EP2787141B1 - Building Component - Google Patents
Building Component Download PDFInfo
- Publication number
- EP2787141B1 EP2787141B1 EP14151329.1A EP14151329A EP2787141B1 EP 2787141 B1 EP2787141 B1 EP 2787141B1 EP 14151329 A EP14151329 A EP 14151329A EP 2787141 B1 EP2787141 B1 EP 2787141B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- timber
- chords
- building component
- fixings
- component
- 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.)
- Active
Links
- 239000002184 metal Substances 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 17
- 239000003063 flame retardant Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
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
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
- E04C3/292—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being wood and metal
-
- 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
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
Definitions
- the present invention relates to a building component for use in the built environment, such as may serve as a floor joist, roof rafter or wall stud, manufactured with timber chords separated by metal V shaped webs with integral teeth at their extents.
- Solid timber generally has a predicted burn rate and the charring of the timber protects the un-burnt core, however when timber burns the edges of the timber (arris) are attacked by fire so square edges become round and any short teeth connectors in the edge become less effective.
- the last row of teeth on the integral connector plates at the extent of the metal webs become less effective during and after a fire, and this weakens the joist or rafter.
- open web joists such as described in GB 2470721 allow fire to spread both longitudinally and laterally across the floor deck so the rate of spread of flame is greater than for a solid timber section.
- EP 1609920 describes a building framework which comprises studs and which are coupled together by separate bracing elements which together form a bracing unit.
- the bracing unit is provided between a top plate and bottom plate.
- the bracing elements extend substantially all of the way from the top plate to the bottom plate.
- the bracing unit may have more studs.
- US 4,295,318 discloses a building component according to the preamble of claim 1.
- a building component for use in a built environment, the component comprising: two generally parallel elongate timber chords; a plurality of metal web connectors for connecting the timber chords; a plurality of primary metal fixings integral with the web connectors adapted to penetrate and engage the timber chords to attach the metal web connectors to the timber chords; a plurality of holes in the web connectors formed by stamping the primary metal fixings; and a plurality of secondary metal fixings driven through the respective holes in the metal web connectors so as to extend further into the timber of the timber chords than the integral primary metal fixings, and to increase the integrity of the component if the timber suffers fire damage.
- the secondary fixings connecting end region web connectors extend into the timber to a depth of at least one twentieth the width of the timber chord, more preferably at least one tenth, even more preferably at least one quarter, and optionally at least one third and up to one half the width of the chord.
- the secondary fixings may comprise nails, screws or staples.
- the nails, screws or staples are driven through holes or slots in the metal web connectors. They may be engaged during the manufacturing process or alternatively engaged during installation of the building component on site during a build.
- the integral primary fixings are stamped out of the web connectors and formed as teeth shapes protruding perpendicular to the plane of the web connector.
- the secondary fixings are driven through holes formed in this stamping process.
- the secondary fixings are not integral with the web connector. They extend into the core of the timber. They increase the structural integrity of the component which is particularly useful during fire load, i.e. when the timber is damaged by fire which tends to burn the edges of timber more so that the outer rows of integral primary fixings on the web connectors are less effective.
- the building component of the invention may additionally comprise a non-combustible material, of flexible and/or rigid composure, which may optionally be compressed as a tight fit between the timber chords.
- Stonewool is one suitable material which does not shrink when subjected to high temperatures.
- the material is flexible.
- it is rigid rather than supplied in a roll.
- the non-combustible material is compressed between the timber chords to provide a tight fit.
- the non-combustible material does not shrink when subjected to high temperatures.
- stonewool One example of a suitable non-combustible material is commonly known as stonewool.
- stonewool There are a number of proprietary brands which are readily available in standard batt widths and lengths which are easily cut either in the factory during manufacture of the building item, or on site, for example to allow passage of building services such as pipes and wires.
