Artikeldatenbank
Autor(en) | Titel | Zeitschrift | Ausgabe | Seite | Rubrik |
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Doppmann, Gregor; Burri, Monika; Wick, Raphael | Success story: Environmental monitoring during construction at Erstfeld-Amsteg / Erfolgsgeschichte Umweltbaubegleitung Erstfeld-Amsteg | Geomechanics and Tunnelling | 2/2016 | 146-157 | Topics |
KurzfassungThe provisions of the planning approval for the Gotthard Base Tunnel required more than 1, 000 environmental measures for the Amsteg and Erstfeld sections, arranged in 80 detail projects. The environmental aspect was also of great significance for the client. Therefore AlpTransit Gotthard AG provided sufficient resources to be able to implement the project successfully from the environmental point of view. The article is concentrated on selected aspects and explains their special features. The integration of environmental monitoring into the local construction supervision team; soil protection and cultivation; the problem of nitrite in the site wastewater; and dust and noise emissions are dealt with in detail, along with the ecological opportunities of a large construction site. A description of the usual conditions and measures affecting a tunnel site is intentionally omitted. x | |||||
Successful winter seminars on plastered façades without damages / Erfolgreiche Winterseminare zu schadenfreien Putzfassaden | Mauerwerk | 3/2016 | 253-254 | Veranstaltungen | |
Gerstner, Reinhold; Vigl, Alois; Jäger, Manfred; Wilfinger, Nicole | Suitability and selection of excavation methods for headrace tunnels of high head hydropower plants / Eignung und Auswahl von Vortriebsverfahren für Druckstollen von Hochdruck-Wasserkraftanlagen | Geomechanics and Tunnelling | 3/2019 | 199-211 | Topics |
KurzfassungIn the construction of high-pressure hydropower plants, the headrace is often the decisive cost component and determines the economic feasibility of the plant. For this reason, the selection and dimensioning of the most suitable tunnelling method is of fundamental importance. This starts with the determination of a suitable layout followed by a reliable geological prediction and covers the geotechnical interpretation and identification of geotechnical requirements. This is followed by the most accurate forecast of the performance of different excavation systems and risk assessments for each estimate. Finally, the development and comparison of different construction process scenarios is required to determine the most practical and safest combination of the most suitable excavation methods. Subsequently, these individual steps are explained and a comparison is drawn with experience gained in construction practice in the implementation of numerous headraces of high-pressure hydropower plants. x | |||||
Sulfataerosole als Klimaanlage? | Bauphysik | 5/1997 | 158 | Aktuelles | |
Benz, G. | Sulfitablauge als Basis für Betonverflüssiger. | Beton- und Stahlbetonbau | 12/1972 | 279-282 | |
KurzfassungSulfitlauge entsteht als Abfallprozess einer Reihe von industrieller Prozesse. Es werden die besonderen chemischen Eigenschaften von Sulfitlaugen beschrieben und ihre Eignung und Anforderungen als Betonverflüssiger im Zuge eines Forschungsvorhabens erläutert. x | |||||
Qian, Chunxiang; Nie, Yanfeng; Cao, Tianji | Sulphate attack-induced damage and micro-mechanical properties of concrete characterized by nano-indentation coupled with X-ray computed tomography | Structural Concrete | 1/2016 | 96-104 | Technical Papers |
KurzfassungSulphate attack is a serious problem for concrete in marine environments. Sulphate attack can change the composition and microstructure of concrete and eventually influence the mechanical and durability performance. In this paper, the heterogeneity and mechanical properties of concrete exposed to sulphate is investigated from the microscopic to the mesoscopic scale. X-ray computed tomography (XCT) and nano-indentation were adopted to define the defect zone and establish the relationship between interfacial transition zone (ITZ) and concrete matrix (mortar). The experiments were based on concrete and mortar specimens of different strengths. The results of XCT have nano-indentation indicate that the specimens had similar degrees of damage regionally and good correlation exists between the elastic moduli of the ITZ and the mortar. The concrete can be partitioned into three parts: the cracked zone with heavy damage, damaged zone and undamaged zone. The elastic modulus of the mortar phase and the ITZ has a linear relation. x | |||||
