JP6314048B2 - Drainage pipe - Google Patents

Description

  The present invention relates to a drain pipe.

  Conventionally, for example, a drainage pipe as shown in Patent Document 1 below is known. The drainage pipe includes a pipe body that is buried in the ground, and a liquid passage hole that is provided on the outer surface of the pipe body and communicates the outside and the inside of the pipe body.

JP 2003-147775 A

  However, the conventional drainage pipe has room for improvement in improving drainage performance.

  This invention is made | formed in view of the situation mentioned above, Comprising: It aims at improving drainage performance.

In order to solve the above problems, the present invention proposes the following means.
The drainage pipe according to the present invention includes a pipe body embedded in the ground, a protrusion provided on the outer surface of the pipe body, and an outside and an inside of the pipe body provided on the outer surface of the pipe body. And a liquid passage hole connected to the protrusion, the protrusion is formed in a spiral shape extending in the pipe circumferential direction around the pipe axis, and the liquid passage hole includes the protrusion. In the extending spiral direction, a plurality of gaps are arranged at intervals, and the intervals along the spiral direction between the liquid passing holes adjacent to each other in the spiral direction are equal to each other.
The drainage pipe according to the present invention includes a pipe body embedded in the ground, a protrusion provided on the outer surface of the pipe body, and an outside and an inside of the pipe body provided on the outer surface of the pipe body. And a fluid passage hole connected to the projecting portion, and the fluid passage hole intersects the projecting portion in a side view of the pipe body.

In this case, the underground liquid component flows along the surface of the projecting portion from the projecting end of the projecting portion toward the base end, and is drained into the pipe body through the liquid passage hole.
When the projecting part is formed in a spiral shape extending in the pipe circumferential direction, when the pipe body is embedded from the ground surface into the ground, the pipe body is rotated in the pipe circumferential direction, and the reaction force that the projecting part receives from the ground is The driving force of the pipe body can be used.
When the liquid passage hole intersects the protrusion in the side view of the pipe body, even if the strength of the pipe body is reduced by securing a wide opening area of the liquid passage hole, the decrease in this strength Can be supplemented by the reinforcing effect of the pipe body by the protruding portion.

  The pipe body may be embedded in the ground by entering from the ground surface into the ground toward the front side along the pipe axial direction.

  In this case, since the pipe body is buried in the ground by entering from the ground surface into the ground toward the front side along the pipe axial direction, the application range of this drainage pipe, for example, applying to existing ground Can be spread over a wide range.

  The protrusion may be formed in a plate shape whose front and back faces the pipe axial direction of the pipe body.

  In this case, since the projecting portion is formed in a plate shape with the front and back surfaces facing the pipe axis direction, the underground liquid component can be easily recovered over a wide range.

According to the first and second aspects of the invention, the underground liquid component flows along the surface of the protruding portion from the protruding end to the proximal end of the protruding portion, and is discharged into the pipe body through the liquid passage hole. . Therefore, it is possible to effectively collect the liquid content in the ground into the liquid holes, and the drainage performance can be improved. Thereby, for example, the ground can be stabilized.
Further, since the drainage performance can be improved by connecting the fluid passage hole to the projecting portion in this way, the opening area of the fluid passage hole can be kept small while ensuring the drainage performance. Thereby, it becomes possible to make it easy to ensure the strength of the pipe body. For example, it is possible to improve workability when the pipe body is buried in the ground.
According to the first aspect of the invention, the pipe body is rotated in the pipe circumferential direction, and the reaction force received by the protrusion from the ground can be used as the propulsion force of the pipe body. It can be made easy to embed.
According to the second aspect of the present invention, even if the strength of the pipe body is reduced by securing a wide opening area of the liquid passage hole, the reduced amount of the strength is caused by the reinforcing effect of the pipe body by the protruding portion. Can be supplemented. Therefore, it is possible to easily secure a wide opening area of the liquid passage hole while maintaining the strength of the pipe body.

