The HTF liquid tanks undergo a continuous process of contraction/expansion due to temperature changes, in addition to large variations in the amount of liquid they store, producing cyclic efforts in the supports.
The anchoring+insulation system used for the moving supports on this tank was thoroughly deteriorated. The insulation part was designed and built using two different materials: two insolation plates and one cement grout which add up to approximately 110mm in thickness. The anchoring is base on four M64 anchor bolts per footing, having three supports.
In situ, our team observed that the saddle, the steel plate and the isolation layers moved conjointly. This fact added dynamic friction to the crack party, degrading further and faster the isolating material. In addition, the steel baseplates were installed without rounded corners and act as stress concentrators.
We carry out a complete regrout with the use of epoxy grout ALPHATEC® 800 and using our hydraulic levelling system ALPHAPAD® we worked with the tank in place and allow us to even realign it.
UTE Andasol III
Restoring grout on footings of a HTF tank
31WTE22 BB001 VESSEL 400 m3
11 February 2015 - 17 February 2015
Aldeire Granada, Spain