EP4239130A1 - Slurry wall cutter and method for creating a cut in the ground - Google Patents

Abstract

The invention relates to a trench wall cutter with a box-shaped housing, on the top of which a lifting device can be attached, at least one cutting wheel, which is arranged on an underside of the housing and can be driven in rotation to remove soil material, with cutting teeth of at least one circumferential row being arranged along the outer circumference of the cutting wheel , which is bordered by at least one axial free space, and at least one clearing plate, which is arranged relatively fixed to the housing and engages in the at least one circumferential free space on the cutting wheel for clearing soil material. According to the invention, the at least one clearing plate is attached to a plate holder at a distance from the housing, with a passage being formed between the at least one clearing plate and the housing, through which ground material milled off during operation can be guided upwards.

Description

The invention relates to a trench wall cutter with a box-shaped housing, on the top of which a lifting device can be attached, at least one cutting wheel, which is arranged on an underside of the housing and can be driven in rotation to remove soil material, with cutting teeth being arranged in at least one circumferential row along the outer circumference of the cutting wheel which is adjoined by at least one axial free space, and at least one clearing plate which is arranged so as to be relatively fixed to the housing and engages in the at least one circumferential free space on the cutting wheel for clearing soil material, according to the preamble of claim 1.

The invention further relates to a method for creating a milled slot in the ground according to the preamble of claim 14.

A generic trench cutter is, for example, from EP 1452645 A1 out. Rows of cutting teeth are arranged along the circumference of the paired cutting wheels. Axial free spaces remain between the rows of milling teeth, into which so-called clearing plates engage. The clearing plates are arranged on the underside of the box-shaped housing and are used to strip off cohesive soil material adhering to the cutting teeth, which can impair the cutting performance, and thus to keep the cutting teeth free of cohesive soil material.

In the case of the trench wall cutter mentioned, the milled-off soil material remains in the soil and can be processed in situ with a supplied, settable suspension to form a so-called soil mortar. After hardening, the soil mortar can form a diaphragm wall segment in the prepared trench. From such Diaphragm wall segments can be used to create a sealing wall or an enclosing wall, for example to enclose an excavation pit.

In order to create a soil mortar in situ with the milled soil material, the box-shaped housing with the drive unit is designed smaller in its outer peripheral dimensions than the milled trench formed in the generic trench cutter. This creates a free space on the housing through which the milled soil material, which is mixed by the milling wheels with the supplied hardening suspension to form the soil mortar, has the opportunity to flow past the housing into an upper region of the milling trench.

When the trench wall cutter is in operation, the cutter wheels are driven in particular in opposite directions, so that the two pairs of cutter wheels each rotate inwards and thus convey soil material into a central region below the cutter housing. The settable suspension can also be supplied in this area in order to bring about a good mixing effect for forming the floor mortar.

With such inwardly rotating driving of the cutting wheels, in certain types of soil, in particular soil layers with rock material, further conveyance of the cuttings past the housing can be prevented by the clearing plates engaging between the cutting teeth in a comb-like manner, for example when coarser, hard rock material is present. In certain cases, this can lead to an undesired excessive increase in the resistance to rotation of the cutting wheels and thus to an increased power requirement. This can also cause damage to the clearing plates and the cutting teeth.

The invention is based on the object of specifying a trench wall cutter and a method for creating a cut trench, with which a particularly efficient operation when creating a cut trench is made possible.

The object is achieved on the one hand by a trench cutter 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 given in the dependent claims.

The trench wall cutter according to the invention is characterized in that the at least one clearing plate is attached to a plate holder at a distance from the housing, with a passage being formed between the at least one clearing plate and the housing, through which the ground material milled off during operation can be guided upwards.

