Method and device for releasing a block on a bore crown during a boring process
a technology of releasing a blockage and a drill bit, which is applied in the direction of drilling drives, drilling pipes, borehole/well accessories, etc., can solve the problems of increasing the amount of money and material, the drill bit is blocked, etc., and achieves the effect of reliable coupling and easy design
Inactive Publication Date: 2009-05-28
ALWAG TUNNELAUSBAU GMBH
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Benefits of technology
"The present invention provides a method and device for releasing a blockage of a drill bit during a drilling procedure. The method involves subjecting the drill bit to a linear movement opposite the drilling direction and a rotational movement in a direction opposite the direction of rotation during the drilling procedure. This allows for the simultaneous achievement of a linear extraction movement and a rotational movement, which enables the drill bit to disengage from a jammed or blocked state caused, for example, by slight shifts of adjacent rock layers. The device includes a spiral-shaped or helicoidal connection between the drill bit and the drill rod assembly, which acts upon the drill bit to perform a rotational movement in a direction opposite the direction of rotation during the drilling procedure independently of a rotary drive. This allows for the easy and reliable release of the blockage of the drill bit and the continuation or completion of the drilling procedure."
Problems solved by technology
In such cases, the rotary drive of the drilling or boring device for the production of a bore, as a rule, is insufficiently strongly dimensioned to overcome forces occurring at a shift of rock layers and, hence, again release the blocked state of the drill bit.
In the least favorable case, the drill rod assembly too will have to remain in the incomplete borehole such that, in addition to the fact that the production of a new bore, which will have to be located substantially immediately adjacent to the incomplete borehole in order to achieve the required strength properties, will involve increased time expenditures, also accordingly increased amounts of money and material will be caused by the drill rod assembly remaining in the borehole and the drill bit having to be left within the borehole in any event.
Method used
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[0025]From FIGS. 1 to 4, it is apparent that an adapter 3 is provided between a drill bit or bore-crown generally denoted by 1 and a drill rod assembly or boring rod generally denoted by 2, said drill rod assembly 2 being connected with the adapter 3 via a screw connection schematically indicated by 4, the adapter 3 being separately illustrated in FIG. 5.
[0026]As is, in particular, apparent from FIG. 5, the adapter 3, on the outer periphery of its end 6 facing the drill bit 1, comprises a plurality of helicoidal or spiral-shaped depressions 7 having large pitches or inclinations relative to the longitudinal axis schematically denoted by 8 in FIG. 3. The helicoidal or spiral-shaped depressions or connections or profilings 7 provided on the outer periphery of the end 6 of the adapter 3 cooperate with point-shaped or semispherical elevations 9 of the drill bit, which are illustrated in more detail in FIGS. 3 and 4 and which enable the reliable fixation of the drill bit 1 to the adapter...
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The invention relates to a method and a device for releasing a block or blockage on a bore-crown or drill bit (1) during a boring process, especially percussion boring or rotary percussion boring or drilling, for boring holes in the ground or rock, whereby a borehole is formed by a bore-crown (1) mounted on a boring rod or a drill rod assembly (2) and connected thereto and acted upon by the boring rod to generate a rotational movement and optionally a percussive movement. According to the invention, when the bore-crown (1) is blocked, preventing the continuation of the boring process and especially another rotational movement of the bore-crown (1), the bore-crown (1) is subjected to a linear movement in the opposite direction to the boring direction by means of the boring rod (2), and to a rotational movement in a direction opposing the direction of the rotational displacement during the boring process by means of a corresponding connection (7, 9) between the end of the boring rod (2) facing the bore-crown (1), and the bore-crown (1), independently of a rotary drive for carrying out the boring process. As a result the borehole can be bored in a simple manner after releasing the block on the bore-crown (1).
Description
[0001]This is a national stage of International Application No. PCT / AT2006 / 000338 filed on Aug. 11, 2006 and published in German.FIELD OF THE INVENTION[0002]The present invention relates to a method for releasing a blockage of a drill bit or a bore-crown during the drilling, particularly percussion or rotary percussion drilling or boring, of holes in soil or rock material, wherein a borehole is formed by a drill bit mounted on a drill rod assembly or boring rod and connected thereto and acted upon by the drill rod assembly to perform a rotational movement and optionally a percussive movement. The present invention further relates to a device for releasing a blockage of a drill bit during the drilling, particularly percussion or rotary percussion drilling, of holes in soil or rock material, wherein a drill bit is mounted on a drill rod assembly and acted upon by the drill rod assembly to perform a rotational movement and optionally a percussive movement for the formation of a borehol...
Claims
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IPC IPC(8): E21B7/00E21B6/00E21B12/00
CPCE21B31/00E21B17/073E21B31/03
InventorMOCIVNIK, JOSEF
OwnerALWAG TUNNELAUSBAU GMBH