JPH11200356A - Ground stabilizing agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground stabilizing agent being excellent in tension characteristics, creep characteristics, and pull-out resistance properties. SOLUTION: A long substance made of continuous inorganic fiber-reinforced thermoplastic resin is produced such that fiber-contained resin prepared by impregnating continuous fibers for inorganic reinforcement with thermoplastic resin. After a lattice-form substance is formed in a way that the long substance is arranged in a lattice-form state as a longitudinal material 7 and the lateral material 8, a longitudinal part 10, a lateral part 11, and an intersection part 9 are provided to weld the lattice-form substance. In this case, the thickness of the longitudinal part is 2.5 mm or less and the thickness of the lateral part is 1.0-10.0 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground stabilizing material comprising a continuous inorganic fiber reinforced thermoplastic resin elongated member.

[0002]

2. Description of the Related Art Conventionally, in the field of earth works such as land reclamation, roads, railways, etc., for the purpose of stabilization of soft ground, stabilization of embankment and prevention of arc slippage, compaction and removal of soil water, treatment with cement and lime. Had been done. Recently, unlike those methods, a reinforced earth method using a geotextile, which is a polymer material, is being utilized.

[0003] This reinforced earth method aims at strengthening the entire mass of soil by means of a tensile resistance as a reinforcing material of the geotextile and a frictional resistance with the soil, etc., thereby making construction relatively easy, shortening the construction period and reducing the weight of the soil structure. Can be possible. These geotextiles are in the form of a mesh for meshing with the ground to prevent slippage of the ground and for quickly removing water and the like that has penetrated into the soil.

[0004] Among geotextiles, geogrids that require high strength are mainly made of high-density polyethylene (HD).
It is obtained from a polymer material such as PE), polypropylene (PP), and polyethylene terephthalate (PET), and is also called a polymer grid. In general, such a geogrid is easily stretched and deformed, and the tensile strength at the time when it is stretched to about 15 to 20% acts most strongly, while the soil is drawn to 2 to 5%. The geogrid has the drawback that it cannot sufficiently prevent the ground from sliding at the initial stage when the soil starts to collapse because it has the property of starting to collapse when it is stretched and distorted. .

[0005] In order to solve such problems and provide high strength, high elastic modulus and high creep characteristics, a fiber grid obtained by reinforcing a thermosetting resin or a thermoplastic resin with continuous fibers and integrally forming it into a grid shape has been developed. It has been developed and is disclosed in Japanese Patent Application Laid-Open No. 7-173824. However, since the fiber grid is poor in flexibility and impact resistance, it cannot withstand bending stress when it is installed in a place with a lot of unevenness or a lot of rock, etc. Has the disadvantage of being damaged. On the other hand, Japanese Patent Application Laid-Open No. 5-23982
No. 2 discloses a ground reinforcing material in which a rib having a specific thickness in which a specific amount of continuous fiber is impregnated with a thermoplastic resin has a net shape. By this method, the reinforcing material could be made flexible, but the impact resistance could not be improved at all.

Further, in Japan, it is becoming difficult to secure land, so that there are many embankments with steep slopes such as steep embankments and retaining wall embankments. And other reinforcing materials cannot be made large enough to have a sufficient effect. Also, existing fiber grids have low pull-out resistance, so reinforcement work in soft ground where the laying area is not sufficient can only rely on conventional methods such as concrete retaining walls and masonry. Met.

[0007] Based on this fact, the present inventors have started development of a fiber grid, paying attention to tensile properties, creep properties and pull-out resistance.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to tensile properties,
An object of the present invention is to provide a ground stabilizing material having excellent creep characteristics and pull-out resistance.

[0009]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, have formed a lattice-like body using a continuous inorganic fiber reinforced thermoplastic resin elongated body having a specific structure as a constituent member. It has been found that a ground stabilizing material which achieves the object can be obtained by heat-welding the same, and the present invention has been achieved.

