泄洪明渠永临结合迁改施工方案研究与应用

Research and application of construction scheme for permanent and temporary relocation of flood discharge channel

以九江北站鲢鱼洞支渠迁改工程为例,充分考虑河渠迁改工程与主体结构施工的工序衔接及空间位置关系,从经济、安全、可靠性方面分析研究采用临时倒边施工和永临结合一次性迁改施工进行河渠迁改的可行性。结合现场实际情况,通过数值计算分析,优化施工技术方案,在河渠底部设置墩柱、联系梁、柱箍等支撑体系,提高槽墩与上部渡槽受力体系的稳定性,在新老河渠接缝、变形缝处设置止水带,防水卷材、沥青灌缝等防水施工增强措施,降低基坑开挖过程中支渠的结构渗漏风险,有效保证基坑开挖过程中河渠迁改工程的稳定性、完整性。解决了原方案倒边施工后再次施工河渠结构的工期长、成本高、占地大、工序繁琐等问题。为今后类似工程施工提供一定的借鉴与参考。

Takes the relocation and reconstruction project of the silver carp hole branch channel of Jiujiang North Station as an example, and compares and analyzes the two schemes of temporary inverted construction and permanent temporary construction combined with one-time relocation and reconstruction of the open flood discharge channel across the foundation pit. The aqueduct is used to set up trough piers. Provide support, ingeniously and permanently combined with the one-time construction of the silver carp cave branch canal structure, which effectively solves the problems of long construction period, high cost, large land occupation, and cumbersome process of re-construction of the river canal structure after the original plan is inverted. It is for the construction of similar projects in the future. Provide a certain reference.