JP2002054103A - Cellular structure and paving structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cellular structure, which can be covered uniformly with soil, in which a caving position can be discovered rapidly even when the caving is generated, and which can resist load by itself even when the cellular structure is exposed, and a paving structure using the cellular structure. SOLUTION: In the cellular structure 11 with a plurality of cells 13 enclosed by partition walls 12 in the vertical direction, a plurality of pressure-resistant projections 14 being projected upwards from the partition walls 12 and having pressure-receiving sections 15 brought into contact with a subbase course in bottom sections are disposed upright at regular intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cellular structure and a pavement structure, and more particularly, to a cellular structure suitable for paving a parking lot or a ground by using granular materials such as soil, gravel, sand, and crushed stone. The present invention relates to a pavement structure using the cellular structure and the cellular structure.

[0002]

2. Description of the Related Art As a roadbed stabilizer for supporting a heavy load, a cell-type plastic panel as disclosed in Japanese Patent Application Laid-Open Nos. 2-229303 and 2-229304 is generally used. This cell-type plastic panel is formed by laminating a number of strips and joining adjacent strips alternately at predetermined intervals, and is installed in a construction site with the strip width direction facing up and down, It has a structure in which a large number of cells (voids) surrounded by an adjacent band are formed when the cell is stretched in a direction perpendicular to the width direction of the band. The cells thus formed are filled with particulate matter such as gravel.

A cellular structure such as a cell-type plastic panel disperses a load for moving ground soil from the surface of the ground or restricts particulate matter in a cell to move the ground soil. And stabilization. Therefore, even when a temporary road or a pavement road is formed on a soft ground by a vehicle, heavy equipment, or the like, the pavement of the road surface is performed using the roadbed stabilizing material, so that a solid roadbed that is unlikely to be rutted or collapsed. In addition to this, there is an advantage that the thickness of the roadbed can be reduced, and a high-strength roadbed can be formed even when the roadbed is filled with low-level earth and sand or gravel, and the construction cost can be reduced.
This effect is also effective when covering or paving on the roadbed.

[0004]

However, when soil is covered on the roadbed using the above-mentioned cellular structure, if the soil is adequate and constant, the effect of preventing ruts and depressions can be sufficiently achieved. However, if the cover soil thickness is too deep or varies, these effects may not be sufficiently obtained. In addition, on a pavement surface using such soil, when used for a relatively long time, for example, in a temporary parking lot, when it is used as a ground during periods other than the period when it is used as a parking lot, and when a parking lot is used, vehicle traffic It is necessary to hold the roadbed by the cellular structure in order to withstand the heat. On the other hand, when it is used as ground, flatness of the surface is required.

[0005] However, even when the roadbed is stabilized by the cellular structure, a rut is formed due to shaving or sinking of the covering portion during use for many years, and in some cases, the cellular structure may be formed. It may itself be exposed on the surface.
In such a state, it becomes difficult to use the ground.

In a cellular structure, when the cells are filled with earth and sand, etc., the structure and the earth and sand are integrated to obtain sufficient strength, but the earth and sand have flowed out. In such a case, the structure itself may not be strong enough to withstand the load of a vehicle or the like, so that the structure may be damaged. Therefore, it is necessary to find a depressed portion at an early stage before such a state and repair it promptly. However, it is difficult to judge how much the depressed portion has been caused by the appearance.

Accordingly, the present invention makes it possible to uniformly cover the soil on the cellular structure, to quickly find the location of the depression when the depression occurs, and to make it possible to detect the location of the depression even when the cellular structure is exposed. It is an object of the present invention to provide a cellular structure capable of withstanding a load by itself and a pavement structure using the cellular structure.

[0008]

In order to achieve the above object, a cellular structure according to the present invention is a cellular structure having a plurality of cells surrounded by a vertical partition wall, the cell structure projecting above the partition wall. In addition, a plurality of pressure-resistant protrusions having a pressure-receiving portion at the bottom and in contact with the roadbed are provided upright at predetermined intervals.

Further, the pavement structure of the present invention is a pavement structure using the cellular structure having the above-mentioned structure, wherein the cellular structure is laid on a roadbed, and the cellular structure is provided in the void portion of the cellular structure. The method is characterized in that the granular material is filled and the granular material is spread 10 to 50 mm above the pressure-resistant projection.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing one embodiment of the cellular structure of the present invention, and FIGS. 2 and 3 are one embodiment of a pavement structure using the cellular structure of the present invention. FIG. 2 is a longitudinal sectional view showing a pavement state in which a granular material is filled in a cellular structure, and FIG. 3 is a longitudinal sectional view showing a state in which a concave portion is generated in a surface layer.

