Download Capital dredging by Institution of Civil Engineers PDF

By Institution of Civil Engineers

The dredging of a totally new web site, calls for cautious research of website stipulations, the power to deal with difficult and unforeseen fabrics, the purchase of costly plant and the disposal of capital dredged fabric. Plus, because the hazards are a lot larger than upkeep dredging, and the dimension and cost tools are varied, contracting additionally wishes very cautious attention. This e-book attracts at the adventure of numerous professional authors to provide an explanation for easy methods to steer clear of operational difficulties, excessive upkeep expenses and the way to minimise the environmental influence.

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Example text

10. The makeup of the drillstring generally consists CLAM' of an open drill bit, subs for seabed reaction handling the downhole equipment and re entry frame. followed by some heavy section drill collars, and finally by the drill pipe itself. For shallow water geotechnical Electro-hydraulic investigations PQ metric size umbilical. flush sided drill pipe is most often used. This is of approximately 100mm internal diameter and therefore allows deployment of 75mm diameter samplers and other insitu testing tools.

What is the material ? Can it be dredged at all ? If it can be dredged what plant is required ? Can it be dredged with the equipment that is available or within economic range of the project? What is the expected rate of excavation - the programme or duration of the works ? Is the material abrasive or cohesive ? What wear and tear will the plant suffer in the process ? Does it require fragmentation? and many more such questions. Fig 1 illustrates a standard vibrocoring unit, being deployed. Standard Vibrocore Unit.

Disturbed samples shall be taken at intervals sufficient to provide a record of the strata encountered. 0m intervals in granular strata and results given as values of penetration resistance on the borehole records at the appropriate depths. Undisturbed samples in silts and clays. 0 Laboratory Testing. Testing shall be in accordance with BS 1377:1975 'Methods of Test for Soils for Civil Engineering Purposes1 where applicable and to meet the requirements of PIANC 'Classification of Soils and Rocks to be Dredged1 Supplement to Bulletin No.

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