Steiner, Walter | Sulphate-bearing rocks in tunnels - Lessons from field observations and in-situ swelling pressures / Verhalten von Sulfatgestein im Tunnelbau - Erfahrungen aus Feldbeobachtungen und In-situ-Quelldrücke | Geomechanics and Tunnelling | 3/2020 | 286-301 | Topics |
KurzfassungTunnels and underground works in sulphate bearing rocks are very challenging. For more than a century experience has accumulated in Switzerland and southern Germany with difficult conditions during construction and operation, which show the difficult conditions with extreme, long lasting heave of the invert and extreme swelling pressures. The analyses of published experience over more than a century and recent personal experience led to the compilation of many pieces of a puzzle and to a better understanding of complex processes. The swelling processes in sulphate bearing rocks are triggered by the formation of flow path for water, the dissolution, concentration and precipitation of minerals. In particular Anhydrite is dissolved and the solution becomes saturated, until precipitation and crystallization of Gypsum starts. The applied construction methods play an important influence on the rock mechanics and geochemical processes and finally the magnitude of in-situ swelling pressures. The in-situ swelling pressure are still large, but substantially less than the swelling pressures from laboratory tests. Estimated swelling pressures will be indicated. x | |||||
Jodl, H. G. | Summary of the panel discussion "Fair Construction Process ? Low Construction Costs" / Resumee der Podiumsdiskussion "Faire Bauabwicklung - kostengünstiges Bauen" | Geomechanics and Tunnelling | 1/2009 | 115-116 | Topics |
SUN Microsystems gewinnt FM-Anwenderpreis 2002 | Bautechnik | 12/2002 | 887 | Nachrichten | |
Ewert, S. | Sundoya-Brücke, Norwegen | Bautechnik | 4/2004 | 307 | Berichte |
Hertz, Kristian; Castberg, Andreas; Christensen, Jacob | Super-light concrete decks for building floor slabs | Structural Concrete | 4/2014 | 522-529 | Technical Papers |
KurzfassungThis paper presents investigations carried out at the Technical University of Denmark (DTU) on a prototype series for a super-lightweight prestressed concrete deck element called the SL-Deck. x | |||||
Buchmann, F.-U. | Supermarkt Sainbury, London. | Stahlbau | 6/1990 | 187-188 | Berichte |
Schubert, Wulf; Blümel, Manfred; Staudacher, Robert; Brunnegger, Stefan | Support aspects of tunnels in fault zones / Aspekte des Ausbaus von Tunneln in Störungszonen | Geomechanics and Tunnelling | 4/2017 | 342-352 | Topics |
KurzfassungSpecial considerations are required for the support of tunnels in fault zones. On the one hand, standard support elements are not compatible with the imposed displacements. On the other hand, local shearing can cause damage to the lining already at rather small displacements magnitudes. Cracks in the lining frequently are observed, when the geometry of the tunnel changes, or at the intersection with cross passages. As strengthening of the lining in many cases cannot prevent damage, temporarily leaving an open gap in the primary lining. Implementing yielding elements into the lining is as well feasible, as economical increasingly replaces the traditional method of leaving open gaps. This results in a better utilization of the lining's capacity and a considerable reduction of displacements. As the lining with integrated yielding elements develops considerable thrust, a transfer of the loads via the construction joints is required. Thus, careful construction of those joints is essential. Another problem can be the bond between bolt, grout, and rock mass, as the bolts are installed, when the displacement rate is highest, and the strength of the grout still low. This paper deals only with phenomena caused by discontinuities and large displacements, and does not address other hazards, like flowing ground. x | |||||
Frodl, Stephan | Support structures for segments at the construction of cross passages in different soil conditions / Unterstützungskonstruktionen für Tübbinge beim Herstellen von Querschlägen in unterschiedlichen Baugrundverhältnissen | Geomechanics and Tunnelling | 1/2019 | 69-81 | Topics |
