JP2004000885A - Clogging prevention apparatus for water collecting pipe for ground water removal facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive apparatus for preventing the clogging of a water collecting pipe for a groundwater removal facility which can quickly remove clogging substances generated in the water collecting pipe to the land surface and prevent clogging of the water collecting pipe without using a complicated mechanical structure or power. <P>SOLUTION: The clogging prevention apparatus comprises a water collecting pipe 2 whose one end is closed and the other end is opened and which is downward slantingly buried at a position lower than the groundwater surface of a ground 1 while the opened end being projected out of the soil wall face 3. The strainers 4 are bored on the water collecting pipe, an approximately S-shaped extension pipe 7 is connected to the projected opened end in such a manner that once stored groundwater from the water collecting pipe 2 can be discharged by function of a siphon, and a ventilation pipe 10 is installed toward the extension pipe from the vicinity of the connection part of the extension pipe and the water collecting pipe. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a device for automatically discharging clogging substances adhering and accumulating in a drainage pipe for a groundwater drainage facility together with collected groundwater to the surface of the ground. It can be used for underground water drainage facilities such as boring and culverts in paddy fields and fields.
[0002]
[Prior art]
One of the landslide prevention technologies is a method of burying a groundwater collecting pipe provided with a strainer in the ground and discharging groundwater to the surface through the collecting pipe, thereby lowering the groundwater level and suppressing the occurrence of landslide. . Landslide countermeasures using groundwater collection pipes have been implemented in many areas, but it has been confirmed that clogging of strainers has reduced the groundwater drainage function, and there is a concern that the effect on the landslide deterrent effect will be affected (clogging). Researchers at the Public Works Research Institute have confirmed that the substance causing the formation is mainly iron bacteria that utilizes iron in groundwater.) In order to recover the lowered groundwater exclusion function, clogging substances deposited and deposited in the collecting pipe have been removed by washing the inner wall of the collecting pipe with high water pressure. However, with regard to cleaning with high-pressure water, regular maintenance of groundwater collection pipes has caused an increase in maintenance and management costs, and the development of rational maintenance and management techniques for groundwater collection pipes has become an issue. .
[0003]
[Problems to be solved by the invention]
Therefore, the present invention was devised to solve the conventional problems as described above, and quickly eliminates clogging substances generated in a water collection pipe without using inexpensive power and complicated mechanical structures. An object of the present invention is to provide a device for preventing clogging of a water collection pipe for a groundwater elimination facility, which can be discharged to the surface of the ground to prevent clogging of the water collection pipe.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, in the invention described in claim 1, a water collection pipe having one end closed and the other end opened has a second end opening protruding from the soil wall surface at a position below the groundwater surface of the ground. In this state, it is buried with a downward slope, a strainer is drilled in this water collection pipe, and a substantially S-shaped extension pipe stores groundwater from the water collection pipe in the opening at the other end of the water collection pipe. The drain pipe is installed so as to be capable of being discharged by the action, and a ventilation pipe is installed from the vicinity of the connection between the extension pipe and the water collecting pipe toward the inside of the extension pipe.
[0005]
In the invention described in claim 2, the water collection pipe having both ends opened is located below the ground surface with paddy fields and fields, one end opening protrudes from the ground surface, and the other end opening is formed from the soil wall to the other end opening. It is buried with a downward inclination in a protruding state, and a strainer is drilled in this water collection pipe, and a substantially S-shaped extension pipe stores groundwater from the water collection pipe in the protruding other end opening. It is characterized by being installed so as to be able to discharge by the action of a siphon.
[0006]
According to a third aspect of the present invention, in the first or second aspect, the extension pipe has one end connected to the other end opening of the water collection pipe, the other end opening downward, and the middle part being substantially U-shaped. The height of the bottom of the reservoir is lower than the height of the opening at the other end of the collecting pipe, and the height of the top at the other end of the collecting pipe is the height of the one-end closing part of the collecting pipe. It is characterized by being lower than the height.
