KR101879347B1 - A geogrid having super absorbable non-woven fabric for reinforcing asphalt road surface, the method for producing the geogrid, and the method for repairing and reinforcing the asphalt road by using the geogrid - Google Patents

Abstract

The present invention relates to a geogrid including a super absorbent non-woven fabric to reinforce an asphalt road, capable of quickly completing asphalt cladding and compacting works. According to the present invention, the geogrid including a super absorbent non-woven fabric to reinforce an asphalt road comprises: a fiber lattice network (2) made by coupling a plurality of vertical fiber ribs (10) arranged in a first direction and a plurality of horizontal fiber ribs (20) arranged in a second direction perpendicular to the first direction in a lattice shape; a plurality of lattice holes (31) formed in an area of the fiber lattice net (2) by making the vertical and horizontal fiber ribs (10, 20) included in the fiber lattice net (2) spaced apart from the different vertical and horizontal fiber ribs (10, 20) adjacent thereto; an asphalt and polymer resin coating layer (41) formed on a surface of the fiber lattice net (2) by a thickness of 10 to 500 μm by immersing the fibers forming the fiber lattice net (2) in an emulsion of an asphalt and polymer resin material; silica powder (4) attached on a coating layer (41), formed on a surface of the fiber lattice net (2), to cover at least one surface of the fiber lattice net (2); and a non-woven fabric (3) coupled to one surface of the fiber lattice net (4). Parts (30) in which the vertical and horizontal fiber ribs (10, 20) are met and intersected with each other are surrounded and bound by a thin fiber (35), thereby fixing a shape of the fiber lattice net (2).

Description

Technical Field [0001] The present invention relates to a geogrid for reinforcing an asphalt road including a high-absorptive nonwoven fabric, a method for manufacturing the same, and a method for repairing and reinforcing an asphalt road using a geogrid for reinforcing an asphalt road the geogrid, and the method for repairing and reinforcing the asphalt road by using the geogrid}

The present invention relates to a geogrid for reinforcing an asphalt road including a superabsorbent nonwoven fabric, a method for manufacturing the same, and a method for reinforcing asphalt road maintenance using a geogrid for reinforcing an asphalt road. More particularly, the present invention relates to a method for repairing asphalt roads damaged by cracks, potholes, · When tack coat is applied to secure adhesion between old and new pavement after removing existing old asphalt pavement for reinforcement, it is possible to absorb water in tack coating liquid in a short time and to complete the asphalt pavement construction early The present invention relates to a method of reinforcing an asphalt road using a geogrid for reinforcing an asphalt road.

Roads that pass through the vehicle are packed in asphalt concrete or cement concrete. All road pavements, whether in asbestos or cement concrete pavements, are subject to repeated structural damage due to repeated traffic loads and temperature changes, Lt; / RTI > Traffic loads generated on the roads continuously traveling cause the tensile stress and the shear stress at the lower part of the pavement layer to generate internal cracks and cracks generated in the lower part of the pavement are transferred to the surface layer, ).

Also, when the temperature change of the four seasons is extreme, like in Korea, it is affected by the difference of the stress due to the temperature gradient induced in the depth direction on the cross section of the road when exposed to extreme temperature conditions, The appearance of cracks is also a major cause of road breakage. Vehicle load at high temperature in summer may cause structural failure of pavement due to rutting of pavement surface of pavement on road. In recent years, due to recurrence of rainy season heavy rain due to climate change, and asphalt damage such as the occurrence of potholes. In addition, infiltration of calcium chloride, which is sprayed to remove frost, sea ice, and freezing of winter season, causes vertical or vertical deformation on the pavement surface, causing cracking and breakage of the asphalt. In some cases, the driving performance of the vehicle deteriorates and, in severe cases, it can pose a serious risk to vehicle damage and the safety of the driver.

On the other hand, asphalt concrete (ascon) pavement, which is mainly used for road pavement, has a relatively short construction period and can be formed evenly on the pavement surface, which makes it possible to travel at a high speed and has a good ride quality. There is a problem in that the fatigue load easily causes denting or cracking. For this reason, the Ascon paved road has been under construction for several years, and partial damage is still occurring. As a result, it has been necessary to repair the road frequently, It is easy to find scenes where some traffic is intercepted and maintenance work is carried out.

Compared with Ascon pavement, cement concrete pavement has a long curing time, high construction cost, and complicated processes such as joint installation, but it is applied mainly to highways because of its good adaptability to middle vehicles and long service life . However, if the cracks are caused by the traffic load and the temperature load due to the frequent passage of vehicles during the passage of more than several tens of tons, the damage of the pavement surface can not be avoided. If the cement concrete pavement in use is being repaired, Because it is virtually impossible to restrain for a long time, unlike the case of the first construction, it is necessary to overhaul the damaged part by using the method of Ascon packaging. In other words, repairing of the damaged part of the road, whether it is the ascon pavement or the cement concrete pavement, is carried out by using the ascon.

In the method of repairing cracked and broken roads, it is possible to cut the damaged portion and cover it with a new ascon. However, recently, in order to increase the rigidity and the supporting force of the broken portion, It is becoming common practice to lay a grid-like civil engineering fiber reinforcement on the exposed floor and to lay up the surface of the ascon.

Korean Unexamined Patent Publication No. 10-2005-0102469 (published on October 26, 2005) discloses a method of reinforcing asphalt asphalt and a method of reinforcing asphalt using the same, wherein the lattice net made of glass fiber and the lattice net And a low melting point resin film layer adhered to the other surface of the asphalt coating layer. In the asphalt reinforcement material of the present invention, The reinforcement method is as follows: The asphalt reinforcement composed of the glass fiber lattice network, the coating layer, the sanding layer and the resin film layer is rolled and stored in a roll, and unrolled during the asphalt reinforcement work. So that the formed film layer was used for combustion. In the above patent, since a fiber reinforcing material is manufactured by impregnating a sticky resin in order to prevent the glass fiber yarn from being disturbed, a releasing paper has to be used for winding and storing the fiber reinforcing material. In addition, So that the film layer was burned off using a gas torch in the unrolling device.

A number of similar technologies have been proposed in the related art in addition to the above patent applications. In the related art, a coating layer is formed by asphalt impregnation in a lattice net made of glass fiber yarns or synthetic resin yarns, and a resin film layer is adhered to prevent the impregnated asphalt coating layers from sticking to each other There was a common point in that it made a reinforcing material for civil engineering fiber (called "geogrids") and that the resin film layer was removed by burning with a gas torch when used in the field and then installed on the floor.

However, the burning of the resin film layer by the flame of the gas torch not only causes environmental pollution, but also poses a serious problem in terms of safety because it is necessary to deal with the fire in the work site. In addition, there is a problem that the reinforcement is pressed or torn on the wheels of the vehicle frequently, and the process of removing the stiffener is repeated several times. If the stiffener is overlapped or twisted incorrectly, the pavement of the old pavement surface and the asphalt pavement layer is interfered rather than the existing pavement surface.

The tack coating must first be applied to the basement or middle layer exposed to the surface of the road and then to the surface of the new ascon to bond it again. The tack coating is used to remove asphalt, bitumen or pitch from the oil refining process, Is mixed with water and roots on the bottom of the road. The asphalt emulsion used in tack coating can be said to be a water-oil blender. According to the standard road maintenance manual, after the tack coating has been sufficiently cured, that is, after the water in the tack coating has been sufficiently dried, have.

Generally, it takes about 2-3 hours in summer to dry out due to the evaporation of water in the tack coat sprayed on the road maintenance site. In the event of traffic congestion, In fact, it is difficult to install the fiber reinforcing material on the site before the water is almost completely dried after the tack coating. If the surface of the ascon is covered with the water in the tack coating, the surface of the surface tends to be lifted due to a lack of adhesion between the old and new tacky layers.

As described above, in the case of carrying out the road maintenance reinforcement work using the existing civil fiber reinforcing material, the lack of adhesive force of the interface between the old and new packaging due to moisture remaining in the tack coating solution causes the tacking of the reinforcing material and separation of the old and new pavement layers, There is a problem that cracks such as premature fatigue cracks, plastic deformation, and potholes occur again in the section.

In order to solve the above-mentioned problems, the present invention provides a method for rapidly absorbing moisture contained in a tack coating applied on a floor surface of a asphalt road using a special nonwoven fabric produced by meltblown composite spinning, The present invention has as its object to provide a geogrid for reinforcing an asphalt road and a method of manufacturing the geogrid including a high-absorptive nonwoven fabric capable of promptly curing and consequently completing the asphalt overlay work and the compaction work after the installation of the geogrids .

In addition, the present invention uses a material having excellent durability and rigidity such as glass fiber, carbon fiber, aramid fiber, polyamide fiber, and bazaar fiber as a material of a fiber grating mesh of a geogrid, The present invention provides a geogrid for reinforcing an asphalt road including a high absorptive nonwoven fabric capable of suppressing shear behavior and plastic behavior of the surface layer of an asphalt by optimizing it according to actual road construction conditions and a manufacturing method thereof.

The present invention also relates to a method of repairing and reinforcing asphalt roads using a geogrid for reinforcing asphalt roads, which comprises a high-absorptive nonwoven fabric that allows early completion of subsequent work after tack coating using a geogrid employing a meltblown composite radial nonwoven fabric The purpose is to provide.

In order to achieve the above object, the geogrid for reinforcing asphalt roads including the superabsorbent nonwoven fabric provided by the present invention comprises a plurality of longitudinal fiber ribs (10) arranged in a first direction and a plurality of longitudinally- A fiber lattice net 2 made by joining a plurality of transverse fiber ribs 20 arranged in two directions in a lattice form; The longitudinal fiber ribs 10 and the transverse fiber ribs 20 contained in the fiber grille net 2 are spaced apart from the adjacent longitudinal fiber ribs 10 and the transverse fiber ribs 20, A plurality of grid holes (31) formed in the region of the fiber grille (2) by being spaced apart; The fibers constituting the fibrous mesh network 31 are impregnated with an emulsion of asphalt and a polymer resin material to form a coating layer 41 made of asphalt and polymer resin and formed to a thickness of 10 to 500 탆 on the surface of the fibrous mesh network 2, ; Silica powders (4) covering at least one surface of the fiber grille net (2) by being attached to a coating layer (41) formed on the surface of the fiber grating net (2); And a nonwoven fabric (3) bonded to one surface of the fiber grating net (4), wherein portions (30) where the longitudinal fiber ribs (10) and the transverse fiber ribs (20) Wherein the shape of the fiber grille net (2) is fixed by being surrounded and bound by fine fiber (35), the longitudinal fiber rib (10) is composed of two to four fiber yarns, and the transverse fiber rib ) Is composed of one to four fiber yarns, and the fiber yarn is composed of glass fiber, carbon fiber, aramid fiber, acrylic fiber, polyamide fiber, polyester fiber, polypropylene fiber, , And one fiber yarn is composed of 100 to 4,000 fiber filaments.

In order to attain the above object, the geogrid for reinforcing an asphalt road including the superabsorbent nonwoven fabric provided by the present invention is characterized in that the width of the longitudinal and transverse fiber ribs (10, 20) is 2 to 7 mm, The hole 31 has a rectangular shape with a length of 10 to 30 mm and a ratio of the total area of the grid holes 31 to the total area of the geogrid 1 is 50 to 70% .

In order to achieve the above object, the geogrid for reinforcing an asphalt road including the superabsorbent nonwoven fabric provided by the present invention is characterized in that at least one of the longitudinal fiber ribs 10 and the transverse fiber ribs 20 is made of glass fiber Wherein the glass fiber filament has a thickness of 16.5 to 17.5 μm and the water content is 0.01 to 0.03% by weight of the glass fiber filament, and 1,000 to 4,000 glass fiber filaments are integrated to form one fiber , The number of tex is 1,100 to 1,300 g / km, the tensile strength of one glass fiber yarn is 1,200 to 1,300 MPa, and the elastic modulus is 122,000 to 126,000 MPa.

