JP6515430B2 - Dredging method of the bottom of ponds contaminated with radioactive materials - Google Patents

Description

  The present invention relates to a method of dredging bottoms such as ponds contaminated with radioactive material.

  Countermeasures for soil contamination by radioactive cesium diffused by the accident at the Fukushima Daiichi Nuclear Power Station in March 2011 are urgently needed. In particular, soil that has adsorbed radioactive cesium flows into the water area due to rainfall and accumulates on the bottom of closed water areas such as lakes and ponds, resulting in high concentrations of radioactive cesium. And when such a closed water area is a reservoir for agriculture, it recontaminates a cultivated land, and when it is a fishery place, it will cause pollution of a marine product and an urgent measure is called for.

  It has been found that mud pollution at the bottom of the water is highly contaminated at the surface and low at the deep. Therefore, a considerable amount of polluted mud can be removed by scooping a few cm to a dozen or so cm deep of the surface layer of the bottom of the water by means of a grinder. Patent Document 1 discloses a conventional eyelid device.

JP 2008-31745 A

  By the way, when collecting polluted mud on the bottom of the water, the most careful thing is to prevent the mud from being rolled up and diffused in the water. That is, it must be done so as not to diffuse the radioactive cesium which has settled on the bottom of the water into the water. However, there is a problem that such a request can not be responded to by the conventional method using a crucible device. That is, in the conventional dredging method using a conventional dredger as described in Patent Document 1, dredging is performed by moving the dredger by installing the dredging device on the dredger, but movement of the dredger is a screw etc. For example, when the pond or the like is shallow, there is a risk that the bottom of the water will be rolled up by the operation of the screw.

  Therefore, in order to solve the above problems, the inventors of the present invention have developed a method of dredging a bottom of a pond or the like contaminated with a radioactive substance described below. That is, as a first invention, the central water window section straddles the rails laid on the two opposing sides of a boat having a central water window section having a U-shaped or mouth-shaped central water window section made of float and A wedge method by a wedge device comprising a wedge portion having a wedge intake port at a lowermost portion movable in a first direction which is a parallel direction or / and a second direction which is perpendicular to a rail, which is a radioactive material A step of preparing the float device on the bottom of the contaminated pond, a fixing step of fixing the ridge device to the pond, and a fixing step, the collar portion is fixed in the central water window portion in the first direction Or suggesting a method of dredging the bottom of a pond or the like contaminated with radioactive material for removing the polluted portion of the bottom of a pond or the like, having a forward direction chute step of moving in a second direction to make forward wrinkles .

  Also, as a second invention, a backward direction step in which the heel region is moved in the reverse direction to the forward direction along the forward direction ridge line created by the forward direction wedge step to reverse direction wrinkle step And a method of dredging a bottom of a radioactive material-contaminated pond or the like according to the first invention described in the first invention.

  Further, as a third invention, by repeating the forward direction dredging step and the reverse direction dredging step in the same manner, there is provided a third step including a repeating step of uniformly crawling over a contaminated portion of the bottom located below the central water window such as pond. The method of dredging a bottom of a pond or the like contaminated with radioactive material according to the second invention is proposed.

  Further, as a fourth invention, a fixing release step of releasing the fixing of the weir to the pond or the like after the flooding of the bottom of the pond or the like located under the central water window by the repeating step is completed, and the unlocking step Moving the dredging device so that the central water window portion is disposed in a region adjacent to the dredged completion central water window portion, which is the central water window portion of the pond where the dredging is completed; The method of dredging a bottom of a pond or the like contaminated with radioactive material according to the third invention is proposed.

  As a fifth aspect of the invention, the preparing step connects a float carrying sub-step for carrying a plurality of rectangular floats around a pond or the like, and a float carried in the float carrying step in a U shape or a mouth shape. From the first consisting of a connecting sub-step to be a bridge, a rail-laying sub-step to lay the rail on the bridge-connected, and a buttock-arranging sub-step to place the buttocks on the laid rail A method of dredging a bottom of a radioactive material-contaminated pond or the like according to any one of the fourth inventions is proposed.