[0007]
According to a fourth aspect of the present invention, in the third aspect, a second extension pipe is swingably connected to a position above and below a horizontal position by a pivot shaft at the other end opening of the extension pipe, A counterweight is attached to the pivot, and the second extension tube overcomes the counterweight when filled with groundwater sent from the extension tube when in the upper position. Thus, while discharging the groundwater by the siphon, the counterweight is brought to the upper position by the counterweight when drainage of the groundwater is completed. The invention described in claim 5 is characterized in that, in claim 4, the counterweight is movable on a mounting shaft fixed in a direction crossing the pivot shaft. According to a sixth aspect of the present invention, in the fourth aspect, the case is mounted on the mounting shaft fixed in a direction crossing the pivot shaft, and the counterweight is rotatably accommodated in the case. It is characterized by. In this case, the case is preferably a closed hollow shape, and the weight is preferably one or more metal balls.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a first embodiment in which a landslide is installed on a ground. Reference numeral 1 denotes a ground, and a water collecting pipe 2 is buried in the ground at a position slightly below the groundwater surface so as to protrude partially from the soil wall surface 3. The water collecting pipe 2 is a hollow cylindrical pipe, one end of which is closed so that earth and sand do not enter, and the other end of which is protruded and opened. As shown in the figure, the water collecting pipe 2 is arranged so as to be inclined downward from one end to the other end. A plurality of strainers 4 are formed at predetermined intervals in the length direction of the water collecting pipe 2. A substantially S-shaped extension pipe 7 is connected to the other end opening of the water collecting pipe 2 using a plurality of elbow pipes 5a to 5e. That is, the extension pipe 7 includes an elbow pipe 5a, a vertical short pipe 6a, an elbow pipe 5b, a horizontal short pipe 6b, an elbow pipe 5c, a vertical short pipe 6c, an elbow pipe 5d, a horizontal short pipe 6d, an elbow pipe 5e, A vertically oriented short pipe 6e is sequentially connected, and one end of an elbow pipe 5a is connected to the other end opening of the water collecting pipe 2, the other end of the short pipe 6e opens downward, and the elbow pipe 5a, a short pipe 6a, an elbow pipe 5b, a short pipe 6b, an intermediate part composed of an elbow pipe 5c, a short pipe 6c, an elbow pipe 5d, a short pipe 6d, and an elbow pipe 5e are formed in a substantially U-shaped groundwater reservoir. I have. The downward opening of the short pipe 6 e faces the drainage channel 8.
[0009]
A ventilation pipe 10 is inserted from above the elbow pipe 5a into the water collecting pipe 2. The ventilation pipe 10 constantly adjusts the atmospheric pressure in the water collecting pipe 2 to the atmospheric pressure so that the pressure in the water collecting pipe 2 does not become negative so that the groundwater stored in the water collecting pipe 2 is easily drained. The ventilation pipe 10 is formed of a small-diameter hollow pipe, and is fastened and supported in the water collecting pipe 2 by a fastener 11, one end of which is open near one end closing portion of the water collecting pipe 2 and the other end penetrates the elbow pipe 5a. Protruding outside and open downward. A sealing member (not shown) is provided at a penetrating portion between the ventilation pipe 10 and the elbow pipe 5a.
[0010]
The height h1 of the short pipe 6b of the extension pipe 7 (height of the bottom of the groundwater storage part) is lower than the height h2 of the other end opening on the lower end side of the water collecting pipe 2, and the height of the short pipe 6d (the height The height h3 at the other end side of the groundwater reservoir is lower than the height h4 of the one end closed portion of the water collecting pipe 2, and the height h5 of the lower end opening of the short pipe 6e is lower than the height h1 of the short pipe 6b. Has become. As a result, the groundwater collected in the water collection pipe 2 is intermittently and vigorously drained to the ground surface together with the clogging substance deposited and deposited in the water collection pipe 2 by the action (principle) of the siphon.
[0011]
That is, the groundwater flows from the strainer 4 into the water collecting pipe 2 and is stored therein. When the level of the stored groundwater becomes higher than the short pipe 6d of the extension pipe 7, the shortage of the extension pipe 7 is caused by the action of the siphon. The water flows from the lower end opening of the pipe 6e and drains. At that time, the clogging substance generated in the water collecting pipe 2 is also discharged together with the groundwater. Thereafter, the level of the stored groundwater falls to the height h1 of the short pipe 6b, air flows into the short pipe 6d, the siphon action is not established, and the outflow of the groundwater stops. Then, the storage of groundwater starts again, and the same is repeated.
[0012]
FIG. 2 shows a second embodiment in the case where the present invention is used for paddy fields and fields for agriculture. The second embodiment is different from the first embodiment in that one end of a water collecting pipe 22 is opened, an air intake pipe 25 is connected to the opening through an elbow pipe 23, and the upper end opening is a paddy field. It is a point that is open to the ground surface where the orchard 21 is located. Other configurations are the same as those of the first embodiment, and the same portions are denoted by the same reference numerals and description thereof will be simplified. In the above description, the air intake pipe 25 is provided, but the opening at one end of the water collecting pipe 22 may be integrally extended to form an extended pipe, and may be opened to the ground surface where paddy fields and fields are located. Further, the air intake pipe 25 or the extension pipe section does not necessarily have to have the same diameter as the water collecting pipe 22, and may have a smaller diameter.
