临近深基坑高压输电杆塔基础加固设计

Reinforcement Design of High Voltage Transmission Tower Foundation Near Deep Foundation Pit

既有高压输电杆塔临近深基坑时,基坑开挖对杆塔安全带来隐患。基于基础托换和深基坑支护技术,提出一种临近深基坑位置既有输电杆塔基础的加固设计方法,该方法首先对输电杆塔浅基础型式进行改造,利用微型桩将荷栽传递到深部土层,然后采用微型桩复合土钉墙支护技术对垂直开挖的深基坑边坡进行加固,该联合加固方法可满足输电杆塔下方土体整体稳定要求。通过某高压输电转角塔基础的加固设计实例,表明该加固设计方法安全可靠,可为临近深基坑位置的高压输电杆塔保护提供技术参考。

The excavation of deep foundation pit lead to security risks when high voltage transmission tower near the pit. Based on the foundation underpinning technology and the deep foundation pit supporting method, a reinforcement design method is proposed for transmission tower foundation near deep excavation. In the method, the shallow foundation of tower is transformed into pile foundation firstly using micro-pile which transfer the loads to the deep soil layer. Then using micro pile composite soil nailing wall supporting technology to support for the vertical excavation of deep foundation pit. The joint reinforcement methods meet the requirements of the overall stability of transmission tower and soil below. By a practical example of the transmission tower foundation reinforcement, the validity of the method is proved, and provide technical reference forprotection of high voltage transmission tower near deep excavation site.