JP2012205512A - Extension device of jellyfish inflow-preventing net, and extension method of jellyfish inflow-preventing net using the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extension device of a jellyfish inflow-preventing net, capable of facilitating the hoisting of the jellyfish inflow-preventing net from the sea and the extension thereof into the sea by smooth rotation of a guide pulley by installing the guide pulley for winding an extension rope of the jellyfish-inflow preventing net on the sea bottom side at a position distant from the sea bottom, when extending the jellyfish-inflow preventing net on the front surface of an intake provided in a quay wall, to thereby avoid a situation such that the guide pulley is buried in sludge or the like; and to provide an extension method of the jellyfish inflow-preventing net using the extension device of the jellyfish inflow-preventing net.SOLUTION: In the extension device of the jellyfish-inflow preventing net, the guide pulley for winding the extension rope of the jellyfish-inflow preventing net on the sea bottom side when extending the jellyfish-inflow preventing net on the front surface of the intake provided on the quay wall is installed at a position distant from the sea bottom.

Description

  The present invention prevents the occurrence of a situation where floating substances such as jellyfish enter a water intake of a facility that uses a large amount of seawater as cooling water, such as a nuclear power plant or a thermal power plant. Therefore, the present invention relates to a jellyfish inflow prevention net expanding device that extends a jellyfish inflow prevention net in front of a water intake and a jellyfish inflow prevention net expansion method using the jellyfish inflow prevention net expansion device.

  For example, facilities such as nuclear power plants and thermal power plants are often installed on the coast in order to use seawater as cooling water. In such a facility, a large amount of seawater is taken through a water intake provided on the quay.

  At this time, in order to prevent floating substances such as jellyfish from flowing into the water channel of the facility from the seawater intake, for example, as shown in FIG. In general, it is spread in an inclined manner.

  Since this jellyfish inflow prevention network A is installed so as to surround the whole intake port, for example, as shown in FIG. It is a large one of 10 meters. Further, the jellyfish inflow prevention network A is configured by dividing the entire net into a plurality of pieces, and binding the divided nets with a rope and integrating them.

  Further, in each of the divided nets, a development rope R1 is disposed on the lower edge on both sides of the net, and a pulling rope R2 is disposed on the upper edge on both sides of the net.

  As shown in FIG. 3, the unfolding rope R1 of the net is wound around a guide pulley 100 attached to a concrete sinker block B installed on the seabed, and then the end of the unfolding rope R1 is over the sea. It is arranged on the stanchion S side. Further, the end of the net lifting rope R2 is also disposed on the stanchion S side on the sea.

  In addition, there exists a jellyfish intrusion prevention device shown in Patent Document 1 as a device for preventing the jellyfish from flowing into the water intake. As shown in FIG. 5, this apparatus includes a jellyfish inflow prevention network A that extends from the sea floor to the water surface in front of the seawater intake, and a curtain wall W is installed over the entire width of the seawater intake. At the same time, a sinker B1 is embedded in the sea floor of the curtain wall W, and a guide pulley 100 for the deployment rope R1 of the jellyfish inflow prevention network A is attached to the sinker B1, and the upper part of the curtain wall W is attached to the sinker B1. Although the work is provided with the winding means S1 of the development rope R1, a guide pulley 100 is installed in the vicinity of the seabed.

Japanese Patent Laid-Open No. 10-110423

  As described above, the jellyfish inflow prevention network A shown in FIGS. 3 and 4 and the jellyfish inflow prevention network A (see FIG. 5) shown in Patent Document 1 are both guide pulleys 100 around which the development rope R1 is wound. However, because it is installed in the vicinity of the seabed, the following adverse effects have occurred.

  That is, when lifting the jellyfish inflow prevention net A, the lifting rope R2 is pulled up while loosening the development rope R1 wound around the guide pulley 100, and the rotation of the guide pulley 100 is used to invade the jellyfish. Although the prevention net A is pulled up, since the guide pulley 100 is installed in the vicinity of the seabed, if sludge accumulates on the seabed according to various underwater environments, as shown in FIG. 3 and FIG. The guide pulley 100 is easily buried in sludge or the like.

  As shown in FIGS. 3 and 5, if the guide pulley 100 is buried in sludge for a predetermined period, the guide pulley 100 becomes unable to rotate and the deployment rope R1 cannot be loosened. Has occurred.

