The jury dignified Swietelsky’s Tunnelbau newest method for the building of vertical drawing shafts and the construction machine usage from the HTB.
Milling on a 45% inclination? HTB makes it possible!
The challenge during the project in Untersberg was the creation of a cable trench on a rough terrain with a partly 45% inclination. Since normal trench cutting machines were not efficient enough for this project and didn’t conform to the regulations, a new machine had to be invented. For that matter HTB Baugesellschaft m.b.H built their newest innovation, a 2m cutting wheel with a width of 300mm attached to a modified 35t-digger. The modification of the digger included an extension of the running gear and a strengthening of the supply circuit through further protections. HTB did not only convince with the large cutting wheel and the modified digger. The company was also able to make the machine eco-friendlier by using bio-hydraulic oil and bio-diesel.
Swietelsky Tunnelbau: New procedure in the vertical drawing shaft sector
During the project Semmering Basistunnel SBT 2.1 Tunnel Fröschnitzgraben, Swietelsky Tunnelbau utilized a new shaft building system.
The construction SBT 2.1 Tunnel Fröschnitzgraben is the largest construction section of the Semmering-Basistunnel. This tunnel section is 13 km long and contains an emergency station, the ventilation building as well as two air shafts. The emergency station’s mine working and the distance pipes of this section are exclusively used through two shafts of the Fröschnitzgraben part. These two shafts are 410 meters deep and access to caverns, which were especially broken out for the project. The emergency stop of the Semmering-Basistunnels is formed in this area during the final stage of the project.
From the broken-out cavern occurs the advance to Gloggnitz and Mürzzuschlag (Austria). While the 4km long section to Mürzzuschlag is made through periodic explosions, the 9km long section in the direction of Gloggnitz is built through the continuous use of pipe-jacking machines.
The supply and dumping of the four machines is made through the two shafts, which were especially built for this purpose. During the construction period, the bottom of the shafts consists of a large and complex system of caverns, tunnel and struts. During the operational phase, an emergency stop, which is supplied with fresh air through a ventilation building located on the surface, is established. Swietelsky Tunnelbau is the single company which performs as an ARGE-Partner SBT 2.1 besides the common tunnel constructions, the supply of the shaft systems as well as the drilling of the shafts and the dispatching for the ARGE.
Systematics of the innovative tunnelling
Over the drilling of the shafts, laths are installed as a conduction for the transport of materials, the drilling stage and the transport cage for persons. These laths will be used for the final transport of materials and persons after the finishing of the shaft. The conversion from the sinking systems to the transportation system solely requires the exchange of the drilling stage with the transport cage. This enables a reduction of the conversion time to a third of the time of conventional systems. Machines are transported through the shafts with a lift, which also simplifies the junction of the shafts to further breakouts in the shaft base.
This new method developed by Swietelsky Tunnelbau was labelled with the Bautech Sonderpreis 2017. Further information about HTB’s achievement at this year’s Solid Bautech Price can be found below.