US3675606A - Method of constructing marine float structures - Google Patents

Method of constructing marine float structures Download PDF

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Publication number
US3675606A
US3675606A US40520A US3675606DA US3675606A US 3675606 A US3675606 A US 3675606A US 40520 A US40520 A US 40520A US 3675606D A US3675606D A US 3675606DA US 3675606 A US3675606 A US 3675606A
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US
United States
Prior art keywords
ship
pontoon
water surface
composite
portions
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 - Lifetime
Application number
US40520A
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English (en)
Inventor
Isoe Takezawa
Masataro Muto
Koichi Hori
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 Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Publication of US3675606A publication Critical patent/US3675606A/en
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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 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/34—Pontoons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B71/00—Designing vessels; Predicting their performance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
    • B63B73/10—Building or assembling vessels from prefabricated hull blocks, i.e. complete hull cross-sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
    • B63B73/60—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms characterised by the use of specific tools or equipment; characterised by automation, e.g. use of robots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B73/00—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms
    • B63B73/40—Building or assembling vessels or marine structures, e.g. hulls or offshore platforms characterised by joining methods
    • B63B73/43—Welding, e.g. laser welding

Definitions

  • the composite pontoon is caused to sink down in the water so that said first divided portion of the ship can float of its own accord on the water surface.
  • the second divided portion of the ship is transported on the water surface using the same pontoon as mentioned above.
  • a part of the composite pontoon is separated from the remaining body and allowed to sink down in the water while said second divided portion of the ship is held by the remaining portion of the pontoon
  • the separated part of the pontoon is used to float said first divided portion of the ship on the water surface, thereby combining both divided portions of the ship in a single unit on the water surface.
  • the present invention relates to a method of ship building and more particularly to a method of constructing a largesized ship structures such as a marine vessel by utilizing economical equipment that does not use an inclined ship building base or dock.
  • the height h of the surface of the ship building base 01 mounted on a dry-land type foundation from the water surface (L.W.L.) at low tide should be at least 4 meters by adding an allowance of the water line (draft) about I m to the difference 3 In between the periods of low and high tides.
  • a hull S constructed on the ship building base 01 can be transferred onto the pontoon only by maintaining the upper surface of the pontoon P and the surface of the ship building base 01 at equal heights. Consequently it becomes necessary to have the pontoon P with the hull mounted thereon exposed at least 4m above the water surface.
  • the entire height H of the pontoon with the addition of deepness below the draft line should be at least twice as much as the above-mentioned it, that is, at least about 8 m. Needless to say the basis of this calculation has been referred to in the case of using a pontoon corresponding to the entire length ofthe hull S.
  • the conventional methods require the pontoon P itself to be sufficiently large-sized so that the manufacturing cost becomes very high. Also, a large-sized hull S that is constructed all on a horizontal ship building base is rather difficult to be transferred onto the pontoon P, and is thus an extremely complicated and time consuming operation.
  • the object of the present invention is to provide a method of manufacturing a large-sized building base without the above-mentioned disadvantages.
  • a further object of the present invention is to provide a method of constructing marine float structures, comprising the construction of large-sized marine float structures such as large-sized tankers in a suitable number of separately divided portions on a horizontal ship building base by utilizing the facilities of a quay and the use of composite pontoons formed of many up-and down or forwardly and/or backwardly separable portions wherein; flrst of all, the first divided portion of the hull is transported onto the water surface; then the composite pontoon is caused to sink down in the water to launch said first divided portion; subsequently, the second divided portion is transported onto the water surface using the same composite pontoon but in this case a portion of the composite pontoon is separated therefrom so as to sink down in the water and said second divided portion is held in condition exposed above the water surface by means of the remaining portions of the composite pontoon; and simultaneously said first divided portion is caused to float exposed above the water using said separated portion of the pontoon so that both divided portions can be jointed on the water surface.
  • FIG. I is a side view showing an example of a launching procedure using a pontoon of the conventional type.
