EA017356B1 - The geolattice focused in one direction and a building element on its basis - Google Patents

Abstract

The invention relates to area of construction and concerns basically the devices strengthening road clothes, especially on the weak grounds. It can be applied also as a special reinforcing or protecting element in other various building designs. The task of the invention consists in increase of durability of the geolattice focused in one direction and reliability of a building element on its basis. The building element contains a basic element, for example, a layer of rubble on which the geolattice is laid. The geolattice (fig. 2) contains parallel lines of strips (2) of replacement and orientation in one direction of a material on the basis of polyolefine, for example polyethylene or a mixture of polyolefines. The strips form parallel lines of oval windows (3) and parallel lines of edges (4) which are perpendicular to the lines of strips. The edges contain in places of the crossing with strips thickenings (5) between which additional thickenings (6) that are greater in section are located. Variant of performance of a ratio of thickness in a design of such lattice can be performance of thickenings (5) with greater thickness of strips (2) no more than in 2.2 times, and additional thickenings (6) - no more than in 2.5 times. For increase of coupling qualities of the lattice it is recommended to put a superficial grid (7) at least on one of its sides. For increase of elasticity and durability of the lattice it is reasonable to carry out the strips with thickness on the edges (8) more than in their average part (9), for example, in 1.5 times. For maintenance of the best opportunity of deduction of a loose or lumpy material on each line of strips, it is desirable in places of transition (10) of the strips to make biases in thickenings (5).

Description

The invention relates to the field of construction and relates mainly to devices that strengthen the pavement, especially on soft soils. It can also be used as a special reinforcing or enclosing element in various other building structures.

Known geogrid (grid) uniaxially oriented [1]. It includes, with the possibility of twisting into a roll, mutually perpendicular and made of extruded and oriented in one direction material based on polyolefin (polyethylene) parallel rows of continuous strands and parallel rows of thicker than strand ribs with the formation of oval windows.

The implementation of such a grid of solid ribs, thicker than the strands, increases the total mass of the geogrid (grid), which causes an increased consumption of material in its manufacture.

In addition, the implementation of continuous geogrid ribs (grids) reduces its coupling qualities inside building structures. Therefore, it has limited use, for example, on weakly bearing soils.

Known lighter and more versatile in its application geogrid (grid) uniaxially oriented [2], which is taken as a prototype of the invention. It includes, with the possibility of twisting into a roll, parallel rows of strands from extruded and oriented in one direction polyethylene material with the formation of oval windows and parallel rows of ribs perpendicular to the strands containing thickened nodes at the points of intersection with the strands that are necessary to strengthen the design of the geogrid (mesh ) and for the formation of a gap between its strands and the supporting surface, for example, the surface of the soil on which such a geogrid (grid) is laid, as well as to increase clutch mesh with building construction elements.

However, the disadvantage of the known device is the presence in the geogrid (grid) of thin sections of ribs, which, with significant fluctuations in operating loads and temperature conditions in the building structure, can cause a rupture of such thin sections and a decrease in the reinforcing properties of the geogrid (grid).

A known building element [1], consisting of a support sheet and a geogrid (grid) laid on it, containing parallel rows of solid strands and parallel rows of thicker than mutually perpendicular and made of extruded and oriented in one direction material based on polyolefin (polyethylene) strands, ribs with the formation of oval windows.

The disadvantage of such a building element is its limited use. For example, it cannot be used on weakly bearing soils, since the implementation of continuous geogrid ribs (grids) reduces its coupling qualities inside building structures.

The building element [2], adopted as a prototype of the invention, is more universal in its application, consisting of a supporting sheet and a geogrid (grid) laid on it, containing parallel rows of strands from extruded and oriented in one direction polyethylene material with the formation of oval windows and parallel rows perpendicular to the strands ribs containing in the places of their intersection with the strands thickened nodes that are necessary to strengthen the design of the geogrid (mesh) and to form a gap between its walls gami and supporting surface, for example the surface of the soil on which such a geogrid (grid) is laid, as well as to increase the adhesion of the grid to the elements of the building structure.

