A Treatise On The Principles And Practice Of Dock Engineering

74 DOCK ENGINEERING. comnet Î O ^g oarefully Ievelled- After the waP is end h / cantilever plece8 are sawn off, and if the appearance of the ^.^îfl +Tlghtly’they are cut °ut of the wall for an inch or two and the face floated over. ré™!” thet 8eTd 7th°d ^ 39) long timber uPright« Rangea at a 7 17 VA each side °f the UprightS is a gr°°^> within which mould can slide up or down as required. When raised to each fresh position, it is temporarily secured by wooden wedges. « case the surfaoe °f a concrete mould° should be coated with a suitable oil, or greasy preparation, to minimise adhesion. Elg. 39.—Concrete Mould supported by Standards. Block-settmg Appliances.-For the purpose of dealing with massive con- crete blocks, used for construction in exposed situations, two types of apphanees are generally employed, known by the generic titles of (^ and litan respectively. The Goliath, is an overhead traveller, with rectilinear motions The frame, consisting of two vertical sides connected by an upper horizontal platform, travels backwards and forwards upon two lines of rails at the ground level. The platform supports a track for the transverse motion of 777 machlne- The Seneral fonction of a Goliath is the removal of the blocks from the moulds, in which they have been formed, to the stacking ’ 7 ldustratlon of one is gi™ in fig. 40, which represents a 42-ton steam Goliath, constructed by Messrs. Ransomes & Rapier, of Ipswich for harbour work at Dover. The span of the main girders, which are 138 feet over .11 .. 100 ^ 1} Inch«. belw..„Cerltr„ „f— way is 25 feet, while the total lift is 120 feet. The speeds of the various movements are :-Lifting, 10 feet; crab travel, 50 feet; main travel, GO feet per minute. The weight of the machine in working order is 216 tons.* The Titan is also an overhead traveller, but on the cantilever principle 77^77 Of rota7 as we11 as rectilinear motion- Its fonction 7 ta .6 77oo7?oni the yard and deposit them in their places. The earlier tyP® ?f. Tltan did not possess the turning movement, but this latter is very useful in setting apron blocks alongside the main work. The Mormugao *Engineering, September 29, 1899.