JPS6038767Y2 - water drain pipe - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a drainage pipe installed in, for example, a concrete retaining wall, etc., and it is possible to obtain a good drainage effect, and to manufacture it easily and inexpensively. Its purpose is to make things possible.

Retaining walls are generally formed on the slopes of embankments and cuts on roads, railways, or in developed areas using concrete, piles of stones, blocks, etc., for the purpose of stabilizing and protecting the slopes. It is carried out according to

However, when moisture is impregnated into the earth and sand on the back side of the retaining wall due to rain or the like, the earth and sand expands, and the expansion pressure causes the retaining wall to be pushed out from the rear side and destroyed.

Therefore, in order to prevent the retaining wall from being destroyed by the expansion pressure of the earth and sand, it is necessary to install a drainage pipe on the retaining wall to drain rainwater etc. impregnated with the earth and sand to the front side of the retaining wall. Become.

For example, this drainage pipe may be simply formed into a cylindrical shape with openings at both ends, or the rear end of the cylindrical body, that is, the end located on the earth and sand side, may be shielded and numerous small holes may be formed on the circumference. Various types of drainage pipes are used, such as those with a hole in the pipe or those with a fiber layer filter on the rear end of the cylinder. This has the disadvantage that soil particles flow out along with rainwater, etc., and if the rear end of the cylinder is constructed to be shielded, the method of shielding is to separate the lid or to Since it is formed in one piece, it has the drawback that the manufacturing process is complicated and the manufacturing cost is high.Also, if the filter is installed at the rear end of the cylinder, it is expensive and prevents clogging. It has disadvantages such as being easy to wake up.

On the other hand, especially when forming a retaining wall with concrete, the first half of the drain pipe is buried in the concrete at the same time as the concrete pouring process, but at this time the concrete may flow into the drain pipe and block it. In the first half of the drain pipe, which is embedded in the concrete so as not to cause water leakage, a shielding part is provided which has approximately the same width as the wall thickness of the concrete retaining wall and does not have water permeability holes such as small holes drilled therein.

However, since the wall thickness of concrete retaining walls varies depending on the construction situation, a drainage pipe that is pre-formed with a shielding part of a certain width cannot be used universally for concrete retaining walls of various wall thicknesses. The reality is that this is not possible.

The present invention is an attempt to improve the above-mentioned situation, and it provides a good drainage effect, is simple and inexpensive to manufacture, and has various shielding widths for the front half of the drainage pipe. Its feature is that it can be formed to match the thickness of the retaining wall.

That is, the present invention has a cylindrical body having an arbitrary length dimension and having a large number of small holes formed in the upper part of the peripheral wall and on both left and right sides,
The gist is that the rear end of the cylindrical body is crushed and closed, while the front half of the cylindrical body is covered with a tube through heat shrinkage.

Hereinafter, specific embodiments of the present invention will be described with reference to the illustrative drawings.

FIG. 1 is a schematic diagram of the usage state of the drain pipe 1 according to the present invention, in which A indicates a concrete retaining wall and B indicates earth and sand, respectively.

FIG. 2 is an exploded perspective view of the drain pipe 1, FIG. 3 is a vertical cross-sectional view thereof, and FIG. 4 is a cross-sectional view thereof.

In the drawing, reference numeral 2 denotes a cylindrical body constituting the drain pipe 1, and the cylindrical body 2 is made of synthetic resin such as polyethylene.

A large number of small holes 3 are bored in the peripheral wall of the cylindrical body 2 over its upper part and both left and right sides.

The cylindrical body 2 has many small holes 3 in the surrounding wall soil part and both left and right sides.
It is obtained by cutting a pipe material having a long length into a shape and then cutting it into an arbitrary length.

The rear end portion 2' of the cylindrical body 2 is heated and softened, and then pressed from above and below to crush it and close it. If necessary, the closed state can be closed by, for example, stapling or ultrasonic welding. Force them to fix it.

