EP2141322B1 - Soil drilling device - Google Patents

Description

Technical area

The invention relates to a Erdbohrvorrichtung with a rotary drive and connected to the rotary drive via a shaft drill head.

State of the art

For local excavation of soil, especially in cases where only very little space for excavation is available, it is used in a known manner manually operated tools, such as shovel, hoe and so-called universal joint blades that provide two blades that over a Joint are designed to grip soil.

In addition, earth augers are known, which have correspondingly large-sized Spindelbohrköpfe and provide based on the Archimedian principle for a vertical excavation. Such motor driven equipment is heavy and expensive.

In the US Pat. No. 7,185,720 B1 is a hand-boring device for a local Erdaushub described with a connected to a vacuum source suction line, which is surrounded by four stable longitudinal bars axially, the lower rod ends are formed tapered as a scratching tools. The Saugrohrende is spaced from the Kratzwerkzeugen and can by manually turning Extract the ground rods triggered soil by the suction line accordingly. The tapered tools opposite the tapered bar ends open into handle-like trained transverse struts, which allow manual handling of the drilling tool.

From the US 5,535,836 a drilling device for the introduction of boreholes is to be taken into the soil, which provides a connected to a vacuum source outer tube having a sawtooth structure at the pipe end facing the ground. Inside the outer tube, an inner tube is rotatably mounted manually or by motor means, to which at least one outlet nozzle for a preferably liquid or gaseous material flow is provided, through which the earth material can be detached. The loosened and detached earth material is disposed of appropriately by the vacuum applied along the outer tube.

Furthermore, the describes US 3,554,293 a device for weeding and folding particular lawns, which provides a cutting tool at the end of a motor-driven shaft, which is surrounded by a can-like configured protective cover. By lowering the cutting tool relative to the protective sheath, a near-surface removal of material is realized.

Of the DE 25 30 531 C2 shows a rotary drilling tool for earth drilling machines, in which the loosened by a mounted at the end of a rotatably mounted shaft drilling tool soil in a longitudinal axis of the drilling tool according to parent, bucket-shaped container is transferred. If the container is filled, the drilling tool closes off the otherwise downwardly open bucket, whereby the loosened soil can be removed in portions from the resulting wellbore.

With a similar principle, the excavation by means of a Erdlochschneiders according to the DE 203 01 785 U1 in which, as it were, a receptacle designed to be open at the bottom is filled by vertical lowering of a drilling tool with loosened soil, which, however, assumes such a high degree of compression within the receptacle that the receptacle can be removed vertically from the borehole.

The US 4,113,037 describes a stone drill with centering tip and Bohrstaubabsaugung.

Presentation of the invention

The object is to provide a Erdbohrvorrichtung, which is easy to use and is especially suitable for private garden or construction needs and therefore should represent a cost-effective alternative to existing systems. The auger is designed to allow a user to easily and quickly make holes with dimensions of up to one meter deep and a few decimeters in diameter.

The solution of the problem underlying the invention is set forth in claim 1. The concept of the invention advantageously further features are the subject of the dependent claims and the description in particular with reference to the embodiment shown in the figures.

According to the solution is a Erdbohrvorrichtung with a rotary drive, connected to the rotary drive via a shaft drill head and a pipe; is formed such that the shaft extends at least partially axially along the tube with two tube ends, the first tube end is connectable to a vacuum source and the second tube end provides a tube opening through which the drill head at least partially projects beyond the tube that the drill head at least two with the Shaft associated web portions provides that are mounted with a radial extent on the shaft and only partially cover the tube opening in projection to the tube axis, that the web portions are each connected to an axially oriented surface portion to form a U-shape, wherein the axially oriented surface portions each have a Having radially outwardly oriented surface which occurs during rotation of the drill head in sliding contact with the tube inner wall or an inner wall of a coaxially connected to the second tube end sleeve, and
in that the axially oriented surface sections are each connected to a leg which projects axially over the tube or the sleeve.

In an advantageous embodiment, legs are each radially outwardly inclined relative to the axially oriented surface portions such that the legs project radially beyond the outer diameter of the tube and / or the sleeve.

