JP6645811B2 - Retractable water level adjustment type water lock - Google Patents

Description

  The present invention relates to a retractable water level adjustable water lock capable of adjusting the surface water level of a paddy field and the groundwater level in a field (hereinafter, collectively referred to as “water level”).

  2. Description of the Related Art Conventionally, underdrain pipes are buried under a paddy field or a field, so that excess water in the paddy field or the field is discharged to reduce cool damage and wet damage. In recent years, in order to improve the growing condition of crops, a so-called water lock has been used to control the drainage amount of culvert drainage according to the weather and the season, thereby adjusting the water level in paddy fields and fields.

  As a water lock as described above, Japanese Patent Application Laid-Open No. 2012-132252 filed by the present applicant discloses a substantially cylindrical shape that can slide and rotate with respect to the outer peripheral surface of a water stop cylinder in which a plurality of drain holes are formed. A water level adjustment type water lock provided with a rotary cylinder having an opening slit for opening drain holes at different heights according to the rotation position with respect to the water stop cylinder is disclosed (Patent Document 1). In this water lock, a rotating handle for rotating the rotating cylinder to adjust the opening slit to a desired rotation position is provided at the upper end of the rotating cylinder, and by rotating the rotating handle, the water level is properly adjusted. 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 adjusting the water level, it is necessary to have a strong arm strength to oppose the water pressure to rotate the rotating handle. It was not an easy task for workers such as women and women.

  On the other hand, in a conventional general water lock, since the opening / closing operation portion of the water stoppage cylinder is formed of a material such as vinyl chloride and is arranged so as to be exposed to the outside of the T-tube, it is exposed to wind, rain, snow and ultraviolet rays. Therefore, the environment is apt to deteriorate due to aging. Therefore, there is a need to improve durability by changing to a material having high weather resistance, while there is also a need to use an inexpensive material such as vinyl chloride.

  Furthermore, in the conventional water lock, since the upper part of the T-shaped pipe protrudes from the ridge, it may be a hindrance to walking or a mowing work.

  The present invention has been made in order to solve such a need, and can easily adjust the water level, increase the durability, and completely set aside the ridge under the ridge so as not to interfere with other operations. An object of the present invention is to provide a retractable water level-adjustable water lock which is buried in the water to improve convenience.

  A stowable water level control type water lock according to the present invention is a T-shaped pipe formed by connecting a horizontal pipe connected to a culvert drainage pipe and a vertical pipe rising upward from the horizontal pipe, and housed in the vertical pipe. Along with being formed in a substantially cylindrical shape of a size, a plurality of drain holes are formed at different height positions along the axial direction, and a valve body for shutting off drain in the horizontal pipe is provided at a lower end thereof. A water-stop cylinder provided with an opening / closing operation unit for opening and closing the valve body at the upper part thereof, and a water-stop cylinder housed in the vertical pipe and formed to be slidable up and down along the outer peripheral surface of the water-stop cylinder. A water level adjusting slide body that opens the drain holes at different heights according to a slide position with respect to the water shutoff cylinder by operating a slide operation unit provided at an upper portion, and the T-shape. In the vertical pipe of the pipe, The open / close operation section of the water blocking cylinder and the slide operation section of the water level adjusting slide are all housed, and an opening is provided at an upper portion of the vertical pipe for operating the open / close operation section and the slide operation section. A possible opening / closing lid is provided.

  Further, as one aspect of the present invention, a substantially cylindrical valve seat is fitted in the horizontal pipe of the T-shaped pipe, and the valve body of the water shutoff cylinder extends along an end face of the valve seat. The water shut-off cylinder is provided so as to be slidable in the vertical direction, so that the lower end of the valve body does not come off from the upper end of the valve seat when the water shut-off cylinder is raised to the uppermost position by the operation of the opening / closing operation unit. It may be configured.

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

  Still further, as one aspect of the present invention, a slide guide groove is formed on an inner peripheral surface of the vertical pipe along a vertical direction of the vertical pipe, and an outer peripheral surface of the valve body includes the slide guide groove. A slide projection may be formed so as to be fitted into the slide guide groove and slidable in the vertical direction.

  ADVANTAGE OF THE INVENTION According to this invention, while adjusting a water level easily, it is possible to improve durability, and to improve convenience by completely burying under a ridge so as not to disturb other works. it can.

