KR100635207B1 - Geogrid composed of fiber reinforced high molecular resin strip and method for producing the same - Google Patents

Abstract

The present invention relates to a geogrid using a fiber-reinforced polymer strip and a method of manufacturing the same.

The present invention relates to a geogrid having a high tensile strength, low tensile strain, low creep deformation characteristics, and improved construction resistance by reinforcing a polymer strip with reinforcing fibers, and a method of manufacturing the same.

The present invention supplies a fiber-reinforced polymer strip prepared in advance to form a lattice shape with respect to the coextrusion strip while extruding the polymer strip so that the fiber is present in the polymer by supplying the fiber to the coextrusion die through which the extruded molten resin flows.

The lattice-shaped geogrid is manufactured by pressing and heating the radial strips and the upward strips superimposed on each other and then bonding them.

Geogrid composed of the fiber-reinforced polymer strips thus prepared is used as reinforcement in civil engineering, such as retaining wall reinforcement, slope reinforcement, soft ground reinforcement.

Geogrid, Reinforcing Fiber, Fiber Reinforcing Radial Strip, Fiber Reinforcing Upward Strip, Polymer Resin, Extruder, Coextrusion Die

Description

Geogrid composed of fiber reinforced high molecular resin strip and method for producing the same}

1A is an overall process diagram of the present invention as viewed from the side.

1b is an overall process diagram of the present invention as viewed from above.

2 is a process diagram showing one embodiment of the present invention.

Figure 3 is a process diagram showing another embodiment of the present invention.

Figure 4 is a longitudinal cross-sectional view of the die for coextrusion used in the present invention.

5, 6a, 6b, 7a and 7b are perspective views showing the lattice shape of the radial strip and the upward strip.

8A is a cross-sectional view of a fiber reinforced strip of circular cross-section according to the present invention.

Figure 8b is a cross-sectional view of the fiber reinforced strip of the square cross-section according to the present invention.

The present invention relates to a geogrid using a fiber reinforced polymer strip for civil engineering having a high tensile strength, low tensile strain, low creep deformation characteristics and excellent construction resistance by reinforcing a polymer strip with a reinforcing fiber and a method of manufacturing the same. will be.

Geogrid materials used for geogrid reinforcement, slope reinforcement, road reinforcement, and the like have been developed in various ways.

Geogrids can be divided into plastic geogrids and textile geogrids, depending on the manufacturing method and materials.

As described in Korean Patent Publication No. 91-5998 according to the manufacturing method, the plastic geogrid is manufactured by passing a polymer sheet passing through an extruder through a roller, punching holes in a grid-like grid, and stretching it in one or two axes. Geogrid, and the polymers are extruded into strips, such as GB 2266540, EP 1038654, WO 94/26503, WO 99/28564, and stretched in one direction to form radial and upward strips, which are then subjected to laser or ultrasonic There is a geogrid bonded in a lattice form.

However, in the case of a product prepared by stretching after drilling, since the material is polypropylene or high-density polyethylene, there is a problem in the stability of the reinforcement structure when using this product due to the high strain occurring during a long load is applied.

In addition, since the apparatus for drilling and stretching the polymer sheet or the laser or ultrasonic bonding apparatus is huge and expensive, manufacturing costs are high.

Textile geogrid, like Korean Patent Publication No. 98-2337, supplies high-strength fibers in the warp and weft directions to form a lattice-shaped fabric, strengthens the contact point at the point of protection and bonding of the warp yarn, In order to improve the resistance to polyvinyl chloride, bitumen, acrylic, latex and rubber-based resin and the like, as a light weft, a high strength polyester is mainly used. However, the textile geogrid has excellent tensile and creep properties, but in order to coat the coated synthetic resin on the textile geogrid fabric, the synthetic resin must be dissolved in a suitable solvent.

The manufacturing method of such a textile geogrid is not only complicated and economically desirable, but also has a disadvantage in that the construction resistance is lowered because geogrid is likely to be damaged depending on soil conditions during construction.

