RU134942U1 - ROAD GEOSET - Google Patents

Abstract

1. A road geogrid formed by superimposing two mutually intersecting systems of warp and weft threads with fastening intersections, the warp threads being evenly spaced through a distance corresponding to the width of the geogrid cell and made with a linear density equal to or greater than the weft thread, characterized in that for additional reinforcement of the geogrid in the direction of transport movement over a distance greater than the width of the cell, but less than the width of the tread of the vehicle, the warp yarns are laid with a 1.2-5.0 times higher linear density compared to the linear density of the other warp threads. 2. Geogrid according to claim 1, characterized in that it is made with cells of a rectangular shape. Geogrid according to claim 1, characterized in that it is made with square-shaped cells. The geogrid according to claim 3, characterized in that it is made with square cells with a side from 2.5 × 2.5 mm to 70 × 70 mm, preferably with a side from 15 × 15 mm to 50 × 50 mm. The geogrid according to claim 1, characterized in that the warp and weft threads are made of synthetic polymer or natural mineral threads. A geogrid according to claim 5, characterized in that the warp and weft threads are made of polyester, or polyamide, or polypropylene, threaded and / or twisted and / or pneumatically connected. A geogrid according to claim 5, characterized in that the warp and weft threads are made of glass fibers. A geogrid according to claim 5, characterized in that the warp and weft threads are made of basalt threads. The geogrid according to claim 1, characterized in that it is impregnated with synthetic copolymers.

Description

The utility model relates to the design of reinforcing geogrids designed to strengthen the soil, mainly during road construction. The claimed geogrid can be used to strengthen soft soils in the construction of temporary and technological roads, for example, along main roads constructed during the construction of pipelines. Also, the geogrid can be used in the construction of drilling sites subjected to high and intense loads, in the entrances to them and for reinforcing layers of pavement, both in the construction of new and in the repair and reconstruction of existing roads.

In the claimed solution, the "geogrid" is a flat mesh textile material formed by the application of two mutually intersecting systems of warp and weft threads, and the intersection of the threads are fastened with firmware, knitting or gluing.

From the prior art it is known "Temporary pavement of dirt roads", described in the USSR copyright certificate No. 1595986 A1, IPC: E01C 9/08 from 09/30/1990. The dirt road surface contains a grid fixed in the ground by means of anchor elements. The mesh cells are made of varying width of the coating with a minimum cell size at the location of the axle and with an increase in the size of the cells in the intercolumn space and outside the axle on the side sections of the road surface. Temporary coating solves the problem of increasing the strength of the road with the rational placement of geogrid material across the width of the coating. However, the geogrid design does not take into account that road transport is highly maneuverable; when moving, it repeatedly turns and deviates to the sides of the main line of movement. With any deviation from the given gauge, the vehicle enters unprotected or weakly protected sections of the road. Thus, the disadvantage of this technical solution is the too narrow reinforcement strip of the geogrid.

From the prior art it is known "Pavement" containing a geogrid of glass fibers, disclosed in the description of patent RU 2124089 C1, IPC: E01C 7/32, published 12/27/1998. The essence of the known solution lies in the fact that in the pavement a fiberglass mesh made of fiberglass was used, laid equidistantly to the surface of the coating so that the direction of laying the mesh coincides with the direction of movement of the vehicles, and the mesh cell sizes are selected based on the ratio 1≤a / in≤2, where "a" is the size of the side of the cell, coinciding with the direction of movement; "C" is the size of the side of the cell perpendicular to the direction of movement of the vehicles. In this case, the cell size is a≈c, where "c" is the maximum length of the contact spot between the surface of the road surface and the tire of the vehicle wheel in the direction perpendicular to the axis of the wheel. As indicated in the description of the invention, due to the use of a geogrid made in compliance with a predetermined cell size ratio, a layer having an increased bearing capacity is formed in the road surface. The increase in bearing capacity is achieved due to the ratio determining the cell size under conditions of equal strength of the warp and weft of the mesh under the action of shear and tensile deforming forces. The disadvantage of this technical solution is the relatively rare arrangement of the geogrid threads with respect to the area of the contact spot of the vehicle wheel, since the side of the cell is equal to the maximum length of the contact spot of the tire of the wheel with the surface of the road surface. It turns out that the contact spot of the wheel can fall between the filaments of the geogrid, acting on unprotected soil, which reduces the efficiency of using the geogrid.

