general information

Dornit is a special non-woven, air- and water-permeable geotextile that is commonly in contact with water, soil, and materials used in modern construction. It should be noted that due to its high technical performance, dornit is especially popular.

The main production method is thermal

Modern thermally bonded geotextiles are made from continuous fibers by special bonding them with the help of temperature. Thermally bonded is also commonly referred to as needle-punched geotextile, to which a special fusible fiber is additionally added. The resulting web is then subjected to heat treatment, and as a result of this, the fibers are quite rigidly fastened together, while the overall tensile strength of the material increases.

That is why modern thermally bonded canvas is actively used where it is necessary to withstand serious loads, for example: with special reinforcement of slopes, when performing various foundation works and strengthening existing coastal slopes. Modern heat-strengthened geotextiles are usually thinner when compared to various non-heat-strengthened and non-woven geotextiles for the same basis weight of the building materials used.

That is why for many tasks it is best to use dornite. Using competently modern geotextiles, you can always be sure of high quality. In addition, it has lower filtration properties, but they have a relatively large initial modulus, like different woven materials, and a significant elongation at break, like different needle-punched materials.

Mounting

Dornit is laid in a transverse or longitudinal direction relative to the common axis of the embankment. At the same time, longitudinal laying is the most convenient in terms of technology, but it does not provide the proper equal strength of the sheets over the entire width of the embankment, and this, in turn, is mandatory when arranging various modern reinforcing layers for weak foundations.

When installing canvases to create special protective layers along the entire canvas of the earth, all rolls are rolled out completely manually, usually by a team of three trained workers. Already after rolling out several meters, the initial edge part (namely in width) of the canvas is specially pressed to the ground with the usual two or three anchors. At the same time, the anchor rods themselves (with a bent upper and somewhat pointed lower ends) should have a diameter of 0.3 to 0.5 cm, and a total length of 15 … 20 cm.

Subsequent rolling of the canvas is carried out with periodic leveling of the entire surface and with a slight tension in the longitudinal plane and securing it to the ground with special anchors (or in another similar way) every ten to fifteen meters (usually every one and a half to two meters when arranging a special layer of geotextile for weak base).

Such fastening is done in order to avoid significant displacement of the web when exposed to wind loads, laying the next layer, and also to generally maintain a slight pre-tension of modern geotextiles.

All canvases are laid with some overlap (at least 30 cm) and, if necessary, they are connected. When arranging a layer of modern geotextile at the base of any embankment, which is composed of weak soils, the total amount of overlap is usually slightly increased by a distance of at least 50 cm.

When installing canvases — to create reliable protective and reinforcing layers (usually in the transverse direction), the total overlap in the absence of a common connection should be at least 50 cm.

All canvases are specially attached to the ground with special anchors, which are installed at the width of the ceiling, usually every one and a half to two meters.

Such a special connection of the canvases will significantly reduce the amount of their overlap. The most preferred type of modern joining of fabrics is their special stitching using bag sewing machines.