JP2010276577A - Drum fixing tool and drum fixing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight drum fixing method, capable of fixing drums stably for a long period, fixing drums stored already without repiling, and simply and surely preventing fall/drop of drums by an earthquake, or the like, or the collapse of stacked drums. <P>SOLUTION: A drum fixing tool includes a long-tool body made of a metal whose one end is to be removably mounted on a pallet; a pressing body mounted on the other end of the tool body, for pressing a drum in contact with one point on the upper surface of the drum; and further, a pressing means for generating pushing pressure of the pressing body, by pulling the pressing body in the pallet direction by the tool body, one end of the tool body is mounted on the pallet on the uppermost stage or the lowermost stage, and the pressing body is brought into contact with the upper surface of a drum on the uppermost stage among stacked drums to press the drum. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drum can fixing jig and a drum can fixing method capable of preventing a drum can from falling and falling during a large earthquake by fixing a drum can containing radioactive waste that is stacked in one or more stages. .

  Waste generated in the radiation control area of a nuclear facility is stored in a sealed state in a drum can or the like in order to prevent the spread of radioactive contamination (for example, Patent Document 1). In addition, radioactive waste, except for some of them, is prohibited from being taken out of the office, so it is stored in a dedicated warehouse in the office.

  As a method of storing drums containing radioactive waste in a warehouse, it is common to stack four drums on a single pallet in order to increase storage efficiency, but an earthquake has occurred. In this case, the drum can located on the upper stage may fall over due to shaking and fall. Specifically, in the 2007 Chuetsu-oki earthquake in Niigata Prefecture, an event occurred in which multiple stacks of drums collapsed and some of the radioactive waste stored inside leaked out of the drums. is doing. When radioactive waste stored in a drum can leaks, radioactive contamination spreads. Therefore, socially, it is desired to improve the earthquake resistance of the storage of radioactive waste.

  Current methods for preventing the drum can from falling and falling include winding a lashing belt around the drum can and securing it, placing a pallet on the drum can and securing it with a wire, etc. The method of storing in the pallet to which the box and the frame were attached is mentioned. However, these methods have the following problems.

  In the method of lashing a lashing belt or the like around a drum can, the lashing belt is loosened when the drum can move a little due to an earthquake or the like, and the effect of the lashing is significantly reduced. Further, since the belt gradually stretches when the lashing belt is tensioned for a long period of time, there is a problem that regular tightening is necessary and continuous maintenance is required. Further, since radioactive waste is stored for several decades, it is desirable that the function is not impaired even in the event of a fire, but there is a problem that the lashing belt cannot withstand the high temperatures during a fire.

  Next, in the case of a method in which a pallet is placed on a drum can and secured with a wire or the like, since the weight of the pallet is about 40 kg, it is difficult to carry it manually to the upper portion of the drum can. In addition, the wire is hung so that a plurality of drums can be bundled in the horizontal direction. However, when a large number of drums are stored, it is difficult for the operator to go to the back pallet, especially two or more stages. When stacked, it is difficult to hang the wire on the bottom. For example, when a wire is placed for each block of drum cans stored in several tens of pallets, the wire becomes long, so that the elongation becomes large, and there is a possibility that a gap in which the drum can falls or falls is generated. In addition, since the force applied to the wire is large, it is necessary to use a thick wire with extremely poor workability or to reinforce the place where the wire is hung.

Next, in the case of storing drum cans in pallets with boxes and frames attached, pallets with boxes and frames that can withstand the weight of heavy drums containing radioactive waste (about 400 kg for heavy items) are commercially available. Because it is not, it needs to be specially made. Moreover, since the dimension of a pallet becomes large by attaching a box or a frame, there exists a problem that storage efficiency falls.
Furthermore, in the case of drums that are already stored, in order to replace the pallet, the stored drums must be reloaded, which is difficult to implement.

JP-A-7-198895

  In view of the above problems, the present invention can stably fix a drum can over a long period of time, and can fix a drum can that has already been stored without being reloaded, and can be carried manually. Drum can fixing jig reduced in weight, and using this drum can fixing jig to easily and reliably prevent the drum can from falling or falling due to an earthquake or the like, or the stacked drum cans from collapsing It is an object of the present invention to provide a drum can fixing method capable of achieving the above.

