Groove wall milling machine and method for creating milling grooves in soil

Abstract

The invention relates to a slot wall milling machine, comprising: a box-shaped housing, on the upper side of which a lifting device can be mounted; at least one milling wheel arranged at the lower side of the housing and rotatably driven to remove soil material, in which the milling teeth are arranged along the outer periphery of the milling wheel in at least one peripheral row at which at least one axial peripheral gap adjoins; and at least one cleaning plate fixedly arranged relative to the housing and engaged into the at least one peripheral gap at the milling wheel to clean the soil material. According to the invention, it is provided that the at least one cleaning plate is mounted on the plate support at a distance from the housing, a through-hole being formed between the at least one plate support and the housing, through which through-hole soil material milled off during operation can be guided upwards.

Description

Technical Field

[0001] The invention relates to a slot wall milling machine according to the preamble of claim 1, comprising: a box-shaped housing, on the upper side of which a lifting device can be mounted; at least one milling wheel, which is arranged on the lower side of the housing and can be driven in rotation to remove soil material, wherein the milling teeth are arranged along the outer periphery of the milling wheel in at least one peripheral row, adjacent to which is at least one axial gap; and at least one cleaning plate, which is fixedly arranged relative to the housing and engages in at least one peripheral gap at the milling wheel to clean soil material.

[0002] The invention also relates to a method for creating a milling groove in soil according to the preamble of claim 14 Background Art

[0003] A slot wall milling machine of this type is known, for example, from EP 1452645 A1. Several rows of milling teeth are arranged along the circumference of the milling wheels arranged in pairs. An axial gap is left between the rows of milling teeth, into which a so-called cleaning plate engages. The cleaning plate is arranged at the underside of the box-shaped housing and serves to strip off sticky soil material adhering to the milling teeth, which could impair the milling performance, and thus free the milling teeth from the sticky soil material.

[0004] In the aforementioned trench wall milling machine, the milled soil material remains in the soil and can be processed on site with the supplied binderable suspension to form a so-called soil mortar. After curing, the soil mortar can form a trench wall section in the created milled trench. From such a trench wall section, a sealing wall or surrounding wall can be created, for example for pit enclosure.

[0005] In order to create soil mortar on site from the milled soil material, in this type of slot wall milling machine, the box-shaped housing with the drive unit is designed to be smaller in its outer peripheral dimensions than the milling slot formed. As a result, a gap is created at the housing, through which the milled soil material (which is mixed with the supplied solidifying suspension to form soil mortar by the milling wheel) can flow through the housing into the upper region of the milling slot.

[0006] When the groove wall milling machine is in operation, the milling wheels are driven in particular in opposite directions, so that the two milling wheel pairs each rotate inwards and thus convey the soil material into the central area below the housing of the milling machine. In this area, a bondable suspension can also be supplied in order to achieve a good mixing effect to form a soil slurry.

[0007] In such an inwardly rotating drive of the milling wheel, in certain soil types, in particular soil layers with rock material, the further transport of the milled material through the housing can be impeded by the cleaning plates that engage in a comb-like manner between the milling teeth, for example when there is coarse, hard rock material. In certain cases, this can lead to an undesirable excessive increase in the rotational resistance at the milling wheel and thus to an increased power requirement. As a result, damage to the cleaning plates and milling teeth can also occur. Summary of the invention

[0008] The invention is based on the object of specifying a slot wall milling machine and a method for producing a milled slot, with which particularly efficient operation is achieved when producing the milled slot.

[0009] This object is achieved on the one hand by a slot wall milling machine having the features of claim 1 and on the other hand by a method having the features of claim 14. Preferred embodiments of the invention are specified in the dependent claims.

[0010] The slot wall milling machine according to the invention is characterized in that at least one cleaning plate is arranged at a distance from the housing on the plate holder, wherein a through-hole is formed between the at least one cleaning plate and the housing, through which soil material milled off during operation can be guided upwards.