  • FIGS. 2 through 7 are views showing a construction of a marine float structure according to a first embodiment of the present invention
  • FIG. 2 is a perspective view of a composite pontoon.
  • FIG. 3 is a side view of a hull which is constructed in divided form.
  • FIGS. 4 through 7 are side views showing examples of a construction steps.
  • FIGS. 8 through 10 show a second embodiment of the present invention.
  • FIG. 8 is a perspective view of another composite pontoon.
  • FIG. 9, and 10 are side views showing examples of construction steps.
  • B indicates an almost horizontal ship building base constructed by utilizing a quay, and the hull S is to be constructed thereon in the form of a number of divided portions in the direction of fore and aft parts of the ship.
  • the height of the ship building base B is determined in such a manner that the upper surface of the base 8 cannot be immersed in the water at high tide or by the high waves.
  • the height h of the ship building base B from the water surface at low tide will be computed to be about 4 m.
  • the character P indicates the composite pontoon for use in this embodiment and said pontoon P consists of two unit pontoons P and P which are overlapped in the manner of being separated from each other. These unit pontoons P and I are partitioned inside in the form of a plurality of areas to constitute a number of float chambers l and 2.
  • float chambers l and 2 are adapted to communicate with respective pipes for pouring and discharging water (not shown in the drawing). so that it is possible to adjust the buoyancy and trimming of each pontoon by pouring water into, or discharging it from, each float chamber.
  • water pouring and discharging apparatus is of conventional construction.
  • the size of the composite pontoon P is such that its length L is about one half of the length of a vessel to be constructed.
  • Its depth H is about two times the above mentioned height h namely, about 8 m, in order that the upper surface of the composite pontoon may be held in level with the surface of the ship building base B even when tidal position is the lowest and the head drop between the water surface and the surface of the ship building base B amounts to a maximum (about 4 m).
  • the hull S is constructed on the ship base building B base in the form of four divided parts such as the fore part F, fore half part tank TF, aft half part tank TA and aft part A, as shown in FIG. 3.
  • the composite pontoon P is brought forwardly of the ship building base B and then ballast water is poured into, and discharged from, each float chamber I and 2 in a suitable manner so that the upper surface of the composite pontoon P is adjusted to assume the same height as the surface of the ship building berth.
  • the fore part F and the fore half part tank TF have been mounted on the composite pontoon by transfer, they are jointed by welding or the like thereon to complete the fore part SF of the hull.
  • the fore part F and the fore half part tank TF are jointed after they have been mounted on the composite pontoon to facilitate their mounting on the composite pontoon P. If necessary, both may be jointed on the ship building base B beforehand and it is also possible to construct them in a body from the beginning without preparing them in divided form.
  • the combined unit is transported onto the water surface by means of a towboat or the like while mounting it on the pontoon. Then ballast water is poured into each float chamber 1 and 2 of the pontoon in a suitable position so that it can sink down and the fore ship portion SF only can float of its own accord on the water surface.
  • the aft half part tank TA and the apt part A are mounted on the pontoon by transfer in exactly the same manner using the same pontoon as mentioned above and they are jointed together to complete the aft ship portion SA, which is then transported onto the water surface by means of a towboat or the like.
  • ballast is suitably poured into each float chamber 2 of the lower half unit pontoon P constituting the composite pon pontoon that only the unit pontoon P is caused to sink down in the water and be separated from the other unit pontoon P,
  • the fore ship portion SA is destined to be supported by the buoyancy of the unit pontoon l Then only but the whole body is allowed to remain as exposed above the water surface except that the height from the water surface is reduced.
  • the separated unit pontoon 2 is brought right below the fore ship portion SF by means of a towboat or the like. Then the ballast water in each float chamber 2 is suitably discharged therefrom until the fore ship portion SF is allowed to float and be exposed above the water surface.
  • both ship portions are drawn together and their corresponding joint portions are caused to engage each other so that both portions are jointed on the water surface to complete the hull S.
  • the unit pontoons P, and P are overlapped to increase the depth of this assembly to achieve the required purpose. Thereafter both pontoons are separated from each other so that the fore ship portion SF and the aft ship portion SA can float and be exposed above the water surface for achieving their joint effect.
  • the composite pontoon P consists of fine unit pontoons P,-P, which can be divided forwardly and backwardly as shown in FIG. 8.
  • this composite pontoon is illustrated to show that its length 1. is about one half of the ships length. Its depth H shows that it is about twice the height it between the surface of the ship building base and the water surface at low tide.. This is accomplished in the same manner as the aforesaid em bodiment, which has already been described in detail.
