Anchor-Jet
Confronted with the limitations of traditional anchorage methods, Forasol undertook the development of a new technique, aimed at precision and a performance giving clearly superior results. A further objective was to industrialize the application, thus enabling not only increased productivity but also absolutely consistent anchorage quality, even under the most difficult conditions.
Anchor-Jet is the result of 8 years of continual improvements. The technique has been successfully tried and tested on several particularly demanding major construction sites.
An easier and faster technique which delivers better controlled ,more effective results, we invite you to browse the following details which better explain the advantages the use of this procedure can deliver to your foundation construction.
Traditional methods require a number of successive steps for drilling, inserting the tendon and injecting the sealing cement (which takes several days!). The Anchor-Jet technique enables all these operations to be carried out in a single step, taking barely an hour, thus eliminating the waiting time between each injection: the results are less idle time, greater productivity and generally faster completion times.
The Anchor-Jet technique enables very accurate determination of operating parameters. The sealing bulb is produced to the engineers’ criteria, accurately respecting the specified dimensions. Calculation of the anchorage force beforehand represents a significant step forward compared to traditional methods, where results, being dependent upon the operator’s judgement as work progresses, are highly unpredictable.
Thanks to the Anchor-Jet operating system, considerably less added water is necessary during drilling. The risk of land subsistence is thus reduced, thereby preventing possible damage to adjacent structures.
With Anchor-Jet, the performance of very high load-bearing tendons is guaranteed even in poor quality soil. This is a result of the anchorages being realized in a perfectly controlled manner, rigorously respecting the pre-defined characteristics for each type of soil. Compared to traditional devices, Anchor-Jet tendons offer approximately 50% greater anchorage strength. It is thus possible to reduce the number of anchorage points for any given job.
Speed of execution, control over quality, predictability and consistency of results: all these parameters have a decisive influence on the cost of the anchorage work. They are the key benefits of the Anchor-Jet technique, and your guarantee of achieving superior performance, including from an economic point of view.
-click here to see Forasol's Anchor-Jet Movie,
6.58 minutes.
- Traditional Method: Several drilling and injection
steps, at least 6 to 10 days’ waiting time before tensioning
- Anchor-Jet Method: One single drillng and injection
step, only 5 days waiting time before tensioning.
1) Submerged Highway Approach to Tunnel, Collombey, Switzerland, 1999-2000
Canton of Valais, Department of Transport, Equipment and the Environment, Highways and Waterways Service
Subcontracting
for:
Billieux SA, Martigny Switzerland, and Evêquoz SA, Conthey Switzerland
Work:
Laying of 470 anchorages of 900kN
Free tendon length 8m to 9 m, sealing length 6m
Soil:
Fine, silty sand, below the groundwater level
Rate:
8 to 10 units per day, i.e. 160m per day
2) New COOP Supermarket Building in Grenchen, Switzerland, 2000
COOP Bern - Biel/Bienne
Marazzi Generalunternehmung AG, Muri b. Bern
Laying of 350 anchorages of 850kN
Free tendon length 7m to 10m, sealing length 7m
Fine silty sand, gravel, below the groundwater level
8 to 9 units per day, i.e. 150m per day
3) New COOP Shopping Center in Vevey, Switzerland 2002-2003
COOP AG (2nd Largest Supermarket chain in Switzerland)
HRS Hauser Rutishauser Suter SA, Crissier Switzerland
Jet Grouting of 580 H-beam reinforced columns, 1’000mm to depth of 20m Jet Panel grouting of 2’100 m2
Laying of 250 anchorages of 600kN
Silty sands, below groundwater level
6 to 8 units per day, i.e. 150m per day