JPH08133175A - Cask fastening device - Google Patents

Abstract

PURPOSE: To enable a device to perform fastening/unfastening remote control, in the device of fastening to a hold of a transport ship a cask (storage vessel of spent nuclear fuel). CONSTITUTION: A hydraulic cylinder 12 is mounted on a reverse surface of a mounting base 7 of loading a frame 3 fixed with a cask, to selectively supply operating oil from a pair of oil inlets of the hydraulic cylinder 12, and a clamp metal 10 successively provided in line with a rod is reciprocated along a groove 8 in a direction of arrow mark 9 formed in the mounting base 7, to press the clamp metal 10 by its slope 10a to a slope 11a of a clamp seat 11 on the frame 3, so as to perform fastening/unfastening against the mounting base 7 of the frame 3, that is, a hold. Since fastening/unfastening the frame 3 can be performed by remotely controlling the hydraulic cylinder, a worker can be protected from exposure.

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 cask which is a storage container for spent nuclear fuel or the like, and more particularly to a device for securing a cask to a mounting base of a transporting machine such as a carrier ship or a carrier vehicle.

[0002]

2. Description of the Related Art Conventionally, cask staking on a carrier or a transportation vehicle for spent nuclear fuel has been done by installing a cask fixed on a dedicated mount on a predetermined mounting base such as a carrier and then mounting the mount by bolts and nuts. The method of tightening the mounting table manually is common. In addition to this, there is also a method in which a cask is installed in stoppers welded and fixed on all four sides on the mounting table, and a wedge is manually driven into the gap between the cask frame and the stopper to fix the frame to the mounting table. Is done in.

In the case of the above-described bolt and nut tightening method, the mount is provided with bolt holes having a diameter of usually 50 mm on both sides of the mount at seven locations on one side, for a total of 14 locations aligned in the longitudinal direction of the mount. On the other hand, similar bolt holes are also provided on the loading platform in the hold of the carrier, and the cask fixed to the platform by the quayside crane is hoisted and loaded at a predetermined position on the boat, and the bolt holes between the platform and loading platform are set. After adjusting, M45 bolts and nuts are attached and tightened.

Similar bolt holes are provided in a mounting base of a transportation vehicle for transporting a cask by land, and a pedestal is fixed by a procedure similar to that in the carrier. Although a lashing device that can be remotely operated has been proposed in place of the above lashing device by manual work, it has not been put to practical use yet.

[0005]

By the way, since the cask is a heavy object having a weight of about 100 tons or more, including the dedicated mount, the positioning of the mounting base and the bolt holes of the mount at the time of cask loading and securing. Is a work in which a large number of workers are pulling from each other by attaching auxiliary ropes to the four sides of the cask while supporting the weight of the cask with a quay crane. There is a problem that this work is inefficient and requires a lot of labor. In addition, the size of the bolts is large, and considerable effort is required for mounting and tightening 14 sets of bolts. In addition, since a large number of casks are mounted side by side on a ship, the work space is limited and it is necessary to pay attention to safety.

Further, since the cask stores radioactive materials, and the above-mentioned work is a manual work to approach the cask, it is necessary to take turns a large number of workers in order to manage the exposure of the workers. There is also a problem. The present invention is intended to solve such a problem, and a cask staking device which enables a pedestal to which a cask is fixed to be remotely sewn from a place apart 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 staking device according to a first aspect of the present invention has a cradle to which a cask can be fixed, fixed to a mount for a transporting machine such as a carrier ship or a carrier vehicle. In the cask lashing device for binding, it has a function as a positioning means when it is provided on the mounting table and the platform is landed on the mounting table, and is the same after the platform is mounted on the mounting table. A guide / stopper that functions as a side stopper that restricts the movement of the gantry in the front-rear direction and in the left-right direction, and is slidably fitted in a groove provided in the mounting base in parallel with the width direction of the cask to be slidably mounted on the mounting base. A clamp device having a clamp metal object for clamping the mounted mount is provided.

