Teknikhus i prefabricerad betong - Studie av väggelement utan bärankarsystem

Sammanfattning: Technical buildings are small buildings used for electrical equipment or water supply and drainage equipment. Today, the walls of Abetong’s technical buildings consist of two concrete layers with an intermediate foam insulation layer. The weight of the outer layer is transferred to the load-bearing inner layer by means of sandwich panel anchors. The purpose of this study is to propose and investigate the conditions for an alternative construction solution that is more resource efficient. The investigated alternative solution consists of an 80 mm conventional reinforced load-bearing layer, 75 mm stone wool insulation and a 25 mm steel fibre reinforced outer layer. By placing the stone wool insulation directly on the newly cast concrete and then immediately pour the next layer on, a sufficient adhesion strength between the layers should be obtained. This way, it is possible to avoid sandwich panel anchors and this allows the outer layer to be reduced in thickness. Tests were conducted to examine the adhesion strength between concrete and stone wool. The stiffness properties of the stone wool in tension, compression and shear have also been measured. Calculations were made on the effects of wind load, self weight, thermal expansion and mechanical stress on the outer layer. These have been compared to the strength of the outer layer and the strength of adhesion. The results show that the element has sufficient strength and adhesion to withstand these loads. Effects of long-term loads and fatigue are not considered in this study. By adopting this solution, savings of 20 % could be made on materials and labour.