Abstract
National Route 134 of Japan is a scenic coastal highway about 30 miles southwest of downtown Tokyo. Its highly traveled two lane section in the ancient capital city of Kamakura (1.4 km, i.e., 0.85 miles long) is sandwiched by a sandy ocean beach on the south side and a narrow gauge railroad or rock outcrop on the north side. The 50- year old concrete seawall abutting the highway above suffered scour and settlement from a typhoon-caused storm surge in the past with the rest of the seawall also showing heavy deterioration.
Highlights
BACKGROUND National Route134 of Japan is a scenic coastal highway about 30 miles southwest of downtown Tokyo
The pipe piles were pressed into the existing concrete wall to create a new self-standing seawall prior to demolishing and removing the existing wall so it would not require lane closure or major detouring during construction
The roadway was widened towards the ocean to create room for the new turning lane at and near two intersections
Summary
BACKGROUND National Route134 of Japan is a scenic coastal highway about 30 miles southwest of downtown Tokyo. PROJECT The government’s highway agency planned to add a turning lane at a couple of intersections to mitigate chronic traffic jams as well as to reconstruct the functionally obsolete earth retaining concrete seawall.
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