JPH0355318A - Composite reinforcing part for ground - Google Patents

Abstract

PURPOSE:To prevent the fluidization of the ground to be reinforced by a method in which main axially directed fiber bundles bound with resin are crossed with fiber bundles directed to the other direction into a latticed form and then press- molded, and a high corrosion-resistant nonwoven fabric is bonded to the surface of the reinforcing part. CONSTITUTION:Main axially directed fiber bundles 2A are crossed with fiber bundles 2B extended to the other direction into a latticed form. The fiber bundles positioned on the outermost layer at the crossings are extended to other direction and the expanded crossings are crushed by press molding. The interval between the adjacent crossing in the main axial direction is made larger than that of the crossings in the other directions, and a high corrosion- resistant nonwoven fabric 5 is bonded to the surface of the latticed reinforcing part. The fluidization of the ground to be reinforced can thus be prevented, and the occurrence of land slide can also be prevented by raising the shearing strength of the soil.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial T+L Field" The present invention relates to a composite reinforcing material for ground ridge reinforcement suitable for use in reinforcing natural ground, particularly reinforcing embankments.

"Prior Art" Conventionally, when constructing an embankment, various reinforcing measures have been applied to prevent landslides and skidding.

An example of such reinforcing means is a method of burying nonwoven fabric in layers in the embankment to be constructed.

This reinforcing means is carried out by laying a plurality of strip-shaped nonwoven fabrics on the surface of the earth and sand each time the earth and sand constituting the embankment are appropriately heaped up. in this case,
Each time soil is piled up, a belt-shaped nonwoven fabric is laid on the surface, and adjacent nonwoven fabrics are sewn together to cover the soil.

Then, more earth and sand is piled up on top of the sewn non-woven fabric, the non-woven fabric is laid on the surface of this earth and sand, and the embankment is constructed by repeating this process, and the whole is buried in layers in the embankment. .

On the other hand, in addition to nonwoven fabrics, high-strength continuous fibers are being introduced as an effective reinforcing means for embankments. This high-strength continuous fiber has fiber bundles made of a plurality of aligned fibers crossing each other to form a lattice shape, each fiber of the fiber bundles being bound together with a resin material, and The intersection with the bundle has a cross-sectional shape in which three or more layers of #a fiber groups extending in one direction and fiber groups extending in the other direction are laminated.

The purpose of this reinforcing means using reinforcing materials is to bury, for example, a grid-shaped reinforcing material in layers in the embankment, and to stabilize the embankment by utilizing the pull-out resistance of the reinforcing material.

``Problems to be Solved by the Invention'' However, if only nonwoven fabric is used as a means of reinforcing embankments, ground, etc., a process of sewing together the nonwoven fabric is required, which causes a delay in work.

In addition, if a method of reinforcing the ground is performed using only a lattice-shaped reinforcing member made of high-strength continuous fibers, there is a risk that the earth and sand will move through the mesh of the lattice-like reinforcing member, leading to fluidization of the earth and sand. Furthermore, due to the structure of this reinforcing material, it is relatively thick at about 2 cm, so when it is buried in the soil as a reinforcing material for an embankment, it does not blend well with the soil and has poor workability. This reinforcement is hard and rigid;
Because it is difficult to bend, when the embankment is compacted, the transmitted force is not evenly transmitted to the bottom of the reinforcing material, which prevents the lower layer of the embankment from being sufficiently compacted and the upper layer of the embankment from being leveled out. In addition, there was a risk that the pressure would be concentrated in one place and cause damage.

Therefore, an object of the present invention is to provide a composite reinforcing material for ground reinforcement that has good embankment workability, high strength, and can eliminate fluidization of earth and sand in the ground to be reinforced.

"Means for Solving the Problems" The composite reinforcing material for ground reinforcement of the present invention is used for reinforcing the ground, and is composed of one or more fiber bundles in the main axis direction consisting of a plurality of aligned fibers. and two or more layers of fiber bundles extending in the other direction intersect with each other to form a lozenge shape, and these fiber bundles are tied together with resin binder,
At the intersection of the fiber bundles, each fiber bundle located in the outermost layer extends in the other direction, and the bulge at the intersection is crushed by press molding, and the distance between adjacent intersections in the main axis direction is reduced. A nonwoven fabric having high corrosion resistance is provided on the surface of the lattice-shaped reinforcing member, which is larger than the interval between adjacent intersections in the other direction.

