Artikeldatenbank
Autor(en) | Titel | Zeitschrift | Ausgabe | Seite | Rubrik |
---|---|---|---|---|---|
Thünen-Institut Bremerhaven: Mit strahlungsarmem Beton gebaut | Beton- und Stahlbetonbau | 6/2016 | 365 | Aktuelles | |
Clasßen, Martin; Felber, Lukas; Herbrand, Martin; Kueres, Dominik; Hegger, Josef | Längsschubtragfähigkeit von kleinskaligen Pin-Verbundmitteln - Numerische Analyse und Handrechenmodell | Beton- und Stahlbetonbau | 6/2016 | 366-376 | Fachthemen |
KurzfassungIn Verbundkonstruktionen ermöglicht die Verwendung hochfester Betone eine deutliche Reduzierung der erforderlichen Betongurtabmessungen. Für bestimmte Anwendungsgebiete kann hierdurch die Dicke der Betondeckschichten auf unter 30 mm verkleinert werden. Für derartig schlanke Betongurte von Verbundbauteilen ist allerdings die Anwendbarkeit herkömmlicher Verbundmittel, wie z. B. Kopfbolzendübel, nicht mehr gegeben. Die systematische Verbindung der Teilquerschnitte aus Beton und Stahl erfordert neuartige, kleinskalige Verbundmittel, die die Übertragung der Längsschubkräfte in der Verbundfuge sicherstellen. Ein neuartiges Schweißverfahren mit gezieltem Drahtvorschub und -rückzug ermöglicht die Herstellung von auf Stahlbleche und -träger geschweißten kleinskaligen Pin-Verbundmitteln mit ausgeformtem Kugelkopf und kegelförmigem Fuß. Das Längsschubtragverhalten dieser kleinskaligen Pin-Verbundmittel ist allerdings bisher noch nicht geklärt. Im vorliegenden Beitrag werden daher die Tragmechanismen dieser neuartigen Verbundmittel anhand numerischer Simulationen untersucht. Hierzu werden nicht-lineare Finite-Elemente-Modelle von Pin-Verbundmitteln im hochfesten Beton in der Finite-Elemente-Umgebung ABAQUS entwickelt, an Schubversuchen validiert und zur Ableitung von Bemessungsregeln herangezogen. Der Beitrag dokumentiert die systematisch aufeinander aufbauenden Parameterstudien und führt die schrittweise Entwicklung eines vollständigen Handrechenmodells zur Bestimmung der Längsschubtragfähigkeit von kleinskaligen Pin-Verbundmitteln einschließlich aller erforderlichen Anwendungsrandbedingungen vor. x | |||||
Schulze, Joachim; Breit, Wolfgang | Experimentalgebäude aus Infraleichtbeton - monolithisch und hochwärmedämmend | Beton- und Stahlbetonbau | 6/2016 | 377-384 | Fachthemen |
KurzfassungDie Kombination der physikalischen Eigenschaften eines hochwärmedämmenden Leichtbetons mit den optischen Eigenschaften eines modernen Architekturbetons ermöglicht Bauwerke, bei denen der Ausdruck des Baustoffs Beton mit den energetischen Anforderungen an Außenbauteile vereint werden kann. Ziel des an der Technischen Universität Kaiserslautern durchgeführten Forschungsvorhabens war die Entwicklung eines hochwärmedämmenden Leichtbetons für monolithische Außenbauteile mit Sichtbetonqualität. Der unter Nachhaltigkeitsgesichtspunkten entwickelte Infraleichtbeton aus rezykliertem Blähglas und portlandzementklinkerarmem Hochofenzement konnte die hohen Anforderungen hinsichtlich Rohdichte, Dauerhaftigkeit und Wärmeleitfähigkeit erfüllen. Der selbstverdichtende Leichtbeton musste widersprüchliche Anforderungen, wie z. B. ausreichende Druckfestigkeit bei geringer Rohdichte sowie geringe Wasseraufnahme trotz aufgeschäumter Zementmatrix, erfüllen. Die selbstverdichtenden Fließeigenschaften ohne Entmischung wurden durch den Einsatz eines PCE-Fließmittels in Kombination mit einem Stabilisator erreicht. Der durch Schaumbildner aufgeschäumten Zementmatrix wurden zur Verbesserung der Dauerhaftigkeit schwindreduzierende und hydrophobierende Zusatzmittel zugegeben. Bei Trockenrohdichten deutlich unter 700 kg/m³ wurde ein Wärmeleitfähigkeitswert von &lgr; = 0,15 W/(m·K) erreicht. Die Übertragbarkeit der im Labormaßstab gewonnenen Erkenntnisse auf Bauwerksverhältnisse wurde durch den Bau eines Experimentalgebäudes aus Infraleichtbeton auf dem Gelände der Technischen Universität Kaiserslautern überprüft. Kontinuierliche Messungen mit eingebauten Multiringsensorelektroden (MRSE) geben Aufschluss über Temperatur- und Feuchtigkeitsverläufe, um eine abschließende Aussage über die Eigenschaften des Infraleichtbetons bei natürlicher Bewetterung treffen zu können. x | |||||
May, Roland | Von Biebrich in die ganze Welt - Zur Verbreitung des Zeiss-Dywidag-Schalenbaus bis zum Ende des Zweiten Weltkriegs | Beton- und Stahlbetonbau | 6/2016 | 385-396 | Berichte |
