Earthmoving device, pipe section and earthmoving method

Description

[0001] The invention relates to an earth-moving device, in particular for forming a blind hole in the ground, a pipe section for forming a pipe for such an earth-moving device and an earth-moving method for forming a hole in the ground.

[0002] Excavation devices for creating a blind hole in the ground are known from existing practice. These devices comprise a pipe formed by several interconnected pipe sections and a drilling device, such as a down-the-hole hammer, located at a free end of the pipe. The energy required to operate the drilling device is transmitted to the drilling device via separate lines, usually on the outside of the pipe. To protect the line, the borehole is drilled with a slightly larger diameter than the pipe, so that the lines do not come into contact with the surrounding soil and thereby become damaged.

[0003] GB 2 186 899 A discloses an earthmoving device comprising a pipe formed from several interconnected pipe sections, wherein the pipe sections have an outer pipe and an inner pipe arranged in the outer pipe and firmly connected to the outer pipe. WO 2015 / 171400 A1, WO 2014 / 046674 A1, DE 23 31 655 A1, and WO 2011 / 129841 A1 show further embodiments of interconnectable pipe sections.

[0004] The object of the invention is to create a particularly low-maintenance earth-moving device which enables efficient and rapid formation of holes in the ground.

[0005] The pipe sections of the pipe each have an outer pipe and an inner pipe arranged in the outer pipe and firmly connected to the outer pipe, wherein at least one channel is provided between the outer pipe and the inner pipe of the pipe sections, which channel extends continuously along the pipe. According to the invention, the channel increases in size in the circumferential direction on at least one end face of the pipe sections. Lines for operating a drilling device can therefore be arranged in a gap between the outer pipe and the inner pipe and are thus protected from external influences. In addition, the diameter of the borehole can correspond to the outer diameter of the outer pipe, so that no unnecessary excavation occurs and there is no risk of settlement of the ground.

[0006] In an advantageous embodiment, the pipe sections can be detachably connected to one another, in particular via a bayonet connection. The bayonet connection allows particularly high tensile forces in the longitudinal direction and torques in the closing direction of the bayonet connection to be transmitted, which also allows the pipe to rotate during the hole formation.

[0007] To mutually lock the adjacent pipe sections, at least one releasable locking means, in particular a locking bolt, can be provided, which preferably interacts positively with the pipe sections to prevent mutual loosening of the pipe sections, in particular mutual twisting of the pipe sections. By locking the bayonet connection in the closed position, unintentional loosening is prevented and torque transmission in the opening direction of the bayonet connection is enabled. After removing the locking means, the bayonet connection can be released in a known manner by mutual twisting in the opening direction.

[0008] As described, at least one channel is provided between the outer pipe and the inner pipe of the pipe sections, which channel extends continuously along the pipe. For this purpose, opposite outlet openings are preferably provided on the adjacent end faces of the pipe sections in the closed position of the bayonet connection, so that the channel extends uninterrupted through the pipe sections. At least one of the adjacent outlet openings can extend so far in the circumferential direction of the pipe section that a continuous channel is created through the pipe sections even when the bayonet connection is in the open position. This reliably prevents a line arranged in the channel from being sheared off or damaged when the bayonet connection is opened.

[0009] At least one line, in particular a cable for transmitting power and / or data and / or a hose for a fluid or a gas, can be arranged in the channel. This allows a drilling device arranged at the free end of the pipe to be supplied with energy, for example in the form of hydraulic pressure, and controlled via signal lines, for example in the form of electrical cables. In addition, operating materials such as a plastic sealing the borehole can be transported along the pipe and pressed into the ground at a desired location. The data from sensors, which can be arranged along the pipe or at the free end, can also be transmitted via signal lines to a measuring or evaluation unit outside the borehole.

[0010] Particularly advantageously, the earth-moving device can comprise a sensor for determining the hardness of the soil, in particular a ceramic sensor. This makes it possible to measure the hardness of the soil during hole formation and adjust the drilling process and / or to log or digitally record the measured values, preferably over the entire drilling depth.

[0011] The drilling device can, in particular, be a down-the-hole hammer and / or auger and / or a special drilling tool. The down-the-hole hammer can be located at the free end of the pipe and supported on the pipe, which is easily possible due to the high rigidity of the multi-walled pipe sections and the particularly stable bayonet connection. A (drilling) auger can be located inside the pipe and used to drill and remove the soil from the borehole.

[0012] The pipe sections of the earthmoving device can preferably be designed as described in detail below. Such a pipe section with an outer pipe and an inner pipe arranged in the outer pipe and firmly connected to the outer pipe is also claimed.

