Consideration Selection of Bridge Site
Before a bridge is constructed, a suitable site is selected
based on certain factors which have bearing on the economy and stability of the
bridge.
1. At bridge site the reach of the stream should be
straight.
2. The site should be geologically sound i.e. it should be
away from fault zone, and should have unyielding, non erodible foundation for
abutments and piers.
3. At the site, the stream should be narrow with well
defined and firm banks.
4. At site the river flow should be without whirls and cross
currents.
5. At the site there should be suitable high banks above
high flood level on each side.
6. The approaches should be economical. They should not be
very high or long or liable to flank attacks of the river during floods. They
should be free from obstacles such as hills, frequent drainage crossings, built
up areas, sacred areas as grave yards, or trouble some land acquisition etc.
7. The site should be at reasonable proximity to a direct
alignment of the road to be connected.
8. There should be no sharp curves in the approaches.
9. Absence of costly river training works, where they are
unavoidable they should be executed in dry as far as possible.
10. Avoidance of excessive under water construction work.
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