[0011] The basic idea of ​​the present invention is that the cleaning plate is not directly arranged at the lower side of the box-shaped housing, but is arranged at the plate support spaced apart from the box-shaped housing. The plate support is arranged and constructed in this way so that at least one cleaning plate is arranged at a certain distance from the housing, and a through-portion for the soil material to be milled is formed by this distance. Through this through-portion, the soil material to be milled can be guided through the cleaning plate with the supplied suspension liquid when necessary in the inward rotation drive of the milling wheel, and thus flow upward in a simplified manner. Therefore, hard rock materials must not be forced by the meshing arrangement between the milling teeth and the cleaning plate. In addition, the actual cleaning effect of the cleaning plate is further retained in the adhered soil material. The through-portion can have a size of several centimeters to about 40% of the diameter of the milling wheel in the horizontal longitudinal direction, and has a size of the wheel width of the milling wheel in the horizontal width direction.

[0012] A preferred embodiment of the invention is that at least two peripheral rows of milling teeth are arranged at at least one milling wheel, the milling teeth being axially spaced apart from each other by a peripheral gap, in which a cleaning plate is engaged. In particular, more than two peripheral rows, in particular four or five peripheral rows, each having a corresponding axial distance to an adjacent tooth row can also be arranged at the milling wheel. In accordance with the existing gap, which has an axial width of typically 2 to 10 cm, a cleaning plate fixed relative to the housing engages in the peripheral gap at the milling tooth driven in a rotating manner by the milling wheel. The cleaning plate can easily contact the milling teeth and tooth holders passing by, i.e., be scored thereon, or be spaced therefrom by a small axial distance of about a few millimeters.

[0013] According to another embodiment of the invention, it is preferred that at least one milling wheel is supported on a plate-shaped support cap at the lower side of the housing, and at least one cleaning plate is mounted on the support cap by means of a plate holder. In particular, a drive device for driving the milling wheel can be provided in the support cap. The plate holder can be a simple support arm, on which the cleaning plate is mounted. The support arm can be arranged transversely to the center plane of the support cap. In principle, however, an L-shaped or T-shaped plate holder can also be mounted on the side edge of the support cap or on the housing.

[0014] Furthermore, it is particularly preferred that the two pairs of milling wheels are arranged on the underside of the housing. Each milling wheel of the milling wheel pair is arranged on a common central bearing cap on the respective side. The plate holder is arranged on the respective outer side so that the cleaning plate can engage obliquely from the outside to the inside in the peripheral gap between the milling teeth.

[0015] It is particularly expedient here that one milling wheel from each pair of milling wheels is supported on one side of the support cap and that at least one cleaning plate is associated with each milling wheel and is mounted on the support cap via a plate holder. Preferably, a plurality of cleaning plates for each milling wheel can also be arranged on each plate holder, corresponding to the number of gaps or interspaces between the peripheral rows of milling teeth.

[0016] According to another embodiment of the invention, each milling wheel is advantageously associated with a through-hole which is bounded by the housing, the bearing cap and the associated at least one cleaning plate and the plate holder. In this arrangement, in particular, harder rock material can be prevented from forcing its way between the milling teeth with the tooth holder and the cleaning plate, i.e. the corresponding rock material can be guided upwards through the through-hole.

[0017] According to a further development of the slot milling machine according to the invention, a supply device is provided for supplying a liquid, in particular a curable suspension, such as a cement suspension. The suspension can be conveyed from the ground to the slot milling machine in the milling slot at a corresponding pumping device.

[0018] According to a development of the invention, it is particularly expedient that the supply device is arranged between the two pairs of milling wheels and / or in at least one of the plate supports. The supply device can be arranged in a manner known in principle in the central region of the underside of the box-shaped housing between the two pairs of milling wheels. Alternatively or in addition, the supply device can also be arranged at at least one plate support. The plate support is at least partially hollow in this case with a supply channel. The supply channel ends at one or more outlet nozzles for the outflow of liquid in the area of ​​the cleaning plate. This improves the mixing effect and also causes an additional free flow of viscous material at the milling teeth.

