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2023, Vol. 26(1): 40-46    DOI:
 Tooth arrangement design of retractable DTH hammer bit used for drilling while casing
 ZHANG Boyao, CHEN Baoyi* , YANG Da, BO Kun and CAO Pinlu
 College of Construction Engineering, Jilin University, Changchun 130061, China
Received null  Revised null
Supporting info
 
sponsored by:International Center for Geoscience Research and Education in Northeast Asia, Jilin University
ISSN 1673-9736
CN 22-1371/P
Address:No.938 Ximinzhu Street, Changchun 130026,China
TEL: 0431-88502587
E-mail: sjdz@jlu.edu.cn
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