Sunjiacha Longhua Coal Mine’s first high-height fully mechanized mining face was launched this year6month3on12month11Achieve accurate penetration in days, total duration192Days.
Perimeter of the mining tunnel penetration conductor in Sunjiacha Longhua Coal Mine’s first high mining height fully mechanized mining face8687meter, belonging to the mine nearby10The largest penetration project with the longest length in recent years，And it is an enemy penetration that is difficult to penetrate。The horizontal error of the penetration point is only54mm, elevation error only12mm，This accuracy is much higher than the error range allowed by the "Coal Mine Measurement Regulations"，Being at the leading level in the same industry。
20202The mining tunnel in the working face has the characteristics of long penetration distance and fixed point penetration，Accurate penetration is the key link and difficulty of the entire project。For this，The geological surveying staff of the m88 casino reviewGeological Surveying Section have been prepared in advance20202Working face penetration plan，Optimizing the penetration measurement plan，At the same time, the surveyors design through the drawings、Conductor point layout、Infrared ranging、Laser pointing、Conductor round trip retest、Gyro edge orientation、Internal verification、Computer processing data and other measurement techniques，Finally, the tunnel wires were accurately connected，Achieved20202Working surface belt lane、High-precision and accurate connection between the return air tunnel and the cutting eye。The smooth completion of this project marks the progress of the survey work of Sunjiacha Longhua Coal Mine，Accumulated valuable experience for future integration work。
As far as we know,20202The smooth formation of the working face is the first large mining height working face of Sunjiacha Longhua Coal Mine to achieve the goal of 10 million tons mine，Tight construction schedule、Heavy mission，And this project involves3Interchanges,4Important tunnels such as Gefeng Bridge。During the construction process，The surveyors strictly followed the design plan and repeatedly tested the conductors，Underground conductor measurement strictly follows the first-level conductor measurement，2cValue must not exceed7seconds,and passedJ2Class explosion-proof M88 apptotal station increases the wire side length and reduces the measuring station，Effectively control the accumulated errors of angle measurement and edge measurement，Reliable measurement data is ensured through retesting of the entire conductor，And overcome the influence of nervousness of line release personnel，Go to the tunnel every day to verify measurement data，High-frequency retesting of conductors。
According to statistics, the total number of conductors laid during this penetration63Station, total length of conductor for first test and retest26061meter, gyro orientation4times. before penetration100Within meter range，Checked the middle waist line and head elevation multiple times and actively guided the relevant district teams，Ensure that the tunnel is dug according to the designed direction。And ensure that all preparations for the connection are done in a practical and detailed manner，Make a clear division of labor，Specify the person responsible，Enable the team to obtain sufficient technical support in tunnel penetration。
“This breakthrough is of milestone significance，Not only can ensure the company’s mining continuity，At the same time, it also ensures the smooth completion of production tasks throughout the year，It laid a solid foundation for the subsequent design of large mining height working faces。" said Wang Dong, chief M88 appengineer of the coal mine。(Zhou Hailang Qi Xiaohua)