EP1251213A2 - Zusammengesetzte Holztragstruktur für Böden - Google Patents

Zusammengesetzte Holztragstruktur für Böden Download PDF

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Publication number
EP1251213A2
EP1251213A2 EP02251738A EP02251738A EP1251213A2 EP 1251213 A2 EP1251213 A2 EP 1251213A2 EP 02251738 A EP02251738 A EP 02251738A EP 02251738 A EP02251738 A EP 02251738A EP 1251213 A2 EP1251213 A2 EP 1251213A2
Authority
EP
European Patent Office
Prior art keywords
holes
closure
joist
dowels
cross
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.)
Withdrawn
Application number
EP02251738A
Other languages
English (en)
French (fr)
Other versions
EP1251213A3 (de
Inventor
Roger Smith
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.)
Marlow & Co Ltd
Original Assignee
Marlow & Co Ltd
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 Marlow & Co Ltd filed Critical Marlow & Co Ltd
Publication of EP1251213A2 publication Critical patent/EP1251213A2/de
Publication of EP1251213A3 publication Critical patent/EP1251213A3/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
    • E04B5/12—Load-carrying floor structures formed substantially of prefabricated units with wooden beams
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/48—Special adaptations of floors for incorporating ducts, e.g. for heating or ventilating

Definitions

  • This invention concerns structural assemblies of timber which serve as prefabricated roofs or floors (often referred to as decks) for buildings, particularly but not exclusively, timber framed buildings.
  • Prefabricated timber buildings are generally delivered to site in the form of prefabricated wall panels and roof trusses.
  • the ground floor wall panels when erected, provide load-bearing supports for first-floor flooring, the peripheral regions of which will in general provide a bearing for the first floor load bearing wall panels.
  • Timber I-beams are now used in the construction industry as an alternative to solid timber beams, and comprise a thin vertical web, typically made from oriental strand board, and top and bottom chord members (rails or flanges) made from solid or laminated timber.
  • the I-beam section is more structurally efficient than a solid rectangular section and can be made to larger dimensions than is available in solid timber.
  • these beams are used as a direct replacement for solid timber and are supplied to site as individual components for assembly by site carpenters.
  • the assembly details are very similar to those used for solid timber comprising mainly nails or screws for fixing members together with the use of metal joist hangers for load bearing construction.
  • each flooring-panel or deck is constructed on site inter alia from a plurality of parallel spaced-apart fabricated timber I-beam joists each formed from a narrow web of timber and upper and lower rails or flanges formed from laminated veneer lumber, routed to accommodate the upper and lower edges of the web material.
  • the I-beam joists are butt-jointed to the joists (sometimes called rim-beams) which extend orthogonally to the rims of the I-beam joists, with the rim joists cross-nailed on site to the ends of the I-beams.
  • the flooring panel or deck may include areas in which I-beam joists run perpendicularly to other I-beam joists, and are butt-jointed at their ends to a run-joist or another I-beam joist.
  • Such a structure is generally satisfactory when constructed on site as a first floor deck, sandwiched between ground floor and first floor wall panels.
  • handling of such flooring panels or decks after prefabrication, during storage, shipping from factory to site, and when lifted (usually by crane) into position at first floor level, can result in twisting and distortion of the panels, generating significant bending and shearing forces on the joints between the component parts.
  • the result is that the flooring panel can become weakened and in particular joints between the ends of the I-beam joists and rim-joists can open-up.
  • a method of forming a joint between one end of a timber, flanged I-beam joist and a transverse closure such as a rim-joist, wherein the I-beam joist is arranged so that the web of the joist is generally vertical and the flanges of the I-beam sections are above and below the web comprises the steps of:-
  • a roofing or flooring panel is comprised of two or more such I-beam joists in a parallel spaced apart array, with ends of the I-beam joists abutting a perpendicular closure or rim-joist, a similar joint made up of two cross-dowels and co-operating bolts, is provided between the ends of each said I-beam joist and the rim-joists.
  • the cross-dowels may be formed from metal, or from a rigid plastics material or from a composite material.
  • the bolts are typically formed from metal or a rigid plastics material.
  • a load spreading washer may be located between the head of each bolt and the rim-joist, or each bolt head may include an integral load spreading flange for increasing the area of the bolt head which is to make contact with the rim-joist.
  • the ends of the holes through the rim-joist through which the bolts pass into the rim-joist may be enlarged to accommodate the heads of the bolts, so that the latter are wholly contained within the rim-joist.
  • the holes which are to receive the cross-dowels preferably extend generally perpendicular to the laminations.
  • the invention also lies in a prefabricated timber roofing or flooring panel or deck, constructed inter alia from parallel spaced apart laminated timber I-beam joists butt-jointed to the side faces of perpendicularly extending rim-joists at opposite ends of the I-beam joists, wherein the joints between the ends of the I-beam joists and the rim-joists are formed by bolts and cross-dowels, wherein the latter extend perpendicularly to the laminations forming the upper and lower rails (flanges) of the I-beam joists and the bolts extend transversely through the rim-joists and are threadedly engaged in the cross-dowels.
