumaschinen GmbH
Am Johannesgarten 5
36318 Schwalmtal Storndorf

Phone: +49 (0) 6630 / 91844-0
Fax: + +49 (0) 6630 / 91844-99
E-mail: info [@]