JP2002302952A - Sheet for reinforcement banking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet for reinforcement banking which has a very high tensile strength, which favorably integrates banking above and under the sheet when constructed, which has excellent drainage performance to water invading into the banking, and which well stabilizes the banking. SOLUTION: Plural uniaxially drawn strands of synthetic resin are coupled with each other to form a long and flat belt body 4, the belt bodies 4 are vertically and laterally combined with each other, and their crossing parts are bonded to each other to compose this sheet for reinforcement banking. The strand of synthetic resin is favorably composed of a uniaxially drawn film or monofilament. The belt body 4 comprises the strands of synthetic resin disposed in parallel in a vertical direction, and woven with wefts, or sewn in a lateral direction, the strands of synthetic resin disposed in the vertical direction with ribbon-like wefts crossing them, and bonded at their crossing points, or those with coating formed on the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a sheet for reinforcing embankment having a high mechanical strength and enabling high embankment, and a reinforcing embankment method.

[0002]

2. Description of the Related Art Heretofore, slopes have been often constructed by embankment, slope construction, embankment and the like. In the construction of embankments and slopes, civil engineering sheets called geotextiles and geogrids are used to promote uniform consolidation of the embankment or to prevent embankment or slope collapse due to slippage of the embankment. I have.

[0003] Such embankment work involves laying a civil engineering sheet at a position to be embanked, laying the earth to a predetermined thickness thereon, and further laying a civil engineering sheet to repeat the embankment and repeat the steps of embankment. The embankment is also performed repeatedly, and this embankment method is called a reinforcement embankment method.

[0004] In recent years, the embankment in the soft mud zone has increased, or the embankment construction has been increased in scale and the height of the embankment has been increased, so that the load applied to the lower bottom of the embankment has become extremely large. And as such civil engineering sheet,
Extremely high tensile strength is required.

[0005] In order to stabilize the embankment, the civil engineering sheet is formed of a mesh-like sheet having a large gap between reinforcing strips for the purpose of connecting and integrating the embankments above and below the sheet. Is often used.

Civil engineering sheet 11 used in such a construction method
As shown in FIG. 7 (A), a high-strength fiber 12, 12 is used as a core material to obtain a tensile strength in the longitudinal direction, and this is covered with a synthetic resin 13 to form a grid-like sheet. Is used. However, when such a sheet is constructed, it is necessary to connect and integrate the embankments above and below the sheet, so that the sheet needs to be a large-sized sheet.
The usable amount of the fibers 12 serving as the core material per horizontal width is limited, and a sheet having a large tensile strength in the vertical direction cannot be obtained.

As the civil engineering sheet 11, FIG.
As shown in (B), a number of filaments 14, 14 for vertical members are used.
By knitting or fusing with the linear members 15 for horizontal members while knitting, a mesh-like sheet with large eyes is formed and used. However, also in such a sheet 11, since it is necessary to connect the embankment on the upper and lower sides of the sheet by making the sheet a large mesh, the usage amount of the vertical filament material is restricted for a constant width in the horizontal direction. There is a problem that it is impossible to increase the tensile strength in the vertical direction with respect to a constant width in the horizontal direction, and therefore, there is a problem that the work for increasing the embankment is not suitable for a heavy embankment lower part.

Further, these civil engineering sheets 11 do not have a drainage function and cannot drain the water in the embankment, so that the embankment is soft, and there is a problem of the settlement of the embankment or collapse of the slope due to slip of the embankment. Construction of drainage material was necessary.

[0009]

SUMMARY OF THE INVENTION A first object of the present invention is to provide a reinforcing embankment sheet which has an extremely high tensile strength in the vertical direction and can be used at the bottom of a high embankment. The second purpose is a sheet for reinforced embankment that has extremely high tensile strength, is well integrated with the upper and lower embankments of the sheet when constructed, has excellent drainage of water infiltrated into the embankment, and has good stability of the embankment Is provided.

