Bucket pointed vault, half dome and segmental vault

This room has been built above the present office of the Auroville Earth Institute and is the bedroom of Satprem Maïni, director of the Auroville Earth Institute.

Bucket pointed vault, as the bedroom for the house of Satprem Maïni

Bedroom with a half bucket pointed dome
This vault combines the difficult stability of a pointed arch and bucket one. The stability requirements between a vault and a dome for this kind of shape are different: The vault requires a bottom thickness of 36.5 cm, which decreases till 11.5 cm at the top, and it needs a keystone of a specific weight. But the dome can be started with only 29 cm thickness, which reduces progressively till 7 cm at the apex, and it does not need any keystone.

This arch shape has been used for doing apses of a rectangular room, which has been covered with a segmental vault.

The segmental vault was built with vertical courses. The bucket pointed vault and dome presents these features:
•    2.42 m span, 2.42 m rise, 1.65 m long, 29 to 7 cm thick for the dome and 36.5 to 11.5 cm thick for the vault.
•    They have been built free spanning with horizontal courses

>Laying the blocks of the arch on the window frame as a centring
Laying the blocks in the corner and puling the string line
Puling the string line to check if the block of the arch is well laid
Building the arch symmetrically
Puling the string line and checking the block of the archs
Building the arch symmetrically
Completing the arch

Laying the last blocks above the arch
Removing the window frame, used as a centring
Starting the bucket pointed vault

Laying blocks of the bucket pointed vault
Laying a triangular mortar
Stability limit with the horizontal courses
Laying the first keystones
Laying keystones
Completing the vault
Vault completed
Starting the dome with 29 cm thick blocks
Building the dome
Completing the dome
Half dome completed
Starting the segmental vault

Laying stepped courses of the segmental vault
Laying blocks above the string lines
Segmental vault in progress
Joining the segmental vault with the adjacent vault
Joining the vaults
Gap left for ventilation

Coping for the waterproofing, before laying the ferrocement cover
Completing the segmental vault on the other side

Bucket pointed vault completed

Bedroom (Bucket pointed vault) living room (equilateral vault)
Bedroom from inside

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