tremie

In constructing the piers for a masonry arch bridge in France in 1888 much the same method was followed, except that a wooden tremie 16 ins. square made in detachable sections was used.

Concrete Construction Methods and Costs Halbert Powers Gillette

~ -- A tremie consists of a tube of wood or, better, of sheet metal, which reaches from above the surface to the bottom of the water; it is operated by filling the tube with concrete and keeping it full by successive additions while allowing the concrete to flow out gradually at the bottom by raising the tube slightly to provide the necessary opening.

Concrete Construction Methods and Costs Halbert Powers Gillette

The tremie used to deposit the concrete was a tube 14 ins. in diameter at the bottom and 11 ins. at the neck, with a hopper at the top.

Concrete Construction Methods and Costs Halbert Powers Gillette

A good example of a sheet steel tremie is shown by Fig. 33.

Concrete Construction Methods and Costs Halbert Powers Gillette

This tremie had a hopper top and was also provided with a removable cap or cover for the bottom end, the latter device being intended to keep the water out of the tube and prevent "washing" the first charge of concrete.

Concrete Construction Methods and Costs Halbert Powers Gillette

Still another example of tremie work is furnished by the task of depositing a large mass of concrete under water in the construction of the Nussdorf Lock at Vienna.

Concrete Construction Methods and Costs Halbert Powers Gillette

This tremie was used by Mr.Wm. H. Ward in constructing the H.rvard Bridge foundations and numerous other subaqueous structures of concrete.

Concrete Construction Methods and Costs Halbert Powers Gillette

Another method of handling a tremie was employed in constructing the foundations for the Charlestown Bridge at Boston, Mass.

Concrete Construction Methods and Costs Halbert Powers Gillette

The caisson was then filled with concrete through the tremie which was handled by a traveling crane.

Concrete Construction Methods and Costs Halbert Powers Gillette

Then a special mixture of Portland cement and other ingredients that allow concrete to cure under water will be poured on the canal bottom to form a "tremie slab."

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