JPH0247349Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The invention is an underground drainage pipe, generally called a culvert drainage pipe, which can be installed underground in developed areas, farmland, retaining walls, embankments, etc. A pipe that is buried underground and used to collect rainwater and spring water from underground and guide it to the required drainage channel.

<Prior Art> Various types of underground drain pipes of this type have been devised, and several types have actually been commercialized. A typical example is one in which a tube is formed and then small holes are bored in the peripheral wall of the tube. As shown in FIG. 12, the known structure that is considered to be closest to the present invention is a drainage pipe devised by the present applicant, in which short fibers are entangled to form countless micropores 021. There is a structure that utilizes nonwoven fabric 02. The drain pipe shown in FIG. 12 is made by winding a nonwoven fabric strip 02 cut into a long strip in a spiral shape at predetermined intervals.
A separately formed thick band 01 made of hard synthetic resin is placed on the left and right side edge portions 022, 023 of 2 and connected between these side edge portions 022, 023, and is wound spirally. , has a structure in which left and right side edge portions 011, 012 of the band 01 and both side edge portions 023, 022 of the nonwoven fabric band 02 are fused.

<Problems to be solved by the invention> However, the former type of drainage pipe with holes drilled around the pipe wall requires a great deal of effort in drilling the holes, and is therefore not suitable for mass production. The latter type of nonwoven fabric is relatively easy to manufacture, does not require drilling, and has the remarkable feature of producing a homogeneous product; however, due to its structure, it acts in the direction of peeling off the nonwoven fabric band 02 from the band 01, especially when the diameter of the tube is
When it comes to large diameter pipes such as 500mm or 1000mm, when earth pressure, soil pressure, etc. act locally and intensively on the nonwoven fabric band 02, a peeling phenomenon occurs between the fibers of the nonwoven fabric band 02, which is a collection of short fibers, and the nonwoven fabric It has been found that there is a problem with the strength of the belt itself, and that there is a risk that the fused portion may peel off unless the two bands 01 and 02 are fused extremely reliably.

<Means for solving the problems> Therefore, the present inventor has achieved the present invention as a drainage pipe that can solve all of these concerns. A long strip-shaped strength member whose cross section is formed by protruding upward and serving as a reinforcing strip with left and right edges protruding laterally outward from each other is spirally arranged at a predetermined interval so as not to touch each other. A strip material having countless fine pores communicating in the thickness direction is arranged in a bridge shape on the left and right side edges of the strength member wound in this way. The problem was solved by fixing them together. This specific structure includes a long strip-shaped strength member whose central portion projects upward and whose left and right side edges project laterally outward from each other. The main body of the tube is formed by spirally winding each other at a required interval without contacting or overlapping with the tube.
A strip material having numerous fine pores communicating in the thickness direction is disposed on the outer surface of these adjacent side edges to create a structure in which the overlapping portions of these two members are fixed. .

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

The embodiment shown in FIGS. 1 to 3 has a cross-sectional shape in which the central portion is U-shaped and protrudes upward 11, and the left and right side edges 12 and 13 protrude laterally outward from each other. The long belt-shaped strength member 1 made of a hard synthetic resin material and the left and right side edges 12, 13 are prevented from coming into contact with the adjacent side edges 13, 12.
It is wound spirally at a predetermined interval l to form the main part of the tube wall, and these adjacent side edges 1
Cross-linked non-woven fabric strip 2 on the outer surface of 3 and 12
are arranged, and the left and right side edge portions 22 of these strips 2,
23 and the both side edges 13 and 12 of the strength member 1 are fused together at their overlapping parts.

It goes without saying that the fixation of these two members 1 and 2 is not limited to only fusion bonding, but may also be fixed using an adhesive. In addition, non-woven fabrics using fibers made of vinylidene chloride, for example, are preferable because they are hard and do not deteriorate even when placed in the soil, and can be used for many years. It is not something that will be done. For example, it may be made of natural fibers coated with a resin film or a mixed fiber of natural fibers and synthetic resin fibers.

