杆塔基础重力式挡土墙裂损后框架锚杆修复方案

Study on Rehabilitation Scheme of Cracking Gravity Retaining Wall in Transmission Line Tower Foundation with Anchors

山区输电线路杆塔基础多采用原状土基础或钢筋混凝土板柱基础,基础设计多受上拔受力状态控制。为减少挖方,上拔基础通常采用重力式挡土墙并回填土密实后作为上拔土体的堡坎。受施工质量及其他外在因素的影响,输电线路送电后,挡土墙结构可能会开裂,影响基础的承载状态,成为安全隐患。以福建省中部地区某500kV输电线路角钢塔基础的重力式挡土墙加固修复方案为例,通过计算分析,提出了框架锚杆受力、重力式挡土墙作为护面结构的修复方式,且通过微扰动施工措施的要求,避免基础底板上方覆盖土层的反复挖填,指导工程建设,并为类似工程提供参考。

Usually, the foundation form of the transmission line tower in the mountain area is the foundation in undisturbed soil or the pad and chimney foundation, the key control factor in the foundation structure design is the uplift force.To limit the excavation, the gravity retaining wall and the sand back-filling are always the uplift foundation.Because of the various kinds of external or internal factors, the gravity retaining could be crack and may effect the bearing capacity of the uplift foundation, and then a hidden danger produce.This paper introduced a the rehabilitation scheme case of a cracking gravity retaining wall in a 500kV transmission tower uplift foundation with anchors, the new built concrete retaining wall with anchors bears the earth pressure, and the old gravity retaining wall protect the earth in the middle of the frame.With the weak perturbation construction measure, the anchors and the concrete frame are constructed without repeatedly excavation.The study is indicated the rehabilitation, which provide references for similar construction.