BS Maritime works – Part 3: Code of practice for the design of shipyards and sea locks. BS Code of Practice for Maritime Structures – Part 3: Design of Dry Docks, Locks, Slipways and Shipbuilding Berths, Shiplifts and Dock and Lock Gates. stru ctu res. Simo n. B u rch ett. BS and the Eurocodes. Simon Burchett. Associate Director. 1. Dealing with Waves and Coastal Structures.
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All types of intermediate gates should be arranged so that the prestressing tendon are susceptible to stress underfloor pumping is maintained for the whole corrosion cracking and should be adequately floor at all times. For limit state analysis, normal continuous throughout the life of the dock so that loading conditions should be multiplied by a partial the ground water regime surrounding the dock can load factor of not less than 1.
Most types of pumps can be entrances. 63449-3
If 6349–3 order to incorporate some or all of the above, conditions are present it will be necessary to consistent with an acceptable structural design of maintain the top of the borehole tube at a level at the dock wall.
If the walls is given in clause 51 and with respect to rate of pumping required to maintain this condition gravity walls in clause 52 of BS Provision continuous, thus producing a platform of rigid should be made to transmit the horizontal forces construction. These pumps drive soleplate to be used.
The care should be taken to ensure that the subsoil maximum draught of a ship able to use the shiplift conditions are suitable for load bearing piles. In particular, the cranage different. Small drainage pumps Pumphouses for dry docks are usually located near drawing from low level sumps are often vertical the dock entrance but consideration should be given shaft machines for similar reasons.
It is the constant aim of BSI to improve the quality of our products and services. Under-drained dock floors are those which provide i by floors bearing directly on the ground for the ground water below the floor to be pumped see 2. The jets so formed help to disperse accordance with 2. The present state of knowledge of stress when one part of the floor is inadvertently flooded corrosion cracking and hydrogen embrittlement of due to downward leakage from an intentionally highly stressed steel in concrete is such that the risk flooded part.
In this reinforcing steel. The allowable stresses under and the affect of waves as described in 6. Every precaution should be taken against flooding Secondary meshes should be constructed in sections of the pumphouse, as this can cause the dry dock to and secured in place by a simple retaining system to be put out of action for a very long period.
The spacing between blocks distributed load on the carriage, which increases in is related to the size of prefabricated units used to total as the ship loses buoyancy. Depending on the ground conditions, concentrated loading from ships may be carried by the following 2.
If the used, in addition, as dry docks and therefore are lock is to be used as a dry dock, reference 634-3 be fitted with some of the features of dry docks such as made to 2.
Valves screen being fouled. The height of blocks may range dock gates are supported by internal inclined struts, from 1. Compressed air may be used to expel water from 6. Overview Product Details What is this standard about? On the other hand, simple operation of equipment, such as dock arms, dimensions of length, breadth and depth can be travelling along 6439-3 face of the dock walls.
BS Maritime works. Code of practice for the design of shipyards and sea locks
Transverse or side transfer from the platform to the 5. Piles are usually used for this purpose, and blocks when the shiplift is at its lowest position. Code of practice for planning and design for operations BS Where two winches are required design should be either wholly in accordance with to work together, they should be synchronous or BS bx wholly in accordance with BS These cleaning pumps will need to operate in parallel with the main ballast pumps and, possibly, under automatic control.
Earthing conductors should be output connections; adequately sized to carry maximum prospective 3 a generator with mechanical motive power currents without overheating or excessive voltage e.
The siphon valve commission without seriously affecting the has then to remain closed as the pump is stopped operation of a dry dock. A drained floor is normally cheaper than a gravity or ba down structure. Some systems employ two winches situated at the Yaw horizontal rotation of the arm and elevation of dock head, each with one trolley.
Dock and lock gates 6. If the soil is of high permeability and the types of floor may be used to resist uplift from continuous pumping of ground water would be an ground water: The loading may preferably be restricted to b t with an upper limit thus be represented by two or more line loads for the of 40 t.
Blocks made wholly of timber Softwood cappings have traditionally been used on should be fully tied down to the floor to prevent top of blocks as make-up pieces to produce a level floating.
Good reliability is essential and maintenance diesel engine is normally provided to operate the should be as simple as possible. As such, conformity with its recommendations is not obligatory and variations from its recommendations may well be justified in special circumstances and engineering judgement should be applied to determine when the recommendations of the code should be followed and when they should not. The spacing of the grid not usually carried out. The movement of bss carriages together link up with horizontal rails on land whereby the with the ship thereon is usually controlled by ship can be transferred to shore see Figure The motor will require impounding of the dock is not contemplated but protection from forward energization when running may be difficult to maintain leak free if used in reverse and vice-versa and protection from where the water pressure tends to unseat the reverse energization when windmilling above slide.
Vertical adjustability strength and stiffness transversely. All pumps will be rotodynamic i. Mixing of ba drainage system be maintained in capacities would increase the total cost. Design of dry docks, locks, slipways and shipbuilding berths, shiplifts and dock and lock gates.
If such luminaires are used it is strongly recommended to augment the lighting with some tungsten or fluorescent lamps suitably disposed to prevent any area becoming completely dark. NOTE Working stress methods for the analysis of reinforced and unreinforced concrete and for the calculation of crack widths In some cases, notably when the dock is on rock of were previously given in CPwhich is withdrawn.
The maximum provide clearance to the superstructure and top lift of the jib cranes is normally arranged to be at a hamper of any ship likely to be built 639-3 the dock radius extending at least to the dock centre line with should be provided at the dock entrance.
General criteria; — Part 2: During the docking The platform should be fitted with safety rails and manoeuvre the stern of the vessel is controlled by toe boards. Each siphon is fitted with a siphon breaker valve which de-primes the siphon to prevent backflow The use of hydraulic models to investigate the best when pumping ceases.
Whilst there are no absolute form a major part of the total cost of some gate limitations, there may, for instance, be a practical designs see 6. Due to the three-pinned arch design of the structure It may be advantageous to have a wide area on only of most large goliath cranes, the loadings on the two one side of the dock, in which case, the possible crane legs are often not similar and provision for effect of stanchion loads on one or both dock walls shear is taken only on one side.
Damage to faces and seals reinforced concrete is not easy to repair and The accuracy required in the construction of corrosion of the reinforcement is difficult to meeting faces on the sill and quoins is related to the overcome.
This may cause a sudden application of loads, which should 634-3 considered in the design.