Therefore, there is a need for a geogrid having improved high creep strain, which is a disadvantage of the plastic geogrid, and a low workability, which is a disadvantage of the textile geogrid.

USP 5068142 is characterized in that fibers are present in the matrix of the polymer resin, 10% to 70% of each fiber is separated from each other in the polymer matrix, and the remainder forms at least one fiber bundle and is in direct contact with each other. It is the first to mention a net-like product in which such fiber reinforced strips are bonded.

However, the manufacturing method of the US patent manufactures a geogrid by pelletizing a fiber-reinforced polymer strip and then extruding or injection molding, and does not specifically mention the method of joining the radial direction and the upper direction.

USP 5045377 describes a device and a material for making a network structure by crossing fiber reinforced polymer strips at regular intervals from each other.

That is, a precursor coated with a polymer, which is the first element, is inserted into the crosshead die to form a network structure, and the second polymer element is joined to the first element by a device in which the front of the die moves up and down. Form a structure.

This method uses precursors as the first element and is not a method of making products in a continuous process using coextrusion dies.

As mentioned above, research on the manufacturing method of new geogrid has been conducted variously from various angles. However, since the manufacturing method and apparatus are very complicated and the product characteristics of the geogrid are not shown well, the function as a reinforcement which is the original function of the geogrid is fully exhibited. There is a disadvantage that can not.

The present invention can mass-produce geogrids in a continuous process by a simple manufacturing method, and in particular, to provide a geogrid and a method for producing the geogrid excellent resistance to creep deformation compared to the products known so far.

The present invention is to solve the above technical problem, polyolefin resin such as polyethylene, polypropylene and polyester resin as a polymer matrix, in order to improve the physical properties and shape stability, such as strength, heat resistance of the polymer resin Reinforcing fibers such as high strength polyester yarn, glass fiber and carbon fiber were used, and the polymer matrix and the reinforcing fiber were coextruded with a coextrusion die to prepare a fiber reinforced polymer strip, and then the fiber reinforced polymer prepared in advance It relates to a geogrid using a fiber-reinforced polymer strip, characterized in that the lattice bonded by a continuous process together with the strip and a method of manufacturing the same.

That is, in the present invention, both the radial and upper strips are reinforced with reinforcing fibers, and the pre-fabricated fiber-reinforced polymer strips and the co-extruded fiber-reinforced polymer strips are formed in a lattice shape, and then the radial strips superimposed each other. And the upper strip is bonded to the primary pressing roller, and then heated again through the heating device to soften or melt the polymer resin, characterized in that the lattice geogrid is produced by bonding with a secondary pressing roller.

In addition, the present invention is characterized in that the reinforcing properties of the product can be better expressed by varying the arrangement of the lattice theodolite strip.

In the present invention, the polymer resin 14, which is a material of the fiber-reinforced polymer strip, includes a polyolefin-based resin such as polyethylene and polypropylene having a melt index (MI) of 1 to 60 g / 10 minutes and polyethylene terephthalate having an IV of 0.64 to 1.0. terephthalate (PET), polyamides, polyacrylates, polyacrylonitrile, polycarbonates, polyvinylchloride (PVC), polystyrene, polybutadiene Reinforcing fibers 11 are polyester fibers, glass fibers, aramid fibers, carbon fibers, stainless steel fibers, copper fibers, amorphous metal fibers, and the sum of the cross sectional areas of the reinforcing fibers is 20 to 80% of the total cross sectional area of the strip. Configure If the cross sectional area of the reinforcing fibers is less than 20%, the resistance to creep deformation, which is greatly influenced by the reinforcing fibers, is decreased. When the tensile force is applied, the reinforcing fibers are pulled out of the polymer matrix, and the cross sectional area is 80%. If it exceeds, the thickness of the polymer resin layer surrounding the outside of the reinforcing fiber is so thin that the reinforcing fiber is not protected against external impacts and damaged during external work. Degrades.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

In the manufacturing apparatus used in the present invention, as shown in FIG. 1, the extruder 1 for melting the polymer resin 14, the molten polymer resin 14, and the reinforcing fiber 11 meet with the fiber-reinforced polymer strips 12 and 13. A co-extrusion die (2) for forming a, an upward strip feeder (3) for feeding the upward strip (13), an upward strip (13) and a radial strip (12) superposed at right angles to each other. To cool the heating apparatus 4, the primary and secondary pressing rollers 6a and 6b and, if necessary, the geogrid bonded to the pressing rollers 6a and 6b to make them adhere to each other. It consists of a cooling roller 7 for winding, and a winding roller 10 for winding the geogrid cooled at a constant speed.

Looking at the manufacturing apparatus in detail as follows.

The coextrusion die 2 used in the present invention is shown in FIG.

To produce a wide product, 10 to 40 reinforcing fiber strips 12 and 13 must be coextruded at intervals of 5 to 100 mm at the same time.

Therefore, in the present invention, the coextrusion die 2 is designed as shown in FIG. 4 so that the reinforcing fibers 11 flow in the extrusion direction of the resin 14.                     

First, the reinforcing fiber 11 is introduced through the die inlet 15, and at the same time, the molten polymer resin 14 is introduced through the resin inlet 17, so that the reinforcing fiber 11 and the resin ( 14 meet and form the fiber reinforcement strips 12, 13 past the die outlet 16.

At this time, the number of die outlets 16 is 10-40, Preferably you may be 10-20.

The spacing of the die outlets 16 is such that the distance between the radial strip centers is between 5 and 100 mm, and the spacing between the die outlets is preferably such that between 30 and 70 mm.

On the other hand, the reinforcing fibers 11 introduced into the inlet 15 may be introduced into one strand, two strands or more strands to change the arrangement of the reinforcing fibers 11 in the strip cross section.

In this way, as shown in FIGS. 8A and 8B, the fiber-reinforced polymer strips 12 and 13 in which the reinforcing fibers 11 are arranged in various shapes can be obtained. When the die outlet 16 is changed into a circle or a square, the cross section is rounded. It is possible to make strips having a shape 8a and a square shape 8b.

The fiber-reinforced polymer strips 12 and 13 have a cross section of 1 to 20 mm in width, 1 to 5 mm in thickness, or a circular 1 to 10 mm in diameter.

In addition, in order to create a product width that is easy to use in civil engineering, in the process of Figure 1 by placing a plurality of extruders 1 transversely can produce a product having a width of 1 ~ 5m, preferably 2 ~ 4m width.

In FIG. 1 the upward strip feeder 3 may contain a prefabricated constant length fiber reinforced upward strip 13 and may be stripped at a constant time interval and the upward strip holder 3a and strips produced. It consists of an upward strip conveying device 3b which carries the upward strip away from the holder and drops the upward strip at regular intervals to the radial strip conveying device in which the radial strip 12 is arranged and conveyed.

The grid size is determined by the time that the upstream strip falls, and the grid size (distance between the upstream strip centers) is usually 10 to 100 mm, preferably 30 to 70 mm so that the time the up strip can be adjusted The upward strip feeder 3 is designed.

The upward strip 13 is usually dropped at an angle of 80 to 100 ° with respect to the radial strip 12, and more preferably is dropped to achieve 90 °.

After the upward strip 13 is placed on the radial strip 12 which has not yet solidified, it is first bonded through the pressing roller 6a and passed through the heating apparatus 4 to enhance adhesion.

The heating device is composed of two heating plates 4a and 4b, and the two plates are adjustable in temperature to create an ambient temperature at which the resin covering the outside of the reinforcing fiber may soften or melt.

For example, when used as a polypropylene, since the melting temperature of the polypropylene is generally 160 ℃, by controlling the temperature of the heating plate (4a, 4b) so that the temperature in the heating device (4) is 140 ~ 180 ℃.

