JPH0472004B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a water collection section and a drainage section by housing a gutter-like body with an upward opening in a pipe body provided with an inflow opening for water inflow. The basic idea is to separate the
This invention relates to an underdrain collection and drainage pipe that can efficiently collect and drain ground water for many years and is easy to manufacture.

(Prior art and problems to be solved by the invention) When implementing blind drainage works in the ground, it is important to pay attention to how to separate soil particles and collect only water efficiently. This is the most important thing.

By the way, conventional blind drainage construction methods for the ground include a method in which the ground is replaced with millet stones or gravel to form a drainage space between the millet stones, or a construction method made of synthetic resin with a water collection port as a collection of independent holes. There is a construction method that involves burying perforated pipes made of concrete or similar underground to perform blind drainage of the ground.

However, with the former construction method, there was a problem that the millet spaces etc. were clogged quickly and it was difficult to ensure the sustainability of the collection and drainage. On the other hand, in the latter method, since the pipe itself needs to function both as a water collection pipe and as a drainage pipe, the hole is drilled at the bottom of the pipe, as shown in Figure 17. Upper part b excluding part a of about 1/4 height
I have no choice but to do so. Therefore, there is a restriction on the number of through holes that can be drilled, making it difficult to collect water well. Also, since the water level inside the pipe is limited to a low level of about 1/4 of the bottom of the pipe (compare the water levels shown in Figures 3 and 17)
Drainage efficiency was also not good. The main object of the present invention is to provide an underdrain collection and drainage pipe with a novel configuration that can solve these problems.

(Means for Solving the Problems) The underdrain collection and drainage pipe 1 according to the present invention has an upper opening extending in the axial direction of the pipe body 2, which is provided with an inflow opening 5 for water inflow. A gutter-like body 3 is stored, and between the outer surface 23 of the gutter-like body 3 and the inner surface 20 of the tube body 2, a groove is provided in the outer surface 23 of the gutter-like body 3 in the axial direction. Due to the protruding portion 21,
Alternatively, the protrusion 21 provided in the axial direction on the inner surface 20 of the tube body 2 may form a gap g serving as a waterway, and if necessary, the protrusion 21 may be formed in the protrusion 21 portion. It is characterized by providing a water passage part 35 that communicates between the gaps partitioned by.

(Function) If the underdrain collection and drainage pipes 1 according to the present invention are arranged in the excavated trench 25 at a required drainage slope and buried in the soil in a state in which they are sequentially connected, ground water will flow through the pipes. Water flows into the gap g from the inflow opening 5 of the body 2, moves appropriately within the gap g in the circumferential direction F1 and the axial direction F2, and when the amount of inflow water exceeds a certain amount, the upper edge of the gutter-like body 3 It overflows from the portion 6 into the trough-like body 3 and is discharged at its end by flowing smoothly within the trough-like body 3.

Here, to explain the filter action in the underdrain collection and drainage pipe 1, particles such as soil particles contained in ground water are primarily separated and captured at the inflow opening 5 of the pipe body 2, and The microparticles flowing in from 5 settle in the gap g and are secondarily removed, and in this way, the underdrain drain pipe 1 performs a double filter function.

(Example) Examples of the present invention will be described below based on the drawings.

First Embodiment In Figs. 1 to 4, an underdrain collection and drainage pipe 1 of the present invention is shown.
is a structure in which a gutter-like body 3 is housed in a pipe body 2,
The entire pipe is made of synthetic resin and has a unit length (see Fig. 1; Fig. 1 only shows a portion of the underdrain collection/drainage pipe).

The pipe body 2 has, for example, a circular pipe shape, and on both sides of its outer circumferential surface, linear water inflow openings 5, 5 extending in the circumferential direction are provided at required intervals.
are provided facing each other (see FIGS. 1 and 2).

The gutter-like body 3 has, for example, a shape in which about the upper quarter of a cylindrical tube is cut off, and has a gutter-like shape with an upward opening extending in the axial direction of the tube body 2 .

