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Maintenance, repair, materials, machinery

Energy absorption type Chain-type bridge prevention device

Patent No. 4964205

NEXCO East Japan Engineering Co., Ltd.
Product Summary
Energy absorption function reduces impact force during an earthquake

NETIS Registration Number: KT-120052-VE


共同開発：（株）川金コアテック

Due to the plastic deformation of the slit steel pipe,
Effectively absorbs kinetic energy.

  1. Since it can follow movements in all directions, it does not impair the movement function of the bearing.
  2. It has the same durability as the superstructure.
  3. Visual inspection is possible.
  4. Even after a large-scale earthquake, it can be easily judged whether or not it can be used continuously, and replacement work is easy.
  5. It has a simple structure consisting of only steel parts.
  6. Cost reduction is achieved by using a very common steel pipe (STK M 13A).
Features/Specifications
High energy absorption performance due to plastic deformation
  1. It has high energy absorption performance due to plastic deformation of steel. Since it can follow movements in all directions, it does not impair the movement function of the bearing.
  2. The chain has play (margin) so that the impact force is not directly transmitted to the structure. The load generated in the chain is transmitted to the steel pipe via the bolt, and the steel pipe begins plastic deformation.
Achievements (sales/construction/introduction)

Other road companies:
Public bodies:
Private companies, etc.:

66基
85基
216基

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