Accordingly, when the lattice is formed, the surface of the polymer resin 14 surrounding the reinforcing fiber 11 is softened or melted while the upper strips 12 and 13 pass through the heating device 4 so that the longitudinal strips are softened. Bonded, the strip passed through the heating device is passed through the secondary pressing roller (6b) to enhance the adhesion of the longitudinal, upward strip.

The bonded product has a lattice form as shown in FIG. 5.

Then, if necessary, after cooling in the cooling tank 7, it is wound on the take-up roller 10.

In the present invention, by varying the arrangement of the upward strip feeder (3) and the extruder (1), it is possible to make a variety of products in which the light, upward strip is bonded variously.

The process of FIG. 2 uses the upward strip feeder 3 to displace the upward strip 13 at regular intervals on the strip conveying apparatus 5 and to move it forward.

The radial strips 12 co-extruded from the coextrusion die 2 on the upper and the arranged upward strips 13 are radially supplied and bonded.

Thus bonded fiber reinforcing strip is passed through the primary pressing roller (6a), the heating device (4), the secondary pressing roller (6b) as shown in Figure 1 and the longitudinal strip is bonded to the winding roller (10) do.

The up and down arrangement of the radial strip 12 which meets the upward strip 13 may be adjusted to have shapes such as 6a and 6b.

When the radial strips 12 extruded from above and below are alternately arranged and bonded to each other, the radial strips 12 are bonded to each other to form a shape such as 6a. When the radial strips 12 are arranged to face each other, the radial strips 12 are maintained as shown in FIG.

In the case of FIG. 3, the upper and lower strips 13 are bonded to each other on the contrary to the case of FIG. 2.

This is in addition to the process of FIG. 1, in which the device is arranged such that the upward strip 13 is fed from below.

In this case, the product maintains the shape as shown in Figs. 7A and 7B.

When the upper and lower upper strips 13 adhered to the radial strips 12 to be extruded are supplied with a predetermined time difference and adhered to each other, the upper and lower upper strips 13 are formed as shown in FIG. 7A. If supplied, a product of the type shown in FIG. 7B can be obtained.

In the case of FIG. 7B, the bonding strength of the theodolite strip 12 is excellent.

The physical property measurement method of the Example is as follows.

* Wide tensile strength: ASTM D 4595

The tension between the clamps attached to the top and bottom of the strain-controlled tensile tester is tensioned at a rate of 10 ± 3% / min.

The width of the sample is measured to be 20 cm.                     

* Creep Test: ASTM D 5262

The purpose of this study is to evaluate the creep behavior of geogrids under constant temperature under constant temperature conditions, and to determine the coefficient of tensile strength reduction due to creep, which is considered when calculating the long-term design tensile strength.

The load for creep deformation evaluation was 45% of the maximum tensile strength of the geogrid sample. Tensile deformation was measured over 1,000 hours using an automatic measurement system.

* Construction resistance evaluation: ASTM D 5818

After treating the foundation road in the same way as when constructing the actual structure, install a sample of geogrid with a minimum area of 10m ² , install the fill material on the top, and then compact the same as when constructing the actual structure.

As the fill material, aggregates up to 20 mm in size were used.

After the compaction was completed, the compacted aggregate was removed so as not to damage the geogrid, the geogrid sample was extracted, and the tensile test was performed on the extracted sample to compare the tensile strength of the raw material.

Therefore, the workability is expressed by the percentage of decrease in strength.

Example 1

A fine strip 13 of denier polyester high strength yarn and a polypropylene resin having a melt index of 4 were co-extruded to prepare a upward strip 13, and then prepared in the upward strip feeder 3, using the apparatus of FIG. 1A. Then, the extruder 1 is supplied with a polypropylene resin 14 having a melt index of 4 to the coextrusion die 2, and copolyextrusion is supplied to the coextrusion die 2 with a polyester high strength yarn having a fineness of 24,000 deniers. After forming, the lattice is formed by dropping the previously prepared upward strip 13 at right angles on the radial strip 12 extruded using the upward strip feeder 3, and then passing through the pressing roller 6a. After passing the heating device 4 primarily bonded and heated to 160 ° C., the radial strip 12 and the upward strip 13 are bonded to each other so that the upward strip 13 is attached to one side of the radial strip 12. Geogrid having the form of FIG. Prepared.

Table 1 shows the number of ribs per unit length of the fabricated geogrid (ribs / m), wide tensile strength (kN / m), tensile strain (%), creep strain (%), and strength reduction rate (%).

Example 2

Fiber-reinforced geogrids were prepared in the same manner as in Example 1 using glass fibers instead of polyester fibers as reinforcing fibers.

At this time, the glass strip of 2,600 tex was used for the upward strip 13, the glass fiber of 4,400 tex was used for the radial strip 12.

The number of ribs per unit length of the prepared geogrid (ribs / m), the wide tensile strength (kN / m) is shown in Table 1.

Example 3

According to the process of Figure 2, the fineness of 16,000 denier polyester high-strength yarn and polypropylene resin having a melt index of 4 to co-extruded to produce the upward strip (13) and then upward with the upward strip feeder (3) The extruder (1) so that it is continuously dropped at regular intervals to the strip carrier (5), and the fiber-reinforced radial strip (12) is fed at right angles to the upward strip (13) above and below the upward strip (13). A polypropylene resin having a melt index of 4 was fed to the coextrusion die 2, and co-extruded by supplying a polyester high strength yarn having a fineness of 24,000 deniers to the coextrusion die 2.

At this time, the radial strips 12 supplied up and down of the fiber reinforced upward strips 13 were staggered so as not to meet each other.

The longitudinal strips 12 and 13 thus arranged are first bonded via the pressing roller 6a, and after passing the heating device 4 heated to 160 ° C., the radial strips by the secondary pressing roller 6b. And the upward strips were bonded to each other to form a geogrid having a shape in which the radial strips 12 of the upper and lower sides were staggered on both sides of the uniform strips 13 at regular intervals as shown in FIG. 6A.

Table 1 shows the number of ribs per unit length of the fabricated geogrid (ribs / m), wide tensile strength (kN / m), tensile strain (%), creep strain (%), and strength reduction rate (%).

Example 4

The geogrids were fabricated using the same materials and fabrication process as in Example 3 by arranging the radial strips 12 so that the radial strips 12 arranged above and below the upward strip 13 overlap each other as in FIG. 6B.

The number of ribs per unit length of the fabricated geogrid (ribs / m), wide tensile strength (kN / m), tensile strain (%), creep strain (%), strength reduction rate (%) is shown in Table 1.

Example 5

Fiber-reinforced geogrids were prepared in the same manner as in Example 3 using glass fibers instead of polyester fibers as reinforcing fibers.

At this time, the glass strip of 2600 tex was used for the upper strip 13, and the glass fiber of 4,400 tex was used in the radial direction 12.

Table 1 shows the number of ribs per unit length (ribs / m) and the wide tensile strength (kN / m) of the fabricated geogrid.

Example 6

Fiber-reinforced geogrids were prepared in the same manner as in Example 4 using glass fibers instead of polyester fibers as reinforcing fibers.

In this case, the glass strip of 2,600 tex was used for the upward strip 13, and the glass fiber of 4,400 tex was used in the radial direction 12.

Table 1 shows the number of ribs per unit length (ribs / m) and the wide tensile strength (kN / m) of the fabricated geogrid.

