Papers by Keyword: Dismantling

Abstract: It is increasingly evident that the construction industry must undergo a thorough transformation. Globally, the construction sector is responsible for up to 50% of carbon emissions and approximately 50% of resource consumption. This high resource consumption correlates with substantial waste generation. To reduce the environmental impact of civil engineering, priority should be given to preserving existing structures, even if they require repair or significant retrofitting, or at least reusing their components.. However, practical implementation is challenging, primarily due to the lack of proper assessment of existing structures, which is crucial for making decisions regarding liability. Currently, there are no well-established rules for determining the design life and safety of structures incorporating elements derived from dismantled ones. This paper identifies, based on the report prepared for the European Commission [1], best practices in the construction industry and the most promising measures to reduce its climate impact in the future. From the structural engineer's perspective, these measures would certainly involve substituting carbon-intensive materials with low-carbon alternatives and embracing adaptive, modular, and reversible designs supported by data-driven models. Reuse and disassembly are crucial for circular systems in the construction industry, particularly in designing connections and ensuring the transfer of information about structural elements throughout their lifecycle, including the concept of creating 'smart elements' equipped with Structural Health Monitoring (SHM) systems. The possibilities for implementing the concept of reuse of building structures is also discussed in the paper.

Abstract: This work deals with an adaptable water reactor design built from different modules as a basis for research. These modules are selected according to the application and are used for sensor related cleaning and supporting tasks. For example, to produce a specific water quality or for pharmaceutical applications. Sensor related modules are used to measure various parameters such as temperature, TOC, flow parameters and others. In addition to simple membrane filter modules, UV-C disinfection and experimental modules are integrated into the setup. Modules for pumping processes, for power supply such as solar, for control tasks and the connection systems of water and electricity between modules are also outlined. This system is described on the basis of scientific examples that use this system. In more detail the modules for temperature, TOC measurement, and UV-C disinfection as well as the supply and control modules are shown.

Abstract: Wire sawing with diamond tools is a highly flexible cut-off grinding process with regard to machinable component structure and composition. Nowadays, it is deployed in many fields of application e.g. the dismantling of nuclear or industrial plants. Here, steel has to be cut which results in lower productivity and tool life compared to the conventional processing of natural stone. To ensure a properly designed process the mechanical and thermal tool loads have to be known in advance. This paper presents an analytical model that predicts the mechanical load as a function of the process parameters.

Abstract: According to different diameter of shaft, sleeve thickness, contact length and groove width, various FEM contact analysis calculations were carried out by orthogonal test method in two states -the initial state and the pressurized state- at the oil groove. Then, regression analysis method is applied for data processing to the total deformation and different positions of axial, radial deformation about the model. The analysis result shows that hydraulic dismantling feasibility can be achieved under the precondition of ensuring the strength requirements.

Abstract: The process of end-of-life vehicles (ELVs) recovery usually includes pre-treatment, dismantling, shredding, non-ferrous sorting and finally energy recovery or land-filling. Using enhanced IDEF0 method, various models corresponding to different stages of a vehicle’s life cycle were established in this work together with previous work. Based on these models some key issues are identified to help make a better strategy for ELVs recovery so as to meet the increasing rigors requirements by legislatives such as EU directives.

Abstract: This paper presents the issue of recycling of end-of life vehicles. The first stage of this paper covers a presentation of the recycling system of end-of life vehicles, where the modules of the recovery of components and materials from end-of life vehicle were extended. This stage consists in the modelling of the structure of the sets of components and materials to be recovered from ELV. The third stage is related to an analysis of the processes specified in the module of the disassembly process and the shredding process in the aspect of an analysis of the economic costs of their execution.

Abstract: The scrap car recycling has drawn increasing attention, has become a global problem. Disposal of old vehicles fundamental measure is to establish a sound, professional recovery system. In this paper, my life vehicle dismantling and recycling of the status and features, combined with developed countries, automobile dismantling and recycling of waste professional characteristics, vehicles dismantling and scrap the key technologies of the inquiry.

Abstract: This paper presents a case study of foundation of an inclined independent masonry tower in Angkor. One of the Prasat Sour Prat towers had been dismantled before reconstruction for conservation. The foundation was inclined as the same as the upper structure of the tower and spreading outwards. The inclination was considered caused by foundation failure with some differential settlements of the ground. During dismantling, the soil layers exposed on the trenched section were found rather horizontal than the inclined state that had been expected. Laterite blocks of step slope stones was found to have slid down along the soil mound of the foundation. The mechanism might have been caused by weakening of soil strength by wetting ground. Without dismantling, the real mechanism of the inclination was never known as well as the corresponding counter measures.