JP2015196954A - Ground water level adjusting lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely adjust a water level while suppressing an increase in the cost.SOLUTION: A ground water level adjusting lock 40 includes: an external cylinder 41 having an introduction port 44 connected to a culvert pipe 13 buried in the ground and a drain port 45 connected to a drain pipe 14 on a bottom portion thereof, and upwardly extended from the bottom portion; an internal cylinder 42 provided in the external cylinder 41, having a lower end connected to the drain port 45, and having a plurality of through holes 46 formed in a vertical direction; and a closing cover 43 attached to an outer peripheral surface of the internal cylinder 42 and capable of closing the through holes 46 in accordance with an attachment position in the vertical direction with respect to the internal cylinder 42. The closing cover 43 can be switched between a state of being elastically deformable in a radial direction of the internal cylinder 42 to the outer peripheral surface of the internal cylinder 42 and closing the through holes 46 by being firmly attached to the outer peripheral surface of the internal cylinder 42 and a state of being elastically deformed from the outer peripheral surface of the internal cylinder 42 to the radial direction outer peripheral side and slidably movable in the vertical direction along the internal cylinder 42.

Description

  The present invention relates to a groundwater level adjusting water tank for adjusting a groundwater level in a field or the like.

  Underground irrigation systems are used to supply water to crops in upland and rice crops. In the underground irrigation system, the water introduced from the irrigation channel through the irrigation mass is passed through the culvert pipe buried in the ground, and water is supplied to the ground by the water that oozes out from the culvert pipe into the ground. A drain pipe is connected to the downstream side of the culvert pipe so that the drain pipe can drain into the drainage channel. The drainage pipe is provided with a water tank as an open / close valve for the underground irrigation system.

  By the way, in field cropping, the groundwater level suitable for growth differs depending on the type of crop. Therefore, a water tank capable of adjusting the groundwater level is provided downstream of the underdrain pipe.

  Patent Document 1 discloses a configuration including a cylindrical valve rod in which a plurality of water level adjustment holes are formed and a water level adjustment collar provided on the outer periphery of the valve rod as a groundwater level adjustment water tank. Yes. In this configuration, the water level adjusting hole exposed is changed by changing the water level adjusting hole to adjust the groundwater.

  In Patent Document 2, a cylindrical waterstop tube in which a plurality of drain holes are formed at different height positions in the vertical direction, and a cylindrical shape that can be slidably rotated with respect to the outer peripheral surface of the waterstop tube, are rotated with respect to the waterstop tube. The structure provided with the rotation cylinder which has a slit which opens the drain hole of a different position according to a position is disclosed. In this configuration, the drainage hole exposed from the slit is selected by rotating the rotating cylinder with respect to the waterstop cylinder, and the groundwater level is adjusted.

Japanese Patent No. 4745103 JP 2012-132252 A

However, in the configuration disclosed in Patent Document 1, in order to maintain the water level adjusting collar at a desired height with respect to the valve stem, the frictional force between the outer peripheral surface of the valve stem and the inner peripheral surface of the water level adjusting collar is set. Used.
For this reason, in order to prevent displacement of the water level adjustment collar, it is necessary to increase the frictional force between the valve stem and the water level adjustment collar. However, increasing the frictional force makes it difficult to adjust the position of the water level adjustment collar.
On the other hand, in order to easily adjust the position of the water level adjustment collar, if the frictional force between the water level adjustment collar and the valve stem is reduced, that is, if the clearance between the water level adjustment collar and the valve stem is increased, the misalignment of the water level adjustment collar will occur. Or water leaks from the clearance between the water level adjustment collar and the valve stem.

