Laying Concrete under Water.

Progress, Volume VI, Issue 4, 1 February 1911, Page 553

Laying Concrete under Water.

The question lias proved very interesting in Wellington, on account of the failure of the Fry Dock contract. The practice of laying one rote under water is, however, not new. In papers and discussions before the Institution of .Municipal Engineers, at Brighton, England, the subject of laying concrete under water was introduced. It was stated that satisfactory results had keen obtained by depositing dry concrete in hags and letting the water do the rest. Mr. A. E. Puller stated that the foundations of the groynes on the Brighton front were made in this way, and that after fourteen or fifteen years there was no sign of any ill effect; and Mr. A. E. Prescott gave similar testimony with regard to the con-

struction of sea defence ' works, and the carrying of sewers out to sea. He had deposited hundreds of tons of cement in the sea, in that manner, with success. Mr. B. A. Miller, on the other hand, had experienced some difficulty owing to the displacement of the bags of cement by rough weather. In making a breakwater, lie had dropped hundreds of tons of dry cement in bags into the sea from a hopper barge. He then went down in a diving dress and found that many of the bags lay a little out of place.