JP2006257828A - Electric screen and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric screen which facilitates the construction and needs only a narrow area for the construction work when long electrode rods are constructed. <P>SOLUTION: The electric screen 1 is constructed as follows. Namely, a fixing concrete 7 is constructed over a water intake passage 2b where a water intake port screen 3 is installed, and an electrode rod fixing pipe 5 is temporarily fixed to the fixing concrete 7. After that, a plurality of rod parts 4a are connected. The rod parts 4a are moved down to the inside of the water intake passage 2b one after another while the electrode rods 4 which are freely bendable at rod part connecting parts 4b, respectively, are held up by an upper part of the fixing pipe 5 to have the state that the electrode rods 4 are bent at the connecting part 4b, and are finally fixed to the fixing pipe 5. After the electrode rod screen 6 is formed by fixing each of the electrode rods 4 to the fixing pipe 5, the fixing pipe 5 is fixed to the fixing concrete 7. Then, a voltage impression device 8, etc., is installed to impress voltage between the intake port screen 3 and the electrode rod screen 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric screen provided to prevent invasion of organisms such as fish at a water intake of a power plant or the like, and a construction method thereof. Specifically, a plurality of bar parts are connected and an electrode bar that can be bent at the connecting part between each bar part is provided, thereby facilitating the construction and reducing the work area necessary for the construction work. It is.

  In a water intake 51 such as a dam 50 shown in FIG. 14, a water intake screen 53 is installed on the dam 50 side to prevent dust from entering the water intake passage 52, and a water intake gate 54 is installed downstream. .

  Here, in order to prevent intrusion of fish and the like into the intake channel 52, it is necessary to narrow the pitch of the screen bar of the intake screen 53. However, when the pitch of the screen bar of the intake screen 53 is narrowed, problems such as an increase in installation cost, generation of screen loss, and increase in the cost of removing attached dust will occur.

  As a method for preventing intrusion of fish and the like other than narrowing the screen bar pitch of the intake screen 53, there is a method of installing an electric screen. The electric screen applies a voltage between a pair of electrode bar screens to cause electricity to flow, thereby preventing intrusion of fish and the like with a threat of electrical stimulation.

  FIG. 15 is a schematic perspective view showing a conventional electric screen 55, and FIG. 16 is a cross-sectional view showing an electrode bar screen 56 constituting the conventional electric screen 55.

  In the conventional electric screen 55, the electrode bar screen 56 is formed by fixing a plurality of electrode bars 57 each having a bar-shaped conductive member formed integrally with the electrode bar fixing portion 58 at a predetermined interval. A pair of electrode bar screens 56 are installed at predetermined intervals in the front-rear direction with respect to the intake passage 52 across the intake passage 52.

  Moreover, the electrode rod 57 of the conventional electric screen 55 is constructed as follows. The electrode rod 57 is lifted by a crane or the like above the electrode rod fixing portion 58 in accordance with the entire length of the electrode rod 57 and lowered into the intake channel 52, and then fixed to the electrode rod fixing portion 58.

  In addition to the above, an electric screen that can respond to changes in the water level has been proposed (see, for example, Patent Document 1).

  In the electric screen disclosed in Patent Document 1, a plurality of floats in which electrode rods are suspended are arranged in series, and a main body in which each electrode rod is connected by an electric wire is provided on pillars erected on both sides of a water channel. This is an electric screen capable of coping with changes in the water level due to the structure coupled to the guide member.

Japanese Patent No. 2851580

  However, since the conventional electric screen is provided with a bar-shaped conductive member in which the electrode bar is integrally formed, at the time of construction, a crane or the like is used at the upper part of the electrode bar fixing portion according to the length of the entire electrode bar. It was necessary to lift the electrode rod. For this reason, especially when constructing in deep waterways where long electrode rods are required, it is necessary to lift the electrode rods to a high position during construction, making the construction difficult, and a wide construction work area. There was a problem that was necessary.

  In addition, the electric screen proposed in Patent Document 1 is also configured so that the electrode bar is provided with an integral conductive member. There is a problem that it becomes difficult and requires a large construction work area.

  The present invention has been made to solve such a problem. Even when the construction is performed in a deep water channel that requires a long electrode rod, the construction is easy and the necessary construction work area is narrow. An object of the present invention is to provide an electrical screen and a method for constructing it.

