JP2012233803A - Pressure type water level measuring device and removing method of deposits in breakwater pipe by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure type water level measuring device that can reliably open and close a bottom cover disposed at a breakwater pipe bottom portion from a position above a water level and facilitates opening/closing operation of the bottom cover by removing sediment deposited at a lower portion of a breakwater pipe.SOLUTION: A pressure type water level measuring device comprises: a breakwater pipe 4 installed by submerging a lower end portion thereof below a water surface; a pressure type water level meter 5 disposed through the breakwater pipe 4; a bottom cover 6 through which a through-hole 7 is formed while being detachably disposed at a lower end opening 4a of the breakwater pipe 4; an operating rod 10 that is coupled to the bottom cover 6, is displaced integrally with the bottom cover 6 and is disposed extending along the breakwater pipe 4 in substantially parallel thereto to above the water surface; and an operating section 11 for operating the operating rod 10. The operating rod 10 is made to be displaceable in an axis direction and a circumferential direction by operation by means of the operating section 11. Jet nozzles 25 for ejecting water supplied through an inner portion of the operating rod 10 are disposed at a portion positioned below the bottom cover 6 of the operating rod 10.

Description

  The present invention accommodates a pressure-type water level gauge used for water level measurement of rivers, dams, etc., inside a wave breaker, and is provided with a bottom lid in which a through hole is formed at the lower end opening of the wave breaker. The present invention relates to a pressure-type water level measuring device and a method for removing deposits in a breakwater tube using the same.

  One of the devices that measure the water level of rivers and dams is a pressure type water level measuring device that installs a pressure type water level meter in the liquid to measure the liquid level by detecting the liquid pressure. This is done by installing a cylindrical pipe called a wave breaker so that its lower end is inserted below the surface of the water, inserting a pressure-type water gauge inside this wave-break pipe, It is installed so as to be located below the water level where the water level is lowered and above the lower end opening of the breaker tube (see Patent Documents 1 and 2).

  Such a pressure type water level measuring device can be installed at a low cost and a small space compared to a float type water level measuring device (see Patent Document 3). When the water level fluctuation is transmitted to the inside of the wave breaker, the water level indication sensed by the pressure type water level gauge varies, so the bottom opening of the wave breaker is closed with a bottom lid as shown in FIG. By opening a small-diameter through hole in the lid, it is possible to suppress the transmission of small fluctuations in the water level within the wave-breaking tube.

JP 2008-128688 A Japanese Patent No. 3234970 JP 2007-78561 A

However, as shown in FIG. 5, if the through hole 7 is formed in the bottom lid 6 provided in the lower end opening 4 a of the wave breaker 4 in which the pressure type water level gauge 5 is accommodated, the through hole 7 Since there are a lot of floating materials such as sediment in the water along with the flowing water, the floating materials that have entered through the through holes 7 accumulate on the upper surface of the bottom cover of the wave breaker 4, and the through holes 7 are blocked by the deposit α. There is an inconvenience that the accurate water level cannot be measured.
For this reason, in the conventional pressure-type water level measuring device, water is cut off in dams and waterways, the bottom cover of the bottom of the wave breaker tube is opened, and the work inside the wave breaker tube is removed. It took a lot of work, and it took a lot of time and effort.

  In order to avoid such inconvenience, as shown in Patent Document 3 described above, an opening / closing lid for opening and closing the cylindrical body is provided at the opening at the lower end of the cylindrical body, and the opening / closing lid is rotated around the hinge. It is possible to connect the wire to the end opposite to the hinge and remotely control it through the wire. However, the bottom lid unwinds the wire and opens it around the hinge by its own weight. For this reason, there is an inconvenience that the opening operation of the bottom lid becomes impossible when earth and sand are accumulated below the wave breaker during the opening / closing operation.

  The present invention has been made in view of such circumstances, and in a pressure-type water level measurement device in which a pressure-type water level meter is inserted into a wave breaker tube, a bottom lid provided on the bottom of the wave breaker tube is positioned above the water level. The main object is to provide a pressure-type water level measuring device that can be reliably opened and closed. Another object of the present invention is to make it easier to open and close the bottom lid by removing the earth and sand below the wave breaker even when the lower end of the wave breaker is buried with earth and sand.