The Erdrohr device according to the invention will be explained with reference to the accompanying figures and described in more detail. For further nomenclature is agreed that the drill head is referred to as a scratching bar, which has the protruding sections, such as web sections, axial surface sections and the legs.

Brief description of the invention

Fig. 1 a,b

schematisierte Längsschnitte durch zwei lösungsgemäße Alternativen für eine Erdbohrvorrichtung,

Fig. 2

axiale Draufsicht auf den Erdbohrerkopf gemäß der in Fig. 1 b dargestellten Erdbohreralternative,

Fig. 3 a,b

Querschnittdarstellungen durch den Verbindungsbereich von Wellenantrieb zu flexiblen Saugschlauch,

Fig. 4

axiale Draufsicht auf und Längsschnitt durch einen Erdbohrerkopf,

Fig. 5

Längsschnitt durch einen Erdbohrerkopf mit axial aus dem Saugrohr geschobenen Erdbohrerkopf,

Fig. 6-8

alternative Ausführungsformen für Kratzbügel am Erdbohrerkopf,

Fig. 9, 10

alternative Befestigungen einer Laufbuchse am Saugrohr,

Fig. 11

Gesamtdarstellung einer Erdbohreranlage,

Fig. 12

Sicherheitsklappe am Saugschlauch und

Fig. 13

Variante für einen Sauglader mit hydraulisch gesteuertem Saugrohr für das Bohren von größeren Löchern.

The invention will now be described by way of example without limitation of the general inventive idea by means of embodiments with reference to the drawings. Show it:

Fig. 1 a, b

schematic longitudinal sections through two solutions according to the solution for an earth boring device,

Fig. 2

axial plan view of the auger head according to the in Fig. 1 b illustrated earth auger alternative,

Fig. 3 a, b

Cross-sectional views through the connection range of shaft drive to flexible suction hose,

Fig. 4

axial plan view and longitudinal section through an auger head,

Fig. 5

Longitudinal section through an auger head with an auger head pushed axially out of the suction tube,

Fig. 6-8

alternative embodiments for scratching posts on the auger head,

Fig. 9, 10th

alternative attachments of a liner on the intake manifold,

Fig. 11

Overall view of an auger installation,

Fig. 12

Safety flap on the suction hose and

Fig. 13

Variant for a suction loader with hydraulically controlled suction pipe for drilling larger holes.

Ways to carry out the invention, industrial usability

The FIG. 1 a shows a longitudinal section through a solution according trained Erdbohrerkopf. The FIG. 1b shows a longitudinal section through an alternative embodiment of an inventive Erdbohrerkopf, to which in FIG. 2 an axial plan view of the auger head is shown. The earth boring head according to FIG. 1a differs from that according to FIG. 1b only in the training of the later described Kratzbügels 1, so that the further description refers to the entirety of the FIGS. 1a . b such as FIG. 2 ,

A scratching clip 1 is set in rapid rotation via a bending and torsion-elastic shaft 2. About a bushing 3 made of steel, which reduces wear, a suction pipe 4 is held centrally above the Kratzbügel 1. Due to the rotation, the elasticity and the unilateral striking of the scratching clamp 1 at the contact points 5 in the borehole 6, this is forced into a kind of tumbling or scraping movement 9. This results in new contact points 5 with the numbers a, b, c, d etc. ( Fig. 2 ), whereby the hole 6 is "knocked out" to a larger diameter than that of the Kratzbügels 1 and a uniform deep drilling is possible. By this "scraping" the entire fine-grained material of the soil is released, which is then removed via the Absaugquerschnitt 7 immediately from the wellbore 6. The rotating Kratzbügel 1 prevented Furthermore, that larger stones clog the suction tube 4, as they are immediately thrown away from the suction cross section 7.

As a result of the larger borehole resulting from the scratching or scraping movement, scavenging air 8 flows into the borehole 6 and transports the loosely ground soil through the suction pipe 4 to a excavation collector 10. The scavenging air 8 is conveyed through the air in the borehole resulting negative pressure from the environment around the borehole drawn into this.

