JP2016113795A - Belt-like tension member for use in reinforcement soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt-like tension member for use in reinforcement soil, which can obtain a frictional resistance force equal to or greater than that of a belt-like steel tension member.SOLUTION: A belt-like tension member includes a belt part 11, and a plurality of nipping belts 12 that are flatly formed at intervals on a surface of the belt part 11. A nipping space 13 is formed between the nipping belts 12 and 12, and a resistance surface 12a is formed on a side surface of the nipping belt 12 facing the nipping space 13.SELECTED DRAWING: Figure 5A

Description

  The present invention relates to a belt-like tensile material used by being embedded in earth and sand, and more particularly to a belt-like tensile material made of a polymer material having a high frictional resistance with earth and sand.

As represented by the tail arme method, a reinforced earth structure that connects one end of a steel strip tension material to the back of a concrete panel and embeds the steel strip tension material extended to the back of the panel in the earth and sand is Widely known.
Patent Document 1 discloses that a flexible belt-shaped tensile material formed of a polymer material that is light and does not rust is used instead of the steel belt-shaped tensile material.
Patent Document 2 discloses a belt-like tensile material made of a polymer material in which both sides are formed in a wave shape to increase the frictional resistance.
Referring to FIG. 7, a belt-like tensile member 50 made of a polymer material is flat and has a central portion 51 formed in a uniform thickness, and a plurality of belt-like tensile members 50 formed in a wavy shape extending over the left and right sides of the central portion 6 with a predetermined interval. The friction blades 52 are provided.

JP 2006-152786 A Special table 2011-513611 gazette

The conventional belt-like tensile material has the following points to be improved.
<1> Since the frictional resistance of the belt-like tension member 50 is exclusively obtained from the friction blade 52, it is necessary to lengthen the protruding amount of the friction blade 52 in order to increase the frictional resistance.
If the protruding amount of the friction blade 52 is lengthened, the strength is insufficient and the shape is easily deformed, so that there is a limit to increasing the frictional resistance.
<2> As a method of simply increasing the frictional resistance of the belt-like tensile material 50, it can be assumed that the surface is formed into a rough surface.
However, since the polymer material (resin material), which is the material of the belt-like tensile material 50, has a relatively soft characteristic, the rough surface is roughened in an environment where an excessive soil weight acts on the surface of the belt-like tensile material 50. It is difficult to function effectively.
<3> Although the belt-like tension member 50 has an increased frictional resistance as compared with a uniform width without the friction blades 52, it has a large pull-out resistance because the frictional resistance is insufficient as compared with a conventional steel belt-like tensile member. It is technically difficult to give
Therefore, it is desired to propose an improved technique for increasing the pulling resistance of the belt-shaped tensile material made of a polymer material.

  The present invention has been made in view of the above points, and the object of the present invention is to provide a belt-like tensile material used for reinforcing soil, which can obtain a friction resistance equal to or higher than that of a steel belt-like tensile material. It is to provide.

The present invention is a belt-like tensile material made of a polymer material used for reinforcing soil, and has a uniform width and thickness, and a predetermined interval on one or both surfaces of the upper and lower surfaces of the belt portion. A plurality of sandwiching bands integrally formed by raising flatly across the plurality of sandwiching bands, forming a sandwiching space capable of accommodating compacted earth and sand between the plurality of sandwiching bands, and forming the sandwiching band in the longitudinal direction of the band part The sandwiching body has a length in the longitudinal direction that is equal to or greater than the thickness of the band portion, and a resistance surface is formed on a side surface of the sandwich band facing the sandwiching space. To do.
In another embodiment, the plurality of sandwiching bands are formed continuously or intermittently along a direction intersecting the longitudinal direction of the band part.
In another embodiment, the plurality of holding bands are formed in a staggered pattern on the surface of the band part with a predetermined interval.
In another form, the cross-sectional shape of the holding band which cuts the band part vertically is rectangular.
In another form, the cross-sectional shape which cuts through the holding band has a wedge shape.

  The strip-shaped tensile material according to the present invention can obtain a frictional resistance equal to or greater than that of a steel strip-shaped tensile material.

