    1. The essence of the joint tunneling method
    The essence of the combined roadheader tunneling method is to continuously carry out various processes such as mechanically breaking rock and exiting the boring machine to realize continuous tunneling. The continuity of the process is the biggest process feature of this method.
    2. Evaluation of joint tunneling machine
    a pros and cons
    (1) Advantages: Simplified excavation process, continuous operation, fast excavation speed; high degree of mechanization, labor saving, low labor intensity, no blasting, less damage to surrounding rock, high safety; smooth wall, no over-excavation, roadway The quality is good, the support is simple, the cut pieces are small and uniform, and the drainage is easy.
    (2) Disadvantages: Large and bulky body, high weight and high cost, complicated structure, long manufacturing period and auxiliary time; large power capacity, high power cost, long tool life, poor adaptability, and required radius of curvature of roadway Not suitable for variable rock formations.
    b Applicable conditions
    (1) The basic investment is large, and the required winding path is long, generally not less than 400m;
    (2) The geological conditions should be clear, mainly because it is suitable for the construction of roadways where the rock formation is relatively stable and not easy to fall;
    (3) Applicable to medium-hard rock formations. Hard rock formations are difficult to apply due to excessive tool costs;
    (4) Mainly used for straight roadway excavation with large radius of curvature;
    (5) The diameter of the excavation should not be too large. Although there are more than 10m models in foreign countries, the reasonable diameter in China is 3~5m.
    The essence of the combined roadheader tunneling method is to continuously carry out various processes such as mechanically breaking rock and exiting the boring machine to realize continuous tunneling. The continuity of the process is the biggest process feature of this method.
    2. Evaluation of joint tunneling machine
    a pros and cons
    (1) Advantages: Simplified excavation process, continuous operation, fast excavation speed; high degree of mechanization, labor saving, low labor intensity, no blasting, less damage to surrounding rock, high safety; smooth wall, no over-excavation, roadway The quality is good, the support is simple, the cut pieces are small and uniform, and the drainage is easy.
    (2) Disadvantages: Large and bulky body, high weight and high cost, complicated structure, long manufacturing period and auxiliary time; large power capacity, high power cost, long tool life, poor adaptability, and required radius of curvature of roadway Not suitable for variable rock formations.
    b Applicable conditions
    (1) The basic investment is large, and the required winding path is long, generally not less than 400m;
    (2) The geological conditions should be clear, mainly because it is suitable for the construction of roadways where the rock formation is relatively stable and not easy to fall;
    (3) Applicable to medium-hard rock formations. Hard rock formations are difficult to apply due to excessive tool costs;
    (4) Mainly used for straight roadway excavation with large radius of curvature;
    (5) The diameter of the excavation should not be too large. Although there are more than 10m models in foreign countries, the reasonable diameter in China is 3~5m.
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