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Tunnel Luise Kiesselbachplatz Munich

construction method:  cut-and-cover construction method, tunnel central walls, trough construction

company: „Arge Ingenieurbau Tunnel Luise Kiesselbach Platz“

year: 2013-2015

description

The tunnel is constructed in cut-and-cover method and has a length of 1.53 km, running from the northern tunnel portal at the end of highway A96 along the “Garmischer Street” southwards to “Luise-Kiesselbach-Platz” located at the end of the highway to “Garmisch-Partenkirchen”. For a short distance of 400 m the driving lanes between “Luise-Kiesselbach-Platz” and “Högelwörtherstreet” will be directed through an open trough with sound protection walls at both sides, followed by another 620 m long tunnel construction running eastwards from “Heckenstallerstreet” to “Passauer-Street”. 

The walls are poured in two sections due to the fact that the height of each center wall is different. The concrete of the first few meters of the center wall, that is up to 4.0 m height, is poured and compacted conventionally from above with the help of internal vibrators. In a second step the formwork for the wall section below the ceiling is set up. In this case, it is no longer possible to use internal vibrators, so that compaction can only be achieved by help of external formwork vibrators.  

The Mooser pneumatic vibrators type VR* reach their nominal speed at once by switching on the air supply and they quickly pass through the critical resonance frequency of the formwork. A quick acceleration of the vibration and an almost lossless transmission of vibrating energy to the concrete results in excellent concrete surfaces and in great concrete compaction depths. The external vibrators are mounted onto the mounting clamp type STA including formwork specific adaptors for the H20 formwork girders. Thanks to the adaptor-pair the vibrators can be attached to the formwork in a way that is optimized for vibration and gentle to the girder. The concrete compaction of the walls with a height of 1.50 m and thickness of 60 cm is completely done by one single row of vibrators, which are mounted onto only one wall-side of the formwork. 

At the walls of the lateral tunnel sections with a thickness of 90cm, which are partly running from the main tunnel in direction to the A95 highway, the external vibrators are clamped onto a single-faced Meva Mammut formwork. In order to mount them onto the Meva Mammut formwork joint, the adapter-pair for the H20 girder simply has to be replaced by the adapter-pair for the Meva Mammut formwork joint.

An air compressor and a central air distributor provide the necessary air supply (air volume and air pressure) for the vibrators. With help of the air distributor one single person is able to operate all connected vibrators one after another and is able to compact the concrete all by his own. 

For the concrete compaction of the tunnel technique rooms, Mooser vibrators are mounted onto a Streif Light aluminium formwork. The wall thickness that has to be compacted is 60 cm – 90 cm. The little weight of 12.5 kg of the vibrating unit, consisting of the vibrator and the STA clamp is a great advantage, if vibrators are to be relocated onto the formwork according to the pouring process. Relocation of this pneumatic vibrators is a quick process. It takes about one minute per vibrator. Furthermore the construction-site saves additional costs by relocating the vibrators, instead of having them all mounted onto the complete formwork face.

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