It is a longitudinal section showing a 1st embodiment of a storage type water level adjustment type water lock concerning the present invention. It is the (a) top view and (b) side view which show the inner lid | cover in this 1st embodiment. FIG. 3A is a front view, FIG. 3B is a side view, and FIG. 3C is a cross-sectional view taken along the line 3C-3C, showing the water shutoff cylinder in the first embodiment. It is the (a) whole figure which shows the water level adjustment slide body in this 1st embodiment, and (b) is 4B-4B sectional drawing. It is a figure which shows the use state of the storage type water level adjustment type water lock of this 1st embodiment, (a) The state where none of the drain holes are open, and (b) The state which opened two drain holes from the top. FIG. It is a longitudinal section showing a 2nd embodiment of a storage type water level adjustment type water lock concerning the present invention. It is a cross-sectional view showing a T-tube in the second embodiment. It is a longitudinal section perspective view showing the T-tube in this 2nd embodiment. It is an expanded sectional view showing a valve element in a T-tube in the second embodiment. It is a figure which shows the use state of the storage type water level adjustment type water lock of this 2nd embodiment, and is a figure which shows the state which interrupts | blocks a horizontal pipe with a valve body. It is a figure which shows the use condition of the storage type water level adjustment type water lock of this 2nd embodiment, and shows the state which opened the horizontal pipe by raising a valve body.

  Hereinafter, an embodiment of a retractable water level adjusting type water lock according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 4, the retractable water level adjusting type water lock 1 </ b> A of the first embodiment mainly includes a T-shaped pipe 2 having a substantially T-shaped inverted shape and a drainage flowing through the T-shaped pipe 2. And a water level adjustment slide body 4 that can slide up and down with respect to the outer peripheral surface of the water stop cylinder 3. Hereinafter, each configuration will be described in detail.

  The T-shaped pipe 2 is connected to a culvert drainage pipe 23 buried underground in a paddy field or a field, and as shown in FIG. And a vertical pipe 22 which rises upward from the center of the vertical pipe 22. The vertical pipe 22 is communicated so as to form a substantially inverted T-shape. In the first embodiment, an underdrain drain pipe 23 communicating with the underdrain side is connected to one end on the upstream side (the right side in FIG. 1) of the horizontal pipe 21, and the other end on the downstream side (the left side in FIG. 1) is connected to the underdrain side. A drain pipe 24 leading to the drain is connected.

  In the vertical pipe 22 of the T-shaped pipe 2, the water stoppage cylinder 3 and the water level adjusting slide body 4 are completely housed up to the upper end portion. 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 35 of the opening / closing operation unit 34 provided at the upper end of the water shutoff cylinder 3 is inserted. Further, 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 section 34 and the slide operation section 42 projecting above the inner lid 25 are slid vertically.

  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 cylinder 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, rain, wind and snow. In some cases, it is a lid that opens to allow operation from above. Although the opening / closing lid 26 is formed of a synthetic resin such as vinyl chloride, the material to be used is not particularly limited, and may be appropriately selected according to the use situation.

  Next, the water stop cylinder 3 will be described. The water stop cylinder 3 serves as a valve that controls drainage flowing through the T-tube 2. Specifically, as shown in FIG. 3, the water-stop cylinder 3 is formed in a substantially cylindrical shape having a size to be housed in the vertical pipe 22, and a plurality of water-stop cylinders 3 are provided at different heights along the axial direction. A drain hole 31 is opened.

  As shown in FIGS. 1 and 3, the lower end of the water-stop cylinder 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. A ring-shaped valve body 33A for blocking drainage in the horizontal pipe 21 is provided on the periphery of the opening 32. In the first embodiment, as shown in FIG. 1, a substantially cylindrical valve seat 27 having the same outer diameter as the inner diameter of the horizontal pipe 21 is fitted.

  A guide member 28 formed in a substantially semi-circular shape along the lower half of the inner peripheral surface of the horizontal pipe 21 is provided at a position 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 surface of the valve seat 27 and slide the valve body 33A in the vertical direction.

  The lower end of the valve body 33A is fitted between the valve seat 27 and the guide member 28 in a state where the water stop cylinder 3 is lowered to the lowermost position, and abuts on the end face of the valve seat 27. To maintain a watertight condition. On the other hand, when the water stop cylinder 3 is raised to the uppermost position, the lower end of the valve body 33A is formed so as not to come off from the upper end of the valve seat 27. With these configurations, the water blocking cylinder 3 has an upper portion held by the shaft insertion hole 251 of the inner lid 25 and a lower portion abutted on the valve seat 27 to be supported. To withstand the water pressure applied to

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

  Next, the water level adjusting slide 4 will be described. The water level adjusting slide body 4 adjusts the water level by controlling the drainage height when draining water from the water blocking cylinder 3. Specifically, as shown in FIGS. 1 and 4, the water level adjusting slide body 4 includes an elongated slide portion 41 having a cross section formed in an arc shape larger than a semicircle, 41 is provided with a slide operation unit 42 for performing a slide operation in a vertical direction.

