JPH05331825A - Dredging method for deposited silt in reservoir - Google Patents

Abstract

PURPOSE:To enable a reservoir to be dredged in a short period of time without once suspending its function as a reservoir, and also enable dredging works to be carried out without using special clamshells with no final effluent contaminated. CONSTITUTION:The water flow of a river 10 is dammed up by a dam body 20, a reservoir 30 which is figured out so as to be formed by the use of the dam body 20 and side walls 11 provided at both the banks of the river 10, is divided into three block reservoirs 30 by two bulkheads 40 erected while being arranged in the river width direction of the river 10. One set out of three sets of gates 51 and 52 provided correspondingly to the respective reservoirs 31, is closed, so that a water channel to one block reservoir 31 out of three is covered. Water stored in the block reservoir 31 is discharged outside the reservoir 30 through an irrigation tunnel 71, so that silted deposits is dredged and taken out by both lorries and clamshells brought in the block reservoir 31 from which water has been discharged, from the outside of the reservoir 30 through a take-out tunnel 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dredging sediment in a reservoir such as a dam.

[0002]

2. Description of the Related Art For example, to regulate the flow rate of a river,
Conventionally, in order to store domestic water or perform hydroelectric power generation,
A reservoir is formed by blocking the upstream point of the river with a dam. By the way, generally, in a reservoir, sediment and other materials mix with the water flow from the upstream side and accumulate at the bottom, and if left unattended for a long period of time, the bottom of the reservoir will become shallow and the reservoir's water storage capacity will decrease. Cannot be used. However, it is difficult to secure a site for constructing a new alternative reservoir, especially in a reservoir near the city. Therefore, it is necessary to dredge the accumulated sediment so that it can be used for a long time.

Therefore, conventionally, all of the stored water is discharged downstream of the reservoir to collectively dredge the sediment, or the dredger is used to dredge the sediment while it is still stored.

[0004]

However, in the conventional method in which all the stored water is discharged to the downstream of the reservoir for dredging, there is a problem that the function as a reservoir must be temporarily suspended for dredging work. On the other hand, the conventional method using a dredger has the problems that the discharged water is polluted and that a special dredging machine is required. Also, in the former conventional method, it is necessary to discharge water while adjusting the water volume so that the water level on the downstream side of the reservoir does not rise sharply, while in the latter conventional method, the dredging work capacity of the dredger is low, All of them had a problem that it took a long time to complete the dredging work.

The present invention has been made in view of the above circumstances, and it is possible to perform dredging work without suspending its function as a reservoir and to pollute discharged water without using a special dredging machine. It is an object of the present invention to provide a method for dredging sediment in a reservoir, which enables dredging work to be carried out. Another object of the present invention is to provide a method for dredging sediment in a reservoir, which enables dredging work in a short period of time.

[0006]

In order to achieve the above-mentioned object, the present invention is a method for dredging sediment in a reservoir formed by damming a channel with a dam body, wherein the reservoir is in the water flow direction of the channel. The water in each of the divided reservoirs was sequentially drained, and the sediment of the drained reservoir was sequentially dredged. Further, according to the present invention, a tunnel is provided which connects the partitioned reservoir portion and the outside of the reservoir, and the sediment of the partitioned reservoir portion is carried out to the outside of the reservoir through the tunnel.

[0007]

EXAMPLE A method of dredging sediment in a reservoir according to the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a reservoir showing an embodiment of a method for dredging sediment in a reservoir according to the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG.
FIG. 4 is a sectional view taken along line C-C of FIG.

Further, in FIG. 1, reference numeral 10 denotes a river as a water channel, and a water reservoir is formed by damming the water flow by a dam body 20 and is formed by the dam body 20 and side walls 11 provided on both banks of the river 10. Forming 30. This reservoir 30
Is a direction crossing the water flow direction X of the water flowing through the river 10,
That is, it is divided into three divided reservoirs 31 by the two dividing walls 40 arranged side by side in the river width direction of the river 10. At the upstream end of each dividing wall 40, the water flowing into the reservoir 30 is distributed to each divided reservoir 31. A guide wall 41 for standing is provided upright.

