What We Do


Increased pressure on the hardwood industry, replacement costs and the issue of durability mean that alternative bank protection products are being used much more frequently than they were 10 years ago. One of these alternative products is a synthetic sheet pile. Due to its long life, the synthetic sheet pile is an excellent alternative to wood.

The Geoflex product

Geoflex was developed as a replacement for tropical hard wood in applications such as earth retaining constructions and bank protection. The aim was to produce an economically viable sheet pile with a long service life. An optimal weight/strength ratio was determined with the aid of computer models. This gave rise to two types of profile: the Geoflex 210 and the Geoflex 420.

Why Geoflex?

Vinyl is a material that has excellent resistance to weathering and possesses a long service life. Furthermore, it is unaffected by natural substances that occur in the soil, rodents and salt and fresh water. This makes it possible to develop bank protection and earth retaining constructions with a much enhanced service life.

Installation of Geoflex

A Geoflex profile weighs only 3.4 and 5.3kg/m and thus the 210G (corrugated sheet) weighs only 11 kg/m². It is therefore very easy to handle, even in longer lengths. Before installation, two sheets are assembled to form a 0.5m wide profile.

This provides the following benefits:
  • Low transportation cost
  • High production
  • Lightweight installation equipment
Geoflex can be installed by means of a “water jet system”, free fall hammer, pneumatic hammer or vibrator, or, if the ground permits, it can be inserted with an excavator. At greater depths or in the case of hard ground, a steel guiding sheet pile is used. Geoflex can easily be combined or connected with other construction materials. The sheets can be glued, welded, sawn or drilled. Wood, concrete, steel or plastic can be used as a cap and wale system. The application of waling with anchoring is also possible. Applications of Geoflex include:
  • Sheet pile
  • Retaining wall
  • Cutoff wall
  • Temporary earth retaining wall for cutoff trenches or water retaining wall for excavations

Advantages of Geoflex:
  • Long service life
  • Weather resistant
  • Resistant against rodents
  • Environmentally friendly
  • Simple to install
  • Corrosion resistant
  • Economical
Cofra B.V. is an innovative contractor specialising in ground improvement techniques and membrane construction.
Quality is everything to us and thanks to our high level of experience and expertise we can provide the entire process from design to implementation all under one roof. Cofra, and its sister company Geotechnics, is part of the internationally operating company Royal Boskalis Westminster. Cofra is active in specific sectors of civil engineering, ground improvement techniques and geotechnical hydraulic and gas barriers. Cofra is always working on the development of new ground improvement techniques. Other Cofra techniques:
  • AuGeo
  • HDPE seals
  • BeauDrain(-S)
  • Vertical drainage
  • Geolock