JPH0212640Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a storage rack for storing stainless steel drums, and is useful when applied to a radioactive waste storage.

B. Summary of the invention In the storage rack according to the invention, the guide poles that form the rack are made of reinforced concrete, and both ends are buried in the concrete on the upper and lower floors of the storage room, so that both ends can be fixed even when there is thermal expansion. The natural frequency increases and earthquake resistance improves.Furthermore, by providing a stainless steel guide member with a protrusion along the length of the guide pole on the outer surface of the guide pole, the amount of stainless steel used can be reduced. However, the stainless steel drum does not come into direct contact with the rough outer surface of the concrete, and stainless steel contacts prevent damage to the drum and reduce friction.

C. Prior Art When storing radioactive waste, a common method is to hermetically store the waste in a hull drum or the like, and then store this hull drum in a circumscribed rack of a storage. Storage methods include underwater storage methods and air storage methods.The underwater storage method is effective as a countermeasure against heat generation of radioactive materials and as a water shield, and has the advantage that the interior can be clearly seen because of the water. Hull drums and the like are generally made of stainless steel. In addition, the rack was made of stainless steel in consideration of corrosion resistance against water, etc., not only for underwater storage but also for air storage.

However, when a rack such as a hull drum is manufactured from stainless steel by a method such as welding, it has the disadvantage that it becomes extremely expensive.

A conventional storage will be explained with reference to FIGS. 1 and 2. FIG. 1 shows a side cross-section of the storage. Radioactivity emitted from hull drums (hereinafter referred to as drums) 4 in the storage 1 is constantly shielded by plugs 3 on the upper shielding floor 2, and the upper shielding floor 2 is has become an amber area.

When storing the drum 4, the plug 3 is removed and placed into the storage compartment 1 where the rack is located. At this time, a shielding trap (not shown) is installed above the plug 3, and a cask (not shown) is placed on top of this shielding trap. (omitted), and the drum 4 is suspended from this cask and stored in the storage 1.

A rack is generally made by arranging a plurality of guide pipes 5, and when viewed from above, it looks like FIG. 2, and the drum 4 is inserted between the guide pipes 5 and housed therein. In this case, since the drum 4 is made of stainless steel as described above, the guide pipe 5
It was also made of stainless steel for corrosion resistance.

On the other hand, the upper shielding floor 2, the bottom floor 6, and the space between them are made of reinforced concrete, and the storage 1 as a whole has a box-like shape made of reinforced concrete to prevent leakage of radioactivity from the drum 4 to the outside world. In this case, since stainless steel and concrete have different expansion coefficients (including thermal time constants), it is not possible to fix the stainless steel guide pipe 5 to the floors 2 and 6 at the top and bottom, and generally, as shown in Fig. In addition to supporting the lower end, it was necessary to extend stainless steel support fittings 8 from the side wall 7 or between the guide pipes to make the guide pipes 5 resistant to earthquake response values. In addition, 9 in Fig. 1 is a damper, and 10
is a stainless steel lining.

D Problems to be Solved by the Invention In view of the above-mentioned prior art, the present invention aims to provide a storage rack that has excellent earthquake resistance and requires less stainless steel.

E. Means for Solving the Problems The configuration of the present invention that achieves the above-mentioned object is to install a reinforced concrete guide pole having a stainless steel guide member on the outer surface, and connect both ends of the guide pole to the upper and lower floors of the storage. Each of the guide members is provided by being embedded in concrete, and the guide member is provided with a convex portion along the longitudinal direction of the guide pole, and the guide pole forms a rack for storing a stainless steel drum between the guide poles. It is characterized by

Note that the guide member is designated by the reference numeral 12 in FIGS. 4 to 6.
There are things shown in .

F Function Since the main body of the guide pole is made of reinforced concrete, it will not be affected by thermal expansion even if both ends are buried in concrete on the floor above and below and both ends are fixed. By fixing both ends, the natural frequency increases and earthquake resistance improves.

Additionally, a stainless steel guide member provided on the outer surface of the guide pole prevents direct contact between the stainless steel drum and the rough outer surface of the concrete, resulting in stainless steel-to-stainless steel contact. This prevents damage to the drum and reduces friction.

Furthermore, the convex portion of the guide member acts as a shock absorber and absorbs the impact between the drum and the guide member.

Furthermore, since it is sufficient to provide the guide member only on the outer surface of the guide pole, the amount of stainless steel used is reduced.

G. Embodiment The present invention will be described below with reference to embodiments shown in FIGS. 3 to 6.

FIG. 3 shows an embodiment of the present invention, in which a reinforced concrete pipe or round bar with high earthquake resistance is used as the main body of the guide pole 11 to form a rack.

As described above, since the main body of the guide pole 11 is made of concrete, which is the same material as the wall material of the storage room 1, even if the temperature rises due to the heat generated by the drum 4, the difference in expansion between the two is small, and therefore the guide pole 11 can be embedded between the upper and lower floors 2 and 6. Furthermore, by welding the reinforcing bars above and below the guide pole 11 to the reinforcing bars of the upper and lower floors 2 and 6, the guide pole 11 can be reliably fixed to the upper and lower floors 2 and 6.