  • the hull is constructed in divided form on the ship building base, Then as shown in FIG. 9, the fore ship portion SF is transferred onto the water surface.
  • the ballast water is uniformly poured into the float chamber of each unit pontoon P,P,, to cause the pontoon P to sink down in order to permit the floating of the fore ship portion SF of its own accord on the water surface.
  • the same composite pontoon is used again to transport the aft ship portion SA onto the water surface. Under these conditions, as shown in FIG.
  • ballast water is poured into the float chamber of each unit pontoon P P and P, respectively and these unit pontoons are separated from the other unit ones P, and P, so that the fore ship portion SA is supported by the latter two unit pontoons P and P only.
  • the separated unit pontoons P,, P;, and P are suitably positioned right beneath the fore ship portion SF after which the ballast water in the float chambers of the unit pontoons P,, P; and P, are discharged therefrom to float and expose the fore ship portion SF on the water surface.
  • both portions SF and SA are drawn close to each other and jointed by welding to complete the hull S.
  • the application of this method is not limited to the construction of ships or marine vessels but it can be extensively applied to the construction of marine float structures, for example, such as transport barges, floating docks and other marine structures.
  • the present invention is intended to provide a method of manufacturing marine float structures, comprising constructing large-sized marine float structures in suitably divided form on a horizontal ship building base and using composite pontoons consisting of many up-and'down or forwardly and/or backwardly separable portions, wherein firstly, the first divided portion of the structure is transported onto the water surface, then said composite pontoon is caused to sink down in the water to permit the floating of said first divided portion of the structure of its own accord on the water surface, successively, the second divided portion of the structure is also transported onto the water surface using the same pontoon, a part of said pontoon is separated from the whole body and causing to sink down in the water, said second divided portion of the structure is held on the water surface using the remaining part of the pontoon and the same time, the firstly separated part of 5 the pontoon is used to float said first divided portion of the structure on the water surface and to support it thereon and finally, both divided portions of the structure are drawn close to each other so that they can be
  • the present invention makes it easily possible to construct structures of almost the same sizes as conventional structures using pontoons of about half sized of also conventional pontoons, thereby proving the method of the present invention to be considerably reasonable and economical.
  • each portion is separately transferred onto the pontoon for mounting thereon.
  • the operation of trans ferring portions of the structures onto the pontoon is rendered very easy.
  • a method of ship building for constructing large-sized ship structures comprising the following steps:
  • the first step includes providing at least a first ship portion and a second ship portion for constructing a ship on a ship building base, said ship building base being mounted on a dry-land type foundation;
  • the second step includes constructing the ship portions and transporting said first constructed ship portion onto a water surface using a composite pontoon as a support thereof, thereafter said composite pontoon being suck so as to float said first portion on the water surface by its own buoyancy without the aid of the composite pontoon, said composite pontoon being constructed in a horizontal stack with a plurality of individually detachable unit pontoons,
  • the height of said composite pontoon being made sufficient to compensate for the intervening height difierence between the level of the water surface and the level of the ship building base whenever either one of the ship portions is drawn from said base onto the water surface, and each of said unit pontoons layered into the composite pontoon having a sufficient buoyancy of its own to hold each of said ship portions with positive buoyancy supported from beneath;
  • the third step includes transporting said second constructed ship portion onto the water surface using said composite pontoon as a support thereof, separating the composite pontoon into its upper and lower unit pontoons, supporting said second ship portion with the upper unit pontoon and removing the lower unit pontoon therefrom;
  • the fourth step includes said first buoyant constructed shi portion being supported in a floating state on the water surface with the aid of said first sunken one of the unit pontoons after regaining its own positive buoyancy;
  • the fifth step includes both first and second floated ship portions with the aid of both first and second unit pontoons respectively being drawn to each other and welded together so as to unify them into a single ship unit while being held on the water surface.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Robotics (AREA)
  • Bridges Or Land Bridges (AREA)
  • Revetment (AREA)
  • Measurement Of Radiation (AREA)
US40520A 1969-06-05 1970-05-26 Method of constructing marine float structures Expired - Lifetime US3675606A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44044198A JPS4918394B1 (sv) 1969-06-05 1969-06-05

