1. Rapid Construction and Development of Deck Replacements by Precast Technique for PC Composite Bridge
-Application of “CAP-SLAB” Method to Kamitagawa Bridge of the Chuo-Expressway-

      

• Central Nippon Expressway Co., Ltd.
• Obayashi Corporation

In order to achieve labour-saving and shortening construction period on the deck renewal projects of PC composite bridges, the unique precast PC deck, CAP-SLAB, has been developed and applied to Kamitagawa Bridge, the Chuo Expressway, which is 4 span continuous girders with total length of 125m. In addition, link-slabs instead of expansion bridge joints and full-precast concrete barrier were also adopted. These new technologies have enabled all-precast construction. The construction period was reduced to one-third of the  original based on the cast-in situ method.

2. Construction of the reinforced concrete viaducts with the fully precasted system that improves productivity and reduces construction period (Fukui Kaihotsu Viaduct on the Hokuriku-Shinkansen Line)

      

• Japan Railway Construction, Transport and Technology Agency, Hokuriku Shinkansen Construction Bureau
• Obayashi Corp.

The project, Fukui Kaihotsu Viaduct on the Hokuriku-Shinkansen Line, was faced with challenges, which were advancing the business opening, narrow construction conditions, and the procurement difficulty with labors, materials and equipment due to the demands for the Tokyo Olympic Games.
To overcome the challenges, the fully precasted system was applied to the 11 RC viaducts’ construction as the first case of the railway construction projects in Japan.
The system contributes dramatical reduction on site workloads and construction duration comparing with the traditional in-situ construction method. In fact, labors and construction period in the project were reduced by 45% and up to 65% respectively compared with the traditional method. 

3. ICT construction utilizing remote technology in the first mountain tunnel in Japan
(Tamashima Kasaoka Road Rokujoin Tunnel Construction)

      

• Ministry of Land, Infrastructure, Transport and Tourism Chugoku Regional Development Bureau Okayama National Highway Office
• HAZAMA ANDO Corp.

The Rokujoin Tunnel is a road tunnel with a length of L = 1,088m located in Asakuchi City, Okayama Prefecture. At the Rokujoin tunnel, we applied remote control technology for drill jumbo for the first time in Japan and worked on unmanned construction for drilling work at the face. In addition, at the Rokujoin tunnel, we worked on remote presence technology in inspection work, etc. to improve the efficiency of construction management. These efforts were highly evaluated as contributing significantly to the development of civil engineering technology, and were recognized as worthy of the Technology Award (Group I).

4. Japan national route 106, road construction project in Sokei district,
Tunneling with the use of “NATM management system” and “Concrete lining monitoring system”

　　      

• Sanriku National Highway Office, Tohoku Regional Bureau, Ministry of Land, Infrastructure, Transport and Tourism
• Tohoku branch office, Taisei Corp.

The road construction project in Sokei district including a tunnel applied two ICT technologies named “NATM management system” and “Concrete lining monitoring system” for excavation and lining works, respectively. The former system enabled to monitor and record remotely the operation situation of heavy machines and temporary installed facilities as well as the working environment. It contributed to specifying and solving the emergent problem promptly. The latter system visualized on smart devices filled zone and condition of fresh concrete casted in a moving formwork. Recorded data acquired by several kinds of sensors in those systems can be analyzed for not only tunneling performance enhancement but also maintenance activities.

5. First automated construction of sabo dams at disaster sites in Japan(Akadani No. 3 sabo dam construction)

      

• Kinki Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism
• Kii Mountains Sabo Office / Sediment Disaster Prevention Technology Center
• Kajima Construction Co., Ltd. Kansai Branch

In Japan's largest sabo project for river channel blockage, the introduction of unmanned construction that remotely controls heavy machinery is a condition for the construction of the No. 3 sabo dam located just below the slope where the slope re-collapses repeatedly three times.
In order to ensure safety against slope re-collapse and to construct quickly, the newly developed automated construction technology was added to the unmanned construction in the construction of the sabo dam, and it was applied to the construction work for the first time in Japan.
The automated construction technology for sabo dams established this time has contributed to the development of civil engineering technology by not only prompt disaster response but also improving productivity and promoting construction DX.

 

6. Improve safety at the downtown terminal station by eliminating the steep curved platform
‐Relocation of the JR Iidabashi Station platform using thorough mechanized construction‐

      

• East Japan Railway Company Tokyo Construction Office
• Tekken Corporation Maeda Corporation Joint Venture
• Totetsu Kogyo Corporation Tokyo Branch (Railway Track Maintenance Business)
• JR East Consultants Company

 JR Iidabashi Station's existing platform is located on a steep curve. There is a large distance between the platform and the train, so in this project, the platform was relocated approximately 210m to a section with a gentler curve. Due to the platform relocation destinations were limited ,the vertical gradient of the platform relocation destination will be a steep slope. The track lowering and platform lowering construction was carried out to ease the slope of the track to improve safety and the productivity was improved dramatically. In addition, new technologies such as 3D models and track equipment monitoring were used and as a result, construction was completed in 1 year and 1 month, without any accidents. 

