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Too clever by half

Most interesting feature on the temporary works for Rhymney Bridge (NCE 24 April).

Much of the thrust concerned how the horizontal component of the concrete load was dealt with.

Unless I am sorely mistaken, concrete subject to gravity exerts only a vertical force. If the pin-ended struts had been themselves vertical, then there would have been no need for the complexities described. – First year statics!

Of course, the reaction from the sloping construction joints would have a horizontal component, but even this could have been eliminated by making them horizontal.

DAVID TEAL (M), Aeolus Partnership, Ashford Kent,

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