  In order to achieve the above object, a pressure-type water level measuring apparatus according to the present invention includes a wave breaker installed with a lower end inserted under the water surface, and a pressure water level gauge inserted into the wave breaker. And a bottom lid that is detachably provided in the opening at the lower end of the wave breaker and has a through hole, and is connected to the bottom lid and displaced integrally with the bottom lid, along the wave breaker And an operation bar provided above the water surface of the operation bar and operating the operation bar. The operation bar is operated by the operation unit. It can be displaced in the axial direction and circumferential direction.

  Therefore, the bottom cover detachably provided in the opening at the lower end of the wave breaker can be displaced in the axial direction and the circumferential direction by operating the operating rod that is displaced integrally therewith. It is possible to directly transmit the movement of the operation unit in the axial direction and the circumferential direction to the bottom cover, and the bottom cover can be moved according to the operation of the operation unit. For this reason, even if sediment has accumulated below the bottom lid, it can be removed to some extent by pushing down or rotating the bottom lid, and the opening and closing operation of the bottom lid can be accurately performed. Can be done.

Moreover, the pressure type water level measuring device described above further extends the operating rod below the bottom cover attached to the lower end of the wave preventing tube, and guides water supplied from the outside to the lower end of the operating rod. A water guide channel may be formed, and a jet nozzle for jetting water supplied through the water guide channel may be provided at a position located below the bottom cover of the operation rod.
According to such a configuration, even when the movement of the bottom lid by the operation unit is hindered by the earth and sand below the bottom lid, the earth and sand accumulated below the wave breaker are blown away by the water ejected from the ejection nozzle. It becomes possible to remove, and it is possible to make the movement of the bottom lid by the operation unit more reliable.

  Note that a plurality of the ejection nozzles are disposed in the axial direction of the operation rod and a plurality in the circumferential direction of the operation rod at a portion below the bottom cover of the operation rod, It is preferable to eject water in a direction substantially perpendicular to the axis of the rod. By setting it as such a structure, it becomes possible to remove the earth and sand collected under the wave-proof tube over a wide range.

  Further, the ejection nozzle may be provided at the lower end of the operation rod so that water is ejected downward in the axial direction of the operation rod. By adopting such a configuration, it is possible to remove the earth and sand collected immediately below the operation rod and to ensure smooth movement of the operation rod.

Further, the bottom cover may be formed in a tapered shape in which the upper surface thereof is lowered downward toward the periphery with the central portion as a top portion, and the through hole is preferably formed in the central portion in the axial direction.
According to such a configuration, since the upper surface of the bottom cover is formed in a taper shape, when the bottom cover is removed from the wave breaker, floating substances accumulated on the top surface of the bottom cover are removed from the bottom cover. Since the distance of the through holes can be made relatively long, it is possible to reduce earth and sand entering the wave breaker.

Here, the operation unit is provided on the operation panel, the operation lever coupled to the operation rod, the operation panel formed with a guide hole for moving the operation lever up and down or horizontally on a predetermined locus, and the operation lever. You may make it comprise with the stopper which can control a motion of this.
According to such a configuration, the operation lever only has to be slid along the guide hole along a predetermined locus, so that there is no error in operation and the movement of the operation lever can be regulated by the stopper. Therefore, it is possible to hold the operation lever at the set position, and it is possible to prevent the position of the bottom cover from becoming unstable.

  The guide hole provided in the operation panel includes a shaft hole formed along the axial direction of the operation rod, and a peripheral hole connected to the lower end of the shaft hole and formed along the circumferential direction of the operation rod. As a structure to be formed, the movement of the bottom lid is ensured by securing a predetermined movement of the bottom lid as two steps of an operation for displacing the bottom lid in the axial direction of the wave breaker and an operation for displacing the bottom lid in the circumferential direction. In addition to being able to stabilize, it is easy to adjust the installation location of the breakwater tube in anticipation of the trajectory of the bottom cover.

  As described above, the pressure-type water level measuring apparatus according to the present invention is configured to operate the operating rod that is integrally displaced by connecting the bottom lid detachably provided at the opening at the lower end of the wave preventing tube. Since it can be displaced in the axial direction and the circumferential direction, it is possible to directly transmit the operation in the axial direction and the circumferential direction by the operation unit to the bottom cover, and the bottom cover can be moved according to the operation of the operation unit. Therefore, it is possible to accurately perform the opening / closing operation of the bottom lid.

  In addition, the operation rod is extended below the lower end of the breaker tube to form a water conduit for guiding the water supplied from the outside to the lower end inside the operation rod, and below the bottom lid of this operation rod. Even if the movement of the bottom cover by the operation unit is hindered by earth and sand etc. below the bottom cover by providing the discharge nozzle at the position where it is located, it is accumulated below the breakwater tube by the water discharged from the discharge nozzle It becomes possible to remove earth and sand, and it is possible to ensure a reliable movement of the bottom lid by the operation unit.

