JP2010249155A - Conversion joint for culvert pipe, branch joint, flexible pipe, and culvert pipe using branch joint and flexible pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent water leakage in a ventilation part of a culvert pipe and a connection part of a drain part for efficiently performing drainage of excessive water and cleaning of the culvert pipe and reducing the number of connection components used for the culvert pipe. <P>SOLUTION: In the culvert pipe including a perforated sheet pipe 10 and a resin straight pipe, a conversion joint 50, a branch joint 40, and a flexible pipe 60 are used for connection between the sheet pipe 10 and the resin straight pipe. The conversion joint 50 includes a female-type small-diameter connection port 50a, to which the perforated sheet pipe 10 is inserted liquid-tightly, and a female-type large-diameter connection port 50b to which the resin straight pipe having a diameter larger than that of the sheet pipe 10 is inserted liquid-tightly. In the branch joint 40, four female-type connection ports 40a-40d, to which the resin straight pipe is inserted liquid-tightly, are formed in cross form. The flexible pipe 60 includes a flexible pipe body 61 and a joint 62 connected to at least one end of the flexible pipe body 61 to connect the flexible pipe body 61 and the resin straight pipe together liquid-tightly. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a conversion joint, a branch joint and a flexible pipe for a culvert pipe and a culvert pipe using these.

  As a method of draining surplus water in soil such as paddy fields and fields and controlling the moisture of the soil, a culvert pipe is laid in the soil. As described in Patent Document 1, a perforated sheet pipe in which a resin-made perforated sheet formed with a large number of holes is formed into a pipe shape is often used as the underdrain pipe.

  As a method for laying a perforated sheet pipe, a perforated sheet is formed into a pipe shape with a pipe molding machine, and pulled to a depth of several tens of centimeters with a bulldozer and laid to a length of about 100 m. The method is common. For example, as schematically shown in FIG. 7, the perforated sheet pipes 10, 10 ′ thus laid are usually arranged in parallel with each other at intervals of about several meters (in this example, seven).

  When a plurality of perforated sheet pipes 10 and 10 'are laid in this way, the ventilation portion 20 is formed at one end portion and the drainage portion 30 is formed at the other end portion as shown in the illustrated example. For example, the perforated sheet pipes 10 and the perforated sheet pipes 10 ′ in which they are not formed may be alternately arranged. Then, both ends of the perforated sheet pipe 10 ′ where the ventilation part 20 and the drainage part 30 are not formed, and the ventilation part 20 and the drainage part 30 of the perforated sheet pipe 10 on both sides adjacent to the perforated sheet pipe 10 ′ Are connected by a plurality of T-shaped joints 12, 12 ′ and a communication pipe 18 as illustrated in FIG.

The ventilation part 20 and the drainage part 30 are specifically configured as shown in FIG.
That is, after the connection pipe 11a made of vinyl chloride resin is connected to one end 10a of the perforated sheet pipe 10, the connection made of vinyl chloride resin is again made through two T-shaped joints 12 connected in series. The pipe 11b is connected, then the flexible corrugated pipe 13 is connected, and the rising pipe 14 made of a vinyl chloride resin made of a straight pipe is connected. Then, the corrugated pipe 13 is bent upward at an appropriate angle so that the end 14a of the rising pipe 14 protrudes from the soil S into the atmosphere, so that a ventilation portion 20 communicating with the atmosphere is formed. A cap 15 with a vent hole is fitted to the end 14 a of the rising pipe 14.
On the other hand, after the connecting pipe 11a made of vinyl chloride resin is connected to the other end portion 10b of the perforated sheet pipe 10, it is again made of vinyl chloride resin through two T-shaped joints 12 connected in series. The connecting pipe 11b is connected, then the corrugated pipe 13 is connected, and further a drain pipe 16 made of vinyl chloride resin made of a straight pipe is connected. Then, surplus water collected in the perforated sheet pipe 10 so that the corrugated pipe 13 is bent downward at an appropriate angle so that the end 16a of the drain pipe 16 protrudes from the side surface of the drain groove D into the atmosphere. The drainage part 30 into which the wastewater flows into the drainage groove D is formed. A water tank 17 is fitted to the end 16 a of the drain pipe 16.