A cask lashing device according to a second aspect is the cask lashing device according to the first aspect, in which the clamp device clamps the clamp hardware to the mount base so as to clamp the mount base on the mount base. The clamp metal pressing device for pressing against the provided clamp seat is provided, and the clamp device, under the clamped state of the mount by the clamp device, is for the clamp metal object in a direction orthogonal to the sliding direction of the clamp metal object. While it is configured to allow sliding of the mount on the clamp surface when a horizontal force larger than the frictional resistance of the clamp surface is applied,
When the horizontal force in the sliding direction, which is greater than the frictional resistance between the clamp metal piece and the mounting table, is applied, the clamp metal piece is allowed to slide along the groove while being integrated with the frame. It is characterized by being configured.

Further, the cask lashing device according to a third aspect is the cask lashing device according to the second aspect, in which the slide of the gantry by the horizontal forces of the both acting on the cask is supported by the guide / stopper. In addition, the clamping device prevents the lifting of the gantry due to the overturning moment acting on the cask.

Further, the cask lashing device according to claim 4 is the cask lashing device according to claim 1, wherein
The clamp device includes a clamp metal pushing device that pushes the clamp hardware against a clamp seat provided on the mount so as to clamp the mount on the mounting base, and the clamp metal pushing device is composed of a hydraulic cylinder. By locking the movement of the hydraulic cylinder after it is clamped by the hydraulic cylinder, the clamping device is strong enough to clamp the mount on the mounting base against the horizontal force acting on the cask by the clamp device alone. It is characterized by having a device.

The cask lashing device according to a fifth aspect is the cask lashing device according to the first aspect, wherein the clamp device is provided on the cradle so that the clamp device clamps the cradle to the mounting table. A clamp metal pushing device for pushing against the clamp seat, and the clamp metal pushing device is composed of a push screw screwed to the mounting base so as to be able to move forward and backward, and the tip end of the push screw and the clamp hardware. A disc spring is interposed between the disc spring and the disc spring, and the deformation of the disc spring absorbs a horizontal force acting in the groove direction of the clamp metal piece to prevent damage to the clamp device. There is.

[0012]

In the cask lashing device of the present invention described above, the guide and side stopper act as a guide when the cask (frame) is loaded on the transportation machine, and the transportation machine shakes even after landing (after clamping). And the slide of the gantry caused by the change of the inclination direction (this slide occurs because a slight gap remains between the gantry and the guide / side stopper after landing).

The clamp hardware slides in accordance with the horizontal force in the width direction acting on the cask, and when the frictional force of the clamp surface is exceeded with respect to the horizontal force in the longitudinal direction, slip occurs on the clamp surface. Excessive force does not act on the clamp hardware. Further, in the case of the push screw type, the disc spring is deformed to prevent an excessive force from acting on the push screw.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cask lashing device as an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view thereof, and FIG. 2 is a sectional view of the guide / stopper in the direction of arrows A and B in FIG. 3 is a side view of the hydraulic cylinder type clamp device, FIG. 4 is a front view thereof, and FIG. 5 is a plan view thereof.
FIG. 6 is a side view of the push screw type clamp device, FIG. 7 is a front view thereof, and FIG. 8 is a plan view thereof.

This embodiment exemplifies a cask lashing device for lashing a pedestal 3 to which a cask 4 is fixed to a mounting base 7 provided in a hold of a cask carrier, and the lashing device is shown in FIG. As shown in 1, guide and side stopper 1
And a clamp device 2, and such lashing devices are arranged on four sides of the gantry 3. Although the clamp device 2 has two sets on one side in the example of FIG. 1, it is 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 arranged separately in the longitudinal direction (direction of arrow 5) and the width direction (direction of arrow 6) of the cask 4. You can also In this embodiment, the stoppers 1 are arranged so as to face the four corners of the pedestal 3, and each of the stoppers 1 functions as a guide and a stopper in both directions of the arrows 6 and 5 of the pedestal 3 so as to have a vertical L-shape in plan view. It has a wall 1a.

