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NEXCO EAST Nagano Management Office (Nagano City, Nagano Prefecture) implements face-to-face traffic restrictions accompanying renewal construction of aged bridges between Nagano Chomei Azumino Interchange (IC) and Toba IC (Upper and Lower Line) I will.

The construction to be carried out this time is a construction to replace the reinforced concrete floor slab with a new floor slab at the (Out-bound line) of the Onikumabashi, which is located between Azumino IC of Nagano Expressway IC of Asagi IC. We will regulate the two-way traffic.

During the construction period, it is expected that there will be congestion and congestion on the Expressway, especially on holidays (peak hours 17:00 to 18:00) with a maximum of 3 km on the In-bound line and a maximum of 2 km on the Out-bound line. During construction Homepage for construction, Or the traffic congestion forecast will be posted on websites such as DraPla so please refer to it when using the Expressway.

We ask for your understanding and cooperation as it is necessary to use the Expressway safely and comfortably.

1 construction section

Nagano Expressway Azumino IC-Asagi IC (upper and lower lines)

2 Traffic regulation period and congestion forecast

(1) Regulation Period Tuesday, May 9, 2017 - Friday, July 14 (67 days)

• We will continue to work on weekends and holidays day and night.
• The construction period may change depending on the weather and work progress.

(2) Congestion Forecast

During the construction period, we anticipate the occurrence of traffic jams, mainly on weekends and holidays. Especially on holidays (peak hours from 17:00 to 18:00), In-bound to 3km of traffic can be expected on the up line and up to 2km on the Out-bound line.

3 Traffic restrictions

In the floor slab replacement work, we will reduce the section of each two lanes of up and down lanes to one lane and implement face-to-face traffic regulation to concentrate on Out-bound lanes. For the first few days at the start and end of the construction period, overtaking lane restrictions will be imposed on the upper and lower lanes in preparation for switching to two-way traffic regulation.

4 Construction overview

Located between Nagano Expressway Azumino IC and Asagi IC, Kunikumabashi is a steel 4-span continuous plate girder bridge (197m long) that crosses over the Kunikuma dam. It has been 24 years since it opened in 1993. ..

During this period, the concrete cracks and deterioration of the concrete floor slabs and rust on the reinforcing bars were caused by minute cracks caused by the increase in wheel load due to the increase in size of the vehicle and the salt content contained in the antifreeze agent sprayed during the winter season. It is necessary to carry out plate replacement work.

In order to replace the concrete slab part of the bridge, it is necessary to block the Out-bound line part, so the construction will be done with the two lanes on the In-bound line side as one-way operation with one lane each up and down.

Main work contents

By replacing the existing deteriorated concrete slab with a new concrete slab, it will be transformed into a safe and comfortable Expressway.

*The photo is an example of floor slab replacement work at the Kunikumabashi (In-bound line) that was carried out in the fall of 2016.

5 How to obtain traffic information

(1) Road traffic information available before going out

(2) Road traffic information available during driving

• Twitter's official account "NEXCO EAST(Kanto)" (@e_nexco_kanto ) Also delivers information.