Bautechnik最新文献

Characterization and sustainable improvement of existing foundations

When deconstructing a building, foundation elements often remain in the ground, as their removal and reuse are technically and economically challenging. However, on-site reuse offers ecological and economic benefits. A prerequisite for this is a detailed characterization of the existing foundations in terms of their structural integrity, potential damage, and remaining load-bearing capacity. Limitations arise, particularly due to the immutable reinforcement arrangement, which restricts the load-bearing capacity for new structures. Strengthening or supplementing the existing foundations may be necessary, which is often associated with high greenhouse gas emissions. Bio-cementation through bacterial calcium carbonate precipitation offers a sustainable alternative, but its mechanical properties and bonding effect with existing foundations still need to be investigated. The use of wastewater for bio-cementation through ureolysis, as well as the alternative path of denitrification, are promising with regard to cost reduction and efficiency improvement, but have so far been largely unexplored. This paper describes two sub-projects of the SFB 1683: B04, which deals with the characterization of foundations using inverse identification methods, and A04, which investigates bio-based adaptations of existing foundations for sustainable reuse.

Use of escape rooms in the teaching of civil engineering

While escape rooms were successfully introduced into the entertainment industry many years ago, educational escape rooms are used much less frequently. This article explains what types of tasks and structures are possible in escape rooms and how they can also be used in university teaching to convey specialised content and solve engineering problems in a playful way. Three educational escape rooms developed independently by the authors in the field of geotechnics are presented. In each case, the participating students have the goal of freeing themselves from a geotechnical laboratory. Solution paths and examples of escape room puzzles are presented and provide inspiration for transferring them to other areas of civil engineering, such as laboratory exercises. The article is therefore aimed at civil engineering lecturers who want to use the concepts presented to transfer their application to their specific area and thus enable an enrichment for teaching.

Automated fine processing of reinforced concrete elements for modular reuse

The construction sector significantly contributes to global CO₂ emissions, with cement production playing a central role. Reusing existing reinforced concrete elements from existing structures offers a sustainable way to reduce greenhouse gas emission and resource consumption. This requires the processing of deconstructed, aged reinforced concrete elements with individual properties and edges that enable further use and integration into new modular load-bearing structures. The focus is on automating the individual subprocesses to achieve a standardized and quality-assured process. This contribution presents a comprehensive concept for the automated fine processing of reused concrete elements. First, requirements for the fine processing are defined, from which a process engineering approach for the preparation of the concrete elements can be derived. Target parameters for the reused modules after fine processing are derived from experimental investigations. Cutting tests with variable processes and boundary conditions and associated load tests show that concrete sawing allows the precise manufacturing of flat surfaces. By contrast, water jet cutting reduces the accuracy and thus the load-bearing capacity as pressure contact. These and future results will be successively integrated into the simulation-based testing of processing methods and planning of tool-specific paths of the automated fine processing. Moreover, extension with a system-specific data model enables a linked and individualised energy analysis and forecasting of the overall system.

Process-driven sustainability assessment for the reuse of concrete components in the digital ecosystem

The reuse of concrete elements offers significant potential for reducing greenhouse gas (GHG) emissions and waste in the construction industry. In particular, transport processes in reuse can have a major impact on the sustainability of such practices. To efficiently design the necessary logistic processes, a simulation-based process model of deconstruction and transport routes is being developed to optimize the distribution of reused components from deconstruction projects. The coupling of sustainability analysis with simulation enables a comprehensive assessment of environmental impacts and the consideration of sustainability aspects in the distribution of supply and demand for reused concrete elements. The process-based simulation model and sustainability assessment are integrated into a digital ecosystem.

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Im Zuge der Ortsumgehung Bad Kösen wurde eine semiintegrale Großbrücke über das Saaletal errichtet. Mit einer Gesamtlänge von 1226 m und einer Höhe von bis zu 65 m ist das Bauwerk eine der größten Talbrücken in Deutschland. Aufgrund der besonderen Randbedingungen kam bei der Saaletalquerung eine Hybridbauweise zur Anwendung. Der Mittelteil der Brücke wurde als Spannbetonhohlkasten im Freivorbau errichtet. Die nördlichen und südlichen Überbauten wurden hingegen in Stahlverbundbauweise mittels Taktschiebeverfahren hergestellt und anschließend mit dem Spannbetonüberbau monolithisch zu einem fugenlosen Tragwerk verbunden. Weitere Informationen dazu lesen Sie im Beitrag von Toralf Zeißler et al. Quelle: Toralf Zeißler et al.

The new Berliner Brücke in Duisburg

The Berliner Brücke in Duisburg (BAB 59) is one of Germany's largest bridges – and one of the most challenging rehabilitation cases in the federal highway network. Its history is shaped by mining-related ground movements, complex constraints, and ongoing maintenance needs. A replacement is now underway – part of one of the largest motorway projects of the coming years. This is about much more than just replacing an old structure. Located in a dense urban environment, under live traffic, at one of the busiest junctions in the Ruhr area (up to 123,000 AADT, with a heavy traffic share of up to 8 %). The new bridge runs through the city park, residential and industrial areas, crossing railway lines, port and lock facilities, and waterways – and connects directly to the BAB 40 motorway interchange. Nine structures, up to 70 m wide and over 2.1 km long, including four key bridges – Ruhr, Port, Lock, and Station – designed as a “bridge family” with a common architectural language. Skewed railway crossings, tight pier locations, weak soil conditions, and high levels of prefabrication demand tailored solutions. Precisely timed operations, floating in 100 m bridge sections – all under ongoing traffic. Strategic planning is key: the project relies on interdisciplinary cooperation and early market involvement. Planning and execution aim at sustainability, maintainability, and execution reliability.