JP2008274728A - Hinged sluice gate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sluice gate capable of purifying water quality in rivers and canals with less amount of water flowing from the upstream side by utilizing the change of water level due to tide and causing no problem of the navigation of ships. <P>SOLUTION: This sluice gate formed of an upper gate 1 and a lower gate 3 moving in the upper and lower directions about a hinged shaft part 2 horizontally disposed in the sluice gate has such a function that, during a flood tide, the upper end of the upper gate 1 tilted to a river side is raised according to the rise of a sea side water level while the lower gate 3 is closed to overflow a sea side surface layer water from the upper end to a river side, and during an ebbing tide, a river side water level is maintained while the upper end is raised, and when the sea side water level is lowered and the difference between that level and the river side water level reaches a predetermined value, the lower end of the lower gate 3 is raised to a sea side to discharge the water on the river side to the sea side. The upper gate 1 is larger than the lower gate 3, and the hinged shaft part is disposed near a river bottom part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a facility for purifying water quality such as rivers, canals, and harbors by utilizing a tidal difference between tidal levels.

  Conventionally, as a method of purifying the water quality of rivers where sewage is stagnant due to the small amount of water flowing from the upstream, the amount of water flow is increased by introducing water from other rivers and pumping and discharging groundwater. A method of flushing sewage has been proposed. In addition, a method has been proposed for purifying seawater in the harbor by opening and closing a sluice gate located at the mouth of the harbor using the difference in tidal water level. (For example, see Patent Documents 1 and 2.)

  Regarding the method of introducing water from other rivers, it is not easy to allocate water to other uses by water rights such as agriculture, fishery, and industry because it takes a long time to obtain the consent of the vested right holder. In addition, the construction of the diversion channel requires a large amount of money and time for land acquisition and diversion channel construction.

  The method of pumping up and discharging groundwater may cause land subsidence due to a drop in groundwater level.

  River water that flows in from upstream flows through the surface because it has a lower density than seawater. In addition, the flow rate of water is laminar because the flow rate is small when the tides are simply dried up and down, and the lower layer water with little dissolved oxygen is stagnant, and the water quality purification is difficult. In addition to the tides, the bottom lower layer water such as canals and harbors where water does not enter and exit is stagnant and it is difficult to purify the water quality.

  Also, conventionally proposed sluices such as up / down sluice gates, horizontal gate sluice gates, and undulating gate sluice gates allow clean surface water on the sea side to flow into rivers and canals, and flow out of lower layer water such as rivers and canals. It is not easy to purify the water quality. In addition, the conventionally proposed two-stage gate such as a slide-type two-stage roller gate hinders the navigation of the ship due to the height of the gate. (For example, refer nonpatent literature 1.)

  JP-A-8-144236   JP 2006-274702 A   "Suimon Engineering" Water Engineering Environmental Disaster Prevention Technology Study Group "Suimon Engineering" Compilation Committee, published by Gihodo Publishing, Chapter 2

  In order to solve the problems of the prior art, the present invention is capable of purifying water quality of rivers, canals, harbors, and the like that are easy to maintain and manage at a low cost in a short time compared to the prior art, with a small amount of water flowing from the river. It is possible to provide a sluice that is possible and does not hinder ship navigation.

Means to solve the problem

  The present invention relates to water purification of rivers near river mouths, canals, and harbors where sewage is stagnant due to the small amount of water flowing from the river, and purifies the water quality of rivers, etc. by utilizing the difference in the water level of the tides. In order to solve the above-described technical problem, the sluice gate has the following configuration. That is, the present invention is a hinge-type gate composed of an upper gate and a lower gate that are movable in the vertical direction with a hinge shaft horizontally disposed on a sluice installed in the vicinity of an estuary where there is a difference in tide level The lower gate of the sluice is closed at the time of rising tide in a hinged gate sluice having a sea level, and the upper end of the upper gate that has been tilted to the river side is raised following the rise of the sea side water level. When the water overflows the river side and the upper end is raised at the time of tide, the river side water level is kept higher than the sea side water level, and when the sea side water level decreases and the difference from the river side water level reaches a predetermined value Water quality purification of rivers and the like is performed by a hinged gate sluice that raises the lower end of the lower gate to the sea and discharges river water to the sea.

  At the time of rising tide, the upper gate of the upper gate is tilted to the river side and tilted to allow the sea surface water to overflow the river side from the upper end, and when the river side water flows out to the sea side, the lower end of the lower gate By using a hinged gate sluice that has the function of raising the water to the sea side, the sea surface water with a large amount of dissolved oxygen and the lower layer water with less dissolved oxygen at the bottom of the river are replaced with the surface water to purify the water quality of the river.

