US3416481A - Construction of ships' hulls - Google Patents

Construction of ships' hulls Download PDF

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Publication number
US3416481A
US3416481A US658863A US65886367A US3416481A US 3416481 A US3416481 A US 3416481A US 658863 A US658863 A US 658863A US 65886367 A US65886367 A US 65886367A US 3416481 A US3416481 A US 3416481A
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US
United States
Prior art keywords
portions
hull
caisson
ships
plating
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
US658863A
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English (en)
Inventor
Taylor Frederick
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.)
SWAN HUNTER GROUP Ltd
Original Assignee
SWAN HUNTER GROUP Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SWAN HUNTER GROUP Ltd filed Critical SWAN HUNTER GROUP Ltd
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Publication of US3416481A publication Critical patent/US3416481A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 
    • B63B71/00—Designing vessels; Predicting their performance

Definitions

  • the invention provides a method of constructing a ships hull from at least two prefabricated portions wherein said portions are brought into alignment while afloat and temporarily secured together to form a region of jointing between them, temporary watertight sealing means is applied to the exterior of said region below the waterline to form an access space, the region of jointing is then freed from water and permanent securing of said portions is performed by a watertight jointing operation at least partly applied to the exterior of said portions from within said temporary sealing means access space.
  • Said temporary sealing means may be arranged to provide access from above the waterline for a welding operation to be performed on the exterior of the portions to secure said portions permanently together.
  • Said temporary sealing means may be adjusted in buoyancy to bear against the hull portions and to form seals therewith at opposite sides of the region of jointing, and further, saidportions may be held spaced apart at said region so that below the waterline hull plates may be inserted and welded externally from within said access space.
  • the invention further provides apparatus for performing the aforesaid method, comprising a caisson having a generally horizontal intermediate section and respective upwardly extending end sections, watertight seals on said caisson arranged to bear against the hull portions at the region of jointing, a transversely extending compartment within said intermediate section, said end sections extending above the waterline of the hull portions and at least one of said end sections providing an external access passage to said compartment.
  • the caisson comprises a central gallery extending between the end sections and providing access by an operator to the exterior of the jointing region, and buoyancy chambers arranged on both sides of said gallery for floatation of the caisson.
  • the hull portions are brought into alignment while afloat and temporarily secured together to form a region of jointing between them, temporary watertight sealing means being applied to the exterior of said region below the waterline to form an access space, the region of jointing then being freed from water and permanent securing of said portions being performed by a watertight jointing operation at least partly applied to the exterior of said portions from within said temporary sealing means access space.
  • the method may be carried out by severing an end section of a first portion after completing the construction of said portion, moving the severed section towards the launch ing end of the slipway or in the dry dock after launching said first portion, and building another portion of the hull permanently on to said severed section,
  • the junction at which such union is to be effected consists of two ends which were built at the same time and as parts of a unit, and thereafter cut apart, so that said two ends perfectly match with one another when brought together and can be united without difliculty.
  • the alignment and temporary connection of the hull portions may be obtained by the provision, at the ends to be joined, of suitable mating internal structure.
  • suitable mating internal structure For example, in a ship of the larger size under consideration, there may be provided several, for example up to seven, longitudinal girders, the ends of which in the two portions may be adapted for securing together in alignment prior to the completion of the exterior plating.
  • a caisson having a generally horizontal intermediate section and respective upwardly extending end sections, adapted to extend transversely beneath the assembled ends of two portions of a ships hull to provide an external access passage to the bottom plating.
  • caisson including the upwardly extending ends, may comher preferably without division from end to end and adapted to be drained of water after being submerged to form an access gallery, and two lateral chambers, preferably sub-divided, adapted to serve as buoyancy tanks.
  • the upper parts of said lateral chambers are provided along their entire length with substantial sealing strips adapted to seal against the bottoms of the portions of the hull when the caisson, after having been submerged to be located beneath said portions, is at least partially pumped out so as to float up into firm contact with the two ends of said hull portions.
  • FIG. 4 is a detail section showing internal securing means between the two hull portions of FIG. 3.
  • At least one upwardly extending end 12 is provided with an access ladder 27 for the working compartment 14, and pipe connections 28 for the filling and emptying of the several buoyancy tanks comprised in the lateral compartments 15.
  • the length of the caisson needs to be adapted to each individual hull unless it happens that two hulls of which portions are to be joined together have exactly the same section.
  • such adaption will in general require only cutting out or insertion of sections of the base portion 11 of the caisson to modify its length.
  • one hull portion may be built on a slipway or in a dry dock in extended form so that a short length of the plating and internal stress-bearing structure of a second hull portion is erected integrally with it.
  • portion H1 may have been constructed integrally with the end region of portion H2 as far as the plane C.
  • FIG. 4 shows, at their junction internal ribs R1, R2 of the respective hull portions have flanges F secured together by bolts E after a packing strip D has been interposed between the flanges.
  • the external plating extends continuously across the junction of the hull portions and before launching of the portion H1 the end region of the portion H2, completion of which is to follow, is detached by removal of the bolts E and severance of the external plating by a flame-cutting operation.
  • the means securing a pair of portions together prior to welding for example the ribs R1, R2, are arranged to leave a gap between the external plates of the respective portions. The gap is then filled by the welding of further plates between the hull portions.
  • the caisson To apply the caisson to a ships bottom for the purpose described, it is partially submerged and displaced along the length of one of the portions of the ships hull, or alternatively one of the ends may be totally submerged and passed transversely beneath the ships hull, the buoyancy then being adjusted to level the caisson and float it up into engagement with the ships bottom as shown in the drawings.
  • the caisson may be made so buoyant relative to the hull that the differential water pressure will create a completely watertight joint between the sealing strips 22 and the existing plating of the hull, prior to the working compartment 14 being completely emptied of water.
  • the work of completing the joining together of the two portions by welding can then proceed by men working in dry conditions and under normal atmospheric pressure in compartment 14 which is readily accessible from above the waterline by means of at least one of the upturned ends of the caisson, and the access ladder 27 therein.
  • the various pumping operations may be carried out on a tender or tenders.
  • the working compartment 14 may be pumped clear of water by way of a suction hose lowered to the floor 17, or a sump therein, through one of the upwardly extending ends of the caisson, and selective filling or emptying of the buoyancy tanks may be carried out by means of pump hoses connected to the piping 28.
  • the caisson When the welding together below the waterline of the two portions of the hull has been completed, the caisson may be removed by reducing its buoyancy sufiiciently to enable it to be displaced from beneath the hull either lengthwise or transversely, and it is then only necessary to remove the brakckets A, G, W to provide a unitary hull completely faired at the joint.
  • Apparatus for constructing a ships hull from at least two prefabricated portions comprising a caisson having a generally horizontal intermediate section and respective upwardly extending end sections, watertight seals on said caisson arranged to bear against the hull portions at the region to be jointed, a transversely extending compartment within said intermediate section, said end sections extending above the waterline of the hull portions and at least one of said end sections providing an external access passage to said compartment.
  • the caisson comprises a central gallery extending between the end sections. and providing access to the exterior of the jointing region, and buoyancy chambers arranged on both sides of said gallery for floatation of the caisson.
  • Apparatus according to claim 10 further comprising pipe connections extending through at least one of said end sections to said central gallery for emptying water therefrom.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Revetment (AREA)
  • Nozzles (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Bridges Or Land Bridges (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
US658863A 1966-08-11 1967-08-07 Construction of ships' hulls Expired - Lifetime US3416481A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB36018/66A GB1174604A (en) 1966-08-11 1966-08-11 Improvements relating to the Construction of Ships' Hulls