On the other hand, in the configuration disclosed in Patent Document 2, since the rotating cylinder is rotated with respect to the water blocking cylinder, the water level can be easily adjusted by rotating the rotating cylinder with a smaller force. And since a rotation cylinder performs rotation operation instead of a vertical motion, the position shift by dead weight does not arise.
However, the configuration disclosed in Patent Document 2 requires a water stop tube, a rotating tube, and a handle for rotating the rotating tube, which increases the number of parts, leading to an increase in cost.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a groundwater level adjustment water tank capable of easily and reliably adjusting the water level while suppressing an increase in cost.

The present invention employs the following means in order to solve the above problems.
The groundwater level adjustment water tank according to the present invention comprises an inlet connected to a culvert pipe buried in the ground and a drain outlet connected to a drain pipe at the bottom, an outer cylinder extending upward from the bottom, and An inner cylinder that is provided in the outer cylinder and has a lower end connected to the drain port and formed with a plurality of through holes in the vertical direction, and is mounted on the outer peripheral surface of the inner cylinder, and is mounted in the vertical direction on the inner cylinder A closing cover capable of closing the plurality of through-holes depending on the position, and the closing cover is attached to the outer peripheral surface of the inner cylinder so as to be elastically deformable in the radial direction of the inner cylinder, A state in which the through-hole is closed in close contact with the outer peripheral surface of the cylinder, and a state in which the outer cylinder is elastically deformed radially outward from the outer peripheral surface of the inner cylinder and is slidable in the vertical direction along the inner cylinder. It is characterized by being deformable between.

According to such a configuration, by changing the position of the closing cover relative to the inner cylinder in the vertical direction, the plurality of through holes can be appropriately closed, and the groundwater level can be adjusted. When the closing cover is moved in the vertical direction, the closing cover can be easily slid by being elastically deformed and expanded outward in the radial direction of the inner cylinder. And after the movement of the closing cover, the closing cover is brought into close contact with the outer peripheral surface by being deformed radially inward and returning to its original shape.
Such a configuration can be realized with a simple configuration because the closing cover only needs to be elastically deformable in the radial direction.

  Moreover, in the underground water level adjusting water tank according to the present invention, the blocking cover may have a cylindrical shape with a C-shaped cross-section with a part of the circumferential direction cut away.

  By comprising in this way, the obstruction | occlusion cover can be made elastically deformable to the radial direction of an inner cylinder by simple structure by expanding the notched part.

  Moreover, the underground water level adjusting water tank according to the present invention may be provided with a restraining member that is provided on an outer peripheral portion of the closing cover and restrains deformation of the closing cover toward a radially outer peripheral side.

  By comprising in this way, the obstruction | occlusion cover can contact | adhere to the outer peripheral surface of an inner cylinder, and it can maintain reliably the state which obstruct | occludes a through-hole.

  Moreover, in the underground water level adjusting water tank according to the present invention, the inner cylinder may be detachably connected to the drain port.

  By comprising in this way, the water which flows in from a culvert tube can be poured into a drain outlet as it is, and the culvert tube can be flushed.

  In the groundwater level adjusting water tank according to the present invention, an opening is formed in the outer peripheral surface of the upper end portion of the inner cylinder, and the inner cylinder is inserted into the inner peripheral surface of the outer cylinder by inserting the inner cylinder into the opening. You may make it provide the latching | locking part latched in the state removed from the drain outlet.

  By configuring in this way, flushing can be performed while the inner cylinder is housed in the outer cylinder by locking the opening of the inner cylinder removed from the drain port with the locking portion.