In addition, the design described does not take into account that when using geogrids in dirt roads, the dynamic load of the vehicle wheels on warp threads located in the direction of travel is much higher than on duck threads located across the road surface. For example, a truck can follow the same warp along the entire length of the geogrid laid on a section of the road.

Hardening of warp threads is used, for example, in Huesker brand Fornit geogrids. The indicated road geogrid is formed by superposition of two mutually intersecting systems of warp and weft threads with fastening of the intersection points by knitting. Geogrids of this type have evenly spaced square cells, while all warp threads are 2-3 times thicker than weft threads. See: http://www.heesker.com/poccnr/geokunststoffe/produkte/fornitsuprsup/ (information was posted on the site in 2009). This solution is chosen as a prototype.

The disadvantage of this technical solution is the increased consumption of warp material for the manufacture of geogrids. When using the Fornit brand geogrid, up to eight hardened geo-mesh warp yarns get in contact with the wheel with the road, which leads to a significant overspending of geotextile material for the construction of a temporary road.

The claimed technical solution is aimed at solving the problem of reducing the material consumption of manufacturing a road geogrid while increasing the strength of field fishing and long-road roads by improving the structure of the reinforcing geogrid.

The technical result of the utility model is to reduce the consumption of threads for the manufacture of a road geogrid while increasing the strength of ground fishing and long-road roads by improving the structure of the reinforcing geogrid, which increases its rigidity and bearing capacity.

To solve this problem, a road geogrid is declared, formed by superimposing two mutually intersecting systems of warp and weft yarns with fastening intersections, the warp yarns being laid evenly through a distance corresponding to the width of the geogrid cell and made with a linear density greater than or equal to the density of the weft yarn. At the same time, for additional reinforcement of the geogrid in the direction of transport movement over a distance greater than the width of the cell, but less than the tread width of the vehicle, warp yarns with increased linear density 1.2-5.0 times higher than the linear density of the remaining warp threads were laid.

The road geogrid can be made with cells of a rectangular or square shape.

Depending on the operating conditions, the geogrid can be made in a wide range of cell sizes, for example, with a square side from 2.5 × 2.5 to 70 × 70 mm.

Most preferred are grid cell sizes selected in the range of 15 × 15 to 50 × 50 mm

Strengthening weak soils with reinforcing geogrids during the construction of temporary and technological dirt roads, for example, along main roads, leads to increased rigidity and bearing capacity of the road surface. At the same time, the efficiency of using a geogrid largely depends on the structure of the material. The cell size and location of the reinforcing threads of the geogrid should be calculated so that the dynamic loads from the wheels of the vehicles are transferred to the reinforcing geogrid as much as possible and do not lead to shifts and deformations of the road base.

The greatest dynamic impact on the road surface is exerted by trucks and other heavy vehicles, since they exert a greater specific pressure on the ground than, for example, tractors and pipe layers. However, the car tire size is standardized (see GOST R 52899-2007 "Pneumatic tires for power-driven vehicles and trailers. Technical conditions") therefore it is possible to calculate the optimal parameters of the geogrid structure to ensure that the vehicle’s wheel is anywhere on the surface of the road surface. will fall on at least one hardened thread of longitudinal reinforcement made with increased linear density.

The optimal distance L for additional reinforcement of the geogrid on the base is selected in the interval C> L≥2a, where

a is the width of the cell in the transverse direction;

C is the tread width of the vehicle wheel.

Since the size of car tires is standardized, we calculate the optimal distance L for additional reinforcement of the geogrid, based on the standards specified in GOST R 52899-2007 on “Pneumatic tires for utility vehicles and trailers”. Light truck tires (radial and diagonal) have a profile width of 154-228 mm. Truck tires of heavy vehicles have a profile width of 213 to 425 mm. Truck tires interact with the road surface of the dirt road with a contact patch, the width of which is equal to the width of the tire tread. The tread width for most types of tires is equal to 07, -0.8 of the width of the tire profile. Thus, the optimum distance b for the reinforcement on the base was selected no more than 105 mm for the expected transport load by light truck tires (154 × 0.7 = 108 mm).

The road geogrid is made of high-strength filaments resistant to the effects of natural factors: sun, water, temperature fluctuations, as well as acidity or alkalinity of the soil. Based on the operating conditions of the geogrid, as the warp and weft threads, we choose yarns from synthetic polymer or from natural mineral materials. Filaments from natural fibers for the manufacture of the claimed geogrid are not suitable, because they are rapidly destroyed in the natural environment.

If the geogrid is made of polymeric synthetic materials, then warp and weft are selected mainly from polyester, polyamide, or polypropylene yarns. These yarns are chemical complex yarns that consist of filaments. The multifilament yarn is untwisted or twisted and contains 20-50 torsions per meter, or pneumatically connected and contains 10-40 connections per meter.

If the geogrid is made from natural mineral materials, then warp and weft are chosen mainly from glass fibers or from basalt threads. Complex glass yarns and complex basalt threads use untwisted in the form of roving or twisted.

In another embodiment, the geogrid can be made by combining the warp and weft of dissimilar threads from polymer or from natural mineral materials.

The utility model is illustrated in Figure 1 and examples.

The figure 1 shows the structure of the claimed road geogrid formed by the imposition of two mutually intersecting systems of warp threads 1 and weft 2 to obtain a flat mesh material with square cells 25 × 25 mm in size. Moreover, the warp threads 1 are laid evenly through a distance corresponding to the width of the geogrid cell, and are made with a linear density greater than the weft threads 2.

Above the image of the geogrid, a conditional image of the tire 4 of a freight vehicle is shown, and the width of the profile 5 of the tire 4 is greater than the width of its tread 6.

For additional reinforcement of the geogrid in the longitudinal direction through a distance of 100 mm multiple of the quadruple width of the cell, yarns 3 with increased linear density with respect to other warp yarns are laid. The distance of 100 mm between threads 3 with increased linear density is less than the minimum tread width of the vehicle tire 4 (which is 154 × 0.7 = 108 mm for the light diagonal tire of a truck).

Example 1

They made a road geogrid for soil pavement along a highway laid along a gas pipeline.

The geogrid was made using a warp knitting machine in the form of a flat mesh material formed by superimposing two mutually intersecting systems of warp and weft threads, with knitting the intersection of warp and weft threads with the help of stitching threads. As the warp threads, elongated polyester yarns with a thickness of 167 tex were used, chopped into 6 yarns to obtain a multifilament yarn with a thickness of 167 × 6 = 1002 tex. Polyester yarns with a thickness of 220 tex or more, threaded into three yarns and twisted to form a multifilament yarn with a thickness of 660 tex, are used as weft yarns, and textured and / or pneumatically connected polyester yarns with a thickness of 37.2 tex are used as piercing yarns. The warp yarns are laid evenly through a distance corresponding to the width of the geogrid cell 50 mm.

Moreover, for additional reinforcement in the longitudinal direction through a distance of 100 mm (a multiple of the double cell width), warp yarns with 2 times higher linear density 2004 tex. (1002 × 2 = 2004 tex) were laid. A distance of 100 mm less than the tread width of the truck’s diagonal tire is selected according to GOST R 52899-2007. (According to the specified GOST R 52899-2007, the profile width of a light diagonal truck tire is from 154 to 218 mm).

