WO2021116305A1 - Structure en bois autoextinguible - Google Patents

Structure en bois autoextinguible Download PDF

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Publication number
WO2021116305A1
WO2021116305A1 PCT/EP2020/085572 EP2020085572W WO2021116305A1 WO 2021116305 A1 WO2021116305 A1 WO 2021116305A1 EP 2020085572 W EP2020085572 W EP 2020085572W WO 2021116305 A1 WO2021116305 A1 WO 2021116305A1
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WO
WIPO (PCT)
Prior art keywords
board
assembly
clt
boards
lamella
Prior art date
Application number
PCT/EP2020/085572
Other languages
English (en)
Inventor
Geir Jensen
Alexander JENSEN
Original Assignee
Fss Tre As
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 Fss Tre As filed Critical Fss Tre As
Priority to EP20833734.5A priority Critical patent/EP4072854A1/fr
Publication of WO2021116305A1 publication Critical patent/WO2021116305A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/14—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood board or veneer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N9/00—Arrangements for fireproofing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/13—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board all layers being exclusively wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/14—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a face layer formed of separate pieces of material which are juxtaposed side-by-side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/18—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by an internal layer formed of separate pieces of material which are juxtaposed side-by-side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/263—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer having non-uniform thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/03—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers with respect to the orientation of features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B32B7/14—Interconnection of layers using interposed adhesives or interposed materials with bonding properties applied in spaced arrangements, e.g. in stripes
    • 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
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/10—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products
    • E04C2/12—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products of solid wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/708—Isotropic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2607/00—Walls, panels

