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《Beton- und Stahlbetonbau》2018,113(5):385-400
Sealing of joints in concrete with waterstops – the new German Standard DIN 18197 – Waterstops correctly designed, dimensioned and used The DIN 18197 “Sealing of joints in concrete with waterstops”, provides a set of rules for both, the planer and the contractor. In addition to relevant details for the design and the professional handling of waterstops on the construction site, selection diagrams are included which, in a simple way, allows the planner to select waterstops in dependence of the loads. This article addresses to the essential rules concerning the joint waterproofing with waterstop and explains by means of several examples and the DIN 18197 selection diagrams, how the planner can specify a waterstop complying with the loads. It is explained in detail what to consider when dealing with waterstops on the construction site. 相似文献
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Sowohl bei der Planung und dem Bau neuer als auch bei der Begutachtung bestehender Parkbauten wird immer wieder die Frage diskutiert, ob die Ausbildung eines Gefälles prinzipiell notwendig ist. Dabei werden verschiedene Argumente zusammengebracht, die zum einen aus der Betrachtung der Nutzung und Gebrauchstauglichkeit des Gebäudes als Parkbau und zum anderen aus der Frage der Dauerhaftigkeit der Tragkonstruktion aus Stahlbeton oder Spannbeton resultieren. Ziel dieses Beitrags ist, diese Argumente zusammenzustellen und zu ordnen. Anhand der verschiedenen Aspekte soll erläutert werden, warum im neuen DBV‐Merkblatt “Parkhäuser und Tiefgaragen” darauf verzichtet wurde, die Ausbildung eines Gefälles als Regelbauweise in jedem Fall zu fordern und – stattdessen – es dem Bauherrn zu überlassen, aufgrund einer Abwägung differenzierter Argumente für und gegen ein Gefälle eine sachgerechte Entscheidung zu treffen. On the Necessity of Gradients at Parking Decks When design and executing new car parks or when surveying existing ones, an often discussed question is whether a gradient of parking decks is always necessary. In this context different arguments are commonly used. These arguments have been collected and reviewed under the aspect of usability as a car park on the one hand and under the aspect of durability of the reinforced construction on the other hand. It has been shown why in the new DBV‐Code of Practice “Multi‐Storey and Underground Car Parks” an incline is not required as a standard construction method in every case. Instead of that it has been concluded that an appropriate owner's decision on pro or contra an incline would be reasonable and necessary based on the above consideration of differentiated arguments. 相似文献
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Christian Sodeikat 《Beton- und Stahlbetonbau》2010,105(12):770-777
Die Bestimmung des Wassergehalts und insbesondere der orts‐ und zeitabhängigen Feuchteverteilung in Baustoffen hat in der Forschung, Baustoffentwicklung, Bauwerksdiagnose und Bauwerksüberwachung einen besonderen Stellenwert. Bei der Untersuchung von Schadensursachen muss an Bauwerken in der Regel die Baustofffeuchte mit bewertet werden, da sowohl wesentliche Baustoffeigenschaften als auch die Dauerhaftigkeit von Bauwerken in entscheidendem Maße von deren Wassergehalt abhängig sind. In jüngster Zeit werden Feuchtesensoren eingesetzt, um die Funktionsfähigkeit und Dauerhaftigkeit von Instandsetzungs‐ bzw. Schutzmaßnahmen zu kontrollieren. Dies soll es dem Bauherrn ermöglichen, rechtzeitig Maßnahmen einleiten zu können, bevor Schäden infolge von Wasser‐ bzw. Chloridzutritt auftreten können. Condition Assessment with Moisture Sensors The determination of the water content in construction materials and in particular with regard to its depth and time dependent distribution is of high interest in the area of research, material development and condition assessment of structures. The assessment of the reason of damages mostly require to regard the moisture content of structures, because the moisture content basically affects material properties and the durability of structures. Recently moisture sensors have been used to control the functionality and durability of repair and protection measures. This enables the owner to carry out accurately timed measures to prevent damages due to the ingress of water and chlorides. 相似文献
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《Beton- und Stahlbetonbau》2018,113(10):737-745