[0013] For example, to reliably guide a line, at least one channel is provided between the outer pipe and the inner pipe of a pipe section, extending along the pipe section from a first end face to a second end face. The channel can be delimited in the circumferential direction of the pipe section by webs that connect the inner pipe to the outer pipe and also extend in the longitudinal direction of the pipe section.

[0014] According to the invention, the channel expands in the circumferential direction on at least one end face of the pipe section, wherein, in particular, an end-face outlet opening of the channel can have a greater extent in the circumferential direction of the pipe section than in the radial direction. As described above, this can reliably prevent damage to a line arranged in the channel during mutual fastening of the pipe sections via the bayonet connection. Preferably, the outlet opening has such an extent in the circumferential direction that the free passage of the channel from one pipe section to the adjacent pipe section corresponds in cross-section at least to the cross-section of the line(s), even in the open position of the bayonet connection.

[0015] In order to enable stable mutual fastening of such pipe sections, a first coupling section with holding elements can be provided on a first end face of the pipe section, which holding elements are designed to correspond to counter elements of a second coupling section on a second end face of the pipe section. The holding elements and the counter elements can be designed as a bayonet connection as described, wherein in the closed position the holding elements of one pipe section engage behind the counter elements of an adjacent pipe section. The holding elements can, for example, be designed in the form of a plurality of radially outwardly projecting projections distributed in the circumferential direction of the pipe section, and the corresponding counter elements distributed in the circumferential direction of the pipe section can be designed in the form of radially inwardly projecting projections on the second coupling section.

[0016] For particularly simple production, the coupling sections can be formed by ring elements that are integrally connected, preferably by welding, to the inner pipe and the outer pipe. The coupling sections can be prefabricated particularly easily, preferably by machining such as milling or turning. The pipe section can be manufactured particularly easily by first attaching elements such as webs as a wall for the at least one channel to the outside of the inner pipe, preferably by welding, and then sliding the outer pipe over the inner pipe and integrally connecting it to the inner pipe via the coupling sections, preferably also by welding.

[0017] To enable a defined stop for the bayonet connection in the closed position, a stop element can be attached, preferably releasably, to at least one retaining element and / or to a counter element of a coupling section. The stop element forms a stop for the further coupling section in the circumferential direction, so that in the closed position of the bayonet connection, the coupling sections have a defined angular position.

[0018] Further advantageously, a preferably closable opening into a chamber can be provided in the outer pipe, preferably adjacent to a coupling section, and at least one through-bore can be arranged in a wall of the chamber towards an end face of the pipe section. As will be described in more detail with reference to the figures, a locking means can be inserted into the through-bore via the chamber, which protrudes at the end face, in particular into one of the counter elements and, for support, additionally into one of the radially protruding holding elements of the bayonet connection, whereby the bayonet connection is locked. By closing the chamber with a preferably curved cover, ingress of soil is reliably prevented and the circular outer diameter of the outer pipe is also maintained in the region of the opening.

[0019] For reliable sealing of two interconnected pipe sections, at least one sealing element, in particular a sealing or damping ring arranged in an annular groove, can be provided on each pipe section. The sealing element is preferably provided on an end face of the pipe section, wherein two sealing elements can be arranged particularly advantageously on one end face. To seal the channel between the outer pipe and the inner pipe, a first sealing element can be arranged with a diameter that is larger than the channel, and a second sealing element can be arranged with a diameter that is smaller than the channel.

[0020] Furthermore, an earthwork method for forming a hole in the ground is also claimed, in which a pipe composed of several pipe sections is used. The pipe sections can be designed as described above.

[0021] To connect a first pipe section to a second pipe section, a line arranged in a channel between the outer pipe and the inner pipe of the first pipe section is advantageously connected to a line arranged in a channel between the outer pipe and the inner pipe of the second pipe section. The pipe sections are then connected to one another, preferably by means of a rotary movement, in particular via a bayonet connection. This enables rapid mutual assembly of the pipe sections with a continuous line.

[0022] It is particularly advantageous to arrange the first pipe section in a borehole if the second pipe section is attached to the first pipe section. This allows holes to be formed in the ground particularly quickly, with the line only being interrupted briefly when inserting a new pipe section, for example, to operate a drilling device.

[0023] Further features and advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawings. They show: Fig. 1 a perspective view of a pipe section of an earthmoving device; Fig. 2 a first detailed view of the pipe section of Figure 1 ; Fig. 3 a second detailed view of the pipe section of Figure 1 ; Fig. 4a longitudinal section through the pipe section of Figure 1 ; Fig. 5 a first perspective view of the pipe section of Figure 1 without an outer tube and Fig. 6 a second perspective view of the tube section of Figure 1 without an outer tube.

