EP2698483A1 - Verbessertes, leichtes, hochfestes Sektionalelement, insbesondere für trittfeste Gitter - Google Patents

Verbessertes, leichtes, hochfestes Sektionalelement, insbesondere für trittfeste Gitter Download PDF

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Publication number
EP2698483A1
EP2698483A1 EP13178080.1A EP13178080A EP2698483A1 EP 2698483 A1 EP2698483 A1 EP 2698483A1 EP 13178080 A EP13178080 A EP 13178080A EP 2698483 A1 EP2698483 A1 EP 2698483A1
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EP
European Patent Office
Prior art keywords
sectional element
sectional
load
bars
bearing
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.)
Granted
Application number
EP13178080.1A
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English (en)
French (fr)
Other versions
EP2698483B1 (de
Inventor
Sandro Leonardi
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.)
Italiana Keller Grigiati Soc Coop A Rl
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Italiana Keller Grigiati Soc Coop A Rl
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Filing date
Publication date
Application filed by Italiana Keller Grigiati Soc Coop A Rl filed Critical Italiana Keller Grigiati Soc Coop A Rl
Priority to PL13178080T priority Critical patent/PL2698483T3/pl
Publication of EP2698483A1 publication Critical patent/EP2698483A1/de
Application granted granted Critical
Publication of EP2698483B1 publication Critical patent/EP2698483B1/de
Priority to HRP20171498TT priority patent/HRP20171498T1/hr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/42—Gratings; Grid-like panels
    • E04C2/421—Gratings; Grid-like panels made of bar-like elements, e.g. bars discontinuous in one direction
    • E04C2/422—Gratings; Grid-like panels made of bar-like elements, e.g. bars discontinuous in one direction with continuous bars connecting at crossing points of the grid pattern
    • E04C2/423—Gratings; Grid-like panels made of bar-like elements, e.g. bars discontinuous in one direction with continuous bars connecting at crossing points of the grid pattern with notches

Definitions

  • the present invention relates to the sector of treadable metal surfaces, permeable to air and light, normally referred to as "gratings".
  • the weight of the plates of gratings to be laid and the servo structures are the main aspects that are demanding both from the commercial standpoint (for quantifying the costs in the supply stage) and from the technical standpoint (in the stage of drafting of the detailed design).
  • the prior art basically envisages creating a lattice structure where the flat-bar and round-bar elements form a node at each intersection thereof.
  • an electrode On each node (point of connection between load-bearing bars and transverse bars) an electrode is dropped into place, exerting a contact pressure. The subsequent passage of electric current develops heat, causing localized melting of the contact components.
  • the metal sectional element according to the invention is characterized by a cross section presenting one or more bends and/or counter-bends at the ends in order to obtain advantageously a high moment of inertia to bending as compared to other metal sectional elements with cross sections of equal area, which renders it suited to being used as load-bearing bar of a new type of grating product that overcomes the limits of the small spans of the traditional grating and at the same time presents characteristics of lightness (and hence lower costs) that are markedly desirable both from the point of view of the designer and from the point of view of the customer in drafting of the designs.
  • the solution proposed by the present invention takes the form of creating grating panels with an electro-forging process, recalling that joining of the load-bearing bars to the transverse bars is obtained by the combined action of electro-welding - without use of weld material - and pressure, concentrated on all the nodes.
  • the section of the sectional element is not penalized in so far as no vertical incisions or openings are made and there is no removal of material that might jeopardize the quality in terms of static characteristics and hence load-bearing characteristics, as instead occurs in certain known implementations adopted in the prior art.
  • the sectional element according to the invention stems from the requirement of getting away from traditional commercial flat steel bars with rectangular cross section obtained by rolling or from coils using a hot process in order to provide a product that - given the same cross section - has a far higher moment of inertia and hence a greater bending-load capacity.
  • the new sectional element thus constituted is able to combine the static requirements and the requirements of lightness.
  • the inertia possessed by the new sectional element which is, for example, 120 mm deep and 2 mm thick, is practically equivalent to that of the sectional element constituted by a flat bar 120 mm deep and 6 mm thick, with the difference that the new sectional element presents an area, and hence a weight, that is approximately 37% less.
  • the inertia possessed by the new sectional element 120 mm deep is 75% greater than that of the sectional element constituted by a flat bar 80 mm deep and 5 mm thick.
  • a first embodiment of the sectional element P envisages a cross section presenting a basically rectilinear and thin central part 2, with the ends bent back 1 on themselves one or more times.
  • the bending load that can be withstood by the sectional element itself increases.
  • a variant of the invention envisages a plurality of through holes 3, preferably slotted holes, arranged precisely in the areas of the free ends, of maximum curvature.
  • these holes 3 arranged facing outwards, i.e., towards the treading surface, ensure a valid anti-slip function.
  • the sectional element P according to the invention is designed to be used as load-bearing element or bar for the production of treadable gratings G by joining it to transverse bars T, made up of round bars or twisted square bars, by application of pressure and by electro-welding of all the points of contact between the load-bearing sectional elements P and the transverse bars T.
  • Figures 8 , 10 and 9 , 11 regard, respectively, a slotted anti-slip sectional element P with single and double end bends, as well as the gratings G obtained with said sectional elements.
  • a second embodiment of the invention illustrated in Figures 12 to 17 in different variants, regard the anti-vertigo version of the load-bearing sectional element, designated by the reference P1.
  • the central part of the cross section of the sectional element P1 is shaped so as to have a bend 5, which is preferably (but not exclusively) V-shaped and projects laterally.
  • This projecting bend 5 is designed to limit or eliminate the possibility of seeing through the grating G obtained with these sectional elements ( Figures 16-17 ).
  • the union between the load-bearing bars P or P1 and the transverse bars TP is obtained by means of pressure exerted on the transverse bars themselves to constrain them in slots purposely provided on the load-bearing bars P or P1.
  • the second embodiment of the invention described above in addition to having the anti-vertigo function, also provides a greater resistance to lateral bending: the presence of the lateral bend, in fact, increases the moment of inertia of the cross section in the lateral direction (horizontal as viewed in the figures).
  • a third embodiment of the invention regards a sectional element (P' or P1') that derives substantially from division - along the horizontal axis - of the profile according to the first embodiment (P) or second embodiment (P1) of the invention, or of their variants.
  • the cross section of the sectional element P' or P1' in this third embodiment has one end with one or more bends 1, while the other end terminates without any bend but just with a possible lateral inclination.
  • This third embodiment is hence constituted by a sectional element P' or P1' that is shallower than the previous ones but presents static characteristics and characteristics of lightness that are in any case superior to the bars that normally constitute customarily produced gratings designed for the loading conditions of the lowest classes (i.e., Classes 1 and 2).
  • this third embodiment of the sectional element according to the invention has a cross section that on one side presents one or more bends 1, with or without the slots 3 already described that have the draining and anti-slip functions, whereas on the other side 2' there are no bends, but there is possibly present just a lateral inclination of the body of the sectional element, where said inclination may be single or else double 5' - in two directions opposite to one another - to achieve an anti-vertigo function.
  • this latter sectional element may be evidently provided with slots 3 with anti-slip and draining functions.
  • this third embodiment of the invention is hence intended to create a grating understood as covering mainly the needs for laying Class-1 horizontal stretches (pedestrian load of 600 daN/m 2 ) without necessarily having to use the sectional elements of the previous cases characterized by a deeper section, maintaining, however, the same aesthetic, surface, anti-slip, and draining characteristics thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Floor Finish (AREA)
  • Tires In General (AREA)
  • Sewage (AREA)
  • Baking, Grill, Roasting (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
EP13178080.1A 2012-08-13 2013-07-25 Verbessertes, leichtes, hochfestes Sektionalelement, insbesondere für trittfeste Gitter Active EP2698483B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL13178080T PL2698483T3 (pl) 2012-08-13 2013-07-25 Udoskonalony lekki, wytrzymały element segmentowy, w szczególności do krat pomostowych
HRP20171498TT HRP20171498T1 (hr) 2012-08-13 2017-10-05 Poboljšani lagani profilni element velike čvrstoće, naročito za rebrasta gazišta

