紧邻高压输电铁塔路基防护方案比选与应用

Selection and Application of Protection Scheme for Subgrade Close to High-voltage Transmission Tower

云南某道路工程为城市专用快速路,K10+520附近路线紧邻220 k V高压输电铁塔,路基开挖对高压输电铁塔安全构成巨大威胁,施工风险高。以保证路基开挖对高压输电铁塔的安全为出发点,从路基防护角度,通过方案比选,最终确定采用桩板墙支护方案。施工中对铁塔基础的变形进行了跟踪观测,实施效果表明:桩板墙支护方案有效控制了路基施工过程中铁塔基础的累积沉降与不均匀沉降,铁塔变形指标在容许的范围之内,高压输电铁塔安全,同时也验证了方案的合理可行。

A road project in Yunnan is part of urban special expressway, whose route in the vicinity of K10 ＋520 is close to a 220 kV high-voltage transmission tower. The excavation of the subgrade poses a great threat to the safety of high-voltage transmission tower, and the construction risk is high. In order to ensure the safety of highvoltage transmission tower when excavating the subgrade, the scheme of sheetpile wall in the paper was selected as the best from the angle of subgrade protection. The deformation observation of tower foundation was carried out in the construction. It is shown that sheetpile wall can effectively control the accumulation settle-ment and uneven settlement of the tower foundation in subgrade excavation, and the tower deformation is in the allowable ranges. The use of sheet-pile wall has ensured the safety of high-voltage transmission tower, meanwhile, it verifies the rationality and feasibility of the scheme.