DD147785A3 - DRILLING CUT TO REMOVE DRILLING SAMPLES - Google Patents

Abstract

The invention relates to a Bohrschnecke for taking drill samples in the form of a core of Boeden soft cohesive formations, wherein around the mantle of a rotatably mounted Auszenrohres a screw with expiring soil cutting edge and a fixed over a head piece of the Auszenrohres interchangeable inner tube with pre-cutting are arranged. In this case, the screw and inner tube should be designed so that a mechanically unloaded core is formed. This is achieved by providing, according to the invention, the turns of the screw from the headstock to the head piece with increasing pitch and with a shelf, and the head tube over an orb arranged in a pressure plate of the inner tube and in the area of the pre-cutting on a drill bit stored and the pre-cutting is formed with the headpiece groeszer expectant inner diameter.

Description

-4- 213 6 2

Title .

Auger for taking drill samples

Application of the invention

The invention relates to a drilling auger for taking drill samples, in the form of a core of soils of soft cohesive formations.

Characteristic of the known solutions

It is a Bohrschnecke for taking drill samples in the form of a core of soils of our cohesive formations geAvorden known, in which are arranged around the mantle of a rotatably mounted outer tube, a screw with leaking Bohremeide and a fixed over a head piece of the outer tube exchangeable inner tube with pre-cutting. The inner tube consists of peels, which are braced by rings. In addition, the inner tube has a core catcher in the area of the precut. Through this auger no undisturbed Bohrprobekerne be removed, since the core is exposed to mechanical stress during propulsion and removal, leading to the toil or complete destruction. Further destruction occurs by the fact that the preservation of the core requires a complicated fault-susceptible core catcher. In addition, entering water as well as clamping the auger also affects the core.

Object of the invention

The invention has the goal of producing a simple interference

free auger undisturbed drill core: to remove from the bottom of soft cohesive formations.

Characteristic of the invention

The invention has for its object to develop a drilling auger, the screw and inner tube is formed so that a mechanically unloaded core is formed.

This is achieved in that according to the invention, the turns of the screw from the precut to the head piece with increasing pitch and are provided with an outboard, and that the outer tube with the head piece arranged in a pressure plate of the inner tube ball and in the area of the pre-cutting on a drill bit stored and the pre-cutting is formed with increasing the head piece inner diameter. Furthermore, the head piece with pressure equalization openings and the pressure plate are provided with closable via a check seal openings.

embodiment

In one embodiment, the invention is explained in detail. The drawing shows the auger in principle.

The outer tube 1 is connected via the head piece 2 with the sleeve connector 3 and has the screw 4. In the head piece 2, the counter-plate 5 is arranged. In the outer tube 1, the inner tube 6 is arranged and mounted on the arranged in the pressure plate 7 ball 8 and the drill bit 9.

The turns of the screw 4 have from the drill bit to the head piece 2 an increasing pitch and are provided with the Außbenbord 10. The worm 4 is provided with the drill bit 11. The inner tube 6 has the precut 12, which d to the pressure plate 7 with increasing inner diameters. dp; d ^ is provided

 The pressure plate has the openings 15 through

the acted upon by the annular spring 14 balls 15 are closed.

The head piece 2 is provided with the pressure equalization openings.

The mode of action is the following:

Through the turns of the screw 4 and the outboard of the propulsion takes place so that the outer soil is relaxed and no soil can fall due to the centrifugal forces.

With progressive propulsion, the soil passes as a drill core via the precut 12 in the inner tube 6. Due to the larger v / erdenden inner diameter d . ; dpj cU; the core is also relaxed, so that it can no longer fall out of the inner tube 6. Special core catching devices are not required.

The absorbed into the inner tube 6 Y / asser passes through the openings 15 into the open. These openings 13 are then closed by the spring 14 acted upon by the balls 14 in the manner of a check valve. If the drilling process is completed, the auger is lifted, removed the head piece 2 and the inner tube 6 taken out. From the inner tube 6 then the undisturbed drill core can be removed

 The following advantages can be achieved by the invention:

1. Relaxed and undisturbed Bohrkerngev / nung as a soil sample by changing the diameter and storage of the inner tube.

2. Simple and trouble-free design by eliminating the core catching device

3. No clamping of the auger, as the recorded outer soil is relaxed and can not fall down.

Claims (2)

-h- 213627 invention claim Λ. Bohrschnecke for taking drill samples in the form of a core of soils soft cohesive formations, wherein around the mantle of a rotatably mounted outer tube a worm with expiring floor cutting edge and a fixed over a head piece of the outer tube exchangeable inner tube with pre-cutting are arranged, characterized in that the turns of Are provided from the precut to the head piece with increasing pitch and with an outboard, and that. the outer tube is mounted with the head piece via a ball arranged in a pressure plate of the inner tube and in the region of the pre-cutting on a drill bit, and the pre-cutting edge is formed with an inner diameter becoming larger than the head piece. 2. auger according to item 1, characterized in that the head piece with pressure equalization holes and die'Druckplatte are provided with closable via a check seal openings. For this 1 page drawings