Example 7

According to the process of FIG. 3, a polyester reinforced fiber having a fineness of 24,000 deniers is supplied to the coextrusion die 2, and at the same time, polypropylene having a melt index of 4 is supplied to the coextrusion die 2, thereby providing a fiber reinforced radial strip ( 12) while continuously extruding, using the upward strip feeder (3) using the upward strip (13) prepared in advance by co-extrusion of 16,000 denier polyester high-strength yarn and polypropylene resin having a melt index of 4 The lattice was formed by successively dropping the radial strip 12 at regular intervals above and below the radial strip 12 to be perpendicular to the co-extruded radial strip 12.

At this time, the upward strips 13 supplied under the radial direction and the upward strips 13 supplied above the radial direction are staggered so as not to meet each other.

The radial strips 12 and the upward strips 13 stacked on each other are pressed by the primary pressing rollers 6a and passed by the heating apparatus 4 heated to 160 ° C. by the secondary pressing rollers 6a. The radial and upward strips were bonded to form geogrids in which the upward strips 13 were alternately formed on both sides of the radial strips 12 at regular intervals as shown in FIG. 7A.

Table 1 shows the number of ribs per unit length of the fabricated geogrid (ribs / m), wide tensile strength (kN / m), tensile strain (%), creep strain (%), and strength reduction rate (%).

Example 8

Geogrids are fabricated using the same materials and manufacturing process as in Example 7 by arranging the upward strips 13 such that the upward strips 13 arranged above and below the radial strip 12 overlap each other (FIG. 7B). It was.

The number of ribs per unit length (ribs / m), tensile strength (kN / m), tensile strain (%), creep strain (%), and strength reduction rate (%) of the prepared geogrid are shown in Table 1.

Example 9

Fiber reinforced geogrid was prepared in the same manner as in Example 7 using glass fibers instead of polyester high strength yarn as the reinforcing fibers.

At this time, the glass strip of 2600 tex was used for the upper strip 13, and the glass fiber of 4,400 tex was used in the radial direction 12.

The number of ribs per unit length of the prepared geogrid and the wide tensile strength (kN / m) are shown in Table 1.

Example 10

Fiber-reinforced geogrids were prepared in the same manner as in Example 8 using glass fibers instead of polyester high strength yarns as reinforcing fibers.

In this case, the glass strip of 2,600 tex was used for the upward strip 13, and the glass fiber of 4,400 tex was used in the radial direction 12.

The number of ribs per unit length of the prepared geogrid and the wide tensile strength (kN / m) are shown in Table 1.

Comparative Example 1

The polyester high-strength fibers are fed in the warp and weft directions, respectively, and woven into a lattice-like fabric, and then coated with polyvinyl chloride resin to strengthen the weft's protection and contact at the bonding point, and to resist sunlight and ultraviolet rays. The physical properties of the textile geogrid product manufactured by the improved conventional manufacturing method were measured.

Table 1 shows the number of ribs per unit length (ribs / m), the wide tensile strength (kN / m), the tensile strain (%), the creep strain (%), and the strength reduction rate (%) of the textile geogrid.

Comparative Example 2

After extruded into a sheet using a polyolefin resin, the physical properties of the plastic geogrid manufactured by the conventional method for producing a plastic geogrid is punched and uniaxially stretched.

The number of ribs per unit length of the plastic geogrid (ribs / m), the wide tensile strength (kN / m), tensile strain (%), creep strain (%), strength reduction rate (%) is shown in Table 1.

<Table 1>

division Radial direction Up direction Ribs (ribs / m) Wide tensile strength (kN / m) Tensile strain (%) Strength reduction rate (%) Creep Strain (%) Ribs (ribs / m) Wide tensile strength (kN / m) Tensile strain (%) Example 1 30 57 10.3 11.5 5.2 25 31 10.3 Example 2 30 55 3.1 - - 25 33 2.8 Example 3 30 57 11.0 11.2 5.4 25 36 10.2 Example 4 30 116 10.7 12.4 5.2 25 33 10.5 Example 5 30 55 2.8 - - 25 34 3.0 Example 6 30 112 2.5 - - 25 36 2.8 Example 7 30 58 9.9 12.1 5.0 25 30 10.5 Example 8 30 62 10.5 11.4 5.2 25 64 10.6 Example 9 30 60 2.4 - - 25 35 2.6 Example 10 30 62 2.9 - - 25 65 2.5 Comparative Example 1 41 69 9.7 15.8 5.1 40 36 12.7 Comparative Example 2 43 54 12.9 11.2 15.0 - - -

As shown in the examples and comparative examples, the product of the present invention, which is mainly used as a buried material for civil engineering, has the following advantages when compared to existing products.

