Press reports
Three trenchless procedures in one project
The engineering firm De la Motte & Partner was entrusted with the planning and construction management of three special structures during the relocation of the "Zollvereinring" high-pressure natural gas pipeline. In addition to a mammoth find, there were several other special challenges that had to be overcome.
Speciallydesigned solutions reduce the impact on people and nature
The major Riederwald Tunnel project involves closing a 2.2 km gap between the A66 and A 661 motorways in Frankfurt.
Upgrading in the upper Baybach valley is progressing - third construction phase started recently
SONNTAG Bau is turning 90 this year. Over the decades, the company has evolved from a regional construction company into a full-service civil engineering provider with a focus on microtunnelling ...
The ecological reconstruction of the Emscher system is one of the largest infrastructure projects in Europe, scheduled to last several decades. SONNTAG has already completed many different construction projects for the Emschergenossenschaft (Emscher cooperative) in recent years thus helping to keep the Emscher free of wastewater. Once again, the construction company has been involved in the implementation of an extremely large and demanding construction project.
Model project from planning to building implementation
At a suburban railway station in Hamburg-Altona, a cable conduit system is being relocated under tracks over a length of 120 metres. During the planninng...
Pipe jacking DN 1000 - Strictly speaking, the pipe jacking in Datteln was a routine job for the SONNTAG construction company. However, the operation was quite special for the experienced jacking company: Installation of the jacking pipes Perfect Jacking Pipe Plus was a first for SONNTAG.
Infrastructure: Second construction phase in the future Newtonstraße completed / construction work ahead of schedule.
see press article: Heidelberg und Metropolregion, 20.12.2021
In Goddelau, the new sewer is laid underground, in consideration of the railway line / cost of 2.5 million Euro.
Sewer construction in the protected area, tunnelling work at more than 30 m depth, 580 large-diameter pipes - "Wolfsbachtal Sammler" collector is a real mammoth project.
From lofty heights to under water
In the course of a Germany-wide maintenance campaign, the Hans Martin Schleyer Bridge in Esslingen, built in 1964, is being replaced. Since the structure partly serves as a pipeline bridge for district heating, an alternative route had to be created before the demolition planned for 2021. EnBW decided in favour of a culvert under the Neckar to ensure a permanently safe connection between the banks and commissioned SONNTAG Baugesellschaft with this.
The Dortmund-Ems-Kanal is expanded. Among other measures, five new culverts are built.
see press article "Strassen- und Tiefbau" journal, October 2020
An XXL underground water parking
Esslingen: EnBW lays the new district heating pipeline before the demolition of the Hanns-Martin-Schleyer Bridge.
The challenge of changing geological conditions
Multi-million project enters final phase
The retention basin is well underway - work on the Hasenstraße is making fast progress.
In Triniusstraße in Bernkastel-Kues, the existing drainage pipes are being replaced by more efficient pipes. The work is the first stage of the three-year extension of Cusanusstraße.
An investment in the future.
No nonsense ground protection during pipe jacking
see newspaper article "Consulting engineers" - 05/06/2019
Arbeiten im Bruch haben begonnen
see newspaper article in the Bad Dürkheimer Zeitung - 18/05/2019
Mannheim. The connection of the Friesenheimer Insel (island) to the Mannheim district heating system is moving into the next phase: ...
Guess why this one's name is Marie-Polly?
Pipeline - A large milling machine is used to create a tunnel connecting the drinking water networks on the right and left banks of the Rhine.
Tunnel construction for the first drinking water pipeline - The pioneers of the Rhine
see press article, Sonntag Express, 22 April 2018
Untertürkheim: A 180 metre long relief sewer was implemented in a jacking process from AWO Waldheim up to TBU.
For the construction of the Circulago energy network, the Isabelle drill head has been digging its way from the Aabach roundabout in Zug towards Lake Zug since September. It reached the Schützenmatt destination shaft near Seeufer yesterday.
Saarlouis. Around 200 pipes are being laid underground in Saarlouis for a new main collector.
Saarlouis. The Saar Waste Disposal Association (EVS) is proceeding with the sewer construction works in Saarlouis to build a new main sewer.
Pipe jacking in Osnabrück
The traditional company from the Hunsrück employs 400 people.
Koblenz. The old dam is being redeveloped and reinforced, and the pumping station renovated: around 3,7 million euro are to be invested in the eighth and last section of the flood control for Lützel, Neuendorf and Wallersheim within 24 months ...
Marienfels. In April, redevelopment work is to start on the Mühlbachtal wastewater treatment plant in Marienfels. At an on-site meeting, VG works manager Ralf Solinski discussed planning with the assigned companies...
Water pipes were installed in Bogenstraße by means of pipe jacking. Town councils came to inspect the construction site ...
Municipal works are installing new waste water pipes in Bogenstraße - in an unusual fashion.
On 24 August 2016, in the context of a press event with owner/client MAINOVA and having created a crossing under 36 rail tracks, SONNTAG was able to lift its AVND 2500 pipe-jacking machine from the target pit.
Local residents praise the construction process on Villiper Hauptstrasse. The company is to finalise works by March 2017.
Siehe Presseartikel, General-AnzeigerIn the city, all the pieces fit! There are several reasons why it took six months less than anticipated, according to lead civil engineer Peter Esch: "We were working with a particularly professional construction company; we had the best site manager available to the Civil Engineering Office for Sewer Construction; and we had the perfect conditions for carrying out the works. With a less professional company or under less favourable conditions in terms of underground, such projects can look very different."
