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flat jack

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flat jack [¦flat ¦jak]
(civil engineering)
A hollow steel cushion which is made of two nearly flat disks welded around the edge and which can be inflated with oil or cement under controlled pressure; used at the arch abutments and crowns to relieve the load on the formwork at the moment of striking the formwork.


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After experimenting with serrated and non-serrated jacks we selected a flat jack.
Simmons is affectionately known as Flat Jack by the cricketing fraternity because of his style of bowling.
Flat Jack, in his first full summer as Old Trafford chief, saw them lift the AXA League title to add to the NatWest Trophy they collected at Lord's on Sunday.
 
 
 
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