Notes on Docks and Dock ConstructionLongmans, Green, & Company, 1906 - 426 Seiten |
Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
12 feet 12 inches 20 feet 9 inches ashlar basin blocks bolt bottom caisson cast-iron centre chamber Chelura clay concrete constructed coping level cost cradle creosote cubic foot cubic yard culvert cylinder deck deposited depth of water diameter docks dredging driven Engineering entrance excavated face feet 6 inches feet long feet wide filled floating floor foot foundation gates girders graving dock greenheart ground harbour heel-post high water hole horizontal Ibid inches square inches thick inches wide inner iron length lifting lock low water low-water lower masonry material ordinary outer pipe placed pontoon Portland cement pressure puddle puddled clay pumps quay walls quoin removed rollers row of piles rubble sand SECTION sheet-piling ship shown by Fig side walls sill slipway sluices spring tides stone surface tidal tidal basin timber timber slide tons upper vertical vessel walings water-tight weight width
Beliebte Passagen
Seite 111 - A settlement of but ^ of an inch, after the backing had become thoroughly consolidated, would suffice to relieve the offsets of all vertical pressure from the superimposed earth, and the latter cannot therefore be properly considered as contributing to the moment of stability.
Seite ii - RAILWAY CONSTRUCTION. By WH MILLS, MICE, Engineer-in-Chief of the Great Northern Railway of Ireland. With 516 Illustrations and Diagrams. 8vo. , i8.r.
Seite 110 - On the other hand, with a porous subsoil at a lock entrance, the back of the walls may be subject, on a receding tide, to the full hydrostatic pressure due to the range of that tide plus the lateral pressure of the filling. Again, the water may stand at the same level on both sides of the wall, but may or may not get underneath it. If the wall is founded on...
Seite 386 - ... inches in diameter by 10 or 12 inches in length. If such a roll is sufficiently cohesive not to break on being suspended by one end while wet the tenacity of the material is ample. To test its power of retaining water one to two cubic yards should be worked with water to a compact homogeneous plastic condition, and then a hollow should be formed in the center of the mass capable of holding four or five gallons of water.
Seite 311 - ... shelter for the men close up to the bulwarks of the ship. The vessel is, in fact, brought bodily into the centre of a convenient workshop. It is taken to the smiths', or the carpenters', or the machine shops, according to the nature of the repairs required, and is moved easily from one to the other. " The number of vessels that can be thus docked is limited only by the number of pontoons, each pontoon constituting a separate and independent dock. The pontoons, which are all about 58 feet wide,...
Seite 110 - A dock wall is subject to far larger contingencies than an ordinary retaining wall, and the required strength will be included only within correspondingly large limits. Hydrostatic pressure alone may more than double or halve the factor of safety in a given wall. Thus, with a well-puddled dock bottom, the subsoil water in the ground at the back of the walls will frequently stand far below the level of the water in the dock, and the hydrostatic pressure may thus wholly neutralize the lateral thrust...
Seite 307 - The docking of a vessel consists of two distinct operations. First, the direct raising of the weight on the lift ; second, the transportation of the vessel to any convenient position for its repair on the pontoon. The lift is a direct mechanical appliance for raising the vessel by means of hydraulic presses. It consists of two rows of cast-iron columns, each 5 feet in diameter at the base, and 4 feet in diameter above the ground-level, and sunk about 12 feet in the ground.
Seite 310 - ... water passing back through the pipes to the presses where less pressure existed; the same difficulty would be experienced with two groups, however arranged. Stability is, however, secured by arranging the presses in three groups. One half of the whole number, occupying the upper half of the lift, form one group, consisting of sixteen presses. The remaining eight presses on one side form a second group, and the opposite eight form the third group. The presses in each group are all connected, so...
Seite ii - Medium 8vo., 2is. net CALCULATIONS IN HYDRAULIC ENGINEERING: a Practical Text-Book for the use of Students, Draughtsmen and Engineers. By T. CLAXTON FIDLER, M.Inst.CE Part I.
Seite 309 - The main girders are 5 feet 9 inches deep, of wrought iron trussed with a cast-iron top flange. The sectional area of each ram being 100 circular inches, a pressure of 2 tons per circular inch gives 200 tons as the lifting power of each press, or 6,400 tons for the whole lift ; but to find the available lifting power, there must be deducted 620 tons, which is the weight of the rams, cross head, chains, and girders, leaving 5,780 tons for the pontoon and vessel.