  If a plurality of ejection nozzles are arranged in the axial direction of the operation rod and also in the circumferential direction of the operation rod at a portion located below the bottom cover of the operation rod, the prevention is prevented. It becomes possible to remove the sediment accumulated below the wave tube over a wide range. In addition, if a jet nozzle is also provided at the lower end of the operating rod so that water is ejected downward in the axial direction of the operating rod, the sediment collected just under the operating rod is removed and the operating rod moves smoothly. Can be secured.

  Moreover, by forming the upper surface of the bottom lid in a tapered shape that falls downward toward the periphery, it becomes easier to remove the suspended matter accumulated on the upper surface of the bottom lid from the top surface of the bottom lid. By forming the through hole to be formed in the central portion in the axial direction, the distance of the through hole can be made relatively long, and it is possible to reduce earth and sand entering the breaker tube.

  Furthermore, the operation unit is provided on the operation panel, an operation lever coupled to the operation rod, an operation panel formed with a guide hole for moving the operation lever up and down or horizontally on a predetermined locus, and the operation lever. By having a stopper that can restrict movement, the operation lever can be slid along the guide hole along a predetermined path, and there is no mistake in operation. Can be held at the set position, so that the position of the bottom lid can be prevented from becoming unstable.

  The guide hole provided in the operation panel includes a shaft hole formed along the axial direction of the operation rod, and a peripheral hole connected to the lower end of the shaft hole and formed along the circumferential direction of the operation rod. As a structure to be formed, the movement of the bottom lid is ensured by securing a predetermined movement of the bottom lid as two steps of an operation for displacing the bottom lid in the axial direction of the wave breaker and an operation for displacing the bottom lid in the circumferential direction. In addition to being stable, it is easy to adjust the installation location of the wave breaker in anticipation of the movement path of the bottom lid.

FIG. 1 is a diagram showing an overall configuration of a pressure-type water level measuring apparatus according to the present invention. FIG. 2 is a view of the pressure-type water level measuring device of FIG. 1 as seen from line AA. FIG. 3 is a view showing an operation portion of the pressure-type water level measuring device according to the present invention, and FIG. 3 (a) is a view showing an operation lever position in a state where the bottom cover is attached to the lower end opening of the wave breaker. There is a state in which the position of the operation lever is regulated so as not to move in the vertical direction by the stopper 15, and (b) shows that the bottom lid is removed downward from the lower end opening of the wave breaker and is rotated in the circumferential direction. It is a figure which shows the operation lever position in the made state, and shows the state where the position of the operation lever is regulated by the stopper 16 so as not to move in the circumferential direction. FIG. 4 is an explanatory diagram for explaining that the bottom lid that rotates integrally with the operation rod is displaced by displacing the operation lever. FIG. 4A is a schematic diagram showing the relationship between the bottom lid and the operation lever. FIG. 4B is an explanatory diagram for explaining the operation of lowering and rotating the bottom lid. FIG. 5 is a diagram illustrating the configuration of a conventional pressure-type water level measuring device.

  Hereinafter, an embodiment of a pressure type water level measuring device according to the present invention will be described with reference to the accompanying drawings.

  In FIG. 1, a pressure-type water level measuring device 1 is, for example, a cylinder in which a lower end portion is inserted below a water surface in the vicinity of a side wall 2 such as a dam or a river and is installed at a predetermined position on the side wall 2 via a fixture 3. A wave breaker 4 is provided. The wave breaker 4 is set so that the position of the open upper end is positioned higher than the expected highest water level, and the position of the lower end is positioned lower than the expected lowest water level. Is set.

  A pressure-type water level gauge 5 is inserted and accommodated in the breaker tube 4 from the upper end opening. The pressure-type water level gauge 5 is positioned below the water level at which the water level is most lowered, and is also protected. It is installed so as to be located above the lower end opening 4 a of the wave tube 4.

  A bottom cover 6 that can be attached and detached is provided at the lower end of the breaker tube 4. A small-diameter through hole 7 is formed in the bottom cover 6, and water in the breaker tube passes through this through hole 7. Inflow or outflow only through

  In this example, the bottom cover 6 is made of a synthetic resin, and includes a base portion 6a applied to the lower end of the breaker tube 4 and a sealing portion 6b integrally formed on the upper surface of the base portion 6a. The upper surface of the sealing part 6b is formed in a tapered shape that descends downward from the central part toward the periphery, and the through-hole 7 is formed in the axial direction at the thickest central part. As a result, even if the water surface outside the wave breaker fluctuates in small increments, the water surface in the wave breaker tube is not easily transmitted into the wave breaker, and the water level does not fluctuate in small increments.