KurzfassungDer Zeiss-Dywidag-Schalenbau zählt zum Standardrepertoire der internationalen Ingenieurhistoriografie. Seine fundamentale Bedeutung für die weltweite Verbreitung des Betonschalenbaus wurde bislang aber nur unzulänglich aufgearbeitet. Der folgende Beitrag unternimmt einen ersten Versuch der Nachzeichnung des enormen Wissenstransfers, der mit der internationalen Verbreitung dieser Bauweise über vier Kontinente sowie der ihr zugrundeliegenden Theorien einherging. x | |||||
Betonkugeln im Bodensee sollen Windstrom speichern | Beton- und Stahlbetonbau | 6/2016 | 396 | Aktuelles | |
Beton- und Stahlbetonbau aktuell 6/2016 | Beton- und Stahlbetonbau | 6/2016 | 397-403 | Beton- und Stahlbetonbau aktuell | |
Kurzfassung
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Berichtigung zu: Mindestbewehrung zur Begrenzung der Rissbreite unter Berücksichtigung des tatsächlichen Bauteilverhaltens, Teil 2 | Beton- und Stahlbetonbau | 6/2016 | 404 | Berichtigungen | |
Berichtigung zu: Mindestbewehrung zur Begrenzung der Rissbreite unter Berücksichtigung des tatsächlichen Bauteilverhaltens, Teil 1 | Beton- und Stahlbetonbau | 6/2016 | 404 | Berichtigungen | |
Kongresse - Symposien - Seminare - Messen | Beton- und Stahlbetonbau | 6/2016 | 405-406 | Veranstaltungskalender | |
Content: Geomechanics and Tunnelling 6/2016 | Geomechanics and Tunnelling | 6/2016 | Content | ||
Galler, Robert | 10th Austrian Tunnel Day / 10. Österreichischer Tunneltag | Geomechanics and Tunnelling | 6/2016 | 602 | Editorial |
News: Geomechanics and Tunnelling 6/2016 | Geomechanics and Tunnelling | 6/2016 | 604-615 | News | |
KurzfassungStart of construction on the largest contract of the Brenner Base Tunnel / Baubeginn beim größten Baulos des Brenner Basistunnels x | |||||
Schmidt, Claudia | Infrastructure - Lifeline of a modern society / Infrastruktur - Lebensader einer modernen Gesellschaft - Opening speech at the Austrian Tunnel Day 2016 / Eröffnungsrede zum Österreichischen Tunneltag 2016 | Geomechanics and Tunnelling | 6/2016 | 619-624 | Topics |
Rath, Andreas; Osthoff, Günter | Restructuring of the Stuttgart Rail Node - Successes and challenges through the example of the Ober- and Untertürkheim Tunnels / Neuordnung Bahnknoten Stuttgart - Erfolge und Herausforderungen am Beispiel der Tunnel nach Ober- und Untertürkheim | Geomechanics and Tunnelling | 6/2016 | 625-635 | Topics |
KurzfassungThe tunnels to Obertürkheim and Untertürkheim, part of the restructuring of the Stuttgart rail node, run completely through the built-up valley of Stuttgart and are being excavated with excavator and blasting. The article describes the possibilities and limits of blasting technology under the given local conditions. For the sections passing below residential areas, various methods of modern detonation and blasting technology have been tried and used in order to reduce the emissions of noise and vibration to the minimum possible. At the same time it was also necessary to minimise the loosening of the gypsum Keuper rock mass. The tunnels will be the first underground crossing of the River Neckar in Stuttgart. A section 500 m long will pass beneath the bed of the Neckar and its former courses in the current harbour area, with cover between only 8 m and 20 m. The branch structures that separate the tunnels to Ober- and Untertürkheim are also in this section, with the Neckar being crossed by altogether four individual tunnels at two levels. The prevailing geological conditions permitted an optimisation of the excavation of the branch structures without the originally intended pillar tunnel, which also reduced the construction time influence of this tunnel section. x | |||||
Gütter, Wolfgang; Rudigier, Günther | Tunnelling in Crete - A challenging task from a variety of aspects | Geomechanics and Tunnelling | 6/2016 | 636-646 | Topics |
KurzfassungIn 2012 the Greek State awarded Intrakat the Aposelemis Tunnel, an approx. 3.5 km long, tunnel inclined at 15% accommodating a 1.8 m diameter steel pipe to convey water from the Lassithi Plateau to the reservoir impounded by the Aposelemis dam about 600 m below for the drinking water supply of Heraklion and Agios Nikolaos in Crete. The project is regarded as an environmental project and as such is being financed from the Cohesion Fund of the European Commission. Unexpectedly, this relatively small tunnel project has offered a wide spectrum of tunnelling problems and turns out to be a challenging task from a variety of aspects: the tender and the contractual situation, technical and the meanwhile encountered geological challenges. On top of these, the economic crisis in Greece doesn't make such a project easy. Since October 2013, Jäger Bau GmbH has mastered these challenges together with Intrakat on the basis of a service contract. The TBM excavation works commenced in March 2015 and were expected to be completed within 11 months at the latest, but due to various unforeseen adverse geological occurrences, only two-thirds of the tunnel length had been excavated by August 2016. x | |||||
