EP3516128A1 - Elément de construction allongé creux - Google Patents
Elément de construction allongé creuxInfo
- Publication number
- EP3516128A1 EP3516128A1 EP17768472.7A EP17768472A EP3516128A1 EP 3516128 A1 EP3516128 A1 EP 3516128A1 EP 17768472 A EP17768472 A EP 17768472A EP 3516128 A1 EP3516128 A1 EP 3516128A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- peripheral structure
- construction element
- element according
- section
- polygonal peripheral
- 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
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 15
- 239000002131 composite material Substances 0.000 claims abstract description 14
- 238000010276 construction Methods 0.000 claims description 31
- 241000446313 Lamella Species 0.000 claims description 14
- 238000005520 cutting process Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 7
- 239000002023 wood Substances 0.000 abstract description 21
- 239000011800 void material Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
- E04C3/127—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with hollow cross section
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
- E04C3/122—Laminated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B1/00—Methods for subdividing trunks or logs essentially involving sawing
- B27B1/005—Methods for subdividing trunks or logs essentially involving sawing including the step of dividing the log into sector-shaped segments
Definitions
- the present invention relates to a composite elongated hollow structural member optimized in mechanical strength.
- Construction companies and architects are responding to this demand by using building materials for renewable and insulating materials such as wood, which they tend to use as cheaply as possible.
- Solid composite wood construction elements have already been improved in terms of mechanical strength.
- GB 781, 627 discloses a composite wood beam composed of pairs of longitudinal lamella triangular or trapezoidal cross section juxtaposed and inverted, the slats having been obtained by radial cutting in logs.
- the strength of the beam is improved by providing in its most stressed zones bending, that is to say upper and lower, wood obtained at the periphery of the logs. This wood, which is younger and has a greater ring density, is more resistant.
- EP 1277552 B1 relates to a method of manufacturing composite beams composed of longitudinal lamella pairs with only trapezoidal section juxtaposed and inverted.
- US Patent 5816015 also relates to a method of manufacturing composite beams which is limited to lamellae of triangular section.
- the international application WO2016020848 relates to construction elements more generally such as beam, column, column or slab.
- the solid wood construction elements of the aforementioned documents have the disadvantage that they are relatively heavy.
- EP0069121, WO8002709, WO9517565 and NL1017360 refer to hollow elongated building elements, such as poles, piles or sleepers, which have a polygonal or circular cross section.
- NL8004909 it relates to a construction element of comparable appearance which, in particular, is able to maintain its rectilinear shape and can therefore find application in the construction sector. If these elements as represented seem to have acceptable rigidity, their mechanical strength can be improved.
- an object of the invention is to provide an elongated composite wood construction element that is optimized in terms of its mechanical characteristics in order to achieve high performance and functional constructions.
- Another object of the invention is to provide an economic building element within the framework of sustainable development.
- the construction element of the invention is made of composite wood and is hollow. It has a polygonal peripheral structure around the hollow. Each side of this polygonal peripheral structure is formed of at least one pair of elongate slats with triangular or trapezoidal cross section juxtaposed and inverted relative to each other.
- the polygonal peripheral structure further has slat-shaped abutting means in its corner regions. The different slats, which were obtained by radial cutting in logs, are glued to each other.
- a hollow element saves material in its central zone (close to the neutral axis), where it does not contribute or only slightly to the rigidity, which is determined by the moment of quadratic moment of inertia influenced by the geometry of the cross-section, and thus to the strength of the beam.
- a hollow element is obviously lighter, which saves transportation and handling costs. It therefore has a smaller ecological footprint.
- a hollow construction element allows to pass utility ducts such as cables and electrical son or pipes inside the element, which reduces the size of these utility ducts and also allows to hide them.
- the material is pushed back to the periphery of the beam, where it is more mechanically efficient because the beam is the most requested in flexion.
- This material is also particularly resistant because of its particular structure comprising elongate slats with triangular or trapezoidal cross section juxtaposed and inverted with respect to each other. These slats resulting from radial cuts in logs are mechanically very strong because of their higher density of denser and therefore more resistant young wood located at the base (in the case of a triangular section) or the large base (in the case of a trapezoidal section).
