On 1 July 2021, pavement of light duty decline at Kamoya Project was completed successfully with total length of 1705 meters, consisting of 246 meters of double-layer reinforced concrete and 1459 meters of plain concrete, total grouting volume of 2290m³.
The scope of work undertaken by JCHX at Kamoya Copper & Cobalt Project covers three declines with designed work quantity of 8841.35m/208579.3m³. Since commencement of works on 17 July 2019, we have completed 5988.4m/119277.(YTD 1 July 2021).
After connection of main decline and service decline in mid-March, focus was shifted to LV decline, however the work was severely challenged by sudden massive water ingress. While efforts were made in water control several measures were taken to improve working conditions and extra labor was mobilized to execute floor pavement. Technical communications were organized repeatedly to both Chinese and DRC employees, team on site worked from dawn to dark with emphasis on work quality. Despite of obstacles in cover drilling, grouting and ground support, they successfully completed 826m/1090m³for floor grouting in June, which created solid foundation for underground equipment transportation.
Floor pavement was started since the connection of main decline and service decline and executed from lower to the upper level. The decline (incl. drain) was 4.7m wide, (4.4m net), tilted to the left (drain side) by 1%, the concrete pavement is 0.3m thick. Floor pavement is a complicated task which requires high standard, for which the project personnel implemented multiple effective measures: repeated survey, adjustment, setting out, grouting line arrangement, leveling of floor, stuffing and filling of cavity, compacting with grader, roof dripping and floor water control before grouting, framework supporting, grouting after framework being checked by supervisors, smoothing, roughening & curing.
Several issues which affected work progress and quality, such as undercut and floor levelling, were all effectively addressed by the team on site, drilling jumbo and hand drill were used to rectify undercut; self-developed vibrator was used for ground levelling, LHD and concrete tank were used for concrete pouring, etc.
On 1 July, under the guidance and instructions of supervisor and the Owner, floor pavement of LV decline at Kamoya Project was successfully completed.