  In order to solve the above-described problems, an electric screen according to the present invention includes an electrode bar screen fixed across a water channel in the electric screen for preventing invasion of living organisms in the water channel, and the electrode bar screen is applied with a voltage. Electrode rod fixing means for fixing the plurality of electrode rods and the plurality of electrode rods at a predetermined interval, and the electrode rods are connected at the rod portion connecting portion by a plurality of rod portions made of conductive members. Main body part, a mounting part to the electrode rod fixing means provided at the upper end of the main body part, and a weight part attached to the lower end of the main body part, and can be bent at each bar connecting part It is characterized by that.

  In the electric screen according to the present invention, a voltage is applied between the electrode bar screens to cause electricity to flow, thereby preventing intrusion of fish and the like with a threat of electric stimulation.

  In addition, the electric screen according to the present invention is configured such that the electrode rod can be bent at each rod portion connecting portion, but the weight portion provided at the lower end allows water flow or the like in the intake channel after installation. This prevents contact between the electrode rods.

  Moreover, the electric screen according to the present invention is constructed by the following method. While lifting the electrode rod so as to be bent at the upper part of the electrode rod fixing means, each rod portion is sequentially lowered into the water channel. Thereafter, the electrode rod is fixed to the electrode rod fixing means.

  In order to solve the above-mentioned problems, an electric screen construction method according to the present invention is an electric screen construction method for preventing invasion of organisms in a water channel, and a plurality of electrode bars to which a voltage is applied are fixed at a predetermined interval. The electrode rod fixing means to be installed on the upper part of the water channel, and a plurality of rod portions constituted by conductive members are connected by a rod portion connecting portion, and provided at the upper end of the body portion An electrode rod having an attachment portion to the electrode rod fixing means and a weight portion attached to the lower end of the main body portion and configured to be foldable at each rod portion coupling portion is bent at the rod portion coupling portion. Next, by lifting up the upper part of the electrode bar fixing means and then lowering it to the inside of the water channel from the lower end side to which the weight part is attached, each bar part is sequentially placed according to the height of the electrode bar fixing means. Take down into the waterway and remove It is characterized in that to secure the only part in the electrode rod fixing means.

  In the electric screen construction method according to the present invention, the electrode bars are lifted so as to be bent at the upper part of the electrode bar fixing means installed at the upper part of the intake channel, and the respective bar parts are sequentially connected to the water channel. Dropped inside. Thereafter, the electrode rod is fixed to the electrode rod fixing means.

  According to the electric screen of the present invention, a plurality of rod portions are connected, and the electrode rods that can be bent at the connecting portions between the respective rod portions are provided. It will be possible to drop it inside. As a result, it is possible to reduce the height of lifting the electrode rod, and even when constructing a long electrode rod in a deep water channel, it is easy to construct and work in a narrow work area Can do.

  In addition, by diverting the water intake screen for removing dust, the installation of the electrode bar screen is only one set, and the labor and cost for the installation can be reduced.

  According to the construction method of the electric screen of the present invention, a construction method in which a plurality of rod portions are coupled and the electrode rods that can be bent at the coupling portions between the respective rod portions are dropped into the water channel in a plurality of times. This makes it possible to reduce the height of lifting the electrode rod, and even when constructing a long electrode rod in a deep water channel, the construction can be facilitated and the construction work can be performed in a narrow work area. .

Embodiments of an electric screen and an electric screen construction method according to the present invention will be described below with reference to the drawings.
<Example of configuration of electric screen in this embodiment>
FIG.1 and FIG.2 is explanatory drawing which shows an example of the electric screen 1 of this Embodiment. FIG. 1A is a plan view, and FIG. 1B is a cross-sectional view taken along the line AA in FIG. FIG. 2 is a schematic perspective view showing a part of the fixed concrete 7 described later in a broken surface.

  The electric screen 1 of the present embodiment is installed in order to prevent fish and the like from entering the intake channel 2b at the intake port 2a. In addition, a water intake screen 3 is installed across the water intake channel 2b in the water intake port 2a in order to prevent dust from entering the water intake channel 2b. The intake screen 3 is formed by fixing a plurality of bar members (screen bars) made of a conductive member at a predetermined interval.