According to the invention according to claim 3 , since the application range of this drainage pipe can be diversified, by applying this drainage pipe to the ground containing a large amount of liquid, for example, The effect of improving the drainage performance can be remarkably achieved.

  According to the invention which concerns on Claim 4, since it can make it easy to collect | recover the underground liquid component over a wide range, drainage performance can be improved more.

It is sectional drawing of the ground with which the drain pipe which concerns on one Embodiment of this invention was embed | buried, Comprising: The drain pipe is shown with the side view. It is a side view of the drainage pipe shown in FIG. It is the expanded view which expand | deployed the drainage pipe shown in FIG. 2 in the pipe circumferential direction. FIG. 3 is a development view in which the drain pipe shown in FIG. 2 is developed in the pipe circumferential direction so that the protrusions are continuous over the entire length in the spiral direction. It is a side view of the drainage pipe concerning the 1st modification of the present invention. It is the expanded view which expand | deployed the drain pipe shown in FIG. 5 in the pipe circumferential direction. FIG. 6 is a development view in which the drain pipe shown in FIG. 5 is developed in the pipe circumferential direction so that the protrusions are continuous over the entire length in the spiral direction. It is a side view of the drainage pipe concerning the 2nd modification of the present invention. It is a side view of the drainage pipe concerning a reference example of the present invention. It is a longitudinal cross-sectional view of the 1st verification apparatus used for the 1st verification test of this invention. It is a graph which shows the test result of the 1st verification test of this invention. It is a longitudinal cross-sectional view of the 2nd verification apparatus used for the 2nd verification test of this invention.

Hereinafter, a drainage pipe (drainage pipe) 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. For example, the drain pipe 10 can stabilize slopes such as embankment slopes and cut slopes, and can function as a landslide prevention pile.
As shown in FIGS. 1 to 4, the drain pipe 10 includes a pipe body 11, a protruding portion (blade portion, pressure receiving plate) 12, and a water passage hole (liquid passage hole) 13. In addition, in FIG. 1, illustration of the water flow hole 13 is abbreviate | omitted for convenience.

  The pipe body 11 is buried in the underground G1. The pipe body 11 is embedded in the underground G1 by entering the underground G1 from the ground surface G0 toward the front side along the pipe axis O direction. In the present embodiment, the pipe body 11 enters the underground G1 along the horizontal direction from the ground surface G0. The pipe main body 11 may be arranged parallel to the horizontal direction in the underground G1 or may be arranged inclined with respect to the horizontal direction.

  Various shapes can be adopted for the front end portion (tip portion) of the pipe body 11. For example, an end surface facing the pipe axis O direction at the front end portion of the pipe body 11 may be formed in a flat shape extending in a direction orthogonal to the pipe axis O. Further, the front end portion of the pipe body 11 may be formed in a conical shape that gradually decreases in diameter toward the front side. Furthermore, the front end portion of the pipe body 11 may be closed and closed, or may be opened and open.

The protrusion 12 is provided on the outer surface of the pipe body 11. The protrusion 12 is formed in a plate shape whose front and back faces the pipe axis O direction of the pipe body 11. The protrusion 12 is formed in a spiral shape extending in the pipe circumferential direction along the pipe axis O.
The protrusion 12 gives a propulsive force in the direction of the pipe axis O to the pipe body 11 that rotates in the pipe circumferential direction. The projecting portion 12 applies a propulsive force to the pipe body 11 that rotates clockwise when the pipe body 11 is viewed from the rear side in the pipe axis O direction, and the rear side of the pipe body 11 that rotates counterclockwise. Giving the driving force to

The protruding portion 12 is provided in a region including the front end portion in the pipe body 11. The protrusion 12 extends from the front end of the pipe body 11 toward the rear side. The rear end portion of the protruding portion 12 is located on the rear side of the center portion of the pipe body 11 in the pipe axis O direction. The protruding portion 12 extends to the pipe body 11 over two and a half halves along the pipe circumferential direction.
In the pipe body 11, a grip portion 14 is provided at a rear end portion located on the rear side of the protruding portion 12. The gripping part 14 is gripped by a rotating device such as an auger. The grip 14 is formed in a protruding shape.

  The water passage hole 13 is provided on the outer surface of the pipe body 11 and communicates the outside and the inside of the pipe body 11. As shown in FIGS. 3 and 4, a plurality of water passage holes 13 are arranged at intervals in the spiral direction in which the protrusions 12 extend. The plurality of water passage holes 13 have the same shape and the same size.

  The water passage hole 13 is connected to the protruding portion 12, and is formed in a region including a portion where the proximal end of the protruding portion 12 is connected to the outer surface of the pipe body 11. At least a part of the water passage hole 13 is located in front of the protrusion 12. The water passage hole 13 intersects the protrusion 12 in a side view of the pipe body 11. The water passage hole 13 is formed in a long hole shape extending in the pipe axis O direction and straddles the protruding portion 12 in the pipe axis O direction. In the present embodiment, the central portion of the water passage 13 in the direction of the pipe axis O is disposed on the protruding portion 12.

  Here, in the development shown in FIG. 3, the drainage pipe 10 is developed in the pipe circumferential direction with reference to a reference line L extending linearly in the pipe axis O direction on the pipe body 11. The reference line L passes through a portion of the pipe body 11 where the front end portion of the protruding portion 12 is disposed. In the development view shown in FIG. 4, the pipe body 11 is developed from the reference line L in the pipe circumferential direction so that the protrusion 12 is continuous over the entire length in the spiral direction.

  As shown in FIGS. 3 and 4, the intervals along the spiral direction of the water passage holes 13 adjacent in the spiral direction are equal to each other. While the protrusion 12 rotates once in the pipe circumferential direction, that is, during one cycle along the spiral direction of the protrusion 12, five water passage holes 13 are provided. All the water passage holes 13 are arranged so that their positions in the circumferential direction are shifted from each other. The water passage holes 13 connected to the portions of the projecting portion 12 that have different periods in the spiral direction are arranged so that the phases in the pipe circumferential direction are different from each other.

  The drain pipe 10 is manufactured as follows, for example. That is, after forming the pipe body 11 and the protruding portion 12 in which the water passage holes 13 are formed as separate members, the pipe body 11 and the protruding portion 12 are fixed by, for example, welding. Here, when the water passage hole 13 is formed in the shape of a long hole extending in the pipe axis O direction as in the present embodiment, even if the position where the protrusion 12 is fixed to the pipe body 11 is slightly shifted in the pipe axis O direction. The state in which the water passage hole 13 is connected to the protruding portion 12 can be easily maintained.

  When the drain pipe 10 enters the ground G1 from the ground surface G0 as shown in FIG. 1, the gripping portion 14 of the pipe body 11 is gripped by the rotating device, and the pipe body 11 is rotated in a state in which the pipe body 11 is allowed to move forward. Let Thereby, a propulsive force is applied to the pipe body 11, and the pipe body 11 moves forward and is buried in the underground G1. This propulsive force is based on a reaction force from a portion located on the rear side with respect to the protruding portion 12 in the ground.

  As described above, according to the drainage pipe 10 according to the present embodiment, the moisture of the underground G1 flows from the protruding end of the protruding portion 12 toward the proximal end along the surface of the protruding portion 12, and the water passage hole 13. It is drained into the pipe body 11 through. Therefore, it becomes possible to concentrate the water | moisture content of underground G1 to the water hole 13 effectively, and can improve drainage performance. Thereby, for example, the ground can be stabilized.

  Moreover, since the drainage performance can be improved by connecting the water passage hole 13 to the protruding portion 12 in this way, the opening area of the water passage hole 13 can be kept small while ensuring the drainage performance. Thereby, it becomes possible to make it easy to ensure the strength of the pipe body 11. For example, it is possible to improve workability when the pipe body 11 is embedded in the underground G1.

