JPH0618437U - Lifting fishway - Google Patents

Abstract

(57) [Summary] [Purpose] When a fishway is installed on the front side of the gate of a movable weir, the fishway is removed when the gate is opened, and the planned water level associated with opening the gate is effective. The fishway can be secured and the fishway can be easily installed. [Structure] The fishway body 3 arranged on the front surface of the movable weir 1 on the downstream side of the gate door body 2 is movably installed up and down by an elevating device 7, and in parallel with opening the gate, the fishway body 3 is also elevating by the elevating device 7. It can be raised or lowered, and thus the planned cross section due to the opening of the gate can be accurately ensured, and large-scale civil engineering work and the like can be performed on the existing movable weir of this fishway body 3. It can be installed relatively easily without being accompanied.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This device is designed so that when a fishway is installed on the downstream side of the gate of a movable weir as a river structure and the gate is opened, the fishway is removed and the planned water level associated with the opening of the gate is maintained. The present invention relates to a lifting type fishway that can be effectively secured and can be easily installed.

[0002]

[Prior art]

 The definition of fishways has been said to be various for a long time, but in recent years, “weirs, head works, dams that are installed across rivers and may or may block the movement of fish. It is said to be a waterway or device installed in a structure such as to reduce or remove the obstruction.

There are various types of fishways, but all fishways to date have been constructed by bypassing the sides of river structures such as weirs or by fixing them to the riverbed. After that, it was impossible to move it. In these fishways, part or all of them are placed on the front side of the movable weir, which is the river structure, on the downstream side of the gate door due to topographical restraint of the river and selective restraint of the portion that should be the entrance of the fishway. In some cases, it had to be constructed so as to extend.

On the other hand, the fishways constructed in recent years are often constructed at the same time as the construction of the river structure, but some existing river structures do not have a fishway.

[0005]

[Problems to be solved by the device]

 Therefore, as described above, when the fishway extends to the front surface on the downstream side of the gate door, the fishway remains as it is even after the gate is opened. However, as for the design of the weir, the space with the gate open is an important cross section for knowing the amount of water flowing down there, and this cross section must be secured in advance as a so-called planned cross section. However, due to the existence of fishways, the planned cross section will be reduced or obstructed.

This is also the case when a fishway is newly installed in parallel with an existing weir that does not have a fishway, and by constructing a new fishway, the planned cross section of the existing weir is obstructed. It will be.

In addition, the construction of a new fishway in this way means that if this fishway is of the fixed type shown as the above-mentioned conventional example, as a result of consideration so as not to obstruct the planned cross section, the weir Therefore, not only the construction work becomes large-scale, but also the construction cost increases, and civil and economic problems arise.

[0008]

[Means for Solving the Problems]

 Therefore, in order to solve the above-mentioned problems, the lifting fishway according to the present invention arranges the fishway main body on the front side of the downstream side of the gate door of the movable weir as the river structure, and moves the fishway main body up and down by the lifting device. It is installed freely.

[0009]

[Action]

 That is, in parallel with opening the gate, the fishway main body can also be raised or lowered by the lifting device, so that the planned cross section can be accurately ensured when the gate is opened, and the fishway main body can also be secured. Even if the existing movable weir is installed, it can be installed relatively easily without any large-scale civil engineering work.

[0010]

【Example】

 Next, an embodiment of an elevating type fishway according to the present invention will be described with reference to the drawings. 1 is a conventionally known movable weir, and 2 is a gate door body of the movable weir 1.

Reference numeral 3 denotes a fishway main body disposed on the front surface on the downstream side of the gate door body 2. The fishway main body 3 may be of any type, but here, a so-called staircase type (FIG. 1) is used. To FIG. 3 and FIGS. 7 to 9) and a spiral type (see FIGS. 4 to 6).

1 to 6, the fishway main body 3 is fixedly connected to the gate door body 2 without being fixed to the river bed 4.

