JP3155697B2 - Road reinforcing sheet, method of manufacturing the same, and method of reinforcing a road using the sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet for reinforcing a road used in asphalt road pavement, a method for producing the sheet, and a method for reinforcing a road using the sheet.

[0002]

2. Description of the Related Art In recent years, an increase in traffic on roads and an increase in traffic on large vehicles have resulted in damage to road pavements, thereby impairing driving safety and comfort. Road pavement on heavy traffic routes is severely damaged by rutting and cracks due to asphalt flow, and traffic congestion due to repair work has become a social problem. In addition, cracks progress from the roadbed to the surface layer due to rainwater intrusion into the roadbed through gaps in the gutters, water leakage from the buried pipe joints into the roadbed, or breakage of the roadbed due to load. This is called reflection crack, and when cracks occur on the surface layer, rainwater enters from the cracks, further damaging the roadbed, and promoting cracks. In bridge surface pavement, water that penetrates into the reinforced concrete slab from the bridge surface through asphalt pavement not only corrodes the reinforcing steel and steel inside the slab, but also deteriorates the concrete, especially the slab concrete under repeated loading. Promotes load-bearing capacity and durability.

Various methods and compositions have been proposed to enhance the overlay of asphalt paved roads,
In recent years, from the viewpoint of cost reduction and resource saving, for example, Japanese Patent Application Laid-Open Nos. Sho 62-268413 and
As shown in Japanese Patent Publication No. 415, a so-called geotextile method has been receiving attention. In the conventional geotextile method, a geotextile is laid on a subgrade, and a granular material such as embankment material or gravel is laid on the geotextile to form a pavement roadbed, thereby dispersing and supporting a load applied to the pavement.
However, it has little effect on damages such as rutting and cracking that occur on the surface of asphalt pavement. In addition, since conventional geotextiles are sandwiched between an underlay layer and an overlay layer, the two layers are formed in a grid form in order to prevent slippage. However, there is a disadvantage that collapse of the roadbed cannot be prevented. Further, a rigid plastic grid or a grit made of glass fiber, which is a conventional technique, has a high rigidity in order to increase the material strength, and cannot be unwound continuously, which makes mounting difficult.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and is excellent against damages such as rutting and cracking which occur on the surface of asphalt pavement, and prevents rainwater from entering the lower layer. An object of the present invention is to provide a sheet for road reinforcement capable of integrating an underlay layer and an overlay layer by a normal construction method without using an adhesive on a joint surface, a method for manufacturing the same, and a method for reinforcing a road using the same. It is assumed that.

[0005]

Means for Solving the Problems The present inventors have made intensive studies to achieve the above object, and as a result, have completed the present invention. That is, the present invention provides a laminate in which a plurality of fiber-reinforced thermoplastic resin sheets (hereinafter, sometimes referred to as prepregs) each containing 30% by volume or more and 85% by volume or less as long fibers that are substantially uniformly aligned in one direction are reinforced fibers. A sheet for road reinforcement characterized by laminating an asphalt layer on one or both sides of a sheet (hereinafter also referred to as a reinforced sheet), asphalt only on asphalt or laminating with asphalt on one or both sides of the laminate A sheet for road reinforcement, characterized in that both are heated and joined at a temperature not lower than the melting temperature of the thermoplastic resin used for the fiber-reinforced thermoplastic resin sheet, pressurized and cooled, solidified and integrated to form a sheet. And the road reinforcing sheet is laid on the asphalt pavement to be reinforced so as to be on the roadbed or the base layer, and an adhesive is used. Integrating the sheet and the base layer and surface layer road reinforcement or by pressure rolling heating an asphalt pavement surface layer to a tempering method of the road, characterized in that strengthening.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The prepreg of the present invention contains reinforcing fibers having a volume content of 30% or more and 85% or less, and the reinforcing fibers are uniaxially continuous long fibers almost uniformly aligned. . Typical fibers used for the prepreg include, for example, glass fiber, carbon fiber, aramid fiber, and silicon carbide fiber, but are not limited thereto. Particularly preferred fibers include glass fibers. As the fiber, a yarn or a roving in which 200 to 12,000 monofilaments having a thickness of 3 to 25 μm are bundled are usually arranged in a predetermined number in one direction. When the fibers are glass fibers, various surface treatments are usually performed to improve the adhesion to the resin. Surface treatment is
This is performed by combining a sizing agent and a coupling agent.

