JP3312426B2 - River sand removal equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing sand deposited on a river.

[0002]

2. Description of the Related Art Sand that accumulates in a river to form a sand bar or the like has a problem that the flow passage area of the river is reduced and a disaster such as a flood occurs.

Recently, as a sand discharging device for efficiently removing such sedimentary sand, as shown in FIGS.
Inside, a plurality of bags 20 that can be raised and lowered in one direction are installed so that the longitudinal direction thereof is along the flow of the water of the river, and fluid supply / discharge means 21 is connected to each of the bags 20. Each bag 2
There has been proposed a device in which 0 is freely expanded or contracted.

In this apparatus, when sand accumulates around each raised bag 20, the raised bag 20 is laid down below the surface of the water to form a water channel, and the sediment is deposited by the force of the river water flowing into the water channel. I'm trying to wash away.

[0005]

However, as described above, in the method of depositing sand around the undulating bags 20 provided along the flow of the river, the distance 22 between the undulating bags 20 is large.
It is necessary to set an appropriate size so that the sand is settled while the water of the river flows therebetween and the sand is efficiently deposited. However, since the appropriate size of the interval 22 is determined by conditions such as the flow path area of the river, the flow rate of the water, and the flow velocity, it is necessary to set the interval relatively strictly, and the setting operation is troublesome. There's a problem.

Further, in the method of depositing sand on the surface of the undulating bag 20 along the flow of the river, it is impossible to predict in which position and in what state the sand will be deposited on the undulating bag 20. Therefore, there is a problem that the accumulation position and the discharge direction of the sand cannot be accurately specified.

Accordingly, an object of the present invention is to provide a sand discharging device which does not require strict setting of the interval between the undulating bags, and which can accurately control the sand accumulation position.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of undulating bags which are long in one direction and are spaced apart from each other in a river. It placed so as to substantially along the further between undulations bag adjacent
An auxiliary bag capable of raising and lowering river water flowing into the water is provided, and a fluid supply / discharge means is connected to the raising and lowering bag and the auxiliary bag, respectively.

[0009]

In the above structure, when sand is deposited, the undulating bag and the auxiliary bag are set inside the river with both standing upright. As a result, the auxiliary bag acts to dam the flow of the river, and sand accumulates on the front side of the auxiliary bag.

When the sand accumulates around the undulating bag, the fluid is drained from the undulating bag and the auxiliary bag to make them fall down together, and both of them sink below the water surface. As a result, a water flow path is formed in the portion of the undulated undulation bag, and sedimentary sand is washed down by river water flowing into the flow path.

[0011]

1 to 7 show an embodiment of the present invention. In the figure, reference numeral 1 denotes a river, and a plurality of undulating main bags 3 are installed at an outlet of the river 1 at predetermined intervals from a river bank 2. Each main bag 3 is formed in a shape that is long in one direction, and is provided so that its longitudinal direction is substantially along the flow of water in the river (the direction indicated by the arrow in the figure).

An auxiliary bag 4 is provided between the main bags 3 and between the main bag 3 and the riverbank 2 so as to cross the flow of water in the river 1, respectively. Each of the auxiliary bags 4 is provided on the side of each of the main bags 3 so as to be located rearward with respect to the flow of the river.

As shown in FIG. 4, the main bag 3 and the auxiliary bag 4 form a concrete base 5 on the riverbed.
The rubberized cloth 6 formed in a bag shape is anchored on the anchor bolt 7
And fixedly attached.

The rubberized cloth 6 forming the main bag 3 and the auxiliary bag 4 is formed by laminating several layers of nylon cloth on chloroprene-based rubber or synthetic rubber having weather resistance and abrasion resistance equal to or higher than that. A cushion member 8 is attached inside the cushion member 8 to prevent damage to the main body due to impact. When a fluid such as air or water is introduced into the rubber cloth 6, the bag expands and the bag rises. Conversely, when the fluid is removed from the inside, the bag contracts and falls down. In this case, the main bag 3
In the standing state, the upper end slightly protrudes from the water surface of the river as shown in FIG.
As shown in FIG. 7, the whole bag sinks below the water surface, and is brought into a state of being pressed on the base 5 by water pressure. On the other hand, auxiliary bag 4
Is sunk below the water surface of the river in an upright state, and is pressed on the base 5 by water pressure in the laid state in the same manner as the main bag 3.

