JP3244971B2 - Cask lashing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for securing a disk, which is a storage container for spent nuclear fuel and the like, and more particularly to a device for securing a disk to a mounting base of a transport body such as a transport ship or a transport vehicle.

[0002]

2. Description of the Related Art Conventionally, in order to secure a disk in a carrier or transport vehicle for spent nuclear fuel, a disk fixed on a dedicated platform is installed on a predetermined mounting platform such as a carrier, and then the platform is secured by bolts and nuts. Generally, a method of manually tightening the mounting table is used. In addition, there is also a method in which a cask is installed in a stopper welded and fixed on all sides of the mounting table, and a wedge is manually driven into the gap between the cask base and the stopper to fix the base to the mounting base. Now it's done.

In the case of the above-described bolt and nut tightening method, the pedestal is provided with bolt holes each having a diameter of usually 50 mm on both sides of the bottom of the pedestal, seven locations on one side, a total of 14 locations in the longitudinal direction of the pedestal. On the other hand, a similar bolt hole is also provided on the loading platform in the hold of the carrier, and a quay crane is used to lift the cask fixed to the gantry to a predetermined position in the ship, and to determine the position of the bolt hole between the gantry and the loading platform. After matching, M45 bolts and nuts are attached and tightened.

[0004] Similar bolt holes are also provided on a mounting table of a transport vehicle for transporting a cask by land, and the gantry is secured by the same procedure as in a transport ship. In addition, instead of the above-described securing device by manual operation, a securing device that can be remotely operated has been proposed, but has not been put to practical use yet.

[0005]

However, since the cask is a heavy object having a weight of about 100 tons or more including the dedicated frame, the mounting holes and the bolt holes of the frame are aligned when the cask is loaded and secured. In this work, auxiliary ropes are attached to the four sides of the casks while supporting the weight of the casks with a quay crane, and many workers pull the work from all sides. This operation is inefficient and requires a lot of labor. In addition, the size of the bolts is large, and considerable effort is required to install and tighten the 14 bolts. In addition, there is also a problem that the work space is limited because a large number of casks are mounted side by side on a ship, and it is necessary to pay attention to safety.

[0006] Furthermore, the cask contains radioactive materials. Since the above-mentioned work is performed manually by approaching the cask, it is necessary to alternately engage a large number of workers in order to control the exposure of workers. There is also a problem. The present invention is intended to solve such a problem, and a rack to which a cask is fixed can be secured by remote control from a place remote from a mounting base of a carrier ship body. The purpose is to provide.

[0007]

In order to achieve the above-mentioned object, a cask securing device according to the present invention comprises a cask for securing a frame to which a cask can be fixed to a mounting base of a transport body such as a carrier or a transport vehicle. In the lashing device, the gantry has a function as a positioning means when the gantry is placed on the gantry and is mounted on the gantry. And a guide / stopper having a function as a side stopper for restricting the movement in the left-right direction, and slidably fitted in a groove provided on a mounting base parallel to the width direction of the above-described mask, and mounted on the mounting base. the cradle and the clamp device having the same time clampable pair of clamping hardware from both sides in the width direction of the Kiyasuku that provided. Soshi
In a state where the cradle is clamped by the clamp device, a longitudinal horizontal force acting on the cask is larger than a frictional resistance of a clamp surface formed by the clamp hardware and a clamp seat provided on the cradle. The clamp slides on the clamp surface, and the clamp clamps the mount against a horizontal force acting on the cask in a direction parallel to the groove, which is larger than a frictional resistance between the clamp and the mount. The gantry slides along the groove with the gantry together with the gantry, and the gantry slid by the bidirectional horizontal force acting on the cask is supported by the guide / stopper, and the overturning moment acting on the cask rotation of the gantry lift has been configured to be suppressed by the clamping device.

[0008] Further , the clamp device may be configured to move the axis line to the key.
Arranged parallel to the center line in the width direction of the yask and in the coaxial line direction
Hydraulic cylinder mounted on the mounting table so that it can move to
The hydraulic cylinder is mounted on a rod without hydraulic pressure.
With a mechanical lock mechanism that can hold
Then, the pair of clamp hardware is locked by the hydraulic cylinder.
Attached to the hydraulic side and the head side.
The pair of rods are extended and retracted to
When the clamp hardware is configured to be slidable at the same time,
is there.

[0009]

In the above-described cask lashing device of the present invention,
Lift the fixed cask with a quay crane and mount it
When lowering, use the bottoms of the stand as guides and stoppers
It is lowered while being guided and landed.