The scratching and striking motion also produces a bending vibration of the shaft 2 and a jarring of the suction pipe 4, which prevents sticky material (e.g., damp clay) from sticking to the inner walls of the suction pipe 2.

Larger stones remain in the hole back, which can be removed later with a suction tube without shaft or by hand.

The formation of the Kratzbügels 1 in the in FIG. 1 A illustrated embodiment is basically U-shaped. Thus, the Kratzbügel 1 two with the shaft (2) connected to web portions (S), which are mounted with a radial extent on the shaft (2) and only partially cover the pipe opening in projection to the pipe axis. The web portions (S) each pass, preferably integrally into an axially oriented surface portion (18a, 18b) whose radially outwardly oriented surface during rotation of the drill head in sliding contact with the tube inner wall or an inner wall of coaxially connected to the second tube end sleeve ( 3) occurs. The axially oriented surface portions (18a, 18b) are axially extended so that they each, preferably in one piece in the tube (2) or the sleeve (3) axially superior legs (18c, 18d) pass or are connected thereto.

In contrast, the Kratzbügel 1 at the in FIG. 1b illustrated embodiment with respect to the axially oriented surface portions (18 a, 18 b) radially outwardly inclined legs (18 c, 18 d), which Outer diameter of the tube (4) and / or the sleeve (3) protrude radially. Such a scratching bar is in the FIGS. 4 and 5 explained in more detail.

The Fig. 3 a, b show a version for the drive of the shaft 2 and the connection to a flexible suction hose 12 to a Aushubsammler 10, the FIG. 11 is shown.

According to the embodiment in FIG. 3a the shaft 2 is clamped along a flat 2 a via a clamping screw 13 in a clamping seat 14 with integrated flywheel 14 a. A wire clamp 15 prevents friction by slipping out of the shaft 2 during fastening and aligns the flattening 2a to the screw 13.

In contrast, the wave is at the in FIG. 3b illustrated embodiment via a clamping mechanism with two fastening screws 13 clamped in a clamping seat 14 with integrated flywheel 14a.

The clamping seat 14 is clamped by a hexagon 14 b fixed in an electric hand drill 11.

By the flywheel 14a and the torsional elastic wave 2, the drill 11 is decoupled from the rotational strokes of the Kratzbügels 1. This results in a relatively quiet running of the drill 11, which not only better handling, but also the protection of the drilling machine mechanism is used.

To replace the shaft 2, only the screws 13 must be solved and the clamping seat 14 are deducted. Subsequently, the shaft 2 can be pulled out with integrated scratching bracket 1 from the suction pipe 4 in the opposite direction.

On a manifold piece 16, a bracket 17 is fixed, through which the manifold piece 16 is centered to the shaft 2. The bracket 17 is formed so that a surface 17 a the clamping seat 14 with a defined distance 18 is parallel opposite. The distance 18 allows the suction tube 4 together with elbow piece 16 to pull the clamping seat 14 and so release the bushing 3 relative to the scratching bar 1. The released position is in Figure 5 shown.

In addition, a slip clutch 19 is attached to the connection between manifold piece 16 and intake manifold 4. The slip clutch 19 is realized here by way of example via a rubber ring 19 a, which forms a frictional connection between the manifold piece 16 and the intake manifold 4. The thus formed slip clutch also allows easy replacement of the suction tube 4, if this is worn.

For the rare case that despite the spin movement of the Kratzbügels 1 a stone has jammed in the Absaugquerschnitt 7, the slip clutch 19 prevents an abrupt "eating" of the device. After switching off the hand drill 11 can now be released relative to the bushing 3 by pulling back over the path length 18 of the suction tube 4 with manifold piece 16 of the scratcher 1 and thus the jammed stone can be removed easily and quickly.

If a stone is already in the suction tube 4 and has jammed with the shaft 2, the pushing back and releasing also allows for easier removal, since the suction tube 4 then tilts against the shaft 2.

