CA1105329A - Ice-breaking apparatus for ships and barges for operation on icy waters - Google Patents
Ice-breaking apparatus for ships and barges for operation on icy watersInfo
- Publication number
- CA1105329A CA1105329A CA291,849A CA291849A CA1105329A CA 1105329 A CA1105329 A CA 1105329A CA 291849 A CA291849 A CA 291849A CA 1105329 A CA1105329 A CA 1105329A
- Authority
- CA
- Canada
- Prior art keywords
- ice
- breaking apparatus
- breaking
- nozzle
- nozzles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An ice-breaking apparatus for use in ships and barges operating in icy waters, including nozzles for jetting high pressure fluid, is disclosed. By impinging force or cavitation caused by the high pressure fluid jetted from the nozzles, grooves or cracks are formed in an ice floe, and then, the ice floe is broken at these grooves or cracks by the hull. This ice-breaking apparatus facilitates breakage of ice floes or the like, and when this ice-breaking apparatus is attached, ships or barges operating in icy waters can be built without increasing their dimensions or propulsion powers, particularly useful for navigation in icy waters.
An ice-breaking apparatus for use in ships and barges operating in icy waters, including nozzles for jetting high pressure fluid, is disclosed. By impinging force or cavitation caused by the high pressure fluid jetted from the nozzles, grooves or cracks are formed in an ice floe, and then, the ice floe is broken at these grooves or cracks by the hull. This ice-breaking apparatus facilitates breakage of ice floes or the like, and when this ice-breaking apparatus is attached, ships or barges operating in icy waters can be built without increasing their dimensions or propulsion powers, particularly useful for navigation in icy waters.
Description
11~5329 Background of the Invention (1) Field of the Invention:
The present invention relates to an ice-breaking a~paratus for facilitating navigation of ships or barges in icy waters.
The present invention relates to an ice-breaking a~paratus for facilitating navigation of ships or barges in icy waters.
(2) Brief Description of the Prior Art:
Icebreakers or iceboats have been generally used as vessels navigating in icy waters. In vessels of this type, the kinetic energ~ of the vessel is utilized for breaking ice and in order to obtain a high ice-breaking capacity, therefore, it is necessary to increase the kinetic energy by enlarging the hull or enhancing the power of the main engine, and it also is necessary to improve the structure and shape of the hull per se so that the kinetic energy can be transmitted effectively at high efficiency to the ice to be broken. Accordingly, attempts have heretofore been made to attain improvements in the foregoing points. In practice, however, in building ships or vessels of this type, various economic and other limitations are imposed on increasing the dimensions of the hull or powering-up of the engine, and therefore, no satisfactory ice-breaking capacity can be obtained in many cases.
In general, the ice-breaking operation is divided in two types, namely, continuous ice breaking applied to relatively thin ice and charging ice-breaking applied to thick ice. Continuous ice breaking is performed by the thrust of a ship and a knife edge mounted on the bow. Charging ice-breaking is performed by repeating an approach run from a certain distance and a colliding against the ice.
These conventional ice-breaking methods, however, are very inefficient. For example, in the case of continuous ice breaking, - 2 - ~ i s329 the forward speed of the vessel is ordinarily lowered by several knots, although the speed varies to some extent depending on the thickness of the ice or the capacity of the ship, and in the case of charging ice breaking, the opening distance by one charging operation is only from several to several hundred meters.
Accordingly, the ice-breaking efficiency is low, especially in the case of charging ice-breaking, and further, there is always the risk involved that during the ice-breaking operation, the ship will be blocked by ice and will not be allowed to escape.
Obiects of the Invention The present invention i8 to eliminate the foregoing defects involved in conventional continuous ice breaking and charging ice breaking by icebreakers or iceboats.
It is therefore a primary objective of the present invention to increase the efficiency of continuous ice breaking or charging ice bxeaking in icebreakers or iceboats navigating in ice waters and barges (inclusive of pushers and tugboats) for operation in ice waters without increasing the dimensions of the vessel or the powers of the main engines thereof.
