HK1217310B - Cleaning device for cleaning a base of a borehole and method for creating a foundation element - Google Patents

Description

The invention relates to a cleaning device for cleaning a borehole floor in the ground, with a pumped device which allows sedimented soil material to be sucked out of the borehole floor area via a suction opening and drained out of the borehole via a suction line, as defined in claim 1.

The invention also relates to a method for creating a foundation element by introducing a borehole into a soil, which is filled with a hardenable suspension that curds to the foundation element, and by lowering a cleaning device to the bottom of the borehole before hardening the foundation element, which sucks sedimented soil material into the bottom area through a suction opening and removes it, as described in the general concept of claim 8.

In particular, for the construction of structures, drill piles are produced in the ground. In this case, a hole is first created in the ground, which is already provided with a suspension when drilling or only after the completion of the drilling work.

The load bearing capacity of a drill rig is significantly affected by the boundary layer between the drill rig and the adjacent soil, whereas loose soil material which is sedimented during the drill hole construction to the bottom of the hole is known to have a negative impact on the lifting surface and thus the load bearing capacity of the drill rig.

It is known that, after drilling, a submersible pump is used to remove such loose soil material from the borehole bottom and drain it from the borehole via a suction line into the suspension borehole as a cleaning device.

With such a cleaning device, loose soil material may remain on the borehole as the distance from the suction opening increases, so that no complete cleaning of the borehole is achieved with such a cleaning device.

It is also known that loose soil material is removed mechanically from the borehole by a box drill, for example, but this mechanical method of excavation may leave a certain amount of loose soil material on the bottom of the borehole.

A device of this type is shown in EP 2 481 490 A1.

From EP 1 491 716 A2 a drilling tool with a pumped device is known which can be used to convey worn-out soil material into a receptacle of the drilling tool.

A device and a method for filtering suspensions in boreholes is given in DE 28 07 917 A1.

A cleaning device is known from US 5.033.545 A, whereby rinsing fluid is pumped from above to the bottom of the borehole, turning the suction pump and a rotor cloudy.

The purpose of the invention is to specify a cleaning device for cleaning a borehole floor and a method for creating a drill bit to remove loose soil material from a borehole floor in a particularly reliable and efficient manner, thus allowing a high-quality foundation to be produced economically.

The problem is solved by a cleaning device with the characteristics of claim 1 and by a process with the characteristics of claim 8 and preferred embodiments of the invention are given in the respective dependent claims.

The cleaning device of the invention is characterised by the presence of at least one flushing line, which generates a flushing jet that exits from the cleaning device and flushes sedimented soil material from the bottom of the borehole.

The basic idea of the invention is that sedimentary soil material at the borehole bottom is not simply sucked or mechanically drained. Rather, the cleaning device produces a flush steel or a variety of flush jets that flush the sedimented soil material from the borehole bottom and swirl it up. The soil material thus swirled into the liquid in the borehole can be more easily sucked up and drained out of the borehole by the suction opening of the cleaning device. Through this flushing of the borehole bottom a very clean separation surface can be achieved between the borehole and the solid, adjacent soil. This can then create a foundation with a defined lifting surface and with good lifting resistance and load-bearing capacity.

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The invention provides that a particularly good flushing is achieved by providing at least one flushing arm on which the flushing arm is located. The long flushing arm can extend sideways or radially away from the cleaning device. In this way, the flushing arm can particularly reliably flush the corner area at which the borehole soles into the essentially vertical borehole wall, especially from deposited ground material. These corner areas are of particular importance for the stability and bearing capacity of a drill shaft to be formed.

A further improvement of the flush is provided by a variation of the invention in that several flush arms are provided, which extend radially to a centre axis.

A further improvement in the drill hole cleaning process is the invention of at least one flush arm attached to a rotor, which is rotatably mounted and driven around a centre axis, allowing one or more flush arms to move over a circular borehole and to flush off deposited loose ground material with particularly high reliability.

Another preferred embodiment is that at least one coil is mounted on at least one rolling body, which is rotatable and arranged around a rotating axis. The rotating axis can preferably be arranged horizontally, for example. This allows drilling holes with a longitudinal or angular ground plan to be cleaned. Instead of a longitudinal rolling body, several disc-shaped rolling bodies can also be mounted along the rotating axis. The coil axes can be aligned so that the rolling beams exit radially or tangentially.

In principle, it is possible to produce rotational motion of the rotor or the rolling body by a separate rotary motor, such as an electric motor or a hydraulic motor. A particularly robust and simple solution is achieved by creating rotational motion of the rotor or the rolling body by a spindle. In the case of a vertical axis, at least one spindle is not only oriented vertically, but in a perimeter direction. In particular, a spindle or several spindles can be arranged in a horizontal direction in perimeter, i.e. perpendicular to a radial spindle arm.

