Gassan
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Gassan completed
Particulars
Owner: unknown
Designer: Ministry of Construction
Contractor: Nishimatsu Construction Co Ltd, Obayashi-Gumi Co Ltd and Tekken Construction Co Ltd J.V.
Statistics
Type: Gravity
Purpose(s): Flood Control / Hydropower / Irrigation / Water Supply
Reservoir capacity: 65 m3x106
Height: 123 metres
Length: 393 metres
Volume of RCC: 731 m3x103
Total volume: 1160 m3x103
Construction Dates
Start of Project: 08/88 (August 1988)
Start of RCC: 06/94 (June 1994)
End of RCC: 10/98 (October 1998)
End of Project: 03/01 (March 2001)
Country: Japan
River: Bonji
DMS Co-ordinates: 38˚34'58.99"N, 139˚53'43.09"E
DD Co-ordinates: 38.583054, 139.895309
Facings
Upstream
| Slope | Type |
|---|---|
| Vertical | Traditional concrete against formwork |
Downstream
| Slope | Type |
|---|---|
| 0.80 | Traditional concrete against formwork |
Spillway
| Slope | Type |
|---|---|
| 0.80 | Traditional concrete against formwork |
Placement
| Layers (mm) | Lifts (mm) |
|---|---|
| 250 | 750 |
| 1000 |
Cementitious material
| Cement (kg/m3) |
|---|
| 91 |
| Pozzolan (kg/m3) | Pozzolan Type |
|---|---|
| 39 | Low-lime flyash (ASTM Class F) |