  According to the water table for adjusting the groundwater level according to the present invention, the position of the closed cover after movement can be reliably fixed with a simple configuration while easily moving the closed cover, so that the water level can be adjusted while suppressing an increase in cost. It becomes possible to carry out easily and reliably.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the whole structure of the underground irrigation system using the groundwater level adjustment water tank which concerns on one Embodiment of this invention, and is sectional drawing which shows the structure in the case of performing field cropping. It is a figure which shows the inner cylinder and obstruction | occlusion cover with which the groundwater level adjustment water tank was equipped, (a) is a front view, (b) is a side view. It is a figure which shows the state which pulled out the inner cylinder from the drain outlet of the outer cylinder, and was made to latch to a latching | locking part. It is sectional drawing which shows the structure in the case of performing rice cultivation with the underground irrigation system of this embodiment. It is a figure which shows the structure of the modification of the said groundwater level adjustment water tank, (a) is a front view which shows the inner cylinder which used the through-hole as the permanent hole, (b) is a side view of (a), (c) is ( It is a rear view of a). It is a figure which shows the structure of the other modification of the said groundwater level adjustment water tank, (a) is a front view which shows the inner cylinder which provided the rotary type | mold obstruction | occlusion cover, (b) is a side view of (a). . It is a perspective view which shows the principal part of FIG. It is a figure which shows the structure of the other modification of the said groundwater level adjustment water tank, and is a partial cross section figure of a groundwater level adjustment water tank provided with the inner cylinder which provided the obstruction cover made from rubber | gum. It is an expanded sectional view of the lower end part of a rubber closure cover. It is a figure which shows the water mass only for field crops, (a) is a top view, (b) is sectional drawing.

  Hereinafter, with reference to an accompanying drawing, the form for carrying out the groundwater level adjustment water tank by the present invention is explained. However, the present invention is not limited only to this embodiment.

  FIG. 1 is a schematic diagram showing an overall configuration of an underground irrigation system using an underground water level adjusting water tank according to an embodiment of the present invention. FIG. 2 is a view showing an inner cylinder and a closing cover provided in the underground water level adjusting water tank, wherein (a) is a front view and (b) is a side view. FIG. 3 is a view showing a state in which the inner cylinder is pulled out from the drain port of the outer cylinder and is locked by the locking portion. FIG. 4 is a cross-sectional view showing a configuration when rice cultivation is performed in the underground irrigation system of the present embodiment.

  As shown in FIG. 1, an underground irrigation system 10 includes a water mass 20 connected to a water channel (external) 1, a water supply pipe 12 connected to the water mass 20 and extending downward, and a water supply pipe 12 connected to a predetermined water pipe. Underground pipe 13 buried in the ground with a water gradient, groundwater level adjustment tank 40 connected downstream of the underdrain pipe 13, and drainage pipe connected between the groundwater level adjustment tank 40 and the drainage channel 2 14.

The water mass 20 includes a mass main body 21, a strainer 25, and a lid body 28.
The mass body 21 has an opening 21a formed on the upper side, a water inlet 22 and a side drain 24 formed on the side surface, and a bottom drain 23 formed on the bottom surface.

  The intake pipe 11 is connected to the water inlet 22, and water is taken into the mass body 21 from the irrigation channel 1. A plurality of the water inlets 22 may be provided.

  The side water outlet 24 can be connected to a water supply pipe 15 (see FIG. 4) that supplies water to the paddy field. The side drain port 24 can be closed by a detachable stop cock 26. The water stop cock 26 is preferably connected to the mass body 21 by a chain, a wire, etc. (not shown) in order to prevent scattering and theft.

A water supply pipe 12 extending downward is connected to the bottom drain port 23. A strainer 25 is attached to the bottom drain port 23.
The strainer 25 is cylindrical and has insertion portions 25a and 25b that can be inserted into the bottom drainage port 23 at both ends. The insertion portions 25a and 25b are tapered so that the outer diameter gradually decreases as they approach the tip. Accordingly, when the insertion portions 25a and 25b are inserted into the bottom drainage port 23, the insertion portions 25a and 25b and the bottom drainage port 23 are brought into close contact with each other, so that the water stoppage is maintained.
In the strainer 25, a plurality of inflow holes 25c penetrating the inside and outside of the strainer 25 are formed in an intermediate portion between the insertion portions 25a and 25b. Water flows into the strainer 25 from the mass body 21 through the inflow holes 25c.

