EP1640509A1 - Method of making a sloted wall in ground and device therefor - Google Patents

Abstract

The cutter (1) has lower and upper cutting/mixing wheels (22,32) arranged at the bottom and top of a frame (10) respectively. An intermediate portion of the frame is set between the wheels and is formed with smaller cross-section relative to the cutting cross-section of the lower cutting/mixing wheels. An independent claim is also included for method for forming trench wall.

Description

The invention relates to a device for creating a slot wall in the ground. The invention further relates to a method for creating a slot wall in the ground.

A method for producing a slot wall in the ground is known from DE 195 30 827 C2. In this so-called two-phase process, a milling slot is excavated in a first phase and the excavated soil excavation of the milling slot is conveyed to above ground. The resulting milling slot is filled with a support suspension and thereby supported. In a second phase after the sinking of the milling slot, a hardening suspension is introduced into the slot while displacing the support suspension.

In a one-phase process known from DE 41 41 629 C2, the slot is supported from the beginning by a hardening suspension, which is produced by mixing excavated soil material with a settable liquid surface.

To carry out these known methods can be found in DE 34 24 999 C2 known trench cutters application. These known trench wall cutters have a trimming frame as well as at this bottom, ie bottom-mounted, rotating drivable cutting wheels, which serve for clearing of soil material on the slot bottom. The cleared soil material is from fed to the cutting wheels attached to the milling frame suction and transported to the surface.

From the German patent application with the file number 103 08 538 a further method for producing a slot wall is known. In this so-called "mixed-in-place" process, the hardening suspension is not produced outside the slot but directly in the slot itself. For this purpose, ground material removed by the cutting wheels is, as it were, mixed with the settable liquid "in situ" by the action of the cutting wheels in the milling slot, thereby producing a hardening liquid-soil mixture. In this method, the mixed with the curable liquid, cleared soil material is at least partially left in the milling slot, where it can harden to form the slot wall. This eliminates the need to elaborate the entire cleared soil material by pumping equipment consuming to overground.

The object of the invention is to provide a device and a method with which slot walls of particularly high quality can be created.

This object is achieved by a device having the features of claim 1 and a method having the features of claim 12. Preferred embodiments are given in the respective dependent claims.

The invention is on the one hand in a device for creating a trench wall in the ground, with a frame, at least one arranged below the frame, lower milling / mixing wheel, at least one further, arranged at the top of the frame, upper milling / mixing wheel, wherein the frame in an intermediate region between the upper milling / mixing wheel and the lower milling / mixing wheel of smaller cross-section relative to the milling cross-section of the at least one lower milling / mixing wheel is formed.

A first basic idea of the invention can be seen therein, both below, i. on the bottom side, to provide milling / mixing wheels on the milling frame as well as on top of the milling frame. The at least one lower milling / mixing wheel is preferably projecting in the direction of advance and the at least one upper milling / mixing wheel protrudes in the direction opposite to the direction of advance on the frame. Due to the mutual arrangement of milling / mixing wheels on the frame, a particularly good comminution and mixing of milled ground material is made possible. In particular, in the case of an "in situ" suspension preparation in the slot with the device according to the invention, a particularly high suspension homogeneity can be achieved and consequently a particularly high diaphragm wall quality can be obtained. In addition, a particularly high milling progress can be achieved by a combined milling action of the upper and lower milling / mixing wheels.

Another basic idea of the invention can be seen in forming the frame at least partially with a cross section which is smaller than the milling cross section of the at least one lower milling / mixing wheel. As a result, a mixing and transport area is created in the slot between the upper and lower milling / mixing wheels, through which a material exchange between the upper and lower milling / mixing wheels is made possible. Since a flow can be generated in this mixing and transport area both from the upper and from the lower milling / mixing wheel, a particularly effective material mixing takes place in this area, whereby the suspension homogeneity is further increased. For a particularly good material exchange, the frame in the intermediate region is preferably also of smaller cross-section relative to the milling cross-section of the at least one upper milling / mixing wheel.

