Kielsteg wooden construction element
The Kielsteg wooden construction element is a flat component made of wood for use as a load-bearing roof and ceiling construction element for lightweight wood constructions . With Kielsteg wooden construction elements , spans of up to 27 meters can be built over without supports.
Design
Kielsteg construction elements are unblocked, light and high load-bearing, uniaxially tensioned surface support systems made of wood. They consist of a top and bottom chord made of sawn timber and bars made of plywood or OSB . The characteristic curvature of the webs in the form of a boat keel gives the component its name. Primarily keel catwalk components are large in structures span the roof and ceiling supporting structure for use. Just as with hollow body ceiling elements made of concrete or lattice girders made of steel, material is used specifically for the Kielsteg elements where it is statically necessary. The Kielsteg technology is a patented process, the inventor of the system is the Austrian Stefan Krestel.
raw materials
Kielsteg is a composite system with a combined cross-sectional structure made of panel materials and sawn timber.
Spruce wood
plywood
OSB3
Spruce wood: Finger-jointed spruce wood of strength class C24 is used for the tensile and compression stressed component areas.
Plywood: Bars made of three-layer 4 mm spruce and pine plywood form the inner framework for the elements with a construction height of 228 mm to 380 mm.
OSB: OSB3 panels with a thickness of 8 mm, 10 mm and 12 mm form the inner framework for the elements with a construction height of 485 mm to 800 mm.
Fields of application
Large spans and overhanging roof structures
Due to their cellular construction with plate webs and spruce wood belts in the pressure and tension zone, Kielsteg elements have a large load-bearing capacity in relation to their own weight, which enables their use in particular in the planning and construction of halls, commercial and industrial buildings. Structures of this type are usually subject to a column spacing of five to six meters and load-bearing primary girders. With Kielsteg construction elements, the column grid can be enlarged considerably, which enables a high degree of flexibility in the use of the building. With Kielsteg elements, building spans of up to 27 meters can be built over and this as a surface-forming, stiffening and load-bearing structure. Cantilever roof constructions can also be realized with up to 10 m depending on the load case and requirements.
surface
The surface is planed and natural and does not require any additional formal or fire-technical cladding when used as a floor ceiling or as a roof element. The elements are manufactured in the surface qualities of visual and industrial quality based on ÖNORM B2215: 2009 table A4.
Statics
Due to their cross-sectional shape, Kielsteg components are suitable as bending beams for wide-span roof structures. The belt zones made of finger-jointed solid wood cross-sections of strength class C24 allow large bending stresses in the longitudinal direction of the fibers . The comparatively slim webs made of three-layer plywood or OSB panels serve to transmit shear forces and enable the component height to be easily adapted to the given load and span situation in a material-optimized manner. The ideal areas of application for Kielsteg building elements are flat roofs and storey ceilings with evenly distributed loads. The dimensioning for bending loads is based on EN 1995-1-1 point 9, "Bending bars with narrow webs". The verification procedure is regulated in the general building inspection approval z-9.1-831.
The following graphic gives an overview of the static performance spectrum of Kielsteg construction elements.
Fire protection
If dimensioned accordingly, Kielsteg construction elements do not require any additional measures such as cladding or the like on the visible side for the fire resistance period REI 30 and REI 60. Due to the cell structure with upper and lower solid wood belt layers, only the burn-off of the belt layer facing the fire has to be taken into account when measuring the fire resistance period and the residual load-bearing capacity. The joint formation at the connection point between two elements has been tested and meets the requirements for the required fire resistance duration REI 30 and REI 60.
Technical specifications
| use | Floor slabs and roof structures |
| Construction | Cell construction with upper and lower belt
Spruce and a middle bar made of plywood or OSB |
| Wood species | Spruce |
| surface | Visual and industrial quality, planed and natural |
| Dimensions | Element width: 1,200 mm, installation width: 1,165 mm |
| Strength | From 228 mm to 800 mm |
| length | 5.00 m to 27.00 m |
| Fire resistance period | Fire-retardant REI 30, applies as standard for all keel bridge types, highly fire-retardant REI 60 is possible |
| Long edge | Profiled with connecting fold |
| Use class | Use class 1 and use class 2 |
| Bonding | MUF adhesive of emission class E1 |
| Wood moisture | Installation moisture of the elements 12% ± 3% |
| Shape change | In the longitudinal direction of the element 0.01% per% change in wood moisture content
In element width 0.25% per% change in wood moisture content Negligible in element thickness |
Manufacturing
The components can be manufactured in thicknesses of 228 mm to 800 mm and in lengths of up to 27 meters - either straight or with a camber along their main clamping direction. With the manufacture of raised elements, the requirements of the limit state of usability for roof and ceiling structures with large spans are met.
