Kontaktledningsstolpen ur ett bestÃ¤ndighetsperspektiv

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Kontaktledningsstolpen ur ett beständighetsperspektivAbstractTitle:Author:Supervisors:Examiner:Questions:The catenary pole from a durability perspectiveIda MattssonLars-Olof Nilsson Professor at the Division of BuildingMaterials, The Faculty of Engineering at Lund UniversityTorbjörn Svensson REJLERS INGENJÖRER AB, Tradesector RailwaySven Thelandersson Professor at the Division of StructuralEngineering, The Faculty of Engineering at Lund UniversityToday the Swedish railway-network covers approximately17 000 km, where the majority is administered byBanverket. The major parts of these lines are electrifiedtoday. The catenary poles, whose expected life span is 40-50 years, carry the contact line which provides today´s trainwith electricity. Regarding the quantity of catenary polesthe quality varies greatly in the country. The knowledge ofthe catenary poles status also varies heavily. In manyprojects it has been stated that catenary poles often areafflicted by corrosion problems in areas close to thefoundation tops.Civilian transport and cargo transport have increasedsignificantly the past few years. The increasing trafficencumberment is followed by an increasing necessity ofmaintenance. Each year large sums are reserved formeasures in management and maintenance, since theassigned resources are thin it is always a question aboutprioritizing. Regarding management and maintenance forrailways the cost is usually greater than their investmentcost, which should be considered in a life-cycle perspective.Replacing the construction can therefore be a more costeffectiveway.Currently a massive reinvestment program underBanverkets surveillance is in progress. In spite of this thereare lines where the decision to replace poles is not obvius,in some cases a more extensive maintenance is enough. Thequestion is how this should be determined? Is thevii
Kontaktledningsstolpen ur ett beständighetsperspektiveconomical aspect the only interesting one? Maybe there areenvironmental aspects to take in consideration? Is itpossible to correctly state a catenary pole´s and itsfoundation´s actual status? The most important thing isclearly to be aware of the constructions potential damageand its extent. If not there is a risk that resources are wastedon an inadequate and expensive measure.Purpose:Method:Conclusions:The purpose of this thesis is to determine the negativeeffects the catenary poles and their foundations are exposedto, in order to establish a method for evaluation of theconcrete´s and the steel´s condition. To the extent it ispossible, attempts to rate whether it is of interest to adjustthe catenary poles and their foundations in terms ofextending the life of these will be made.The thesis takes its starting point in a relatively extensiveliterature briefing. The literature has been complementedwith interviews, conversations and correspondence.Opportunity was given to attend a field investigation whichwas carried out along the Saltsjöbanan in the area aroundStockholm. During the field investigation the condition fora number of catenary poles were investigated. Theinvestigation was focused on the area between theatmosphere and the top layers of the foundation. Estimatedcalculations for a typical case of a catenary pole were made.The calculations were meant to show how much a typicalcase can corrode without losing its load-carrying capacity.Over the years several problems within the foundation ofthe catenary poles have been stated, among these congelifraction,cracks, porous concrete and corrosion problems.These statements have led to a series of projects which allaimed to map out how the picture of problems appears forcatenary poles and their foundations.Studies have over and over again established corrosionproblems in catenary poles. Steel molded in concrete isnormally well protected from corrosion due to the concreteshigh alkalinity. In the case that pH close to the steel reachesa value of less than 9, as a result of carbonation or as aresult of to high chloride concentration, the passivatinglayer is destroyed and the steel loses its protection againstcorrosion. The catenary poles are only partly molded intoviii
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