JPS6321517Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is suitable for heavy cargo carriers,
For example, it relates to a ship that transports heavy objects such as casks containing spent fuel at nuclear power plants.

In the case of cask carriers transporting casks containing spent fuel or empty casks, it is necessary to provide a shielding wall around the cask storage space (hold). Concrete is commonly used as a material for this type of shielding wall, but in the case of concrete shielding walls, the weight of the ship increases comparatively. Additionally, the amount of heat dissipated from the casks containing spent fuel is large (e.g. approximately 80kw/h per unit).
Therefore, cask carriers are equipped with a cooling system to maintain the temperature within the cask storage space below a certain level, and in the event of an emergency such as a failure of the cooling system, regulations stipulate that casks must be submerged in water to cool them down. There is. When submerging a cask, it is possible to take in seawater from outside and put it into the cask storage space, but putting so much seawater into the cask storage space that the cask is submerged will increase the weight of the ship itself. There is a risk of deepening the stanchion, worsening stability, and causing damage such as rust to the cask and the equipment in the cask storage space.

This idea was made in view of the above-mentioned circumstances, and the weight increase due to the shielding wall of the heavy goods storage space is relatively small, and in an emergency, water can be quickly poured into the heavy goods storage space. To provide a heavy cargo transport ship that does not cause weight increase due to this and reduces damage to heavy cargo and equipment in a heavy cargo storage space due to water.

A heavy cargo carrier based on this invention is equipped with a shielding fresh water tank around the heavy cargo storage space whose bottom is lower than the floor of the heavy cargo storage space, and a drain outlet equipped with a valve is located on the side of the heavy cargo storage space of the fresh water tank. A drain pipe equipped with a valve and a drain pump is provided between the bottom of the fresh water tank below the floor of the heavy goods storage space and the heavy goods storage space.

According to this invention, a shielding fresh water tank with a bottom lower than the floor of the heavy goods storage space is provided around the heavy goods storage space, and the shielding wall is made of fresh water, which has a lower specific gravity than concrete. , the increase in ship weight is smaller than when a normal concrete shielding wall is provided around the heavy cargo storage space. In addition, a drain port equipped with a valve is installed at the bottom of the wall on the heavy object storage space side of the fresh water tank, so in an emergency, by opening this valve, fresh water can be quickly poured into the heavy object storage space. A drain pipe equipped with a valve and a drain pump is installed between the bottom of the fresh water tank below the floor of the heavy goods storage space and the heavy goods storage space, so the pump drains the floor of the heavy goods storage space. By moving the water in the fresh water tank further down into the heavy object storage space, heavy objects such as casks can be reliably submerged in water. In this way, in an emergency, the fresh water in the fresh water tank is simply transferred to the heavy cargo storage space, so there is no risk of the water entering the heavy cargo storage space increasing the weight of the ship, unlike when seawater is introduced from the outside. There is no change in hiccups, and the stability is increased. Furthermore, since fresh water is put into the heavy goods storage space, damage such as rust to the heavy goods and equipment in the heavy goods storage space is reduced compared to the case where seawater is put in.

Embodiments of this invention will be described below with reference to the drawings.

The drawing shows a portion of the cask carrier,
This ship has 1 cask (heavy cargo) storage space.
is provided. The storage space 1 has a vertically long rectangular shape when viewed from above, and a shielding fresh water tank 2 is provided around the storage space 1. The front and rear tanks 2 and the tanks 2 on both sides communicate with each other, and the bottoms of these tanks 2 reach the double-bottom hull outer plate 3 and are lower than the floor (double-bottom inner bottom plate) 13 of the storage space 1. ing. The rear parts of the fresh water tanks 2 on both sides and the height of the rear fresh water tank 2 are lower than other parts, and the upper part of the storage space 1 is formed by the front horizontal top wall extending between the tops of the fresh water tanks 2. 4, covered by a middle vertical wall 5 and a rear horizontal top wall 6; The front horizontal top wall 4 is provided with three rows of vertically elongated hatches 7 extending substantially over its entire length in parallel. Each hatch 7 is provided with a hatch cover 8 that opens on both front and rear sides.
A hatch cover storage section 9 is provided. At the rear of the rear horizontal top wall 6, a hatch 10 for loading and unloading the truck is provided that spans almost the entire width thereof, and this hatch 10 is provided with a side rolling type hatch cover (not shown). Concrete shielding walls 12 having a predetermined thickness are provided on the outer surfaces of the front and rear horizontal top walls 4 and 6, the outer surface of the intermediate vertical wall 5, and the outer surface of the hatch coaming of each hatch 7 and 10.

