As of: February 8, 2024, 8:25 a.m
By: Nicole Kalenda
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The model building in the background is the subject of the eighth subway comic, presented by (from left) Dimitri Steinke (PMG), Mayor Hermann Nafziger, Michael Brucker (PMG) and Robert Bauer (Leonhard Weiss).
© Michael Schönwälder
One year after the groundbreaking ceremony, the shell construction work is in full swing: the extension of the U 6 from the Großhadern Clinic to Martinsried is taking shape - and is on time and within budget.
Martinsried
- A good two thirds of the 800 bored piles have been driven into the ground, the course of the tunnel is clearly visible, and at the western end the first wall formwork for the gable wall of the future train station is standing: "It's unbelievable what has already happened," said Planegg's mayor Hermann Nafziger on Wednesday at the subway construction site in Martinsried.
The reason for the press event: It was just the first anniversary of the groundbreaking ceremony for the extension of the U 6 from the Großhadern Clinic to Martinsried.
The ceremonial act with Prime Minister Markus Söder and Science Minister Markus Blume on February 6, 2023 was the initial spark for tunnel construction after months of preparatory work.
In the meantime, the approximately one kilometer long construction pit is no longer being excavated, but the concrete work has begun.
In the west, where the hole widens to up to 50 meters, the concrete floor slab has been completed and the reinforcement for the walls has gone up.
The operating rooms for the subway will be built here; there will be no parking facility.
“We save ourselves that,” said Planegg’s managing director Stefan Schaudig.
The subway trains will continue to be parked at the Großhadern Clinic.
Model building 5.7 meters high
The future platform is located to the east.
The sample block in the southwest next to the pit gives an idea of what dimensions the structure will have when the walls and ceiling are finished: there is a kind of concrete gate 5.7 meters high and five meters wide.
The actual structure will be 17 meters wide, but the pattern provides plenty of opportunity to practice.
It is important to implement the architects' specifications regarding the quality of the exposed concrete, says Robert Bauer, project manager at Leonhard Weiss.
The letters L and W are stamped into the walls as a test for the later Martinsried lettering.
A cell-shaped stamp is embedded in the ceiling.
“This creates an artistic acoustic design for the wall,” says Bauer.
The architecture firm Gruber + Popp won the design competition in 2021 with a subway station that evokes associations with cell structures.
“It’s a challenge from a concrete perspective,” says Bauer.
There should be no horizontal joints, but there should be a vertical one every two meters.
An unsightly spot was also created so that we could practice “cosmetizing the exposed concrete,” says Bauer.
In two years, when the subway station is built, the model block will be demolished again.
On average, 40 to 60 people work on the construction site.
Leonhard Weiss GmbH & Co. KG from Göppingen is the main contractor for the shell construction.
The Hohenwart company A. Wöhrl is responsible for the specialist civil engineering trade, and Gebrüder Klarwein GmbH from Weßling is responsible for the earthworks.
Porr takes care of groundwater conservation, Bavaria Blitzschutzbau takes care of building grounding, Geiger takes care of canal construction.
The Turkish company IMKO, a contract company, took over the concrete and reinforced concrete work.
Additional trades and companies will be added until completion.
Backfilling begins in the middle of the year
“We are building and the implementation planning is underway at the same time,” explained Dimitri Steinke, Managing Director of U-Bahn Martinsried Projektmanagement GmbH & Co. KG (PMG).
On behalf of the municipality of Planegg as the building owner, PMG is responsible for the implementation of the large-scale project.
The individual construction phases are divided into blocks, each of which is submitted for approval.
“At some point this year we will have the shell of the station,” said Steinke.
Whenever a sufficiently long section has been completed, the excavation pit is filled in at this point.
In the west, backfilling is scheduled to begin in the middle of the year.
Gravel is used that comes from the excavation pit itself.
“We think from two sides,” explained project manager Bauer.
“We hope that we can get to the Klopferspitz in the west.
We're starting in the east and want to make it halfway to Klopferspitz." That would mean that three quarters of the tunnel shell would be finished by the end of the year.
Leonhard Weiss is still building the track, then the company will move away and others will come to take care of the operating technology.
In the area of the Am Klopferspitz street, the tunnel structure using cover construction has now almost been built on the right and left; the roadway is expected to be temporarily relocated to the west side in March in order to be able to build the tunnel under the street.
Then traffic there will only be possible in one lane with traffic lights.
The roadway is scheduled to be moved back in August.
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“We are within the deadline, time and cost framework,” says PMG managing director Steinke.
It's not easy because the route partly runs through a backfilled gravel pit.
“There are always geotechnical questions that we have always solved so far.”
The work is scheduled to be completed in 2027; net expenditure for the construction of the route is estimated at 212 million euros. The federal and state governments will cover 95 percent of the eligible costs.
The municipality has to raise 8.4 million euros including management costs.