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SRF Earthquake-proof Reinforcement

The SRF method is an earthquake-proof reinforcement method in which a high-ductility fiber belt made of polyester material is reinforced by attaching to pillars or walls, using a tough adhesive.
It is called ‘reinforcement of turret’. The tough adhesive is odorless and does not contain formaldehyde, etc. and uses environmentally friendly materials.
  • Reinforcement
  • adhesive
  • Column reinforcement

SRF construction method

The SRF method is an economical method compared to other conventional earthquake-proof reinforcement methods because it is constructed by attaching a belt made of polyester with a one-part adhesive agent that does not require any special equipment.
There is also a case where reinforcement of the same performance is made at a cost about
10 times lower than the cost of the method designed by earthquake-proof and steel breathing.

Features of SRF method

When subjected to repetitive forces from earthquake, the reinforced concrete members are destroyed, and the steel reinforcement becomes deformed, and carbon fibers and aramid fibers will be broken.
However, the SRF high flexible belt is soft and flexible enough to minimize deformation of existing concrete. The figure on the right shows the deformation of the tensile strength of various stiffeners. SRF reinforcement does not break even after yielding or fracturing of reinforcing steel or carbon fiber.

<Reinforced concrete column>

<Iron concrete columns reinforced with SRF>

Earthquake resistant buildings strengthened by SRF

On the day of the Great East Japan Earthquake, SRF reinforcement work on the 1st floor pilotty part was completed The management members evacuated and after that, the construction company inspected and confirmed that there is no problem in the building.
(40-year apartment building in Sendai city)

In the earthquake disaster area in Japan, there were more than 460 cases of reinforced structures using SRF method, including 143 in office buildings, 77 in mansions, 75 in schools and 34 in government buildings. In addition, more than 1200 bridge piers around Shinkansen area between Tokyo and Shin-Osaka have been reinforced with SRF. However, after the earthquake disaster, when asked to the person concerned of the facility, there was no report that there was a problem as a result of monitoring the condition of the reinforced structure.

SRF earthquake-proof reinforcement(facility maintenance)

On March 11, 2011, at the time of Great East Japan Earthquake, Sakura-no Department Store in front of Sendai station, was the oldest building in Sendai but after reinforcement with the SRF method, it resumed full-scale sales on April 5th, for the first time in Sendai.
(Sendai Sakurano Department Store)

30 pilots were resurrected with SRF, and there were no more pillars or tiles in the area reinforced by SRF on March 11, 2011 in the Great East Japan Earthquake However, the areas that did not have pilots and was not reinforced with SRF was damaged and needed repair for the tiles on the upper floors and damaged walls.
(Apartment in Sendai city)

Resistant to earthquakes exceeding magnitude 7!

<Large shaking table experiment conducted jointly by Japan Disaster Prevention Science Institute and Tokyo University>

<Construction Technology Examination and Certification Technology No. 707 of Japan>

Using the large shaking table of the Japan Disaster Prevention Research Institute, we conducted a vibration experiment with the University of Tokyo with eccentric pilotty (a structure in which one wall is thin and one wall has few walls and a high risk of collapse)
We installed two models(more than 40t) of reinforced concrete 6-story compartments on a large shaking table, and installed earthquake proofing(SRF method) on one first-story pilar.The iron reached the third Kobe maritime wave limit and collapsed in the fourth Chilean earthquake. After the earthquake-proof covering(SRF method), it was proved that the vibration did not collapse after the earthquake of JR Takatori Station,the Chile earthquake and the earthquake of various magnitude 7 were applied seven times.