First, in Table 1, the fiber-reinforced geogrid of the present invention and the conventional textile geogrid of Comparative Example 1 show similar values in the wide tensile strength (kN / m), tensile strain (%), and creep strain (%), but the strength The reduction rate (%) shows a larger value of the plastic geogrid of Comparative Example 1 than the fiber reinforced geogrid of the present invention.

Since the strength reduction rate (%) is a value that can predict the workability, it can be seen that the high strength reduction rate is not good in the workability.                     

Therefore, the fiber-reinforced geogrid of the present invention shows that the construction resistance is superior to the conventional textile geogrid, which means that the product of the present invention is protected by a polymer resin such as polyethylene or polypropylene, compared to the conventional textile geogrid Because it can prevent damage during construction, and because the construction is greatly improved so that it can be used in rocky soil.

Second, when comparing the product of the present invention and the plastic geogrid product of the conventional Comparative Example 2, the broad tensile strength (kN / m), the strength reduction rate (%) shows similar characteristics to the product of the present invention and the conventional plastic geogrid product However, there is a difference in tensile strain (%) and creep strain (%).

In particular, the creep strain (%) shows a value 3 times larger than that of Comparative Example 2.

This shows that the existing plastic geogrid has a lower resistance to creep strain than the geogrid of the present invention. This is because polyethylene, polypropylene, etc., which are materials of the conventional plastic geogrid, have high creep strain due to their molecular structure and arrangement. The creep strain of plastic geogrid was high, and the fiber reinforced geogrid of the present invention was greatly reinforced with creep strain because it was reinforced with fibers having high resistance to creep strain.

Third, the geogrid changes the friction or pullout resistance with the soil depending on the size of the grid and the number of ribs in the radial and upward directions.

For reference, since the product of the present invention is largely determined by the physical properties of the radial direction, the physical properties of the conventional textile geogrid or plastic geogrid were compared only by the radial properties.

The geogrid according to the present invention is made by laminating the warp and weft strips prepared by using a polymer resin as a matrix and co-extruded reinforcing fibers together with the resins in a lattice shape, and thus, high tensile strength, low tensile strain, and low by reinforcing fibers. It exhibits creep deformation characteristics, and the polymer resin forms a matrix to have excellent construction resistance, and thus can be used as a reinforcing material for various civil structures.

In addition, the present invention can be produced in a variety of shapes of the grid shape of the fiber reinforcing strips (12, 13) of the upward direction, it is possible to manufacture a variety of geogrid to suit the characteristics of the civil site.

In addition, since the present invention can be mass-produced in a continuous process using a simple manufacturing method, it is possible to manufacture a geogrid at a low cost.

Claims (18)

