JPCI Award 2022
【JPCI Award for Outstanding Paper】● Research on High Durability of PC Structures Using Heat-Modified Fly AshYuichi KITANO, Kensuke MITO, Yoshitada AKIYOSHI, Hajime ITO
Journal of Prestressed Concrete, Japan, Vol. 64, No. 6● Chemical Analysis of the Concrete Cover of the PCT Girder 19 Years after Desalination
Fumika NAKAMURA, Mamoru MASAKI, Akira NANASAWA, Shinichi MIYAZATO
The 31st Symposium on Developments in PRESTRESSED CONCRETE【JPCI Award for Outstanding Structures】―Civil Engineering Structures Category－● Yoshinogawa Sunrise BridgeLocation: Tokushima City, Tokushima Prefecture
Outline of Structure :YOSHINOGAWA SUNRISE BRIDGE, a continuous prestressed concrete(PC) box girder bridge with a total length of 1696.5m, is one of Japan's longest
road bridges. It was designed and constructed carefully at the estuary of theYoshino River, a home to a wide variety of species, so as not to disturb thenatural balance in the ecosystem. The number of piers in the river wasminimized to reduce environmental impact, and the length of the span in theriver was stretched to 130 m. The cantilever length is one of the longest inthe world for a PC box girder using precast segments.

ClientBasic Design
Detailed DesignConstruction: West Nippon Expressway Co., Ltd: Eight-Japan Engineering Consultants Inc.
: Joint Venture of KAJIMA Co., Ltd., Sumitomo Mitsui Construction Co., Ltd. And TOYO Construction Co., Ltd.
: Joint Venture of KAJIMA Co., Ltd., Sumitomo Mitsui Construction Co., Ltd. And TOYO Construction Co., Ltd.

● Iwagi Bridge(References: Bridge and Foundation Engineering, September 2019, Bridges
and Foundation Engineering, February 2022)
Location: Iwagi Island ~ Ikina Island,
Kamijima Town, Ochi-gun, Ehime Prefecture
Outline of Structure :The Iwagi Bridge connecting Iwagi Island and Ikina Island consists of PC
composite approach bridge on both sides and the main bridge section of a735-m-long, 5-span continuous mixed steel-concrete cable-stayed bridge,
reaching a total length of 916m. The main bridge section is a mixed structurecomposed of concrete structure in the side spans and part of the center span;
and a 315m steel structure in the middle of the 475m center span.
The main tower is a hollow-section RC structure with a height of over 130m
connected by two horizontal members, and diagonal cables are suspended ina 15-level double arrangement mounted between the spans of each side ofeach main tower. It is one of the largest cable-stayed bridges in Japan, withthe longest cable reaching 231 meters.

Client: Ehime Prefecture
Design: Chodai Co., Ltd.
Construction:Kajima Corporation -MM Bridge Co., Ltd. -Fuji P.S Corporation Joint Venture,
Sumitomo Mitsui Construction Co., Ltd.-Sumitomo Mitsui Construction Steel Structures Engineering Co., Ltd.- Showa
Concrete Industry Co., Ltd. Joint Venture,
Sumitomo Mitsui Construction Co., Ltd., Aikyo Co., Ltd.
Shikokutsuken Co.,Ltd., Idumo Corporation, Ogawa Construction Co., Ltd., Daiou Corporation,
Aien Industry Corporation, Oike Corporation

● Nishi Kyushu SHINKANSEN the 2nd Honmyou River Bridge: Japan Railway Construction,
Transport and Technology Agency,
Kyushu Shinkansen Construction Bureau.
Design: Yachiyo Engineering Co., Ltd.
Construction: TEKKEN Corporation, Kyutetsu
Corporation and HORIUCHI Construction Co., Ltd. JV
Client(Journal of the 28th Symposium on Developments in Prestressed Concrete,
Journal of the 18th Railway Engineering Symposium, Bridge and Foundation
Engineering, 2022.11.)
Location: Isahaya City, Nagasaki Prefecture
Outline of Structure :This bridge is located between Shin-Omura Station and Isahaya Station on
the Kyushu Shinkansen (between Takeo Onsen and Nagasaki), which opened
in September 2022, and is a 3-span continuous PC box girder crossing overthe first-class river Honmyou River in Isahaya City. Since this bridge crosses
the river at a shallow angle, the central span is 115m which is the longest
among similar bridges for the Shinkansen. Because the side span intersects
the road with a low clearance due to topographical conditions, the height of
the PC girder is limited, so it was necessary to address the girder deflection
and to maintain riding comfort. Therefore, a verification method thatapproximates the actual live load conditions was developed, and its validity
was verified by actual train running tests.