In such a strainer 25, one insertion portion 25b is a closed end closed by a closing plate 27, and the other insertion portion 25a is an open open end.
In the strainer 25, when the insertion portion 25a on the open end side is inserted into the bottom drain port 23, the water taken into the mass body 21 from the water channel 1 through the water suction port 22 flows into the strainer 25 through the inflow hole 25c, It is sent out from the bottom drainage port 23 through the insertion portion 25a on the open end side.
Further, when the insertion portion 25 b on the closed end side of the strainer 25 is inserted into the bottom drainage port 23, the bottom drainage port 23 is blocked by the blocking plate 27. Then, the drainage from the bottom drainage port 23 is blocked.

The water supplied from the bottom drain outlet 23 of the water mass 20 flows into the water supply pipe 12. A culvert pipe 13 embedded in the ground with a predetermined water gradient is connected to the water supply pipe 12.
A large number of through holes (not shown) are formed in the culvert pipe 13 so that water flowing from the water supply pipe 12 oozes out into the ground.

The groundwater level adjusting water tank 40 is connected to the downstream side of the underdrain pipe 13.
The groundwater level adjusting water tank 40 includes an outer cylinder 41, an inner cylinder 42 provided in the outer cylinder 41, and a closing cover 43 attached to the outer peripheral surface 42 f of the inner cylinder 42.

The outer cylinder 41 is cylindrical and extends in the vertical direction. The upper end of the outer cylinder 41 protrudes upward from the ground surface, and the remaining part is embedded in the ground. The outer cylinder 41 has an introduction port 44 connected to the underdrain pipe 13 and a drainage port 45 connected to the drainage pipe 14 at the bottom.
Moreover, the upper end part of the outer cylinder 41 is opening, and the cover body 47 is mounted | worn so that attachment or detachment is possible. The lid 47 is preferably connected to the outer cylinder 41 via a chain or a wire 47L in order to prevent scattering, loss, and theft.

The inner cylinder 42 is provided in the outer cylinder 41, and the lower end portion 42 b is connected to the drain port 45. As shown in FIGS. 1 and 2, the inner cylinder 42 has a plurality of through holes 46 formed at intervals in the vertical direction. Each through hole 46 is, for example, circular. The lower end portion 42b of the inner cylinder 42 has a tapered shape in which the outer diameter gradually decreases as it goes downward, so that the inner cylinder 42 is in close contact with the drainage port 45, and waterstop is maintained.
The inner cylinder 42 can be removed by pulling the lower end portion 42b upward from the drain port 45.

Further, openings 48A and 48B penetrating the inside and outside of the inner cylinder 42 are formed at the upper end portion. One first opening 48A is formed in a size that can be used as a handle when the inner cylinder 42 is lifted. The other second opening 48B is used as a locking hole for locking the inner cylinder 42 to the outer cylinder 41.
An upper portion of the inner peripheral surface of the outer cylinder 41 is made of a screw or the like, and is provided with a locking portion 49 that locks the inner cylinder 42 in a state of being removed from the drain port 45 by being inserted through the second opening 48B. Yes.

  The closing cover 43 is attached to the outer peripheral surface 42 f of the inner cylinder 42. The closing cover 43 has a cylindrical shape with a C-shaped cross-section with a part cut away in the circumferential direction. Such a closing cover 43 can be elastically deformed in the radial direction of the inner cylinder 42 with respect to the outer peripheral surface 42 f of the inner cylinder 42. As a result, the closing cover 43 is in close contact with the outer peripheral surface 42f of the inner cylinder 42 and closes the through hole 46, and is elastically deformed radially outward from the outer peripheral surface 42f of the inner cylinder 42 to expand the inner diameter. It is possible to switch between a state in which sliding movement is possible in the vertical direction along the cylinder 42. The closing cover 43 can close the plurality of through holes 46 according to the mounting position in the vertical direction with respect to the inner cylinder 42.