  The slide portion 41 is provided so as to cover the outer peripheral surface of the water shutoff cylinder 3 housed in the vertical pipe 22, and is attached so as to be able to slide up and down along the outer peripheral surface. As shown in FIGS. 1 and 4, the slide portion 41 has a length capable of covering all the drain holes 31 opened in the water blocking cylinder 3, and slides downward to form all the drain holes 31. Is formed to a length that allows it to be 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 stop cylinder 3, and can adjust the water level.

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

  Next, the operation of each component in the retractable water level adjusting type water lock 1A of the first embodiment will be described.

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

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

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

  In the first embodiment, since the opening / closing operation section 34 and the slide operation section 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. Change and damage can be suppressed, and weather resistance and durability are improved. Further, since the T-shaped pipe 2 is buried in the ridge A, it does not hinder the walking of the ridge A or the mowing work of the ridge A.

  On the other hand, when the open / close operation section 34 is pulled up to move the water stoppage cylinder 3 upward, the valve body 33A slides upward along the end surface of the valve seat 27. At this time, the valve body 33A is raised straight between the end face of the valve seat 27 and the guide member 28 while being guided by 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 the inner lid 25 can be smoothly moved up and down.

  Further, even when the water stop cylinder 3 is moved to the uppermost position, the lower end of the valve body 33A does not come off from the upper end of the valve seat 27, so that the upper end of the water stop cylinder 3 has a 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 described above, the following effects can be obtained.
1. The water level of a paddy field or a field can be quickly and easily adjusted even by an elderly person or a woman with weak strength.
2. Since the main structure such as the opening / closing operation section 34 is housed in the vertical pipe 22, it can be protected from ultraviolet rays, wind, rain, and snow, and weather resistance and durability can be improved.
3. Since the upper end surface of the T-shaped pipe 2 is buried in the ridge A, it does not hinder walking or mowing work, so that the convenience can be improved.

  Next, a second embodiment of the retractable water level adjusting type water lock according to the present invention will be described with reference to FIGS. Note that, among the retractable water level-adjustable water locks 1B of the second embodiment, a description that is the same as or corresponds to the configuration of the above-described first embodiment will not be repeated.

  The main feature of the retractable water level adjusting type water lock 1B of the second embodiment is that, in the configuration of the first embodiment, the valve seat 27 is formed by the valve seat groove 29 on the lower surface of the horizontal pipe 21 and the inner peripheral surface of the vertical pipe 22. With this configuration, the opening area of the horizontal pipe 21 when the valve body 33B is pulled up is increased. Hereinafter, a configuration based on this feature will be described.

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

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

  A slide guide groove 30 is formed on the inner peripheral surface of the vertical pipe 22 so that the valve body 33B guides the vertical slide along the vertical pipe 22. As shown in FIG. 7, the slide guide groove 30 in the second embodiment is formed of a pair of semicircular concave grooves in cross section.

  The valve element 33B according to the second embodiment is attached to the opening 32 of the elbow joint pipe 36 as shown in FIG. The valve body 33B is formed in a cylindrical shape having the same outer diameter as the inner diameter of the vertical pipe 22 in order to secure a watertight state with the vertical pipe 22. Further, the lower end 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 is formed. And the drained water can be allowed to flow into the space of the vertical pipe 22.

  Further, on the outer peripheral surface of the valve body 33B, in order to prevent the valve body 33B from rotating and shifting in the circumferential direction when the valve body 33B slides in the vertical direction, it is provided on the inner peripheral surface of the vertical pipe 22. A slide protrusion 37 is provided to be fitted into the slide guide groove 30. 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 the slide protrusion 37 is fitted into the slide guide groove 30.

  Next, the operation of each component in the retractable water level adjusting type water lock 1B of the second embodiment will be described.

  As shown in FIG. 10, when the water stop cylinder 3 is lowered to the lowermost 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 element 33B blocks the flow of drainage from the horizontal pipe 21. At this time, in the second embodiment, the valve seat groove 29 on the lower surface of the horizontal pipe 21 and the inner peripheral surface of the vertical pipe 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 drainage blocked by the valve 33B flows into the vertical pipe 22 through the inside of the valve 33B. Then, by operating the slide operation unit 42 to open the drain hole 31 at a desired height position, the water is drained from the drain hole 31 to the drain pipe 24 on the downstream side through the opening 32 as appropriate. . Therefore, the water level in the vertical pipe 22 is adjusted, and the water level in a paddy field or a field is adjusted.

The valve body 33B slides vertically in the vertical direction along the slide guide groove 30 provided on the inner peripheral surface of the vertical pipe 22 by the slide protrusion 37 provided on the outer peripheral surface. Therefore, even when the valve body 33B is opened and closed by the opening and closing operation part 34 at the upper part of the water stopping cylinder 3, the valve body 33B rotates in the circumferential direction and slides up and down without displacement, and the inclined opening surface 38 is inserted into the valve seat groove 29. It can be securely fitted.

