Journal articles
Author(s) | Title | Journal | Issue | Page | Category |
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Balbi, Gianpiero | Maintenance of retaining structures on the Swiss motorways and national roads / Erhaltung von Stützbauwerken auf den schweizerischen Nationalstraßen | Geomechanics and Tunnelling | 5/2019 | 523-533 | Topics |
AbstractThe Swiss motorways and national roads are being completely modernised in maintenance sections. All structures are regularly checked according to national and Fedro standards and maintenance measures are implemented where necessary. Completed maintenance projects concerning retaining structures have shown that the danger of corrosion cannot be neglected. In order to ensure the availability of the network in the long term, several retaining structures have been preventatively strengthened, including with the aid of risk-based approaches. For this purpose, five research projects have been initiated. The procedure of Fedro for the maintenance of retaining structures is presented through examples from project studies. x | |||||
Stern, Jürgen; Schuch, Markus | 1850 to 2019 - Experience with retaining structures at the ÖBB Infrastruktur AG / 1850 bis 2019 - Erfahrungen mit Stützbauwerken bei der ÖBB Infrastruktur AG | Geomechanics and Tunnelling | 5/2019 | 534-539 | Topics |
AbstractThe many years of experience with retaining structures at the ÖBB-Infrastruktur AG show that, independent of their structural loading, stone or mass concrete gravity walls, which have been in use since the railways were built, have the least expense for maintenance. Even structures built up to 160 years ago require little maintenance work, e.g. removal of plant growth. With anchored retaining structures of concrete, on the other hand, the maintenance work is considerably greater. This starts with regular inspection and extends to extensive repairs to the anchor heads. x | |||||
Sönser, Sabrina; Treichl, Hanspeter; Leitner, Andreas | Anchored retaining walls from the early 1980s in the Salzburg area / Geankerte Stützkonstruktionen aus den frühen 1980er-Jahren im Raum Salzburg | Geomechanics and Tunnelling | 5/2019 | 540-547 | Topics |
AbstractAll retaining walls along highways have to be controlled and checked regularly. In the course of these checks, defects and a wide variety of failure mechanisms to anchors have been found throughout Austria over the past ten years. The following article discusses retaining walls with anchors of the type Permaflex in the area around Salzburg. Due to their construction, these have an increased susceptibility to corrosion. The two examples, a retaining wall at Egger and slope stabilisation of the Donnergraben bridge are in each case anchored, coupled plate elements made of reinforced concrete. In particular, the importance of both the installation of permanent monitoring as well as the availability of inventory documents in remediation planning is emphasized. x | |||||
Stadlbauer, Jakob; Antony, Christoph | Case study on the maintenance of various anchored retaining walls in the Austrian high-speed road network / Erfahrungsbericht über die Erhaltung diverser geankerter Stützkonstruktionen im hochrangigen Straßennetz | Geomechanics and Tunnelling | 5/2019 | 548-554 | Topics |
AbstractAnchored retaining structures demand detailed preliminary investigations for appropriate and economic repair and upgrading. However, due to the complex constraints and insufficient data basis, it is often necessary to investigate the basis for the design of repair works in advance. The article described two anchored constructions. The first is a bored pile wall to dowel a slope. In addition to the repair of corrosion damage to the strand anchors, repair of the uphill drainage system is an essential part of the refurbishment concept. The second example is a retaining structure about 40 years old, in which several rod anchors show corrosion to their heads. Since there is a lack of information about the ground conditions for the assessment of structural safety and design of repair works, additional investigation boreholes were drilled. x | |||||
Bergmeister, Konrad | The Brenner Base Tunnel - geological, construction and logistical challenges and innovations at half time / Der Brenner Basistunnel - geologische, bautechnische, logistische Herausforderungen und Innovationen zur Halbzeit | Geomechanics and Tunnelling | 5/2019 | 555-563 | Topics |
