What does it mean for the coal mine driving team to press the shed and lift the shed?

Lifting shed refers to vertically rebuilding one or two sheds under the beam heads on both sides of the original I-shaped steel shed (the two are very close, depending on your measures), so as to reinforce the original supporting steel shed at the same time, ranging from four to five, mainly depending on the scrap of your original I-shaped steel shed and the length calculation of the newly erected lifting shed beam.