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

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

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

  Note that the retractable water level-adjustable water lock 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 in parallel with the vertical pipe 22 is connected to the upstream side of the horizontal pipe 21 or the like, and a float having a floating property is arranged in the float pipe. May be provided. By providing the water level measuring means, the float moves up and down according to the water level in the vertical pipe 22 due to the drainage flowing into the float pipe 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 retractable water level control type water lock 1 has a water level measurement means for measuring the water level in the vertical pipe 22, a storage means for storing water level data suitable for a predetermined crop, and a water level adjustment for the water shutoff cylinder 3. You may add the structure which can automate water level adjustment work, such as the up-down drive means which drives the slide body 4 up and down, the control means which controls each component means.

DESCRIPTION OF SYMBOLS 1A, 1B Retractable water level adjustment type water lock 2 T-shaped pipe 3 Water stoppage pipe 4 Water level adjustment slide body 5 Plate material 21 Horizontal pipe 22 Vertical pipe 23 Underdrain drain 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 Drainage hole 32 Opening 33A, 33B Valve body 34 Opening / closing operation part 35 Shaft part 36 Elbow joint pipe 37 Slide projection 38 Inclined opening surface 41 Slide part 42 Slide operation part 251 Shaft insertion hole 252 Adjustment Operation rod insertion hole A Row

Claims (3)

A T-shaped pipe connecting a horizontal pipe connected to the culvert drain pipe and a vertical pipe rising upward from the horizontal pipe,
Along with being formed in a substantially cylindrical shape large enough to be accommodated in the vertical pipe, a plurality of drain holes are formed at different height positions along the axial direction, and drainage in the horizontal pipe is formed at the lower end thereof. A water shutoff cylinder provided with a valve body for shutting off and provided with an open / close operation unit for opening and closing the valve body above the valve body,
It is housed in the vertical pipe and is formed so as to be slidable up and down along the outer peripheral surface of the water stoppage, and varies depending on a slide position with respect to the water stoppage by operating a slide operation unit provided at an upper portion. A water level adjustment slide body that opens the drain hole at a height position,
The vertical pipe of the T-shaped pipe houses all of the opening / closing operation section of the water stoppage cylinder and the slide operation section of the water level adjustment slide body, and the upper part of the vertical pipe has the opening / closing operation section. And an opening / closing lid that can be opened to operate the slide operation unit is provided ,
A substantially cylindrical valve seat is fitted in the horizontal pipe of the T-shaped pipe, and the valve body of the water shutoff cylinder is provided so as to be slidable vertically along an end face of the valve seat. And
A retractable water level adjusting water lock , wherein the water shutoff cylinder is configured such that a lower end of the valve body does not come off from an upper end of the valve seat when the water shutoff cylinder is raised to an uppermost position by operating the opening / closing operation unit . A T-shaped pipe connecting a horizontal pipe connected to the culvert drain pipe and a vertical pipe rising upward from the horizontal pipe,
Along with being formed in a substantially cylindrical shape sized to be accommodated in the vertical pipe, a plurality of drain holes are formed at different height positions along the axial direction, and drainage in the horizontal pipe is formed at the lower end thereof. A water shutoff cylinder provided with a valve body for shutting off and provided with an open / close operation unit for opening and closing the valve body above the valve body,
It is housed in the vertical pipe and is formed so as to be slidable up and down along the outer peripheral surface of the water stoppage, and varies depending on a slide position with respect to the water stoppage by operating a slide operation unit provided at an upper portion. A water level adjustment slide body that opens the drain hole at a height position,
The vertical pipe of the T-shaped pipe houses all of the opening / closing operation section of the water stoppage cylinder and the slide operation section of the water level adjustment slide body, and the upper part of the vertical pipe has the opening / closing operation section. And an opening / closing lid that can be opened to operate the slide operation unit is provided,
On the lower surface of the horizontal pipe, a valve seat groove formed in a semicircular shape along the inner peripheral surface on the downstream side of the vertical pipe in plan view is opened, and the valve at the lower end of the water shutoff cylinder is opened. body, the vertical pipe formed on the inside and a cylindrical shape having the same outer diameter, and its lower end is an inclined opening surface fittable along the valve seat groove, retractable level-adjusted water閘. A sliding guide groove is formed on the inner peripheral surface of the vertical pipe along the up-down direction of the vertical pipe, and the outer peripheral surface of the valve body is fitted in the sliding guide groove to extend in the up-down direction. 3. The retractable water level adjusting type water lock according to claim 2 , wherein a slide projection which can slide is formed on the water lock.

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