  As a sixth aspect of the present invention, the fixing step includes a rope suspension sub-step for passing a rope into the air across a pond or the like, and a rope-mediated fixing sub-step for securing the weir device via the suspended rope. A method of dredging a bottom of a pond or the like contaminated with a radioactive substance according to any one of the first to fifth inventions is proposed.

  Also, as a seventh invention, the weir device moving step is a fifth invention or a sixth invention dependent on the fourth invention or the fourth invention having a rope-mediated moving sub step for moving the weir device through the suspended rope. The present invention provides a method of dredging a bottom of a pond or the like contaminated with radioactive material as described in the invention.

  By using the above-mentioned moxibustion method, it becomes possible to perform moxibustion without rolling up radioactive material accumulated in the bottom of a pond or the like in water.

A diagram showing an example of the construction of a method of dredging the bottom of a pond or the like contaminated with radioactive material The figure which shows an example of the processing flow of the dredging method of the bottom of the pond etc. which were contaminated with the radioactive material of Embodiment 1. The figure which shows an example of the processing flow of the dredging method of the bottom of the pond etc. which were contaminated with the radioactive material of Embodiment 2. A schematic diagram showing an example of the reverse direction chewing step The figure which shows an example of the processing flow of the dredging method of the bottom of the pond etc. which were contaminated with the radioactive material of Embodiment 3. Outline diagram showing an example of the repeating step The figure which shows an example of the processing flow of the method of dredging method of the bottom of the pond etc. which were contaminated with the radioactive material of Embodiment 4. A schematic diagram showing an example of movement of the eyebrow apparatus movement step The figure which shows an example of the processing flow of the bottom dredging method of the pond etc. which were contaminated with the radioactive material of Embodiment 5. The figure which shows an example of the processing flow of the bottom dredging method of the pond etc. which were contaminated with the radioactive material of Embodiment 6. The figure which shows an example of the processing flow of the bottom dredging method of the pond etc. which were contaminated with the radioactive material of Embodiment 7. Schematic diagram showing an example of a rope intervention movement substep Outline diagram showing an example of the connection sub-step A schematic diagram showing another example of the rope intervention movement substep

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The mutual relationship between each embodiment and the claims is as follows. First, the first embodiment mainly corresponds to claim 1 and the like. The second embodiment mainly corresponds to claim 2 and the like. The third embodiment mainly corresponds to claim 3 and the like. The fourth embodiment mainly corresponds to the fourth aspect and the like. The fifth embodiment mainly corresponds to the fifth aspect and the like. The sixth embodiment mainly corresponds to the sixth aspect and the like. The seventh embodiment mainly corresponds to the seventh aspect and the like. The present invention is not limited to these embodiments at all, and can be implemented in various modes without departing from the scope of the invention.
<< First Embodiment >>
<Overview>

  The present embodiment relates to a method of dredging a bottom of a pond or the like contaminated with radioactive material.

  FIG. 1 shows an example of the construction of the method of dredging a bottom of a pond or the like contaminated with radioactive material according to the present invention. (A) shows a side view and (b) shows a top view. In the method of dredging a bottom of a pond or the like contaminated with radioactive materials according to the present invention, a rail (0103) laid on a base vessel (0102) composed of floats (0101) has a weir intake at its bottom. An eyebrow device (0106) is provided with an eyebrow portion (0105) to which (0104) is attached. The weir device is fixed to the pond or the like using a rope (0113) etc., and is movable in a first direction (0107) parallel to the rail and / or a second direction (0108) perpendicular to the rail The radioactive material (0109) accumulated in the bottom of the pond or the like from the weir intake port is weired by the movement of the weir device. Earth and sand containing radioactive materials and the like that have been flooded are stored in a tank (0111) through a pipe (0110) and strictly managed so as not to cause a radiation leak. The floats are connected in a U-shape or a U-shape to form a vessel having a central water window (0112). In addition, the rails are laid on the two opposing sides of the barge.

