| 翻訳と辞書 |
| Underground rocket ： ウィキペディア英語版 |
Underground rocket
An underground rocket or rocket drill is a device for rapidly drilling holes through soil and rock of varying composition at rates up to 1 metre per second by utilising supersonic jets of hot gases. It was developed by Russian engineer Mikhail Tsiferov in 1948. According to Soviet geologist, academician Vladimir Smirnov, the device "may well bring about a revolution in the facilities for penetrating the interior of the earth".
Proposed uses for the device included drilling shallow holes for mineral exploration, construction, underground gasification of coal, water and methane drainage.
The initial design called for an autonomous device equipped with a drill head that would be rotated by expanding gases generated by a propellant burning inside a combustion chamber, in a manner similar to a Segner wheel. As the hot gases escaped the slits in the drill head at high speeds, they would break down the ground in front of the device. Experiments have shown the device could achieve drilling speed of 5 metres per minute through solid rock and up to 100 metres per minute in soil.
==Prototype==
Further development led to the first prototype, built in 1968. The device consisted of a cylindrical shell filled with solid propellant, with a number of de Laval nozzles installed in the nose cone. The rocket was positioned nose down and the propellant ignited; hot gases escaped through the nozzles at supersonic speeds. Nozzles aimed downwards were responsible for demolition of the ground underneath the rocket; the next series of nozzles, aimed sideways, expanded the drilled well. Gas escaped between the device's shell and the walls of the well at speeds of up to 100 m/s, carrying along chunks of pulverized rock up to 15 cm across. In the process, the gas significantly cooled down through contact with the shaft's walls. Most of the energy contained in the propellant (5 to 100 thousand hp) was spent on the actual digging, while the device lowered itself deeper into the well under its own weight. Tsiferov's device was capable of drilling the well tens of metres deep and 250-1000 mm in diameter, depending on the type of soil. Experiments have demonstrated that the device is able to drill holes not only in regular soil, but through solid rock, permafrost, ice and aquifers.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Underground rocket」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|