Construction of the drainage system of the territory of the State Department of Public Utilities of kindergarten No. 113 in the city of St. Petersburg, approx. Bolsheviks, 61, building 4, lit. And.

Water supply and sewerage.

Schematic symbols.

Schematic designations of elements of sanitary devices on the drawings are accepted as per GOST 21.60203, GOST 21.20693, GOST 2.78496, GOST 2.78570.

Basic solutions,

The initial data for the development of detailed documentation of the drainage system was: - the design task

The project provides for a systematic drainage system consisting of four drains of dryers, one drains of the collector, it is also a drain collector.

Drains dryers, drains collector and drains collector are structurally solved according to closed tubular drainage scheme. Drains dryers are made of high-strength cast iron pipes with spherical graphite with perforation of Ǿ150kh20 mm (round), drains collector, collector of Ǿ250kh25 mm. (round) as per GOST 841174 *. The distance between drains by dryers is 17 m, which allows you to effectively drain this area. The area of ​ ​ the drained area is 3800 m2. Sewage (drainage) wells according to the standard design 9020922.84 album 2 are installed on the drain collector at the drains dryers connection points.

Drain water shall be discharged to the nearest existing drain pit as per specification.

Drains pipelines are laid on an even gravel base of a trench with a height of 150 mm, with a slope of 0.004 units, and filled with gravel of fraction No. 8 with a height of 1 m, the gravel fraction depends on the diameter of the drainage holes in ceramic pipes, it must exceed the diameter of the holes in the pipe, so as not to get into and clog the drainage pipeline.

The pipeline crossing of the walls of the sewage pit is provided in a case of reinforced concrete pressure-free pipes Ǿ600mm. as per GOST 648288. The ends of the case in the well are sealed with concrete, the space between the pipe and the case is clogged with mortar .

The requirements of SNiP 12.042002 "Occupational Safety in Construction" shall be met during the construction of the external drainage system.