When it comes to inserting underpasses and culverts into high dams, open cut tunneling is often hardly feasible from both a technical and a financial point of view. In such cases, hydraulic jacking planned with a geotechnical engineer may constitute an economically viable and safe alternative. The dam is maintained, protected against vertical and horizontal movement and continuously inspected. We have been successful with this process in a variety of projects.
The jacking process
The basic principle of this unique method is, that the structure to be pushed in (i.e. underpasses of any dimension) is constructed on a slide-in rail next to the section of rail or the obstruction. By means of hydraulic presses, the structure is then pushed into the earth body with excavation taking place simultaneously.
Pushing-in through dams Haiding
Cross section: 6,90 x 6,65m
Pushing-in through dams Obervellmar
Cross section: 5,80 x 5,20m
This unique construction method can be applied virtually anywhere (rail, road etc.) and irrespective of soil properties. Our company has been using this technology successfully on countless construction sites in Austria and abroad since 1984.
The major advantage of this method is in keeping traffic interruptions to a minimum which significantly reduces construction costs. The duration of the disruption varies between one and two weeks depending on the dimension of the structure and the distance it has to be moved (compared with three to five months using conventional construction methods)
This unique method can be used in the presence of groundwater without any problems.
Our patented support structures, developed specifically for this purpose allow the pushing-in method to be used even under rail switches.
Building the structure at the side allows for higher quality.
Work in the clearance can be significantly reduced thanks to the short rail and road traffic interruptions. This minimises the potential risk for the construction workers on site.