"Function" In the composite reinforcing material for ground reinforcement of the present invention, the movement of earth and sand in the ground to be reinforced is regulated by the nonwoven fabric provided in the lattice-shaped reinforcing member. In addition, the lattice-shaped reinforcing member has a lattice-like structure in which one or more layers of fiber bundles in the main axis direction, which are made up of a plurality of aligned fibers, and two or more layers of fiber bundles extending in the other direction intersect with each other. None, the fiber bundles are bound by a resin material, and at the intersection of the fiber bundles, the fiber bundles located in the outermost layer extend in the other direction, and the bulge at the intersection is press-molded. By being crushed, the strength of the intersection is extremely high, and the thickness is thin, so when buried in embankment, it becomes integrated with the soil and provides sufficient pull-out resistance. There is. In addition, in this composite reinforcing material for groundwater reinforcement, the spacing between adjacent intersections in the main axis direction is larger than the spacing between adjacent intersections in the other direction, so that the fibers in the main axis direction are The bundles are easy to bend and do not easily bend and break when buried in embankment and compacted, and also blend well with the soil, so when the embankment is compacted, the rolling force is evenly transmitted to the bottom of the reinforcing material. This allows the lower layer of the embankment to be sufficiently compacted and the upper layer of the embankment to be leveled.

``Example'' Hereinafter, an example of the present invention will be described with reference to FIGS.

The composite reinforcing material 1 for ground reinforcement of this embodiment is a reinforcing material that is buried in layers in an embankment to stabilize the embankment, and as shown in FIG. Fiber #
The fiber bundle 2A in the main axis direction consisting of L12 and the fiber bundles 2B, 2B of the same structure cross each other to form a lattice shape, and the fiber bundles 2A and 2B are bound together by a resin material 3. A nonwoven fabric 5 made of synthetic fibers such as vinylon is provided on the surface of the lattice-shaped reinforcing member 4.

The intersection 6 between the fiber bundle 2A and the wA fiber bundles 2B, 2B is
As shown in FIGS. 2 and 3, a cross section of a three-layer structure in which a fiber bundle 2A extending in the main axis direction and fiber bundles 2B, 2B extending in the other direction perpendicular to the main axis direction are laminated. shape, and the outermost layer at the intersection 6 is the fiber bundles 2B, 2B in the other direction, and the intersection FKS6
The bulge is crushed by press molding, and the distance between adjacent intersections 6, 6 in the main axis direction is larger than the distance between adjacent intersections 6, 6 in the other direction.

The fiber bundles 2 that form the main body of this lattice-like reinforcing member 4 are as follows:
Glass fibers, carbon fibers, aramid fibers, etc., which are lightweight and have high strength, are mainly used, and other fibers, such as resin fibers, ceramic fibers, metal fibers, etc., are used in appropriate combinations as necessary. .

Further, as the resin material 3, for example, vinyl ester resin, etc., which has good adhesiveness to the fiber bundle 2 and has sufficient strength properties itself, is mainly used. Correspondingly, unsaturated polyester resins, epoxy resins, phenolic resins, etc. are used.

The ratio of the fiber bundles 2 and the resin material 3 is appropriately determined taking into account the type and strength of the fibers 2, the usage pattern of the reinforcing member 4, etc. If 3 is a vinyl ester resin, the fiber 2 should be added so that the volume ratio of the fiber 2 is about 30 to 70%.
For example, in the case of pitch-based carbon fibers, it is desirable to consider that the ratio is about 20 to 60%. If the ratio of IiI & fiber 2 is less than the above, the strength of this reinforcing member 4 will decrease significantly.On the other hand, if the ratio of fiber 2 is increased, a reinforcing member 4 with a correspondingly higher strength can be obtained, but if the ratio is too high, This makes molding difficult, which is not preferable.