That is, the present invention relates to a continuous inorganic fiber reinforced thermoplastic resin elongated body obtained by coating a thermoplastic resin layer on a fiber-containing resin obtained by impregnating a continuous inorganic reinforcing fiber with a thermoplastic resin. A ground stabilizing material having a vertical portion, a horizontal portion, and an intersection portion formed by arranging a lattice-like body by arranging the lattice-like body as a material and a horizontal member, and then forming the lattice-like body by heat welding. The thickness of the vertical portion is 2.5 mm or less, and the thickness of the horizontal portion is 1.0 mm.
It is a ground stabilizing material characterized by being about 10.0 mm.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A continuous inorganic fiber reinforced thermoplastic resin long body (hereinafter, also simply referred to as "long body") used for a vertical member and a horizontal member of the present invention is a thermoplastic resin containing a thermoplastic resin. It is formed by coating a resin layer. The fiber-containing resin is obtained by impregnating continuous inorganic reinforcing fibers with a thermoplastic resin. Here, the elongate body is a generic term meaning that the length in the longitudinal direction is extremely long with respect to the length in the width direction. For example, the cross section in the width direction is an arbitrary shape such as a rectangle, a circle, an ellipse, and a triangle. Shape. For example, FIG. 1 shows an example in which the cross section in the width direction is rectangular. The elongated body 1 is obtained by coating a thermoplastic resin layer 5 on a fiber-containing resin 4 composed of an inorganic reinforcing fiber 2 and a thermoplastic resin 3.

The present invention is characterized in that a long body is arranged in a grid shape as a vertical member and a horizontal member to form a grid member, and then this is thermally welded. Here, the “lattice-like body” means that the intersection of the lattice is composed of one or more vertical members and one or more horizontal members. Therefore, the intersection of the present invention may be composed of one vertical member and one horizontal member, or one vertical member and one horizontal member.
It may be composed of a body, or a plurality of both materials may be used. In addition, the lattice-like body may be an arbitrary member other than the vertical member and the horizontal member if desired. For example, the long member is appropriately used as an oblique member so as to contact the vertical member and the horizontal member. You can also.

In the present invention, after forming the lattice-like body,
The grid-like body is physically welded to the vertical member and the horizontal member or the diagonal member of the grid-like member by heat welding. In the present invention, the intersections are thermally welded, but if they function as a net, it does not necessarily mean that all the intersections must be thermally welded, but it is preferable that all the intersections be thermally welded. In the heat welding according to the present invention,
The part to be heat welded is not limited to the intersection,
Cross members, vertical members, vertical members and horizontal members other than intersections can be appropriately selected. For example, as a preferred embodiment,
The intersection portion may have a structure in which both surfaces of the vertical member are sandwiched by the horizontal members and are welded to each other, and the horizontal portion may be a structure in which the horizontal members are thermally welded to each other.

FIGS. 2 and 3 show specific structural examples of the present invention. FIG. 2 is a view in which the lattice-shaped body of the present invention is formed in a plane, is thermally welded, and is viewed from a direction perpendicular to the plane. FIG. 3 is a diagram illustrating a cross section cut along a line AA in FIG. 2. In FIG. 2, a ground stabilizing material 6 of the present invention is formed by thermally welding a vertical member 7 and a horizontal member 8, and includes an intersection 9 (a portion surrounded by a dotted line), a vertical portion 10, and a horizontal portion 11. I have.

FIG. 3A shows an example in which the vertical member 4 and the horizontal member 5 each constitute an intersection 9 as a single body, and the vertical member and the horizontal member are heat-welded only at the intersection. (B) and (c) show an example in which an intersection 9 is formed by one vertical member 4 and two horizontal members 5 and heat welding is performed at the intersection and the horizontal members. Figure (b)
Is an example in which the thickness of the intersection portion 9 is larger than the thickness of the horizontal portion,
FIG. 3C shows the configuration of the vertical and horizontal members, such as the thickness of the thermoplastic resin layer, and the melting and bonding conditions in the thermal welding, such that the vertical members are sandwiched between the horizontal members, and the intersection portions and the horizontal portions have substantially the same thickness. This is an example of controlling.