[0010]

Means for Solving the Problems The present invention has been made as a result of intensive studies in order to achieve the above object. Specifically, a plurality of strands formed by uniaxially stretching a synthetic resin are joined together. The present invention provides a reinforcing embankment sheet characterized by forming a long and flat belt body, and combining the belt bodies vertically and horizontally to bind an intersection.

Further, the present invention provides the above-mentioned reinforcing embankment sheet comprising a film-like body in which a strand made of a synthetic resin is uniaxially stretched, and the above-mentioned reinforcing embankment sheet in which a strand made of a synthetic resin is made of a monofilament, and a belt body comprising: The reinforcing embankment sheet, which is formed by weaving synthetic resin strands arranged in the direction using weft or sewing in the horizontal direction, made of synthetic resin in which the belt body is arranged in the vertical direction The above-mentioned reinforcing embankment sheet, in which ribbon-like weft yarns are arranged so as to intersect the strands and the intersections are adhered to each other, and the above-mentioned reinforcing embankment sheet, in which the belt body has a film formed on the surface thereof, To provide.

Further, according to the present invention, there is provided the reinforcing member as described above, wherein the vertical belts are arranged in parallel at intervals, and the horizontal belts are arranged in parallel in the direction perpendicular to the belts at intervals, and their intersections are joined. The embankment sheet and the vertical belt are arranged side by side at an interval, and the horizontal belt is arranged at an interval in a direction perpendicular to the belt on the embankment. It is an object of the present invention to provide the above-mentioned reinforcing embankment sheet in which a vertical belt body is arranged in parallel at a position and an intersection thereof is connected, and the above-mentioned reinforcing embankment sheet in which the interval between the belt bodies is larger than the width of the belt body. .

Furthermore, the above-mentioned reinforcing embankment sheet formed by connecting the intersections of the vertical belt body and the horizontal belt body by sewing, and the intersection of the vertical belt body and the horizontal belt body are connected by heat fusion. The above-mentioned reinforcing embankment sheet, the above-mentioned reinforcing embankment sheet in which a film is formed on the surface of the vertical belt body joined at the intersection with the horizontal belt body of the reinforcing embankment sheet, and the reinforcing embankment sheet An object of the present invention is to provide the above-mentioned sheet for reinforcing embankment to which a nonwoven fabric is added.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The reinforcing embankment sheet 1 of the present invention
As shown in FIG. 4, a plurality of strands 3 made of uniaxially stretched synthetic resin are combined to form a long and flat belt body 4, which is shown in FIG. In this way, the intersections are connected in a vertical and horizontal manner.

As the strand 3, a synthetic resin having an excellent stretching effect is used.
Polypropylene, polyester, polyamide, and polyaramid can be used. In particular, it is desirable to use a thermally crosslinkable synthetic resin such as high-density polyethylene in order to enhance the creep resistance.

In the present invention, the strand 3 constituting the belt body 4 broadly means a long object that can constitute the belt body 4, and is a linear body such as a film-like body, a string-like body, a band-like body, and a monofilament. Which may be twisted or non-twisted.

The strand 3 may have any structure. For example, the synthetic resin film may be slit into a predetermined width and uniaxially stretched to form a tape, which can be used after being bundled. The tape may also be a split yarn with multiple cuts. One uniaxially stretched synthetic resin film can be used alone, or several can be bundled and used.

The strand 3 may be a bundle of uniaxially stretched synthetic resin filaments. The cross-sectional shape of the striated body is arbitrary, and may be a round shape, an ellipsoidal shape, a square shape, a polygonal shape, or other irregular shapes. Further, the binding strength can be increased by extruding a mixture of different kinds of resins into filaments and using fibril-formed Dunlines by dividing the resins.

The thickness of the strand 3 is 500-2000.
About 0 dtex is desirable. The strand 3 forming the belt body 4b used in the horizontal direction can be thinner than the strand 3 forming the belt body 4a used in the vertical direction.