- This arrangement serves to retard the spread of fire and reduce the rate of spread of flame, for example laterally across a floor deck which uses such building items as floor joists, or through a roof which uses such items as roof rafters, or through a wall which uses such building items as wall studs.
- the rows of connectors in the integral connector plate ends of the metal webs which may have become ineffective if the timber edges have burnt away, forming a round rather than square edge, are still effective because of the secondary fixings comprising enhanced nails, screws or staples driven through the connector into the un-burnt solid core of the timber chords.
- the additional fixings not only restore the effectiveness of the integral connector plated ends of the metal webs during or after a fire but increase the anchorage strength capacity of the metal webs even if there is no fire.
- both aspects of the invention can be combined to provide a building component which has increased fire retardance and increased effectiveness even after a fire.
- Figure 1 shows a building component 1 which may form a floor joist, roof rafter or wall stud. It comprises two parallel timber chords 2, 3 and two metal web connectors 4, 5 which hold the timber chords 2, 3 in spaced relationship.
- the metal web connectors 4, 5 are formed by stamping metal forms and folding over the long edges 6 to increase strength. They have metal teeth (not shown) integrally formed of the metal, at the extremities (in the regions 7 and 8) and these teeth penetrate the wood of the timber chords 2, 3. These teeth are indicated more clearly in Figure 4 which shows the rectangular holes 18 formed by stamping teeth shapes so that they protrude perpendicular to the plane of the web connector.
- Figure 2 illustrates a similar building component 1 according to the invention.
- the metal web 4 is connected to the timber chords 2, 3 by additional protruberances such as fixings 10 which may be nails, screws or staples. These are driven through the metal web 4 into the timber of the chords 2, 3 so as to penetrate further into the timber than the integral teeth of the web 4.
- Figure 3a shows two such building components 1A, 1B arranged to support a floor deck 12.
- the nails, screws or staples 10 penetrate a significant distance into the timber, preferably into the core of the timber chords.
- the nails, screws or staples 10 achieve advantages by penetrating at least one twentieth of the thickness of the chord but increasing advantages can be achieved if they penetrate one tenth, one fifth, one quarter, one third or one half of the thickness.
- Figure 3b is an enlarged view of part of one timber chord showing that the nails or screws 10 penetrate significantly more than the integral metal teeth 19.
- the integral teeth 19 typically extend around 8mm into the timber whereas the nails or screws forming secondary fixings 10 might typically extend 50mm into the timber.
- Timber chords may typically be up to about 147mm wide.
- a fire retardant material 15 is located between the chords 2, 3 to prevent, or at least reduce, the spread of fire longitudinally and laterally.
- This may be stonewool material or any other known fire retardant. It is preferably flexible but rigid enough to be self-supporting in the space between the chords 2, 3.
- the webs 4, 5 help to retain the fire retardant material 15 in place.
- the material 15 may also be compressed and is resistant to shrinking at extreme temperatures, e.g. high heat.
- the nails, screws or staples 10 are preferably driven through the holes 18 in the web 4, which are formed when the integral teeth are stamped out. This can be seen more clearly in Figure 4 .
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Building Environments (AREA)
- Joining Of Building Structures In Genera (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Rod-Shaped Construction Members (AREA)
Description
- The present invention relates to a building component for use in the built environment, such as may serve as a floor joist, roof rafter or wall stud, manufactured with timber chords separated by metal V shaped webs with integral teeth at their extents.
- Fire is a hazard during most construction processes and it is important that precautions are in place to mitigate the risk of spread of fire to adjacent buildings. Timber framed buildings including their associated timber floors are more vulnerable to fire during the construction phase because the linings to the walls and ceilings which the timber frame and timber floors relies upon to give fire protection are not normally in place until the whole timber frame building is complete.
- There has been a lot of research and development over the last few years leading to the development of chemicals and processes which when impregnated into exposed timber studs, chords and decking boards offer fire retardant attributes reducing the spread of flame whilst not reducing the structural properties of the timber members and not corroding metal fixing driven into these fire retardant treated components; which was a problem with older fire retardant chemicals and processes.