As shown in FIG. 1, a bank 50 is erected at the upstream end of the reservoir 30, and the bank 50 has a guide wall 41 as shown in FIGS. 1, 3 and 4. Three gates 51 that can be moved up and down for opening and closing the flow path of the water flow that is distributed by the above and flows into each partitioned reservoir 31 are provided. Furthermore, as shown in FIG. 1, FIG. 3 and FIG.
At the bottom of the reservoir 30 at the standing position of 0, three movable gates 52 for opening and closing the flow path of the water flow flowing into each partitioned reservoir 31 in cooperation with the respective gates 51 are provided.

The gate 51 is normally in a raised position to open the flow path of the water flow flowing into each of the compartment reservoirs 31 and to shut off the water flow flowing into each of the compartment reservoirs 31, for example, a rack, a pinion, a motor, etc. Is driven by a drive mechanism (not shown). On the other hand, the gate 52 is normally in the lowered position to open the flow path of the water flow flowing into each of the compartment reservoirs 31 and to shut off the water flow flowing into each of the compartment reservoirs 31, for example, a drive (not shown) including a hydraulic mechanism or the like. Ascended by the mechanism, it cooperates with each of the gates 51 to block the flow path of the water flow flowing into each of the compartment reservoirs 31. A jet valve (not shown) for ejecting compressed air is provided at the upper end of the gate 52, and when the gate 52 is raised, the compressed air supplied from an air supply source (not shown) is ejected, The drive torque of the drive mechanism when raising the gate 52 is reduced.

Further, in FIG. 1, reference numeral 60 denotes a carry-out tunnel which communicates with the respective compartment reservoirs 31 from the outside of the reservoir 30 through the side wall 11 and the partition wall 40, and as shown in FIGS. 1 and 2, the respective compartment reservoirs. Opening and closing doors 61 for entering and exiting 31 are provided on both side wall portions. Further, in FIG. 1, reference numeral 70 denotes the side wall 11 or the partition wall 40 of each partitioned reservoir 31.
It is the water intake provided at approximately the bottom. A water tunnel 71 communicating with the outside of the reservoir 30 is connected to each intake 70, and the water stored in each compartment reservoir 31 is drained to the outside of the reservoir 30 via the water tunnel 71 as needed. It has become so. In addition, a strainer is attached to the water intake 70 so that each compartment reservoir 31 is connected to the water tunnel 7.
Sediment may not be mixed into the water discharged to the outside of the reservoir 30 through the water.

In the reservoir 30 having such a structure, dredging of the sediment in the reservoir 30 is performed by the following steps.
First, all the opening / closing doors 61 of the carry-out tunnel 60 are closed, and one of the three sets of gates 51 and 52 provided corresponding to each compartment reservoir 31 is closed to reach one of the three compartment reservoirs 31. Block the waterways of. Next, the stored water in the partitioned reservoir 31 whose water channel is shielded is used as a water tunnel 71.
The water is drained to the outside of the reservoir 30 via the.

Further, an opening / closing door 61 leading to the inside of the compartment reservoir 31 after drainage is opened, and a transport vehicle such as a dump truck or an excavating machine (from the outside of the reservoir 30 via the carry-out tunnel 60 into the compartment reservoir 31 after drainage). (None of which is shown), the sediment in the compartment reservoir 31 is loaded on the transport vehicle, and the sediment is carried out of the reservoir 30 via the carry-out tunnel 60, so that the deposit in the compartment reservoir 31 after drainage is carried out. Dredge the sand. Then, the gate 51 of the partitioned reservoir 31 after dredging,
52 is opened to open the water channel to the partitioned reservoir 31 after this dredging, and the gates 51 and 52 provided corresponding to one of the remaining two partitioned reservoirs 31 are closed to close the partitioned reservoir 3
Block the waterway to 1.