In the present invention, the vertical and horizontal directions of the reinforcing embankment sheet 1 are defined such that the direction intersecting with the slope when the sheet is laid is the vertical direction, and the direction parallel to the slope is the horizontal direction. Therefore, the length and width in the present invention are not based on the shape of the sheet.

As shown in FIG. 4, the strands 3 are connected in parallel in one direction to form a long and flat belt body 4. As a method for joining the strands 3, as shown in FIG. 5A, the belt body 4 can be formed by weaving using the weft yarn 5.

Further, as shown in FIG. 5 (B), the belt body 4 can be formed by sewing using the weft thread 5, and as shown in FIG. It is also possible to dispose the weft yarns 5 in a shape crossing the strands 3 and heat-bond them to the strands 3 or to join them using a hot melt agent.

As a material for forming the weft yarn 5, high-density polyethylene, polypropylene, polyester, polyamide and polyaramid can be used, and a uniaxially stretched material is used.

As shown in FIG. 5 (C), when joining the flat ribbon-shaped weft yarn 5, a laminated body in which a thermoplastic resin having a low melting point is laminated on both sides of the stretched ribbon-shaped body is used. be able to. It is desirable that the weft yarn 5 is cross-linked using a cross-linkable thermoplastic resin.

Further, the flat belt body 4 can be formed by knitting the strands 3, forming a net, or braiding the strands according to the purpose.

The width of the belt body 4 is not particularly limited, but is generally 1 to 20 cm for a belt body used in a vertical direction, and is used in a vertical direction for a belt body used in a horizontal direction. A belt that is thinner than the belt body can be used, and is generally 0.5 to 10 cm.

The surface of the obtained belt body 4 can be laminated with a thermoplastic resin layer or coated with a thermoplastic resin emulsion or rubber latex. As the thermoplastic resin laminated on the surface of the belt body 4, low-density polyethylene, high-density polyethylene, ethylene-propylene copolymer, polyester, polyamide, or the like can be used.

The thus obtained belt bodies 4 are arranged side by side in the vertical and horizontal directions, and the intersections thereof are bound to form the reinforcing embankment sheet 1.

As a method of forming the reinforcing embankment sheet 1, the vertical belt members 4a are arranged in one direction. In this case, the vertical belt members 4a may be closely arranged with a small interval. However, as shown in FIG. 1A, the vertical belt members 4a are arranged side by side at intervals and are orthogonal to the vertical belt members 4a. It is desirable that the horizontal belt members 4b are arranged side by side in the direction, whereby an opening is formed in the reinforcing embankment sheet 1 so that the embankment above and below the sheet can be integrated. It is desirable that the intervals between the vertical belt members 4a are arranged to be denser than the width of the horizontal belt members 4b.

As shown in FIG. 1A, the combination structure of the belt members 4 may be a lattice shape in which horizontal belt members 4b are overlapped so as to intersect the vertical belt members 4a arranged in parallel. As shown in FIG. 1 (B), the horizontal belt 4b is overlapped so as to intersect with the vertical belt 4a arranged in parallel, and the vertical belt 4a is further attached to the vertical belt 4a.
It is also possible to adopt a sandwich structure arranged in parallel along the line a.

Further, as shown in FIG. 2, it is a desirable method to dispose a belt member 4c in an oblique direction as required.

When it is necessary to enhance drainage,
A drainage material 6 such as a nonwoven fabric can be provided. Drainage material 6
As shown in FIG. 3, the drainage material 6 cut into a belt shape can be provided along the vertical belt body 4a. The drainage material 6 may be provided on one side of the reinforcing embankment sheet 1, may be provided on both sides, or may be interposed between the belt bodies 4 to form a sandwich structure. In addition, 4b is a strip for suppressing the drainage material 6.

As the molding material of the drainage material 6, polyethylene, polypropylene, polypropylene, polyester,
Polyamide, polyacryl, or the like can be used, and can be obtained by forming these fibers into a nonwoven fabric.