  At the time of rising tide, the sea-side water level is higher than the river-side water level, so the height of the upper edge of the upper gate is less than or equal to the river-side water level, preferably 10 centimeters or more and not lower than the river-side water level. By flowing into the river side, the river side water level rises following the rise of the sea side water level. The position of the upper end of the upper gate is set by operating the upper gate driving device of the hinge type gate sluice according to the signal from the water level meter that measures the sea side water level and the river side water level.

  By tilting the upper end of the upper gate toward the river side from the gate hinge shaft, the surface water that is clearer than the upper end of the gate is allowed to overflow to the river side. That is, since the solid particles floating in the liquid are separated in the same manner as the inclined plate sedimentation system that is a clarification separator used in the solid-liquid separation operation of the waste water treatment, the clarified water is overflowed to the river side. As the sea level rises, the angle of inclination of the upper gate increases and the solid particles deposited on the upper gate slide down to the bottom of the sea side.

  By placing a floating material removal tool such as a grid, punching metal or wire mesh at the upper end of the upper gate, floating material floating on the water surface is prevented from flowing into the river side.

  When the inflow of water from the sea side to the river side stops at high tide, the upper end of the upper gate is raised to the highest position where the upper end is reached, and water is collected including the inflow water from upstream. The presence or absence of inflow of water from the sea side to the river side is determined by a flow meter placed at the sluice or a signal from the sea side water level meter and river side water level meter. The upper and lower gates are closed until the sea level falls from the river side water level at the time of tide and the water level difference between the river side and the sea side reaches a predetermined value. When it reaches, the lower gate is opened and the river side water is discharged to the sea side.

  The river-side water level is a numerical value obtained by adding a rise in the water level due to the inflow water from the upstream to the water level when the inflow from the sea side ceases at high tide, and the sea-side water level is a water level that has decreased due to the ebb tide. It is desirable to set the difference in water level when opening the lower gate and starting the discharge of water on the river side to the sea side to a value at which the water level on the sea side and the river side becomes equal at low tide due to the discharge. It is also effective to adjust the opening of the lower gate by increasing the water level difference in order to increase the discharge flow rate.

  The flow rate of water flowing from the river side to the sea side at the time of discharge is higher than the flow rate of water only due to the tide due to the water pressure due to the water level difference, and the river water quality is improved by discharging the lower river water by opening the lower gate. Purified. In other words, when the flow velocity is low, suspended particles in the water that cause water pollution are likely to sink downward, so the river lower water is more polluted than the river upper water. Therefore, water quality purification can be promoted by discharging the polluted river lower layer water. The river bottom is also purified by the sediment at the bottom of the river that does not flow at low flow rates due only to the tide below the buoyancy limit speed, and floats and flows out at high flow rates.

  The outflow speed of the water on the river side to the sea side is proportional to the route of the water level difference between the river side and the sea side according to Bernoulli's theorem, and increases as the water level difference increases. In addition, the amount of outflow per unit time is adjusted by the outflow speed and the opening of the lower gate, but by increasing the lower end of the lower gate to the sea instead of the river, the resistance due to contraction is reduced, so the flow rate is It becomes faster and it is easy to drain river lower water.

Since the flow rate of water flowing from the river side to the sea side at the time of discharge is greater than the flow rate of water only due to the tide due to the water pressure due to the difference in water level, the length between the lower gate lower end and the hinge axis is set between the upper gate upper end and the hinge axis. Shorter than the length, the hinge axis can be placed close to the river bottom. That is, the ship can be navigated by lowering the upper gate. In addition, the bottom of the river where the hinge-type gate sluice is installed is excavated so that it is lower than the original river bottom, and the hinge axis is placed at the same height as the original bottom of the river. Ship navigation is possible.
It is also effective to set the navigation time of the ship in advance or install a traffic signal at the sluice gate.

  The length between the upper edge of the upper gate and the hinge axis can be determined from the tide level at high tide plus river inflow water, and the length between the lower gate and the hinge axis is the difference between the water level and the water level at low tide. 50% or less. Furthermore, it is effective for navigating the ship to make the length of the lower gate and the hinge shaft 20% or less of the water level difference.

  The hinge-type gate sluice of the present invention does not need to be opened and closed twice a day, and may be opened when the ship is sailing or when water is increased due to heavy rain. In addition, the tidal range changes depending on the age, so opening and closing operations during periods close to the full tide of the full moon and new moon have a great effect on river water quality purification. It is effective for purifying river water.