Explanatory drawing which applied the beltlike tension material concerning the present invention to the reinforced earth structure Sectional view of II-II in FIG. Explanatory drawing of the dimensional relationship of a strip-shaped tensile material equipped with a holding band having a rectangular cross section Explanatory drawing of the dimensional relationship of a strip-shaped tensile material with a holding band that exhibits a wedge-shaped cross section Enlarged view of the surface of the strip tension material to explain the pulling resistance of the strip tension material Explanatory drawing of the strip | belt-shaped tension | tensile_strength material which concerns on Example 1 which comprised the clamping band which exhibits a rectangular cross section. Explanatory drawing of the strip-shaped tension material which concerns on the modification 1. Explanatory drawing of the strip-shaped tension material which concerns on the modification 2. Explanatory drawing of strip-shaped tension material concerning modification 3 Explanatory drawing of the strip | belt-shaped tension | tensile_strength material which concerns on Example 2 which comprised the clamping band which exhibits a wedge-shaped cross section. Explanatory drawing of the strip-shaped tension material which concerns on the modification 1. Explanatory drawing of the strip-shaped tension material which concerns on the modification 2. Explanatory drawing of strip-shaped tension material concerning modification 3 Explanatory drawing of conventional strip-shaped tensile material

  Embodiments of the present invention will be described below with reference to FIGS.

<1> Strip-shaped Tensile Material Describing with reference to FIG. 1, the strip-shaped tensile material 10 is integrally connected to a wall surface material 20 such as a concrete panel, and the entire surface of the wall surface material 20 is horizontally extended. By embedding in the backside earth and sand 30, the earth and sand 30 is reinforced, and a reaction force is obtained from the earth and sand 30 to support the wall surface material 20.
As a means for connecting the belt-like tension member 10 and the wall surface member 20, for example, as shown in the figure, an intermediate portion of the belt-like tension member 10 is folded back into a loop shape and embedded in the housing of the wall member 20, or inserted and connected. The two strip-shaped tension members 10 extended from the back surface of the wall material 20 are horizontally arranged and embedded in the earth and sand 30.

The belt-like tensile material 10 is a tensile material formed of a polymer material, and has a predetermined width on one side or both sides of a continuous belt portion 11 having a uniform width and thickness and upper and lower surfaces 11a and 11b of the belt portion 11. And a plurality of sandwiching bands 12 formed to be spaced apart from each other.
A clamping space 13 is formed between the plurality of clamping bands 12.
The plurality of sandwiching bands 12 are integral with the band part 11 and are formed in a crossing direction with respect to the longitudinal direction of the band part 11.
The lateral width and the total length of the belt-like tensile material 10 are appropriately selected in consideration of the extraction resistance required for the belt-like tensile material 10.

<2> Band Part When described with reference to FIGS. 1 and 2, the band part 11 is a flat band plate having flexibility, and has a predetermined tensile strength required for the band-shaped tensile material 10.
The belt portion 11 is configured by covering the periphery of a core material 14 such as a chemical fiber disposed along the longitudinal direction of the belt-like tensile material 10 with a resin film 15.

<2.1> Strip Material As the core material 14, for example, a continuous polymer fiber mainly composed of polyester, polyamide, polyvinyl alcohol (PVA-L), polyolefin, or the like can be used.
As the resin film 15, for example, a resin whose main component is polyethylene, polypropylene, linear low density polyethylene (LLDPE), PVC, or the like can be used.
Moreover, the belt | band | zone part 11 contains what formed the whole cross section with the single polymer material besides the above-mentioned material.

<3> Nipping Band In this example, a mode in which the holding band 12 is formed on the upper surface 11a and the lower surface 11b of the band portion 11 will be described.
The sandwich band 12 is a protrusion having a substantially rectangular cross section formed over almost the entire width of the band portion 11, and is integrally formed of the same material as the resin film 15.
A sandwiching space 13 having a rectangular cross section is defined between the sandwiching bands 12 adjacent to each other in the longitudinal direction.
A resistance surface 12 a is formed on the upright side surface of the holding band 12 facing the holding space 13.

