Unbound and hydraulically bound mixtures - Part 4: test methods for laboratory reference density and water content - Vibrating hammer.

松散的和液力粘合的混合料。第4部分：实验室参考密度和水含量的测试方法。振动锤。

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YZX127 hydro hammer used for full face drilling is described with its structural characteristics, performance parameters and laboratory test results as well as the application prospects introduced.

介绍了用于全面钻进的YZX127型液动潜孔锤的结构特点、性能参数、室内岩样实钻试验效果，展望了其广阔的应用前景。

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