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Technical Note: Example of the Application of Jet Grouting to the Neutralisation of Geotechnical Hazard in Shaft Structures

Abstract

The article presents a geotechnical hazard neutralisation technology for shaft structures. The diagnosis of problems with uncontrolled subsidence of the ventilation duct provided by the authors enabled the development of a schedule of works required for the protection and reinforcement of foundation soil in the shaft area. The technology of protection works was selected after the analysis of the technical condition of shaft structures as well as hydrological and geomechanical conditions. Due to the closeness of the shaft lining, it was necessary to form grout columns using jet grouting and low-pressure grouting technologies. The article presents the issues related to the selected technology and its application to the neutralisation of the emergent geotechnical hazard. The method of performance of recommended works was also described together with their impact on the technical condition of structures discussed as well as their functionality and usage.

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On Changes in Concept and General Composition of Agricultural Tractors

Abstract

Conclusions on the analysis of the state of development in the tractor industry are formulated, aspects of the forecasting concept of transformation, general layout solutions and the theory of promising tractor units with new propulsion systems are considered, a general approach to the pre-design substantiation of new generation tractors is presented.

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Assessment of Performance for Elastomeric Bearings Used on Bridges and Viaducts

Abstract

The in service safety and reliability assurance of bridges and viaducts is determined by the choice of materials and products suitable for the design bearing solution of that construction structure. The paper proposes an operational solution for the performance characteristics assessment and verification of elastomeric bearings, which will be the basis for the consistent and coherent application of the requirements established by technical and legal regulations in the construction domain.

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Constructional Features of Ropes in Functional Units of Mining Shaft Hoist

Abstract

In this paper structural analysis of steel ropes applied in mining shaft hoists was conducted. Functions of the ropes which they fulfilled in these shaft hoists were identified. Expected operational features of ropes were indicated too. An analysis was carried out four identified groups of ropes: hoisting ropes, balance ropes, leading rope and fender ropes. Basic constructional features: geometrical and material of ropes, which they should be characterized in each of mentioned functional groups were indicated. Constructional structures of mentioned steel ropes, the most often applied in domestic mining shaft hoists were described. Observed tendencies in analyzed issues also were shown.

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Experimental identification of modal parameters for the model of a building subjected to short-term kinematic excitation

1 Introduction There are two basic methods in the structural dynamics: computational and experimental. Both these methods are equally important and used for both newly designed construction structures and the existing ones. The purpose of both methods is the same - they usually allow for determining the basic dynamic features of the structure (e.g., natural frequencies and their corresponding vibration modes, critical damping ratios) or for determining the level of construction effort (e.g., by determining the actual dynamic ratio). Computer programs based

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Vibration analysis of functionally graded tapered rotor shaft system

applications of machines have been extended due to the development of this new material (FGM), which has been elaborated from a new design and manufacturing philosophies. The first FGMs were used in the designing and manufacturing of mechanical parts for aeronautical, aerospace, maritime and construction structures and so on. Because of their excellent mechanical properties, they can be subjected to severe mechanical and/or thermal stress. Recently, these materials have found other uses in electrical appliances, energy transformation, biomedical engineering and optics [ 2

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Endurance of the wooden bridge reinforced by the dowel plates

to static load, construction structures are also subject to considerable dynamic loads 26 . These can be caused by vehicles, suspension, crane equipment, wind load, the impact of unbalanced mechanisms and so on. The impact of cyclic overload causes material fatigue of the structure, which can further lead to its destruction. In this case, failure can occur at a load much less than that obtained from static tests. The efficiency of using modern steel connecting plates in the rallying of wooden beams in modern construction was already emphasised at the Conference

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