<3.1> Functions of the sandwiching band and the sandwiching space The sandwiching band 12 not only increases the surface area of the belt-like tensile material 10 in contact with the earth and sand 30 and increases the frictional resistance, but also compacts the soil particles in the sandwiching space 13. It functions to pinch hardened soil blocks.
The clamping space 13 functions to accommodate the compacted and hardened soil mass.

<3.2> Arrangement form of the holding band on the upper and lower surfaces of the band part In this example, the upper and lower holding bands 12 formed on the upper and lower surfaces 11a and 11b of the band part 11 are shifted left and right. The band 12 may be formed at the same position.

<3.3> Dimensions of the holding band 12 A dimension relationship of the holding band 12 having a rectangular cross section will be described with reference to FIG. 3A.
When the thickness of the band 11 is t ₁ , the thickness t ₂ of the holding band 12 has a relationship of t ₁ ≧ t ₂ .
The relationship between the axial length b ₁ of the holding band 12 and the interval b ₂ of the holding space 13 is b ₁ ≧ 2 × t ₂ .
The relationship to ensure the strength of Kyojitai 12, axial length b ₁ of Kyojitai 12 may have a thickness of more than twice the length of t ₂ of the clamping band 12.
Interval _{b 2} in the clamping space 13 is approximately the range of 50mm~100mm is desirable.

<3.4> Strength of the holding band When a pulling force is applied to the band-shaped tensile material 10, a shearing force is applied to the holding band 12 in contact with the compacted soil mass. The holding band 12 precedes the resin film 15. It is strong enough not to break.
Considering the actual phenomenon in which the belt-like tensile member 10 near the wall surface is extended, the upper and lower protruding holding belts 12 arranged in the same 1.0 m range with respect to the tensile load corresponding to the design tensile strength in the range of about 1.0 m. It is necessary to be able to ensure shear resistance at the contact surface with the base material.
Therefore, when the tensile strength of the base material constituting the holding band 12 is Ta, and the shear strength at one contact surface between the holding band 12 and the base material is S, the strength of the holding band 12 is, for example, {1. 0m / (b ₁ + b ₂ )} × S ≧ Ta.
The above is an example, and is not limited to this dimensional relationship.

<4> Pull-out Resistance of Strip-shaped Tensile Material With reference to FIG.
FIG. 4 is an enlarged view of the surface of the belt-like tensile member 10 embedded in the earth and sand 30, and a plurality of sandwiching bands 12 and sandwiching spaces 13 are alternately formed on the surface of the belt-like tensile member 10.
Since the earth and sand 30 is compacted by rolling pressure and its own weight at the time of embankment, the earth particles enter the holding space 13 of the belt-like tensile material 10 and the entire upper surface 11a and the lower surface 11b are in contact with the earth and sand 30 in a pressed state. Facing.
In the strip-shaped tensile material 10, the following plural factors act as the pulling resistance force.

<4.1> Pull-out resistance of strip-shaped tensile material due to frictional force When pulling force is applied to strip-shaped tensile material 10, the surfaces of upper and lower surfaces 11a, 11b of strip-shaped tensile material 10 formed in an uneven shape, The surface frictional force f ₁ with the earth and sand 30 in contact with this resists drawing of the belt-like tensile material 10.
Furthermore, sediment frictional force f ₂ occurring between the consolidation sand 31 which is hardened is compressed by pinching space within 13 and the outer side of the sediment to resist withdrawal of the belt-shaped tension member 10.
Furthermore, since the soil particles near the surface layer of each of the upper and lower surfaces 11a and 11b of the belt-like tensile material 10 are consolidated to form a hard compacted soil layer 32, the compacted soil layer 3231 and its outer side. The earth and sand frictional force f ₃ generated with the earth and sand 30 resists pulling of the belt-like tensile material 10.

