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Your strong partner in specialist civil engineering.

The range of services offered by PORR Spezialtiefbau GmbH extends from the rehabilitation and preservation of historic structures to customised solutions in commercial construction and the realisation of challenging infrastructure projects. We cover all areas of foundation engineering with our own equipment and experienced staff.

Construction pits
Subsoil improvement
Sealing slabs
Foundation
Retrofitting foundations
Rehabilitation
Underpinning

Contact partner.

PORR Spezialtiefbau GmbH Jochen Kraft General Manager
PORR Spezialtiefbau GmbH Christian Rinke General Manager

Region Nord

Hanover Markus Wenke Technical Regional Manager North
Seevetal Karl Thöne Commercial Regional Manager North
Oldenburg Lars Brömstrup Branch Manager . Competence Centre Foundation Technology
Oldenburg Thomas Cramer Branch Manager . Competence Centre Foundation Technology

Region Ost 

Berlin Patrick Günther Technical Regional Manager East
Berlin Markus Schwarz Commercial Regional Manager East
Chemnitz Lew Schwarz Office Manager

Region Süd

Munich Wolfgang Wiesnet Technical Regional Manager South
Munich Marcel Nyssen Commercial Regional Manager South
Stuttgart Stefan Lechelmair Branch Manager
Stuttgart Jürgen Christ Regional Manager South Foundation Technology

Region West

Dusseldorf André Schürmann Technical Regional Manager West
Dusseldorf Harald Friedrich Commercial Regional Manager West
Dusseldorf Karim El Moustaphaoui Office Manager

Construction pits – secure, stable solutions for any type of subsoil

As a leading provider of deep, turnkey construction pits, we are the go-to source for concepts individually tailored to your construction project. We provide the optimal solution in terms of technology and cost-effectiveness.

The choice of construction method depends to a large extent on the prevailing geological conditions such as stratification of the subsoil or groundwater levels, the existing spatial conditions on the site and the planning constraints. If necessary, we supplement construction pit walls with anchoring, support and bed sealing systems.

Construction pits
BGW and VBG Prevention Centre, Hafencity
Hamburg
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Construction pits
VIDO Frankfurt a. M.
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Subsoil improvement - stabilising existing subsoil cost-effectively

Because the use of deep foundations or large-scale soil replacement for very soft or relatively unstable layers tends to be very complicated and expensive, more targeted subsoil improvement measures can be a significantly more economical alternative.

We offer a wide range of both traditional and innovative techniques for stabilising existing subsoil. Our broad portfolio of technical capabilities allows us to tailor our services to the individual conditions of your construction site.

The cost effectiveness of a stabilisation measure and the amount of work involved always depend to a large extent on the local boundary and planning conditions and the technology used. These boundary conditions essentially determine the manufacturing grid of the stabilising elements used. As a provider of subsoil improvement measures, we are your single, go-to source for processes tailored specifically to your construction project. As such, we provide the optimal solution in terms of technology and cost-effectiveness.

We offer the following soil improvement services:

  • Soil mixing
  • Ground freezing
  • Compaction grouting
  • Jet grouting
  • Columns encased in geotextiles
  • Vibro compaction
  • Vibro replacement
  • Stump-Franki S³ stabilising column system
  • Vibro in-situ concrete columns
  • Replacement in-situ concrete columns
  • Solidification injections
  • FDP piles (non-reinforced concrete piles)
     

Interested in our methods? All of our methods simply explained: 

How specialist civil engineering works

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Subsoil improvement
Stuttgart 21 – Wendlingen junction Munich
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Subsoil improvement
Helmstedt Edelhöfe
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Subsoil improvement
Deutsche Bahn rail upgrade Oldenburg-Wilhelmshaven
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Sealing slabs - secure alternatives

If a waterproof construction pit, also known as a trough construction pit, does not have a horizontal, watertight soil layer, it is necessary to create a largely horizontal sealing floor slab to close off the pit. 

With every construction task, we take account of the geological, on-site and planning conditions to determine the safest and most cost-effective method for your project. Where necessary, we secure the sealing slab against uplift with grouted micropiles.

As a general contractor, we handle complex construction projects and coordinate tasks that go beyond the scope of specialist civil engineering. This includes all aspects of construction pit work.

We offer the following methods for creating sealing slabs:

  • Deep jet-grouted sealing slabs
  • Soft gel injection slabs
  • Mid-height jet-grouted sealing slabs
  • Underwater concrete floor slabs
     

Interested in our methods? All of our methods simply explained: How specialist civil engineering works.

Sealing slabs
New waterworks Dörenthe
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Sealing slabs
Quartier Hoch 4 Mannheim
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Sealing slabs
RBO
Hamburg
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Foundations - a secure base

The foundation forms the structural and static transition between the structure and the ground. Its primary purpose is to absorb loads from the building and safely transfer them to the subsoil.

As experts with longstanding experience, we are aware of the different types of existing conditions, and the problems associated with foundations. In addition to conventional types of foundation, we also offer special solutions like the Frankipfahl NG® deep foundation element.