  In the electric screen 1 of the present embodiment, the electrode bar screen 6 formed by fixing a plurality of electrode bars 4 to the electrode bar fixing pipe 5 at a predetermined interval, and the electrode bar fixing pipe 5 are fixed to the water channel 2b. Fixed concrete 7 is provided. The fixed concrete 7 is provided with a construction hole 10 for construction of the electrode rod 4 and final installation of the electrode rod fixation pipe 5. The electrode rod fixing pipe 5 is an example of an electrode rod fixing means.

  Furthermore, the electric screen 1 of the present embodiment includes a voltage application device 8 that applies a voltage between the water intake screen 3 and the electrode bar screen 6.

  FIG. 3 shows an example of the configuration of the electrode rod 4. The electrode rod 4 is configured as follows, for example. In the electrode rod 4, a plurality of rod portions 4a made of a conductive member such as a metal are connected by a rod portion connecting portion 4b to form a main body portion 4c. The rod portion connecting portion 4b is configured by connecting conductive ring-shaped members provided at the end portions of the respective rod portions 4a, and can be bent at the rod portion connecting portion 4b.

  A flange-shaped weight attaching portion 4f for attaching the weight portion 4e is provided at the lower end of the weight rod portion 4d positioned at the bottom of the plurality of connected rod portions 4a. In addition, a fixing screw portion 4 h for attaching to the electrode rod fixing pipe 5 is provided at the upper end of the fixing rod portion 4 g positioned at the top of the plurality of connected rod portions. The weight portion 4e is attached to the weight attachment portion 4f.

  Further, the main body 4c and the weight 4e are coated with a coating for preventing corrosion on the surface except for the fixing screw 4h.

  FIG. 4 is an explanatory view of the electrode bar screen 6 and is a cross-sectional view taken along the line BB in FIG. The electrode rod fixing pipe 5 is formed of, for example, a conductive member such as metal, and includes a plurality of electrode rod attachment holes 5a for attaching the electrode rod 4 at a predetermined interval. The plurality of electrode bars 4 are fixed to the electrode bar attachment hole 5a by the fixing nut 4i at the fixing screw part 4h, and the electrode bar screen 6 is formed.

  Furthermore, the electrode bar fixing pipe 5 is fixed inside the construction hole 10, whereby the electrode bar screen 6 is fixed to the fixed concrete 7 across the intake channel 2b.

  In the electric screen 1 of the present embodiment, a voltage is applied between the water intake screen 3 and the electrode bar screen 6 by the voltage application device 8 or the like, so that electricity flows, thereby preventing invasion of fish and the like by the threat of electrical stimulation. It is a configuration. Therefore, since the intake screen 3 already installed in the intake channel 2b is diverted, a set of electrode bar screens 6 can be installed.

  Therefore, as described with reference to FIGS. 15 and 16, it is possible to reduce the labor and cost for installation compared to the conventional electric screen 55 in which a pair of electrode bar screens 56 needs to be installed. The distance in the front-rear direction on the intake channel 2b required for installation can be shortened.

  5 and 6 are explanatory views showing examples of the electric screen 1 according to another embodiment. FIG. 5A is a plan view, and FIG. 5B is a cross-sectional view taken along the line CC in FIG. FIG. 6 is a schematic perspective view showing a part of the fixed concrete 7 in a broken section.

  The electric screen 1 shown in FIGS. 5 and 6 includes a pair of electrode bar screens 6 described in FIG. 4 and the like, and a voltage is applied between the two electrode bar screens 6 by a voltage applying device 8. The intake screen 3 can be applied to the intake channel 2 b that cannot be used as a part of the electric screen 1.

<Example of construction method of electric screen of this embodiment>
Next, a construction method of the electric screen 1 having the configuration described with reference to FIG.
FIG. 7 is an explanatory view showing a state in which the electrode rod fixing pipe 5 and the electrode rod construction device 9 are installed on the upper portion of the fixed concrete 7. The fixed concrete 7 shows a state cut along A-A in FIG.

  In the intake channel 2b where the intake screen 3 is installed, the fixed concrete 7 provided with the construction hole 10 is applied to the upper part of the intake channel 2b. After the fixed concrete 7 is constructed, the electrode rod fixing pipe 5 is temporarily fixed by the suspension member 11 or the like above the construction hole 10.