The tank is not particularly limited as long as radiation leaks due to radioactive materials stored in the tank do not occur, but turbid water near the sediment as well as soil containing radioactive materials from the weir intake port It is necessary to make the tank large as it is because it is taken in and transported to the tank. Therefore, for example, if a flocculating agent is added to the turbid water transported to the tank, the coagulant is added and filtered, and the floc of radioactive material is precipitated and concentrated to configure the tank with a sedimentation separation device that reduces the volume of the turbid water, It is preferable because the tank can be made compact. In addition, since earth and sand and turbid water are stored in the tank, it is preferable that the tank is installed on land near a water such as a pond, but it is not particularly limited.
<Flow of processing>

  FIG. 2 is a view showing an example of the processing flow of the bottom weir method such as a pond contaminated with radioactive material according to the first embodiment. For example, the method of dredging a bottom of a pond or the like contaminated with radioactive material according to the present embodiment includes “preparation step” (S0201), “fixing step” (S0202), and “forward direction dredging step” (S0203). Become. Each step will be described in detail below.

  In the "preparation step" (S0201), the weir is floated on a pond or the like whose bottom is contaminated with radioactive material. The important point in this step is that the weir device is installed so as not to roll up the radioactive material accumulated in the bottom of the pond into the water. The radioactive substance is mostly captured between the layers of clay and silt (generally about 4 μm to less than 0.06 mm in size) in the bottom of the water, and the radioactive substance is present in a strongly adsorbed state in clay, and the radioactive substance is fine particles. If the clay and silt to which the radioactive substance has been adsorbed diffuse into the water, the radioactive contamination may be further expanded. Therefore, by floating and installing the dredging device on the water surface of the pond, it is possible to minimize the situation of rolling up the radioactive material accumulated in the bottom of the pond. In addition, it is preferable to, for example, float the dredger on the water surface of the pond whose bottom has been contaminated with radioactive material beforehand and place the dredge device thereon (for details in Embodiment 5). To explain).

  In the "fixing step" (S0202), the weir device is fixed to a pond or the like. The important point in this step is that, similar to the preparation step, the weir device is fixed so that the radioactive material accumulated in the bottom of the pond is not rolled up in water. Therefore, in “fixing the weir device to a pond or the like”, it is preferable that the weir device be fixed using, for example, a rope suspended in the air of the pond (described in detail in Embodiment 6).

In the "forward direction chewing step" (S0203), after being fixed in the fixing step, the heel portion is moved in the central water window portion in the first direction or the second direction to make a wrinkle in the forward direction. It is not preferable to move the buttocks using a screw-like power when moving "in the first or second direction". The reason is that operating the screw causes the bottom of the pond or other radioactive material to be wound up. Therefore, for example, as in the example shown in FIG. 1, the wheel is provided on the buttocks and the buttocks are installed on the rail, and the buttocks are moved by rotating the wheels, etc. It is preferred that the chewing be done without. In addition, the forward direction flooding step may be repeatedly performed, and flooding may be performed on the entire contaminated portion located below the central water window such as a pond (described in detail in the second or third embodiment).
<Effect>

By implementing the method of dredging the bottom of a pond or the like contaminated with radioactive material according to this embodiment, it is possible to perform dredging without winding up the radioactive substance accumulated on the bottom of the pond or the like.
<< Embodiment 2 >>
<Overview>

The method of dredging the bottom of a pond or the like contaminated with radioactive material according to this embodiment is basically the same as that of Embodiment 1, but the side thereof along the forward weir line weired in the forward weir step. The difference is that moving the buttocks in the direction opposite to the forward direction causes the region to wrinkle in the reverse direction.
<Flow of processing>

  FIG. 3 is a view showing an example of the processing flow of the bottom dredging method such as a pond contaminated with radioactive material according to the second embodiment. For example, the method of dredging a bottom of a pond or the like contaminated with radioactive material according to the present embodiment includes "preparation step" (S0301), "fixing step" (S0302), "forward direction dredging step" (S0303), "reverse direction And “step” (S0304). Since the steps from S0301 to S0303 are the same as those described in the first embodiment, the reverse direction eyebrows step which has not been described above will be described below.

