Soil working implement, in particular implement for making foundation slots

Abstract

The invention relates to a soil cultivation device (10), in particular a trench cutter (10), for creating a soil trench (2), which can be connected to a working machine, comprising a frame (14) extending along a longitudinal axis, which has a rectangular cross-section transverse to the longitudinal axis, a soil cultivation tool (15) arranged on a lower section of the frame (14), a clamping device (20) with at least two clamping elements (22) arranged on opposite sides of the frame (14), which are actively adjustable relative to the frame (14) in order to press the clamping elements (22) against the inner walls of a soil trench (2), and a feed device (30) for generating a feed force on the soil cultivation tool (15) within a soil trench (2), by means of which the clamping elements (22) and the frame (14) are actively adjustable relative to each other along the longitudinal axis.wherein the clamping elements are arranged on the short sides of the frame (14). The invention further relates to a working machine and a set with such a soil cultivation device (10) as well as a method for creating a soil slit (2) using the soil cultivation device (10).

Description

[0001] The present invention relates to a soil cultivation implement, in particular a trench cutter, for creating a soil trench according to the preamble of claim 1, and to a working machine for such a trench. The invention further relates to a set and a method for creating a soil trench.

[0002] Diaphragm walls are typically constructed by creating trenches in the ground using specialized soil preparation equipment and then filling these trenches with concrete. Steel reinforcement cages can be inserted into the trenches to stabilize the walls. The soil preparation equipment used includes diaphragm wall cutters or diaphragm wall grabs, which are suspended from construction machinery such as mobile cranes or cable excavators. Diaphragm wall cutters have one or more milling wheels as their soil preparation tool, while diaphragm wall grabs generally use a clamshell bucket. The diaphragm walls are typically constructed by sequentially creating adjacent diaphragm wall panels.

[0003] The production of diaphragm wall panels often employs a so-called "pilgrim step." First, so-called primary panels are created, which are not adjacent to each other but rather spaced apart in the ground. A section of undisturbed soil remains between these primary panels. Once the primary panels have hardened to the required strength, the connecting sections (so-called secondary panels) can be constructed.

[0004] The spacing between the primary lamellae is typically slightly smaller than the width of the secondary lamellae along their long sides (i.e., the secondary lamellae do not quite fit into the space between the primary lamellae). This causes the secondary lamellae to overlap with the existing primary lamellae, creating an intersection with the hardened primary lamellae. The aim is to achieve a cohesive bond between the final reinforced concrete structure and the ground. An example of such an arrangement of diaphragm wall lamellae is shown in the Figure 1 shown in a top view, wherein a floor slot for a secondary lamella 2 to be erected is arranged between two already completed primary lamellae 1, which are each arranged at an angle to the floor slot 2 and are overlapped by its corner areas (see areas 3 in Fig. 1), as may be necessary, for example, when constructing a shaft. The surrounding soil is designated with reference symbol 4.

[0005] Such a procedure may be necessary, for example, if the constructed diaphragm wall has to meet watertightness requirements or if the desired strength of the structure demands it. To create this overlapping connection, diaphragm wall cutters are used, and their milling tools create an overlap with the already concreted primary panels. However, this overlap must not be too large to avoid damaging the embedded steel reinforcement.

[0006] Diaphragm wall cutters exert a vertical force on the soil, typically generated by their own weight. This so-called feed force is limited, on the one hand, by the maximum load capacity of the machine (carrier machine) to which the diaphragm wall cutter is suspended, and on the other hand, by the minimum feed force required to keep the diaphragm wall cutter vertical during operation. The operator must not exceed a maximum downward force, which is usually less than the weight of the cutter under buoyancy. This ensures that the diaphragm wall cutter will always realign itself vertically due to gravity if its longitudinal axis deviates slightly from the vertical. These principles also apply to diaphragm wall grabs.

[0007] To increase the feed force (for example, when creating trenches in hard subsoil), it is known in the art to equip trench cutters with clamping devices to wedge them in the ground during trench creation. A feed mechanism generates a downward force (feed force) in the clamped state, which exceeds the weight of the trench cutter under buoyancy. The clamping devices typically comprise outwardly extendable clamping elements that are pressed against the inner walls of the trench to clamp the trench cutter. In known devices, the clamping elements are arranged on the long sides of the usually box-shaped cutter frame.