The device according to the invention can also be referred to as a milling cutter, in particular as a trench wall cutter. The milling / mixing wheels can circumferentially cutting teeth, roller chisel or other tillage tools for removing pending Have soil material. However, at least some of the milling / mixing wheels can in principle also be designed without such tillage tools, in which case the mixing effect of these wheels is in the foreground. To further improve the mixing effect, at least some of the milling / mixing wheels can be provided with additional mixing elements, for example with mixing paddles. In principle, it is possible for the at least one lower milling / mixing wheel and the at least one upper milling / mixing wheel to be of identical construction, wherein the wheels may also be designed to be mirror-symmetrical to one another for opposite rotational operation. However, it is particularly preferred that only the lower milling / mixing wheel has peripherally tillage tools and / or that the at least one upper milling / mixing wheel has additional mixing elements.

In principle, the cross-sectionally smaller intermediate region of the frame can be formed, for example, by a step in the frame. However, it is particularly preferred that the frame is formed waisted between the upper milling / mixing wheel and the lower milling / mixing wheel. This may in particular be understood to mean that the cross-section of the frame continuously tapers in the direction of advance in at least one spatial direction, starting from the upper milling / mixing wheel, and widens continuously again in front of the lower milling / mixing wheel. In the context of the invention, a cross-section can in particular be understood as a section perpendicular to the direction of advance of the milling cutter.

The milling cross section of the at least one lower milling / mixing wheel is suitably configured at least approximately rectangular. It is particularly preferred that the cross-sectional width of the frame in the intermediate region is three quarters or less, in particular half or less, the Fräsquerschnittsbreite the at least one lower milling / mixing wheel and / or that the cross-sectional length of the frame in the intermediate region three quarters or less, in particular half or less, the milling cross-section length of at least a lower milling / mixing wheel is. As a result, a mixing and transport area is created around the intermediate area, in which a particularly effective mixing of the suspension can take place. The width and length specifications may in particular be related to an at least approximately rectangular milling cross section, wherein the frame itself, in particular in the intermediate region, does not necessarily have to be formed with a rectangular cross section. In the case of a non-rectangular frame, the cross-sectional width and length may be understood to mean the cross-sectional dimensions of the frame parallel to the sides of the approximately rectangular cross-section. If several lower milling / mixing wheels are present, the total milling cross section of all these wheels can be understood by the milling cross section of the at least one lower milling / mixing wheel. Analog can be understood by the milling cross section of the at least one upper milling / mixing wheel of the total milling cross section of all upper milling / mixing wheels. Advantageously, the milling cross section of the at least one upper milling / mixing wheel is also at least approximately rectangular and in particular at least approximately identical to the milling cross section of the at least one lower milling / mixing wheel.

A particularly suitable and structurally particularly simple device for receiving the forces occurring during milling operation is characterized in that the frame and / or the milling / mixing wheels mirror-symmetrical, in particular to a plane perpendicular to the advancing direction mirror plane and / or to a mirror plane extending in the advancing direction , are formed. The direction of advancement can be understood as the direction in which the mill according to the invention moves in the slot position, i. the direction in which the mill is sunk.

A further preferred embodiment of the invention is that two lower milling / mixing wheels and two upper milling / mixing wheels are provided in particular axially parallel, and that the frame in particular arranged X-like with a middle frame part and four preferably obliquely to the advancing direction Milling shields on which the milling / mixing wheels are mounted, is formed. According to this embodiment, the frame is designed like a cross, with at least one milling / mixing wheel, in each case a pair of wheels, being mounted at each end of the four legs of the cross. The legs of the cross are preferably formed by the milling blades.

It is also particularly advantageous that the milling / mixing wheels are designed as pairs of wheels with two individual wheels, which are in particular arranged coaxially on both sides of a milling blade of the frame. The individual milling / mixing wheels can also have more than two individual wheels. In principle, any number of milling / mixing wheels can be provided according to the invention.