AbstractThe Brenner Base Tunnel with a total of 230 km of tunnels is a geological, structural and logistical challenge. The transnational project is an additional challenge, considering different planning, approval and construction rules and cultures. From the start of construction in 2007 to the present, today halftime is reached with 100 excavated tunnel kilometers. An overview of selected topics is given in this contribution, such as project optimizations of the emergency areas, geological/geotechnical knowledge transfer from the already driven exploratory tunnel to the following construction lots of the parallel main tunnels, reprocessing and use of Schists as aggregates for the inner lining and shotcrete production, logistics experience with wheel-bound transport vehicles, measurements during construction with laser tunnel scanners and the service life of the tunnel of 200 years with an increased safety concept defined in the guide conceptual design. Preparations and planning are already at an advanced state for the second half of the project, concerning the next excavation lots, secondary linings as well as interior work with the installation of the technical equipment. The construction work is expected to be completed in 2025 and the end of construction is expected at the end of 2028 (2030 in case of risk occurrence). x | |||||
Reinhold, Chris; Cordes, Tobias; Bergmeister, Konrad | Geotechnical rock mass characterisation and classification at the Brenner Base Tunnel project - Methodology and solutions / Geotechnische Klassifizierung und Charakterisierung des Gebirges beim Brenner Basistunnel - Methodik und Lösungsansätze | Geomechanics and Tunnelling | 5/2019 | 564-574 | Topics |
AbstractFor the construction of the Brenner Base Tunnel with a total length of the whole tunnel system of 230 km, the geotechnical characterisation of the rock and the rock mass based on the geological mapping, the exploration and the geological models is of essential importance. The reliability of the ground prediction and consequently the effectiveness of the construction and support measures are mainly influenced by the methodology for the evaluation of the characteristic material parameters of the ground. This mainly influences the project process and the construction as well as the maintenance costs of a tunnelling project. In this paper, the applied methodology with its approaches of resolution for the improvement of the reliability of the ground prediction at the Brenner Base Tunnel project are explained in detail. Furthermore the improvements to this methodology during different project stages are shown. The paper concentrates on the implementation of the results gained from the exploratory tunnel and the influence of these results on the methodology for the improvement of ground prediction and the reduction of ground risks. In addition problems and approaches for solving these problems are explained in detail. For instance the avoidance of the double consideration of the influence of schistosity by using a rock mass classification system for rock mass parameter identification. x | |||||
Flora, Matthias; Grüllich, Sebastian; Töchterle, Andreas; Schierl, Heimo | Brenner Base Tunnel exploratory tunnel Ahrental-Pfons - interaction between tunnel boring machine and rock mass as well as measures to manage fault zones / Brenner Basistunnel Erkundungsstollen Ahrental-Pfons - Interaktion zwischen Tunnelbohrmaschine und Gebirge sowie Maßnahmen zur Ereignisbewältigung in den Störzonen | Geomechanics and Tunnelling | 5/2019 | 575-585 | Topics |
AbstractApprox. 42 km of tunnel were excavated on the contract Tulfes-Pfons H33, including a 15 km long section of the exploratory tunnel, which has been excavated since October 2015 with a gripper TBM from the Ahrental access tunnel southward into the district of Steinach. The interaction of the tunnel boring machine with the rock mass is discussed here as a back analysis of the mechanized tunnelling drive. This article does compare the forecast with the actual geological/geotechnical conditions, but only considers the conditions actually encountered. The back analysis takes place analogously to the principle of geotechnical planning according to the ÖGG (Austrian Society of Geomechanics) guideline, in which, starting from the rock mass structure and the rock mass types, the encountered tunnel face and intrados behaviour are observed and an estimation of the system behaviour is carried out. A description of the tunnelling technology concept completes this paper together with two case studies and the lessons learned. x | |||||
Cordes, Tobias; Reinhold, Chris; Schneider-Muntau, Barbara; Grüllich, Sebastian; Himmelsbach, Christian; Wehrmeyer, Gerhard | Analyses of TBM disc cutter forces - application possibilities / Analyse der TBM-Diskenkräfte - Anwendungsmöglichkeiten | Geomechanics and Tunnelling | 5/2019 | 586-594 | Topics |