[0008] Clamping the diaphragm wall cutter to the surrounding soil in the trench presents several problems and challenges. The surrounding soil must be sufficiently load-bearing to withstand the lateral clamping forces exerted by the clamping elements. These forces can cause permanent deformation of the soil. The extent of this deformation can be difficult to predict. For example, if there are small distances to existing structures such as foundations or underground transport infrastructure, the resulting deformation can negatively impact their stability. Furthermore, this deformation increases the required volume of concrete for the diaphragm wall panels, thus increasing material costs.Finally, the varying thickness of the diaphragm wall panels associated with the aforementioned deformation can represent a quality-reducing criterion, especially if the wall panels are visible in the finished building.

[0009] The object of the present invention is therefore to advantageously further develop soil cultivation equipment and methods of this type and to overcome the aforementioned disadvantages. In particular, it aims to enable the effective and simultaneously soil-friendly construction of diaphragm walls.

[0010] According to the invention, this problem is solved by a soil cultivation implement with the features of claim 1 and by a method with the features of claim 15. Advantageous embodiments of the invention are described in the dependent claims and the following description.

[0011] The soil cultivation device proposed according to the invention for creating a trench comprises a frame extending along a longitudinal axis, which has a rectangular cross-section transverse to the longitudinal axis. In a state freely suspended from a working machine, the longitudinal axis can run vertically. Within the trench, the longitudinal axis can assume an angle to the vertical, particularly if the soil cultivation device is unintentionally or intentionally inclined. The soil cultivation device can be connected to a working machine and can, for example, be suspended by a cable from the boom of a cable excavator or mobile crane. The soil cultivation device is, in particular, a trench cutter, but can also be designed, for example, as a trench grab.

[0012] The soil cultivation implement further comprises a soil cultivation tool arranged on a lower section of the frame, which may, for example, include one or more milling wheels or a grab, as well as a clamping device with at least two clamping elements arranged on opposite sides of the frame. The latter can be actively adjusted relative to the frame, in particular extended and retracted, in order to press the clamping elements against the inner walls of a soil trench and thus clamp or anchor the frame in the soil.

[0013] The soil cultivation implement further comprises a feed device for generating a feed force on the soil cultivation tool within a soil slot, by means of which the clamping elements and the frame are actively adjustable relative to each other along the longitudinal axis. If the frame is clamped in the soil slot via the clamping device, a feed force can be selectively generated via the feed device that exceeds the weight force resulting from the soil cultivation implement's own weight, thereby enabling effective soil slot creation in hard subsoil or in the production of secondary lamellae, which requires the partial removal of adjacent primary lamellae.

[0014] According to the invention, the clamping elements are arranged on the short sides of the frame. These are the sides of the frame that face the adjacent diaphragm wall panels during the construction of a diaphragm wall. The advance of the soil cultivation tool, which is located below the clamping device, creates a defined surface on the short sides of the trench. If the clamping of the soil cultivation tool in the currently created trench causes deformations in the adjacent soil, these deformations occur in the area of ​​the diaphragm wall being constructed. This minimizes the impact of the construction process on the soil bordering the diaphragm wall.

[0015] The arrangement of the clamping elements according to the invention on the short sides of the frame is particularly advantageous in the production of diaphragm walls using a step-by-step process, and especially in the creation of trenches for secondary lamellae. Here, the short sides of the currently created trench are formed by the adjacent primary lamellae. Since these are already hardened, they can withstand a greater load for clamping the soil cultivation equipment than the surrounding soil bordering the long sides of the frame. The clamping elements find defined and reliable clamping partners in the primary lamellae.

[0016] By clamping the frame between adjacent primary lamellae, an additional feed force can be applied effectively and gently via the feed mechanism. This additional feed force is particularly advantageous in very hard soils when using round-shank chisel milling wheels or roller-bit milling wheels. Especially when constructing a shaft, the secondary lamellae are usually manufactured at a certain angle to the primary lamellae. As a result, the soil cultivation tool often encounters inconsistent conditions in the soil. The resulting forces can vary considerably over time – even abruptly. This creates forces on the soil cultivation tool that can significantly affect its position in space.

