Practices on Shield Beam Replacement Technology of Hydraulic Powered Support in Fully Mechanized Coal Mining Face

According to the shield beam failure condition of the hydraulic powered support in No. 10414 coal mining face of Yangliu Coal mine, the paper had analys is on the influence factors of the welded joint breaking, fracturing and other phenomenon occurred in the shield beam of the powered support.With the comparison on th ree replacement plans of the integrated powered support replacement, the powered support withdrawing with a pilot gateway and the powered support withdrawing in d elay, the powered support withdrawing in delay was determined to rapidly replace the shield beam and other large parts of the powered support.The technical plan of th e powered support replacement was clarified.The paper had a detail introduction on the preparation conditions of the coal mining face, the requirements of the roof sup port and steel meshing, the face pushing requirement and the replacement process of the shield beam powered support.the practices showed that the powered support replacement plan of the fully mechanized coal mining face could release a realize, safety and economic replacement of the shield beam in the hydraulic powered suppo t.