[0007] The thermoplastic resin used for the prepreg is not particularly limited. For example, polypropylene, polyethylene, ethylene-propylene copolymer, polyolefin resins such as α-olefin homopolymers and copolymers, styrene, homopolymers such as methylstyrene and polystyrene resins such as copolymers thereof with α-olefins, A polyvinyl chloride resin such as a homopolymer of vinyl chloride or a copolymer of this with an α-olefin can be used. Other, AS resin, ABS resin, AS
A resin (polyacrylonitrile / polystyrene / polyacrylate resin), polymethyl methacrylate,
Nylon, polyacetal, polycarbonate, polyethylene terephthalate, polyphenylene oxide, fluororesin, polyphenylene sulfide, polysulfone,
Various resins such as polyethersulfone, polyetherketone, polyetheretherketone, polyimide, and polyarylate can also be used. Strength, wear resistance,
From the viewpoints of price and ease of recycling when it becomes waste, general-purpose polyolefin resins such as polyethylene and polypropylene, polystyrene resins, and polyvinyl chloride resins are recommended as the most desirable resins.

[0008] The prepreg is produced by impregnating a reinforcing fiber with a thermoplastic resin aligned in one direction. Although there are various means as such a method, the most common method is as follows. One is a method in which, if the resin is soluble in a solvent, the resin is converted into a solution to impregnate the reinforcing fibers, and then the solvent is removed while defoaming to form a prepreg. The other is a method in which a resin is heated and melted to impregnate the reinforcing fibers, defoamed, and cooled to form a prepreg.

As a specific example of a method for producing a prepreg, there is a method disclosed in Japanese Patent Publication No. 04-42168. According to this method, in the case of glass fiber, for example, the surface of a monofilament having a thickness of 13 μ is treated with γ-methacryloxy-propyltrimethoxysilane,
The 1,800 yarns are bundled to form a twist-free yarn, and the yarns are aligned in one direction while being pulled with a uniform tension, the resin is entangled with the yarn, and the yarn is impregnated into the yarn while being squeezed with a hot roll. Can be manufactured.

[0010] The prepreg thus produced has excellent adhesion between the fiber and the thermoplastic resin, and has a fiber content of 30-9.
0% by weight and can be changed as required.
In the present invention, the glass content is 30 to 85% by volume and the thickness is 0.1 to 1.0 mm.
It is used at the place of 05-0.6 mm. If the glass fiber content is less than 30% by volume, the strength is low because the amount of fibers is small, and if it exceeds 85% by volume, the amount of resin is small with respect to the fibers, and the adhesion between the fibers and the resin is reduced, and the strength is undesirably reduced. .

When a reinforced sheet is prepared by laminating a plurality of prepregs, the prepregs can be laminated in any direction of 0 to 90 degrees with respect to the reinforcing fiber direction of the first prepreg.
This lamination direction can determine the structural strength according to the intended use and set the orientation angle of the reinforcing fiber of each prepreg, but the direction of the reinforcing fiber of all the laminated layers does not become 0 degree. Is preferred. The thickness of the reinforced sheet is preferably 0.1 to 2 mm. When the thickness of the reinforced sheet is 0.05 mm or less (for one sheet), only a tensile strength in one direction is obtained, and when the thickness exceeds 2 mm, the sheet becomes hard, cannot be unwound continuously, and construction becomes difficult.

