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| CONSTRUCTION PRACTICE OF CIRCULAR SINGLE-WALL STEEL COFFERDAM FOR SPREAD FOUNDATION UNDER DEEP WATER |
| WANGAi-guo |
| Chi na Railw ay Fourteenth Engineering Bureau |
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Abstract The total length of Guixi Xinjiang extra-long railw ay bridge is 798. 34 m. The width of water river is about 400 m， and the depth of water is 7. 0 to 11. 0 m. The bared bed-rock is distributed with gullying s. There are 11 piers in water， which are partly designed for spread foundation (7-piers) at deep position. The foundation bases locate 5 to 6 m beneath the bedrock. After fully compared，we selected the circular single-wall steel cofferdam and the ling tremie concrete seal at the bedrock. This construction practice is very special. The paper describes all the key working procedures， including the choice of construction practice， the design， machining，welding， assembling and sinking of the cofferdam，and also the ring tremie concrete seal at the foot corner of cofferdam and bedrock. Finally， the paper tells several key points that must be noticed in the construction procedure.
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Received: 05 October 2000
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2000, Vol. 17 
