WO2013093206A1 - Conteneur de transport et son plancher - Google Patents

Conteneur de transport et son plancher Download PDF

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Publication number
WO2013093206A1
WO2013093206A1 PCT/FI2012/051284 FI2012051284W WO2013093206A1 WO 2013093206 A1 WO2013093206 A1 WO 2013093206A1 FI 2012051284 W FI2012051284 W FI 2012051284W WO 2013093206 A1 WO2013093206 A1 WO 2013093206A1
Authority
WO
WIPO (PCT)
Prior art keywords
floor structure
surface layer
floor
beams
martensitic
Prior art date
Application number
PCT/FI2012/051284
Other languages
English (en)
Inventor
Ilpo Maaranen
Jukka SILTANEN
Ville-Matti NURMELA
Original Assignee
Rautaruukki Oyj
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 Rautaruukki Oyj filed Critical Rautaruukki Oyj
Priority to EP12858888.6A priority Critical patent/EP2794428A4/fr
Publication of WO2013093206A1 publication Critical patent/WO2013093206A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/02—Large containers rigid
    • B65D88/12—Large containers rigid specially adapted for transport
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/02—Wall construction
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor

Definitions

  • the present invention relates to a floor structure for transport container and more particularly to a floor structure according to the preamble of claim 1 .
  • the present invention further relates to a transport container and more particularly to a transport container according the preamble of claim 18.
  • Transport containers and so called general transport containers or dry transport containers, are used for transporting different kinds of cargo.
  • the transport containers conventionally comprise a support frame and floor structure, wall structure and roof structure attached and supported to the support frame.
  • the floor structure usually comprises separate support beams attached to the support frame and such that they extend in the transversal direction in relation to the longitudinal direction of the floor structure.
  • the support frame is usually provided from tubular elements and the support beams from I-beams or the like.
  • a floor surface is provided by one or more thick plywood boards installed on the support beams. The plywood boards are thick enough such that they stiffen the floor structure and carry the load caused by operations performed on it. From the underside the floor structure is typically open such that the support beams are exposed.
  • An object of the present invention is therefore to provide a floor structure for a transport container and a transport container so as to solve or at least alleviate the above mentioned problems.
  • the objects of the present in- vention are achieved by a floor structure for a container which is characterized in that the first surface layer is formed from hardened martensitic steel sheet, as defined the characterizing portion of claim 1 .
  • the objects of the present invention are further achieved by a transport container provided with a floor structure comprising a first surface layer formed from hardened martensitic steel sheet, as defined in the characterising portion of claim 18.
  • the invention is based on the idea of omitting the plywood boards and using a hardened martensitic steel sheet for forming the floor surface of the floor structure of the transport container.
  • the martensitic steel sheet may be hardened by conventional post hardening method in which the steel is first heated in a hardening oven to hardening temperature and then rapidly cooled down, ie. quenched for hardening the steel.
  • the martensitic steel sheet may also be direct hardened steel, i.e. direct quenched steel, meaning that the steel is hardened directly in the hot-rolling production process immediately after the final hot-rolling pass and before the steel strip is coiled.
  • An advantage of the present invention is that when the first surface layer of containers floor structure is formed from hardened martensitic steel sheet, the floor structure of the container has very good stiffness and good im- pact resistance characteristics together with excellent abrasion resistance. Due to the above mentioned viewpoints the required maintenance of the work of the containers is decreased as there is no need for regularly replacing the hardened steel sheet. Additionally the steel is fully recyclable material and produces no hazardous waste material after use.
  • the hardened martensitic steel sheet may be less than 6 mm thick for reaching the required stiffness and impact strength of the floor structure of the transportation container. Furthermore, this kind of steel sheet or plate combined with the floor structure according to the present invention provides a very light weight and flat base for the container.
  • the present invention may provide increased cargo space which has considerably transportation and cost advantages.
  • the considerable effect of the present invention is that the above mentioned advantages are achieved without substantially increasing the weight of the container and the floor structure thereof due to the decreased thickness.
  • Figure 1 is shows schematically a transport container
  • Figures 2A and 2B show schematically the structure of the transport container of figure 1 ;
  • Figures 3A and 3B show schematically one embodiment of the floor structure of the present invention
  • Figure 4 shows schematically an alternative embodiment of the floor structure of the present invention.
  • Figure 5 shows schematically yet another alternative embodiment of the floor structure of the present invention.
  • Figure 1 is shows schematically a general transport container 1 for transporting dry cargo.
  • the transport container 1 is substantially rectangular and comprises a wall structure 6, roof structure 4 and floor structure 2.
