Canadian engineer . drive woodenor concrete piles to rock on account of the sunken timbers,boulders, &c., which were indicated by the borings andafterwards removed through the air chamber of the caissonswithout going to such expense that there would be very littledifference between the cost of the pneumatic caisson andthe less reliable foundations. The owners, therefore, decided to use caissons and ac-cepted the tender of the Foundation Company for thirty-fourcircular caissons to be carried to bed rock for the lump sumof $82,500, which sum included the engine and boiler roomsand coal pocket wa
Canadian engineer . drive woodenor concrete piles to rock on account of the sunken timbers,boulders, &c., which were indicated by the borings andafterwards removed through the air chamber of the caissonswithout going to such expense that there would be very littledifference between the cost of the pneumatic caisson andthe less reliable foundations. The owners, therefore, decided to use caissons and ac-cepted the tender of the Foundation Company for thirty-fourcircular caissons to be carried to bed rock for the lump sumof $82,500, which sum included the engine and boiler roomsand coal pocket walls, floor, &c., below the curb are 15 caissons of 6 6 diameter3 6 10 7 7 6 8 8 o or 34 in allThese caissons all had a steel working chamber, sidesand roof, ^^-inch thick. The concrete being started on the top of the roof ordeck, was built up about 20 feet at a time inside of remov-able circular metal forms. As soon as this concrete had sethard, excavation and sinking would be started and carried. Fig. 3. Showing operation on November 15, 1910, also con-crete mixer. S steel Form or shell removedbefore sinking. C Wooden Cofferdam. On until the top of the concrete had nearly reached the sur-face of the ground when the men would be taken out andplaced elsewhere while another build up of concrete wasbeing put on. The pumping of compressed air had to bekept up of course all the time; the necessity for which wasshown when the gauge tender allowed the air pressure tolower, which resulted in the air chamber being filled withSand to the deck when the cutting edge ran away, of?which more will be said later. The working shaft for men and material was alsoformed by collapsible shafts which, however, were left inplace until the sinking was finished and the air chamber had been filled with concrete, so that nothing but concretewas left from the deck to the base of the column base orgrillage. The concrete was made of one part of Portlandcement, three parts of sand, and five parts o
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