7. Construction of high-quality depth underground structure in metropolitan area

      

• 1st Construction Office Tokyo Metropolitan Government
• Tokyo branch office, Taisei Corp.

This Construction is the road improvement project which is located between Shin-Ohashi-street and Tsukiji-Ohashi (extension 572m) of Ring Road No.2 Main structure is the ventilation station separated by four-story and be located below a deep ground with a maximum depth 34m.
The site is closed to Shin-Ohashi-street, which has a lot of traffic. In addition, there are many obstructions under the ground due to the vacated site used as the Tsukiji Market. Under such circumstances, it is a challenge to construct a deep underground structure without any problem.
This paper shows various construction ideas that have completed high-quality large-scale underground structures.
 

8. Advanced Highway Bridge Slab Replacement Utilizing State-of-the-Art Technologies (Application of Hydro-Jet RD Removal & Flat UHPFRC Renewal Slabs to Moriguchi Route, Hanshin Expressway)

      

• Hanshin Expressway Co., Ltd., Business and Maintenance Management Headquarters
• Tobishima Corp., Osaka Branch
• Kajima Corp., Kansai Branch

Numerous highway bridge slabs are deteriorated and must be renewed in Japan since they have been used under severe conditions for over 40 years. Therefore, advanced technologies are required in order to replace a large number of deck slabs smoothly. Hydro-Jet RD Removal using water jet minimizes social impact, among highly restricted urban environment, because deck slabs can be removed two times faster than conventional method. Flat UHPFRC (Ultra-High Performance Fiber Reinforced Concrete) slabs drastically improve deck slab durability due to their material and structural advantages. These state-of-the-art technologies will be widely used for future deck slab renewal and deserve JSCE technical award.

9. Productivity improvement and Quality control optimization using Construction Information Modeling/Management (CIM) 
(H29-32 Arakawa River Waterway Tunnel Construction Site)

   　

• Arakawa Upstream River Office, Kanto Regional Development Bureau of the Ministry of Land, Infrastructure, Transport and Tourism (MLIT)
• TAISEI Corp.

Construction Information Modeling/Management (CIM) was applied to visualize underground obstacle and construction procedure of waterway tunnel structure. 3-dimensional information using CIM model made it easier to grasp the position of underground obstacles and structures, which provided us prompt decision making. Information during construction such as concrete work, earth work and soil improvement work were tagged to CIM model to utilize for operation and maintenance. Any information such as photos, documents, and drawings can be added to CIM model without restriction. This system enables us to share information at the planning stage, construction stage, and maintenance stage between manufacturer, contractor, and owner on a common platform in a unified manner. 

10. Technological innovation of the PS anchor in the Kawamata Dam rock foundation
-Establishment of rock reinforcement technology with rock anchors-

      

• Ministry of Land, Infrastructure, Transportation and Tourism. Kanto Regional Development Bureau, Kinugawa Integrated Dam Control Office
• Japan Dam Engineering Center
• Nippon Koei Co.,Ltd
• OBAYASHI Corp.

Kawamata Dam is an arch dam with a height of 117m completed in 1966 in Nikko City, Tochigi Prefecture. At the time of construction, the world's largest PS (prestress) anchor class was established to reinforce the foundation rock. However, now after 50 years of construction, the need for foundation rock reinforcement has increased. This project is the first large-scale rock anchor renewal in Japan designed and constructed by innovative technology.
As technological innovations, a tension method called the intermediate unloading method, establishment of double anticorrosion structure with long-term durability, high-precision rock drilling and tension management, a special hanger for transporting tendons, by adopting measuring devices with excellent long-term durability were devised. 
By these technological innovations, we have achieved high durability and high quality of PS anchors in this project. 
 

11. The mountain tunnelling project under strong ground pressure in serpentinite
- Otonaka Tunnel in National road No.40

      

• Hokkaido Regional Development Bureau, Asahikawa Development and Construction　Department, Shibetsu Road Office
• Joint venture of Shimizu Corp., Itogumi Construction Co., Ltd. and Iwakura Construction Co., Ltd.

In the Otonaka Tunnel, large-scale deformation occurred in serpentinite area under the intense ground pressure rarely seen in tunneling history. In the deformed section, a circular triple support structure with an early cross-sectional closure was designed. In the newly excavated section with a fault zone, the advanced central pilot tunneling method was adopted. To design a lining subjected to time-dependent displacement, a reproducing method for time-dependent behavior and a numerical analysis model were developed. In this way, this project overcame the technical challenges through a variety of advanced efforts and made a significant contribution to the development of tunneling engineering.

