Irahara
Download PDF data sheet
Irahara under construction
Particulars
Owner: unknown
Designer: Fukuoka Prefecture
Contractor: Taisei Corp., Fujita Corp. and Okamoto Doboku Corp. JV
Statistics
Type: Gravity
Purpose(s): Flood Control / Water Supply
Reservoir capacity: 29 m3x106
Height: 81 metres
Length: 295 metres
Volume of RCC: 372 m3x103
Total volume: 419 m3x103
Construction Dates
Start of Project: 07/14 (July 2014)
Start of RCC: 07/15 (July 2015)
End of RCC: 03/18 (March 2018)
End of Project: 03/19 (March 2019)
Country: Japan
River: Harai
DMS Co-ordinates: 33˚34'59.92"N, 130˚56'53.55"E
DD Co-ordinates: 33.583309, 130.948212
Facings
Upstream
| Slope | Type |
|---|---|
| Vertical | Traditional concrete against formwork |
| 0.60 | Traditional concrete against formwork |
Downstream
| Slope | Type |
|---|---|
| 0.77 | Traditional concrete against formwork |
Spillway
| Slope | Type |
|---|---|
| 0.77 | Traditional concrete against formwork |
Placement
| Layers (mm) | Lifts (mm) |
|---|---|
| 250 | 1000 |
Cementitious material
| Cement (kg/m3) |
|---|
| 84 |
| Pozzolan (kg/m3) | Pozzolan Type |
|---|---|
| 36 | Low-lime flyash (ASTM Class F) |
