A thermal special composite casing device

Abstract

The invention relates to a special composite casing device for thermal power, which comprises a casing, a sealing sleeve and a buckle; the casing is sheathed at the place where a thermal pipeline passes through a wall or a well wall, and the middle part of the outer wall of the casing is integrally connected to water blocking Overflow, water-retaining overflow is poured in the wall or well wall; when the shell is located outside the wall of the underground well, one end of the sealing sleeve is fixedly connected to the shell, and the other end is integrally connected to the buckle, and the buckle is fastened to the outside of the thermal insulation layer. protective tube. The invention can be directly applied to the surface of the outer protective layer of the prefabricated directly buried thermal insulation steel pipe without destroying the thermal insulation layer of the working pipe, protects the integrity of the prefabricated directly buried thermal insulation pipe, prevents the corrosion of the working pipe due to water immersion, and prolongs the service life of the thermal pipeline , The on-site construction is convenient, the efficiency is improved, and the construction period is shortened.

Description

technical field [0001] The invention belongs to the technical field of heat supply, and relates to a novel thermal special composite casing for a thermal pipeline and a manufacturing method thereof. Background technique [0002] At present, when the thermal pipelines in the heating field pass through various valve wells (section valve wells, metering wells, drainage wells, building entrance wells), walls of buildings such as heating stations, the thermal waterproof casings used are all Steel products manufactured by traditional machinery have the characteristics of poor corrosion resistance and simple forming structure. [0003] There are two types of rigid waterproof casing made by machinery. One is the traditional pre-installed rigid casing at the position where the pipeline passes through the wall hole. After the pipeline is constructed, the gap between the casing and the pipeline is tightly filled with linseed, asbestos and cement. , tamp and seal. The other is the hea...

AI Technical Summary

Problems solved by technology

These two casing types have certain defects in the actual operation of thermal pipelines. The first method is suitable for municipal water supply and drainage and other non-flexible pipelines. The seal between them will be destroyed and the waterproof requirement will not be met.

Especially in underground valve wells, the valves, instruments and other devices in the well room are soaked in water for a long time, the service life is shortened, the valve opening and closing and the accuracy of the instruments are damaged, and the maintenance cost increases

Although the second method is widely used at present, the disadvantage is that it destroys the integrity of the thermally prefabricated direct-buried thermal insulation pipe. After the casing is welded on the surface of the steel pipe, it is necessary to carry out a second artificial insulation treatment on the steel pipe. There are no effective measures to deal with the gaps between the walls, especially when there is displacement of the thermal pipeline, water will soak into the space between the steel pipe and the insulation layer from the surface of the outer well wall and the outer wall surface, and one side will be corroded under high temperature operating conditions The steel waterproof casing in the well wall shortens the service life of the casing

On the other side, the thermal insulation pipe is corroded layer by layer, so that the polyurethane insulation material is carbonized and separated from the steel pipe. The corrosion area continues to increase, and the steel pipe skin is also carbonized, and the corrosion degree is strengthened, which seriously affects the service life of the thermal pipe and increases the maintenance cost.

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