A basic idea of the invention is not to arrange the clearing plates directly on the underside of the box-shaped housing, but at a distance from the box-shaped housing on plate holders. The plate holders are arranged and designed in such a way that the at least one clearing plate is arranged at a distance from the housing, through which a passage for the milled soil material is formed. Through this passage, in particular when the cutting wheels are driven rotating in an inward direction, ground material that has been milled off can be guided past the clearing plates, optionally with suspension supplied, and thus flow upwards in a simplified manner. The hard rock material does not have to be forced through the meshing arrangement between the cutting teeth and the clearing plates. In addition, the actual clearing effect of the clearing plates is retained when soil material sticks to it. The passage can have a size of a few centimeters up to approx. 40% of a cutting wheel diameter in the horizontal longitudinal direction and a size of up to the wheel width of a cutting wheel in the horizontal width direction.

A preferred embodiment of the invention consists in that at least two circumferential rows of cutting teeth are arranged on the at least one cutting wheel, which are spaced apart axially from one another by a circumferential free space, in which a clearing plate engages. In particular, more than two circumferential rows, in particular four or five circumferential rows, each with a corresponding axial spacing from the adjacent row of teeth, can also be arranged on the cutting wheel. Corresponding to the existing free spaces, which generally have an axial width of 2 to 10 cm, the clearing plates fixed relative to the housing are inserted into the circumferential free spaces in rotation with the cutting wheel driven cutting teeth. The broaching plates can lightly contact, ie scratch, the passing milling teeth and tooth holders, or they can be spaced a small axial distance away, for example a few millimeters.

According to a further embodiment of the invention, it is preferred that the at least one cutting wheel is mounted on a plate-shaped bearing plate on the underside of the housing and that the at least one clearing plate is attached to the bearing plate with the plate holder. In particular, a drive device for driving the cutting wheels can be provided in the bearing plate. The plate holder can be a simple support arm on which the clearing plates are attached. The support arm can be arranged transversely to the center plane of the bearing plate. In principle, however, an L-shaped or T-shaped plate holder can also be attached to a side edge of the end shield or to the housing.

It is also particularly preferred that two pairs of cutting wheels are arranged on an underside of the housing. Each cutting wheel of a pair of cutting wheels is arranged on a common, central bearing plate on either side. The plate holders are arranged on the respective outer side, so that the clearing plates can engage in the circumferential free spaces between the cutting teeth, directed obliquely from the outside inwards.

Furthermore, it is particularly expedient that one of each pair of cutting wheels is mounted on one side of the bearing plate and that each cutting wheel is assigned at least one clearing plate, which is attached to the bearing plate via a plate holder. Preferably, a plurality of clearing plates for each cutting wheel can also be provided on each plate holder, corresponding to the number of free spaces or gaps between the peripheral rows of the cutting teeth.

According to a further embodiment of the invention, it is advantageous that each cutting wheel is assigned a passage which is delimited by the housing, the bearing plate and the assigned at least one clearing plate with the plate holder. With this arrangement, it is made possible, in particular, for harder rock material to avoid being forced through between the cutting teeth with the tooth holders and the clearing plates, in that the corresponding rock material can be discharged upwards through the passage.

According to a further development of the trench wall cutter according to the invention, it is provided that a supply device for supplying a liquid, in particular a hardenable suspension, such as a cement suspension. The suspension can be pumped from above ground to the trench wall cutter in the cut trench using a suitable pumping device.

According to a development of the invention, it is particularly expedient for the feed device to be arranged between two pairs of milling wheels and/or in at least one of the plate holders. The feed device can be arranged in a basically known manner between the two pairs of milling wheels in a central area on the underside of the box-shaped housing. Alternatively or additionally, the feed device can also be arranged on the at least one plate holder. The plate holder is at least partially hollow with a feed channel. The feed channel ends in one or more outlet nozzles for the liquid to flow out in the area of the clearing plates. As a result, a mixing effect can be improved and at the same time an additional free flow of cohesive material can be brought about at the cutting teeth.

In principle, the arrangement of the clearing plates according to the invention can be used on different types of trench cutters via plate holders. According to one embodiment of the invention, it is particularly advantageous that an outer circumference of the housing is smaller than a milling cross section of the milling wheels. This forms one or more areas along the housing which form a passage area or passage between the housing and the surrounding bottom wall. This allows milled soil material and in particular soil mortar produced by supplying a settable liquid to flow from the area of the milling wheels past the housing of the milling frame upwards into a section of the milled trench above the housing of the trench wall cutter.