- There has also been a lot of research and development of different types of timber frame construction where either reduced combustion or non-combustible internal and external linings form part of the pre-manufactured timber frame walls, offering immediate protection of the timber stud members within the wall and not providing a material which can burn or easily spread flame to adjacent components which are combustible.
- Solid timber generally has a predicted burn rate and the charring of the timber protects the un-burnt core, however when timber burns the edges of the timber (arris) are attacked by fire so square edges become round and any short teeth connectors in the edge become less effective. For pre-formed timber joists or rafters formed by joining timber chords with metal webs, as described in applicant's patent publication
GB 2470721 - In addition open web joists such as described in
GB 2470721 -
EP 1609920 describes a building framework which comprises studs and which are coupled together by separate bracing elements which together form a bracing unit. The bracing unit is provided between a top plate and bottom plate. The bracing elements extend substantially all of the way from the top plate to the bottom plate. The bracing unit may have more studs.US 4,295,318 discloses a building component according to the preamble ofclaim 1. - According to one aspect of the present invention there is provided a building component for use in a built environment, the component comprising: two generally parallel elongate timber chords; a plurality of metal web connectors for connecting the timber chords; a plurality of primary metal fixings integral with the web connectors adapted to penetrate and engage the timber chords to attach the metal web connectors to the timber chords; a plurality of holes in the web connectors formed by stamping the primary metal fixings; and a plurality of secondary metal fixings driven through the respective holes in the metal web connectors so as to extend further into the timber of the timber chords than the integral primary metal fixings, and to increase the integrity of the component if the timber suffers fire damage.
- The secondary fixings connecting end region web connectors extend into the timber to a depth of at least one twentieth the width of the timber chord, more preferably at least one tenth, even more preferably at least one quarter, and optionally at least one third and up to one half the width of the chord.
- The secondary fixings may comprise nails, screws or staples.
- The nails, screws or staples are driven through holes or slots in the metal web connectors. They may be engaged during the manufacturing process or alternatively engaged during installation of the building component on site during a build.
- The integral primary fixings are stamped out of the web connectors and formed as teeth shapes protruding perpendicular to the plane of the web connector. The secondary fixings are driven through holes formed in this stamping process.
- The secondary fixings are not integral with the web connector. They extend into the core of the timber. They increase the structural integrity of the component which is particularly useful during fire load, i.e. when the timber is damaged by fire which tends to burn the edges of timber more so that the outer rows of integral primary fixings on the web connectors are less effective.
- The building component of the invention may additionally comprise a non-combustible material, of flexible and/or rigid composure, which may optionally be compressed as a tight fit between the timber chords. Stonewool is one suitable material which does not shrink when subjected to high temperatures.
- Preferably the material is flexible. Advantageously it is rigid rather than supplied in a roll.
- According to one embodiment the non-combustible material is compressed between the timber chords to provide a tight fit.
- Preferably the non-combustible material does not shrink when subjected to high temperatures.
- One example of a suitable non-combustible material is commonly known as stonewool. There are a number of proprietary brands which are readily available in standard batt widths and lengths which are easily cut either in the factory during manufacture of the building item, or on site, for example to allow passage of building services such as pipes and wires.
- This arrangement serves to retard the spread of fire and reduce the rate of spread of flame, for example laterally across a floor deck which uses such building items as floor joists, or through a roof which uses such items as roof rafters, or through a wall which uses such building items as wall studs.
- The rows of connectors in the integral connector plate ends of the metal webs which may have become ineffective if the timber edges have burnt away, forming a round rather than square edge, are still effective because of the secondary fixings comprising enhanced nails, screws or staples driven through the connector into the un-burnt solid core of the timber chords. The additional fixings not only restore the effectiveness of the integral connector plated ends of the metal webs during or after a fire but increase the anchorage strength capacity of the metal webs even if there is no fire.
