I. High initial bracing force and constant resistance characteristics
High initial bracing force: the initial bracing force of Acrow Prop, especially monolithic Adjustable Props, can reach a high level, such as 70100KN, which is 310 times higher than that of friction pillars. This high initial bracing force makes the Adjustable Props able to contact the roof plate closely, effectively preventing the roof plate from sinking early, thus enhancing the supporting effect.
Constant resistance characteristic: after the pillar is supported, the rated working resistance can be reached in the case of very little top plate sinking (generally less than 50mm), and the constant resistance characteristic is maintained. This means that the Adjustable Props can maintain a stable support force when the roof pressure changes, avoiding the roof damage caused by too much or too little support force.
Second, high supporting strength and good stability
High supporting strength: Acrow Prop has high supporting strength, can withstand large roof pressure, to ensure the stability of the roadway or working as high supporting strength, can withstand large roof pressure, to ensure the stability of the roadway or working face.
Good stability: Because the hydraulic pillar has constant resistance characteristics, all the pillars can withstand the load more evenly, and few individual pillars are overloaded. This helps to maintain the integrity of the roof plate below medium stability and improve the overall stability of the support system.
Third, easy operation and fast lifting speed
Easy to operate: the lifting and lowering of Acrow Prop is realized through the hydraulic system, which is easy and fast to operate. Especially for the external injection type monoblock Acrow Prop, all the valves are installed together, which is convenient for downhole replacement and uphole maintenance.
Fast lifting speed: the lifting speed of hydraulic strut is fast, such as the lifting speed of external injection type monoblock hydraulic strut can reach 70~80mm/s. This helps to shorten the support operation time and improve the construction efficiency.
Fourth, strong adaptability and wide range of application
Strong adaptability: the Acrow Prop can adapt to different geological conditions and support needs. For example, under the complicated conditions such as the working face with excessive water, the working face with wooden roof beam or the working face with serious acidic and alkaline water, the hydraulic pillar can still maintain stable support effect.
Wide scope of application: Acrow Prop can not only be used for mine tunnel support, but also can be used for tunnel, subway and other underground engineering support. In addition, it can also be used as temporary support or end support.
