Herrenknecht Formwork

Concrete placing systems in segment production

Figure: Herrenknecht Formwork

A spiked roller with 24 continuous spikes was used for concrete pouring at the City Tunnel Malmoe project

Figure: Herrenknecht Formwork

In Abu Dhabi a total of 100,000 segments were manufactured in a stationary production process with the aid of truck mixers for the lining of the about 40 kilometer long main sewer tunnel

Figure: Herrenknecht Formwork

The concrete distributor is either directly fed from the mixing plant or through a bucket conveyor, which is able to deliver the concrete at any part in the hall

Figure: Herrenknecht Formwork

The stationary concrete distributor is a reasonable start-up concrete placing system

Figure: Herrenknecht Formwork

The concrete distributor moves beneath the mixing plant to the casting zone, where it is picked up by a transverse traveling frame

Figure: Herrenknecht Formwork

To get the highest degree of flexibility and to manufacture a wide variety of segments at a circulation production line, customized distributors are installed according to specification, as for the project in St. Petersburg

Figure: Herrenknecht Formwork

The bucket conveyor ensures an efficient, logistic solution of internal concrete transport

Figure: Herrenknecht Formwork

Every tunnel project is unique in respect of the particular general conditions. Which driving and lining method is to be used is determined on the basis of a thorough evaluation of the same. Though the share of mechanically driven tunnel projects is more and more growing all over the world. If a constructor has taken a decision in favor of mechanical tunnel construction by means of TBM, the segment production has to be taken into account as well or he has to rely on the know-how of a precast concrete manufacturer.

In the last few decades, two different production methods have been developed,...