Further, a plurality (two in FIG. 2) of restraining bands (restraining members) 50 restraining the deformation of the closing cover 43 in the radial direction outer peripheral side are provided on the outer peripheral portion of the closing cover 43 at intervals in the vertical direction. It has been. The restraint band 50 includes a buckle portion (not shown), and can change the circumference thereof and can be fixed at an arbitrary circumference. By such a restraining band 50, the closing cover 43 is in close contact with the outer peripheral surface 42f of the inner cylinder 42 to close the through hole 46, and the vertical movement along the inner cylinder 42 is restricted and maintained in a fixed state. Can do.
Further, when the restraining band 50 is loosened, the closing cover 43 can be elastically deformed radially outward to increase the diameter, and the position adjustment of the closing cover 43 can be easily performed.

  Next, a method of using the underground irrigation system 10 as described above will be described based on the drawings.

(For field crops)
First, when performing field cropping, as shown in FIG. 1, in the water mass 20, the side drain port 24 is closed with a stop cock 26. At the bottom drain 23, the strainer 25 is set by inserting the open end side insertion portion 25a into the bottom drain 23.
Moreover, in the underground water level adjustment water tank 40, the height of the obstruction | occlusion cover 43 is adjusted beforehand according to a desired groundwater level. The groundwater level is determined according to the position of the through hole 46 exposed above the closing cover 43. For example, when all the through holes 46 are closed by the closing cover 43, the groundwater level is the same level as the upper end portion of the inner cylinder 42.

And the water sent into the underdrain pipe 13 from the bottom part drain outlet 23 of the water mass 20 oozes out into the ground from the underdrain pipe 13, and can perform irrigation. At this time, in the outer cylinder 41 of the groundwater level adjusting water tank 40, water flows into the inner cylinder 42 from the through hole 46 exposed above the closing cover 43. When all the through holes 46 are closed with the closing cover 43, the water in the outer cylinder 41 flows into the inner cylinder 42 from the upper end portion of the inner cylinder 42.
The water that has flowed into the inner cylinder 42 is discharged from the lower end portion 42 b of the inner cylinder 42 to the drainage channel 2 through the drainage port 45 and the drainage pipe 14. Thereby, the groundwater level becomes the same level as the water level in the outer cylinder 41 of the groundwater level adjusting water tank 40.

(When flushing)
In the underground irrigation system 10, grass, earth and sand, etc. flow into the underdrain pipe 13 during use. Therefore, it is preferable to perform flushing as follows at an appropriate timing.
In order to perform flushing, as shown in FIG. 3, the inner cylinder 42 is pulled upward from the drainage port 45 in the groundwater level adjustment water tank 40. At this time, the inner cylinder 42 can be easily pulled up by grasping the portion of the first opening 48A at the upper end as a handle. Then, the inner cylinder 42 pulled out from the drain port 45 causes the second opening 48B to be locked to a locking portion 49 provided on the inner peripheral surface of the outer cylinder 41. As a result, the inner cylinder 42 pulled out from the drainage port 45 can be locked to the outer cylinder 41 while being accommodated in the outer cylinder 41.
After completion of the flushing, the inner cylinder 42 is removed from the locking portion 49 and the lower end portion 42 b is inserted into the drain port 45.

(When rice cultivation)
Furthermore, when performing rice cultivation, as shown in FIG. 4, in the water mass 20, the stop cock 26 (FIG. 1) is removed from the side drain outlet 24, and the side drain outlet 24 is opened. A water supply pipe 15 is connected to the side drain port 24.
In addition, the strainer 25 is set at the bottom drainage port 23 by inserting the insertion portion 25 b on the closed end side into the bottom drainage port 23. As a result, the bottom drain port 23 is blocked by the blocking plate 27 and the drainage from the bottom drain port 23 is blocked.

  Then, the water sent from the irrigation channel 1 to the irrigation mass 20 is sent to the paddy field 3 through the side drainage port 24.

