2nd Main Line Munich: Drilling Technology for Compensation Grouting Around Marienhof Station

1 Entrance structure to the new Marienhof Station with platform tunnels, the connecting tunnel and the compensation grouting screens Credit/Quelle: ARGE Marienhof
1 Entrance structure to the new Marienhof Station with platform tunnels, the connecting tunnel and the compensation grouting screens
Credit/Quelle: ARGE Marienhof
2 Sleeve pipe and double inflatable packer Credit/Quelle: ARGE Marienhof
2 Sleeve pipe and double inflatable packer
Credit/Quelle: ARGE Marienhof
3 Site plan showing the grouting screen beneath the buildings and the first test area outlined in red Credit/Quelle: ARGE Marienhof
3 Site plan showing the grouting screen beneath the buildings and the first test area outlined in red
Credit/Quelle: ARGE Marienhof
4 Detail from the 3D model of the excavation pit (Captions from top to bottom: building view from below, well gallery, shallow foundation with compensation grouting screen, depth measurement point, deep foundation with compensation grouting screen) Credit/Quelle: ARGE Marienhof
4 Detail from the 3D model of the excavation pit (Captions from top to bottom: building view from below, well gallery, shallow foundation with compensation grouting screen, depth measurement point, deep foundation with compensation grouting screen)
Credit/Quelle: ARGE Marienhof
5 Layout of the grouting screens (red) to the west of the access structure Credit/Quelle: ARGE Marienhof
5 Layout of the grouting screens (red) to the west of the access structure
Credit/Quelle: ARGE Marienhof
6 Geological cross-section (west-east) of the new access structure [2] (fill = white; quaternary gravels = yellow; tertiary clays/silt = purple; tertiary sands = orange; compensation grouting screens = green lines) Credit/Quelle: ARGE Marienhof
6 Geological cross-section (west-east) of the new access structure [2] (fill = white; quaternary gravels = yellow; tertiary clays/silt = purple; tertiary sands = orange; compensation grouting screens = green lines)
Credit/Quelle: ARGE Marienhof
7 Modified Bohrtec BM 600 LS jacking machine Credit/Quelle: ARGE Marienhof
7 Modified Bohrtec BM 600 LS jacking machine
Credit/Quelle: ARGE Marienhof
8 Illustration of the ratio between the sleeve pipe (black inner circle) and the bore diameter (blue) Credit/Quelle: ARGE Marienhof
8 Illustration of the ratio between the sleeve pipe (black inner circle) and the bore diameter (blue)
Credit/Quelle: ARGE Marienhof
9 Comparison of cement consumption in jet grouting (22 000 t cement; left) and compensation grouting (50 t cement; right) [1] Credit/Quelle: ARGE Marienhof
9 Comparison of cement consumption in jet grouting (22 000 t cement; left) and compensation grouting (50 t cement; right) [1]
Credit/Quelle: ARGE Marienhof
10 Mass balance of soil disposal Credit/Quelle: ARGE Marienhof
10 Mass balance of soil disposal
Credit/Quelle: ARGE Marienhof
11 Drilling fluid circulation and fluid treatment Credit/Quelle: ARGE Marienhof
11 Drilling fluid circulation and fluid treatment
Credit/Quelle: ARGE Marienhof
12 Top view of the first test field (outlined in red) Credit/Quelle: ARGE Marienhof
12 Top view of the first test field (outlined in red)
Credit/Quelle: ARGE Marienhof
13 Overview of the second and third cycles of preparatory grouting (second cycle = blue, third cycle = orange) Credit/Quelle: ARGE Marienhof
13 Overview of the second and third cycles of preparatory
grouting (second cycle = blue, third cycle = orange)
Credit/Quelle: ARGE Marienhof
14 Overview of the compensation grouting phases Credit/Quelle: ARGE Marienhof
14 Overview of the compensation grouting phases
Credit/Quelle: ARGE Marienhof
15 Relationship between injected volumes and the resulting elevations (orange line = hose scale reading, blue line = cumulative grouting volume [l]) Credit/Quelle: ARGE Marienhof
15 Relationship between injected volumes and the resulting elevations (orange line = hose scale reading, blue line = cumulative grouting volume [l])
Credit/Quelle: ARGE Marienhof
16 Example of a valve‘s pressure-flow diagram (green line = pressure [bar], blue line = flow rate [l/min]) Credit/Quelle: ARGE Marienhof
16 Example of a valve‘s pressure-flow diagram (green line = pressure [bar], blue line = flow rate [l/min])
Credit/Quelle: ARGE Marienhof

The central access structure to the new Marienhof Station on the 2nd S-Bahn Main Line is being built using the diaphragm wall/top-down construction method. With five bracing levels and a depth of 42 m, this will be the deepest excavation pit in the centre of Munich. From the excavation pit at Marienhof, the platform tubes of the station and a connecting tunnel to the existing U3/U6 underground railway line are being driven under compressed air. To secure the buildings and to mitigate possible settlements, the buildings and the existing tunnels above the platform tubes to be constructed, are bolstered with a compensation grouting screen.

1 Scope of the Compensation Grouting Work

Sensitive existing buildings and tunnels are located within the area of influence of the platform tunnels to be constructed. To the east of the excavation pit lies the imperial residence “Alter Hof”, Munich’s oldest building complex. There are also numerous high-value buildings around the Marienhof. The existing tunnels of the U3/U6 subway line run in close proximity to the access structure and at a short vertical distance from the platform tunnels to be constructed; these tunnels will continue to be used under normal operating conditions throughout the...

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tunnel 02/2026

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tunnel 02/2026

Ressort:  Injektionstechnik | Injection Technology
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Dipl.-Ing. JOACHIM MEIER, Fachbauleitung Hebungsinjektionen/Expert Compensation Grouting, ARGE Marienhof/JV Marienhof, Implenia Civil Engineering Gmb, München/Munich, Deutschland/Germany

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