Electric tower pile construction case | State Grid Hunan Provincial Power Transmission and Transformation Project

Project Name:Hunan Hengyang 500 thousand volt substation project

Project Location:Hengyang City, Hunan Province

Project Introduction:The project is located in the mountainous area, which is the project of the State Grid West-to-East Power Transmission from Ningxia to Hunan, where the transportation is inconvenient, the excavator needs to be used to repair the road, the equipment transfer is more frequent, the pile diameter is more varied, and the stratum is changeable.

Client:Zhongnan Survey, Design and Research Institute Co., Ltd

Construction Geology:Clay, weathered sandstone, limestone

Construction Equipment:SR135SCD00318

Bored pile diameter:φ1.4m、φ1.8m、φ2.0m、φ2.2m、φ2.4m、φ2.6m

Bored pile depth:8~18m

Construction drill pipe:Standard φ351×4×10 machine lock drill pipe

Construction Drill Bucket:Pick barrel drill and pick sand bucket with corresponding pile diameter

Construction Difficulties and Solutions:

(1) Equipment transfer, mountainous areas need excavators to repair roads, our 135S equipment can be transported with poles, the transportation height is 3.4 meters, it is not easy to be scratched by wires when transferring to the rural cement road, and rubber tires or wooden planks are laid at the time of rural cement road transportation;

(2) more than 2 meters of large-diameter pile holes, rock formations, construction difficulty, at this time can be similar to the plum blossom arrangement mode, that is, first use a φ1.2m drill bucket around the hole to core to the design depth, and then install a reaming wing above the φ1.2m drill bucket for reaming, to be expanded to the design depth, and then remove the pile bottom sediment.

Construction Efficiency:Depending on the diameter of the pile hole, the efficiency is different

Construction Fuel Consumption:The comprehensive fuel consumption of clay and rock formation is 14~19L/h