  • the invention also lies in a laminated timber I-beam joist having cross-dowels located transverse to the direction of the laminations forming the upper and lower rails (flanges) of the I-beam section, close to at least one end thereof, to enable the I-beam to be butt-jointed to a transversely extending rim-joist by means of bolts which in use extend through the rim-joist for threaded engagement in the cross-dowels in the I-beam joist.
  • the invention also lies in a cross-dowel adapted to be secured in a laminated flange of a timber I-beam joist, wherein the dowel is generally cylindrical in configuration and is formed an external screw thread profile the external diameter of which increases from the end of the dowel which is to be first introduced into the hole in the laminated flange, towards the other end thereof, and the said other end includes a screwdriver slot or other tool engaging means, to enable it to be screwed into the hole in the laminated flange of the I-beam joist.
  • the screw thread may be of the self-tapping variety.
  • the invention also lies in a cross-dowel adapted to be secured in a laminated flange of a timber I-beam joist, wherein the external surface of the dowel is formed with at least one annular barb, and preferably a plurality of such annular barbs, in the form of a fir tree, the external diameter of the barbs increasing from the end which is first intruded into the hole in the laminations, towards the other end thereof, whereby in use the dowel may be secured in the laminated rail by introducing the barbed end into a pre-formed hole in the laminated flange and driving the dowel into the hole using a hammer or mallet or a power driver.
  • the end of the dowel which is visible even after it has been driven into the flange of the I-beam joist, is formed with a screwdriver slot or other means whereby it can be rotated whilst embedded in the flange, to enable the transverse threaded opening therein to be aligned to receive a rim-joist securing bolt.
  • a roof or flooring panel constructed in accordance with the invention is less susceptible to distortion damage during handling, storage and/or shipment, than are similar flooring panels when constructed using conventional cross-nailing techniques.
  • a cross-dowel connection may be formed between the end of one rim-joist and an abutting face of an adjoining rim-joist at a corner of a roof or flooring panel embodying the invention.
  • the invention thus allows timber I-beams to be constructed into larger building sections.
  • beams and sheeting can be made up into larger prefabricated floor decks or roofing panels and delivered to site for lifting into position by crane.
  • the invention provides a solution to these problems for use at the junction of I-beams with supporting rimboards or rim-joists and for the first time it is now possible to industrialise the assembly process of roofing and flooring decks etc.
  • a timber I-beam joist 10 is shown formed from a relatively thin vertical web of timber/timber composite material 12, the upper and lower longer edges of which are adhesively bonded into routed grooves in the upper and lower flanges or rails 14, 16 each of which is formed by laminating a larger number of thin strips of timber, the laminations running parallel to the length dimension of the beam (as shown) and the stack being orientated generally at right angles to the web 12.
  • the laminations are denoted by reference numeral 18 in the case of the upper flange 14 and by 20 in the case of the lower rail 16.
  • the end of the beam is cut square so that the cut ends 22, 24 of the upper and lower rails occupy the same plane as does the cut end 26 of the web 12.
  • a timber rim joist 28 is to be butt-joined to the end faces 22, 24, 26 of the I-beam joist 10.
  • holes are formed in the upper and lower rails (only the upper one 30 being visible in Fig 1) and cross-dowels such as 32, 33 are located in each of the two holes, with a threaded transverse openings 34, 35 in the dowels aligned with orthogonal holes 36 and 38 which intersect the holes in the upper and lower flanges.
  • the joint is completed by inserting two threaded bolts 40, 42 through two pre-drilled holes 44, 46 in the rim-joist 38, so as to enter and pass through the holes 36 and 38 respectively, to engage in the threaded transverse openings (such as 34 in the case of dowel 32) in the dowels. Tightening the bolts into the dowels draws the rim-joist into a tight fit on the ends 22, 24, 26 of the I-beam joist 10.
  • FIG. 48 A typical cross-dowel cast and machined from metal, is shown at 48 in Fig 2.
  • Figs 3 and 4 show in cross section how the bolt 42 and dowel 33 fit into the orthogonal holes 38 and39 respectively.
  • Both holes 38 and 38 are conveniently formed by drilling and both are drilled beyond the region in which the two holes intersect, so as to accommodate the driven ends of the dowel and bolt respectively.
  • the head of the bolt may be more like a flat nail head, to reduce the need for undercutting the hole 38.
  • a screwdriver slot (which may to advantage be a crossed slot to receive a cross-headed screwdriver) is formed in the end face of the head of the bolt.
  • the dowel may be tapered and/or formed with annular rims to create a barbed or firtree connection with the timber joist.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Floor Finish (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Roof Covering Using Slabs Or Stiff Sheets (AREA)
EP02251738A 2001-04-21 2002-03-12 Zusammengesetzte Holztragstruktur für Böden Withdrawn EP1251213A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0109966A GB2374643B (en) 2001-04-21 2001-04-21 Structural timber floor assembly
GB0109966 2001-04-21