KurzfassungEmergency exits must be available at certain intervals in tunnels for safety reasons. For this purpose, cross passages are excavated to a second tunnel tube, to shafts with staircases or separate exit tunnels. For the excavation of these emergency exits in TBM drives with segmental lining, openings have to be provided in the segmental lining. This article outlines different systems to make openings in segmental linings. The choice of a suitable system depends on various constraints, e.g. the geometric dimensions of the tunnel tube and the cross passages or the prevailing soil conditions. In addition, the loadbearing capacity and serviceability is also very important. x | |||||
Supraleistung | Bauphysik | 2/1994 | 63 | Aktuelles | |
Lutz, Robert; Zizka, Zdenek; Röchter, Lars; Thewes, Markus | Surface settlements caused by mechanised tunnelling in hard rock with heterogeneous tunnel face conditions - Empirical and numerical calculations using the example of Boßler Tunnel / Oberflächensetzungen bei maschinellen Tunnelvortrieben im Festgestein bei heterogener Ortsbrust - Empirische und numerische Berechnungen am Beispiel des Boßlertunnels | Geomechanics and Tunnelling | 1/2021 | 89-104 | Topics |
KurzfassungAn empirical and a numerical calculation model were developed to predict the surface settlements due to EPB tunnelling in hard rock with heterogeneous face conditions. For this purpose, surface settlement and TBM driving data from Boßler Tunnel were considered. The TBM launching area characterised by a low overburden (z/D < 2) and a nature conservation area at surface was examined. The developed models were calibrated against the measured surface settlements of the first eastbound tube and were used to predict the surface settlements of the subsequent westbound tube. The prediction was then compared to the actual measured settlements during the excavation of the westbound tube. From this, findings for future settlement predictions in similar ground conditions were derived. It could be shown that both models are suitable for the application in the investigated subsoil conditions and can be used successfully in practice in different phases of the project development. x | |||||
Richter, Wolfgang; Zenz, Gerald; Schneider, Josef; Knoblauch, Helmut | Surge tanks for high head hydropower plants - Hydraulic layout - New developments / Wasserschlösser für Hochdruck-Wasserkraftanlagen - Hydraulische Auslegung - Neue Entwicklungen | Geomechanics and Tunnelling | 1/2015 | 60-73 | Topics |
KurzfassungHigh head hydropower plants can generate high electrical power at very short notice, or if equipped with pumps can also draw electricity from the distribution grid and store its energy very efficiently. In this way, hydropower plants can make an indispensable contribution to regulating the grid and the use of regenerative energy sources. Physically, this requires reservoirs at various altitudes connected through headraces. x | |||||
Sakai, Koji | Sustainability | Structural Concrete | 1/2011 | 3-4 | Editorials |
Sakai, Koji; Shibata, Toshio; Kasuga, Akio; Nakamura, Hikaru | Sustainability design of concrete structures | Structural Concrete | 6/2016 | 1114-1124 | Technical Papers |
KurzfassungConcrete has become the most used material on Earth over the 200 years following the invention of modern cement. The design concept has undergone a transition from the allowable-stress design method, limit-state design method, to the performance-based design method, in response to the evolution of materials, sophistication of experimental facilities, and advancement of computation skills. From the issues on resources and energy depletion, global warming, and resilience etc., it is necessary to create a new design framework taking into consideration the required performance beyond the conventional concept, in order to construct infrastructure and buildings in a more rational way. In other words, we should construct a design system that sets the continued existence of the diverse and rich global environment as its most important criterion of value. In this paper, we review the design and technology system developed in the past and discuss it based on the above-mentioned new viewpoint, while constructing and presenting a new design system for concrete structures, focusing mainly on the concept of sustainability, which is regarded as the most important factor in achieving conservation of Earth's rich resources as well as sound socio-economic activities of humankind in the future, and we examine its feasibility. x | |||||
Sakai, Koji | Sustainability in fib Model Code 2010 and its future perspective | Structural Concrete | 4/2013 | 301-308 | Technical Papers |