In order to accomplish the above object, in the geogrid for asphalt road reinforcement including the superabsorbent nonwoven fabric provided by the present invention, the nonwoven fabric (3) is formed by integrating the fiber filaments produced by the meltblown composite spinning device (200) And the cross-sectional shape of the fiber filaments in the radial direction is a sheath-core type or a side by side type and is formed by extruding the extruded fibers 2 The two polymer materials appear as bounded regions in the radial cross-sectional structure of the filament filament by being merged and radiated into one at the nozzle part 232 of the radiator 230, The thickness of the nonwoven fabric 3 is 1 to 10 μm, and the basis weight of the nonwoven fabric 3 is 25 to 400 g / m 2.

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In order to accomplish the above object, the present invention provides a method of manufacturing a geogrid for reinforcing asphalt roads comprising a superabsorbent nonwoven fabric provided with a plurality of longitudinal fiber ribs arranged in a first direction, (2) by disposing a plurality of transverse fiber ribs (20) in a second direction intersecting at right angles to the first direction; A second coating layer 41 made of asphalt and polymer resin having a thickness of 10 to 200 탆 is formed on the surface of the fiber grille net 2 by impregnating the fiber grating net 2 with a coating liquid composed of asphalt and a polymer resin emulsion, step; A third step of attaching the silica sand powders 4 to the surface of the fiber grille net 2 by attaching the silica sand powders 4 to the surface of the fiber grill net 2 to bond the silica sand powders 4 onto the asphalt resin coating layer 41; A fourth step of applying an adhesive to the bottom surface of the fiber grille net 2; And a fifth step of attaching the nonwoven fabric 3 to the bottom surface of the fiber grille net 2. The longitudinal fiber ribs 10 and the transverse fiber ribs 20 Are spaced from each other from adjacent ones of the adjacent longitudinal fiber ribs and transverse fiber ribs, a plurality of grid holes (31) are formed in the region of the fiber grille net (2) The directional fiber rib 10 is composed of two to four fiber yarns and the transverse fiber rib 20 is composed of one to four fiber yarns and the first step is performed by using the loom 103 The loom 103 is capable of performing a sewing operation comprising wrapping and binding the intersecting portions 30 of the longitudinal fiber ribs 10 and the transverse fiber ribs 20 with the binding fine fiber yarns 35 And the fiber yarns constituting the longitudinal fiber ribs 10 and the transverse fiber ribs 20 are glass fibers, carbon And is any one of fibers selected from the group consisting of fibers, aramid fibers, acrylic fibers, polyamide fibers, polyester fibers, polypropylene fibers, and bar-cut fibers.

In order to accomplish the above object, the present invention provides a method of repairing and reinforcing asphalt using geogrid for asphalt road reinforcement including a superabsorbent nonwoven fabric provided by the present invention, comprising the steps of: (a) providing a pothole, A first step of crushing, cutting and removing the surface layer of the road 7c with respect to the area to be reinforced including the part where the breakage has occurred; (b) a second step of cleaning the asbestos base layer 6 or the intermediate layer exposed by the operation of the first step by using high-pressure air and arranging the bottom surface flat; (c) performing a tack coat (5) by applying an asphalt emulsion on the bottom surface using a distributor; (d) placing the geogrid 1 integrated with the superabsorbent nonwoven fabric on the bottom surface of the tack coat 5 so as to allow the moisture in the tack coat to be absorbed into the superabsorbent nonwoven fabric within 5 to 20 minutes, ; And (e) placing an asphalt mixture on the geogrid (1) and performing compaction to form an aspheric surface layer (7), wherein the asphalt mixture is a mixture of asphalt and aggregate, So as to maintain the temperature.

The geogrid for reinforcing the asphalt road including the high absorptive nonwoven fabric according to the present invention can absorb the moisture contained in the tack coating on the bottom surface of the asphalt road by a special nonwoven fabric made by meltblown composite spinning, As a result of reducing the curing time of the tack coating, it is possible to complete the installation and compaction of the surface of Ascon after the installation of geogrids at the road maintenance reinforcement site, And it is possible to maximize the bonding force between the surface layer and the base layer by making the tack coating performance 100%.

In addition, the geogrid according to the present invention can prevent delamination by perfectly bonding the aspheric surface layer with the lattice net made of a fiber material having high rigidity such as glass fiber and bar-suit fiber through the impregnated asphalt resin coating layer, Since the aggregates of the surface layer are sandwiched between the holes of the fiber mesh network, it is possible to prevent the aggregate from moving even by the repeated load of the vehicle, thereby greatly suppressing the plastic deformation of the repaired road.

型, core-sheath type) 또는 사이드 바이 사이드(side by side) 형과 같은 이중구조의 단면 형태를 갖게끔 멜트블로운 부직포를 제조하는 장치(200)의 개략적인 구성도이다.
도12는 도11에 도시된 멜트블로운 복합방사 부직포 제조 장치(200)에 있어서 노즐관체(231)의 직경방향 단면구조에 관한 일 예를 도시한 것으로서, 노즐관체(231)의 내부에 일자형 분리벽(231a)이 설치되어 노즐관체(231) 속의 용융수지 이동통로가 2개의 구획(261, 262)으로 나누어져 있고, 그 각각의 구분된 공간들로 제1압출 용융수지(211b) 및 제2압출 용융수지(221b)가 각각 투입될 수 있도록 구성된 점이 나타나 있다.
도13은 도12에 도시된 노즐관체(231)에 의해 생산된 멜트블로운 복합방사 섬유 필라멘트(234)의 굵기방향 단면도로서 사이드 바이 사이드형(side by side type)의 단면 구조가 나타나 있다.
도14는 도11에 도시된 멜트블로운 복합방사 부직포 제조 장치(200)에 있어서 노즐관체(231)의 직경방향 단면구조에 관한 다른 예를 도시한 것으로, 노즐관체(231)의 내부에 원통형 분리벽(231b)이 설치되어 용융수지 이동통로가 2개의 구획(263, 264)으로 나누어져 있고, 그 각각의 구분된 공간들로 제1압출 용융수지(211b) 및 제2압출 용융수지(221b)가 각각 투입될 수 있도록 구성된 점이 나타나 있다.
도15는 도14에 도시된 노즐관체(231)에 의해 생산된 멜트블로운 복합방사 섬유 필라멘트(234)의 굵기방향 단면도로서 심초형(core-sheath type)의 단면구조가 나타나 있다.
도16은 스펀본드 복합방사 부직포 제조장치(300)의 개략적인 구성도로서, 도1에 도시된 본 발명에 따른 아스팔트 도로 보강용 지오그리드(1)에 포함되는 고흡수성 부직포(3)가 여러 겹의 부직포들로 이루어진 경우, 그 다층 구조 중의 적어도 하나의 층을 이루는 스펀본드 부직포를 제조하는 공정을 설명하는 도면으로서, 특히 스펀본드 부직포를 구성하는 각각의 섬유 필라멘트가 심초형 또는 사이드 바이 사이드 형과 같은 이중 구조의 단면 형태를 가진 스펀본드 부직포를 제조하는 장치를 도시한다.
도17은 도11에 도시된 멜트블로운 복합방사 부직포 제조장치(200) 및 도16에 도시된 스펀본드 복합방사 부직포 제조장치(300)에 의해 각각 생산된 멜트블로운 부직포와 스펀본드 부직포들을 적층하여 하나로 합하는 부직포 합지장치(400)의 개략적인 공정 구성도이다.
도18은 본 발명에 따른 고흡수성 부직포를 포함한 아스팔트 도로 보강용 지오그리드를 이용한 도로 보수공법의 작업진행 순서도이다.
도19 및 도20은 본 발명에 따른 고흡수성 부직포를 포함한 아스팔트 도로 보강용 지오그리드를 사용하여 아스팔트 도로를 보수하는 상태를 도시한다.
도21은 도19 및 도20에 도시된 작업과정을 거쳐 아스팔트 도로(7c)의 재포장이 완료된 후의 도로 단면도이다.
도22는 본 발명에 따른 고흡수성 부직포를 포함한 아스팔트 도로 보강용 지오그리드를 사용해 아스팔트 도로의 보수·보강 공정을 완료했을 경우의 아스팔트 도로(7c)의 단면도로서, 택코팅(5) 중에 존재하는 수분을 지오그리드(1)의 부직포(3)가 빨리 그리고 완전히 흡수함으로써 지오그리드(1)의 상부에 새로 포장된 아스콘 표층(7)이 지오그리드 하부에 있는 기존 아스콘 기층(6)과 일체로 단단히 결합하게 되는 것을 보인다. 1 is a perspective view of a geogrid 1 for reinforcing an asphalt road including a superabsorbent nonwoven fabric according to the present invention.
FIG. 2 shows a geogrid 1 for reinforcing an asphalt road including the superabsorbent nonwoven fabric shown in FIG. 1 and an asbestos base layer 6 having an upper tack coating applied thereto. And can be laid out on the tack coat layer 5 of the substrate.
3 is an exploded perspective view of the asphalt road reinforcing geogrid 1 shown in Fig. 1, showing the relation that the nonwoven fabric 3 is bonded to the underside of the fiber lattice 2 made of a fiber material such as glass fiber.
4 is an enlarged view of the portion C of the fiber grille net 2 shown in FIG. 3, wherein the intersecting portions 30 where the longitudinal fiber ribs 10 and the transverse fiber ribs 20 meet, And is fixed by being bundled and fixed by the fibers (35).
5 is a sectional view of the 'A' portion of the asphalt road reinforcement geogrid 1 shown in FIG. 1, and FIG. 6 is a sectional view taken along line BB of FIG.
7 is a schematic overall configuration diagram of a system 100 for manufacturing a geogrid 1 for asphalt road reinforcement including a superabsorbent nonwoven fabric according to the present invention.
FIG. 8 is a table summarizing the components and composition ratios of the coating liquid composition coated on the fiber grille net 2 of the geogrid 1 for asphalt road reinforcement according to the present invention, FIG. 10 is a table summarizing the composition ratios of all the components of the coating liquid composition shown in FIG. 8. FIG. 10 is a table summarizing the composition ratios of the asphaltic resin emulsion as two components.
Fig. 11 is a process diagram of a manufacturing apparatus for a superabsorbent nonwoven fabric 3 included in the geogrid 1 for reinforcing asphalt roads according to the present invention. In particular, each of the fibrous filaments constituting the nonwoven fabric is co- Mold

(200) for producing a meltblown nonwoven fabric having a cross-sectional shape of a double structure such as a core-sheath type or a side by side type.
12 shows an example of the cross-sectional structure in the radial direction of the nozzle tube 231 in the meltblown composite spinning nonwoven fabric manufacturing apparatus 200 shown in FIG. 11, in which the tube tube 231 has a straight- The molten resin transfer path in the nozzle tube body 231 is divided into two sections 261 and 262 by providing a wall 231a and the first extruded molten resin 211b and the second extruded molten resin And the extruded molten resin 221b can be respectively put into the mold.
FIG. 13 is a cross-sectional view of the meltblown composite fiber filament 234 produced by the nozzle tube 231 shown in FIG. 12 in a thickness direction, and shows a cross-sectional structure of a side by side type.
14 shows another example of the cross-sectional structure in the radial direction of the nozzle tube 231 in the meltblown composite spinning nonwoven fabric manufacturing apparatus 200 shown in Fig. 11. In the nozzle tube 231, The molten resin transfer passage is divided into two sections 263 and 264 by providing a wall 231b and the first extruded molten resin 211b and the second extruded molten resin 221b are divided into the divided spaces, Respectively, are shown.
FIG. 15 is a cross-sectional view of the meltblown composite fiber filament 234 produced by the nozzle tube 231 shown in FIG. 14 in a thickness direction, and shows a cross-sectional structure of a core-sheath type.
16 is a schematic structural view of a spun bond composite spinning nonwoven fabric manufacturing apparatus 300. As shown in FIG. 1, the high-absorptive nonwoven fabric 3 included in the geogrid 1 for asphalt road reinforcement according to the present invention shown in FIG. The present invention relates to a process for producing a spunbonded nonwoven fabric constituting at least one layer of the multi-layered structure in the case of nonwoven fabrics. In particular, the respective filament filaments constituting the spunbonded nonwoven fabric are classified into FIG. 2 shows an apparatus for producing a spunbonded nonwoven fabric having a cross-sectional configuration of a double structure.
17 is a cross-sectional view of a meltblown composite nonwoven fabric manufacturing apparatus 200 shown in Fig. 11 and meltblown nonwoven fabrics and spunbond nonwoven fabrics respectively produced by the spunbond composite nonwoven fabric manufacturing apparatus 300 shown in Fig. 16, A nonwoven fabric lapping apparatus 400 according to an embodiment of the present invention.
18 is a flowchart showing the operation of the road maintenance method using the geogrid for reinforcing asphalt roads including the superabsorbent nonwoven fabric according to the present invention.
19 and 20 show a state of repairing an asphalt road using a geogrid for reinforcing an asphalt road including a superabsorbent nonwoven fabric according to the present invention.
21 is a road sectional view after the asphalt road 7c has been repacked through the work process shown in Figs. 19 and 20. Fig.
22 is a cross-sectional view of the asphalt road 7c when the asphalt road repair and reinforcement process is completed using the geogrid for reinforcing the asphalt road including the superabsorbent nonwoven fabric according to the present invention. The nonwoven fabric 3 of the geogrids 1 quickly and completely absorbs and shows that the newly packaged asconic surface layer 7 on the top of the geogrid 1 is tightly integrated with the existing asconic base layer 6 located below the geogrid 1 .

