CS200119B1 - Method of drain trench treatment - Google Patents

Description

The present invention relates to the backfill of drainage trenches with soil from its own excavation, in which ea solves the problem of treating and etabilizing most of the physical properties of the soil in order to increase the drainage efficiency in draining heavy, low permeability pdd.

Most heavy, low-permeability stages often require a specific yet very costly way of modifying the water and air modes. The choice of a suitable method for draining heavy wet conditions depends on the conditions and causes of waterlogging. The most widespread way of draining heavy podiums is the flat tubular sink.

The theory and practice of surface drainage has been derived and verified on a good permeability (sandy and loamy falls).

The key basis for the elaboration of the criteria for deriving the necessary relationships in the soil - water system, on the basis of which the drainage of the soil is solved is the grain composition of the soil divorced by Kopecký in our country.

For solving the relations affecting the movement of water on heavy stages, criteria based only on the grain size of the soil are not sufficient. Recently, they have been complemented by other indicators that assess not only the content but also the quality of the mineral content of the pod, the clay, the physical and chemical properties of the fall.

The relationships in the p & da-water system and their dynamics in difficult stages are too complex, and even the most complicated equations derived here do not determine the dimensions of these relationships,

200 118 would speed up and put forward in practice.

It is recommended to use drainage filters, obeypy and backfills to increase drainage efficiency in light, poorly adhering soils. Their task is to prevent clogging of the drainage pipe or to increase its hydrological efficiency.

The use of drainage filters, backfills and backfills is determined by the Rdirections of the RSCR and CSR 1973 of 1973.

The simplest measure to achieve increased drainage efficiency on light, low-permeability odors is to perform drainage works in the dry season, precisely encapsulate the drainage pipes with loose permeable soil, usually from the topsoil layer, and include the trench by dry excavation.

In the case of light, all-permeable pSds having a high proportion of clay minerals with expandable lattice (montmorillonite), mixed structures illit montmorillonite / in working fractions with unstable backfill structure and sedimentary soil, their volume decreases rapidly, increasing in volume, , quit quickly, and is performing its function.

Due to the alternating process of wetting and drying, the soil particles are oriented in an upward position, which ultimately results in self-pressing of these pSd. This not only reduces the total pore volume but also fundamentally changes the geometry of the comparator prieator (size, shape and arrangement of the comparisons), which has a significant effect on the reduction of the permeability of the buried earth. This slows down the drainage of water drains.

In such cases, it is recommended to treat the soil, which is used for filling the gates, as • obeypy from Special materials with flood excavation in the ratio of 1: 2 to 1: 3. It was also possible to use chopped waste from organic matter waste ^from straw, corn, etc. / with the admixture of the original excavation at a ratio of 1 | 2 and 1: 3.

The embankments and obeypy of the drainage drainage at the cross drainage have ensured a perfect interconnection of the moles and pipe drains and contributed to the drainage of excess water from the pod. Therefore, it is recommended that the conductors be provided with a backfill of highly permeable porous material up to a height of 10 µm above the level of the layer with reduced permeability. ^Also , the excavation in the case of light clay clays is not suitable for building a full backfill of drainage grooves. Therefore, it is recommended to use a mixture of flood excavation with special material in varying proportions according to the properties of the material used.

For extreme soil conditions, when the content category I Kopecky is higher than 85%, while fyzikílneho content of clay is greater than 50% are recommended special measures epočívajú in backfilling the whole drainage trench to level 3 ^υ to 40 cm below ground level ípeciálnym material.

The use of the powder material Špeoiálnych drainage grooves increases the cost of the dewatering ^υ 3 to 50%, a 3500-7000 CSK ha 1 ha dewatering area.

It has now been found that an aqueous colloidal dispersion of vinyl acetate copolymers with acrylic esters can be used for this purpose. Up to now, Ί'saβΐο are commonly used for the production of paints and varnishes, various diaperic adhesives and for impregnating textiles.

200 110

Technical and economic problems with the use of spills of special materials for plugging of drainage trenches on heavy, poorly permeable stages are solved according to the invention by drainage trenches with soil treated by repeated spraying with a colloidal dispersion of vinyl acetate copolymer and acrylic acid esters.

The drainage trench covered with soil treated in this way has improved properties, stabilized structure, retains its loosened state, is porous, well permeable to water and air.

After treatment, Nemina fundamentally changes its properties. Film coatings of the proposed emulsion are formed around the soil particles and aggregates, resulting in the formation of solid bonds between the soil particles and the aggregates. They eliminate the high free surface energy of the clay soil particles and thus reduce the undesirable processes in the stages resulting from the nature of these stages. They bio-swell swelling and shrinking, reduce soil volume changes by 3% to 45%, reduce swelling pressure by 30 to 35% compared to control. The permeability of the treated soil in the drainage groove is up to 20 times greater than the permeability of the surrounding soil. The effect is long-lasting. No harmful residues remain in the ground.

The soil from the original trench drainage trench and after spreading on the soil surface will allow to dry. ^The soil moisture content corresponds to an approximate pF 3 value (reduced availability point) is sprayed with the prepared emulsion of vinyl acetate copolymer with acrylic esters diluted in water at a rate of 0.02 to 0.05% by weight relative to the dry soil. After a partial swelling, the soil is mixed with the cultivator or harrow and sprayed again with the prepared emulsion in a similar dose. The nemina is allowed to dry freely and is thus ready to plug the drainage groove. Sprayers can be used for spraying, which are commonly used for anti-chemical protection of crops.

The invention can be used in ameliorative practice in the drainage of heavy, low permeability. Come. The hydrological efficiency of the backfill of the drainage trench with the soil treated according to the invention is comparable to the efficiency of the backfills made of special materials, while reducing costs. In addition, the invention addresses the question of replacing scarce special materials with original soil from the excavation itself. Transportation costs are reduced, fuel is saved, drainage interventions are reduced.

Claims (1)

PREDMETVYNÁLEZU Process for treating drainage trenches, characterized in that the soil above the drainage tube is sprayed with an aqueous colloidal dispersion of a vinyl acetate copolymer with acrylic esters.