Hochtief Group

Hamburg, Germany

Hochtief Group

Hamburg, Germany
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Agency: European Commission | Branch: H2020 | Program: RIA | Phase: EeB-03-2014 | Award Amount: 6.00M | Year: 2014

NEED FOR INNOVATION: The critical mass of Energy-efficient Buildings (EeB) in Europe by 2020 will be achieved through sustainable industrialisation of high-performance architectural, structural and building-service components. However, realising the targeted performance in design is hampered by critical shortcomings during on-site construction and refurbishment that cause a lower built-quality and sub-optimal energy-saving in the building lifecycle. OBJECTIVE OF THE PROJECT: INSITER aims to eliminate the gaps in quality and energy-performance between design and realisation of energy-efficient buildings based on prefabricated components. The key innovation of INSITER is the intuitive and cost-effective Augmented Reality that connects the virtual model and the physical building in real-time. INSITER will develop a new methodology for self-instruction and self-inspection by construction workers, subcontractors, component suppliers, and other stakeholders during on-site working processes, supported by a coherent set of hardware and software tools. HOW THE OBJECTIVE WILL BE ACHIEVED: INSITER will substantially enhance the functionalities and capabilities of measurement and diagnostic instruments (like portable 3D laser scanners, thermal imaging cameras, acoustic and vibration detectors, real-time sensors) by means of a smart Application Programming Interface (API) and data integration with a cloud-based Building Information Model (BIM). The triangulation of Geospatial Information, Global and Indoor Positioning Systems (GIS, GPS, IPS) will support accurate and comprehensive Virtual and Augmented Reality (VR and AR). RELEVANCE TO THE WORK PROGRAMME: Through new self-inspection techniques, INSITER will fully leverage the energy-efficiency potentials of buildings based on prefab components, from design to construction, refurbishment and maintenance. It will scale-up the use of BIM for standardised inspection and commissioning protocols, involving all actors in the value-chain.

Agency: European Commission | Branch: H2020 | Program: MSCA-RISE | Phase: MSCA-RISE-2015 | Award Amount: 909.00K | Year: 2016

EXCHANGE-Risk is an Intersectoral/International Research and Innovation staff exchange scheme between academia and the industry in Europe and North America focusing on mitigating Seismic Risk of buried steel pipeline Networks that are subjected to ground-imposed permanent deformations. It also aims at developing a Decision Support System for the Rapid Pipeline Recovery to minimize the time required for inspection and rehabilitation in case of a major earthquake. EXCHANGE-Risk involves novel hybrid experimental and numerical work of the soil-pileline system at a pipe, pipeline and network level integrated with innovative technologies for rapid pipe inspection. The outcome of the project is a series of well targeted exchanges between the partners (involving more than 30 early stage and experienced researchers) within a well defined framework of innovation that ensures transfer of knowledge between the academia and the industry, Europe and North America as well wide dissemination of the methodologies and tools developed to the engineering community.

Luking J.,Hochtief Group | Kempfert H.-G.,University of Kassel
Bautechnik | Year: 2012

The plugging effect of open-ended piles and hence the change in the load bearing behavior has been investigated in this research work. The state of knowledge assumed that the plug can close up the pile base completely and for this reason it was treated monolithically. The load bearing behavior was comparable to a closed-ended pile. But the soil-mechanical processes were mostly unknown. The experimental part contains model tests and PIV-(Particle Image Velocimetry) tests. The test piles were arranged with equipment for measuring each part of the pile resistance (inner and outer shaft resistance and resistance of the pile toe). Because of variation the boundary conditions the main influence factors of the plugging effect could be analysed. Furthermore numerical calculations with the FEM were carried out, which show a good agreement between the experimental data and the calculations. The investigations show, that the load transfer in the plug occurs in an inner shaft friction. A fully plugged soil could not be identified and so the classical model representation could be disproved. Based on this results an analytical calculation method is derived, in which each proportion of the pile resistance could be determined. Finally in the statistical part new values of experience for the pile resistance are suggested for the EA-Pfähle. ©Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Budach C.,Hochtief Group | Thewes M.,Ruhr University Bochum
Geotechnik | Year: 2013

