(DMI patent no. 10 2008 005 452)

 

Subsidence often takes place due to ground extraction when producing
boreholes for sleeve pipe injections, especially in the vicinity of groundwater
and underneath buildings. DMI has developed a unique boring system for
this eventuality with which it is possible to drill in the sleeve pipes directly
without protective casing. Around five to six work steps are normal for drilling
procedures in accordance with the current state of the art. The DMI system
requires just two work steps and it can be deployed in small spaces. The
engineering office CDM Consulting Berlin evaluated the drilling procedure
and injection on the basis of a test boring operation and compiled a positive
report on it.

 

Informational diagram below:

The current state of the art for pipe shields does not professionally allow for
one-off or repeated grouting via the driven-in valves. The valves fall out
during drilling in or do not close properly.

 

DMI has found a unique solution for this and further developed the patented
DMI steel sleeve pipe for pipe shields that allow for repeated grouting.

• Drilling in (drawing in) the pipes with drilling jumbo by excavation personnel
• No ramps for anchor drill necessary
• Repeated grouting possible
• Post-grouting possible for sealing purposes, even after excavation
• ø 76.1 / 88.9 / 101.6 / 114