Detta examensarbete har utförts på uppdrag av Johan Lundberg AB som har haft ett behov av att det tas fram en guide vid åtgärder av vattenledningar. Åtgärder kan innebära nyläggning, utbyte eller renovering av en vattenledning. Syftet med rapporten är att ta reda på om ett visst material eller metod kan användas till vattenledningar, få fram för- och nackdelar med dessa material och metoder, både för installationsfasen och för driftsfasen. Detta görs ur ett långsiktigt tekniskt, ekonomiskt och miljömässigt perspektiv. Rapporten innehåller en faktadel med tänkbara material och schaktfria metoder och sju stycken intervjuer med ledningsägare har genomförts och en sammanställning av dessa intervjuer presenteras i kapitel 5.3. Intervjuerna har utförts för att få reda på flera ledningsägaras erfarenheter av material och metoder och även deras kravställningar på vattenledningar. I slutsatsen konstateras att PE är det material som används mest av de intervjuade ledningsägarna, men också att det finns flera problem med PE som rörmaterial i vattenledningar. När det gäller metoder är det svårt att ge en entydig slutsats för vilken metod som passar bäst för nybyggnad, utbyte eller renovering av vattenledningar. I bilaga 1 sammanställs de fakta och erfarenheter som har framkommit under detta examensarbete. Denna sammanställning kan tillsammans med de flödesscheman som också finns i bilaga 1 ses som en guide med riktlinjer för ledningsägare när de ska åtgärda sina vattenledningar. / This thesis has been carried out on behalf of Johan Lundberg AB, which has had a need to be developed a guide for action by the water that is in need of new water mains, replacement or renovation. The purpose of the report is to find out whether a particular material or method can be used in water supply, obtaining advantages and disadvantages of materials and methods, both for the deployment and operational phases. This is done from a long-term technical, economic and environmental perspective. This report provides a fact based section with possible materials and trenchless methods that can be used for new lines, replacement or refurbishment of water pipes. Seven interviews with tap owners have made and a summary of these interviews are presented in Section 5.3. The interviews have been conducted to find out more water owners experiences and requirements scores on water pipes.  In the conclusion found that PE is the material used in most of the interviewees tap owners, but also that there are several problems with PE as material for water pipes. When it comes to methods, it is difficult to give a clear conclusion to which method is best suited for new construction, replacement or renovation of water pipes. Appendix 1 summarizes the facts and experiences that have emerged during this thesis. This compilation together with the flowcharts also in the appendix 1 can be seen as a guide for tap owners when to fix their water pipes.

The assignment given to us by NCC was to compose a degree project based on ground excavations for power cables. The aim of the study was to examine suitable excavation methods depending on different possible terrain conditions. The amount of previously written material within this subject is nearly non- existent and therefore there is a genuine interest by the NCC to receive a compilation of different production methods. The greater part of this study is based upon interviews with several companies active within this area of expertise. The technique of placing the electricity grid beneath ground for safety is today getting more and more common. The aftermath of the hurricane “Gudrun” has forced several power companies to re-evaluate their electric supply network, which has lead to more placements of power cables underground. We have come to the conclusion that there are several factors that would affect the method of choice for cable excavations. Costumer demands, obstacles and the difference in ground conditions are vital factors behind the verdict for suitable production methods.

<p>The assignment given to us by NCC was to compose a degree project based on ground excavations for power cables. The aim of the study was to examine suitable excavation methods depending on different possible terrain conditions. The amount of previously written material within this subject is nearly non- existent and therefore there is a genuine interest by the NCC to receive a compilation of different production methods. The greater part of this study is based upon interviews with several companies active within this area of expertise. The technique of placing the electricity grid beneath ground for safety is today getting more and more common. The aftermath of the hurricane “Gudrun” has forced several power companies to re-evaluate their electric supply network, which has lead to more placements of power cables underground.</p><p>We have come to the conclusion that there are several factors that would affect the method of choice for cable excavations. Costumer demands, obstacles and the difference in ground conditions are vital factors behind the verdict for suitable production methods.</p>