The pump device or a separate pump unit is also used to generate the spray jet. According to the invention, the pump device sucks sedimented soil material together with liquid into the borehole, with some of the sucked liquid being discharged via a branch line to at least one spool to form the spool. The pump device in the cleaning device thus does not generate a suction stream alone, with the cleaned soil material sucked in together with liquid and discharged from the borehole via a suitable suction line. Rather, according to the invention, in this embodiment, the central pump is also directed to generate the spool or the spool.

According to another design of the invention, it is advantageous to provide a spacer ring that surrounds the rotor or the roll body. The cleaning device is placed in the middle of the borehole above the sole. In the case of a rotor, it is rotatable around a central axis of the cleaning device. To prevent damage to the rotor with the coils by contact with the drill application, a drum-shaped spacer ring is provided, which is fixed to the housing of the cleaning device via connecting strips. The spacer ring has a larger diameter than the rotor and is concentrically placed to this. In this way, unwanted collisions of the rotor with the ground can be prevented, which will prevent the rotor from colliding with the other shapes of the drill material.

In addition, according to one design of the invention, it is convenient to place the pump device in a housing that is retractable to the bottom of the borehole, which has a connecting device to be attached to a drill bar or a lifting rope, which allows the housing to be lowered to the bottom of the borehole, or alternatively, the pump device of the cleaning device can also be located outside the borehole, whereby the pump device is then connected to the housing and the suction opening by a suction line.

Furthermore, the invention makes it advantageous to have at least one coil lens and/or at least one arm adjustable, so that the coil lens can be changed in its direction of flushing.

The initial problem is solved in terms of the process by using a cleaning device with at least one flush line, which produces a flush stream, which flushes sedimented soil material from the bottom of the borehole.

In particular, a cleaning device as described above may be used to perform this process. The method of the invention allows a foundation element with particularly good load bearing capacity to be produced by reliably cleaning a borehole base from sedimented loose soil material. Since the lifting surface of a borehole contributes a substantial part to the load bearing capacity of a borehole, the method of the invention can produce boreholes with increased load bearing capacity without major economic effort.

A preferred embodiment of the invention is that the one which moves at least one spool over the borehole bottom is driven by rotation, in particular, so that a reliable free-rolling and cleaning of the borehole bottom can be achieved with a single spool or a relatively small number of spools.

A particularly economical implementation of the process is obtained after further development of the invention by means of a movement of at least one spool-line by means of a recoil of the spool-line.

The following is a further explanation of the invention by means of a preferred example of an embodiment, which is shown schematically in the accompanying drawings. Figure 1: a schematic cross-sectional view of a cleaning device according to the invention in a borehole; Figure 2: a perspective view of the cleaning device from Figure 1; Figure 3: a perspective view from below of the cleaning device according to the invention from Figures 1 and 2; Figure 4: a side view of the cleaning device from Figures 1 to 3; Figure 5: a conventional state-of-the-art cleaning device in a borehole from a side view; and Figure 6: a perspective view of the cleaning device from Figure 5 from above.

In Figures 5 and 6, a cleaning device 110 is shown in accordance with the state of the art. The cleaning device 110 is essentially a submersible pump which is immersed in a borehole 2 equipped with a liquid supporting suspension. In particular, when the borehole 2 is being constructed, soil material falls off the wall 4 and forms a layer of sedimented soil material on a socket 6 of the borehole 2.

As the distance from the cleaning device 110 increases, the suction capacity decreases, so that, in particular, in the peripheral or corner areas of the bottom 6 of hole 2, some sedimented soil material 8 may remain.

An improved cleaning of the bottom 6 of borehole 2 from sedimented soil material 8 is achieved by a cleaning device 10 according to the invention, as illustrated in Figures 1 to 4 for a cylindrical borehole 2 and explained below.

The cleaning device 10 of the invention has a central, drum-shaped housing 12 in which a pump device 14 is located. As in the previous state of the art, a suction opening 16 at the bottom of the housing 12 sucks up suspension in borehole 2 together with sedimented soil material from the bottom 6 of borehole 2 and is carried upwards, particularly outside borehole 2, via a partially-drawn suction line 20 in particular. On the top of the housing 12 there is a suspension line 18 by which the cleaning device 10 is suspended on a rope and suspended in the borehole 2 created by the suspension line. The above suspension line 18 cannot be drawn by a supply line, in particular a hydraulic or electrical power supply line.

To improve cleaning of the 6th hole of borehole 2 a rotor 30 is formed below the suction vent 16 with three evenly spaced and radially oriented sink arms 32 each having a variety of sink slots 34 and is mounted on the housing 12 via a rotating connecting device not shown.