  As a result of diligent study, the inventors of the present invention have a drum can by a simple method in which a pressing body is brought into contact with one point on the upper surface of the drum can by using a drum can fixing jig having a long jig body and a pressing body. Has been found to be sufficiently stable and fixed, and the present invention has been completed. Hereinafter, the invention of each claim will be described.

The invention described in claim 1
A drum can fixing jig for fixing a drum for storing radioactive waste placed on a pallet,
A long jig body, one end of which is detachably attached to the pallet;
It is attached to the other end of the jig body, and comprises a pressing body that contacts the upper surface of the drum can at one point and presses the drum can against the pallet,
Furthermore, the jig main body includes a pressing means for generating a pressing force of the pressing body by pulling the pressing body in the direction of the pallet.

  In the first aspect of the invention, since the drum can be fixed by the pressing force generated by pulling the pressing body by the long jig body, the pressing force is hardly lowered and the drum can is kept for a long time. In order to fix the drum can to the pallet by pulling the pressing body in contact with the upper surface of the drum can in the direction of the pallet, the drum can falls down due to an earthquake etc. It is possible to provide a drum can fixing jig optimal for fixing a radioactive waste storage drum that can easily and reliably prevent the stacked drums from collapsing.

  In addition, since a long jig body is used, the gap between already stored drum cans can be easily inserted and attached to the pallet, and the already stored drum cans can be fixed without reloading. be able to. Furthermore, since one end of the jig main body can be detachably attached to the pallet, for example, when the number of drum cans to be stored increases, the attachment location can be changed to an arbitrary location as necessary.

  Moreover, since it is set as the structure which contacts and presses on the upper surface of a drum can at one point, without pressing a press body over the whole upper surface of a drum can, a press body can be reduced in weight. In addition to the fact that the jig body can be easily reduced in weight, the entire fixing jig can be reduced in weight, so that the drum can fixing jig can be easily carried to the uppermost drum can stacked. Can do.

  For example, the pressing body is made into a cross shape, and the pressing body is brought into contact with each of the four drum cans placed on one pallet and pressed, so that one drum can fixing jig 4 The drum cans can be fixed at the same time.

  In addition, examples of the “long jig body” mentioned here include a rod-like object and a string-like object such as a chain or a wire. Moreover, it is preferable that a jig | tool main body and a press body are the metal which has the intensity | strength which can maintain a traction and a press for a long period of time, and is excellent in fire resistance. The “pallet” here includes a skid-type pallet.

The invention described in claim 2
The pressing means is
A male screw portion provided at the other end of the jig body;
A through hole formed in the pressing body;
2. The drum can fixing jig according to claim 1, further comprising a nut inserted into the through hole and screwed into the male screw portion protruding from the through hole.

  In the invention according to claim 2, in a state where the pressing body is in contact with the upper surface of the drum can, the pressing body is pulled in the direction of the pallet by a simple operation of rotating the nut and screwing the drum can from above. Since it can be pressed, the drum can be fixed easily.

The invention according to claim 3
A drum can fixing method for fixing a drum for radioactive waste storage placed on a pallet using the drum can fixing jig according to claim 1 or 2,
Attach one end of the jig body to the pallet,
A drum can fixing method, wherein a pressing body attached to the other end of the jig body is brought into contact with the upper surface of the drum can at one point and then pulled in the direction of the pallet to fix the drum can to the pallet. It is.

  According to the invention described in claim 3, the radioactive waste storage drum can placed on the pallet can be stably pressed and fixed over a long period of time. Further, since the drum can fixing jig is lightweight, the drum can can be fixed easily and efficiently.

The invention according to claim 4
4. The drum can according to claim 3, wherein the pallet and the drum can placed thereon are stacked, and the uppermost drum can is fixed to the pallet on which the uppermost drum can is placed. It is a fixing method.

  In the invention described in claim 4, the uppermost drum can is fixed to prevent a fall or fall due to an earthquake, and among the stacked drum cans, only the uppermost drum can is fixed to the uppermost pallet. With this simple operation, all the stacked drums can be prevented from falling, falling or collapsing.