Definitions

  • the present invention is related to a self-extinguishing timber structure comprising one or more cross laminated timber (CLT) elements, each CLT element comprising a plurality of lamellae and each lamella comprises one or more board sections.
  • CLT cross laminated timber
  • the lamella and board sections are arranged such that during an enclosure fire, the at least one of the plurality of lamellae and/or at least one of the board sections char seamlessly, and/or delaminates at different points in time than the adjacent lamellae and/or boards.
  • Solid homogenous wall elements of thicknesses 50- 200 mm are not available today due to high cost, less practical to manufacture without warping and susceptibility of developing cracks in use.
  • the most common timber wall elements used today are cross-laminated ones (CLT).
  • Cross-laminated timber is a wood panel product made from gluing layers of solid-sawn lumber together. Each layer of boards is usually oriented perpendicular to adjacent layers and bonded to the wide faces of each board, usually in a symmetric way so that the outer layers have the same orientation.
  • Regular timber is an anisotropic material, meaning that the physical properties change depending on the direction at which the force is applied. By gluing layers of wood at right angles, the panel is able to achieve better structural rigidity in both directions. It is similar to plywood but with distinctively thicker laminations (or lamellae).
  • CLT cross laminated timber
  • All CLT elements have layers of wood (lamellae), typically glued together.
  • the protective layer or some areas of the first timber lamella may be abruptly detach from the wood element and drop down simultaneously. Because the room fire is uniform at his stage, this detachment will occur about the same time for all first lamella of the CLT wall elements in the room (ceiling CLT elements may delaminate a bit earlier).
  • This simultaneous separation of the protective layers or the first timber lamellae will expose uncharred fresh surface of the next lamella layers of the CLT element, which will cause the fire heat release rate (HRR) to regain substantially by radiation and reradiation.
  • the HRR is the rate of heat generated by fire. It is a measure of the heat that is available in every square meter of surface absorbing heat within a particular surface. The HRR may be measured in Joules per second or Watts.
  • the number of exposed wood walls in a room may be increased to three or all four, depending on type of ceiling and ventilation openings of room on fire. This is what the market and architects are craving for and yet out of reach.
  • a strong incentive for using CLT in buildings are to allow the wooden surfaces to be exposed.
  • One incentive of the present invention is to avoid or at least reduce the use of chemicals such as fire retardants and glue in the CLT elements.
  • the aim of the present invention is to provide a wood structure or a wood element that resolve or at least mitigate one or more of the above- mentioned problems related to fire.
  • the major aim of the present invention is to provide a wood structure or element that in case of a fire will have increased probability of self-extinction without use of fire retardants, without restrictions on type of glue and without protection by such as but not limited to boards of gypsum, calcium silicate or fiber cement.
  • the present invention is related to a self-extinguishing cross laminated timber (CLT) element comprising a plurality of lamellae arranged to form the CLT element, each lamella comprises one or more board sections arranged side by side to form one lamella.
  • CLT cross laminated timber
  • At least one lamella of the plurality of lamellae comprises at least one or more board sections arranged with different thickness in relation to adjacent board section, such that during an enclosure fire the at least one of the one or more board sections char seamlessly, and/or delaminates at different points in time than the adjacent board section.
  • adjacent is directed to a neighboring board section having substantially same orientation and located within the same lamella or a neighboring lamella.
  • cross laminated wood element may be a CLT element or wood panel made from layers of board sections or solid-sawn timber joined together. Each layer may comprise one or more board sections of solid or semi-solid lumber and may be oriented perpendicular or at least with an angle to adjacent layers and glued on the wide faces of each board.
  • the plurality of lamellae may be attached together by graded edges, adhesives, glass-fiber reinforced adhesive glue, dowels, interlocking, joinery, nails or other means of bonding lamellae to each other.
  • each board sections and lamella delaminate layer by layer as the fire burns into or through the cross laminated timber element, as disclosed in prior art.
  • the present invention provides a self-extinguishing cross laminated timber (CLT) element by avoiding that most of the lamellae delaminates at the same time and expose the fresh lamella wood layer behind and causing the heat release rate (HRR) to increase.
  • HRR heat release rate
  • the char layer of the present invention will be attached to the CLT element for a longer time, thus protecting the fresh wood layer behind.
  • the CLT element of the present invention may respond to fire similar to a solid timber, and by a protective char layer that ensure self-extinguishing and prevent secondary flashovers.
  • One objective of the present invention is to extend the time of burn-through of CLT by non-treated wooden parts geometrically configured to avoid delamination.
