Kemroc helps demo contractor renovate school

When the renovation process of a school in Germany including replacing the building’s façade, the reinforced concrete shell could not be removed by hand.

Kemroc EX 60 HD milling attachment Kemroc’s EX 60 HD milling attachment in operation at the Giesssen-West primary school. (Photo: Kemroc)

As a result, construction and demolition company Leinweber rented a Kemroc EX 60 HD milling attachment for its excavator. With this combination of equipment, the building’s outer shell was removed “with precision and many times faster” than would have been possible by hand.

The Giessen-West primary school in the state of Hesse is being thoroughly rebuilt and renovated.

The aim is to bring the building, which was built using a reinforced concrete skeleton construction in 1971, to modern functionality and energy standards. To do this, the building had to be taken back to an empty shell. After gutting out the building, the next task was to remove the reinforced concrete façade.

This consisted of a 4 cm (1.6 in) thick insulation panel sandwiched between two layers of reinforced concrete, one 6 to 7 cm (2.4 to 2.75 in) thick and the other 15 cm (6 in) thick.

In the original plan, the first step was to release each individual panel from their supporting anchors by hand and then lift them off with a crane. However, this turned out to be impossible. The contractor, Willi Leinweber Transport, decided to try removing the outer shell using a hydraulic excavator with a surface milling attachment. The dispatcher Jens Bayer therefore rented a Kemroc EX 60 HD surface milling attachment to match the company’s own large excavator.

The Kemroc EX range of surface milling attachments is used to repair asphalt or to mill horizontal, vertical, or inclined concrete and screed surfaces. The attachments have mechanical or hydraulically adjustable depth adjustment. This makes it possible to mill defined layers with millimeter precision. Milling drums can be equipped with different tooling, depending on the material to be milled.

The range of services offered by Leinweber who are based in Fulda in Hesse, include demolition and earthworks, transport as well as recycling and raw material extraction. For the project at the primary school building in Giessen, Kemroc sales manager Enrico Trender in consultation with dispatcher Jens Bayer decided to use an EX 60 HD surface milling attachment with concrete chisels for use on the company’s own large excavator as the carrier vehicle. With this combination of equipment, it was possible to detach the outer concrete shell from the insulation layer as required and to dispose of the milled material.

Civil engineer Thorsten Staaden, project manager for Herzig Architekten at this public funded renovation project, said: “The entire façade area was around 1,500 sq m (16,145 sq ft) in size. The excavator was able to reach around 1,000 sq m (10,763 sq ft) of the façade without dealing with obstacles, and in this area the removal rate was certainly ten times faster than conventional manual work.”

A major advantage was the ability to remove layer-by-layer and separate the materials for disposal as well as creating low levels of dust.

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