This section is from the book "Cyclopedia Of Architecture, Carpentry, And Building", by James C. et al. Also available from Amazon: Cyclopedia Of Architecture, Carpentry And Building.
The piles for constructing the new sea-wall at Annapolis, Md., ranged in length from 70 feet to 110 feet. On the outer end of the breakwater, piles 70 feet to 85 feet were used. These piles were in one length, single sticks. Toward the inner end of the breakwater, lengths of 100 feet to 110 feet were required. Single sticks of this length could not be secured, and it was therefore necessary to resort to splicing (see Fig. 59). After a trial of several methods, it was found that a splice made by means of a 10-inch wrought-iron pipe was most satisfactory. When the top of the first pile had been driven to within three feet of the water, it was trimmed down to 10 inches in diameter. On this end was placed a piece of 10-inch wrought-iron pipe 10 inches long. The lower end of the top pile was trimmed the same as the top of the first pile, and, when raised by the leads, was fitted into the pipe and driven until the required penetration was reached. The piles were cut off 4 1/2 feet below the surface of the water, by a circular saw mounted on a vertical shaft.†
Fig. 59. Section of New Sea-Wall, Annapolis, Maryland.
*See Engineering-Contracting, February 19, 1908.
†ProceecUngs of the Engineers' Club of Philadelphia, Vol. XXIII, No. i