Abstract:

In this study, a solution is presented to enhance the efficiency of the steel arch support removal process. This is achieved through the utilization of hydraulics and mechanical structures to create a combination propping equipment. The device supporting the dismantling of steel arch support consists of two parts: the front rack and the rear rack, which are linked and controlled to move by cylinders. The rear rack (has a structure similar to the hydraulic support gantry used in the coal mining tunnel, but the top beam is redesigned to be closest to the profile of the tunnel) includes a domed roof connected to the side beams by a hinge. Support equipment is controlled by cylinders, hydraulic cylinder support, and pillar base. The top beam of the rear rack is dome-shaped for the purpose of increasing the contact of the roof beam with the roof of tunnel. This device has a simple structure suitable for tunnel of different sizes, moves easily without the need for additional support devices, and has a support mechanism for removing and with drawing the support pillar. The top of the furnace roof is covered, thus limiting the phenomenon of falling rocks. The top beam has a profile similar to the furnace line profile, helping the roof maintain its previous structure, reducing pressure on the roof beam by minimizing the phenomenon of soil and rock collapse when the support is removed. Besides, it helps increase the contact area and reduce stress concentration on the top beam