  In the "reverse direction chewing step" (S0304), the side region is moved along the forward direction chewing line in the forward direction chewing step to move the ridge portion in the direction opposite to the forward direction to make a reverse direction wrinkle. Since the direction of movement of the buttocks is different between the forward direction chewing step and the reverse direction chewing step, it is necessary to rotate the heel intake port to perform the reverse direction chewing step after the end of the forward direction chewing step. Preferably, the boat is configured to be able to rotate even with the anchorage vessel fixed.

  FIG. 4 is a schematic view showing an example of the reverse direction eyebrow step. (A) shows the outline of the eyebrow method when performing only the forward direction eyelid step of Embodiment 1 as a comparative example, and (b) shows the outline of the eyebrow method including the reverse direction eyebrow step of Embodiment 2. In addition, in order to demonstrate easily, it does not show in figure about structures other than the rail (0402) and the weir intake port (0403) laid on the barge (0401) and the barge. For example, in (a), when trying to look at the side region (0412) along the forward eyelid line (0411) after the forward eyelid step, after the end of the forward eyelid step, for example, as shown by the arrow (0413) After moving the buttocks to the direction 浚 渫 step start side, it is necessary to perform the forward direction 浚 渫 step again. Then, when moving the buttocks, if you move the weir inlet away from the bottom of the pond or the like, there is a possibility that the radioactive material accumulated in the bottom of the pond or the like may be rolled up. After the end of the process, it is necessary to pull up the bag intake port and move the buttocks. In addition, when the water depth of the pond or the like is shallow, the bottom of the weir intake port and the bottom of the pond can not be separated sufficiently, and there is a possibility that the radioactive substance accumulated on the bottom of the pond or the like is wound up. Therefore, in (b), by performing the backward chewing step after the forward chewing step, the movement of the buttocks is, for example, the minimum movement as shown by the arrow (0413), and the wrinkles can be efficiently performed. it can. Furthermore, it is possible to prevent the situation where the radioactive material accumulated in the bottom of the pond etc. is rolled up by the movement of the buttocks.

  In addition, it is preferable that the position which performs a reverse direction eyebrows step overlaps the position which performs eyebrows by a forward direction eyebrows step, and the one part. That is, it is preferable that a part of the side portions of the forward ridge line (the left and right sides with respect to the ridge direction) is also wrinkled in the reverse ridge step. In the vicinity of the side portion of the crucible intake port, it may not be possible to perform sufficiently in one crucible, and by using the above-mentioned crucible method, it is possible to prevent the leakage of the crucible.

In addition, the reverse weir step may be repeated along with the forward weir step until weir of the entire contaminated portion located below the central water window such as a pond is performed (this will be described in detail in the third embodiment).
<Effect>

By carrying out the method of dredging the bottom of the pond or the like contaminated with the radioactive substance of the present embodiment, it becomes possible to carry out dredging efficiently without rolling up the radioactive substance accumulated on the bottom of the pond or the like.
<< Third Embodiment >>
<Overview>

The method of dredging the bottom of a pond or the like contaminated with radioactive material according to the present embodiment is basically the same as that of Embodiment 2, but the point is that the forward dredging step and the reverse dredging step are similarly repeated. It is different.
<Flow of processing>

  FIG. 5 is a diagram showing an example of the processing flow of the bottom weir method such as a pond contaminated with radioactive material according to the third embodiment. For example, the method of dredging a bottom of a pond or the like contaminated with radioactive material according to the present embodiment includes “preparation step” (S0501), “fixing step” (S0502), “forward direction dredging step” (S0503), “reverse direction Step (S0504), "Repetitive Step" (S0505). Since the steps from S0501 to S0504 are the same as those described in the first and second embodiments, repetitive steps not described above will be described below.

  In the "repetitive step" (S0505), the contamination in the bottom of the pond or the like located under the central water window portion is evenly swept by repeating the forward dredging step and the reverse dredging step in the same manner.

  FIG. 6 is a schematic view showing an example of the repeating step. In addition, in order to demonstrate easily, it does not show in figure about structures other than the rail (0602) and the weir intake port (0603) laid on the barge (0601) and the barge. In the forward and backward steps, the entire bottom contaminated area located below the central water window can not be overlooked (the first step: 0611). By repeating the step and the reverse direction step (the second step: 0612, the third step: 0613, the fourth step: 0, 614), it is possible to evenly overturn the entire contaminated portion.