[0019] In principle, the cleaning plate according to the invention can be used at different types of slot milling machines via the arrangement of the plate holder. According to one embodiment of the invention, it is particularly advantageous if the outer periphery of the housing is smaller than the milling cross section of the milling wheel. As a result, one or more regions are formed along the housing, which form a through region or through channel between the housing and the surrounding soil wall. As a result, the soil material to be milled and the soil mortar produced, in particular by supplying a bondable liquid, can flow upward from the region of the milling wheel through the housing of the milling frame into the section of the created milling slot above the housing of the slot milling machine.

[0020] In principle, the slot milling machine according to the invention can be driven in any suitable manner. According to a preferred embodiment of the invention, a drive device, in particular a hydraulic motor or an electric motor, for driving the milling wheel is arranged in the housing. Thus, one or more central drive motors can be arranged in the housing. The torque transmission can take place in a manner known in principle via a downwardly extending drive shaft in the bearing cap and a corresponding transmission in the bearing cap or at the milling wheel.

[0021] According to another embodiment of the invention, it can be advantageous if at least one milling wheel has a hub in which a hub motor is arranged. The hub motor can also be a hydraulic motor or preferably an electric motor. In such an arrangement, the box-shaped housing can be used to accommodate other components or can be designed to be correspondingly smaller. In principle, a frame-like design of the housing is also possible.

[0022] Another preferred embodiment of the invention is that at least one cleaning plate and / or the plate holder is releasably fastened and a connecting device is provided at the lower side of the housing, with which at least one cleaning plate can be fastened directly to the housing. In this way, a particularly flexible arrangement of the cleaning plates can be achieved, depending on the desired milling method with different drive directions of the milling wheel. In particular, the cleaning plate located outside and arranged at the plate holder can be partially or completely removed when necessary. Alternatively or in addition, the cleaning plate can be directly arranged at the lower side of the housing in a manner known in principle. In particular, a screw connection or other easily releasable connection method is possible as a connecting device.

[0023] The invention also includes a slot milling device having a carrier device, on which the slot milling machine according to the invention is arranged vertically movable by means of a lifting device. The carrier device can be designed in particular to be movable with a substructure, in particular a crawler-type running gear, and a superstructure rotatably supported thereon. A mast or a boom can be arranged on the superstructure. A rope suspension or a rigid guide rod can be used as a lifting device, which is guideable along the mast.

[0024] The method for producing a milled groove in soil according to the present invention is characterized in that a groove wall milling machine according to the present invention or a groove wall milling device according to the present invention is used. Here, the groove wall milling machine described above or the groove wall milling device described above can be used. Here, the advantages described above can be achieved when carrying out the method.

[0025] According to the invention, a preferred method variant is that at least one milling wheel is driven in rotation in a rotary device, wherein the soil material milled off is guided from at least one cleaning plate through a passage between the housing and the cleaning plate. In particular, when milling soil layers with harder rock inclusions, this can avoid an increase in the rotational resistance during milling and the occurrence of damage, which could occur due to the forced passage of harder rock material between the cleaning plate and the milling teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below based on the preferred embodiments schematically shown in the accompanying drawings. In the accompanying drawings:

[0027] Figure 1 A perspective view of a slot wall milling device according to the present invention is shown;

[0028] Figure 2 shows a perspective, enlarged and schematic illustration of a slot wall milling machine according to the invention;

[0029] Figure 3 Shows that according to Figure 2 Front view of the slot wall milling machine;

[0030] Figure 4 Shows that according to Figure 2 and Figure 3 A side view of a slot wall milling machine; and

[0031] Figure 5 A schematic diagram of the material flow during milling using the slot milling machine according to the invention is shown. DETAILED DESCRIPTION

[0032] exist Figure 1 1 shows a slot milling device 10 according to the invention, which has a carrier device 12. The carrier device 12 can have a substructure 14 designed as a crawler, on which a superstructure 16 can be rotatably supported. A substantially vertical mast 18 can be adjustably supported on the superstructure 18 via an articulation mechanism 17 with an adjustment cylinder. A guide rod 22 can extend along the mast 18 as part of a lifting device 20. A slot milling machine 30 according to the invention is arranged at the lower end of the guide rod 22, which is described in more detail below. The guide rod 22 can be moved vertically along the mast 18 as part of the lifting device 20 via a slide 24 that can be moved and can be connected to the guide rod 22 via a tensioning cylinder.