  • the mating surface between the at least one or more board sections and the adjacent board sections comprises neighboring board sections that has different thickness in relation to each other.
  • Each of the one or more board sections may comprise an assembly of boards or at least one of the one or more board sections may comprise an assembly of boards.
  • a board section may therefore comprise one board or comprise two or more boards arranged in a series/layers to form one board section.
  • the boards arranged in an assembly of boards are also referred to as sub-boards.
  • the at least one lamella may comprise a first assembly of boards and a second assembly of boards arranged alternating side by side to form the lamella.
  • Each of the first assembly and the second assembly of boards may comprise an upper sub board arranged above a lower sub-board.
  • the upper sub-board of the first board assembly may have a thickness different than the upper sub-board of the second board assembly such that the upper sub-boards of the first and second board assembly are staggered in relation to each other.
  • the upper sub-board of the first board assembly may have same thickness as the lower sub-board of the second board assembly, and the lower sub-board of the first board assembly, has same thickness as the upper sub-board of the second board assembly.
  • upper and lower sub-boards dictates the shape of the assembly which is then preferably rectangular or square cross-sectional shape.
  • the upper and lower sub-board of the first assembly of boards may be respectively a thin board bonded to a thick board.
  • the arrange ment is opposite such that the upper sub-board is thick and bonded on top of a thin board.
  • the first and second assembly of boards are then bonded together at their sides such that the upper layers of sub-boards has a staggered relation in relation to each other. Hence, the upper layer of the sub-boards of the first and second board assembly has different thickness.
  • the thin layers will delaminate first, and the thick layers delaminate at a later stage. Thus, avoiding a sudden and simultaneous delamination of the upper layer.
  • each of the first and second assembly of boards may comprise the upper sub-board having a varying thickness from one side of the assembly of boards to another, and the lower sub-board having a varying thickness in opposite direction than the upper sub-board.
  • the upper sub-board may have a decreasing thickness from the one side of the assembly of boards to another, and wherein the lower sub-board may have an increasing thickness from the one side of the assembly of boards to another, in opposite direction of the upper sub-board.
  • the first and second assembly of boards may have the same assembly of sub-boards with varying thickness, such that when they are bonded together and arranged alternating first and second assembly of boards, the upper layer of the sub-boards are arranged in a staggered manner in relation to each other.
  • the thin side of the varying thickness upper sub-board of the first assembly of boards is facing the thick side of the varying thickness upper sub-board of the second assembly of boards.
  • the lower sub-layer (below the upper sub-layer) of sub boards may be arranged in a staggered manner such that the seamless charring will continue into this layer.
  • the one or more board sections may have same thickness such that the at least one lamella of the plurality of lamellae has an even thickness across the CLT element.
  • Each lamella of the plurality of lamella are oriented perpendicular to adjacent lamellae, and wherein each lamella may comprise a number of board assemblies according to the embodiments described above.
  • Each lamella may have even thickness across the entire lamella, meaning that the board or assembly or boards of the lamella, all have same thickness.
  • the lamella may be oriented perpendicular to adjacent lamella and bonded to the wide faces of each board, in a symmetric way so that the outer layers (lamellae) have the same orientation.
  • the self-extinguishing cross laminated timber (CLT) element may constitute one or more CLT sub-elements.
  • the sub-elements may be connected such that they form the self-extinguishing cross laminated timber (CLT) element.
  • the self-extinguishing cross laminated timber (CLT) element may comprise a first sub-element and a second sub-element, wherein the first assembly of board is arranged on the first-sub element and the second assembly of boards is arranged on the second sub-element, and wherein the first assembly of board has different thickness in relation to adjacent second assembly of boards.
  • the self-extinguishing cross laminated timber (CLT) element and/or sub-element may be provided with a locking system provided on at least two opposite ends of the CLT element and/or sub-element, for connection to another symmetric or asymmetric CLT element and/or sub-element.
  • the locking system may comprise a first receiving structure and a second mating structure arranged at opposite ends, the first receiving structure comprises an interface complementary to the second structure.
  • the CLT elements may be connected by graded edges, click boards, finger joints, joinery, adhesives, glass fiber-reinforced adhesives, glue or combinations thereof.
  • the intention of the present invention is to allow local delamination to occur at different points in time to even out the fire HRR over time and thus allowing new char layer to gradually build on next layer of fresh wood.
