JP2016166521A - Housing-type water level adjusting lock gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing-type water level adjusting lock gate that enables water level adjustment to be made readily, enhances durability, and is buried completely under a furrow so as not to interfere with other work and therefore enhances convenience.SOLUTION: A housing-type water level adjusting lock gate includes: a T-shaped pipe 2 made by connecting a horizontal pipe 21 and a vertical pipe 22; a water cutoff pipe 3 having a plurality of drainage holes 31 formed in an axial direction, a valve body 33 provided at a lower edge part, and an opening/closing operation part 34 provided at a top part; and a water level adjustment sliding body 4 formed to be slidable in a vertical direction along an outer peripheral surface of the water cutoff pipe 3, and opening the drainage hole 31 when a slide operation part 42 is operated. The opening/closing operation part 34 and the slide operation part 42 are entirely housed in the vertical pipe 22 of the T-shaped pipe 2. An openable lid 26 is provided at a top part of the vertical pipe 22, for operating the opening/closing operation part 34 and the slide operation part 42.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a storage-type water level adjustment type water tank capable of adjusting the water level of a paddy field and a groundwater level in a farm field (hereinafter collectively referred to as “water level”).

  Conventionally, underground drainage pipes have been buried underground in paddy fields and fields, and excess damage from paddy fields and fields is discharged to reduce cold damage and wet damage. In recent years, in order to improve the growth situation of crops, so-called water tanks have been used to control the amount of drainage of underdrainage according to the weather and season and adjust the water level in paddy fields and fields.

  Japanese Patent Application Laid-Open No. 2012-132252 filed by the applicant of the present application as a water tank as described above has a substantially cylindrical shape that is slidable and rotatable with respect to the outer peripheral surface of a waterstop cylinder in which a plurality of drain holes are formed. There is disclosed a water level adjustment type water tank provided with a rotating cylinder having an open slit that opens drain holes at different height positions depending on the rotating position with respect to the water stopping cylinder (Patent Document 1). In this water tank, a rotating handle for rotating the rotating cylinder to adjust the opening slit to a desired rotating position is provided at the upper end of the rotating cylinder, and the water level is adjusted appropriately by rotating the rotating handle. be able to.

JP 2012-132252 A

  However, in the invention described in Patent Document 1, since a large water pressure is applied to the open slit when the water level is adjusted, a strong arm force that can resist the water pressure is required to rotate the rotary handle. It was not an easy task for workers such as women and women.

  On the other hand, in the conventional general water tank, the opening / closing operation part of the waterstop is made of a material such as vinyl chloride and is exposed to the outside of the T-shaped tube, so that it is exposed to wind, rain, snow and ultraviolet rays. Therefore, it is in an environment that easily deteriorates over time. Accordingly, there is a need to change to a highly weather-resistant material to improve durability, and there is also a need to use an inexpensive material such as vinyl chloride.

  Furthermore, since the upper part of the T-shaped tube protrudes from the ridge in the conventional water tank, there are cases where it interferes with walking or hinders mowing work.

  The present invention has been made to solve these needs, and can easily adjust the water level, enhance durability, and completely under the armpit so as not to interfere with other operations. The purpose is to provide a storage-type water level adjustment type water tank which is embedded in the container and improves convenience.

  A storage-type water level adjustment type water tank according to the present invention is a T-shaped pipe formed by communicating a horizontal pipe connected to a culvert drain pipe and a vertical pipe raised upward from the horizontal pipe, and is stored in the vertical pipe. A plurality of drainage holes are formed at different height positions along the axial direction, and a valve body for blocking drainage in the horizontal pipe is formed at the lower end of the drainage hole. A waterstop cylinder provided with an opening / closing operation unit for opening and closing the valve body at an upper portion thereof, and formed in the vertical pipe so as to be slidable vertically along the outer peripheral surface of the waterstop cylinder. And a water level adjusting slide body that opens the drainage hole at different height positions according to the slide position with respect to the water blocking tube by operating a slide operation portion provided at the upper portion, and the T-shape. In the vertical pipe of the pipe, The opening / closing operation portion of the water stop and the slide operation portion of the water level adjusting slide body are all housed, and an opening for operating the opening / closing operation portion and the slide operation portion is provided above the vertical pipe. A possible opening / closing lid is provided.