In principle, the trench cutter according to the invention can be driven in any suitable manner. According to a preferred embodiment of the invention, it is provided that a drive device, in particular a hydraulic motor or an electric motor, for driving the cutting wheels is arranged in the housing. One or more central drive motors can be provided in the housing. A torque transmission can in principle known This can be done via a drive shaft running downwards in the end shield and a corresponding gear in the end shield or on the cutting wheels.

According to a further embodiment variant of the invention, it can be advantageous for the at least one cutting wheel to have a hub in which a hub motor is arranged. The hub motor can also be a hydraulic motor or preferably an electric motor. With such an arrangement, the box-shaped housing can be used to house other components, or it can be reduced in size accordingly. A fundamentally frame-like construction of the housing is also possible.

A further preferred embodiment of the invention consists in the at least one clearing plate and/or the plate holder being detachably fastened and a connecting device being provided on the underside of the housing with which at least one clearing plate can be fastened directly to the housing. Depending on a desired type of milling with a different driving direction of the milling wheels, a particularly flexible arrangement of the clearing plates can be achieved. In particular, the clearing plates arranged on the outside of the plate holder can be partially or completely removed if required. Alternatively or in addition, clearing plates can be attached directly to the underside of the housing in a basically known manner. In particular, screw connections or other easily detachable types of connection are possible as the connection device.

The invention also includes a trench wall milling device with a carrier device on which the trench wall milling cutter according to the invention is arranged so that it can move vertically with a lifting device. The carrier device can in particular be designed to be mobile with an undercarriage, in particular a crawler chassis, and an upper carriage rotatably mounted thereon. A mast or a cantilever arm can be provided on the superstructure. A cable suspension or a rigid guide rod, which is adjustably guided along the mast, can be used as a lifting device.

The method according to the invention for creating a milled trench in the ground is characterized in that a trench wall cutter according to the invention or a trench wall milling device according to the invention is used. There can be one previously described trench wall cutter or a previously described trench wall milling device are used. In this way, the advantages described above can be achieved when carrying out the method.

A preferred variant of the method according to the invention is that the at least one cutting wheel is driven in rotation in a rotary device, in which ground material that has been milled off is guided by the at least one clearing plate through the passage between the housing and the clearing plate. In particular when milling soil layers with harder rock inclusions, an increase in the rotational resistance and the occurrence of damage can be avoided during milling, which can result from forcing through of harder rock material between the clearing plates and the milling teeth.

Fig. 1

eine perspektivische Ansicht einer erfindungsgemäßen Schlitzwand-fräsvorrichtung;

Fig. 2

eine perspektivische vergrößerte und schematisierte Darstellung einer erfindungsgemäßen Schlitzwandfräse;

Fig. 3

eine Vorderansicht zu der Schlitzwandfräse nach Fig. 2;

Fig. 4

eine Seitenansicht zu der Schlitzwandfräse nach den Figuren 2 und 3; und

Fig. 5

eine schematische Darstellung zum Materialfluss beim Fräsen mit einer erfindungsgemäßen Schlitzwandfräse.

The invention is described in more detail below with reference to preferred exemplary embodiments, which are shown schematically in the drawings. In the drawings show:

1

a perspective view of a trench wall milling device according to the invention;

2

a perspective enlarged and schematic representation of a trench cutter according to the invention;

3

a front view of the trench cutter 2 ;

4

a side view of the trench wall cutter according to the figures 2 and 3 ; and

figure 5

a schematic representation of the material flow during milling with a trench cutter according to the invention.