  Further, an electrode bar construction device 9 is installed on the fixed concrete 7. The electrode bar construction device 9 includes a pulley support portion 9a, a pulley 9b, a winch 9c, a rope 9d, a hook 9e attached to the rope 9d, and the like.

  In the electrode bar construction apparatus 9, a rope 9d attached to the winch 9c is installed via a pulley 9b, and the member attached to the hook 9e can be raised and lowered with a predetermined height by the winch 9e. ing. The electrode bar construction device 9 is installed at the upper part of the construction hole 10 so that the hook 9e can be raised and lowered.

  Further, in FIG. 3, the rod portion 4a connected to the weight rod portion 4d of the electrode rod 4 is a second rod portion 4j, and the connection portion between the weight rod portion 4d and the second rod portion 4j is a first connection portion 4k. A connecting portion between the second rod portion 4j and the fixed rod portion 4g is defined as a second connecting portion 4l.

8 to 13 are explanatory views showing the construction process of the electrode rod.
First, the hook 9e of the electrode rod construction device 9 is attached to the first connecting portion 4k of the electrode rod 4 to be constructed. FIG. 8 shows a state in which the hook 9e is attached to the first connecting portion 4k.

  FIG. 9 shows a state where the hook 9e attached to the first connecting portion 4k is lifted. After attaching the hook 9e to the first connecting portion 4k, the hook 9e is lifted above the construction hole 10 by the winch 9c in accordance with the length of the weight bar portion 4d and the weight portion 4e. The electrode rod 4 is lifted in a state of being bent at the first connecting portion 4k to which the hook 9e is attached.

  FIG. 10 shows a state in which the hook 9e is changed from the first connecting portion 4k to the second connecting portion 4l, and FIG. 11 shows a state in which the electrode rod 4 is temporarily fixed to the construction hole 10. FIG. After lifting the hook 9e attached to the first connecting portion 4k, for example, the hook 9e is lowered until the first connecting portion 4k reaches the height of the electrode rod fixing pipe 5.

  After the hook 9e is lowered to a predetermined height, the electrode rod 4 is temporarily fixed to the fixed concrete 7. For example, as shown in FIG. 11, the temporary fixing is performed by inserting a metal rod 12 or the like into the ring portion of the first connecting portion 4 k, and the electrode rod 4 is fixed at the upper portion of the construction hole 10 by the inserted metal rod 12. This is done in such a way. After the electrode rod 4 is temporarily fixed, the hook 9e is removed from the first connecting portion 4k and attached to the second connecting portion 4l.

  FIG. 12 shows a state where the hook 9e attached to the second connecting portion 4l is lifted. After the hook 9e is attached to the second connecting portion 4l, the hook 9e is lifted above the construction hole 10 according to the length of the second rod portion 4j.

  FIG. 13 shows a state in which the electrode rod 4 is attached to the electrode rod fixing pipe 5. After lifting the hook 9e, the metal rod 12 used for temporarily fixing the electrode rod 4 to the fixed concrete 7 is removed, and the second connecting portion 4l is moved until the fixing screw portion 4h reaches the height of the electrode rod fixing pipe 5. Lower the attached hook 9e. Thereafter, the fixing screw portion 4h is fixed to the electrode rod fixing pipe 5 by the fixing nut 4i while the electrode rod 4 is suspended by the hook 9e.

  In the construction method of the electric screen 1 according to the present embodiment, as described with reference to FIGS. 8 to 13, the electrode rod fixing pipe 5 is arranged so that the electrode rod 4 is bent at the rod connecting portion 4 b. It is possible to divide it into the intake channel 2b in a plurality of times while lifting it at the top of the water.

  Therefore, as described with reference to FIGS. 15 and 16, when the electrode rod 57 is constructed, the electrode is more suitable for the construction than the conventional electric screen 55 that needs to be lifted to a higher position in accordance with the entire length of the electrode rod 57. The height for lifting the rod 4 can be reduced.

  As a result, the height at which the required hook 9e can be lifted by the electrode rod construction device 9 can also be lowered according to the length of the weight portion 4e and each rod portion 4a that are lifted above the construction hole portion 10. Therefore, even when a long electrode rod is constructed in a deep water channel, the construction can be facilitated and the construction work can be performed in a narrow work area.