However, the reliability of such a building element is insufficient due to the presence of thin sections of ribs in its geogrid (grid), which, with significant fluctuations in operating loads and temperature conditions in a building structure, can cause rupture of such thin sections and a decrease in the reinforcing properties of the geogrid (grid), which will lead to reduce the effectiveness of the building element in a building structure.

The objective of the invention is to increase the strength of the geogrid (grid) uniaxially oriented and the reliability of the building element based on it.

The problem is solved in that the geogrid (grid) is uniaxially oriented, containing, with the possibility of twisting into a roll, parallel rows of strands of extruded and oriented in one direction material based on a polyolefin or a mixture of polyolefins with the formation of oval windows and parallel rows of edges perpendicular to the strands containing at their intersections with the thickening strands, it has distinctive signs: the ribs opposite the oval windows contain additional thickenings larger in section than thickened I am at the intersection of the ribs with the strands.

Such an introduction of the distinguishing feature will allow to maintain alternation, as in the prototype [2], of different sections of the ribs in height, which is aimed at ensuring good adhesion of the geogrid (grid) with the elements of the building structure. But unlike the prototype [2], this alternation does not occur with thinning, but rather with thickening of the ribs between the places of their intersection with the strands. Therefore, the strength of the geogrid (grid) according to the utility model is significantly increased.

An option to fulfill the ratio of thicknesses in the design of such a geogrid (grid) in order to reduce the consumption of material can be to perform thickenings more in thickness of the strands no more than 2.2 times, and additional thickenings - no more than 2.5 times.

- 1 017356

To improve the adhesion properties of the geogrid (mesh), it is recommended that at least one of its sides be corrugated.

To increase the elastic and strength characteristics of the geogrid (grid), it is advisable to run them at the edges of the strands in thickness more than in their middle part, for example, 1.5 times.

To improve the elasticity of the geogrid (mesh), it is also recommended to place strands with at least one radius of curvature relative to the supporting surface of the ribs.

To provide better retention of bulk or lumpy material on each row of strands, it is advisable to make slopes at the places where the strands go into thickenings.

Recommended sizes of oval windows of the geogrid (grid): length 235 mm, width 16 mm.

Recommended sizes of geogrid (mesh) twisted into a roll: length not more than 50 m, width not more than 1.2 m.

The object of the invention is also solved by the fact that the building element, consisting of a supporting sheet and a geogrid (grid) laid on it, containing parallel rows of strands from an extruded and oriented in one direction material based on a polyolefin or a mixture of polyolefins with the formation of oval windows and Perpendicular to the strands of parallel rows of ribs containing at the points of intersection with the strands of thickening, has distinctive signs: the edges of the lattice (mesh) opposite its oval windows contain Chiyah in section additional thickening than thickening at the intersections of the ribs with the strands.

The essence of the utility model is illustrated by illustrations, where in FIG. 1 shows a uniaxially oriented grid twisted into rolls;

in FIG. 2 is a general view of a part of a straightened geogrid (grid) uniaxially oriented;

in FIG. 3 - an enlarged fragment of a top view of a straightened geogrid (grid);

in FIG. 4 is a side view of a fragment thereof;

in FIG. 5 is a section AA in FIG. 2;

in FIG. 6 is a section BB of FIG. 2;

in FIG. 7 - a building construction using a building element based on such a geogrid (grid);

in FIG. 8 is a fragment of the location of the building element inside the building in the intermediate stage of laying.

A uniaxially oriented geogrid (mesh) is pre-twisted into rolls 1 of FIG. 1. Recommended sizes of geogrid (mesh) twisted into a roll: length not more than 50 m, width not more than 1.2 m. When straightened, it contains parallel rows of strands 2 from extruded and oriented in one direction material based on a polyolefin, for example, polyethylene or a mixture polyolefins. Strands 2 form parallel rows of oval windows 3 and parallel rows of ribs 4, which are perpendicular to the rows of strands 2. Recommended sizes of oval windows 3 geogrids (mesh): length 235 mm, width 16 mm.

The ribs 4 contain at their intersection with the strands 2 thickenings 5, between which are located larger in section additional thickenings 6.

