Classification of Wing Walls
Wing walls can be classified according to their position in plan with respect to banks and abutments. The classification is as follows:
1.Straight Wing walls: They are used for small bridges, on drains with low banks and for railway bridges in cities (weep holes are provided).
2. Splayed Wing walls: These are used for bridges across rivers. They provide smooth entry and exit to the water. The splay is usually 45°. Their top width is 0.5 m, face batter 1 in 12 and back batter 1 in 6, weep holes are provided.
3. Return Wing walls: They are used where banks are high and hard or firm. Their top width is 1.5 m and face is vertical and back battered 1 in 4. Scour can be a problem for wing walls and abutments both, as the water in the stream erodes the supporting soil.
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—Henry David Thoreau (1817–1862)
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The great Emathian conqueror bid spare
The house of Pindarus, when temple and tower
Went to the ground; and the repeated air
Of sad Electra’s poet had the power
To save the Athenian walls from ruin bare.”
—John Milton (1608–1674)