Casing circuit
Concrete and reinforced concrete sleepers are produced in large numbers, mainly in shuttering circuits, which are plants in which the shuttering runs around in a circuit and have a curing chamber with shelves or stacks in which the precast concrete parts are cured. The advantages as opposed to stationary production are the markedly higher productivity and the associated reduction in costs.
A basic distinction is made between two production procedures:
1. Immediate shuttering removal:
Here, the sleepers are removed immediately from the sleeper shuttering after the concreting, meaning that the concrete hardens outside the shuttering. With prestressed concrete sleepers, the prestressing strands are applied and prestressed in the sleeper after drying has been completed.
2. Late shuttering removal:
Here, the concrete dries while still in the sleeper shuttering. With prestressed concrete sleepers, the prestressing strands are applied and prestressed before the concreting and compaction processes. After the drying process, the prestressing strands are detensioned and the tension is applied to the sleeper as a result.
Your contact
for shuttering circuits
Steffen Schmitt
Tel. +49 (0)7134 52 239
Fax +49 (0)7134 52 205
steffen.schmitt(at)vollert.de
Pictures in use
References
March 2010
Sleeper factory for Manufacturing Monoblock LVT
Tribeton® - a brand name belonging to Creabeton Materiaux AG in Switzerland – wished to change their monoblock production method from conventional to self-compacting concrete. Eltecna AG, Zürich, and Vollert Anlagenbau GmbH, Weinsberg, (Germany) gained the contract to develop and supply a new circulation system for manufacturing sleepers. In essence, the LVT (Low Vibration Track) monoblocks for the Gotthard base tunnel are to be manufactured with this system.
December 2004
Production of prestressed concrete sleepers using the late removal of shuttering
On the basis of an internal study carried out in 2002 that investigated all the current options available on the market for the production of prestressed concrete sleepers in terms of economy, quality and the use of energy, Leonhard Moll Betonwerke chose at the end of 2002 a system for the production of prestressed concrete sleepers using the late removal of the shuttering. Here, the experience of Moll, which had already produced several million prestressed concrete sleepers in the past, was combined with the plant engineering expertise of Vollert. The result is a plant that sets new standards worldwide with regard to economy, quality and energy consumption.
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