METHOD OF REPAIRING PIPELINE IN FLOODED AREA AND CAISSON FOR ITS IMPLEMENTATION Russian patent published in 2017 - IPC F16L1/26 E02D23/00 

FIELD: construction.

SUBSTANCE: at least four caissons are delivered to the site of a selective repair and are sequentially mounted on a pipe upside down by means of support rollers, fixed to the pipe by a belt, then the caissons are set in the working position by turning them by 180°. From the caisson sluices and the working space of the chambers, water is pumped by a pump. In the first caisson, the pipe section is cleaned of the old insulation. In the second caisson, corrosion foci are removed from the area cleaned of the old insulation, small repairs of the pipe surface are made, and flaw detection is performed. In the third caisson, the pipeline section is blown and dried, and a protective coating is applied to it. In the fourth caisson, the output quality control of the coating is carried out, double blowing and drying of the treated pipe section are carried out. The column of caissons is moved along the pipe, and the described cycle of works is repeated on the next section of the pipe in the first, second, third, and fourth caissons until defects are eliminated throughout the pipeline, after which the caissons are dismantled. Wherein, at the initial stage, the works are performed only in the first caisson, and the column is moved, then the works are performed in the first and the second caisson, then in the first, the second and the third caisson, and then in each caisson. The design of the caisson is also proposed.

EFFECT: high-quality and eco-friendly repair without lifting the pipe above the water mirror due to the consistent performance of works in several caissons.

5 cl, 3 dwg