KurzfassungConsidering the depletion of resources and energy and the risks of climate change on a global scale, a thoughtless increase in the use of resources and energy in the construction sector is obviously unacceptable. The sector has until now constructed a system of technology focused on safety and comfort, with priority given to economic and social benefits. Such demands remain extremely important; however, in the future we ought to give additional consideration to the depletion of resources, energy consumption and other, ensuing environmental issues. This means that the sector needs to incorporate sustainability - including the environmental, economic and social aspects - into its systems of design and technology. The fib decided to incorporate a “concrete sustainability” concept in its new fib Model Code for Concrete Structures 2010. This paper explains sustainability as expressed in this code together with the background to it. In addition, the essence of sustainability with respect to future Model Codes is discussed. x | |||||
Maydl, Peter | Sustainability in infrastructure construction - on the transferability of assessment concepts for buildings to civil engineering works / Nachhaltigkeit im Infrastrukturbau - Zur Übertragbarkeit von Bewertungskonzepten für Gebäude auf den Tiefbau | Geomechanics and Tunnelling | 5/2014 | 577-592 | Topics |
KurzfassungThe trend to sustainable construction in the building sector has greatly increased in recent years. In certain segments of the market (e.g. office and retail properties), building certificates are essential marketing aids and are having an increasing effect on competition, with questions of energy efficiency and interior air quality being of particular significance. A comprehensive series of European standards is now available, which also include a harmonised assessment concept. In infrastructure construction, this development has mostly been reflected in the estimation of lifecycle costs, durability and maintenance costs in bridge building and the recycling of material excavated from tunnels. x | |||||
Sustainability meets architecture - DGNB award "Sustainable construction" / Nachhaltigkeit trifft Architektur - DGNB-Preis "Nachhaltiges Bauen" | Mauerwerk | 3/2015 | 186 | Wettbewerbe | |
Sustainable Building 2000 | Bautechnik | 9/1999 | 840 | Termine | |
Hartmann, Raik; Jäger, Wolfram | Sustainable building for the future: Contemporary clay masonry - Resource-saving building / Zukunft durch nachhaltiges Bauen: Moderner Lehmbau - Ressourcenschonendes Bauen | Mauerwerk | 2/2017 | 102-113 | Fachthemen |
KurzfassungClay as a building material has a long tradition in Europe, largely losing its importance with industrialisation. Since the 1980s, clay building activity has steadily increased. Standard guidelines (Lehmbau-Regeln) introduced in the 1990s, however, appear to be rather too cautious when examined in the light of current research findings on the load bearing capabilities of clay walls. Based on the evidence of historic clay buildings, on structural engineering calculations and building physics - the authors' research supports the assumption that masonry with modern unfired clay bricks has a much higher performance potential than previously assumed, which applies particularly to its sustainability. The biggest apprehension relates to the water-sensitivity of this building material with regard to structural soundness. This can be countered however with the appropriate construction principles. x | |||||
Graubner, Carl-Alexander; Förster, Valentin; Schmitt, Michael; Koob, Benjamin; Pohl, Sebastian | Sustainable building with masonry / Nachhaltiges Bauen mit Mauerwerk | Mauerwerk | 1/2016 | 32-48 | Fachthemen |
KurzfassungEcology, energy and sustainability are crucial socio-economic keywords, especially for the construction and real estate industry. In recent years, the masonry industry faced related sustainability issues intensively in order to keep its ability of operating in a market setting which is increasingly characterized by sustainability dogmata. Scientific analyses and studies on an objectified sustainability basis - such as established certification systems - show that masonry is absolutely competitive with all other market-relevant construction methods. Therefore, the first part of this paper deals with a sustainability assessment of buildings made of masonry as well as of other construction materials. x |