RU2285857C2 - Method of coating inner side of pipeline - Google Patents

Abstract

FIELD: pipeline engineering.

SUBSTANCE: method comprises assembling combined hose that has hose made of reinforcing material and outer film hose. The reinforcing material of the hose is impregnated in two stages. First, the binder is supplied from the face of the hose until the plug inside its inner space is formed, and, second, the inner space of the film hose is evacuated in the region of the plug from the side opposite to the roller device through which combined hose with the binder passes.

EFFECT: enhanced quality of impregnation of the reinforcing material.

2 ex

Description

The invention relates to construction and can be used in the repair and construction of pipelines in the urban sector, industry and other fields, in particular, for water supply and sewage.

A known method of manufacturing a pipe lining, consisting of a woven sleeve, the outer and inner tubular films, by introducing an impregnated cladding into the pipeline to be rehabilitated, fitting shut-off plugs at both ends of the lining, inflating the lining, attaching a reservoir with resin at one end of the lining to the cavity between the tubular films attaching a vacuum pump at the other end of the lining to the cavity between the tubular films; impregnating the fabric with resin in series from one end of the lining to the other end under vacuum and curing of the resin (German patent No. 4306516, microliter F 16 L 11/04, 1994).

The method allows to mechanize high-quality impregnation of the woven sleeve, however, in the case of using non-woven material as a reinforcing layer, the implementation of its impregnation over a long length in the pipe being repaired is difficult due to the insignificant thickness of the reinforcing layer and the formation of “pockets” with a binder between the inner tubular film and the reinforcing layer, which leads to a change in the geometry of the pipe, uneven impregnation and lowering the quality of the lining.

The closest analogue of the claimed invention in technical essence is a method of manufacturing a coating for the inner surface of the pipeline, comprising assembling a combined sleeve by laying a sleeve of reinforcing material in an outer film sleeve, introducing an auxiliary sleeve-container over its entire length, feeding the polymer binder into it until it is completely filled , impregnation of the sleeve from the reinforcing material in two stages: at the first stage - by removing the sleeve-container with simultaneous extrusion of the binder into the cavity sleeves, and on the second - by passing the combined sleeve with a binder through the roller device, and placing the inner film sleeve in the sleeve of the reinforcing material with its eversion under pressure (RF patent No. 2125680, class CL F 16 L 58/10, 1999) .

This method provides a uniform distribution of the binder along the length of the sleeve, but not along its perimeter, which is reflected in a decrease in the stability of the physicomechanical properties of the coating.

The task to which the invention is directed is to improve the quality of the coating by uniformly impregnating with a binder a sleeve of reinforcing material in its volume. Another type of technical result, the preparation of which can be achieved by the invention in comparison with the closest analogue, consists in simplifying the technology of impregnation of a sleeve of reinforcing material and increasing the adhesion of the coating to the inner surface of the pipeline when applied by turning it out.

To achieve the specified technical result, the proposed method involves assembling a combined sleeve by laying a sleeve of reinforcing material in an outer film sleeve and two-stage impregnation of a sleeve of reinforcing material: in the first stage, the impregnation is carried out by introducing a polymer binder from the end of one end of this sleeve to obtain a cork from the binder in its inner cavity, and in the second stage, the inner cavity of the film sleeve is evacuated in the region of the tube from the side opposite to the roll mouth the material through which the combined sleeve with a binder is passed.

The essential features of the claimed invention that are distinctive from the closest analogue are: “in the first stage, the binder is introduced from the end of one end of the sleeve until a cork is obtained in the inner cavity of the sleeve from reinforcing material”, and “the second stage is vacuumized before the impregnation of the inner cavity of the film sleeve in the region of the tube, opposite to the roll device. "

The invention is illustrated by the following description of its implementation.

The combined sleeve is made of a roll of reinforcing non-woven material laminated on one side with a polymer film, stitching end-to-end, followed by welding of the sealing strip from the polymer film. Then the sleeve is impregnated along the entire length of the epoxy, polyester, polyurethane or other polymer composition of hot or cold curing. To this end, the binder is first introduced inside from the end of one end of the sleeve of reinforcing material until a cork is obtained in its inner cavity, while in the region of the cork, the reinforcing material is also less impregnated with the formation of two internal cavities of the film sleeve isolated from one another. Then this end of the combined sleeve is tucked into the roll gap of the roll device, the inner cavity of the outer film sleeve is evacuated in the region of the cork from the side opposite the roll device, having previously isolated it from the surrounding space, and the sleeve with the binder is passed through the roll device. In this case, the binder tube under the pressure of the rolls and under the action of vacuum in the inner cavity of the film sleeve behind the tube easily moves to the other end of the cavity, impregnating along the sleeve of the reinforcing material. The binder is distributed evenly along the entire length and around the perimeter of the sleeve. The amount of clearance in the rolls provides the required wall thickness of the sleeve. Thus, the combined sleeve is ready for application by eversion on the inner surface of the pipeline.

The parameters of the method.

Example 1

The combined sleeve with a diameter of 200 mm and a length of 60 m is made of felt based on polyamide fibers, duplicated with the outer layer of polyvinyl chloride. 420 kg of the epoxy-based polymer composition are introduced from the end of one end of the sleeve to form a plug from the binder; the impregnated end is filled into the roll device and the inner cavity of the outer film sleeve is evacuated from the side opposite to the roll device, having previously inserted a cylindrical fixture connected to the vacuum pump into the sleeve cavity of the reinforcing material and securing the end of the combined sleeve to it. At a residual pressure of 0.1 atm, a combined sleeve with a binder is passed through a gap of 20 mm. The binder is evenly distributed over the volume of the sleeve of the reinforcing material (there are no bright spots on the outer layer of the product).

Example 2

The combined sleeve with a diameter of 400 mm and a length of 150 m is made of felt based on polypropylene fibers, duplicated with a layer of low-pressure polyethylene film. 1800 kg of binder is introduced from the end of one end of the sleeve to obtain a cork. Further, the method is carried out similarly to Example 1, but the impregnation is carried out sequentially in sections to the other end of the sleeve, and the cavity of the next section of the film sleeve is isolated from the cavity of the non-impregnated section of the sleeve by three bends of the combined sleeve and vacuum by introducing an element of the vacuum system into it. At a residual pressure of 0.2 atm in the cavity of the vacuum section of the film sleeve, the element of the vacuum system is removed and the notch is sealed with a self-adhesive tape. Flat-folded after passing through a 25 mm gap between the rollers, the sleeve is laid with hoses on the platform. The impregnation result is the same as in Example 1.

Thus, the proposed method allows to improve the quality of the coating, to simplify the technology of impregnation of the sleeve of the reinforcing material and to increase the adhesion of the coating to the inner surface of the pipeline due to its contact with the binder during coating by turning out.

Claims (1)

A method of manufacturing a coating for the inner surface of the pipeline, including assembling a combined sleeve by laying a sleeve of reinforcing material in an outer film sleeve and two-stage impregnation of a sleeve of reinforcing material by introducing a polymer binder into the cavity of this sleeve in the first stage and passing the combined sleeve with the binder through a roller device in the second stage, characterized in that in the first stage, the binder is introduced from the end of one end of the sleeve of reinforcing material until cork from the binder in its inner cavity, and before impregnation in the second stage, the inner cavity of the film sleeve is evacuated in the region of the cork from the side opposite to the roller device.