  In addition, when the jellyfish inflow prevention net A is expanded in the sea, it is necessary to first wind the unfolding rope R1 around the guide pulley 100, but the guide pulley 100 is buried in sludge or the like. In this case, the troublesome work of removing the sludge and exposing the guide pulley 100 in advance must be performed.

  Further, by pulling up the end of the development rope R1 wound around the guide pulley 100 on the shore stanchion S side, the jellyfish inflow prevention network A is extended to a predetermined position while rotating the guide pulley 100. However, depending on the underwater environment, the guide pulley 100 is often buried in sludge or the like within a relatively short period of time, and the guide pulley 100 is often unable to rotate.

  Therefore, the present invention was created in view of the existing circumstances as described above, and in the case where the jellyfish inflow prevention net is extended on the front surface of the water intake provided on the quay, the jellyfish inflow prevention net is provided. By installing a guide pulley that winds the unfolded rope on the seabed side at a position away from the seabed, it is possible to avoid the situation where the guide pulley is buried in sludge, etc. The jellyfish inflow prevention net and the jellyfish inflow prevention net can be easily lifted from the sea by a smooth rotation and can be easily extended to the sea. An object is to provide a method for extending an inflow prevention network.

  The device for extending a jellyfish inflow prevention net according to the present invention winds a deployment rope provided in the jellyfish inflow prevention net on the seabed side when the jellyfish inflow prevention net is extended in front of a water intake provided on a quay. The problem mentioned above was solved by having installed the guide pulley to perform in the position away from the seabed.

  Moreover, the problem mentioned above was similarly solved by installing the guide pulley at a position approximately 0.5 to 4 meters away from the seabed.

  Furthermore, the problem mentioned above was solved by having installed the guide pulley in the position about 3 meters away from the seabed.

  Further, the guide pulley has been fixed to a sinker block installed on the seabed via a chain having a predetermined length, thereby solving the above-described problem.

  In addition, the method for extending the jellyfish inflow preventing net according to the present invention solves the above-described problem by using the above-described apparatus for extending the jellyfish inflow preventing net.

  The device for extending a jellyfish inflow prevention net according to the present invention winds a deployment rope provided in the jellyfish inflow prevention net on the seabed side when the jellyfish inflow prevention net is extended in front of a water intake provided on a quay. Since the guiding pulley is installed at a position away from the seabed, the guiding pulley is prevented from being buried in sludge or the like in the sea.

  As a result, the smooth rotation of the guide pulley installed in the sea can be maintained at all times, and by operating the deployment rope wound around the guide pulley, the jellyfish inflow prevention network can be lifted from the sea and into the sea. Extension can be easily performed.

  Specifically, in the jellyfish inflow prevention network that is deployed in the sea, the guide pulley rotates smoothly by pulling the pull-up rope while loosening the deployment rope, and the deployment rope that is wound around the guide pulley Is sent out toward the sea, and the jellyfish inflow prevention network is lifted from the sea.

  In addition, the guide pulley is installed at a position away from the seabed to avoid the situation where the guide pulley is buried in sludge, etc. In addition, when the unfolding rope is wound around the guide pulley, it is not necessary to perform the troublesome work of removing sludge and exposing the guide pulley in advance.

  Furthermore, by pulling up the end of the unfolding rope wound around the guide pulley on the stanchion side at sea, the guide pulley can be rotated smoothly and the jellyfish inflow prevention net can be quickly extended to a predetermined position. Can do.

  In addition, when the guide pulley is installed at a position approximately 0.5 to 4 meters away from the seabed, it is possible to avoid the situation where the guide pulley is buried in sludge in many seas in Japan. can do.

  In addition, when the guide pulley is installed at a position approximately 3 meters away from the seabed, for example, it is possible to avoid the situation where the guide pulley is buried in sludge or the like in the sea in the Tokyo Bay area. Proven.

  Moreover, since the guide pulley is attached to the sinker block installed on the seabed via a chain having a predetermined length, the separation distance from the seabed can be changed relatively easily.

  Therefore, when a sludge etc. is installed at the time of new installation or immediately after dredging, if the jellyfish inflow prevention network extension device according to the present invention is installed, a guide pulley will be installed in the sea area where sludge accumulation is expected after that. It is possible to maintain the function of the device for extending the jellyfish inflow prevention network by appropriately changing the position of the jellyfish.

