BRIDGE SITE INVESTIGATION AND PLANNING

Prepared by Nilesh S. Kitey

SELECTION OF BRIDGE SITE:

For best possible location and type of bridge: Detailed ground reconnaissance . Collection of adequate hydraulic/ground

data. Subsoil investigation . Economic consideration. Aesthetic consideration.

IDEAL BRIDGE SITE CHARACTERISTICS: Suitable, unyielding and non-erodable material for

foundation. The stream should be well define and narrow as

possible. Straight reach of stream. Site should be firm, permanent, straight and high

banks. The flow of water should be in steady regime

condition. There should be no confluence of large tributaries in

the vicinity of bridge site. Right angled crossing. There should no need for costly river training works.

CONTI…..

There should be minimum obstruction of natural waterway so as to have minimum afflux.

There should be reasonable proximity to a direct alignment of the road to be served.

Easy availability of labour, construction material and transportation facility.

For minimum foundation cost, the bridge site should such that no excessive work is to be carried out inside the water.

At bridge site it should be possible to provide secure and economical approaches.

Adequate vertical height and waterway is available underneath the bridge for navigational use.

Following factors must be examined before the setting finally the layout of a bridge. Grade of alignment Geographical consideration. Government requirements. Commercial influences. Adjacent property consideration. General features of the bridge structure. Future tends for enlargements. Time consideration. Stream characteristics. Foundation consideration. Navigation consideration.

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