  Moreover, as one aspect of the present invention, a valve seat formed in a substantially cylindrical shape is fitted in the horizontal tube of the T-shaped tube, and the valve body of the waterstop tube extends along an end surface of the valve seat. The water stop cylinder is provided so that the lower end portion of the valve body does not come off from the upper end portion of the valve seat when the water stop cylinder is raised to the uppermost position by the operation of the opening / closing operation portion. It may be configured.

  Furthermore, as one aspect of the present invention, a valve seat groove formed in a semicircular arc shape along the inner peripheral surface on the downstream side of the vertical tube in a plan view is opened on the lower surface of the horizontal tube, The valve body at the lower end portion of the waterstop cylinder is formed in a cylindrical shape having the same outer diameter as the inner diameter of the vertical pipe, and the lower end portion has an inclined opening surface that can be fitted along the valve seat groove. It may be.

  Furthermore, as one aspect of the present invention, a slide guide groove is formed on the inner peripheral surface of the vertical pipe along the vertical direction of the vertical pipe, and the outer peripheral surface of the valve body has the Sliding projections may be formed that are fitted in the sliding guide grooves and are slidable in the vertical direction.

  According to the present invention, it is possible to easily adjust the water level, enhance durability, and improve the convenience by being completely buried under the heel so as not to interfere with other operations. it can.

It is a longitudinal cross-sectional view which shows 1st embodiment of the storage type water level adjustment type water tank which concerns on this invention. It is the (a) top view and (b) side view which show the inner lid in this 1st embodiment. It is the (a) front view, (b) side view, and (c) 3C-3C sectional view taken on the line which show the waterstop cylinder in this 1st embodiment. It is the (a) whole view and (b) 4B-4B sectional view taken on the line which show the water level adjustment slide body in this 1st embodiment. It is a figure which shows the use condition of the storage-type water level adjustment type water tank of this 1st embodiment, Comprising: (a) The state which none of the drain holes are open, and (b) The state which opened two drain holes from the top FIG. It is a longitudinal cross-sectional view which shows 2nd embodiment of the storage type water level adjustment type water tank which concerns on this invention. It is a cross-sectional view showing a T-shaped tube in the second embodiment. It is a longitudinal cross-sectional perspective view which shows the T-tube in this 2nd embodiment. It is an expanded sectional view which shows the valve body in the T-shaped tube in this 2nd embodiment. It is a figure which shows the use condition of the storage-type water level adjustment type water tank of this 2nd embodiment, Comprising: It is a figure which shows the state which has interrupted the horizontal pipe with the valve body. It is a figure which shows the use condition of the storage-type water level adjustment type water tank of this 2nd embodiment, Comprising: It is a figure which shows the state which raised the valve body and opened the horizontal pipe.

  Hereinafter, an embodiment of a storage-type water level adjustment type water tank according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 4, the storage-type water level adjustment type water tank 1 </ b> A according to the first embodiment mainly includes a T-shaped tube 2 in which a substantially T-shape is arranged upside down, and drainage flowing through the T-shaped tube 2. And a water level adjusting slide body 4 slidable up and down with respect to the outer peripheral surface of the water stopping tube 3. Hereinafter, each configuration will be described in detail.

  The T-shaped pipe 2 is connected to a culvert drain pipe 23 buried underground in a paddy field or a farm field. As shown in FIG. 1, a horizontal pipe 21 arranged in a substantially horizontal direction, and the horizontal pipe 21. And a vertical tube 22 that rises upward from the center thereof, and communicates so as to form an inverted T-shape. In the first embodiment, a culvert drain pipe 23 leading to the culvert side is connected to one end (the right side in FIG. 1) of the horizontal tube 21 and the other end (the left side in FIG. 1) on the downstream side. A drain pipe 24 leading to the drain channel is connected.