The geogrid was used to reinforce the embankment of a dirt road erected on waterlogged soils.

The use of the geogrid of the claimed structure showed an increase in the strength and bearing capacity of the road surface in the spring and autumn period of operation.

Example 2

A road geogrid was produced for the unpaved surface of a commercial technological road.

The geogrid was made using a warp knitting machine in the form of a flat mesh material with square cells 32 × 32 mm, formed by superimposing two mutually intersecting systems of warp and weft threads, with the stitching of the intersection of warp and weft threads with the help of 17.7 tex thick stitched pneumocoupled threads. Elongated polypropylene yarns with a thickness of 111 tex, crushed into 9 yarns and twisted to form a multifilament yarn with a thickness of 999 tex, were used as warp threads. Polypropylene yarns with a thickness of 220 tex or more, chopped into 4 yarns and twisted to form a multifilament yarn with a thickness of 880 tex, are used as weft yarns. The warp threads are laid evenly through a distance corresponding to the width of the geogrid cell 32 mm.

In this case, for additional reinforcement in the longitudinal direction through a distance of 96 mm (32 × 3 = 96 mm), warp yarns with 3 times higher linear density of 2997 tex. (999 × 3 = 2997 tex) were laid. A distance of 96 mm less than the tread width of the truck’s diagonal tire is selected according to GOST R 52899-2007. (According to the specified GOST R 52899-2007, the profile width of a light diagonal truck tire is from 154 to 228 mm. The minimum tread width interacting with the road surface is 154 × 0.7 = 107.8 mm). The geogrid was used to reinforce the embankment of a dirt road erected on waterlogged soils. The use of the geogrid of the claimed structure showed an increase in the strength and bearing capacity of the road surface of the fishing road during year-round operation.

Example 3

They made a road geogrid for unpaved roads to the drilling site.

The geogrid was made using a warp knitting machine in the form of a flat mesh material with square cells of 20 × 20 mm, formed by superimposing two mutually intersecting systems of warp and weft threads, with sizing of the intersection of warp and weft threads. As the warp threads, 136 tex thick glass yarns were used, chopped into 6 strands to produce a multi-strand 816 tex thick yarn (136 x 6 = 816 tex). Polypropylene yarns with a thickness of 220 tex or more, cut into 3 yarns and twisted to form a multifilament yarn with a thickness of 660 tex, are used as weft yarns. The warp threads are laid evenly through a distance corresponding to the width of the geogrid cell 20 mm.

Moreover, for additional reinforcement in the longitudinal direction, warp yarns with a 1.5 times higher linear density (816 × 1.5 = 1224 tex) were laid through a distance of 100 mm (equal to five times the cell width). A distance of 100 mm less than the tread width of the vehicle’s diagonal truck tire is selected according to GOST R 52899-2007. (According to the specified GOST R 52899-2007, the minimum profile width of a light truck tire is 154 mm, and the tread width is 108 mm).

The use of the geogrid of the claimed structure showed an increase in the strength and bearing capacity of the road surface of the access road during year-round operation.

Example 4

A road geogrid was made for the repair of soil cover along a highway.

The geogrid was made using a warp knitting machine in the form of a flat mesh material with rectangular cells of 45 × 50 mm, formed by superposition of two mutually intersecting systems of warp and weft threads, with knitting at the intersection of the warp and weft threads. As the warp yarns, basalt yarns with a thickness of 675 tex were used, chopped into 9 yarns to obtain a complex yarn with a thickness of 675 × 9 = 6075 tex. As weft threads use the same polyester threads with a thickness of 675 × 7 = 4725 tex. The warp threads are laid evenly through a distance corresponding to the width of the geogrid cell 45 mm.

At the same time, for additional reinforcement in the longitudinal direction through the distance of 90 mm, warp yarns with 2 times higher linear density (6075 × 2 = 12150 tex) are laid. A distance of 90 mm is less than the tread width of the truck’s diagonal truck tire selected according to GOST R 52899-2007. (According to the specified GOST R 52899-2007, the minimum profile width of a light diagonal truck tire is 154 mm, and the tread width is 108 mm).

