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Work process
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 Work Process and removal of existing structures |
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| Removal of structures |
| The work for removing the concrete and the elevated highway over the stream started on July 1st, 2003. The total amount of removed structures included 5.86km-long structure of elevated highway, 5.48km of concrete, 5.0km of intercepting sewer, and 0.30km of sewer culverts.
The work process was being divided into Phase-1: Removal of ramps, Phase-2: Removal of the upper plates of the elevated high way, Phase-3: Removal of the piers supporting the elevated highway, and Phase-4: Removal of the concrete covering up the stream. Structures removed included 371 piers supporting the elevated highway, 6,700 piers supporting the concrete, 10 ramps, and 7 land bridges, in addition to the elevated highway and the concrete.
The entire section was divided into three sectors for the removal work, i.e. Sector-1 (Taepyeongno ~ Gwangjang Market) (2km), Sector-2 (Gwangjang Market ~ Nangyero), and Sector-3 (Nangyero ~ Sindapcheolgyo (Railroad Bridge, 1.7km). The removal work was carried out under the three-shift system (i.e. by a total of nine teams) for each sector.
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Removal of ramps |
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- The one-lane, 5m-wide ramps were supported by some piers standing every 24 meters.
They were cut into 24m x 5m-sized pieces and removed with a crane.
- For Sector-1, where there used to be only one lane open between the ramps and the sidewalk, a
crane was made to work on the elevated highway in order to secure a lane for vehicles passing
by on the ground level.
- For Sectors 2 and 3, there were two lanes open between the ramps and the sidewalk.
Thus, a crane was placed beneath the ramps to remove the ramp and piers were cut into
pieces, securing spaces gradually. |
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Removal of the piers supporting the elevated highway |
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- Most of the piers were shaped like a regular hexahedron which sides are one meter or two
meters long.
The piers were being cut to a given size, using a diamond wire saw and then moved with a crane. Efforts were made to reduce noise and dusts by sprinkling sufficient amount of water. |
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Removal of concrete covering up the stream |
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- First, the work was carried out to separate the two-lane section of the street on both sides
of the stream that would remain in place after the removal work from the section to be
removed, using a circular saw. Beneath the concrete, some supporting piles were placed to
prevent from an abrupt collapse of the concrete. The concrete was removed, using some
hydraulic breakers. |
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