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Southport Deep Shaft
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| Service: | NATM design and construction supervision
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| Location: | Southport |
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| Technical data: | 9 m (29.5 ft) excavated dia. 80 m (262 ft) deep vertical shaft for sewage treatment. Upper 28 m (92 ft) of shaft excavation supported using diaphragm walls with the remaining 52 m (170 ft) excavated using NATM with a reinforced shotcrete primary lining. Permanent lining comprises slipformed reinforced concrete. |
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| Geology description: | Beach Sand overlying Mercia Mudstone overlying Halite (rock salt). |
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