Another objective of the present invention is to moderate the dangers involved in charging ice breaking and to ensure efficient and safe navigation.
Other objects and advantages of the present invention will become apparent from the following detailed description.
Brief Summary of the Invention In accordance with the present invention, the foregoing objects can be attained by an ice-breaking apparatus for ships and barges for operation in icy waters, including nozzles for jetting high pressure fluid to the ice to break the ice, wherein , i .
11~53zg a rotatable turret is mounted on the bow and nozzles are disposed on an extensible arm attached to said turret, or nozzles are dis-posed on the bow portion, either independent of or in combination with said nozzles disposed on the extensible arm.
According to the present invention, cracks or grooves are formed in the ice by the action of high pressure fluid, for example, high pressure water, jetted from the above-mentioned nozzles, whereby the kinetic energy need not be especially increased. Further, since ice is broken only at necessary parts or portions thereof, the operation efficiency can be remarkably enhanced. Moreover, since the hull intrudes into broken or cracked ice, damages to the hull by the ice-breaking operation can be effectively prevented from occurring, and in case of charging ice-breaking, the foregoing risk of stalling in ice can -~
be eliminated.
Brief DescriPtion of the Drawinq Figure 1 is a plan view, showing the state where a vessel for operation in icy waters breaks ice;
Figure 2 is a side view of the bow structure equipped with ice-breaking nozzles according to the present invention, which illustrates an embodiment in which ice is thrust down in the water and broken;
Figure 3 i5 a side view of the bow structure equipped with ice-breaking nozzles of the present invention, which illustrates an embodiment in which ice is raised up from below and broken:
Figure 4 is a side view of the bow structure equipped with ice-breaking nozzles of the present invention, which illustrates an embodiment in which the nozzles are disposed on an extensible arm on a turret; and z~
Figure 5 is a diagram illustrating in detail a head structure and a high pressure water pipe system in the apparatus of the present invention.
Detailed DescriPtion of Preferred Embodiments Figure 1 illustrates the state where ice is broken according to the customary continuous ice-breaking method. As is seen from Fig. 1, a vessel is allowed to advance through the generation and development of cracks in an ice floe and through the breakage of the ice floe. Accordingly, if a state promoting breakage of an ice floe is artifically realized in advance or conditions ~or bringing about this state with ease are produced, it will be possible to perform the ice-breaking operation more readily and easily than in the conventional methods.
As a means for generating cracks in ice floes, as pointed out hereinbefore, there has been used a knife edge mounted on the bow.
In the present invention, an ice-breaking nozzle for jetting high pressure fluid is used instead of said conventional knife edge.
One of the characteristic features of the present invention resides in the use of such a nozzle.
This ice-breaking nozzle may be disposed directly on the bow or it may be supported on an extensible arm mounted on a turret device disposed on the hull. Tn principle, the present invention includes these two features as main embodiments.
The present invention will now be described in greater detail in conjunction with the accompanying drawings.
Referring to Fig. 2 illustrating the structure of the bow portion 2 where a number of nozzles 1 are arranged, the nozzles 1 are embedded in the bottom portion of a groove 3 formed on the bow 2 so that damage to the nozzles by direct contact or collision with the ice can be prevented.
High pressure fluid, for example, sea water or fresh water stored in the ship, which has been pressurized, is jetted from these nozzles, whereby cracks become formed in the ice. Accord-ingly, the ice-breaking efficiency is enhanced and the sailing speed is increased. In case of charging ice-breaking, if CUt5 are formed by the first charging, the ice is readily broken by the second charging, and hence, the ice-breaking capacity can be remarkably enhanced.
In the embodiment shown in Fig. 2, ice is thrust down by the bow portion and thus broken. On the other hand, in the embodi-ment shown in Fig. 3, ice i8 raised up from below and thus broken.
