US3265028A - Method for rebuilding a hull, by the use of jacks, to increase the depth of water - Google Patents

Method for rebuilding a hull, by the use of jacks, to increase the depth of water Download PDF

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Publication number
US3265028A
US3265028A US372249A US37224964A US3265028A US 3265028 A US3265028 A US 3265028A US 372249 A US372249 A US 372249A US 37224964 A US37224964 A US 37224964A US 3265028 A US3265028 A US 3265028A
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United States
Prior art keywords
hull
section
rebuilding
jacks
depth
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Expired - Lifetime
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US372249A
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English (en)
Inventor
Matsuse Takakuni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Engineering and Shipbuilding Co Ltd
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Mitsubishi Engineering and Shipbuilding Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B83/00—Rebuilding or retrofitting vessels, e.g. retrofitting ballast water treatment systems
    • B63B83/10—Rebuilding or retrofitting vessels, e.g. retrofitting ballast water treatment systems for increasing cargo capacity

Definitions

  • the present invention relates to a method for rebuilding a hull, especially for increasing the depth of the bull to increase the tonnage of the ship.
  • the upper deck on that part of the hull which is subjected to rebuilding is, first, divided into small parts, which are either landed by means of a crane or the like or placed temporarily on that portion of the upper deck not subjected to such rebuilding.
  • new units or sections to be used for the increase of the'hull depth are carried onto said part of the hull.
  • said small parts of the upper deck are carried back onto said fixed units by means of a crane, being joined thereto by welding.
  • An object of the present invention is to eliminate the disadvantages to which reference has been made.
  • Another object of the invention is to rebuild the hull of a ship to increase the depth of the upper middle hull, and which does not require that the upper middle hull be divided into small herets.
  • a further object of the invention is to use commercially available jacks for lifting the upper middle hull, whose depth is to be increased, and to lessen the required working time of cranes.
  • Still another object of the invention is to provide a method for rebuilding the hull of a ship to increase the hull depth, and which may be performed even when the ship is floating.
  • Yet a further object of the invention is to provide a method for increasing the hull depth of a ship and in which the principal longitudinal members of the ship hull are not subjected to any changes during the first step of the rebuilding of the hull, so that no reinforcements are required to maintain the strength of the hull during the rebuilding.
  • a method for rebuilding the hull of a ship is provided and is characterized in that the part of the hull to be subjected to rebuilding is divided into two parts, namely an upper middle hull and a U- shaped lower hull.
  • a plurality of .arms are fixed to the deck of the upper middle bull in rows extending longitudinally of the two longitudinal edges thereof, and in longitudinally spaced relation.
  • An equal number of guide members are erected on the decks of the upper side parts of the U-shaped lower hull, each being adjacent one of said arms. These guide members are arranged to reice ceive jacks supporting the arms, and are further formed to be releasably interconnected with the arms.
  • the upper middle hull is then jacked up step-by-step, with the arms being retained and supported on the guide members between each jacking step.
  • a new unit or section is slid on rollers along the longitudinal bulk heads of the lower hull into the space provided by the jacking up of the upper middle hull.
  • This new section is then joined with the upper middle hull and with the lower hull.
  • the upper side parts of the U-shaped lower hull are then rebuilt in accordance with conventional methods.
  • FIG. 1 is a cross-sectional view of an upper part of a hull jacked up, showing an embodiment of the present invention
  • FIG. 2 is an enlarged section taken along the line IIII in FIG. 1,
  • FIG. 3 is a cross-sectional view showing schematically the joining of a unit or section to be used for increasing the hull depth
  • FIG. 4 is a profile of the hull shown in FIG. 3.
  • a hull 1 which is subjected to rebuilding to increase the hull depth is divided, in the vicinity of mid-ship, into two parts, namely, a fore body and an after body.
  • the hull 1 is, further, divided by cutting along a horizontal plane indicated by line 2 and along transversely extending vertical planes at each end of line 2 into two parts.
  • These parts are an upper mid-ship hull 3 and a lower U-shaped hull 4 having upper side sections 6 and 7. This completes the first step of the method of rebuilding in accordance with the present invention.
  • a preselected number of arms 8 are fixed along each longitudinal edge of the upper deck 9 of the upper mid-shap hull 5. These arms are aligned longitudinally of the hull and are in longitudinally spaced relation with each other.
  • An equal number of guide members 10 are fixedly erected on the respective upper decks 11 and 12 of the upper side sections 6 and 7 of the U-shaped lower hull 4, each guide member 10 being adjacent a respective .arm 8.
  • Guide members 10 have channel-shaped cross sections facing toward and receiving the horizontally extending portions of arms 8.
  • the flanges of guide members 10 are formed with uniformly spaced apertures 13 therealong for a purpose to be described.
  • the jacking up of bull mid-section 5 is effected in a step-by-step manner.
  • the upper hull mid-section 5 is lifted up a predetermined amount, and then pins are inserted through holes 13 in arms 10 and through a hole (not shown) in the outer end of the horizontal portion of each arm 10.
  • jacks 14, in the retracted condition are reset in engagement with the under surfaces of the horizontal portions of arms 8, and with the jacks being supported on pins extended through the apertures 13.
  • step-by-step operation is continued until hull mid-ship section 5 has been raised to a height suflicient for placing the new section, unit, or block 16 thereunder.
  • the section or unit 16 which has been designed and finished beforehand in accordance with the rebuilding schedule, is transported by means of a crane or the like to the entrance to the space between elevated hull section 5 and lower hull 4. Rollers 18 are placed beneath section 16 in alignment with the longitudinal bulk heads 17 of the section 16 and in alignment with the longitudinal bulk heads 15 of the lower hull 4. By means of a winch and a cable 20, the section 16 is then pulled into position beneath the elevated section 5. The rollers 18 are then removed and the lower side of section 15 is united with the lower hull 4. The section 5 is then lowered onto the section 16 and the jacks and arms 18 are released so that section 5 may be united to the upper surf-ace of section 16. The arms 8 and guides are then removed.
  • the upper side sections 6 and 7 of the U-shaped lower hull 4 after being cut transversely into smaller units, are removed for insertion of rebuilding sections therebeneath, using a known method involving cranes. This completes the rebuilding of the hull.
  • the lifting of the upper hull mid-section 5 is performed by means of the jacks 14, which push upward the arms 8, and are kept at the determined height on the guide members 10 by means of pins holding the jacks.
  • the arms being thus engaged with the guide members, said lifting is easily and properly performed, and, moreover, smoothly and accurately without any transverse or longitudinal shifting.
  • the inserting and fixing of the added section 16 is performed, through the rollers 18, on the longitudinal bulkheads in the lower hull 4, and this eases the work substantially.
  • the upper hull mid-section 5 1 divided from the upper part of the hull is provided with many equipments thereon, and yet lifted with these equipments still fixed. Therefore, the outfitting work can be performed together with the hull work. Moreover, damage to the upper hull construction can, favourably, be prevented because of the upper hull not being subjected to cutting into smaller parts.
  • the rebuilding of the hull to increase the depth of the hull can be smoothly and accurately performed by the use of simple installations either in a ship brought alongside a quay or in a dry dock. Besides, a remarkable decrease in the number of man-hours and also a substantial shortening of the term of work can be obtained. This will bring, favourably, the reduction of the rebuilding cost.
  • the jacks 14 may be any commercially available jacks suitable for the purpose.
  • the jacks actually illustrated, at least partly, in the drawings, are those sold under the name of Riken Yuatsu Power Jacks (Riken Oil Pressure Power Jacks) and manufactured by Riken Seiki Kabushiki Kaisha (Riken Precise Machine Manufacturing Co., Ltd.) of Japan.
  • a method of rebuilding the hull of a ship to increase the depth of the hull comprising, the steps of dividing the original hull to form an upper central hull section extending longitudinally of the ship and a U-shaped lower hull section having upper side portions extending longitudinally adjacent the longitudinal edges of the upper middle hull; affixing a plurality of arms to the upper deck of the central hull section extending in rows with each row being along one longitudinal edge of the upper hull section; erecting an equal number of upwardly extending guide members on the upper decks of the upper side sections of the lower hull, each adjacent one of said arms; mounting jacks on said upright guide members in engagement with said arms; operating said jacks to lift said upper central hull section step-by-step; between each jacking step, restraining said arms against downward movement along said upright guide members; when said upper central hull section is at an elevation sufficient to provide for movement of a new central hull section therebeneath, mounting said new central hull section on rollers in engagement with the longitudinal

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Working Measures On Existing Buildindgs (AREA)
US372249A 1963-06-18 1964-06-03 Method for rebuilding a hull, by the use of jacks, to increase the depth of water Expired - Lifetime US3265028A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3081963 1963-06-18

Publications (1)

Publication Number Publication Date
US3265028A true US3265028A (en) 1966-08-09

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ID=12314297

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US372249A Expired - Lifetime US3265028A (en) 1963-06-18 1964-06-03 Method for rebuilding a hull, by the use of jacks, to increase the depth of water

Country Status (5)

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US (1) US3265028A (da)
DK (1) DK112922B (da)
GB (1) GB1036645A (da)
NL (1) NL6406658A (da)
SE (1) SE319989B (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397663A (en) * 1966-03-16 1968-08-20 Mitsubishi Heavy Ind Ltd Method for rebuilding the hull of a ship to increase its tonnage
US3738303A (en) * 1970-05-25 1973-06-12 Nippon Kokan Kk Method of building boats with twin hulls
USRE50076E1 (en) * 2015-12-30 2024-08-13 Hyundai Heavy Industries Co., Ltd. Liquefied gas carrier

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1076068A (en) * 1912-04-27 1913-10-21 John C Schleicher Ship.
US3111925A (en) * 1961-06-06 1963-11-26 Shin Mitsubishi Jukogyo Kk Method for increasing tonnage of ship by utilizing dock

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1076068A (en) * 1912-04-27 1913-10-21 John C Schleicher Ship.
US3111925A (en) * 1961-06-06 1963-11-26 Shin Mitsubishi Jukogyo Kk Method for increasing tonnage of ship by utilizing dock

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397663A (en) * 1966-03-16 1968-08-20 Mitsubishi Heavy Ind Ltd Method for rebuilding the hull of a ship to increase its tonnage
US3738303A (en) * 1970-05-25 1973-06-12 Nippon Kokan Kk Method of building boats with twin hulls
USRE50076E1 (en) * 2015-12-30 2024-08-13 Hyundai Heavy Industries Co., Ltd. Liquefied gas carrier

Also Published As

Publication number Publication date
GB1036645A (en) 1966-07-20
NL6406658A (da) 1964-12-21
SE319989B (da) 1970-01-26
DK112922B (da) 1969-01-27

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