Find the most up-to-date version of BS at Engineering BS Maritime Works – Part 5: Code Of Practice For Dredging And Land Reclamation. BRITISH STANDARD BS Maritime structures — Part 5: Code of practice for dredging and land reclamation BS Committees.
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BS Maritime works. Code of practice for dredging and land reclamation
One Trial dredging should also be employed in situations disadvantage is that refusal may occur on, for where there is no satisfactory conventional soil example, a thin bed of shells or equally unimportant investigation method that is capable of sampling the feature. To a in rocks. The degree of accuracy that can be achieved is greater for those dredgers that are positively located by spuds than for those dredgers that are relatively free in their movement, particularly trailing suction hopper dredgers, in which there is no positive mooring system and the dredger is moving continuously while dredging.
Any assessment of quantities at the design stage of dredging works has to take account of the additional quantities that will arise from overdredging. Accuracy 649-5 echo sounder record in waves or swell can be improved by using filters and swell compensators.
The navigation, dependence on barge loading, which range of materials that can be dredged economically reduces its suitability for land reclamation or filling without pretreatment is very limited. This is particularly important when considering the quantities that have to be disposed of, especially if that disposal is to an onshore containment area.
It may be For granular materials, deposition should be well necessary to restrict the hours of discharge to a outside the limits 634-5 the natural side slopes of the particular state of tide, usually the ebb.
BS Code of practice for dredging and land reclamation_图文_百度文库
NOTE 1 Sea bed resolution is based on the paper width, which is normally mm 5 in per channel. When Ba bed level is normally determined by measuring the sea bed is soft or disturbed, as may occur the depth of water above the sea bed and subsequent to and during dredging, accurate simultaneously recording the sea level close by, measurement is difficult and particular care is relative to an appropriate datum.
In the bz where the existing water depth is shallow, the dredger may have to create sufficient water depth from which it can operate.
Information on weathering is extremely important from a For dredging assessment, the strength range within the descriptive dredging point of view, and it is suggested that a descriptive term is rather large and therefore it is very important that when scale of weathering bw relates to the breakdown of the rock giving descriptive terms the test results should also be provided.
NOTE 4 Determination of the maximum and minimum dry density is also recommended. Exceptionally, when the limiting density has been decided, measurement dredging close alongside quays or jetties, of the depth at which that density occurs may be particularly in shipbuilding areas, the sediments made either by means of a lead line see 2.
Guidance on selection of dredging plant 5.
This may be particularly true upon the completion 6439-5 dredging in areas of fine sediments, such as silts, clays and fine sands, since at this time the surface deposits may be in a semiliquid state.
Sea bed levels have to be known before dredging work can be properly planned and quantities estimated.
Most of the sampling and investigation procedures have been derived from land-based Whoever undertakes the work it is of prime importance that the work is supervised by techniques. The performance of the dredger and of the dredged formation should be properly monitored throughout the trial and key parameters should be preselected and carefully recorded during execution. For small survey areas such sophistication is not normally justified, but for the repetitive survey of large areas positive benefits may result.
Admiralty charts are prepared for navigation rather than for engineering purposes. The amount of investigation also depends on the size of the area to be dredged. Some techniques have been adapted and are under further development for well-qualified and experienced geotechnical engineers or engineering geologists and that underwater operation on the sea bed using a diver or using remote control from the the field work in particular is undertaken by skilled drilling crews with well-maintained surface.
Publication 8, March  Int. Bbs size of bucket provide the necessary reaction to the digging force employed depends upon the nature of the material and both slew to discharge the bucket into a barge to be dredged and the maximum dredging depth. In this adequate information is not available and should be clause, only matters of special relevance to dredging obtained by means of a site investigation.
The level of accuracy and the shore control requirements will then be consistent throughout. A scale sb 1: However, there are many factors that can affect this.
In these situations, the longest acceptable interval between dredging determination of navigable depth may be difficult programmes. In expense of reduced production and hence increased weak soils, the vertical face of each dredged step unit costs. There are few dredgers that are able to dredge 634-5 a depth of 30 m.
The unpredictability described in 5. Boreholes are too small in diameter to allow satisfactory recovery of samples.
Approval from the responsible authority may be required under the Control of Pollution Act when dredging is proposed in close proximity to areas of habitation, or where noise is considered important and conditions are such that the suspension of significant amounts of fine materials, perhaps with toxic content see 3.
The coarser the sub sea bed materials, the greater is the energy absorption and the lesser the penetration.