Hereinafter, a geogrid for reinforcing an asphalt road including a superabsorbent nonwoven fabric according to the present invention, a method of manufacturing the same, and a construction and effect of an asphalt repair reinforcement construction method using the geogrid for reinforcing an asphalt road will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a geogrid 1 for reinforcing an asphalt road including a superabsorbent nonwoven fabric according to the present invention. 1, the road-reinforcing geogrid 1 according to the present invention comprises a plurality of fiber ribs 10 and 20 arranged in a longitudinal direction and a transverse direction to form a fiber grid 2, A nonwoven fabric (3) is attached to the bottom of the fiber grille net (2).

The longitudinal fiber ribs 10 and the transverse fiber ribs 20 may each be composed of one or a plurality of patterns. According to FIG. 1, The transverse fiber ribs 20 are composed of two patterns of a first type fiber yarn 11 and a second longitudinal fiber yarn 12 and the transverse fiber ribs 20 are made of one transverse fiber yarn 21. The transverse fiber yarn 21 may be woven to be sandwiched between the first and second directional fiber yarns 11 and 12 or may be formed by simply weaving the first and second directional fiber yarns 11 And 12, the transverse fiber yarn 21 may be placed on the upper side.

On the other hand, the geogrid 1 for reinforcing asphalt roads shown in Fig. 1 is arranged in such a manner that two longitudinal strand fibers 11, 12 and one strand of transverse fiber yarns 21 intersect at right angles, The bundled fine fiber yarns 35 (see FIG. 4) are bound together in a lattice shape by sewing and wrapping the longitudinal fiber yarns 11, 12 and the transverse fiber yarns 21 together. That is, the binding fine fiber yarns 35 bind the crossing portions 30 where the first and second direction fiber yarns 11 and 12 and the transverse fiber yarns 21 meet to form the transverse fiber ribs 10, Direction fiber ribs 20 to maintain a lattice shape.

The fibrous mesh net 2 made in the form of a checkerboard lattice by the longitudinal fiber ribs 10, the transverse fiber ribs 20 and the bundled fine filament fibers 35 is made of a coating liquid prepared by blending asphalt and high polymer synthetic resin And the asphalt resin coating layer 41 (see Figs. 5 and 6) is formed on the surface thereof by impregnation treatment. At this time, the thickness of the coating layer is preferably 10 to 500 mu m.

In the road reinforcement geogrid 1 according to the present invention, silica sand powder of fine particles may be sprayed onto the surface of the asphalt resin coating layer 41 impregnated in the fiber grid 2, The silica sand powder adhering to the surface of the asphalt resin coating layer 41 relaxes the sticky property of the asphalt resin coating layer 41 itself, thereby increasing the convenience of handling and storage such as winding the geogrids in a roll form.

On the other hand, since the geogrid 1 according to the present invention is in contact with asphalt having a high temperature ranging from 150 to 180 ° C. in the asphalt pavement, the fiber lattice 2 of the geogrid 1 can withstand such high temperatures It is necessary to use a material having heat resistance as high as

For this purpose, the fiber cloth used for constructing the fiber grating net 2 in the present invention may be any of fiberglass, carbon fiber, aramid fiber, acrylic fiber, polyamide fiber, polyester fiber, polypropylene fiber, Fiber yarns made of one material can be used.

Among the fibers of various materials as described above, it is glass fiber that can be most widely used as the fibers constituting the grid grid 2 of the geogrid according to the present invention. The glass fiber is a long fiber drawn by drawing a molten glass at a high speed and melting the glass raw material at a temperature of about 1,600 ° C. and then connecting 100 to 4,000 filaments with a binder to form a fiber yarn.

The carbon fiber is a very thin fiber having a thickness of 0.005 to 0.01 mm, which is a main component of carbon, and a single strand of carbon fiber yarn is made by twisting thousands of strands of carbon fiber. Carbon fibers are characterized by high tensile strength, light weight, low thermal expansion rate, but they are very expensive.

Basalt fiber is an inorganic fiber made of filament of 9 ~ 20㎛ diameter by spinning basalt or volcanic rock at 1,500 ℃ using centrifugal force. It is widely used for industrial use Is a fiber. Basalt fibers are superior to other inorganic fibers in terms of fire retardancy, heat insulation, heat resistance, soundproofing, sound absorption, moisture absorption, abrasion resistance, erosion resistance and corrosion resistance, and light weight and high strength. The color of the basalt fiber is similar to that of carbon fiber and the quality is similar to that of glass fiber. It is preferable to use a silane-coated surface of the basalt fiber.

Hereinafter, the configuration of the present invention will be further described with preference as an example in which the fiber grid network 2 of the geogrid 1 for asphalt road reinforcement of the present invention is formed of glass fiber for convenience.

When the grid of the road reinforcing geogrid 1 shown in Fig. 1 is made of glass fiber, one of the longitudinal fiber yarns 11, 12 and the transverse fiber yarn 21 itself has 1,000 to 4,000 fine The glass fiber filaments may be integrated and bundled, and each glass fiber filament may have a diameter or thickness of 16.5 to 17.5 탆 and a water content of 0.01 to 0.03% by weight based on the weight of the entire glass fiber filament . In addition, it is advantageous that the number of the longitudinal fiber yarns 11, 12 and the lateral fiber yarn 21 made of glass fibers is 1,100 to 1,300 g / km. In this case, The tensile strength is 1,200 to 1,300 MPa and the elastic modulus is 122,000 to 126,000 MPa.

Thus, for example, as shown in FIG. 1, the longitudinal fiber rib 10 is composed of two fibrous yarns, namely a first longitudinal fiber yarn 11 and a second longitudinal fiber yarn 12, In the case of using a fiber material, the number of texes of the longitudinal fiber ribs 10 is twice to 2,200 to 2,600 g / km, and the tensile strength and the elastic modulus are doubled 2,400 to 2,600 MPa and 244,000 to 252,000 MPa. Here, the number of fibers (tex) is a unit representing the fineness of the fibers, expressed as the weight of the fibers per unit length.

On the other hand, if the tensile strength and the elastic modulus of the geogrid are required to be higher due to design considerations depending on the field conditions of roads requiring repair and reinforcement, the number of glass fibers (longitudinal) of the longitudinal fiber ribs 10 and the lateral It is possible to sufficiently exhibit the required rigidity and support force in the road pavement layer by further increasing the number of glass fibers of the directional fiber rib 20. [

As described above, in the present invention, the number of glass fibers constituting the longitudinal fiber ribs 10 and the lateral fiber ribs 20 of the fiber grille net 2 can be changed according to the required use and the designed support load, According to the results of a number of field experiments conducted by the present inventors on the premise that the 'longitudinal direction' refers to the traveling direction of the road and the 'lateral direction' means the road width direction, the longitudinal fiber ribs 10 have 2 to 4 And the transverse fiber ribs 20 are preferably composed of one to four glass fiber yarns.

Fig. 2 shows that the geogrid 1 for asphalt road reinforcement including the superabsorbent nonwoven fabric shown in Fig. 1 can be installed in a manner spread on the tacky-coated asbestos base layer 6. Fig.

For reference, the cross-sectional structure of the road pavement is briefly described. First, when the asphalt concrete pavement is installed on the main roads such as the expressway and the national road, the road bed made of the earth is located at the bottom, A base layer made of a mixture of asphalt and aggregate is installed on the auxiliary layer at a thickness of about 20 cm and a mixture of asphalt and aggregate And has a cross-sectional structure in which an intermediate layer and a surface layer are formed.

On the other hand, in the case of the local roads and the general city roads, the cross-sectional structure is simplified rather than the case of the expressway, and the middle layer is omitted, and the tack coat is applied directly on the ascon base layer. In this case, a prime coating or a tack coating is performed using a bituminous material to ensure a bonding force between the different layers. The prime coating is performed between the base layer and the base layer and between the base layer and the intermediate layer. Between the surface layers.

However, in the case of road pavement, portholes and cracks, which are partially completed on the road under construction, it is necessary to remove the surface layer of the ascon, Later, it is often the case that the surface of the ascon is repacked by installing the ascon.

The road 70 shown in FIG. 2 is obtained by removing the aspheric surface layer, which is the uppermost layer of the road pavement structure, from the bottom surface in which the aspheric substrate 6 or the intermediate layer is exposed, and the tack coating 5 on the bottom surface State.

The tack coating is an asphalt emulsion or emulsified asphalt that helps to adhere the two layers between the already existing asconic or intermediate layer and the further applied ascon surface layer. Means the asphalt is dispersed in the water by making the asphalt finely so that it can be used at room temperature without heating the solid or semi-solid asphalt. At this time, since water and asphalt are not mixed with each other by themselves, an emulsifier is added and ground at a high speed to disperse asphalt particles evenly in water to make emulsified asphalt. Most of the asphalt particles in the emulsion asphalt used in the tack coating are in the range of 1 to 5 μm in diameter, and the added emulsifier acts to charge the surface of the asphalt particles to prevent the particles from sticking to each other.

The reason for using asphalt emulsion mixed with water with tack coating is because the asphalt itself is too viscous and it is difficult to spray by a distributor (also called distributor). In other words, tack coating is an operation of spraying asphalt emulsion with a lot of water on the surface of the bottom surface such as the base layer or the middle layer.

As in the case of FIG. 2, the tack coat (5) sprayed on the ascon base layer (6) or the intermediate layer contains more than 50% of water, so that only after the water is mostly evaporated, the hardening action of the asphalt emulsion is made, And the like. If the geogrids (1) and the surface layer of the ascones are applied in a state where the moisture contained in the tack coating solution is left as it is, the adhesion between the surface layer and the base layer is not completely achieved due to the moisture remaining between the surface layer and the as- As a result, the surface is flooded and the repair work is revealed.

In the case of the geogrid 1 for reinforcing asphalt roads according to the present invention, since the nonwoven fabric 3 attached to the lower side of the fiber grating net 2 is a special nonwoven fabric produced by the meltblown composite spinning method, So that the nonwoven fabric 3 can quickly and completely absorb the moisture in the tack coat 5 so that the tack coating can be hardened quickly and as a result the surface layer of asbestos can be rapidly applied There are advantages.

In general, as for the ordering agency and the field installer who are in charge of repairing the road, the basic task is to repair the road completely, and the problem of traffic congestion due to the blockage of the road due to the repair work and the complaints and complaints of the driver There is a considerable burden between the opposing demands to minimize. For this reason, the site repair worker frequently hits the surface of Ascon in a hurry without waiting for the tack coating to cure sufficiently. In such a case, it is highly likely that the repair work will fail.

However, the geogrid 1 for reinforcing asphalt roads according to the present invention can quickly and efficiently absorb moisture in the tack coat 5 and the asphalt component in the tack coat can be sufficiently cured, It is possible not only to minimize the inconvenience of the citizens due to traffic interruption by shortening the repair work time but also to improve the completeness of repair work by ensuring sufficient bonding force between the surface layer and the base layer of the ascon.

