. Engineering and Contracting . Cofferdam Frame on Ways Ready for Launching. also made at each end of each pier position and a core re-moved to a depth of 20 ft. into the rock. The depth of water at these pier locations varies from 24to 35 ft. at mean low water, the average tide being about Floods in this river are not frequent, are of short durationand seldom raise the water level more than 6 ft aboveM. L. W. The method of constructing these piers was given mostcareful study and it was finally decided to build them in opencofferdams. These cofferdams are timber frames surroundedby stee
. Engineering and Contracting . Cofferdam Frame on Ways Ready for Launching. also made at each end of each pier position and a core re-moved to a depth of 20 ft. into the rock. The depth of water at these pier locations varies from 24to 35 ft. at mean low water, the average tide being about Floods in this river are not frequent, are of short durationand seldom raise the water level more than 6 ft aboveM. L. W. The method of constructing these piers was given mostcareful study and it was finally decided to build them in opencofferdams. These cofferdams are timber frames surroundedby steel sheeting sealed to the rock bottom. The timber (78) Engineering and Contracting for March 24, 1920. 333. Ji_U;j_,J J y^ij jl^ HOTE e INDICATES BORING MADE WITH CALVX COPE DRILL ^3 frames were erected on the Virginia sliore upon launching-ways. They are 103 ft. long. 45 ft. wide and 24 ft. deep, andcomposed of three longitudinal trusses 101 ft. long and 24 , separated by series of 12 by 12 timbers, and two end-trusses 45 ft. long and 24 ft. deep, all connections beingthrough-bolted. The reason for trussing these frames was togive them greater rigidity and prevent any chance of distor-tion in handling them from the ways to their location in theriver. These frames are supported upon nine shoes about 12 , 3 ft. wide and 2 ft. high, each furnished with two setsof cast-iron rollers connected by steel axles. The rollers turnin grooves cut in the bottom of the shoes and drop off as thpframe leaves the ways. They are later recovered and usedagain under the next frame. The rollers run in 7-in. chan-nels spiked to the timber-ways. The shoes also functionwhen the frame is in place
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