  Further, since the pipe body 11 is buried in the underground G1 by entering the underground G1 from the ground surface G0 toward the front side along the pipe axis O direction, the drain pipe 10 is applied to the existing ground, for example. The scope of application can be diversified. Therefore, for example, by applying the drainage pipe 10 to the ground containing a large amount of moisture, the effect of improving drainage performance can be remarkably achieved.

  Further, since the protruding portion 12 is formed in a spiral shape extending in the pipe circumferential direction, when the pipe main body 11 is embedded from the ground surface G0 to the underground G1, the pipe main body 11 is rotated in the pipe circumferential direction, and the protruding portion 12 The reaction force received from the ground can be the propulsive force of the pipe body 11. Therefore, the pipe body 11 can be easily embedded from the ground surface G0 to the underground G1.

  Moreover, since the protrusion part 12 is formed in the plate shape where the front and back faces the pipe axis O direction, it is possible to easily collect the moisture of the underground G1 over a wide range. Therefore, drainage performance can be further improved.

  Further, since the water passage hole 13 intersects the protruding portion 12 in the side view, even if the strength of the pipe body 11 is lowered by securing a wide opening area of the water passage hole 13, this strength is ensured. Can be compensated for by the reinforcing effect of the pipe body 11 by the protrusion 12. Therefore, it is possible to easily secure a wide opening area of the water passage hole 13 while maintaining the strength of the pipe body 11.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, drain pipes 30 and 40 according to a first modification and a second modification as shown in FIGS. 5 to 8 may be employed.
In the drain pipes 30 and 40 according to the first modification shown in FIGS. 5 to 7 and the second modification shown in FIG. 8, the water passage hole 13 does not intersect the protrusion 12 in the side view. In the drain pipe 30 according to the first modification, the water passage hole 13 extends from the protrusion 12 toward the front side, and is not disposed on the rear side of the protrusion 12. In the drainage pipe 40 according to the second modified example, the water passage hole 13 extends from the protrusion 12 toward the rear side, and is not disposed on the front side of the protrusion 12.

The protrusion 12 is not limited to that shown in the embodiment.
For example, a plurality of independent protrusions 12 may be provided. Moreover, the protrusion part 12 does not need to be plate-shaped. Furthermore, the protrusion 12 may not be spiral. It is also possible to employ a ridge that extends in the pipe axis O direction as the protrusion 12. The pipe body 11 can be appropriately changed to another configuration embedded in the ground G1 from the ground surface G0 by driving or press-fitting.

The water passage holes 13 are not limited to those shown in the embodiment.
For example, in the said embodiment, although each space | interval along the spiral direction of the water flow holes 13 adjacent in a spiral direction is mutually equal, this invention is not limited to this. For example, the intervals described above may be different from each other. Further, the water passage holes 13 may be provided in a concentrated manner in a part of the pipe body 11 that faces upward when the pipe body 11 is buried in the ground G1. Furthermore, the water passage hole 13 may not be a long hole shape, and the water passage hole 13 may be circular. Further, the water passage hole 13 may extend along the spiral direction of the projecting portion 12 over the entire length of the portion to which the base end of the projecting portion 12 is connected on the outer surface of the pipe body 11.
As described above, the position and shape of the water passage holes 13 can be changed as appropriate.

The grip 14 is not limited to that shown in the embodiment.
For example, it is possible to form a bolt hole as the gripping portion 14 and rotate the pipe body 11 using a bolt corresponding to the bolt hole.
Furthermore, the grip 14 may not be provided.

In the said embodiment, although the pipe main body 11 is embed | buried in underground G1 by approaching underground G1 from the ground surface G0, this invention is not limited to this. For example, the drain pipe 10 may be embedded in accordance with the ground making.
The drain pipe 10 can also discharge a liquid different from water.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

  Next, the 1st verification test and the 2nd verification test which verify the effect of this invention were implemented.

