CIVIL ENGINEERING DRAWINGc - Department of Civil...

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Department of Civil Engineering, The University of the West Indies, St. Augustine, Course CE12B - CIVIL ENGINEERING DRAWING Prepared by Dr. T.M. Lewis PREFACE Civil engineering drawing and structural detailing are concerned with translating the work of a civil engineer into drawings which can be used by a builder to guide the construction of the desired structure. It sounds quite simple. The fact that it is not is shown by the many mess-ups that occur during the construction process - many of which are attributable to poor drawings. The reasons why problems occur are many. For one thing, not all designers have enough technical appreciation of how things are done on site, and for another, contractors often do not understand the logic behind the design. The overriding task of the draftsperson is to anticipate and avoid these shortcomings. Working drawings must be produced that explain the intentions of the designer and are easy for the contractor to follow. The draftsperson should, ideally, have a good understanding of both theory and practice, and, hence be experienced in both the fields of design and construction. However, this is not always the case. Firstly, engineering drawing is a 'game' played according to a set of rules. The materials that are used structurally are as standardised as possible. The quality of the material used is specified in detail according to accepted standards, and also the sizes of the sections that are normally used are standardised. This obviously simplifies the process. Non-standard materials can be used, but they are not readily available, usually cost more, and complicate the design process significantly. Standardised Materials - 1- quality of material 2- size of elements In addition to this, the way in which the drawings themselves are presented follows its own set of rules. There are, for example, standard views and projections, standard scales, and standard symbols and notation. These standards are used and accepted by all parties to the process, because they are understood by all, and this common understanding greatly reduces the risk of error due to break downs in communication. Standardised drawings - 1- views 2- projections 3- scales 4- symbols 5- notation
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The construction industry also has adopted a number of conventions regarding standardisation of specific techniques. There are, for example, standard sizes for spacings, holes, and edge distances as well as for the cover of concrete required over reinforcing steel for specific purposes. These standards have been developed over the years based on vast practical experience, and help to ensure that constructed works provide both safety and good service. Standard techniques -
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This note was uploaded on 11/30/2010 for the course CIIVIL WNG 33155 taught by Professor Y.bahie during the Spring '10 term at The British University in Egypt.

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CIVIL ENGINEERING DRAWINGc - Department of Civil...

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