2, reference numeral 31 denotes a lattice hole existing between the longitudinal ribs 10 and the lateral ribs 20 of the fiber lattice net 2, and reference numeral 5a denotes a tack coat 5, .

Fig. 3 is an exploded perspective view of the asphalt road reinforcing geogrid 1 shown in Fig. 1, showing the relationship in which the nonwoven fabric 3 is bonded to the underside of the fiber grille net 2. Fig. According to a simple definition of ASTM relating to a nonwoven fabric, a " sheet formed by bonding between a fibrous layer (web) and a fiber " is called a nonwoven fabric. Specifically, a sheet made of fibers made by friction, May be referred to as a nonwoven fabric.

型) 혹은 사이드 바이 사이드(side by side)형의 이중 단면구조를 가진 부직포일 수 있고, 또는 멜트블로운 복합방사 방식과 스펀본드(spunbond) 복합방사 방식에 의해 만들어진 멜트블로운 복합방사 부직포와 스펀본드 복합방사 부직포를 여러 겹 겹쳐서 만든 다층구조의 부직포일 수도 있다. The nonwoven fabric (3) employed in the present invention is produced by a meltblown composite spinning method, in which each of the fiber filaments constituting the nonwoven web is a core-

The nonwoven fabric may be a nonwoven fabric having a double-sided cross-sectional structure or a side-by-side structure. Alternatively, the meltblown composite spinning nonwoven fabric and the spunbond composite spinning nonwoven fabric produced by the meltblown composite spinning method and the spunbond composite spinning method may be used. It may be a nonwoven fabric having a multi-layered structure in which the bond-bonded radiation nonwoven fabric is laminated in several layers.

Here, the meltblown method as a method of producing a nonwoven fabric is a method in which a filament is formed by injecting a high-temperature high-pressure air stream to an outlet of a spinning nozzle for extruding and discharging a raw material melt such as a synthetic resin, . And the spun bond method is a method of collecting the filaments discharged using an extruder and forming them into a sheet.

4 is an enlarged view of the portion C of the fiber grille net 2 shown in FIG. 3, wherein the intersecting portions 30 where the longitudinal fiber ribs 10 and the transverse fiber ribs 20 meet, And is fixed by being bundled and fixed by the fibers (35).

4, the geogrid 1 for reinforcing an asphalt road according to the present invention comprises longitudinal fiber ribs 10, which are composed of a plurality of longitudinal fiber yarns 11, 12 in the structure of the fiber grid net 2, The crossing portions 30 of the transverse fiber ribs 20 made of the transverse fiber yarns 21 are wound and bundled with the bundled fine wire fibers 35 so that the longitudinal fiber ribs 10 and the transverse fiber ribs 20 are tightly Lt; / RTI > At this time, the bundled fine filament fibers 35 do not simply stay wrapped around the crossing portions 30 but penetrate the thickness in the width area portions of the longitudinal fiber ribs 10 and the transverse fiber ribs 20 So as to firmly engage with the fiber ribs 10, 20 as if sewing.

The lattice net 2 shown in Fig. 4 is merely composed of a structure in which the transverse fiber yarns 21 pass over the longitudinal fiber yarns 11 and 12 so as to cross each other. However, The transverse direction fiber yarn 11 passes between the first longitudinal fiber yarn 21 and the second longitudinal fiber yarn 22 and the vertical position of the first longitudinal fiber yarn 11 and the second longitudinal fiber yarn 12 alternate with each other It is also possible to make a fiber grille net 2 woven by a weaving method.

The size of the lattice holes 31 is preferably set to 10 to 30 mm by the longitudinal fiber ribs 10 and the transverse fiber ribs 20 of the fiber grating net 2, It is preferable to set it to 15 to 25 mm. The planar width of the fiber ribs 10 and 20 is preferably set to 2 to 7 mm.

The size of the lattice hole 31 of the fiber grid 2 is related to the size of the aggregate used in road pavement. That is, in consideration of the fact that the nominal maximum value of the aggregate currently used for the surface layer of the ascon is 19 mm and the nominal maximum value of the coarse aggregate used for the asconcrete layer is 25 mm, the coarse aggregate of the lower layer It is advantageous for the aggregate of the upper layer (surface layer of asbestos) to be able to be embedded in the lattice hole 31 to enhance the road support force of the geogrid.

If the grid holes 31 of the grid 2 are too large, the area occupied by the fiber ribs 10 and 20 per unit area of the geogrids 1 becomes too small, which may result in insufficient rigidity and durability of the geogrid , There is a problem that when the grid holes 31 are too small, aggregates in the upper and lower layers of the geogrid are sandwiched by the grid holes 31 of the geogrid so that it is difficult to exhibit the reinforcing effect of being blocked from moving.

On the other hand, it is preferable that the road-reinforcing geogrid 1 according to the present invention maintains the area ratio of the openings (grid holes) to the total area thereof at 50 to 70%.

5 is a sectional view of the 'A' portion of the asphalt road reinforcing geogrid 1 shown in FIG. 1, and FIG. 6 is a sectional view taken along the line B-B of FIG.

5, a coating layer 41 impregnated with an asphalt resin coating liquid is formed on the surfaces of the two longitudinal fiber yarns 11 and 12. Silica powder 4 is coated on the surface of the coating layer 41, And the nonwoven fabric 3 is attached under the longitudinal fiber yarns 11, 12. At this time, an adhesive layer 42 is formed between the longitudinal fiber yarns 11, 12 and the nonwoven fabric 3. At this time, the thickness of the coating layer 41 is preferably set to 10 to 500 mu m, and the siliceous powder 4 is preferably a material having a particle size of 0.1 to 0.4 mm.

For example, the longitudinal fiber yarns 11 and 12 shown in FIG. 5 have a structure in which 1,000 to 4,000 glass fiber filaments are integrated, each of the glass fiber filaments has a diameter or thickness of 16.5 to 17.5 μm, The tex of one longitudinal glass fiber yarn obtained by integrating such minute glass fiber filaments is 1,100 to 1,300 g / km, the tensile strength is 1,200 to 1,300 MPa, and the elastic modulus is 122,000 to 126,000 MPa.

5, the asphalt resin coating layer 41 coated on the surfaces of the glass fibers 11 and 12 by an impregnation method is formed using a coating agent in which an asphalt component and a non-asphalt resin component are mixed. The asphalt component in the coating agent It is used to improve the bonding and waterproof function between the glass fiber filaments and to increase the bonding force with the upper layer of the ascon, and the non-asphalt resin component is used to impart flexibility to the glass fiber. When the fiber ribs 10 and 20 composed of glass fiber yarn are coated only with bituminous asphalt components, they may be too stiff and hard to be flexible. The actual packaging environment of the road is rugged due to residual stones and crushed stone, If the flexibility of the net 2 is insufficient, the fiber ribs 10 and 20 may be broken and broken. Therefore, the geogrid 1 of the present invention can increase the flexibility of the fiber lattice 2 by adding a non-asphaltic resin component when coating the surface of the fiber lattice net 2, thereby improving the adaptability and durability in the road lattice It has the advantage of height.

FIG. 6 shows a cross-sectional structure along the line B-B in the asphalt road reinforcement geogrid 1 shown in FIG. 1, and the joint structure of the intersection portion 30 can be understood with reference to this. When the transverse fiber yarn 21 and the first and second directional fiber yarns 11 and 12 are overlapped with each other at the intersection portion 30, an asphalt resin coating layer 41 is formed on an outer portion surrounding the entire fiber yarns And the silica sand powder 4 is attached to the outside of the coating layer 41 as well.

Due to the height difference between the portion 30 where the transverse fiber yarn 21 and the first and second directional fiber yarns 11 and 12 overlap each other and the other portion, the transverse fiber yarn 21 has a cross- The nonwoven fabric 3 is also bent at the outer portion of the crossing portion 30 by the bent portion 30b so that the width of the transverse portion of the fiber ribs 30, (20). 6, reference numeral 3a denotes a portion where the nonwoven fabric 3 is adhered to the transverse fiber rib 20 in an area other than the crossing portion 30. [

7 is a schematic overall configuration diagram of a system 100 for manufacturing a geogrid 1 for asphalt road reinforcement including a superabsorbent nonwoven fabric according to the present invention.

Referring to FIG. 7, the system 100 for manufacturing a road-reinforcing geogrid according to the present invention comprises a fiber selected from glass fiber, carbon fiber, aramid fiber, acrylic fiber, polyamide fiber, polyester fiber, polypropylene fiber, A fiber weaving machine 103 for fabricating a fiber lattice mesh fabricated by crossing in the longitudinal direction and the transverse direction by using the fiber weaving machine 103 and the fiber lattice fabric 2 made by the fiber loom 103 are immersed in the asphalt resin coating liquid composition, A drying unit 120 for drying and curing the asphalt resin coating solution impregnated in the fiber grille net 2, a silicate powder 4 on the surface of the fiber grille mesh 2, A silicate spray device 130 for bonding silica sand powders to the surface of the asphalt resin coating layer, an adhesive agent (not shown) on the bottom surface or at least one side of the fiber mesh net 2 A nonwoven fabric bonding apparatus 155 for bonding the nonwoven fabric 3 to the surface of the fiber grille net 2 coated with the adhesive and a nonwoven fabric 3 to form a finished product And a geogrid wind-up roll 160 for winding the geogrid 1 for reinforcing the asphalt road in roll form.

A plurality of warp yarns necessary for the weaving operation of the fiber weaving machine 103 are arranged in parallel to the inclined beam 101 in accordance with a predetermined length, width and density condition and are wound in a uniform tension, A plurality of warp yarns 102 supplied from the weft supply unit 104 correspond to the longitudinal fiber yarns 11 and 12 in the geogrid 1 for reinforcing asphalt of the present invention shown in FIG. The supplied weft yarn corresponds to the transverse fiber yarn 21.

In FIG. 7, a plurality of warp yarns 102 unrolled from the warp beam 101 are combined with weft yarns supplied from the weft supply unit 104 in the fabric loom 103 to form a lattice. Here, the weft supply unit 104 refers to, for example, a shuttle having a weft wood board and a means for moving the weft, and a shuttle-free weaving machine that does not use a recently- In this case, a separate weft supply means acts to insert the weft between warp yarns.

On the other hand, the fiber loom 103 is provided with an additional device (not shown) that can perform the sewing work on the warp yarns and the weft yarns using the bundled fine fiber yarns 35 (see Fig. 4).

The coating unit 110 shown in FIG. 7 contains a coating solution for asphalt resin composition 112 in a coating liquid tank 103. The fiber grid 105 that is woven in the form of a lattice in the fiber loom 102 enters the coating liquid tank 103 of the coating unit 110 through the first guide roller 106 and is impregnated with the coating liquid, After passing through the second guide roller 111 again, enters the drying unit 120 through the second guide roller 107. [

The drying unit 120 includes heaters or heaters 120 arranged in a vertical direction with respect to a path through which the fiber grille 105 impregnated with the coating liquid passes, and supplies hot air to the fiber grille 105 Allow the coating liquid to dry and cure quickly. When the fiber lattice network 105 passing the drying unit 120 passes the sand duster spraying apparatus 130, the fine silica dusts 4 are sprayed onto the coating layer 41 on the surface of the fiber lattice network 105 6).

The silk yarn applying device 130 includes an upper hopper 131 containing silica sand powders 4 and a hopper lower body 132 extending downward from the hopper 131. The hopper lower body 132, There is provided a fixed amount feeding gear 133 for feeding the silk fiber powders 4 downward by a predetermined amount. By thus attaching the silica sand powders 4 to the surface of the coating layer 41 (FIGS. 5 and 6) of the fiber mesh lattice 105, the properties of the sticky asphalt resin coating layer 41 are suppressed to some extent, Whereby the geogrid 1 can be rolled and stored.