The guide and side stopper 1 is mounted on the mounting table 7
The fixing device 2 is fixed to the mounting base 7 by welding or the like, and is slidably fitted in a groove 8 formed in the mounting base 7 and parallel to the width direction 6.

The cask 4 is lifted by a quayside crane (not shown) and carried into the hold while the cask 4 is fixed to the pedestal 3, and is guided above the stopper 1 by an appropriate guide device (not shown). Come on. As shown in FIG. 2, the stopper 1 has an L-shaped vertical wall 1a whose upper side is open to the outside, and as the cask 4 is hung on the mounting base 7, the bottom of the pedestal 3 is on all four sides. Landing 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.

3 to 6 show an example of the construction of a hydraulic cylinder type clamp device, which is a clamp metal fitting 10.
And a hydraulic cylinder 12 (as a clamp metal pushing device) for sliding the clamp metal 10 in the groove 8 and pressing it against a clamp seat 11 integrally provided on the gantry 3. Corresponding to the clamp hardware 10, the mount 3 is integrally provided with the clamp seat 11, and the hydraulic cylinder 12
Is attached to the lower surface of the mounting base 7 by a bracket 13.

The clamp hardware 10 and the rod of the hydraulic cylinder are connected by a pin 14, and the hydraulic cylinder 12 and the bracket 13 are also connected by a pin 15. Bracket 13 is mounting base 7
It is fixed to the back surface of the bolt with an appropriate number of bolts 16 and nuts 16a. In the illustrated example, they are fixed by bolts, but they can also be directly welded and fixed.

In the above-mentioned structure, when working pressure oil is fed into the head side oil inlet 17 of the hydraulic cylinder 12 from a working oil pressure source (not shown), the rod extends and the clamp metal fitting 10 moves outward (arrow 9 direction, arrow 6 direction). Slide in the same direction). This state is the state before mounting the gantry 3 on the mounting base 7. Here, the cask 4 fixed to the pedestal 3 by the above-mentioned procedure is landed on the mounting base 7, and then the working oil is sent to the rod side oil inlet 18 of the hydraulic cylinder 12 to shrink the rod and clamp the metal fitting.
10 is pulled to the gantry 3 side and the clamp seat is clamped with the clamp hardware 10.
Hold down 11 and clamp (state of Figure 3).

At this time, the inclined surface 10a of the clamp hardware 10 presses the inclined surface 11a of the clamp seat 11 from above, so that the pedestal 3 is pressed against the mounting table 7 by its vertical component force. This pressing force is supported by the fitting portion of the clamp metal fitting 10 fitted in the groove 8 provided in the mounting table 7.

As shown in FIG. 4, the clamp hardware 10 is slidably fitted in the groove 8 of the mounting table 7 and slides in the direction of arrow 6 while being guided by the groove 8. Since the vertical force at the time of clamping is supported by the sliding surface 10b with the mounting base 7 as described above, the mounting base 3 does not float up even when an overturning moment acts on the mounting base 3.

In the embodiment shown in FIGS. 3 to 5, hydraulic oil is fed to the rod side of the hydraulic cylinder 12 and clamped, and the hydraulic cylinder 12 is arranged on the back surface of the mounting base 7. However, it is also possible to have a configuration in which the hydraulic oil is sent to the head side of the hydraulic cylinder 12 to be clamped, and the hydraulic cylinder 12 may be arranged on either the upper surface or the rear surface of the mounting base 7.

When the clamp device is in the clamped state,
When the horizontal force for moving the cask 4 acts in the longitudinal direction of the cask (the direction of arrow 5), if the horizontal force is larger than the frictional resistance of the clamp surface between the clamp metal fitting 10 and the clamp seat 11, The pedestal 3 is mounted until the edge of the pedestal 3 hits the stopper 1 due to slippage on the clamp surface.
It is designed to slide up.