  As in this example, the perforated sheet pipe 10 in which the ventilation part 20 and the drainage part 30 are formed and the perforated sheet pipe 10 ′ in which these are not formed are arranged in combination, and the perforated sheet is formed by the communication pipe 18. If the culvert pipe is configured such that both ends of the pipe 10 ′ communicate with the ventilation portion 20 and the drainage portion 30, the perforated sheet pipe 10 ′ where the ventilation portion 20 and the drainage portion 30 are not formed maintains ventilation, and The collected surplus water can be drained into the drainage groove D. Such a configuration has advantages in that the formation cost can be suppressed and the construction period can be shortened as compared with the configuration in which the ventilation portion 20 and the drainage portion 30 are respectively formed in all the perforated sheet pipes 10 and 10 ′.

JP 2007-162357 A

However, in such a conventional culvert pipe, the connection part of each pipe | tube in the ventilation part 20 (The connection part of the edge part 10a of the perforated sheet pipe 10 and the connection pipe 11a, the connection of the connection pipe 11b and the corrugated pipe 13) Part, connecting part between corrugated pipe 13 and riser pipe 14), connecting part between each pipe in drainage part 30 (connecting part between end 10b of perforated sheet pipe 10 and connecting pipe 11a, connecting pipe 11b and corrugated The connecting portion with the pipe 13 and the connecting portion between the corrugated pipe 13 and the drain pipe 16) were all configured by simply fitting the ends of each pipe together. Therefore, there has been a problem of water leakage in which excess water collected in the perforated sheet pipes 10 and 10 ′ leaks into the soil S from these connecting portions.
Furthermore, since dirt and dead leaves are likely to enter the culvert pipe, a cleaning operation is usually performed in which a washing hose is inserted from the end 14a of the rising pipe 14 of the ventilation portion 20 and the earth and sand and dead leaves are discharged from the drainage portion 30. However, when such a water leak occurs in the ventilation unit 20 or the drainage unit 30 during such a cleaning operation, the earth and sand and dead leaves cannot be efficiently discharged from the drainage unit 30. A sufficient cleaning effect could not be obtained.

  Further, in such a conventional underdrain pipe, when both ends of the perforated sheet pipe 10 ′ in which the ventilation part 20 and the drainage part 30 are not formed are communicated with the ventilation part 20 and the drainage part 30, it is shown in FIG. 8. As described above, since two T-shaped joints 12 connected in series are used, there is a problem that the number of connecting parts is increased.

  The present invention has been made in view of the above circumstances, can prevent water leakage at the connecting portion of the vent portion and drainage portion of the underdrain pipe, can efficiently drain the excess water and wash the underdrain pipe, and can be used. It is an object of the present invention to provide a culvert pipe that can also suppress the number of connected parts, and a conversion joint, a branch joint, and a flexible pipe for the culvert pipe used therefor.

The conversion joint of the present invention is a conversion joint used for a culvert pipe that drains surplus water in soil, and is a female-type small-diameter connection port into which a perforated sheet pipe is inserted in a liquid-tight manner, and the perforated sheet. A female large-diameter connection port into which a straight resin pipe having a diameter larger than that of the pipe is liquid-tightly inserted is formed.
The small-diameter connection port is preferably subjected to inner surface machining.
The branch joint of the present invention is a branch joint used for a culvert pipe that drains surplus water in the soil, and four female connection ports into which a resin straight pipe is inserted in a liquid-tight manner are formed, In addition, these connection ports are formed in a cross shape.
The flexible tube of the present invention is a flexible tube used for a culvert pipe that drains surplus water in soil, and is joined to at least one end of the flexible tube main body and the flexible tube main body. The flexible pipe main body and a resin straight pipe are provided with a joint for liquid-tight connection.
The underdrain pipe of the present invention is an underdrain pipe that drains surplus water in the soil,
A perforated sheet pipe in which a perforated sheet is formed into a pipe shape;
A plurality of resin straight pipes;
A female-type small-diameter connection port into which the perforated sheet pipe is inserted in a liquid-tight manner, and a female-type large-diameter connection port into which a resin straight pipe having a larger diameter than the perforated sheet pipe is inserted in a liquid-tight manner A conversion joint formed with
A branch joint in which four female connection ports into which resin straight pipes are inserted in a liquid-tight manner are formed, and these connection ports are formed in a cross shape;
A flexible tube comprising: a flexible tube main body; and a joint that is bonded to at least one end of the flexible tube main body and fluidly connects the flexible tube main body and a resin straight pipe. A culvert pipe characterized by comprising.