Stärk, Alfred; Falkner, Leo; Hill, Nigel | Logistic challenges and special geotechnical features in inner-city tunnelling through the example of Crossrail Contract C510 in London / Logistische Herausforderungen und geotechnische Besonderheiten im innerstädtischen Tunnelbau am Beispiel des Bauloses Crossrail C510 in London | Geomechanics and Tunnelling | 6/2016 | 647-658 | Topics |
KurzfassungUsing the example of Crossrail contract C510, the logistic challenges of inner-city tunnelling are considered in the first part of the article. Noise and dust protection measures and restricted working times have to be observed out of consideration for the local inhabitants. Supply to the site is subject to strict rules. The routes to and from the site are precisely specified, and the number of trucks underway at the same time is limited. The road safety equipment of the trucks, without which these cannot be used, is precisely specified. x | |||||
Ehrbar, Heinz | Building Information Modelling - A new tool for the successful implementation of major projects of German railways / Building Information Modelling - Ein neues Werkzeug zur erfolgreichen Realisierung von Großprojekten der Deutschen Bahn | Geomechanics and Tunnelling | 6/2016 | 659-673 | Topics |
KurzfassungIf correctly applied, digitalisation can also create great added value for railways, which explains why German Railways (DB) is taking it seriously. As with many other construction client organisations, the DB with their portfolio of major projects was and is confronted with the situation that cost targets and deadlines can often not be maintained. The causes for such deviations are various and in addition to the many external reasons, are also due to the current methods of controlling construction projects. The DB has recognised that the use of digital methods of project implementation such as Building Information Modelling (BIM) can achieve a great contribution to the improvement of project stability. While DB has already consistently furthered the use of BIM for station buildings in recent years, BIM has only been in use on DB infrastructure projects since 2015. By the end of 2020, however, the running up process of BIM at DB should have reached the stage that all complex major projects and all projects suitable for standardisation are designed and controlled with BIM. The DB hopes to gain from the use of BIM more transparency on projects, considerable economic benefits and the strengthening of the collaboration of all sides as partners. x | |||||
Daller, Josef; Zibert, Marko; Exinger, Christoph; Lah, Martin | Implementation of BIM in the tunnel design - Engineering consultant's aspect | Geomechanics and Tunnelling | 6/2016 | 674-683 | Topics |
KurzfassungThe importance of information management was recognised in surface construction industry decades ago, and is increasingly being recognised through formal processes and laws. Around the world, these laws and codes of practice are currently being drafted and enacted, to reflect the development of software tools and corresponding increasing adoption by industry. This paper deals with general overview of BIM and its benefits as well as specifics of implementing information modelling in the tunnelling business utilizing BIM (Building Information Modelling) technology developed for buildings as well as similar technology developed for the mining industry. Although BIM was initially recognised as a 3D digital representation of physical and functional characteristics of a facility, the benefits of using it are much wider than anticipated by its definition. This paper focuses on aspect of consultants and the role of other parties in developing projects. x | |||||
Mayer, Peter-Michael; Frodl, Stephan; Hegemann, Felix | BIM as a process in tunnelling / BIM als Prozess im Tunnelbau | Geomechanics and Tunnelling | 6/2016 | 684-695 | Topics |
