BAU 2021

•••2••• Branchennews Herausforderung für die Baubranche Die Temperaturen in der Atmosphä- re und den Ozeanen steigen stetig an. Haupttäter seit Beginn der In- dustrialisierung ist der Mensch bzw. dessen Emissionen von Treibhaus- gasen – so der aktuelle Stand der Wissenschaft laut der Munich Re. Naturkatastrophen wie Über- schwemmungen, Orkane, Gewitter oder Dürren werden das „Wetter“ der Zukunft bestimmen, außer es gelingt, die Erderwärmung auf deutlich unter 2°C gegenüber dem vorindustriellen globalen Tempera- turniveau zu begrenzen. Exakt die- ses Ziel wurde 2015 im Pariser Kli- maabkommen von den Vereinten Nationen festgeschrieben. Um die- ses Ziel zu erreichen, verändert sich die Baubranche stetig, so stehen nachhaltiges und energieeffizientes Bauen imVordergrund. Resources & recy- cling in building Walls made of building rubble, insu- lation from old trouser material and screw connections instead of weld- ed seams: things are happening on building sites as regards the “circu- lar” or “closed-loop” economy. Pilot projects and research initiatives are showing the diverse opportunities offered by recycling in building: fa- çade material, windows, wall and floor coverings and cables—all of them can be fitted in such a way that they can subsequently be com- pletely removed andmade available for re-use or recycling. Recovered metals, concrete, bricks, plaster and even clay can now be made into new building materials. Recycling is playing an evermore important role. Fertigbau peilt 25 Prozent Marktanteil an Seit Jahren wächst der Fertigbauan- teil in Deutschland. 2019 und 2020 war hierzulande mehr als jedes fünfte neu genehmigte Ein- und Zweifamilien- haus ein Fertighaus. Jetzt nimmt der Bundesverband Deutscher Fertigbau (BDF) die nächste Zielmarke ins Visier, wie BDF-Präsident Hans Volker Noller erklärt: „Bundesweit erobern Fertig- häuser Marktanteile, nicht nur im seit Jahrzehnten besonders erfolgreichen Süden und Südwesten der Bundesrepu- blik werden sie immer beliebter. Diese Entwicklung sowie der insgesamt gute Auftragsbestand stimmen uns positiv, bereits in den nächsten drei Jahren ei- ne bundesweite Fertigbauquote von 25 Prozent zu erreichen.“ In den vergangenen 20 Jahren verzeich- nete der Fertigbau einen stetigen An- stieg seinesMarktanteils an neu geneh- migten Ein- und Zweifamilienhäusern in Deutschland. raw materials or concrete with renew- able resources. The ceiling system module is intended to replace suspended ceilings in old buildings which have a low load-bear- ing capacity and provide poor sound- proofing. A team of researchers at the Fraunhofer WKI is currently developing small, prefabricated panels which are intended to significantly simplify renovation work that has previously been complex and expensive. With these modular wood or wood- concrete elements, a mosaic- type coffered ceiling is created, which should exhibit a load- bearing capacity comparable to that of reinforced concrete. The box structure and the push- in connections have a high inher- ent rigidity and can therefore be erected in a self-supporting manner. For the sandwich core, the wood foam previously developed at the Fraunhofer WKI is used, thereby simultaneously increasing thermal and sound insulation. In this way, pet- rochemical insulation materials such as PU or XPS foams can be replaced by renewable raw materials. The outer box is comprised of solid structural timber, with a ceiling and a floor both made from particle board. With the ceiling system module, the renovation and subsequent use of old buildings in times of housing shortage is pro- moted in an ecological way. In the fu- ture, these modules could also be im- plemented in industrial buildings or as wall modules. Using the example of a stand-up pad- dleboard currently being developed at the Fraunhofer WKI, the researchers will also be demonstrating during BAU ONLINE 2021 the cross-section of a lightweight-construction sandwich el- ement made from renewable raw ma- terials. For the core, balsa wood from disused wind-energy rotor blades is used - a sustainable solution for their high-quality recycling. The researchers at the Fraunhofer WKI are also developing an outer shell made from natural-fiber-reinforced bioplastics (bio NFRP). The focus is thereby being directed at the appli- cation of flax fibers, as these have advantageous mechanical properties and are cultivated in Europe. The substitution of the petrochemi- cal and mineral components in con- ventional paddleboards by renewable and, in some cases, also recycled raw materials results in high savings po- tentials in terms of both energy de- mand and finite resources. In the future, the new bio-compos- ite material could be utilized not only in other watersports equip- ment but also in the construc- tion of buildings, cars, ships and trains. With the two projects, the Fraunhofer WKI is supporting the development of a bio-based economy (bio-economy). Due to the corona pandemic, the annual BAU trade fair will take place from 13th to 15th January 2021 in the form of a digital plat- form for architecture, materials and systems. Live presentations, 1:1 talks with exhibitors and an extensive con- ference program will be offered. The Fraunhofer WKI will present itself as a member of the Fraunhofer Building In- novation Alliance with exhibits on the key topic of resources and recycling. Researchers from the Fraunhofer WKI will be available for an exchange. Fur- ther information can soon be found in Fraunhofer’s exhibitor profile on the BAU ONLINE website. Cross-section of the ceiling system mo- dule: An individual element (box) con- sists of solid structural timber (frame), particle board (ceiling and floor) and wood foam (core). Foto: Fraunhofer WKI | Steffen Sydow Fertighäuser werden bei Bauherren immer beliebter. Foto: BDF / GUSSEK HAUS Continued from Page 1 Die Baubranche nach Corona Wie verändert die Coronakrise die Architektur und Stadtplanung? Wie verändert die Krise die Bau- wirtschaft? Die Antworten auf diese Fragen führen zu einer ver- änderten Architektur- und Stadt- planung. Neue Ideen für Arbeits- orte, Versammlungsstätten und andere Gebäude verändern die Anforderungen an Planer, Ausfüh- rende und die Industrie. Mitt- woch, 13.01.2021, 10:00 bis 12:00 Uhr, www.bau-muenchen.com