  That is, as a result of examining the case where the drum can is damaged most at the time of the earthquake, it has been concluded that the uppermost drum can falls due to the shaking of the earthquake. In the present invention, since the uppermost drum can is directly fixed, the uppermost drum can is securely fixed. In addition, the drums loaded on the lower stage other than the uppermost stage are subject to the gravity of the drums and pallets loaded on the upper stage, so that they do not fall, fall or collapse without being fixed. By fixing only the drum cans, the entire stacked drum cans can be prevented from falling, falling or collapsing due to an earthquake. For this reason, the simple operation of fixing only the uppermost drum can to the uppermost pallet can prevent all the stacked drum cans from falling, falling or collapsing due to an earthquake.

The invention described in claim 5
The pallet and the drum cans placed thereon are stacked, one end of the jig body of the drum can fixing jig is attached to the lowest pallet, and the pressing body is located at the uppermost stage. The drum can fixing method according to claim 3, wherein the drum can be pressed by being brought into contact with a point on the upper surface of the drum.

  In the invention according to claim 5, the pressing body of the drum can fixing jig is brought into contact with the drum can positioned at the uppermost stage, and the jig body is attached to the lowermost pallet and pressed, so that Since all the drums up to the lower stage are fixed with a drum can fixing jig, it is particularly effective in preventing the stacked drums from falling, falling or collapsing. Moreover, since one end of the jig body is simply attached to the lowermost pallet and the pressing body is only brought into contact with the uppermost drum can and pressed, it can be easily performed on already stacked drums.

  According to the present invention, a drum can can be stably fixed over a long period of time, and a drum can already stored can be easily fixed without being reloaded, and the weight can be reduced by hand. A jig for fixing a drum can that can be provided can be provided. Further, it is possible to provide a drum can fixing method that can easily and surely prevent the drum cans from falling or dropping due to an earthquake or the like, or the stacked drum cans from collapsing.

It is a perspective view of the jig for drum can fixing concerning one embodiment of the present invention. It is a perspective view which shows a part which decomposed | disassembled the drum can fixing jig | tool shown in FIG. It is a perspective view which shows the state which attached the jig for drum can fixing shown in FIG. 1 to the pallet. FIG. 4 is an enlarged view of a portion X in FIG. 3. It is a perspective view which shows the state which fixed the drum can mounted on the pallet using the drum can fixing jig | tool shown in FIG. It is a top view which shows the state which fixed the drum can mounted on the pallet using the drum can fixing jig | tool shown in FIG. It is a front view which shows the state which fixed the drum can mounted on the pallet using the drum can fixing jig | tool shown in FIG. It is a figure which shows the method of fixing a drum can to a pallet using the jig for drum can fixing shown in FIG. It is a figure which shows the fixing method of the drum can which concerns on one embodiment of this invention. It is a figure which shows the fixing method of the drum can which concerns on one embodiment of this invention.

  Hereinafter, the present invention will be described based on embodiments. Note that the present invention is not limited to the following embodiments. Various modifications can be made to the following embodiments within the same and equivalent scope as the present invention.

1. Description of Drum Can Fixing Jig This embodiment is an example of a drum can fixing jig using a metal rod-shaped jig main body. First, a drum can fixing jig according to an embodiment of the present invention will be described. 1 is a perspective view of a drum can fixing jig according to an embodiment of the present invention. FIG. 2 is a perspective view showing a part of the drum can fixing jig shown in FIG. FIG. 4 is a perspective view showing a state where the drum can fixing jig shown in FIG. 1 is attached to a pallet, and FIG. 4 is an enlarged view of a portion X in FIG.

  In FIG. 1, a drum can fixing jig 1 includes a metal rod-shaped jig main body 1 ′, a metal hook 3 formed at one end (lower end in the figure) of the jig main body 1 ′, and a jig main body. A metal pressing body 2 attached to the other end (upper end in the figure) of 1 ′, a male screw 4 and a nut 6 are provided.

  As shown in FIG. 1, the hook 3 is formed by bending a plate material upward, and a slit-like groove 31 for avoiding the lattice of the pallet is formed in the center.

  Further, as shown in FIG. 2, the pressing body 2 has four pressing arms 21 having a cross shape in plan view, and hook claws 22 project from the lower surface near the tip of each pressing arm 21, A through hole 5 having a size through which the jig body 1 ′ can be inserted is provided in the center of the body 2 in the vertical direction.