Specifically, in the embodiment illustrated in Fig. 2, nozzles are arranged so that cracks are generated from the upper portion of ice 4 and in the embodiment shown in Fig. 3, nozzles are arranged so that cracks are generated from the lower portion of ice 4.
When nozzles are disposed in the bow portion aq shown in Figs. 2 and 3, in order to maintain an optimum distance between each nozzle l and ice 4 and to prevent damage to the nozzles at the time of collision, the nozzles are disposed at a position inner to the position of the shell plating in the bow portion, and they are surrounded by electrically heated panels. As a means for maintaining a certain distance between the nozzles 1 and ice 4, in the embodiments shown in Figs. 2 and 3, a groove 3 is formed. Alternatively, an optimum distance can be maintained by depressing only parts of the bow near the noæzles 1.
Figure 4 illustrates an embodiment in which a movable type ice-breaking apparatus is mounted on a vessel. In Fig. 4, `" 11~3Z9 reference numeral 2 represents the bow portion of an icebreaker or iceboat or barge. A rotatable turret 5 is disposed on the deck, and an extensible arm 6, the length of which can be adjusted, is mounted on this turret 5. On the top end portion of the arm 6, there is arranged a hydraulic device 7 for adjusting the vertical position of nozzles, and another hydraulic device 8 for adjusting the nozzle angle, and a head 10 is attached through a -damper 9. The top end of the arm 6 is connected to a hydraulic winch through a wire 11. By this winch, the load of the arm and other members is supported, and this winch is operated when a large displacement is required for the head 10.
In the structure shown in Fig. 4, optimum conditions for the ice-breaking nozzles can be optionally selected. More specifically the distance from the bow, the distance from the ice surface, the cutting angle and other conditions can be appropriately set by operating the extensible arm 6 as required. Further a distance measuring device including an ultrasonic wave generator and an ultrasonic w~ve receiver is disposed in the vicinity of the nozzles and the nozzles are automatically controlled so that they are located at optimum positions from the ice surface irrespective of the convex-concave state of the ice surface and the change of posture of the vessel.
When the ice-breaking apparatus of the present invention is used for continuous ice breaking, breaking of ice in a direction facilitating the advance of the ship is effectively attained or promoted, and the sailing speed can be made much higher than in the case where the ice-breaking apparatus of the present invention is not usedO In case of charging ice-breaking, if the ship is stopped at the ice-breaking point and ice is cut or cracked in ~1~53Z9 advance by using the ice-breaking apparatus of the present inven-tion, an easily broken state is brought about in the ice, and as compared with the case where the ice-breaking apparatus of the present invention is not used, the critical ice-breaking capacity can be remarkably enhanced.
Figure 5 illustrates a head structure and a high pressure water (or sea water) pipe system. Sea water or fresh water in a sea chest or water tank 12 is sucked by a booster pump 13 and passed through a heat exchanger 14 and a filter 15, and the pressure is further elevated by a piston pump 16. A thermometer 17 is disposed bet~een the heat exchanger and the filter, and the piston pump is driven by an electric motor 18. Pressurized water from the piston pump is introduced to the head through a nozzle line 19. A by-pass valve 20 is disposed midway in this line to discharge high pressure water in case of emergency. The head includes a type (a) and a type (b). The head (a) is a moving type head. A skirt 21 is attached to prevent the head from being damaged at the time of collision, and in the interior, there are disposed a nozzle 22 and an echo distance measuring device 23.
ThiS echo distance measuring device is connected to the interior of the ship through power and signal cables 24. The nozzle is heated by an electrically heated panel 25 so as to prevent freezing of the liquid in the nozzle. For the same reason, a nichrome wire 26 is aligned along the nozzle line.
The head (b) is one to be disposed in the bow structure.
