Pipe jacking project is regarded as a technology of nonexcavation pipe jacking construction project, which has the most prominent feature of adaptability. The cutter head is one of the key components of the jacking machine crossing oilgas pipelines, which major function is to accomplish crushing and peeling of rock soil of tunnel face, and takes a key role in digging function. Because of the difficulty of changing cutters and the complexity of the work environment, there is a high demand for the intensity of the cutter head. A corresponding cutter design program is established based on the special geology of the construction domain, and the torque and thrust calculation methods are given. Besides, the finite element model is established under the help of the ANSYS(finite element analysis software), so that the stress, strain, and strength reserve distribution are obtained. The analysis results show that the greatest equivalent stress appears at the interface between corbel and transmission shaft. The greatest stress is 37.6 MPa and the largest distortion is 0.06 mm.The result of this research provides effective theory evidence for optimal structural design of the cutter head.

By using SnCl2·2H2O as raw material ,the pure SnO2 thin films were prepared on the glass and quartz flat substrates by spray pyrolysis process. The crystal structure and surface morphology of the thin films were characterized by using XRD and SEM. The films which were prepared at 500 ℃ are smooth and fine. At 320 ℃, the films which were prepared for 50 min show relatively strong diffraction peak. At the same spray time, the strength of diffraction peak is enhanced when the temperature is 380 ℃.