  • the container 1 further comprises a support frame 5 to which the wall, roof and floor structures are supported.
  • the container 1 is further provided with a loading door (not shown) at the shorter vertical side, i.e. at the end of the container.
  • the wall and roof structures 6, 4 are usually formed from profiled sheets of steel, which may be coated with zinc and/or paint or some other coating material.
  • Figure 2A shows the transport container 1 from one end thereof.
  • the support frame 5 forms a substantially rectangular cargo space together with the roof, wall and floor structures 4, 6, 2.
  • the floor structure 2 comprises a first surface layer 8 forming the floor surface of the cargo space of the container 1 .
  • Figure 2B shows the floor structure 2 of the transport container 1 from above.
  • the floor structure 2 comprises a first surface layer 8 forming a floor surface and a support arrangement for supporting the first sur- face layer 8.
  • the support arrangement comprises the elements arranged to support the first surface layer 8.
  • the support arrangement comprises a floor frame 7, 3 which may be part of the support frame 5 of the transport container 1 .
  • the support arrangement further comprises separate beams 10, provided on the underside of the first surface layer 8 and shown with dotted lines figure 2B.
  • the separate beams 10 may be attached to the underside of the first surface layer (8) adjacent and/ or in parallel direction to each other.
  • the beams 10, are attached to the floor frame 3 from their ends and further to the first surface layer 8.
  • the floor frame 7 surrounds the beams 10 in lateral direction.
  • the floor frame 3, 7 may be formed from tubular elements which are joined togeth- er by connection pieces 9.
  • the load-bearing floor frame 3, 7 may be formed from profile beams such as, U-beam or the like.
  • Profile beam means a beam that is produced by profiling the shape of the beam, i.e. not produced by welding.
  • the floor frame 3, 7 may also be formed from I-beams or other welded beams.
  • the wall structure 6 may be supported to the upper surface of the floor frame 3, 7.
  • Figure 3A shows one embodiment of the present invention in which the floor structure 2 comprises a first surface layer 8, separate profile beams 10 and a second surface layer 21 .
  • the floor structure 2 forms honeycomb structure in which the support arrangement or the profile beams 10 forms the core elements of the honeycomb between the first and second surface layers 8, 21 .
  • first surface sheet formed from thin hardened martensitic steel sheet is a flat, light-weight and very rigid structure for the base of the transportation container 1 .
  • the first surface layer 8 forms the floor surface of the cargo space and the second surface layer 21 forms the bottom surface of the floor structure.
  • the profile beams 10 are attached to the first and second surface layer 8, 21 by welding, laser welding or mechanically or by fusion.
  • the separate profile beams 10 are delta-beams having a ridge section 16, web section 18 and flange sections 20.
  • the ridge section 16 is attached by laser welds 13 to the second surface layer 21 and the flange sections 20 are attached to the first surface layer 8 by laser welds 12.
  • the profile beams have Z-, U- or V-profile or some other profile.
  • the profile beams 10 mean beams which are produced by profiling, forming or bending steel material, such as steel sheet or steel plate into a form of beams. Thus the profile beams 10 are beams 10 which are not produced by welding separate parts together.
  • the profile beams 10 are manufactured from steel thin sheet, and specifically they may be manufactured from high strength steel that may be galvanized or weathering steel.
  • the profile beams 10, 24 may have material thickness in the range 0,5 to 3 mm, preferably in the range 1 to 2 mm.
  • High strength steel means that steel includes yield strength more than 400MPa, more preferably more than 500MPa.
  • the first surface layer 8 is formed from hardened martensitic steel sheet.
  • the first surface layer 8 may be manu- factured from post hardened martensitic steel or from direct hardened martensitic steel.
  • the post hardening may have some drawback relating to produce a thin enough steel sheet having excellent flatness.
  • the steel sheet provided by post hardening may not provide fully straight and thin floor 2 surface. Therefore the martensitic steel sheet of the first surface layer 8 is preferably direct hardened for providing a thin and smooth floor surface with excellent impact strength.
  • the post hardening furthermore may enable only limited size sheets to be hardened due to the limited size of the hardening oven.
  • the floor may have to be formed from several separate post hardened steel sheets, especially in the longitudinal direction of the container.
  • the microstructure of the steel sheet that is formed from hardened martensitic comprises, in terms of volume percentages, at least 70% martensitic phases, preferably at least 80% martensitic phases and more preferably at least 90% martensitic phases.
  • the residual main phases may include ferrite, perlite, residual austenite and/or bainite, for instance.
  • first surface layer 8 may be made from fully martensitic steel or martensitic-bainitic steel. Therefore it should be understood that the term martensitic includes also martensitic-bainitic steel.
  • a tempering heat-treatment is per- formed for martensitic steel after hardening and also before forming the floor structure 2.
  • steel sheet is hardened and tempered and thereby including tempering-martensitic microstructure. Therefore it should be understood that the term martensitic includes also tempering-martensitic steel.
  • the hardness of the martensitic steel in first surface layer 8 is at least 270 HBW, preferably at least 360 HBW and most preferably at least 420 HBW.
