RU2475597C1 - Method to protect sunk buildings and structures against retaining flood with groundwater and device for its realisation - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method to protect sunk buildings and structures against retaining flooding with groundwater consists in the fact that a distribution-filtration sand cushion is formed under the entire structure. It is equipped with an injection-washing system, with the help of which the cushion body is cleaned from clayey particles of natural mudding by groundwater washing having underwashing speed of filtration, which is developed by injection of compressed air under a foot of the underground part of the structure.

EFFECT: provision of preservation of protective properties of a distribution-filtration sand cushion against retaining flooding of an underground part of buildings and structures for the entire period of their operation, provision of preservation of natural hydrological conditions of a development area.

2 cl, 3 dwg

Description

The invention relates to the construction of buildings and structures (ZiS), namely, mainly to methods for their protection against retaining groundwater flooding of their underground parts.

A known method of protecting buried structures from retaining groundwater flooding, including the formation in highly compressible dusty clay soils of a distribution-filtration sand cushion under the entire underground part of ZiS (RF Patent No. 2385385, class E02D 31/02) - 1.

The disadvantage of this method is the fragility of the protective function of the distribution-filtration sand cushion (RFPP) in highly compressible dusty-clay soils from backwater flooding by underground waters of the underground part of ZiS with its natural mudding by clay particles in the filtering water stream, which occurs in less than 15 ... 30 years ( depending on the operating conditions of ZiS). The minimum life of the designed capital ZiS is at least 75 years.

The objective of the invention is to preserve the protective function of the distribution and filtration sand cushions in highly compressible dusty clay soils from retaining groundwater underground groundwater ZIS for the entire period of their operation.

To solve the problem in the known method, which consists in the fact that when a distribution and filtering sand cushion is formed under the entire structure in highly compressible dusty-clay soils, it is equipped with a pressure-washing system, with which the pillow body is cleaned of clay particles of natural mudding by ground washing water having a suffusion filtration rate, which is created by injection of compressed air under the sole of the underground part of the structure.

A device for protecting buried buildings and structures from underground flooding by groundwater contains a pressure-flushing system in the form of columns installed vertically over the entire area of the pillow with a square grid with a side of squares of 1500 ... 2000 mm, and the columns are installed to the entire depth of the pillow with deepening in the mainland 100 ... 150 mm and are made integral in the lower part, with a height of 250 ... 300 mm with a blind bottom, and above, to an established groundwater level, have a perforated surface equipped with a strainer, and erhnyaya of the column is closed with a lid flange sealingly secured therein a branch pipe conduit and the compressed air input into the pipeline sewer cleaning water which are placed in the trays above the columns in their alignment poryadno.

The essence of the invention is illustrated by drawings, which depict:

- figure 1 is a diagram of a vertical section of a pillow in the alignment of columns;

- figure 2 - arrangement of columns with a system of pipelines of compressed air and sewage flushing water in the volume of distribution and filtration sand cushion;

- figure 3 is a structural diagram of the column.

To perform the method, columns 2 are installed vertically in the body of the pillow 1 over the entire area of the pillow with a square grid with a side of squares of 1500 ... 2000 mm and with the deepening of their entire part 3 in the mainland 4 to a depth of 100 ... 150 mm. Pipeline 5 of compressed air with a diameter of up to 32 mm and a sewage piping of washing water with a diameter of 100 ... 150 mm are placed in trays 7 made in floor 8 of the underground part of structure 9. Column 2 is made of a pipe with a diameter of 100 ... 150 mm and has a solid part 3 at the lower end 250 ... 300 mm high with a blank bottom 10, in the middle part 11 the column is perforated to a steady ground water level WL and equipped with a strainer 12. The upper end of the column 2 is hermetically closed by a flange cover 13 with a pipe 14 of the compressed air pipe 5 and an inlet 15 m in the sewer pipe 6 of the wash water.

The method is as follows.

To clean the distribution and filtration sand cushion 1 from clay particles of natural flow mud during filtration of groundwater of the continental soil 4, compressed air is introduced into it through the nozzle 14 of the injection and washing column 2, which enters the pillow 1 through the perforated part 11 of the column 2 and, rising to the sole 16 of the underground part of the structure 9, creates pressure in the pore space of the cushion 1, providing for the displacement, from top to bottom, of ground water with a suffusion rate of the filtration flow.

Ground water with suffusively washed clay particles from the body of the cushion 1, according to the physical law of least resistance, enters the columns 2 and is discharged through the inlet 15 into the sewage pipe 6 to the design drain.

A sign of the beginning of the suffusion washing of the pillow 1 is the increasing turbidity of the washing ground water, and the end of the washing is the restoration of its transparency. The pillow is cleaned periodically as needed.

Thus, the proposed method ensures the preservation of the protective properties of the distribution and filtration sand cushions from retaining flooding of the underground part of ZiS for the entire period of their operation and, in addition, ensures the preservation of the natural hydrological conditions of the construction area.

Claims (2)

1. A method of protecting buried buildings and structures against backflooding by groundwater, which consists in forming a distribution and filtration sand cushion under the entire structure, characterized in that it is provided with a pressure-flushing system, by which the cushion body is cleaned of clay particles by natural mudding by washing with ground water having a suffusion filtration rate, which is created by injecting compressed air under the sole of the underground part of the structure. 2. A device for protecting buried buildings and structures against backflooding by groundwater, containing a pressure-flushing system in the form of columns installed vertically over the entire area of the pillow with a square grid with a square side of 1500 ... 2000 mm, and the columns are installed to the entire depth of the pillow with a depth of the mainland soil is 100 ... 150 mm thick and is made integral in the lower part, with a height of 250 ... 300 mm with a blind bottom, and above, to an established groundwater level, they have a perforated surface equipped with a mesh filter m, while the upper part of the column is closed hermetically with a cover flange secured therein a branch pipe conduit and the compressed air entering the sewer pipe the washing water, wherein the compressed air duct and the washing water sewer pipe are placed in the trays above the columns in their alignment poryadno.

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