JPH0449280Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a planar drainage material for guiding underground moisture to a side ditch or the like for drainage.

[Conventional technology]

Planar drainage materials, which are used as backfill drainage materials for tunnels, grounds, slopes, etc., form a passageway for groundwater inside the ground, and guide moisture from the surrounding ground collected in the passageway to gutters, etc. It has the role of draining water.

Conventional planar drainage materials are composed of a flat resin fiber aggregate of a predetermined thickness in which resin fibers are randomly gathered together.

[Problem that the invention attempts to solve]

Planar drainage materials are loaded onto the platform of a truck, transported to the construction site, and unpacked and installed at the construction site. When transporting planar drainage materials, there was a problem in that transportation costs were high. In addition, conventional planar drainage materials have a strong property of elastically returning to their original flat shape even if curved, and due to this property, there are cases where the construction surface is curved or wavy. There was also the problem that it was difficult to adapt to the construction surface and lacked workability.

The present invention solves these problems by providing a property that allows the shape to be maintained as it is after being expanded, contracted, or deformed into a curved or meandering shape, thereby reducing transportation costs. The purpose of the present invention is to provide a planar drainage material that can reduce the amount of water and improve workability during construction.

[Means for solving problems]

The means taken to achieve this purpose is that mountain folds and valley folds are alternately formed at multiple locations at predetermined intervals on each of the four walls of the hollow body having a rectangular cross section. , the mountain folds and the valley folds of each wall are continuous through the corner part of the hollow body, and at least one wall of the sloped wall portions on both sides sandwiching the mountain fold or the valley fold. The wall portion has elasticity, and when the valley fold portion is pushed into the mountain fold portion, the wall portion that has the elasticity pinches the mountain fold portion and is attached to other wall portions adjacent to this wall portion. The wall portion that overlaps and has elasticity when the valley fold portion is pulled out from the mountain fold portion and the other wall portion form a chevron-shaped cross-sectional shape with the mountain fold portion as the apex, Furthermore, water holes are provided in some or all of the four walls.

[Effect]

According to the planar drainage material having the above configuration, when the hollow body is pushed in the contraction direction and the valley fold portion is pushed into the mountain fold portion, the wall portion having elasticity bends against the elasticity. However, it is folded back to the inside or outside of another wall portion and overlapped, and the overlapping state is maintained as it is by the restoring force of the elastic wall portion. In addition, when the valley fold part is pulled out from the mountain fold part in a state where a wall part with elasticity and another wall part overlap, the wall part with elasticity bends against the elasticity. However, it is pulled out to the outside of the other wall parts, and the pulled out state is maintained by the restoring force of the elastic wall part. When the elastic wall part overlaps with another wall part, compared to when both wall parts do not overlap, the planar drainage material is made by a size corresponding to the overlap. is contracted. Such action can be performed not only on the entire circumference of the mountain fold and the valley fold, but also on the half circumference, so when the hollow body is deformed into a curved or meandering shape, the shape after deformation is is kept as is.

〔Example〕

FIG. 1 shows a planar drainage material 1 according to an embodiment of the present invention. This planar drainage material 1 has mountain folds 6 on each of four walls 2, 3, 4, and 5 of a hollow body having a rectangular cross section.
and valley folds 7 are formed alternately at a plurality of locations spaced apart from each other at regular intervals, and the mountain folds 6 of each wall 2, 3, 4, 5 and the valley folds 7 are formed at the corners of the hollow body. It is continuous through the parts. Further, each wall portion located between the mountain fold portion 6 and the valley fold portion 7 is divided into a wide wall portion 8 and a narrow wall portion 9. Further, the walls 2, 3, 4, 5 are provided with water holes 10 scattered therethrough. Such a planar drainage material 1 is easily formed by blow molding synthetic resin such as polyvinyl chloride resin or polyethylene resin, and by doing so, the walls 2, 3, 4, 5 are formed. It will have the necessary elasticity.

In FIG. 4, the contracted state of the planar drainage material 1 is shown by solid lines, and the extended state is shown by imaginary lines. In the contracted state of the planar drainage material 1, the valley fold part 7 is pushed into the mountain fold part 6, and the narrow wall part 9 is inside the wide wall part 8, as shown in FIG. are overlapping. When the planar drainage material 1 is stretched, the valley fold part 7 is pulled out from the mountain fold part 6 as shown in FIG. 3, and the wide wall part 8
and the narrow wall portion 9 form a chevron-shaped cross-sectional shape with the mountain fold portion 6 at the top.

Next, the action when expanding and contracting the planar drainage material 1 will be explained.

When the contracted planar drainage material 1 is to be expanded, the two parts of the hollow body are pulled apart in the direction shown by the arrow A in FIG. 3, and the valley fold part 7 is pulled out from the mountain fold part 6. In this way, when the valley fold part 7 is initially pulled out from the mountain fold part 6, the wide wall part 8 and the narrow wall part 9 bend against their respective elasticities, and the virtual plane including the valley fold part 7 is bent. passes through the virtual plane including the mountain fold 6, that is, the deflection width of the wide wall portion 8 and the narrow wall portion 9 reaches its maximum, and the mountain fold 6 and the valley fold 7 move in either the left or right direction. When passing through a neutral point where no pressure is applied, the valley fold portion 7 comes out of the mountain fold portion 6 due to the elastic restoring force of the wall portions 8 and 9. On the contrary, the elongated planar drainage material 1
When contracting, the two parts of the hollow body are pressed in the direction toward each other, and the valley fold part 7 is pushed into the mountain fold part 6. In this way, the valley fold part 7 becomes the mountain fold part 6.
When the wide wall portion 8 and the narrow wall portion 9 are initially pushed into the wall, they bend against their respective elasticity, and when they pass through the neutral point, the elastic restoring force of the wall portions 8 and 9 bends. The valley fold part 7 then enters into the mountain fold part 6. As is clear from this,
When the planar drainage material 1 is expanded or contracted, a snapping action is performed by the elastic restoring force of the wide wall portion 8 and the narrow wall portion 9 when the mountain fold portion 6 and the valley fold portion 7 pass through the neutral point. The planar drainage material 1 maintains its shape after contraction or expansion. Such action can be performed not only on the entire circumference of the mountain fold portion 6 and the valley fold portion 7, but also on the half circumference portion. By performing the above-mentioned action on the half circumferential portion of the mountain fold portion 6 and the valley fold portion 7, the planar drainage material 1 is bent into a dogleg shape as shown in Fig. 5a or curved as shown in Fig. 5b. It can be bent into a shape.