  In the vicinity of such a breaker tube 4, an operation rod 10 is provided that is arranged substantially in parallel along the breaker tube 4. This operation rod 10 is composed of a metal material, a synthetic resin, etc. that is resistant to corrosion and has an upper end that extends to above the water surface and a lower end that extends below the lower end of the wave preventing tube 4. In the vicinity of the lower part, it is connected to the base 6 a of the bottom cover 6 and is displaced together with the bottom cover 6.

  The upper end of the operation rod 10 extending upward from the water surface is bent at a substantially right angle, and the operation rod 10 can be manually operated on the upper portion of the vertical portion extending upward from the water surface. An operation unit 11 is provided. The operation unit 11 includes an operation lever 12 coupled to the operation rod 10, an operation panel 14 formed with a guide hole 13 for moving the operation lever 12 up and down or horizontally on a predetermined locus, and an operation panel 14. In this embodiment, the guide hole 13 provided in the operation panel 14 extends along the axial direction of the operation rod 10. The stoppers 15 and 16 are provided to restrict the movement of the operation lever 12. And a peripheral hole 13b formed along the circumferential direction of the operation rod 10, and the operation lever 12 is connected to the operation hole 12 via the guide hole 13. It protrudes from the operation panel 14 and can be displaced only along the guide hole 13 in the axial direction and the circumferential direction.

  The stopper 15 is provided in the vicinity of the tip of the shaft hole 13a (the end opposite to the side connected to the peripheral hole 13b), and the stopper 16 is connected to the tip of the peripheral hole 13b (the shaft hole 13a). Near the end on the opposite side).

  Therefore, in the normal time when the opening and closing of the bottom cover 6 is not required, the operation lever 12 is moved to the upper end of the guide hole 13 (so that the bottom cover 6 closes the lower end opening 4a of the wave preventing tube 4). The movement in the axial direction is restricted by the stopper 15 so as to be held at the upper end of the shaft hole) (see FIG. 3A). Further, in the state where the bottom cover 6 is removed from the lower end opening 4a of the breaker tube 4 and fully opened, the movement in the circumferential direction is regulated by the stopper 16 so that the fully opened state is maintained. (See FIG. 3B).

  By the way, the inside of the operation rod 10 is formed hollow, and a water conduit 20 is formed to guide water from one end above the water surface to the other end of the water. One end above the water surface is, for example, a fire hose. A joint portion 23 for connecting a joint portion 22 provided at the tip of 21 is formed.

Further, in a portion extending below the lower end of the breaker tube 4 of the operating rod 10, that is, below the bottom cover 6, water is perpendicular to the axis of the operating rod 10 (in the radial direction). A plurality of jet nozzles 25 for jetting are received. A plurality (four in this example) of the ejection nozzles 25 are arranged at a predetermined interval in the axial direction of the operation rod 10 and at a predetermined interval (a central angle of 30 degrees in the circumferential direction of the operation rod 10). A plurality of nozzles that inject toward the axial center of the breaker tube 4 and two nozzles arranged at predetermined intervals on both sides around the nozzle. 3) are arranged.
A jet nozzle 25 is also provided at the lower end of the operating rod 10 to inject water downward along the axis of the operating rod 10.

  These ejection nozzles 25 are connected to a water conduit 20 formed inside the operation rod 10. Therefore, the joint portion 22 of the fire hose 21 is connected to the joint portion 23 of the operation rod 10 so that water is introduced into the water conduit. When supplied to 20, this water is guided to the tip of the operating rod 10 through the water conduit 20 and is pumped to the lower periphery of the bottom cover 6 and also to the lower portion of the operating rod 10. It has become.

  Therefore, in the above configuration, the bottom cover 6 that is detachably provided at the lower end opening 4a of the wave breaker 4 is operated by operating the operating rod 10 that is displaced integrally with the bottom lid 6 so that the operating force is reduced. Since the bottom cover 6 can be directly transmitted to the bottom cover 6 and displaced in the axial direction and the circumferential direction, the bottom cover 6 can be moved in accordance with the operation of the operation lever 12.