In addition, when the flooding in the whole of the contaminated portion is completed in the forward direction chewing step, the wrinkle may be completed without performing the reverse direction chewing step. In the example shown in the figure, only the chewing by the forward direction chewing step is performed at the fourth chewing. In addition, when an obstacle (such as rock) is present on the water surface of a pond or the like, the forward dredging step and the reverse dredging step are performed avoiding that portion.
<Effect>

By practicing the method of dredging the bottom of a pond or the like contaminated with radioactive material according to this embodiment, contamination of the bottom located below the central water window of the pond or the like without rolling up the radioactive substance accumulated on the bottom of the pond or the like It becomes possible to insult the part evenly.
<< Embodiment 4 >>
<Overview>

The method of dredging the bottom of a pond or the like contaminated with radioactive material according to this embodiment is basically the same as that of the third embodiment, but the portion of the bottom of the bottom of a pond or the like located below the central water window by repeated steps. After the completion of the dredging, release the anchorage of the dredging device to the pond etc. so that the central water window portion will be placed in the area adjacent to the dredging completed central water window portion which is the central water window portion of the pond where the dredging is completed. The difference is that the weir device is moved.
<Flow of processing>

  FIG. 7 is a diagram showing an example of the processing flow of the bottom weir method such as a pond contaminated with radioactive material according to the fourth embodiment. For example, the method of dredging the bottom of a pond or the like contaminated with radioactive materials according to the present embodiment includes "preparation step" (S0701), "fixing step" (S0702), "forward direction dredging step" (S0703), "reverse direction Step (S0704), "repeating step" (S0705), "fixing release step" (S0706), and "wrinkle device moving step" (S0707). Since the steps from S0701 to S0705 are the same as those described in the first to third embodiments, the following will describe the unlocking step and the eyebrow apparatus moving step, which have not been described so far.

  In the "unlocking step" (S0706), after the flooding of the bottom of the pond or the like located below the central water window is completed by the repeating step, the anchoring of the weir device to the pond or the like is canceled. By releasing the fixation of the weir device to the pond etc., it becomes possible to move the weir device in the weir device moving step described later.

  In the "scissor device transfer step" (S0707), after the unlocking step, the central water window portion is disposed in the area adjacent to the weir completion central water window portion which is the central water window portion of the pond where the weir has been completed. Move the equipment. The important point in this step is that the radioactive material accumulated in the bottom of the pond or the like is not rolled up in water when moving the weir device. Therefore, for example, in order to move the weir device, it is preferable to move the weir device via a suspended rope (described in detail in the seventh embodiment).

  FIG. 8 is a schematic view showing an example of the eyebrow apparatus moving step. In addition, about the structure other than the central water window part (0801) of a weir apparatus and the water surface (0802) of a pond is not shown in figure for ease of explanation. In the weir method from step S0701 to step S0705 described in the third embodiment, it is possible to see only the contaminated portion of the bottom located below the central water window such as a pond. Although it is necessary to cover the entire surface of the water surface with the central water window to cover the entire bottom of a large pond or the like using the method described in the third embodiment, this method is not realistic. Therefore, when the weir below the central water window in the position of (A) is completed, the weir completion center which is the central water window portion in the position of (A) where the weir is completed by the releasing step and the weir moving step. For example, the dredging device is moved and dredging is performed so that the central water window portion is disposed at the position (B) so that the central water window portion is disposed in the area adjacent to the water window portion. Furthermore, when the flooding below the central water window part at the position of (B) is completed, the flooding apparatus so that the central water window part is disposed at the position of (C) by the fixing release step and the flooding apparatus moving step again. By repeating the process of moving the pots and carrying out the dredging, it is possible to trap the radioactive substances accumulated in the entire bottom even if the area of the pond or the like is large.

