研制小型打桩机加固运行变电站基础试验

• 作 者: 杨敏 高公略
• 机 构: 淮海工学院土木工程学院,
• 出 处: 工业建筑
• 发表日期: 2010年07期
• 关键词: 变电站设备 基础试验 钢管桩 基础沉降 加预应力 托换 软弱地基 静载试验 载荷试验 中作业

软弱地基上变电站基础的沉降会影响电力设施的正常运行和安全,现有的加固方法和机械设备往往不能适应高压带电场区作业的技术要求。针对沿海某市海淤地基220kV变电站设备基础沉降问题,在限制安全高度2.2m、不停电的要求下,研制小型打桩机,进行了加固试验研究。研究表明:所研制的小型打桩机能够在运行变电站的限高空间中作业,突破了运行变电站不便进行基础加固打桩的禁区;所打微型钢管桩托换能够有效阻止独立基础沉降;其桩顶施加预应力的“先顶后焊”技术,能够提高加固效果。

The subsidence of substation foundation on soft ground will affect the normal operation and safety of power facilities. Existing reinforcement methods and mechanical equipment often can not meet the technical requirements of high-voltage electric field operation. Aimed at the settlement of equipment foundation of sea-crossing foundation 220kV substation in a coastal city, the small-sized pile driver was developed and the reinforcement test was carried out under the limit of safety height of 2.2m and no power failure. The research shows that the developed small pile driver can work in the limited space where the substation operates, breaking the forbidden area where the substation is not convenient for foundation reinforcement and piling. The application of the miniature steel pipe pile underpinning can effectively prevent the settlement of independent foundation. Applied prestressing “first after the welding” technology, can improve the reinforcement effect.