The above-mentioned structural examples of the ground stabilizing material of the present invention are a very small part. Means for arranging the long body of the present invention in a lattice shape as a vertical member and a horizontal member, for example, a manual or a ready-made loom or knitting Any desired structure can be obtained by using a machine.
In addition, any well-known method is applied to the method of heat welding in the present invention. For example, the heat welding can be performed by providing a long body arranged as described above to a hot press, a hot plate welding machine, or an ultrasonic welding machine. it can.

In the present invention, the thickness of the vertical portion is basically determined by the thickness of one vertical member and the number to be heat-welded, but is preferably 2.5 mm or less, preferably 0.5 to 2.0 mm. Range. When the thickness is more than 2.5 mm, the rigidity of the net becomes too high, and as a result, the winding property is reduced, which hinders the handling, and also reduces the workability. Also, 0.
If it is smaller than 5 mm, desired characteristics cannot be obtained.

In the present invention, the thickness of the horizontal portion is basically determined by the thickness of one vertical member and the number of pieces to be thermally welded, as in the case of the vertical portion, and is 1.0 to 10.0 mm. , Preferably in the range of 1.5 to 8.0 mm. If it is less than 1.0 mm, the desired pull-out resistance cannot be obtained, and
If it exceeds mm, the pull-out resistance will not be improved in accordance with the amount of material used, and handling will be inconvenient if the thermoplastic resin layer is thickened.

The joint length t ₁ between the longitudinal members is preferably 20
In the range of 100 mm, the transverse member between first multiplexer t ₂ is preferably in the range of 30 to 200 mm, it can be suitably determined according to the purpose. The method of using the ground stabilizing material of the present invention is such that the difference in thickness between the vertical portion and the horizontal portion is used so that the direction of the force expected due to deformation of the ground and the direction of the longitudinal direction of the horizontal member match. Is preferred. In addition, it is preferable to lay the ground stabilizing material surface generated by the thermal welding so that the convex portion is on the lower side of the embankment from the viewpoint of securing the smoothness of the embankment surface after construction.

The soil stabilizing material of the present invention is excellent in tensile properties, creep properties and pull-out resistance, and is suitable for embankment construction methods such as high embankment in a soft ground where a laying area cannot be obtained or embankment with a steeper slope. is there. The constituent materials of the long body used in the present invention will be described. [Thermoplastic Resin] The following or modified resins thereof can be exemplified as the thermoplastic resin used in the long fiber-containing resin and the thermoplastic resin layer used in the present invention.・ Polyolefin resin: polyethylene resin, polypropylene resin, poly-1-butene resin, poly-4-methyl-
At least one of 1-pentene resin, propylene-ethylene copolymer resin and propylene-1-butene copolymer resin; polyester resin: at least one of polyethylene terephthalate, polybutylene terephthalate and polyethylene terephthalate isophthalate; polyamide resin (Nylon): polyamide-6, polyamide-7, polyamide-66, polyamide-610,
Polyamide-11; Polyamide-12; Polyacetal; Polyurethane; A composition comprising two or more of the above and a polymer alloy comprising two or more of the above.

Of these, crystalline polyolefins, particularly crystalline polypropylene, are preferably used from the viewpoints of versatility and mechanical strength. In the case where the thermoplastic resin does not have a reactive functional group or a polar functional group for imparting interfacial adhesion to inorganic reinforcing fibers, particularly glass fibers, to a molecular terminal group like a polyolefin (poly-α-olefin). It is possible to take measures such as modifying the resin with a derivative such as an unsaturated acid or an acid anhydride thereof and / or blending a required amount of the polymer modified with the unsaturated acid into the unmodified resin. Useful.

The unsaturated acid which can be used as the above modifier is usually an aliphatic unsaturated acid, for example, at least one selected from acrylic acid, methacrylic acid, maleic acid, citraconic acid and mesaconic acid, Preferably it is maleic acid. Derivatives such as unsaturated acid anhydrides that can be used as a modifier are usually aliphatic unsaturated acid anhydrides, for example, one or more selected from maleic anhydride and itaconic anhydride, and are preferably anhydrides. Maleic acid (maleic anhydride).