  Moreover, in the construction method of the electric screen 1 of this Embodiment, since the weight part 4e is provided in the lower end part of the electrode bar 4, when lowering to the inside of the intake channel 2b, the electrode bar 4 shakes to a horizontal direction. It is possible to prevent entanglement with other electrode rods 4.

  After each electrode rod 4 is fixed to the electrode rod fixing pipe 5, as shown in FIGS. 1 (a) and 1 (b), the electrode rod fixing pipe 5 is lowered into the construction hole 10 to be fixed concrete 7. Fix it. After the electrode rod fixing pipe 5 is fixed, the fixing pipe lid 7 a is installed on the upper part of the construction hole 10.

  In order to apply a voltage between the intake screen 3 and the electrode bar screen 6 after installation of the fixed pipe lid 7a, a voltage application device 8 or the like is installed.

  The present invention is applied to an electric screen provided to prevent invasion of organisms such as fish at intakes of power plants, dams and the like.

It is explanatory drawing which shows the example of the electric screen of this Embodiment. It is a schematic perspective view which shows the example of the electric screen of this Embodiment. It is a block diagram which shows the example of an electrode bar. It is a block diagram which shows the example of an electrode bar screen. It is explanatory drawing which shows the other example of the electric screen of this Embodiment. It is a schematic perspective view which shows the other example of the electric screen of this Embodiment. It is a block diagram which shows the example of an electrode stick construction apparatus. It is explanatory drawing which shows the construction process of an electrode bar. It is explanatory drawing which shows the construction process of an electrode bar. It is explanatory drawing which shows the construction process of an electrode bar. It is explanatory drawing which shows the state of the electrode rod temporarily fixed. It is explanatory drawing which shows the construction process of an electrode bar. It is explanatory drawing which shows the construction process of an electrode bar. It is explanatory drawing which shows a water intake. It is explanatory drawing which shows the conventional electric screen. It is explanatory drawing which shows the conventional electrode bar screen.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric screen 2a Water intake 2b Water intake channel 3 Water intake screen 4 Electrode bar 5 Electrode bar fixed pipe 6 Electrode bar screen 7 Fixed concrete 9 Electrode bar construction apparatus

Claims (4)

In an electric screen that prevents the invasion of organisms in waterways,
Comprising an electrode bar screen secured across the water channel,
The electrode bar screen includes a plurality of electrode bars to which a voltage is applied and electrode bar fixing means for fixing the plurality of electrode bars at a predetermined interval.
The electrode bar has a main body part formed by connecting a plurality of bar parts made of a conductive member at a bar part connecting part, and is attached to the electrode bar fixing means provided at the upper end of the main body part An electric screen comprising: a weight portion attached to a lower portion of the body portion and the main body portion, and being configured to be foldable at each of the rod portion connecting portions. A plurality of bar members made of conductive members are formed at fixed intervals, and includes a water intake screen fixed across the water channel,
The intake screen and the electrode bar screen are installed at predetermined intervals in the front-rear direction with respect to the water channel,
The electric screen according to claim 1, wherein a voltage is applied between the intake screen and the electrode bar screen. A pair of the electrode bar screens installed at predetermined intervals in the front-rear direction with respect to the water channel,
The electric screen according to claim 1, wherein a voltage is applied between the two electrode bar screens. In the construction method of the electric screen that prevents the invasion of organisms in the waterway,
An electrode rod fixing means for fixing a plurality of electrode rods to which a voltage is applied at a predetermined interval is installed on the upper part of the water channel,
A main body part formed by connecting a plurality of bar parts made of conductive members at a bar part connecting part, an attachment part to the electrode bar fixing means provided at the upper end of the main body part, and the main body part The electrode rod fixing means includes a weight portion attached to a lower end of the electrode rod and is configured to be foldable at each rod portion connecting portion. By lifting the upper part and then lowering the inside of the water channel from the lower end side to which the weight part is attached, the respective bar parts are sequentially placed in the water channel according to the height of the electrode bar fixing means. Down inside,
A method for constructing an electric screen, wherein the attachment portion is fixed to the electrode rod fixing means.

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