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    Civil engineering construction

Modernisation train station Wangen im Allgäu

Customer: DB Station & Service AG, Regionalbereich Südwest
Construction time: 11 months Year of construction: 2019
Accessible conversion of the train station in Wangen im Allgäu. Production of a pedestrian underpass with stairways and elevators. New interior and outdoor platforms, as well as bike parks and access ways to the station premises.


6-week shut down (only logistics runs). The stretch was electrified at the same time. Special proposal by LEONHARD WEISS, instead of a delay the pedestrian underpass was constructed in open construction method in a very short period of time. Exactly fitting formwork elements were used to speed up the works.


210 m² bulkhead system
530 m³ concrete
90 t steel
270 m sealings

Train station Merklingen

Customer: DB Projekt Stuttgart-Ulm GmbH
Construction time: 10 months Year of construction: 2019
In connection with the large project Stuttgart 21 the “Albhochfläche“ needs to be crossed in the area of the new line Wendlingen – Ulm in planning approval section 2.3. The new train station Merklingen was constructed here. It consists of two stair towers, a pedestrian overbridge, as well as two platforms.

Stair towers / bridge:

650 m³ reinforced concrete
100 t steel / bridge 35 t steel

Support structures:

630 m³ reinforced concrete
106 t steel

Renovation of fly-over, Nuremberg

Customer: Deutsche Bahn AG
Construction time: 7 months Year of construction: 2016–2017
Replacement structure for a fly-over of Deutsche Bahn. The line on top consists of 2 tracks, the line below of 1 track. Production of the entire structure in lying position, approximately 67 m away and about 2.13 m superelevated. The weight of the structure amounts to about 3,200 t. Dismantling of railway embankment incl. tracks and demolition of the old structure during shut down, preparation of subsoil, installation of the structure, backfilling and production of the superstructure and the tracks.


Extremely narrow construction space, not much storage space, difficult access, production in superelevated position lying on the side, shut down during eight days for dismantling, installation and reconstruction of the entire facility until the first train run.


1,500 m³ concrete
300 t steel (incl. prefabricated parts)
103 prefabricated slabs with a total weight of approx. 730 t
8,500 m³ excavated earth
1,000 m³ demolished concrete
7,000 m³ backfilling


8 m high
12 m wide
35 m long
67 m distance to construction site
2.13 m de-piling height

New line Wendlingen-Ulm PA 2.3 joint venture

New construction of a high speed line with 2 tracks

Customer: DB Projekt Stuttgart, Ulm
Construction time: 36 months (January 2015–December 2017) Year of construction: 2015–2017
Description: execution planning and complete creation of the infrastructure measure of a high speed line with 2 tracks with a length of 7.63 km (excluding non-ballasted track and equipment).
6 bridge constructions
2 tunnel constructions in open building method
underground rainwater retention basins
1 rainwater sedimentation tank
Production of 2600 m of supporting walls
Production of drainage pipes for the complete drainage of the line
Production of cuts and dams incl. all crossings of pipes
Installation of mast foundations for later electrification of line
Investigation and renovation measures in the karst region Schwäbische Alb


Steel approx. 20,000 t, concrete approx. 65,000 m3, water stops approx. 9,000 m, tunnel crossing A8 (motorway) (open construction method) 378 m, tunnel junction Merklingen (open construction method) 395 m. Bridge consisting of 5 elements on pillars with pre-stressed concrete prefabricated parts and in-situ concrete superstructure.

ABS Hanau-Nantenbach bypass Schwarzkopftunnel

Customer: DB Netz AG, Frankfurt
Construction time: June 2013–November 2015 Year of construction: 2013–2015
New construction of a bypass between Heigenbrücken and Laufach in connection with the upgrade of the railway line Hanau-Nantenbach. A total of 470 m supporting walls, between 4-11 m of height, 300 m pile head beams, 1,270 m through structures with walls up to a height of 13 m, 1,530 m tunnel in open building method, 2 railway and farm road crossings, two passages, as well as one stop station and the equipment of the entire bypass line were carried out. For these buildings a total of 120,000 m³ concrete and 20,000 t steel were used.