A branch line 22 diverts part of the fluid flow in the exhaust line 20 and leads it down to a hub 31 of the rotor 30. The flow distribution is adjustable via a slide 24 in the exhaust line 20. From the central hub 31 the diverting fluid is directed through the hollow sink arms 32 to the spools 34. By adjusting the slide 24 and the pump equipment 14 accordingly, the diverting fluid from the spools 34 exits under pressure and forms a spool 35. A substantial part of the spools 34 is arranged so that the spools are directed to the bottom 6 borehole with the sedimented soil material 8 so that the bottom 6 of the sedimented soil material 8 spools is released. The soil is deflated and the spool 8 is deflated through the bottom 20 hole and the exhaust material 12 is deflated through the drainage.

At the rotor 30 two spools 34 are arranged at the outer free ends of the spool arms 32 so that they are oriented perimeterwise. These perimeterwise oriented spools 34 produce radii 35 pointing perimeterwise, as shown schematically in Figure 3. The recoil principle moves the rotor 30 in a counterclockwise motion, as shown by the arrow in Figure 2.

To protect the rotor 30, a cylindrical spacer ring 40 is mounted on the housing 12 via the 42 support strips to protect the rotor 30. The wall of the spacer ring 40 is formed by a sheet in which a large number of passage openings are inserted.

Claims (9)

1. Cleaning device for cleaning a bottom (6) of a borehole (2) in the ground, with a pumping means (14), through which sedimented ground material in the region of the bottom (6) of the borehole (2) can be sucked away via a suction opening (16) and discharged from the borehole (2) via a suction line (20), where at least one flushing arm (32) with at least one flushing nozzle (34) is provided by which a flushing jet (35) can be produced which exits the cleaning device (10) and flushes sedimented ground material (8) from the bottom (6) of the borehole (2), wherein the at least one flushing arm (32) is mounted to be rotatable about a middle axis, characterised in that the at least one flushing arm (32) is arranged on a rotatable rotor (30), wherein a rotation movement of the rotor (30) can be produced by a flushing jet (35) being directed in circumference direction due to a blow-back, and in that the pumping means (14) is suitable to suck sedimented ground material (8) together with liquid in the borehole (2) and to remove a portion of the sucked liquid from the suction line (20) via a branch line (22) to the at least one flushing nozzle (34) on the rotor (30) for forming the flushing jet (35).
2. Cleaning device according to claim 1, characterised in that a plurality of flushing arms (32) are provided which extend radially relative to a middle axis.
3. Cleaning device according to one of claims 1 to 2, characterised in that at least one flushing nozzle (34) is arranged on at least one rolling body which is mounted to be rotatable about a rotation axis and is driven.
4. Cleaning device according to claim 3, characterised in that a rotation movement of the rotor (30) or the rolling body can be produced by a flushing jet (35).
5. Cleaning device according to one of claims 1 to 4, characterised in that a spacer ring (40) is provided which surrounds the rotor (30) or the rolling body according to one of claims 3 and 4.
6. Cleaning device according to one of claims 1 to 5, characterised in that the pumping means (14) is arranged in a housing (12) which can be lowered to the bottom (6) of the borehole (2).
7. Cleaning device according to one of claims 1 to 6, characterised in that the at least one flushing nozzle (34) and / or the at least one flushing arm (32) can be adjusted.
8. Method for creating a foundation element, in which a borehole (2) is incorporated in a ground, which borehole (2) is filled with a hardenable suspension which hardens to form the foundation element, wherein, before hardening of the foundation element, a cleaning device (10) is lowered to the bottom (6) of the borehole (2), through which sedimented ground material (8) in the region of the bottom (2) is sucked away and removed via a suction opening (16), wherein a cleaning device (10) with at least one flushing arm (32) with at least one flushing nozzle (34) is used, with which a flushing jet (35) is produced, through which sedimented ground material (8) is flushed from the bottom (6) of the borehole (2), wherein the at least one flushing arm (32) is mounted to be rotatable about a middle axis, characterised in that the at least one flushing arm (32) is arranged on a rotatable rotor (30), wherein a rotation movement of the rotor (30) is produced by a flushing jet (35) being directed in circumference direction due to a blow-back, and in that a pumping means (14) sucks sedimented ground material (8) together with liquid in the borehole (2) wherein a portion of the sucked liquid is removed from a suction line (20) via a branch line (22) to the at least one flushing nozzle (34) on the rotor (30) to form the flushing jet (35).
9. Method according to claim 8, characterised in that the at least one flushing nozzle (34) is moved over the bottom (6) of the borehole (2), in particular being driven in rotation.