In this embodiment, the opposing upper edges 6, 6 of the gutter-like body 3 are connected at required intervals by connecting members 7 having an arch shape with a downward opening, and the connecting portions 9 are The extensible portion 10 is capable of expanding and contracting in the vertical direction within a certain range. In a state where the opposing upper edges 6, 6 of the trough-like bodies 3, 3 are connected by the connecting member 7, the trough-like body 3 and the connecting member 7 form a cylindrical part 11. The extensible part 10 is
As shown in Figs. 3 and 4, a groove portion 12 forming the edge of the gutter-like body 3 and having a U-shape with an open upper part.
and forming the lower edge of the connecting member 7 and the groove portion 12
It consists of an insertion part 13 that is loosely inserted into the inside. On both sides of the distal end of the insertion portion 13, locking protrusions 1 are provided which are expanded inwardly at the distal ends of protrusions 15, 15 forming the groove portion 12.
Locking protrusions 17, 17 that can be engaged with 6, 16 are provided in a swollen manner. However, when the insertion part 13 is pushed into the groove part 12 against the elastic action of the protrusions 15, 15, the insertion part 13 is prevented from coming off and is loosely inserted into the groove part 12, so that the gutter The connecting portion 9 between the shaped body 3 and the connecting member 7 can expand and contract in the vertical direction within a certain range depending on the groove depth of the groove portion 12. In addition, tips 19, 19,
Projections 21, 21, 21 are provided in the axial direction, and the trough-like body 3 to which the connecting member 7 is attached is connected to the tube body 2.
When the insertion section 13 is inserted into the interior, in its free state, the lower end portion 22 of the insertion section 13 is located in the middle of the groove section 12, as shown in FIGS.
The tips 19, 19, 19 of 1, 21, 21 come into contact with the inner surface 20 of the tube, and due to the contact, there is a gap between the outer surface 23 of the trough-like body 3 and the inner surface 20 of the tube 2. A gap g serving as a waterway is formed. Note that it is expected that the frictional force generated by the abutment between the tip 19 of the protrusion 21 and the inner surface 20 of the tube body will prevent the gutter-like body 3 from rotating within the tube body 2. As shown by the dashed line in the figure, the inner surface of the tube 2
Alternatively, as shown in FIGS. 1 and 5, a rotation prevention piece 24b that can engage with the upper edge 6 of the gutter-like body 3 is press-fitted and fixed into the inflow opening 5, for example. In this case, the rotation of the gutter-like body 3 can be prevented even more reliably.

Next, an example of how to construct a blind drainage structure in the ground using the culvert collection and drainage pipe 1 according to this embodiment will be explained, and the operation of the culvert collection and drainage pipe 1 according to this embodiment will be explained.

That is, as shown in Fig. 6, the underdrain collection and drainage pipe 1
are arranged in the excavated groove 25 at a required water gradient in a state in which they are sequentially connected so that the gutter-like body 3 opens upward. At that time, the outside of the underdrain collection and drainage pipe 1 is wrapped with a net-like filter material (not shown), and the outside is further surrounded by a filter layer 26 made of filter material such as gravel, sand, and rice husk. Then, the underdrain collection and drainage pipe 1, the mesh filter material, and the filter layer 26 are buried in the soil.

In addition, in order to connect the underdrain collection and drainage pipes 1 and 1 to each other, for example, as shown in FIG.
After connecting the tubes 2 and 7, as shown in FIG.
This is done by connecting the two to each other with a connecting tube 29.

Therefore, the ground water flows into the gap g from the inflow opening 5 of the pipe body 2, moves appropriately through the gap g in the circumferential direction F1 (see FIG. 3) and the axial direction F2 (see FIG. 1), When the amount of inflow water exceeds a certain amount, an overflow 30 (see FIG. 3) flows into the gutter-like body 3 from the upper edge 6a (see FIG. 1) between the connecting members 7, 7 in the gutter-like body 3. The water flows smoothly inside the trough-like body 3 and is discharged at its end.

Note that when the culvert collection/drainage pipe 1 is buried in the soil as described above, ground water is filtered by the filter layer 26 made of gravel, cobbles, etc. and the mesh filter material surrounding the culvert collection/drainage pipe 1. Due to the above-mentioned double filtering action of the drain pipe 1, clean water containing few soil particles flows into the gap g from the inlet opening 5.

In this embodiment, the opposing upper edges 6, 6 of the trough-like body 3 are connected at required intervals by the connecting members 7, and the connecting portions 9 are made into elastic parts 10, so that, for example, Even if external pressure acts on the underdrain collection/drainage pipe 1 in the vertical direction, the deformation of the pipe body 2 is allowed within a certain range due to the deformation absorbing action of the extensible portion 10. This also applies when external pressure in the left and right direction acts on the underdrain collection and drainage pipe 1. Then, an external force exceeding a certain limit acts on the underdrain collection and drainage pipe 1, and as shown in FIG.
After the lower end portion 22 of 3 contacts the bottom portion 31 of the groove portion 12, the cylindrical portion 11 with the protruding portion 21 formed by the trough-like body 3 and the connecting member 7
serves as a reinforcing member and prevents further deformation of the outer tube 2. As described above, the underdrain collection and drainage pipe 1 according to the present embodiment has a much higher load-bearing capacity than a conventional perforated pipe that is a single pipe body, and the risk of breakage due to earth pressure is avoided.