The device according to the invention is particularly suitable for a "mixed-in-place" slotted wall method in which the suspension hardening to the slot wall is not produced outside the slitting slot, but directly in the slitting slot itself by action of the milling / mixing wheels of abraded soil material and a settable liquid becomes. In particular, in this context, it is particularly advantageous that a liquid supply means for supplying a settable liquid is provided in the slot on the underside of the frame, in particular between two adjacent lower milling / mixing wheels. The arrangement of the liquid supply between the two milling / mixing wheels allows a particularly uniform mixing of the liquid with the soil material on both milling / mixing wheels. In principle, however, the liquid supply device can also be formed separately from the frame and / or the milling cutter.

Another advantageous aspect of the invention is that at least at the lower milling / mixing wheel cutting teeth are provided for clearing pending soil material, and that on the frame Räumplatten are provided, which protrude to clear the cutting teeth of cleared soil material between adjacent cutting teeth. When operating the milling / mixing wheels the cutting teeth are guided past the clearing plates, wherein adhering to the cutting teeth soil is stripped by the clearing plates. This allows a particularly good milling progress. The Räumplatten can be provided in particular for clearing trained as folding teeth milling teeth, which are arranged for processing of soil material below the milling blade pivotally mounted on the milling / mixing wheels.

For directional control of the device when sinking can be inventively provided that preferably hydraulically actuated control stamp are provided on the frame, which are extendable to rest on the inner walls of the slot transverse to the advancing direction, in particular approximately parallel to the axes of rotation of the milling / mixing wheels. By extending this tax stamp to the inner walls of the slot, the frame can be pressed off the walls and its position, in particular its inclination in the slot, be changed, whereby the further Abteufrichtung is changed. Preferably, the control stamp on round, in particular approximately circular or oval support surfaces, which may also be convex. In particular, the tax stamps may be mushroom-shaped. The tax stamps are suitably arranged on stamp holders, which in turn are in turn arranged on the frame and, in particular, protrude laterally from the latter. At these stamp holders drives, in particular hydraulic cylinders, can be provided for extending and retracting the control stamp. In principle, the control punches can be extendable in any direction on the frame, wherein it is preferred that the control punches are extendable approximately parallel to the axes of rotation of the milling / mixing wheels. The tax stamps are preferably arranged on the middle frame part in the intermediate region.

Advantageously, two tax stamps are provided on each tax stamp holder, which form a tax stamp pair. The two tax stamps of a tax stamp pair are advantageously arranged coaxially and / or on opposite Frame sides extendable out of the frame. It is particularly preferred that on both sides of the frame in each case two pairs of tax stamps are arranged one above the other. Advantageously, two pairs of tax stamps are positioned at the same height on the frame.

For lowering and pulling the device is preferred that a rope and / or a telescopic drill pipe is provided, on which the frame is suspended at its upper side. The telescopic drill pipe can be designed in particular as a Kelly bar. Advantageously, a headband is provided on the rope or on the drill pipe to which the frame is mounted.

A particularly versatile device according to the invention is characterized in that the milling cross-section of the at least one upper milling / mixing wheel and / or the at least one lower milling / mixing wheel is variable. For this purpose, for example, an adjusting device may be provided, with which the axial spacing of the upper milling / mixing wheels and / or the lower milling / mixing wheels is adjustable. Alternatively or additionally, with the adjusting device and the cutting radius of the respective milling / mixing wheels can be changed.

If several, in particular two, lower milling / mixing wheels are provided, these are suitably arranged side by side, i. their axes of rotation are, in particular with respect to the downwardly pointing direction of advance, at the same height. Likewise, provided that a plurality of upper milling / mixing wheels are provided, these are also preferably arranged next to one another.

A further aspect of the invention can be seen in a method for creating a trench wall in the ground, in which a trench cutter with a frame, two bottom of the frame next to each other, lower milling / mixing wheels and two on top of the frame arranged side by side, upper milling / mixed wheels provided that the milling / mixing wheels are rotated by means of a rotary drive, and the trench wall cutter is sunk into the ground and pulled back after reaching a final depth, both the top two milling / mixing wheels and the two lower milling / mixing wheels be driven in opposite directions by means of the rotary drive.