High pressure water supplied through a nozzle line 19 is distri-buted by a control valve 28, passed through a heated pipe 26 and introduced to a designated nozzle 22. The nozzles 22 are arranged on the bottom face of a slit 3 formed on the shell plating 29 of -~l~;S~Z9 the bow in a state surrounded by an electrically heated panel 25, In the present invention, an ice floe is broken or breaking of an ice floe is promoted by an impinging force or cavitation caused by the jetting of high pressure fluid, and since grooves or cracks promoting breakage of the ice floe can be formed on the ice floe effectively by such impinging force or cavitation, the energy required for breakage of ice can be remarkably reduced according to the present invention.
As will be apparent from the foregoing illustration, according to the present invention, prior to breakage of an ice floe, grooves or cracks are formed on the ice floe, and therefore, breakage of the ice floe can be remarkably facilitated and the ice-breaking capacity of a ship or barge can be enhanced. More-over, dangers involved in the ice-breaking operation can be drastically diminished and safe and efficient navigation can be ensured. Accordingly, the present invention makes great and valuable contribution to the art.
Icebreakers or iceboats have been generally used as vessels navigating in icy waters. In vessels of this type, the kinetic energ~ of the vessel is utilized for breaking ice and in order to obtain a high ice-breaking capacity, therefore, it is necessary to increase the kinetic energy by enlarging the hull or enhancing the power of the main engine, and it also is necessary to improve the structure and shape of the hull per se so that the kinetic energy can be transmitted effectively at high efficiency to the ice to be broken. Accordingly, attempts have heretofore been made to attain improvements in the foregoing points. In practice, however, in building ships or vessels of this type, various economic and other limitations are imposed on increasing the dimensions of the hull or powering-up of the engine, and therefore, no satisfactory ice-breaking capacity can be obtained in many cases.
In general, the ice-breaking operation is divided in two types, namely, continuous ice breaking applied to relatively thin ice and charging ice-breaking applied to thick ice. Continuous ice breaking is performed by the thrust of a ship and a knife edge mounted on the bow. Charging ice-breaking is performed by repeating an approach run from a certain distance and a colliding against the ice.
These conventional ice-breaking methods, however, are very inefficient. For example, in the case of continuous ice breaking, - 2 - ~ i s329 the forward speed of the vessel is ordinarily lowered by several knots, although the speed varies to some extent depending on the thickness of the ice or the capacity of the ship, and in the case of charging ice breaking, the opening distance by one charging operation is only from several to several hundred meters.
Accordingly, the ice-breaking efficiency is low, especially in the case of charging ice-breaking, and further, there is always the risk involved that during the ice-breaking operation, the ship will be blocked by ice and will not be allowed to escape.
Obiects of the Invention The present invention i8 to eliminate the foregoing defects involved in conventional continuous ice breaking and charging ice breaking by icebreakers or iceboats.
It is therefore a primary objective of the present invention to increase the efficiency of continuous ice breaking or charging ice bxeaking in icebreakers or iceboats navigating in ice waters and barges (inclusive of pushers and tugboats) for operation in ice waters without increasing the dimensions of the vessel or the powers of the main engines thereof.
Another objective of the present invention is to moderate the dangers involved in charging ice breaking and to ensure efficient and safe navigation.
Other objects and advantages of the present invention will become apparent from the following detailed description.
Brief Summary of the Invention In accordance with the present invention, the foregoing objects can be attained by an ice-breaking apparatus for ships and barges for operation in icy waters, including nozzles for jetting high pressure fluid to the ice to break the ice, wherein , i .
11~53zg a rotatable turret is mounted on the bow and nozzles are disposed on an extensible arm attached to said turret, or nozzles are dis-posed on the bow portion, either independent of or in combination with said nozzles disposed on the extensible arm.
According to the present invention, cracks or grooves are formed in the ice by the action of high pressure fluid, for example, high pressure water, jetted from the above-mentioned nozzles, whereby the kinetic energy need not be especially increased. Further, since ice is broken only at necessary parts or portions thereof, the operation efficiency can be remarkably enhanced. Moreover, since the hull intrudes into broken or cracked ice, damages to the hull by the ice-breaking operation can be effectively prevented from occurring, and in case of charging ice-breaking, the foregoing risk of stalling in ice can -~
be eliminated.
