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JapaneseSummary of Award-Winning Technology (JICE National Land Technology Research Center)
Patent No. 4864774 "Reinforcing Method of Water Area Structure"
Patent No. 6360725 "Sealing Material for Double Pipe"
Patent No. 6216340 "Floater and Reinforcing Method of Water Area Structure "
NETIS KTK-160022-A
What is the Re-Pier Method?
This method uses retractable strut members to repair and reinforce piers in service, making them earthquake-resistant, life-prolonging, deepening, etc. and reborn with a new mission.
(Formerly called "Telescopic Strut Method")
Pier
Retractable Repair Reinforcement Reborn
Outline of the Construction Method
The Re-Pier method reinforces existing piles by connecting and fixing them with strut members.In response to external forces acting in the horizontal direction, such as seismic forces, the reinforcement effect reduces the horizontal displacement of the pile head and the cross-sectional force generated in the pile. This method uses this margin to improve earthquake-resistant performance, increase and deepen the front water depth, and extend the life of structures.
The strut member used consists of a sheath pipe part connected to the existing steel pipe pile and a strut part as a reinforcing material connecting the pile. The strut part consists of two steel pipes with different diameters.Because the length of a thin steel pipe can be adjusted by taking it in and out of a thick steel pipe, strut members can be easily attached to the piles of an existing pier.Steel pipes between reinforcing members, existing piles, and struts are rigidly connected and fixed with mortar.
As a result, there is no need to remove or restore the superstructure of the pier in order to attach strut members, making it possible to construct the pier with as little restriction as possible.
Image of Strut Members
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Features of the Method
- The strut members can be easily attached to the pile of the existing pier since the member length can be adjusted by taking in and out the steel pipes.
- This system eliminates the need to remove and restore the superstructure of the pier when installing members, resulting in significant cost reductions and process shortening.
- Construction is possible by minimizing the use restriction of the pier.
- The members are manufactured in the same size, and the variation between piles can be handled by fine adjustment of the member length. A detailed survey between piles is not required in advance.
- The use of a dedicated floater enables divers to manually install heavy objects in the space under the pier.
Won National Land Technology Development "Award for Excellence"
"Method for efficiently seismic reinforcing pier in service" developed by Aomi Construction Co., Ltd. was selected as "award for excellence" and won the Minister of Land, Infrastructure, Transport and Tourism Award at the 19 National Land Technology Development Award.
- JICE National Land Technology Research Center (List of winners of the 19th National Land Technology Development Award)
- Ministry of Land, Infrastructure, Transport and Tourism (the 19th National Land Technology Development Award)
Construction Results
| Construction Name | Orderer | Construction Year | Member Diameter | Quantity | Note |
|---|---|---|---|---|---|
| Disaster Recovery Work of West Wharf Sightseeing Bridge (Part 1) |
Miyagi | 2014 | φ400，500 | 32 Units | -6 m Quay L = 320 m |
| Disaster Recovery Work of West Wharf Sightseeing Bridge (Part 2) |
φ400，500 | 32 Units | |||
| Port Area Improvement Work of Central Bureau No. 2-1, (Ground) Nakajima Port | Aichi | 2014 | φ600，700 | 6 Units | Ferry Pier L = 60 m |
| Port Area Improvement Work of Central Bureau No. 2-2, (Ground) Nakajima Port | φ600，700 | 6 Units | |||
| Port Area Improvement Work of Central Bureau No. 3-3, (Ground) Nakajima Port | 2015 | φ600，700 | 5 Units | ||
| Port Area Improvement Work of Central Bureau No. 5-1, (Ground) Nakajima Port | 2016 | φ600，700 | 7 Units | ||
| Disaster Recovery Work of West Wharf Sightseeing Bridge | Miyagi | 2016 | φ400，500 | 4 Units | -4.5 m Quay |
Disaster Recovery Work of West Wharf Sightseeing Bridge
Shiogama City, Miyagi Pref
Port Area Improvement Work of Nakajima Port
Matsuyama City, Ehime Pref