The Metropolitan Expressway is partially closing the No. 1 Haneda Route to traffic due to bridge replacement of the aging Expressway Daishi Bridge. The closure period is from 5:00 a.m. on May 27 to 5:00 a.m. on June 10. Travel Watch has reported on the pre-replacement work and the situation at the site on the first day of construction, but what is the current progress before the work is completed and the road closure is lifted on June 10? The major steps in the construction work are as follows
May 27-28: Cutting and removal of existing bridge
May 29: Slide and erect new bridge
May 30 – June 4: Erection of end bridge girders and fixing of new bridges
June 4-8: Paving and plot line construction
June 8-10: Inspection/Inspection
June 10: Lifting the road closure The sliding erection of the new bridge (May 29) was previously reported and attracted much attention due to its dynamic picture, but the company has also disclosed the progress since then on its special website.
May 30 In fact, the most time-consuming part of the entire construction process is the positioning and fixing (welding of piers) of the new bridge. First, in order to connect the existing bridge girders on the Tokyo and Kawasaki sides with the new bridge, it is necessary to erect girders to fill the gap created by the cutting of the existing bridge.
May 31, Tokyo, Japan: At the end of May, the weather was rainy at times, and rainproof equipment was used at the site to completely cover the work area so that welding work could be carried out under such conditions. The following photos show the start of welding the pillars of the piers and the beams of the new bridge. The amount of welding work is a staggering 8.4 km in terms of distance.
June 1: The beams of the new bridge were tightened with numerous bolts to secure them firmly in place. In the photo below, the part of the column surrounded by soundproofing sheets that protrudes from the left side of the column, which looks vertically darker, is the part that was bolted in place.
June 2: Typhoon No. 2 brought heavy rain to Tokyo on June 2. The welding of the columns, which continued to be carried out in the rainproof facility, was completed. The welding was done around 60 laps around the wedge-shaped dent that can be seen in the photo. The work was suspended in the afternoon due to the typhoon.
June 3: Most of the parapets (wall railings) to prevent vehicles from jumping out of the bridge in case of emergency had been installed before the sliding erection, but work began on the parts that could only be done after the sliding. In addition, devices to cope with the expansion and contraction of the bridge due to temperature changes were installed, as well as devices to prevent the bridge from falling.
June 4 From June 4 to 8, the main work is the construction of pavement and demarcation lines for the new bridge. The pavement is in two layers, upper and lower, and the following photos show the construction of the lower layer (base layer). The following photos show the construction of the lower layer (base layer).
June 5: The upper layer (surface layer) of the two layers (top and bottom) is being constructed. Incidentally, the pavement of this bridge has a larger gap between pavement materials than normal pavement, making it easier for water to permeate the pavement during rainy weather and making it easier to drive on. The air trapped between the tires and the road will escape into this gap, which will also reduce noise.
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