A trench wall milling device 10 according to the invention with a carrier device 12 is in figure 1 shown. The carrier device 12 can have an undercarriage 14 designed as a crawler chassis, on which an upper carriage 16 can be rotatably mounted. A substantially vertical mast 18 can be adjustably mounted on the superstructure 18 via a linkage mechanism 17 with actuating cylinders. A guide rod 22 can extend along the mast 18 as part of a lifting device 20 extend. A trench wall cutter 30 according to the invention is attached to the lower end of the guide rod 22 and 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 movable carriages 24 that can be connected to the guide rod 22 via clamping cylinders.

In the figure 1 The trench wall cutter 30 shown has two pairs of cutting wheels 40 which are arranged parallel to one another with horizontally arranged axes of rotation. On the outer circumference of the cutting wheels 40 indicated cutting teeth 44 are attached in a basically known manner.

The construction of a possible trench wall cutter 30 according to the invention is exemplified in connection with Figures 2 to 4 explained in more detail. The trench wall cutter 30 is shown in a highly schematic manner, with cutting teeth in particular not being shown in detail for reasons of clarity, but ring-shaped paths 45 or circumferential rows along which the cutting teeth of a circumferential row on the circumference of a cutting wheel 40 move when the drive rotates. The cutting teeth can be arranged on plate-shaped cutting tooth holders, also not shown, and can thus be connected to a cylindrical hub 42 of the cutting wheel 40 . A hub motor for rotating the cutting wheel 40 can be arranged inside the hub 42 .

The tracks 45 or circumferential rows of cutting teeth on each cutting wheel 40 are axially spaced from one another leaving a circumferential clearance 46 therebetween. In the exemplary embodiment shown, three orbits 45 or circumferential rows are provided on each cutting wheel 40 with two circumferential clearances 46 in between. A clearing plate 50 can engage in each of these circumferential free spaces 46 and can reach close to the outer circumference of the central hub 42 . The clearing plates 50 are attached to a plate holder 60 on their outside radially outside of the tracks 45 of the cutting teeth and are stationary relative to the rotating cutting wheel 40 . A plate holder 60 can be provided for each cutting wheel 40 .

Each pair of cutting wheels 40 can be mounted on a plate-shaped bearing plate 34 lying between the cutting wheels 40, which is on an underside in each case of a box-shaped housing 32 is attached. The respective plate holders 60 for the clearing plates 50 can also be attached to the bearing plate 34 for each pair of cutting wheels 40 . In the exemplary embodiment shown, the plate holders 60 have a holding shaft 62 flanged to the bearing plate 34 . A holding block 64 can be fastened to the holding shaft 62, to which the clearing plates 50 for each cutting wheel 50 can be detachably fastened, preferably via screw connections.

According to the invention, the plate holders 60, which preferably extend essentially parallel to the axes of rotation of the cutting wheels 40, are arranged at a distance from the box-shaped housing 32 of the trench wall cutter 30 in such a way that a free space or passage 70 is formed between the respective plate holder 60 and the housing 32. how about out figure 3 can be seen.

A first feed device 56 for feeding a settable suspension into the area between the cutting wheels 40 can be provided centrally between the two plate-shaped end shields 34 on the underside of the housing 32 . Alternatively or additionally, one or more feed devices can be provided in tubular holding shafts 62 .

The cutting wheels 40 can be driven in rotation via a drive device, not shown in detail, which in the exemplary embodiment shown can be in particular hub motors in the hubs 42 of the cutting wheels 40, so that they each turn inwards. This is shown in the figure 5 indicated with arrows indicating the direction of rotation.

With such driving of the cutting wheels 40 according to figure 5 For example, in the case of soil material removed during milling operation, this can be mixed into a soil mortar in the central region between the milling wheels 40 by means of a settable suspension that is supplied. The soil material removed and the soil mortar produced can flow upwards through the respectively formed passage 70 as a result of the arrangement of the clearing plates 50 on the plate holders 60 spaced apart from the housing 32, as indicated by the flow arrows in FIG figure 5 is indicated schematically. The peripheral dimensions of the box-shaped housing 32 are smaller than a milling cross section which is produced by the milling wheels 40 .