  According to the present invention, it is possible to prevent water leakage at the connection portion of the vent of the underdrain pipe and the drainage portion, to efficiently drain the excess water and to wash the underdrain pipe, and to suppress the number of connecting parts used. Can be provided, and conversion joints, branch joints and flexible pipes for the culvert pipes used therefor can be provided.

It is a schematic perspective plan view which shows the example of laying of the culvert pipe of this invention. FIG. 2 is an enlarged perspective plan view in which a part of FIG. 1 is enlarged. It is a schematic longitudinal cross-sectional view which shows the structure of the culvert pipe of FIG. It is (a) sectional drawing and an (b) front view which show an example of the conversion coupling of this invention. It is (a) sectional drawing and an (b) front view which show an example of the branch joint of this invention. It is (a) partial sectional view and an (b) front view which show an example of the flexible pipe | tube of this invention. It is a schematic perspective plan view which shows the example of laying of the conventional culvert pipe. FIG. 8 is an enlarged perspective plan view in which a part of FIG. 7 is enlarged. It is a schematic longitudinal cross-sectional view which shows the structure of the culvert pipe of FIG.

Hereinafter, the present invention will be described in detail.
The underdrain pipe of the present invention controls the moisture of the soil by draining excess water contained in the soil such as paddy fields and fields. 1 is a schematic perspective plan view showing an example of laying of a culvert pipe of the present invention, FIG. 2 is an enlarged perspective plan view enlarging a part of FIG. 1, and FIG. 3 is a schematic longitudinal sectional view showing a configuration of the culvert pipe of FIG. It is.

In the underdrain pipe of this example, perforated sheet pipes 10 and 10 ′ formed by molding a polyethylene perforated sheet having a large number of holes into a pipe shape are embedded in soil S having a depth of about several tens of centimeters. It is laid.
As shown in FIG. 1, a plurality of perforated sheet pipes 10 and 10 'are arranged in parallel to each other (seven in this example), a ventilation portion 20 is formed at one end, and a drainage portion is provided at the other end. In this example, the perforated sheet pipe 10 having 30 formed therein and the perforated sheet pipe 10 'in which the ventilation portion 20 and the drainage portion 30 are not formed are alternately laid. Then, both ends of the perforated sheet pipe 10 ′ where the ventilation part 20 and the drainage part 30 are not formed, and the ventilation part 20 and the drainage part 30 of the perforated sheet pipe 10 on both sides adjacent to the perforated sheet pipe 10 ′ As shown in FIG. 2 in an enlarged manner, the ventilation portion 20 is connected to be communicated by a branch pipe 40, a T-shaped joint 12 ′, and a communication pipe 18 made of a straight pipe.

The ventilation part 20 and the drainage part 30 are specifically configured as shown in FIG.
That is, the ventilation part 20 includes a conversion joint 50 connected to one end 10a of the perforated sheet pipe 10, a connection pipe 11a made of a straight pipe made of vinyl chloride resin connected to the conversion joint 50, A branch joint 40 connected to the connection pipe 11a; a connection pipe 11b made of a straight pipe made of vinyl chloride resin connected to the branch joint 40; a flexible pipe 60 connected to the connection pipe 11b; And a riser pipe 14 made of a straight pipe made of vinyl chloride resin connected to a flexible pipe 60. And the ventilation | gas_flowing in a culvert pipe is maintained because the terminal 14a of the riser pipe 14 protrudes in air | atmosphere. A cap 15 with a vent hole is usually fitted to the end 14 a of the riser 14.
On the other hand, the drainage part 30 includes a conversion joint 50 connected to one end 10b of the perforated sheet pipe 10, a connection pipe 11a made of a straight pipe made of vinyl chloride resin connected to the conversion joint 50, A branch joint 40 connected to the connection pipe 11a; a connection pipe 11b made of a straight pipe made of vinyl chloride resin connected to the branch joint 40; a flexible pipe 60 connected to the connection pipe 11b; And a drain pipe 16 made of a straight pipe made of vinyl chloride resin and connected to the flexible pipe 60. And since the terminal end 16a of the drainage pipe 16 protrudes from the side surface of the drainage groove D into the atmosphere, surplus water collected in the culvert pipe is drained into the drainage groove D. A water tank 17 is fitted to the end 16 a of the drain pipe 16.