KurzfassungIn this article, digitally supported processes for project development in tunnelling are described, supported on the one hand by a digital structure model from the design phase and on the other hand by an interactive process platform during the construction phase. Pricing and material quantity data from tendering and construction are part of the process chain. The connectivity of different BIM models and the associated interfaces represent an important but also challenging part of the closed solution. A BIM viewer is used as a bridge solution for data exchange between the IT systems used. Examples and solution approaches for 3D modelling in tunnelling and their networking with the information system IRIS are described. This article describes a multi-unit process system, which is being continuously developed and contains all relevant building blocks of the BIM process in the field of infrastructure. x | |||||
Herdina, Johann | Value Engineering - Presentation of the new bulletin of the FSV / Value Engineering - Vorstellung des neuen Merkblatts der Forschungsgesellschaft Straße und Verkehr (FSV) | Geomechanics and Tunnelling | 6/2016 | 696-701 | Topics |
KurzfassungThe term “Value Engineeering” was introduced into Austrian construction contracts in 2006 with the issue of the standard ÖNORM B 2118. The first attempts to implement value engineering proposals in practice met with considerable difficulties and led to long discussions on various sites. Representatives of client organisations and contractors together with representatives of universities and expert lawyers already tried to produce a generally acceptable regulation in 2009. This first attempt failed and only the present FSV bulletin has succeeded in laying down a common viewpoint. x | |||||
Lorenz, Stefan | Durability of double shell tunnels focusing on sheet membranes / Dauerhaftigkeit von zweischaligen Tunnelbauwerken mit dem Fokus auf die Kunststoffabdichtung | Geomechanics and Tunnelling | 6/2016 | 702-714 | Topics |
KurzfassungTests were performed on lining materials, which enable conclusions about the long-term stability of tunnels. For this purpose, laboratory tests were carried out on lining elements, which had been in use in existing tunnels for 20 to 40 years. To examine the effective forces and load transfer between tunnel lining layers, experiments were performed with sheet membranes in combination with shotcrete and in-situ concrete. The investigations show the influence of the surface roughness of sprayed concrete on the sheet membrane and the shear behaviour of the waterproofing system. The sheet membrane shows various types of damage, like indentations and scratches to the surface. The tests reveal that the requirements of the valid guideline are sufficient for uniaxial loading, but combination with shear stresses could lead to damage to the sheet membrane. The results provide information about the bonding behaviour of double-layer tunnel constructions. x | |||||
Galler, Robert | Research@ZaB - Start of construction of the "ZaB - Zentrum am Berg" research and development, training and education centre / Research@ZaB - Baubeginn für das Forschungs- und Entwicklungs- sowie Trainings- und Schulungszentrum Zentrum am Berg | Geomechanics and Tunnelling | 6/2016 | 715-725 | Topics |
KurzfassungThe creation of sustainable infrastructure is increasingly being provided in underground facilities. In terms of construction and maintenance, this leads to greater challenges for construction, transport and energy-provider companies. This also applies for emergency services organisations as well as to ensure the safety for the users of the infrastructure. The project “Research@ZaB - Zentrum am Berg” will establish an underground facility for research and development, education and training purposes. On the one hand, the centre should meet the requirements of public institutions; on the other hand it represents a “development factory” for private companies as well as concerned universities. x | |||||
Research and Development: Geomechanics and Tunnelling 6/2016 | Geomechanics and Tunnelling | 6/2016 | 726-727 | Research and Development | |
Research and Development: Geomechanics and Tunnelling 6/2016 | Geomechanics and Tunnelling | 6/2016 | 728-732 | Product Information | |
KurzfassungErkat excavator cutter attachments for flexible use in mining and tunnelling / Erkat-Baggeranbaufräsen für vielseitige Einsätze im Berg- und Tunnelbau x | |||||
Diary of Events: Geomechanics and Tunnelling 6/2016 | Geomechanics and Tunnelling | 6/2016 | 733-734 | Diary of Events | |