 

12. The Urban Restoration Project in Satozuka district, Kiyota, Sapporo

      

• Urban Areas Restoration Office City of Sapporo
• Penta-Ocean and Ito joint venture
• Fukken Gijyutsu Consultants Co., Ltd.
• The technical review meetings for urban restoration in Satozuka district, Kiyota, Sapporo
• The technical advisors to restoration in Satozuka district, Kiyota, Sapporo
  SAFER Kitami Institute of Technology
   

As a result of the 2018 Hokkaido Iburi Earthquake, the Satozuka district of Kiyota Ward in Sapporo was suffered tremendous damage. After the earthquake, about half of 140 residents were forced to evacuate, and the existence and sustainability of the local community was threatened. Only two years after the earthquake, restoration work was completed, providing information proactively to support rebuilding homes and personalized follow-up services for disaster victims at a local office in the disaster area. As a result, over 80% of disaster victims wished to rebuild their houses in the area, and most of the reconstruction of their houses was finished after two years and a half from the earthquake, leading to a speedy restoration of urban areas.

13. Improving the efficiency of dam concrete placement by handing down the technology utilizing digital technology
―Kabagawa dam construction work―

      

• Kagawa Pref. River and Sediment Control Division
• Taisei・Tobishima・Murakami Specified Construction Joint Venture

In the dam site, handing down the technology to the young engineers becomes difficult with the decrease of the skilled engineers. In order to solve this problem, at the construction site of Kabakawa dam located in Kagawa Prefecture, masterly skills were made into data using ICT. By educating young engineers using this, productivity improvement and quality assurance were achieved. Fundamental changes in handing down the technology by ICT are the essence of DX, and since it contributes greatly to the sustainable development of the construction industry and the promotion of DX, it recognized worth technology award.

14. Measures Applied for Productivity Improvement of Concrete Bridge Construction
- Adoption of Steel Pipe-Concrete Composite Piers and Rational Construction Method for Pier Segments and the Other-

      

• Central Nippon Expressway Co., Ltd.Tokyo Branch Office
• Obayashi Corporation Tokyo Main Office

Nakajima Viaduct which is seven continuous PC box girders with ca. 500m bridge long is located between Shin-Hatano IC and Shin-Gotemba IC of the New Tomei Expressway. 
In this project, to reduce the number of the labors and shorten the construction period was required because of the recent shortage of construction workers and the busy period due to the 2020 Tokyo Olympics.
Thus three measures have been taken in this project. The 1st is to change the RC hollow structure to the steel pipe-concrete composite for the piers. The second is to apply the rational construction method for the pier segments. The third is to use the new anti-corrosion reinforcing steels for the concrete barriers.
 

 

[Group-2]

5. New Ulaanbaatar International Airport Construction and Operation Project in the Mongolia

      

• Civil Aviation Bureau, Ministry of Land, Infrastructure, Transport and Tourism.
• Japan International Cooperation Agency.
• Oriental Consultants Global Co., Ltd.
• Azusa Sekkei Co., Ltd.
• Mitsubishi Corp.
• Chiyoda Corp.
• Narita International Airport Corp.
• Japan Airport Terminal Co.,Ltd.
• Jalux Inc.
• Nomura Research Institute, Ltd. 
• Japan Radio Air Navigation Systems Association.
• Air Traffic Control Association, Japan.

The New Ulaanbaatar International Airport Construction and Operation Project aimed to construct a new capital airport having a 3,600m runway and new terminal area with 2 million annual passenger capacity. It is a landmark project implemented through all-Japan collaboration by using Japanese loans and participation of Japanese companies.
The technical features of the project include: The ground elevation difference around the passenger terminal building was resolved by adopting the complex floor structure. A large-scale slipform finisher was used to construct a wide area of concrete pavement within a limited construction period. In terms of airport operations, Japanese experts provided technical assistance in airport privatization, airport operations and air traffic control.
 

11. Singapore MRT Thomson-East Coast Line Contract T207

      

• Land Transport Authority, Republic of Singapore
• Shimizu Corporation

Contract T207 of Singapore MRT Thomson-East Coast Line mainly focused on the simultaneous excavation by 4 Tunnel Boring Machines.
Despite the exceptional conditions such as continuous excavation underneath expressway and wide ranged face condition from soft soil to hard rock, the project was completed without accidents using advanced excavation management system and diverse staffing. The project was highly evaluated for its significant contribution to the development of civil engineering technology in Singapore, including improvement of the BIM application and was recognized as a great project with a high degree of contribution to strengthen Singapore's transportation hub function and thus worthy of the Technology Award.
 

JSCE Awards Top