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西气东输二线东段管道沿线地质复杂,为了解决定向钻穿越施工问题,针对西气东输二线锦江定向钻穿越现状,采用水下光缆与主管道同步回拖技术进行施工。结合工程实例,阐述了水缆的选择、光缆固定方式、定向钻成孔质量控制、应力释放与缠绕、风险预测及防范措施等,对施工中光缆的受力情况进行了分析,其设计回拖力为6.894kN,仅为主管道回拖力的1.19%。水缆同步回拖技术在该工程的成功应用,在国内尚属首次,有效缩短工期约20%,施工成本比传统穿越钢套管降低约80%。该技术可以有效应用于穿越岩石等复杂地质结构,具有较好的经济效益和社会效益以及较高的推广价值。(表1,图2,参4)
In order to solve the problem of directional drilling through construction, the geological conditions along the pipeline along the east section of the second West-East Gas Pipeline are complicated. According to the current situation of the second-direction directional jet drilling of West-East Gas Pipeline, the underwater cable and main pipeline are synchronized back-dragging technology. Combined with the engineering examples, the selection of cable, cable fixing method, hole quality control of directional drilling, stress release and winding, risk prediction and precautionary measures are expounded. The force of cable in construction is analyzed. The force is 6.894kN, which is only 1.19% of the main towed drag. The successful application of the cable retracting technology in this project is the first time in China that the construction period is shortened by about 20% and the construction cost is reduced by 80% compared with that of the traditional steel casing. The technology can be effectively applied to complex geological structures such as rocks and has good economic and social benefits as well as high promotion value. (Table 1, Figure 2, reference 4)