In addition, in this embodiment, when constructing the expandable part 10, the opposing edges 6, 6 of the gutter-like body 3 are connected at required intervals by the connecting member 7,
In addition, when constructing the elastic part 10, since the groove part 12 is provided so as to form the edge of the gutter-like body 3, the thick groove part 12 exhibits a rib effect,
Even when the depth of the water inside the trough-like body 3 increases and the pressure applied to the sides of the trough-like body 3 increases, the expanding deformation of the sides of the trough-like body 3 is caused not only by the connecting members but also by the reinforcement. This is also prevented by the thick groove portions 12 that act as ribs, and the spreading deformation can be made as small as possible.

Furthermore, since the extensible part 10 is configured as a combined structure of the gutter-like body 3 and the connecting member 7, the extensible part 10 is It can also function as an absorber that absorbs manufacturing errors.

Second Embodiment Underdrain collection and drainage pipe 1 of the present invention shown in Figures 9 and 10
The gutter-like body 3 to which the connecting member 7 is attached is connected to the pipe body 2.
The outer surface of the gutter-like body 3 and the pipe body 2
In the basic form in which a gap g serving as a waterway is formed by the protrusion 21 between the inner surface of the first
This is similar to that shown in the embodiment, but the insertion part 13 forming the elastic part 10 is provided on the gutter-like body 3 side, and the groove part 12 forming the elastic part 10 is provided on the connecting member 10 side. There are differences in In addition, in order to suppress the expansion deformation of the side portions of the gutter-like body 3 due to water pressure, as shown in FIGS. It is preferable that the reinforcing flange 32 be positioned slightly below the insertion portion 13 and protrude in the axial direction.

In addition, in the underdrain collection/drainage pipe according to this embodiment and the underdrain collection/drainage pipe according to the above embodiments, the form of the connecting member 7 is not necessarily limited to an arch shape.

Third Embodiment FIGS. 11 to 13 show locking protrusions (continuous protrusions in this embodiment) 33, 33 that protrude toward the center of the tube body, and are opposed to each other at an upper portion of the inner surface 20 of the tube body. The tube body 2 extends in the axial direction, and the protrusions 21, 21, 21 whose tips can come into contact with the inner surface 20 of the tube body are connected to the lowermost end portion of the outer surface of the trough-like body and the outer surface of the trough-like body. The opposing upper edge protrusions 21a, 21a are formed by combining the gutter-like bodies 3 provided at the opposing upper edges, and the opposing upper edge projecting parts 21a, 21a are respectively connected to the tube body 2.
It is located slightly below the locking protrusions 33, 33, and can be engaged in a state where it is in contact with the locking protrusions 33, 33 (see FIG. 13).

In the underdrain collection and drainage pipe 1, the ground water that has flowed into the gap g formed by the protrusion 21 flows through the contact area between the tip 19 of the protrusion 21 and the inner surface 20 of the gutter-like body 3. It passes through the water passage part 35 of the gutter-like body 3
overflow inside. Note that, as shown in FIG. 11, there are cases in which the water passage portion 35 is actively provided by providing a cutout portion 36 in the protrusion portion 21.

In addition, in the underdrain collection and drainage pipe 1, even if the pipe body 2 is deformed due to the action of an external force, the engagement in the abutting state between the protrusion 21 and the locking protrusion 33 (13th (see figure), the gutter-like body 3 functions as a reinforcing member,
To prevent the tube body 2 from being deformed beyond a certain level. The locking protrusions 33, 33 also have the function of preventing the gutter-shaped body 3 from rotating. In the underdrain collection and drainage pipe 1 according to this embodiment, the locking protrusion 33 is formed by press-fitting and fixing a protrusion 37, which is separate from the pipe body 2, into the inflow opening 5, as shown in FIG. As shown in FIG. 41 is also formed. Note that the wire rod 40 is
will be fixed to the tube body 2. Furthermore, the first
As shown in FIG. 6, the locking protrusion 33 can also be formed by recessing a portion of the circumferential surface of the tubular body 2 inward.