- Advantageously both aspects of the invention can be combined to provide a building component which has increased fire retardance and increased effectiveness even after a fire.
-
-
Figure 1 is a perspective view of part of a building component such as a joist or rafter according to the prior art. -
Figure 2 is a perspective view of part of a building component according to the invention. -
Figure 3a is a cross section through two building components according to the invention, andFigure 3b is an enlarged view of part ofFigure 3a . -
Figure 4 is an elevation view of a building component according to the invention. -
Figure 1 shows abuilding component 1 which may form a floor joist, roof rafter or wall stud. It comprises twoparallel timber chords metal web connectors timber chords metal web connectors long edges 6 to increase strength. They have metal teeth (not shown) integrally formed of the metal, at the extremities (in theregions 7 and 8) and these teeth penetrate the wood of thetimber chords Figure 4 which shows therectangular holes 18 formed by stamping teeth shapes so that they protrude perpendicular to the plane of the web connector. -
Figure 2 illustrates asimilar building component 1 according to the invention. Themetal web 4 is connected to thetimber chords fixings 10 which may be nails, screws or staples. These are driven through themetal web 4 into the timber of thechords web 4. - This is illustrated more clearly in
Figure 3a which shows twosuch building components floor deck 12. The nails, screws orstaples 10 penetrate a significant distance into the timber, preferably into the core of the timber chords. The nails, screws orstaples 10 achieve advantages by penetrating at least one twentieth of the thickness of the chord but increasing advantages can be achieved if they penetrate one tenth, one fifth, one quarter, one third or one half of the thickness.Figure 3b is an enlarged view of part of one timber chord showing that the nails orscrews 10 penetrate significantly more than theintegral metal teeth 19. - By way of one example, the
integral teeth 19 typically extend around 8mm into the timber whereas the nails or screws formingsecondary fixings 10 might typically extend 50mm into the timber. Timber chords may typically be up to about 147mm wide. - A fire
retardant material 15 is located between thechords chords webs retardant material 15 in place. Thematerial 15 may also be compressed and is resistant to shrinking at extreme temperatures, e.g. high heat. - The nails, screws or
staples 10 are preferably driven through theholes 18 in theweb 4, which are formed when the integral teeth are stamped out. This can be seen more clearly inFigure 4 . - It will be seen that use of
fire retardant material 15 between chords significantly improves the fire safety of buildings constructed with building components, such as joists, according to the present invention. - Similarly use of the nails, screws or
staples 10 increases the integrity of the building components in the event of a fire, thus making such buildings more robust and resilient to fire damage, and structurally stronger, even if the timber has suffered fire damage.
Claims (13)
- A building component (1) for use in a built environment, the component (1) comprising:two generally parallel elongate timber chords (2, 3);a plurality of metal web connectors (4) for connecting the timber chords (2, 3);a plurality of primary metal fixings (19) integral with the web connectors (4) adapted to penetrate and engage the timber chords to attach the metal web connectors to the timber chords;a plurality of holes (18) in the web connectors (4) formed by stamping the primary metal fixings (19);characterized in that the building component further comprises a plurality of secondary metal fixings (10) driven through the respective holes (18) in the metal web connectors (4) so as to extend into the core of the timber chords and further into the timber of the timber chords (2, 3) than the integral primary metal fixings (19), and to increase the integrity of the component (1) if the timber suffers fire damage;wherein each metal web connector (4) located in an end region of the component (1) is connected to the timber chords (2, 3) by the plurality of secondary fixings (10) which extend into the timber to a depth of at least one twentieth the width of the timber chord (2, 3).
- A building component (1) according to claim 1 wherein the holes are slots.
- A building component (1) according to any one of the preceding claims wherein the holes (18) are rectangular.