- the rings are oriented uniformly with respect to the cutting planes, so that the wood thus obtained has a lower variability or standard deviation in terms of its mechanical characteristics (under certain conditions of classification / purging imposed) than that obtained by conventional rectangular cuts. Consequently, a lesser security can be adopted when defining the resistance values to be used for sizing the corresponding building elements. This will result in higher strength values, which will save raw material.
- the resistance values of the European standard EN 338 which gives the characteristic values of wood according to gasoline, can be increased by around 15 to 20%.
- the slats obtained by radial cuts are less prone to warping due to the removal of the wood during drying, which reduces subsequent planing of the wood.
- the radial cutting of logs leads to less waste and is therefore more economical.
- the construction element of the invention is therefore optimized both in terms of the geometry of the cross section (hollow) and resistance of the composite wood to make it both very strong and lightweight.
- the construction element according to the invention is configured as a beam or column.
- the construction element according to the invention has a constant cross section along its entire length.
- the polygonal peripheral structure of the construction element according to the invention is quadrilateral.
- it is rectangular. Rectangular geometry allows easier implementation.
- the abutting means of the construction element according to the invention are lamellae with triangular or trapezoidal cross-section and comprise in each corner zone a central elongated lamella and at least one elongated lamella forming stop located on either side of the central strip.
- the cross sections of the central lamella and those of the lamellae forming a stop are oriented so as to produce a cone effect. This arrangement makes it possible to induce, by the cone effect in the corner zones, a strong clamping of the different lamellae during their bonding and consequently to increase the mechanical strength of the construction element.
- the central lamella and the lamella forming a stop are of trapezoidal cross-section.
- the large base of the central lamella and the small base of the lamellae forming a stop are turned towards the hollow of the construction element.
- FIG. 1 is a perspective view of a building element of the invention in the form of a beam of rectangular cross-section;
- FIG. 2 illustrates the resistance of wood to shrinkage during drying according to its method of sampling within a log.
- Fig. 1 shows a hollow composite wooden building element 1 configured as a rectangular cross section beam constant along its length.
- the beam 1 further has a rectangular peripheral structure 3 around the hollow.
- the structure 3 as illustrated is formed of five elongated lamellae 5 (ie 2.5 pairs) with trapezoidal cross section juxtaposed, inverted and glued for the length of the peripheral structure, and 3 lamellae 5 (1.5 pairs) for its width.
- a joined means 11 makes it possible to connect longitudinally the lamellae 5.
- the rectangular peripheral structure 3 has in each of its corner areas abutting means. These comprise, in each of these zones, a central elongate slat 7 having a trapezoidal section and on either side thereof an elongate lamella forming a stop 9 also having a trapezoidal section.
- the trapezoids of the lamellae 9 are inverted with respect to that of the lamella 7 and are oriented so as to produce a conical effect in each corner zone: the small bases of the lamellae 9 and the large base of the lamella 7 are turned towards the hollow of the beam 1.
- the function of the lamellae 7,9 configured in the corner zones is to promote the bonding of the lamellae 5, 7, 9 constituting the beam 1. Indeed, during the bonding, a pressure is generated by pressure chambers (no represented) in the hollow of the beam 1 to be assembled and acts on all of its strips 5, 7, 9 retained for example by strapping (not shown). This pressure then induced by the cone effect in the corner areas of large reaction forces and consequently a strong clamping on the faces of all of the strips 5, 7 and 9. This clamping ensures a particularly effective bonding of the assembly, which strengthens the mechanical strength of the beam 1.
- the different strips 5, 7, 9 are obtained by radial cutting in logs.
- Other means of abutment could of course be imagined, without departing from the scope of the present invention.
- the slats 9 can for example be divided into 2 slats of smaller size.
- Fig. 2 illustrates the advantages associated with this cutting.
- a log 13 undergoes three different cuts.
- conventional non-radial cuts 17 and 19 are made respectively around the marrow and halfway between the marrow and the bark.