Publications (2)

Publication Number Publication Date
EP1251213A2 true EP1251213A2 (de) 2002-10-23
EP1251213A3 EP1251213A3 (de) 2003-09-24

Family

ID=9913312

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02251738A Withdrawn EP1251213A3 (de) 2001-04-21 2002-03-12 Zusammengesetzte Holztragstruktur für Böden

Country Status (3)

Country Link
US (1) US20020152706A1 (de)
EP (1) EP1251213A3 (de)
GB (1) GB2374643B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2442959A (en) * 2006-10-20 2008-04-23 Mehdi Robert Teers Modular building construction
US9249574B2 (en) 2013-08-07 2016-02-02 Edmund MEI Structural engineered wood rim board for light frame construction
RU2766109C2 (ru) * 2020-05-04 2022-02-08 Кноп Евгений Данилович Сборная несущая конструкция перекрытия и способ ее образования

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB665974A (en) * 1948-12-24 1952-02-06 Remi Dirckx Improvements in or relating to jointing means
FR1081052A (fr) * 1953-07-09 1954-12-15 Vis à bois
GB961938A (en) * 1960-07-28 1964-06-24 Caromic And Company Ltd Improvements in building structures

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE625555A (de) * 1962-11-30
GB1524061A (en) * 1976-01-05 1978-09-06 Parker & Co High Wycombe Ltd A Knock-down chair
DE2842781A1 (de) * 1978-09-30 1980-04-10 Helmut Schmidtmann Tuer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB665974A (en) * 1948-12-24 1952-02-06 Remi Dirckx Improvements in or relating to jointing means
FR1081052A (fr) * 1953-07-09 1954-12-15 Vis à bois
GB961938A (en) * 1960-07-28 1964-06-24 Caromic And Company Ltd Improvements in building structures

Also Published As

Publication number Publication date
GB2374643A (en) 2002-10-23
US20020152706A1 (en) 2002-10-24
EP1251213A3 (de) 2003-09-24
GB2374643B (en) 2003-03-26
GB0109966D0 (en) 2001-06-13

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