Lamination is performed by heating and pressing a plurality of prepregs at a temperature equal to or higher than the melting point of the thermoplastic resin to form a reinforced sheet. The heating temperature and time vary depending on the type of resin and the number of layers. For example, when four layers of a polypropylene-based prepreg having a thickness of 0.2 mm are used, usually 170 to 220
0.1 to 0.5 minutes at ° C. Pressure is usually 0.1-10
kg / cm ^2, preferably not 0.1 to 5 kg / cm ^2, more preferably a 0.1~2kg / cm ^2. When the molding pressure is less than 0.1 kg / cm ^2, degassing tends to be insufficient, and when it exceeds 10 kg / cm ² , the linearity of fibers arranged in one direction is undesirably disturbed.

In the present invention, a woven or nonwoven fabric made of fibrous material may be arranged on the entire surface or on one or both sides of the laminate in which the prepregs are laminated. The woven or non-woven fabric used is generally made of a material other than a polymer material, or made of a short polymer fiber, but is usually a high-density polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride. , Polystyrene, polyvinyl alcohol, polyester, and various copolymers thereof can be used. By applying such a fibrous woven or nonwoven fabric, the adhesion between the reinforcing sheet and the asphalt layer is further increased.

The material constituting the asphalt layer used in the road reinforcing sheet used in the present invention is classified into natural asphalt and petroleum asphalt, and petroleum asphalt is particularly recommended. Petroleum asphalt is produced from distillation residue in the process of refining petroleum crude oil, and is mainly composed of two types: straight asphalt and blown asphalt.

If crude oil is subjected to a normal pressure or reduced pressure distillation apparatus to distill low boiling components, asphalt remains, and this is straight asphalt. Blow asphalt is hard asphalt obtained by heating straight asphalt, sufficiently blowing air, and oxidizing and polymerizing.
The standard for blown asphalt is shown in JIS K2207. The types are classified according to the penetration,
5, 5 to 10, 10 to 20, 20 to 30, and 30 to 40 are standardized. Add or mix animal and vegetable fats and oils or their fatty acid pitch to blown asphalt,
Alternatively, asphalt compound is one in which the quality is improved by adding these additives in the process of producing blown asphalt. The hardness of general commercially available asphalt compounds is mostly in the range of 20 to 40 penetration. In the present invention, all of these blown asphalts and asphalt compounds can be used.

In view of the form of the pavement material as a bituminous material, petroleum asphalt includes petroleum asphalt, petroleum asphalt emulsion, cutback asphalt, and modified asphalt, and all of them are used in the present invention. Can be. The paving petroleum asphalt is straight asphalt of JIS K2207 petroleum asphalt, and the quality conforms to the regulations.

The petroleum asphalt emulsion is a brown liquid obtained by dispersing asphalt as fine particles of 1 to 5 μm in water. Emulsions are roughly divided into anionic emulsions, cationic emulsions, and clay-type emulsions.
There is also an inverted emulsion in which water is dispersed in asphalt. In the anionic emulsion, the surface of asphalt particles has a negative charge. In a cationic emulsion, the surface of asphalt particles has a positive charge. The clay type emulsion is obtained by dispersing and emulsifying asphalt using a partially water-soluble inorganic substance, and generally uses bentonite. The standard of petroleum asphalt emulsion is JIS K22
08, and all that comply with this standard can be used in the present invention.

Cutback asphalt is obtained by adding a petroleum distillate as a solvent to asphalt to reduce the viscosity, and has a rapidly hardening RC and a neutral MC. The cutback asphalt standard is listed in the asphalt pavement guidelines and is applied for pavement. The types are RC and MC, each of which is graded by kinematic viscosity. Anything that conforms to this standard can be used in the present invention.

The modified asphalt is obtained by using asphalt as a raw material and adding an improving material such as rubber and resin to the asphalt, and this can also be used in the present invention. The rubber added to the asphalt is usually a synthetic rubber, such as a styrene butadiene copolymer, a chloroprene butadiene nitrile copolymer, an isobutylene isoprene copolymer, or the like. The amount of rubber added is generally 2-5% by weight.