  Specifically, when sludge accumulates, change the position of the guide pulley by adjusting the length of the chain to replace the dredge, sinker block, and install piles for fixing. No need for large-scale civil engineering work.

  Even when dredging is performed, the number of implementation works can be reduced. And it becomes possible to lengthen the space | interval of the dredging work implemented next and the dredging work implemented next, generation | occurrence | production of muddy water can be decreased, and the load given to an environment can also be reduced.

  In addition, in the method of extending the jellyfish inflow preventing net according to the present invention, by using the jellyfish inflow preventing net expanding device described above, the guide pulley around which the development rope is wound is always rotated smoothly. The lifting of the jellyfish inflow prevention net from the sea and the expansion into the sea can be carried out easily and quickly.

When a jellyfish inflow prevention net is stretched in front of the water intake provided on the quay, a guide pulley is installed at a position away from the sea floor to wind the deployment rope provided on the jellyfish inflow prevention net on the seabed side. It is a side view which shows the state which is carrying out. When a jellyfish inflow prevention net is stretched in front of the water intake provided on the quay, a guide pulley is installed at a position away from the sea floor to wind the deployment rope provided on the jellyfish inflow prevention net on the seabed side. It is a front view which shows the state which is carrying out. When a jellyfish inflow prevention net is stretched in front of the water intake provided on the quay, a guide pulley is installed near the sea bottom to wind the deployment rope provided on the jellyfish inflow prevention net on the seabed side. It is a side view which shows a state. When a jellyfish inflow prevention net is stretched in front of the water intake provided on the quay, a guide pulley is installed near the sea bottom to wind the deployment rope provided on the jellyfish inflow prevention net on the seabed side. It is a front view which shows a state. It is a side view which shows the structure of the jellyfish intrusion prevention apparatus shown in patent document 1.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  The extension device for the jellyfish inflow prevention network A according to the present invention, as shown in FIGS. 1 and 2, prevents the jellyfish inflow prevention network A from extending in front of the water intake provided on the quay. The guide pulley 1 for winding the unfolding rope R1 provided in the net A on the seabed side is characterized by being installed at a position away from the seabed.

  On the intake side of the facility, as shown in FIG. 1, a predetermined curtain wall W is installed in the sea over the entire width of the intake, and the upper part of the curtain wall W is located on the sea, A work platform K is installed. A predetermined stanchion S is installed on the work platform K. A guide roller portion G is installed on the front side of the stanchion S.

  As shown in FIG. 2, the jellyfish inflow prevention network A deployed in the sea is configured by dividing the entire net into a plurality of pieces, and binding the divided nets with a rope and integrating them. . Further, in each of the divided nets, a development rope R1 is arranged at the lower edge on both sides of the net, and a pulling rope R2 is arranged at the upper edge on both sides of the net.

  As shown in FIG. 1, the unfolding rope R1 of the jellyfish inflow prevention net A is wound around a guide pulley 1 installed on the seabed side, and the end of the unfolding rope R1 is arranged on the stanchion S side on the sea. ing. At this time, the jellyfish inflow prevention net A is provided with the development ropes R1 at the lower edges on both sides of each of the divided nets, and has a plurality of development ropes R1 as a whole. As shown in FIG. 2, there are a plurality of guide pulleys 1 around which the plurality of development ropes R1 are wound.

  As shown in FIG. 1, the guide pulley 1 is attached to a concrete sinker block B installed on the seabed. Specifically, a semi-annular hook 2 is fixed to the sinker block B, and a chain 4 having a predetermined length is attached to the hook 2 via a shackle 3. Further, a shackle 3 is also disposed on the tip side of the chain 4, and a guide pulley 1 is attached via the shackle 3.

  The stanchion S is formed in a columnar shape having a predetermined length and is installed on the work platform K. As shown in FIG. 1, two vertical bars Sa and Sb are attached to the stanchion S on both sides of the cylinder.

And the lifting rope R2 arranged on the upper edge of the jellyfish inflow prevention net A is
It is guided to the horizontal bar Sa on the upper side of the stanchion S via the guide roller part G of the work platform K and is wound around the stanchion S. On the other hand, the unfolding rope R1 disposed on the lower edge of the jellyfish inflow prevention net A passes through the guide pulley 1 and then passes through the guide roller portion G of the work platform K to the lower horizontal bar of the stanchion S. Guided by Sb and wound around the stanchion S.