- the cutout 17, unlike the radial cutout 15, has the double disadvantage on the mechanical plane of containing relatively a lot of old wood, because close of the marrow, and therefore much less resistant, and to present dark circles whose orientation is opposite.
- the non-radial cutouts 17 and 19 warp to shrinkage during drying, which is not the case of the radial cut 15. This warpage is disadvantageous because it involves subsequent machining and subsequent loss of material.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE2016/0151A BE1024604B1 (fr) | 2016-09-26 | 2016-09-26 | Element de construction allonge creux |
PCT/EP2017/073924 WO2018055043A1 (fr) | 2016-09-26 | 2017-09-21 | Elément de construction allongé creux |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3516128A1 true EP3516128A1 (fr) | 2019-07-31 |
EP3516128B1 EP3516128B1 (fr) | 2020-11-04 |
Family
ID=57208003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17768472.7A Active EP3516128B1 (fr) | 2016-09-26 | 2017-09-21 | Elément de construction allongé creux |
Country Status (6)
Country | Link |
---|---|
US (1) | US20210277656A1 (fr) |
EP (1) | EP3516128B1 (fr) |
JP (1) | JP2019533100A (fr) |
BE (1) | BE1024604B1 (fr) |
CA (1) | CA3034167A1 (fr) |
WO (1) | WO2018055043A1 (fr) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB781627A (en) | 1955-06-28 | 1957-08-21 | Gottfried Esser | Improvements in or relating to composite wooden beams |
US4394409A (en) * | 1977-09-22 | 1983-07-19 | Weyerhaeuser Company | Composite wood article and method of manufacture |
NO150525C (no) | 1979-05-31 | 1992-02-11 | Hallvard Berge | Trestolpe for kraftlinjer eller liknende, samt maskin forfremstilling av samme |
SE8005271L (sv) | 1980-07-18 | 1981-06-22 | Aos Metall Mek Verk | Sett och anordning for att eliminera obehag fororsakande flimmer vid betraktande av rontgenfilm i ljusskap |
NL8004909A (nl) * | 1980-08-29 | 1982-04-01 | Petrus Johannus Maria Meegdes | Holle houtconstructie. |
US5438812A (en) | 1993-12-23 | 1995-08-08 | Regents Of The University Of Minnesota | Hollow veneered pole |
US5865929A (en) * | 1995-06-21 | 1999-02-02 | Sing; Peter | Method of producing laminated wood beams |
DE19613237C2 (de) * | 1996-04-02 | 1999-06-02 | Kirst Ralph Dipl Ing Fh | Balken und Verfahren zu dessen Herstellung |
NL1017360C2 (nl) | 2001-02-14 | 2002-08-15 | Leonardus Anthonius Ligtenberg | Schip voorzien van een hol rondhout. |
ATE324965T1 (de) | 2001-07-19 | 2006-06-15 | Fries Petra | Verfahren und einrichtungen zum einschnitt und zur profilierung von trapezlamellen für trapezlamellenbalken |
SE538283C2 (sv) | 2014-08-08 | 2016-04-26 | Stora Enso Oyj | A gluelam structural member and a method of producing such a gluelam structural member |
-
2016
- 2016-09-26 BE BE2016/0151A patent/BE1024604B1/fr not_active IP Right Cessation
-
2017
- 2017-09-21 EP EP17768472.7A patent/EP3516128B1/fr active Active
- 2017-09-21 US US16/336,754 patent/US20210277656A1/en not_active Abandoned
- 2017-09-21 CA CA3034167A patent/CA3034167A1/fr not_active Abandoned
- 2017-09-21 WO PCT/EP2017/073924 patent/WO2018055043A1/fr active Application Filing
- 2017-09-21 JP JP2019515583A patent/JP2019533100A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
BE1024604B1 (fr) | 2018-04-25 |
BE1024604A1 (fr) | 2018-04-18 |
EP3516128B1 (fr) | 2020-11-04 |
JP2019533100A (ja) | 2019-11-14 |
WO2018055043A1 (fr) | 2018-03-29 |
US20210277656A1 (en) | 2021-09-09 |
CA3034167A1 (fr) | 2018-03-29 |
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