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gbc engineers is a modern and efficient German design office with the main focus on the creation of formwork and rebar drawings.

We offer formwork drawings and rebar detailing to increase the effectiveness of execution planning. The work is carried out quickly and effectively with a specialized team of well-trained engineers and a well-structured quality assurance system. Thanks to the good connectivity via Internet and the smooth exchange of data across offices around the world, we have managed to complete many big projects. We have been in practice for years and have helped many companies to reduce the cost in the planning phase.


Specializing in formwork and reinforcement drawing, we have many teams of experienced engineers to work on the projects. In addition to drawings, we also provide project management and coordination as well as quality assurance, technical advice and support. Unlike others, we have profound knowledge in the field of structural analysis. Therefore, we can interpret the documents correctly and, if necessary, make suggestions for optimization or cost savings. We are your reliable rebar detailing consultant.


We are also willing to provide the static analysis along with the formwork and rebar drawings. Thanks to the efficient coordination between structural engineers and CAD/BIM engineers in our own office, we can offer you the entire service package with a favorable price.


The creation of formwork and rebar drawings is a demanding task. Therefore, a solid and structured system for quality assurance is crucial. Indeed, undiscovered errors in execution documents often lead to additional costs on the construction site. For this reason, every drawing in our office goes through at least two checking stages before delivery. Besides, all delivered drawings are documented, so the status and delivered date of the drawings are always traceable.


  • Formwork drawings
  • Rebar detailing
  • Position drawings
  • Load and load transfer drawings
  • Construction drawings in steel construction
  • And more


Adrian Grabara

Managing Director

M.Eng., Membership of Board of Engineers Germany, Registered Structural Engineer in Germany

Adrian Grabara is a co-founder and Managing Director of gbc engineers. He graduated from Beuth University of Applied Sciences in Berlin.

In the past, he worked for leading construction and engineering consulting companies. Mr. Grabara has diverse expertise and experience in civil and structural design, project and contract management for building, industrial- and infrastructure projects.

Daniel Bacon

Vice Director

Dipl.-Ing., Membership of Board of Architects and Engineers Berlin, Germany

Daniel Bacon is a co-founder and Managing Director of gbc engineers. He graduated from Beuth University of Applied Sciences Berlin.

He has over 10 years experience working in civil structural projects in Germany, Vietnam and Cambodia.  From 2011 to 2015, he was also a guest lecturer at Beuth University for reinforced concrete structures. Today, his focus is to lead engineering team to complete projects as well as train and develop the company’s engineers. 



Before the use of modern CAD software, drawings were created with ink. In comparison with modern CAD drawings, the hand-made drawing has many constraints. Firstly, they are more limited in display. Secondly, hand-made drawings had limited lines weight and the shading or even fillings were time-consuming. Moreover, texts and dimension lines of hand-made drawings took a lot of time to create and were, more or less, limited to a standard font. Another problem is that the hand-drawn spacing of dimension lines is prone to errors. Not to mention, changes in hand-drawn plans were only possible to a limited extent by scratching off lines on paper.

On the other hand, modern drawings created with computer offer a wide range of display options. Texts in many available fonts and highlighted cut areas with the use of thinner lines, colored lines, different shades of gray, fillings and shadings which offer a much clearer display. For instance, different concrete grades or waterproof concrete can be marked separately in the drawings. Moreover, the dimension lines can automatically detect the distance between two points in computer-based drawings. This helps avoid errors which usually appear in hand-made drawings. 

In the modern CAD-supported creation of reinforcement plans, the drawn lines are automatically defined and recorded by the program. Hence, keeping track of the bending list is no longer necessary now that the shape, the number of pieces and the dimensions of the rebar detailing are automatically transferred to the list. The bending list would also update all changes in rebar drawings.


BIM is on the rise, it is likely to be the new standard in the twenty-first century construction planning. In short, BIM is a database of information related to the  planned structure. In addition to the geometric data of the building which represents the essential data for the planning, information about material, manufacturer, cost, color, year of construction, etc. can also be stored in one database. However, BIM is often seen primarily in connection with a 3D model of the building.

The modern creation of formwork and rebar drawings starts first with the creation of a 3D model that represents the building geometry. Then, views, vertical and horizontal sections in drawings can be automatically derived from that 3D model. As a result, any sections can be generated from any building geometric with minimum effort. Besides, any changes in the 3D model are also automatically updated in the drawings. 

However, for display and labeling, sections of formwork and rebar drawings must be edited manually by the designer. For example, the automatically generated sections often contain a large number of hidden lines which are correct in terms of content but would lead to confusion if they remained on the plans.

The rebar drawings can now also be laid in 3-dimensional form. For this reason, sections and views can be generated from the 3D model of the rebar detailing, which update automatically whenever there are any changes. Ultimately, entering the reinforcement in 3-dimensional form enables you to check whether there are collisions between the bars. You can also check if the reinforcement is installed in all areas. This reduces the error rate in the reinforcement drawings.



Formwork drawings and rebar detailing serve as the basis for the reinforced concrete constructions and other material costs. Therefore, errors in the drawings usually result in additional costs. Beside the obvious errors such as incorrect concrete cover or wrong quantity, the neglect of structural engineering procedure can also lead to errors or obstructions. Notably, the so-called forced positions such as stirrups need careful attention. For instance, if a stirrup is installed at the edge of the slab, and engages in the outer reinforcement layer, installation would be severely hampered after the erection of the ceiling edge.

Moreover, the areas with multiple reinforcement layers and/or allowances in drawings must always be viewed critically. When using mats, the area of mat joints along with the concrete cover need proper checking. Economical and sensible laying must also be ensured, especially with mats. It is better to avoid large carpet remnants in reinforcement drawings. Furthermore, there should be no unnecessary cuts of the mat in reinforcement drawings. It is advisable to increase the size of the overlap mat instead of using a whole long or cross-section of the mat.

At gbc engineers, we pay great attention to quality control. All drawings are drawn on the basis of our own standards and also subjected to a multi-stage review process. A drawing approved by gbc engineers always requires verification and signature by the CAD/BIM engineer, team leader, QA engineer and project manager before being delivered.


gbc engineers GmbH is a modern and dynamic German engineering consulting company 


gbc engineers GmbH
Am Spreebord 9d, 10589 Berlin, Germany

Copyright © 2020 gbc engineers GmbH