The embodiment shown in FIGS. 4 and 5 has the same structure as the embodiment described above, except that the strip material 2 made of a low-expansion open-cell sheet material is used in place of the strip material 2 made of nonwoven fabric in the embodiment described above. This figure shows an example of a drainage pipe for underground burial.

In the present invention, the band material 2 may be made of a material other than non-woven fabric as long as it has numerous fine pores 21 communicating in the thickness direction. However, it goes without saying that for practical use, materials with excellent durability, corrosion resistance, etc. should be selected.

In the embodiment shown in FIG. 6, a non-porous synthetic resin material is separately formed on the inner surface of the tube of the right and left side edges 12, 13 of the strength member 1 in the structure of the embodiment shown in FIGS. 1 to 3. The flat strip material 3 is arranged to close the space a formed by the central protrusion 11,
It has a structure in which it is fused to both side edges 12 and 13 of the strength member 1. With this structure, the water collected through the numerous pores 21 inside the pipe can be guided to the drainage channel side with less stagnation. In the embodiment shown in FIG. 7, the cross-sectional shape of the upwardly protruding portion 11 of the strength member 1 is formed into a chevron wave shape, and both side edge portions of the nonwoven fabric strip 2
2 and 23 are the side edges 13 of the strength member 1,
12, both side edges 13, 12
This shows a structure in which the center portion 24 having a width approximately corresponding to the spacing 1 is left and is melted and fused by heating. In this case, the peeling phenomenon between each fiber of the nonwoven fabric strip 2 can be greatly reduced, and the strip material 2
The pressure resistance against local earth pressure can be greatly strengthened, and it is possible to obtain a good drainage pipe for underground burial with very little deterioration or damage even after long-term use.

The embodiment shown in FIG. 8 shows the structure of a non-woven fabric strip 2, in which a central portion of the strength member 1 has a width l that is approximately the same as the width of the spacing l between the side edges 13 and 12. Leaving 24, the left and right side edge portions 22,
This shows a belt material obtained by melt-processing No. 23. In addition, in the embodiment shown in FIG. 9, in the nonwoven fabric strip material 2, the central portion 24 is left with a predetermined width l, and the left and right side edge portions 22, 23 are impregnated with a resin material or allowed to flow therein. This figure shows a band material having a structure that has been made non-porous by filling the fine voids between nonwoven fabric fibers with resin and integrating them.

In this way, before winding the band material 2 itself onto the strength member 1, if the left and right side edge portions are hardened or integrated, leaving the center portion,
As in the case of the embodiment shown in FIG. 7, the fixation of the strength member 1 onto the side edges 13, 12 can be made more reliable than in the case of untreated nonwoven fabric. In addition, the peeling phenomenon between fibers and pressure deformation resistance in the untreated portion of the central portion 24 can be greatly improved, and a drain pipe for underground burial that is more durable can be obtained. be able to.

The treatment of both side edge portions of the band material 2 and the band material 2 fixed by the fusion means as shown in the embodiment shown in FIG. It goes without saying that the same procedure may be applied to the strip material 2 made of open-cell foam material as shown.

The embodiment shown in Figs. 10 and 11 shows an embodiment in which a separately formed band body is used in addition to the band material 2 referred to in the present invention. After the nonwoven fabric strip 2 is fused onto the outer surface of the side edges 13, 12 of the member 1, a large number of small holes 51, 51... are formed on the outer surface of the strip 2.
shows a structure in which a separately formed synthetic resin band 5, which is formed through the thickness direction, is polymerized and fixed,
In the embodiment shown in FIG. 11, the side edges 13 of the strength member 1,
First, a separately formed synthetic resin band 4 is placed on top of 12.
It has a structure in which a nonwoven fabric strip material 2 is polymerized and fused on the outer surface of the nonwoven fabric. Although this band body 4 is shown as having a structure in which the through holes 41 are formed in a single row in the central portion in the width direction, they may be formed in two or more rows, and the embodiment shown in FIG. It may be formed over substantially the entire width like the band 5 shown in FIG. Also, the 10th
The same applies to the structure of the band 5 shown in the figure, and the number of holes, hole rows, etc. may be formed arbitrarily.

