Service areas

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.

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

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.

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.

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.

Rehabilitating buildings requires a highly sensitive approach to historic building structures and many years of experience. Whether it's the renovation of bridges, buildings or even historic castles

Thanks to our special qualifications, such as our SIVV licence and jet driving licence, you are always on the safe side 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. With our own bricklayers, concrete renovators and special civil engineers, we carry out masonry and concrete renovations including stabilisation work. As a certified specialist company for the protection and repair of concrete components, we also provide you with competent support in the event of unexpected problems and ensure successful completion. 

We offer the following restoration services:

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

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

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.

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