METHOD AND DEVICE FOR PRODUCING A FOUNDATION ELEMENT IN THE GROUND FROM A SOIL MORTAR

Abstract

The invention relates to a method for producing a foundation element in the ground from a soil mortar, having a ground removal device with at least one rotationally driven processing tool, wherein the at least one processing tool is moved substantially vertically relative to the ground and ground material is removed by the at least one rotationally driven processing tool by forming a hole in the ground, a settable suspension is fed into the hole and the removed soil material remains at least partially in the hole and is mixed in situ by the at least one rotationally driven processing tool with the supplied suspension to form the soil mortar, wherein the soil mortar formed, after the at least one rotationally driven processing tool has been withdrawn from the hole, hardens to the foundation element in the ground, wherein at least the vertical movement of the at least one machining tool, the rotary movement of the at least one machining tool, the supply of suspension and at least one dimensioning of the foundation element represent method parameters. According to the invention it is provided that the method is carried out automatically with a control device at least in portions, wherein at least one method parameter is entered into the control device as a default value, and in that at least one remaining method parameter is set and controlled by the control device in dependence on the at least one default value entered.

Claims

1. A method for producing a foundation element in the ground from a soil mortar, having a ground removal device with at least one rotationally driven processing tool, wherein the at least one processing tool is moved substantially vertically relative to the ground and ground material is removed by the at least one rotationally driven processing tool by forming a hole in the ground, a settable suspension is fed into the hole and the removed soil material remains at least partially in the hole and is mixed in situ by the at least one rotationally driven processing tool with the supplied suspension to form the soil mortar, wherein the soil mortar formed, after the at least one rotationally driven processing tool has been withdrawn from the hole, hardens to the foundation element in the ground, wherein at least the vertical movement of the at least one machining tool, the rotary movement of the at least one machining tool, the supply of suspension and at least one dimensioning of the foundation element represent method parameters, wherein the method is carried out automatically with a control device at least in portions, wherein at least one method parameter is entered into the control device as a default value, and at least one remaining method parameter is set and controlled by the control device in dependence on the at least one default value entered.

2. The method according to claim 1, wherein the method parameters comprise or additionally have at least one of the following parameters: rotational speed of the machining tool, direction of rotation of the machining tool, torque of the machining tool, number of rotations per depth feed of the machining tool, vertical movement speed or vertical feed force when lowering or pulling the machining tool, feed rate of suspension, feed quantity of suspension, or a combination thereof.

3. The method according to claim 1, wherein the at least one rotationally driven machining tool comprises a drilling tool which is rotationally driven about a substantially vertically directed drilling axis, wherein the hole is produced by drilling.

4. The method according to claim 1, wherein the at least one rotationally driven machining tool comprises a milling wheel which is driven in rotation about a substantially horizontally oriented milling wheel axis, wherein the hole is produced by milling.

5. The method according to claim 1, wherein at least one rotationally driven processing tool has at least one removal element, by means of which soil material is removed and is comminuted, and/or has at least one mixing element through which the removed soil material is mixed with the fed suspension.

6. The method according to claim 1, wherein a feed of suspension into the hole and a movement of the at least one rotationally driven processing tool, in particular a rotation of the at least one rotationally driven processing tool, are entered into the control device as default values, and a substantially vertical movement of the at least one rotationally driven processing tool is set by the control device in dependence on the default values entered.

7. The method according to claim 1, wherein a vertical lowering of the at least one rotationally driven machining tool is set by the control device, if this is not a default value, and/or a vertical pulling of the at least one rotationally driven machining tool is set, if this is not a default value.

8. The method according to claim 1, wherein a rotation of the processing tool and/or a feed rate and/or a feed quantity of suspension is set by the control device, if these are not default values.

9. The method according to claim 1, wherein the control device controls the feed device, in particular a suspension pump, through which suspension is fed into the hole.

10. A device for creating a foundation element in the ground from a soil mortar, in particular according to claim 1, with a soil removal device with at least one rotationally driven processing tool, wherein the device is configured, to move the at least one processing tool substantially vertically relative to the ground and to remove ground material by means of the at least one rotationally driven processing tool by forming a hole in the ground, to feed a settable suspension into the hole by means of a feeding device, and to mix, in situ in the hole by the at least one rotationally driven processing tool, the supplied suspension with removed soil material to form the soil mortar, wherein the soil mortar formed, after the at least one rotationally driven processing tool has been withdrawn out of the hole, hardens to the foundation element in the ground, wherein at least the vertical movement of the at least one machining tool, the rotary movement of the at least one machining tool, the supply of suspension and at least one dimensioning of the foundation element represent method parameters, wherein a control device is provided and configured, with which the creation of the foundation element can be carried out automatically at least in portions, wherein at least one method parameter is entered into the control device as a default value, and a substantially vertical movement of the at least one rotationally driven machining tool is set by the control device depending on the default values entered.

