GB2127125A

GB2127125A - Reinforced lining material

Info

Publication number: GB2127125A
Application number: GB08322516A
Authority: GB
Inventors: Eric Wood
Original assignee: Edgealpha Ltd
Current assignee: Sewer Services Ltd
Priority date: 1982-09-14
Filing date: 1983-08-22
Publication date: 1984-04-04
Also published as: CY1394A; GB2127125B; GB8322516D0

Abstract

A lining material 10 for the lining process described in British patent 1449455, is provided with internal strips 20 of resin absorbent material to provide extra hoop strength. <IMAGE>

Description

SPECIFICATION Lining materials with reinforcing bands This invention relates to lining materials, especially but not exclusively to lining materials for the lining of underground pipelines and passageways.

In our British Patent No. 1449455 there is described a method of lining underground pipelines and passageways wherein a tubular lining material is everted into the pipeline of passageway in order to line the surface of same. The eversion is achieved by the use of a liquid, suitably water, which is of the name or approximately the same specific gravity as that of the lining material, so that the lining material will be buoyantly supported in the water as the eversion takes place.

The lining material described is felt material of tubular construction, in one or more layers, to make up the required thickness, and the outer surface of the felt tube or the outer surface of the outer layer of the felt tube is coated with a liquid impermeable membrane of synthetic plastics material. The lining material may be made by wrapping webs into tubular form and making appropriate seams, or may be formed by making tubular felt structures and coating the tubular felt structures with the coating membrane. The felt is thoroughly impregnated with a curable synthetic resin and before the resin cures, and whilst the lining material although heavy is still quite flexible, it is everted into the pipeline or passageway.The lining is held in the passageway lining condition until the resin cures, when the lining material becomes in effect a free standing pipe lining the pipeline or passageway. In order to assist or accelerate the cure of the resin, hot water may be circulated through the lining material when it lines the pipeline or passageway surface, and the hot water may be circulated through a perforated hose line located centrally of the lining material.

Because these linings are used for the repair of delapidated and badly corroded sewers, there is continuously a need for making the linings as strong as possible to resist collapse resulting from the pressure of the surrounding water table, and the present invention is concerned with constructing lining materials of the nature described above to provide such materials with more circumferential strength so they will better resist collpase which normally results from buckling.

In accordance with the invention, the lining material is provided additionally with internal strips of resin absorbent material to provide extra hoop strength. The strips of material may be arranged helically or purely circumferentially and the coils thereof are spaced axially of the lining material tube.

When the lining material is constructed by coiling the web material into circular form, the said strips may be applied to the web material before the said coiling takes place, and where the strips are of synthetic felt, the said strips may be applied by flame bonding or adhesive, or other means such as by stitching.

The strips provide extra circumferential strength, and if it desired, in the finished lining, that the thickness of the lining between the strip coils should be made up to the thickness of the material at said strip coils, a grouting material may be injected into the lining material before it is everted, and after the felt has been impregnated with a curable resin. The said grouting material may comprise a mixture of "Fluke" (Trade Mark), cement, water, and thixotropic material such as "Silodex" (Trade Mark), suitably in the proportion three parts Fillite, one part cement, sufficient water to make a fluent slurry, and sufficient Silodexto make a gell like grout.

The grout material may be omitted where it is acceptable for the finished lining to have ungulations in the regions of the strengthening strips.

An embodiment of the invention will now be described, by way of example, with reference to the accompanying diagrammatic drawings, wherein: Figure 1 is a perspective view illustrating the manufacture of the lining material according to the invention; Figure 2 is a diagrammatic view showing how the felt of the lining material is impregnated with a curable resin; Figure 3 is a diagrammatic view showing how the grout material is introduced into the lining; and Figure 4 illustrates how the lining is applied to an underground pipeline or passageway surface.

Referring to the drawings, in Figure 1 a lining material 10 starts off as web comprising a layer of synthetic resin as felt 12 to which has been bonded a coating material 14 to provide a composite web. The composite web is coiled as shown to provide a tubular structure 16, suitable jointing being provided at the seam 18, but before the coiling of the web, strips 20 of the same felt are applied transversely of the web to provide local thickening for extra strength, and when the web is coiled and seamed, the said strips form internal hoops of reinforcement.

The coiling is performed so that the membrane lies to the outside of the completed tube 16.

Tipically, the felt web 12 may be of the order of six millimetres thick, and the additional strips 20 may be of three millimetre thickeness, although strips of appropriate thicknesses will be selected depending upon the anticipated load. When the lining material is to line a passageway, resin 22 is pumped into the interior of the lining material as shown in Figure 2 so as to impregnate the felt, effective impregnation being achieved by passing the material between nib rollers 24, and if in the finished lining ungulations which will be caused by the strips are acceptable, then the lining may be inserted as shown in Figure 4 to line the pipeline or passageway 26. However, if it is desired to make the finished lining of even thickness throughout its length, a fluent grouting material 28 as described above, and as shown in Figure 3 may be inserted into the interior of the lining material. This grouting material does not displace the resin 22 from the felt 12, but merely fills the gaps between the strips 20 which gaps would normally cause the lining to be of reduced thickness.

Whilst the grouting material and resin are still soft an fluent, the lining is inserted into the passageway as indicated in Figure 4, and as described in detail in the said Patent No. 1449455.

Claims

1. A lining material for a process as herein described, wherein the lining is provided additional with internal strips of resin absorbent material to provide extra hoop strength.

2. A material according to Claim 1, wherein the strips of material are arranged helically or circumferentially, and the coils thereof are spaced axially.

3. A material according to Claim 1 or 2, wherein the strips are applied to the web material before the coiling of same into circularform.

4. A material according to Claim 1,2or3, wherein the strips are applied by flame bonding or adhesive, or other means such as by stitching.

5. A material according to any preceding Claim wherein a grouting material is injected into the lining material before it is everted between the strips.

6. A lining material substantially as hereinbefore described with reference to the accompanying drawings.