[0010] provided appropriate number on mounting base rack stand sides, and the clamping device in the mounting base enables fitted in a groove provided slide clamp hardware and the hydraulic cylinder or the like, floating is Kiyasuku after implantation, or overturning To prevent
The hydraulic cylinder is operated by remote control.

The hydraulic cylinder is provided with a mechanical lock mechanism capable of securing the rod without hydraulic pressure. A pair of clamps facing each other are attached to the rod side and the head side of the hydraulic cylinder to extend and retract the cylinder rod. By doing so, both clamp hardware slide (slide) in the securing or releasing direction at the same time.

The guide and stopper also serves as a side stopper of the gantry, and a horizontal force acting on the gantry to slide the gantry is supported by the guide and stopper. That is, the clamp hardware of the clamp device slides against the horizontal force acting on the cask in the longitudinal direction until the frame abuts the guide / stopper when the frictional resistance of the clamp surface is exceeded, and in the width direction of the cask. For the applied horizontal force, after clamping the gantry, reduce the hydraulic pressure of the hydraulic cylinder to no pressure, hold the cylinder rod and equalize the movement of the pair of clamps facing each other, and change the clamp state according to the direction of the applied force. Following the movement of the gantry while keeping it, it slides until it comes into contact with the guide / stopper, and is finally supported by the guide / stopper.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a key securing device according to an embodiment of the present invention. FIG. 2 is a perspective view of the guide / stopper. FIG. 3 is a partial sectional side view showing a clamping state of the clamping device, FIG. 4 is a partial partial sectional view showing a state before clamping of the clamping device, FIG. 5 is a front view of the clamping device, and FIG. FIG.

In this embodiment, there is shown a case in which a gantry 3 to which a cask 4 is fixed is fixed to a mounting table 7 provided in a hold of a cask carrier, as an example. 1, the guide and side stopper 1
And the clamp device 2, and such a securing device is disposed on all sides of the gantry 3. In the example shown in FIG. 1, two sets of the clamp devices 2 are provided on one side. However, the clamp devices 2 are additionally arranged according to the magnitude of the force acting on the gantry 3.

Also, a plurality of guide / side stoppers 1 (hereinafter referred to as "stoppers") are separately provided in the longitudinal direction (direction of arrow 5) and the width direction (direction of arrow 6) of the disk 4. You can also. In this embodiment, the stoppers 1 are arranged so as to oppose the four corners of the gantry 3, and each stopper 1 functions as a guide and a stopper in both directions of arrows 6 and 5 of the gantry 3 so as to function as a vertical L-shape in plan view. It has a wall 1a.

The guide / side stopper 1 is mounted on a mounting table 7.
The clamp device 2 is slidably fitted in a groove 8 formed in the mounting table 7 and parallel to the width direction 6.

The cask 4 is lifted by a quay crane (not shown) in a state where the cask 4 is fixed to the gantry 3, carried into the hold, and guided above the stopper 1 by a suitable guide device (not shown). Come. As shown in FIG. 2, the stopper 1 has an L-shaped vertical wall 1a whose upper side is open to the outside, and the bottom of the gantry 3 is formed on all sides as the cask 4 is hung down on the mounting table 7. The landing is performed while being guided by the vertical wall 1a of the stopper 1. Reference numeral 1b in FIG. 2 indicates a bottom wall of the stopper 1.

FIGS. 3 to 6 show an example of the construction of the clamp device. The clamp device 2 is composed of a pair of clamp hardware 10, a hydraulic cylinder 12 and a connecting rod 13 which slide the clamp hardware 10 at the same time. In addition, a clamp seat 11 is provided at each of both ends in the longitudinal direction of the gantry 3 corresponding to the pair of clamp hardware 10.

The clamp hardware 10 is connected to the rod side and the head side of the hydraulic cylinder 12 by pins 14 facing each other. A connection rod 13 is provided on the head side according to the distance between the clamp hardware 10 facing the head, and is connected by a pin 14. The hydraulic cylinder 12 is desirably provided with a mechanical lock mechanism in which the cylinder rod is held in a state where the hydraulic pressure is zero. However, the cylinder rod is fixed by hydraulic control of the hydraulic cylinder using a normal hydraulic cylinder. A mechanism may be used.

The hydraulic cylinder 12 has its axis parallel to the center line in the width direction of the cask 4 and, while being supported by a slide plate 17 provided below the mounting table 7, supports the weight of the hydraulic cylinder 12 while extending the cylinder rod. It is mounted so as to be slidable on the slide plate 17 in the axial direction with the reloading. Note that rollers may be provided on the mounting table side or the hydraulic cylinder instead of the slide plate.