AbstractForecasts made during tunnelling of the daily advance, to control the machine, specify the lining and verify system behaviour are of great importance for safety and for the success of the whole project. In practice, such forecasts are obtained in deep tunnels by probe drilling, leading to downtime periods and by analog/digital face documentation with shorter downtime periods. Measurement and evaluation of rock mass cutting at the cutterhead of the TBM enables continuous monitoring without downtime. From the spatial distribution of the disc forces, basic geological/geotechnical information about the tunnel face can be derived. In addition, this data is valuable for load monitoring and monitoring the condition of the discs to determine the optimal changing time. This contribution deals with a geological-geotechnical interpretation of the disc forces of the open TBM on contract H33 Tulfes-Pfons of the Brenner Base Tunnel. The spatially distributed disc forces are evaluated and compared with the geological documentation. x | |||||
Lussu, Andrea; Grüllich, Sebastian; Kaiser, Christian; Fontana, Adrian | 15 km TBM exploratory tunnel excavation in the construction Lot H33 of the Brenner Base Tunnel / 15 km TBM Vortrieb im Los Tulfes Pfons - Erfahrungen und Erkenntnistransfer auf das Hauptbaulos | Geomechanics and Tunnelling | 5/2019 | 595-603 | Topics |
AbstractThe Tulfes Pfons H33 construction contract of the Brenner Base Tunnel includes a 15 km long exploratory tunnel. The tunnel is being driven by an open gripper TBM, permitting a view of the surface of the rock mass, to achieve the best possible geological and geotechnical exploration for the deep tunnel system. Geologists and geotechnical engineers follow the TBM excavation on a daily basis and guarantee ongoing mapping and interpretation of the rock mass classification and of the TBM data. All data from the exploratory tunnel advance, the TBM data, the measured deformations and the seismic explorations as well as the findings of geological mapping are incorporated into the geotechnical longitudinal section, which serves as the basis for the tenders of the main construction contracts. In particular, discussions take place with the designer of the following contract, how the encountered fault zones and overbreaks can be passed successfully in the main tunnels. Both the improvement of the rock mass from the exploratory tunnel and ramps are considered in order to excavate the most difficult fault zones from the exploratory tunnel. x | |||||
Forepoling systems for safe excavation of the Quarters Tunnel in Edmonton / Vorpfändmittel für sicheren Vortrieb im Quarters Tunnel in Edmonton | Geomechanics and Tunnelling | 5/2019 | 604-605 | Site Reports | |
Maintenance of the Kanaltunnel Rendsburg secured in the long Term / Erhaltung des Kanaltunnels Rendsburg langfristig gesichert | Geomechanics and Tunnelling | 5/2019 | 606-608 | Product Informations | |
Diary of Events: Geomechanics and Tunnelling 5/2019 | Geomechanics and Tunnelling | 5/2019 | 609-610 | Diary of Events | |
Geomechanics and Tunnelling 5/2019 | Geomechanics and Tunnelling | 5/2019 | 611 | Imprint | |
Titelbild: Mauerwerk 5/2019 | Mauerwerk | 5/2019 | Titelbild | ||
AbstractThe Cuevas del Pino estate sits in the foothills of Sierra Morena, in calcarenite stone terrain arranged in a slightly sloping strata that gives rise to various geological formations native to the area, among these are caves which resulted from quarrying that supplied Cordoba with stone during its most splendorous centuries. The architects have created a new spatial experience that manages to value the tectonic nature of the area through the use of new architectural elements. (Photo: David Vico) x | |||||
Inhalt: Mauerwerk 5/2019 | Mauerwerk | 5/2019 | Inhalt | ||
Jesse, Dirk | Changes and challenges / Veränderungen und Herausforderungen | Mauerwerk | 5/2019 | 283 | Editorial |
Förster, Valentin; Graubner, Carl-Alexander | Extended conditions of application of DIN EN 1996-3/NA for high walls / Erweiterung des Anwendungsbereichs von DIN EN 1996-3/NA für hohe Wände | Mauerwerk | 5/2019 | 284-299 | Fachthemen |
AbstractAccording to Eurocode 6, unreinforced masonry walls can be designed using different verification methods, whereby the simplified calculation methods are contained in Part 3 of DIN EN 1996 [1]. If the associated application limits and boundary conditions are fulfilled, a large part of the usual problems occurring in masonry construction can be dealt with without great effort. A limiting condition for the application of the simplified calculation methods is a maximum clear wall height of h = 2.75 m or h = 12 · t. Changes in user requirements for modern buildings with masonry walls nowadays often require greater wall heights, wherefore a verification according to the general rules from DIN EN 1996-1-1/NA [2] is necessary. This means a considerably higher effort for the structural engineer. x | |||||