  In the vertical tube 22 of the T-shaped tube 2, the water stop tube 3 and the water level adjusting slide body 4 are completely stored up to the upper end portion, and at the midpoint in the longitudinal direction, the inside of the inner wall to prevent dirt and foreign matter from entering. A lid 25 is provided. Specifically, as shown in FIG. 2, the inner lid 25 is formed with a shaft insertion hole 251 through which the shaft portion 35 of the opening / closing operation portion 34 provided at the upper end portion of the water blocking tube 3 is inserted. In addition, an adjustment operation rod insertion hole 252 through which the slide operation portion 42 of the water level adjustment slide body 4 is inserted is formed. The opening / closing operation unit 34 and the slide operation unit 42 protruding above the inner lid 25 are slid in the vertical direction.

  An openable / closable lid 26 is provided at the upper end of the vertical tube 22. The opening / closing lid 26 needs to be operated while protecting the opening / closing operation part 34 of the water blocking tube 3 and the slide operation part 42 of the water level adjusting slide body 4 housed in the vertical pipe 22 from ultraviolet rays, wind and rain, and wind and snow. In this case, it is a lid that can be opened and operated from above. The opening / closing lid 26 is made of a synthetic resin such as vinyl chloride, but the material used is not particularly limited, and may be appropriately selected according to the usage situation.

  Next, the waterstop cylinder 3 will be described. The waterstop cylinder 3 serves as a valve for controlling the drainage flowing through the T-tube 2. Specifically, as shown in FIG. 3, the waterstop 3 is formed in a substantially cylindrical shape having a size accommodated in the vertical tube 22, and a plurality of waterstops 3 are provided at different height positions along the axial direction. A drain hole 31 is opened.

  Further, as shown in FIGS. 1 and 3, the lower end portion of the waterstop tube 3 is attached with an elbow joint pipe 36 and is bent 90 degrees downstream, and a circular opening 32 is formed toward the downstream side. It is open. In addition, a ring-shaped valve element 33 </ b> A that blocks the drainage in the horizontal tube 21 is provided at the periphery of the opening 32. Further, in the first embodiment, as shown in FIG. 1, a valve seat 27 formed in a substantially cylindrical shape having the same outer diameter as the inner diameter of the horizontal tube 21 is fitted.

  Further, a guide member 28 formed in a substantially semi-circular shape along the lower half of the inner peripheral surface of the horizontal tube 21 is located upstream of the end face of the valve seat 27 by the thickness of the valve body 33A. Is provided. The guide member 28 is configured to guide the valve body 33A between the end face of the valve seat 27 and slide it in the vertical direction.

  The lower end portion of the valve body 33A is fitted between the valve seat 27 and the guide member 28 in a state where the water blocking cylinder 3 is lowered to the lowest position, and comes into contact with the end surface of the valve seat 27. The watertight state is maintained. On the other hand, the lower end of the valve body 33A is formed so as not to be disengaged from the upper end of the valve seat 27 when the waterstop 3 is raised to the uppermost position. With these configurations, the water blocking cylinder 3 is supported by the upper portion being held by the shaft insertion hole 251 of the inner lid 25 and the lower portion being in contact with the valve seat 27, so that the valve body 33 </ b> A is supported. It is designed to withstand the water pressure applied.

  Further, as shown in FIGS. 1 and 3, an opening / closing operation portion 34 for opening and closing the valve body 33 </ b> A by moving the water stopping tube 3 up and down is provided at the upper end portion of the water stopping tube 3. The opening / closing operation unit 34 is inserted into the shaft insertion hole 251 of the inner lid 25. Further, the shaft portion 35 of the opening / closing operation portion 34 is provided with a fixing member 27 for fixing to the inner lid 25. The shaft portion 35 of the opening / closing operation portion 34 is fixed at the raised position, and The valve body 33A is held in an open state.