In the present invention, when such a modifier is used, an organic peroxide may be used in combination, if necessary. Examples of organic peroxides include, for example, 2,5-
Dimethyl (t-butylperoxy) hexane, 1,3-bis (t-
(Butyl-oxyisopropyl) benzene, dicumyl peroxide and benzoyl peroxide.

As the thermoplastic resin, the above-mentioned non-modified resin and modified resin may be used alone or in combination as a resin composition. In order to realize a fiber-containing resin having a strong bond with the inorganic reinforcing fiber, it is preferable to use at least a modified resin. Such a modified resin or modified resin composition is, for example, a non-modified resin serving as a base material, a modifier, and an organic peroxide were mixed by a mixing means such as a Henschel mixer (trade name). Thereafter, it is supplied to an extruder to be melt-kneaded, and then the melt-kneaded product is extruded to be manufactured.

The thermoplastic resin may contain one or more of the following various additives as required: an antioxidant, a heat stabilizer, an ultraviolet absorber, a resinous destruction inhibitor, an antistatic agent. Agents, lubricants, plasticizers, mold release agents, flame retardants (flame retardants), flame retardant aids and crystallization promoters (nucleating agents; crystallization agents), dyes and pigments.

These additives may be used in a form previously mixed with the above-mentioned thermoplastic resin serving as a matrix, or may be used in the form of a master batch. Further, it is preferable that the thermoplastic resin of the fiber-containing resin and the thermoplastic resin of the thermoplastic resin layer be the same resin or a compatible resin, since the bonding property between the interfaces can be strengthened. [Inorganic reinforcing fiber] In the present invention, the continuous inorganic reinforcing fiber forming the fiber-containing resin can be obtained by opening a bundle of single fibers, usually a roving form. In addition to roving, glass yarn or tow can be used.

From the viewpoint of the material, the inorganic reinforcing fiber includes, for example, glass fiber, rock wool (rock wool), asbestos, quartz fiber, metal fiber, whisker (whisker), and carbon fiber. Among them, glass fibers are usually preferably used in view of their properties and availability. As the glass fiber, hard glass is preferable, and in particular, E glass which is non-alkali glass is preferably used. This glass fiber is a commercially available glass roving that is usually manufactured for resin reinforcement, and usually has an average fiber diameter of 4 to 30 μm, a number of filament bundles of 400 to 10,000, and a Tex count of 300 to
20,000, preferably an average fiber diameter of 9 to 2
It is 3 μm. If necessary, these glass rovings can be combined and used.

The inorganic reinforcing fibers include, for example, silane coupling agents, titanate coupling agents,
A surface treatment with a surface treatment agent such as at least one of a boron-based coupling agent and an aluminate-based coupling agent may be used. When the surface treatment is applied to the inorganic reinforcing fibers, the affinity for a hydrophobic resin such as polypropylene is increased, and the resin such as polypropylene is easily impregnated between the spread fibers.

The inorganic reinforcing fibers described above may be used alone or in combination of two or more. [Fiber-containing resin] As a method for producing a fiber-containing resin, the above-described heat of the molten state is introduced into continuous inorganic reinforcing fibers arranged substantially parallel to the length direction of the long body (flow direction of the resin). A procedure for impregnating a plastic resin can be given. When impregnating the inorganic reinforcing fiber with the resin, the inorganic reinforcing fiber is spread as evenly as possible on a flat surface, and the resin is uniformly impregnated into the spread fiber, and the obtained long body machine is obtained. This is preferable in that the target strength can be improved.

The method for impregnating the inorganic reinforcing fiber with the resin may be any method as long as the method can impregnate the resin with the inorganic reinforcing fiber. For example, Japanese Patent Publication No. 63-37694, Japanese Patent Publication No. 4-418 describes this impregnation method.
86 and JP-A-61-229534. This kind of fiber-containing resin is formed, for example, by uniformly opening inorganic reinforcing fibers such as roving on a plane, and then uniformly impregnating the inorganic reinforcing fibers with the resin melt-kneaded in an extruder. Can be done.

