In the complex environment of tunnel construction, the screw jack, with its stable load-bearing performance, becomes a key initial support stage. After the steel arch is installed in place, the construction personnel will use the screw jack to adjust the positioning of the steel arch. Due to the changing geological conditions of the tunnel face, the steel arch frame needs to accurately fit the rock surface in order to play a supporting role. At this time, by rotating the adjustment handle of the screw jack, millimeter level height adjustment can be achieved to ensure that the elevation of each steel arch frame fully matches the design parameters, avoiding the risk of collapse caused by misalignment of the supporting structure.

In the construction of the secondary lining of the tunnel, the screw jack plays an important role in supporting the formwork trolley. As a key equipment for pouring concrete, the overall stability of the formwork trolley directly affects the quality of the lining. During construction, the staff will install spiral jacks at the bottom and on both sides of the trolley. By evenly distributing support points, the weight of the trolley will be smoothly transmitted to the ground. At the same time, the extension length of the jacks will be adjusted according to the lining thickness requirements to ensure the fit between the formwork and the designed lining contour line, effectively preventing problems such as formwork deformation and displacement during concrete pouring.

In addition, screw jacks also play an irreplaceable role in the installation and maintenance of equipment inside tunnels. For example, when installing heavy equipment such as tunnel ventilation fans and transformers, their self-locking function can be used to stably lift the equipment to a designated height, providing safe operating space for subsequent bolt fixing operations; During the track maintenance process, lifting the steel rails with a jack can also facilitate the replacement of sleepers and the calibration of track elevation, greatly improving construction efficiency.