Start of Perfect Production at Bonna Sabla / France

Custom-made Large Manhole Bases

Fig. 1 DN 1500 Perfect monobases mold equipment.
Abb. 1 Formen für Perfect-Schachtunterteile DN1500.

Fig. 2 A crane handles the two large molds at the Bonna Sabla site.Abb. 2 Die beiden Großformen von Bonna Sabla werden mittels Kran manipuliert.

Fig. 3 Several tonnes are lifted when the unit is turned into its final installation position. One worker is responsible for the complete process.
Abb. 3 Mehrere Tonnen werden beim Wenden in die spätere Einbauposition
bewegt. Ein Arbeiter ist für alle Abläufe verantwortlich.

Fig. 6 The crane removes the external mold shell.
Abb. 5 Die Außenform wird mittels Hallenkran abgenommen.

Fig. 4 The shape of the element is created by the bottom ring and the wall thickness reducer.
Abb. 4 Formgebend sind sowohl der Muffenring als auch die Wandstärkenreduktion.

Fig. 6 The EPS channel is taken out when all mold pieces have been removed.
Abb. 6 Nach dem Entschalen aller Formenelemente wird das
EPS-Gerinne entfernt.

Fig. 8 The tried and tested cutting technology is also used for large elements.Abb. 8 Auch für großformatige Elemente kommt die bewährte Schneidetechnologie zum Einsatz.

Fig. 7 Manhole base with partially reduced wall thickness.Abb. 7 Schachtboden mit partiell reduzierter Wandstärke.

Fig. 9 The negative channel has already been pre-assembled
in the mold.Abb. 9 Das Negativgerinne ist bereits in der Form vormontiert.

Fig. 10 The manhole base has been completely demolded; it is ready for transport.Abb. 10 Das Schachtunterteil ist komplett entschalt und fertig für den Abtransport.

Fig. 11 At the storage area at the Lamotte factory of Bonna Sabla: manhole bases ready to transport.
Abb. 11 Auf dem Lagerplatz von Bonna Sabla in Lamotte: Schachtunterteile fertig zum Abtransport..

Fig. 12 In Lamotte are manufactured also these special octagonal elements.
Abb. 12 Auch in Lamotte werden diese Achteck-Elemente produziert.

 The French Bonna Sabla group of companies is a member of EuropeanConsolis Group and one of the leading European precast producers. Due to the great product diversity offered by the French group, customers are provided with comprehensive solutions for all building and infrastructural projects. Consolis operates more than 130 factories in 25 countries. In 2008, the 10,000 employees of the group generated net sales of approx. 1.7 billion euros. Bonna Sabla became a member of the group in 2005. This long-established French brand is also very successful in the currently difficult market environment. We visited the Bonna Sabla production site in Cuise-Lamotte.

History of Bonna Sabla

At the end of the 19^th century, Bonna was founded by Aimé Bonna, the inventor of the “âme-tôle” pipe (pipe with steel-sheet inner liner). Already at that time, processes were developed to supply the mobile construction sites in France and the neighboring countries. Roughly at the same time, the corporate history of Sabla began – a business that specialized in the production of precast products.

In 1924, the state-owned water utility CGE (Compagnie Générale des Eaux), which was the most important customer of Bonna at the time, bought the business. The company was renamed...