In addition, when moving the weir device after completion of the weir below the central water window part by the weir device at a certain position, move it so that a part of the arrangement of the central water window part overlaps before and after movement. Is preferred. That is, to explain with the example shown in the figure, the central water window portion is partially overlapped at the position of (A) and the position of (B) (or the position of (B) and the position of (C)), For example, when performing dredging at the position of (B) after dredging under the central water window portion is completed at the position of (A), the part of the portion where the dredging is already completed at the position of (A) is again (B) Do chopsticks also at the position of. Then, as described in the second embodiment, it is possible to prevent soot leakage near the side of the soot intake port.
<Effect>

By implementing the method of dredging the bottom of a pond or the like contaminated with radioactive material according to the present embodiment, the entire bottom of the pond or the like can be dredged without rolling up the radioactive substance accumulated on the bottom of the pond or the like. It is possible to
<< Embodiment 5 >>
<Overview>

This embodiment is basically the same as the method for dredging the bottom of a pond or the like contaminated with radioactive materials in the first to fourth embodiments, but as preparation for the dredging device, a plurality of rectangular parallelepiped floats are carried around the pond etc. The difference is that the floats are connected in a U-shape or a mouth-shape to form a base ship, and the rails are laid on the connected base ship and the buttocks are placed on the laid rails.
<Flow of processing>

  FIG. 9 is a view showing an example of the processing flow of the bottom weir method such as a pond contaminated with radioactive material according to the fifth embodiment. For example, the method of dredging a bottom of a pond or the like contaminated with radioactive material according to the present embodiment includes "preparation step" (S0901), "fixing step" (S0902), "forward direction dredging step" (S0903), "reverse direction Step (S0904), “Repetitive step” (S0905), “Fix release step” (S0906), “Moving device moving step” (S0907), and preparation step is “Float transport sub step” (S0911) ), "Connection substep" (S0912), "rail laying substep" (S0913), and "buttock arrangement substep" (S0914). The steps S0904 to S0907 may not be performed. Below, the float conveyance substep, the connection substep, the rail laying substep, and the buttock arrangement substep which have not been described up to now will be described.

  In the "float carrying sub-step" (S0911), a plurality of rectangular floats are carried around a pond or the like. "Float" is used as a charter vessel for mounting the buttocks as described later. A large-sized facility may not be able to be transported, as ponds contaminated with radioactive materials may be considered to be at the back of the mountain. Therefore, the size of the float is preferably a size (for example, 2W × 1D × 0.5H (m) or the like) or a weight (for example, 5 kg or the like) which can be carried by a person. In addition, it is preferable that not only the float but also the equipment such as the buttocks have a size and weight that can be transported to the back of the mountain.

  In the "connection sub-step" (S0912), the float carried in the float carrying step is connected in a U-shape or a mouth-shape to form a boat. The connecting substep may be performed on the surface of a pond or the like, or on land. The "U-shaped or U-shaped" is used to provide a central water window in the center of the vessel. In addition, when the central water window is provided at the center of the boat as a U-shaped or a U-shaped, and the weir device is configured, the weir two-dimensionally crawls the bottom below the central water window such as pond. It becomes possible. In the present invention, the U-shape or the U-shape includes, for example, a shape in which only one side has a short length among the four sides of the vessel in the case of a U-shape, It is not limited to the configuration that is strictly U-shaped or B-shaped when viewed.

  FIG. 13 is a schematic view showing an example of the connection sub-step. (A) shows the perspective view regarding connection of a float, (b) shows the top view of the connected float. For example, the floats (1301) may be connected to each other by providing a recess (1302) on the side of the float and inserting the fastener (1303) in the recess to connect the floats with each other.

  In the "rail laying sub-step" (S0913), the rails are laid on the connected barge. The rails shall be laid on the two opposing sides of the vessel. Then, the buttocks will be placed on the rails on the two sides, and it becomes possible to move the buttocks stably even if floating on the water surface such as a pond. The rail laying substep may be performed on the surface of a water such as a pond or on land.