[0033] exist Figure 1 The slot wall milling machine 30 shown in FIG. 4 has two pairs of milling wheels 40 which are arranged parallel and side by side with a horizontally arranged rotation axis. Milling teeth 44 are arranged on the outer circumference of the milling wheels 40 in a manner known in principle.

[0034] Exemplary combination Figures 2 to 4 The structure of a possible slot milling machine 30 according to the invention is explained in more detail. The slot milling machine 30 is shown very schematically, wherein for the sake of clarity, the milling teeth are not shown in particular detail, but rather an annular track 45 or a peripheral row is shown, along which the milling teeth of the peripheral row move at the periphery of the milling wheel 40 in the case of a rotary drive. The milling teeth can be arranged on a plate-shaped milling tooth carrier, which is also not shown, and thus connected to a cylindrical hub 42 of the milling wheel 40. A hub motor can be arranged in the interior of the hub 42 for the rotary drive of the milling wheel 40.

[0035] The tracks 45 or the peripheral rows of milling teeth at each milling wheel 40 are spaced apart from one another in the axial direction, with peripheral gaps 46 remaining between them. In the illustrated embodiment, three circumferential tracks 45 or peripheral rows are provided at each milling wheel 40, which have two peripheral gaps 46 located between them. In each of these peripheral gaps 46, a cleaning plate 50 can be engaged, which can reach the outer circumference of the central hub 42. The cleaning plate 50 is here arranged on its radial outer side outside the tracks 45 of the milling teeth on a plate holder 60 and is fixed relative to the rotary milling wheel 40. A plate holder 60 can be provided for each milling wheel 40.

[0036] Each pair of milling wheels 40 can be supported at a plate-shaped support cap 34 located between the milling wheels 40, which is respectively arranged at the lower side of the box-shaped housing 32. A corresponding plate holder 60 for a cleaning plate 50 can also be arranged at the support cap 34 for each pair of milling wheels 40. In the embodiment shown, the plate holder 60 has a retaining shank 62 flanged at the support cap 34. A retaining block 64 can be fastened to the retaining shank 62, to which a cleaning plate 50 for each milling wheel 50 can preferably be releasably fastened via a screw connection.

[0037] According to the invention, the plate holder 60, which preferably extends substantially parallel to the axis of rotation of the milling wheel 40, is arranged at a distance from the box-shaped housing 32 of the slot milling machine 30 such that a gap or a through-hole 70 is formed between the respective plate holder 60 and the housing 32, such as, for example, from Figure 3 As can be learned from.

[0038] A first supply device 56 for supplying a bondable suspension into the region between the milling wheels 40 can be provided on the underside of the housing 32 centrally between the two plate-shaped support caps 34. Alternatively or additionally, one or more supply devices can be provided in the tubular retaining rod 62.

[0039] The milling wheels 40 can be driven in rotation via a drive device (not shown in greater detail), which in the illustrated embodiment can in particular be a hub motor in the hub 42 of the milling wheel 40 , in such a way that they each rotate inwards. Figure 5 The direction of rotation is indicated in the diagram using an arrow.

[0040] In accordance with Figure 5In the case of such a drive of the milling wheels 40, soil material removed during the milling operation can be mixed into a soil mortar by the supplied binder suspension in the central region between the milling wheels 40. The removed soil material and the produced soil mortar can flow upwards through the correspondingly formed openings 70, such as by the arrangement of the cleaning plate 50 on the plate holder 60 spaced apart from the housing 32. Figure 5 The box-shaped housing 32 is designed in this case to be smaller in its peripheral dimensions than the milling cross section produced by the milling wheel 40 .

