What is Renewal Project?

Expressway renewal project
(Large-scale renewals / repairs)

This is a large-scale renewal and repair project for expressways, carried out by NEXCO EAST, CENTRAL, and WEST. The project is to sustain the expressway network that is secure, which is going to be achieved by minimizing the lifecycle cost (the total cost for completion) for the whole structure of expressways and taking essential measures for preventive maintenance (maintenance to prevent damage and malfunction) and for quality improvement.

Handling of Structural Deformation up to now

  • Partial Replastering

    Damaged concrete floor slab is partially removed and replaced with new concrete.

  • Thickening of Dock Surface

    現在のコンクリート床版の上面に新たにコンクリートを打ち足して床版を厚くすることにより耐久性能を向上させます。

  • Girder cross-section repairs

    Damaged parts of a concrete girder are chipped, rust on the steal is removed, and then new concrete is placed for the repair.

  • Girder steel repair with steel plate

    Steel plates are attached to the corrupted and reduced areas of steel girders to reinforce them.

  • Steel girder coating (recoating)

    Rust or deteriorated coating is removed and steels are coated again to prevent corruption.

  • Shoe base surface coating

    The surface of the shoe base (a base installed to support shoe bearings that connect a bridge girder and pillar) is coated with surface coating materials such as synthetic resin paints to prevent water penetration and ensure durability.

Large-scale renewal, large-scale repair

What is large-scale renewal?
By working on the old structures of the expressways with the latest technology, we attempt to maintain the functioning and enhance the performance, securing the quality as good as or better than the new structures.
What is large-scale repair?
By repairing and reinforcing the old structures of the expressways with the latest technology, we attempt to restore the functioning and quality that is as good as or better than when they were first constructed, in order to extend their longevity.

Infrastructure longevity plan (action plan)

In November 2015, NEXCO EAST worked out a plan called "NEXCO EAST pan Infrastructure Longevity Plan (Action Plan)". The purpose of the project is to clarify the direction of medium- and long-term efforts to thoroughly promote the maintenance and renewals of the expressways managed by NEXCO East Japan. The plan is based on "Infrastructure Longevity Basic Plan", which was compiled in March 2013 through the meetings among ministries and agencies related to the promotion for measures to be taken for the aging of the infrastructure.

Scope of the Plan

Target facilities
Road facilities [bridges, tunnels, large structures (sheds, large culverts, crosswalks, portal signs, etc.)]
Period
2014 to 2030

Medium- and Long-Term Financial Estimates

NEXCO EAST are working on projects for maintenance and renewal, based on the agreement with Japan Expressway Holding and Debt Repayment Agency. The current agreement includes specific renewals and other construction work specified in "VI. The Orientation of Initiatives Regarding Required Measures", the strengthing of inspection necessary to secure safety through the maintenance cycle, and intensive repairs.

Orientation of Initiatives and the details

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