In order to manufacture the road reinforcing sheet of the present invention, the melting temperature of a thermoplastic resin using asphalt alone or both asphalt and the reinforcing sheet for the reinforcing sheet on one or both sides of the above-mentioned reinforcing sheet. The sheets are joined by heating as described above, and then cooled and solidified under pressure to be integrated into a sheet.

As a method of integrating the reinforced sheet and the asphalt by heat welding, as a method of heating the reinforced sheet heated above the melting temperature of the thermoplastic resin of the reinforced sheet or the reinforced sheet not heated to the molten asphalt heated above the melting temperature of the thermoplastic resin. Examples thereof include a method of applying asphalt to the laminate by a dipping method, a roll coating method, and the like. When the asphalt emulsion is applied, the reinforcing sheet having a woven or nonwoven fabric made of fibrous material on one or both sides of the reinforcing sheet is heated and dipped into a molten asphalt emulsion, and the fiber is coated by a roll coating method or the like. And a method of impregnating a woven or non-woven fabric of quality and joining and integrating them.

As for the heating of the reinforced sheet and the asphalt material, the reinforced sheet and the asphalt material can be heated without contacting each other, or the reinforced sheet can be placed on the asphalt and heated in a state where they are in contact with each other. According to such a method, the thermoplastic resin of the reinforced sheet and the thermoplastic resin of the asphalt layer can be melted or mixed with each other, solidified and integrated, and thus can be joined without using an adhesive. However, the reinforced sheet contains fibers such as glass fiber, and the linear expansion coefficient of the reinforced sheet and asphalt are different. If cooled as it is after fusion welding, the reinforced sheet and asphalt will peel off. It is necessary to maintain pressure until solidification by applying pressure during cooling. At this time, it is necessary to degas air existing between the sheet layers of the reinforced sheet.
Pressurized with ² or more 3 kg / cm ² or less of pressure degas.
If the pressure is in this range, the sheet will not be crushed, and thus the deaeration can be performed in the step of integrating with the asphalt layer. As a matter of course, it is possible to use a material which has been deaerated in advance and cooled to form a laminate.

The thickness of the road reinforcing sheet manufactured as described above is preferably 0.5 to 5.0 mm. If the thickness of the road reinforcing sheet is less than 0.5 mm, the amount of asphalt is small and the adhesive strength is weak, and if it exceeds 5.0 mm, the amount of asphalt is too large, causing bleeding of asphalt components and cracking due to elasticity.

Next, a method for reinforcing a road using the road reinforcing sheet of the present invention will be described. The structure of a normal asphalt pavement is composed of a roadbed, a base layer, and a surface layer in this order on the roadbed, but there is a case where the surface layer is directly constructed on the roadbed without the base layer. When the ground is soft ground, etc., the asphalt stabilization method is used in which asphalt (straight asphalt, asphalt emulsion, cutback asphalt, etc.) is added to a local material or a material obtained by adding a supplementary material thereto on a subgrade to treat the material. In some cases. The subgrade is a part with a thickness of 1 m below the pavement. In the embankment part, 1 m below the excavated surface in the cut part.
This is the part. The subgrade is the basis for determining the thickness of the pavement.

The roadbed is a layer that distributes the traffic load and safely transmits it to the roadbed. Therefore, the material must have a sufficient supporting force and be made of a highly durable material and be compacted to the required thickness. In order to balance the roadbed economically and mechanically, the roadbed is usually divided into a lower roadbed made of inexpensive material with relatively low bearing capacity and an upper roadbed made of high-quality material with large bearing capacity. Work. The materials used for the lower roadbed and the upper roadbed include local materials, crushed stone, crusher lance lugs, mountain gravel, cutting gravel or sand.

