The mine roof support has retractability and stable and reliable bearing capacity, adapts to the load and deformation of the soft surrounding rock. The stress state of the roof support of the mine is that the back wall is filled and compacted to make it evenly compressed. Mine roof support is used as the upper mine roof support . When the surrounding rock pressure value reaches a certain value, the support will be compressed, so that the pressure of the surrounding rock acting on the mine roof support is reduced, so as to avoid the support damage caused by the surrounding rock pressure being greater than the bearing capacity of the mine roof support .
The mine roof support can be manufactured by centralized prefabrication, or on-site prefabrication for a certain construction site. On-site prefabrication must choose a flat and open site with convenient transportation and access to on-site water and electricity. On-site prefabrication can reduce the transportation links of prefabrication, reduce the loss in the handling process, and reduce the project cost. The prefabrication procedure of the supporting member of the mine roof is as follows: preparing sand and gravel material-mixing fine concrete-pressing the U-shaped groove by the forming machine-demolding and placing and condensing-taking the backing plate to sprinkle water for curing. The mixing ratio of concrete is in accordance with the ratio recommended by the manufacturer. The quantity of materials is controlled by weighing and weighing. Add water with a bucket of specified volume, mix it with a forced mixer to form dry and rigid concrete, and manually pour it into the mold. The machine is forced to vibrate to form. After the saliva is supported by the bead and removed from the machine, it is pushed to the curing site with a special trolley to be set. After the concrete is finally set, turn the mine roof support to take out the pad, regularly sprinkle water, and leave the site after 14 days of curing at room temperature .