  The pressing means of the drum can fixing jig 1 according to the present embodiment includes a pressing body 2, a male screw portion 4 provided on the upper portion of the jig main body 1 ′ and inserted through the through hole 5, and a penetration of the pressing body 2. The nut 6 is screwed into the male screw portion 4 protruding upward from the hole 5, and the hook 3. 3 and 4, the hook 3 is locked to the lattice P1 of the pallet P, and the presser arm 21 of the pressing body 2 shown in FIGS. 1 and 2 is placed on the upper surface of the drum can (not shown). When the nut 6 is tightened in the abutted state, the pressing body 2 is pulled in the direction of the pallet by the jig main body 1 ′ to generate a pressing force that presses the drum can from above, and the drum can and the pallet come into close contact with each other. Since the diameter of the drum can is about 60 cm, the drum can can be fixed if the length of the presser arm 21 of the pressing body 2 is about 50 cm.

2. Drum can fixing using a drum can fixing jig a. Next, a basic fixing structure of a drum can using a drum can fixing jig will be described. 5, 6, and 7 are a perspective view, a plan view, and a front view showing a state where the drum can D placed on the pallet is fixed using the drum can fixing jig 1, respectively. However, FIGS. 6 and 7 are partial views. As shown in FIG. 5, four drums D are placed around the center of the pallet P on the pallet P formed by connecting metal lattices P1, and as shown in FIG. Four pressing arms 21 of the pressing body 2 provided in a cross shape in both directions A and B are brought into contact with and pressed on the upper surface of the drum can D. Further, as shown in FIG. 7, the hook 3 provided at one end of the jig main body 1 ′ is locked to P1 of the pallet P, and these drums can be obtained by screwing the nut 6 into the male screw portion 4. D is pressed by the pressing body 2 and fixed to the pallet P.

  As shown in FIG. 5, the upper lid D <b> 1 of the drum can D is provided with the protruding portion D <b> 2, so that the drum can fixed using the drum can fixing jig 1 is firmly fixed to the pallet P.

B. Next, a basic method for fixing a drum can using the drum can fixing jig will be described. FIG. 8 is a view showing a method of fixing the drum can to the pallet using the drum can fixing jig shown in FIG. The drum can is fixed to the pallet by the following operation.

(A) The drum can fixing jig 1 is inserted from above into the gap between the drum cans D placed on the pallet P as shown in FIG. Next, the drum can fixing jig 1 is pulled up as shown by an arrow b, and the hook 3 is hooked on the lattice P1 of the pallet P and locked.
(B) On the other hand, one presser arm 21 of the pressing body 2 of the drum can fixing jig A is positioned on the upper surface D1 of one drum can D, and the ridge portion of the upper surface D1 is formed by the hooking claws 22 of the presser arm 21. In a state where the inner side of D2 is hooked, the four drums D are pressed by the pressing body 2.
(C) Next, the nut 6 is tightened as indicated by an arrow c, and the upper surfaces D1 of the four drums D are simultaneously pressed by the pressing body 2.

  Thus, in the state where the four drum cans D are fixed to the pallet P by the drum can fixing jig 1, the contact point between the pressing body 2 of the drum can fixing jig A and the drum can D is one point per drum can D. Become.

  In this way, the drum can fixing jig 1 according to the present embodiment presses one point on the upper surface of one drum can D with one presser arm 21, and therefore, when a complicated shake due to an earthquake is given, the drum can There was a concern that D would be detached from the drum can fixing jig 1, but it was confirmed that the seismic resistance was confirmed by conducting a vibration in a form close to the actual storage condition of the drum D by a test using a shaker. It was confirmed that the drum D did not detach from the drum can fixing jig 1 even when a shake corresponding to a seismic intensity of 6 was applied.

  As the portion to be pressed on the upper surface D1 of the drum can D, the ridge portion D2 having a high strength as in the present embodiment is preferable. In addition, when the drum can fixing jig 1 is attached to the peripheral portion of the pallet, it is necessary to attach a plurality of drum can fixing jigs 1 for balance. On the other hand, when the drum can fixing jig 1 is attached to a position close to the center of the pallet, the drum can can be fixed by the single drum can fixing jig 1. For this reason, in order to reduce the weight of the drum can fixing jig 1, it is preferable to attach the drum can fixing jig 1 to a position close to the center of the pallet P. However, if it is difficult to attach the drum can fixing jig A because the drum can D is located at the center of the pallet P, there is no problem even if it is attached at a position shifted from the center. Depending on circumstances, the drum fixing jig 1 may be attached to the outer peripheral portion of the pallet P.