The synthetic resin materials used for the strength members of the present invention are preferably olefin synthetic resins such as polyethylene and polypropylene, and vinyl chloride synthetic resins, but are not limited to only synthetic resin materials, such as hard rubber, rubber and synthetic resins. It may also be a mixture of In addition, it is advantageous to use a material similar to that of the strength member for the band material because it has good fusion properties and can securely fix the two, but it is already known that other materials may be used. As stated above.

<Effects of the Invention> As already clear from the above description of the embodiments, the present invention uses a strength guaranteeing member constituting the main body of the pipe of the strength member, and a strength member on the outer surface of the laterally protruding both side edges of the strength member. , has a structure in which a band material such as a non-woven fabric with countless fine communication holes is supported in the thickness direction, and when it receives external pressure such as earth pressure, it uses that external pressure to spread on the laterally protruding both side edges of the strength member. It is converted into a force that presses the strip material, and is used to prevent and protect the longitudinal edges of the strip material itself, which are the most easily damaged parts, from being damaged. Since the structure is such that the external pressure can be received and supported by the above-mentioned both side edges of the strength member, it is extremely easy to use, even though it uses strip materials such as non-woven fabrics, which are already known in this type of underground drainage pipe. It is possible to obtain a drainage pipe with excellent pressure resistance, less damage to the strip material, and no peeling from the strength member, and at the same time, a material with numerous fine communication holes such as non-woven fabric is used as the strip material. As a result, there was no need to perform drilling work such as small holes in order to obtain the strip material, and it became possible to obtain underground drainage pipes that were less likely to become clogged and had excellent water collection properties. .

[Brief explanation of the drawing]

Figures 1 to 3 are views showing one embodiment of the present invention, in which Figure 1 is a partially cutaway overall front view, Figure 2 is a sectional view showing the main parts, and Figure 3 is a perspective view of the band material. , FIGS. 4 and 5 are sectional views of the main parts and perspective views of the band material showing another embodiment, FIGS. 6 and 7 are sectional views of the main parts showing another embodiment, respectively, and FIG. 9 and 9 are respectively perspective views showing another embodiment of the band material, FIGS. 10 and 11 are sectional views of main parts showing further embodiments, and FIG. 12 is a main part showing a conventional product. FIG. In the figure, 1 is a strength member, 2 is a band material, 11 is a protrusion, 12, 13 are side edges, 21 is a pore, 22, 2
3 indicates the side edge portion, and l indicates the interval.

Claims (1)

[Scope of claim for utility model registration] The center part protrudes upward 11, the left and right side edges 12,
A long strip-shaped strength member 1 having a cross-sectional shape in which 13 protrudes laterally outward from each other is attached to both side edges 13, 12 where the left and right side edges 12, 13 are adjacent to each other.
and a strip wound spirally at a required distance l from each other, and having numerous fine pores 21 communicating in the thickness direction on the outer surfaces of these adjacent side edges 13 and 12. A drain pipe for underground burial, in which a member 2 is arranged in a bridge-like manner, and left and right side edge portions 22 and 23 of the member 2 are fixed on adjacent side edge portions 13 and 12 of the strength member 1. The drain pipe for underground burial according to claim 1, wherein both the strength member 1 and the band material 2 are made of synthetic resin material. The drain pipe for underground burial according to claim 1, wherein the band material 2 is a nonwoven fabric. The drain pipe for underground burial according to claim 1 or 2, wherein the band material 2 is a nonwoven fabric made of vinylidene chloride. The drain pipe for underground burial according to claim 1, wherein the band material 2 is a sheet material made of low-expansion open cell material. The underground drain pipe according to claim 1, wherein the upwardly projecting portion 11 of the strength member 1 has a U-shaped cross section. The drain pipe for underground burial according to claim 1, wherein the cross-sectional shape of the upwardly projecting portion 11 of the strength member 1 is a chevron waveform. The drainage pipe for underground burial according to claim 1, wherein the strength member 1 and the strip material 2 are bonded by fusion. The drain pipe for underground burial according to claim 1, wherein the portion of the strip material 2 fixed to the strength member 1 is heated and melted.