  The hinge-type gate sluice of the present invention has a strength that can withstand a considerable water pressure, and a hydraulic cylinder, an electric wire rope winch system, and the like are adopted as driving devices for the upper gate and the lower gate. In addition, the contact surface with the gate of the sluice gate is smoothed, and the lower gate lower end, the gate side surface and the rotating part of the hinge are water-tightened by a rubber material such as flat rubber, P-shaped rubber and L-shaped rubber, and watertight by wood. Prevent leaks. The hinge shaft is supported by supports arranged on both sides of the sluice and on the bottom of the sluice. A known meter such as a float type may be used as the water level meter, and an electromagnetic flow meter may be used as the flow meter.

The invention's effect

  The installation location of the hinged gate sluice of the present invention is not limited to the vicinity of the river mouth, but in addition to the tides, it can be installed at the canal with little inflowing water and at the exit to the sea of the port, etc. It is possible to purify the water quality of rivers, canals and harbors without hindering navigation.

Embodiment examples of the hinged gate sluice according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a perspective view showing an embodiment of a hinged gate sluice according to the present invention.
As shown in FIG. 1, the hinge-type gate sluice according to the present invention includes an upper gate 1 and a lower gate 3 that are movable in the vertical direction with a hinge shaft 2 disposed horizontally on the sluice 8 as a fulcrum. A lattice 9 is arranged at the tip of the upper gate to prevent intrusion of floating substances. During the rising tide, the lower wire rope winches 4 and 5 are operated to keep the lower gate 3 closed, and the upper gate 1 is pulled up by the upper gate wire rope winch 6 following the rise of the sea level on the left side. When high tide stops and the flow of tide from the left sea side to the right river side stops, the upper gate is raised until it comes into contact with the upper gate stopper 7. Until the water level difference reaches a predetermined value.
When the water level difference reaches a predetermined value, the lower gate wire rope winches 4 and 5 are operated to open the lower gate to the sea side and discharge the water on the river side. After the discharge is completed, the upper gate wire rope winch 6 is loosened and the upper gate 1 is brought down to the bottom of the sluice gate by its own weight.

  FIG. 2 is a side view showing the inflow of water from the sea side to the river side during rising tide. In FIG. 2, 10 indicates the sea side water level at the time of rising tide, and 11 indicates the river side water level. As shown in FIG. 2, the lower gate 3 is closed, and the upper gate 1 is raised following the rise of the sea side water level as shown by the arrow, and the sea side surface water flows into the river side. The grid 9 at the tip of the upper gate prevents the seaside floating material from entering the river.

FIG. 3 is a side view showing the discharge of water from the river side to the sea side at the time of tide. In FIG. 3, 12 indicates the sea-side water level at the time of tide, and 13 indicates the river-side water level. As shown in FIG. 3, when the upper gate 1 is raised at high tide, when the sea-side water level 12 is lowered by the tide and the water level difference H from the river-side water level 13 reaches a predetermined value, the lower gate 3 is opened and the river side is opened. To the sea side.
Moreover, the sluice bottom part 14 is constructed so that the hinge shaft 2 is arranged at the same height as the river bottom part before the sluice is installed, so that the navigation of the ship is not hindered.

The perspective view which shows schematic structure of this invention hinge type gate sluice The side view which shows the effect | action of this invention hinge type gate sluice The side view which shows the effect | action of this invention hinge type gate sluice

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper gate 2 Hinge shaft 3 Lower gate 4 Lower gate wire rope winch 5 Lower gate wire rope winch 6 Upper gate wire rope winch 7 Upper gate stopper 8 Water gate 9 Upper gate tip lattice 10 Sea level at the time of rising tide 11 River-side water level during tidal tide 12 Sea-side water level during tidal tide 13 River-side water level during tidal tide

Claims (2)

  A sluice that purifies the water quality of rivers and canals using the water level change caused by tides. It is a hinged gate that consists of an upper gate and a lower gate that move up and down around a horizontal hinge shaft. In the constructed sluice, with the lower gate closed at the time of rising tide, the upper end of the upper gate that had been tilted to the river side is raised following the rise of the sea side water level, and the sea surface water is drawn from the upper end. Overflowing to the river side and maintaining the water level on the river side with the upper end raised at the time of tide, and when the difference between the sea side water level and the river side water level reaches a predetermined value, A hinged gate sluice that has the function of raising the river to the sea and discharging the river water to the sea.   2. The hinge-type gate sluice according to claim 1, wherein a length between the upper end of the upper gate and the hinge shaft is larger than a length between the lower end of the lower gate and the hinge shaft.

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