Subsequently, an adhesive 142 is applied to the bottom surface of the fiber grille 105 passing through the sandpaper spraying device 140. The adhesive applicator 140 rotates while partially wetted with the adhesive solution tank 142 containing the adhesive solution 142 and the adhesive solution 142 in the adhesive reservoir tank 141, And a squeegee which scrapes off the adhesive excessively adhered to the surface of the adhesive applying roller 144 at an end always contacting the adhesive applying roller 144. The adhesive applying rollers 144,

In the present invention, the adhesive applied to the underside of the fiber grid 105 by the adhesive applicator 140 is used for attaching the nonwoven fabric to the meltblown composite spinning nonwoven fabric and / or the spunbond composite spinning nonwoven fabric. It is preferable to use a synthetic resin-based adhesive capable of exhibiting good adhesive strength. According to an embodiment of the present invention, it is preferable to use a thermoplastic resin adhesive, and it is preferable to use 38 to 61% by weight of an acrylate copolymer modified modified polymer resin, 36 to 59% by weight of water, 1 to 5% by weight, and the viscosity of the adhesive is preferably 200 to 2,200 cps.

Furthermore, the present inventor has conducted a number of experiments, and found that the adhesive applied to the underside of the fiber grating net 105 includes 49% by weight of an acrylate copolymerized modified polymer resin, 49% by weight of water and 2% It was found that the optimum adhesive performance was exhibited.

In addition, in the present invention, as the adhesive applied on the bottom surface of the fiber grille 105, in addition to the above-mentioned acrylate-based adhesive, glue, vinyl acetate adhesive, nitrocellulose and synthetic rubber type adhesives can be used .

7, the non-woven fabric binding apparatus 155 attaches the nonwoven fabric 3 to the underside of the fiber lattice network 105 on which the adhesive agent is applied by the adhesive applying apparatus 140 to the bottom. Here, the nonwoven fabric 3 fed from the nonwoven fabric supplying roll 150 may be a meltblown meltblown web produced by integrating a plurality of filaments made to have a two-component cross-sectional structure by a meltblown composite spinning process Non-woven fabric (see Figs. 11 to 15). Alternatively, the nonwoven fabric 3 may be a multi-layered nonwoven fabric formed by laminating and laminating a plurality of nonwoven fabrics produced by a spunbond composite spinning process produced by a meltblown composite spinning process 16 and Fig. 17).

The nonwoven fabric 3 unwound from the nonwoven fabric supplying roll 150 passes through the third guide roll 151 and the fourth guide roll 152 and is then joined to the bottom surface of the fiber grille 105, 153 to be integrally bonded to the fiber lattice network to complete the geogrid 1 for reinforcing asphalt roads of the present invention. The finished geogrids 1 are wound on a winding roll 160 and stored and managed in a roll form.

FIG. 8 is a table summarizing the components and composition ratios of the coating liquid composition coated on the fiber grille net 2 of the geogrid 1 for asphalt road reinforcement according to the present invention, FIG. 10 is a table summarizing the composition ratios of all the components of the coating liquid composition shown in FIG. 8. FIG. 10 is a table summarizing the composition ratios of the asphaltic resin emulsion as two components.

First, referring to the composition ratio table in FIG. 8, the components of the asphalt resin composition impregnated in the fiber lattice network composed of glass fibers (reference numeral 2 in FIGS. 1 to 6 and reference numeral 105 in FIG. 7) 50.3 to 61.5% by weight of an asphalt emulsion, 23.1 to 35.7% by weight of a non-asphaltic resin emulsion as a second component, 5.0 to 13.4% by weight of a filler as a third component and 1.5 to 4.5% by weight of an additive as a fourth component.

The asphalt emulsion or the emulsified asphalt as the first component is obtained by making the asphalt into fine particles so that it can be used at room temperature without heating the solid or semi-solid asphalt. The water and the asphalt They are not mixed with each other, so emulsifiers are added and milled at high speed to disperse the asphalt particles evenly into the water. The size of the asphalt particles in the emulsified asphalt is in the range of 1 to 5 탆 in diameter and acts to charge the surface of the asphalt particles to prevent the particles from sticking to each other.

Asphalt emulsion is a dark brown glazed liquid. When sprayed on aggregate, water and asphalt are decomposed and only asphalt is attached to the surface of aggregate and turns black. Emulsified asphalt can be largely classified into cationic, anionic and nonionic systems.

It is preferable to use a blown asphalt having an invasion degree of 10 to 40 for the asphalt emulsion as the first component, and the concentration of the asphalt emulsion is preferably 52 to 70%. Here, the concentration of the asphalt emulsion refers to the volume fraction between the asphalt particles dispersed in a dispersed phase in the emulsion and the water spreading in a continuous phase.

The non-asphaltic resin emulsion as the second component is added to the fibrous grid net 2 of the geogrids 1 for imparting special properties such as flexibility and the detailed structure thereof is summarized in the table of FIG. That is, the asphaltic resin emulsion may contain 50 to 65% by weight of PVC acrylic latex, 5 to 15% by weight of internal plasticized PVC latex, 5 to 20% by weight of styrene-acrylic acid latex and 5 to 17% by weight of ethylene- .

Here, the term "emulsion" refers to a state in which water and oil are mixed. In this case, a state in which oil (or resin) is uniformly mixed with fine particles is referred to as "oil in water emulsion" The dispersion of water into fine particles is called water in oil emulsion. This mixture of non-intermixing materials is made possible by surfactants. The surfactant is a special substance having a hydrophilic part and a lipophilic part in one molecule, and enables the mixing of the emulsion.

The emulsion polymer emulsion-polymerized is called latex. Therefore, the PVC acrylic latex, the inner plasticized PVC latex, the styrene-acrylic acid latex and the ethylene-acrylic acid latex contained in the non-asphaltic resin emulsion as the second component all emulsify, polymerize in the water in the presence of the surfactant They are.

The plasticizer is a substance which softens the PVC resin. The plasticized PVC latex is plasticized by copolymerizing vinyl acetate or ethyl acrylate.

The concentration of the non-asphaltic resin emulsion as the second component, that is, the volume fraction of the dispersed phase resin component and the continuous phase in the emulsion is preferably maintained at 50 to 70%.

As a result of a number of experiments conducted by the present inventors, it has been found that the asphaltic resin emulsion as the second component in the coating liquid contains 61.5% by weight of PVC acrylic latex, 11.3% by weight of internal plasticized PVC latex, 13.8% by weight of styrene- And 13.4% by weight of acrylic acid latex (see Fig. 9).

Referring again to FIG. 8, it is preferable to use calcium carbonate as the inorganic filler as the filler as the third component constituting the coating liquid.

The additive as the fourth component is preferably used by adding a small amount of carbon black, a thickener, a defoamer, a nonionic surfactant, a fluorine surfactant and an acrylic solution polymer.

As a result of many experiments by the present inventors, it has been found that the above asphaltic resin composition contains 55.0 wt% of the asphalt emulsion as the first component, 32.0 wt% of the asphaltic resin emulsion as the second component, 10.0 wt% of the filler as the third component %, And 3.0 wt% of the additive as the fourth component, it was possible to obtain an optimum performance as a coating solution for a fiber lattice network.

In FIG. 10, the components of the coating liquid composition coated on the fiber grille net 2 of the geogrid 1 of the present invention are summarized. That is, the coating liquid composition used in the present invention may contain 50.3 to 61.5% by weight of asphalt emulsion, 23.1 to 35.7% by weight of non-asphaltic resin emulsion, 5.0 to 13.4% by weight of filler, 0.3 to 0.8% by weight of carbon black, 0.2 to 0.7% 0.2 to 0.7% by weight of a defoaming agent, 0.3 to 0.8% by weight of a nonionic surfactant, 0.2 to 0.7% by weight of a fluorinated surfactant and 0.3 to 0.8% by weight of an acrylic solution polymer. Among the above components, carbon black exhibits an effect of coloring black, and a thickener mainly uses a polyacrylic acid thickener, which enhances the viscosity of the entire coating liquid. The antifoaming agent serves to remove the bubbles generated during the production of the coating liquid and to stabilize the emulsion, and a silica antifoaming agent and the like can be used. Of these components, nonionic surfactants, fluorinated surfactants and acrylic solution polymers serve as emulsifiers to stabilize the emulsion.

According to the experiment conducted by the inventors of the present invention, the coating liquid composition was prepared by mixing 55.0 wt% of an asphalt emulsion, 32.0 wt% of a non-asphaltic resin emulsion, 10.0 wt% of a filler, 0.5 wt% of carbon black, 0.5 wt% of a thickener, 0.5 wt% , 0.5% by weight of a surfactant, 0.5% by weight of a fluorinated surfactant and 0.5% by weight of an acrylic solution polymer (see FIG. 10).

型, core-sheath type) 또는 사이드 바이 사이드(side by side) 형과 같은 이중구조의 단면 형태를 갖게끔 멜트블로운 부직포를 제조하는 장치(200)의 개략적인 구성도이다.Fig. 11 is a process diagram of a manufacturing apparatus for a superabsorbent nonwoven fabric 3 included in the geogrid 1 for reinforcing asphalt roads according to the present invention. In particular, each of the fibrous filaments constituting the nonwoven fabric is co- Mold

(200) for producing a meltblown nonwoven fabric having a cross-sectional shape of a double structure such as a core-sheath type or a side by side type.

11, the configuration of the apparatus 200 for manufacturing a meltblown composite spinning nonwoven fabric according to one embodiment of the present invention is a device for producing a nonwoven fabric material that can be used as the nonwoven fabric 3 applied to the geogrid 1 of the present invention. Is introduced. The meltblown composite spinning nonwoven fabric manufacturing apparatus 200 is configured such that molten resins melt-extruded from two separate extrusion apparatus parts 210 and 220 using different synthetic resin polymer materials are transported along respective extrusion lines Are simultaneously emitted in the radiator 230 and through one nozzle 232 to produce meltblown fiber filaments 234 having a dual cross-sectional structure.

11, the two extruding units, i.e., the first extruding unit 210 and the second extruding unit 220 are the same as the conventional meltblown equipment. The reason for separating the extruding units 210 and 220 from each other is to use two different kinds of polymers. For example, in the first extruding unit 210, polypropylene is melt-extruded, (220) can be operated by a method of melt-extruding polyethylene. The hopper 211 and 221 of the extruder units 210 and 220 are loaded with the synthetic resin polymer raw materials provided as chips in the form of rice balls and enter the extruders 212 and 222 through the hoppers 211 and 221 The polymers are melted in the extruders 212 and 222 heated by the built-in heaters 214 and 224 and simultaneously they are forcibly transported toward the molten resin transfer lines 217 and 227 by the screws 213 and 223. In this process, the molten polymers are removed by impregnation through the filters 215 and 225, and then quantitatively transferred by a metering pump.

The polymer melts supplied through the two extrusion apparatuses 210 and 220 are merged into one flow at the nozzle tube 231 of the nozzle unit 232. At this time, the inside of the nozzle tube body 231 of the nozzle unit 232 The two kinds of polymer melts are radiated to the outside through the spinneret end 232a of the radiator 230 while being bounded to each other by the separation wall 231a. The radiator 230 is provided with a nozzle tube body 231 in a vertical direction and is capable of blowing hot air at a high temperature and a high pressure through air passages 233 formed in a side surface thereof, The polymer melt can be made of fine filament fibers 234.

The meltblown fiber filaments 234 emitted from the emitter 230 are collected in a mesh conveyor 240 that functions as a collector and then conveyed to the press rolls 244a and 244b to compress the thickness Meltblown nonwoven fabric 234b. A suction device 243 is installed under the mesh of the mesh conveyor 240 to suck the filaments 234 so that the meltblown fiber filaments 234 are formed on the mesh of the mesh conveyor 240. [ Can be laminated to form a meltblown web 234a. At this time, the air 245 sucked into the intake device 243 is recycled through a predetermined filtering device and recycled to the high-temperature high-pressure air of the radiator 200 or discharged to the outside of the apparatus. The mesh conveyor 240 is operated by a drive roller 241 and a driven roller 242 and the meltblown web 234b whose thickness is squeezed by the press rolls 244a and 244b is wound up as a finished non- Roll 250 and stored.

delete

At this time, the elastomer as the 'first component material' injected into the first extruding unit 210 has the number of the two polymers represented by the cross-sectional structure of the sidebish type meltblown filament 234 shown in FIG. 13 And the cross-sectional structure of the sheath-core type meltblown filament 234 shown in Fig. 15 can be formed in any one of the portions 234-1 and 234-2, It is preferable that the first thermoplastic polymer resin portion 234-1 be the first thermoplastic polymer resin portion 234-1.

