Pre-grouting reinforced supporting structure for lower coal seam roadway roof

• Main Authors: KAN JIAGUANG, ZHANG SHENG, REN HONGCHAO, CUI GUANGZHEN, ZHANG HUARONG, LI AORAN, WANG XINJIE, YANG LIN, LIU HONGBO
• Format: Patent
• Language: Chinese; English
• Published: 23.08.2024
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

A lower coal seam roadway roof pre-grouting reinforced supporting structure is characterized in that a plurality of hollow grouting anchor cables vertically and downwards penetrate through an upper coal seam goaf bottom plate rock stratum and enter a middle rock stratum or a roof rock stratum of a lower coal seam roadway, and exposed sections of the hollow grouting anchor cables are reserved above the upper coal seam goaf bottom plate rock stratum; the anchor cable lockset and the anchor cable tray are installed on the exposed section of the hollow grouting anchor cable, and the anchor cable tray is pressed on a roadway bottom plate of an upper coal seam goaf through the lockset. A plurality of roof anchor rods are vertically arranged in a roof of the lower coal seam roadway, anchoring sections of the roof anchor rods upwards penetrate through a roof rock stratum and enter a grouting reinforcement area, exposed sections of the roof anchor rods are reserved outside the roof rock stratum, and anchor rod trays a