SU43834A1 - The method of manufacturing sewer and similar pipes - Google Patents

Description

The present invention relates to methods for the manufacture of sewage and similar pipes by centrifugal pumping.

Sewage pipes must meet the following basic conditions: 1} they must have sufficient mechanical strength to withstand the static load of the soil and the dynamic loads from transport, 2) be acid resistant and not collapse under the action of wastewater and groundwater, and 3) waterproof.

At present, concrete, reinforced concrete and ceramic pipes are used to build sewers. Reinforced concrete and concrete pipes, having sufficient mechanical strength, are completely unsatisfactory in terms of acid resistance and water resistance. Ceramic pipes, which satisfy the second and third conditions, i.e., acid resistance and water resistance, are completely unsatisfactory in terms of resistance to mechanical loads, since they can withstand only 60-75% of the normal load. Due to the poor resistance of ceramic pipes to mechanical loads, the latter, when laying, must be embedded in a reinforced concrete casing, which significantly increases their cost.

Infusion w, her invention means the manufacture of pipes that meet all the required conditions and combine the polite qualities of reinforced concrete and ceramic pipes.

According to the proposed method, the mass used for the manufacture of sewage pipes is made up of finely ground brick and coal tar pitch with or without asphalt and asbestos. The addition of asphalt is not necessary, since, although the latter, due to the presence of natural bitumen, creates a somewhat greater mechanical strength and better resistance to impacts, it also affects the acid resistance of the mass at the same time.

The addition of any fibrous substances, such as, for example, fibrous asbestos (and an amount of 2-4 °;) significantly increases the strength of water pipes.

In the manufacture of pipes, 60-70 ° / Q of ground brick (battle and marriage), 40-ZO / O coal tar pitch and O-10 ° / Q asphalt are loaded into a special mixer or into an ordinary boiler for asphalt boiling. After boiling down, the mass has a completely homogeneous structure, since the small brick is completely soaked with pitch. Then the mass, at a temperature of 140-160 °, is loaded on the inclined chutes in, rotating

in a horizontal position at a speed of 150 rpm Under the influence of centrifugal force, the mass spreads in an even layer along the entire length of the mold, after which the rotation speed is increased, as a result of which the mass is finally molded into a hollow cylinder with uniformly compacted walls and a smooth shiny internal surface.

After 15-25 minutes, depending on the wall thickness, rotation speed, ambient temperature, etc., the form is removed from the machine, disassembled and removed from the latter the finished product.

The mechanical strength of the pipes manufactured by the proposed method is greater than the strength of not only ceramic, but also concrete pipes, cubes of brick-pitch mass withstand the compressive load of 500 KZJCM, and the eight with a tension of 35 - 40 KZJCM; The pipes are acid resistant and waterproof. The volume weight of brick-pitch pipes is 2.01, and the cost is equal to the cost of a concrete pipe of similar dimensions. At normal wall thickness, brick-pitch pipes withstand a hydraulic pressure of 10 atm, while introducing the above-mentioned dabavok can withstand a much greater internal pressure.

The subject matter of the invention.

A method of manufacturing sewer and similar pipes by centrifugal casting, characterized by the use of a mass composed of finely ground brick and coal pitch with the addition of asphalt or asbestos, or without such addition.