  Next, the water level adjusting slide body 4 will be described. The water level adjusting slide 4 adjusts the water level by controlling the height of drainage when draining from the waterstop cylinder 3. Specifically, as shown in FIGS. 1 and 4, the water level adjusting slide body 4 includes a long slide portion 41 having a cross-sectional shape formed in a dominant arc shape larger than a semicircle, and the slide portion. 41 has a slide operation part 42 for performing a slide operation in the vertical direction.

  The slide portion 41 is provided so as to cover the outer peripheral surface of the waterstop cylinder 3 accommodated in the vertical pipe 22, and is attached to be slidable up and down along the outer peripheral surface. Further, as shown in FIGS. 1 and 4, the slide portion 41 has a length that can cover all the drain holes 31 opened in the water blocking cylinder 3, and slides downward so as to cover all the drain holes 31. Is formed in such a length that is opened. Therefore, the water level adjusting slide body 4 can open and close the drain hole 31 having a desired height in accordance with the vertical position with respect to the water blocking cylinder 3, and the water level can be adjusted.

  As shown in FIGS. 1 and 4, the slide operation unit 42 is fixed to the outer peripheral side surface of the slide unit 41 and is inserted through the adjustment operation rod insertion hole 252 of the inner lid 25. With this configuration, the slide operation part 42 protrudes upward from the inner lid 25, and the slide part 41 is slid up and down above the inner lid 25.

  Below, the effect | action of each structure in 1 A of storage-type water level adjustment type water tanks of this 1st embodiment is demonstrated.

  As shown in FIG. 5, the retractable water level adjustment type water tank 1 </ b> A of the first embodiment is embedded so that the upper end surface of the T-shaped tube 2 is hidden under the water bottle A. Then, when adjusting the water level of the paddy field and the groundwater level of the field, the opening / closing lid 26 provided at the upper end of the T-shaped tube 2 is opened, and the opening / closing operation unit 34 is moved up and down to move the waterstop cylinder 3 up and down. Slide to adjust the water level. For example, when the waterstop 3 is lowered, the valve body 33A is brought into contact with the valve seat 27 in the horizontal tube 21 while being guided by the guide member 28. Thereby, the valve body 33 </ b> A stops drainage from the underdrain drain pipe 23. As shown in FIG. 5 (a), when the slide portion 41 of the water level adjusting slide body 4 closes all the drain holes 31, the dammed drainage flows into the space of the vertical pipe 22, It is pushed up to the same height as the water level of paddy fields and fields by atmospheric pressure.

  Next, the slide operation part 42 is operated, the slide part 41 is slid up and down with respect to the water stop cylinder 3, and the drain hole 31 in a desired height position is opened. For example, as shown in FIG. 5B, when the slide operation unit 42 is operated and the slide unit 41 is pushed downward to open the drainage holes 31 up to the top two, the space in the vertical tube 22 is filled. The drainage that has been discharged overflows into the waterstop cylinder 3, is discharged from the opening 32 of the waterstop cylinder 3, and is discharged to the downstream side of the horizontal pipe 21. Therefore, the water level of a paddy field or a field falls to a position corresponding to the height of the drainage hole 31 that is opened.

  As described above, in the first embodiment, the water level can be adjusted by simply sliding the water level adjusting slide body 4 up and down. Therefore, the water level adjustment work is simple, and even an elderly person or a woman with weak arm strength can quickly The water level can be adjusted. Therefore, since the amount of drainage that can be controlled by one storage-type water level adjustment type water tank 1A is increased and a large water reduction depth is secured, the water level of paddy fields and fields can be adjusted quickly according to changes in climate, temperature, etc. Yield and quality can be improved. Moreover, since the number of installation of the storage-type water level adjustment type water tank 1A can be reduced by increasing the amount of drainage, management work in a large-scale paddy field or field is simplified.