The inventive method can be carried out in particular by means of the device according to the invention, wherein the advantages described in this context can be achieved.

A basic idea of the method according to the invention can be seen in the fact that a trench wall cutter with at least two lower milling / mixing wheels and at least two upper milling / mixing wheels is provided, the two lower milling / mixing wheels having opposite directions of rotation and also the two upper milling wheels. / Mixing wheels are driven in opposite directions of rotation. By this opposite operation of both the upper and the lower milling / mixing wheels bleeding of the trench wall cutter can be largely prevented, which geometrically very well defined cutting slots can be made. At the same time there is a particularly efficient removal of processed at the bottom of the slot soil material. Finally, a particularly good mixing of the processed soil material with a settable liquid to form a curable suspension, especially if the settable liquid fed centrally between the two lower milling / mixing wheels and / or between the two upper milling / mixing wheels in the milling slot becomes. According to the invention, the opposite operation of the milling / mixing wheels can basically be provided both when sinking and when pulling the trench wall cutter. The milling / mixing wheels can also be shut down when pulling the trench wall cutter. For a particularly good mixing of the suspension, it is advantageous that the milling / mixing wheels be driven to rotate while pulling, the direction of rotation of the milling / mixing wheels can also be changed basically alternately.

The efficiency of Materialabtransportes in the milling slot can be improved by the fact that when the trench wall cutter at the bottom of the slot excavated soil material is carried away by the rotation of the lower milling / mixing wheels of the milling center. This embodiment is particularly advantageous when the processed soil material is not sucked out of the milling slot, but remains for "in situ" mixing with a settable liquid in the milling slot. According to this embodiment, the lower milling / mixing wheel arranged clockwise in the operating state of the miller in the front view is operated in the clockwise direction and the lower milling / mixing wheel arranged in the operating state of the miller to the right in the counterclockwise direction. The processed soil material is preferably conveyed into the mixing and transport area, which is formed around the frame in its intermediate area. This ensures a particularly effective mixing of the soil material with the settable liquid. At the same time supports the tangential movement of the lower milling / mixing wheels on the inner walls of the Frässchlitzes the Abteufbewegung the trench wall cutter in the advancing direction.

In principle, it is possible to operate the upper milling / mixing wheels in any direction of rotation compared to the milling / mixing wheels underneath. For example, it may be provided that the milling / mixing wheels lying one on top of the frame are respectively rotated in opposite directions, ie that the two milling / mixing wheels arranged on the left of the frame are rotated with different directions of rotation, as well as the two milling / mixing wheels arranged on the right of the frame. mixed wheels. However, it is particularly preferred that the milling and mixing wheels lying one on top of the frame are driven in the same direction. In this case, a particularly good material removal is guaranteed.

In principle, it is also possible to select the direction of rotation of the milling / mixing wheels when pulling the trench wall cutter equal to the direction of rotation when sinking. However, it is particularly preferred that the direction of rotation of at least the lower milling / mixing wheels for pulling the trench wall cutter is reversed. Suitably, the direction of rotation of the upper milling / mixing wheels for pulling the trench wall cutter is reversed. The resulting change in the flow profile on the trench wall cutter can further improve suspension mixing.

With regard to the direction of rotation of the milling / mixing wheels, it is advantageous that the milling / mixing wheels perform due to their rotational movement on the inner walls of the slot a tangential movement, which is directed opposite to the current axial movement of the trench wall cutter. In this way, the rotational movement of the milling / mixing wheels supports the axial Abteuf- and pulling movement of the trench wall cutter and axial drive means for sinking and pulling the trench wall cutter can be dimensioned correspondingly less expensive.