After removal of the jammed stone, the suction pipe 4 is again brought into the centered position by the scratching clamp 1 is rotated again and the suction pipe 4 is slightly pushed with Krümmerstück 16 in the direction of the scratching clamp 1.

Due to the closed round shape of the Kratzbügels 1 in the direction of the suction pipe 4, the liner 3 catches itself and centered so the suction tube 4 relative to the This scratching operation is also possible during drilling, so that scratching without simultaneous suction can be performed. This is for example advantageous if the hole is to be widened laterally.

Fig. 4 shows again the scratching clamp 1 with suction tube 4, according to the in Figure 1 b shown embodiment. Decisive for the function is the combination of a jolting / beating scratching bracket 1 with the free-hold function of Absaugquerschnitte 7.

By at least two axially parallel surfaces 18 a and 18 b of the Kratzbügels 1, which are connected via the web portions S to the shaft 2, for example. By means of a welded connection, a sliding of the Kratzbügels 1 on the inner surface of the bushing 3 is made possible. As a result, the suction pipe 4 can be held centrally above the scratching bar 1, whereby the suction cross section 7 remains almost unchanged in its shape. This is an important factor to prevent jamming of stones. In addition, by the angled legs 18 c and 18 d, which open against the suction direction and turn quickly, virtually all the stones thrown out of the suction, which do not fit through the Absaugquerschnitt 7.

The legs 18c and 18d further protrude beyond the outer diameter 20 of the suction tube 4 and thus support the required Rüttel- and impact function for breaking out of solid material. In addition to supporting the protruding shaft 21 acts when keeping away from large stones from Absaugquerschnitt 7 and facilitates immediate throwing away again.

Fig. 6 shows a variant of the Kratzbügels with soldered carbide cutting edges 22 to extend the life.

Fig. 7 shows a variant with 3 cutting which depending on the soil properties can prove advantageous. It should be noted that even more cutting are possible, which are not shown here.

Fig. 8 shows a variant of the Kratzbügels 1 as a cast construction with welded shaft 2. To recognize here is especially the back round shape which allows the catching of the bushing 3.

Fig. 9 shows a variant of the attachment of the bushing 3 on the intake manifold 4 with axial slots 25 and rivets.

In Fig. 10 is a version with a remote socket with rivets shown.

In Fig. 11 is a complete configuration with hand drill 11, excavator 10 and industrial vacuum cleaner 23 shown. The industrial vacuum cleaner 23 sucks air from the excavation collector 10 via a coarse screen 10a. The coarse sieve 10a prevents larger stones from getting into the filter bag of the industrial vacuum cleaner 23 and filling it quickly. By this separation, it is possible to deposit large amounts of excavation in Aushubsammler 10 without particulate matter enters the environment, which is retained in the filter bag.

In order to increase the suction power on the scratching bar 1, moreover, several industrial vacuum cleaners 23 can be connected to the excavation collector 10 via the coarse sieve 10a.

It is possible that too low air flow in the suction hose 12, the material to be delivered can not be transported. To prevent this, a spring-loaded flap 24 can be mounted just behind the intake manifold 16 (see FIG Fig. 12 ), which opens when the air flow over the Kratzbügel 1 too low, ie the negative pressure in the suction hose 12 is too large.

For the same reason, as in Fig. 9 and Fig.10 shown, air inlet openings 25 are mounted directly behind the (not shown here) scratching 1.

Fig. 13 shows a variant of a suction loader with hydraulically controlled suction pipe 26 for drilling larger holes from a truck or train car.

Here, the suction tube 26 can not resonate, since it is rigidly attached to a hydraulic arm (not shown). In order to still allow the shaking or scraping movement, the vertical part 26a of the suction pipe is articulated via an elastic bellows 27.

In the case of rigid clamping of the drive motor 28, an elastic drive shaft 29 is also necessary here in order to enable the shaking function. A flywheel 30 is also attached here to protect the drive motor 28 directly to this.

