Design and field trial of self balanced composite steel cofferdam in the condition of deep water
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Abstract:
Large scale water conveyance canal lining is easy to erode and damage under freezethaw cycles and the drainage system at the bottom of the canal may fail during the operation processes.These disadvantages need to be improved.Large scale water diversion projects generally do not have the conditions of waterstopping or water level reduction.Therefore,the repairing techniques of the defects and damages under the condition of non-stop water are one of the key and difficult problems in the operational and maintenance of largescale water diversion projects.Based on the field testing of lining repair of main canal in the middle route of South to North Water Diversion Project,the structure design of an underwater 3.0~3.5 meter steel cofferdam was carried out.A set of self-balanced combined cofferdam techniques,which were easy to install and had effective water stopping,was proposed in this study through further researches of water retaining panel,supporting force transfer system and new water stopping types of structures in different parts..Construction technology of water surface assembly,waterentry and dismantling transfer site of steel cofferdam have also been proposed.The results can provide useful references for underwater repair of dry land with lining of large water conveyance projects.
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