The thickness of the fiber-containing resin used for the vertical member is
Although not particularly limited, it is preferably 0.1 to 2.0 mm. If the wall thickness is less than 0.1 mm, it is difficult to manufacture and the production efficiency is reduced. If the thickness is more than 2.0 mm, the rigidity of the vertical members is too high, which may hinder handling. The thickness of the fiber-containing resin used for the cross member is not particularly limited, but is preferably 0.6 to 9.6 mm. If the thickness is less than 0.6 mm, the desired pull-out resistance cannot be obtained due to a decrease in thickness and rigidity. When the thickness is more than 9.6 mm, the effect of improving the pull-out resistance with respect to the increase in thickness is not only small, but also the production speed of the fiber-containing resin is extremely reduced, which leads to an increase in the cost of the present invention.

The inorganic reinforcing fiber is contained in the fiber-containing resin in an amount of preferably 10 to 80% by weight, more preferably 30 to 70% by weight. By using the inorganic reinforcing fiber in this amount, the inorganic reinforcing fiber can be sufficiently impregnated with the thermoplastic resin, and the inorganic reinforcing fiber is integrally bonded to each other by the thermoplastic resin. When the content of the inorganic reinforcing fiber is 5% by weight or less, a reinforcing effect such as tensile strength may not be sufficiently exhibited. On the other hand, when the content of the inorganic reinforcing fibers reaches 90% by weight or more, a sufficient reinforcing effect may not be exhibited. It is understood that the cause is that the thermoplastic resin does not sufficiently impregnate the inorganic reinforcing fibers. [Thermoplastic resin layer] The thermoplastic resin layer is a layer formed of a thermoplastic resin having the above specific properties on the entire surface of the fiber-containing resin. The thickness of the thermoplastic resin layer is not particularly limited, but is preferably 0.2 mm or more.
A range of 2 to 1.0 mm is preferred. When the thickness of the thermoplastic resin layer is less than 0.2 mm, the pull-out resistance decreases due to the decrease in the strength of the intersections. It does not improve with the quantity and is inconvenient to handle.

For preparing the thermoplastic resin layer, for example, a method in which the resin is formed into a film in advance and then the film is laminated on the surface of the fiber-containing resin, or the thermoplastic resin in a molten state is coated on the surface of the fiber-containing resin It can be produced by a method or the like. When the thermoplastic resin layer is formed by laminating, for example, first, a thermoplastic resin and, if necessary, a modifier and the like are mixed, supplied to an extruder, melt-kneaded, and formed into a film. Form a film. Separately, for example, a fiber-containing resin is formed by impregnating a molten thermoplastic resin into inorganic reinforcing fibers. Then, while keeping the fiber-containing resin in a semi-molten state, the fiber-containing resin is laminated with a film that has been wound in advance. When the fiber-containing resin and the film are bonded together, the fiber-containing resin does not necessarily need to be in a semi-molten state, and may be bonded to the film using an adhesive after the fiber-containing resin is cooled and solidified.

In the case where the thermoplastic resin layer is formed by coating, the surface of the fiber-containing resin may be extruded and coated with the thermoplastic resin while the fiber-containing resin is kept in a semi-molten state. After cooling and solidifying the fiber-containing resin, the surface of the fiber-containing resin may be coated.

[0035]

EXAMPLES Next, the present invention will be described with reference to examples, but the present invention is not limited to these examples. Also,
The definitions of the terms used in the examples and comparative examples and the measuring method are as follows. Glass fiber content: Measured according to JIS K7052.

MFR (Melt Flow Rate): JIS
It measured according to K7210 (load 21.18N, heating temperature 230 degreeC). Pull-out resistance: Toyoura standard sand is spread above and below a 50 × 50 cm sample so that the vertical pressure is 0.02 MPa.
The load when the sample was withdrawn at a drawing speed of 1 mm / min was defined as the pulling resistance. Example 1 Modified PP ｛Crystal Melting Point (Tm: Differential Scanning Calorimetry (DS
C) 160 ° C .: MFR 130 g / 10 min: A glass roving having 4,000 individual filaments bundled was passed through a bath at a temperature of 270 ° C. in which the modified maleic anhydride was melted.
A fiber-containing resin impregnated with a molten resin was drawn out from a 5 mm × 0.6 mm die provided at the outlet of the bathtub, cooled and solidified through a nipple to obtain a linear product a. The glass content of the linear material a was 60% by weight. Further, the linear material a was guided to a coating die, and PP (MFR 2.0 g / 10 min, DSC melting point 160 ° C.)
PP), the entire surface of the linear material a is coated with a thermoplastic resin layer so as to be substantially uniform, and then cooled and solidified to obtain a linear material A covered with the entire PP having a width of 7 mm and a thickness of 1.0 mm. .