FIG. 4 is a view showing the conversion joint 50 used in this example.
The conversion joint 50 is made of a vinyl chloride resin, and one end 10a, 10b of the perforated sheet pipe 10 and one end of the connecting pipe 11a arranged so as to face the liquid pipe are liquid-tight. A female small-diameter connection port 50a and a female large-diameter connection port 50b, both having a circular cross section, are formed. The ends 10a and 10b of the perforated sheet pipe are liquid-tightly inserted into the small-diameter connection port 50a, and the ends of the connection pipe 11a having a larger diameter than the perforated sheet pipe are liquid-tightly inserted into the large-diameter connection port 50b. Is done. If both the small-diameter connection port 50a and the large-diameter connection port 50b are female, the connection portion can be connected without reducing the diameter. Further, in this example, as shown in the drawing, the small diameter connection port 50a is subjected to inner surface machining so that the end portions 10a and 10b of the perforated sheet pipe 10 are easily inserted.
Moreover, when connecting this conversion coupling 50, an adhesive is used for the connection in the large diameter connection port 50b, and the large diameter connection port 50b and the end of the connection pipe 11a are joined. On the other hand, no adhesive is used for the connection at the small-diameter connection port 50a, the end portions 10a and 10b of the perforated sheet pipe 10 are simply inserted, and the length can be easily adjusted during laying. Can absorb expansion and contraction of the perforated sheet pipe 10 and the connecting pipe 11a due to external factors such as air temperature.

An example of a method for producing such a conversion joint 50 is an injection molding method. In addition, a straight pipe made of vinyl chloride resin is prepared, and one end of the pipe is heated and softened with an oil bath or the like, and then a mold having a diameter larger than that of the straight pipe is inserted into the softened end. A method of cooling and expanding the diameter of this end can be exemplified.
When such a conversion joint 50 is used, the end portions 10a and 10b of the perforated sheet pipe 10 and the end portion of the connection pipe 11a can be connected with good liquid tightness in the ventilation portion 20 and the drainage portion 30. Water leakage at the connecting portion can be prevented, and excess water can be drained and culvert pipes can be efficiently washed.

FIG. 5 is a view showing the branch joint 40 used in this example.
This branch joint 40 is an injection-molded body made of vinyl chloride resin. In this branch joint 40, two female molds into which connecting pipes 11a and 11b made of straight pipes made of vinyl chloride resin are inserted in a liquid-tight manner, respectively. The connection ports 40a and 40b are formed at positions facing each other, and the two female connection ports 40c and 40d into which the communication pipe 18 made of a straight pipe made of vinyl chloride resin is inserted in a liquid-tight manner are facing each other. Is formed. These four connection ports 40a to 40d are formed in a cross so that the angles formed by the adjacent connection ports are all 90 degrees. Further, these four connection ports 40a to 40d are all circular in cross section and have the same diameter. When each of the connection ports 40a to 40d is a female type, the connection portion can be connected without reducing the diameter.
In this example, an adhesive is used for connection at each of the connection ports 40a to 40d, and the connection ports 40a to 40d are joined to the end portions of the connection tubes 11a and 11b and the communication tube 18 inserted therein. .

  When such a branch joint 40 is used, a total of four of the two communication pipes 18 and the two connection pipes 11a and 11b can be connected by one member in the ventilation part 20 and the drainage part 30. Thus, it is not necessary to connect and use the two T-shaped joints 12 as in the prior art. Therefore, the number of connection parts used for laying a culvert pipe can be suppressed. Further, since the connection ports 40a to 40d are formed in a cross shape, the connection pipes 11a and 11b and the communication pipe 18 can be connected at right angles as shown in FIG. 2 to constitute a culvert pipe as shown in FIG. .

