2results about How to "Construction method safety" patented technology

The application discloses a method for excavating a connecting channel by using a plasma torch, and the method comprises the following steps: carrying out freezing construction in a stratum until a freezing wall is closed, and the soil in the excavation path of the connecting channel is frozen into a frozen soil body; drawing an excavation contour line of the connecting channel on a working face, the excavation contour line is drawn according to the excavation path of the connecting channel, and the excavation contour line is located in the enclosure of the freezing wall; S2, drawing a cutting line on the working face, the cutting line is located in the enclosure of the excavation contour line of the connecting channel; S3, cutting the frozen soil body along the cutting line by using the plasma torch to obtain a cutting groove; and S4, inserting a nozzle of the plasma torch into the cutting groove. By reasonably designing the cutting line layout and the cutting unit area and combining the high-efficiency melting and crushing of the frozen soil body by the plasma torch, the method overcomes the shortcomings of low efficiency and great difficulty of the traditional construction method, and improves the construction efficiency and safety of the connecting channel.

The utility model discloses a reinforced shield machine cutterhead of tunnelling contour line peripheral stratum, this shield machine cutterhead includes cutterhead, high pressure nozzle, grouting pipe and grouting pump, and the cutterhead includes ring beam, amplitude arm and flange plate, and the amplitude arm is fixed evenly on the flange plate with interval, and the middle part and the end of amplitude arm are connected through ring beam, and the cutter is installed on the cutterhead, and the outer edge surface of the outermost ring beam is provided with mounting hole, and the high pressure nozzle is installed in the mounting hole, and the grouting pump is installed on the shield machine trolley. The utility model improves the structure on the cutterhead, and the mounting hole is arranged on it, and the high pressure nozzle is installed in the mounting hole, and the high pressure cement slurry is injected into the nozzle through the grouting pump through the grouting pipe, and the high pressure cement slurry that sprays cuts and stirs the stratum outside tunnelling contour and mixes with the soil, forms the mixture of cement and soil, and the mixture forms the cement soil with certain intensity after several days, plays the supporting and water -resisting effect when excavating the butt joint section, prevents stratum collapse and muddy water from gushing into the tunnel.