(First verification test)
In the first verification test, the amount of drainage was verified. In the first verification test, two types of drainage pipes 10 and 50 of Examples and Comparative Examples were prepared. As an example, a drain pipe 10 shown in FIGS. 1 to 4 was employed. As a comparative example, a drain pipe 50 in which the water passage hole 13 is not connected to the protruding portion 12 as shown in FIG. In addition, in each drainage pipe 10 and 50 of an Example and a comparative example, only the position where the water flow hole 13 is arrange | positioned was varied.

  For the first verification test, the first test apparatus 60 shown in FIG. 10 was used. The first test apparatus 60 includes a main body portion 61, a water supply pipe 62, and a communication portion 63. The main body 61 is formed in a cylindrical shape extending in the vertical direction. A pair of upper and lower partition plates 64 and 65 are provided in the main body 61. Of the pair of upper and lower partition plates 64, 65, the lower partition plate 64 (hereinafter referred to as “lower partition plate”) is formed to allow water to pass, and the upper partition plate 65 (hereinafter referred to as “upper partition plate”). ) Is formed so that water cannot pass through. The pair of upper and lower partition plates 64 and 65 partitions the inside of the main body 61 into an upper space 61a, an intermediate space 61b, and a lower space 61c.

  The intermediate space 61b accommodates a soil layer 66 as a virtual ground. Drain pipes 10 and 50 are inserted into the soil layer 66 from the upper side to the lower side. The drain pipes 10 and 50 penetrate the upper partition plate 65 in the vertical direction. The drain pipes 10 and 50 discharge the water in the soil layer 66 to the upper space 61a. An overflow pipe 67 is provided in the upper space 61a. The overflow pipe 67 discharges the water discharged from the drain pipes 10 and 50 to the upper space 61a to the outside from the upper space 61a.

  The water supply pipe 62 is disposed adjacent to the main body 61 and extends in the vertical direction. The upper end portion of the water supply pipe 62 is located above the upper space 61 a of the main body portion 61. The communication part 63 communicates the lower end part of the water supply pipe 62 and the lower space 61 c of the main body part 61.

  In the first test apparatus 60, water supplied from the upper end of the water supply pipe 62 to the water supply pipe 62 and supplied to the water supply pipe 62 passes through the communication part 63, the lower space 61 c of the main body part 61, and the lower partition plate 64. Infiltrate the soil layer 66. A drain pipe 68 is arranged at the upper end of the water supply pipe 62, and the water level of the water supply pipe 62 is maintained at the position where the drain pipe 68 is arranged even when water is supplied excessively.

  In the first verification test, the amount of drainage discharged from the overflow pipe 67 was measured when the drainage pipes 10 and 50 of the example and the comparative example were applied to the first test apparatus 60, respectively. In the test for each of the examples and comparative examples, the experimental conditions other than the drainage pipes 10 and 50 to be applied were the same.

The results are shown in FIG. Of the graph lines shown in FIG. 11, the graph line L1 is the result of the example, and the graph line L2 is the result of the comparative example. In addition, each amount of waste_water | drain 140 minutes after a test start was 46.0 g / min in the Example, and was 25.3 g / min in the comparative example. If the amount of wastewater in the comparative example is 1, the amount of wastewater in the example is 1.81.
From the above, it was confirmed that the drainage performance of the drainage pipe 10 according to the example is excellent.

(Second verification test)
In the second verification test, the amount of drainage and pore water pressure were verified. In the second verification test, as in the first verification test, two types of drainage pipes 10 and 50 of Examples and Comparative Examples were prepared.
For the second verification test, a second test apparatus 70 shown in FIG. 12 was used. The second test apparatus 70 includes a main body 71 and a water level gauge 72. The main body 71 is formed in a cylindrical shape extending in the vertical direction. One support plate 73 is provided in the main body 71. The support plate 73 is formed to allow water to flow, and divides the inside of the main body 71 into an upper space 71a and a lower space 71b.

