As the national environmental protection and national policies become more and more popular, mining pits can no longer be purchased from natural pine forests but only artificial pine forests. Due to t

The retractable steel support of the roadway has the advantages of high initial supporting force, large support strength, easy installation, and difficult to deform. Therefore, it is often used to man

U-shaped steel ring retractable steel arch support The ring-shaped collapsible stent is also known as a closed collapsible stent. The sections of the stent are connected to form a closed ring, so they

Support arch is widely used in China, especially when the deformation and pressure of the surrounding rock of the roadway is large, using the support arch has its advantages.

The underground roof support is a passive support for underground coal mine support. It has high tensile strength and compressive strength. At the same time, it has good toughness performance, high su

The tunnel roof support is a passive support for coal mine support. It has high tensile strength and compressive strength. At the same time, it has good toughness properties, high support force, and s