Moreover drilling measures in different strata are pointed out,which are firstly drilling without slurry in part of silty clay layer,secondly adopting double-bottom bailing bit and bore directly and abandoning slurry with impact drilling rig in muddy clay layer,thirdly selecting short screw auger at low speed in gravel layer,finally choosing rock-socketed drilling tube in shaly sand layer.

指出旋挖鉆機(jī)在不同地層中的鉆進(jìn)措施：部分粉質(zhì)粘土層中可用清水或干孔鉆進(jìn)，淤泥質(zhì)粘土層中采用雙底撈砂鉆頭、直接用沖擊鉆機(jī)鉆孔棄漿，圓礫層中采用短螺旋鉆頭低速鉆進(jìn)，泥質(zhì)砂巖層中采用嵌巖鉆筒鉆進(jìn)等措施日韩成人观看软件免费，保證施工工期滿足架梁節(jié)點(diǎn)要求。

Moreover drilling measures in different strata are pointed out, which are firstly drilling without slurry in part of silty clay layer, secondly adopting double-bottom bailing bit and bore directly and abandoning slurry with impact drlling rig in muddy clay layer, thirdly selecting short screw auger at low speed in gravel layer, finally choosing rock-socketed drilling tube in shaly sand layer.

指出旋挖鉆機(jī)在不同地層中的鉆進(jìn)措施：部分粉質(zhì)粘土層中可用清水或干孔鉆進(jìn)欧美四A级黄色网站，淤泥質(zhì)粘土層中采用雙底撈砂鉆頭黄片国产视频大全、直接用沖擊鉆機(jī)鉆孔棄漿，圓礫層中采用短螺旋鉆頭低速鉆進(jìn)www刺激高潮com，泥質(zhì)砂巖層中采用嵌巖鉆筒鉆進(jìn)等措施免费观看黄色网站一区二区，保證施工工期滿足架梁節(jié)點(diǎn)要求。

A test for deep planting earth auger reveal out the relationship between auger's rotation speed, feeding speed with its drilling resistant torque in three typical tree planting land of moving dune, sand soil and road side in the area of Keerqing.

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