Medium-thickness coal seam gob-side entry retaining method and support system

The invention relates to a medium-thickness coal seam gob-side entry retaining method and support system. The support system comprises an entry retaining roadway, four channel-steel anchor cable supports, three hydraulic props, a steel wire mesh, a pre-buried sidewall anchor rod, a linear articulated top beam, a crossed articulated top beam, iron shoes and Pi type steel. The hydraulic props and the top beam are connected into a whole and iron shoes are worn at the bottoms of the hydraulic props. The gob-side entry retaining method comprises the following steps:(1), constructing four channel-steel anchor cables for reinforcing supporting along the roadway and arranging the channel-steel anchor cables in a stepping manner; (2), constructing a top anchor rod outside an advance support of a working surface along with working surface mining in advance and mounting the steel wire mesh along the roadway in a hanging manner; pre-burying the sidewall anchor rod along with mining and hanging an anti-tear steel wire mesh along the roadway; (3), at the gob-side entry retaining section inside a working surface mining line, adopting telescopic hydraulic props for supporting. According to the invention, a support body on one side of the roadway is constructed by using rock collapsed from the roof, so that the construction is simple, the cost is low and high safety is realized. The hydraulic props, iron shoes, Pi type steel, cross articulated top beam and the steel wire meshes are combined for supporting, so that the stability of the support system is improved.