In this way, the guide pole 11 is fixed at both ends, and unlike the conventional guide pipe 5 shown in FIG. 1 whose lower end is fixed, the resonant frequency can be increased, which is extremely advantageous in terms of earthquake-resistant design. If necessary, a support metal fitting is provided in the middle between the guide poles 11 as shown in FIG.

By the way, while the drum 4 is made of stainless steel, the outer surface of the main body of the guide pole 11 is made of concrete and is rough, so there is a risk that the surface of the drum 4 will be damaged when the drum 4 is inserted (dropped).

Therefore, a plate-shaped guide member 12 made of stainless steel is provided on the outer surface of the main body of the guide pole 11. FIG. 4 shows a cross section of a guide pole 11 provided with a plate-shaped guide member 12, and the guide member 12 made of stainless steel is fixed to a metal fitting 13 embedded in the guide pole 11 with bolts 14. Welding may be used instead of bolting.

In this way, the stainless steel guide member 1 is attached to the outer surface of the reinforced concrete guide pole body.
2 to form the guide pole 11,
In addition to reducing the amount of stainless steel used and lowering costs, it is also extremely advantageous in terms of earthquake resistance, and the stainless steel drum 4 is different from the stainless steel guide member 12.
Since the drum 4 is in contact with the drum 4, the drum 4 will not be damaged and there is no risk of the radioactive material inside leaking out. It also reduces friction.

Further, as shown in FIGS. 4 to 6, a convex portion 12a is provided on the plate-shaped guide member 12 along the longitudinal direction of the guide pole 11. As shown in FIGS. FIG. 5 shows the appearance of such a guide pole 11, and FIG. 6 shows a cross section of the rack. In this way, the guide member 1
If the protrusion 12a is provided on the guide member 2, the protrusion 12a will act as a shock absorber, effectively absorbing the impact between the guide member 12 and the drum 4 when the drum is inserted (dropped) or during an earthquake. be able to. Additionally, friction is further reduced.

The main body of the guide pole 11 in FIG. 5 is a reinforced concrete pipe, but it may also be a round bar. However, a pipe can have a higher resonant frequency and is generally more advantageous.

Incidentally, in the above explanation, the guide pole 11 was assumed to be provided between the drums 4, but it is also possible to arrange the guide pole 11 as a thick guide pole as indicated by the broken line 17 in FIG. 2 so as to touch the four adjacent drums. Also good. In this case, guide members 12 having convex portions 12a are provided at four locations.

H. Effects of the invention As explained above, the rack of the invention has the following effects.

(1) Since the guide pole forming the rack is made of reinforced concrete with a stainless steel guide member provided on its outer surface, the amount of stainless steel used is small and the cost is low.

(2) Since the racks inside the storage warehouse are also made of concrete, there is little difference in the amount of expansion due to heat generated from the drums, and for this reason, it is possible to completely embed the guide poles of the racks in the floors above and below. By supporting both ends, the natural frequency increases and earthquake resistance improves.

(3) During an earthquake, the drum vibrates inside the rack,
Even if the drum easily collides with this vibration, the resistance against this is much greater than in the past.

(4) Furthermore, since the drum is made of stainless steel, the guide member on the outer surface of the reinforced concrete guide pole is also made of stainless steel, so the drum does not come into direct contact with the rough surface of the concrete, and stainless steel Since the drum surface is in contact with the drum, there is no damage to the drum surface and friction is reduced. Moreover, the guide member has a convex portion, and this convex portion serves as a shock absorber and absorbs the impact between the drum and the guide member.

[Brief explanation of the drawing]

1 and 2 relate to the prior art, in which FIG. 1 is a side sectional view of the storage, FIG. 2 is a plan sectional view, and FIG.
6 to 6 relate to an embodiment of the present invention, FIG. 3 is a side sectional view of the embodiment, FIG. 4 is a cross-sectional view of an example of the guide pole, FIG. 5 is a perspective view, and FIG. FIG. In the drawing, 1 is a storage, 2 is an upper shielding floor, 3 is a plug, 4 is a drum, 6 is a bottom floor, 7 is a side wall, 8 is a support fitting, 9 is a damper, 11 is a guide pole, 1
2 is a plate-shaped guide member, 12a is a convex portion thereof, 13
is an embedded metal fitting, and 14 is a bolt.

Claims (1)

[Scope of utility model registration request] A guide pole made of reinforced concrete having a guide member made of stainless steel on its outer surface is provided with both ends of the guide pole buried in concrete on the upper and lower floors of the storage, and the guide member is arranged in the longitudinal direction of the guide pole. A storage rack comprising a convex portion along the guide poles and forming a rack for storing a stainless steel drum between the guide poles.