1. When Steel Arch Support changes the top beam:
(1) The original Steel Arch Support shed legs are not moving, undamaged, and the shed legs may not be replaced.
(2) Reinforce the shed leg with a brace and a pole.
(3) Use several rows of string braces to penetrate the two intact top beams to block the upper pumice.
(4) Replace the top beam to ensure that the door is consistent.
(5) After the replacement, the gap between Steel Arch Support and the top gang must be tight and back.
(6) Install a strong struts or tie rods in the Steel Arch Support room.
2. When changing all Steel Arch Support:
(1) Reinforce the nearby Steel Arch Support and leave the road.
(2) If the upper part of the maintenance shed beam is high and the pumice is large, a small raft should be set at the construction site and a gas inspection should be carried out.
(3) Then, according to the method of changing the shed legs and changing the top beam, the items are operated item by item.
