Geogrid or mesh structure for soil surface reinforcing

FIELD: fixed constructions; reinforcing of the soil surface of road slopes and shore lines, protection of mainline pipelines against soil erosion using geogrids.

SUBSTANCE: geogrid comprises set of flexible tapes made of a woofed structure material that are set on edge and attached one to another with seams to form a meshed structure when the grid in set position. The tapes are made of a material having a woofed structure formed of 150 to 300 polypropylene threads in warp direction and of polypropylene fibrillated or multifilament threads in weft direction, and having a breaking force not less than 100 kN/m. The used seams are shuttle-type seams with bar tacks. The length of the geogrid in its set position is from 10 to 20 m, the width is up to 10 m, and the height - from 50 to 150 mm. The geogrid mesh sides are from 50 to 500 mm in its set position in longwise and crosswise directions. The thickness of flexible woofed tape is from 1.0 to 2.0 mm. The seams are stitched vertically in relation to the flexible edges with twisted sewing threads, made of polyether or polyamide or other synthetic threads with a breaking load not less than 60 N, ensuring a minimal breaking load of the seam not less than 50% of the tape breaking load of the tapes.

EFFECT: enhancement of the geogrid performance characteristics; ultraviolet rays resistance of the material; biological stability; environmental security; maintaining stable characteristics to allow using the geogrid at all times and at all temperatures.

4 cl, 4 dwg, 1 tbl

 

The invention relates to the construction, namely the strengthening of the soil surface slopes of roads and Railways, coastlines, protection of pipelines from soil erosion, to increase the carrying capacity of the roadway, etc.

Known geogrid with cellular structure to strengthen the soil surface, made of flexible strips that are installed on the edges and interconnected in a staggered seams with education in an extended, working position of the honeycomb structure (see U.S. patent No. 4797026, CL E02D 17/20, 1989).

Known geogrid with cellular structure made of flexible strips connected by joints so that when stretched, they form three-dimensional structures (see RF patent №2166625, E02D 17/20, EV 3/12, E01C 5/00 from 27.04.2001,).

The closest to the essence and the achieved result to the invention, the technical solution is the geogrid with cellular structure, made from a variety of flexible strips of textile material structure, set on edge and interconnected by joints with education in the working position of the honeycomb structure (see RF patent №2180030, E02D 17/20 from 10.09.1999 year).

However, the known technical solutions have the following disadvantages: low strength of the lattice due to the low cutoff characteristics of flexible strips, when laying Tr which require more effort because of the rigid connection of the strips, what temperatures can cause damage, lack of permeability, which contributes to the leaching of soil from cells, a significant proportion of the transport volume to the desktop.

Task to be solved by the present invention is directed, is the performance of the geogrid by increasing the cutoff characteristics of the flexible strips, the most loaded element - seam resistance of the material to ultraviolet radiation, biological durability, environmental, safety, long-term work with stable performance with geogrid at any time of the year at various temperatures, and ensure good filtration capacity. Put the problem is solved due to the fact that the geogrid with cellular structure, made of a set of flexible bands with textile material structure, set on edge and interconnected by joints with education in the working position of the honeycomb structure, the flexible strip is made of a material with a woven structure formed from 150 to 300 polypropylene yarns in the warp and polypropylene fibrillated or multi-filament threads on a duck, and have a tensile strength of not less than 100 kN/m, and the seams are arranged vertically with respect to the edges of the flexible strips and the Shuttle made with implementing the Oh of woven synthetic sewing yarn with a breaking load of not less than 60 N, providing a minimum breaking load of the weld is not less than 50% of the breaking load of the flexible strips.

In addition, the length of the geogrid in the working position can be from 10 to 20 m, width 10 m and a height of from 50 to 150 mm; the cell size of the geogrid in the working position can be in the longitudinal and transverse directions from 50 to 500 mm; the thickness of the flexible woven stripes can vary from 1.0 to 2.0 mm

Polypropylene in its structure an inert material, under normal operating temperatures from -50 to +50° does not interact with any chemical or biological material that ensures environmental safety of the geogrid.

Flexible strip of woven material for geogrids are manufactured at the ribbon-weaving machines by filling the basis of from 150 to 300 filaments, such as polypropylene, and in the duck is applied fibrillated polypropylene or multifilament thread size up to 1500 denier. Edge of the flexible strip strengthened by powazki filling and banding thread that even when the local violation of the integrity of the territory, does not bloom threads flexible strip further.

Made flexible strip is a woven material of white or any other color, width from 50 to 150 mm, a thickness of 1 to 2 mm, It provides a flexible strip of material with a woven structure gap is th load of not less than 100 kN/m Data cutoff characteristics of the geogrid are achieved due to the fact that when filling the basis of the woven material of the flexible strip large a certain number of threads (from 150 to 300) on a relatively small width of the flexible strip (from 50 to 150 mm), the effect of the rope and it also provides sufficient transverse stiffness (modulus of elasticity) of the flexible strip. Data cutoff characteristics of the geogrid is essential in use on the slopes above 30° and a height of 5 m, as the weight of bulk soil or other material is poured into the cells of the geogrid, especially after saturation moisture on the contact bulk soil and the Foundation should be provided with the balance shifting and holding force.

According to the calculations MSCU for embankment height 5 m required tensile strength of the geogrid as reinforcement material, tensile must be 77 kN/m in a single-layer reinforcement. The time of consolidation of the soil is 1.5 years, i.e. reinforcing geogrid within the specified period must have a constant strength of not less than 77 kN/m (see Shcherbina E.V. Geosynthetic materials in construction. DIA, M., 2004, p.54).

