JP2543102Y2 - Cask fall prevention device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing a cask, which is a container for transporting spent nuclear fuel, from falling over to fix the cask in an upright posture.

[0002]

2. Description of the Related Art Conventionally, when a spent fuel nuclear fuel cask is fixed in an upright posture (upright state), as shown in FIG. And four lugs (protrusions) 2 attached at regular intervals to each other, and a lug (bracket) 4 with a gantry protruding from the outer periphery of a fixed gantry 3 on which the cask body 1 in an upright position is placed. In between, fixed wires 6 with turnbuckles 5 interposed were stretched. Further, a fixing wire 6 with a turnbuckle may be connected between the upper lug 2 and a fixing lug (bracket) provided on a wall surface.

[0003]

However, in the case where the fixing wire 6 is used as described above, the fixing wire 6 becomes an obstacle to reduce the work efficiency around the cask, or the fixing wire of the cask arranged adjacent to the cask. There is a problem that interference between the six occurs. In addition, since the cask has a height of 4 to 5 m, attaching the fixing wire 6 to the upper lug 2 is a work at a high place, which is inefficient and highly dangerous.

[0004] The present invention solves the above-mentioned problems, and does not become an obstacle for workers or cause interference between fixed ropes.
An object of the present invention is to provide a cask overturn prevention device that can easily and reliably fix a cask without working at a high place.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a cask overturn prevention device according to the present invention is provided with a plurality of buffer mounting lugs protruding around a lower portion of a cask main body. And a fixing bracket which can be mounted via a fixing bolt on a fixing stand on which the cask is mounted, and a fixing which can be fitted into the pin hole on a lower surface of a locking portion formed at an upper end of the fixing metal. The pins are protruded.

[0006]

According to the above construction, the fixing pin provided on the fixing bracket is fitted from above into the pin hole formed in the bumper mounting projection, and the fixing bracket is mounted on the fixing base with the fixing bolt. The cask can be fixed. Therefore, a fixed rope extending outward from the cask is unnecessary, there is no interference, and mounting work can be easily performed without work at height. Also, since the protruding piece uses the one provided to attach the buffer when the cask is placed horizontally,
It is not necessary to attach a new member for fixing to the cask.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a cask overturn prevention device according to the present invention will be described below with reference to FIGS. The same members as those in the related art are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 2, reference numeral 11 denotes a fixing bracket for the cask main body 1 which can be detachably attached to the fixing stand 3 via fixing bolts 22. The mounting bracket 11 is provided below the cask main body 1 at regular intervals in the circumferential direction. Lugs (locking pieces) 21.

[0010] As shown in FIG.
A base 12, a column 13 a erected on the base 12, and a locking portion 13 b protruding forward from an upper end of the column 13 a.
And a fixing pin 14 protruding from the lower surface of the locking portion 13b. The base 12 has an elongated hole 1 for mounting the fixing bolt 22 penetrating vertically.
5 are formed in the front-rear direction, and U-shaped handles 16 are attached to both side surfaces of the support 13a.

The lug 21 for mounting the shock absorber is a protruding piece for mounting a shock absorber to be mounted on the cask body 1 when the cask body 1 is transferred in a horizontal state, and is a pin hole 21a into which the fixing pin 14 can be fitted. Are formed in the vertical direction, and the lug 21 for attaching the buffer body and the locking portion 1 of the fixing bracket 11 are formed.
The cushioning material 23 is interposed between 3b. Further, a bolt hole 24 for mounting the fixing bolt 22 is formed at a position of the fixed base 3 which can correspond to the buffer mounting lug 21.

According to the above construction, the cask main body 1 is placed on the fixed base 3 in an upright posture, and the bolt holes 2 of the fixed base 3 are
4 corresponds to the lug 21 for mounting the shock absorber. Then, the fixing pins 14 of the fixing fittings 11 are fitted into the pin holes 21a of the lugs 21 for mounting the buffer via the buffer members 23, respectively.
The fixing bolt 22 is attached to the bolt hole 24 of the fixing base 3 through the long hole 15 of the base 12 and tightened. Thereby, the cask main body 1 can be securely fixed to the fixed base 3, and the cask main body 1 in the upright posture can be prevented from falling down. Therefore, since the fixing wire is not used unlike the related art, there is no interference between the wires and the worker, and there is no work at a high place. Therefore, the cask main body 1 in the upright posture can be efficiently and easily fixed and released. It does not disturb the surrounding work.

[0012]

As described above, according to the cask tipping prevention device of the present invention, the fixing pins of the fixing fittings are fitted into the pin holes formed in the protruding pieces from above, and the fixing fittings are fixed by the fixing bolts. The cask in the upright posture can be securely fixed by attaching the to the fixed base. Therefore, a fixed rope extending outward from the cask is unnecessary, there is no interference, and mounting work can be easily performed without work at height. In addition, since the protruding piece is provided for attaching the buffer when the cask is placed horizontally and conveyed, it is not necessary to attach a new member for fixing to the cask.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a fixture showing an embodiment of a cask overturn prevention device according to the present invention.

FIG. 2 is an overall side view of the cask.

FIG. 3 is a side view showing a conventional cask overturn prevention device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cask main body 3 Fixed base 11 Fixing bracket 12 Base 13 Inverted L-shaped member 13a Column 13b Locking part 14 Fixing pin 15 Long hole 21 Buffer mounting lug 21a Pin hole 22 Fixing bolt 24 Bolt hole

Continuation of the front page (56) References JP-A 60-170800 (JP, U) JP-A 62-104197 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] A plurality of shock absorber mounting projections protruding around a lower portion of the cask main body, wherein pin holes having an upper surface opening are formed;
A fixing bracket that can be mounted via a fixing bolt is provided on a fixing stand on which the cask is placed, and a fixing pin that can be fitted into the pin hole is protrudingly provided on a lower surface of a locking portion formed at an upper end of the fixing metal. A cask overturn prevention device, characterized in that: