Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1987-04-14
1988-05-03
Massie, Jerome
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
118105, 118306, 118DIG10, 156259, 156294, 156330, 1563317, 156344, 156391, 156423, 156575, 156577, 156578, 222103, 222107, 264309, 264311, 264312, 264316, 425262, 425460, B29C 6334
Patent
active
047417951
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of and apparatus for lining pipes, especially but not exclusively underground sewers or other tunnel-like excavations. The present invention is particularly concerned with the relining of existing sewers, expecially but not exclusively such sewers having a diameter within the range of 9 inches to 24 inches (23 cms. to 61 cms.).
The lining composition used with the present invention is preferably a settable, two-shot resin based structural lining material consisting of a resin and a curing or hardening agent.
The resin is preferably an epoxy resin but may alternatively be a polyurethane.
The curing or hardening agent preferably contains inorganic fillers.
The preferred lining composition is a settable two-shot epoxy resin-based one containing inorganic fillers.
It is to be noted however that the resin and the curing or hardening agent may be provided in the ratio of two to one.
For convenience the term "pipe" is used herein and in the claims, save for the descriptions with reference to the drawings which are concerned particularly with lining sewers, but it is clearly to be understood that the term "pipe" includes within its scope sewers, other underground excavations and, in general, any linear hole or passage capable of being lined by the method and apparatus of the present invention.
According to the present invention there is provided a method of lining a pipe comprising the steps of laying along the pipe hose means filled with a predetermined quantity of settable lining composition to be applied against the pipe wall; advancing a centrifugal lining machine along the length of the hose means; axially slitting the hose means in front of the advancing centrifugal lining machine to permit egress of the lining composition from the hose means; and guiding the egressing lining composition into the centrifugal lining machine for application to the pipe wall as it advances along the hose means.
Also according to the present invention there is provided apparatus for lining a pipe with a settable lining composition contained in hose means laid along the pipe, the apparatus being adapted to be advanced through the pipe and comprising a centrifugal lining machine having inlet means for the settable lining composition, delivery tube means connected, at one end, to the inlet means and adapted, at the other end, for insertion into the hose means filled with the settable lining composition, and hose-slitting means at or adjacent the other end of the delivery tube means for axially slitting the hose means as the delivery tube means is urged into the hose means, whereby the settable lining composition can flow from the hose means into the delivery tube means and thence to the centrifugal lining machine.
As essential feature of the present invention is therefore to lay hose means filled with settable lining composition along the bottom of a pipe to be lined and advance a lining apparatus along the hose means which apparatus axially slits the hose means, collects the settable lining composition from the hose means and feeds it to a centrifugal lining machine, which is a part of the apparatus, which centrifugally sprays or throws the settable lining composition onto the pipe wall to line same.
It is preferred to emply to hoses laid in parallel side-by-side relationship, one containing a resin and the other containing a curing or hardening agent (with or without inorganic fillers), and the hoses equalling in length, or substantially so, the length of pipe to be lined.
In this latter preferred embodiment, the axially-slit and emptied hoses remain in situ in the pipe in a flattened condition covered by the lining composition. This is not considered detrimental to the applied structural lining.
In this preferred embodiment, the closed lateral edges of the flattened hoses may be severed and guided away from the hoses and eventually out of the pipe prior to the flattened hoses being covered by the settable lining composition.
The volumetric capacity of each hose is preferably such as to provide
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Grace James C.
Grace John C.
Massie Jerome
Tate Pipe Lining Processes Limited
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