Coextruding the molten polymer resin and the reinforcing fibers in a coextrusion die to produce a longitudinal fiber reinforced polymer strip, and the radial fiber reinforced polymer strips produced by coextrusion continuously and another prefabricated fiber Forming a reinforcing polymer strip in a lattice form, and the method of manufacturing a geogrid using a fiber-reinforced polymer strip, characterized in that consisting of the step of pressing, heating and bonding the fiber-reinforced polymer strip of the lattice diameter, the upper direction. [Claim 2] The method of manufacturing a geogrid using a fiber-reinforced polymer strip according to claim 1, wherein the fiber-reinforced polymer strip is formed into a lattice by supplying another pre-fabricated fiber-reinforced strip to only one side of the radial fiber-reinforced polymer strip. According to claim 1, Geogrid manufacturing using a fiber-reinforced polymer strip, characterized in that to form a lattice by supplying another two pre-fabricated fiber-reinforced polymer strips prepared in advance on the upper, lower surface of the radial fiber-reinforced polymer strip. Way. The fiber according to claim 1, wherein two radial fiber reinforced polymer strips prepared by co-extrusion are continuously formed on the upper and lower surfaces of the upper and lower fiber reinforced polymer strips. Geogrid manufacturing method using reinforcing polymer strips. According to claim 1, wherein the polymer is a polyolefin resin having a melt index (MI) of 1 to 60 g / 10 minutes or polyethylene terephthalate (PET), polyamides, and poly having an intrinsic viscosity (IV) of 0.64 to 1.0. It is selected from the group consisting of acrylates (polyacrylates), polyacrylonitrile, polycarbonates, polyvinylchloride (PVC), polystyrene, polybutadiene (polybutadiene) Method for preparing geogrid using fiber reinforced polymer strip. According to claim 1, wherein the reinforcing fibers are selected from the group consisting of polyester fibers, glass fibers, aramid fibers, carbon fibers, stainless steel fibers, copper fibers, amorphous metal fibers using a fiber reinforced polymer strip Method of making geogrids. The method according to claim 1, wherein the sum of the cross sectional areas of the reinforcing fibers is 20 to 80% of the total cross sectional area of the radial and upward strips. The method of manufacturing a geogrid using a fiber-reinforced polymer strip according to claim 1, wherein the number of the fiber-reinforced polymer strips produced by continuous coextrusion is 10 to 40. The geogrid of claim 1, wherein the radial and upward strips have a cross section of a rectangular shape having a width of 1 to 20 mm, a thickness of 1 to 5 mm, or a circular shape having a diameter of 1 to 10 mm. Manufacturing method. The method of claim 1, wherein the spacing between the centers of the radial strips is 5 to 100 mm and the spacing between the centers of the upward strips is 10 to 100 mm. The method according to claim 1, wherein the upward direction is supplied from the upward strip so that the upward strip makes an angle of 80 to 100 ° with respect to the radial strip. A method of producing a geogrid using a fiber-reinforced polymer strip, characterized in that the width of the geogrid to be produced according to claim 1 is 1 ~ 5m. A geogrid using a fiber reinforced polymer strip, characterized in that lattice-bonded radial and upward fiber reinforced polymer strips prepared by co-extrusion of polymer resin and reinforcing fibers. The polymer resin of claim 13 is a polyolefin resin having a melt index (MI) of 1 to 60 g / 10 minutes, polyethylene terephthalate (PET), polyamides (polyamides), having an intrinsic viscosity (IV) of 0.64 to 1.0, It is selected from the group consisting of polyacrylates, polyacrylonitrile, polycarbonates, polyvinylchloride (PVC), polystyrene, polybutadiene (polybutadiene) Geogrid using fiber reinforced polymer strip. 14. The geogrid using fiber reinforced polymer strips according to claim 13, wherein the reinforcing fibers are selected from the group consisting of polyester high strength yarns, glass fibers, aramid fibers, carbon fibers, stainless steel fibers, copper fibers, and amorphous metal fibers. . The geogrid using a fiber-reinforced polymer strip according to claim 13, wherein the sum of the cross-sectional areas of the reinforcing fibers is 20 to 80% of the sum of the total cross-sectional area of the light and reinforcing fiber-reinforced polymer strips. The fiber-reinforced polymer strip according to claim 13, wherein the radially and upwardly fiber-reinforced polymer strips have a cross section of a circular shape having a width of 1 to 20 mm, a thickness of 1 to 5 mm, or a circular shape of 1 to 10 mm in diameter. Geogrid with The geogrid according to claim 13, wherein the distance between the centers of the radial strips is 5 to 100 mm and the distance between the centers of the upward strips is 10 to 100 mm.

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