A soil layer 74 as a virtual ground is accommodated in the upper space 71a. Drain pipes 10 and 50 are inserted into the soil layer 74 from the outer side in the radial direction of the main body 71 toward the inner side. The drain pipes 10 and 50 penetrate the main body 71 in the radial direction. The drain pipes 10 and 50 discharge the water in the soil layer 74 to the outside. An overflow pipe 75 is provided in the upper space 71a. The overflow pipe 75 discharges the water overflowing from the soil layer 74 to the outside from the upper space 71a.
The water level gauge 72 is formed in a tubular shape extending in the vertical direction, and is disposed adjacent to the main body 71. The upper end portion of the water level gauge 72 is opened to the atmosphere, and the lower end portion of the water level gauge 72 is communicated with the lower space 71 b of the main body portion 71.

  In the second test apparatus 70, the lower space 71 b of the main body 71 and the water level gauge 72 are filled with water, and the soil layer 74 is sufficiently supplied with water from the upper space 71 a of the main body 71. Water is supplied to the layer 74. Then, this water is drained from the overflow pipe 75 or drained from the drain pipes 10 and 50. When water is drained from the drain pipes 10 and 50, the pore water pressure in the soil layer 74 decreases. The decrease in the pore water pressure appears as a water head difference D, which is a vertical distance between the upper surface of the soil layer 74 and the water level of the water level gauge 72.

  In the second verification test, when the drainage pipes 10 and 50 of the example and the comparative example are applied to the second test apparatus 70, the amount of drainage discharged from the drainage pipes 10 and 50, and the decrease in the pore water pressure, respectively. Each was measured. In the test for each of the examples and comparative examples, the experimental conditions other than the drainage pipes 10 and 50 to be applied were the same.

As a result, the amount of each drainage after 120 minutes from the start of the test was 168.1 g / min in the example and 148.1 g / min in the comparative example. If the amount of wastewater in the comparative example is 1, the amount of wastewater in the example is 1.13.
In addition, the decrease (water head difference) in the pore water pressure was 42 mm in the example and 22 mm in the comparative example. In the second verification test, since the position head was 332 mm, the reduction rate of the pore water pressure (head difference / position head) was 12.7% in the example and 6.6% in the comparative example.
From the above, it was confirmed that the drainage performance of the drainage pipe 10 according to the example is excellent.

10, 30, 40 Drainage pipe (drainage pipe)
11 Pipe body 12 Projection 13 Water passage hole (liquid passage hole)
G0 Ground G1 Underground O Pipe shaft

Claims (4)

A pipe body buried in the ground,
A protrusion provided on the outer surface of the pipe body;
Provided on the outer surface of the pipe body, communicates the outside and the inside of the pipe body, and has a liquid passage hole connected to the protrusion ,
The protrusion is formed in a spiral shape extending in the pipe circumferential direction around the pipe axis,
A plurality of the fluid passage holes are arranged at intervals in a spiral direction in which the protrusion extends.
The drainage pipes in which the intervals along the spiral direction between the liquid passing holes adjacent to each other in the spiral direction are equal to each other . A pipe body buried in the ground,
A protrusion provided on the outer surface of the pipe body;
Provided on the outer surface of the pipe body, communicates the outside and the inside of the pipe body, and has a liquid passage hole connected to the protrusion,
The drainage pipe is a drainage pipe that intersects the protrusion in a side view of the pipe body. The drainage pipe according to claim 1 or 2, wherein the pipe body is buried in the ground by entering from the ground surface into the ground toward the front side along the pipe axial direction.   The drainage pipe according to any one of claims 1 to 3, wherein the protruding portion is formed in a plate shape whose front and back surfaces face the pipe axial direction of the pipe body.

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