Soil conditioning for Earth-Pressure-Balance shield tunnelling with foams, polymers or high density slurries has proven to be an effective measure to extend the application ranges of EPB-Shields towards mixed-grained soils with a low content of fines and coarsegrained soils. By conditioning, the properties of the support medium in the excavation chamber, which mainly consists of the excavated ground, can be changed in order to positively influence i.e. its deformability and permeability. Acknowledging existing results of research on EPB conditioning a new investigation programme was developed, which aimed at a broad and systematic variation of coarse soil types as well as conditioning agents. Based on the results of the laboratory research, a chart for the application ranges for EPB-Shields using various conditioning agents was developed, which shows some significant differences to the existing empirical charts that by large are based on job site experience. Copyright © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Flohrer C.,Hochtief Group
Betonwerk und Fertigteil-Technik/Concrete Plant and Precast Technology | Year: 2014

Ducon consists of numerous layers of reinforcement in the form of point-welded wire mesh and high- performance fine mortar infiltrated into the wire mesh. To strengthen the columns in a bank building, a Ducon shell approximately 7 cm thick was planned to be installed in the public area to guard against possible bomb attacks. Although the Ducon material can be applied as spray mortar, reinforcement in such cases would have to be installed layer by layer. The use of spray mortar, moreover, is not possible in banks. In the Ruhr region in North Rhine-Westphalia, Germany, as well as elsewhere, sand-lime brick was commonly used around 20 years ago in construction of basements of detached homes and row houses. The composition of these materials was not suitable for permanent exposure to the action of moisture. As expansion took place owing to the action of moisture, caused by defective sealing, deformation and cracking occurred to such basement walls.

The article discusses how cementitious floorings were repaired in the Stachus-Passagen mall in Munich. The cracks that had formed after several weeks were to be repaired because their edges broke out as a result of heavy floor use. Also, the cracks showed a considerable degree of soiling and had a strongly disruptive effect on the appearance of the flooring. Cracking was due to temperature- and shrinkage-induced shortening and local bond disruptions, cavities within the screed and toward the base, and crack propagation in the reinforced- concrete base. The concept included the use of a cementitious material to fill the major part of the large cracks from the top and the closure of narrow cracks so as to prevent epoxy resin from penetrating to the surface and causing discolorations during the subsequent epoxy injection. Cracks had to be firmly closed, and the bond to the base was to be restored by removing existing cavities.

In the Polish city of Swinemünde, a new liquefied natural gas (LNG) processing facility is being constructed for completion by 2014. The liquefied gas is transported to the facility by sea. This makes it necessary to provide a new port facility. A key element of this port is a 3 km long breakwater with integrated mooring facilities for gas tankers. This will create an enclosed port basin between the shore and the sea, with a water depth of up to 14.50 m. The construction consists of sheet piling at the centre of a bank, which is constructed to be suitable for vehicular traffic. In addition to the infrastructure for handling the ships, the breakwater includes a complex pipe system which is used to convey the liquid gas. Copyright © 2012 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Schaab A.,Hochtief Group
Cement International | Year: 2014

The case studies presented in the article should demonstrate why, from the perspective of a construction company, a uniformity of concrete properties over the entire construction period is necessary. Uniform properties of all constituents are essential. The uniform composition of the cement is important, because the cement reacts not only with water but also with the concrete admixtures. The interaction of these concrete admixtures with the cement very quickly leads to undesirable negative reactions, if changes in the composition of the cement occur. Clearly visible on the basis of the case examples, are false reactions due to temporal changes in the sulphate carrier composition or the C3A modification in combination with the concrete admixture. This can lead to significant changes in properties of the fresh concrete and depending on the construction process it may even lead to a stop in construction work. It should therefore be the target of all involved in the construction process, to avoid this situation associated with loss of reputation and increased cost and claims. Individual solutions in the quality control plan specified bilateral property evidence or certificates of the compositions may be a solution in the short term. They are not a practical solution for everyone, because they do not consider the difficulties of the work-sharing process with various contractual partners, cement manufacturers, ready-mix concrete producers, contractors and the end customers. Therefore a practical solution requires a normative regulation of the uniformity of the cement properties for concrete monitoring classes 2 and 3 in Germany. This will not always be possible without changes in cement production, but the historical development of cement and concrete production also shows that positive changes in the process adjustments for the common good have always been possible. Therefore it is up to all involved to make the future task itself solution-orientated and positive.

