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Technical paper: Fundex techniques for forming in-situ reinforced concrete piles

S Doornbos. This paper was first published in GE’s March 1986 edition.


Verstraeten Foundation Techniques in Oostburg, the Netherlands, occupies a special position among the Dutch piling contractors. In the course of its history this company has not only acquired a great deal of experience and know-how in this field, but has also developed various new techniques for the construction of foundations, each of which has its individual advantages and applications. In addition to “normal” piling work, the company is also involved in many projects where foundations have to be made in special conditions or for special applications. Examples of these are driving piles for high-voltage pylons, driving tension piles for the anchoring of vitalis in quays, the installation of bored pile walls and the vibrationless casting of foundation piles in places where normal pile-driving would involve the risk of damage to existing buildings or unacceptable noise nuisance. This vibrationless construction of foundation piles can even be carried out in existing buildings, in tunnels or under existing pipelines on (petro-) chemical plants.

The machinery and auxiliary equipment necessary for these special techniques have been developed by the company itself and are manufactured under its own control.

Although initially the company only manufactured machinery for its own use, Verstraeten has subsequently sold machines under the trade name “Fundex” to interested companies in a number of countries, including Great Britain, West Germany, France, Switzerland, Belgium, Poland, Finland, also to the Middle and Far East, e.g. Japan and China.

In addition to supplying equipment, Verstraeten also assists its clients by training new crews, providing know-how in the field of soil mechanics and foundation technology, and will give advice on the realisation of difficult projects.

For its innovation and technology in the field of foundation engineering, the company has been awarded with the Dutch King William I Award 1985 (see Ground Engineering, September 1985).

The aim of this article will be to demonstrate the range of Fundex equipment and some of its applications to particular piling problems, as part of a state-of-the-art in Dutch piling technology. 

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