Conducted experiments have shown that, compared with known geogrids, only the proposed geogrid due to the woven structure of the flexible strips with certain kolichestvennie satisfies these requirements, providing a breaking load of 100 kN/m

Having woven material structure made of polypropylene yarn, flexible strip of geogrid freely passes the water permeability of not less than 70 m3/day and does not prevent the penetration of the root system of turf. Polypropylene filaments woven fabric flexible strip proposed geogrid due to the vitreous surface is not affected kalatali, unlike threads flexible strip of non-woven materials that are fibrous in structure.

The connection of the flexible strips to obtain the geogrid is made with seams located vertically with respect to the edges of the flexible strips, special sewing machines with reversing course twisted sewing thread made of polyester or polyamide or other synthetic yarn with a breaking load of not less than 60 N, which provides the minimum breaking load of the weld is not less than 50% of the breaking load of the flexible strips. Unlike flexible strips of geogrid of the finished nonwoven material, woven material strip when sewing needle of the sewing machine extends thread and, as the threads are not interconnected rigidly, weakening the strip in place of protiva does not occur. In the case of stapling flexible strips of nonwoven needle cuts through the strip material, which leads to knowledge is sustained fashion to reduce the disruptive characteristics of the bands in place of protiva. The invention is illustrated by drawings, where:

figure 1 - the geogrid in the folded state,

figure 2 - geogrid working in the extended position,

figure 3 - cell of the geogrid with the notation of dimensions,

figure 4 - view 1 figure 3 (scheme weld at the junction of the flexible strips and threads of a woven structure of the material strips of geogrid).

Geogrid 1 consists of a set of interconnected cross stitch lockstitch seam with tack 2, flexible strips 3 of a material with a woven structure formed by the threads 4 bases and 5 threads duck and having longitudinal ribs 6. Cell 7 of the geogrid in the stretched condition figure 3 have the shape of a hexagon with the size of F in the transverse and longitudinal direction 50 of 500 mm and a length (L) of the area between the seams of up to 200 mm

The geogrid in the stretched condition in figure 2 has the following dimensions:

A - length of the geogrid from 10 to 20 m;

In - the width of the geogrid to 10 m;

H - the height of the geogrid from 0.05 to 0.15 m

The geogrid in the stretched state (with dimensions: length 10 m and a width of 8.7 m) has an area of 87 m2and weight up to 35 kg

In the folded position geogrid is a module of rectangular form, convenient for transportation.

The ratio of the volume of the transport position of the geogrid in the form of a module to the extended (working) position 1:130, which is very beneficial if transportirovki the geogrids to the point of use.

Characteristics of the proposed geogrid compared with similar production characteristics of geogrids, obtained as a result of the tests shown in the table.

Table
Characteristics of the geogridThe polymer geogrid stripsGeogrid with woven stripesGeogrid woven strips of polypropylene filaments
The breaking load of bands, kN/m4020100
Chemical and biological stability, the yearunlimited2unlimited
Filtration capacity, m3/d04070
The area of the module, m214,88387
Flexibility on the beam with a radius of 5 mm at t minus 40°does not standviolation of patterns of material noneviolation of patterns of material none
The ratio of the volume of the unit in the folded and extended status1/541/551/130

The tests proposed geogrid showed pickup is usesto its characteristics over known that you can use as a reliable reinforcing means for reinforcing slopes, road bases, surface protection of slopes over the pipeline systems, plugging lakoocha mining industry and other geotechnical features.

The geogrid has a low intensity, strength tapes 100 kN per 1 m and the strength of joints not less than 50 kN/m, and provides reliable protection of soil from erosion and filtering of water down the slope.

The proposed geogrid allows to increase the carrying capacity of the roadway if it be laid in the base of the road or asphalt coating due to the redistribution of loads from the vehicle evenly across the base of the road.

High stability of the fill geogrid soil to the action of wind and water erosion due to the implementation of flexible strips woven structure of the material obtained from polypropylene filaments. Which also contributes to the natural sprouting roots grass for additional securing of the soil in the cell of the geogrid.

1. Geogrid with cellular structure to strengthen the soil surface, containing a variety of flexible strips of textile material structure, set on edge and interconnected by joints with the formation of working in the position of the honeycomb structure, characterized in that the flexible strip is made of a material with a woven structure formed from 150 to 300 polypropylene yarns in the warp and polypropylene fibrillated or multi-filament threads on a duck, and have a tensile strength of not less than 100 kN/m, and the seams are arranged vertically with respect to the edges of the flexible strips and made the Shuttle with the tack of woven garment synthetic yarn with a breaking load of not less than 60 N, providing a minimum breaking load of the weld is not less than 50% of the breaking load of the flexible strips.

2. The geogrid to claim 1, characterized in that the length of the geogrid in the working position is from 10 to 20 m, width 10 m and a height of from 50 to 150 mm

3. The geogrid according to claim 1, characterized in that the cell size of the geogrid in the working position are in longitudinal and transverse directions from 50 to 500 mm

4. The geogrid according to claim 1, characterized in that the thickness of the flexible strip is from 1 to 2 mm.



 

Same patents:

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3 cl, 1 tbl, 7 ex

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1 cl, 1 tbl, 3 ex

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1 cl, 1 tbl, 3 ex

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1 cl, 1 tbl, 1 ex

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EFFECT: enhanced efficiency and reliability.

8 cl, 7 dwg, 1 ex

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