EP1038763A1 - Cover or deck structure for marine vessel - Google Patents

Cover or deck structure for marine vessel Download PDF

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Publication number
EP1038763A1
EP1038763A1 EP98961355A EP98961355A EP1038763A1 EP 1038763 A1 EP1038763 A1 EP 1038763A1 EP 98961355 A EP98961355 A EP 98961355A EP 98961355 A EP98961355 A EP 98961355A EP 1038763 A1 EP1038763 A1 EP 1038763A1
Authority
EP
European Patent Office
Prior art keywords
top plate
cover
shaped
beams
deck structure
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.)
Withdrawn
Application number
EP98961355A
Other languages
German (de)
French (fr)
Other versions
EP1038763A4 (en
Inventor
Masaru Hirata
Masaki Fuziki
Syuuichi Ishinabe
Hiroshi Yamanaka
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.)
MacGregor Kayaba Ltd
Original Assignee
MacGregor Kayaba 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 MacGregor Kayaba Ltd filed Critical MacGregor Kayaba Ltd
Publication of EP1038763A1 publication Critical patent/EP1038763A1/en
Publication of EP1038763A4 publication Critical patent/EP1038763A4/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B19/00—Arrangements or adaptations of ports, doors, windows, port-holes, or other openings or covers
    • B63B19/12—Hatches; Hatchways
    • B63B19/14—Hatch covers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B3/48—Decks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B3/26—Frames
    • B63B2003/265—Frames comprising open profiles, e.g. U- or gutter-shaped, and forming substantially closed channels together with the plate to which they are attached

Definitions

  • the present invention relates to improvements in a vessel cover or deck structure.
  • top surface of flange of the letter "L" shaped angle member which is welded to the rear surface of the top plate of the hatch cover has the tendency to be accumulated particulate material which is stored in bulk in the hold. Thus the difficulty of cleaning has become a great problem.
  • the present invention is proposed to solve the above problems.
  • the present invention is provides a vessel cover or a deck structure which comprises "U” or “V” shaped beams are secured by welding in fixed intervals to the rear surface of a top plate so that the open face of the beams closely adheres to the top plate.
  • the rigidity of the top plate and the buckling strength is increased.
  • the pitch disposition of the beams may become large.
  • welding positions are only those sections which face the outside, welding operations are simplified and to that degree the deformations as a result of welding are reduced. Thus any post-processing to remove deformations is easy.
  • the open face of the beam is in an occluded box form, no accumulation of particulate material on the beam occurs and to that degree maintenance such as painting is easy.
  • buckling strength may be effectively improved without great increases in the density of the interval of the disposed beams.
  • reference numeral 1 denotes a hatch opening which is provided with a hatch cover 3 which opens and closes the opening 1 in the peripheral adjoining portion 2.
  • the hatch cover 3 is formed, for example, from a pair of covers.
  • As a hatch cover side rolling types, pontoon types or the like are known in the art.
  • a beam 5 which is "V” or “U” shaped in cross section is secured by welding in mutually parallel intervals of a certain pitch to the rear surface of the top plate 4 of the hatch cover 3.
  • Both legs 5b of the "V" or "U” shaped beam 5 are fixed by fillet welding on the respective outer sides so that the open face 5a of the beam is closely attached to the top plate 4.
  • the "V" or "U” shaped beam 5 is formed in a box shape with the top plate 4 when it is welded to the rear surface of the top plate 4. Since these beams 5 increase buckling strength in a direction parallel to the face of the top plate 4, as shown in Fig. 2, the beam intend may be increased in comparison with the conventional angle member.
  • Fig. 3 shows the relationship of beam pitch with the size of stress when the top plate 4 generates a buckling with respect to the direction parallel to its face.
  • the pitch is large, buckling is unlikely to occur.
  • the buckling strength is conspicuously increased. This fact has been confirmed experimentally. If a range is made smaller than above the range, the beam interval increases in density. However the increase in buckling strength is not proportional to the increase in the density of the pitch and the overall effect is small.
  • this embodiment given above is a beam 5 which is "V" or "U” shaped in cross section, however the invention is in not limited in this respect, and of course may be in the form of an open trapezoid, half-round section or rectangle.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Bridges Or Land Bridges (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

A cover or deck structure for marine vessels. Beams (5) having a U-shaped or V-shaped cross section are welded and fixed to a back surface of a top plate (4) at predetermined intervals with opened surfaces thereof in close contact with the top plate (4). The cover or deck is enhanced in rigidity, reduced in welding distortion and improved in its workability.

