Shield rapid repairing method based on prefabricated UHPC component and magnesium phosphate cement

• Main Authors: CHENG HONGZHAN, ZHOU LINLIN, GUO SHUAICHENG, JUN KYO-JUNG, CHEN RENPENG, ZHANG CHAO, DENG PENG
• Format: Patent
• Language: Chinese; English
• Published: 14.07.2023
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; LIME, MAGNESIA; METALLURGY; MINING; REFRACTORIES; SHAFTS; SLAG; TREATMENT OF NATURAL STONE; TUNNELS

The invention discloses a shield rapid repairing method based on a prefabricated UHPC component and magnesium phosphate cement, and the shield rapid repairing method comprises the following steps: cleaning a to-be-repaired shield segment, and then carrying out polishing treatment; blocking a circular seam, a longitudinal seam and a hand hole of the to-be-repaired shield segment and the adjacent shield segment; the influence of tunnel deformation on the overall shape is considered, and the prefabricated UHPC component is accurately prepared; the prefabricated UHPC components are spliced from the bottom of the tunnel, and the prefabricated UHPC components and the duct piece concrete are connected; the prefabricated UHPC components are connected in a staggered mutual anchoring mode, and overall connection of the prefabricated UHPC components is achieved; and a gap between the edge of the prefabricated UHPC component and the duct piece is blocked, magnesium phosphate cement is injected into the gap between the pr