Wound tube made of profiled plastic strips

Abstract

A wound tube is made of profiled plastic strips, the profiling of which comprises at least the edge region. The edge region is designed such that edge regions of successive coils, the edge regions lying mutually adjacent during winding, can be connected in a form-fitting manner, and at least one of the surfaces of the plastic strips has ribs projecting perpendicularly essentially to one side in order to form a flat inner surface during winding. The tube wall of the wound tube is designed as a double wall and is assembled from a first inner plastic strip and from a second outer plastic strip, wherein the ribs projecting perpendicularly essentially to one side fix the distance of the outer plastic strip from the inner plastic strip. A device with which such wound tubes can be advantageously produced on-site is also provided.

Description

BACKGROUND AND SUMMARY[0001]The present application is a divisional of U.S. application Ser. No. 13 / 392,809, filed Feb. 27, 2012, which is the U.S. national stage of international Application No. PCT / EP2010 / 062650, filed Aug. 30, 2010, which claims priority to DE102009043932.3, filed Sep. 2, 2009, all of which are incorporated by reference.[0002]The invention concerns a wound tube made of profiled plastic strips whose edge regions are designed such that when winding contiguous edge regions of the plastic strip of two successive windings [said windings] can be connected in a form-fitting manner and in which at least one of the surfaces of the plastic strip has ribs that essentially project, orthogonally and are equally spaced.[0003]Wound tubes made of plastic strips are used in the restoration of waste water channels and are produced on site. In a process disclosed in EP 2 085 29 A1, DE 696 27 426 T2 or DE 696 35 214 T2 the tube is made in the waste water channel whereby the assemble...

AI Technical Summary

Benefits of technology

The double-walled design significantly increases the stability of the wound tube, simplifies production, and allows for on-site assembly without the need for complete filling, ensuring a secure and efficient restoration of wastewater channels.

Problems solved by technology

In such wound tubes poor stability, at least in large diameter tubes, is a disadvantage.

By including radially projecting ribs on the outer surface of the plastic strip forming the outer wall, stability can be increased, however, here, too, the diameter for stable wound tubes is limited.

This means production is restricted to one plastic band with a uniform cross-section and only spools of identical plastic strips with a uniform cross-section are required on site.

This results in a difference in length between the outer plastic strip and the inner plastic strip.

In doing so, the surface of the plastic strips can pick up dirt, which can impede the latching of the ribs and the edge regions.

In case of deep channels the suspended load of the plastic strips that are fed to the winding assembler through the revision shaft can become so high that it might affect the teed process.

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