BS 6349-5 PDF

November 29, 2019 posted by

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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The precise tests will be related to the circumstances of the project and the specific requirements. Great care should be taken by the employer in 649-5 reliable information and by the contractor in interpreting this information.

Care under dynamic load should be taken with the execution be intrepretation of test results on soft rocks, especially coarse-grained conglomerates Standard Strength indication Applies to corals and highly S weathered rocks penetration test SPT Point load test BS ?

It is therefore important that these matters receive proper attention from the moment of conception of any work that involves dredging or land reclamation.

When the engineer has decided upon a which work will take place. BS provides recommendations for dredging and land reclamation works. In this way, potentially disposal is on land, attention to the method of harmful effects on the downdrift coastline may bbs connection between floating and sea bed pipelines is avoided or at least alleviated. Variations in current speed and direction occur from sea bed to sea surface at different states of the tide, in fluctuating river discharges and at different seasons of the year.

Where no anomalies are equipment when the sea state exceeds 3 on the visible, it may be necessary to jet away the Beaufort scale. Certain types of dredger may be unable to perform certain dredging tasks, or may only be able to perform that task at much reduced efficiency.

Guidance on selection of dredging plant 5. Due to significant waves Wave height 0. Due to the marine environment, the perform certain dredging tasks, or may only be able percentage of time lost may be significantly greater to perform that task at much reduced efficiency.

The degree of accuracy that can be achieved is restriction to navigation, the measurement of the greater for those dredgers that are positively located available navigable depths has to be made with an by spuds than for those dredgers that are relatively instrument that measures the in situ density of the material comprising the sea bed see 2. In the case of investigation with adequate sampling and dredgers that swing from side to side to operate, laboratory testing of recovered rock cores is such as cutter suction dredgers, the width of cut has essential if the works are to be fully assessed at the to be such that at the extremity of the cut the design stage see 2.


The main advantages of the method are the speed of data recovery and the real-time presentation of data as a section. Rock strength affects the energy required to achieve removal and abrasiveness affects the rate of wear of dredger components. The methods are described in BS In maintenance dredging the strength of the soil to Recent work has indicated that the viscosity of fluid be dredged is inevitably low and it is unnecessary muds is also an important property that may affect for dredging plant employed to have a powerful navigation.

Indirect estimations of the boulder and cobble content can be assisted by considering the mode of formation, composition of laboratory samples and sounding results.

The main advantages of the system are low cost, rapid deployment and, in very soft alluvial silt, the potential to penetrate and perhaps recover up to 6 m of material. Drainage of material consisting of 649-5 particles of silt and clay can be a prolonged process, and it has to be recognized that any areas set aside for the disposal of dredged material are likely to be rendered sterile for a significant ns.

They should be computer processed bed measurably unless it is a soft mud. 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. This is normally given concurrently with the issue of a licence under the Food and Environment Protection Act, subject to consent of those various Departments routinely consulted.

Maritime structures — Part 5: The main disadvantages of the system are that Magnetic anomalies can be caused by iron-rich penetration in anything other than soft materials is dykes and similar geological features, but in UK very small and that the sample may be very waters are mainly caused by pipelines, shipwrecks, disturbed.

BS Maritime works. Code of practice for dredging and land reclamation

When fill is placed hydraulically density of the source material. All these should be included in the log of the Term Description borehole. 63495- it is suggested that mm to mm will give improved results. The signal from echo sounders of this type may 66349-5 from sea bed materials of quite low density.

The depth of channels is may be particularly true upon the completion of dealt with in Normally, it is possible to deploy side-scan sonar at The transducer signals are directed at shallow the same time as echo sounding or sub-bottom angles below the horizontal on either side of the profiling.


BS 6349-5:2016

None of the figures are absolute limits, but operation outside these parameters is unusual and may be difficult. Unlike the range-range systems, the quality of fix is not influenced by the system geometry.

Matters that are fundamental to the operation of dredging plant are discussed in this section. In this clause, only the determination of sea bed levels at specific locations is considered. The disadvantages of the jet pump include a significant reduction in the overall system efficiency when compared with a solids-handling centrifugal pump, and a rather limited residual head available for the gs of the dredged materials through pipelines. Loading takes place with the dredger overburden of silt or cohesive material see 4.

Records that Tide records can be obtained by the installation of a embrace spring and neap tides should be obtained simple paper chart, float or pneumatically operated, over a period of at least 2 weeks in order be gain an tide-recording gauge, which should be levelled to an indication of current velocity and direction.

For this reason, considerable space is devoted to describing the character and mode of 1. The depth of operation of the grab is only can therefore be handled with relative ease, limited by the rope capacity of the hoisting winch although certain types of foreign matter, such hs drum. The teeth may range b a chisel form for spillage and possible reduction in the overdredging stiff clay and very weak rocks to a pick point form necessary to produce a given final depth, equal for the dredging of weak to moderately strong cutting efficiency, regardless of the direction be rocks.

The pretreatment process see 9.

The required horizontal accuracy should be decided at the design stage and taken into account when selecting appropriate plant. The use of range-range equipment also allows the position to be determined with accuracy over greater distances and with closer detail.

This may involve survey lines at centres of between 10 m and 25 m, or perhaps wider line spacing on large-scale works.