• Ausheben von Erdlöcher, z.B. zum Setzen von Zaumpfählen oder Pfosten aller Art
• Ausgraben an Mauerdurchbrüchen für Elektro- oder Wasserinstallation
• Ausgrabungen an unzugänglichen Stellen allgemein
• Ausgraben und Aussaugen von verschlammten Schächten (nass und trocken)
• Säubern von Hohlräumen allgemein

Possible applications:

• Excavation of burrows, eg for setting of bridle posts or posts of all kinds
• Excavation of wall openings for electrical or water installation
• Excavations in inaccessible places in general
• Excavation and sucking out of silted shafts (wet and dry)
• Cleaning cavities in general

Claims (13)

1. A ground drilling apparatus with a rotary drive, a drill head connected to the rotary drive via a shaft (2), and a pipe (4), characterised in that the shaft (2) runs at least partially axially along the pipe (4) with two pipe ends, the first pipe end whereof can be connected to an underpressure source and the second pipe end whereof provides a pipe opening via which the drill head at least partially protrudes beyond the pipe (4), that the drill head provides at least two web sections (S) connected to the shaft (2), said web sections being fitted with a radial extension to the shaft (2) and covering the pipe opening only partially in the projection of the pipe axis, that the web sections (S) are each connected to an axially orientated flat section (18a, 18b) thereby forming a U-shape, that the axially orientated flat sections each comprise a surface orientated radially outwards, said surface entering, when the drill head is rotated, into sliding contact with the pipe inner wall or an inner wall of a sleeve (3) connected coaxially to the second pipe end, that the axially orientated flat sections (18a, 18b) are each connected to a leg (18c, 18d) protruding axially beyond the pipe (4) or the sleeve (3).
2. The ground drilling apparatus according to claim 1,
   characterised in that the legs (18c, 18d) are inclined radially outwards with respect to the axially orientated flat sections (18a, 18b), in such a way that the legs (18c, 18d) protrude radially beyond the outer diameter of the pipe (4) and/or the sleeve (3).
3. The ground drilling apparatus according to claim 1 or 2,
   characterised in that the rotary drive is a portable drilling machine (11), in the drill chuck whereof the shaft (2) is fixed ending at one side.
4. The ground drilling apparatus according to any one of claims 1 to 3,
   characterised in that a flywheel (14a) is fitted along the shaft (2) in the region of the rotary drive.
5. The ground drilling apparatus according to any one of claims 1 to 4,
   characterised in that the shaft (2) is constituted torsionally elastic and/or flexurally elastic.
6. The ground drilling apparatus according to any one of claims 1 to 5,
   characterised in that the sleeve is made of a wear-resistant material and the pipe is made of plastic.
7. The ground drilling apparatus according to any one of claims 1 to 6,
   characterised in that the first pipe end is connected via a slip coupling (19) to an elbow piece, which is constituted as a bent piece of pipe, in the elbow-piece wall whereof an opening is provided, through which the shaft is passed, and
   that the elbow piece provides an elbow opening, the associated opening surface whereof comprises a surface normal which intersects the pipe axis at an angle not equal to 0°.
8. The ground drilling apparatus according to claim 7, characterised in that the angle amounts to 90°.
9. The ground drilling apparatus according to claim 7 or 8,
   characterised in that the elbow opening of the elbow piece is connected to a connecting pipe, which is connected indirectly or directly to an underpressure source.
10. The ground drilling apparatus according to any one of claims 1 to 9,
    characterised in that the transition in each case between the web sections (S) and the axially orientated flat sections (18a, 18b) takes place via a rounded transition contour, by means of which axial sliding-in of the drill head into the pipe or into the sleeve is facilitated.
11. The ground drilling apparatus according to any one of claims 1 to 10,
    characterised in that the shaft is mounted so as to be axially displaceable along in the pipe.
12. The ground drilling apparatus according to any one of claims 1 to 11,
    characterised in that carbide cutting edges are fitted in the region of the legs (18c, 18d).
13. The ground drilling apparatus according to any one of claims 1 to 12,
    characterised in that the web sections (S) connected to the shaft, the flat sections (18a, 18b) and the legs (18c, 18d) are connected to one another in one piece.

Images