In addition, the underdrain collection and drainage pipe and the first to
In the underdrain collection and drainage pipe according to the second embodiment, the arrangement of the protrusions 21 is not limited to that shown in the drawings, and the protrusions 21 may be arranged as shown by the dashed line in Fig. 12. There is also. When the protruding portion 21 is provided in this manner, it is preferable to form the water passage portion 35 by providing a notch or a through hole in the protruding portion. Further, as the pipe body 2, for example, a perforated pipe in which inflow openings in the form of circular holes are provided innumerably over the entire circumference can be adopted, and furthermore,
If necessary, a reinforced mesh tube or the like may be used.

(Effects of the Invention) The underdrain collection and drainage pipe of the present invention has a collection of linear inflow openings, a collection of innumerable through holes provided over the entire circumference, or a collection of innumerable meshes. By installing a gutter-like body in a pipe whose total area of openings can be very large, a gap is created that separates the water collection part from the drainage part and serves as an inflow opening and a waterway. As mentioned in the "effects section" above, the water collection part is constructed so that a double filter action is exerted, so that clean water with less particulate matter can flow into the trough-like body. can. Therefore, the above-mentioned conventional perforated pipe, that is, the pipe itself is made to function as a water collection pipe as well as a drainage pipe, and therefore the number of holes that can be bored is limited. Its essence is different from that of a perforated pipe, which is capable of collecting ground water efficiently and permanently, as well as discharging the collected ground water promptly and permanently. I can do it.

In other words, the underdrain collection and drainage pipe of the present invention not only efficiently collects and drains ground water in a short period of time, but also maintains effective collection and drainage for many years.

Since the underdrain collection and drainage pipe of the present invention performs a double filter function as described above, it is possible to save filter materials compared to the case where a blind drainage work in the ground is constructed using a perforated pipe as mentioned at the beginning. At the same time, conditions regarding the quality of filter materials can be relaxed.

As described above, when using the underdrain collection/drainage pipe of the present invention, it is possible to save material costs and construction labor, thereby reducing construction costs and shortening the construction period.

Since the underdrain collection and drainage pipe of the present invention has a simple structure in which a gutter-like body is housed within a pipe body, it can be easily manufactured without requiring any skill, and can be provided at a relatively low cost.

In the underdrain collection and drainage pipe of the present invention, it is advantageous to make the depth of the gutter-like body as deep as possible within a range that does not impair the drainage performance as an open channel. I can respond. In other words, the deeper the depth of the trough, the higher the water level inside the trough can be set, and therefore, there may be some errors in the drainage gradient due to errors in the installation of the underdrain collection pipe, or the underdrain collection may be affected by uneven pressure. Even if the drain pipe partially sinks, the drainage action within the drain pipe can be ensured.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing an embodiment of an underdrain collection/drainage pipe according to the present invention, Fig. 2 is an exploded perspective view thereof, Fig. 3 is a sectional view thereof, and Fig. 4 shows the expandable part. An enlarged cross-sectional view, FIG. 5 is a perspective view showing the state in which the anti-rotation piece is attached to the pipe body, FIG. 6 is a perspective view showing the state in which the underdrain collection and drainage pipe is used, and FIG. FIG. 8 is a cross-sectional view illustrating the action of the expandable part, FIG. 9 is a perspective view showing another embodiment of the underdrain collection and drainage pipe according to the present invention, and FIG. FIG. 9 is a sectional view showing an enlarged extension and contraction part of the underdrain collection and drainage pipe; FIG. 11 is a perspective view showing other embodiments of the underdrain collection and drainage pipe according to the present invention; and FIGS. 12 to 13.
14 is a perspective view showing another example of the locking protrusion, FIGS. 15-16 are sectional views showing other examples of the locking protrusion, and FIG. 17 is a conventional culvert collection. FIG. 3 is a cross-sectional view illustrating a drain pipe. DESCRIPTION OF SYMBOLS 1... Underdrain collection and drainage pipe, 2... Pipe body, 3... Gutter-like body, 5... Inflow opening, 20... Inner surface of pipe body,
21...Protrusion portion, 23...Outer surface portion of gutter-like body, 35
...Water passage, g...Gap.

Claims (1)

[Claims] 1 Pipe body 2 provided with an inflow opening 5 for water inflow
A gutter-like body 3 with an upward opening extending in the axial direction of the tube body 2 is housed inside, and an outer surface 2 of the gutter-like body 3
3 and the inner surface 20 of the tube body 2 by a protrusion 21 provided in the axial direction on the outer surface 23 of the gutter-like body 3, or by a protrusion 21 provided in the axial direction on the inner surface 20 of the tube body 2. The protrusions 21 provided form a gap g that becomes a waterway, and if necessary, the protrusions 21 may be provided with a passage that connects the gaps partitioned by the protrusions 21. An underdrain collection and drainage pipe characterized by having a water section 35.