In the “arrangement placement sub-step” (S0914), the buttocks are placed on the laid rails.
<Effect>

By performing the preparation step described in the present embodiment, it is possible to chew the radioactive material accumulated in the bottom of the pond or the like without winding it up. In addition, even if the pond or the like is at the back of the mountain, equipment can be transported by human power, and a dredging device can be configured to perform dredging.
<< Embodiment 6 >>
<Overview>

This embodiment is basically the same as the dredging method for the bottom of a pond or the like contaminated with radioactive materials in the first to fifth embodiments, but in the fixing step, a rope is delivered to the air across the pond etc. The point of fixing the weir device via the rope is different.
<Flow of processing>

  FIG. 10 is a diagram showing an example of the processing flow of the bottom weir method such as a pond contaminated with radioactive material according to the sixth embodiment. For example, the method of dredging a bottom of a pond or the like contaminated with radioactive material according to the present embodiment includes “preparation step” (S1001), “fixing step” (S1002), “forward direction dredging step” (S1003), “reverse direction Step (S1004), “Repetitive step” (S1005), “Fix release step” (S1006), “Moving device moving step” (S1007), and the preparation step is “Float transport sub step” (S1011) ), “Link sub-step” (S1012), “rail laying sub-step” (S1013), “butar placement sub-step” (S1014), and the fixing step is “rope suspension sub-step” (S1021), “ Rope interposition fixing sub-step "(S1022). Note that steps S1004 to S1007 and / or steps S1012 to S1014 may not be included. Below, the rope suspension substep which has not been described up to now, and the rope intervening fixing substep will be described.

  In the "rope suspension sub-step" (S1021), a rope is passed in the air across a pond or the like. The anchor device is fixed using the rope delivered to the air in this step. For example, if a method of driving a pile or the like is used when fixing the weir device to a pond etc., radioactive materials accumulated on the bottom of the pond or the like around the pile will be rolled up, and the damage due to radioactivity will spread further. There is fear. Therefore, by using the rope delivered to the air for fixing the weir, it is possible to prevent the radioactive material accumulated at the bottom of the pond etc from being wound up.

In the "rope-mediated fixing substep" (S1022), the weir device is fixed via the suspended rope. In the case where the chewing method of the present embodiment includes the fixing release step and the chewing device moving step, it is more preferable to be configured so that the fixation of the chewing device can be easily released.
<Effect>

By performing the fixing step described in the present embodiment, it becomes possible to fix the weir apparatus without winding up the radioactive substance accumulated in the bottom of the pond or the like.
<< Embodiment 7 >>
<Overview>

The method of dredging the bottom of a pond or the like contaminated with radioactive material according to this embodiment is basically the same as the dredging method of the bottom of a pond or the like contaminated with radioactive material described in the first to sixth embodiments. The difference is that the weir device is moved through the rope suspended in the weir device moving step.
<Flow of processing>

  FIG. 11 is a diagram showing an example of the processing flow of the bottom dredging method such as a pond contaminated with radioactive material according to the seventh embodiment. For example, the method of dredging a bottom of a pond or the like contaminated with radioactive material according to the present embodiment includes “preparation step” (S1101), “fixing step” (S1102), “forward direction dredging step” (S1103), “reverse direction Step (S1104), “Repetitive step” (S1105), “Fix release step” (S1106), “Moving device moving step” (S1107), and preparation step is “Float transport sub step” (S1111) ), “Link sub-step” (S1112), “rail laying sub-step” (S1113), “butar placement sub-step” (S1114), and the fixing step is “rope suspension sub-step” (S1121), “ And the rope device moving step comprises the steps of Sub-step "and (S1131), consisting of. Note that steps S1104 to S1107 and / or steps S1111 to S1114 and / or steps S1121 to S1122 may not be included. Below, the rope intervention movement substep which has not been described up to now will be described.

  In the "rope-mediated movement substep" (S1131), the weir device is moved via the suspended rope. Since the dredging device floats on the water surface of a pond or the like, for example, “moving the dredging device” may be configured to move the dredging device fixed to the rope by pulling up the rope or pulling it. The rope device may be moved by fixing the rope and winding the rope device. By taking this configuration, it is possible to prevent the situation where the radioactive material accumulated on the bottom of the pond etc. is rolled up when moving the weir device.

  FIG. 12 is a schematic view showing an example of a rope intervention movement substep. The pipes and tanks of the weir apparatus shown in FIG. 1 are not shown for the purpose of explanation. As an example of the rope intervention movement sub-step, for example, it is assumed that the weir apparatus (1201) is fixed by the rope (1203) which is passed over the poles (1202) installed on the opposite shore. In (a), when the bottom of the bottom (1204) under the central water window such as a pond is finished, when the pole rolls up the rope in the direction of the arrow (1205), the weir device fixed to the rope is in the same direction It can be moved (b) and the bottom (1206) of the central water window can be flooded in a new position.