  For this reason, when deposits such as earth and sand are accumulated on the bottom lid 6 in the state where the deposits are removed, the stoppers 15 and 16 are removed and positioned at the upper end of the shaft hole 13a. The operating lever 12 is held by hand, moved downward along the shaft hole 13a, and pushed down to the intersection with the peripheral hole 12b. As a result, the operating rod 10 is pushed down, and the bottom lid 6 that is displaced integrally therewith is removed from the lower end opening 4 a of the wave breaker 4 and lowered downward. Thereafter, if the operating lever 12 is slid along the peripheral hole 13b to the tip thereof, the operating rod 10 rotates about its own axis, and the bottom lid 6 that is displaced integrally with the operating rod 10 is also It rotates about the axis of the operating rod 10 by the same angle as the operating lever 12.

  As a result, the upper surface of the bottom cover 6 is exposed to a water flow such as a dam or a water channel, and deposits accumulated on the top of the bottom cover 6 are swept around the bottom cover 6 by a water flow such as a dam or a water channel. It can be removed by the impact when moving. At this time, in order to maintain the state where the bottom cover 6 is exposed to the water flow, it is preferable to attach the removed stopper 16 to restrict the movement of the operation lever 12 in the circumferential direction.

  Thereafter, to return the bottom cover 6 to its original position (when the bottom cover 6 is attached to the lower end portion of the wave breaker 4), the stopper 16 is removed, the movement restriction of the operation lever 12 is released, and the operation is performed. The lever 12 is moved along the peripheral hole 13b to the intersection with the shaft hole 13a. As a result, the operating rod 10 rotates about its own axis, and the bottom cover 6 that is displaced integrally with the operating rod 10 also moves to a position directly below the breaker tube 4. Thereafter, if the operating lever 12 is moved upward along the shaft hole 13 a, the operating rod 10 is displaced upward, and the bottom cover 6, which is displaced integrally with the operating rod 10, is moved to the lower end opening 4 a of the breaker tube 4. It is attached and the lower end of the breakwater tube 4 is closed to return to the original state during normal use.

  For this reason, even when the earth and sand are accumulated below the bottom cover 6, the bottom cover 6 can be pushed down or rotated by operating the operation lever 12. By the movement, the earth and sand below the bottom cover can be removed to some extent, and the opening / closing operation of the bottom cover 6 can be performed accurately.

  Further, even when it is difficult to move the bottom lid 6 due to earth or sand accumulated around the bottom lid 6 or when the movement of the bottom lid 6 is hindered by the earth and sand below the bottom lid 6, the water is prevented by the water ejected from the ejection nozzle 25. It becomes possible to blow away and remove the sediment accumulated below the pipe 4, and it is possible to more reliably operate the movement of the bottom lid 6 by the operation unit 11.

  That is, a plurality of the ejection nozzles 25 are disposed in the axial direction of the operation rod 10 in the portion below the bottom cover 6 of the operation rod 10 and are also disposed in the circumferential direction of the operation rod 10. By removing the sediment accumulated below the breaker tube over a wide range, it is possible to ensure the smooth movement of the bottom cover 6, and the ejection nozzle 25 is also provided at the lower end of the operation rod 10. Therefore, the earth and sand immediately below the operation rod 10 can be removed, and the smooth movement of the operation rod 10 can be ensured.

  Further, since the bottom surface of the bottom cover 6 is tapered such that the top surface thereof is the center portion and descends toward the periphery, the top surface of the bottom cover 6 is removed when the bottom cover 6 is removed from the wave breaker tube 4. It becomes easy to remove the deposit α deposited on the bottom lid 6 from above.

  Furthermore, since the operation lever 12 has only to be slid along the guide hole 13 according to a predetermined locus, there is no mistake in operation and no unnecessary movement is involved in the operation. Moreover, the guide hole 13 provided in the operation panel 14 is connected to the shaft hole 13a formed along the axial direction of the operation rod 10 and the lower end of the shaft hole 13a, and formed along the circumferential direction of the operation rod 10. An L-shape formed from the peripheral hole 13b is formed, and has two stages: an operation for displacing the bottom cover 6 in the axial direction of the wave-breaking tube 4 and an operation for displacing the bottom cover 6 in the circumferential direction. Therefore, by ensuring a predetermined movement of the bottom cover 6, the movement of the bottom cover 6 can be stabilized, and the installation position of the wave breaker 4 can be easily adjusted in anticipation of the movable range of the bottom cover 6. Can be performed.