First, the cell-like structure 11 is composed of a plurality of partition walls 12 with the width direction of the belt-like plate directed vertically, and the partition walls 12.
And a plurality of pressure-resistant protrusions 14 protruding above the partition walls 12. The thickness and height of the partition 12 and the size of the cell 13 can be arbitrarily set according to the purpose of use of the cellular structure 11 and the granular material used at the time of pavement.
Has a thickness of about 1 to 3 mm, a height of about 10 to 100 mm, and a size of the cell 13 of 10 to 100 mm × 10 to 1
About 00 mm is appropriate.

The pressure-resistant projection 14 has a truncated conical shape with an expanded lower part, and a large-diameter disk-shaped pressure-receiving part 15 in contact with the roadbed is provided at the bottom. This pressure-resistant protrusion 1
4 and the pressure receiving portion 15 have a larger load resistance as the size thereof is increased. However, in consideration of the filling property of the granular material at the time of pavement, drainage of rainwater, the relationship between the roadbed and the soil cover, etc., the bottom area of the pressure receiving portion 15 is ,
It is preferable that the thickness be equal to or less than 80% of the bottom area of the cellular structure 11.

In this embodiment, the cell 13 is formed in a substantially square shape in plan view surrounded by four partition walls 12 and four pressure-resistant projections 14 provided at the intersections of the partition walls 12. , The shape of the cell 13 is arbitrary, and at least three partitions 12
Can be formed into a polygonal shape such as a hexagon or an octagon from a triangular shape in a plan view surrounded by a circle.

The area of the pressure-receiving surface 14a above the pressure-resistant protrusion 14 and the interval between the pressure-resistant protrusions 14 can be appropriately set according to the purpose of the granular material to be filled in the cell 13, the use purpose of the pavement surface, and the like. . In addition, it is desirable that the pressure-resistant protrusions 14 are arranged at regular intervals at regular intervals, and in consideration of the strength of the partition walls 12 and the pressure-resistant protrusions 14 and the shape retention of the cells 13,
It is optimal to be provided at each intersection of the partition walls 12 in the vertical direction. However, it is not necessary to provide them at all the intersection points of the partition walls 12, and they may be provided at portions other than the intersection points. At an appropriate position and in an appropriate shape.

The cellular structure 11 has mechanical strength such as compression resistance, tensile strength, and bending rigidity to withstand the load of a vehicle or the like, and is made of various materials that can withstand outdoor use. It can be formed integrally by using
It is optimal to integrally mold with a synthetic resin such as polypropylene, polyethylene, ABS, polyvinyl chloride, and FRP, which has excellent mechanical strength, and also has excellent lightness, moldability, and stability in soil. Further, the overall shape can be arbitrarily set by a molding method, and for example, can be formed in a mat shape with one side of about several tens cm.

As shown in FIG. 2, a pavement structure using the cellular structure 11 formed as described above is constructed by substituting the cellular structure 11 with a subgrade 16 on which a predetermined subgrade construction such as uneven land adjustment is performed.
The pressure receiving part 15 is laid on the
The intervening cell 13 is filled with a granular filler 17 such as soil, gravel, sand, crushed stone, and the like, and the granular substance 17 is laid 10 to 50 mm above the pressure-resistant projection 14.

At this time, in order to cover the cell-shaped structure 11 with a constant thickness, the granular material 17 is once filled with the pressure-receiving surface 14a of the pressure-resistant projection 14 as a guide, and then the pressure-receiving surface 1
By further covering the soil to a degree that covers 4a thinly,
Using the pressure-resistant protrusions 14 as a guide, the soil can be uniformly covered on the cellular structure 11.

The granular material 17 thus filled and covered with soil is
Has a constant thickness with respect to the upper end of the partition wall 12. When a load is applied by the wheels 18 on the upper end of the partition wall 12, a force for moving the soil caused by the load is uniformly applied to each cell 13. The effect of stabilizing the roadbed can be obtained.

Further, even if the collapse or the like can be prevented by stabilizing the roadbed, when used for a long period of time, the soil of the surface layer gradually moves or the voids of the soil are compressed, and so on.
The concave portion 19 as shown in FIG. 3 may be generated on the surface layer. At this time, the pressure receiving surface 14a at the upper end of the pressure-resistant protrusion 14
Is higher than the upper end of the partition wall 12,
First, the pressure receiving surface 14a is exposed on the surface.