Brief DescriPtion of the Drawinq Figure 1 is a plan view, showing the state where a vessel for operation in icy waters breaks ice;
Figure 2 is a side view of the bow structure equipped with ice-breaking nozzles according to the present invention, which illustrates an embodiment in which ice is thrust down in the water and broken;
Figure 3 i5 a side view of the bow structure equipped with ice-breaking nozzles of the present invention, which illustrates an embodiment in which ice is raised up from below and broken:
Figure 4 is a side view of the bow structure equipped with ice-breaking nozzles of the present invention, which illustrates an embodiment in which the nozzles are disposed on an extensible arm on a turret; and z~
Figure 5 is a diagram illustrating in detail a head structure and a high pressure water pipe system in the apparatus of the present invention.
Detailed DescriPtion of Preferred Embodiments Figure 1 illustrates the state where ice is broken according to the customary continuous ice-breaking method. As is seen from Fig. 1, a vessel is allowed to advance through the generation and development of cracks in an ice floe and through the breakage of the ice floe. Accordingly, if a state promoting breakage of an ice floe is artifically realized in advance or conditions ~or bringing about this state with ease are produced, it will be possible to perform the ice-breaking operation more readily and easily than in the conventional methods.
As a means for generating cracks in ice floes, as pointed out hereinbefore, there has been used a knife edge mounted on the bow.
In the present invention, an ice-breaking nozzle for jetting high pressure fluid is used instead of said conventional knife edge.
One of the characteristic features of the present invention resides in the use of such a nozzle.
This ice-breaking nozzle may be disposed directly on the bow or it may be supported on an extensible arm mounted on a turret device disposed on the hull. Tn principle, the present invention includes these two features as main embodiments.
The present invention will now be described in greater detail in conjunction with the accompanying drawings.
Referring to Fig. 2 illustrating the structure of the bow portion 2 where a number of nozzles 1 are arranged, the nozzles 1 are embedded in the bottom portion of a groove 3 formed on the bow 2 so that damage to the nozzles by direct contact or collision with the ice can be prevented.
High pressure fluid, for example, sea water or fresh water stored in the ship, which has been pressurized, is jetted from these nozzles, whereby cracks become formed in the ice. Accord-ingly, the ice-breaking efficiency is enhanced and the sailing speed is increased. In case of charging ice-breaking, if CUt5 are formed by the first charging, the ice is readily broken by the second charging, and hence, the ice-breaking capacity can be remarkably enhanced.
In the embodiment shown in Fig. 2, ice is thrust down by the bow portion and thus broken. On the other hand, in the embodi-ment shown in Fig. 3, ice i8 raised up from below and thus broken.
Specifically, in the embodiment illustrated in Fig. 2, nozzles are arranged so that cracks are generated from the upper portion of ice 4 and in the embodiment shown in Fig. 3, nozzles are arranged so that cracks are generated from the lower portion of ice 4.
When nozzles are disposed in the bow portion aq shown in Figs. 2 and 3, in order to maintain an optimum distance between each nozzle l and ice 4 and to prevent damage to the nozzles at the time of collision, the nozzles are disposed at a position inner to the position of the shell plating in the bow portion, and they are surrounded by electrically heated panels. As a means for maintaining a certain distance between the nozzles 1 and ice 4, in the embodiments shown in Figs. 2 and 3, a groove 3 is formed. Alternatively, an optimum distance can be maintained by depressing only parts of the bow near the noæzles 1.
