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众所周知，对于钻孔用伸缩钻杆，有很多不同的型号，从3段到6段，桩径有377系列、394系列、419系列……，那么，目前伸缩钻孔方钻杆的最大桩径是多少？

As we all know, for telescopic kelly bar for bore hole drilling, there are many different models, from 3 sections to 6 sections, the piling diameter has 377 series, 394 series, 419 series..., etc. So, what is the biggest piling diameter for telescopic bore hole drilling kelly bar at present?

 

 上图方钻杆尺寸为630-5*26，桩径630mm，共5段，每段26m。直径630mm是迄今为止最大的方钻杆桩径。赛迈斯SMCC方钻杆与徐工旋挖钻机配套使用，赛迈斯SMCC还生产岩弹齿钻斗。施工现场经理说，赛迈斯SMCC方钻杆和凿岩斗大大提高了工作效率，他们非常欣赏赛迈斯SMCC的产品质量。

The size of the following picture of kelly bar is 630-5*26. The pile diameter is 630mm, total 5 sections, each is 26m. The diameter 630mm is the biggest piling diameter kelly bar up to now. This SMCCL kelly bar is worked with XCMG rotary drilling rig, the drilling bucket with rock bullet teeth is also manufactured by SMCC. The construction site manager said that SMCC kelly bar and rock drilling bucket helps them improve the working efficiency a lot, they appreciate SMCC's product quality very much.