When a load due to the wheel 18 acts on such a concave portion 19, the load is applied to the pressure-resistant projection 14 and the pressure-receiving portion 1.
5, the load does not directly act on the partition 12, and the partition 12 is not damaged. Also, in this state, the granular material 17 located below the pressure receiving surface 14a is unlikely to be compressed or moved, so that the concave portion 19 can be prevented from expanding downward.

As described above, the recess 1 is formed by the pressure-resistant protrusion 14.
9 can be minimized, but it is not preferable to leave such a concave portion 19 for a long period of time. Therefore, it is necessary to find out the occurrence of the concave portion 19 at an early stage and repair it. Even in this case, since the pressure receiving surface 14a on the upper surface of the pressure-resistant protrusion 14 is exposed in the concave portion 19, the presence of the concave portion 19 can be easily confirmed by visual observation.

[0022]

EXAMPLE In a crushed stone-paved parking lot of about 200 cars, crushed stone pavement was performed using a cellular structure at an intersection of a passage where a rut easily occurs. The cellular structure is
Polypropylene is formed by injection molding and integrally molded. Partitions having a thickness of 2 mm and a height of 30 mm are arranged in a grid pattern at intervals of 60 mm. Each intersection of the partitions has a height of 70 mm and a diameter of a pressure-receiving surface of 20 mm. A pressure-resistant projection in the shape of a hollow truncated cone with a pressure-receiving portion diameter of 40 mm was installed. The overall shape of the cellular structure is a square with a side of 500 mm, and each side is provided with a connecting portion for connecting adjacent structures. The compressive strength of the polypropylene cellular structure (500 mm square) exceeds 400 kN / sheet, and has sufficient strength to withstand a 25-ton vehicle.

A predetermined number of the cell-like structures are laid on a flat crushed stone bed which has been sufficiently compacted in a state of being connected vertically and horizontally, and the cells are filled with crushed C-30 stones. The surface was flattened and rolled up to 30 mm above.

One month after the construction, the state of the occurrence of the rut was examined. As a result, the part constructed using the cellular structure was almost flat, and a little rut was seen, but the rut depth was the maximum. Was about 10 mm. On the other hand, in the portion where the cellular structure was not used, a large number of ruts were confirmed, and the rut depth was about 30 mm on average, and some ruts exceeded 50 mm at maximum.

Also, assuming that the cellular structure was exposed, the crushed stone was filled so that the pressure-receiving surface of the pressure-resistant projection was exposed. One month later, the state of this portion was confirmed, but no damage was observed in the cellular structure, and the rut did not expand below the pressure-resistant protrusion.

Therefore, by performing pavement using crushed stones using the cellular structure, it is possible to reduce the occurrence of depressions and ruts on the ground surface due to the traffic of vehicles, and even if the cellular structure is exposed, the pressure resistance is reduced. By supporting the vehicle with the projections, it is possible to prevent the cellular structure itself from being damaged, and to prevent the depression and the rut from expanding downward.

[0027]

As described above, in the cell-shaped structure of the present invention, since the pressure-resistant projections protrude above the partition walls forming the cells, the soil is uniformly covered on the cell-shaped structure using the pressure-resistant projections as a guide. It is possible to do. Also, when pavement is performed with granular material using this cellular structure, the movement of the granular material can be suppressed to reduce the occurrence of depressions and ruts. Can be found. Furthermore, even when the cellular structure is exposed, the pressure-resistant projections support the load, so that the cellular structure can be prevented from being damaged, and the depression or the like can be prevented from further progressing.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing one embodiment of a cellular structure of the present invention.

FIG. 2 is a longitudinal sectional view showing one embodiment of a pavement structure using the cellular structure of the present invention.

FIG. 3 is a longitudinal sectional view showing a state in which a concave portion is generated in a surface layer.

[Explanation of symbols]

11: Cellular structure, 12: Partition wall, 13: Cell, 14 ...
Pressure-resistant protrusion, 14a: pressure-receiving surface, 15: pressure-receiving portion, 16: roadbed, 17: filler, 18: wheel, 19: concave portion

Claims (2)

[Claims] In a cellular structure having a plurality of cells surrounded by vertical partition walls, a plurality of pressure-resistant projections projecting above the partition walls and having a pressure-receiving portion at the bottom and in contact with a roadbed are formed at predetermined intervals. A cellular structure characterized by being erected. 2. A pavement structure using the cellular structure according to claim 1, wherein the cellular structure is laid on a roadbed, and the voids of the cellular structure are filled with particulate matter. At the same time, the granular material is 10 to 50 mm from the pressure-resistant protrusion.
Pavement structure characterized by being laid to the top.