采用手拉葫芦巧转大直径储罐单浮盘
Rotate the single deck of big diameter tank skillfully with hand chain hoist
骆振斌 郭超 张朋飞 王万民 薛馥梅
作者单位：骆振斌 郭超 张朋飞 王万民：中国石油天然气第一建设有限公司；
薛馥梅：中国石油华东设计院。
中文关键字：单盘 手拉葫芦 滚杠 旋转
英文关键字：Single deck, Hand chain hoist, Roller, Rotate
中文摘要：某工程一台2万立方外浮顶储罐因设计变更需对已预制成型的浮盘的单盘进行一定角度的旋转。我们根据施工现场的实际情况，拟定了两种施工方法：一是用多台吊车抬吊旋转；另一种是以罐壁作为持力，用手拉葫芦为工具进行旋转。分别对两种方法从安全、质量、工期、成本四个方面进行比较，综合考虑利弊后，最终选择使用手拉葫芦旋转的方法。该方法是用单盘下方的临时支撑网架作为滚动面，用脚手架杆作为滚杠，在罐壁上焊吊耳作为持力点，用手拉葫芦连接单盘边缘与罐壁吊耳进行旋转。在施工实践时，利用手拉葫芦轻松毫无卡阻地完成了旋转任务，复查旋转角度误差为零。实践证明，用手拉葫芦进行大直径储罐单浮盘的旋转是可行的，而且可以将旋转的角度控制在零误差。
英文摘要：In a project, for one 20000 m3 external floating roof tank, due to design modification, the deck of floating roof which is already prefabricated should be rotated with some degrees angle. According to actual situation of site, we make two construction methods: first one is rotating with some cranes at the same time, second one is rotating with hand chain hoist as tools and with tank shell as a point. Comparing these two methods from HSE, quality, duration and cost, rotating with hand chain hoist is chosen after considering the pros and cons. This method is using temporary frame support under sigle deck as a rolling surface, using lugs welded on tank shell as a point, using hand chain hoist which connects edge of sigle deck and lugs on shell to rotate. In construction practice, rotating task is finished by using hand chain hoist without any blocking. Review the angle of rotating, the error is zero. Practice has proven that it is feasible to rotate the sigle deck of diameter tank using hand chain hoist, and the error of rotating angle can be controlled to zero.