FREE BOOKS

Author's List




PREV.   NEXT  
|<   6   7   8   9   10   11   12   13   14   15   >>  
the contractor's yard at Bridgeport, and were towed across the Sound on a scow. They were set up and braced temporarily by the derrick boat, and then the floor and deck were constructed in place. On December 26th, 1909, a storm of unusual violence--unequaled in fact for many years--swept over the Sound from the northeast; the waves beat over the pier and broke loose some floor planks which had been only tacked in position, but otherwise did no damage, and did not shift the caissons in the least. The same storm partly destroyed a pier of substantial construction less than a mile from the one in question. Unfortunately, the work was let so late in the summer, and the restrictions as to seasoning the concrete were enforced so rigidly, that the work of setting the caissons could not be commenced until November 11th, thus the entire construction was forced into the very bad weather of the late fall and early winter. As this involved very rough water and much snow and wind, the work was greatly delayed, and was not completed until the middle of January. The cost of the entire dock was about $14,000. The writer believes that the cost was much less than for masonry piers by any other method of construction, under the existing circumstances of wind, tide, and exposure. It would seem that for many highway bridges of short span, causeways, and similar structures, the use of similar caissons would prove economical and permanent, and that they might be used very largely to the exclusion of cribwork, which, after a decade or so, becomes a source of constant maintenance charges, besides never presenting an attractive appearance. Finally, in bridges requiring the most rigid foundations, these caissons might readily be used as substitutes for open wooden caissons, sunk on a prepared foundation of whatever nature, and still be capable of incorporation into the finished structure. DISCUSSION WILLIAM ARTHUR PAYNE, M. AM. SOC. C. E. (by letter).--On the arrival of the first barge load of brick, to be used in building a residence on the estate to which this pier belongs, a severe northwest wind blew for two days, after the boat was moored alongside, directly against the head of the pier and the side of the boat. The effect on the pier was to crush the fender piles and cause a settlement of one of the caissons at the pier head on the west end. The caisson was knocked slightly out of alignment, and a settlement toward the
PREV.   NEXT  
|<   6   7   8   9   10   11   12   13   14   15   >>  



Top keywords:

caissons

 

construction

 
entire
 

bridges

 

similar

 

settlement

 

Finally

 
appearance
 

wooden

 

attractive


presenting

 

readily

 

foundations

 
substitutes
 
requiring
 

economical

 

permanent

 
structures
 

causeways

 

highway


contractor
 

largely

 
constant
 

maintenance

 

charges

 

source

 

exclusion

 

cribwork

 

decade

 
finished

alongside

 

moored

 

directly

 
belongs
 

severe

 
northwest
 
effect
 

slightly

 

knocked

 
alignment

caisson

 
fender
 
estate
 

residence

 

DISCUSSION

 

structure

 

WILLIAM

 
ARTHUR
 
incorporation
 

capable