Bridge detailing guide by M. Soubry

By M. Soubry

The united kingdom highways bridge inventory is showing sturdiness difficulties. whereas there are numerous factors of decay, the various difficulties are attributed to terrible detailing and a scarcity of appreciation of buildability via designers. there are lots of resources of recommendation on bridge detailing however the recommendation is never amassed jointly. such a lot to be had expert details comes as recommendation incidental to specific tasks or topics. The "bridge detailing advisor" offers information for engineers and technicians engaged within the guidance and improvement of info for road and lodging bridges, subways, culverts and conserving partitions. The consultant concentrates at the detailing concerns that stick to conceptual and analytical layout. It additionally covers a few layout concerns, resembling entry in the course of and after development and CDM specifications, as a result of their direct relevance to the detailing degree. The advisor explores uncomplicated ideas, that experience proved to be trustworthy in daily use, when it comes to sturdiness and simplicity of development, inspection, upkeep and service. The advisor is meant as a reside record and may be revised and prolonged because of suggestions via the undefined. a proper suggestions strategy is, consequently, incorporated. A CD-ROM can also be supplied with the file. This holds the "details" in CAD structure. This advisor is key studying for specialists, contractors, bridge proprietors and their conserving brokers. it's going to be of direct use to trainee engineers,

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4 Waterproofing A waterproofing layer is a continuous impermeable layer designed to protect the bridge deck against the deleterious effects of surface water, especially waterborne de-icing salts. Asphalt surfacing is not waterproof and rainwater will pass through it. At times and in certain places the rainwater will contain high concentrations of chlorides arising from winter salting operations. Waterproofing of bridge decks in the UK is therefore essential to safeguard their long-term integrity.

7-5. 0-1. A design and detailing difficulty with troughs is the need to ensure that the arrangement is sufficiently strong to transfer forces fiom parapet impact into the main body of the superstructure. 4-2 Service trough at edge of deck AVOID Service troughs to be avoided if at all possible. REMARKS A trough must be waterproofed throughout and provided with a good protective layer, especially to the invert, eg 50 mm-thick fine concrete. Consideration should also be given to protecting the waterproofing on the side walls of the trough, possibly with an additional layer of membrane.

0 The protective layer to the waterproofing system will run under these units. 1 1 Gullies and carrier drain If the amount of water to be collected is such that kerb inlets are not adequate, either gullies or a more positive carrier kom the kerb inlet system will be needed. 13 - 3 Surface water drainage - through-deck connection Void to be formed in fine concrete Heavy dbLy, IIIIIYCU surface entry box IIU, Top of pipe level with' top of waterproofing protection layer Double spigot 150 dia. 12 4 G Outlet through deck ClRlA C543 n n - PREFERRED The drainage system to be above the waterproofing.

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