Founded in 1875, originally as a masonry operation, the construction company Gebrüder Stolz GmbH & Co. KG is now in its fifth generation in the construction sector. The mid-sized firm develops civil engineering and pre-fabricated component projects. From the very start, the company was always looking to the future of construction and anticipating developments, rigorously implementing new tasks and extending its sphere of operations. The Stolz group is headquartered in Hammelburg, Lower Franconia. Its service portfolio runs from civil engineering through earthworks, pre-fabricated component construction and structural engineering to project development, surveying and environmental technology, alongside many other construction fields.

Rund 30.000 Kubikmeter Erde bewegte das verantwortliche Bauteam von Gebr. Stolz

Our employees are all very happy to work with the iTWO solution and get along with it very well

Jens Martin


In Schallfeld, part of the Lülsfeld municipality near Schweinfurt, the construction company renovated 3.6 kilometers of roadway on behalf of the Schweinfurt State Building Authority from July to December 2016. Already before the turn of the year, the section was once more open for road users. The responsible construction team at Gebr. Stolz moved around 30,000 cubic meters of earth, according to surveyor and software expert Jens Martin. The 20-person team, consisting of construction managers, calculators, surveyors, apprentices and specialist workers was able to keep to the schedule, despite a somewhat above-average rate of interruption due to rain. The team laid around 6,000 meters of drainage pipes and milled around 31,000 square meters of pavement surface. The clearance of 3,300 square meters of forested land was also required. To protect the surrounding woodlands, the construction team erected an approx. 240-meter long wooden safety fence. The cost of the renovation: approx. 3.1 million Euro.


Together with apprentice Linus Büchner, Jens Martin was responsible for many tasks in the Schallfeld construction team: These included testing the polygonal points given by the client, compaction and leveling activities, creating a basis for GNSS measurements – both for the foreman on site and for control of the tracked loader and grader – creating various records for construction billing and site plans, and last but not least, providing all the digital data required for surveying, machine control and billing. A unified, thoroughgoing, digital plan for the construction measure was created in-house at Gebrüder Stolz using the RIB infrastructure software iTWO civil. The software has been used at the company since 2016 for civil engineering projects and drainage measures. Martin is the expert in the software system. His tasks also include supporting colleagues in using the software, as he has been working with RIB programs for many years in highway engineering. Martin himself values highly the transparency and optimized interplay of individual functionalities in the new RIB solution iTWO civil, which are an improvement on previous programs.

Surveyor and software expert Jens Martin created a new digital specification with RIB iTWO civil based on digital plans and paper-based documents already provided by the planning office.


The engineering office tasked with the planning, Höhnen und Partner from Bamberg, provided a CAD plan as the basis for works. Alignments, gradients and cross-sections were already available in digital form. Likewise the site plan, which was created in dwg format. Further aspects, such as, for example, the digital specification and shaft lists, were at first only available in paper form. “As the basis for the construction in Schallfeld, I created a new digital specification in iTWO civil from the digital data already available and the paper files. This was then compared with the planners’ digital specification. Within the RIB software, we supplemented additional information, such as stake-out data, ourselves,” Martin reports.

Except for a few inconsistencies in the detail of the lane widths in the digital specification and in the drainage plan, the transferal of the plans into RIB iTWO went smoothly. “During the plausibility check before the execution of the building measure, the number of shafts for drainage was found not to be correct,” Martin explains. “After a short consultation with the planners and a small change to the digital plan, in which we replaced two shafts with a slotted channel in iTWO civil, we were able to resolve this small inconsistency very quickly and then use the newly created data in the program.”

From the final state of planning, intended for execution, data were prepared from iTWO civil and made available digitally for the tracked loader and grader.

Billing by cross-section also took place with iTWO civil. The documentation required by the client, consisting of cross-section plans, calculation logs and test files as per REB VB 21.013, were created at the touch of a button and could be handed over in the quality demanded.

Before/after comparison: Billing by cross-section also took place with iTWO civil.
Small inconsistencies in drainage were swiftly resolved thanks to iTWO civil

Small inconsistencies could be resolved very quickly and the newly created files were then used in the program

Jens Martin


After only two introductory training sessions, apprentice Linus Büchner and further colleagues at Gebrüder Stolz who work with iTWO civil were able to get to grips with the functionalities of the infrastructure software. First, they were introduced to the basis of the software; then they received training on the special topic of cross sections, from which billing is derived. The feedback on the software application was fully positive. The speed of the 64-bit system is also valued highly in the firm. Even if this measure is not one of the largest in the field of construction, the added value was clear and would certainly be even more significant for tasks with higher data volumes. On the Schallfeld site, Martin and Büchner made intensive use, for example, of the actual/planned comparison when checking the ground formation layer and the upper surface of the frost protection layer for height on site and creating a measurement log for it in iTWO civil. In this way, proof of quality and the current state of construction (progress report) were almost immediately available.

Martin concludes: “Our employees all are very happy to work with the iTWO solution and get along with it very well. The surveyors in our firm started straight out with the RIB system and very quickly learned how to use it. And if there are queries at any time, I as the former key user and CAD expert usually know the right solution.”

Benefits for Gebrüder Stolz: 

> high transparency in the planning process

> improved coordination of all involved in planning

> BIM as an all-encompassing method ensures quality in the project

Are you interested? Then get in touch with us!


RIB Experts

Always the right contact for your specialist questions about our products.



Contact & Hotline

Solutions for planning, construction and operation

Solutions for structural engineering and test engineers

RIB training / seminars

Product hotline