  According to the configuration as described above, the groundwater level adjusting water tank 40 adjusts the groundwater level by appropriately closing the plurality of through holes 46 by changing the position of the closing cover 43 with respect to the inner cylinder 42 in the vertical direction. be able to. When the closing cover 43 is moved in the vertical direction, the closing cover 43 is elastically deformed and spread outward in the radial direction of the inner cylinder 42. Thus, friction between the closing cover 43 and the outer peripheral surface 42f of the inner cylinder 42 can be minimized, and the closing cover 43 can be moved with a light force. Then, the closing cover 43 is brought into close contact with the outer peripheral surface 42f by being deformed radially inward by its elasticity and returning to its original shape. Therefore, the position of the closing cover 43 can be fixed securely, and water can be prevented from leaking.

Furthermore, since the outer periphery of the closing cover 43 is further provided with a restraining band 50 that restrains deformation of the closing cover 43 in the radially outer peripheral side, the closing cover 43 is brought into close contact with the outer peripheral surface 42f of the inner cylinder 42. Therefore, it is possible to prevent misalignment and reliably maintain the through hole 46 closed.
Further, the closing cover 43 has a cylindrical shape with a C-shaped cross-section with a part of the circumferential direction cut away. With this configuration, the closing cover 43 can be elastically deformed in the radial direction of the inner cylinder 42 with a simple configuration.
In this way, the groundwater level adjusting water tank 40 can easily fix the position of the closed cover 43 after the movement while easily moving the closed cover 43 with a simple configuration. Adjustment can be performed easily and reliably.

  Further, in the underground water level adjusting water tank 40, the inner cylinder 42 is detachably connected to the drain port 45. By comprising in this way, the water which flows in from the underdrain pipe 13 can be made to flow into the drain outlet 45 as it is, and the underdrain pipe 13 can be flushed.

  Further, a second opening 48B is formed at the upper end of the inner cylinder 42, and a locking portion 49 for locking the inner cylinder 42 is provided on the inner peripheral surface of the outer cylinder 41. With this configuration, the second opening 48B of the inner cylinder 42 removed from the drain port 45 is locked to the locking portion 49, and flushing is performed while the inner cylinder 42 is housed in the outer cylinder 41. Can do. Therefore, it is possible to prevent the inner cylinder 42 from being taken out of the outer cylinder 41 and accidentally damaged.

  In addition, the water mass 20 closes the bottom drainage port 23 at the time of rice cultivation, so that the water taken into the mass body 21 from the outside through the water suction port 22 passes through the water supply pipe 15 from the side drainage port 24, and the paddy field 3 Can be supplied to. Moreover, at the time of farming, if the side drainage port 24 is closed, water can be supplied into the ground through the underdrain pipe 13 from the bottom drainage port 23. In this way, a single water mass 20 can supply water to both rice cultivation and field cultivation.

And since the one insertion part 25b of the strainer 25 is made into the obstruction | occlusion end, and the other insertion part 25a is made into the open end, the water mass 20 can open | release the bottom part drain port 23 only by changing the strainer 25 up and down. Or occlusion can be switched easily.
In addition, since the strainer 25 can be easily removed from the bottom drain port 23, the strainer 25 can be easily cleaned.

(Other embodiments)
In addition, the underground water level adjustment water tank 40 of this invention is not limited to the above-mentioned embodiment described with reference to drawings, Various modifications can be considered in the technical scope.
For example, although the circular through hole 46 is formed in the inner cylinder 42, the through hole 46 may have other shapes such as a rectangular shape, a polygonal shape, and an oval shape.
Further, for example, as shown in FIGS. 5A to 5C, the through holes 46 are formed in an elliptical shape that is long in the vertical direction, and the plurality of through holes 46 are alternately provided in a staggered manner in the circumferential direction of the inner cylinder 42. May be.