Publications (1)

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US3675606A true US3675606A (en) 1972-07-11

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US40520A Expired - Lifetime US3675606A (en) 1969-06-05 1970-05-26 Method of constructing marine float structures

Country Status (10)

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US (1) US3675606A (sv)
JP (1) JPS4918394B1 (sv)
DE (1) DE2027273A1 (sv)
DK (1) DK140798C (sv)
ES (1) ES380427A1 (sv)
FR (1) FR2049955A5 (sv)
GB (1) GB1278147A (sv)
NL (1) NL156100B (sv)
NO (1) NO128856B (sv)
SE (1) SE385838B (sv)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5090346A (en) * 1990-06-12 1992-02-25 Goldman Jerome L Multi-part ship construction system
CN1305731C (zh) * 2004-07-19 2007-03-21 江南造船(集团)有限责任公司 区域造船总段合拢对接方法
US20090217861A1 (en) * 2008-02-20 2009-09-03 Bram Van Cann Construction of fpdso vessel
CN103910028A (zh) * 2014-04-15 2014-07-09 南通长航船舶配件有限公司 自航耙吸挖泥船建造时的分段划分方法
CN105383643A (zh) * 2015-11-12 2016-03-09 沪东中华造船(集团)有限公司 不锈钢槽型隔舱对齐方法
CN106167078A (zh) * 2016-08-26 2016-11-30 山东南海气囊工程有限公司 一种船舶和钻井平台助浮系统及施工方法
CN106379487A (zh) * 2016-09-07 2017-02-08 广东工业大学 一种超长船体浮态制造方法
US10024013B2 (en) * 2014-10-08 2018-07-17 Giorgio Salis Floating dam or island and method of manufacture thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63315064A (ja) * 1987-06-18 1988-12-22 Kazuki Tsutsumi 注射針

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2480144A (en) * 1943-08-12 1949-08-30 John N Laycock Pontoon assembly
US2518091A (en) * 1948-07-02 1950-08-08 Dmitro C Stopkevyc Pontoon assembly
US3011252A (en) * 1957-04-02 1961-12-05 Svensson Nils Verner Method and equipment for shipbuilding
US3464212A (en) * 1966-05-13 1969-09-02 Daiho Construction Co Ltd Method of building concrete structures in water bottoms
DE1953753A1 (de) * 1968-10-24 1970-06-18 Osaka Shipbuilding Verfahren und Vorrichtung fuer den Bau schwimmender Strukturen
US3570437A (en) * 1969-02-11 1971-03-16 Texas Instruments Inc Multi-cycle ocean data gathering system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2480144A (en) * 1943-08-12 1949-08-30 John N Laycock Pontoon assembly
US2518091A (en) * 1948-07-02 1950-08-08 Dmitro C Stopkevyc Pontoon assembly
US3011252A (en) * 1957-04-02 1961-12-05 Svensson Nils Verner Method and equipment for shipbuilding
US3464212A (en) * 1966-05-13 1969-09-02 Daiho Construction Co Ltd Method of building concrete structures in water bottoms
DE1953753A1 (de) * 1968-10-24 1970-06-18 Osaka Shipbuilding Verfahren und Vorrichtung fuer den Bau schwimmender Strukturen
US3570437A (en) * 1969-02-11 1971-03-16 Texas Instruments Inc Multi-cycle ocean data gathering system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5090346A (en) * 1990-06-12 1992-02-25 Goldman Jerome L Multi-part ship construction system
CN1305731C (zh) * 2004-07-19 2007-03-21 江南造船(集团)有限责任公司 区域造船总段合拢对接方法
US20090217861A1 (en) * 2008-02-20 2009-09-03 Bram Van Cann Construction of fpdso vessel
US7823524B2 (en) * 2008-02-20 2010-11-02 Single Buoy Moorings, Inc. Construction of FPDSO vessel
CN103910028A (zh) * 2014-04-15 2014-07-09 南通长航船舶配件有限公司 自航耙吸挖泥船建造时的分段划分方法
US10024013B2 (en) * 2014-10-08 2018-07-17 Giorgio Salis Floating dam or island and method of manufacture thereof
CN105383643A (zh) * 2015-11-12 2016-03-09 沪东中华造船(集团)有限公司 不锈钢槽型隔舱对齐方法
CN105383643B (zh) * 2015-11-12 2018-04-24 沪东中华造船(集团)有限公司 不锈钢槽型隔舱对齐方法
CN106167078A (zh) * 2016-08-26 2016-11-30 山东南海气囊工程有限公司 一种船舶和钻井平台助浮系统及施工方法
CN106167078B (zh) * 2016-08-26 2018-09-18 山东南海气囊工程有限公司 一种船舶和钻井平台助浮系统及施工方法
CN106379487A (zh) * 2016-09-07 2017-02-08 广东工业大学 一种超长船体浮态制造方法

Also Published As

Publication number Publication date
DE2027273A1 (de) 1971-01-07
JPS4918394B1 (sv) 1974-05-09
FR2049955A5 (sv) 1971-03-26
GB1278147A (en) 1972-06-14
NL156100B (nl) 1978-03-15
DK140798C (da) 1980-06-09
SE385838B (sv) 1976-07-26
NO128856B (sv) 1974-01-21
DK140798B (da) 1979-11-19
ES380427A1 (es) 1972-10-16
NL7008258A (sv) 1970-12-08

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