The surface layer and the base layer are the parts most affected by traffic loads and weather effects, and use a heated asphalt mixture. As the type of the heated asphalt mixture, coarse-grained asphalt concrete is used for the base layer, and fine-grained asphalt concrete, fine-grained asphalt concrete, and dense-gap asphalt concrete are used for the surface layer. When selecting a mixture, the mixture is determined in consideration of weather conditions, traffic conditions, construction conditions, and the like.

The pavement using the road-reinforcing sheet of the present invention may be laid on a roadbed or on a base layer. This is determined in consideration of the configuration of the road, use, construction conditions, and the like. When laying on a roadbed, after laying the roadbed material and performing sufficient compaction, a road paving sheet is laid on the roadbed. In this case, since the bonding with the roadbed material is not performed, it is possible to lay the roadbed material without restriction on the temperature conditions and the like. Next, the base layer and the surface layer or only the surface layer is laid on the road reinforcing sheet. Alternatively, a stable treatment road layer is laid on a road reinforcing sheet, and a base layer and a surface layer or only the surface layer is laid thereon. In this case, the construction is performed under such a condition that the temperature of the base layer, the surface layer or the stabilization layer in contact with the road reinforcing sheet is 110 ° C. or higher.

When laying on a base layer, first, coarse-grained asphalt concrete is laid on a roadbed with an asphalt finisher or the like, and is compacted using an iron wheel roller or a tire roller, and then compacted by pressure. Will be laid. The temperature of the base layer after pressure rolling is usually 1
10 ° C. or higher. At this temperature, the sheet for road reinforcement is laid directly and the sheet is melted by the heat of the base layer and adheres to the base layer. However, when the temperature of the base layer after the pressure rolling is 110 ° C. or lower, the road reinforcing sheet is laid while directly heating the road reinforcing sheet by a direct fire such as a torch burner to melt and adhere the sheet to the base layer. . When laying the surface layer after completing the laying of the road reinforcement sheet, the temperature of the asphalt concrete must be at least 110 ° C.
If the temperature is lower than 110 ° C, do not apply. After the surface layer is laid, the heat is transmitted to the base layer by using an iron wheel roller and a tire roller for compaction, the asphalt is melted, and the base layer, the sheet for road reinforcement and the surface layer are firmly integrated.

In any case, it is preferable that the seam of the road reinforcing sheet is overlapped by about 10 cm and the road reinforcing sheet is directly heated by a direct fire such as a torch burner to melt and bond the sheet to the sheet. Road reinforcement sheet is 1-2
It is recommended to spread one sheet. If three or more sheets are laid, the elasticity of the sheets may cause cracks on the surface layer.

The pavement reinforced by the road reinforcing sheet of the present invention has twice or more the durability compared to the ordinary pavement in terms of the rutting and cracking phenomena occurring on the road surface. Further, the road reinforcing sheet of the present invention is compatible with asphalt pavement, and the asphalt of the road reinforcing sheet melts at the asphalt temperature (usually 110 ° C. or higher) during construction to form a good bonding surface with the asphalt pavement, Because they are integrated, a strong pavement surface can be formed.
In addition, by exhibiting the adhesive effect, the flow of asphalt is suppressed, and the deflection of the pavement is reduced, and the phenomenon of rutting and cracking is suppressed.

Further, by using an iron wheel roller and a tire roller for compaction in the surface layer construction, heat is transmitted to the base layer, the asphalt is melted, and the base layer, the road reinforcing sheet and the surface layer are firmly integrated. Further, the sheet for reinforcing roads of the present invention also has a waterproof function as a composite waterproof sheet, and has excellent performance even in places having waterproof performance such as prevention of reflection cracks and pavement on bridge surfaces.

[0032]

The present invention will be described in more detail with reference to specific examples. Example 1 [Manufacture of prepreg] The reinforced sheet used in this example was manufactured to have a width of 650 mm by the method disclosed in Japanese Patent Publication No. 04-042168. In the case of glass fiber, the surface of a monofilament having a thickness of 13 μm is treated with γ-methacryloxy-propyltrimethoxysilane, and 1800 of them are bundled into a twist-free yarn. The resin was entangled with the yarn, and the resin was squeezed with a hot roll and impregnated into the yarn to produce a reinforced sheet. In the case of carbon fiber, 12,000 monofilaments having a thickness of 7μ are collected without using a sizing agent, and 80 tows are aligned in one direction while pulling 80 with uniform tension, and the resin is entangled with the yarn. While ironing with a hot roll,
Manufactured by impregnating the yarn. Table 1 shows the configuration of the reinforced sheet manufactured. A to F in the table indicate that the compounding ratio of the fibers is 40%.
Above, 80% or less, that is, according to the present invention,
G and H are out of the above range, that is, tested as comparative examples.

[0033]

[Table 1]

[Production of Reinforced Sheet] A plurality of prepregs were laminated to form a reinforced sheet. The prepreg having a thickness of 0.2 mm obtained in Example 1 was superimposed on the second prepreg in a direction of 90 degrees with respect to the reinforcing fiber direction of the first prepreg and adhered to each other, and heated to 180 ° C. The above-mentioned material is put on a board, contact-heated at a pressure of 0.2 kg / cm ² , heat-pressed for 20 seconds, and then pressurized and cooled in a press heated to 70 ° C. for a pressure of 0.2 kg / cm ² for 30 seconds. did. When the number of laminations is two or more, the lamination direction is always such that the reinforcing fiber direction is 90 degrees, and the heating time is 1 to 2 to 4 layers.
The heating is performed in 0 to 30 seconds, and in the case of 5 to 10 layers, in 30 to 60 seconds. Cooling time is 10 to 30 seconds for 2 to 4 layers, and 5 to 10
In the case of a layer, it is pressurized and cooled in 30 to 120 seconds. The pressure at this time was all 0.2 kg / cm ² .

[Manufacture of Road Reinforcement Sheet] The asphalts used were straight asphalt, blown asphalt and modified asphalt, and their properties are shown in Table 2.

[0036]

[Table 2]

The road reinforcing sheet having asphalt laminated on both sides was manufactured by the apparatus shown in FIG. While heating the reinforced sheet laminate 12 from both sides to 180 ° C. or higher with infrared heaters 16 at a speed of 5 m / min, the reinforced sheet laminate 12 is passed through a bat 26 filled with straight asphalt 11 heated to 200 ° C. to apply asphalt, It passed between the heating rolls 17 heated to 180 ° C., and then passed between the cooling rolls 18 heated to 60 ° C. while adjusting the thickness to cool. The thus obtained road reinforcing sheet 1B had no curl, had a uniform thickness, and was flexible. The structure of this sheet is shown in FIG.

A road reinforcing sheet having asphalt laminated on one side was manufactured using the apparatus shown in FIG. While heating the reinforced sheet laminate 12 from one side to 180 ° C. or more with the infrared heater 16 at a speed of 5 m / min, 20
A straight asphalt 11 heated to 0 ° C. is applied by a roll coater 25, and a heating roll 1 heated to 180 ° C.
7 and then cooled between cooling rolls 18 heated to 60 ° C. while adjusting the thickness.
The thus obtained road reinforcing sheet 1A had no curl, had a uniform thickness and was flexible. The structure of this sheet is shown in FIG.

FIG. 3 is a cross section of the road reinforcing sheet of FIG. It can be seen that at the boundary surface between the reinforcing sheet 12 and the asphalt layer 11, the resin 15 of the reinforcing sheet bites between the asphalt grains 11 and is thermally fused to form a strong joint surface. Tables 3 and 4 show the structure and properties of the road reinforcing sheet thus obtained. Table 3 is within the scope of the invention and Table 4 is for comparison outside the scope of the invention.

[0040]

[Table 3]

[0041]

[Table 4]

[0042]

[Table 5]

[Evaluation of Road Reinforcement Sheet] The road reinforcement sheet was subjected to the following tests. Table 5 shows the results. Tensile strength test: According to JIS K6301 vulcanized rubber physical test method. Flexibility: Width of asphalt and reinforced sheet laminate 20
A test piece having a length of 30 mm and a length of 30 mm was used as a fixed cantilever on one side, and a load was applied to the opposite side. ◎: 0 kg (no load) ○: Less than 0.5 kg ×: 0.5
kg or more Peeling test: Peeling strength per 1 cm width was measured at the joint surface between prepregs. ◎: 1.0 kg / cm or more ○: 0.5 kg / cm or more ×: 0.
Less than 5 kg / cm Impact resistance test: According to JIS K7211. ◎… No abnormality ○… Crack ×… Destruction

[0044]

[Table 6]

[0045]

[Table 7]

[0046]

[Table 8]

Example 2 A pavement test was conducted using the road reinforcing sheet of the present invention.
FIGS. 5 to 7 show sectional views of the pavement configuration in the construction test. Vertical 10
Approximately 80 cm was dug down in the section of 12 m wide and 12 m wide. A 40 cm lower roadbed 24 was formed on the roadbed by a crusher run, and a 25 cm upper roadbed 23 was further formed thereon using granulated stone.

A pavement test was performed on the roadbed. Thickness 5 to create a condition where the subgrade softens on the upper subgrade
cm styrofoam plate 22 was spread. This test section is vertically divided into three sections (4 m, 4 m, 4 m), and the first section (4 m width × 10 m length) has an asphalt stabilization treatment layer 21 of 8 cm and a base layer 20 of asphalt concrete as shown in FIG. Was 5 cm, the surface layer 19 was 5 cm, and a normal pavement was made without a road reinforcing sheet. As shown in FIG. 6, the second section (4 m wide × 10 m long) is provided with the sheet 1B for road reinforcement of the present invention laid on the roadbed, and the asphalt stabilizing layer 21 is 8 cm on the sheet 1B in the same manner as described above. Base layer 20 of asphalt concrete 5 cm, surface layer 1
9 was 5 cm, and the pavement was made. 3rd section (4m ×
As shown in FIG. 7, as shown in FIG. 7, the asphalt stabilizing layer 21 is formed on the roadbed by 8 cm, and the base layer 20 is formed by asphalt concrete by 5 cm, and then the road reinforcing sheet 1B of the present invention is laid and arranged thereon. The surface layer 19 was made 5 cm in the same manner as described above.

In all of the above asphalt concrete pavements, the production and shipping were carried out at 140 ° C., and those shipped were used. The two layers were spread by a normal asphalt finisher having a single tamper and a vibrating screed. And Rolling was performed with a large vibrating roller and a tire roller, and the rolling temperature was 110 ° C. In the test, 12 hours after the completion of pavement, the road was opened and the pavement surface was observed.
As a result, the crack generation time of the surface layer was earliest in the first section at 1.6 years, the second section was at 2.9 years, and the third section was 3.6 years.
It was the year. Average traffic volume after opening the road is 6 per day
There were 000 vehicles.

[0050]

Since the road reinforcing sheet of the present invention forms a good bonding surface with asphalt pavement and has a waterproof property, the pavement using the same can be used for rutting, cracking, etc. occurring on the surface layer of asphalt pavement. It is excellent against damage to the underlayer, prevents rainwater from entering the lower layer, and can integrate or strengthen the underlayer and the upper layer by a normal construction method without using an adhesive at the joint surface.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a road reinforcing sheet according to the present invention.

FIG. 2 is a perspective view showing another embodiment of the road reinforcing sheet according to the present invention.

FIG. 3 is a diagram showing a cross section of the road reinforcing sheet of FIG. 1;

FIG. 4 is a view schematically showing one embodiment of an apparatus for manufacturing a road reinforcing sheet of the present invention.

FIG. 5 is a sectional view of a general pavement configuration used for a construction test of the road reinforcing sheet of the present invention.

FIG. 6 is a cross-sectional view of a pavement structure in a construction test in which a road reinforcing sheet of the present invention is laid on a roadbed.

FIG. 7 is a sectional view of a pavement configuration in a construction test in which a sheet for reinforcing a road according to the present invention is laid below a surface layer.

FIG. 8 is a view schematically showing another embodiment of the apparatus for manufacturing a road reinforcing sheet of the present invention.

[Explanation of symbols]

 1A Road Reinforcement Sheet 1B Road Reinforcement Sheet 11 Asphalt 12 Fiber Reinforced Thermoplastic Sheet 13 Thermal Fusion Layer 15 Thermoplastic Resin 16 Heater 17 Heating Roll 18 Cooling Roll 19 Asphalt Concrete (Surface Layer) 20 Asphalt Concrete (Base Layer) 21 Asphalt Stabilization layer 22 Styrofoam plate 23 Grain crushed stone (upper roadbed) 24 Crusher run (lower roadbed) 25 Coating roll 26 Bat

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Atsushi Oka 3-5-2 Kasumigaseki, Chiyoda-ku, Tokyo Mitsui Toatsu Chemicals Co., Ltd. (56) References JP-A-3-76903 (JP, A) (58 ) Surveyed field (Int.Cl. ⁷ , DB name) E01C 11/16 E01C 7/18

Claims (10)

(57) [Claims] An asphalt layer is laminated on one side or both sides of a laminate obtained by laminating a plurality of fiber-reinforced thermoplastic resin sheets containing 30% by volume or more and 85% by volume or less as long fibers that are substantially uniformly aligned in one direction as reinforcing fibers. A sheet for road reinforcement characterized by being made. 2. A joint portion between a laminated body in which a plurality of fiber-reinforced thermoplastic resin sheets are laminated and asphalt is melted or mixed with each other and solidified without using an adhesive. The sheet for road reinforcement according to 1. 3. The road reinforcing sheet according to claim 1, wherein the thickness of the laminate formed by laminating a plurality of fiber-reinforced thermoplastic resin sheets is 0.1 to 2 mm. 4. The road reinforcement according to claim 1, wherein a woven or non-woven fabric made of fibrous material is provided on one or both surfaces of the laminated body in which a plurality of fiber-reinforced thermoplastic resin sheets are laminated. Sheet. 5. The road reinforcing sheet according to claim 1, wherein the reinforcing fibers are glass fibers, and the thermoplastic resin is a polyolefin resin, a polystyrene resin, or a polyvinyl chloride resin. 6. The road reinforcing sheet according to claim 1, wherein a paper, a resin film or a mineral sand is laminated on the surface of the asphalt for release. 7. The thickness of the sheet for reinforcing roads is 0.5 to 5 m.
2. The road reinforcing sheet according to claim 1, wherein m is m. 8. Asphalt is applied to one or both sides of a laminate obtained by laminating a plurality of fiber-reinforced thermoplastic resin sheets containing 30% by volume or more and 85% by volume or less as long fibers that are substantially uniformly aligned in one direction as reinforcing fibers. Only the asphalt and both of the asphalt and the laminate are joined by heating to a temperature higher than the melting temperature of the thermoplastic resin used for the fiber-reinforced thermoplastic resin sheet, and then pressurized, cooled, solidified and integrated to form a sheet. Manufacturing method of a road reinforcing sheet. 9. The road-reinforcing sheet according to claim 1 is laid on a roadbed, and only the asphalt surface layer or both the base layer and the surface layer is provided thereon, and the asphalt pavement surface without using an adhesive. A road reinforcing sheet and a surface layer or a road reinforcing sheet, a base layer and a surface layer by heating and compacting the road. 10. The road reinforcing sheet according to claim 1, which is laid on a base layer, an asphalt surface layer is provided thereon, and the asphalt pavement surface layer is heated and compacted without using an adhesive. A method for strengthening a road, comprising integrating a base sheet, a base layer and a surface layer.