spülen en_8170-0.pdf
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Jetting as installation aid for
vibrating, impact pile driving
and pressing
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JettingDescription
Soil types
Jetting is suitable as installation aid for noncohesive
soil (sand, sand-gravel mixture) with high and even very
high density but also for cohesive soil (silt, clay) with
stiff consistency.
Advantages
Replaces predrilling or soil exchanges
Cost-effective
Performance-increasing
Easy to handle
Protection of piles
Reduction of ground vibration
Jetting is used as installation aid for vibrating, impact
pile driving and pressing.
Depending on the soil conditions, it is possible to usewater, compressed air or a combination of both. These
media reduce surface friction and transport loosened
material. For bringing the medium to the lower end of
the piles, jetting pipes are mounted on the piles.
Normally the pipes are open on the lower end. They can
also be equipped with valves on the lower end, which
close after the end of the jetting process, so that no soil
can invade the pipe.
The jetting with water is executed in low pressure
method. For this method rotary pumps are used. They
produce a maximum working pressure of 25 bar at aflow of 5 l/sec per pump. For jetting with compressed
air a working pressure of max. 8 bar and an air volume
of up to 2 m/min are used. The installation aids reduce
driving periods, protect piles, prevent overloading of
the driving unit and reduce ground vibration. Observing
certain conditions for the method like adequate driving
units, number and size of the jetting pipes, medium flow
and medium pressure, the piles can be installed even in
very compact and changing soil conditions.
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JettingArrangement of jetting pipes
Jetting platform
Jet pipes
GroundwaterGroundwater
ClayClay
GravelGravel
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JettingInstallation process
Positioning sheet piles whilejetting.
Alignment and beginning ofpositioning.
Mounting of sheet piles.
1 2 3
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Closing of jetting pipes.Separation of jetting pipes andflush hoses.
Positioning to final depth.
4 5 6
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JettingEquipment technology
20-ft. container
Electrical switch cabinet
Receiver for radioremote control
Frequency converters
2 centrifugal pumps
Hose feedthrough
Water inflow with filter
Water storage container
Manhole
Compressed air reservoir
Piston compressor
4 connections for water flushing hoses
Connection for compressed air
Flow controls and gauges
Pressure gauge
Jetting container
Radio remote control
Water storage container, capacity 8 m with manhole. 2 centrifugal pumps, each with a pumping capacity of
20 m/h, and a maximum pumping pressure of 25 bar,
driven by 30 kW electric motors.
2 frequency converters to adjust the frequency of the
pumps.
Piston compressor, capacity max. 1319 l/min,
max. pressure 15 bar.
Compressed air reservoir capacity 250 l.
Electrical switch cabinet with connecting sockets. 4 connections for water flushing hoses with flow
controls and pressure gauges.
Connection for compressed air.
Radio remote control with control of all functions and
display.
The entire jetting unit is installed in a 20-ft. container.
Measurements: 6055 x 2438 x 2591 mm.
Weight: approx. 5100 kg.
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Notes
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BVV Spezialtiefbautechnik Vertriebs GmbH
Bleibtreustrasse 9, D-81479 Munich/Germany
Tel.: +49 89 665193-0
Fax: +49 89 6131 748
Liebherr-Werk Nenzing GmbH
P.O. Box 10, A-6710 Nenzing/Austria
Tel.: +43 50809 41-473
Fax: +43 50809 41-499
LWN1053706904/2010Subjecttochangewithoutnotice.