FIG. 14 is a schematic view showing another example of the rope intervention movement substep. In the example shown to this figure, the weir apparatus (1402) floated on a pond can be moved using the rope (1401) which fixed at least one end to the pond equal bank. Specifically, for example, two winches (1403) are provided on the dredger boat, the rope is wound around the winch, and a pillar is erected on the shore such as a pond before and after the portion where the dredging device is to be moved. It is possible to operate the winch to move the chewing apparatus. Note that one of the two winches will wind up the rope and the other winch will release the rope. In addition, install the winches at the four corners of the charter vessel and hold the end of the rope fixed on each side of the pond, and move freely in the pond by the amount of winding and the amount of winch. , It becomes possible to arrange a barge at a desired position. In that case, the winch is more preferably such that the winding cylinder can be freely reoriented. The pipes and tanks of the weir apparatus shown in FIG. 1 are not shown for the purpose of explanation.
<Effect>

  By performing the preparation step described in the present embodiment, it becomes possible to move the weir without moving up the radioactive material accumulated in the bottom of the pond or the like when moving the weir.

0101: Float 0102: Base ship 0103: Rail 0104: Rod intake port 0105: Rod portion 0106: First device 0108: First direction 0109: Radioactive material 0110: Pipe 0111: Tank 0112: Central water window 0113: Rope

Claims (6)

A first direction or a direction parallel to the rail at the central water window over the rails laid on the two opposing sides of a boat having a central water window consisting of a float and a U-shaped or mouth-shaped central water window A wedge method by a wedge device provided with a wedge portion having a wedge inlet at a lowermost portion movable in a second direction which is vertical to and / or horizontal to the rails and
A preparation step of floating the dredging device in a pond or the like whose bottom is contaminated with radioactive material,
A fixing step for fixing the weir device to a pond etc.
After being fixed in the fixing step, the wedge part is moved in the central water window part in the first direction or the second direction to make a wrinkle in the forward direction;
A reverse direction step of moving the buttocks in a direction opposite to the forward direction along the forward direction ridge line created by the forward direction ridge step to reverse the direction ridge;
Have
The reverse weir step includes a portion of the sides of the forward weir line to conduct weiring; bottom weirs such as ponds contaminated with radioactive material to remove bottom contaminating parts such as ponds Method. The radioactive substance according to claim 1, further comprising a repeating step of uniformly covering the bottom contaminated portion located under the central water window such as a pond by repeating the forward chewing step and the backward chewing step in the same manner. Bottom dredging method such as contaminated ponds. A releasing step for releasing the fixing of the weir device to the pond etc. after the flooding of the bottom of the pond or the like located under the central water window part is completed by the repeating step;
Moving the dredging device to move the dredging device so that the central water window portion is disposed in a region adjacent to the dredged completion central water window portion, which is the central water window portion of the pond where the dredging has been completed;
3. A method of dredging a bottom of a radioactive material-contaminated pond according to claim 2, wherein The preparation step is
The float transport substep which carries several rectangular floats around a pond etc.,
A substep of connecting the floats carried in the step of carrying the float in a U-shape or a mouth-like manner to form a boat;
Rail laying sub-steps for laying the rails on a connected barge,
A buttock placement substep for placing the buttocks on the laid rails,
4. A method of dredging a bottom of a pond or the like contaminated with radioactive material according to any one of claims 1 to 3, comprising the steps of The fixed step is
Rope suspension sub-step which passes rope to the air across ponds,
A rope interposed fixing substep for fixing the weir device via a suspended rope;
A method of dredging a bottom of a pond or the like contaminated with radioactive material according to any one of claims 1 to 4, comprising the steps of 6. A radioactive material contaminated pond according to claim 4 or 5 , wherein the weir device transfer step comprises a rope-mediated transfer substep for moving the weir device through a suspended rope. How to use the bottom of the etc.

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