WO1997044235A1 - Structure de renfort pour couvercle d'ecoutille de navire de charge - Google Patents

Structure de renfort pour couvercle d'ecoutille de navire de charge Download PDF

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Publication number
WO1997044235A1
WO1997044235A1 PCT/FI1996/000276 FI9600276W WO9744235A1 WO 1997044235 A1 WO1997044235 A1 WO 1997044235A1 FI 9600276 W FI9600276 W FI 9600276W WO 9744235 A1 WO9744235 A1 WO 9744235A1
Authority
WO
WIPO (PCT)
Prior art keywords
top plate
hatch cover
underside
cover top
section
Prior art date
Application number
PCT/FI1996/000276
Other languages
English (en)
Inventor
Pekka Niiniranta
Pentti Nikkola
Original Assignee
Macgregor (Fin) Oy
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 (Fin) Oy filed Critical Macgregor (Fin) Oy
Priority to PCT/FI1996/000276 priority Critical patent/WO1997044235A1/fr
Priority to AU57656/96A priority patent/AU5765696A/en
Publication of WO1997044235A1 publication Critical patent/WO1997044235A1/fr

Links

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

Definitions

  • the present invention relates to a stiffener structure for the top plate of a hatch cover employed aboard a cargo ship, said structure comprising one or a greater number of mutually parallel, elongated, bent steel sections which is/are attached essentially by its/their entire length to the underside of the top plate of the hatch cover.
  • L-sections attached by weld ⁇ ing to the underside of the hatch cover top plate.
  • Each L-section is welded from both side edges of its one flange to the underside of the hatch cover top plate.
  • Such L-sections require a great amount of surface treatment including blasting, coating and welding.
  • the inner angle (90°) of the L-section tends to gather dirt and other debris thus causing an increased risk of corrosion.
  • the stiffener structure according to the invention for a hatch cover is characterized in that the bent steel sections are attached by their two longitudinal sides to the underside of the top plate of the hatch cover, whereby the steel section and the hatch cover top plate together form a closed box section.
  • a preferred embodiment of the invention is characterized in that said steel section has two longitudinal side flanges, both inclined with respect to the underside of the hatch cover top plate as to form with the top plate an angle not smaller than 30° and not larger than 90° so that said side flanges are convergent with each other toward the apex of the section pointing downward away from the underside of the hatch cover top plate.
  • Another preferred embodiment of the invention is character- ized in that the angles of said side flanges with respect to the underside of the hatch cover top plate are unequal.
  • Still another preferred embodiment of the invention is characterized in that between said side flanges, the apex- forming edges thereof, is adapted an essentially planar lower web which is aligned essentially parallel with respect to the underside of the hatch cover top plate.
  • the finishing opera- tions of the stiffener structure are reduced and signifi ⁇ cantly eased over those required by a conventional structure.
  • a single "trough"-shaped steel section replaces two conventionally used L-sections.
  • the length of seams to be v/elded is halvec 1 with respect to the prior art.
  • the structure is free from points tending to gather dirt or subject to corrosion.
  • Figure 1 shows a portion of a hatch cover top plate strengthened with conventional stiffeners
  • Figure 2 shows the conventional structure of Fig. 1 in an end view of the hatch cover
  • Figure 3 shows a stiffener structure according to the invention in a similar view with that of Fig. 1;
  • Figure 4 shows the structure of Fig. 3 in an end view of the hatch cover
  • Figure 5 shows another stiffener structure according to the invention in a view similar to that of Figs. 1 and 3;
  • Figure 6 shows the structure of Fig. 5 in an end view of the hatch cover
  • a conventional embodiment is shown for stiffening the top plate 1 of a hatch cover.
  • To the underside of the hatch cover top plate advantageously by welding, are attached elongated, mutually parallel aligned L-shaped steel sections 2.
  • the L-sections are placed so that the wider flange of the L-section will be aligned essentially verti ⁇ cally, whereby the narrower flange will be situated essentially horizontally.
  • the weld seams are made to the sides of the wider flange of the L-section that rests against the underside of the top plate as is particularly shown in Fig. 2.
  • a preferred embodiment of the invention is shown therein having the stiffeners comprised by steel sections 3 formed into an essentially trough- shaped section with two side flanges 4 and a lower web 5.
  • the shaped steel sections which are attached at the upper edges of the side flanges 4 to the underside of the hatch cover top plate 1, together with the top plate form a closed box section structure.
  • the angles of the side flanges with respect to the underside of the hatch cover top plate are arranged such that advantageously the side flanges 4 are convergent with each other toward the apex of the section pointing downward away from the underside of the hatch cover top plate 1.
  • the angle of the side flange to the top plate can be made, e.g., not smaller than 30° and not larger than 90°. Also other angles are possible while not particularly practical due to greater tendency of other angles to gather dirt, which is just the opposite of the goal of the invention. While advantageously equal, the angles of the side flanges to the top plate underside need not necessarily be equal, but instead, the angles can be made unequal at, e.g., 80° and 60°. Such slanted side flanges 4 give an additional benefit therein that the weld seam is easy to make between the edge of the side flange 4 and the top plate underside as a suitable wedge-shaped groove is thus advantageously formed between these elements (Fig. 4).
  • the side flanges 4 are bridged by an essentially planar lower web 5 which is aligned essentially parallel with respect to the underside of the hatch cover top plate.
  • this web is omitted al- lowing the side flanges to join essentially perpendicular ⁇ ly, whereby a V-section is formed.
  • the apex angle of the V is in the range 60-120°, advantageously approx. 90°.
  • the maximum height oL the t>Leel section according to the invention is in the range 100-300 mm, whereby the maximum width of the section is in the range 300-600 mm and the material thickness is advantageously in the range 4-6 mm.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

Cette invention a trait à une structure de renfort destinée à la plaque supérieure (1) d'un couvercle d'écoutille utilisé à bord d'un navire de charge. Cette structure comporte un, voire plusieurs, profilé (s) plié (s) en acier de forme allongée, monté (s) en parallèle et rattaché (s) sur toute la longueur à la face inférieure de la plaque susmentionnée. Les profilés pliés en acier selon l'invention sont fixés par leurs deux cotés longitudinaux à la face inférieure de la plaque supérieure (1) du couvercle d'écoutille, le profilé (3) et la plaque supérieure (1) du couvercle d'écoutille constituant ensemble un caisson quasiment fermé.
PCT/FI1996/000276 1996-05-17 1996-05-17 Structure de renfort pour couvercle d'ecoutille de navire de charge WO1997044235A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/FI1996/000276 WO1997044235A1 (fr) 1996-05-17 1996-05-17 Structure de renfort pour couvercle d'ecoutille de navire de charge
AU57656/96A AU5765696A (en) 1996-05-17 1996-05-17 Reinforcement construction for a hatch cover of a cargo ship

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI1996/000276 WO1997044235A1 (fr) 1996-05-17 1996-05-17 Structure de renfort pour couvercle d'ecoutille de navire de charge

Publications (1)

Publication Number Publication Date
WO1997044235A1 true WO1997044235A1 (fr) 1997-11-27

Family

ID=8556647

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1996/000276 WO1997044235A1 (fr) 1996-05-17 1996-05-17 Structure de renfort pour couvercle d'ecoutille de navire de charge

Country Status (2)

Country Link
AU (1) AU5765696A (fr)
WO (1) WO1997044235A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2353068A (en) * 1942-04-18 1944-07-04 Gen Bronze Corp Metallic flooring
US2945328A (en) * 1954-03-02 1960-07-19 Websteel Framing Systems Inc Floor joist and assembly
DE2200974A1 (de) * 1971-03-24 1972-09-28 Robertson Co H H Wellblech-Abdeckabschnitt
EP0102120A2 (fr) * 1982-08-23 1984-03-07 Beheermaatschappij H.D. Groeneveld B.V. Plancher pour l'utilisation dans la technique marine et la construction navale
US4461232A (en) * 1981-07-10 1984-07-24 Proform, Inc. Lightweight marine barge cover

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2353068A (en) * 1942-04-18 1944-07-04 Gen Bronze Corp Metallic flooring
US2945328A (en) * 1954-03-02 1960-07-19 Websteel Framing Systems Inc Floor joist and assembly
DE2200974A1 (de) * 1971-03-24 1972-09-28 Robertson Co H H Wellblech-Abdeckabschnitt
US4461232A (en) * 1981-07-10 1984-07-24 Proform, Inc. Lightweight marine barge cover
EP0102120A2 (fr) * 1982-08-23 1984-03-07 Beheermaatschappij H.D. Groeneveld B.V. Plancher pour l'utilisation dans la technique marine et la construction navale

Also Published As

Publication number Publication date
AU5765696A (en) 1997-12-09

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