New research results for the protection of building components under paving The use of permeable paving for parking areas e.g. is now one of the most common variants in single‐storey underground car parks without ground water or the ground floor of parking garages to avoid the relatively expensive to be coated and reinforced concrete floor slabs as a roadway. If a load‐bearing floor slab is not used, the loads are discharged into the ground via single and strip foundation under the paving slab. Accordingly, the entrained meltwater entrained by cars passes through the permeable pavement to the components lying in the ground. In order to ensure the durability of the reinforced concrete components under the pavement surface in the event of exposure to chloride, the planner must take appropriate measures. The studies presented by the University of Applied Sciences Munich on parking garages show that there can be significant chloride contamination both on the rising components and on the foundations. Furthermore, the permeability of paving coverings scatters strongly. The laboratory studies carried out by a DBV‐sponsored research project show that the coating of reinforced concrete components can be damaged by the installation of the plaster pavement. Furthermore, it was found that not all coating systems defined in accordance with RL‐SIB provide a practical outsourcing that sufficiently protects the reinforced concrete components against corrosion. In the laboratory tests, flexible sealing slurries or OS 5b systems – which have been tested for permanently occurring chloride‐containing water – proved to be most suitable and can be recommended. 相似文献
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Christoph Dauberschmidt Stephan Vestner Edmund von Thermann 《Beton- und Stahlbetonbau》2012,107(9):570-578
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Dr.-Ing. Maria Teresa Alonso Junghanns Prof. Dr.-Ing. Rolf Breitenbücher Michael Günther Dipl.-Ing. Prof. Dr.-Ing. Michael Haist Jörg Haus Dipl.-Ing. 《Beton- und Stahlbetonbau》2023,118(3):192-200
Concrete basins according to ZTV-ING Concrete retention basins within the German federal highways network are regulated in ZTV-ING. Taking into account the current state of the art and the experiences of the road administration with regard to the construction and operation of such basins and pump houses, a new assignment of the exposure classes for these components should be appropriate. This article takes a differentiated view on the relevant environmental impacts of concrete basins and explains the background for possible modifications to be made in a new ZTV-ING. For example, in case of a global categorization, many components would have to be formally assigned to the exposure class XF4, from which the mandatory use of air-entrained concrete would then be directly derived. However, differentiated considerations, considering specific boundary conditions and many years of experience, also allow the use of concretes without air entraining agents. 相似文献
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《Beton- und Stahlbetonbau》2016,111(7):473-474
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In der vorliegenden Arbeit werden theoretische und experimentelle Untersuchungen zur Beschreibung des lokalen und globalen Tragverhaltens von Holz‐Beton‐Verbunddecken, die an der Universität Innsbruck durchgeführt werden, zusammengefasst. Dabei werden auf der Basis eines Versuchsprogrammes Rechenformate zur lokalen Bemessung der einzelnen Verbindungen sowie der gesamten Verbundträger abgeleitet. Design Rules and Details for Construction of Grooves in Timber‐Concrete‐Composite Constructions This article presents a scientific work on timber concrete floor systems with grooves. Experimental and theoretical works done at university Innsbruck are presented in order to describe the local and global behavior of these shear‐connectors. As a result, all relevant parameters as well as design rules are identified. 相似文献
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《Beton- und Stahlbetonbau》2017,112(4):207-218
Load bearing base plates of underground car parks – Aspects in the planning and possibilities for an effective reinforcement design There is a certain insecurity existent among planners of load bearing base plates for underground car parks: on the one hand they try to meet the requirements in regard to water impermeability and durability against chloride exposure by fulfilling strict requirements in regard to maximum crack width and late restraints. This leads to high reinforcement contents of the base plates, as shown in a parameter study. On the other hand the planner is obliged to plan economically. A possible way out of this dilemma is shown in the draft of the DBV fact sheet ”Car Parks“ and the watertight guideline: the design principle (EGS) ”planning cracks“ allows the reduction of the minimum reinforcement by e. g. targeted placement of crack‐inducing elements and reinforcement design. Another discussed aspect of this paper is to verify the tightness against chloride ingress of different concrete mixtures. It is proven that the approach of the standard to ensure the durability by using high strength concrete is not constructive. It is rather to suggest to reduce the strength of the concrete with choosing a suitable binder. 相似文献
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