The modified PP ｛crystal melting point (Tm: DS)
C) 160 ° C: MFR 130g / 10min: Modified maleic anhydride｝
A fiber-containing resin impregnated with a molten resin from a 5.0 mm × 1.8 mm die provided at the outlet of the bath through three glass rovings in which 4,000 individual filaments are bundled in a bath at a temperature of 270 ° C. The solid was cooled and solidified by passing through water to obtain a linear material b. Glass content of linear material b is 60wt
%Met. Further, the linear object b is led to a coating die and PP
(MFR 2.0 g / 10 min, DSC with a melting point of 160 ° C. PP) is coated on the entire surface of the linear material b so as to be substantially uniform, cooled and solidified, and coated with the entire surface PP having a width of 7.0 mm and a thickness of 3.0 mm. A linear product B was obtained. The obtained linear material A is used as a vertical member and a horizontal member,
Using the obtained linear object B as a horizontal member, the upper surface of the vertical member is interposed between the linear member B and the lower surface of the vertical member with the linear member A to form an intersection portion, and the cross-member interval is 100 mm, and the vertical member is used. 50mm between eyes
And then led it to a hot press heated to 180 ° C., heated for 5 minutes with tension applied to each linear object, cooled and solidified, and the intersections and cross members were heat-welded. The intended sample of Example 1 was obtained. Example 2 Modified PP: Crystal melting point (Tm: DSC) 160 ° C .: MFR 130 g / 1
0 min: Two glass rovings each having 4,000 individual filaments bundled in a bath at a temperature of 270 ° C. in which the modified maleic anhydride was melted, and 5.0 mm provided at the outlet of the bathtub
As a fiber-containing resin impregnated with a molten resin from a × 1.2 mm die, it was cooled and solidified through a draw-out nip roll to obtain a linear material c. The glass content of the linear material c was 60% by weight. Further, the linear object c is guided to a coating die, and PP (MFR
2.0 g / 10 min, DSC with a melting point of 160 ° C. PP)
Was coated with a thermoplastic resin layer so as to be substantially uniform, and then cooled and solidified to obtain a linear material C coated with the entire surface PP having a width of 7.0 mm and a thickness of 2.0 mm.

A sample of Example 2 was obtained in the same manner as in Example 1 except that the obtained linear object C was used as a horizontal member and two linear objects A were used as a vertical member. Was. Example 3 In Example 1, the obtained linear object A was used as a vertical member, and 1
A sample of Example 3 was obtained in the same manner as in Example 1, except that two bodies were used as the body and the cross member, respectively. Example 4 Modified PP @ crystal melting point (Tm: DSC) 160 ° C .: MFR 130 g / 1
0min: 5.0 mm provided at the outlet of the bathtub by passing four glass rovings in which 4,000 individual filaments were bundled through a bath at a temperature of 270 ° C. in which the modified maleic anhydride was melted.
As a fiber-containing resin impregnated with a molten resin from a × 2.4 mm die, it was cooled and solidified through a draw-out nip roll to obtain a linear material d. The glass content of the linear material d was 60% by weight. Further, the linear object d is guided to a coating die, and PP (MFR
2.0 g / 10 min, DSC melting point 160 ° C PP)
Was coated with a thermoplastic resin layer so as to be substantially uniform, and then cooled and solidified to obtain a linear material D coated with the entire surface PP having a width of 7.0 mm and a thickness of 4.0 mm.