The reinforcing member 4 having such a structure can be manufactured using, for example, the apparatus shown in FIG. 4. In the figure, reference numeral 15 denotes a surface plate, 16 a guide frame provided around the surface plate 15, and 17 arranged side by side on the outer surface of the surface plate, corresponding to the horizontal and vertical components of the reinforcing member 4, respectively. It's a pin. As for the manufacturing method, continuous fibers impregnated with resin are sequentially hooked into the corresponding bottles 17 in the vertical and horizontal directions in a so-called one-stroke manner, and at the intersection 6, the fiber bundle 2A is always
, 2B are overlapped alternately. FIG. 5 shows an example of a method of laminating the intersections, in which fiber bundles 2A and 2 are constructed by impregnating a resin material with a large number of fibers 2 bundled together.
By passing the fibers B and 2B in the order of numbers ■ to ■ with arrows in the figure, one layer of fiber bundles 2A in the main axis direction is formed.
are sandwiched between two layers of fiber bundles 2B, 2B orthogonal thereto, and stacked so that each intersection 6 has a cross-sectional shape as shown in FIGS. 6 and 7.

After doing this, the resin material 3 of each layer is pressed to reduce its thickness before it hardens.
In particular, the cross-sections 6 are crushed to form a cross-sectional shape of a three-layer structure as shown in FIGS. 2 and 3, and the entire structure is formed into a rectangular lattice shape with almost no steps and approximately the same thickness.

Then, on the surface of the lattice-shaped reinforcing member 4, a nonwoven fabric 5 made of synthetic fibers such as vinylon and nylon is pasted to form a composite reinforcing material 1 for ground reinforcement.

When providing the nonwoven fabric 5 on the lattice-shaped reinforcing member 4, the non-woven fabric 5 may be attached with an adhesive after the press working is completed, or the adhesive force of the resin material 3 may be applied before the lattice-shaped reinforcing member 4 is completely cured. It may also be pasted using. Alternatively, the fiber bundle may be provided so as to be sandwiched between fiber bundles stacked in multiple layers so as to be integrated as a whole.

Next, an example of the use of this composite reinforcing material l for ground reinforcement will be explained.

First, earth and sand are piled up on the ground that will form the embankment. At this time, the composite reinforcing material 1 for ground reinforcement of this embodiment is laid so as to cover the top of this embankment.

After the composite reinforcing material 1 for ground reinforcement is laid, earth and sand is further piled up on top of the composite reinforcing material 1 for ground reinforcement.

At this time, as in the previous step, the composite reinforcement material 1 for ground reinforcement is laid so as to cover the second embankment.

The direction of the Hikikinura reinforcing material 1 for ground reinforcement to be laid in this step is perpendicular to the direction in which it was laid in the previous step.

Repeat this process, and finally pile up the earth and sand.
The work will be completed by constructing the embankment as shown in Figure 5. The intervals at which the composite reinforcing material for ground reinforcement is laid are arbitrarily determined each time, and may be formed in several layers. Moreover, it is preferable to similarly lay the composite reinforcement material 1 for ground reinforcement on the surface of the embankment that has been constructed.

In the embankment constructed through such a process, a composite reinforcing material for ground reinforcement is always placed between the earth and sand, making it stable in terms of strength.

In other words, the composite reinforcement material for ground reinforcement placed inside this embankment is formed into a lattice shape using high-strength continuous fibers, so the force when the embankment slides is reduced by the shear displacement resistance of the reinforcement material. The interlock effect (the effect of increasing the shear strength when the earth and sand and the composite reinforcement material for ground reinforcement try to move together) increases the shear strength of the earth and sand during construction and embankment. It is possible to prevent landslides after construction.

Moreover, since the surface of this composite reinforcing material 1 for strengthening the ground is covered with a nonwoven fabric 5 made of vinylon, nylon, etc., fluidization of the ground to be reinforced can be effectively prevented.

In addition, if the lattice-shaped reinforcing member and the non-woven fabric are integrated in advance before reinforcing the ground, etc., there is no need to attach the lattice-shaped reinforcing part and the non-woven fabric on site, thereby shortening the work process. can.

Furthermore, since the conventional work of sewing adjacent nonwoven fabrics one by one can be omitted, it is possible to shorten the work process, thereby shortening the construction period and reducing the construction cost.

Note that the details of the composite reinforcing material for ground reinforcement of the present invention are not limited to the above embodiments, and various modifications are possible.

