Optimal construction method for grout filling of PC structure
- repair
- Road companies and local governments
- Conservation and maintenance company
- construction company
- Construction consulting company
- Longer lifespan
overview
Recent surveys and research have shown that, depending on the old materials and construction methods, PC grout may not be completely filled, and there are concerns that existing structures may have poor durability due to insufficient grout filling.
With the PC-Rev® Method, while the PC steel strands are still in a relatively sound state, holes are drilled using an ultra-low vibration drill, the amount of voids in the sheath is measured, and then grout is injected using a snake pump to renew the structure.
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Features
PC-Rev method ® Is composed of the following four element technologies.
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(1) Small diameter drilling of sheath detection type (Patent No. 6170088) |
1) The device is an ultra-low vibration drill (long bit drill), so there is no damage to the area around the drilled hole. 2) In order to prevent damage to the steel material when drilling holes, an ammeter and iron powder sensor monitor the sheath contact and automatically stop the drilling. 3) The small diameter hole of φ15.5 mm can be used both as an investigation hole and an injection port, reducing the burden on structures. |
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②Estimation of the amount of cavity in the sheath (Patent No. 5997864) |
1) The volume of the cavity inside the sheath can be accurately estimated from the pressure change in the reduced pressure vessel connected to the sheath. 2) By approximately correcting the measurement value, errors due to air leakage are reduced. 3) By knowing the amount of voids, precise injection management can be carried out. |
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③ Grout re-injection method (Patent No. 5824588) |
1) The pressure inside the sheath is reduced using a vacuum pump, and the grout is naturally sucked in using the negative pressure.Then, By-pass is closed and pressurized injection is performed using a snake pump. 2) By switching the injection method and appropriately managing the injection speed, air entrapment and blockages can be prevented. |
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錆 Rust prevention grout material (Patent No. 6262979) |
1) By adding calcium aluminate, harmful soluble chloride ions are immobilized. 2) Fixing chloride ions inhibits corrosion of steel. 3) Since a super viscous grout is used, excellent filling properties can be expected. |
Construction procedure