[0024] In Figure 1A perspective view of a pipe section 1 of an earthmoving device is shown. The earthmoving device can be designed to form a blind hole, in particular a horizontal one, in the ground and can comprise a pipe for operating a drilling device, which pipe is formed by a plurality of such pipe sections 1. For the mutual connection of such pipe sections, the pipe section 1 has a first coupling section 2 on a first end face and a corresponding second coupling section 3 on an opposite second end face. As will be described in detail with reference to the following figures, the coupling sections 2, 3 form a bayonet connection, so that a plurality of such pipe sections can be detachably connected to one another.

[0025] The coupling sections 2, 3 are connected via an outer tube and an inner tube arranged in the outer tube and firmly connected to the outer tube, of which the outer tube 4 is shown. In the outer tube 4, adjacent to the first coupling section 2, several circumferentially distributed openings are provided, each opening forming a chamber. These openings are closed by a cover 5a, 5b.

[0026] A pipe formed by several such pipe sections can be used in the earthmoving device to operate a drilling device, in particular a down-the-hole hammer and / or auger and / or a special drilling tool. The drilling device can optionally be attached to the free end of the pipe via an adapter, for example, to the first coupling section of the outermost pipe section. A drilling device in the form of an auger can be rotatably arranged in the pipe and used for drilling at the free end of the pipe and for removing the soil through the pipe.

[0027] In Figure 21 shows a first detailed view of the pipe section 1 in the region of the first coupling section 2. As can be seen there, the bayonet connection on the first coupling section 2 comprises a plurality of holding elements 6a, 6b, 6c distributed in the circumferential direction and projecting radially from an annular extension with an outer diameter that is reduced compared to the outer pipe 4. A releasable locking means in the form of a locking bolt 7 with an external thread and a stop element 8 are additionally arranged on the holding element 6b. In the embodiment shown, such locking bolts and stop elements are provided on three of the total of six holding elements. As will be described in more detail with reference to the following figures, the locking bolt 7 and the other locking bolts (not numbered) can prevent the interconnected pipe sections from becoming detached from one another and, in particular, from rotating relative to one another.The stop element 8 forms a defined stop for the closed position of the bayonet connection. Furthermore, two end-face outlet openings 9a, 9b of channels within the pipe section 1 are shown, which are particularly suitable with respect to the . Figures 5 and 6 be described in more detail.

[0028] In contrast to the representation of Figure 1 The cover 5a, which was secured by unnumbered screws, is removed, and the chamber 10 located underneath is shown. The locking pin 7 can be inserted through the chamber 10, as well as the stop element 8, which is designed as a separate element.

[0029] In Figure 3 is a second detailed view of pipe section 1 of Figure 1 shown in the area of ​​the first coupling section 2. In contrast to the representation of Figure 2The locking pin 7 is shown removed from a receptacle formed by a through-bore 11a with an internal thread and a blind hole 12. The through-bore 11a extends from a wall of the chamber 10 to the end face with the first coupling section 2. In this position of the locking pin 7, a connection of the first coupling section 2 to a correspondingly designed second coupling section 3 of another pipe section is possible. As soon as the second coupling section 3 is in the closed position, i.e. a corresponding counter-element rests against the stop element 8, the locking pin 7 can be reinserted into the through-bore 11a and the blind hole 12 in order to mutually lock the adjacent pipe sections against rotation. In the Figure 6 In the corresponding counter element 14a shown, a corresponding through-hole 11c is also provided, through which the locking bolt then protrudes.

[0030] The stop element 8 is also secured via a bolt (not shown here), which is arranged in a through-hole 11b. The through-hole 11b extends through the first coupling section 2 with the holding element 6b and the stop element 8. After the bayonet connection has been mutually locked in the closed position by means of the locking bolt 7 in the chamber 10 and additional locking bolts (not shown) in other chambers, the chamber 10 can be sealed via the cover 5a, preferably via a separate sealing element, to prevent water or soil from penetrating the chamber 10.

[0031] In Figure 41 shows a longitudinal section through the pipe section 1. As can be seen there, the coupling sections 2, 3 are formed by ring elements, which are preferably integrally connected by welding to the outer pipe 4 and the inner pipe 13 arranged in the outer pipe. The coupling sections 2, 3 as well as the outer pipe 4 and the inner pipe 13 are preferably made of metal, in particular steel. As will be described in more detail with reference to the following figures, not only the chamber 10 but also at least one channel running in the longitudinal direction is provided in the gap between the outer pipe 4 and the coaxially arranged inner pipe 13.