When it comes to complex construction works that are affected by foundation issues, our focus is on safety and cost-effectiveness. Our broad portfolio of technical capabilities allows us to tailor our services to the specific conditions of your construction site.

We offer the following methods for foundations:

  • Bored piles
  • Full displacement piles
  • Driven piles
  • Micropiles
  • Jet grouting method
  • Subsoil improvement
     

Interested in our methods? All of our methods simply explained: How specialist civil engineering works.

Foundation
New gas power plant Leipheim
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Foundation
Tunnel trough repair Hamburg
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Foundation
Stuttgart 21 – Wendlingen junction Stuttgart
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Retrofitting foundations - ensuring a strong foundation even in the toughest of conditions

In buildings, under pipelines and under bridges: retrofitting the foundations of existing structures to deadline and within budget depends on a wide range of factors. Changing subsoil conditions and load-bearing capacities, compliance with environmental protection requirements, and many other factors must be taken into account.

In addition, tight spatial conditions often make it difficult to retrofit the foundations of structures that have to be preserved.

With our special equipment, Stump-Franki has no problem retrofitting foundations even at low construction heights and under power lines or bridges. Our experience and the detailed preparation, planning and coordination of various trades have made us an expert in complex tasks in this area for many years.

We offer the following methods for reinforcing foundations:

  • Bored piles under restricted heights
  • Atlas piles under restricted heights
  • Steel pipe piles
  • Micropiles
  • HDP piles/ductile-driven piles
  • Jet grouting
     

Interested in our methods? All of our methods simply explained: How specialist civil engineering works.

Retrofitting foundations
WDR Filmhaus renovation Cologne
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Retrofitting foundations
Reconstruction of a double vault Hamburg
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Retrofitting foundations
DRK Clinics
Berlin-Westend
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Rehabilitation - preserving buildings safely

Rehabilitating buildings requires a highly sensitive approach to historic building structures and many years of experience. Whether you need to rehabilitate a bridge or a building, or professional masonry reconstruction of historic buildings, we provide the appropriate method.

As a certified specialist in the preservation of heritage-listed buildings, with special qualifications including the SIVV licence and pressurised equipment operating licences, you’re in safe hands with us.

One particular challenge is construction projects involving existing structures, as the planning documents for existing structures do not always correspond to reality. This makes implementation more difficult and requires agile planning. Our broad portfolio of technical capabilities allows us to tailor our services to the specific conditions of your construction site and thereby ensure handover on schedule. As an experienced partner, we can provide you with expert support and ensure successful completion of your project.

We offer the following restoration services:

  • Jet grouting
  • Injections
  • Masonry restoration
  • Micropiles
  • Jetcrete
     

Interested in our methods? All of our methods simply explained: How specialist civil engineering works.

Rehabilitation
Zollkanal
Hamburg
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Rehabilitation
Pergamon museum excavation - ARGE BG PMU II Berlin
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Rehabilitation
South Wing Schloss Wittenberg Wittenberg
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Projects
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Underpinning - cost-effective solutions

Underpinning secures a building against slipping or settlement during earthworks. For instance, it may be required if deeper foundations are planned next to an existing building.

Our specialists always come up with a custom solution to secure your building project safe and economical.

As a technology leader in specialist civil engineering, we can carry out all of the necessary work. We prepare specific, coordinated procedural instructions to ensure the high quality and success of the project.

We offer the following underpinning services:

  • Jet grouting (JGM/HPI)
  • Micropiles
  • Conventional underpinning with underpinning walls in accordance with DIN 4123
  • Underpinning with ultra-fine cement grouting
     

Interested in our methods? All of our methods simply explained: How specialist civil engineering works.

Underpinning
DRK Clinics Berlin Berlin-Westend
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Underpinning
Construction pit and jet-grouted underpinning for lot L137 Munich
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Underpinning
Widenmayer City Palace Munich
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Quality assurance with measurement technology

Our core measurement technology competencies include both planning and carrying out static and dynamic pile tests. Our extensive measuring technology ensures high quality.

Our dedicated employees put our expertise into action to guarantee optimised pile tests for our internal and external partners. Our tests are conducted in accordance with the recommendations of the Working Group on Piles (Empfehlungen des Arbeitskreises Pfähle, or EA-Pfähle) and customised concepts.

Measurment technology services:

  • Vibration measurement
  • Fibre optical measurement
  • Integrity measurement
  • Load testing
  • Sound measurement
  • Dust measurement

 

Certificates.

Ensuring quality requirements is a top priority at PORR. This is also evidenced by our certificates and approvals. In order to always be up to date, our certificates and approvals are reviewed and updated on a regular basis through external audits and independent certification companies.

In addition, independent companies, such as Deutsche Bahn AG, confirm our skills and actions through prequalifications and special recognition.

All certificates, approvals and memberships can be found here:

certificates/approvals/memberships
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