The intersections of the belt members 4 thus stacked are bound. As a method for binding the intersections of the belt body 4, the intersections can be sewn with the tying thread 7, and the sewing is performed as shown in FIG.
It can be sewn in a straight line horizontally, vertically or diagonally, and as shown in FIG.
May be sewn along and turned back at the intersection to reinforce. Furthermore, it can also be tied by circular sewing at the intersection. It is also possible to join with a hot melt agent.

Thus, the reinforcing embankment sheet 1 is obtained by binding the vertical belt 4a and the horizontal belt 4b. The reinforcing embankment sheet 1 thus obtained can be formed by laminating a thermoplastic resin on the surface of the vertical belt body 4a or coating a thermoplastic resin emulsion or rubber latex as necessary. Alternatively, the rigidity of the sheet 1 can be improved by coating with rubber.

When embankment is performed using the reinforcing embankment sheet 1 obtained as described above, as shown in FIG. 8A, the embankment is carried into a construction site and laid at a position where embankment should be performed. If necessary, the sheet 1 can be fixed by the locking members 10 and 10. Clips, U-pins, stakes, bars, and the like can be used as the locking tools 10 and 10.

Embankment is performed on the reinforcing embankment sheet 1 laid in this manner. The height of the embankment of one layer can be obtained by calculation from the tensile strength in the longitudinal direction of the sheet 1, the soil quality, the expected earth pressure, and the like. The length of the sheet 1 in the longitudinal direction is set to a length sufficiently deeper than an expected arc sliding surface so that the sheet 1 has a sufficient fixing length so that the sheet 1 is not pulled out from the embankment by the earth pressure due to the arc sliding of the sheet 1. Will be considered.

In the embankment work according to the present invention, as shown in FIG. 8A, the sheet 1 is laid flat so that one end of the sheet 1 reaches the slope where the one end is formed, and the embankment is laid thereon. After laying the sheet 1 again and repeating the process of embankment being performed on the sheet 1 a predetermined number of times and stacking the sheets, the cultivation floor of a required height is performed, and if necessary, the plant cultivation floor,
Alternatively, the slope protection material 8 such as a concrete block is applied to protect the slope. In this case, the slope protection material 8 can be stabilized by connecting it to the slope-side end of the reinforcing embankment sheet 1.

When the slope is protected by the reinforcing embankment sheet 1, as shown in FIG.
Is laid so that it protrudes forward from the slope, and the embankment is laid at the position where embankment is to be performed. Then, the sheet 1 that protrudes forward from the slope is lifted upward so as to cover the slope, and is laid on the embankment. Then, the step of laying the sheet 1 thereon and performing the embankment is repeated a required number of times, and the embankment is performed.

When the drainage function is required for the reinforcing embankment sheet 1 of the present invention, a sheet to which a nonwoven fabric is added may be used, or a belt body whose surface is not coated with a thermoplastic resin or the like. It is desirable to use No. 4, whereby water in the embankment can be discharged to the slope of the embankment through the sheet 1, and the embankment can be stabilized early.

[0041]

EXAMPLES (Example 1) A film was formed from polypropylene (manufactured by Nippon Polychem Co., Ltd.) by an inflation molding method using a melt extruder, and slit using a razor. The temperature of the slit resin tape is 110-120 ° C
After stretching 7 times on a hot plate, a 6% relaxation heat treatment was performed in a hot air circulating oven at a temperature of 120 ° C., and the film was wound around a winder. The single fiber fineness of the obtained drawn tape is 330.
0 dt, and the yarn width was 17 mm.

The obtained stretched tapes were aligned in parallel using the number shown in Table 1, and were woven by a weaving machine using a polypropylene monofilament of 1100 dt to obtain a tape having a width of 25 to 30 mm as shown in Table 1. A belt was obtained.

The obtained belt body was 14 belts / m, or
The horizontal belt members were arranged in parallel at an interval of 18 / m at an interval of 10 / m in a direction perpendicular to the preceding belt member at the upper portion thereof, and the intersections thereof were sewn and bound. In Examples 4 to 6, the vertical belt body was further arranged in parallel on the horizontal belt body to form a sandwich structure. Table 1 shows the results of testing the properties of the obtained sheet for reinforcing embankment.