[0032] As from Figure 4As can be further seen, the second coupling section 3 comprises a plurality of inwardly projecting counter-elements, of which the counter-elements 14a, 14b and 14c are numbered here. In the embodiment shown, a total of six holding elements, evenly spaced in the circumferential direction, are provided on the first coupling section 2 and, correspondingly, six counter-elements on the second coupling section 3. The holding elements and the counter-elements form a bayonet connection, in which, in the closed position of two interconnected and correspondingly designed pipe sections, one holding element engages behind the corresponding counter-element. The second coupling section 3, into which the first coupling section 2 projects, has the same outer diameter as the outer pipe 4, like the first coupling section 2, so that a uniform outer diameter of the pipe section results.

[0033] In order to reliably seal adjacent coupling sections 2, 3 of adjacent pipe sections, two sealing elements (not shown) are provided, which are arranged in annular grooves 15a, 15b of the first coupling section 2. Viewed in the axial direction of the pipe section 1, the outlet openings 9a, 9b and preferably also the retaining elements 6a, 6b, 6c, 6b are arranged between the annular grooves 15a, 15b to achieve a particularly reliable seal.

[0034] In Figure 5 is a first perspective view of pipe section 1 of Figure 1shown without the outer pipe 4. As can be seen there, a channel 16 is provided between the inner pipe 13 and the outer pipe 4 (not shown), which extends along the pipe section 1 from the first coupling section 2 to the second coupling section 3. The channel 16 is delimited laterally by walls 17a, 17b, which are designed as webs and are preferably welded to the inner pipe 13. The channel 16 opens into the outlet openings 9a in the first coupling section 2 and, opposite, into the outlet opening 9c in the second coupling section 3. A closed channel with the outlet openings 9a, 9c is formed via the outer pipe 4 (not shown), which delimits the channel 16 in the radial direction. Lines can be guided through the channel 16 along the pipe section 1, protected from the ground, from the first end face of the pipe section 1 to the opposite second end face.The cable may in particular be a cable for transmitting power and / or data and / or a hose for a fluid or gas.

[0035] Adjacent to the first coupling section 2, the channel 16 is enlarged in the circumferential direction and opens into the end-side outlet opening 9a, which also has a greater extent in the circumferential direction of the pipe section 1 than in the radial direction. The extension in the circumferential direction is preferably such that one or more lines arranged in the channel 16, which protrude beyond the outlet opening 9a and are connected to lines in an adjacent pipe section, are neither squeezed nor sheared off in the open position nor in the closed position when the adjacent pipe sections are rotated relative to one another to close the bayonet connection. The outlet opening 9a extends in the circumferential direction of the pipe section 1 preferably over an angular range which is greater than the angular range between the closed and open positions of the bayonet connection of the adjacent pipe sections.

[0036] In Figure 6 is a second perspective view of pipe section 1 of Figure 1 without the outer tube 4. As can also be seen from the illustration, the channel 16 delimited by the walls 17a, 17b opens into the end-side outlet opening 9c in the second coupling section 3, wherein the extension of the outlet opening 9c in the circumferential direction of the tube section 1 is smaller than that of the opposite outlet opening 9a. Also shown are the counter elements 14a-f, which protrude radially inward from the second coupling section 3.

[0037] In the illustrated embodiment, a locking pin corresponding to the locking pin 7 is provided on every second holding element on the first coupling section 2, so that corresponding through-holes are also arranged in every second counter-element, of which the through-hole 11c is numbered here. A releasable, positive locking of the bayonet connection is achieved via the through-holes and blind holes in the coupling sections 2, 3.

[0038] Using a corresponding earthwork method, several such pipe sections can be assembled particularly easily, resulting in a rigid pipe that can transmit high tensile forces and torques and also enables the protected routing of cables along the pipe. During the formation of a blind hole in the ground, once a certain advance of a drilling device and an already connected first raw section in the ground has been achieved, this first pipe section can be connected to a second pipe section. To do this, before the mutual connection via the bayonet connection, a cable arranged in a channel between the outer pipe and the inner pipe of the first pipe section is connected to a cable arranged in a channel between the outer pipe and the inner pipe of the second pipe section, and only then are the pipe sections connected to one another via the bayonet connection.