An embodiment of the ratio of thicknesses in the design of such a geogrid (grid) can be the implementation of thickenings 5 greater in thickness of strands 2 no more than 2.2 times, and additional thickenings 6 - no more than 2.5 times.

To improve the coupling properties of the geogrid (grid), it is recommended that at least one of its sides be coated with corrugation 7 (three places of such corrugations are conventionally shown in Fig. 2).

To increase the elastic and strength characteristics of the geogrid (grid), it is advisable to run them from the edges of 8 strands 2 in thickness more than in their middle part 9, for example, by 1.5 times.

To improve the elasticity of the geogrid (mesh), it is recommended to increase the gap Δ between the strands 2 and the supporting surface of the ribs 3 due to at least one radius r (Fig. 4) of their curvature.

To provide better retention of bulk or lumpy material on each row of strands 2, it is desirable to make slopes at the points of transition of 10 strands in bulges 5.

The maximum tensile load of the geogrid (grid) in the longitudinal direction is 25-110 kN / m, depending on its thickness.

A geogrid (grid) 2 rolled out of rolls 1 is used to create a building element located in a building structure, for example, on the slopes of a highway (Fig. 5). Moreover, the wrapping method is used to increase the stability of the building element, which in this case consists of a support element in the form of a layer of fractional crushed stone 11 and geogrids (grids) 2. In this case, the arrangement in parallel rows of layers of fractional crushed stone 11 with geogrids (grids) 2 along the slopes of the soil 12 embankments of the road, which has an asphalt concrete pavement 13. To improve and further strengthen the slopes of the embankment, a fertile layer 14 is laid on them.

During the operation of building elements, they experience significant loads transmitted to the slopes of the embankment. However, due to the fact that the described method of wrapping them with

- 2 017356 by changing the geo-grid (grid) of uniaxially oriented, made according to a utility model, it is possible to apply this method on weak-bearing soils, for example, on wetlands.

The use of such building elements with the described construction of uniaxially oriented geogrids (grids) makes it possible to create slopes with an angle of up to 90 ° inclusive and is an alternative to the construction of retaining walls.

Information sources

1. Application KK 100257227, IPC Ε02Ό 17/18, published 2000.05.15.

2. Patent I8 5267816, IPC ВСС 55/04, Β29Ό 28/00, Ε20Ό 17/20, published 1993.12.07 (prototype).

Claims (10)

CLAIM 1. A uniaxially oriented geogrid having twisting into a roll (1), containing parallel rows of strands (2) of a material based on a polyolefin or a mixture of polyolefins extruded and oriented in one direction and containing parallel rows of edges (4) connected with strands (2) with the formation of oval windows (3), while at the intersection of the ribs (4) with the strands (2) there are thickenings (5), characterized in that the ribs (4) have additional thickenings (6), which in cross section more than thickening (5) at the intersection of the ribs (4) with the strands (2). 2. Geogrid according to claim 1, characterized in that the thickenings (5) are more than one, but not more than 2.2 strand thickness (2), and the additional thickenings (5) are more than one, but not more than 2.5 strand thickness (2). 3. Geogrid according to claim 1, characterized in that at least one of its sides has corrugation (7). 4. Geogrid according to claim 1, characterized in that the thickness of the edges (8) of the strands (2) exceeds the thickness in their middle part (9). 5. The geogrid according to claim 4, characterized in that the thickness of the edges of the strands (2) is 1.5 times the thickness of their middle part (9). 6. Geogrid according to claim 1, characterized in that in places of transition (10) strands (2) in the thickenings (5), slopes are made. 7. Geogrid according to claim 1, characterized in that the strands (2) are located along a line with at least one radius of curvature relative to the supporting surface of the ribs (4). 8. Geogrid according to claim 1, characterized in that the oval window has a length of 235 mm and a width of 22 mm. 9. Geogrid according to claim 1, characterized in that it has the ability to twist into a roll with a length of not more than 50 m and a width of not more than 1.2 m. 10. A building element, characterized in that it consists of a support web and a uniaxially oriented geogrid according to claim 1.