Therefore, when the gate door body 2 is moved up and down by an elevating device that moves the gate door body 2 up and down, the fishway body 3 also moves up and down accordingly. Therefore, as a result of opening the gate, the fishway body 3 is inevitably removed, and it is possible to effectively and accurately secure the planned cross section due to the opening of the gate.

It should be noted that, depending on the height of the fishway entrance of the fishway body 3, that is, the height of the lower end of the fishway body 3 in the above, it may collide with the riverbed when this portion descends. In order to avoid the problem, the load of the fishway main body 3 is arranged to be slightly higher so that the lower end of the fishway main body 3 does not land even when the gate door body 2 is lowered, and a flexible material such as rubber is provided from the lower end thereof. In some cases, the gutter-shaped guide path 5 formed by the member is connected.

7 to 9 show an embodiment of a system in which the fishway main body 3 is not connected to the gate door body 2, but in this case, the riverbed immediately below the gate door body 2 is provided. 4, a recess 6 having a size capable of accommodating the entire fishway body 3 is formed, and a piston rod 8 of a hydraulic cylinder 7 (elevating device) embedded in the riverbed 4 is connected to the lower surface of the fishway body 3. It was done.

By operating the hydraulic cylinder 7, the fishway body 3 can be vertically retracted from the recess 5, and the fishway body 3 can be moved up or down at the same time as the gate door body 2 is raised. Since the fishway main body 3 does not exist on the riverbed 4 after the gate is opened, the planned cross section of the gate can be secured in this case as well.

In any of the above-mentioned embodiments, disposing the fishway main body 3 can be relatively easily performed without requiring a large-scale civil engineering work as has been conventionally done. .

[0018]

[Effect of device]

 As described above, according to the elevating type fishway according to the present invention, the fishway body is arranged on the front side of the downstream side of the gate of the movable weir as a river structure, and the fishway body is vertically movable by the elevating device. Since it is installed at the gate, the fishway body can be raised or lowered by the lifting device in parallel with opening the gate, so that the planned cross section due to the opening of the gate can be accurately secured. At the same time, this fishway main body can be installed relatively easily on an existing movable weir without requiring extensive civil engineering work.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a lifting type fishway according to the present invention.

FIG. 2 is a front view showing an embodiment of a lifting fishway according to the present invention.

FIG. 3 is a side view showing an embodiment of a lifting type fishway according to the present invention.

FIG. 4 is a plan view showing another example of the lifting type fishway according to the present invention.

FIG. 5 is a front view showing another example of the lifting fishway according to the present invention.

FIG. 6 is a side view showing another example of the lifting fishway according to the present invention.

FIG. 7 is a plan view showing another example of the lifting fishway according to the present invention.

FIG. 8 is a front view showing another example of the lifting fishway according to the present invention.

FIG. 9 is a side view showing another example of the lifting fishway according to the present invention.

[Explanation of symbols]

 1 movable weir 2 gate door body 3 fish reef body 4 river bed 5 taxiway 6 recess 7 hydraulic cylinder 8 piston rod

Claims (5)

[Scope of utility model registration request] 1. An elevating type fishway, wherein the fishway body is arranged on a front surface of a movable weir as a river structure on a downstream side of a gate door body, and the fishway body is vertically movable by an elevating device. 2. The lifting type fishway according to claim 1, wherein the fishway body is fixedly connected to the gate door body without being fixed to the riverbed. 3. The lifting fishway according to claim 1 or 2, wherein the lifting device is a lifting device for a gate door. 4. The elevating type fishway according to claim 1, wherein a recess for accommodating the fishway main body is formed on the riverbed facing the downstream side of the gate door body, and the fishway main body is arranged so as to be capable of appearing and retracting in the vertical direction of the recess. 5. The lifting fishway according to claim 1, wherein the lifting device is a hydraulic cylinder connected to the lower surface of the fishway body.