3. Fixing method for stacked drums a. Method for Fixing Uppermost Drum Can to Uppermost Pallet Next, a method for fixing stacked drum cans will be described. FIG. 9 is a diagram showing a method for fixing drum cans according to an embodiment of the present invention, and is a perspective view showing an example of a method for fixing drum cans stacked in a plurality of stages. The example shown in FIG. 9 is an example in which only the uppermost drum can is fixed to the uppermost pallet using the drum can fixing jig 1 among the three cans stacked.

  In this way, by fixing only the uppermost drum can among the plurality of stacked cans, it is possible to prevent the entire stacked can, including the lower one, from falling, falling or collapsing due to an earthquake. it can. In addition, since only the uppermost drum cans need to be fixed, the drums already stacked can be easily fixed, and can be fixed using the one-stage drum can fixing jig 1. In addition, it is preferable to arrange | position the frame material F around for every block like FIG.

B. FIG. 10 is a diagram showing a method of fixing a drum can according to an embodiment of the present invention, and shows another example of a method of fixing a plurality of stacked drum cans. FIG. In the example shown in FIG. 10, the jig body 1 ′ of the drum can fixing jig 1 is elongated and inserted through the gap between the uppermost drum cans to the lowermost skid type pallet S, and the jig body 1 ′ By hooking the hook 3 to the skid-type pallet S and pulling the pressing body 2 to press the uppermost drum can D, all the drum cans D in a plurality of stages are fixed.

  Thereby, the whole drum can stacked can be fixed by a simple operation. Further, since the jig body 1 'is elongated and inserted through the gap between the uppermost drum cans to the lowermost skid type pallet S, the already stacked drum cans can be easily fixed.

  In the above embodiment, the present invention has been described by taking a drum can fixing jig using a rod-shaped jig body as an example. However, instead of the rod-shaped jig body, for example, a metal chain or wire such as stainless steel is used. Even when a string-like jig body is used, the same effect as when a rod-like jig body is used can be exhibited.

DESCRIPTION OF SYMBOLS 1 Drum can fixing jig 1 'Jig main body 2 Press body 3 Hook 4 Male screw part 5 Through hole 6 Nut 21 Presser arm 22 Hook claw 31 Hook groove D Drum can D1 Upper lid D2 Strike part F Frame material P Pallet P1 Grid S Skid type pallet

Claims (5)

A drum can fixing jig for fixing a drum for storing radioactive waste placed on a pallet,
A long jig body, one end of which is detachably attached to the pallet;
It is attached to the other end of the jig body, and comprises a pressing body that contacts the upper surface of the drum can at one point and presses the drum can against the pallet,
Furthermore, the jig main body includes a pressing means for generating a pressing force of the pressing body by pulling the pressing body in the direction of the pallet. The pressing means is
A male screw portion provided at the other end of the jig body;
A through hole formed in the pressing body;
The drum can fixing jig according to claim 1, further comprising a nut inserted into the through hole and screwed into the male screw portion protruding from the through hole. A drum can fixing method for fixing a drum for radioactive waste storage placed on a pallet using the drum can fixing jig according to claim 1 or 2,
Attach one end of the jig body to the pallet,
A drum can fixing method, wherein a pressing body attached to the other end of the jig body is brought into contact with the upper surface of the drum can at one point and then pulled in the direction of the pallet to fix the drum can to the pallet. .   4. The drum can according to claim 3, wherein the pallet and the drum can placed thereon are stacked, and the uppermost drum can is fixed to the pallet on which the uppermost drum can is placed. Fixing method.   The pallet and the drum cans placed thereon are stacked, one end of the jig body of the drum can fixing jig is attached to the lowest pallet, and the pressing body is located at the uppermost stage. 4. The drum can fixing method according to claim 3, wherein the drum can be pressed by being brought into contact with one point on the upper surface of the drum.

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