Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1986-06-09
1988-08-16
Bell, Janyce A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
118408, 118419, 118DIG10, 156287, 264269, 264516, 405150, 427230, 427239, B32B 3100, B05D 722, B05C 302
Patent
active
047642378
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the construction and maintenance of pipelines, and, more particularly, to the method of coating the internal surface of a pipeline with a cement-sand-mortar and a device for effecting same.
2. DESCRIPTION OF THE PRIOR ART
Today, there are known in the art the method and device for coating the internal surface of pipelines with a cement-sand mortar (cf. e.g., a booklet by the U.S. Ameron company "A Drawing Method of Restoring Pipelies". Instructions A-101 and A-102).
In accordance with this method and device a layer of mortar is applied on the internal surface of the pipeline in the following manner. A piston is installed in a pipeline with an annular clearance. Prior, the piston the pipeline is filled with a cement-sand mortar. With the aid of a rope the piston is drawn along the pipeline, the mortar is forced out into the clearance between the piston and the pipeline forming a layer. Due to viscosity this mortar is retained on the pipeline wall and once solidified, forms a protecting coating.
However, this method can be used for coating the internal surface of pipelines with up to 250 mm in diameter, because in larger dia. pipelines the formed coating is not held on the internal surface due to an insufficient paving and transverse strength of the layer.
Summary of the Invention
It is the main object of the present invention to develop a method and device for coating the internal surface of a pipeline with a cement-sand mortar which would ensure a reliable bond thereof with the surface of the pipeline, thereby creating a durable coating and protecting pipelines of different diameters.
The main object of the present invention is accomplished by a method of coating the internal surface of the pipeline with the cement-sand mortar, comprising the formation of a mortar layer on the inside of the pipeline by way of feeding and distributing said mortar on the internal surface of the pipeline by means of a moving piston, according to the invention, the formed mortar layer is pressed and held on the pipeline surface with the aid of a flexible hose which is held fixed by its turned-out end to the pipeline and, as the hose is gradually turned out, it is fed to the pipeline being pressed to the mortar layer, the hose being laid simulateneously with the formation of the mortar layer.
According to the invention, the flexible hose is fed, turned out and pressed to the formed mortar layer by a flowing medium which is fed to the cavity formed by the turned out portion of the hose. As this occurs, the flowing medium and the portion of the flexible hose being turned out make up a means for moving the mortar and piston along the pipeline.
The holding of the mortar on the pipeline surface by means of the flexible hose prevents the formed coating from falling off the pipeline wall and this, in turn, makes it possible to increase the thickness of the layer of the coating being formed over one stroke of the piston.
The flexible hose improves the quality of the coating because the formed layer is subjected to pressure of the flowing medium (air) through the base which increases the coating strength. The quality of the coating is also improved because the mortar layer is hardened in the hermetic volume and does not crack. By virtue of the flexible hose the flowing medium also serves as a mover for the piston which appreciably streamlines the technology of applying the coating, reduces the amount of equipment used for applying the coating.
Once the mortar has hardened on the pipeline surface, the flexible hose may be taken off by feeding the flowing medium between the hose and the mortar layer and, having secured the second end of the hose to the pipeline, feed it to the next portion of the latter as the hose is gradually turned out.
Removing the hose from the formed coating, upon its solidification, enables one to cover with one hose the subsequent portions of the pipeline over one stroke of the piston. The hose is removed as it simultaneousl
REFERENCES:
patent: 4556580 (1985-12-01), Kamura et al.
patent: 4602974 (1986-07-01), Wood et al.
Kryazhevskikh Nikolai F.
Medunitsa Vladimir L.
Oleinik Viktor N.
Shishkin Viktor V.
Shlatgauer Boris I.
Bell Janyce A.
Trest "Juzhvodoprovod"
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