RU198911U1 - Reinforced geogrid with holes - Google Patents

Abstract

The technical solution relates to the polymer industry, namely, geogrids (geogrids) made of polymer materials and designed to strengthen slopes and foundations. The technical result is to improve reliability. The geogrid includes strips of polymeric material that protrude above the surfaces of the strips, the geonets are rectilinear, forming a surface mesh, and intersecting with each other at the nodes of the surface mesh, corrugation elements that are made on the side surfaces of each strip, and adjacent strips are connected by transverse welds to form geogrid cells, while in the walls of the geogrid cells, rows of upper holes and rows of lower rounded holes are offset relative to each other, between which there is a longitudinal section on which the geogrid is made continuous, and the surface mesh formed on the surfaces of the strips by corrugation elements has diamond-shaped cells , and in each diamond-shaped cell there is an additional longitudinal diagonal rib. 6 c.p. f-ly, 7 ill.

Description

The technical solution relates to the polymer industry, namely, geogrids (geogrids) made of polymer materials and designed to strengthen slopes and foundations.

A plurality of geogrids with similar geometrical configurations are known from the prior art, having cells formed from strips with perforated walls connected by transverse seams RU 2221110 C2. RU 2474637 C2. RU 2625058 C1, 11.07.2017; RU 120110 U1. 09/10/2012; EA 201691622 A1. 2017.01.30; EA 015761 B1, BY 3635 U, 2007.06.30; CN 203668954 U, 25.06.2014-06-25; CN 106574452 A, 19.04.2017; WO 2017078551 A1, 11.05.2017: US 2006147276 A1. 06.07.2006.

A close analogue to the claimed technical solution is a geogrid made of flexible sheet material, in which cuts are made having a central part in the form of a straight line segment and two end parts in the form of an arc, while the central parts of the cuts are arranged in rows with displacement of the cut lines of adjacent rows along directions of the cuts. (RU 2601642 C1, 10.11.2016).

The closest analogue to the claimed technical solution is a cellular structure containing a plurality of elongated plastic strips located next to each other, which are connected to each other at alternating connecting sections located at the same distance from each other, and each pair of strips is connected by welded seams at connecting plots; one strip in each pair is welded to a strip of an adjacent pair in the places located between the welds of this pair of strips and forming unpaired connecting sections, and the strips can be stretched in width to form a single lattice of cells, while the strips form the walls of the cells, each wall of the cell has an open area due to a plurality of holes, each of the holes has a diameter of about 3 to 17 mm, and the plurality of holes are arranged in a configuration having a horizontal distance D3 between holes closest to and on opposite sides of the unpaired connection portion; horizontal distance D4 between the centers of individual holes; vertical distance D5 between the centers of the individual holes; vertical distance D6 between holes located in the middle of the cell wall; the horizontal distance D9 from the vertical edge of the cell wall to the unpaired connecting section, and the total area of holes in one wall of the cell in this configuration is approximately 19 to 28% of the total area of the cell wall (RU 2196864 C2, 30.10.1996). The disadvantage of the analogue is that its tapes have too large a perforation area in the form of small holes located close to each other, and do not have corrugations, which can lead to rupture of individual sections of the cellular structure.

The closest analogue to the claimed technical solution is a geogrid in which flexible strips are made of a polyolefin or a mixture of polyolefins, for example, from low pressure polyethylene or from a composition of low and high pressure polyethylene. The flexible strips are structured in the form of diagonal mesh rhombuses. The flexible strips are joined together by means of several rows of ultrasonic spot welds. In order to strengthen the places of fastening of flexible strips, point seams can be made in the form of either rectangles or in the form of circles. To increase the adhesion properties of the surface of flexible belts, at least two opposite corners of the diagonal mesh rhombuses are interconnected by an additional corrugation element. It is also desirable to make through holes in flexible strips (see Fig. 7) for better ventilation of the building structure and increase of its drainage properties. (RU 98763 U1. 27.10.2010).

The disadvantage of the analogue technical solution is its insufficient strength.

The technical challenge is to improve the reliability of the geogrid.

The technical result consists in increasing the reliability of the geogrid.

The technical result is achieved due to the fact that the geogrid includes strips of polymer material that protrude above the surfaces of the strips, rectilinear geonets that form a surface mesh and intersect each other at the nodes of the surface mesh, corrugation elements that are made on smooth side surfaces of each strip, moreover, adjacent strips are connected by transverse welded seams, with the formation of geogrid cells, while in the walls of the geogrid cells, rows of upper holes and rows of lower rounded holes are offset relative to each other, between which there is a longitudinal section on which the geogrid is made continuous, and the surface mesh formed on the strip surfaces by corrugation elements has diamond-shaped cells, and in each diamond-shaped cell there is an additional longitudinal diagonal rib.