Further, for example, as shown in FIGS. 6A, 6B, and 7, the closing cover 43B is rotated in the circumferential direction of the inner cylinder 42 instead of adjusting the groundwater level by moving its position up and down. By doing so, the through hole 46 may be opened and closed. In this case, one closing cover 43B is provided in each through hole 46 independently. An opening 55 is formed in the closing cover 43B. Water can be taken into the inner cylinder 42 from the through hole 46 in a state where the closing cover 43B is rotated and the opening 55 is communicated with the through hole 46.
In this embodiment, even in such a case, the closing cover 43B has a C-shaped cross section, and the outer periphery thereof is restrained using a restraining band 50 (see FIG. 1) or the like.

Further, the closing cover 43C may be made of rubber. In this case, as shown in FIG. 8, the closing cover 43C has a cylindrical shape. Further, as shown in FIG. 9, the upper and lower end portions of the cylindrical closing cover 43C are formed with projecting seal lips 56 in the circumferential direction on the inner peripheral surface thereof in order to increase the water stoppage.
Such a closing cover 43C can be easily slid in the vertical direction by being elastically deformed and expanding radially outward of the inner cylinder 42. After the closing cover 43C is moved, the closing cover 43C is brought into close contact with the outer peripheral surface 42f by contracting and deforming radially inward due to its own elasticity and returning to its original shape.

Further, in the present embodiment, the water mass 20 is provided with the strainer 25 that switches the water supply destination by reversing up and down, so that it can be used for both field farming and rice farming, but is not limited thereto.
For example, when dedicated to field cropping, as shown in FIG. 10, the water mass 20 includes at least a water inlet 22 and a bottom drain 23, and the bottom drain 23 has a cylindrical strainer having no closed end. Wear 25A.

  In the present embodiment, the stop cock 26 is provided so as to close the paddy field side opening of the side drain port 24, but is provided so as to close the water mass 20 side opening part of the side drain port 24. Also good. In this way, the water supply pipe 15 to the paddy field can always be installed at the side drain port 24.

  In addition to this, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Underground irrigation system 13 Underground pipe 14 Drain pipe 40 Groundwater level adjustment water tank 41 Outer cylinder 42 Inner cylinder 42f Outer peripheral surface 43, 43B, 43C Closure cover 44 Inlet 45 Drain outlet 46 Through hole 48A, 48B Opening 49 Locking part 50 Restraint band (restraint member)

Claims (5)

An outer cylinder that extends upward from the bottom, including an inlet connected to a culvert pipe buried in the ground and a drain outlet connected to a drain pipe,
An inner cylinder that is provided in the outer cylinder and has a lower end connected to the drain outlet and formed with a plurality of through holes in the vertical direction;
A closing cover mounted on the outer peripheral surface of the inner cylinder and capable of closing the plurality of through holes according to a mounting position in the vertical direction with respect to the inner cylinder;
The closing cover is attached to the outer peripheral surface of the inner cylinder so as to be elastically deformable in the radial direction of the inner cylinder,
A state in which the through-hole is closed in close contact with the outer peripheral surface of the inner cylinder, and a state in which the inner cylinder is elastically deformed radially outward from the outer peripheral surface of the inner cylinder and is slidable in the vertical direction along the inner cylinder. An underground water level adjusting water tank characterized by being deformable between the two.   2. The underground water level adjusting water tank according to claim 1, wherein the closing cover has a cylindrical shape with a C-shaped cross-section with a part cut in a circumferential direction.   The groundwater level adjusting water tank according to claim 1 or 2, further comprising a restraining member that is provided on an outer peripheral portion of the closing cover and restrains deformation of the closing cover toward a radially outer peripheral side.   The underground water level adjusting water tank according to any one of claims 1 to 3, wherein the inner cylinder is detachably connected to the drain port. An opening is formed on the outer peripheral surface of the upper end of the inner cylinder,
The locking part which locks in the state which removed the said inner cylinder from the said drain outlet by making the inner peripheral surface of the said outer cylinder penetrate the said opening part is provided. Water table for adjusting the groundwater level.

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