  • the structural integrity of the CLT element may be strengthen or if a wide continuous surface finish is preferable, a 20mm layer of lamella (or other dimensions) may be arranged as the outer layer, covering the board sections with different thickness. This outer layer will participate in the burn-out phase of room furniture, and such that the self-extinguishing phase starts when the protective char layers are established on top of the different thickness boards.
  • the intention is also to ensure delamination of a single lamella to occur over a period of time rather than abrupt, to further even out the HRR and avoid HRR peaks.
  • a major impact of the present invention may be to enable self-extinction, prevent regrowth of fire, prevent secondary flashovers and prevent increased exposure to fa ade.
  • Figure 1 shows a prior art CLT element comprising five layers (lamellae).
  • Figure 2 a) shows a section of a CLT element comprising three lamellae, each lamella comprising plurality or board sections and each board section comprises assembly of boards.
  • Figure 2 b shows a cross section of the CLT element section in figure 2 a).
  • Figure 3 a shows a first and second assembly or boards, where each assembly comprises sub-boards with varying thickness.
  • Figure 3 b shows a cross section of the CLT element in figure 3 a).
  • Figure 4 shows graphically the HRR rate over time during a room fire, the first in a room of solid wood panels and the second in a room of CLT panels where lamellae delaminated.
  • Figure 5 shows graphically the Mass Loss Rate (g/m2’*s) over time, during a room fire in a room with respective solid wood panels CLT panels.
  • Figure 6 shows graphically the Mass Loss Rate (g/m2’*s) over time of figure 5, where the Mass Loss Rate of the present invention is shown.
  • FIG 1 shows a prior art cross-laminated timber (CLT) element 10.
  • the CLT element 10 is a wood panel product made from layers (lamellae) 11 of solid-sawn lumber joined together.
  • Each lamella 11 comprises boards 12 oriented perpendicular to adjacent lamella 11 and bonded on the wide faces of each board 12.
  • the boards
  • each lamella 11 are bonded side by side providing a bond line 18 between the boards.
  • the lamellae 11 are further arranged symmetric such that outer layers (top and bottom) have the same orientation.
  • An odd number of lamellae (such as 3, 5 or 7 layers) are most common, but there are configurations with even numbers as well (which are then arranged to give a symmetric configuration).
  • the figure 1 shows CLT element having 5 layers or lamellae 11.
  • the outer lamellae are arranged symmetric about the center lamella, and all lamellae has same thickness.
  • the figure 2 a) shows an embodiment of the present invention where the CLT element comprises three lamellae 11, each lamella 11 comprises a plurality of board sections 12 and each board section 12 comprises an assembly of two sub-boards (upper and lower) arranged one over another.
  • the one or more boards 12 section may comprise one board or an assembly of boards 13,14.
  • the sub-boards may be an upper sub-board 15 arranged above a lower sub-board 16.
  • the at least one lamella 11 may comprise a first assembly of boards
  • the thickness of the boards are different or staggered.
  • the upper sub-board 15 of the first assembly of boards 13 may be a thin board, arranged above a lower sub-board 16 which is a thick board, both sample embodiments 160 mm wide and respectively 30 and 50 mm thick so assembly is rectangular 160x80 mm.
  • the first assembly of board 13 is arranged to be bonded to the second assembly of boards 14, where the second assembly of boards 14 comprises an upper sub-board which is thick and a lower sub-board which is thin (opposite than the first assembly of boards).
  • the upper sub-board 15 of the first and second assembly of boards 13,14 will have a thin board facing a thick board.
  • the thin layers will delaminate first, and the thick layers delaminate at a later stage. This arrangement avoids the sudden and simultaneous delamination of the upper layer of sub-boards 15 throughout the CLT element.
  • Figure 2 a) and 2 b) shows a three-layer (lamellae) CLT element, where each layer comprises a plurality of first and second assembly of boards 13,14 arranged alternating.
  • the middle layer is arranged perpendicular and bonded together with the upper and lower layer (lamella).
  • each of the first and second assembly of boards 13,14 may comprise the upper sub-board having a varying thickness from one end of the assembly of boards 13,14 to another, and the lower sub-board 16 having a varying thickness in opposite direction than the upper sub-board 15.
  • FIG 2b also shows that the self-extinguishing cross laminated timber (CLT) element 10 may constitute one or more CLT sub-elements 20.
  • the sub-elements 20 may be connected/bonded at an interface 21, between the sub-elements 20, such that they form the self-extinguishing cross laminated timber (CLT) element 10.
  • the self-extinguishing cross laminated timber (CLT) element may comprise a first sub-element 20 and a second sub-element 20, wherein the first assembly of board 13 is arranged on the first-sub element 20 and the second assembly of boards 14 is arranged on the second sub-element 20, and wherein the first assembly of board 13 has different thickness in relation to adjacent second assembly of boards 14.
  • the figure 3 a shows a first assembly of boards 13 and a second assembly of boards 14.
  • Each assembly of boards 13,14 comprises an upper sub-board 15 and a lower sub-board 16 having varying thickness.