  In the first embodiment, since the opening / closing operation unit 34 and the slide operation unit 42 are housed in the vertical tube 22 and are closed by the opening / closing lid 26, they are not exposed to ultraviolet rays, wind and rain, and wind and snow. Changes and damage can be suppressed, and weather resistance and durability are improved. Further, since the T-shaped tube 2 is embedded in the reed A, it does not get in the way when walking along the reed A or performing a mowing work on the reed A.

  On the other hand, when the open / close operation unit 34 is pulled upward to move the water blocking cylinder 3 upward, the valve element 33 </ b> A slides upward along the end surface of the valve seat 27. At this time, the valve element 33 </ b> A is lifted straight while being guided by the guide member 28 between the end face of the valve seat 27 and the guide member 28. Therefore, the friction between the shaft insertion hole 251 and the adjustment operation rod insertion hole 252 of the inner lid 25 is small, and it can be moved up and down smoothly.

  Further, even if the waterstop 3 is moved to the uppermost position, the lower end of the valve element 33A does not come off from the upper end of the valve seat 27, so that the upper portion of the waterstop 3 is the shaft insertion hole 251 of the inner lid 25. And the lower part is supported by the valve seat 27. Therefore, since the water stop cylinder 3 can maintain a straight state, the load does not concentrate on the shaft insertion hole 251 and can withstand the water pressure applied to the valve body 33A.

According to the first embodiment as described above, the following effects can be obtained.
1. Even elderly people and women with weak arm strength can quickly and easily adjust the water level in paddy fields and fields.
2. Since the main structure such as the opening / closing operation unit 34 is accommodated in the vertical tube 22, it can be protected from ultraviolet rays, wind and rain, and snow and snow, and weather resistance and durability can be improved.
3. Since the upper end surface of the T-shaped tube 2 is embedded in the ridge A, it is possible to improve convenience without interfering with walking or mowing work.

  Next, a second embodiment of a retractable water level adjusting water tank according to the present invention will be described with reference to FIGS. In addition, about the structure which is equivalent to the structure of 1st embodiment mentioned above among the storage-type water level adjustment type water tanks 1B of this 2nd embodiment, description for the second time is abbreviate | omitted.

  The main features of the retractable water level adjustment type water tank 1B of the second embodiment are that the valve seat 27 is the valve seat groove 29 on the lower surface of the horizontal tube 21 and the inner peripheral surface of the vertical tube 22 in the configuration of the first embodiment. This is because the opening area of the horizontal tube 21 when the valve body 33B is pulled up is widened. Hereinafter, a configuration based on this feature will be described.

  The valve seat 27 in the second embodiment includes a valve seat groove 29 formed on the inner peripheral surface of the vertical tube 22 and the lower surface of the horizontal tube 21.

  As shown in FIG. 6, the valve seat groove 29 is a concave groove provided on the lower surface of the horizontal tube 21, and as shown in FIG. 7, the downstream side of the horizontal tube 21 in plan view (left side in FIG. 6). Is opened in a semicircular arc shape along the inner peripheral surface. Thereby, as shown in FIG. 8, the valve seat groove 29 is inclined obliquely in a side view. The valve seat groove 29 in the second embodiment is drilled in a semicircular arc shape so as to penetrate the lower surface of the horizontal tube 21 by a machine tool or the like, and the outside of the formed semicircular arc hole is covered with the plate material 5. Is formed.

  A slide guide groove 30 is formed on the inner peripheral surface of the vertical tube 22 to guide the valve body 33B to slide in the vertical direction along the vertical tube 22. As shown in FIG. 7, the slide guide groove 30 in the second embodiment includes a pair of semicircular concave grooves.