[0013]
Also in the second embodiment, the water flows from the strainer 4 into the water collecting pipe 22 and is stored therein. When the height of the water level of the stored groundwater becomes higher than the short pipe 6d of the extension pipe 7, the water is extended by the action of the siphon. From the lower end opening of the short pipe 6e of the pipe 7, the water flows vigorously and is drained. At that time, the clogging substance attached to the water collecting pipe 22 is discharged cleanly together with the groundwater, and the same operation as in the first embodiment can be expected. .
[0014]
FIG. 3 shows a third embodiment. The third embodiment is a modification of the first embodiment, and a second extension pipe 13 is connected to the lower end opening of the short pipe 6e of the extension pipe 7. That is, the second extension pipe 13 is configured by sequentially connecting an elbow pipe 5f, a horizontally oriented short pipe 6f, and a short pipe 6g, and the short pipe 6g is horizontally connected to the short pipe 6f via the pivot shaft 14. It is swingable from a position above a position indicated by a solid line and a position below a chain line. The connecting portion between the two tubes 6g and 6f is formed of a flexible member such as a bellows-like body (not shown) so as to maintain watertightness in the two tubes during swinging.
[0015]
The pivot shaft 14 is supported by a support stand 15 installed in the drainage channel 8, and a base end of a mounting shaft 16 having a predetermined length is fixed to a shaft end thereof in a direction perpendicular to the shaft. A stopper 17 is fixed to the distal end side of the mounting shaft 16, and a counterweight 18 is reciprocally mounted on the mounting shaft 16 between the stopper and the distal end as shown by an arrow. Other configurations are the same as those of the first embodiment, and the same portions are denoted by the same reference numerals and description thereof will be simplified.
[0016]
According to the embodiment as described above, in a state where the short pipe 6g of the second extension pipe 13 is at the upper position shown by the solid line, the groundwater flowing from the water collection pipe 2 passes through the extension pipe 7, It is stored in the second extension pipe 13. When the amount of groundwater in the second extension pipe 13 is small, the weight 18 is at the lower position. As the groundwater gradually fills the inside of the second extension pipe 13, the balance between the weight of the short pipe 6g and the weight 18 is lost, and the short pipe 6g starts to fall around the pivot 14 as a fulcrum. At this time, the weight 18 is lifted up, moves on the mounting shaft 16 to the stopper 17 side, and acts so that the balance is further lost. Then, when the inside of the short pipe 6g is filled with groundwater, the weight of the groundwater flow overcomes the weight 18 and the fall of the short pipe 6g is ensured, and the short pipe 6g is located at the lower position indicated by the chain line. Brought to you. At the same time, the groundwater stored in the second extension pipe 13 is vigorously discharged from the lower end opening of the short pipe 6g, and at this time, the upper bent portion of the extension pipe 7 (in the vicinity of the short pipe 6d and the elbow pipes 5d and 5e). A negative pressure is generated in the inside. As a result, the groundwater stored in the water collecting pipe 2 is sucked from the upper bent portion toward the lower end of the extension pipe 7, and a siphon is formed.
[0017]
Due to the formation of the siphon, the groundwater stored in the water collecting pipe 2 is discharged from the lower end opening of the short pipe 6g together with the clogging substance accumulated in the water collecting pipe 2 at a stretch. Thereafter, as the amount of groundwater in the second extension pipe 13 decreases, the balance between the weight and the weight of the short pipe 6g is lost, and the short pipe 6g starts rising from the pivot 14 as a fulcrum. At this time, the weight 18 tilts to the original position side, moves on the mounting shaft 16 to the side away from the stopper 17, and acts so that the balance is further lost. This ensures that the short tube 6g rises up and returns the short tube 6g to its original position.
[0018]
As described above, in the first embodiment shown in FIG. 1, when the amount of groundwater collected in the water collection pipe 2 is small, the air in the pipe is not entrained to the groundwater and a siphon may not be easily formed. In the embodiment, since a siphon is formed even when the flow rate in the water collecting pipe 2 is small by utilizing a negative pressure generated when the groundwater stored in the pipe is discharged, the groundwater can be discharged more effectively.
[0019]
FIG. 4 shows a modification of the counterweight shown in the third embodiment. In this modification, a hollow sealed case 19 is provided at the tip of the mounting shaft 16, and a counterweight 18a is indicated by an arrow in the case. As shown, it is housed so that it can roll freely in the axial direction of the mounting shaft 16. The weight 18a is made of, for example, one or a plurality of metal balls, and is located on the tip side of the case 19 when the mounting shaft 16 is located below as shown by the solid line, and the mounting shaft 16 is located above as shown by the chain line. When it is positioned, it rolls and is located on the proximal end side of the case 19, and by rolling in the case in this manner, an unbalance effect is generated. The other configuration is the same as that of the third embodiment. In the case of this modification, in addition to expecting the same operation and effect as described above, the rolling weight 18a is housed in the sealed case 19, so that malfunction does not occur and a mechanism with few failures is provided. Can be expected.
