Double story extension In Selby part 3
In order for us to carry on building, we had to have some steel measured, made and delivered to site. The problem was that this RSJ in particular weighed exactly one tonne and was eight meters long! So we organised for a crane to lift it up from the delivery wagon, then maneuver it around the back of the building where we were working. It was a tricky one for sure, involving lifting it up and over the house, using a rope wrapped around one end of the steel as a steady guide. This was so it was secure and wouldn’t spin out, potentially causing damage to the customers home or the new double story extension we were constructing.
Once we got the chains in position and around the steel, it was ready to lift in to position. The gigantic piece was lifted carefully into an elevated position atop two scaffolding towers.
We had previously held the house up with 2 meter long metal ‘acro’ props, which we fix into place under the existing house bricks at 600 centres. With all this in place, the steel was ready to be installed and finalised. We lifted the piece from it’s position atop the scaffolding towers on machinery known as genie lifts, which are a kind of hand-driven fork lift like that you crank gradually to lift any objects that are on the heavier side of the building site. We actually used four of them to lift steel, which could be considered overkill but it’s much better having the extra support and not needing it, than needing it and not having, especially when you’re lifting a tonne piece of steel three meters in the air!
We got the steel installed smoothly, and in position under the existing house joists to hold the floors upstairs in position. Then, we set the steel in place and bolted it to the upright plinth we had previously installed prior. We have installed lots of steels over the years, but the specification on steel RSJ are getting bigger and better. The days of lifting steel around the back of building sites by hand are numbered, and it’s be coming more and more common for cranes to be necessary. Stay tuned for part 4 …..