- A building component (1) according to any one of claims 1 to 3 wherein each metal web connector (4) located in an end region of the component (1) is connected to the timber chords (2, 3) by a plurality of secondary fixings (10) which extend into the timber to a depth of at least one tenth the width of the timber chord (2, 3).
- A building component (1) according to any one of claims 1 to 3 wherein each metal web connector (4) located in an end region of the component (1) is connected to the timber chords (2, 3) by a plurality of secondary fixings (10) which extend into the timber to a depth at least one third the width of the timber chord (2, 3).
- A building component (1) according to any one of claims 1 to 3 wherein each metal web connector (4) located in an end region of the component (1) is connected to the timber chords (2, 3) by a plurality of secondary fixings which extend into the timber to a depth of at least one half the width of the timber chord.
- A building component (1) according to any one of the preceding claims wherein each metal web connector (4) located in an end region of the component (1) is connected to the timber chords (2, 3) by a plurality of secondary fixings (10) which extend into the timber at least twice as far as the primary fixings (19).
- A building component (1) according to any one of the preceding claims wherein said secondary fixings (10) comprise nails, screws or staples.
- A building component (1) according to any one of claims 1 to 8 further comprising a non-combustible material (15) between the elongate timber chords (2, 3).
- A building component (1) according to claim 9 wherein the material (15) is flexible.
- A building component (1) according to claim 9 or 10 wherein the material (15) is compressed between the timber chords (2, 3).
- A building component (1) according to any one of claims 9 to 11 wherein the material (15) is impervious to shrinkage when subjected to high temperatures.
- A building component (1) according to any one of claims 9 to 11 wherein the material (15) comprises stonewool.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1300725.7A GB2509782A (en) | 2013-01-15 | 2013-01-15 | Building component comprising timber chords and metal web connectors with secondary fixings longer than primary fixings |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2787141A2 EP2787141A2 (en) | 2014-10-08 |
EP2787141A3 EP2787141A3 (en) | 2014-11-05 |
EP2787141B1 true EP2787141B1 (en) | 2017-05-24 |
Family
ID=47758030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14151329.1A Active EP2787141B1 (en) | 2013-01-15 | 2014-01-15 | Building Component |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2787141B1 (en) |
GB (1) | GB2509782A (en) |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE857139C (en) * | 1950-02-23 | 1952-11-27 | Burkhardt Dipl-Ing Hoffmann | Lattice girders made of wooden belts and metal struts and process for its manufacture |
US2937418A (en) * | 1957-11-14 | 1960-05-24 | Sanford Arthur Carol | Wood truss heel joint construction |
GB1232592A (en) * | 1967-05-15 | 1971-05-19 | ||
US3591997A (en) * | 1969-06-19 | 1971-07-13 | James D Tennison Jr | Antiracking support brace for a building wall |
US4295318A (en) * | 1979-07-26 | 1981-10-20 | Monex Corporation | Connector for wooden truss |
GB9408884D0 (en) * | 1994-05-05 | 1994-06-22 | Ollis William J B | Building elements incorporation timber and insulation materials |
DE19952785A1 (en) * | 1999-11-03 | 2001-05-10 | Dieter Haller | Rafter or beam support for heat-insulated roofs has insulating part underneath load-bearing support part and connected to same and on opposite side is connected to shape-stable lower tie |
AU2002952898A0 (en) * | 2002-11-22 | 2002-12-12 | Tec-Truss Holdings Pty Ltd | Composite beams |
ZA200505004B (en) * | 2004-06-21 | 2006-04-26 | Mitek Holdings Inc | Structural framework |
-
2013
- 2013-01-15 GB GB1300725.7A patent/GB2509782A/en not_active Withdrawn
-
2014
- 2014-01-15 EP EP14151329.1A patent/EP2787141B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
GB201300725D0 (en) | 2013-02-27 |
GB2509782A (en) | 2014-07-16 |
EP2787141A2 (en) | 2014-10-08 |
EP2787141A3 (en) | 2014-11-05 |
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