Fig. 1

eine Frontansicht einer erfindungsgemäßen Vorrichtung zum Erstellen eines Schlitzes im Erdboden;

Fig. 2

eine Seitenansicht der Vorrichtung aus Fig. 1;

Fig. 3

eine Frontansicht einer weiteren erfindungsgemäßen Fräse zur Erläuterung der Drehrichtung der Fräs-/Mischräder beim Abteufen der Fräse;

Fig. 4

eine Frontansicht der Fräse aus Fig. 3 zur Erläuterung der Drehrichtung der Fräs-/Mischräder beim Ziehen der Fräse; und

Fig. 5

eine Seitenansicht eines Baugerätes mit einer erfindungsgemäßen Vorrichtung.

The invention will be explained in more detail with reference to preferred embodiments, which are illustrated in the figures. In the figures show schematically:

Fig. 1

a front view of an apparatus according to the invention for creating a slot in the ground;

Fig. 2

a side view of the device of Fig. 1;

Fig. 3

a front view of another milling cutter according to the invention for explaining the direction of rotation of the milling / mixing wheels when sinking the miller;

Fig. 4

a front view of the milling machine of Figure 3 to explain the direction of rotation of the milling / mixing wheels when pulling the cutter. and

Fig. 5

a side view of a construction equipment with a device according to the invention.

Equivalent elements are identified in all figures with the same reference numerals.

An inventive device for creating a slot wall in the ground, which can also be referred to as a trench wall cutter 1, is shown in FIGS. 1 and 2. The trench wall cutter 1 comprises a supporting frame 10, at the lower, i.e. the lower part, of the trench wall. bottom end two lower milling / mixing wheels 21, 22 are rotatably mounted at the same height. On its upper side, two upper milling / mixing wheels 31, 32 are likewise rotatably mounted at the same height on the frame 10.

The milling / mixing wheels 21, 22, 31, 32 are all formed as pairs of wheels with two individual wheels, which are both coaxial on either side of a milling blade 24, 25, 34, 35 are mounted. This is shown in FIG. 2 using the example of the upper milling / mixing wheel 32, whose two individual wheels 37, 38 are arranged on both sides of the milling blade 35. Furthermore, this is shown in Fig. 2 using the example of the lower milling / mixing wheel 22, the two individual wheels 27, 28 are rotatably mounted on both sides of the milling blade 25. The remaining milling / mixing wheels 21, 31 are formed in a similar manner as pairs of wheels.

The frame 10 has centrally a central frame middle part 15. This frame middle part 15 is in the form of a straight prism with a hexagonal base. At its two upper, adjacent lateral surfaces are on the central frame part 15, the two Frässchilde 34, 35 of the upper milling / mixing wheels 31, 32 out. At its two lower, adjacent lateral surfaces are on the central frame part 15, the two Frässchilde 24, 25 of the two lower milling / mixing wheels 21, 22 out. The milling blades 24, 25, 34, 35, which can be considered as elements of the frame 10, extend at an angle, ie not parallel to the advancing direction 80, which is the Abteufrichtung the trench wall cutter 1 represents. The milling blades 24, 25, 34, 35 together with the frame center part 15 a cross-like or X-like structure, wherein the cross legs of the Frässchilden 24, 25, 34, 35 are formed. The cross arms formed by the milling blades 24, 25, 34, 35 are not arranged at right angles to each other. Rather, the included by the Frässchilden 24, 25 angle as well as the included by the Frässchilden 34, 35 angle is less than 90 °.

On the circumference of the milling / mixing wheels 21, 22, 31, 32 fixed cutting teeth 42 are arranged with a cutting edge for releasing pending soil material. Their respective milling blade 24, 25, 34, 35 adjacent to the milling / mixing wheels 21, 22, 31, 32 next to it as folding teeth 43 formed cutting teeth. These folding teeth 43 are pivotable by means of a pivot drive in a peripheral region of the respective Frässchildes 24, 25, 34, 35. In particular, by this folding teeth 43 below the milling blades 24, 25 befindliches soil material can be processed.