As shown in FIG. 1, the lattice-like reinforcing member 4 of this embodiment is formed by press molding into a rectangular lozenge shape with almost no steps and approximately the same thickness as a whole, but as shown in FIG. As shown, press molding is performed so that the thickness of the intersection part 6 is equal to the thickness of the member in the other direction consisting of the fiber bundles 2B, 2B, and the thickness of the member in the main axis direction consisting of the fiber bundle 2A is thinner than this. There is no harm in making it happen. In this case, for example, when constructing an embankment and forming a wall by involving the embankment material, it is possible to increase the pull-out resistance acting toward the outside of the embankment.

In addition, in the lattice-shaped reinforcing member 4 of this embodiment, the fiber bundles 2A in the main axis direction are made in one layer, and the fiber bundles 2B in the other direction are made in two layers.
Although the cross section 6 has a three-layer structure, in the composite reinforcing material l for ground reinforcement of the present invention, the cross section 6 has a three-layer structure, as shown in FIG.
The cross section 6 may have a seven-layer structure as shown in FIG. 10, and in any case, the outermost layer of the cross section 6 or the fiber bundle 2B in the other direction may be used.

Moreover, instead of providing the nonwoven fabric 5 only on one side of the lattice-shaped reinforcing member 4, as shown in FIG.
Even if the nonwoven fabrics 5, 5 are provided on both sides of the structure, the same effects as in the above embodiment can be obtained.

"Effects of the Invention" The composite reinforcing material for ground reinforcement of the present invention is used for reinforcing the ground, etc., and consists of one or more fiber bundles in the main axis direction consisting of a plurality of aligned fibers and one or more fiber bundles in the other direction. Two or more layers of fiber bundles extending across each other cross each other to form a lattice shape, and these fiber bundles are bound together by a resin material,
At the intersection of each fiber bundle, each m-vertebral bundle located in the outermost layer extends in the other direction, and the bulge at the intersection is crushed by press molding, and further between the adjacent intersections in the main axis direction. The non-woven fabric with high corrosion resistance is provided on the surface of the lattice-shaped reinforcing member in which the spacing between the two adjacent intersections in the other direction is larger than the spacing between adjacent intersections in the other direction. Fluidization can be effectively prevented.

This composite reinforcement material for ground reinforcement is formed in a lattice shape using high-strength continuous fibers, so the force when the ground to be reinforced slips can be eliminated by the shear displacement resistance of the reinforcement material. In addition, the interlock effect (the effect of increasing the shear strength as the earth and sand try to move together as a unit) can increase the shear strength of the earth and sand, thereby preventing landslides during construction and after embankment construction. .

Furthermore, if the lattice-shaped reinforcing member and the non-woven fabric are integrated in advance before reinforcing the ground, etc., it is not necessary to attach the lattice-shaped reinforcing member and the non-woven fabric on-site, thereby shortening the work process. . Furthermore, since the work of sewing adjacent nonwoven fabrics one by one can be omitted, it is possible to shorten the work process, thereby shortening the construction period and reducing the construction cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIGS. 2 and 3 are side sectional views of intersections of lattice-shaped reinforcing members, and FIGS. 4 and 5 are steps for creating the lattice-shaped reinforcing members. FIGS. 6 and 7 are cross-sectional views showing the laminated structure of the intersections of the lattice-like reinforcing members, and FIGS. 8 to 11 are views showing other embodiments of the present invention. Fig. 8 is a perspective view of an example in which the thickness of the member in the other direction is thickened, Fig. 9 is a sectional view of an example in which the intersection part is made up of five layers, and Fig. 10 is an example in which the intersection part is made into seven layers. FIG. 11 is a perspective view of an example in which a nonwoven fabric is provided on both sides of a lattice-like reinforcing member. l... Composite reinforcement material for ground reinforcement, 2...
...Fiber bundle, 3 resin material, 4 lattice reinforcement member, 5 nonwoven fabric.

Claims (1)

[Claims] Composite reinforcing material for ground reinforcement used for ground reinforcement, etc., consisting of one or more fiber bundles in the main axis direction consisting of a plurality of aligned fibers, and two or more layers of fiber bundles extending in the other direction. The fiber bundles intersect with each other to form a lattice shape, and the fiber bundles are bound by a resin material, and at the intersection of the fiber bundles, each fiber bundle located in the outermost layer extends in the other direction. The bulges at the intersections are crushed by press forming, and the distance between adjacent intersections in the main axis direction is larger than the distance between adjacent intersections in the other direction. A composite reinforcing material for ground reinforcement characterized by being provided with a nonwoven fabric having high corrosion resistance.