公开(公告)号：US4790391A

公开(公告)日：1988-12-13

申请号：US911251

申请日：1986-09-24

申请人： Hiroyuki Hamamura ,  Hiroyuki Kawasaki ,  Taro Watanabe

发明人： Hiroyuki Hamamura ,  Hiroyuki Kawasaki ,  Taro Watanabe

IPC分类号： B25D17/14 ,  E21B1/30 ,  E21B4/14 ,  E21B4/16 ,  E21B10/04 ,  E21B21/12 ,  E21B21/16

CPC分类号： E21B21/12 ,  E21B10/04 ,  E21B21/16 ,  E21B4/14 ,  E21B4/16

摘要： An air-pressure impact type drilling method and an apparatus for the same in which a piston of an air hammer drill is moved up and down by pressure air to produce impact energy and the impact energy of the piston is used to give impact vibrations repetitively to a drill bit. In the air-pressure impact type drilling method and the apparatus for the same, the air hammer drill is operated by the pressure air to be supplied from the ground, the air that has already been used for operation of the air hammer drill is exhausted onto the ground through an air exhaust pipe provided in a drilling pipe and communicating with an air exhaust passage formed in the air hammer drill, and substances cut out by the air hammer drill together with muddy water within the trench are discharged by means of a reverse circulation system while drilling on through the earth. As a result of this, even if the water head pressure acts on the tip end of the drill bit, the pressure of the air for operation of the piston will not be affected by such water head pressure and thus the drilling performance of the air hammer drill will not be ill affected even under the muddy water.

摘要翻译： 一种气压冲击式钻孔方法及其装置，其中气锤钻的活塞通过压力空气上下移动以产生冲击能量，并且使用活塞的冲击能量重复地给冲击振动 一个钻头 在气压冲击式钻孔方法及其装置中，气锤钻机由从地面供给的压力空气进行操作，已经用于气锤钻机操作的空气被排放到 通过设置在钻管中并与形成在气锤钻头中的排气通道连通的排气管的地面，并且通过气锤钻孔与沟槽内的泥水一起切出的物质通过反向循环排出 系统，同时穿过地球。 结果，即使水头压力作用在钻头的尖端上，活塞的运行空气的压力也不会受到这样的水头压力的影响，因此气锤的钻孔性能 即使在泥泞的水下，演习也不会受到影响。