By operating the lower milling / mixing wheels 21, 22 below the trench wall 1 befindliches soil material is processed in an approximately rectangular milling cross-section. This milling cross-section has a Fräsquerschnittsbreite BF and a Fräsquerschnittslänge LF, wherein the width here on the Drehachsrichtung the lower milling / mixing wheels 21, 22 is related. The axes of rotation of the lower milling / mixing wheels 21, 22 and the axes of rotation of the upper milling / mixing wheels 31, 32 are arranged parallel to each other. The center distance of the axes of rotation of the two lower milling / mixing wheels 21, 22 corresponds to the center distance of the axes of rotation of the two upper milling / mixing wheels 31, 32. The upper milling / mixing 31 is based on the downward drive direction 80 above the lower milling - / mixing wheel 21 arranged and the upper milling / mixing wheel 32 above the lower milling / mixing wheel 22. In this case, all milling / mixing wheels 21, 22, 31, 32 have the same wheel diameter. Because of this geometric arrangement and design of the milling / mixing wheels 21, 22, 31, 32 corresponds to the milling cross section of the upper milling / mixing wheels 31, 32 the milling cross section of the lower milling / mixing wheels 21, 22nd

In an intermediate region 12, which is provided on the frame central part 15, the frame 10 is formed with a taper, at which this cross section smaller in relation to the milling cross section of both the lower milling / mixing wheels 21, 22 and the upper milling / mixing wheels 31, 32nd is. As a result, a mixing and / or transport region 54 is formed at the intermediate region 12 between the inner walls 4, 4 'of the slot and the frame 10, in which a thorough mixing of processed soil material with a settable liquid can take place. For supplying the settable liquid into the milling slot, a liquid supply device 50 designed as a nozzle is provided in the milling center 7, between the two lower milling / mixing wheels 21, 22.

As can be seen in Fig. 1, the frame 10 is formed to form the tapered intermediate portion 12 in its cross-sectional length LR, starting from the Frässchilden 24, 25, 34, 35, waisted. As can be seen from FIG. 2, the cross-sectional width BR of the frame 10 is substantially constant over its height. In the intermediate region 12 on the middle frame part 15, the cross-sectional width BR of the frame 10 is about 0.45 times the Fräsquerschnittsbreite BF and the cross-sectional length LR of the frame 10 is about 0.45 times the Fräsquerschnittslänge LF.

The frame 10 with its Frässchilden 24, 25, 34, 35 and the milling / mixing wheels 21, 22, 31, 32 is formed in three mirror-symmetrical, with a first mirror plane 75 is arranged perpendicular to the drive direction 80 and two further, mutually perpendicular mirror planes 71, 72 extend parallel to the drive direction 80.

At the Frässchilden 24, 25, 34, 35 are clearing plates 46, 46 'are provided, which project between adjacent cutting teeth 42 and / or folding teeth 43. For this purpose, the clearing plates 46, 46 'approximately radially to the milling / mixing wheels 21, 22, 31, 32 are arranged. Upon rotation of the milling / mixing wheels 21, 22, 31, 32, the cutting teeth 42 and / or the folding teeth 43 move past the clearing plates 46, 46 ', thereby abrading the cutting teeth 42 and / or the folding teeth 43 adhering soil material and The teeth are thus freed from the soil. To drive the milling / mixing wheels 21, 22, 31, 32, not shown in the figures, hydraulic drive motors are provided in the interior of the frame center part 15 of the frame 10.

On the side of the middle frame 15 of the frame 10 control stamp 60, 60 'are provided for directional control of the trench wall cutter 1 approximately parallel to the axes of rotation of the milling / mixing wheels 21, 22, 31, 32 and perpendicular to the drive direction 80 in an abutment position against the inner walls. 4 'of the slot extendable and retractable. The control stamps 60, 60 'are mushroom-shaped and have head-side convexly curved and in the front view circular support surfaces 62 for abutment against the inner walls 4' of the slot.