11. The device according to claim 10, wherein the device is configured as a drilling device, in which the at least one rotationally driven machining tool comprises a drilling tool which is driven in rotation about a substantially vertically directed drilling axis.

12. The device according to claim 11, wherein the drilling device has a plurality of drilling tools which are arranged parallel next to each other.

13. The device according to claim 10, wherein the device is configured as a milling machine, in particular a diaphragm wall milling machine, in which the at least one rotationally driven machining tool has a milling wheel which is driven in rotation about a substantially horizontally directed milling wheel axis.

14. The device according to claim 13, wherein the milling machine has a plurality of milling wheels, in particular two pairs of milling wheels, which are arranged parallel next to each other.

15. The device according to claim 10, wherein a suspension pump is arranged for feeding suspension into the hole, wherein the suspension pump is controlled by the control device.

Description

[0036] The invention is explained further hereinafter with reference to preferred exemplary embodiments, which are shown schematically in the drawings. The drawings show:

[0037] FIG. 1 a perspective view of a first embodiment of a device according to the invention, which is configured as a milling device;

[0038] FIG. 2 an enlarged detailed view of the milling machine of the device of FIG. 1 in partially sectioned side view;

[0039] FIG. 3 a schematic representation of the production of a foundation element in the ground by using the milling machine shown in FIG. 2;

[0040] FIG. 4 a schematic side view of the device in FIG. 1 when creating a foundation element in the ground;

[0041] FIG. 5 a side view of a further device according to the invention, which is configured as a drilling device;

[0042] FIG. 6 an enlarged front view of the drilling tools which are used in the device shown in FIG. 5; and

[0043] FIG. 7 a schematic screen representation of a control device for the invention.

[0044] A device 30 according to the invention for creating a foundation element in the ground, which is specifically configured as a diaphragm wall milling machine 50, is shown in FIG. 1. The device 30 can preferably have a carrier 32 with an undercarriage 33, which can in particular be configured as a crawler chassis. Preferably, a superstructure 34 can be arranged on the undercarriage 30 and can preferably be mounted rotatably about a vertical axis of rotation. A substantially vertical mast 35 can be attached to the carrier 32, in particular the superstructure 34, during operation.

[0045] In the device 30, which is configured as a diaphragm wall milling machine 50, a milling machine 60 with a guide rod 52 is displaceably arranged along the mast 35 as a soil removal device 40. This machining device 40 can have milling wheels 64 as a machining tool 42 for removing soil material, as will be explained in greater detail hereinafter in conjunction with FIG. 2.

[0046] The milling machine 60 according to FIG. 2 has a compact frame 61, which is smaller in cross-sectional dimensions than the cross-section of the milling hole produced by the milling machine 60. Two plate-shaped end shields 62 are attached to the underside of the frame 61, one next to the other, and milling wheels 64 are mounted on each of their side surfaces.

[0047] The milling wheels 64 on an end shield 62 are each coaxial to one another, so that a pair of milling wheels is formed on each end shield 62. Along the outer circumference of each milling wheel 64, removal elements are configured in a fundamentally known manner for removing, in particular milling off, soil material. The milling wheels 64 are each driven in pairs via an associated drive 63, wherein the two drives 63 provided are preferably arranged in the housing-like frame 61 of the milling machine 60.

[0048] The frame 61 is attached to a guide rod 52, in which a suspension feed 54 runs to feed a settable suspension. The tubular suspension feed 54 opens out below the frame 61 between the two pairs of milling wheels 64. In a milling operation, the soil material removed by the milling wheels 64 can thus be mixed directly in the area of the milling wheels with the settable suspension flowing out of the suspension feed 54 by the movement of the milling wheels and a soil mortar can be formed in situ. The radially protruding removal elements 66 can here also serve directly as mixing elements for mixing the milling cuttings with the suspension. Preferably, additional paddle-like mixing elements can also be arranged on the milling wheels 64.

[0049] Mixing can also be supported by plate-like scrapers 68, which are attached to the underside of the frame 61 and can reach into the area of the row-like arranged removal elements 66 for scraping off adhering soil material. The rotary movement of the milling wheels 64 and the arrangement of the scrapers 68 can in particular assist in conveying the mixture of the milling cuttings and the suspension upwards past the frame 61 into a rear area of the milling slot.

[0050] The process and the method for forming a foundation element 8 in the ground 1 is further illustrated schematically in FIGS. 3 and 4. The milling machine 60 with the rotationally driven milling wheels 64 is lowered substantially vertically into the ground 1 via the guide rod 52, wherein a hole 3 is created in the ground 1 by the rotating milling wheels 64. The soil material removed during milling is mixed in situ in the hole 3 by the milling wheels 64 with the settable suspension supplied via the suspension feed 54 to a soil mortar 5, which flows past the frame 61 of the milling machine 60 and can thus fill out and support the hole 3 in the soil 1, as illustrated clearly in FIG. 3.

