JPH0629206Y2 - Water-permeable mat synthetic resin core material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a synthetic resin core material used for a water-permeable mat for guiding underground water to a gutter or the like for draining.

[Conventional technology]

A permeable mat used as a backfill drainage material for tunnels, grounds, slopes, etc. forms a water passage inside the ground and guides the water in the surrounding ground collected in the water passage to the gutter etc. and drains it. Therefore, various types having a synthetic resin core material have been proposed.

For example, the core material of the water-permeable mat disclosed in Japanese Utility Model Publication No. Sho 62-20499 is made of a synthetic resin sheet, and a large number of ridges and valleys are formed by molding the sheet into an uneven shape. In order to be able to use the interstitial spaces formed between the mountain-shaped portions and between the valley-shaped portions as well as a large number of through holes formed in the mountain-shaped portions and the valley-shaped portions as water passages. I am doing it.

In addition, instead of the above sheet, there is also one in which a net made of synthetic resin is formed in an uneven shape.

[Problems to be solved by the invention]

However, when a mountain-shaped portion and a valley-shaped portion are formed by molding a sheet into an uneven shape like the core material disclosed in the above publication, the sheet is stretched at the molding points of those respective portions, particularly at the center of each of those portions. The thickness of the resin layer forming the ridges and valleys becomes weaker, and it acts in the thickness direction of the core material (height direction of the ridges or depth direction of the valleys). There is an inconvenience that the shape of the water passage is deformed or crushed by a load such as earth pressure so that the width of the water passage becomes uneven in each part, and a sufficiently wide water passage cannot be secured, resulting in impaired drainage performance. Further, since the stretched synthetic resin is liable to undergo heat shrinkage, the core material disclosed in the above publication also has a problem that it is heat shrunk or deformed for some reason.

A core material formed by molding a synthetic resin net in an uneven shape makes it difficult to position the intersections of the warp and weft of the above net at the top of the chevron and the bottom of the trough, due to molding technology problems. In most cases, only the warp threads or the weft threads of the net pass through the top or bottom, and the intersections of the warp threads and the weft threads are not located. Therefore, the earth pressure resistance strength of the top and bottom is extremely insufficient, and the above-mentioned inconvenience occurs more remarkably.

The present invention has been made in view of the above problems. It is hard to be deformed or crushed by a load such as earth pressure acting in a thickness direction or an oblique direction, and the ribs are sufficiently wide. It is an object of the present invention to provide an inexpensive synthetic resin core material in which a space is secured and which can be easily injection-molded by a split mold.

[Means for solving problems]

In order to achieve the above-mentioned object, the synthetic resin core material of the water-permeable mat of the present invention is such that the tops of the ridges and the bottoms of the valleys are alternately arranged in a grid pattern, and the tops of the ridges and the surroundings of the ridges are arranged. The bottoms of the valley-shaped portions adjacent to each other and the bottoms of the valley-shaped portions and the tops of the adjacent mountain-shaped portions around the valley-shaped portions are integrally connected by a plurality of vertical ribs spaced apart from each other. Together, the crests of the adjacent mountain-shaped portions, and the crests of the adjacent valley-shaped portions are connected to each other by respective horizontal ribs extending in mutually orthogonal directions, and further, the horizontal ribs and the valleys that connect the crests of the mountain-shaped portions. It is characterized in that the horizontal ribs connecting the tops of the shaped portions are connected to each other by the vertical ribs orthogonal to them.

[Action]

The load in the thickness direction and the diagonal direction acting on the core material having the above configuration is mainly supported by the vertical ribs and the vertical ribs. In particular,
Since the tops of the ridges or the bottoms of the valleys are connected by horizontal ribs, the mutual spacing between the tops of the ridges and the mutual spacing between the bottoms of the valleys are kept constant. Very strong strength is exerted against a load acting in the direction.

Further, in the core material having the above configuration, the horizontal ribs connecting the tops of the mountain portions and the horizontal ribs connecting the bottoms of the valley portions extend in a direction orthogonal to each other, and the horizontal ribs are connected by the vertical ribs. Therefore, it can be easily molded by using a two-divided mold, and by doing so, a three-dimensional structure having no stretched portion is formed, and there is no fear of deformation due to heat shrinkage or the like.

〔Example〕

1 is a partial plan view of a core material 1 according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a schematic perspective view of an essential part. As shown in these drawings, in the core material 1, a large number of peak-shaped portions a and valley-shaped bottom portions b are alternately arranged in a rectangular lattice pattern in plan view, and the peak portions a and The bottoms b of the four valley-shaped portions adjacent to each other around the mountain-shaped portion are integrally connected by four vertical ribs 2, ... In the core material 1 of the illustrated example,
The top part a and the bottom part b are formed in a flat plate shape having a substantially rectangular shape in plan view, but the top part a and the bottom part b may be partially spherical. Also, the vertical ribs 2 are common to the vertical ribs that integrally connect the bottom portion b of the valley portion and the top portions a of the plurality of mountain-shaped portions adjacent to each other around the valley portion, and the top portion a and the bottom portion b are common. Then, the adjacent vertical ribs 2 and 2 are orthogonal to each other. The vertical ribs 2 ... In the illustrated example are slightly inclined at the portion between the top portion a and the bottom portion b, but the vertical ribs 2 ...
May be vertical. In that case, the corner portions of the top portion a and the bottom portion b are wrapped in the thickness direction of the core material 1. Moreover, the longitudinal ribs 2 are formed by injection-molding a synthetic resin, for example, a thermoplastic resin such as polyvinyl chloride resin or polypropylene resin, into the above-mentioned shape, and the warp or weft of a synthetic resin net is drawn. It is not formed by doing. In the above description, the chevron portion means a portion that is raised in a chevron shape around the top portion a, and the trough portion is a portion that is recessed in a trough shape around the bottom portion.

