The man’s identity card was lost, but he accidentally found an identity card. The man on the ID card was not only similar in age but also similar in appearance. Fortunately, he did not need to renew his ID card. On May 25, he wanted to take a train to Jingzhou. At the time of security check at the train station, he became a “rapistâ€. At the beginning of May, Yu Mou accidentally lost his identity card. When he was worried, he unexpectedly ushered in “good luck†and found a second-generation resident identity card with the name of Chen Moumou. Even more gratifying was the age of Chen Moumou. Looks very similar to him. He also showed his credentials to his friends. Many of his friends thought that he was using fake photos of his own photos. In order to avoid the trouble of re-issuing ID cards, Yu Mou took the chance to use Chen’s identity card. On May 25th, Yu Mou went to Enshi Railway Station to purchase a train ticket to go to Jingzhou. When entering the security check , the police required an ID card. After the police saw the name displayed on the ID card of Yu Mou as Chen Moumou, he repeatedly asked, “Is this your ID card? You are Chen Moumou?†Yu Mou insisted that he was Chen Moumou. You have a problem with your eyes. Is it not I that you cannot see it? This is me! It's also a policeman." The voice just fell, Yu Mou was arrested by the police. For a moment, Yu Mou in the unknown, scared out a cold sweat. In the ensuing interrogation, Yu Mou was informed that Chen Moumou, who was pretending to be guilty of being raped, was immediately wanted on the Internet. He immediately confessed his true identity and his illegal behavior of fraudulently using ID cards from other residents. He also kept pleading: Police officer, I am Yu Mou, really not Chen Moumou, not a rapist.†After the civilian police inspected and confirmed the true identity of Yu Mou and ruled out his suspicion of committing the crime, Yu Mou was also sentenced to 7 days of administrative detention for fraudulent use of his ID card.
Percussion drilling is employed when auger or wash boring is not possible in very stiff soil or rock. It also can be used in most soil types.
Here the advancement of a hole is achieved by alternatively lifting and dropping a heavy cutting or hammering bit that is attached to a rope or cable that is lowered into an open hole or inside a temporary casing (casings are hollow cylindrical pipes used for borehole stability and to prevent the loss of drilling fluid through the boreholes).
Usually a tripod is used to support the cable. The stroke of bit varies according to the ground condition. The major disadvantage of this method is that it is not possible to get good-quality undisturbed samples. In very hard rock (and especially fractured hard rock), down-the-hole (DTH) drilling can be employed. In this case the hammer, applying repeated percussive pressure, is located just behind the drill bit inside the hole, unlike the open percussion drilling, where the hammer is on top of the drilling string.
The drilling string provides the necessary force and rotation to the hammer and bit, as well as compressed air or fluids to the hammer and for the flushing of cuttings.
This arrangement also allows for much deeper percussion drilling. However, the DTH drills are typically more expensive.
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