1.
PVD
Prefabricated Vertical Drain

2.
PVD takes the lead in soil consolidation
• Drain developed with more than 30 years of
experience in soil consolidation
• Approx. 300 mio linear metres of PVD
installed worldwide
• PVDwork backed-up by extensive
studies and testing by renowned institutes
(e.g. Delft Geotechnics, Geosytec)

3.
Functions
• Forms a path for excess pore-water created by
the overburden, water is drained off to the
surface resulting in a stale subgrade on which
construction can take place.
• Reduces consolidation time of soft soils
significantly, which result in substantial cost
savings

4.
PVD
• 10 cm wide with a solid polymer core covered on
both sides with a strong & permeable filter fabric
• Outer filter fabricate bonded to the core over its
entire surface to form a homogeneous
geocomposite product
• Unique patented hydraulically-designed core for
maximum water flow capacity

5.
PVD
Fully bonded composite:
Unique combination of patented, hydraulically
designed core structure bonded to nonwoven
filter layers over the entire surface

6.
• `
Reduction of Consolidation Time
Reduction of
consolidation time from
more than 15 years to
about 1 year

7.
PVD Benefits
High performance
Easy to handle
Durable

8.
High Performance
High performance
• Nonwoven layers deliver
– Optimal filtration
– Permeability
– Strength
• PVD tensile strength increased by 25%
• Suitable for use in all soil types

9.
Easy To Handle
• Roll length increase to 300 meters reduces
number of connections on site
• 30% Volume reduction resulting in less storage
spaced on site
• New pachaging allows faster unloading of
container

10.
Durable
• Thermal bonding of filter to the entire surface
of core structure ensures that the filter is kept
taut across the flow channels
• Filter cannot tear or become separated from
the core when passing over the pulleys at the
rig top or during soil consolidation

11.
INSTALLATION
• A purpose-built installation rig mounted on a
hydraulic excavator is usually used to install
PVD.
• The Height of rig is equal to the istallation
depth of PVD.

12.
PVD INSTALLATION
• PVD Install into the mandrel
• Mandrel section have oval shape

13.
INSTALLATION METHODS
• Water Jetting
• Ramming
• Hydraulic Pushing
• Hydraulic Pushing + vibration
• Hydraulic Pushing+ water jetting

14.
INSTALLATION

15.
CONSTRUCTED PROJECTS

16.
Japan

17.
Airport - Singapore
Changi
Depth: 50 m

18.
Sewage Refinery – Urmia Iran

19.
Seymare Dam - Lorestan Iran