Then, by the same process as described above, the sediment in the partitioned reservoir 31 whose water channel is shielded is dredged, and thereafter, the above processes are repeated for the remaining partitioned reservoirs 31 in order to carry out all the steps. The dredging of sediment for the compartment reservoir 31 is performed.

It should be noted that while dredging the sediment in one compartment reservoir 31, the water flow from the upstream of the river 10 is gate 51,
52 flows into the remaining two partitioned reservoirs 31, and out of this flow, the water that overflows the discharge port 21 of the bank 20 is discharged downstream of the river 10, so that the reservoir 30 as a whole is normal. The water storage function is maintained.

Thus, according to the dredging method of this embodiment,
The reservoir 30 defined by the bank 20 and the side walls 11 provided on both sides of the river 10 is divided into three divided reservoirs 31 by two partition walls 40, and the water flow into each divided reservoir 31 is sequentially blocked. Since the sediment in the divided reservoir 31 is successively dredged, it is possible to perform the dredging of the sediment while maintaining the water storage function of the reservoir 30 as a whole, and without using a special dredging machine and the discharged water. Dredging can be done without soiling. Further, since the dredging and unloading of the sediment is carried out by a transportation vehicle such as a dump truck or an excavating machine carried in from the outside of the reservoir 30 through the unloading tunnel 60, the dredging work can be completed in a short period of time.

In this embodiment, the water stored in the compartment reservoir 31 in which the gates 51 and 52 are closed to shield the water channel is
It is assumed that the water is drained to the outside of the reservoir 30 via the water intake 70 provided at the side wall 11 of each of the partitioned water reservoirs 31 or the lowermost portion of the partition wall 40 and the water tunnel 71 leading to the water intake 70. Any drainage means may be used, such as pumping up the stored water inside the reservoir 31 with a pump and draining it to the outside of the reservoir 30. Further, the gate that opens and closes the water passage to each partitioned reservoir 31 is not limited to the one shown in the embodiment.

Further, in this embodiment, a carrier vehicle and an excavating machine are carried into the compartment reservoir 31 after drainage through the carry-out tunnel 60, and the sediment in the compartment reservoir 31 is loaded on the carrier vehicle and carried out the tunnel. Although it is assumed that it is carried out of the reservoir 30 via 60, the sediment in the compartment reservoir 31 is dredged,
The means for carrying out is not limited to the one shown in the embodiment, and for example, a belt conveyor may be installed in the carry-out tunnel 60 to carry out dredged sediment to the outside of the reservoir 30 by means of the belt conveyor.

[0019]

As described above, according to the present invention, there is provided a method of dredging the sediment of a reservoir formed by damming the channel with a dam body, which is a direction intersecting the water flow direction of the channel. Since the water in each of the divided reservoirs is sequentially drained and the sediment of the drained reservoir is sequentially dredged, the dredging work can be performed without suspending the function of the reservoir. Moreover, the dredging work can be performed without polluting the discharged water without using a special dredging machine. Further, according to the present invention, a tunnel that connects the partitioned reservoir portion and the outside of the reservoir is provided, and the sediment of the partitioned reservoir portion is transported to the outside of the reservoir through the tunnel. Therefore, the dredging work can be done in a short period.

[Brief description of drawings]

1 is a plan view of a reservoir showing an embodiment of a method for dredging sediment in a reservoir according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

 20 Embankment 30 Reservoir 31 Divided Reservoir (Divided Reservoir Part) 60 Transport Tunnel (Road)

Claims (2)

[Claims] 1. A method of dredging sediment in a reservoir formed by damming a waterway with a dam, comprising partitioning the reservoir in a direction intersecting with a water flow direction of the waterway, A method for dredging sediment in a reservoir, characterized in that water is sequentially drained, and the drained sediment in the reservoir is sequentially dredged. 2. A tunnel is provided to connect the divided reservoir portion to the outside of the reservoir, and the sediment of the divided reservoir portion is carried out to the outside of the reservoir through the tunnel. Item 1. A method of dredging sediment in a reservoir according to item 1.