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Prior to this, the construction method and equipment manufacturing industry of China's underground support engineering was backward, resulting in the collapse of tunnels. In 2006, only a few dozen tunnels collapsed.
Horizontal high-pressure rotary jet drilling machine developed successfully
The SJ180 horizontal high-pressure rotary jet drilling machine developed by Sany Group Beijing Pile Machine Co., Ltd. has successfully completed the offline operation of the SJ180 horizontal high-pressure rotary jet drilling machine, which has filled the blank of domestic all-round high-pressure jet grouting technology and equipment production, and solved the domestic The problem of advanced support for complex strata in tunnel construction.