Special civil and

Swietelsky understands building projects

The company has been active in this field for more than 30 years. From underground construction, such as deep foundations, excavation pit and slope stabilisation to construction in high alpine terrain and permafrost regions, such as cable cars and lifts, avalanche protection barriers and galleries - SWIETELSKY is your partner.

The SWIETELSKY subsidiary HTB Baugesellschaft m.b.H. specialises in:


The special civil and underground construction branch in Linz carries out the following activities:


The special civil and underground construction department in Linz was founded in 2001 with around ten employees. Since it was founded, the workforce at the Linz branch has grown to a large number of employees and has very successfully established the name Swietelsky in the special civil and underground construction sector.

More than 900 projects were successfully carried out between 2001 and 2015 and notable progress was made also in the area of product development.

Other fields of activity covered by the special civil and underground construction department in Linz include:

  • S hotcrete, incl. nailing
  • roject planning, solution proposals
  • xtensometer, inclinometer
  • C ement-bound cavity construction
  • P iling
  • A nchors
  • A valanche and rock slide barriers
  • D eep foundations
  • I njection bore anchors
  • S uitability, acceptance tests
  • R ockfall protection, blasting
  • C oncrete restoration, wall pointing
  • A lpine construction, lift foundations
  • U nderground works, tunnel renovations

Find your contact for Special Civil and Underground Construction

The innovative SWIENET system

The innovative SWIENET system was patented in 2010 for temporary as well as permanent protection of excavation pits and slopes. The system consists of a galvanised steel braid with an underlying full-surface erosion protection mat. The system's anchoring and binding system can be adapted to any slope profile.

Advantages of SWIENET compared with conventional systems such as shotcrete include:

  • Much shorter construction time
  • Less space required at the construction site
  • Environmentally friendly owing to the low emissions (no dust generated and reduced use of large equipment)
  • Lower noise emission (no compressed air equipment)
  • No waste caused by rebound or offcuts
  • No excess consumption caused by geological eruptions or profile defects
  • No backwater from slope water
  • Simple repairs in case of damage (generally no need for use of large equipment)
  • Simple recultivation as the draining surface can be vegetated easily

Diaphragm wall and anchor


This type of deep foundation is primarily used in the inner city area in order to enclose excavation pits, construct road and railway buildings and foundation elements.

Whether cut-and-cover or top-down construction, space-saving and deformation-free construction would not be possible without diaphragm wall technology even in groundwater areas.


We offer a wide range of services in the area of anchoring, which are divided into the following sections:

  • Injection drilling anchor for temporary or permanent measures such as excavation pit stabilisation
  • Anchor beam
  • GFK anchors for temporary measures in urban areas with capacities up to 300 kN
  • Strand anchor with working loads up to 3,000 kN
  • Rod anchor with a diameter of 63.5 mm with working loads up to 1,000 kN
  • Furthermore, any kind of tests such as acceptance and suitability tests as well as monitoring activities

Drilling piles and single member piles

Drilling piles

This sector includes deep foundations as well as support of excavation pits in loose or overlapping form. By distributing the occurring forces to stable support layers, it is also possible to develop premises with very little known soil characteristic data without later subsidence.

Single member piles

If the soil conditions are bad, it is often necessary for the deep foundations to rely on single member piles/small drill piles/micro piles. Compared to site-mixed concrete piles with enormous machinery overhead, the above-mentioned piles are a competitive option with transferred loads of up to 1,000 kN possible.

Slope stabilisation

The term slope stabilisation is multifaceted. Depending on the inclination and condition of the natural terrain soil layers below, a mathematical verification of stability is very often not possible. The slightest artificial (construction in or on the slope) or natural (climatic influence) interference in this system causes a failure of the unstable state of balance with incalculable consequences.

SWIETELSKY offers the following measures for support or reconditioning:

  • Clearing of slopes-
  • Cross-linking of rocks with loop-lattice i.e. high-performance lattice
  • Fixed and elastic barriers (rockfall protection wall)
  • Supporting bodies (concrete, shotcrete, finished parts and drilling piles, etc.) in "top-to-bottom" construction and anchoring in deep-rooted, sustainable soil layers by means of prestressed permanent anchors


Shotcrete is ideal for temporary surface support and protection of embankments and excavation pits under construction, as well as for production of concrete construction parts, supporting bodies and so forth, and in situations in which formwork would be uneconomical. Our services with regard to shotcrete include the following areas:

  • Nail wall made of shotcrete, whereas the soil nailing is usually done with an injection drilling anchor and working load of up to 400 kN
  • Concrete reconditioning
  • Temporary support for underground construction