A rectangular shallow recess 14 is provided in the floor 13 of the cask storage space 1 directly below the hatch 10 for loading and unloading the trolley, and the remaining floor 13 has two recesses 14 extending in the front-rear direction over almost its entire length. Three sets of truck rails 15 are provided. Rail 1 of each set
5 are arranged directly below three rows of hatches 7, and two rows of bogie drive chains 16 are arranged on both sides of each set of rails 18. Rail 1 of each set
Lower trunks 17, each of which serves as a ventilation duct and supports a cask, are provided on the floor 13 on both sides of the trunk 5 and the chain 16, respectively, and have a rectangular cross section and extend in the front-rear direction. Recesses 20 into which both sides of the cask holding stand 19 fit are provided at the upper ends of the opposing side surfaces 18 of the pair of trunks 17 in each set, facing each other at a predetermined interval in the front-rear direction. 17 opposite side 1
8 and a large number of air outlets on the top surface 21 (not shown)
is provided. On the inner surface of the front horizontal top wall 4 on both sides of the three rows of hatches 7 of the storage space 1, an upper trunk 22 for a ventilation duct extending in the vertical direction is provided directly above the lower trunk 17. The opposing side surfaces 23 of each pair of upper trunks 22 are substantially flush with the inner surface of the side coaming of the hatch 7, and the opposing sides 23 and lower surface 24 of each trunk 22 are provided with a number of air inlets (not shown). It is provided. Each lower trunk 17 and each upper trunk 22 are
It is divided into two parts, front and rear, by movable partition walls 25 and 26 at the center in the front and rear directions, respectively. A vertical guide 27 made of angle iron is provided between the lower trunk 17 and the upper end of the side coaming of the hatch 7. These guides 27 are arranged at two outer corners of each recess 20 of the lower trunk 17, and the lower ends of the front and rear opposing surfaces of the pair of guides 27 of each recess 20 are cut out. ing.

At the lower part of the wall of the fresh water tank 2 on the side of the cask storage space 1, a plurality of drain ports 29 equipped with valves 28 are provided at appropriate locations. In addition, inside the double bottom, there is a horizontal first drain pipe 30 that connects the rear end bottoms of the fresh water tanks 2 on both sides below the floor 13 of the storage space 1, and a middle part of this drain pipe 30. A second drain pipe 31 is provided that connects the floor 13 of the storage space 1, and a valve 3 is connected to the second drain pipe 31.
2 and a drainage pump 33 are provided.

A bogie moving machine room 34 is provided at the front lower part of the front fresh water tank 2, and a cooling machine room 35 and a control room (not shown) are provided above this. A cooling machine room 35 is also provided on the concrete shielding wall 12 in front of the rear horizontal top wall 6 of the cask storage space 1. The truck moving machine room 34 is provided with three sets of truck moving devices 36 that respectively drive three sets of truck drive chains 16. Although not shown, both front and rear ends of each upper trunk 22 are connected to the front and rear cooling machine compartments 35, respectively, and ventilation ducts are provided between the front and rear ends of each lower trunk 17 and the front and rear cooling machine compartments 35. are provided for each. Although not shown, each cooling machine room 35 is provided with a cooling device including a refrigerator and a blower. This cooling device mainly cools air taken in from the upper trunk 22 and supplies it to the lower trunk 17 through a ventilation duct. Each cooling machine room 35 is provided with a ventilation tube for taking in outside air as necessary. (not shown) is provided.

The cask C is horizontally fixed on a rectangular cask holding stand 19, and is loaded and unloaded together with the holding stand 19. In cases where the quay is equipped with equipment for a cask moving cart, loading and unloading of the cask C from the carrier vessel is carried out with the stern of the vessel berthed. It is carried out using cranes installed on the quay. Although not shown, the truck 37 is provided with a jack for lifting the cask holding base 19. The trolley lifting platform 38 is suspended into the recess 14 of the cask storage space 1 through the ship's hatch 10 by a crane installed on the quay or a dedicated lifting device. Three sets of truck rails 39 are provided which connect with each set of rails 15 in the storage space 1 when fitted and positioned. In addition, in cases where the quay is not equipped with equipment for a cask moving trolley, the loading and unloading of casks to and from the ship can be carried out using a crane installed on the quay without using a trolley, with the ship side berthed. It is done using

When the cask moving cart 37 is used, the casks C are loaded onto the carrier ship as follows.

That is, first, on land, as described above, the cask C is fixed to the holding base 19 in a horizontal position,
This holding stand 19 is placed on the cart 37. or,
The cask C is fixed to a holding stand 19 placed on a trolley 37 in a sideways state. Then, this trolley 37 is fixed onto the rail 39 of the lifting platform 38 by appropriate means. Next, use a crane installed on the quay or a dedicated lifting device to lift this platform 3.
8 is suspended from the hatch 10 into the recess 14 of the storage space 1, and the trolley 37 is moved to the rail 3 of the lifting platform 38 using an appropriate means such as a remote-controlled hydraulic cylinder.
9 to the rail 15 of the storage space 1, and connect it to the chain 16 of the trolley moving device 36 to move the rail 1.
5 Move the top forward. At this time, the jack of the truck 37 is jacked up, lifting the holding base 19 slightly above the upper surface 21 of the lower trunk.
The truck 37, the holding stand 19, and the cask C move without interfering with the lower trunk 17, the guide 27, and the like. The holding stands 19 are attached to the lower trunk 17 on both sides.
When the holding table 19 has been moved directly above the predetermined recess 20, the carriage 37 is stopped and the jacks are lowered to lower the holding table 19, and its both sides are fitted into the recesses 20 on both sides and fixed. Next, only the empty cart 37 is moved rearward by the cart moving device 36, and after separating the cart 37 from the chain 16, the lifting platform 38 is moved from the rail 15 of the storage space 1.
The platform 38 is then moved and fixed onto the rail 39 of the hatch 10, and the platform 38 is lifted out of the hatch 10. Then, the empty cart 37 on the lifting platform 38 is returned to land, and the next cask C is loaded in the same manner as described above.