―Buildings Category－● Kawaguchi City High School(Journal of Prestressed Concrete Japan Vol.65 No.1)
Location: Kawaguchi City, Saitama Prefecture
Outline of Structure :Kawaguchi city high school is a reorganization and integration of three highschools in Kawaguchi city, Saitama prefecture. The campus consists of aschool building and two arena buildings centered on campus road. Based onsite-specific conditions such as building height restrictions and other spatialconfiguration requirements, various prestressed concrete (PC) components
such as precast prestressed concrete (PCaPC) columns, PCaPC slabs, andcast-in-place PC beams are used to achieve the high-quality educational
environment required for each of the regular classrooms, special classrooms,
and the arena. In addition, pretensioned spun high strength concrete (PHC)
piles are used as geothermal piles. Geothermal heat is utilized for HVAC
(heating, ventilation, and air conditioning) system in the teachers' room,
which is also environmentally friendly.

: Kawaguchi City
: Kume Sekkei Co., Ltd.
: Phase 1：Kawaguchi Construction Co., Ltd.
Phase 2：Kawaguchi Construction and Shinmei Construction Joint Venture
Construction (PC) : Phase 1 and 2：P.S. Mitsubishi Construction Co., Ltd.
ClientDesignConstruction● TOYOSU MiCHi NO EKI

ClientDesignConstruction: Shimizu Corporation: Shimizu Corporation: Shimizu Corporation(Journal of Prestressed Concrete Japan Vol.64 No.4, Japan Architect 2022.1,Structure No.163 2022.7)
Location: Koto City, Tokyo Prefecture
Outline of Structure :This structure is a pedestrian deck that is directly connected to the station anda space that aims to create bustle in the city and interaction among people.
The traffic plaza, which is located on ground floor below the deck, requires
visibility and openness as a public space. The structure was realized byadopting 3-ways diagonally crossed prestressed concrete frames.
The post-tensioning cables and reinforcement bars intersecting from 3directions were converted into digital data using a 3D modeling tool. Bar
arrangement studies, which are difficult to develop with 2D drawings, werecarried out by linking any structural elements with BIM from design phase toconstruction phase. As a result, we have realized an attractive new frame
system that takes advantage of the characteristics of the prestressed concrete
structure.

―Renovations Category－● Deck slab renewal work of Tadeno No.2 Bridge (outboundline)
Location: Kanoashi-Gun, Shimane Prefecture
Outline of Structure :In the deck slab renewal work of Tadeno No.2 Bridge, the ultra-high durable
deck slab which completely eliminates the embedded elements in concreteslabs that cause corrosion deterioration, such as reinforcing bars orprestressing steel was used for the first time. The main materials were highstrength fiber reinforced concrete and aramid FRP rods as PC-tendon in twodirections. The ultra-high durable deck slabs were connected by aramid FRP
rods. Eliminating potentially corrosive steel members significantly improves
the durability of concrete structures, reduces life-cycle cost, and prevents third
party injuries due to concrete peeling. In the aspect of sustainability, it is also
possible to reduce life-cycle CO2 emissions from the construction ofstructures to the operation and renewal of roads.
ClientDesignConstruction: West Nippon Expressway Co., Ltd.
: Sumitomo Mitsui Construction Co., Ltd.
: Joint Venture of Sumitomo Mitsui Construction Co., Ltd and Nippon P.S Co., Ltd.

● Widening work of Tsumetadani bridge (outbound line)(Bridge and Foundation Engineering (Vol.56, 2022.6,) The 31st Symposiumon Developments in Prestressed Concrete, (2022.10))
Location: Koka City, Shiga Prefecture
Outline of Structure :In the widening work of this bridge, the first attempt was made to replace theentire amount of natural sand with blast furnace slag fine aggregate (BFS) for
PC girders to be added. By using BFS to reduce the creep and drying
shrinkage of new PC girders, the half-year waiting period required for joining
to the existing bridge was eliminated, and the process was shortened. Inaddition, the productivity of on-site work has been improved by using precast
segment for the new girder. Furthermore, a rational structure was realized byadopting new technology for the PC steel material.
ClientDesignConstruction: West Nippon Expressway Company Limited: P.S. Mitsubishi Construction Co., Ltd.
: P.S. Mitsubishi Construction Co., Ltd.

【JPCI Award for Outstanding Accomplishments of Constructions】● Nation al Route 3 Chitose Bridge Repair Work

: Ministry of Land, Infrastructure,
Transport and Tourism
Kyushu Regional Development Bureau,
Saga National Highway Office
Design: Chuo Consultants Co., Ltd.
Construction : Fuji P.S. Co., Ltd.
ClientLocation: Tosu City, Saga Prefecture
Outline of Structure :The Chitose Bridge across National Route 3 is an RC 7-span Gerber T-girder
bridge. In 1996, it was reinforced by the "continuous cable girder suspension
method" using outer cables, which was the first method in Japan to reinforce
the Gerber hinges.
Damage on the external cable was found in regular inspections, and prompt
repair measures were required due to concerns about insufficient load bearing
capacity.
Since there are no examples of the continuous cable girder suspension
method, repair work was ordered by the ECI method, technicalproposal/negotiation method, replacement of the external cable, system-typesuspended scaffolding, etc. were proposed and adopted.
These proposals minimized the impact on current road traffic andsignificantly shortened the process.

Japan Prestressed Concrete Institute