2, the control dies 60, 60 'are arranged coaxially in pairs on both sides of the frame 10, wherein one of the two control stamps 60 of each pair of tax stamps in the front view of FIG. 1 on the front of the frame 10 and the other tax stamp 60' behind Frame 10 is arranged. As can also be seen from FIG. 1, a total of four pairs of control stamps are provided on the frame 10, of which two are mounted at the same height with respect to the downwardly directed advancing direction 80 in the front view on the left and right of the middle frame part 15. The two control stamps 60, 60 'of each pair of tax stamps are mounted in a common stamp holder 64 which surrounds the tax stamps 60, 60' in the manner of a sleeve. In the punch holder 64 are not shown in the figures, drives for extending and retracting the control stamp 60, 60 'are provided.

For suspending the trench wall cutter 1 on a rope, not shown in FIGS. 1 and 2, or a Kelly bar, a holding bracket 17 is provided, which is mounted on the trench blades 24, 25 at the top of the trench wall cutter 1.

The direction of rotation of the milling / mixing wheels 21, 22, 31, 32 of a trench wall cutter 1 according to the invention when carrying out a method according to the invention is shown in FIGS. 3 and 4. Fig. 3 shows the state when sinking and Fig. 4 shows the state when pulling the trench wall cutter 1. The corresponding axial movement of the trench wall cutter 1 is indicated by the arrows R.

As can be seen from FIG. 3, the lower milling / mixing wheels 21, 22 are rotated when the milling cutter is lowered in such a way that abraded soil material and settable liquid introduced into the milling slot are conveyed away from the milling center 7 to the inner walls 4 of the slot. For this purpose, the milling / mixing wheel 21 arranged on the left is rotated in the clockwise direction and the milling / mixing wheel 22 arranged on the right is rotated in the counterclockwise direction. The above the lower milling / mixing wheels 21, 22 arranged upper milling / mixing wheels 31, 32 are operated in the same direction as the respective underlying milling / mixing wheels 21, 22, i. the upper milling / mixing wheel 31 arranged on the left in the clockwise direction, the upper milling / mixing wheel 32 arranged on the right in the counterclockwise direction.

4, the direction of rotation of all milling / mixing wheels 21, 22, 31, 32 is reversed.

The direction of rotation of the milling / mixing wheels 21, 22, 31, 32 is chosen so that these wheels move tangentially at their point of contact with the inner walls 4 'of the slot due to their rotational movement of the axial movement R of the mill.

5 shows a construction device 100 on which a trench wall cutter 1 according to the invention is arranged. The construction equipment has an undercarriage 102 configured as a caterpillar drive and a superstructure 101 rotatably mounted thereon. At the Oberwa conditions 101, a mast 110 is pivotally articulated about a horizontally extending axis. For pivoting the mast 110, a hydraulic actuating cylinder 112 is provided, which is directed on the one hand on the upper carriage 101 and on the other hand on a sleeve 114, which surrounds the mast 110 at least in sections.

To hang the trench wall cutter 1, a cable 90 is provided, which can be actuated by a winch 95 arranged on the superstructure 101. The expiring from the winch 95 rope 90 is guided over several pulleys 94, 94 ', 94' 'around the mast 110. From the uppermost guide pulley 94, the cable extends to a rope bottle 92 to which the trench wall cutter 1 is suspended. The rope 90 is reeved in the rope bottle 92 zweisträngig.

In addition to the cable 90, hydraulic and fluid lines 120 for supplying the trench wall cutter 1 with hydraulic fluid and settable liquid are also provided on the construction equipment. These hydraulic and fluid lines 120 are windable by means of a superstructure 101 arranged winch device 125. From there, they run over a likewise arranged on the mast 110 guide roller 124 to the trench wall 1.

