1. ESS Concrete Pit Lids

2. Pit Lids Context

3. Pit Lids Context
This is the Maintenance Cell, which has a number of pits in.
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4. Pit Lids Context
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5. Pit Lids Context
Only the Storage Pit Lids are made from concrete, these are what we are interested in
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6. Pit Lids Context
This image shows all of the Pit Lid Sections, as Pit Lid A is replicated across all. The next slide shows each in closer detail.
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7. Pit Lid Variants
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8. Pit Lid Construction
4mm cladding stainless steel (304 or cheaper)  increase to 12mm
50mm base plate stainless steel (304 or cheaper)
Grapple Interface (Stainless (304 or cheaper)) with tie rods to base plate
Heavy concrete (Magnadense equivalent) internal
Rebar design similar to as shown
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9. Questions 4mm and 12mm cladding (most probably 12mm)
How much will removing the need for formwork reduce our costs/time (likely)?
Manufacturing Considerations
Do you think it is possible to assemble the rebar, mount onto base plate and weld up the cladding around it, before pouring the concrete?
Is there a different way it could be manufactured?
Is there a different design construction which may aid our costs?
How might we simplify the manufacture?
How might we arrange the rebar in the top shelf appropriately, allowing overlap with the longitudinal rebar?
How might you suggest assembling in the grapple interface
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10. Rebar construction Check void requirements
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11. Studding details
We are considering a set of studs along the base to increase corner strength
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