When the horizontal force acts in the cask width direction (the direction of arrow 6), the horizontal force is transmitted to the hydraulic cylinder 12 via the clamp metal fitting 10 to increase the hydraulic pressure of an operating hydraulic line (not shown). A relief valve (not shown) is provided in the hydraulic line, and when the hydraulic pressure in the hydraulic line reaches the relief set pressure, the pressure oil is relieved by this relief valve, so that the rod of the hydraulic cylinder 12 can freely expand. it can. Therefore, the clamp metal fitting 10 is kept in the clamped state until the pedestal 3 is supported by the stopper 1.
Press to move back.

On the other hand, in the clamp device arranged on the opposite side, a hydraulic circuit (not shown) for the clamp device controls the hydraulic cylinder by controlling the clamp pressure to be constant, so that the clamp is moved in accordance with the movement of the gantry 3. The rod of the hydraulic cylinder 12 of the apparatus contracts, whereby the rod moves forward together with the gantry 3 while maintaining the clamped state. It should be noted that these movements of the gantry 3 occur because a slight gap remains between the gantry 3 and the stopper 1 even after landing.

Next, FIGS. 6 to 8 show an example of the structure of a push screw type clamp device. This clamp device is suitable for cask lashing on a vehicle for transporting the cask 4 on land, for example, when it is difficult to equip the hydraulic device due to the limitation of the load weight. The arrangement of the stopper 1 and the clamp device 2 on the transportation vehicle is the same as in the case of FIG. 1 described above, but the number of clamp devices 2 is increased in accordance with the magnitude of the force acting on the cask 4. This is because it is necessary for land transportation to be designed in such a way that a very large force acts, even in the event of a vehicle collision.

6 to 8, reference numeral 19 indicates a clamp metal fitting which is slidably fitted in a groove 8 formed on the mounting base 7 and parallel to the direction of the arrow 6, and this clamp metal fitting is shown.
19 is a set screw 21 and a clamp seat 11 via a disc spring 23.
It is configured to be pressed against and clamp the pedestal 3. That is, the push screw 21 is a pedestal provided on the mounting base 7.
Hexagonal holes 21a which are screwed into the screw holes of 22 and which can be engaged with a tool such as a handle, ratchet wrench, or impact wrench are formed at the base ends. On the other hand, a disc spring 23 is mounted in the concave portion of the clamp hardware 19, and an enlarged portion 21c that abuts against the disc spring 23 is formed on the head of the push screw 21.

Reference numeral 24 indicates a keeper plate,
The keeper plate 24 is divided into upper and lower parts or left and right parts, and the enlarging portion 21c of the head of the countersunk screw 23 and the push screw 21 is the clamp hardware 19
It is a plate to prevent it from coming off after it is attached to
It is fixed to the clamp hardware 19 with a bolt or the like not shown.

In the clamp device having the structure shown in FIGS.
After landing the cask 4 on the mounting base 7 (vehicle adapter 20), in order to support the horizontal force acting on the cask, a wedge (not shown) is previously set in the gap between the four sides of the stopper 1 and the cask base 3 in order to support the horizontal force. It is desirable that the mounting and the pedestal 3 be kept stationary. The disc spring 23 absorbs the movement when the pedestal 3 moves in the width direction 6 of the cask by absorbing the movement when the pedestal 3 moves in the width direction 6 of the cask because the above-mentioned wedge is slightly contracted in the clamped state and a small gap is generated between the pedestal 3 and the stopper 1. This is to prevent excessive force from acting.

As described above, in the cask lashing device of this embodiment, the guide / side stoppers 1 fixed by welding or the like are fixed to the cask 4 on the four sides of the cask installation position of the mounting base 7.
Acts as a guide when loading the ship into the ship and also as a side stopper after landing. Further, when the cask 4 is landed, the stopper 1 is provided with an L-shaped vertical wall 1a having an open / outward opening shape. Therefore, as the cask 4 is lowered, the frontage between the four-way stoppers is gradually narrowed and the cask 4 Can be guided to a predetermined position and landed. Further, even after landing, a slight gap remains between the stopper 1 and the pedestal 3, so even if the pedestal 3 slides on the loading platform 7 due to the motion of the hull or the change in the inclination direction, It will be stopped with stopper 1.