Publications (1)

Publication Number Publication Date
US3416481A true US3416481A (en) 1968-12-17

Family

ID=10384056

Family Applications (1)

Application Number Title Priority Date Filing Date
US658863A Expired - Lifetime US3416481A (en) 1966-08-11 1967-08-07 Construction of ships' hulls

Country Status (7)

Country Link
US (1) US3416481A (enExample)
DE (1) DE1531594C3 (enExample)
ES (1) ES344319A1 (enExample)
GB (1) GB1174604A (enExample)
NL (1) NL145178B (enExample)
NO (1) NO124633B (enExample)
SE (1) SE352858B (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611968A (en) * 1968-09-12 1971-10-12 Mitsubishi Heavy Ind Ltd Watertight floating boxes for underwater work on floating bodies
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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3370565A (en) * 1966-07-29 1968-02-27 Mitsubishi Heavy Ind Ltd Method and an apparatus for fixing a waterproof band in order to cut or join a structure floating on the water

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3370565A (en) * 1966-07-29 1968-02-27 Mitsubishi Heavy Ind Ltd Method and an apparatus for fixing a waterproof band in order to cut or join a structure floating on the water

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611968A (en) * 1968-09-12 1971-10-12 Mitsubishi Heavy Ind Ltd Watertight floating boxes for underwater work on floating bodies
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
ES344319A1 (es) 1968-10-16
NO124633B (enExample) 1972-05-15
NL145178B (nl) 1975-03-17
DE1531594C3 (de) 1973-01-04
NL6711062A (enExample) 1968-02-12
SE352858B (enExample) 1973-01-15
GB1174604A (en) 1969-12-17
DE1531594A1 (de) 1970-01-22

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