  • the upper sub-board 15 may have a decreasing thickness from the one end of the assembly of boards 13,14 to another, and wherein the lower sub-board 16 may have an increasing thickness from the one end of the assembly of boards 13,14 to another, in opposite direction of the upper sub-board 15.
  • the upper sub-board 15 and lower sub-board 16 are bonded together at a bond line 18.
  • the thin edge is 15 mm and the thick edge 65 mm, both boards 120 mm wide, so the assembly of boards provides a rectangular board section of 120x80 mm.
  • the first and second assembly of boards 13,14 may have same arrangement of upper and lower sub-boards 15,16. When they are bonded together at a bond line 18 and arranged alternating first and second assembly of boards, the upper layer of the sub boards 15 are arranged in a staggered manner in relation to each other.
  • the thin end of the varying thickness upper sub-board 15 of the first assembly of boards 13, is facing the thick end of the varying thickness upper sub-board 15 of the second assembly of boards 14.
  • the CLT element may comprise three layers (lamella) where all lamella comprises a plurality of first and second assembly of boards 13,14 arranged alternating.
  • the first and second assembly 13,14 of boards has same structure.
  • the middle lamella 11 is arranged perpendicular to the upper and lower lamella 11 and all lamellas 11 has the same structure with varying thickness sub-boards 15,16.
  • sub-board 15 During an enclosure fire the upper layer of sub-board 15 char seamlessly, meaning that the charring takes place at a fixed rate across the sub-board due to the varying thickness.
  • the lower sub-layer (below the upper sub-layer) of sub-boards 16 are also arranged in a staggered manner such that the seamless charring will continue into this layer.
  • the first graph a) Betal, in Figure 4 shows a graph of the Heat Release Rate (HRR) over time (duration) for a wall element of solid wood during a room fire.
  • HRR Heat Release Rate
  • the HRR is a rate of heat produced by the fire and is available to all exposed surfaces. The accumulated heat exposing wood surfaces will ignite them at certain level of heat or radiation. HRR are measured in Joules per second or Watts (Megawatt).
  • the graph shows that the HRR increases rapidly in a room fire when the outer surface of the solid wood element gets involved.
  • the HRR increases and has a peak of about 5 Megawatt at 10-20 min., during which a char layer has been built on the outer surface of the solid wood element. Due to the char layer of the wood which is always protecting the fresh wood behind, the HRR rate will drastically drop after approximately 20 min, when all the contents in the room is burnt away. The added heat to the solid wood surface will decrease and the HRR rate will drop drastically, causing the fire to self-extinguish in the decay phase.
  • the graph b) Beta2, of figure 4 shows a graph of the Heat Release Rate (HRR) over time (duration) for a wall element of CLT panel during a room fire.
  • the CLT panel which comprises a plurality of layers, will have the same fire development as for the solid wood in the decay phase.
  • the HRR increases quickly to a peak of about 5 MW in about 10-15 min. Due to the development of the char layer (first layer), the HRR drops when all the contents in the room is burnt away at about 15 min. When the first layer is burnt through the remaining of the first layer may be abruptly detach from the CLT panel and drop down simultaneously. Because the room fire is uniform at his stage, this detachment will occur about the same time for all first layers of the CLT panels in the room.
  • Figure 3 and 4 are taken from the publication: "Analysis of cross-laminated timber charring rates upon exposure to non-standard heating conditions”, by Bartlett, University of Edinburgh.
  • FIG. 5 shows graphically the Mass Loss Rate (MLR) in weight (in grams) per square meter per second over a time duration (in minutes).
  • MLR Mass Loss Rate
  • the solid line disclosing a MLR for a room fire in a room having solid wood panels.
  • the MLR increases rapidly as the solid wood panel takes fire and establishes a char layer.
  • the MLR drops significantly in accordance with the drop of the HRR, which eventually leads to self-extinction of the fire.
  • the dotted line in figure 4 shows a traditional CLT panel with a plurality of layers, where the MLR decreases after a char layer has been built up on the outer surface of the CLT panel.
  • the MLR increase again when the reignition and flashover starts on the fresh wood behind the outer layer, causing the MLR to increase until a new char layer has been established.
  • the dotted line in figure 5 shows the time when the delamination occurs, resulting in an increase in MLR just after the delamination.
  • Figure 6 shows the same graphs of figure 5, but with the graph of a CLT panel according to the present invention included.
  • This graph in thick solid line qualitatively illustrates the effect of the invention by the embodiment shown by figure 2 a) and b). Due to the avoided sudden delamination of the outer layer the peaks of the MLR may be prevented by allowing delamination to occur at different times in order to even out the fire HRR over time and thus allowing new char layer to gradually build on next layer of fresh wood.
  • a curve to qualitatively illustrate the effect of embodiment as of figure 3 a) and b) would be smooth and overlap fully the thin solid line (not shown).
  • the CLT wood panels of the present invention allows delamination of a single lamella (layer) to occur over a period of time rather than abrupt, to further even out the HRR and avoid HRR peaks, thus also the Mass Loss Rate (MLR).
  • MLR Mass Loss Rate