<4.2> Pull-out resistance of the belt-shaped tensile material due to the sandwiching of the earth and sand As described above, the earth and sand 30 located in the sandwiching space 13 is formed between the resistance surface 12a of the adjacent sandwiching bands 12 and 12, and the band portion 11 It hardens | cures by pressurizing in the state pinched | interposed with the surface, and the compacted earth and sand 31 is formed.
Part of the hardened compacted earth and sand 31 comes into contact with the resistance surface 12a of the holding band 12 and resists.
Thus, in addition to the fact that the strip-shaped tension member 10 can obtain the pulling resistance force due to the above-described three types of frictional forces f ₁ , f ₂ , and f ₃ , the compacted earth and sand in which the resistance surface 12 a of the sandwich band 12 is hardened. Since it effectively functions as the resistance surface 31, it is possible to obtain a pulling resistance equal to or higher than that of a conventional steel strip-like tensile material.

With reference to FIGS. 5A to 5D, an example of the belt-like tension member 10 in which the arrangement position of the holding band 12 having a rectangular cross section with respect to the band part 11 is changed will be described.
In the description of the following embodiments, the same parts as those described above are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 5A shows a belt-like tensile member 10 in which sandwiching bands 12 having a rectangular cross section are continuously formed along the transverse direction of the band part 11.
The pull-out resistance principle of the belt-like tension member 10 in this example and the dimensional relationship of the holding band 12 are as described above based on FIGS. 3A and 4.

[Modification 1]
FIG. 5B shows a modification of the belt-like tensile member 10 in which the sandwiching band 12 having a rectangular cross section is intermittently formed along the transverse direction of the band part 11.
In this example, the holding band 12 is constituted by a plurality of divided holding parts 12 ′ formed in a horizontal row at a predetermined interval with respect to the band part 11.
In the strip-shaped tensile material 10 of this example, not only the resistance surfaces 12a before and after the split sandwiching portion 12 'exhibiting a flat rectangular parallelepiped, but also the side surfaces 12b along the longitudinal direction orthogonal to the resistance surfaces 12a are used as friction resistance surfaces. Function.
Furthermore, since the space formed between the adjacent divided sandwiching portions 12 ′ and 12 ′ functions in the same manner as the previous sandwiching space 13, the belt-like tension member 10 can obtain a high pulling resistance.

[Modification 2]
FIG. 5C shows another modification of the belt-like tensile member 10 in which a plurality of sandwiching bands 12 are arranged in a staggered manner on the surface of the belt part 11.
Each of the holding bands 12 has a flat rectangular parallelepiped shape, and is arranged in the transverse direction and the longitudinal direction with a predetermined interval from the surface of the band part 11.
The number of holding bands 12 in the transverse direction and the longitudinal direction of the band part 11 is appropriately selected in consideration of the pulling resistance of the band-shaped tensile material 10 and the like.
Even in the belt-like tensile material 10 of this example, a high pulling resistance can be obtained.

[Modification 3]
FIG. 5D shows another modified example of the belt-like tensile member 10 in which the holding band 12 having a rectangular cross section is continuously formed so as to obliquely intersect the longitudinal direction of the band portion 11.
This example is different from Example 1 only in the formation direction of the holding band 12, and the other configuration is the same as Example 1.
In this example, by forming the holding band 12 obliquely, it is possible to secure a large resistance area of the resistance surface 12a of the holding band 12 per one holding band 12 as compared to the first embodiment.

With reference to FIGS. 6A to 6D, an example of the belt-shaped tension member 10 in which the cross-sectional shape of the holding band 12 has a wedge shape with respect to the band portion 11 will be described.
The clamping band 12 in this example includes a resistance surface 12a that stands up from the surface of the band portion 11, and a slope 12c that gradually decreases in thickness from the top of the resistance surface 12a.
The belt-like tension member 10 in this example is different only in the cross-sectional shape of the holding band 12 as compared with the previously described form, and the dimensions of the holding band 12 and the pull-out resistance element of the belt-like tension member 10 are the same as those already described. .
3B shows the dimensions of the sandwiching band 12 having a wedge-shaped cross section in this example (thickness t ₁ of the band 11, thickness t _{2 of} the sandwiching band 12, axial length b _{1 of} the sandwiching band 12, and spacing b between the sandwiching spaces 13. ₂ ), the dimensions of the holding band 12 having a cross section are the same as the relationship of the holding band 12 having the rectangular cross section described above.
Further, when embedding the belt-like tension member 10 in the earth and sand, the resistance surface 12a of the holding belt 12 is used facing the back surface of the wall surface material.
In this embodiment, since the resin material can be saved by reducing the size of the holding band 12 by half compared to the first embodiment, the belt-shaped tensile material 10 can be obtained without sacrificing the pulling resistance of the belt-shaped tensile material 10. Can be produced economically.

