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New Tomei Expressway: Aokigawa Bridge
Pier Construction Project - Okazaki City, Aichi Prefecture, Japan
The Aokigawa Bridge is part of the New Tomei Express Highway, which connects Tokyo and Nagoya with a total length of 328.0 km. The Aokigawa Bridge is located in Okazaki City, Aichi Prefecture. The bridge’s length is 662.0 meter, and the width is 22.0 meter. It is a six-span continuous box girder bridge made out of pre-stressed concrete. The balanced cantilever method with extra-large travelers is adopted to form the superstructure, one box with steel corrugated webs and RC ribs at the cantilever slab. This road bridge consists of five piers in total with varying heights from 30.0 to 79.0 meter, a hollow cross-section and a wall thickness of 0.8 meter. The shape of two piers changes to a solid cross-section and a sloped building frame with around 13.0 degree outwards. The standard casting height is 4.20 meter; the construction cycle is planned with 7 days. The final completion of the bridge is expected in June 2011.
The technical proposal of PERI including the VARIO Wall Formwork, the ACS Automatic Climbing System and the CB Climbing Brackets could meet the requirements of the jobsite best. That is why PERI’s integrated system of formwork and scaffolding platforms was selected. This system allows the climbing of all parts together at the same time. It reduces crane operations and leads to a shortened construction period and increased safety. The VARIO formwork is flexible enough to respond to changing building shapes. Adjusting the VARIO panels is economical and easy because all items for the assembly are standard and rentable parts.
The internal CB platform is lifted by crane. The anchorage is carried out with a foldable pivot plate which operates with its own weight and thus increases the safety significantly: While the climbing and fixing of the brackets including the formwork is managed automatically there is no need of working underneath the lifted materials.
The external platform is climbing crane independently and automatically with the ACS climbing system: the whole platforms including the formwork is lifted hydraulically. The platforms run up to 5.0 meter in advance of the concrete top in order to arrange the 8.0 meter long re-bars.
In addition to the three platforms for the re-bar assembly there are two platforms for the formwork operations (setting and retracting of the VARIO wall formwork panels), one platform for the climbing operation and one platform for the finishing works. This adds up to a total system height of approximately 30.0 meter.
The width of a standard platform is 7.0 meter. It is supported by two brackets. The climbing of the platforms can be operated either individually or simultaneously depending on the situation.
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| PERI Systems In Use |
VARIO GT 24 Girder Wall Formwork
CB Climbing System
ACS R Self Climbing System
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Mr. Makoto Ohta
Jobsite Manager
PERI’s ACS system is successfully applied world-wide and provides both reliability and economic efficiency. I already had a good experience with this system in Taiwan. This time it was very important that the ACS could meet Japanese safety regulations such as for typical Japanese structural design, and that it follows the ‘labor safety and health law’. I will keep on targeting efficiency with this system.
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| Construction Schedule: |
January 2009 – June 2011 |
| Contractor: |
JV of Taisei Corporation and Oriental Shiraishi Corporation |
| Formwork Supplier: |
PERI Japan K. K. |
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Field Service:
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PERI Japan K.K., Japan
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