Geotechnical Production Techniques
Inhaltesverzeichnis
We master virtually all geotechnical bore-, flush- and grout techniques that are common in the ground-engineering industry. We summarise of them as follows (more detailed descriptions are available on request):
Drilling Technique
Rotary (percussive) flush drilling
The rotary (percussive) flush drilling technique presents a traditional boring method that we still employ successfully on many occasions. This technique is especially suitable in sands and soft clays.
Reference project of rotary percussive flush drilling:
BV: Biosphärium ElbSchloss Bleckede, Umbau der Remise
Double head drilling (overburden drilling)
Overburden drilling typically becomes our method of choice when the risk of soil settlements needs to be minimised. Two centric rotary bore casings perforate the soil simultaneously, whereas the flush medium runs back up in between the inner and the outer casing in a controlled fashion. This drilling technique can be combined in various ways to fit specific geological conditions.
Reference project of overburden drilling:
BV: Dortmund-Ems-Kanal, km 54,357-55,801, Los 8 / Münster-Amelsbüren
Self-bore piling
Self-bore piling is a means of drilling the load bearing steel element directly into the building ground. A common application is the TITAN-micropile, a pipe piling system, which is grouted and left in-situ after boring it into the desired depth. In many situations, this technique provides a cost-effective alternative to conventional deep foundation methods.
Reference project of self-bore piling:
BV: HWS Tor Kornhausbrücke Hamburg
Auger drilling
Rotary augers are used to transport the soil on the flights to the surface. This method is often employed in combination with an overburden drilling technique to produce grout piles with diameters > 300 mm.
Down-the-hole-hammer drilling
Like auger drilling, down-the-hole-hammer drilling can be combined with other drilling techniques. It is most applicable in rock or limestone and is supported by air compression.
Reference project of down-the-hole-hammer drilling:
BV: Tivoli Himmelskibet
Injection and Grouting Technique
We master the follwong injection and grouting techniques:
- Primary injections
- Secondary injections
- Tubes-á-Manchette-injections
Secondary injections are primarily conducted in clays in order to increase the load bearing capacity of micropiles and ground anchors. Grout material is pumped under pressure through injection tubes busting open the previously produced grout body and thereby pressing it against the surrounding building ground to increase skin friction. Under special circumstances, injections via tubes-á-manchettes are carried out in order to improve the building ground or seal seams in between building structures.
tubes-á-manchette injections for ground stabilisation:
BV: Ausbau BAB A1 auf 6 Fahrstreifen, Gradientabsenkung am Bereich der DB-Überführung
Flushing Technique
Our flushing techniques, which serve the purpose of transporting soils to the surface, can effectively master almost any geological conditions. Depending on the project, we employ the following flushing media
- water
- compressed air
- water-cement-mixture
Reference project of compressed air flushing:
BV: Gründung Mast 3 und Mast 4
NEW – Warfare Agent Detection
Our most recent achievement has been the development of a safe method to detect warfare agents in the course of the anchor production. Our method allows us to use existing sounding techniques to explore the bore axis of possible warfare agents while drilling inclined anchors. Our method is especially applicable in cases where vertical sounding techniques are not possible due to building structures lying above. The technique ensures that any possible warfare agents are detected before our drilling tools can make contact with them. More details area available on request.
