Boring or penetrating the earth – Processes
Patent
1993-07-07
1994-10-18
Dang, Hoang C.
Boring or penetrating the earth
Processes
175103, 175135, 175162, 175171, 175173, E21B 600
Patent
active
053559665
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention refers to a drilling method for drilling a bore-hole in ground or soil, with a percussion drilling device operated directly in the bore-hole and with a rotary percussion drilling device operated from the surface of the ground or soil, both devices being received in a common support member and adapted to be simultaneously operated; and a drilling assembly for drilling a bore-hole in ground or soil, comprising a first percussion drilling device operated directly in the bore-hole, a second rotary percussion drilling device operated from the surface of the ground or soil, both said first and second devices being received in a common support member and adapted to be simultaneously operated.
PRIOR ART
A number of different drilling methods and drilling assemblies are known in the art for managing different drilling tasks with the consideration of different ground or soil compositions which can vary not only between one place and another one, but also from the surface of the ground or soil to the bottom thereof. Particularly, the hydraulically operated percussion drilling devices have proven to be effective, which comprise a percussion tube provided with a percussion drilling crown at their one end and which are driven by means of a hydraulically operated rotary impact drilling mechanism. The percussion tube is screwed into a holder which is connected to the rotary impact drilling mechanism whereby it must be ensured that the screwed connection of the percussion tube is not loosened during the drilling operation under the influence of the rotating and impact forces.
The document DE-AS (German Published Patent Application) Nr. 1,298,066 discloses an assembly for the superimposed drilling of holes in rocky ground covered with lose soil or scree materials. The assembly comprises an outer drilling tube with an outer drilling crown and an inner drilling tube with an inner drilling crown. The outer drilling tube and the inner drilling tube are connected to a common flush head member which is to be coupled to a drilling and/or percussion device. Thereby, close to the inner drilling crown, there is provided a deep hole hammer device which forms part of the inner drilling tube.
Further, the document DE-AS (German Published Patent Application) Nr. 1,909,931 discloses an assembly for the superimposed drilling of holes . The assembly comprises an inner drilling tube with an inner drilling crown and an outer drilling tube with an annular drilling crown which is connected to a percussion drilling device. There is provided a separate rotary percussion drilling drive comprising rotary driving means and percussion driving means for both the inner and outer drilling tubes, both of the drive means being controllable independently from each other.
Furthermore, the pneumatically or hydraulically operated percussion hammer devices, the so-called down-the-hole hammers, have also proven to be very effective. These devices also comprise a tube in which, at the one end thereof, there is provided the hammer device with a chisel. Thereby, in these devices, the tube has not to transmit impact forces or torque forces; thus, it is screwed in a holder by means of a simple normal right-handed thread. An impact and rotary effect is created directly, pneumatically or hydraulically, in the down-the-hole hammer device and transformed to the chisel which is an integral part of the hammer.
OBJECTS OF THE INVENTION
In many cases, under corresponding geological conditions, it would be desirable to simultaneously work with a pneumatic down-the-hole hammer situated in the bore-hole and with a percussion drilling machine which is hydraulically or pneumatically operated from the surface. However, this is not possible if the same installation is used, i.e. by providing a down-the-hole hammer in the interior of the impact tube of the percussion drilling device, because the impact forces directed to the percussion drill of the percussion drilling device also affect the down-the-hole hammer and possibly damage
REFERENCES:
patent: 2950087 (1960-08-01), Gregory
patent: 3227230 (1966-01-01), Lagerstrom
patent: 3231032 (1966-01-01), Genberg et al.
patent: 3682260 (1972-08-01), Klemm
patent: 3901331 (1975-08-01), Djurovic
patent: 5125464 (1992-06-01), Sabatier
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