  The valve body 33B in the second embodiment is attached to the opening 32 of the elbow joint pipe 36 as shown in FIG. The valve body 33 </ b> B is formed in a cylindrical shape having the same outer diameter as the inner diameter of the vertical pipe 22 in order to ensure a watertight state with the vertical pipe 22. Further, the lower end portion of the valve body 33B has an inclined opening surface 38 that can be fitted along the valve seat groove 29, and the inclined opening surface 38 is fitted into the valve seat groove 29, so that the upstream side The drainage from the water is stopped, and the stopped water can flow into the space of the vertical pipe 22.

  Further, an outer peripheral surface of the valve body 33B is provided on the inner peripheral surface of the vertical pipe 22 in order to prevent the valve body 33B from rotating and shifting in the circumferential direction when the valve body 33B is slid in the vertical direction. A slide projection 37 to be fitted into the slide guide groove 30 is provided. The slide projection 37 in the second embodiment is formed in a semicircular convex shape that matches the slide guide groove 30 in order to ensure a watertight state when fitted into the slide guide groove 30.

  Below, the effect | action of each structure in the storage type water level adjustment type water tank 1B of this 2nd embodiment is demonstrated.

  As shown in FIG. 10, when the waterstop 3 is lowered to the lowest position, the valve body 33 </ b> B is formed to have the same diameter as the valve seat groove 29 and the inner peripheral surface of the vertical pipe 22. 29 and the vertical pipe 22 are watertight. Therefore, the valve body 33B blocks the flow of the drainage of the horizontal pipe 21. At this time, in the second embodiment, the valve seat groove 29 on the lower surface of the horizontal tube 21 and the inner peripheral surface of the vertical tube 22 become the valve seat 27.

  Further, since the inclined opening surface 38 is formed in an oblique shape, the upstream side is opened. Therefore, the waste water blocked by the valve body 33B flows into the vertical pipe 22 through the valve body 33B. Then, by operating the slide operation part 42 to open the drain hole 31 at a desired height, the drain hole 31 is appropriately drained from the drain hole 31 to the downstream drain pipe 24 through the opening 32. . Therefore, the water level in the vertical pipe 22 is adjusted, and the water level in a paddy field or a field is adjusted.

Further, the valve body 33B slides straight in the vertical direction along the slide guide groove 30 provided on the inner peripheral surface of the vertical tube 22 by the slide projection 37 provided on the outer peripheral surface. Therefore, the valve body 33B rotates in the circumferential direction and slides up and down without shifting its position even when the valve body 33B is opened / closed by the opening / closing operation unit 34 at the upper part of the waterstop cylinder 3, and the inclined opening surface 38 is formed in the valve seat groove 29 Can be securely fitted.

  Further, the valve element 33B, the valve seat groove 29, and the vertical pipe 22 surface are always in contact with each other, and the water pressure received by the water blocking tube 3 is supported by the contact surface. Therefore, the force due to the water pressure is dispersed in the contact surface and the shaft insertion hole 251 to prevent the valve body 33B and the waterstop cylinder 3 from being damaged.

  Next, as shown in FIG. 11, when the waterstop cylinder 3 is raised to the uppermost position, the horizontal tube 21 is in a state where the entire inner diameter is opened. Therefore, the opening area becomes larger than that in the case of using the substantially cylindrical valve seat 27 fitted into the horizontal tube 21 as in the first embodiment, and the drainage from the horizontal tube 21 is performed more quickly. .

  According to the second embodiment as described above, the same effect as that of the first embodiment can be obtained, and the inner peripheral surface of the vertical tube 22 and the valve seat groove 29 can be used as the valve seat 27. . Further, by bringing the valve body 33B and the inner peripheral surface of the vertical pipe 22 and the valve seat groove 29 into surface contact, the proof strength of the valve body 33B and the waterstop cylinder 3 against water pressure can be improved. Furthermore, by smoothing the drainage when the waterstop cylinder 3 is raised, the water level of the paddy field or the field can be lowered quickly.

