Cofra B.V. products

Since the development of the synthetic prefabricated vertical drain (PVD) also known as wick drain in the late 1970ties, Cofra is worldwide one of the leading contractors. Cofra has installation rigs available for each soil type, varying from very soft soils to very stiff intermediate layers. Installing worldwide, we encounter depths of 3 to over 60 meter! Our heavy installation sets are the strongest in the world and able to penetrate 25 to 30MPa sands. For working offshore, we have the necessary experience and equipment. Our installation rigs are designed for containerized transport and thus easy to ship to any project location in the world.

Since the development of the synthetic prefabricated vertical drain (PVD) in the late 1970ties, Cofra is worldwide one of the leading contractors in this segment. Cofra has installation rigs available for each soil type, varying from very soft soils to very stiff intermediate layers that can be deployed on pontoons. Our installation rigs are designed for containerized transport and thus easy to ship to any project location in the world. Being part of maritime service provider Boskalis gives us a unique access to resources and floating equipment to help execute your project

Cofra has a long track record in the field of vacuum consolidation. We have multiple vacuum consolidation systems within our range of techniques, amongst which Beaudrain, BeauDrain-S and the traditional vacuum consolidation method using a synthetic liner. All concepts, except for the BeauDrain system which uses an in-house developed special plough, are installed by using our own PVD rigs. Every system has its own solution to overcome loss of vacuum in sand layers. Ask us about the possibilities.

Cutoff walls are used for both environmental and civil projects. Cofra has many years experience in the manufacture and installation of Geolock cutoff wall. With Geolock, Cofra has realised projects in Europe, North America and Asia. Geolock is used for the isolation of existing waste disposal sites and the waterproofing of dikes, dams and motorways in cuttings. Geolock has an infinite number of applications and is competitive with traditional materials. Wherever a horizontal underground flow of groundwater, contaminated or otherwise, has to be blocked, Geolock offers the optimal watertight cutoff wall solution.

The Cofra Roller Compaction (CRC) method, also referred to as High Energy Impact Compaction (HEIC), is a technique that densifies loose granular materials up to a depth of 2 to 3 meters below the surface by pulling a non-circular roller over the surface of an area.

Cofra Dynamic Compaction (CDC) method, also referred to as Rapid impact compaction (RIC),  is a technique that densifies loose granular materials up to a depth of 7 to 9 meters below the surface by repeatedly dropping an hydraulically accelerated weight from a height of 1.2 to 1.5m onto a foot which remains in contact with the soil. This provides a highly save and sound operational process when compared to Dynamic Compaction. We have hammer available ranging in drop weights from 9 ton up to 16 ton. 

Cofra has started with the application of Geotextile Encased Columns when former Mobius sections, in the past the market leader in the installation of GEC, were acquired by our parent company Boskalis. Due to our strong relationship with Huesker Cofra has become one of their preferred installers to install the GEC columns on every location in the world.

Stone columns are widely used as ground improvement method for unsuitable soils to improve its bearing capacity and limit settlements. Cofra has the capability to install stone columns using special rigs attached to our standard base units. Ask us for the possibilities in applying stone columns for your project.

Cofra was one of the pioneers in the field of piled embankments and has installed piled embankment for over 15 years. For the cases where our consolidation or other element solutions may not provide the desired results in term of embankment construction or residual settlement Cofra has developed the AuGeo piled embankment system to deliver settlement-free road construction platforms in a very short period of time. Due to the installation method of the AuGeo pile using a static downward force, without vibrations, it is guaranteed that each pile has a predetermined load-bearing capacity. This also means that local variations in the soils can be accommodated for. Contact our specialists for more information.

Cofra is an highly experienced installer of PE geomembranes with more than 25 years of experience. We are one of the largest installers in the Netherlands on waste disposal sites and in the civil application of KIWA-certified 2.0 mm HDPE geomembranes. With help of our network, in-house expertise and engineering department we can provide you with assistance in the design of the capping structure, get you in contact with industry experts and quality assurance agencies or brainstorm with you about out of the box ideas. Please get in contact if you would like to know more about what we can do for you.