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2016 Innovative Technique Award

1. Ultra-high-strength Fiber reinforced Concrete (UFC) Cured at Normal Temperature “SLIM-Crete”


  • Takayoshi Hirata (OBAYASHI CORPORATION)
  • Kazunari Sasaki (OBAYASHI CORPORATION)
  • Kouichirou Yoshida (UBE INDUSTRIES, LTD.)
  • Kouji Tamataki (UBE INDUSTRIES, LTD.)

Ultra-high-strength Fiber-reinforced Concrete (UFC) has a compressive strength of more than 150N/mm2 and a splitting tensile strength of more than 5 N/mm2. Its durability is assessed at 100 years. However, conventional UFC requires hot steam curing at 90oC, which limits its applicability to factory production. This paper describes a UFC that hardens at normal temperatures, which has been developed for site construction. This technology can reduce building and maintenance costs. The infrastructure stock can be improved by improving its durability. Future application to bridges and skyscrapers, etc. can be expected because of its light weight.

2. The Development of a Hard Rock Tunnel Excavator, TM-100


  • Fumitoshi Hamada (West Nippon Expressway Company Limited)
  • Yasuki Adachi (Taisei Corporation)
  • Motoki Amano (Taisei Corporation)
  • Masanori Wakayama (Taisei Corporaition)
  • Yosuke Matsuo (MITSUI MIIKE MACHINERY Co., Ltd.)

In a tunnel construction carried out in the vicinity of important structures in residential area, road and/or railway, there are lately many cases where environmental issues such as noise and vibration have to be taken into consideration. Accordingly increasing are cases that the machine excavation with a breaker that produces a crushing noise or the excavation by blasting with explosives cannot be adopted as a tunnel excavation method. If that is the case, tunnels are usually constructed using a conventional tunnel excavator such as a road header. However, as the unconfined compressive strength (UCS) of the rock exceeds 50 MPa, excavation performance extremely decreases and the prolongation of the excavation time cannot be avoided. Therefore, a hard rock excavation machine “TM-100” that can crush hard rocks with their UCS over 100 MPa with disc cutters was developed.

3. Development of Non-destructive test for the fracture of PC wire by Magnetic Flux Leakage


  • Toyoaki MIYAGAWA (Kyoto University)
  • Keiichi AOKI (Central Nippon Expressway Company Limited)
  • Naoki HAGIWARA (Nippon Expressway Research Institute Company Limited)
  • Makoto HIROSE (Shikoku Research Institute Inc.)
  • Miki KIMURA (Shikoku Research Institute Inc.)

Deterioration of the infrastructure becomes the problem. There is the report that broken by deterioration in the PC bridge. Therefore, a technique to inspect the broken of PC wire easily was expected. Therefore Magnetic Flux Leakage was developed.
This method was technique to measure the magnetic flux of magnetized PC wires, but it was a problem that a steel sheath or a re-bar existed. Therefore various studies were carried out.
The Non Destructive Test of the PC wires by the “Magnetic Flux leakage” is essential in the maintenance of the future PC bridge in this way and is revolutionary technique.

4. Development of the supporting robot arm device for arrangement of the heavy rebar (Assist robot for the rebar arrangement)


  • Tomoaki Ogi (Shimizu Corporation)
  • Osamu Urashima (Shimizu Corporation)
  • Shinichirou Ogata (Shimizu Corporation)
  • Makoto Konishi (Activelink Co., Ltd.)
  • Hirofumi Hompo (SC Machinery Corporation)

Improvement of productivity through rebar arrangement becomes important issue, because of high density of the reinforcing bars and the lack skilled workers. Therefore, we have developed the robot that supports to arrange the heavy rebar by robotic arm. This robot can drastically reduce the burden of the workers by using the know-howof skilled workers. The operator can manipulate the rebar by handling the guide grip without any weight load. We achieve the collaboration human and robots, and the workers are released from the laborious works during reinforcement assembly. We have confirmed its effect on the sites and address this is the innovative technology that not only helps to enhance the productivity but also improve the safety, and labor environment.

5. The automated construction system named A4CSEL® (Quad-ACSEL:Automated/ Autonomous/ Advanced/ Accelerated Construction system for Safety, Efficiency, and Liability) focusing on automation of construction machines.


  • Satoru Miura (Kajima Corp.)
  • Kenji Hayashi (Kajima Corp.)
  • Toshiyuku Sugahara (Kajima Corp.)
  • Kenniti Hamamoto (Kajima Corp.)
  • Kenjiro Shimada (Komatsu Corp.)

In view of the aging and shortage of skilled workers, it is essential to improve the productivity; in other words, to execute construction work with fewer workers without loss of quality. Reducing work-related accidents are also highly desired. As a solution, we developed the automated construction system consisting of vibration-rollers, bulldozers and dump-trucks. The features of our proposed system are as follows; development of automatic control systems for general-purpose construction machines and efficiently automatic operation based on accumulation of driving operation data by skilled workers. Moreover we realized the safe and efficient construction where fewer workers operate many machines which perform work automatically, according to construction work planed by humans.


Innovative Technique Award

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