Rotary excavating rock-socketed double-barrel type drill bit
GUO LU, ZHOU FUPING, AO XIAOPING, HU PEIQIANG, ZHU WENBANG, YAO ZAIYU
Year of Publication 03.12.2021
Get full text
Year of Publication 03.12.2021
Patent
Concrete surface cylinder type spiral soil digging drill bit for processing long spiral empty hole section
JU WENQI, HU PEIQIANG, AO XIAOPING, HUANG LEI, XU GUXING, LUO PINGNAN, ZHANG XIANLIN
Year of Publication 13.09.2022
Get full text
Year of Publication 13.09.2022
Patent
Graded hole forming construction method for super-large-diameter complex stratum
YIN HONGWEI, ZHOU FUPING, ZHANG ZHIGANG, AO XIAOPING, XU GUXING, HU GUIPING, ZHANG XIANLIN, TAO CHENGCHENG
Year of Publication 29.07.2022
Get full text
Year of Publication 29.07.2022
Patent