Conventional rotary drilling rig through the formation of the alluvial gravel strata in the eggs is very difficult, almost impossible to pass through the laminated calcareous conglomerate was cemented. Therefore, the Seven Road to the south of alluvial strata in the pile design is still in extensive

Conventional rotor Rotary rig across the hedge Hongji stratum in the gravel layer of eggs is very difficult, almost impossible to traverse a conglomerate of calcium crystalize laminated. Therefore, the 7 South Road in the brunt of Hongji stratigraphy piling design is still in intensive and large use

The convention turns on lathe digs the drilling machine to pass through above flushes Hong to accumulate the stratum the egg crushed stone stratum to be very difficult, is unable to pass through calcareously nearly cemented assumes the conglomerate the band.Therefore, flushed Hong after seven group

Conventional rotary drilling rig across the above red diluvium of egg formation of gravel stratum is very difficult, almost impossible through the dissection of calcareous cement conglomerate. Therefore, Jingqi road, South of Red diluvium stratum of pile foundation design is still a lot to solve hea

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