4 is a tube, and the tube 4 is made of heat-shrinkable synthetic resin such as vinyl chloride, and is attached to the cylindrical body 2.
It is formed into a cylindrical shape with an inner diameter that allows it to be fitted externally, and its length can be set to any desired size, specifically approximately the same as the wall thickness of the retaining wall A to be used. Force it to form.

The tube 4 is fitted onto the front half of the cylindrical body 2 and heated to an appropriate temperature, thereby fixing the tube 4 to the cylindrical body 2 through the heat shrinkage effect.

Next, its usage and effect will be explained.

As shown in FIG. 1, the drain pipe 1 according to the present invention is used by being embedded in a concrete retaining wall A and earth and sand B with the front end being appropriately inclined so that the front end is at a lower level.

At this time, the first half of the cylindrical body 2 to which the covering tube 4 is fixed is made to face the concrete retaining wall A, and the second half of the cylindrical body 2 has a large number of small holes 3 and 3 formed in its peripheral wall.
... is located within the earth and sand B.

By installing the drain pipe 1 in this way, a large number of small holes 3 are drilled in the surrounding wall soil part and both left and right sides of the cylinder body 2.
It is possible to collect rainwater, etc. impregnated in the earth and sand B into the cylinder body 2 through the water permeation effect of . This provides the effect of draining water from its front end.

In addition, the covering tube 4 fixed to the front half of the cylinder body 2 has the effect of shielding the small holes 3 bored in the front half, and as a result, the small holes 3...・・・・・・
The effect of preventing concrete from flowing into the cylinder 2 can be obtained.

The present invention has the above-mentioned configuration, and as described above, the cylinder body 2 is formed with a large number of small holes 3 bored in the upper part of the peripheral wall and on both left and right sides. The rear end 2' of the cylinder body 2 is closed in a crushed manner, while the tube 4 is covered in the front half of the cylinder body 2 through its heat shrinkage in a manner corresponding to the thickness of the retaining wall to be embedded. As a result, not only can a good drainage effect be obtained through the large number of small holes 3 without causing clogging, but also a drainage pipe that is easy to manufacture and inexpensive. I was able to obtain the following.

That is, as in the past, for example, the rear end of the cylindrical body is shielded by a lid body, several small holes are bored in the circumferential wall of the cylindrical body, and a shielding part is integrally provided in the front half of the cylindrical body. However, in the present invention, there are many small holes on the upper part of the peripheral wall and on both the left and right sides. Hole 3・
The cylindrical body 2 is shaped by cutting a long pipe material with perforations to a desired length, and the rear end of the cylindrical body 2 is crushed and closed. It has now become possible to manufacture the drain pipe 4 using an extremely simple method of simply covering the tube 4 in the first half through heat shrinkage.

In addition, as mentioned above, in the case where a conventional drain pipe has a predetermined width in the front half and a shielding part is integrally formed, there is a problem with retaining walls formed with various wall thicknesses. However, it had the disadvantage that it could not be used for general purposes.
In the present invention, as described above, by covering the front half of the cylinder body 2 with the tube 4 through heat shrinkage, the width of the tube 4 can be arbitrarily set, thereby forming a drainage pipe. 1 can now be used universally for retaining walls of various wall thicknesses.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the usage state of the drain pipe according to the present invention.
FIG. 2 is an exploded perspective view of the drain pipe, FIG. 3 is a vertical cross-sectional view thereof, and FIG. 4 is a cross-sectional view thereof. 1...Drain pipe, 2...Cylinder, 2'...Rear end, 3...Small hole, 4... tube.

Claims (1)

[Scope of utility model registration request] A cylindrical body with a large number of small holes formed in the upper part and both left and right sides of the peripheral wall is formed to have an arbitrary length, and the rear end of the cylindrical body is closed in a crushed manner. A drainage pipe made by covering the front half of the body with a tube that has been heat-shrinked.