In the above-described configuration, when working pressure oil is fed into the head side oil inlet 15 of the hydraulic cylinder 12 from a working oil pressure source (not shown), the cylinder rod is extended and the pair of clamp hardware 10 facing each other is moved outward (arrow 6). ), And stops at the outer end 9 of the groove 8 provided on the mounting table 7 in parallel with the longitudinal direction of the cask 4. FIG. 4 shows a state in which, after the opposing clamp hardware 10 has been slid outward, the disk 4 fixed to the gantry 3 has been landed in the manner described above.

Next, the operating pressure oil is sent to the rod-side oil inlet 16 of the hydraulic cylinder 12, the cylinder rod is contracted, and the clamp seat 11 is pressed down by the clamp hardware 10 to be clamped (the state of FIG. 3). At this time, since the inclined surface 10a of the clamp hardware 10 presses the inclined surface 11a of the clamp seat 11 from above, the gantry 3 is pressed against the mounting table 7 by the vertical component force. The pressing force is applied to the mounting table 7 by the clamp hardware.
It is supported via a sliding surface 10b with the shaft 10.

As a result, the gantry 3 does not rise even if a tipping moment acts on the gantry 3 during clamping. Subsequently, the hydraulic pressure is reduced to zero on both the rod side and the head side, and the clamp is held by firmly holding the cylinder rod.

When a horizontal force which tries to move the cask 4 acts in the longitudinal direction of the cask (in the direction of arrow 5) when the clamp device is in the clamp state, the horizontal force is applied to the clamp hardware 10 and the clamp seat 11 If the force is greater than the frictional resistance of the clamp surface, the slide occurs on the clamp surface, and the gantry 3 slides on the mount 7 until the edge of the gantry 3 hits the stopper 1.

For a horizontal force acting on the disk 4 in the width direction (direction of arrow 6), which is greater than the frictional resistance of the sliding surface 10b, the pair of opposed clamps 10 is notched with the gantry 3 while the clamped state is maintained. 8 slides and follows. Note that the above-described bidirectional movement of the gantry 3 occurs because there is a slight gap between the gantry 3 and the stopper 1 even after landing.

In the clamp state in which the cylinder rod is fixed, the movement of the opposed clamp hardware 10 is made the same through the hydraulic cylinder 12, the connecting rod 13, and the like.
While keeping the clamped state, it follows the movement of the gantry 3 in the width direction of the mask. As a method of holding the cylinder rod, a cylinder rod holding circuit may be provided in the hydraulic circuit and controlled using a normal hydraulic cylinder in addition to the mechanical lock type hydraulic cylinder described above.

As described above, in this embodiment, the gantry 3 is guided when the cask is loaded into the ship by the guide / side stopper 1 fixed to the four sides of the mounting position of the cabin by the welding or the like. That is, when the cask 4 (the gantry 3) touches the floor, the stopper 1 has an upward / outward opening shape and is L-shaped.
Since the wall surface 1a having the character shape is provided, the opening size between the four stoppers gradually narrows as the cask 4 is lowered, and the gantry 3 is guided to a predetermined position, and the floor can be landed without the assistance of an operator. .

Even after landing, a slight gap remains between the stopper 1 and the gantry 3, so that the gantry 3 slides on the mounting table 7 due to the sway of the hull or changes in the direction of inclination, and is stopped by the stopper 1 on the opposite side. Will be. Ie clamp hardware
10 corresponds to the action of the horizontal force acting on the cask 4 in the width direction.
Since it can slide following, the width direction of the mask (arrow 6)
Direction), the gantry 3 moves along the groove 8 along the gap between the stopper 1 and the gantry 3 while maintaining the clamped state.

The above-described slide of the base 3 of the clamp hardware 10 causes the hydraulic pressure of the hydraulic cylinder 12 to be released under no pressure so that the cylinder rod is held in the clamped state.
Is possible by making the movements of the same. That is, if one clamp hardware 10 is pushed by the gantry 3 and retreats, the other clamp hardware 10 is pulled forward through the hydraulic cylinder 12 to which the rod is fixed, and follows the movement of the gantry 3 while maintaining the clamped state. I do. On the other hand, the horizontal force in the longitudinal direction of the mask causes frictional resistance due to the above-mentioned vertical component force at the time of clamping, but the horizontal force greater than the frictional resistance causes slipping on the clamp surface, the gantry moves, and is supported by the stopper. Will be done.

As described above, since the horizontal force and the overturning moment acting on the cask 4 are shared and supported by the stopper 1 and the clamp device 2, the clamp device 2 can be made compact. The clamp hardware 10 of the clamping device and the clamp seat 11 on the gantry 3 have inclined surfaces 10a and 11a having an appropriate gradient, and the clamp hardware 10 attracted by the hydraulic cylinder 12 generates a vertical component force due to the inclination angle. The gantry 3 is pressed against the mounting table 7.

This vertical component force is supported by the groove provided in the mounting table and the fitting portion of the clamp hardware fitted in the groove. Therefore, even if a tipping moment acts on the cask 4, the lifting of the gantry 3 can be suppressed. . Further, by operating the hydraulic cylinder 12 remotely, it is possible to secure and unlock the cask (stand) by remote control.

[0032]

As described above in detail, the following effects and advantages can be obtained by the cask securing device of the present invention. (1) When landing the cask, the guides and side stoppers guide the four sides of the mount to which the cask is fixed.
It is possible to easily and quickly land on a predetermined place. In addition, relatively fine positioning such as bolt hole alignment between the mounting table and the gantry in the bolt tightening method is not required, and work efficiency is improved. (2) A pair of clamps can be simultaneously driven by a hydraulic cylinder to secure or release the gantry from both sides in the width direction. It can greatly contribute to labor saving. (3) Since the hydraulic cylinder can be controlled by remote control, the cask can be secured or released without approaching the cask, ensuring the safety of work and reducing the possibility of exposure. (4) Since the horizontal force and the overturning moment caused by the rocking or tilting of the carrier or transport vehicle are shared and supported by the guide / side stopper and the clamp device,
The clamp device can be made compact. (5) When the hydraulic cylinder is provided with a mechanism for maintaining a clamp state in a state where no hydraulic pressure is applied, the reliability as a securing device is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disk securing device according to an embodiment of the present invention.

FIG. 2 shows the guide and side stopper A in FIG.
FIG.

FIG. 3 is a partial side sectional view showing a clamp state of the clamp device.

FIG. 4 is a partial side sectional view showing a state before clamping of the apparatus.

FIG. 5 is a front view of the device.

FIG. 6 is a view taken in the direction of the arrows CC in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide and side stopper 2 Clamping device 3 Mounting frame (for a key) 4 Keystone 5 Longitudinal direction of a keystone 6 Width of a keystone 7 Mounting table 8 Groove provided on a mounting table 9 End of groove provided in a mounting table 10 Clamp Hardware 10a Inclined surface 11 Clamp seat 11a Inclined surface 12 Hydraulic cylinder 13 Connecting rod 14 Pin 15 Head-side oil inlet of hydraulic cylinder 16 Rod-side oil inlet of hydraulic cylinder 17 Slide plate

────────────────────────────────────────────────── (5) References JP-A-49-67383 (JP, A) JP-A-57-156187 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B63B 25/00 B25J 15/00

Claims (2)

(57) [Claims] 1. A cask securing device for securing a mount capable of fixing a cask to a mounting base of a transport body such as a carrier ship or a transport vehicle, wherein the mounting base is provided on the mounting base and the mounting base is mounted on the mounting base. When making it have a function as positioning means,
After the gantry is mounted on the mounting table, a guide / stopper having a function as a side stopper for restricting movement of the gantry in the front-rear direction and the left-right direction is provided on the mounting table in parallel with the width direction of the mask. and slidably fitted into the groove, the clamping device the onboard said platform having at the same time clampable pair of clamping hardware from both sides in the width direction of the Kiyasuku is provided et al is in the mounting base, by the clamping device Under the clamp condition of the above stand
The clamp hardware and the clamp provided on the pedestal
Above the frictional resistance of the clamp surface formed by the seat
The above clamp is used for the longitudinal horizontal force acting on the cask.
The base slides on the surface, and the clamp hardware and the
Above the direction parallel to the above groove that is larger than the frictional resistance between the mounting table
The clamp hardware is above the horizontal force acting on the cask.
Along the above-mentioned groove along with the stand while clamping the stand
Slide on the two-way water acting on the casks
The base slid by flat force makes the guide and
The gantry is supported by a par and is caused by the overturning moment acting on the casks.
The rotation uplift of the shaft is suppressed by the clamp device.
A shackle securing device, characterized in that: 2. The cask securing device according to claim 1, wherein the clamping device has an axis centered in the width direction of the cask.
The above-mentioned board is arranged in parallel with the line and is movable in the coaxial line direction.
It has a hydraulic cylinder attached to the mounting table, which can hold the rod without hydraulic pressure.
With a mechanical lock mechanism
The clamp hardware of the above is the rod side of the hydraulic cylinder and the head
Side of the hydraulic cylinder
The pair of clamp hardware are extended and extended.
Characterized by being slidable simultaneously .
Cask lashing device.