It is preferable that the width of the longitudinal section is greater than the distance between the centers of the outermost openings of the upper or lower row.

Preferably, the diameter of each hole is less than the distance between the centers of the holes of adjacent rows.

It is preferable that the distance from the edge of the cell wall is greater than the diameter of the hole.

Preferably, the ends of the diagonal ribs are connected to the nodes of the diamond-shaped cells.

It is preferable that to strengthen each transverse weld on one of the welded strips, rows of blind anchor recesses are made on its outer side, and on the other strip, on its outer side, in the region of the rows of recesses, there is additional flattened reinforcement.

Preferably, the additional flattened reinforcement is a compressed-deformed seal formed by diamond-shaped cells, their nodes and diagonal ribs, which are deformed and partially fused with each other, and melted to the surface of the connected mesh strip.

The technical solution is illustrated by drawings.

FIG. 1 shows a geogrid decomposed from a flat transport state (isometric view).

FIG. 2 shows an enlarged fragment of the surface of a geogrid strip (cell walls) with corrugation elements protruding above the surfaces of the geogrid strips.

FIG. 3 shows a fragment of the first connected geogrid strip, on the outer side of which a flattened reinforcement (rolling) is made in the area of the transverse seam.

FIG. 4 shows a fragment of the second (adjacent) strip of the geonet connected to the first transverse seam from the outside with which the anchor recesses are made.

FIG. 5 shows a fragment of the wall of a geogrid cell (isometric view).

FIG. 6 shows a fragment of a geogrid, in the region of the transverse seam of the cell of which a flattened reinforcement is made (isometric view).

FIG. 7 shows a fragment of a geogrid in the area of the transverse seam of the cell of which anchor recesses are made.

Reinforced geogrid (hereinafter referred to as geogrid) includes strips 1 made of polymeric material, having rectilinear geogrid protruding above the surfaces of the strips, forming a surface mesh, and corrugation elements 3 intersecting at its nodes 2 (Fig. 3). The stripes are long flexible belts.

The elements of the corrugation 3 are made on the side smooth surfaces of each strip. The elements of the corrugation 3, in fact, are reinforcing elements (stiffeners) preventing deformation of the strips 1 in the weakened and / or most stressed areas. In addition, the elements of the corrugation 3 provide adhesion to the ground or other loose or lumpy material, which is filled with the geogrid. The elements of the corrugation 3 are preferably made over the entire area of the strip on both sides.

Adjacent strips 1 are connected by transverse welds 4 (meaning welding of polymers), with the formation of geogrid cells 5 (Fig. 1-3).

In the walls 6 of the geogrid cells 5 (located between the seams), rows 7 and 8 of circular holes 9, 10 are offset relative to each other. From the point of view of strength characteristics, the most preferable is the completely circular shape of the holes.

The walls 6 of the cells 5 of the geogrid are made of rows 7 of upper holes 9 and rows 8 of lower holes 10, between which there is a longitudinal section 11 without holes, on which the tape is made continuous (without holes).

Each strip has the following, interconnected, advantageous geometric parameters (Fig. 3).

The width (height) H of each strip of the geogrid, and, accordingly, the wall 6 of the cell 5 of the geogrid is 8-10 cm.

The width h of the longitudinal section 11 (without holes) is at least 1/4 (0.25) of the width H of the strip and, preferably, greater than the distance B between the centers of the outermost holes of the upper or lower row.

The distance b between the centers of the holes in adjacent rows is 1/10 of the width H of the strip and is preferably 0.8-1.0 cm.

The diameter d of each hole 9 or 10 is less than the distance between the centers of the holes of adjacent rows b and is preferably 0.5-0.7 cm.

The value t of the indent from the edge of the wall 6 of the cell 5 is greater than the diameter of the hole 9 or 10 and is 0.8-1.5 cm.

The distance L from the outermost holes of the upper or lower row to the seam is at least 1/2 of the width H of the strip, preferably 4-5 cm.

The offset D of the centers of the holes of adjacent rows relative to each other in the longitudinal direction is not less than one and a half of the diameter d of holes 9 or 10, preferably 1.5-2.5 cm, while the rows are displaced symmetrically.

The surface corrugation forms a mesh structure formed on the strip surfaces by corrugation elements 3 and has diamond-shaped cells, and in each diamond-shaped cell there is an additional longitudinal diagonal rib 12. The ends of the diagonal ribs are connected to nodes 2 of the diamond-shaped cells (Fig. 2).

Each of the strips 1 of the mesh, with a constant pitch along its length, is connected to the adjacent strips by transverse welds 4, each transverse seam 4 being formed by polymer ultrasonic welding of parts of the strips.

In this case, to strengthen each transverse weld 4 on one of the welded strips, rows of blind anchor recesses 13 are made on its outer side, and on the other strip, on its outer side, in the region of the rows of recesses, there is an additional flattened reinforcement 14. Said additional flattened reinforcement 14 is compressed-deformed seal formed by diamond-shaped cells, their nodes and diagonal ribs, which are deformed and partially fused together, and melted to the surface 15 of the connected strip 1 of the mesh (Fig. 2).

The anchoring recesses 13 are tapered, preferably pyramidal or conical. The depth of each recess is less than the sum of the thicknesses of the two tapes to be joined, but not less than the thickness of one tape (the thickness of the tape is taken as the thickness of its base without taking into account the height of the corrugation elements). It is preferable that the depth of each anchor recess exceeds the thickness of a strip of polymeric material, with the end part of each recess located in an adjacent strip, in the region where the seam 4 has a flattened reinforcement, and in each seam 4 there are two rows of anchor recesses 13 for its entire length (width H of each strip).

The device is manufactured as follows. As a preform, webs are taken from a polymer material made from a polyolefin, such as polyethylene or polypropylene, or mixtures thereof. The web is passed through a machine that forms corrugation elements 3 and diagonal ribs 1 on both sides of the web. Next, the canvas is cut into strips. The strips in the area of the seams 1 are held together by ultrasonic welding. Further, in the area of seams 6, a flattened reinforcement (seal) is formed on one side of the seam by heating and pressure (rolling) and at the same time anchor recesses 12 are formed. Moreover, it is preferable that both of the latter operations are performed simultaneously using a special tool or machine with heating to a temperature melting polymer material. Each anchor recess has a wall forming a closed shell obtained by melting the strip in the seam area. The mentioned closed shell is a kind of anchor, passing through one strip and fixing with its end part in the adjacent strip.

After thermostating the transverse seams 4, the resulting device is stacked, placing the strips 1 close to each other. The stacked device can be rolled up. The resulting seams 4 are particularly durable, and the absence of holes in the walls in the middle of the walls of the cells in the longitudinal section 11 between the upper rows 7 and the lower rows of 8 holes increases their tensile strength, which together significantly increases the reliability of the geogrid.

During installation, the strips are stretched in the transverse direction to form cells 5, into which soil, crushed stone or other loose filler is poured.

Claims (7)

1. A geogrid, characterized in that it includes strips of polymer material, having rectilinear geogrid protruding above the surfaces of the strips, forming a surface mesh, and intersecting with each other at the nodes of the surface mesh, corrugation elements that are made on the side surfaces of each strip, with adjacent strips are connected by transverse welded seams, with the formation of geogrid cells, while in the walls of the geogrid cells, rows of upper holes and rows of lower rounded holes are offset relative to each other, between which there is a longitudinal section on which the geogrid is made continuous, and the surface mesh formed on the surfaces strips with corrugation elements, has diamond-shaped cells, and in each diamond-shaped cell there is an additional longitudinal diagonal rib. 2. A geogrid according to claim 1, characterized in that the width of the longitudinal section is greater than the distance between the centers of the extreme holes of the upper or lower row. 3. Geogrid according to claim 1, characterized in that the diameter of each hole is less than the distance between the centers of the holes of adjacent rows. 4. Geogrid according to claim 1, characterized in that the distance from the edge of the cell wall is greater than the diameter of the hole. 5. Geogrid according to claim 1, characterized in that the ends of the diagonal edges are connected to the nodes of the diamond-shaped cells. 6. The geogrid according to claim 1, characterized in that, to reinforce each transverse weld on one of the welded strips, rows of blind anchor recesses are made on its outer side, and on the other strip, on its outer side, in the region of the rows of recesses, there is additional flattened reinforcement ... 7. Geogrid according to claim 1, characterized in that the additional flattened reinforcement is a compressed-deformed seal formed by diamond-shaped cells, their nodes and diagonal ribs, which are deformed and partially fused together, and melted to the surface of the connected mesh strip.

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