Further, each of the top portion a and the four top portions a ... Surrounding the top portion a are connected by lateral ribs 3. Further, each of the bottom part b and the four bottom parts b ...
Are linked by. The upper and lower horizontal ribs 3 and 4 corresponding to each other in the thickness direction of the core material 1 extend in mutually orthogonal directions, and the central portions thereof are connected by the vertical ribs 5.

Each of the vertical ribs 2, ..., The horizontal ribs 3, ..., 4 described above is formed in an elongated strip plate shape having a rectangular cross section having a width dimension larger than its thickness dimension.

Such a core material 1 is easily molded in the shape of a three-dimensional structure by closing a two-piece mold, press-fitting a synthetic resin, and then opening the mold and releasing the mold. Therefore, the core material of the present invention can be manufactured by one-time molding, and it is necessary to mold the sheet or net once with the synthetic resin as in the conventional method and then mold them into the uneven shape twice. In comparison, the molding process is simplified and the cost is low.

In the core material 1, the tops a of the mountain-shaped portions and the bottoms b of the valley-shaped portions are alternately arranged in a grid pattern, and the tops a and the bottoms b are connected by a plurality of vertical ribs 2.
Four vertical ribs 2 ... And four horizontal ribs 3 intersect at the top portion a, and four vertical ribs 2 ... And four horizontal ribs 4 intersect at the bottom portion b. The horizontal ribs 3 and 4 are connected by the vertical ribs 5, and the adjacent tops a and a and the adjacent bottoms b and b extend in the directions orthogonal to each other. The fact that they are respectively connected by ... Synergize. In particular, the distance between adjacent tops a, a and bottoms b, b is such that the lateral ribs 3,
Since it is kept constant by 4, the core material 1 is less likely to be deformed or crushed by a load such as earth pressure acting on the core material 1, and the core material 1 is a three-dimensional structure, A wide space between the vertical ribs 2, the horizontal ribs 3, 4, and the vertical ribs 5 serves as a water passage, so that a high drainage capacity is provided for a long period of time.

In order to utilize the core material 1 as a core material of a water-permeable mat, as shown in FIG. 4, the core material 1 is covered with an outer cover 6 made of a water-permeable woven fabric, non-woven fabric, knitted fabric, papermaking, etc. Make sure that the mud does not penetrate into the space of the core 1 when it is buried in.

[Effect of device]

In the core material of the present invention, the tops of the ridges and the bottoms of the valleys are alternately arranged in a regular grid pattern, and the intersections of the vertical ribs are located at the tops of the ridges and the bottoms of the valleys. , The vertical ribs form the top of the chevron and the bottom of the valleys adjacent to the chevron as well as the bottom of the trough and the peaks of the chevrons adjacent to the valley. Be connected, the tops of adjacent mountain-shaped parts and the tops of adjacent valley-shaped parts are connected by respective horizontal ribs extending in mutually orthogonal directions, and the tops of the mountain-shaped parts are connected. The horizontal ribs and the horizontal ribs that connect the tops of the troughs are connected by the vertical ribs, etc., which act synergistically and make the entire core material more uniform and stronger than the conventional one. Have,
It is difficult for the peaks and valleys to be deformed or crushed by the load acting in the thickness direction and the diagonal direction. In addition, it is molded in the shape of a three-dimensional structure by injection molding using a general-purpose split mold, and if so, each of the vertical ribs, the horizontal ribs, and the vertical ribs is not stretched, and therefore each of them is not stretched. The rib does not deform due to accumulation of solar heat or the like during storage, and serves as a core material for a water-permeable mat that does not deteriorate drainage performance for a long period of time.

[Brief description of drawings]

FIG. 1 is a partial plan view of a core member according to an embodiment of the present invention, and FIG.
The drawing is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a schematic perspective view of a main part, and FIG. 4 is a schematic perspective view showing a usage example when a core material is used for a water-permeable mat. 1 ... Core material, 2 ... Vertical ribs, 3, 4 ... Horizontal ribs, 5 ... Vertical ribs, a ... Top of mountain portion, b ... Bottom of valley portion.

Claims (1)

[Scope of utility model registration request] 1. The tops of the chevron portions and the bottoms of the troughs are alternately arranged in a grid pattern, and the crests of the chevron portions and the bottoms of a plurality of troughs adjacent to each other around the chevron portions, and the troughs. The bottom and the tops of a plurality of adjacent mountain-shaped portions around the valley-shaped portions are integrally connected by a plurality of vertical ribs spaced apart from each other, and the tops of the adjacent mountain-shaped portions are adjacent to each other. The tops of the valley portions are connected to each other by respective horizontal ribs that extend in mutually orthogonal directions, and the horizontal ribs that connect the tops of the mountain portions and the horizontal ribs that connect the tops of the valley portions are orthogonal to them. A synthetic resin core material for a water-permeable mat, which is connected by vertical ribs.