The Megalith Movers Prehistoric Engineering
continued: Erecting A Trilithon    With the stone still resting on it's support logs and now in the correct position at the bottom of the stone-hole it becomes a simple matter to start lifting the top end of the support logs along with the stone using a crib built under the top end as in the pic below: This is a pic of a crib that we used for the Obelisk erection.    After the crib has been raised to the right level, the fulcrum log is laid in position and a working platform or scaffold is provided at the same level for the lever men. The top of the megalith is then levered up by degrees and packing is inserted between the support logs and the sloping side of the stone-hole. This packing will resist any lateral force exerted by the megalith as it is inserted between the sloping ground and the sloping megalith. While the crib will transfer the downward pressure during each lift directly to the ground.    As the megalith will be starting at an angle of 30 degrees we should be able to continue in this way until we reach an angle of perhaps 60 or 70 degrees. The sloping side of the stone-hole will help greatly in this respect.    See sketch below:    With the Stonehenge upright now at an angle approaching 70 degrees it becomes a simple matter to tie the support logs into the packing and continue with the erection, by placing he fulcrum log across the support logs and levering from this until the upright stands at 90 degrees.    With both the Trilithon uprights standing in the right place secure in their stone-holes, all that remains to be done to complete erecting a Trilithon is to place the 10 ton lintel on top.    Lifting a Trilithon Lintel to the same height as the uprights would be a very easy matter using levers and a a simple crib, however transferring the lintel from the crib and into place on top of the uprights is a little more problematical as the crib requires the weight of the lintel pressing down on it to keep it stable.    A practical solution to this minor problem would be to build the crib in such a way as to utilise the Trilithon uprights as a means of stablising the crib. This can be done by laying the first layer of the crib timbers through the gap between the uprights as well as on each side of the same, and laying the second layer on top of and at right angles to the first layer both in front of and behind the uprights, as well as lashing the different layers together.    See sketch below:  A birds eye view    The lintel stone is placed in front of the uprights and lifted a few inches at a time while the different layers of the crib are slid underneath. When the underside of the lintel has risen above the top of the uprights the levers are used to row the lintel into it's final position and the crib is eventually dismantled. As always the lever men are provided with a separate working platform or scaffold that rises in conjunction with the lintel stone. return to top of this page

Megalith Movers - Building Stonehenge:

Megalith Movers -
Raising an Obelisk video 1:

Hapshetsut Obelisk - Erecting A Trilithon Or Stonehenge Upright Erecting A Trilithon Or Stonehenge Upright
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