The material prepared by mixing 1 to 5% by weight of the sulfonic-based hydrophilic surfactant with the elastomer as the 'second component material' to be fed into the second extruder unit 220 is the same as that of the sidebish- Core resin portions 234-1 and 234-2 in the cross-sectional structure of the melt blown filament 234 of the shape shown in Fig. 15, In the cross-sectional structure of the meltblown filament 234 of the first thermoplastic polymer filament 234, it is preferable that the second thermoplastic polymer resin portion 234-1 is located at the outer portion.

That is, when fabricating the meltblown composite radial nonwoven fabric according to the present invention, when the fiber filaments are constituted by the cross-sectional shape of the inside portion and the outer portion surrounding the inside thereof, the elastomer It is advantageous that the component is located on the outer surface. This is because the moisture present in the tack coat is effectively absorbed by the portion of the fibrous filament of the nonwoven web having a strong hydrophilic property (the second thermoplastic polymer resin portion).

On the other hand, as a pretreatment process for preparing the 'second component material' before the meltblown process, any one selected from the group consisting of a polypropylene elastomer, a polyester elastomer and a polybutyl terephthalate elastomer, 1 to 5% by weight of a hydrophilic surfactant is mixed and dried at a temperature of 50 to 70 캜 for about 3 to 6 hours.

According to the experiment of the inventors of the present invention, it is preferable to use a polyester-based elastomer as the 'first ingredient material' used in the meltblown composite spinning and use a polypropylene-based elastomer as the 'second ingredient material' .

When the weight ratio of the sulfone-based hydrophilic surfactant to be mixed with the elastomer material used as the raw material of the second extruding unit 220 is less than 1% by weight, the absorbent performance of the meltblown nonwoven fabric produced is poor. On the other hand, , The combination with other component resin parts not having a surfactant may be a problem.

The meltblown composite spinning apparatus 200 of FIG. 11 adjusts the spinning conditions of the spinner 230 to adjust the spinning conditions of the nano-particles of less than 10 μm through fine nozzles such as 25 holes, 35 holes, 50 holes, It is possible to produce fine fibers. The filaments constituting the meltblown composite radial nonwoven fabric produced in this way have a diameter of about 1 to 10 mu m and a large number of filaments are integrated to form a web, so that not only the rigidity and the durability are excellent but also the hydrophilic properties A large amount of water can be quickly absorbed.

On the other hand, it is preferable that the nonwoven fabric 3 applied to the geogrid 1 of the present invention has a capacity capable of sufficiently absorbing moisture in the tack coat so that the basis weight becomes 25 to 400 g / m 2.

12 shows an example of the cross-sectional structure in the radial direction of the nozzle tube 231 in the meltblown composite spinning nonwoven fabric manufacturing apparatus 200 shown in FIG. 11, in which the tube tube 231 has a straight- The molten resin transfer path in the nozzle tube body 231 is divided into two sections 261 and 262 by providing a wall 231a and the first extruded molten resin 211b and the second extruded molten resin And the extruded molten resin 221b can be respectively put into the mold. In Fig. 12, reference numeral 211c denotes a first molten resin transfer line, and 221c denotes a second molten resin transfer line.

13 is a sectional view in the thickness direction of the meltblown composite yarn filament 234 produced by the nozzle tube 231 shown in FIG. 12, and shows a so-called side by side type cross-sectional structure Is shown.

14 shows another example of the cross-sectional structure in the radial direction of the nozzle tube 231 in the meltblown composite spinning nonwoven fabric manufacturing apparatus 200 shown in Fig. 11. In the nozzle tube 231, The molten resin transfer passage is divided into two sections 263 and 264 by providing a wall 231b and the first extruded molten resin 211b and the second extruded molten resin 221b are divided into the divided spaces, Respectively, are shown. In Fig. 14, reference numeral 211c denotes a first molten resin transfer line, and 221c denotes a second molten resin transfer line.

Fig. 15 is a cross-sectional view in the thickness direction of the meltblown composite filament yarn 234 produced by the nozzle tube 231 shown in Fig. 14, and shows a so-called "core-sheath type" cross-sectional structure. As shown in FIG. 15, the meltblown composite filament filament 234 has a first thermoplastic polymer resin portion 234-1 having a circular section inside and a ring-shaped second thermoplastic polymer resin portion 234-1 A branch portion 234-2 is disposed.

12 and 14, the meltblown nonwoven fabric manufacturing apparatus 200 according to the present invention can be manufactured by forming separation walls 231a and 231b in a single nozzle body 231 so that two kinds of polymer melts And when they are radiated as a boundary, they are integrated to form a single filament. 12, when a straight separating wall 231a is provided in the nozzle tube 231, the filament 234 passing through the nozzle tube 231 is divided into a half-moon section The first thermoplastic polymer resin part 234-1 and the second thermoplastic polymer resin part 234-2 are combined to form a double structure. The reason why the nonwoven fabric 3 used in the geogrid 1 in the present invention is referred to as " meltblown composite spinning nonwoven fabric " is that each of the filament filaments constituting the nonwoven web is composed of two kinds of polymers formed by melting two kinds of polymers, Sectional structure.

Meanwhile, the nonwoven fabric used in the geogrid 1 for reinforcing asphalt roads according to the present invention can be used alone or in combination with the meltblown composite spinning nonwoven fabric 234b described in FIGS. 11 to 15, A multi-layered nonwoven fabric may be employed in which spunbond composite spinning nonwoven fabrics manufactured by separate spunbond processes are disposed above and below the meltblown nonwoven fabric to form multiple layers.

Therefore, a process for producing a spunbond composite spinning nonwoven fabric by the spunbond process will be described.

FIG. 16 is a schematic view of the apparatus 300 for manufacturing a spunbond composite radial nonwoven fabric, in which two melt extruded polymer melt melts in two separate extruder units 310 and 320 into a single spinner 330 To form a spunbond fiber filament 333 in a double-sided structure.

Two types of synthetic resin polymer raw materials 311a and 321a are stacked in the form of chips in the hopper 311 of the first and second extruder units 310 and 320. The extruders 312 and 322 The molten polymers are removed by impurities through filters 315 and 325 and metered by metering pumps 316 and 326. The two polymer melts transferred into the two streams are combined into one at the radiator 330, at which time the flow rates of the polymer melts can be controlled by the valves 317, 327. The spinning nozzle 331 of the spinning device 330 has a separating wall (not shown) in the shape of a straight line or a cylinder inside the nozzle tube, as in the case of the meltblown nonwoven fabric manufacturing apparatus 200 of FIGS. 11 to 15, And two kinds of polymer melts are combined by the separation wall so that the two kinds of polymer melts can be integrated into a state in which the two kinds of polymer melts are bounded and separated.

The spunbond filaments emitted from the spinning nozzle 331 are pulled in the longitudinal direction through the spinning tube 332 under the stretching machine 334 to be made into filaments 333 of very thin filaments. The spunbond long filament filaments 333 are spread apart over a mesh conveyor belt 340 that functions as a collector and the spunbond filament web is passed through the first conveyor belt 345 and the second conveyor belt 346 to the dryer 350 And after the spunbonded nonwoven fabric 333b is completed by drying it, it is wound on the winding roll 370 through the conveying rollers 361, 362, and 363 of the winding unit 360. [

The suction device 341 installed inside the mesh conveyor belt 340 sucks the air of the stretching device 334 so that the filaments 333 can be stretched well and the sucked air can be recycled And discharged to the outside. Reference numeral 340a denotes a roller for driving and supporting the mesh conveyor belt 340, and reference numerals 340b, 340c and 340d denote support rollers for supporting the respective portions of the mesh conveyor belt 340. The thermal calendar rolls 351 in the dryer 350 function to compress the spunbonded nonwoven web 233a conveyed by the second conveyor belt 346 into heat.

In the spunbond process of FIG. 16, the 'first component material' used as the raw material of the first extruder unit 310 is preferably a polyester or polyethylene polymer material, and the second extruder unit 320 ), It is preferable to use a hydrophilic material by adding 1 to 5% by weight of a hydrophilic surfactant to a polyester-based or polyethylene-based polymer material. When the fiber filament produced by spun bond composite spinning is of the sheath-core type, the polymer resin portion located at the outer periphery of the cross-sectional structure is made of the second ingredient material, so that the water absorption performance can be enhanced.

17 is a cross-sectional view of a meltblown composite nonwoven fabric manufacturing apparatus 200 shown in Fig. 11 and meltblown nonwoven fabrics and spunbond nonwoven fabrics respectively produced by the spunbond composite nonwoven fabric manufacturing apparatus 300 shown in Fig. 16, A nonwoven fabric lapping apparatus 400 according to an embodiment of the present invention.

17, nonwoven fabric supply roll rests 410 are provided with nonwoven fabric supply rolls 411, 412, and 413 capable of supplying a plurality of nonwoven fabrics. 17, it is assumed that three nonwoven fabric supply rolls are installed, assuming that three nonwoven fabrics, that is, one meltblown composite spinning nonwoven fabric 412a and two spunbond composite spinning nonwoven fabrics 411a and 413a are joined together Respectively. The first nonwoven fabric 411a supplied from the first nonwoven fabric supplying roll 411 is conveyed to the conveying conveyor belt 420 through the first receiving guide rollers 401 and is supplied from the second nonwoven fabric supplying roll 412 The second nonwoven fabric 412a is laminated on the first nonwoven fabric 411a on the conveying conveyor belt 420 via the second receiving guide rollers 402 and the first pressing roller 423. [ The third nonwoven fabric 413a supplied from the third nonwoven fabric supplying roll 413 is conveyed to the conveying conveyor belt 420 through the guide roller 404 and the third receiving guide rollers 403 and the second pressing roller 424. [ On the first and second nonwoven fabrics 411a and 412a. The three sequentially stacked nonwoven fabrics 450 are compressed by passing through a space between the third pressing roller 425 and the receiving roller 425a, and then the needle punching method and / They are integrated by a method of thermocompression bonding. The finished nonwoven fabric 451 is wound on the nonwoven fabric winding roll 441 provided on the winding roller 440 after passing through the guide rollers 431a and 431b. Reference numeral 442 denotes a support for supporting the winding means including the winding roller.

17 is characterized in that a meltblown composite spinning nonwoven fabric 412a is disposed in the middle, and spunbond composite spinning nonwoven fabrics 411a and 413a are arranged above and below the spinning nonwoven fabric.

Here, the meltblown composite spinning nonwoven fabric located in the middle layer of the multi-layered nonwoven fabric preferably accounts for 40 to 60% of the total nonwoven fabric weight, and the upper and lower spunbond nonwoven fabrics occupy 40 to 60% . The basis weight of the meltblown nonwoven fabric is preferably 15 to 250 g / m 2, and the basis weight of the spunbond nonwoven fabric is preferably 5 to 130 g / m 2.

The multi-layered nonwoven fabric employed in the geogrid of the present invention is particularly excellent in the absorbency of the meltblown composite radial nonwoven fabric layer positioned at the middle and the upper and lower spunbonded nonwoven fabric layers are excellent in blocking moisture . Therefore, by using the geogrid for road reinforcement according to the present invention, it is possible to rapidly absorb a large amount of water in the tack coat and to block the water contained in the meltblown non-woven layer from coming out again, There is an advantage that can help.

On the other hand, the polypropylene used as the material of the nonwoven fabric employed in the geogrid (1) of the present invention has a melting point of 165 to 175 DEG C, so that melting by the temperature of the asphalt applied at the surface layer of the ascon (about 120 to 150 DEG C) .

