Service areas

As a provider of turnkey construction pits, we offer concepts customised to your construction project from a single source and thus always the technically and economically optimal solution for your project.

The choice of shoring method depends largely on the prevailing geological conditions, such as the stratigraphic sequence of the ground or groundwater levels, the available space on site and the planning constraints. Where necessary, we supplement the excavation walls with anchoring, shoring and base sealing systems.
In addition to carrying out specialist works for excavation enclosure, we also offer the construction of excavation pits as a complete solution. As a main contractor, we undertake complex construction projects and coordinate tasks that go beyond specialist civil engineering alone. This includes the complete management of excavation works. Many years’ experience in specialist civil engineering, combined with collaboration across various disciplines, enables us to handle even the most complex ground and excavation projects.

We offer the following methods for constructing construction pits:

• Construction pit walls
• Grouted anchors
• Sealing slabs

As the use of deep foundations or large-scale soil replacement in very soft or low load-bearing layers is usually very time-consuming and cost-intensive, more targeted subsoil improvement measures can be a much more economical alternative.

In this area, we offer a wide range of traditional and innovative techniques for stabilising the existing subsoil. Thanks to our wide range of technical possibilities, we can adapt to the individual conditions of your construction site.

The cost and cost-effectiveness of a stabilisation measure always depend heavily on the local and planning conditions as well as the technology used. These boundary conditions essentially influence the production grid of the stabilisation elements used. As a provider of subsoil improvements, we offer customised processes from a single source that are tailored to your construction project:

We offer the following methods for subsoil improvement:

• Soil mixing methods
• Ground freezing method
• Compaction grouting
• Jet grouting (DSV)
• Geotextile-coated columns
• Vibro-pressure method (RDV)
• Vibratory tamping method (RSV)
• Stabilisation columns Stump-Franki S³ system (CSV)
• In-situ concrete vibration columns (ORS)
• In-situ concrete tamping columns (OSS)
• Stabilisation injections
• VVB columns (unreinforced concrete columns)

In the case of a watertight excavation (trough excavation) where there is no naturally occurring, horizontally extending, water-retarding soil layer, it may be necessary to construct a waterproof base to seal the excavation.

The selection of a suitable waterproof base method is made taking into account the geological, hydrological and planning conditions of the respective project. Depending on the requirements, waterproof bases can also be secured against buoyancy using micro-grouted piles or other structural measures.

PORR plans and implements waterproof bases for a variety of ground and excavation conditions. In doing so, project-specific requirements as well as the relevant technical and economic conditions are taken into account.

In addition to specialist civil engineering services, PORR also undertakes the planning and execution of complete excavation projects on request. Services from related specialist areas can be integrated into the project management process.

We offer the following methods for constructing sealing slabs:

• Deep-lying DSV sealing slabs
• Soft gel injection slabs
• Medium-height DSV sealing slabs
• Underwater concrete slabs

In an era where resources are becoming increasingly scarce, the optimal use of available space is crucial for sustainable real estate projects. This not only pertains to the spatial development of the subsoil for underground parking and storage but also its use as an energy supplier and storage unit.

Near-surface geothermal energy, coupled with modern heat pumps, provides a cost-effective, low-maintenance, and virtually emission-free energy supply. It also leverages local resources like heat and cold and is consistently available, making it feasible at virtually any location. By drilling deep boreholes of up to 400 meters, the natural geothermal potential of your property is harnessed with high efficiency, actively aiding in the decarbonisation of energy supply.

We implement the following design variants:

• Drilling using hollow augers
• Direct fluid flushing drilling (water with flushing additive agents)
• Hammer drilling with air flushing

The foundations form the structural and static transition between the building and the ground. Its primary function is to absorb loads from the building and transfer them safely to the ground.

As experts with many years of experience, we are aware of the different framework conditions and problems associated with foundations. This is why, in addition to conventional foundation types, we also offer special solutions such as the Frankipile NG®.

When it comes to complex construction tasks with foundation problems, safety and cost-effectiveness take centre stage. Thanks to our wide range of technical possibilities, we can adapt to the individual conditions of your construction site.

We offer the following methods for foundations:

• bored piles
• Full displacement drilled piles including atlas pile and fundex pile
• Driven piles incl. Frankipfahl NG®
• micro pile
• Jet grouting
• Subsoil improvement

Retrofitting measures may be required for existing buildings, bridge structures or infrastructure projects. The selection of suitable methods depends on various factors, including ground conditions, the bearing capacity of the subsoil, local space constraints and project-specific requirements.

Retrofitting is often carried out in confined spaces, for example within existing buildings, beneath bridges or in the vicinity of power lines. Depending on the project, a range of specialist equipment and methods are used to meet these requirements.

PORR plans and carries out foundation retrofitting works for various types of structures and uses. In doing so, geological, technical, planning and project-specific environmental requirements are taken into account. Collaboration between different disciplines enables us to successfully manage even complex foundation retrofitting projects.

We offer the following methods for retrofitting foundations:

• Bored piles under limited height
• Atlas pile under restricted height
• Tubular steel pile
• micro pile
• HLV pile / ductile driven piles
• Jet grouting

The rehabilitation of structures requires a keen understanding of historic building fabric and years of experience. Whether performing rehabilitation work on bridges, buildings or even historic castles – we offer you the most suitable method for each project. Thanks to our specialist qualifications, such as the SIVV certificate and high-pressure jet licence, you are always in safe hands with us.

‘Renovation of existing buildings’ presents a particular challenge, as the available plans for existing structures do not always match reality. This complicates implementation and requires flexible planning. Thanks to the wide range of technical capabilities at our disposal, we can adapt quickly to the specific conditions on site. This ensures that the project is handed over on schedule.

With our own bricklayers, concrete restoration specialists and special civil engineering experts, we carry out masonry and concrete restoration work, including stabilisation measures. As a certified specialist firm for the protection and repair of concrete structures, we provide expert support even when unexpected problems arise, ensuring the project is completed successfully.

We offer the following rehabilitation methods:

• Jet grouting
• injections
• Masonry restoration
• Concrete restoration
• micro pile
• Jetcrete

Underpinning is used to stabilise a building against slippage or settlement during earthworks. It may, for example, be required if a foundation at a lower level is planned adjacent to an existing building.

Our specialists develop project-specific solutions and support the safety of construction projects, taking technical and economic requirements into account.

With many years of technical expertise in special civil engineering, we offer a range of methods from a single source. Individually coordinated procedural guidelines support structured and transparent project management.

We offer the following methods for underpinning work:

• Jet grouting (DSV / HDI)
• Use of micro piles
• Conventional underpinning with underpinning walls according to DIN 4123
• Underpinning with fine cement injection

PORR’s services in the field of measurement technology include not only planning but also the carrying out of static and dynamic load tests. Measurement techniques support the documentation, evaluation and assessment of project-specific requirements.

For pile load tests, methods based on the recommendations of the Piles Working Group (EA-Pfähle) as well as measurement and testing concepts developed specifically for each project are employed. These tests are carried out taking into account the relevant technical and project-specific conditions.

Depending on the structure and project requirements, a range of measurement technology methods and systems are available. PORR supports projects throughout various planning and construction phases and integrates measurement technology services into the respective project workflows.

Services in the field of measurement technology:

• Vibration measurements
• Glass fibre measurement technology
• Integrity measurements
• Test loads
• Sound measurements
• Dust measurements