Figure 4 illustrates an embodiment in which a movable type ice-breaking apparatus is mounted on a vessel. In Fig. 4, `" 11~3Z9 reference numeral 2 represents the bow portion of an icebreaker or iceboat or barge. A rotatable turret 5 is disposed on the deck, and an extensible arm 6, the length of which can be adjusted, is mounted on this turret 5. On the top end portion of the arm 6, there is arranged a hydraulic device 7 for adjusting the vertical position of nozzles, and another hydraulic device 8 for adjusting the nozzle angle, and a head 10 is attached through a -damper 9. The top end of the arm 6 is connected to a hydraulic winch through a wire 11. By this winch, the load of the arm and other members is supported, and this winch is operated when a large displacement is required for the head 10.
In the structure shown in Fig. 4, optimum conditions for the ice-breaking nozzles can be optionally selected. More specifically the distance from the bow, the distance from the ice surface, the cutting angle and other conditions can be appropriately set by operating the extensible arm 6 as required. Further a distance measuring device including an ultrasonic wave generator and an ultrasonic w~ve receiver is disposed in the vicinity of the nozzles and the nozzles are automatically controlled so that they are located at optimum positions from the ice surface irrespective of the convex-concave state of the ice surface and the change of posture of the vessel.
When the ice-breaking apparatus of the present invention is used for continuous ice breaking, breaking of ice in a direction facilitating the advance of the ship is effectively attained or promoted, and the sailing speed can be made much higher than in the case where the ice-breaking apparatus of the present invention is not usedO In case of charging ice-breaking, if the ship is stopped at the ice-breaking point and ice is cut or cracked in ~1~53Z9 advance by using the ice-breaking apparatus of the present inven-tion, an easily broken state is brought about in the ice, and as compared with the case where the ice-breaking apparatus of the present invention is not used, the critical ice-breaking capacity can be remarkably enhanced.
Figure 5 illustrates a head structure and a high pressure water (or sea water) pipe system. Sea water or fresh water in a sea chest or water tank 12 is sucked by a booster pump 13 and passed through a heat exchanger 14 and a filter 15, and the pressure is further elevated by a piston pump 16. A thermometer 17 is disposed bet~een the heat exchanger and the filter, and the piston pump is driven by an electric motor 18. Pressurized water from the piston pump is introduced to the head through a nozzle line 19. A by-pass valve 20 is disposed midway in this line to discharge high pressure water in case of emergency. The head includes a type (a) and a type (b). The head (a) is a moving type head. A skirt 21 is attached to prevent the head from being damaged at the time of collision, and in the interior, there are disposed a nozzle 22 and an echo distance measuring device 23.
ThiS echo distance measuring device is connected to the interior of the ship through power and signal cables 24. The nozzle is heated by an electrically heated panel 25 so as to prevent freezing of the liquid in the nozzle. For the same reason, a nichrome wire 26 is aligned along the nozzle line.
The head (b) is one to be disposed in the bow structure.
High pressure water supplied through a nozzle line 19 is distri-buted by a control valve 28, passed through a heated pipe 26 and introduced to a designated nozzle 22. The nozzles 22 are arranged on the bottom face of a slit 3 formed on the shell plating 29 of -~l~;S~Z9 the bow in a state surrounded by an electrically heated panel 25, In the present invention, an ice floe is broken or breaking of an ice floe is promoted by an impinging force or cavitation caused by the jetting of high pressure fluid, and since grooves or cracks promoting breakage of the ice floe can be formed on the ice floe effectively by such impinging force or cavitation, the energy required for breakage of ice can be remarkably reduced according to the present invention.
As will be apparent from the foregoing illustration, according to the present invention, prior to breakage of an ice floe, grooves or cracks are formed on the ice floe, and therefore, breakage of the ice floe can be remarkably facilitated and the ice-breaking capacity of a ship or barge can be enhanced. More-over, dangers involved in the ice-breaking operation can be drastically diminished and safe and efficient navigation can be ensured. Accordingly, the present invention makes great and valuable contribution to the art.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An ice-breaking apparatus for a ship or barge for operation on icy waters, which includes a turret mounted on a bow portion of the ship or barge, an extensible arm mounted on said turret, a head disposed on a leading end portion of said extensible arm, and including a nozzle for jetting a high pressure fluid against the ice surface, and an echo distance measuring device, said nozzle being automatically controlled by said echo distance measuring device to maintain a certain optimum position relative to the ice surface.
