Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Lining
Patent
1989-07-18
1992-04-07
Reese, Randolph A.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Lining
405151, 138 97, E21D 1100
Patent
active
051022630
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates to a method of fixing plastic panels inside large diameter sewers or pipes to renovate and/or protect the pipes from corrosion and or erosion. The invention is particularly suitable for, but not limited to, man-entry, circular and oviform sewers.
(2) Prior Art
Current methods of man-entry sewer restoration include the use of segments of preformed liner (usually of fibreglass) which are winched into place. These methods generally require some excavation and result in significant loss in cross-sectional area. Other methods use a fibre reinforced resin bag which is blown up within the pipe. However, these are expensive and the diameter of pipes to which they can be applied is limited.
SUMMARY OF THE PRESENT INVENTION
It is an object of the present invention to provide a method of lining sewers or pipes using panels which can be easily handled and installed without excavation.
It is a preferred object to provide a method where the panels have gas tight joints.
It is a further preferred object to provide a method where the panels are placed against the existing pipe wall and result in a smooth surface with improved hydraulic performance.
It is a still further preferred object to provide a method where the grout can be easily and accurately placed between the liner and the pipe wall.
It is a still further preferred object to provide a method which is relatively inexpensive.
Other preferred objects of the present invention will become apparent from the following description.
In a broad aspect, the present invention resides in a method of lining sewers or pipes including the steps of:
curving panels around the wall of the sewer or pipe, each panel having a formation along one side edge complementary with a joint formation along the adjacent other side of a second similar panel;
circumferentially butt-joining the panels together to form a liner using the respective formations on the adjacent panels; and
joining the free ends of the panels together with one or more joining strips.
If required, grout may be inserted into the space between the panels and the wall to secure the liner in position.
Preferably each panel has a substantially planar body with a plurality of outwardly directed formations e.g. of y or T section on the outer face of the body. The formations space the body from the pipe wall and may key the liner to the grout.
Preferably each panel has a first joint formation along one side of substantially inwardly directed U-section, which is engageable by a second joint formation along the other side of an adjacent similar panel.
Preferably the second joint formation has an outwardly directed leg engageable in the U-section of the first joint formation.
Preferably the free ends of the panels are joined by female joining strips. Preferably the female joining strip is applied within the cavity between the liner and the wall before any grout is injected into the cavity.
BRIEF DESCRIPTION OF THE DRAWINGS
To enable the invention to be fully understood, a preferred embodiment will now be described with reference to the accompanying drawings, in which:
FIG. 1 is an end view showing the liner being installed in a pipe;
FIG. 2 is a sectional end view, taken on line 2--2 on FIG. 1, showing a liner panel engaged with a joining strip;
FIG. 3 is a sectional end view, taken on line 3--3 on FIG. 1, showing the liner which has been grouted; and
FIGS. 4 and 5 are respective perspective views of the liner panel and joining strips.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG. 4, each panel 10 is extruded of unplasticized PVC (uPVC) and has a planar body 11 with a smooth inner face. A plurality of T-shaped formations 12 are formed integrally with the panel on the outer side of the body. The formations 12 reinforce the body when the panels are curved, space the body 11 from the sewer wall and key the liner to the grout in the cavity between the sewer wall and the liner.
A first joint formation 13 (see FIG. 2) is provided
REFERENCES:
patent: 3169376 (1965-02-01), Cunningham
patent: 3393523 (1968-07-01), Krivda
patent: 3438211 (1969-04-01), Zywietz
patent: 4347018 (1982-08-01), Wrightson et al.
patent: 4585371 (1986-04-01), Jones-Hinton
patent: 4610120 (1986-09-01), Canavesi et al.
patent: 4733629 (1988-03-01), Hunt et al.
Allen Peter
Molyneux Sydney
Danby of North America, Inc.
Reese Randolph A.
Ricci John
LandOfFree
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