The use of the geogrid of the claimed structure showed, after repairing the highway, increasing the strength and bearing capacity of the road surface during year-round operation.

Example 5

A road geogrid was made with a square cell side of 15 mm for an unpaved road surface, as described in Example 1.

In this case, for additional reinforcement in the longitudinal direction through a distance of 90 mm, warp yarns with a 5-fold increased linear density of 3340 tex. (668 × 5 = 3340 tex) are laid. A distance of 90 mm less than the tread width of the diagonal tire of a light truck is selected according to GOST R 52899-2007, the minimum width of which is 154 mm, and the corresponding tread width is 108 mm.

The use of the geogrid of the claimed structure showed an effective increase in the strength and bearing capacity of the road surface in the spring and autumn period of operation.

Example 6

A road geogrid was made for soil covering along a highway laid along a production pipeline. The road surface is designed for the movement of heavy vehicles.

The geogrid was made using a warp knitting machine in the form of a flat mesh material formed by superimposing two mutually intersecting systems of warp and weft threads, with knitting the intersection of warp and weft threads with the help of stitching threads. As the warp threads, elongated polyester yarns with a thickness of 167 tex were used, chopped into 4 yarns to obtain a multifilament yarn with a thickness of 167 × 4 = 668 tex. Polyester yarns with a thickness of 220 tex or more, tripled into three yarns and twisted to form a multifilament yarn 660 tex thick, are used as weft yarns, and textured and / or pneumo-connected 37.2 tex polyester yarns are used as broaching yarns. The warp yarns are laid evenly through the distance corresponding to the width of the cell geogrid 2.5 mm

In this case, for additional reinforcement in the longitudinal direction through a distance of 100 mm (equal to 40 times the cell width), warp yarns with a 4-fold increased linear density of 2672 tex (668 × 4 = 2672 tex) were laid. A distance of 100 mm less than the tread width of the truck’s diagonal tire is selected according to GOST R 52899-2007. (According to the specified GOST R 52899-2007, the profile width of a light diagonal truck tire is from 154 to 218 mm, and truck tires of heavy vehicles have a profile width from 213 to 425 mm).

The geogrid was used to reinforce the embankment of a dirt road erected on waterlogged soils.

The use of the geogrid of the claimed structure showed an increase in the strength and bearing capacity of the road surface in the spring and autumn period of operation when using heavy vehicles.

Claims (9)

1. A road geogrid formed by superimposing two mutually intersecting systems of warp and weft threads with fastening intersections, the warp threads being evenly spaced through a distance corresponding to the width of the geogrid cell and made with a linear density equal to or greater than the weft thread, characterized in that for additional reinforcement of the geogrid in the direction of transport movement over a distance greater than the width of the cell, but less than the width of the tread of the vehicle, the warp yarns are laid with a 1.2-5.0 times higher linear density compared to the linear density of the remaining warp threads. 2. The geogrid according to claim 1, characterized in that it is made with rectangular cells. 3. The geogrid according to claim 1, characterized in that it is made with square cells. 4. The geogrid according to claim 3, characterized in that it is made with square cells with a side from 2.5 × 2.5 mm to 70 × 70 mm, preferably with a side from 15 × 15 mm to 50 × 50 mm. 5. The geogrid according to claim 1, characterized in that the warp and weft are made of synthetic polymer or natural mineral threads. 6. The geogrid according to claim 5, characterized in that the warp and weft threads are made of polyester, or polyamide, or polypropylene, threaded and / or twisted and / or pneumoconnected. 7. The geogrid according to claim 5, characterized in that the warp and weft are made of fiberglass. 8. The geogrid according to claim 5, characterized in that the warp and weft are made of basalt threads. 9. The geogrid according to claim 1, characterized in that it is made with impregnation with synthetic copolymers.

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