  When pulling up the jellyfish inflow preventing net A in the stretched state shown in FIG. 1, while pulling up the pulling rope R2 while loosening the deployment rope R1, with the jellyfish inflow preventing net A separated for each individual net, Each individual net is pulled up on the work platform K.

  When the jellyfish inflow prevention net A is extended in the sea, a plurality of individual nets are arranged on the work platform K, and adjacent nets are tied together with a rope and connected. After that, the deployment rope R1 is disposed at the lower edge of the net, and the pulling rope R2 is disposed at the upper edge of the net. After the deployment rope R1 is wound around the guide pulley 1, the end of the deployment rope R1 is pulled. Raise the jellyfish inflow prevention network A in front of the water intake.

  Then, in a state where the entire jellyfish inflow prevention net A is stretched at a predetermined position, the pulling rope R2 and the unfolding rope R1 are guided to the upper horizontal bar Sa and the lower horizontal bar Sb of the stanchion. It is wrapped around.

  In this way, as shown in FIG. 1, the jellyfish inflow prevention network A is extended on the front surface of the water intake, but the guide pulley 1 is attached to the sinker block B via the shackle 3 and the chain 4. The guide pulley 1 is installed at a position away from the seabed, specifically, at a position approximately 0.5 to 4 meters away from the seabed.

  For example, in the jellyfish inflow prevention network A implemented in a thermal power plant in the Tokyo Bay area, the opening size under the network is set to 2 m. In this case, the position of the guide pulley 1 is lower than this, and is about 1.7 meters away from the seabed.

  Assuming a new installation in which sludge or the like is not deposited on the seabed, the size of the opening under the net can be set to a minimum of 0.8 meters depending on conditions. In this case, the position of the pulley is about 0.5 meters away from the seabed.

  For this purpose, the position of the guide pulley 1 is set at a position at least 0.5 meters away from the seabed.

  Note that the guide pulley 1 may be installed at a position approximately 3 meters away from the seabed depending on the state of accumulation of sludge and the like on the seabed. Furthermore, you may install the guide pulley 1 in the position about 4 meters or more away from the seabed.

  Since the guide pulley 1 is attached to the sinker block B installed on the seabed via a chain 4 having a predetermined length, the length of the chain 4 is appropriately adjusted to The separation distance can be changed relatively easily.

  In addition, the present invention is not limited to the above-described embodiments, and all improvements and modifications within the scope that can achieve the object of the present invention are included in the present invention.

  The present invention extends a jellyfish inflow prevention network in front of a water intake to prevent the occurrence of floating jellyfish and other floating materials at the water intake of a facility that uses a large amount of seawater as cooling water. However, in addition to this, the present invention can be widely used when various network structures are stretched to be pulled up in various waters.

A ... Jellyfish inflow prevention network R1 ... Deployment rope R2 ... Lifting rope B ... Sinker block B1 ... Sinker S ... Stanchion S1 ... Winding means of deployment rope Sa ... Horizontal bar Sb ... Horizontal bar W ... Curtain wall K ... Work stand G ... Guide roller section 1 ... guide pulley 2 ... hook 3 ... shackle 4 ... chain 100 ... guide pulley

Claims (5)

A guide pulley that winds the deployment rope provided on the jellyfish inflow prevention net on the seabed side when the jellyfish inflow prevention net is extended in front of the water intake provided on the quay is installed at a position away from the seabed. A device for extending a jellyfish inflow prevention network, characterized by The apparatus for extending a jellyfish inflow preventing network according to claim 1, wherein the guide pulley is installed at a position approximately 0.5 to 4 meters away from the seabed. The apparatus for extending a jellyfish inflow prevention network according to claim 1, wherein the guide pulley is installed at a position approximately 3 meters away from the seabed. The jellyfish inflow prevention network expansion device according to any one of claims 1 to 3, wherein the guide pulley is attached to a sinker block installed on the seabed via a chain having a predetermined length. A method for extending a jellyfish inflow preventing net using the device for extending a jellyfish inflow preventing net according to claim 1.

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