When unloading the cask C in the transport ship using the cask moving trolley 37, the operation opposite to the above is performed.

When the cask moving cart 37 is not used, the casks C are loaded onto the carrier ship in the following manner.

That is, the holding stand 19 on which the cask C is fixed in a sideways state is lifted by a crane installed on the quay, and the hatch 7 is placed directly above the predetermined recess 20 of the lower trunk 17 on both sides of each set of rails 15. It is gradually suspended in the storage space 1 through. As a result, the holding table 19 is attached to the four guides 27 on both sides.
, and eventually both sides thereof are fitted into the recesses 20 and fixed. During stowage work, the ship is likely to sway, but the four corners of the holding platform 19 are guided by the guides 27, and the holding platform 19 can move and rotate in the lateral and longitudinal directions. Therefore, the cask C can be easily placed beside the holding table 19 without requiring any manpower by simply suspending the holding stand 19 using a crane or the like.

When unloading the cask C from the transport ship without using the cask moving cart 37, the above-mentioned operations are carried out in reverse.

Once the cask C is placed horizontally in the predetermined position of the cask storage space 1, the front and rear hatch covers 8
Close the front and rear cooling devices. The cold air supplied from each cooling device to the lower trunk 17 through the ventilation duct is blown onto the cask C from the air outlet to cool it. In addition, in Cask C,
Preferably, fins are provided to enhance the cooling effect. The warm air after cooling the cask C is drawn into the cooling device from the intake port of the upper trunk 22 through the inside of the trunk 22, and after being cooled by the cooling device, it is circulated in the same manner as described above. Usually, the movable bulkheads 25 and 26 of each trunk 17 and 22 are
is closed, the front cooling device mainly cools the front half of the storage space 1, and the rear cooling device mainly cools the rear half of the storage space 1. Each cooling system is equipped with spare parts such as a refrigerator, blower, and generator, but in the unlikely event that one of the cooling systems stops working properly, the trunk
The movable partition walls 25 and 26 of 7 and 22 are opened, and the entire cooling device is cooled by only one of the cooling devices. and,
If the cooling capacity of only one cooling device is not sufficient, or if both the front and rear cooling devices are broken, first open the valve 28 of the drain port 29, and the fresh water in the fresh water tank 2 will be drained by gravity into the storage space. If the cask C is not submerged even if the water level in the fresh water tank 2 and the water level in the storage space 1 are almost equal, open the valve 32 of the drain pipe 31 and operate the pump 33 to drain the fresh water tank 2.
The fresh water remaining inside is moved into the storage space 1 from the bottom below the floor 13 of the storage space 1, and the cask C is completely submerged and cooled. At this time,
Since the cooling machine room 35 is provided in the upper part of the cask storage space 1, there is no risk of water flooding into the cooling machine room 35 even if enough water is put into the storage space 1 for cooling.

The configuration and arrangement of the fresh water tank 2, the configuration of the drain port 29, etc. are not limited to those of the above embodiment, and can be modified as appropriate. Further, in the above embodiment, the drain pipe 30 is connected to the rear end of the fresh water tank 2 in consideration of the trim of the ship, but the position and configuration of the drain pipe can be changed as appropriate.

[Brief explanation of drawings]

The drawings show an embodiment of this invention, in which Fig. 1 is a partially omitted longitudinal sectional view, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a sectional view taken along the line of Fig. 1, and Fig. 4 is a cross-sectional view of Fig. 1. Figure-
FIG. 1...Cask (heavy goods) storage space, 2...
...Fresh water tank, 13...Floor, 28...Valve, 29...
...Drain port, 30, 31...Drain pipe, 32...Valve,
33... Drain pump.

Claims (1)

[Scope of utility model registration request] A shielding fresh water tank 2 whose bottom is lower than the floor 13 of the heavy goods storage space 1 is provided around the heavy goods storage space 1, and a drain port 29 equipped with a valve 28.
is provided at the lower part of the wall of the fresh water tank 2 on the heavy goods storage space 1 side, and drain pipes 30 and 31 equipped with a valve 32 and a drain pump 33 are connected to the heavy goods storage space 1.
A heavy goods carrier provided between the bottom of a fresh water tank 2 below a floor 13 and a heavy goods storage space 1.