Since the clamp metal fittings 10 and 19 of the clamp device and the clamp seat 11 of the gantry 3 have inclined surfaces having an appropriate slope, they are attracted or pressed by the hydraulic cylinder 12 and the push screw 21. Clamp hardware 10, 19
This vertical angle causes a component force in the vertical direction to press the gantry 3 against the mounting base 7. This vertical component force is supported by the groove 8 provided on the mounting table 7 and the fitting portions of the clamp metal fittings 10 and 19 fitted therein.

In the case of the hydraulic cylinder type clamp device, since the clamp metal piece 10 slides following the horizontal force acting on the cask 4 in the width direction (direction of arrow 6), the clamped state is maintained in the width direction of the cask 4. The cradle can move with the gap between the stopper 1 and the cradle 3 depending on the change in the direction of action of the horizontal force, and it is possible to prevent an excessive force from being applied to the clamp device, which makes it possible to make the clamp device compact. Become.

In this case, the clamp hardware follows the hydraulic pressure of the clamp side of the hydraulic cylinder up to the set pressure of the relief valve provided in the circuit, and the relief causes the rod of the cylinder to move to slide the clamp hardware. At this time, the clamp device on the side opposite to this lowers the hydraulic pressure required for clamping due to the movement of the gantry. Therefore, the rod of the cylinder moves so as to maintain the set hydraulic pressure, and the clamp metal object can be slid to maintain the clamped state.

With respect to the horizontal force acting on the cask in the longitudinal direction (direction of arrow 5), frictional resistance is generated by the vertical component force at the time of clamping described above. The gantry 3 moves and the stopper 1
Will be supported by.

In the case of the push-screw type clamp device, the clamp hardware 19 cannot follow the slide of the gantry due to the horizontal force in the cask width direction (direction of arrow 6) described above, so that the cask 4 is landed at a predetermined position. After that, a wedge is attached to the gap between the stopper 1 and the pedestal 3 so that the horizontal force of the cask width direction does not act on the clamp device.
When the pedestal 3 slips due to slight loosening of the wedge and a horizontal force is applied to the clamp device, the disc spring 23 between the push screw 21 and the clamp hardware 19 absorbs the movement of the pedestal 3 and an excessive force is applied. It does not act on the push screw 21.

The operation of the clamp device and the landing control of the pedestal 3 to which the cask is fixed can be performed by remote control, whereby the cask can be secured by remote control. It goes without saying that the lashing can be released by remote control as well. Further, in the above embodiment,
When a horizontal force greater than a predetermined amount in the width direction and the lateral direction is applied, slippage occurs in the clamp portion and an excessive force does not act on the clamp device.However, by increasing the strength of the clamp device, When a horizontal force is applied, it is possible to prevent the clamp device from being damaged without causing slippage in the clamp portion.

[0039]

As described in detail above, according to the cask lashing device of the present invention, the following effects and advantages can be obtained. (1) When a pedestal to which a cask is fixed is landed, the guides and side stoppers guide the four sides of the gantry, so that the pedestal can be landed on a predetermined place easily and in a short time. Further, it is not necessary to perform a relatively fine alignment such as a bolt hole alignment between the mounting base and the mount in the conventional bolt tightening method, and work efficiency is improved. (2) The clamp device can be made compact by having the guide / side stopper and the clamp device share and support the horizontal force and the overturning moment caused by the shaking / tilting of the carrier or transport vehicle. (3) When the clamp device is a hydraulic cylinder type, the cask can be fastened or unfastened instantly and simultaneously by several sets, which can greatly contribute to labor saving.

Further, since the hydraulic cylinder can be controlled by remote operation, the cask is secured or unconstrained without approaching the cask, work safety can be ensured, and the possibility of exposure to radiation is reduced. (4) When the clamp device is of the push screw type, it does not save labor as much as the hydraulic cylinder type, but it can be fastened or unfastened in a shorter time than the conventional bolt tightening method, and it requires some labor saving. Can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view of a cask lashing device as an embodiment of the present invention.

FIG. 2 is a sectional view of the guide / stopper as viewed in the directions of arrows A and B in FIG.

FIG. 3 is a side view of the hydraulic cylinder type clamp device.

FIG. 4 is a front view of the same.

FIG. 5 is a plan view of the same.

FIG. 6 is a side view of the push screw type clamp device.

FIG. 7 is a front view of the same.

FIG. 8 is a plan view of the same.

[Explanation of symbols]

 1 Guide / Stopper 2 Clamping device 3 Frame (for cask) 4 Cask 5 Arrow indicating the longitudinal direction of cask 6 Arrow indicating the width direction of cask 7 Mounting base 8 Groove formed on the mounting base 9 Arrow indicating the direction of groove 10 Clamp hardware 10a (Clamp hardware) Sliding surface 10b (Inclined surface of clamp hardware) 11 Clamp seat 11a (Inclined surface of clamp seat) Inclination surface 12 Hydraulic cylinder 13 (Hydraulic cylinder) bracket 14 Pin 15 Pin 16 Bolt 17 Hydraulic cylinder valve head side oil inlet 18 Hydraulic cylinder valve rod side oil inlet 19 Clamp hardware 20 Vehicle adapter 21 Push screw 21a Hexagon socket 22 Screw hole pedestal 23 Disc spring 24 Keeper plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiko Suga 7-14 Wadamiyadori, Hyogo-ku, Kobe Within Nishiryo Engineering Co., Ltd. (72) Toshiyuki Asakura 1000 Shinshinjo, Toyama City Japan Marine Techno Co. Within

Claims (5)

[Claims] 1. A cask lashing device for lashing a pedestal to which a cask can be fixed to a loading platform of a transportation vehicle such as a carrier ship or a transport vehicle, wherein the pedestal is provided on the loading platform and landed on the loading platform. A guide / stopper that has a function as a positioning means at the time of making it, and also has a function as a side stopper that restricts the movement of the gantry in the front-rear direction and the left-right direction after the gantry is mounted on the mounting base, And a clamp device having a clamp metal fitting for slidably fitting in a groove provided on the mounting base parallel to the width direction of the cask and clamping the mount mounted on the mounting base. A characteristic cask lashing device. 2. The cask lashing device according to claim 1, wherein the clamp device pushes the clamp metal object against a clamp seat provided on the frame to clamp the frame on the mounting table. The clamp device is provided with a horizontal force larger than the frictional resistance of the clamp surface of the clamp metal object in the direction orthogonal to the sliding direction of the clamp metal object under the clamped condition of the gantry by the clamp device. Sometimes the slide of the gantry on the clamp surface is configured to be allowed, while the horizontal force in the sliding direction, which is greater than the frictional resistance between the clamp metal object and the mounting table, acts on the groove of the clamp metal object. Characterized in that it is configured to be allowed to slide along the groove while being integrated with the pedestal Cask lashing equipment. 3. The cask lashing device according to claim 2, wherein the slide of the gantry by the horizontal forces of the both acting on the cask is supported by the guide / stopper, and the overturning moment acts on the cask. The cask lashing device is characterized in that the lifting of the gantry due to the above is prevented by the clamp device. 4. The cask lashing device according to claim 1, wherein the clamp device pushes the clamp hardware against a clamp seat provided on the mount to clamp the mount on the mounting base. The clamp metal pushing device is composed of a hydraulic cylinder, and the horizontal force acting on the cask by the clamp device alone by locking the movement of the hydraulic cylinder after the hydraulic cylinder is clamped. A cask lashing device, characterized in that the clamping device has a strength capable of clamping the gantry against the mounting table against the above. 5. The cask lashing device according to claim 1, wherein the clamp device pushes the clamp hardware against a clamp seat provided on the mount to clamp the mount on the mounting base. In addition, the clamp metal pushing device is composed of a push screw screwed to the mounting base so as to be able to move forward and backward, and a disc spring is interposed between the tip end of the push screw and the clamp metal. A cask binding device, characterized in that the deformation of the disc spring absorbs a horizontal force acting in the groove direction of the clamp metal to prevent damage to the clamp device.