18 is a flowchart showing the operation of the road maintenance method using the geogrid for reinforcing asphalt roads including the superabsorbent nonwoven fabric according to the present invention. 18, the surface layer of the asphalt pavement or the cement concrete corresponding to the repair area of the asphalt pavement road or the cement concrete pavement which is a problem due to the occurrence of portholes, cracks, wheel pavement, etc. is cut and removed ), And the bottom surface of the asbestos layer or intermediate layer thus revealed is blown off with high-pressure air and the bottom surface is cleaned (step S2). When the bottom surface is cleaned, an asphalt emulsion as a tack coating is applied on the bottom surface using a distributor (step S3). At this time, the amount of the tack coating to be applied is preferably 1 to 5 mm. After completion of the tack coating, the geogrid 1 for reinforcing the asphalt road including the superabsorbent nonwoven fabric according to the present invention is installed (Step S4). As described above, the geogrid 1 of the present invention is a superabsorbent, Since a nonwoven fabric made of a multi-layered structure of a radial nonwoven fabric or a meltblown composite radial nonwoven fabric and a spunbond composite radial nonwoven fabric is adopted, it is possible to absorb moisture in the tack coat sprayed on the bottom surface in 5 to 10 minutes to promote curing of the tack coating There is an effect. Accordingly, the present invention has an advantage that the asphalt overlay work and the compaction work can be performed by installing the ascon in a very short time, for example, 10 to 20 minutes after the installation of the geogrids (step S4) (step S5). Finally, road crossover can be resumed after completion of curing and cleaning of the asphalt overlay layer, that is, the surface layer of ascon (S6).

For the reference, the compaction of the surface layer of the ascon is carried out by using a machine roller, a tire roller, and a tandem roller. In such a three-step compaction process, four machine cartridges, ten tire rollers And four times of tandem rollers.

19 and 20 show a state of repairing an asphalt road using a geogrid for reinforcing an asphalt road including a superabsorbent nonwoven fabric according to the present invention.

19, the road 7c that has undergone the maintenance and reinforcement work according to the present invention is constructed such that the asphalt road reinforcement geogrid 1 of the present invention is interposed between the asbestos layer 6 and the asbestos surface layer 7 And the aggregate of the surface layer 7 of the ascones is partially penetrated through the grid holes 31 of the geogrids 1, the phenomenon that the surface layer 7 of the ascones is pushed on the geogrids 1 can be completely prevented. The asbestos surface layer 7 is formed on the surface of the asbestos layer 6 in a state in which the water in the tack coat 5 is quickly and completely absorbed by the nonwoven fabric 3 of the geogrid 1 and the tack coat 5 is sufficiently cured. So that the bonding between the layers is robust. As a result, the defect such as lifting of the surface layer 7 after the repair work is not generated at all.

Next, a process of developing and installing the geogrid 1 of the present invention at an asphalt road reinforcement site will be described with reference to FIG. A device vehicle for installing the geogrids 1 is a kind of vehicle similar to or similar to a forklift, and a winder 65 is installed in front of the winder 65 by a reinforcing structure and a winder roller 66a is installed at the end of the winder 65, The winding roller 66a is fitted with a feed roll 66 wound with a geogrid according to the present invention.

The construction apparatus vehicle 60 runs on the floor 7b where the surface layer of the road has been removed for reinforcement, and the geogrid 66 is released from the winding roller 66a and laid on the floor surface. At this time, the geogrids 1 are pressed on the ground through the pressing roller 67, and then the front wheel 63 and the rear wheel 64 of the vehicle are laid on the ground. The geogrid 1 according to the present invention has the asbestos powder 4 adhered on the surface of the fiber mesh net 2 on which the asphalt resin coating layer 41 is formed and therefore the sticky property of the asphalt resin coating layer 41 is somewhat Is suppressed. The geogrid 1 according to the present invention can be pulled up, pushed or twisted on the wheels even if the geogrid 1 is stepped on by the front and rear wheels 63 and 64 of the pressing roller 67 and the vehicle 60. [ No phenomenon occurs at all.

Referring to FIG. 20, a cross-sectional structure of a road to be reinforced by using the geogrids according to the present invention will be described. A road bed 9a made of the ground of the ground exists at the bottom of the road, And an auxiliary layer 9 made of sand and there is an ascon base layer 6. A prime coating layer 8 made of an asphalt emulsion is present between the auxiliary layer 9 and the ascon base layer 6 .

In the ordinary road reinforcement work, the surface layer 7a is removed and the aspheric substrate 6 or the intermediate layer is exposed. Then, the bottom surface is coated with the tack coat 5, the geogrid is installed, and the asphalt overlay construction The surface layer of the ascon) and the compaction work will be done.

20, reference numeral 61 denotes a driver seat of the construction apparatus vehicle 60, and 62 denotes a steering wheel. And reference numeral 7a denotes an existing asconic surface layer which has not been removed.

21 is a sectional view of the road 7c after repacking of the asphalt road 7c is completed through the work process shown in Figs. 19 and 20. Fig. 21, after the tack coating 5 is formed on the ascon substrate layer 6 or the intermediate layer and the geogrid 1 according to the present invention is installed on the tack coating layer 5, have. In Fig. 21, reference numeral 7d denotes a cut surface existing between the existing asconic surface layer 7a and the newly-applied asconic surface layer 7. [

22 is a sectional view of the asphalt road 7c when the asphalt road repair and reinforcement process is completed using the geogrid for reinforcing the asphalt road including the superabsorbent nonwoven fabric according to the present invention. The nonwoven fabric 3 of the geogrids 1 quickly and completely absorbs and shows that the newly packaged asconic surface layer 7 on the top of the geogrid 1 is tightly integrated with the existing asconic base layer 6 located below the geogrid 1 . As shown in FIG. 22, it is normal that a large amount of water present in the asphalt emulsion of the tack coat 5 should be removed by evaporation. However, the asphalt road reinforcement geogrid 1 (1) containing the superabsorbent nonwoven fabric 3 according to the present invention ), The nonwoven fabric 3 can quickly and sufficiently absorb moisture in the tack coat 5 to promote dry curing of the tack coat 5. 22, a plurality of arrows directed from the tack coating 5 toward the nonwoven fabric 3 of the geogrid 1 indicate that the moisture in the tack coating 5 is absorbed by the nonwoven fabric 3 and removed. In FIG. 22, reference numeral 2a denotes a fiber rib disposed in a first direction in the grid 2 of the geogrids 1, 2b denotes a second direction perpendicular to the first direction fiber ribs 2a Gt; rib < / RTI >

The geogrid for reinforcing the asphalt road including the superabsorbent nonwoven fabric according to the present invention can quickly absorb the moisture in the tack coat at the time of reinforcing the asphalt paved road, thereby accelerating the curing time of the tack coat. As a result, It is possible to speed up the repair work. In addition, the geogrid according to the present invention can prevent delamination by perfectly bonding the aspheric surface layer with the lattice net made of a fiber material having high rigidity such as glass fiber and bar-suit fiber through the impregnated asphalt resin coating layer, Since the aggregates of the surface layer are sandwiched between the holes of the fiber mesh network, it is possible to prevent the aggregate from moving even by the repeated load of the vehicle, thereby greatly reducing the plastic deformation of the asphalt road.

1: Geogrid 2 for reinforcing asphalt roads: Fiber grid network
2a: first direction fiber ribs 2b: second direction fiber ribs
3: nonwoven fabric 3a: ribbed nonwoven fabric portion
4: Silica powder 5: tack coating
5a: tack coating surface 6: ascon substrate
7: Surface of Ascon 7a: Surface of existing Ascon
7b: surface layer removal portion
7c: Asphalt road at the repair work site
7d: surface layer incision surface 8: prime coating layer
9: Supporting layer 9a: Road bed
10: longitudinal fiber rib 11: first longitudinal fiber yarn
11a, 12a: fiber filament 12: second longitudinal fiber yarn
20: transverse fiber rib 21: transverse fiber yarn
30: intersection part 30a: intersection part bottom
30b: bending portion 30c: bending inclined portion
31: lattice hole 35: binding fine fiber
40: coating liquid impregnating part 41: asphalt resin coating layer
42: Adhesive layer 60: Geogrid construction equipment vehicle
61: driver's seat 62: handle
63: front wheel 64: rear wheel
65: take-up machine 66: geogrid feed roll
66a: take-up roller 67: pressure roller
70: Road
100: Geogrid manufacturing system for asphalt reinforcement
101: Beam 102: Beam
103: Textile loom 104: Weft yarn supplier
105: fiber grid 106: first guide roller
107: second guide roller 110: coating unit
111: Impregnating roller 112: Asphalt composition for coating
113: coating liquid tank 120: drying unit
121a: upper heater / hot air 121b: lower heater / hot air
130: Silica spraying device 131: Hopper
132: Lower hopper body 133: Quantitative feed gear
140: Adhesive applying device 141: Adhesive storage tank
142: Adhesive solution 143: Squeegee
144: Adhesive application roller 150: Nonwoven supply roll
151: third guide roller 152: fourth guide roller
153: Compression roller 155: Nonwoven fabric binding device
160: Geogrid winding roll
200: Meltblown composite spinning nonwoven fabric manufacturing device
210: first extruder unit 211: hopper
211a: synthetic resin raw material chip 211b: first extruded molten resin
211c: first molten resin transfer line 212: extruder
213: Screw 214: Built-in heater
215: filter 216: metering pump
217: first molten resin transfer line 220: second extruder unit
221: hopper 221a: synthetic resin raw material chip
221b: second extruded molten resin 221c: second molten resin transfer line
222: extruder 223: screw
224: Built-in heater 225: Filter
226: metering pump 227: second molten resin transfer line
230: radiator 231: nozzle tube body
231a: separating wall 231b: cylindrical separating wall
232: nozzle part 232a: spinneret end
233: An air passage
234: Meltblown composite fiber filament
234-1: First thermoplastic polymer resin part 234-2: Second thermoplastic polymer resin part
234a: meltblown web 234b: squeezed meltblown web
240: mesh conveyor belt
241: driving roller 242: driven roller
243: intake device 244a: upper compression roller
244b: Lower pressing roller 245: Air flow
250: wound roll 261: first nozzle tube portion
262: second nozzle tube portion 263: first nozzle tube portion
264: second nozzle tube portion
300: Spunbond composite spinning nonwoven fabric Measure 310: First extruder unit
311, 321: hopper 311a, 321a: synthetic resin raw material chip
312, 322: extruder 315, 325: filter
316, 326: metering pump 317, 327: valve
320: second extruder unit 330: radiator
331: Spinning nozzle 332: Radiator
333: Spunbond long filament filament 333a: Spunbond web
333b: spunbonded nonwoven fabric 334: stretching machine
340: mesh conveyor belt 340a: drive and support roller
340b, 340c, 340d: Support roller 342: Air flow
345: first conveyor belt 346: second conveyor belt
350: dryer 351: ten calender rolls
360: winding section 361, 362, 363: conveying roller
370: Winding roll 400: Nonwoven lamination device
403: third incoming guide roller 404: guide roller
410: Nonwoven web feed roll holder 411: First nonwoven web feed roll
411a: first nonwoven fabric 412: second nonwoven fabric supply roll
412a: second nonwoven fabric 413: third nonwoven fabric supply roll
413a: Third nonwoven fabric 420: conveying conveyor belt
421: driving roller 422: driven roller
423: first pressing roller 424: second pressing roller
425: third pressing roller 425a: receiving roller
430: joint portion 431a: upper guide roller
431b: Lower guide roller 440:
441: Nonwoven fabric winding roll 442:
450: laminated nonwoven fabric 451: lapped nonwoven fabric

Claims (16)

A plurality of longitudinal fiber ribs 10 arranged in a first direction and a plurality of transverse fiber ribs 20 arranged in a second direction perpendicular to the first direction, Lattice net (2);
The longitudinal fiber ribs 10 and the transverse fiber ribs 20 contained in the fiber grille net 2 are spaced apart from the adjacent longitudinal fiber ribs 10 and the transverse fiber ribs 20, A plurality of grid holes (31) formed in the region of the fiber grille (2) by being spaced apart;
The fibers constituting the fiber grating net 2 are impregnated with an emulsion of asphalt and a polymer resin material to form a coating layer 41 made of asphalt and polymer resin and formed to a thickness of 10 to 500 탆 on the surface of the fiber grating net 2, ;
Silica powders (4) covering at least one surface of the fiber grille net (2) by being attached to a coating layer (41) formed on the surface of the fiber grating net (2); And
And a nonwoven fabric (3) bonded to one surface of the fiber grille net (2)
The portions 30 where the longitudinal fiber ribs 10 and the transverse fiber ribs 20 meet and are surrounded and bound by the bundled fine fiber yarns 35 form the shape of the fibrous grid webs 2 to be fixed And,
The longitudinal fiber ribs 10 are composed of 2 to 4 fiber yarns and the transverse fiber ribs 20 are composed of 1 to 4 fiber yarns,
The fiber yarn is made of any one material selected from the group consisting of glass fiber, carbon fiber, aramid fiber, acrylic fiber, polyamide fiber, polyester fiber, polypropylene fiber and Vasart fiber, ~ 4,000 fiber filaments,
The nonwoven fabric (3) is formed of a web by integrating the fiber filaments produced by the meltblown composite spinning device (200). The cross-sectional shape of the fiber filaments in the radial direction is a sheath- Two polymer materials melted and extruded by side-by-side extruders 210 and 220 are combined and irradiated in the nozzle unit 232 of the radiator 230, The two polymeric materials in the cross-sectional structure in the radial direction are divided into boundaries, and the thickness of the fiber filaments is 1 to 10 탆, and the basis weight of the nonwoven fabric 3 is 25 to 400 g / m 2 , and an asphalt road geogrid reinforcement for containing the absorbent nonwoven fabric, characterized by. 2. The geogrid according to claim 1, wherein the silica sand powder (4) attached to the surface of the fiber grille net (2) has a particle size of 0.1 to 0.4 mm. 2. The method as claimed in claim 1, wherein the width of the longitudinal and transverse fiber ribs (10, 20) is 2 to 7 mm, the grid holes (31) have a quadrangular shape, Wherein the total area of the grid holes (31) in the total area of the geogrid (1) is 50 to 70%. The glass fiber filament according to claim 1, wherein at least one of the longitudinal fiber rib (10) and the transverse fiber rib (20) is made of glass fiber, the thickness of the glass fiber filament is 16.5 to 17.5 탆, And the number of the glass fiber filaments is 1, 000-1,300 g / km when 1 to 4,000 pieces of the glass fiber filaments are integrated so that the glass fiber yarn 1 Wherein the base has a tensile strength of 1,200 to 1,300 MPa and a modulus of elasticity of 122,000 to 126,000 MPa. The geogrid for reinforcing asphalt roads comprising a superabsorbent nonwoven fabric delete delete delete 2. The nonwoven fabric according to claim 1, further comprising an adhesive layer (42) present between the fiber grille (2) and the nonwoven fabric (3);
The adhesive layer 42 comprises 38 to 61% by weight of an acrylate copolymer modified polymer resin, 36 to 59% by weight of water and 1 to 5% by weight of other dispersant, and the viscosity of the adhesive is 200 to 2,200 cps , Geogrid for reinforcing asphalt roads with high absorptive nonwovens. The method according to claim 1, wherein the coating layer (41) is formed by impregnating a fiber grid net (2) with an asphalt resin coating liquid and drying the same,
The asphalt resin coating liquid contains 50.3 to 61.5% by weight of an asphalt emulsion as a first component, 23.1 to 35.7% by weight of a non-asphaltic resin emulsion as a second component, 5.0 to 13.4% by weight of a filler as a third component, ≪ / RTI > to 4.5 wt.% Of the total weight of the asphalt road. The asphalt emulsion according to claim 9, wherein the asphalt emulsion as the first component in the asphalt resin coating liquid composition has a volume fraction of 52 to 70% between the asphalt particulate components dispersed in water and water, Characterized in that a blown asphalt having a tensile strength of 10 to 40 is used as the asphalt. The asphaltic resin emulsion according to claim 9, wherein the asphaltic resin emulsion as the second component in the asphalt resin coating composition comprises 50 to 65% by weight of PVC acrylic latex, 5 to 15% by weight of internal plasticized PVC latex, 5 to 20% By weight of an ethylene-acrylic acid latex, and 5 to 17% by weight of an ethylene-acrylic acid latex. 10. The method according to any one of claims 1 to 9, wherein the coating layer (41) is formed by impregnating the fiber grid net (2) with an asphalt resin coating solution and drying the same,
The asphalt resin coating liquid composition comprises 50.3 to 61.5% by weight of an asphalt emulsion, 23.1 to 35.7% by weight of a nonphosphorous resin emulsion, 5.0 to 13.4% by weight of a filler, 0.3 to 0.8% by weight of carbon black, 0.2 to 0.7% Characterized in that the non-woven fabric comprises a high absorbency non-woven fabric comprising 0.3% to 0.7% by weight of a non-ionic surfactant, 0.3% to 0.8% by weight of a nonionic surfactant, 0.2% . delete By arranging a plurality of longitudinal fiber ribs (10) in a first direction and arranging a plurality of transverse fiber ribs (20) in a second direction intersecting at right angles to the first direction, );
A second coating layer 41 made of asphalt and polymer resin having a thickness of 10 to 200 탆 is formed on the surface of the fiber grille net 2 by impregnating the fiber grating net 2 with a coating liquid composed of asphalt and a polymer resin emulsion, step;
A third step of allowing the silica sand powders 4 to adhere to the surface of the fiber grille net 2 by including silica sand powders 4 on the coating layer 41;
A fourth step of applying an adhesive to the bottom surface of the fiber grille net 2; And
And a fifth step of attaching the nonwoven fabric 3 to the bottom surface of the fiber grille net 2,
The longitudinal fiber ribs 10 and the transverse fiber ribs 20 contained in the fiber grille net 2 are spaced apart from each other from adjacent longitudinal fiber ribs and transverse fiber ribs, A plurality of grid holes 31 are formed in the region of the grating net 2,
The longitudinal fiber ribs 10 are composed of 2 to 4 fiber yarns, the transverse fiber ribs 20 are composed of 1 to 4 fiber yarns,
When performing the first step using the loom 103, the loom 103 splits the intersecting portions 30 of the longitudinal fiber ribs 10 and the transverse fiber ribs 20 into bundled fine-line fibers 35 ), ≪ / RTI >
The fiber yarns constituting the longitudinal fiber ribs 10 and the transverse fiber ribs 20 may be glass fibers, carbon fibers, aramid fibers, acrylic fibers, polyamide fibers, polyester fibers, And a knotted fiber,
The nonwoven fabric 3 is formed of a web by integrating the fiber filaments produced by the meltblown composite spinning apparatus. The cross-sectional shape of the filament in the radial direction is a sheath-core type or a side by side and the two polymer materials melted and extruded by the respective extrusion apparatuses 210 and 220 are combined and radiated in the nozzle unit 232 of the radiator 230, Wherein the fibrous filaments have a thickness of 1 to 10 mu m and the basis weight of the nonwoven fabric is 25 to 400 g / m < 2 > A method for manufacturing a geogrid for reinforcing an asphalt road including a nonwoven fabric. By arranging a plurality of longitudinal fiber ribs (10) in a first direction and arranging a plurality of transverse fiber ribs (20) in a second direction intersecting at right angles to the first direction, );
A second coating layer 41 made of asphalt and polymer resin having a thickness of 10 to 200 탆 is formed on the surface of the fiber grille net 2 by impregnating the fiber grating net 2 with a coating liquid composed of asphalt and a polymer resin emulsion, step;
A third step of allowing the silica sand powders 4 to adhere to the surface of the fiber grille net 2 by including silica sand powders 4 on the coating layer 41;
A fourth step of applying an adhesive to the bottom surface of the fiber grille net 2; And
And a fifth step of attaching the nonwoven fabric 3 to the bottom surface of the fiber grille net 2,
The longitudinal fiber ribs 10 and the transverse fiber ribs 20 contained in the fiber grille net 2 are spaced apart from each other from adjacent longitudinal fiber ribs and transverse fiber ribs, A plurality of grid holes 31 are formed in the region of the grating net 2,
The longitudinal fiber ribs 10 are composed of 2 to 4 fiber yarns, the transverse fiber ribs 20 are composed of 1 to 4 fiber yarns,
When performing the first step using the loom 103, the loom 103 splits the intersecting portions 30 of the longitudinal fiber ribs 10 and the transverse fiber ribs 20 into bundled fine-line fibers 35 ), ≪ / RTI >
The fiber yarns constituting the longitudinal fiber ribs 10 and the transverse fiber ribs 20 may be glass fibers, carbon fibers, aramid fibers, acrylic fibers, polyamide fibers, polyester fibers, And a knotted fiber,
The nonwoven fabric (3) is a multi-layered nonwoven fabric produced by laminating at least three layers of spunbond nonwoven fabrics produced by a spinning-bonded composite spinning device and a nonwoven fabric produced by a meltblown composite spinning device, Wherein the meltblown composite radial nonwoven fabric is disposed at the center of the multi-layer structure, and the spunbond composite radial nonwoven fabric is disposed on the upper and lower surfaces of the meltblown composite radial nonwoven fabric. Way. (a) a first step of crushing, cutting and removing a surface layer of a road against a breakage occurrence area including a pothole, a crack or a wheel pavement of an asphalt pavement;
(b) a second step of cleaning the asbestos base layer 6 or the intermediate layer exposed by the operation of the first step by using high-pressure air and arranging the bottom surface flat;
(c) performing a tack coat (5) by applying an asphalt emulsion on the bottom surface using a distributor;
(d) placing the geogrid 1 integrated with the superabsorbent nonwoven fabric on the bottom surface of the tack coat 5 so as to allow the moisture in the tack coat to be absorbed into the superabsorbent nonwoven fabric within 5 to 20 minutes, ; And
The asphalt mixture is formed by mixing a mixture of asphalt and aggregate. The asphalt mixture is heated at a temperature of 150 to 180 占 폚 at the time of laying the asphalt mixture , And a fifth step of maintaining
The geogrid 1 includes a plurality of longitudinal fiber ribs 10 arranged in a first direction and a plurality of transverse fiber ribs 20 arranged in a second direction perpendicular to the first direction A fiber lattice net 2 made by joining in a lattice form; The longitudinal fiber ribs 10 and the transverse fiber ribs 20 contained in the fiber grille net 2 are spaced apart from each other from adjacent longitudinal fiber ribs and transverse fiber ribs, A plurality of grid holes (31) formed in the region of the grating net (2); The fibers constituting the fiber grating net 2 are impregnated with an emulsion of asphalt and a polymer resin material to form a coating layer 41 made of asphalt and polymer resin and formed to a thickness of 10 to 500 탆 on the surface of the fiber grating net 2, ; Silica powders (4) covering at least one surface of the fiber grille net (2) by being attached to a coating layer (41) formed on the surface of the fiber grating net (2); And a nonwoven fabric (3) bonded to one surface of the fiber grille net (2), wherein portions (30) where the longitudinal fiber ribs (10) and the transverse fiber ribs (20) The longitudinal fiber ribs 10 are composed of 2 to 4 fiber yarns and the transverse fiber ribs 20 are surrounded by and surrounded by the fine fiber yarns 35, ) Is composed of one to four fiber yarns, and the fiber yarn is composed of glass fiber, carbon fiber, aramid fiber, acrylic fiber, polyamide fiber, polyester fiber, polypropylene fiber, , And one fiber yarn is composed of 100 to 4,000 fiber filaments,
The amount of the tack coating 5 applied to the bottom surface in the third step is 1 to 5 mm,
The nonwoven fabric 3 is formed of a web by integrating the fiber filaments produced by the meltblown composite spinning apparatus. The cross-sectional shape of the filament in the radial direction is a sheath-core type or a side by side and the two polymer materials melted and extruded by the respective extrusion apparatuses 210 and 220 are combined and radiated in the nozzle unit 232 of the radiator 230, Wherein the fibrous filament has a thickness of 1 to 10 mu m and the basis weight of the nonwoven fabric is in a range of 25 to 400 g / m < 2 > Repair and Reinforcement Method of Asphalt Road Using Geogrid for Reinforcing Asphalt Roads Containing High Absorbent Nonwovens.

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