Chrysotile Cement Pipes: Types, Installation, Use In Construction

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Chrysotile Cement Pipes: Types, Installation, Use In Construction
Chrysotile Cement Pipes: Types, Installation, Use In Construction

Video: Chrysotile Cement Pipes: Types, Installation, Use In Construction

Video: Chrysotile Cement Pipes: Types, Installation, Use In Construction
Video: Pipe Installation 2024, March
Anonim

Despite the fact that the production of asbestos-containing building materials is prohibited in some countries, in Russia chrysotile cement, which has truly unique physical and chemical properties, is used for the manufacture of roofing materials and pipes, which are widely used in engineering networks, sewer and drainage systems. garbage chutes.

Chrysotile cement pipes: types, installation, use in construction
Chrysotile cement pipes: types, installation, use in construction

General information about chrysotile cement

The composite material chrysotile cement, which previously had the trade name asbestos cement, is obtained by hardening a mixture consisting of water, Portland cement and chrysotile. The ratio of Portland cement in the finished material can be from 80 to 90%, chrysotile - from 10 to 20%. This material possesses unique properties due to the fact that chrysotile, which is popularly called "mountain flax", is able to split into the finest fibers with increased tensile strength, elasticity, elasticity, high adhesive and cohesive properties. These fibers reinforce concrete, increasing its strength and resistance to any external influences.

Chrysotile cement, in which chrysotile fibers are bound, preventing their release into the environment, is safe. In addition, chrysotile in its composition does not react with the alkaline medium of the cement stone, therefore the material has increased resistance to corrosion. It is fireproof, not susceptible to putrefactive bacteria, and can withstand acidic environments for a short time. In addition, chrysotile cement is a reliable insulator of electric currents, electromagnetic and radioactive radiation, it is characterized by low thermal conductivity and can withstand exposure to high temperatures. Today the industry produces the widest range of chrysotile cement products, including pipes that are used in construction.

Types of chrysotile cement pipes

Chrysotile cement pipes are distinguished by operating conditions: gravity and pressure. In addition, there is a gradation in size: the diameters of the inner section can be from 100 to 500 mm, the length - from 2950 to 5950 mm. Non-pressure pipes are produced in two types - conventional, marked with BNT and thin-walled, marked with BNT. Chrysotile cement pressure pipes are divided according to purpose. Those that are used for water pipes are marked BT, and those intended for heat pipelines are designated TT. Depending on the value of the design working pressure, they are divided into several classes and can be used in the absence of external loads in conditions from 0.3 to 1.6 MPa.

Chrysotile cement has a low coefficient of thermal elongation, its linear dimensions do not change even at high temperatures.

Installation of chrysotile cement pipelines

When installing pipelines from free-flow chrysocyl-cement pipes intended for laying communication cables, sewer or melioration systems, one scheme is used: preparation of a trench, drainage or diversion ditch; delivery of pipes and couplings to the place of laying; control of their quality; installation of the pipeline; tightness or permeability tests; backfilling of the pipeline.

Chrysotile cement pipes and couplings are sensitive to mechanical damage and shock, so they are installed with caution, preferably in manual mode.

The pipes are connected to each other using chrysotile cement or polyethylene couplings, which are mounted on a concrete solution, bitumen, special mastic or a binder solution. Better sealing when laying pipelines in wet soils can be achieved using hot bitumen. In normal dry soils, polyethylene couplings have proven themselves well, which, before being installed on the ends of the pipes, are heated to 90-100 ° C.

For the installation of pressure chrysotile cement pipes, which are often used in conjunction with steel pipes, flanged joints or chrysotile cement couplings are used, and the ends of steel pipes are pierced or welded to them with nozzles-nozzles that coincide with the outer diameter of the chrysotile cement pipe.

Application of chrysotile cement pipes

In Russia, where the manufacture of asbestos-cement pipes began back in 1932, a great deal of experience has already been accumulated in their use in various fields, including construction. Their popularity is due to their low cost, because the price of such pipes is 2-3 times cheaper than metal and polymer ones, and their service life is more than 50 years. In addition to pipelines for various purposes, chrysotile cement pipes are used as garbage chute trunks and as support pillars for the construction of pile foundations, as well as casing pipes for wells. Septic tanks and storage tanks for solid waste in autonomous sewage systems are another area of application for this material. Drainage systems are made from chrysotile cement pipes - for this, holes are made over their entire surface or only part of it.

In our country, scientific organizations engaged in sanitary and epidemiological research have studied the possibility of using chryotil-cement pipelines for heat and hot water supply systems. It was scientifically proven that in terms of its organoleptic, chemical and bacteriological properties, the water did not change after passing through such pipelines, which was confirmed by the relevant certificates.

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