The outer edges of the clearing plates 50 can be designed correspondingly inclined inwards, so that an upward flow of the milled soil material and suspension through the passage 70 between the plate holder 60 and the housing 32 is supported. In this way, especially when milling rocky or stony soil layers, larger rocks can also be efficiently removed from the area of the milling wheels 40 and up past the housing 32, thereby reducing the risk of damage to the clearing plates 50 and milling teeth.

Claims (15)

Trench wall cutter with - a box-shaped housing (32) on the top of which a lifting device (20) can be attached, - at least one cutting wheel (40), which is arranged on an underside of the housing (32) and can be driven in rotation to remove soil material, cutting teeth (44) being arranged in at least one circumferential row along the outer circumference of the cutting wheel (40), on which at least an axial circumferential clearance (46) is adjacent, and - at least one clearing plate (50), which is arranged relatively fixed to the housing (32) and engages in the at least one circumferential clearance (46) on the cutting wheel (40) for clearing soil material, characterized, - that the at least one clearing plate (50) is attached to a plate holder (60) at a distance from the housing (32), a passage (70) being formed between the at least one clearing plate (50) and the housing (32), through which in Operation milled soil material can be passed upwards. Trench wall cutter according to claim 1,
characterized,
in that at least two circumferential rows of cutting teeth (44) are arranged on the at least one cutting wheel (40), which are spaced apart axially from one another by a circumferential free space (46) in which a clearing plate (50) engages. Trench wall cutter according to claim 1 or 2, characterized, that the at least one cutting wheel (40) is mounted on a plate-shaped bearing plate (34) on the underside of the housing (32) and that the at least one clearing plate (50) is attached to the bearing plate (34) with the plate holder (60). Trench wall cutter according to one of claims 1 to 3,
characterized,
that two pairs of cutting wheels (40) are arranged on the underside of the housing (32). Trench wall cutter according to claim 4, characterized, that one cutting wheel (40) of each pair of cutting wheels (40) is mounted on one side of the bearing plate (34) and that each cutting wheel (40) is assigned at least one clearing plate (50), which is attached to the bearing plate (34) via a plate holder (60). Trench wall cutter according to claim 5,
characterized,
that each cutting wheel (40) is assigned a passage (70) which is delimited by the housing (32), the bearing plate (34) and the assigned at least one clearing plate (50) with the plate holder (60). Trench wall cutter according to one of claims 1 to 6,
characterized,
that a supply device (56) for supplying a liquid, in particular a curable suspension, is arranged. Trench wall cutter according to claim 7,
characterized,
that the feed device (56) is arranged between two pairs of milling wheels (40) and/or in at least one of the panel holders (60). Trench wall cutter according to one of claims 1 to 8,
characterized,
that an outer circumference of the housing (32) is smaller than a milling cross section of the milling wheels (40). Trench wall cutter according to one of claims 1 to 9,
characterized,
that a drive device, in particular a hydraulic motor or an electric motor, for driving the cutting wheels (40) is arranged in the housing (32). Trench wall cutter according to one of claims 1 to 9,
characterized,
that the at least one cutting wheel (40) has a hub (42) in which a hub motor is arranged. Trench wall cutter according to one of claims 1 to 11,
characterized,
that the at least one clearing plate (50) and/or the plate holder (60) are detachably fastened and a connecting device is provided on the underside of the housing (32) with which at least one clearing plate (50) can be fastened directly to the housing (32). . Trench wall milling device with a carrier device (12) on which a trench wall milling cutter (30) is arranged so that it can move vertically with a lifting device (20),
characterized,
that a trench cutter (30) according to any one of claims 1 to 12 is provided. method of creating a milled slot in the ground,
characterized,
that a trench wall milling cutter (30) according to one of claims 1 to 12 or a trench wall milling device (10) according to claim 13 is used. Method according to claim 14,
characterized,
that the at least one cutting wheel (40) is driven to rotate in one direction of rotation, with ground material that has been cut off being guided by the at least one clearing plate (50) through the passage (70) between the housing (32) and the clearing plate (50).

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