Description

    FIELD OF THE INVENTION
  • The present invention relates to improvements in a vessel cover or deck structure.
    • BACKGROUND OF THE INVENTION
  • Up until the present, apart from the mainframe, additional strengthening angle members, bulk plate, flat bars or the like have been secured by welding in fixed intervals to the rear surface of a top plate in order to maintain the rigidity of the top plate of a hatch cover for example.
  • Deformations are occurred in the top plate of the hatch cover due to the load of the cargo containers or the pounding of seawater from above. As a result, in all regions surrounded by such additional strengthening members, compression is applied in both in the longitudinal and transverse directions parallel to the top plate surface. Thus the top plate which is surrounded by the mainframe has a tendency to undergo partial buckling. The problem is occurred with respect to the car deck of vessels onto which the weight of vehicles loaded on the vessels.
  • In order to create a certain buckling strength in the top plate, it is necessary to make the intervals (pitch) between these additional strengthening members as small as possible. As a result, the welded spots become extremely numerous and the problem has arisen that productivity is reduced.
  • Furthermore as shown in Fig.4, in order to fillet weld the top plate 10 for example on both sides of the abutting distal end of the angle member 11, although this is the same for all types of additional strengthening members, the problem of large deformations easily occurring has arisen due to the top plate 10 undergoing welding distortion in particular when the pitch is small.
  • It is extremely difficult to weld without generating welding distortion. Even if the deformation is removed by subsequent processing, the process requires considerable skill and processing time and, as a result, efficiency suffers.
  • Furthermore the top surface of flange of the letter "L" shaped angle member which is welded to the rear surface of the top plate of the hatch cover has the tendency to be accumulated particulate material which is stored in bulk in the hold. Thus the difficulty of cleaning has become a great problem.
    • DISCLOSURE OF THE INVENTION
  • The present invention is proposed to solve the above problems.
  • The present invention is provides a vessel cover or a deck structure which comprises "U" or "V" shaped beams are secured by welding in fixed intervals to the rear surface of a top plate so that the open face of the beams closely adheres to the top plate.
  • Further and preferably, if the width of the "V" or "U" shaped beam Is taken to be "b" and the width of the beam interval is taken to be "a", then the beams are disposed so that a/b=1.5 - 3.
  • According to the present invention, since the cross section of the V' or "U" shaped beam is formed in a box shaped structure, the rigidity of the top plate and the buckling strength is increased. As a result, the pitch disposition of the beams may become large. Moreover since the welding positions are only those sections which face the outside, welding operations are simplified and to that degree the deformations as a result of welding are reduced. Thus any post-processing to remove deformations is easy. Furthermore since the open face of the beam is in an occluded box form, no accumulation of particulate material on the beam occurs and to that degree maintenance such as painting is easy. Also buckling strength may be effectively improved without great increases in the density of the interval of the disposed beams.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Fig. 1 is a schematic view showing a first embodiment of the present invention.
  • Fig. 2 is a cross sectional view of the main components of the present invention.
  • Fig. 3 is a view showing the characteristics of the buckling stress.
  • Fig. 4 is a cross sectional view of a conventional example.
    • PREFERRED EMBODIMENTS OF THE INVENTION
  • The embodiments of the present invention as adapted to a hatch cover will be explained below with reference to the accompanying drawings.
  • In Fig.1, reference numeral 1 denotes a hatch opening which is provided with a hatch cover 3 which opens and closes the opening 1 in the peripheral adjoining portion 2. The hatch cover 3 is formed, for example, from a pair of covers. As a hatch cover side rolling types, pontoon types or the like are known in the art.
  • A beam 5 which is "V" or "U" shaped in cross section is secured by welding in mutually parallel intervals of a certain pitch to the rear surface of the top plate 4 of the hatch cover 3.
  • Both legs 5b of the "V" or "U" shaped beam 5 are fixed by fillet welding on the respective outer sides so that the open face 5a of the beam is closely attached to the top plate 4.
  • The "V" or "U" shaped beam 5 is formed in a box shape with the top plate 4 when it is welded to the rear surface of the top plate 4. Since these beams 5 increase buckling strength in a direction parallel to the face of the top plate 4, as shown in Fig. 2, the beam intend may be increased in comparison with the conventional angle member.
  • Fig. 3 shows the relationship of beam pitch with the size of stress when the top plate 4 generates a buckling with respect to the direction parallel to its face. However the case of the "V" or "U" shaped beam 5, it is clear that, in comparison with the angle member, even if the pitch is large, buckling is unlikely to occur.
  • Furthermore this case, if the width of the "V" or "U" shaped beam 5 is taken to be "b" and the interval to the neighboring beam is taken to be "a" and the range is set a/b= 1.5 - 3, the buckling strength is conspicuously increased. This fact has been confirmed experimentally. If a range is made smaller than above the range, the beam interval increases in density. However the increase in buckling strength is not proportional to the increase in the density of the pitch and the overall effect is small.
  • In this way, if the weld pitch becomes large, the number of welding spots decreases to that degree. In addition, since both leg sections 5b of the "V" or "U" shaped beam 5 on which welding is performed are separated from one another, there is little generation of welding deformation and to that degree post-processing to eliminate any such deformation is reduced. On the other hand, since the open face of the "V" or "U" shaped beam 5 forms a closely adhering and occluded space on the rear face of the top plate 4, no accumulation of particulate material carried as cargo in bulk in the hold of the vessel occurs in the interior of the beam. Furthermore there is no necessity for cleaning, painted sections are reduced and to that degree maintenance is simplified.
  • Moreover this embodiment given above is a beam 5 which is "V" or "U" shaped in cross section, however the invention is in not limited in this respect, and of course may be in the form of an open trapezoid, half-round section or rectangle.
  • Moreover it is possible to adapt the present invention in the same way not only to a hatch cover but also to a car deck or the like.