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000409A ITRM20120409A1 (it) 2012-08-13 2012-08-13 Profilato perfezionato ad alta resistenza meccanica e peso ridotto, in particolare per grigliati calpestabili.

Publications (2)

Publication Number Publication Date
EP2698483A1 true EP2698483A1 (de) 2014-02-19
EP2698483B1 EP2698483B1 (de) 2017-07-12

Family

ID=47046751

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13178080.1A Active EP2698483B1 (de) 2012-08-13 2013-07-25 Verbessertes, leichtes, hochfestes Sektionalelement, insbesondere für trittfeste Gitter

Country Status (5)

Country Link
EP (1) EP2698483B1 (de)
ES (1) ES2640575T3 (de)
HR (1) HRP20171498T1 (de)
IT (1) ITRM20120409A1 (de)
PL (1) PL2698483T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3106584A1 (de) * 2015-06-19 2016-12-21 Italiana Keller Grigiati Soc. Coop. a R.L. Verbesserte stufe für trittfestes gitter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479777A (en) * 1968-03-22 1969-11-25 Concrete Conduit Co Inc Underground utility vault with a ventilator-type grate
FR2369499A1 (fr) * 1976-10-26 1978-05-26 Caillebotis Metalliques Ste Gl Procede de fabri
EP0396136A1 (de) * 1989-05-05 1990-11-07 Rheinhold & Mahla AG Platte für Doppelböden
DE29610417U1 (de) * 1996-06-14 1996-09-26 Buerkner Lutz Gitterrost
WO2009029988A1 (en) * 2007-09-04 2009-03-12 Unitload Pty Ltd Steel strips with folded edges to form load bearing structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479777A (en) * 1968-03-22 1969-11-25 Concrete Conduit Co Inc Underground utility vault with a ventilator-type grate
FR2369499A1 (fr) * 1976-10-26 1978-05-26 Caillebotis Metalliques Ste Gl Procede de fabri
EP0396136A1 (de) * 1989-05-05 1990-11-07 Rheinhold & Mahla AG Platte für Doppelböden
DE29610417U1 (de) * 1996-06-14 1996-09-26 Buerkner Lutz Gitterrost
WO2009029988A1 (en) * 2007-09-04 2009-03-12 Unitload Pty Ltd Steel strips with folded edges to form load bearing structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3106584A1 (de) * 2015-06-19 2016-12-21 Italiana Keller Grigiati Soc. Coop. a R.L. Verbesserte stufe für trittfestes gitter

Also Published As

Publication number Publication date
PL2698483T3 (pl) 2017-12-29
EP2698483B1 (de) 2017-07-12
HRP20171498T1 (hr) 2017-11-17
ITRM20120409A1 (it) 2014-02-14
ES2640575T3 (es) 2017-11-03

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