[0020]
In the above embodiments, the materials of the water collecting pipes 2, 22, the extension pipe 7, the second extension pipe 13, the ventilation pipe 10, and the air intake pipe 25 are not specified, but the pipes are made of a resin pipe such as a vinyl chloride pipe. This is preferable from the viewpoints of corrosiveness and economy (cost). In addition, the shapes of the extension pipes 7 and the second extension pipes 13 and the configuration members thereof, such as the shapes of the water collection pipes 2 and 22 and the size and number of the strainers 4 provided therein, are also arbitrary. It can be changed or modified.
[0021]
【The invention's effect】
The invention according to claims 1 to 3 is as described above, wherein the air pressure in the collecting pipe is adjusted by a ventilation pipe or the like, and the groundwater stored in the collecting pipe is intermittently and vigorously discharged to the ground surface by the action of the siphon. be able to. That is, clogging substances are simultaneously discharged to the ground surface using the sweeping power of the discharged water, thereby preventing clogging of the water collection pipe and realizing the maintenance of the initial function relating to groundwater elimination. In addition, the apparatus is inexpensive, does not require the use of power and a complicated mechanical structure, is extremely practical, and has high industrial utility. The fourth, fifth, and sixth aspects of the invention have an excellent effect that the groundwater can be discharged more effectively because the siphon is formed even when the flow rate of the groundwater in the collecting pipe is small.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a first embodiment of the present invention in which a landslide is installed on a ground.
FIG. 2 is a schematic diagram showing Embodiment 2 installed in a field for agriculture.
FIG. 3 is a schematic diagram showing a third embodiment obtained by improving the first embodiment;
FIG. 4 is a schematic diagram showing a modification of the third embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ground 2 Water collecting pipe 3 Soil wall 4 Strainer 5a-5f Elbow pipe 6a-6g Short pipe 7 Extension pipe 8 Drainage channel 10 Vent pipe 11 Fastener 13 Second extension pipe 14 Pivot shaft 15 Support stand 16 Mounting shaft 17 Stoppers 18, 18a Counterweight 19 Hollow case 22 Water collecting pipe 23 Elbow pipe 25 Air intake pipe

Claims (6)

A water collection pipe with one end closed and the other end opened is buried at a position below the groundwater surface of the ground with a downward slope with the other end opening protruding from the soil wall, and a strainer is drilled in this water collection pipe. A substantially S-shaped extension pipe is installed at the protruding other end opening so as to store groundwater from the water collection pipe and connect so as to be dischargeable by the action of a siphon. An apparatus for preventing clogging of a water collection pipe for a groundwater drainage facility, wherein a ventilation pipe is installed from a vicinity of a connection part of the water pipe to an inside of the extension pipe. A water collection pipe with both ends opened below the ground surface with paddy fields and fields, one end opening protrudes from the ground surface, and the other end opening is buried with a downward slope with the other end protruding from the soil wall surface A strainer is bored in this water collection pipe, and a substantially S-shaped extension pipe is connected to the protruding other end opening so as to store groundwater from the water collection pipe and discharge it by the action of a siphon. An apparatus for preventing clogging of a drainage pipe for a groundwater elimination facility, which is installed in a vertical position. The extension pipe has one end connected to the other end opening of the water collection pipe, the other end opened downward, and an intermediate part formed in a substantially U-shaped groundwater storage part, and a bottom part of the storage part. 3. The groundwater exclusion according to claim 1, wherein the height of the reservoir is lower than the height of the other end opening of the water collecting pipe, and the height of the other end side of the storage part is lower than the height of the one end closing part of the water collecting pipe. A device for preventing clogging of water collection pipes for facilities. A second extension pipe is swingably connected to a position above and below a horizontal position by a pivot shaft at the other end opening of the extension pipe, and a counterweight is attached to the pivot shaft, When the second extension pipe is filled with the groundwater sent from the extension pipe in the upper position, the second extension pipe overcomes the counterweight and is brought to the lower position, and the groundwater by the siphon is provided. 4. The device for preventing clogging of a water collection pipe for a groundwater exclusion facility according to claim 3, wherein when the discharge of the groundwater is completed, the drainage is brought to an upper position by a counterweight. The apparatus for preventing clogging of a water collection pipe for a groundwater exclusion facility according to claim 4, wherein the counterweight is movable on a mounting shaft fixed in a direction crossing the pivot shaft. 5. The prevention of clogging of a water collecting pipe for a groundwater exclusion facility according to claim 4, wherein the case is mounted on a mounting shaft fixed in a direction crossing the pivot shaft, and the counterweight is rotatably accommodated in the case. apparatus.

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