Claims (2)

  1. A vessel cover or a deck structure comprising "U" or "V" shaped beams which are secured by welding in fixed intervals to the rear surface of a top plate so that the open face of the beams closely adheres to the top plate.
  2. A vessel cover or a deck structure as defined in Claim 1 where in the beams are disposed so that the relationship a/b= 1.5-3 is satisfied where "a" is a beam interval and "b" is a width of the "U" or "V" shaped beam.
EP98961355A 1997-12-16 1998-12-16 Cover or deck structure for marine vessel Withdrawn EP1038763A4 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP34671197 1997-12-16
JP34671197 1997-12-16
PCT/JP1998/005674 WO1999030961A1 (en) 1997-12-16 1998-12-16 Cover or deck structure for marine vessel

Publications (2)

Publication Number Publication Date
EP1038763A1 true EP1038763A1 (en) 2000-09-27
EP1038763A4 EP1038763A4 (en) 2002-10-16

Family

ID=18385300

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98961355A Withdrawn EP1038763A4 (en) 1997-12-16 1998-12-16 Cover or deck structure for marine vessel

Country Status (6)

Country Link
EP (1) EP1038763A4 (en)
KR (1) KR100425227B1 (en)
CN (1) CN1113773C (en)
AU (1) AU1681999A (en)
PL (1) PL193747B1 (en)
WO (1) WO1999030961A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015001776A1 (en) * 2013-07-03 2015-01-08 Oshima Shipbuilding Co., Ltd. A hatch cover for an ocean-going ship

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10209376A1 (en) * 2002-03-02 2003-09-11 Hatlapa Uetersener Maschf Ship winch
KR100993800B1 (en) * 2008-12-16 2010-11-11 수림산업(주) Deck plate
KR101180822B1 (en) 2010-10-12 2012-09-07 스코트라 주식회사 Assemblable pontoon
CN102658854A (en) * 2012-04-25 2012-09-12 华南理工大学 Light medium and large ship hatch cover
CN106314678B (en) * 2016-08-29 2018-08-03 南通中远海运川崎船舶工程有限公司 A kind of structure preventing main hull brittle fracture
RU2724042C1 (en) * 2019-10-21 2020-06-18 Федеральное государственное унитарное предприятие "Крыловский государственный научный центр" Dry cargo ship hatch cover

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB164665A (en) * 1920-10-12 1921-06-16 Clarence William Crossley Improvements in the construction of floating vessels
FR1543187A (en) * 1966-12-28 1968-10-25 Adspornaut Flexible cellular system for metal yacht framing
JPS5275790A (en) * 1975-12-20 1977-06-25 Hitachi Zosen Corp Ship

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49101492U (en) * 1972-12-22 1974-08-31
JPS50136887A (en) * 1974-04-17 1975-10-30
JPS5273491A (en) * 1975-12-16 1977-06-20 Hitachi Zosen Corp Vessel
JPS60186247A (en) * 1984-03-07 1985-09-21 Hashino Yakuhin:Kk Preparation of saltless pickle
JPS6181492U (en) * 1984-11-05 1986-05-30

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB164665A (en) * 1920-10-12 1921-06-16 Clarence William Crossley Improvements in the construction of floating vessels
FR1543187A (en) * 1966-12-28 1968-10-25 Adspornaut Flexible cellular system for metal yacht framing
JPS5275790A (en) * 1975-12-20 1977-06-25 Hitachi Zosen Corp Ship

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 001, no. 134 (M-045), 5 November 1977 (1977-11-05) -& JP 52 075790 A (HITACHI ZOSEN CORP), 25 June 1977 (1977-06-25) *
See also references of WO9930961A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015001776A1 (en) * 2013-07-03 2015-01-08 Oshima Shipbuilding Co., Ltd. A hatch cover for an ocean-going ship
JP2016527114A (en) * 2013-07-03 2016-09-08 株式会社大島造船所 Hatch cover for marine vessels

Also Published As

Publication number Publication date
AU1681999A (en) 1999-07-05
EP1038763A4 (en) 2002-10-16
PL193747B1 (en) 2007-03-30
KR100425227B1 (en) 2004-03-30
PL341011A1 (en) 2001-03-12
KR20010033144A (en) 2001-04-25
CN1113773C (en) 2003-07-09
CN1282300A (en) 2001-01-31
WO1999030961A1 (en) 1999-06-24

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