2. An ice-breaking apparatus as claimed in claim 1, wherein said echo distance measuring device comprises an ultrasonic wave generator and an ultrasonic wave receiver.
3. An ice-breaking apparatus as claimed in claim 1, wherein said nozzle is provided with an electrically heated panel for prevention of freezing of the fluid.
4. An ice-breaking apparatus as claimed in claim 1, wherein said head is disposed through a hydraulic device provided at a leading end portion of said arm for adjusting the vertical position of said nozzle.
5. An ice-breaking apparatus as claimed in claim 1, wherein said head is disposed through a hydraulic device provided at a leading end portion of said arm for adjusting the nozzle angle.
6. An ice-breaking apparatus as claimed in claim 1, wherein said head is disposed through a damper provided at a leading end portion of said arm.
7. An ice-breaking apparatus as claimed in claim 1, wherein in addition to said nozzle, a number of nozzles for jetting a high pressure fluid are embedded in a groove formed in the bow plating of the ship or barge.
8. An ice-breaking apparatus as set forth in claim 1, 2 or 3 wherein the structure for use in ice waters in an oil-drilling platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA291,849A CA1105329A (en) | 1977-11-28 | 1977-11-28 | Ice-breaking apparatus for ships and barges for operation on icy waters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA291,849A CA1105329A (en) | 1977-11-28 | 1977-11-28 | Ice-breaking apparatus for ships and barges for operation on icy waters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1105329A true CA1105329A (en) | 1981-07-21 |
Family
ID=4110151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA291,849A Expired CA1105329A (en) | 1977-11-28 | 1977-11-28 | Ice-breaking apparatus for ships and barges for operation on icy waters |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1105329A (en) |
-
1977
- 1977-11-28 CA CA291,849A patent/CA1105329A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4471708A (en) | Self-propelled semi-submersible service vessel | |
| IE47743B1 (en) | Service vessel | |
| US4276845A (en) | Ice cutting and breaking vessel | |
| US3669052A (en) | Method and apparatus for preventing ice damage to marine structures | |
| US4152999A (en) | Ice-breaking apparatus for ships and barges for operation on icy waters | |
| US4020777A (en) | Vessel and apparatus for at-sea retrieval of buoys and anchors | |
| JP4018134B2 (en) | Ships for transporting and producing hydrocarbons from offshore seas and / or filling / discharging and / or handling oil wells | |
| CN104002932A (en) | New ship type for fast lifting and maintaining broken-down ships on sea | |
| US4800831A (en) | Ice breaker | |
| CN109229287B (en) | Novel hovercraft ice breaking device and method | |
| US3878804A (en) | Ice-breaking apparatus | |
| US5660131A (en) | Icebreaker attachment | |
| CA1105329A (en) | Ice-breaking apparatus for ships and barges for operation on icy waters | |
| US9056658B2 (en) | Icebreaking vessel | |
| US3717115A (en) | Ice-channel cutting attachment for ships | |
| CA1068498A (en) | Method and apparatus for breaking ice with water | |
| US4534738A (en) | Tug type vessel | |
| US3530814A (en) | Icebreaking attachment | |
| US3768427A (en) | Icebreaker oil tankers | |
| US3977345A (en) | Hydraulic ice breaker | |
| CN211543806U (en) | Reef-touch-preventing and grounding-preventing ship side-stopping positioning device | |
| RU2612343C9 (en) | Semi-submersible icebreaker | |
| US3670681A (en) | Ship mounted ice breaking system | |
| US3841252A (en) | Method of breaking ice | |
| RU2651415C1 (en) | Ice breaking method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |