禹长段下穿桥梁处干渠渠道开挖方法简述

摘要

南水北调中线工程河南境内某标段的跨渠大桥已先于渠道施工完毕，桥下渠道开挖施工面临工作面狭窄、净空高度不足且工期紧张等困难。根据现场场地限制情况及水文地质条件，对桥下开挖区进行了分层和分区布置；另根据施工计划和工期要求，配置了相应施工机械并辅以人工开挖。工程实践表明，所选择的开挖方案和设备合理，在保证施工安全的基础上满足了渠道衬砌赶工的需要。%The construction of a bridge over passing the main canal of Middle Route Project of South-to-North Water Diver-sion in Henan Province was completed before the canal excavation and brought difficulties for the channel construction such as narrow construction site and insufficient clearance. According to the constraint site and hydrological-geological condition, lay-ered and partitioned excavations were applied with reasonable arrangement of construction machine and manpower in consideration with project schedule. The engineering practice showed that the adopted excavation solution and the machines were reasonable, which had met requirements of construction acceleration under the premise of ensuring construction safety.