The production includes the manufacturing steps of wood sorting, finger jointing, planing, glue application, joining of belts and webs as well as the final pressing of all parts. External monitoring of production is carried out by the materials testing institute of the University of Stuttgart.
Certificates
General building approval
Kielsteg has general building inspection approval in Germany. The material tests for approval were carried out by the MPA Stuttgart Otto Graf Institute. The building authority approval was carried out by the German Institute for Structural Engineering in Berlin and issued in April 2013.
PEFC
The technology is marked with the PEFC - Program for the Endorsement of Forest Certification . The certificate distinguishes wood and paper products that are proven to come from ecological, economic and socially sustainable forest management along the entire processing chain. The "Program for the Endorsement of Forest Certification" serves as a confirmation for customers that the purchase of a PEFC-labeled product guarantees and supports environmentally friendly forest management.
Prizes and awards
- Fast Forward Award 2008
- Schweighofer Prize 2013: Innovation prize for the European forest and wood industry
- Inventum 2014: Awarded by the Austrian Patent Office as the best patent of 2013
- materialPREIS 2015: 1st prize from the raumPROBE materials agency for the largest hall to date with a Kielsteg roof
See also
Web links
- Kielsteg: glued high-performance components made of wood , Andreas Trummer, Institute for Structural Design of TU Graz and Stefan Krestel Kielsteg GmbH, 20th International Timber Construction Forum IHF 2014 in Garmisch-Partenkirchen , available as PDF (accessed July 30, 2016)
- "Bauwerke 2005 - 2015", reference book 2016, publisher Kielsteg GmbH Graz January 2016 , available as PDF (accessed July 31, 2016)
Individual evidence
- ↑ Pre-fabricated wooden components for wide-span roof structures . In: industrial construction . May 2015, p. 28 ( kielsteg.de [PDF]).
- ↑ Light and wide . In: Holzkurier . No. 36 , September 4, 2014, p. 34 ( demmelhuber.de [PDF]).
- ↑ Innovation in ceiling construction as a program . In: Alt-Neuöttinger Anzeiger . No. 252 , November 1, 2014 ( kielsteg.de [PDF]).
- ↑ Patent EP1841930 : Support-type component that is composed of individual sections and method and device for producing said component. Applicant: Stefan Krestel, inventor: Stefan Krestel.
- ↑ ms: Wood creates space . In: SCOPE . February 2015, p. 48, 49 ( kielsteg.de [PDF]).
- ↑ Karin Kronthaler: Reduced use of materials . In: industrieBAU . No. 1/16 , January 2016, p. 34 ( kielsteg.de [PDF]).
- ↑ Karin A. Lehner-Illetschko: Area can be used flexibly . In: Holz-Zentralblatt . No. 4 , January 23, 2015, p. 89 ( kielsteg.de [PDF]).
- ↑ Materials testing institute of the University of Stuttgart: Development of new lightweight wood construction elements "Kielsteg". April 1, 2012, accessed July 27, 2016 .
- ^ Prize winners 2013. Accessed on July 29, 2016 .
- ↑ The Austrian Patent Office: And the INVENTUM goes to Kielsteg! (No longer available online.) The Austrian Patent Office, archived from the original on July 21, 2016 ; accessed on July 27, 2016 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Room sample: 1st award: workshop and manufacturing center. (No longer available online.) Archived from the original on July 21, 2016 ; accessed on July 27, 2016 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ hw / ny: award for Kiel ridge roof at B + D . In: Alt-Neuöttinger Anzeiger . No. 277 , November 28, 2015, p. 27 ( kielsteg.de [PDF]).
