1. Check one by one whether the connecting parts and pins of the U-shaped tunnel roof support are complete and fastened, whether the movable cylinder body is damaged or deformed, check whether the sealing of each valve pipe joint and oil cylinder is good, and whether there is any leakage or fluid flow in the hydraulic system phenomenon.
2. Check whether the connection between the push jack and the front and rear scraper conveyors is reliable, and the U-shaped steel arch support can be moved after confirming that there is no problem.
3. Before moving the U-shaped underground roof support, clean up the floating coal and obstacles on the top, bottom plate, front of the frame and base, and on the base.
4. Before moving the U-shaped underground roof support, hang the positioning line, and insist on moving the frame according to the line.
5. Before moving the U-shaped tunnel roof support, promptly remind the surrounding workers to pay attention or allow them to avoid accidents.
6. Check the coal wall, roof, bottom plate and the components of the steel arch support, the cables in the rack, and the high-pressure hose, etc., and deal with the problems in time.
7. Before moving the U-shaped steel arch support of the end, clean the floating coal in the front and between the racks, expose the single pillars of the jacks and the upper and lower sides of the roadway, and organize the front moving space of the rack, and the pipelines should be hung neatly.
