Shock wave drilling called shock tubes earth drill |
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| 申请号 | US3760888D | 申请日 | 1971-12-27 | 公开(公告)号 | US3760888A | 公开(公告)日 | 1973-09-25 |
| 申请人 | HARE L O; | 发明人 | O HARE L; | ||||
| 摘要 | This earth drill is a parallel array of combustion type shock tubes whose shock waves are directed into a hole for loosening and moving aside earth and rock and in which means are employed for simultaneous ignition of the combustible gases or vapor fuel and oxidizer mixture in each of the tubes, the various positionings of the tubes in the array relative to each other in different embodiments is such that the open end of each tube which directs the shock of that tube down into the hole may have a different elevation from any or all of the other tubes as to produce a desired interaction of the shock waves from the tubes in the array and thereby produce an aggregate shock wave either focused principally downward or one at any of several degrees of downward and outward. The geometry of the shock directing end of each shock tube may vary to enhance the directive effect. | ||||||
| 权利要求 | 1. A drill for producing deep holes in the earth comprising a combustion type shock tube composed of a strong steel tube or cylinder of at least the minimum dimensions required to produce a shock wave from combustible gas or vapor and oxidizer mixture when ignited by an electric spark such minimum dimensions being at least 1 inch in diameter and 3 feet in length said tube being positioned at any angle toward the earth that it is able to discharge from the exit end of the tube a shock wave into the earth to be drilled, the opposite or upward end of said tube being sealed and fitted with fuel and oxidizer ports and a means of ignition and having fuel and oxidizer lines fitted to these ports with electric high voltage and grounding cables having suitable igniter and grounding connections to which they are attached, the exit end of said shock tube being held by its own weight against the moistened earth to be drilled or in water or fluid immediately above the earth to be drilled to provide a stoppage for the pressure build up reaction whereby when electricity from a spark coil ignites the mixture a shock wave is produced ejecting very high speed hot gas imparting energy to break up and move aside earth and rock to produce a hole. 2. An earth drill comprising an array of several or more such shock tube drills as described in claim 1 said array consisting of a placement in an outer enclosing steel cylinder said shock tubes parallel to each other and to the enclosing larger cylinder along their lengths but with the exiting ends having various elevations from the earth against which their blast is directed resulting in that shock tube whose length is along the axis of the enclosing cylinder having its shock wave exit opening considerably higher from the earth and from the open end of the large enclosing cylinder than those shock tubes which are close to the circumference and resulting in those shock tubes whose Position is intermediate between the axis and the circumference of the large cylinder having an elevation between the elevation of the tubes on the axis and those near the circumference thereby producing a steep conical cavity inside the large tube which produces the effect of a shaped charge in that the shock waves from the equilength shock tubes will reach the cavity at the same time producing a strong wave with force concentrated along the axis, with all of the simultaneous ignition required being provided by parallel electric circuitry to the electric igniters and by small ignition ports opening into a sealed steep conical cavity at the upper end of the shock tubes, this cavity resulting from a sealed conical cover on the upper end of the outer cylinder said conical cover having the point of its cone upward and being provided with ignition and fueling ports. 3. An earth drill as claimed in claim 2 in which the individual shock tube exit ports are machined and their geometry changed so that their circumferences are no longer at right angles to the length of the shock tube but are shaped to such angles as to form a cavity more nearly fully conical in shape. 4. An earth drill comprising an array of several or more such shock tube drills as described in claim 1 said array consisting of a placement in an outer enclosing steel cylinder said shock tubes parallel to each other and to the enclosing larger cylinder along their lengths but with the exiting ends having various elevations from the earth against which their blast is directed resulting in that shock tube whose length is along the axis of the enclosing cylinder having its shock wave exit opening considerably higher from the earth and from the open end of the large enclosing cylinder than those shock tubes which are close to the circumference and resulting in those shock tubes whose position is intermediate between the axis and the circumference of the large cylinder having an elevation between the elevation of the tubes on the axis and those near the circumference thereby producing a shallow conical cavity inside the large tube which produces the effect of a shaped charge in that the shock waves from the equilength shock tubes will reach the cavity at the same time producing a strong wave with force concentrated along the axis, as well as with some spherical component to impart energy both downward as well as outward for adequate hole diameter enlargement with all of the simultaneous ignition required being provided by parallel electric circuitry to the electric igniters and by small ignition ports opening into a sealed steep conical cavity at the upper end of the shock tubes, this cavity resulting from a sealed conical cover on the upper end of the outer cylinder said conical cover having the point of its cone upward and being provided with ignition and fueling ports. |
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