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Architecture (AREA)
  • Manufacturing & Machinery (AREA)
  • Forests & Forestry (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
  • Fireproofing Substances (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

Un élément bois lamellé-croisé (CLT) autoextinguible comprenant une pluralité de lamelles agencées pour former l'élément CLT. Chaque lamelle comprend une ou plusieurs sections planches disposées côte à côte pour former une lamelle. Ladite lamelle de la pluralité de lamelles comprend au moins une ou plusieurs sections planches agencées avec une épaisseur différente par rapport à des sections planches adjacentes, de sorte qu'au cours d'un incendie en espace clos, ladite section planche se carbonise facilement et/ou se délamine à des moments différents contrairement aux sections planches adjacentes.
PCT/EP2020/085572 2019-12-11 2020-12-10 Structure en bois autoextinguible WO2021116305A1 (fr)

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NO20191468 2019-12-11
NO20191468A NO345746B1 (en) 2019-12-11 2019-12-11 A self-extinguishing cross laminated timber (CLT) element

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202013006624U1 (de) * 2013-07-23 2013-08-06 Daniel Heite Brettsperrholz aus Keilbohlen
WO2017072687A1 (fr) * 2015-10-28 2017-05-04 Stora Enso Oyj Produits de bois d'ingénierie et leurs procédés de fabrication
EP3424657A1 (fr) 2017-07-07 2019-01-09 UPM Plywood Oy Panneau de contre-plaqué résistant au feu et procédé permettant d'améliorer la résistance au feu d'un panneau de contre-plaqué

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE445568B (sv) * 1984-10-08 1986-06-30 Hammarberg Lars Skivmaterial, foretredesvis for anvendning som gjutformskiva, uppbyggt av kompositlaminat med glasfibersnoren i ytterskikten
AU2011202472B2 (en) * 2010-05-31 2014-07-17 Lignor Limited Cross laminated strand product
JP2016204958A (ja) * 2015-04-21 2016-12-08 旭化成建材株式会社 耐火クロス・ラミネイティド・ティンバー
DE102016113132B3 (de) * 2016-07-15 2017-09-28 Simon Aicher Brettsperrholz-Platte
FR3056997B1 (fr) * 2016-10-03 2021-09-17 Leko France Systeme constructif a lames structurelles croisees
WO2018107288A1 (fr) * 2016-12-14 2018-06-21 Fpinnovations Tapis insonorisant, son procédé de fabrication, système de commande de bruit le comprenant et son utilisation
RS1544U1 (sr) * 2018-02-20 2018-05-31 Kujundzic Vojislav Konstrukcija višeslojnog lepljenog krstasto lameliranog drvenog panela
CN109434975A (zh) * 2018-12-18 2019-03-08 南京工业大学 综合速生材材质特征及建筑结构需求的正交胶合木及其制备方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202013006624U1 (de) * 2013-07-23 2013-08-06 Daniel Heite Brettsperrholz aus Keilbohlen
WO2017072687A1 (fr) * 2015-10-28 2017-05-04 Stora Enso Oyj Produits de bois d'ingénierie et leurs procédés de fabrication
EP3424657A1 (fr) 2017-07-07 2019-01-09 UPM Plywood Oy Panneau de contre-plaqué résistant au feu et procédé permettant d'améliorer la résistance au feu d'un panneau de contre-plaqué

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BARTLETT: "Analysis of cross-laminated timber charring rates upon exposure to non-standard heating conditions", UNIVERSITY OF EDINBURGH

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EP4072854A1 (fr) 2022-10-19
NO345852B1 (en) 2021-09-06
NO20200247A1 (en) 2021-06-14
NO345746B1 (en) 2021-07-12
NO20191468A1 (en) 2021-06-14

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