[0039] In an alternative embodiment not shown, a plurality of longitudinally extending channels can be provided in the pipe section, distributed circumferentially and opening into corresponding end-face outlet openings in the coupling sections. Alternatively or additionally, a sensor, in particular a ceramic sensor, can be provided on a pipe section to determine the hardness of the ground or other parameters. An outlet or nipple connected to a hose in a channel can also be provided on a pipe section, in particular on the side of the outer pipe. For example, a plastic, in particular a water-hardening plastic for sealing the borehole or a flushing agent for reducing friction can be pressed into the ground through the outlet. List of reference symbols:

[0040] 1Rohrabschnitt 2Erster Kopplungsabschnitt 3Zweiter Kopplungsabschnitt 4Außenrohr 5a, bAbdeckung 6a, 6b, 6c, 6d, 6eHalteelement 7Arretierbolzen 8Anschlagelement 9a, 9b, 9cAustrittsöffnung 10Kammer 11a, 11b, 11cDurchgangsbohrung 12Sackloch 13Innenrohr 14a, 14b, 14c, 14d, 14e, 14fGegenelement 15a, 15bRingnut 16Kanal 17a, 17bWand

Claims

1. Earthwork device, in particular for forming a blind hole in the ground, comprising a pipe intended for the operation of a drilling device and formed by a number of interconnected pipe sections (1), wherein the pipe sections (1) comprise an outer pipe (4) and an inner pipe (13), arranged in the outer pipe (4) and securely connected to the outer pipe (4), and, between the outer pipe (4) and the inner pipe (13) of the pipe sections (1), at least one duct (16) is provided, extending continuously along the pipe, characterized in that, at at least one end face of the pipe sections (1), the duct (16) increases in the circumferential direction.

2. Earthwork device according to Claim 1, characterized in that at least one line is arranged in the duct (16), in particular a cable for the transmission of power and / or data and / or a hose for a fluid or gas.

3. Earthwork device according to one of the preceding claims, characterized by at least one sensor for determining the hardness of the ground, in particular a ceramic sensor.

4. Earthwork device according to one of the preceding claims, characterized by a drilling device, in particular a down-the-hole hammer and / or an auger and / or a special drilling tool.

5. Earthwork device according to one of the preceding claims, characterized in that the pipe sections (1) are formed according to one of Claims 6 to 12.

6. Pipe section (1) for forming a pipe of an earthwork device, in particular an earthwork device according to one of Claims 1 to 5, comprising an outer pipe (4) and an inner pipe (13), arranged in the outer pipe (4) and securely connected to the outer pipe (4), wherein, between the outer pipe (13) and the inner pipe (4), at least one duct (16) is provided, extending along the pipe section (1) from a first end face to a second end face, characterized in that, at at least one end face of the pipe section (1), the duct (16) increases in the circumferential direction.

7. Pipe section (1) according to Claim 6, characterized in that an end face outlet opening (9a) of the duct (16) has a greater extent in the circumferential direction of the pipe section (1) than in the radial direction.

8. Pipe section (1) according to Claim 6 or 7, characterized in that, at a first end face of the pipe section (1), a first coupling section (2) is provided, having holding elements (6a; 6b; 6c; 6d; 6e) formed so as to correspond to counter elements (14a; 14b; 14c; 14d; 14e; 14f) of a second coupling section (3) at a second end face of the pipe section (1).

9. Pipe section (1) according to Claim 8, characterized in that the holding elements (6a; 6b; 6c; 6d; 6e) and the counter elements (14a; 14b; 14c; 14d; 14e; 14f) form a bayonet connection in which the holding elements (6a; 6b; 6c; 6d; 6e) engage behind the counter elements (14a; 14b; 14c; 14d; 14e; 14f) in the closed position of two interconnected pipe sections (1).

10. Pipe section (1) according to Claim 8 or 9, characterized in that a stop element (8) is preferably detachably fastened to at least one holding element (6b).

11. Pipe section (1) according to one of Claims 6 to 10, characterized in that a preferably closable opening into a chamber (10) is provided in the outer pipe (4), preferably adjacent to a coupling section (2), and at least one through-hole (11a) to an end face of the pipe section (1) is arranged in a wall of the chamber (10).

12. Pipe section (1) according to one of Claims 6 to 11, characterized by at least one sealing element, in particular a sealing ring arranged in an annular groove (15a; 15b).

13. Earthwork method for forming a hole in the ground using a pipe made up of a number of pipe sections, characterized in that the pipe sections (1) are formed according to one of Claims 6 to 12.

14. Earthwork method according to Claim 13, characterized in that, for connecting a first pipe section to a second pipe section, a line arranged in a duct between the outer pipe and the inner pipe of the first pipe section is connected to a line arranged in a duct between the outer pipe and the inner pipe of the second pipe section, and the pipe sections are subsequently connected to one another, preferably by means of a turning movement, in particular by way of a bayonet connection.

15. Earthwork method according to Claim 13 or 14, characterized in that the first pipe section is arranged in a borehole when the second pipe section is fastened onto the first pipe section.