The installation of the main and service cant frames of the ultra large headgear of main shaft at Musonoi Copper Mine was successfully completed by Kingko Construction SARL (“Kingko”), marking the completion of hoisting system installation, which has represented another milestone of Kingko in installation and demonstrated JCHX’s strength in ultra large headgear installation.
Musonoi Copper Mine is owned by Ruashi Mining, a subsidiary of Metorex of Jinchuan Group. The installation of main shaft hoisting system and construction of service facilities are key works of the project. The main shaft (bank @1465mL, 685m depth), set in the upper part of west limb of orebody, is equipped with two hoisting systems, including a main hoisting system (skip) with a counterweight and a service hoisting system (cage) with a counterweight. The headgear (69m high, 2000t weight) was erected under the support of lifting mast and winch, becoming the first ultra large steel headgear successfully erected by Kingko and the first ultra large headgear in Africa. The main and service cant frames weigh about 1300t.
After the mobilization of over 50 headgear parts, the project started the assembly of mast and main & service cant frames, and the hoisting, welding, cleaning and painting of the main headgear part coordinately and effectively. The management held multiple special meetings to discuss solutions to remove site constraints and erection difficulties, made specific requests on safety matters, job responsibilities and work disciplines, and conducted technical disclosures for erection method, sequence and process. The special erection method requires a number of pulley sets, to which threading holds the key. Then experienced workers were arranged. The threading of 72 main cable braces and 144 main hoisting cables was successfully finished after 15 days of hard work.
The mast erection started on May 28 under the support of main hoisting system and crane and completed successfully five days later. The erection of main and service cant frames was completed respectively on June 5 and 10, which were then connected in the air.