FIG. 6 is a diagram showing a flexible tube 60 used in this example.
The flexible tube 60 includes a flexible tube main body 61 that can be bent, and a straight pipe joint 62 made of a vinyl chloride resin joined to both ends thereof by an adhesive 63. Each joint 62 used here has a female large-diameter connection port 62a into which the flexible tube body 61 is liquid-tightly inserted, and a female small-diameter connection port 62b having a smaller diameter. Are formed respectively.
In the ventilation portion 20, the rising tube 14 is liquid-tightly inserted into the small diameter connection port 62 b of one joint 62 in the ventilation portion 20, and the flexible tube main body 61 is bent upward at an appropriate angle. Thus, the end 14a of the rising pipe 14 is projected into the atmosphere. The connecting pipe 11b is liquid-tightly inserted into the small diameter connection port 62b of the other joint 62.
On the other hand, in the drainage section 30, the drain pipe 16 is liquid-tightly connected to the small-diameter connection port 62b of one joint 62, and the flexible pipe body 61 is bent downward at an appropriate angle. The end 16a of the drainage is projected from the side surface of the drainage groove D into the atmosphere. The connecting pipe 11b is liquid-tightly inserted into the small diameter connection port 62b of the other joint 62.
When both the small-diameter connection port 62b and the large-diameter connection port 62a are female, the connection portion can be connected without reducing the diameter.
Further, in this example, an adhesive is also used for connection at the small diameter connection port 62b, and the small diameter connection port 62b is joined to each end of the connection pipe 11b, the rising pipe 14, and the drain pipe 16 inserted therein.
Examples of the flexible tube main body 61 include a corrugated tube made of a resin such as vinyl chloride resin, a duct tube, and a rubber tube. Any flexible tube may be used.

When such a flexible pipe 60 is used, the flexible pipe body 61 and the connecting pipe 11b, the rising pipe 14 and the drain pipe 16 are connected with good liquid tightness in the ventilation part 20 and the drainage part 30, respectively. It is possible to prevent leakage of water at the connecting portion, and to efficiently drain excess water and wash the underdrain pipe.
In this example, a straight tubular joint 62 is used, but if necessary, a curved tubular joint whose angle between the large diameter connection port 62a and the small diameter connection port 62b is other than 180 degrees is used. Also good.
Further, the flexible tube may be one in which the joint 62 is joined to only one end of the flexible tube main body 61. In that case, the connection pipe 11 b is connected to the small diameter connection port 62 b of the joint 62. In the flexible tube main body 61, the end portion on the side where the joint 62 is not joined is directly projected from the soil S into the atmosphere in the ventilation portion 20, and in the drainage portion 30 from the side surface of the drainage groove D. It only has to protrude inside. If it does so, since it becomes unnecessary to use the riser pipe 14 in the water flow part 20, and it becomes unnecessary to use the drain pipe 16 in the drainage part 30, it suppresses the number of connection parts used for laying of a culvert pipe. Can do.

S soil 10, 10 'perforated sheet pipe 40 branch joint 40a-40d connection port 50 conversion joint 50a small diameter connection port 50b large diameter connection port 60 flexible pipe 61 flexible pipe main body 62 joint

Claims (5)

A conversion joint used for a culvert pipe that drains surplus water in soil,
A female-type small-diameter connection port into which the perforated sheet pipe is inserted in a liquid-tight manner and a female-type large-diameter connection port into which a straight resin pipe having a larger diameter than the perforated sheet pipe is inserted in a liquid-tight manner. A conversion joint characterized by being formed.   The conversion joint according to claim 1, wherein the small-diameter connection port is internally chamfered. A branch joint used for a culvert pipe that drains surplus water in the soil,
A branch joint characterized in that four female connection ports into which a resin straight pipe is inserted in a liquid-tight manner are formed, and these connection ports are formed in a cross shape. A flexible pipe used for a culvert pipe that drains excess water in the soil,
A flexible tube main body and a joint that is joined to at least one end of the flexible tube main body and that fluid-tightly connects the flexible tube main body and a resin straight pipe are provided. Flexible tube. A culvert pipe that drains excess water in the soil,
A perforated sheet pipe in which a perforated sheet is formed into a pipe shape;
A plurality of resin straight pipes;
A female-type small-diameter connection port into which the perforated sheet pipe is inserted in a liquid-tight manner, and a female-type large-diameter connection port into which a resin straight pipe having a larger diameter than the perforated sheet pipe is inserted in a liquid-tight manner A conversion joint formed with
A branch joint in which four female connection ports into which resin straight pipes are inserted in a liquid-tight manner are formed, and these connection ports are formed in a cross shape;
A flexible tube comprising: a flexible tube main body; and a joint that is bonded to at least one end of the flexible tube main body and fluidly connects the flexible tube main body and a resin straight pipe. A culvert pipe characterized by comprising.

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