Today Sochi is a place where a lot of construction projects are being realized before the winter Olympics in 2014. Here we are going to see how they are building road tunnels in the city applying new technologies.
They use a drilling rig for horizontal drilling. Then they insert the fiberglass pipes into the drilled holes.
The new technology is used for the first time in Russia. It is already widely applied in Europe. Such method of construction allows to produce works in soft soil in a more effective way. They strengthen the soil with a shield made from the pipes which helps to minimize the risk of slide and makes the work in the tunnel safer.
Then they are pumping cement into the pipes to form a special protective shield that will let making the tunnel heading at the full section.
The loader is here to load the soil on the dumper that will take it away.
They use a hydrohammer for the work.
Then they start mounting the rough lining. They mount a steel arch first that is grouted by the special machine.
Then they have to provide the tunnel waterproofing to mount such frames from both sides. Only then the tunnel is ready for concreting.
The concreting is made with concrete pumps and the solution is delivered from plants.
When the concrete is solid enough they start to remove the formwork. Then they lay rails for carriages.
When the waterproof works are over they start mounting of the reinforcing cage. They keep working 24/7.
The rampant was specilly made for the trucks.
Then they can start concreting.
The pump provides concrete supply.
When the concrete becomes solid the inventory formwork is dismantled and moves further to repeat the whole cycle again.
Everything must be smooth. This is a tunnel which is located next to that one on the photos above.
And these are some photos from the tunnels being built nearby. They are applying another technology there.
They use special combined machines here. With such a technology they cannot develop the tunnel for the full section and the work is not so safe as it was described above.
The rough lining is made in several stages.
They are concreting the space at the arch.
Here’s a tunnel combined machine.
This is how stross development looks like.
It’s the tunnel combined machine.
They use dumpers for removing the soil too.
The machine needs to be fuelled.
The work in the tunnels is in full swing.
This excavator does not look friendly. It resembles a huge foot of some dinosaur…