[0044]

According to the present invention, since the present invention has such a structure, it can be used for a lower bottom portion of a high embankment work having a high tensile strength in a vertical direction and a large earth pressure, and has a resistance to a pulling force. Strongly, it is possible to effectively prevent the occurrence of arc sliding of the embankment.

Further, a sheet capable of integrating the upper and lower soils can be obtained, and good compaction can be obtained. Further, the present invention can provide a drainage function, and water in the embankment is led out. A strong and stable embankment can be formed.

[0046]

[Table 1]

[Brief description of the drawings]

FIG. 1 is a perspective view showing a sheet for reinforcing embankment of the present invention.

FIG. 2 is a plan view showing another example of a sheet for reinforcing embankment.

FIG. 3 shows still another example of a sheet for reinforcing embankment,
(A) is a side view, (B) is a plan view thereof.

FIG. 4 is a perspective view showing a configuration of a belt body.

FIG. 5 is an explanatory view showing a method of joining strands.

FIG. 6 is a plan view showing a method of connecting intersections of a belt body.

FIG. 7 is a perspective view showing a conventional civil engineering sheet.

FIG. 8 is a longitudinal sectional view showing an example of construction using a sheet for reinforcing embankment.

[Explanation of symbols]

 1: Sheet for reinforcing embankment 3: Strand 4: Belt body 4a: Vertical belt body 4b: Horizontal belt body 5: Weft yarn 6: Drainage material 7: Coupling yarn 8: Slope protection material 10: Locking tool

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2D044 CA04 CA05

Claims (13)

[Claims] 1. A long and flat belt body is formed by combining a plurality of strands formed by uniaxially stretching a synthetic resin.
A sheet for reinforcing embankment characterized by combining the belt bodies vertically and horizontally and binding intersections. 2. The reinforcing embankment sheet according to claim 1, wherein the strand made of a synthetic resin is a film-like body which is uniaxially stretched. 3. The reinforcing embankment sheet according to claim 1, wherein the synthetic resin strand is made of monofilament. 4. The belt body according to claim 1, wherein the belt body is formed by weaving synthetic resin strands arranged in a longitudinal direction by using a weft thread or sewing the strands in a lateral direction. A sheet for reinforcing embankment as described. 5. The belt according to claim 1, wherein the belt body is arranged so that the ribbon-shaped wefts intersect the synthetic resin strands arranged in the longitudinal direction, and the intersections are bonded. A sheet for reinforcing embankment as described. 6. The reinforcing embankment sheet according to claim 1, wherein the belt body has a film formed on the surface thereof. 7. A vertical belt member is arranged in parallel at intervals, and a horizontal belt member is arranged in parallel in a direction perpendicular to said belt member at intervals, and intersections thereof are connected.
7. The sheet for reinforcing embankment according to any one of 6. 8. A vertical belt body is arranged in parallel at intervals.
On top of this, a horizontal belt is arranged in parallel in a direction orthogonal to the belt at intervals, and a vertical belt is further arranged thereon at a position corresponding to the lower vertical belt, and the intersections are connected. The sheet for reinforcing embankment according to any one of claims 1 to 6, which is worn. 9. The reinforcing embankment sheet according to claim 7, wherein the interval between the belt members is larger than the width of the belt member. 10. The reinforcing embankment sheet according to claim 1, wherein intersections of the vertical belt body and the horizontal belt body are connected by sewing. 11. The reinforcing embankment sheet according to any one of claims 1 to 9, wherein intersections of the vertical belt body and the horizontal belt body are bonded by heat fusion. 12. The reinforcing embankment sheet according to claim 1, wherein a film is formed on the surface of the vertical belt body bound at the intersection with the horizontal belt body of the reinforcing embankment sheet. 13. The sheet for reinforcing embankment according to claim 1, wherein a nonwoven fabric is added to the sheet for reinforcing embankment.