[0041] The outer edges of the cleaning plate 50 can be designed to be inclined inwards accordingly, so as to support the upward flow of the milled soil material and suspension through the opening 70 between the plate holder 60 and the housing 32. As a result, in particular when milling rocky or stone-containing soil layers, larger stones can also be efficiently transported away from the area of ​​the milling wheel 40 upwards through the housing 32, thereby reducing the risk of damage to the cleaning plate 50 and the milling teeth.

Claims

1. A slot wall milling machine having - a box-shaped housing (32), on the upper side of which the lifting device (20) can be arranged, at least one milling wheel (40) which is arranged on the underside of the housing (32) and which can be driven rotatably for removing soil material, wherein The milling teeth (44) are arranged along the outer periphery of the milling wheel (40) in at least one peripheral row, adjoining at least one axial peripheral gap (46), and at least one cleaning plate (50) which is arranged fixedly relative to the housing (32) and engages in at least one peripheral gap (46) at the milling wheel (40) to clean soil material, It is characterized in that - the at least one cleaning plate (50) is arranged on a plate holder (60) at a distance from the shell (32), and the plate holder is arranged at a distance from the shell (32), wherein a through-portion (70) is formed between the at least one cleaning plate (50) arranged on the plate holder (60) and the shell (32), through which soil material milled off during operation can be guided upward.

2. The slot wall milling machine according to claim 1, It is characterized in that At least two peripheral rows of milling teeth (44) are arranged on the at least one milling wheel (40), the milling teeth being axially spaced apart from one another by peripheral gaps (46) in which cleaning plates (50) engage.

3. The slot wall milling machine according to claim 1 or 2, It is characterized in that The at least one milling wheel (40) is supported on a plate-shaped support cap (34) on the underside of the housing (32), and The at least one cleaning plate (50) is mounted on the support cap (34) by means of the plate holder (60).

4. The slot wall milling machine according to any one of claims 1 to 3, It is characterized in that Two pairs of milling wheels (40) are arranged at the underside of the housing (32).

5. The slot wall milling machine according to claim 4, It is characterized in that One milling wheel (40) from each pair of milling wheels (40) is supported at one side of the support cover (34), and At least one cleaning plate (50) is associated with each milling wheel (40), which is mounted on the support cap (34) via a plate holder (60).

6. The slot wall milling machine according to claim 5, It is characterized in that Each milling wheel (40) is associated with a through-portion (70) which is bounded by the housing (32), the bearing cap (34) and the associated at least one cleaning plate (50) and the plate holder (60).

7. A slot wall milling machine according to any one of claims 1 to 6, It is characterized in that A supply device (56) is provided for supplying a liquid, in particular a curable suspension.

8. The slot wall milling machine according to claim 7, It is characterized in that The supply device (56) is arranged between the two pairs of milling wheels (40) and / or in at least one of the plate supports (60).

9. A slot wall milling machine according to any one of claims 1 to 8, It is characterized in that The outer periphery of the housing (32) is smaller than the milling cross section of the milling wheel (40).

10. The slot wall milling machine according to any one of claims 1 to 9, It is characterized in that A drive device, in particular a hydraulic motor or an electric motor, is arranged in the housing (32) for driving the milling wheel (40).

11. A slot wall milling machine according to any one of claims 1 to 9, It is characterized in that The at least one milling wheel (40) has a hub (42) in which a hub motor is arranged.

12. A slot wall milling machine according to any one of claims 1 to 11, It is characterized in that The at least one cleaning plate (50) and / or the plate holder (60) are releasably fastened and a connection device for the at least one cleaning plate (50) is provided on the underside of the housing (32).

13. A slot wall milling device having a carrier device (12), on which a slot wall milling machine (30) is arranged vertically movable by means of a lifting device (20), It is characterized in that A slot wall milling machine (30) according to any one of claims 1 to 12 is provided.

14. A method for creating a milling groove in soil, It is characterized in that Use of a slot wall milling machine (30) according to any one of claims 1 to 12 or a slot wall milling device (10) according to claim 13.

15. The method according to claim 14, It is characterized in that The at least one milling wheel (40) is driven in a rotational direction, wherein the milled soil material is guided from the at least one cleaning plate (50) through a passage (70) between the housing (32) and the cleaning plate (50).

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