As described above, the planar drainage material 1 is stretchable and can be freely deformed into a curved or meandering shape, and also maintains its shape after expansion, contraction, and deformation, which makes it convenient for transportation. There are many advantages from both a construction and a construction standpoint. In other words, when loading a large number of planar drainage materials 1 onto a truck bed and transporting them to the construction site, by shrinking the planar drainage materials 1, it is possible to transport a large number of planar drainage materials 1 at once without adding bulk. This reduces transportation costs. On the other hand, if the construction surface is curved or wavy, construction can be easily carried out with the planar drainage material 1 deformed into a shape that follows the construction surface. For example, as shown in Figure 7, the tunnel T
When constructing the planar drainage material 1 as a backfill drainage material, the tunnel wall surface _T1 is often curved, but even in that case, the planar drainage material 1 is installed on the tunnel wall surface.
It can be deformed in advance to a shape along T ₁ and the deformed material can be constructed on the tunnel wall surface T ₁ . In addition, when the planar drainage material 1 is used for slope drainage, the ground is excavated to form a groove, and the planar drainage material 1 is embedded in the groove. The planar drainage material 1 becomes well adapted to the uneven shape.

FIG. 6 is a partially cutaway perspective view showing a state in which the planar drainage material 1 is covered with a water-permeable filter material 11 such as a nonwoven fabric. As shown in this figure,
When the planar drainage material 1 is covered with the filter material 11, only moisture is collected inside the planar drainage material 1 through the through holes 10 by the action of the filter material 11. Therefore, the through hole 10 is not clogged with foreign matter such as earth and sand, and good drainage performance is maintained over a long period of time. Note that the filter material 11 may be placed on the planar drainage material 1 at the same time when the planar drainage material 1 is fixed to the construction surface with an anchor or the like, or may be placed on the planar drainage material 1 in advance.

By the way, in the planar drainage material of the present invention, depending on the number of mountain folds 6 and valley folds 7 and how the width dimensions of the wide wall portion 8 and the narrow wall portion 9 are determined, the shape shown in FIG. It is also possible to make the vertical width when contracted shown as about 1/5 of the vertical width L when expanded. Therefore,
If the vertical width when contracted is about 1m, it can be used as a backfill drainage material for tunnels and grounds.
When used, the vertical width can be extended to 5 m. In addition, the convenient size range for handling the planar drainage material 1 is 15 to 30 cm in width and 5 to 15 cm in bulk.
However, it is not necessarily limited to this range.

In this embodiment, both the wide wall portions 8 and the narrow wall portions 9 are made to have elasticity, but it is also possible to provide elasticity to either one of these wall portions. . Further, the water holes 10 do not necessarily need to be scattered over the entire range of the four walls 2, 3, 4, and 5 of the hollow body, and may be scattered only on some of the walls.

[Effect of idea]

As explained above, the planar drainage material of the present invention is
It can be expanded, contracted and deformed freely, and maintains its appearance after expansion, contraction and deformation. Therefore, it becomes possible to contract during transportation, expand during construction, or deform into a shape that follows the construction surface, reducing transportation costs and improving workability during construction.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view of a planar drainage material according to an embodiment of the present invention, Fig. 2 is a partial sectional view showing the main parts of the planar drainage material when it is contracted, and Fig. 3 is a schematic perspective view of the planar drainage material according to an embodiment of the present invention. Fig. 4 is an explanatory diagram comparing the vertical width of the planar drainage material when it is contracted and extended, and Figs. 5a and 5b are the planar sections. A schematic side view showing a bent state of the drainage material, Fig. 6 is a partially cutaway perspective view showing the case where the planar drainage material is covered with a filter material, and Fig. 7 shows the planar drainage material being used as backfill drainage material for a tunnel. FIG. 2 is a schematic cutaway perspective view when used as 1... Planar drainage material, 2, 3, 4, 5... Wall of hollow body, 6... Mountain fold, 7... Valley fold, 8, 9
...Wall part, 10...Water hole.

Claims (1)

[Scope of utility model registration request] In each of the four walls of the hollow body having a rectangular cross section, mountain folds and valley folds are formed alternately at a plurality of locations separated by a predetermined interval, and the mountain folds of each wall are formed with each other, and the valley folds of each wall are formed with each other. is continuous through the corner portion of the hollow body, and at least one wall portion of the sloped wall portions on both sides sandwiching the mountain fold portion or the valley fold portion is provided with elasticity, and this elasticity is provided. When the valley fold part is pushed into the mountain fold part, the provided wall part pinches the mountain fold part and overlaps with another wall part adjacent to this wall part, and the valley fold part is pulled out from the mountain fold part. Sometimes the wall portion having elasticity and the other wall portion are configured to form a chevron-shaped cross-sectional shape with the mountain fold portion as the top,
Furthermore, a planar drainage material characterized in that water holes are formed in some or all of the four walls.