Cable Lift Long Upper Landing

 

We had some fun with cranes on this project!

Cable Lifts typically utilize an upper deck that is cantilevered with beams or trusses.  The idea is that on most slopes in the northwest, the soils are questionably stable.  Since most Cable Lifts do not have anything built on the face of the slope, the most vulnerable part is the upper landing deck on the slopes edge.  By cantilevering the deck, we can pull the deck supports back from the edge.  A soils (geotechnical) engineer guides the process. 

In this case, this engineer didn't want to see any supports closer than 20' from the edge...a huge cantilever!  So we engineered and built a long deck, with an elegant truss unerneath.  We were planning on assembling this deck in place from scaffoling, but came up with a better idea.  We assembled the steel structure to the side, upside-down, and then had a crane come in and place it.  First he rotated right side up, and then set it out onto its foundations.

The foundations were reinforced with mocro-pile earth anchors, which typically penetrate 20' into the soil.  They have tremendous holding power, so this deck is really supported!

Most trams do not require such substantial structures, but when its needed, we have a large bag of tricks to draw from.