Claims (15)

Device for creating a diaphragm wall in the ground, with a frame (10), at least one lower milling / mixing wheel (21, 22) arranged at the bottom of the frame (10), - At least one further, at the top of the frame (10) arranged upper milling / mixing wheel (31, 32), wherein - The frame (10) in an intermediate region (12) between the upper milling / mixing wheel (31, 32) and the lower milling / mixing wheel (31, 32) cross-section smaller in relation to the milling cross-section of the at least one lower milling / mixing wheel ( 21, 22) is formed. Device according to claim 1,
characterized,
that the frame (10) between the upper cutting / mixing wheel (31, 32) and the lower milling / mixing wheel (21, 22) is formed waisted. Device according to one of claims 1 or 2,
characterized, - that the cross-sectional width (BR) of the frame (10) in the intermediate region (12) is three quarters or less, in particular half or less, the Fräsquerschnittsbreite (BF) of the at least one lower cutting / mixing wheel (21, 22), and / / or - That the cross-sectional length (LR) of the frame (10) in the intermediate region (12) three quarters or less, in particular half or less, the Fräsquerschnittslänge LF) of the at least one lower milling / mixing wheel (21, 22). Device according to one of claims 1 to 3,
characterized,
in that the frame (10) and / or the milling / mixing wheels (21, 22, 31, 32) are mirror-symmetrical, in particular to a mirror plane (75) running perpendicular to the advancing direction (80) and / or to a drive direction (80) Mirror plane (71, 72), are formed. Device according to one of claims 1 to 4,
characterized, - That two lower milling / mixing wheels (21, 22) and two upper milling / mixing wheels (31, 32) are provided in particular axially parallel, and - that the frame (10) in particular X-like with a frame center part (15) and four obliquely to the advancing direction (80) arranged Frässchilden (24, 25, 34, 35) at which the milling / mixing wheels (21, 22, 31, 32) are mounted, is formed. Device according to one of claims 1 to 5,
characterized,
that on the underside of the frame (10), in particular between two adjacent lower milling / mixing wheels (21, 22), a liquid supply means (50) for supplying a settable liquid is provided in the slot. Device according to one of claims 1 to 6,
characterized, - That at least at the lower milling / mixing wheel (21, 22) cutting teeth (42, 43) are provided for clearing pending soil material, and - That the frame (10) Räumplatten (46, 46 ') are provided, which for freeing the cutting teeth (42, 43) of cleared soil material between adjacent cutting teeth (42, 43) through. Device according to one of claims 1 to 7,
characterized,
that on the frame (10) preferably hydraulically actuated control stamps (60, 60 ') are provided, for abutment against the inner walls (4, 4') of the slot transversely to the advancing direction (80), in particular approximately parallel to the axes of rotation of the milling / Mixing wheels (21, 22, 31, 32), are extendable. Device according to claim 8,
characterized,
that on both sides of the frame (10) in each case two pairs of tax stamps are arranged one above the other. Device according to one of claims 1 to 9,
characterized,
that a cable (90) and / or a telescopic drill pipe is provided, on which the frame (10) is suspended on its upper side. Device according to one of claims 1 to 10,
characterized,
that the cutting cross section of the at least one upper cutting / mixing wheel (31, 32) and / or the at least one lower cutting / mixing wheel (21, 22) is variable. Method for creating a diaphragm wall in the ground, in particular by means of a device according to one of Claims 1 to 11, in which - A trench wall cutter (1) with a frame (10), two at the bottom of the frame (10) arranged side by side, lower milling / mixing wheels (21, 22) and two at the top of the frame (10) side by side, upper milling / mixing wheels (31, 32) is provided, - The milling / mixing wheels (21, 22, 31, 32) are rotated by means of a rotary drive, and - The trench wall cutter (10) sunk into the ground and pulled back after reaching a final depth, wherein - Both the upper two mixing / mixing wheels (31, 32) and the two lower milling / mixing wheels (21, 22) are driven in opposite directions by means of the rotary drive. Method according to claim 12,
characterized,
in that, during the sinking of the trench wall cutter (1), ground material worked off at the bottom of the slot is conveyed away from the milling center (7) by the rotation of the lower milling / mixing wheels (21, 22). Method according to one of claims 12 or 13,
characterized,
that on the frame (10) superimposed milling / mixing wheels (21, 31, 22, 32) are driven in opposite directions or in the same direction. Method according to one of claims 12 to 14,
characterized,
that the sense of rotation of at least the lower cutting / mixing wheels (21, 22) is reversed to pull the trench wall cutter (1).

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