JPS6229120Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mooring device for a floating aerator used to supply dissolved oxygen to wastewater or the like.

Aerators are mainly used for activated sludge treatment of organic wastewater, and floating aerators in particular are widely used because they automatically follow fluctuations in water level and can operate continuously. These floating aerators float to the surface of the water due to the buoyancy of the float, but if left as they are, they will move horizontally on their own due to the reaction force during aeration and the wind pressure from outside air, and the cable that feeds power from the ground to the aerator motor will be affected. If stress is generated and a disconnection accident occurs, or if the aeration tank is moved to a lopsided position, the supply of dissolved oxygen is not diffused throughout the tank and becomes partial, resulting in a decrease in treatment performance. Conventionally, to prevent these,
Three to four ropes are attached around the aerator at approximately equal intervals, and one end of each rope is attached to a stake or concrete wall of the aeration tank, with slack that allows the aerator to respond to changes in water level. A method of mooring was used by tying to fixing metal fittings embedded in the ground. This method is generally widely used in the case of normal-scale activated sludge treatment, that is, in the range where the side length of the aeration tank is several tens of meters or less, because it has a simple structure and is easy to operate.

However, recently, due to water pollution in sea areas and lakes, the amount of dissolved oxygen in the water has decreased, endangering the habitat of fish, and causing complaints from nearby residents due to bad odors. In addition, when household waste is incinerated and the ash dust is used to fill a sea area, the incinerated ash dust is dumped in a sea area that has been separated from the open ocean, but in this case too, pollution such as bad odors is generated due to a decrease in dissolved oxygen in the water. It is expected that.

In such cases, using an aerator to supply dissolved oxygen into the water is effective for maintaining water quality, and floating aerators are particularly suitable in sea areas where the tide level changes. Furthermore, in the case of reclaiming the sea area, even if it is separated from the open ocean, changes in the tide level of the open ocean will cause seawater to seep in and out from underground, causing fluctuations in the water level, so a floating aerator is suitable. When the distance to the opposite shore is several hundred meters, the conventional method of pulling a rope from the aerator to the opposite shore and fixing it is difficult because the rope becomes long and sagging, which increases its weight and causes the aerator float to become sluggish. This method has been difficult to put into practical use because of the disadvantages that the buoyancy must be increased to cope with the problem, and that the aerator may overturn due to the unbalanced force that the aerator receives from each rope due to the influence of wind and waves.

The object of the present invention is to eliminate the above-mentioned drawbacks when a floating aerator is used in a wide body of water, and to provide a device that can be stably moored while responding to fluctuations in water level.

The present invention will be described below with reference to an embodiment shown in FIGS. 1 and 2. In FIG. 1, an aerator 1 is connected to a buoy 3 via a rope 7.
The buoy 3 floats on the water surface and is moored to a sinker 4 on the bottom of the water by a rope 5 and a chain (stat chain) 6. The chain body 6 is commonly called a stud chain, and is constructed by interconnecting ring bodies having a considerable weight, such as iron materials. The weight of the buoy constantly applies a tensile force toward the sinker 4 to the buoy 3 via the rope 5. The cab tire cable 2 is for supplying power to the aerator motor, and is supported by buoys 8 at appropriate intervals and connected to a shore power source. FIG. 2 is a plan view of FIG. 1, but around the aerator there is a mooring section consisting of three sets of the aforementioned components, and the three buoys are connected to each other by ropes 9.

Next, how each component operates according to the configuration described above will be explained. The sinker 4 installed on the bottom of the water should have sufficient weight so that even in the event of a typhoon, the aerator 1, buoy 3, ropes 7, 9
etc., resist the force exerted by wind and waves and hold their position. The stud chain 6 having a suitable unit weight is attached to the buoy 3 via the rope 5 due to its own weight.
Try to sink it diagonally in the direction of the sinker, that is, toward the bottom of the water. The length of the stat chain 6 is predetermined according to fluctuations in the water level, and is set to a length that does not lose its force to sink the buoy 3 as described above even at the lowest water level. Buoy 3 is connected to the above-mentioned stat chain 6
Its role is to convert the force caused by the force into a component force in the horizontal direction. In other words, the force exerted by the stat chain 6 that tends to cause the body to sink diagonally downward is divided into a horizontal component and a vertical component toward the bottom, and the horizontal component is canceled out by its own buoyancy. Only the force remains, and that force is transmitted to the aerator 1 through the rope 7. Aerator 1 as shown in Figure 2
If there are three sets of mooring devices around the buoy, the aerator 1 will be pulled horizontally by each buoy 3, and the aerator will come to rest at the center where the forces are balanced. The buoy 3 has sufficient buoyancy to resist the weight of the stat chain 6 and not sink even at the highest water level. The ropes 9 connecting the buoys 3 to each other also serve to maintain the relative position of the buoys and to stabilize the pulling force on the aerator 1.

Figure 3 shows a case where the water level A in Figure 1 has decreased to B, but in this case, the stat chain 6 sinks as the water level decreases, and a part of it reaches the bottom of the water and goes to the buoy. Although the tensile force of the buoy is somewhat weakened, the weight of the remaining portion is applied to the buoy 3, so that the mooring force to the aerator 1 is maintained. In other words, if you investigate the maximum amount of change in water level in advance, use a stat chain of an appropriate length, and utilize its own weight, the aerator can be moored in a fixed position regardless of fluctuations in water level. Can be done.

In addition, when the water level decreases, the stud chain 6 becomes slack, so if it receives a strong external force F, such as a wind with a wind speed of 10 m or more, it will drift in the direction of the external force F, as shown in Figure 4. , a horizontal component force F ₁ is applied to the buoy 3 on the left side in the figure due to the dead weight of the stat chain 6, which is larger than a horizontal component force F ₂ on the buoy 3 on the right side in the figure. Therefore, when the external force F weakens, this component force F ₁ causes the aerator to
receives a restoring force and is moored to its original position. In this way, the aerator 1 can always be moored at a substantially constant position, and a stable flapping effect can be obtained even against waves, wind, etc.

FIG. 5 shows an embodiment in which a plurality of aerators are installed, and the arrangement of the aerators is rationally configured and the number of sinkers is reduced. Further, as shown in the figure, it is also possible to use the above-mentioned method according to the present invention and the conventional mooring method together for an aerator installed in a body of water near the shore.

As explained above, according to the present invention, it is easy to utilize the features of floating aerators in wide sea areas such as inland seas and lakes, and it is rational that floating aerators can be used to maintain water quality from a wider perspective than before. A typical aerator mooring device can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the aerator mooring device according to the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a view showing the state when the water level is lowered in Fig. 1, and Fig. 4 5 is a diagram showing the relationship between the floating state of the aerator and the restoring force when the water level drops, and FIG. 5 is a plan view showing another embodiment of the present invention. 1... Aerator, 2... Cab tire cable, 3... Buoy, 4... Sinking weight, 5, 7, 9, 12
... Rope, 6 ... Stud chain, 8 ... Buoy for cab tire cable, 10 ... Bottom of water, 11
... quay, 13... pile.

Claims (1)

[Scope of utility model registration request] Buoys floating on the water surface are provided at the tips of multiple ropes extending radially from the floating aerator and are connected to each other by ropes, and buoys are connected to each other by ropes extending from the aerator on the respective extension lines of the ropes extending from the aerator. sinkers installed on the bottom of the water that are outward from the buoy when viewed from above, and a chain that is installed between these sinkers and the corresponding buoy and constantly applies a tensile force to the buoy toward the sinker by its own weight. Aerator mooring device equipped with.