The obtained linear object D was used as one horizontal member,
A sample of Example 4 was obtained in the same manner as in Example 1, except that the linear material A was used as a vertical member to form a lattice-like body using one body. Example 5 A sample of Example 5 was obtained in the same manner as in Example 4 except that the linear material used as the cross member in Example 4 was linear material C. Comparative Example 1 Modified PP @ crystal melting point (Tm: DSC) 160 ° C .: MFR 130 g / 1
0 min: a glass roving having 4,000 individual filaments bundled in a bath at a temperature of 270 ° C. in which the modified maleic anhydride was melted, and 5.0 mm provided at the outlet of the bathtub
As a fiber-containing resin impregnated with a molten resin from a 0.36 mm die, it was cooled and solidified through a draw-out nip roll to obtain a linear material e. The glass content of the linear material e was 60% by weight. Further, the linear material e is guided to a coating die, and PP (MFR
2.0 g / 10 min, DSC melting point 160 ° C PP)
Was coated with a thermoplastic resin layer so as to be substantially uniform, and then cooled and solidified to obtain a linear material E coated with the entire surface PP having a width of 8.7 mm and a thickness of 0.4 mm.

The obtained linear object E was used as two cross members,
A sample of Comparative Example 1 was obtained in the same manner as in Example 1 except that one linear material A was used as a vertical member. A pull-out resistance test was performed on each of the obtained samples, and the measurement results are shown in Table 1.

[0041]

[Table 1]

From Table 1, it can be seen that the examples of the present invention in which the vertical and horizontal portions have a predetermined thickness have much better pull-out resistance than the comparative example in which the horizontal portions are smaller than the present invention. Note that the present invention is not limited to the above embodiments,
It is intended to cover all modifications that can be easily inferred by those skilled in the art from the above description.

[0043]

EFFECT OF THE INVENTION The ground stabilizing material of the present invention is excellent in tensile strength and pull-out resistance (restriction of embankment), and can not only reduce the weight and cost but also reduce the construction area and lay Construction is possible in places where the length is difficult.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example in which a continuous inorganic fiber reinforced thermoplastic resin long body used for a vertical member and a horizontal member of the present invention has a rectangular cross section in the width direction.

FIG. 2 is a view showing an example of a lattice-shaped body of the present invention formed on a plane, heat-welding the same, and viewed from a direction perpendicular to the plane.

FIGS. 3A and 3B are cross-sectional views taken along a line AA in FIG. 2, wherein FIGS. 1 the elongate body 2 inorganic reinforcing fibers 3 Thermoplastic resin 4 fiber-containing resin 5 Thermoplastic resin layer 6 Soil stabilizer 7 longitudinal members 8 crosspiece 9 intersections 10 vertical section 11 transverse section t ₁ the longitudinal member between eyes if t ₂ Cross material

Claims (6)

[Claims] 1. A continuous inorganic fiber reinforced thermoplastic resin elongated body obtained by coating a thermoplastic resin layer on a fiber-containing resin obtained by impregnating a continuous inorganic reinforcing fiber with a thermoplastic resin, is used as a longitudinal member and a transverse member. After forming a grid by arranging them in a grid,
A ground stabilizing material having a vertical portion, a horizontal portion, and an intersection portion formed by heat-welding the lattice-like body, wherein the vertical portion has a thickness of 2.5 mm.
The ground stabilizing material, wherein the thickness of the lateral portion is 1.0 to 10.0 mm. 2. The crossing point portion has a structure in which both surfaces of the vertical member are sandwiched by the horizontal member and are welded to each other, and the horizontal portion has a structure in which the horizontal member is heat-welded to each other. The ground stabilizing material according to 1. 3. The ground stabilizing material according to claim 1, wherein said thermoplastic resin layer is coated with a thermoplastic resin having a thickness of 0.2 mm or more. 4. The fiber-containing resin according to claim 1, wherein the content of the fiber for inorganic reinforcement is 10 to 80% by weight.
The ground stabilizing material according to any one of Items 3 to 3. 5. The ground stabilizing material according to claim 1, wherein the inorganic reinforcing fiber is made of glass fiber. 6. The ground stabilizing material according to claim 1, wherein the resin used for the fiber-containing resin and the thermoplastic resin layer is a polyolefin resin or a modified resin thereof. .