US Patent Issued to CHINA RAILWAY 18 BUREAU GROUP on July 15 for "Blast hole arrangement structure used for blasting for rheological soft-weak surrounding rock tunnel and construction method for rheological soft-weak surrounding rock tunnel" (Chinese Inventors)

ALEXANDRIA, Va., July 16 -- United States Patent no. 12,359,567, issued on July 15, was assigned to CHINA RAILWAY 18 BUREAU GROUP Co. LTD. (Tianjian, China).

"Blast hole arrangement structure used for blasting for rheological soft-weak surrounding rock tunnel and construction method for rheological soft-weak surrounding rock tunnel" was invented by Xin Zhang (Tianjin, China), Jinshan Sun (Tianjin, China), Xiangping Zhang (Tianjin, China) and Daqi Hu (Tianjin, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A tunnel section subjected to grouting reinforcement is divided into two parts, that is, an upper half section and a lower half section, cutting vibration reduction holes used in coordination with cut...