U12 Hallschlag - Aubrücke 3. section, Stuttgart

Customer: Stuttgarter Straßenbahnen AG (SSB / Stuttgart trams), Stuttgart
Construction time: 34 months Year of construction: 2013–2016
The construction site is located in the state capital of Stuttgart in the district of Münster. The construction site is partly located in the public transport sector. The 3rd section of the U12 tram line includes the realignment of the section from Hallschlag to Aubrücke. It begins at km 4 + 807.77 just after the Hallschlag stop (transition from section 2 to section 3) and initially runs along Löwentorstraße, then crosses under the freight bypass track and ends at the southern abutment of Aubrücke where it merges into the existing stretch of the U14 city tram line at 5 km + 918.5.

Concrete work around the Bottroperstraße stop, with sophisticated geometry and high requirements for architectural concrete quality. Construction measure during ongoing traffic in urban areas. Tunnel mined in sidewall drifts in challenging geology with shallow coverage.


Tunnel using mining and open trench, trough construction, bridge construction
23,900 m2 shotcrete
31 km securing materials (rods, anchors, pipe roofing)
24,800 m2 form work
22,650 m3 concrete
4,420 t reinforcing steel
11,400 m2 beam and sheeting construction

Jetway bridge East 2 Fraport, Frankfurt am Main

Quick connections for Germany's largest airport

Customer: Fraport AG, Frankfurt am Main
Construction time: 19 months Year of construction: 2009–2011
The north-west runway was built as part of the Frankfurt Airport expansion program. This was created to the north of the combined A3 motorway and ICE traffic routes between Frankfurt-Cologne and Airport Ring Fraport. The jetway bridges were built in order to cross the traffic routes. These are located in the east and the west. LEONHARD WEISS created the Jetway Bridge East 2, which spans the 4-lane Airport Ring Road at Frankfurt Airport, as an undercast transport route and the access to the runway for the aircraft.

The work was carried out with ongoing traffic on Airport Ring Road and on the adjacent Lufthansa Cargo premises.
The offsetting of preloaded pre-cast beams (length 25.50 m, weight 70 tons) was carried out in 3 sections under full closure of the Airport Ring Road with an 500 ton mobile crane.
Production of each of the 220 m long and up to 7 m high abutment walls in cycles of up to 16 m.
High requirements for dimensional accuracy of the reinforcement connections of the abutment wall and pre-fabricated section, which interlock at maximum intervals of 2 cm for the production of a flexurally rigid frame corner.
Continuous changes in the elevation of the abutment walls on opposite wall portions, in order to form the slope that results from the inclined gradient. This also had to be taken into account in the pre-cast reinforcement of the subsequent layer of concrete.
Manufacturing and commissioning of the jetway bridge section by section in accordance with the requirements in the "Directive on the execution of works in tunnel construction" after 80 m including all of the technical, fire-fighting and emergency equipment.

B 535, Schwetzingen-Plankstadt Tunnel

Demanding tunnel construction

Customer: Karlsruhe regional council, official headquarters in Heidelberg, Heidelberg-Wieblingen
Construction time: 18 months Year of construction: 2008–2009
As part of the road development for the B535 Schwetzingen-Plankstadt bypass, running the road in a tunnel near the overlying surface proved necessary.

The tunnel has two tubes: the "northern tube" with a length of 650 m and the "southern tube" with a length of 450 m. The internal width is 9.50 m per tube; the section lengths of tunnel blocks are generally 10 m
180 m concrete retaining walls in the connection to the tunnel
Operations building
Storm water detention tank with sedimentation plant
Backfill and overfill of the tunnel
Noise protection before and after the tunnel
Noise protection walls along the already constructed new L 543
Drainage facilities and complete road construction inside and outside the tunnel
Concrete 40,000 m3 (about 600 m3 per block)
Reinforcing steel 3,800 t