  Furthermore, since the operation lever 12 can restrict the movement of the operation lever 12 by the stoppers 15 and 16, the operation lever 12 can be held at a predetermined setting position, and the position of the bottom lid 6 becomes unstable. It becomes possible to avoid becoming.

  In the above-described configuration, the example in which four ejection nozzles 25 are provided at equal intervals in the axial direction and three in the circumferential direction on the circumferential surface of the operation rod 10 is shown. However, the present invention is not limited to this configuration. Instead, the arrangement of the ejection nozzles 25 may be adjusted as appropriate in order to ensure the movement of the bottom cover 6. In this example, the operation unit 11 has a configuration in which an operation lever 12 for operating the movement of the bottom lid 6 is provided. However, a hose that supplies water to the joint unit 23 of the operation rod 10 is always connected. The water supplied to the distal end portion of the water conduit 20 may be supplied or stopped by opening / closing an unillustrated on-off valve provided in the operation unit 11.

DESCRIPTION OF SYMBOLS 1 Pressure type water level measuring device 4 Wave breaker 5 Pressure type water level meter 6 Bottom cover 7 Through hole 10 Operation rod 11 Operation part 12 Operation lever 13 Guide hole 13a Shaft hole 13b Circumferential hole 14 Operation panel 15,16 Stopper 20 Water guide channel 25 Jet nozzle

Claims (9)

A wave breaker installed with its lower end inserted below the water surface;
A pressure-type water level gauge inserted into the inside of the wave breaker,
A bottom lid that is detachably provided in the opening at the lower end of the wave breaker and has a through hole;
An operating rod connected to the bottom lid and integrally displaced with the bottom lid, and extending substantially parallel to the wave barrier tube from above the water surface,
An operation unit that is provided above the water surface of the operation rod and operates the operation rod;
With
The pressure type water level measuring device according to claim 1, wherein the operating rod is displaceable in an axial direction and a circumferential direction by an operation by the operation unit. The operation rod extends below the bottom lid,
A water conduit that guides water supplied from the outside to the lower end is formed inside the operation rod, and water supplied through the water conduit is ejected to a portion located below the bottom cover of the operation rod. The pressure type water level measuring device according to claim 1, wherein a jet nozzle is provided.   A plurality of the ejection nozzles are disposed in the axial direction of the operation rod and in the circumferential direction of the operation rod at a portion below the bottom cover of the operation rod, The pressure-type water level measuring apparatus according to claim 2, wherein water is ejected in a direction substantially perpendicular to the axis.   The pressure type water level measuring device according to claim 3, wherein the ejection nozzle is also provided at a lower end of the operation rod and ejects water downward in the axial direction of the operation rod.   The said bottom cover is formed in the taper shape which falls below as it goes to a periphery with a center site | part as a top part, The said through-hole is formed in the said center site | part in the axial direction. The pressure type water level measuring device according to any one of the above.   The operation unit is provided on the operation panel, an operation panel coupled to the operation bar, an operation panel formed with a guide hole for moving the operation lever up and down or horizontally on a predetermined locus, and the operation panel. The pressure type water level measuring device according to claim 1, further comprising a stopper capable of regulating the movement of the lever.   The guide hole provided in the operation panel includes a shaft hole formed along the axial direction of the operation rod, and a peripheral hole connected to the lower end of the shaft hole and formed along the circumferential direction of the operation rod. The pressure type water level measuring device according to claim 6, wherein A method for removing deposits in a breakwater tube using the pressure-type water level measuring device according to claim 1,
Operate the operation portion downward (moving the operation lever downward) and displace the bottom cover by displacing it downward from the lower end portion of the wave preventing tube, and then operate the operation rod in the circumferential direction. A bottom lid removing step of shifting the axis of the bottom lid from the axis of the wave breaker tube by rotating the bottom lid around the operation rod (by moving the operation lever in the circumferential direction);
In a state where the bottom cover is detached from the breaker tube, the operation unit is operated in the circumferential direction (the operation lever is moved in the circumferential direction) and the axis of the bottom cover and the axis of the breaker tube are And then operating the operating rod upward (moving the operating lever upward) to attach the bottom lid to the lower end portion of the wave breaker. A method for removing deposits in a breakwater tube. When it is difficult to move the bottom cover downward from the lower end of the wave breaker by operating the operation part downward (moving the operation lever downward), the water guide channel is moved from the ejection nozzle. 9. The method of removing deposits in a breakwater tube according to claim 8, wherein water supplied through the jet is jetted.

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