Design and analysis of one-degree statically indeterminate hydraulic support.

To enhance the bearing capacity of traditional two- and four-legged shield hydraulic support, a one-degree statically indeterminate support was designed, and a method to control the linkage of the legs and balance ram was established. Based on the plane frame system, a two-dimensional mechanical model of the statically indeterminate support was established, and the analytical expressions for the transverse distribution interval of the boundary load were derived. The effects of the friction coefficient and balance ram specifications on the boundary load and bearing area were quantitatively analyzed. The results indicated that the bearing area is divided into two regions along the transverse direction. Furthermore, this bearing area can be increased by increasing the friction coefficient, increasing the balance ram specifications, and decreasing the tip-to-face distance under the downward motion of the support. The bearing capacity of the proposed support is considerably higher than that of the traditional support. [ABSTRACT FROM AUTHOR]