Repairs & Reinforcements
Pier-Rifre Method
Naruse Bridge, Miyagi Prefecture.
Pier-Rifre Method for earthquake-resistant reinforcement was applied to the piers of Naruse Bridge over the Naruse River on the National Route No. 45. The reinforced piers well resisted without damage the Great East Japan Earthquake. The main dimensions of the existing piers of oval shape, 6,500 mm x 2,200 mm, were revamped with reinforcement steel plates of oval shape, 6,724 mm x 2,424 mm, t=12mm and L=8.7m.
Kui Taishin-SSP (Super Strengthening Pile Bents) Method
Tokyo Monorail, Tokyo
The earthquake-resistant reinforcement method was applied to part of the foundation piles of the Tokyo Monorail track linking the Tokyo-Haneda International Airport and the Hamamatsu-cho station, Tokyo. The main dimensions of the existing piles,1,400 mm dia., were revamped with reinforcement steel plates, 1,724 mm dia., t=12mm, L= 15.35 m - 19.95 m, for 100 pieces of piles in total.
STEP Method (Setting Temporary Cofferdams for Existing Structures in Water)
Kamidoi Bridge, Saitama Prefecture.
This patented temporary cofferdam method was applied to the pier reinforcement construction work of Kamidoi Bridge, Saitama city, Saitama Prefecture, over the Ayase River on the National Route No. 122. Main dimensions of the cofferdam of square shape were 10 m x 5.3 m, and H=5.915 m.
NAPP Anchor Method
Nakano River Bridge, Kochi Prefecture.
This patented method was applied to the elongation work of the edges of the abutments and piers to install large-scale earthquake deflection stoppers on Nakano River Bridge. Precast concrete blocks were installed on the bridge in its longitudinal and transversal directions.
SLJ Slab Method
Mukaizano Bridge, Fukuoka Prefecture.
This bridge is located in a certain section of around 100,000-vehicle traffic per day of the Kyushu Expressway. The SLJ Slab Method, using band-end rebars for the precast, prestressed concrete decks in the longitudinal direction of the bridge, was applied to the four-span continuous steel girder bridge to replace all the deteriorated reinforced concrete decks. The method was selected as the most appropriate under the site conditions to minimize the period of the revamp work and the associated traffic control.
