南宫28能源

At 18:30 on November 10, two 35.8-meter crane girders were steadily placed onto concrete foundation columns. This marked the successful completion of the ultra-high-risk beam-supporting and column-removal work for the 2800mm high-quality medium and heavy plate upgrading project at Liugang No.1 Rolling Mill, an EPC project undertaken by MCC Huatian. The work frees up space for subsequent construction and equipment installation of the No.5 cooling bed. The project provides replicable experience for span expansion renovation of old workshops of the same type and demonstrates MCC Huatian’s strong EPC capacity and reliable delivery performance.

This core technical renovation project supports Liugang’s development in the high-end plate market and the intelligent and green transformation of its production line. Built within the existing plant without additional industrial land, the project carries out systematic upgrades to the heating system, high-pressure water descaling system, key rolling mill equipment and finishing line layout of the 2800mm medium and heavy plate production line. A central control room for the finishing line will also be constructed, and the full-process production control system will be upgraded to realize whole-chain data coordination. After commissioning, the project will improve surface quality control and stable output of high-grade products. It will lay a solid foundation for Liugang to develop high value-added plates and adjust its product structure, help the production line achieve lean management, low energy consumption and high-end output, and strengthen its competitive edge in the regional medium and heavy plate market.

The workshop was built in 1971. Its original 6-meter column grid cannot accommodate the 36.7-meter-wide No.5 cooling bed. Demolishing and rebuilding columns and roof trusses would require heavy investment and a long shutdown period. Therefore, the beam-supporting and column-removal solution was adopted: the main roof truss is retained, and steel brackets bear its load. Four original columns were removed and two load-bearing columns were added to expand the span. The construction was carried out while the workshop remained in operation, bringing multiple difficulties. The working area was narrow with dense pipelines and copper busbars on the roof, limiting assembly and hoisting of large components. The roof truss load had to be transferred from original columns to new columns and brackets, with very little tolerance for graded jacking. The new piles were only 300 mm away from existing piles, and pile construction disturbance might affect the original foundations. As a prerequisite for the No.5 cooling bed, this work directly affected the hot load trial run scheduled for January 30, 2027. The construction faced strict safety and schedule constraints.

The owner, supervision team, EPC project team and construction contractor coordinated closely. Liugang arranged production and construction, and handed over work zones and shutdown windows. The supervisor reviewed technical plans and oversaw key processes. The EPC team formulated daily and shift schedules and assigned personnel to the site, while the contractor worked continuously to assemble trusses. Strict safety control was implemented throughout the work. Before jacking, roof truss members were inspected. Jacks were calibrated and arranged symmetrically for graded, synchronous and micro lifting following the principle of “jack one stage, support one stage” to avoid sustained load. Special staff monitored displacement. Lifting points were verified before crane girder hoisting, and girders were lowered slowly. Damaged hydraulic hoses were replaced, and jacking was performed after trial operation and witness inspection by the project team. The span expansion was completed economically and efficiently to meet the layout requirements of Liugang’s modern rolling mill.

Next, the project team will focus on the construction of the No.5 cooling bed to ensure on-time completion and commissioning, and deliver satisfactory results for the owner, supporting a solid start of the company’s 15th Five-Year Plan.