At the bottoms of the main bag 3 and the auxiliary bag 4, as shown in FIGS. 3 and 4, a supply / discharge port 9 for a fluid such as air or water is formed. Supply / exhaust pipes 10 and 11 connected to an operation room 12 installed on the ground are connected. In addition, the operation room 12 and each main bag 3 and each auxiliary bag 4
Between the operation chamber 12 and the main bag 3 on the near side, an upstream water level detection pipe 14 is provided. And a control device for controlling the supply and discharge and supply amount of the fluid based on the detected internal pressure and water level.

The sand discharging device of this embodiment has the above-described configuration, and its operation will be described below. When sand is deposited, fluid is introduced into each main bag 3 and each auxiliary bag 4 to expand the sand as shown in FIGS. 2 and 3, and each main bag 3 and each auxiliary bag 4 are erected inside the river 1. Place. Thereby, each main bag 3
Since the water of the river flowing in between is blocked by the auxiliary bags 4, sand is deposited on the front side of each auxiliary bag to form a sand bar as shown in FIG.

When sand accumulates between the main bags 3 in this manner, fluid is discharged from the inside of each main bag 3 and the auxiliary bag 4 to simultaneously contract each bag, and as shown in FIGS. 6 and 7, Each bag 3, 4 is laid down on the riverbed base 5. As a result, a water channel 15 is formed in the part of the main bag 3 that has fallen, so that the river 1
Of water flows into the channel 15 in a concentrated manner, and the sedimentary sand around the channel 15 is sequentially flushed toward the sea.

When the sand is discharged from the river 1 as described above, the fluid is again supplied to the main bag 3 and the auxiliary bag 4 to stand up, and the above-described operations from the accumulation of the sand to the discharge thereof are repeated.

The auxiliary bag 4 may be provided at any position between the main bags 3, and may be provided at a certain distance behind the rear end of the main bag 3. You may.

[0020]

As described above, according to the present invention, the auxiliary bag is provided on the side of the undulating bag along the flow of the river, and the auxiliary bag dams the water of the river to deposit sand. Sand can be reliably deposited without strictly setting the intervals between the undulating bags. Further, since the sand accumulation position can be specified by the auxiliary bag, there is an advantage that the accumulation state and the discharge direction of the sand can be accurately controlled.

[Brief description of the drawings]

FIG. 1 is a plan view showing an entire sand discharging device according to an embodiment.

FIG. 2 is a longitudinal sectional view along the longitudinal body of the undulating bag.

FIG. 3 is a cross-sectional view of the undulating bag.

FIG. 4 is a cutaway perspective view showing the internal structure of the undulating bag.

FIG. 5 is a plan view showing a state in which sand is deposited in the above.

FIG. 6 is a plan view showing a sand discharging state according to the first embodiment;

FIG. 7 is a cross-sectional view showing the same sand discharging state.

FIG. 8 is a plan view showing a conventional example.

FIG. 9 is a cross-sectional view of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 River 3 Main bag 4 Auxiliary bag 6 Rubberized cloth 10, 11 Supply / exhaust pipe 12 Operation room 15 Waterway

────────────────────────────────────────────────── (5) References JP-A-7-18640 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02B 3/02 E02B 7/20 106

Claims (1)

(57) [Claims] 1. A plurality of undulating bags that are long in one direction are installed at intervals in a river so that the longitudinal direction thereof substantially follows the flow of water in the river, and between adjacent undulating bags.
A river sand discharging device comprising an undulating auxiliary bag for damming flowing river water, and a fluid supply / discharge means for inflating the undulating bag and the auxiliary bag, respectively.