Static structures (e.g. – buildings) – Footing or foundation type – Concrete type
Patent
1996-09-12
1998-11-17
Wood, Wynn E.
Static structures (e.g., buildings)
Footing or foundation type
Concrete type
52298, 405236, 405239, 427239, 118404, E02D 2732
Patent
active
058361243
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a foundation tube for use as a foundation for masts posts, pillars, etc., wherein perforations or holes are provided in the tube for forcing casting mixture out into the space between the tube and the surrounding substance. The invention also concerns a method for formation of a foundation for masts, posts, etc. comprising at least one foundation tube which is lowered into a pre-drilled hole in the ground, the hole having a diameter greater than the diameter of the tube and where at least the space between the tube and the ground is filled with a casting mixture, e.g. concrete.
A number of different methods are known for manufacturing mast foundations by driving tubes down into the ground, wherein the tubes are filled with concrete and cast in position to form the finished foundation. It is also known in the prior art for such tubes to be equipped with perforations in order to force the concrete out through the tube and into the ground surrounding the tube. In this connection it is also a known procedure to first drill a hole in the ground and then place a perforated tube in the hole, whereupon the tube is cast in position, as the casting mixture is forced out through the perforations, filling the space between the hole and the ground as well as the actual tube. The upper part of the tube is equipped with fastening devices for a pillar, mast or other equipment which has to be secured to the foundation. A plurality of such tubes can also be used jointly for a larger foundation and connected to one another by means of a top plate.
This method of laying a foundation has proved to be very practical, but nevertheless there has been a need for a further improvement of the method.
One of the problems which are encountered in laying a foundation is that in many places there is an extremely corrosive environment at the foundation location, both above the ground and in the ground itself, and this can affect the tube foundation, giving it a very short working life.
Another problem is that in the case of masts, posts, etc. which support live wires or cables, a flashover can easily occur in the foundation, which is considered to be a disadvantage, particularly if this occurs at ground level.
Thus it is an object of the present invention to provide a foundation tube wherein the problems of corrosion are avoided and wherein the foundation tube is designed in such a manner that it can be securely attached to the ground. A further object of the invention is to provide an improved method of laying a foundation, whereby the problems described in the introduction can be remedied to the greatest possible extent, thus enabling an efficient and satisfactory method to be achieved of laying a foundation for masts, posts, etc.
It is also an object of the invention to avoid the formation of electrical bridges between the foundations and post and ground level.
These objects are achieved with a foundation tube of the type mentioned in the introduction, which is characterized by those features indicated in the patent claims. The invention also concerns a method for the formation of a foundation, and the method is characterized by the features indicated in the patent claims.
By providing the foundation tube with an external and internal coating, especially of thermoplastic, the foundation tube is very well protected against corrosive influences. By equipping the coating with a rough surface, a particularly secure attachment is ensured during casting. Thus the foundation tube according to the invention will have a long working life even in an extremely corrosive environment.
When laying a foundation for current-carrying pylons, a corrosion coating also provides an insulating effect. This insulation may be achieved with an extra coating on a clean corrosion coating. On the bottom part of the foundation tube it is advantageous to also provide a coating with a rough surface in order to give the best possible adhesion to the casting mixture. The outermost coating, either the corrosion coating or possibly the insulating
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Aspehaug Nils
Volle Frode Inge
Edwards W. Glenn
Kvaerner Eureka a.s.
Wood Wynn E.
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