  In addition, the storage-type water level adjustment type water tank according to the present invention is not limited to the above-described embodiments, and can be appropriately changed.

  For example, although not shown, a water level measuring means in which a float pipe raised substantially parallel to the vertical pipe 22 is communicated with the upstream side of the horizontal pipe 21 and the like, and a floatable float is disposed in the float pipe. May be provided. By providing this water level measurement means, the float moves up and down according to the water level in the vertical pipe 22 by the drainage that flows into the float pipe up to the water level of the paddy field or the field, so that the water level can be measured, The water level can be adjusted accurately.

  Although not shown, the water level adjustment means for measuring the water level in the vertical pipe 22, the storage means for storing the water level data suitable for a predetermined crop, the water level adjustment for the water stop cylinder 3, You may add the structure which can automate water level adjustment work, such as the vertical drive means which drives the slide body 4 up and down, and the control means which controls each structure means.

DESCRIPTION OF SYMBOLS 1A, 1B Reservation type water level adjustment type water tank 2 T-shaped pipe 3 Water stop cylinder 4 Water level adjustment slide body 5 Plate material 21 Horizontal pipe 22 Vertical pipe 23 Underdrain pipe 24 Drain pipe 25 Inner lid 26 Opening / closing lid 27 Valve seat 28 Guide member 29 Valve Seat groove 30 Slide guide groove 31 Drain hole 32 Opening 33A, 33B Valve body 34 Opening / closing operation part 35 Shaft part 36 Elbow joint pipe 37 Protrusion for slide 38 Inclined opening surface 41 Slide part 42 Slide operation part 251 Shaft insertion hole 252 Adjustment Operation rod insertion hole A 畦

Claims (4)

A T-shaped pipe formed by communicating a horizontal pipe connected to the underdrain pipe and a vertical pipe raised upward from the horizontal pipe;
A plurality of drainage holes are formed at different heights along the axial direction, and the drainage in the horizontal pipes is formed at the lower end of the cylinder. A waterstop cylinder provided with a valve body for shutting off and provided with an opening / closing operation part for opening and closing the valve body at an upper part thereof;
It is housed in the vertical pipe and is formed to be slidable up and down along the outer peripheral surface of the waterstop cylinder, and varies depending on the slide position with respect to the waterstop cylinder by operating a slide operation section provided at the top. A water level adjusting slide that opens the drainage hole at a height position,
The vertical tube of the T-shaped tube accommodates the open / close operation unit of the waterstop cylinder and the slide operation unit of the water level adjusting slide body, and the open / close operation unit is disposed above the vertical tube. And a retractable water level adjustment type water tank provided with an openable / closable lid for operating the slide operation section. A valve seat formed in a substantially cylindrical shape is fitted in the horizontal tube of the T-shaped tube, and the valve body of the waterstop cylinder is provided so as to be slidable in the vertical direction along the end surface of the valve seat. And
2. The storage according to claim 1, wherein the waterstop is configured so that a lower end portion of the valve body does not come off from an upper end portion of the valve seat when the water stop tube is raised to an uppermost position by an operation of the opening / closing operation unit. Water level adjustment type water tank.   A valve seat groove formed in a semicircular arc shape along the inner peripheral surface on the downstream side of the vertical pipe in a plan view is opened on the lower surface of the horizontal pipe, and the valve at the lower end of the waterstop cylinder is opened. 2. The body according to claim 1, wherein the body is formed in a cylindrical shape having the same outer diameter as the inner diameter of the vertical pipe, and the lower end portion thereof has an inclined opening surface that can be fitted along the valve seat groove. Retractable water level adjustment type water tank.   A slide guide groove is formed on the inner peripheral surface of the vertical pipe along the vertical direction of the vertical pipe, and the valve body is fitted in the slide guide groove on the outer peripheral surface of the vertical pipe in the vertical direction. The storage-type water level adjustment type water tank according to claim 3, wherein a sliding projection that can slide is formed.

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