The structures of the water supply and sewage in the conditions of permafrost differ from the normal conditions of production of work in some features.
In addition to topographic survey of the water supply or sewage, geological reconnaissance of soil with pits is performed to a depth of at least 8 m, the temperature of soils with soil thermometers at a depth of 0.80, 1.50 and 5.20 m every 5 days, if not within a whole year, is measured then for the period of July, August, September and October.
On the longitudinal profile of the water supply route, in addition to conventional technical data, it is necessary to note the boundaries of the moss, peat and shrub cover, as well as the surface of eternal permafrost.
A year before laying the pipes network, the stripes of the Thrsus strip with cleaning herbal, peat and blasting are carried out and with a clearing device in a wooded area.
Opening of trenches for laying pipes is done in June, preparing beds for pipes and laying them are performed in July, and the final filling of the pipes is carried out in August, when the temperature of the soil in the dumps reaches the maximum.
The depth of stacking pipes is usually taken at least 3 m and pipes can be cast -iron or wooden normal varieties. In frozen floating soils, it is recommended to lay pipes in embankments, and in stunned places – on stilts or beds with sprinkling with their soil; With long pipelines at low points, taps are arranged for lowering water from the network.
The pipe bed is made of sandy and gravel soils, and the pipe pipe is filled with two -diameters thickness with draining soil.
In excess of the drainage sprinkling, the pipes are filled with cash with soil from dumps and reserves along the highway, and the latter are waterproofing for surface water. To improve the thermal conditions of the waterway, the thermal land reclamation of the strip along the highway is about 20 m wide, which consists in cleaning the moss, grass cover and the signs of drainage ditches, and in winter, snowy low shields are installed in winter or a shaft of sand of about 0, about 0, about 0, about 0, about 0, about 0, about 0, about 0. 5 m.
Ice is diverted from the pipeline highway with deep ditches, which also protect it from the influx of groundwater from the sinking side.
To observe the correctness of the pipeline, audit wells are arranged along it after 100 – 200 m with double lids and thermal insulation between them of sand, peat, grass or straw.