Steelwork for the KARMEN Upgrade

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The new layer of VETO counters, which will surround the KARMEN detector, will be installed within the 2 m thick walls and the 3 m thick roof of the KARMEN blockhouse. Thus a major part of the steel of the blockhouse had to be removed, before the frames with 2 and 3 modules respectively could be fixed to the remaining inner walls of the blockhouse.

The following pictures document the dismantling of the blockhouse, which took place during march and april 1996.

View into the experiment hall R55 at the Rutherford Appleton Laboratory. The blue cylinder in the middle is the steel shielding of the ISIS beam stop target, where the neutrinos are being produced. From left the KARMEN blockhouse looks into the hall, fully intact before the dismantling had started.
The blockhouse is built like a house of cards in shells of 18 cm thick, 1.7 m wide and up to 7.5 m high steel slabs with a weight of up to 20 tons.
The slabs were lifted with a crane one by one an manouvered along the side of the blockhouse. Behind the blockhosue, the slabs were brought to a horizontal position ...
... and loaded on a lorry. In total 4000 tons of steel have been removed and stored intermediatly.
The roof of the blockhouse consists of horizontal slabs, connected with the wall slabs by bolts. These bolts had to be removed. To do that, a hydraulically driven tool was used. Tilted bolts had to be drilled out.
The roof of the blockhouse, after all steel slabs had been removed. The far side of the picture shows the upper edge of the blockhouse door. In total the roof of the blockhouse and about half the thick of the walls were removed. Compare this picture with the one before the construction has begun.
The partly dismantled west wall of the blockhouse. The shell structure of the steel layers is clearly visible. The west wall of the blockhouse to the end of the dismantling.
Here you can see the 600 ton door, which can be moved to the side on a railway and then reveals the inner part of the blockhouse with the KARMEN detector. The upstream side of the blockhouse (towards the ISIS target). Not only one metre of the wall had to be removed here but also 1.15 metres of additional shielding against neutrons coming from the target.

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	View into the experiment hall R55 at the Rutherford Appleton Laboratory. The blue cylinder in the middle is the steel shielding of the ISIS beam stop target, where the neutrinos are being produced. From left the KARMEN blockhouse looks into the hall, fully intact before the dismantling had started.
	The blockhouse is built like a house of cards in shells of 18 cm thick, 1.7 m wide and up to 7.5 m high steel slabs with a weight of up to 20 tons.
	The slabs were lifted with a crane one by one an manouvered along the side of the blockhouse.		Behind the blockhosue, the slabs were brought to a horizontal position ...
	... and loaded on a lorry.		In total 4000 tons of steel have been removed and stored intermediatly.
	The roof of the blockhouse consists of horizontal slabs, connected with the wall slabs by bolts. These bolts had to be removed.		To do that, a hydraulically driven tool was used. Tilted bolts had to be drilled out.
	The roof of the blockhouse, after all steel slabs had been removed. The far side of the picture shows the upper edge of the blockhouse door.		In total the roof of the blockhouse and about half the thick of the walls were removed. Compare this picture with the one before the construction has begun.
	The partly dismantled west wall of the blockhouse. The shell structure of the steel layers is clearly visible.		The west wall of the blockhouse to the end of the dismantling.
	Here you can see the 600 ton door, which can be moved to the side on a railway and then reveals the inner part of the blockhouse with the KARMEN detector.		The upstream side of the blockhouse (towards the ISIS target). Not only one metre of the wall had to be removed here but also 1.15 metres of additional shielding against neutrons coming from the target.