Expressway Initiatives for establishing long-term maintenance (Expressway Renewal project)
NEXCO EAST Group Manage Expressway About 1,760 km of about 3,940 km have been in service for about 30 to 50 years, and the number of large vehicles used has been increasing year by year. In addition, about 70% of the total passes through snowy cold areas, and the amount of antifreezing agent spreads to about 160,000 tons per year, and road structures such as bridges and tunnels are in a severe environment. It is a situation that is occurring.
Based on these, Expressway In 2015, we started a large-scale renewal and repair business for road structures in order to continue to play a role as a major artery of Japan that supports social infrastructure such as economy, society, medical care and disaster prevention. In addition, for the purpose of further instilling the need for this large-scale renewal and repair business, Expressway Business name common to companies Expressway Renewal project "and produced a logo.
from now on, Expressway A full-scale renewal project will be undertaken, and constructions involving large-scale traffic regulations such as face-to-face and closed roads will be implemented in each region. Adopting new technology to shorten the construction period and utilizing a mobile protective fence (Road Zipper® System) that allows lane operation according to traffic characteristics to minimize the impact on customers due to business The In addition, in order for customers to fully understand Expressway In cooperation with the company, we will promote publicity of business understanding and construction notices.
" Expressway renewal project" will do this kind of construction.
Replacement of the deck *
Replace it with a durable concrete slab.
※ The deck is a structural member that directly supports a car passing through a bridge and transmits the load to the girder.
Illustration of replacement work on the deck
Construction of floor surface waterproof layer
In order to prevent deterioration of the concrete floor slab, we will construct a high performance floor plate waterproofing on the waterproof layer.
Reinforcement of girder
To increase durability, attach reinforcing members to the girder.
Invert ※ installation
In order to make the tunnel with excessive force applied from around the tunnel to have a stronger structure, install invert and improve stability.
* Invert is to prevent deformation by installing semicircular concrete at the bottom of the road surface and making the tunnel shape circular.
Countermeasure work image
Construction of ground anchors *
In order to ensure the long-term stability of the cut surface, we will construct a ground anchor with high corrosion protection performance.
* Ground anchors stabilize the force that the cut surface of the cut tends to deform by driving a high-strength steel rod or the like.
Countermeasure work image
Increased number of ground anchors
Realization of innovation by introducing SMH (Smart Maintenance Highway)
About SMH Expressway In order to ensure long-term safety and security, the latest technologies such as ICT and robotics are utilized. Expressway Is a project that dramatically improves productivity in asset management.
In the first phase (introduced in 2020), SMH will be developed with the theme of “structure inspection” as the foundation of infrastructure management. Introducing inspection support tools such as high-resolution cameras, inspection robots, and self-propelled measurement vehicles, and recording work using mobile PC terminals, etc., while making the inspection work more efficient, and making decisions using business intelligence tools (BI) Process Standard We will also advance the process. In addition, we will utilize the latest technology such as all-around road images and MR technology.
From 2020, Expressway With the aim of providing sustainable services, business process transformation in infrastructure management will begin.
Introducing SMH development tools using ICT technology.
It is possible to measure the damage of paved road surface and tunnel lining surface with high accuracy while driving at high speed without traffic regulation.
Mobile PC inspection support system
Data can be input based on the history during on-site inspection. In addition, registration work after field inspections is no longer necessary, improving productivity.
Training support tool using MR (mixed reality) technology. Understanding is improved by overlaying internal structures that are not actually visible on the site structure.
All-around road image system
The video with position information allows you to check and measure the video without going to the site. Used as a video information infrastructure, such as registering information tags necessary for road management.
Visualization of inspection data by BI
Visualization of inspection data using Power BI and support for decision making in repair plan study