Bingen-Rhine crossing construction site in the trade publication "bi-Umweltbau".
Cologne Rhine culvert construction site in the trade publication "bi-Umweltbau".
The Head of the Kreuznach waste water company is particularly full of praise for the SONNTAG company in Bingen, which has been entrusted with reconstruction of the sewers. Due to SONNTAG stepping up operations, the scheduled date for completion - namely, the annual fair - will certainly be met, assuming nothing unexpected happens in the meantime.
Source: Rhine-Main press, July 2015
Praise for the company - Full of praise are "Jopp", members of the local advisory board and citizens for the company engaged by the town this time. It works speedily. "If we had had this company from the beginning, we would be much further today", said the place abbot.
"Rhein-Main-Presse", May 2014
Exact on the millimeter: The four tons heavy steel construction is put into the underground weir structure with tact. Everything worked out perfectly.
Danny Thom, project manager of SONNTAG Baugesellschaft mbH, Hönow and Udo Salzwedel, dept. Planning and Building Berliner Wasserbetriebe, are satisfied with the installation.
The trenchless construction of an aircushion culvert under the rivers Enz and Nagold commissioned by the municipal sewage Pforzheim (ESP) was awarded two prestigious national and international prizes. Executing building contractor of this 16 million euro project was the company SONNTAG Baugesellschaft. The branch office in Bingen was responsible for pipe jacking of 1400, 1600 and 2200 diameter tunneling pipes and provided the engineering work, as well, all from a single source.
First of all, the “Enz” culvert earned the "Big Project and BGreen Award" in the category "water conservation“. The prize is is awarded in Dubai every year in honour of special construction projects in the areas of "engineering" and "sustainability".
The second prize was the GSTT Gold Award for outstanding trenchless construction projects. For SONNTAG Baugesellschaft it was already the third GSTT award as a project partner. “Remarkable achievements, with which we have made a beautiful Christmas present to ourselves”, as the SONNTAG corporate group responsives commented on the prize awarded in early December at the sanitary engineering conference "Dortmund Sanierungstagen".
The GSTT Award is presented by the "German society for trenchless construction and maintenance of piping” [Deutsche Gesellschaft für grabenloses Bauen und Instandhalten von Leitungen e. V.], in order to highlight innovative engineering and heighten awareness of the potential cost savings as compared with open-air construction. Not least of all, it’s about environmental issues, because underground pipe-jacking allows for greater conservation of natural resources.
Information about the picture:
The proud winners at the award ceremony in Dortmund: 1st from the right:. Branch office manager Bingen Alfons Bongard, 2nd from right – signing clerk Iris Sonntag, 3rd from the left: Chief engineer Bingen Bernd Seis and representatives of the city of Pforzheim and engineering consultants.
Quelle: Rhein-Zeitung, Dezember 2011
Project Enzdüker: A heavy drill head of 36 tons milled himself 485 meters through the rock under the river Enz
"We are thoroughly satisfied with the previous development of the work", explains site supervisor Mrs. Becker. Yesterday she celebrated the breakthrough of the 485 meters tunnel at the starting place theater street together with 25 construction workers and engineers.
Nature conservation: Dörther company in action
Until the visitors' centre opens, there is still a lot of "underground work" to do. These highly demanding stabilisation, foundation and concrete works will be executed by the Hunsrück specialist civil engineering company SONNTAG, situated in Dörth on the A 61. In addition to the actual fish pass above and below the weir, the team will be erecting a structure for an additional water turbine.
Source: Rhein-Zeitung, August 2011
Margit Conrad, Environment Minister, Dagmar Barzen, President of "Struktur- und Genehmigungsdirektion Nord", Felix Stenschke, Head of Shipping Subdivision, the Mayor, Dr. Eberhard Schulte-Wissermann and Professor Dr. Hofmann-Göttig break ground for the new fish pass.
The construction costs for the entire project at the Moselle weir, Koblenz, will be around 5.5 million euro. This includes a visitors' centre and systems for fish monitoring that are to be completed by the National Garden Show in 2011.
Source: Blick aktuell, April 2010
Channel construction work: Most extensive building measures in the civil engineering of the last decades proceed according to schedule.
First town-councillor Martin Ringhof is very satisfied with the course of the most extensive building measures of the last decades. Up till now we could accomplish the set goals without problems and also keep the time and particularly the budgeted costs ".The instructed company has done good work.
At night-time specialists set up a new railroad crossing bridge. Strong floodlights illuminated the more than 22 meters high drilling machine. That was used in the Urfttal and controlled by a 28 years old female building assistant.
SONNTAG carries out the renovation of the walls on the “Konrad-Adenauer-Shore”
…the first step is the renovation of the side walls. The lowering of the previous wall is part of it between “Stresemannstraße” and “Rheinkavalier” by one meter. This makes the stairless way to enter the Rhine shipping fleet easier for persons in wheelchairs or families with baby carriages in the future. The existing wall must, however, be protected from slipping between “Rheinkavalier” and “Deutschem Eck”. A technically demanding job. A bored pile wall with a 1,600 tons heavy ridgepole must be set up under the surface of the water - exactly the right thing for SONNTAG.