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目前国内的220kV及以下等级输电线路铁塔大部分采用阶梯式砼基础。这种基础的挖土量大，砼灌注量大，施工速度慢，同时破坏了周围原状土的强度。经与输电线路设计人员研究、比较后认为，220kV及以下等级输电线路铁塔基础应采用钻孔桩基础（这在超高压输电线路及跨江塔中已应用）。经计算，钻孔桩基础的砼灌注量只有阶梯式基础的1/3。为此我们决定进行实际施工试验。
At present, most of the 220kV and below transmission line iron towers in China use a stepped raft foundation. This type of foundation has a large amount of excavation, a large amount of concrete pouring, a slow construction speed, and destroys the strength of the surrounding undisturbed soil. After researching and comparing with the transmission line designers, it is believed that the foundation of bored piles should be used for the foundations of 220kV and below transmission line iron towers (this has been applied in EHV transmission lines and cross-river towers). After calculation, the perfusion volume of bored pile foundation is only 1/3 of the stepped foundation. For this reason, we decided to conduct actual construction tests.