Graubner, Carl-Alexander; Müller, Dominik | Simplified verification method for unreinforced masonry shear walls / Vereinfachter Nachweis von Aussteifungswänden aus unbewehrtem Mauerwerk | Mauerwerk | 5/2019 | 300-305 | Fachthemen |
AbstractAccording to the German National Annex to DIN EN 1996-3, a calculative verification of the bracing system may be omitted if, besides other requirements, an obviously sufficient number of sufficiently long shear walls is in place. If it is questionable whether a building complies with this requirement, a time-consuming verification of the bracing system according to DIN EN 1996-1-1/NA is unavoidable. This article therefore presents a simplified verification method for the bracing system, which will prospectively be included in the next revision of DIN EN 1996-3. The simplified bracing verification can already be used as a decision-making aid to omit the calculative bracing verification according to DIN EN 1996-1-1/NA. x | |||||
Graubner, Carl-Alexander; Purkert, Benjamin | Verification of the fire resistance of clay brick masonry - hints for efficient design / Nachweis des Feuerwiderstands von Ziegelmauerwerk - Tipps für eine effiziente Bemessung | Mauerwerk | 5/2019 | 306-315 | Fachthemen |
AbstractIn Germany, structural fire design of masonry is carried out in a simplified way using tabulated minimum wall thicknesses depending on the loading level in fire. Against this background the procedure of structural fire design is shown briefly before two approaches for a more efficient verification of the fire resistance are explained. The first possibility is to determine the reduction factor for the design value of the actions in fire more precisely and thereby reduce the loading level. Secondly, a design methodology is presented which can be applied in case of masonry walls with low vertical load but a large load eccentricity at mid-height of the wall. Finally, the verification of the fire resistance of masonry according to national technical approval is discussed with an explanation how to obtain the same loading level in fire if the design is based on DIN EN 1996-3/NA as when it is based on DIN EN 1996-1-1/NA. x | |||||
Medzech, Jürgen; Schrade, Holger | Central Bus Station, Kiel: a perforated brick facade for the parking block / Parkhaus ZOB Kiel: Eine gelochte Mauerwerksfassade für den Zentralen Omnibusbahnhof | Mauerwerk | 5/2019 | 316-323 | Berichte |
AbstractOn the occasion of the Olympic sailing competitions in Kiel, the ZOB and the multi-storey car park above it were built in 1972. x | |||||
Förster, Valentin; Graubner, Carl-Alexander; Proske, Tilo | Experimental determination of the load-bearing capacity of a reinforced perforated brick facade / Experimentelle Traglastermittlung einer teilweise bewehrten Lochfassade aus Ziegelmauerwerk | Mauerwerk | 5/2019 | 324-333 | Fachthemen |
AbstractFor a new multi-storey car park over the Central Bus Station (ZOB) in Kiel, a perforated clinker brick veneer facade not conforming to standards was planned. The design and technical characteristics of the facade have already been described in the article by Medzech and Schrade in this issue [1]. This article deals with the experimental investigations carried out to obtain a project-related one-off approval (ZiE). These experiments contain in particular large tests on storey-height wall sections, which were subjected to eccentric compressive loading and partly to horizontal loads representing wind action. Supplementary small tests on unreinforced and reinforced masonry served to determine the bending capacity, the anchoring capacity of the reinforcement and the load-bearing capacity of the wall anchors in the masonry. Due to the special facade construction with special bricks for the project, wall anchors, reinforcement bar couplers and unique test set-ups had to be developed for the specific project. x | |||||
BAM investigates the use of clay masonry for sustainable housing construction / BAM erforscht Lehmmauerwerk für den nachhaltigen Wohnungsbau | Mauerwerk | 5/2019 | 334-335 | Aktuelles | |
Veranstaltungen: Mauerwerk 5/2019 | Mauerwerk | 5/2019 | 335-338 | Veranstaltungen | |
Abstract15. Professors' conference at the Aalto University, Finland / 15. Professoren-Tagung in der Aalto University, Finnland x | |||||
Firmen und Verbände: Mauerwerk 5/2019 | Mauerwerk | 5/2019 | 338-339 | Firmen und Verbände | |
AbstractGuide to the complex BIM method / Wegweiser durch die komplexe BIM- Methode x | |||||
Rezensionen: Mauerwerk 5/2019 | Mauerwerk | 5/2019 | 339-343 | Rezensionen | |
AbstractMauerwerk-Kalender 2019 / Mauerwerk-Kalender 2019 x |