Members of Sasaki's Shanghai office have been on-site at the Xuhui Runway Park in Longhua since earlier this spring as construction workers started demolishing part of the existing runway pavement on the northern edge of the park. Thanks to the quality of the 1948 runway design, the 70 year-old tongue and groove joints on both sides of the remaining panels helped during the concrete removal to keep the edge of the remaining pavement straight.
The contractor also tested the original runway pavement condition under the former Yunjin Road route, which was built to allow traffic through during the subway construction. The park's design intends for a row of these original runway concrete panels to remain, but it was initially unclear whether the old concrete was still there and whether the road surface could be successfully removed without damaging the runway concrete below. It was found that although layers of concrete and asphalt were paved over the runway as temporary road during the subway construction, the construction did not damage the runway, except at the base of light poles and around storm drains. The majority of the runway pavement under the temporary road was intact.
After testing at the edge of the pavement, the contractor was able to peel off the top two layers of asphalt and newest concrete, stripping down to the concrete original to the 1948 runway! This means the project will successfully retain the historic concrete as the "runway" in the park, just as designed.
See below for photos from the site:
Client leadership visited the construction site and discussed construction issues with Sasaki designers.
Contractors break through more recent layers of asphalt and concrete
The original 1948 concrete is discovered to be in great condition
Restoring the strip of runway from Fenggu Road to Longlan Road is expected to be completed by the end of 2016
Broken runway concrete pieces are reused at the resting space along the preserved runway panels
A boardwalk made of carbonized bamboo spans the middle of the roadside rain garden.