[0051] After reaching a final depth, further homogenisation of the soil mortar 5 in the hole 3 can be carried out if necessary by moving the milling machine 60 vertically up and down in the hole 3. After completion of the processing, the milling machine 60 is withdrawn from the hole 3, as shown in FIG. 4. The soil mortar 5 in the hole 3 can set up to the foundation element 8.

[0052] As also can be seen in FIG. 4, the milling machine 60 can be guided by the guide rod 52 along the mast 35 on the carrier 32 of the device 30.

[0053] A feed device 20, which may, in particular comprise a suspension pump 22, is used to convey a settable suspension, such as a cement suspension, from a reservoir (not shown) or a mixing and preparation plant to the upper end of the guide rod 52 into the tubular suspension feed 54 via a feed line 24, which is only partially shown in FIG. 4. A vertical travelling movement of the milling machine 60, a rotary movement of the milling wheels 64 and a conveying capacity of the feed device 20 can be coordinated and controlled as required via a control device (not shown).

[0054] In conjunction with FIGS. 5 and 6, a further embodiment of the device 50 according to the invention is explained, which is configured as a drilling device 70. The drilling device 70 can also preferably have a carrier device 32 with an undercarriage 30, which can in particular be configured as a crawler-type undercarriage. A superstructure 34 can preferably be arranged on the undercarriage 30 and can preferably be mounted rotatably about a vertical axis of rotation. A substantially vertical mast 35 can be attached to the carrier 32, in particular the superstructure 34, during operation.

[0055] A drilling carriage 72 can be mounted and guided in a linearly displaceable manner along the mast 35. A soil removal device 40 can be arranged on the drilling carriage 72, and in the illustrated embodiment example is configured for example as a drilling device 80 with three drilling tools 82 arranged next to each other. The drilling tools 82 can each have a rod-shaped design with a lower drilling head for removing soil material and an adjoining conveying and mixing auger. Other embodiments of the at least one drilling tool 82 are possible, for example with separate conveying and mixing segments.

[0056] The preferably three drilling tools 82 arranged next to each other can be used to create an elongate borehole 3 in the ground 1.

[0057] The soil material removed by the respective drill heads is conveyed upwards by the augers into a rear area of the hole 3. The drilling tools 82 can be configured with a hollow core barrel, through which settable suspension can flow down to a lower area of the drilling tools 82 and flow out into the hole 3 via outlet openings (not shown). The suspension is fed via a hose-like feed line 24 from the carrier 32 to the upper end of the drilling tools 82 in the area of the drill drives 83. Further outlet openings for the suspension can also be designed along the rod-shaped drilling tools 82 for discharge in the area of the feed screws.

[0058] The removed soil material, which is at least partially conveyed upwards by the drilling tools 82, can thus be mixed with the supplied settable suspension to the soil mortar 5 by the rotary movement of the drilling tools 82 and, in particular, the augers. The soil mortar 5 produced in situ in this way can harden in the produced drilled hole to a desired foundation element 8.

[0059] According to FIG. 7, a possible representation 90 on a screen or a possible protocol graph is shown as an example. This can be displayed to a device operator on a screen of the machine and/or printed out by the control device of the device 50 when carrying out the method according to the invention. In a left-hand first portion 91 of the representation 90, a depth progression of the machining tool 42 over time can be shown. Specifically, it can be seen from the representation 90 according to FIG. 7 that the processing tool 42 is sunk largely uniformly from the surface to a depth of approximately 12 metres within approximately 50 minutes and is then withdrawn again from the final depth to the surface in the subsequent approximately 20 minutes.

[0060] In the subsequent second portion 92, the respective depth can be used to display the amount of suspension that has been introduced and worked into hole 3 in which depth portion. The amount of suspension incorporated in each case is shown as bar 95 in depth portions of 0.5 metres each, wherein the second portion 92 refers to the introduction of suspension during the sinking of the processing tool.

[0061] On the other hand, in the subsequent third portion 93, the amount of suspension incorporated in each depth portion, which is also 0.5 metres in each case, can be displayed as bar 95 when the machining tool is pulled.

[0062] Furthermore, the total quantity of suspension incorporated over each depth portion during sinking and during pulling of the processing tool 42 can be shown in the subsequent right-hand fourth portion 94. It should be noted that in FIG. 7 the quantity scale with respect to the X-axis is different in portions 92, 93 and 94, while the depth portions with respect to the Y-axis may be the same in portions 91, 92, 93 and 94.

[0063] The control system can be used to seek that the same amount of suspension in each depth portion or a predetermined amount of suspension, which differs for each depth portion, is introduced after sinking and pulling. With the help of the evaluation software, comparable graphs can also be generated for the executed tool rotations per metre of ground depth. During execution, the machine operator is shown comparable diagrams for the suspension quantity and, depending on the process, additionally also tool rotations on the work screen in the machine.