  • the hardness is measured in Brinell units (HBW) in compliance with EN ISO 6506-1 on a milled surface 0.3-2 mm below sheet surface.
  • First surface layer 8 made of martensitic steel may also include yield strength at least 900MPa which provides excellent resistant against plastical failures for example locally in the surface sheet between the beams.
  • the first surface sheet 8 made from hardened martensitic steel sheet is covering the whole floor 2 of the container structure 1 .
  • the thickness of the first surface layer 8 may be less than 6 mm or less than 5 mm, or even in the range 1 to 4 mm such as in the range 1 ,5 to 3 mm. Even low thickness of martensitic steel sheet can contribute in achieving the necessary stiffness and impact strength for the floor structure 2.
  • the first surface layer 8 may be formed from steel plates or alternatively and even more preferably from steel strip. Therefore said steel sheet can be also considered as steel plate or cut to length steel strip.
  • the floor structure 2 may further comprise a second surface layer 21 for closing the floor structure 2 and providing the honeycomb structure.
  • the second surface layer 21 may be formed from weathering steel sheet or hardened weathering steel sheet.
  • the thickness of the second surface layer 21 may be less than 6 mm, or less than 5 mm preferably in the range 1 to 4 mm, most preferably in the range 1 ,5 to 3 mm.
  • Figure 3B shows an alternative embodiment in which a further top surface layer 14 is arranged on the first surface layer 8 for forming the top floor surface.
  • This top surface layer 14 is for example provided by a thin plywood board or some other corresponding material.
  • FIG 4 shows yet an alternative embodiment of the present invention in which there is no second surface layer 21 and the bottom structure 2 is open from the underside.
  • the support beams 1 1 are formed from I-beams 1 1 having a first flange 17, web 15 and second flange 19.
  • the I-beams 1 1 are attached to the first surface layer 8 by welds 23.
  • the I-beams 1 1 may be replaced by other beams 10, 24 such as U-beams or the like and they may be attached also by laser welds, mechanically or by fusion to the first surface layer 8.
  • the beams 1 1 may be manufactured from high strength steel that may be galvanized or weathering steel. Additionally the beams 1 1 may be coated with paint. High strength steel means that steel includes yield strength more than 400MPa, more preferably more than 500MPa and even more than 700MPa.
  • the profile beams 10 made of high strength steel are attached, by welding for instance, only to the first sur- face layer 8 made of hardened martensitic steel sheet and there is no second surface layer 21 whereby the floor structure 2 is open from the underside.
  • the separate profile beams 10 are delta-beams having a ridge section 16, web section 18 and flange sections 20.
  • the flange sections 20 are attached to the first surface layer 8 and the ridge sections are forming the bearing surface to be against the ground during use of the container.
  • Figure 5 shows an alternative embodiment of the present invention in which the floor structure comprises a first surface layer 8 and separate profile beams 24.
  • the first surface layer 8 forms the floor surface of the cargo space and the floor structure 2 is open from the under underside such that the support arrangement, or the profile beams 24 are exposed and may be subjected to environmental conditions.
  • the profile beams 24 are attached to the first layer by welding, and especially with fillet or corner welds 27, as shown in figure 5. Corner or fillet welds 27 may be formed by laser welding, for instance.
  • the separate profile beams 24 are V-beams having a ridge section 25 and web sections 26. The web sections 26 are attached with the corner welds 27 to the first surface layer 8 and the ridge sections 25 are forming the bearing surface to be against the ground during use of the container.
  • the profile beams 24 may be manufactured from steel thin sheet, and specifically they may be manufactured from high strength steel that may be galvanized or weathering steel.
  • the profile beams 24 may have material thickness in the range 0,5 to 3 mm, preferably in the range 1 to 2 mm.
  • High strength steel means that steel includes yield strength more than 400MPa, more preferably more than 500MPa.
  • the floor structure 2 may also comprise one or more separate second surface layers 21 for forming one or more separate honeycomb sections to the floor structure 2. This means that the floor structure 2 does not have to be closed but it may be only partially closed. In other words, bottom structure may be completely or partially open from the underside.
  • the floor structure 2 may be divided to two sections, the first section comprises a gooseneck for connecting to a transport ve- hide and has a structure open from the underside as shown for example in figure 4, and the second section has a structure closed form the underside as shown for example in figures 3A or 3B.
  • the first surface layer 8 may be continuous over the both first and second sections.
  • the first surface layer 8 may be a low honeycomb element in which the upper sheet is the hardened martensitic steel sheet as discussed above.
  • the height of the honeycomb element may be for example 10 to 30 mm.
  • the hardened martensitic steel sheet may be provided on top of an existing plywood board for forming a steel surface for the cargo space.
  • the present invention also provides use of hardened martensitic or martensitic-bainitic steel sheet for forming the floor 2 of a transport container 1 , or use of direct hardened martensitic or martensitic-bainitic steel sheet for forming the floor 2 of a transport container 1 . This provides the technical benefits discussed above.

Abstract

La présente invention porte sur une structure de plancher (2) pour un conteneur de transport (1) et sur un conteneur de transport. La structure de plancher (2) comprend une première couche de surface (8) formant une surface de plancher et un agencement de support (10, 11, 24) pour supporter la première couche de surface (8). L'invention est basée sur l'idée d'omettre les plaques de contreplaqué et d'utiliser une tôle d'acier martensitique durcie pour former la surface de plancher de la structure de plancher (2) du conteneur de transport (1). Selon la présente invention, la première couche de surface (8) est formée à partir d'une tôle d'acier martensitique durcie. Un avantage de la présente invention est que, quand la structure de plancher (2) du conteneur est formée à partir d'une tôle d'acier martensitique durcie, la structure de plancher (2) du conteneur a une très bonne rigidité et de bonnes caractéristiques de résistance à l'impact, avec une excellente résistance à l'abrasion.
PCT/FI2012/051284 2011-12-23 2012-12-20 Conteneur de transport et son plancher WO2013093206A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12858888.6A EP2794428A4 (fr) 2011-12-23 2012-12-20 Conteneur de transport et son plancher

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20116324A FI20116324A (fi) 2011-12-23 2011-12-23 Kuljetuskontti ja sen lattia
FI20116324 2011-12-23

Publications (1)

Publication Number Publication Date
WO2013093206A1 true WO2013093206A1 (fr) 2013-06-27

Family

ID=48632130

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2012/051284 WO2013093206A1 (fr) 2011-12-23 2012-12-20 Conteneur de transport et son plancher

Country Status (4)

Country Link
EP (1) EP2794428A4 (fr)
CN (1) CN103171835A (fr)
FI (1) FI20116324A (fr)
WO (1) WO2013093206A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020201365A1 (fr) * 2019-04-03 2020-10-08 Maersk Container Industry A/S Plancher pour récipient, récipient comprenant une partie de plancher, partie de plancher et procédé de fabrication d'une section de plancher

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2086747A (en) * 1931-06-08 1937-07-13 Charles C Stetson Shipping container
GB1236698A (en) * 1969-06-12 1971-06-23 Uddeholms Ab Stainless martensitic steels
CN2496815Y (zh) * 2001-07-25 2002-06-26 中国国际海运集装箱(集团)股份有限公司 集装箱的底架结构
WO2004071901A1 (fr) * 2003-02-11 2004-08-26 Veli-Pekka Immonen Conteneur de transport
FI6864U1 (fi) * 2005-08-26 2005-11-17 Kenno Tech Oy Ajoneuvon tai perävaunun itsekantava pohjalaatta

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4033706A1 (de) * 1990-10-24 1991-02-21 Hans Prof Dr Ing Berns Einsatzhaerten mit stickstoff zur verbesserung des korrosionswiderstandes martensitischer nichtrostender staehle
CN2557484Y (zh) * 2002-04-30 2003-06-25 中国国际海运集装箱(集团)股份有限公司 一种集装箱底架结构
CN201183656Y (zh) * 2008-03-07 2009-01-21 广东顺安达太平货柜有限公司 一种集装箱底架结构
CN202967195U (zh) * 2012-03-29 2013-06-05 罗奇钢铁公司 运输集装箱及其底部结构

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2086747A (en) * 1931-06-08 1937-07-13 Charles C Stetson Shipping container
GB1236698A (en) * 1969-06-12 1971-06-23 Uddeholms Ab Stainless martensitic steels
CN2496815Y (zh) * 2001-07-25 2002-06-26 中国国际海运集装箱(集团)股份有限公司 集装箱的底架结构
WO2004071901A1 (fr) * 2003-02-11 2004-08-26 Veli-Pekka Immonen Conteneur de transport
FI6864U1 (fi) * 2005-08-26 2005-11-17 Kenno Tech Oy Ajoneuvon tai perävaunun itsekantava pohjalaatta

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2794428A4 *

Also Published As

Publication number Publication date
EP2794428A4 (fr) 2015-09-09
CN103171835A (zh) 2013-06-26
EP2794428A1 (fr) 2014-10-29
FI20116324A (fi) 2013-06-24

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