  FIG. 6A shows a belt-like tension member 10 in which a wedge band 12 having a wedge-shaped cross section is continuously formed along the transverse direction of the band portion 11.

[Modification 1]
FIG. 6B shows a modified example of the belt-like tensile member 10 in which the wedge-shaped cross-sectional sandwiching band 12 is intermittently formed along the transverse direction of the belt part 11.
In this example, the holding band 12 is constituted by a plurality of divided holding parts 12 ′ formed in a horizontal row at a predetermined interval with respect to the band part 11.
In the belt-like tension member 10 of this example, the space formed between the adjacent divided sandwiching portions 12 ′ and 12 ′ functions in the same manner as the previous sandwiching space 13. Resistance can be obtained.

[Modification 2]
FIG. 6C shows another modified example of the belt-like tension member 10 in which the wedge bands 12 having the wedge-shaped cross-sections 12 are arranged in a staggered manner on the surface of the belt portion 11.
Each of the holding bands 12 has a flat rectangular parallelepiped shape, and is arranged in the transverse direction and the longitudinal direction with a predetermined interval from the surface of the band part 11.
The number of holding bands 12 in the transverse direction and the longitudinal direction of the band part 11 is appropriately selected in consideration of the pulling resistance of the band-shaped tensile material 10 and the like.
Even with the belt-like tensile member 10 of this example, a high pulling resistance can be obtained.

[Modification 3]
FIG. 6D shows another modified example of the belt-like tensile member 10 in which the wedge-shaped cross-section holding band 12 is continuously formed so as to obliquely intersect the longitudinal direction of the band portion 11.
This example is different from the second embodiment only in the formation direction of the holding band 12, and the other configuration is the same as the second embodiment.
In this example, by forming the holding band 12 obliquely, it is possible to secure a large resistance area of the resistance surface 12a of the holding band 12 per one holding band 12 as compared to the second embodiment.

DESCRIPTION OF SYMBOLS 10 ... Strip | belt-shaped tension | pulling material 11 ... Band part 12 ... Clamping band 12a ...... Resistance surface 12b of clamping band ...... Side surface 12c of clamping band ...... Clamping Slope 13 of the band 13 ··· Nipping space 20 ··· Ground 20 ··· Wall material 21 ··· Mounting bracket 22 ··· Connection bolt 30 ··· Sand 31 …… Consolidated soil 32 …… Consolidated block

Claims (5)

A belt-like tensile material made of a polymer material used for reinforced soil,
A strip having a uniform width and thickness;
A plurality of sandwiching bands formed integrally with one or both of the upper and lower surfaces of the band part and raised flatly at a predetermined interval on both sides,
Forming a holding space capable of accommodating compacted earth and sand between the plurality of holding bands;
Forming the holding band in a direction crossing the longitudinal direction of the band,
The sandwich body has a length along the longitudinal direction equal to or greater than the thickness of the belt portion,
A resistance surface is formed on a side surface of the holding band facing the holding space,
A belt-like tensile material used for reinforced soil.   The band-shaped tensile material used for the reinforcing soil according to claim 1, wherein the plurality of holding bands are formed continuously or intermittently along a direction intersecting the longitudinal direction of the band portion.   2. The belt-like tensile material used for reinforcing soil according to claim 1, wherein a plurality of sandwiching belts are formed in a staggered pattern at predetermined intervals on the surface of the belt portion.   The band-shaped tensile material used for the reinforced soil according to any one of claims 1 to 3, wherein a cross-sectional shape of a holding band that vertically cuts the band portion is rectangular.   The band-shaped tensile material used for the reinforcing soil according to any one of claims 1 to 3, wherein a cross-sectional shape that vertically cuts the holding band has a wedge shape.

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