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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Suction methods should be avoided if possible.
BS Maritime works. Code of practice for dredging and land reclamation
See section 4 of BS Moisture is most readily released when the surface area of the deposit is large relative to its depth. NOTE 5 Silts often contain 63349-5 appreciable amount of clay particles, which have a strong influence on the soil characteristics. Strength and structure may vary considerably in horizontal and vertical directions.
Usually the cutter The main pontoon structure contains the dredge suction dredger works with one of the types of pump sthe main engines and all ancillary engines, anchor that secure a hold by penetration into the sea drives and equipment.
The more common form of construction of a cutter To achieve optimum performance the draghead suction dredger is that of a rectangular pontoon should be selected according to the type of material see Figure 14although the very large cutter to be dredged and the dredger being used suction dredgers may be ships. On occasions, it may nevertheless be sensible Important decisions concerning plant selection to employ the trailing suction hopper dredger if hs should where possible take 63349-5 of the full range bulk of the dredging requirement is well-suited to of site conditions and requirements.
For example, a small proportion of indicate a considerable content of cobbles and boulders. Dutch and see note 2 see note 3 Swedish Rocks Best method of NAa Useful for Cores represent Cutting in drill fluid Used only in NA NA Useful to obtaining core obtaining core undisturbed may be used for soft or establish the samples of samples of samples of intrinsic identification of weathered likely geology intact rocks in in limited rock non-recovered layers rock and in over a large situ condition penetration corals area.
One consists of a series of buckets, blades incorporate integral sockets for the which are widely spaced around the driving wheel mounting of a variety of types of replaceable 63449-5 Figure 16and the other consists of closely teeth. Such measures can land are subject to the control and provisions of the include the use of a synthetic filter membrane.
The apparent velocity recorded between any two hydrophones is the velocity of propagation in the stratum from which that energy has been refracted. The composition of laboratory provided, but if grading curves are not given or are limited samples can also improve the estimation of the boulder content.
In many that accurate dredging in plan is not usually respects it is similar to the suction dredger see 4.
BS Code of practice for dredging and land reclamation_图文_百度文库
However, it is thought that agitation dredging may be environmentally unacceptable in many locations. For engineering purposes, a suitably detailed survey should be made. Upon receipt of the licence, the licensee may carry out prospecting in the area 3.
The air-lift b see Figure 26 for method of The amphibious dredger is generally small and may loading achieves flow in a pipe by the injection of be capable of working in water that is too shallow for compressed air at the submerged extremity of the conventional craft.
The magnitude of the maximum if necessary. Table 6 and Table 7 of that publication Whenever possible, a full grading curve should be b Composition of laboratory samples.
Click to learn more. Investigation procedures Most of the sampling and investigation procedures have been derived from land-based techniques. These is of more rugged construction and greater power advantages are mainly confined to the suction and than plant of the same type designed specifically for grab hopper types 6349-55 to very large 6349- suction maintenance work. Any dredged formation which intercepts the passage of mobile deposits will be exposed to potentially heavy rates of siltation and therefore high maintenance costs.
If fracturing is sufficiently close and open, pretreatment may not be necessary.
A judgement may be necessary at the design stage 3. This can be done by regular ditching at very close centres creating a corrugated section to the deposits. Generally, the permission of the land and the ns of that owner will be required.
If fracturing is sufficiently whether, or how, rock can be dredged, with or close and open, pretreatment may not be necessary. Such measures can include the use of a synthetic filter membrane.
For example, Every description of soil should contain some indication as the boulder content of tills i. It is intended principally for use in respect of dredging operations that involve the use of floating plant, although many of the recommendations apply to the use of plant operated from the land. Design of inshore moorings and floating structures; — Part In fine soil, the engineering behaviour is better related to The probe is unlikely to encounter cobbles or boulders if they only a description that takes account of marked influence of the occur to a minor degree.
These in turn For those dredgers that discharge to barges, it is depend on the amplitude, period and direction of the essential that movement of the barges be assured at waves or swell. Unless the area in which prospecting is to take place is sensitive, the issue of a prospecting licence is reasonably quick and uncomplicated. The issue of a production licence within 6 months is unusual and, in sensitive areas, the time required may well extend to 2 years or more.
Journal for Rock be matched with uniaxial Mech. It is unwise to locate disposal areas close to populated areas, particularly when populated areas are downwind of the disposal areas. Sands are not necessarily restricted to quartz sands but may include lime sands, iron ores, etc. Each type of dredger may be affected in a different way, as follows. NOTE 2 If finer sediments than sand are anticipated, expect more penetration, better resolution and less power needed to penetrate the sea bed.
Some aspects of particular dredging tasks or 5.
If convenient, the topsoil material can achieved. Side-scan sonar also provides a useful method for determining the satisfactory completion of dredged channels. Undisturbed and disturbed samples of soil, particularly core samples of cohesive materials, should be protected from loss of natural moisture. The ladder is mounted on the Occasionally, a conventional machine with tracked centreline of a long rectangular pontoon.