Flohrer C.,Hochtief Group
Bridge Maintenance, Safety, Management, Resilience and Sustainability - Proceedings of the Sixth International Conference on Bridge Maintenance, Safety and Management | Year: 2012

A historical development of the test method and the application of various investigations and test equipment in case studies will be presented. Case studies of pre-tensioned and post-tensioned concrete structures and bridges in Germany and Hungary, and the application of the scanning remanent magnetism method to detect wire fractures in lateral tendons of bridge decks, show the possibilities of non-destructive testing methods. Logistics, traffic management, economics and methods for rehabilitation also will be discussed. Hillemeier, Bernd, Pak, Chol-I., (2012), Magnetic Localization of Fractures of Broken Wires in Pre-stressing Cables of Bridges and Parking Decks; IABMAS 2012 © 2012 Taylor & Francis Group.

Hochtief Group | Date: 2012-04-10

commutators, pressure switches for commercial and industrial equipment, electric switches. sanitary apparatus and installations, namely, bidets, showers, complete shower cubicles, shower heads and taps, handles for showers, bath tubs, toilets, toilet bowls, toilet seats, urinals, shower tubs, whirlpool baths, bath installations, sink traps, sink sprayers; sink units, namely, sinks, sink pedestals, sink traps, sink strainers, sink sprayers; flushing apparatus, namely, automatic flush valves for toilets, flush levers; partitions for bath tubs or showers, namely, shower stands, shower platforms and shower surrounds; toilet flushing tanks; bath and sanitary plumbing fittings, namely, aerators for faucets, drains, spouts, shower control valves and shower mixers; hand held shower heads; lights, namely, ceiling lights, pendant light fixtures, standard lamps and wall lights; heating apparatus, namely, heat generators, heat pumps and heat registers; heating installations; radiators; electrical convectors, namely, porcelain stoneware heaters; electric radiant heaters; electric space heaters; gas water heaters; air-conditioning installations and apparatus. figurines and statuettes of stone, concrete or marble; works of art of stone, concrete or marble; non-metallic building materials, namely, plastic pipe supports, fly ash, stair nosings not of metal and pre-cast concrete wall forms; glazed ceramic tiles; natural stone; artificial stone; tiles, not of metal; non-metallic wall tiles; stone panels for flooring; wall paneling; ceiling, fireplace surrounds, countertops and furniture; tile flooring, not of metal; non-metal ceramic or wood floor tiles; non-metallic doors and door frames; glass doors. door fittings, not of metal; window fittings, not of metal; works of art of wood, wax, plaster or plastic; figurines and statuettes of wood, wax, plaster or plastic; mirrors; mirror tiles; bathroom furniture and parts and components therefore; washstands; furniture, namely, chairs, armchairs, cupboards, chests of drawers, beds; towel racks. bathing accessories, namely, soap dispensers, waste bins, beakers, namely, wide mouthed drinking cups for household use, hair brushes, nail brushes, toothbrushes, flasks, boxes of glass, beverage glassware, towel rails and towel rings, combs; ceramics for household purposes, namely, knobs and pulls for cabinets, drawers and furniture; tissue box covers and decorative tile not for use as building materials; non-metal baskets for domestic use; perfume vaporizers sold empty; porcelainware, namely, cake decorations, flower pots, jars for jams and jellies and doorknobs; brushes for shaving purposes; stands for shaving brushes; basins; soapboxes, non-metal soap baskets; dishes for soaps; crockery, namely, dishes, plates, cups, saucers, bowls, serving bowls and trays; toilet paper holders, dispensers for toilet paper, pottery, namely, dishes, plates, cups, saucers, bowls, serving bowls and trays; wash-hand basins; works of art of porcelain, terra cotta or glass; figurines and statuettes of porcelain, terra cotta or glass; glass jars. non-textile floor coverings and wall hangings; carpets, rugs, mats and matting; linoleum for covering existing floors.

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