Document ID: chunk:federal_register_of_legislation:F2013L01343:front:0:p56
Version: federal_register_of_legislation:F2013L01343
Segment Type: other
Provision Reference: 
Character Range: 144270–147108

any changes that may occur as a result of ice removal, such as increased vibration.

These factors will continue to be monitored during the life of this plan. A review of the structural integrity of the Main Hut will be undertaken during the life of this plan, taking into account the over-cladding and ice removal.
Magnetograph House

The Magnetograph House is substantially intact and the interior is free of ice and snow. The building is thought to be structurally sound and in good condition. This building will also be subject to a structural assessment during the life of this plan.

 Transit Hut and Absolute Magnetic Hut – Standing ruins

Following the fitting of the portal frame to the Transit Hut in 2010/11, the structural capacity of the hut has improved considerably. The Absolute Magnetic Hut is in a poor condition and wall cladding is thin and continues to be abraded by the harsh weather conditions. Both huts are managed as standing ruins (see Section 2.9.4). Any future stabilisation works that may be required to either hut will be based on the outcome of a full structural assessment during the life of this plan.

2.7.3 Corrosion of Metal Connectors

Godden Mackay Logan (2001) notes that:

   All timbers in the framing of the Main Hut have bolted connections, and cladding was originally fixed with plain mild steel nails. The bolted connections are generally in good condition, showing only minor surface corrosion. Inspection and, where necessary, replacement of bolts and nails will become necessary over time. Apart from the loss of cladding, failure of bolts or nails is the event most likely to lead to significant damage to the buildings.

Since 2002 external and internal corrosion rates have been monitored using bimetallic CLIMAT bolts and copper/steel coupons. Its combination with environmental data has allowed conclusions to be drawn regarding corrosion rates in different parts of the Main Hut and the impacts of snow and ice removal and over-cladding the roof of the Main Hut on the internal micro-environments. Corrosion rates are dependent on the types of micro-environments associated with particular areas such as the ice-free darkroom, Mawson's cubicle and more open areas. Preliminary data indicate that corrosion rates may have increased slightly in some areas following the over-cladding of the living quarters. Preliminary data following over-cladding indicates that changes in internal corrosion rates are variable, with slight increases in some areas but concurrent decreases in other areas. Further analysis of corrosion data is required before firm conclusions can be drawn. Additional monitoring, especially in walls and ceiling, is also recommended.

2.7.4 Ice and Anchorage

The relative contribution to the foundation strength of the Main Hut of 50 t of rocks placed around the