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五灵 2 2 0kV送电线路位于Ⅲ级自重湿陷性黄土地区 ,湿陷土层深厚 ,湿陷量大 ,具有严重湿陷性。在进行杆塔基础设计和地基处理时 ,应抓住自重湿陷性黄土只要不浸水就不会发生湿陷这个特点 ,不拘泥、局限于现行规范 ,施工期间在坑口四周地面以上临时设置堆高 0 .5m防水土台 ,以防雨水或灌溉水流入基坑 ;在地面以上铁塔4个基础外缘 1.5m范围内筑 15 0mm厚土台 ,并向低洼方向作 5 %散水坡度 ,以利于排水 ;在基础底板下填 2∶8灰土并夯实 ,以隔断现浇混凝土时 ,水渗入湿陷性黄土内造成沉陷。以上处理方法比现行规范规定更为合理 ,施工简便 ,安全可靠 ,综合技经指标良好。
Wuling 220kV transmission line is located in grade Ⅲ self-weight collapsible loess area, with deep collapsible soil layers and large amount of collapsibility, with serious collapsibility. During the foundation design of the tower and foundation treatment, collapsible loess with self-weight should not seize as long as it is not submerged. It is not restricted to the current norms. During the construction period, the heap height above the ground around the pithead is temporarily set to 0 .5m waterproof soil Taiwan to prevent rainwater or irrigation water into the pit; in the ground above the tower 4 base outer edge of 1.5m within the scope of building 150mm thick soil platform, and to the low-lying direction of 5% scattered water slope, in order to facilitate drainage; Under the floor fill 2:8 lime and rammed to cut off the cast-in-place concrete, the water infiltration collapsible loess caused by subsidence. The above treatment method is more reasonable than the current norms and regulations, construction is simple, safe and reliable, comprehensive technology index by good.