[0017] The clamping mechanism, which secures the frame to the primary lamellae, ensures smooth guidance of the soil cultivation tool, such as the milling wheels on a trench cutter. This results in less jerky movement of the soil cultivation implement (particularly important when milling with a trench cutter). The positive locking mechanism within the trench improves the vertical guidance of the frame, allowing for better observation and control (and, if necessary, corrective adjustment) of the trench's vertical path.

[0018] The clamping elements can include a contact plate whose outer surface, when clamped, contacts an inner wall of the floor slot. The contact plates can have protrusions such as ridges, teeth, or the like to achieve a more stable contact with the inner walls of the floor slot.

[0019] The verticality of the soil cultivation implement can preferably be controlled during clamping by optional control flaps mounted on the frame, which are known per se.

[0020] In one possible embodiment, no clamping elements are arranged on the long sides of the frame. All clamping elements of the soil cultivation device are arranged on the short sides of the frame.

[0021] In another possible embodiment, the clamping device comprises at least one clamping actuator by means of which the clamping elements can be actively adjusted relative to the frame. The at least one clamping actuator is preferably designed as a hydraulic cylinder. It is conceivable that opposing clamping elements could be adjusted via a common clamping actuator. However, a preferred embodiment is one in which each clamping element is adjustable via at least one separate clamping actuator, which is connected on one side to the corresponding clamping element and on the other side to the frame. The clamping actuator can be pivotally connected to the clamping element and the frame.

[0022] In another possible embodiment, the clamping elements are adjustable transversely to the longitudinal axis. To clamp against the inner walls of the floor slot, the clamping elements are extended laterally. Alternatively or additionally, the clamping elements can be linearly adjustable, i.e., extendable and retractable linearly. Extension and retraction are effected, in particular, by at least one, preferably several, hydraulic cylinders (clamping actuators).

[0023] In another possible embodiment, the clamping elements are actively adjustable in their orientation relative to the longitudinal axis in order to influence the alignment of the soil cultivation implement relative to the soil slot. In other words, the angular position of the clamping elements relative to the longitudinal axis can preferably be changed to alter the alignment of the entire soil cultivation implement within the soil slot. This may be necessary, for example, to correct a deviation from the vertical or to deliberately create a deviation from the vertical.

[0024] In a preferred embodiment, to actively adjust the orientation of the clamping elements relative to the longitudinal axis, each clamping element can be adjusted via at least two clamping actuators (e.g., a first and a second hydraulic cylinder). The angular position of each clamping element can be changed by selectively controlling the clamping actuators.

[0025] In another possible embodiment, the feed mechanism comprises at least one feed actuator by means of which the frame, in a state clamped by the clamping elements in the base slot, can be displaced relative to the clamping elements. The at least one feed actuator is preferably designed as a hydraulic cylinder. The at least one feed actuator can always be aligned parallel to the longitudinal axis of the frame.

[0026] The soil cultivation implement specifically lacks an intermediate frame on which the clamping elements are arranged and which, together with them, is clamped in the soil slot, with the remaining frame, including the soil cultivation tool, being adjustable relative to the clamped intermediate frame via the feed system. Instead, the clamping elements are adjustable, and in particular slidable, parallel to the longitudinal axis and mounted on the frame, so that, in the clamped state, the entire frame of the soil cultivation implement can be moved relative to the clamping elements by means of the at least one feed actuator to generate the desired feed force. This results in a more compact design than a solution requiring an additional intermediate frame.

[0027] In principle, it is conceivable that the frame is moved relative to the clamped elements by a single feed actuator. However, a preferred embodiment is one in which each clamping element is connected to the frame via a separate feed actuator, in particular by a hinge connection, and the frame is moved by actuating all feed actuators connected to the respective clamped elements.

[0028] Preferably, the at least one feed actuator is arranged completely within the frame. This provides better protection for the feed mechanism against damage and stress.

[0029] In another possible embodiment, the frame has a modular structure and comprises a lower frame part, an upper frame part, and a middle frame part installed between the lower and upper frame parts.

[0030] In this setup, the soil cultivation tool is arranged on the lower frame section. If the soil cultivation implement is a trench cutter and the soil cultivation tool comprises one or more milling wheels, the lower frame section can include at least one drive unit and / or at least one gearbox unit by means of which the at least one milling wheel can be driven. Furthermore, the lower frame section can include at least one suction opening and an associated feed pump for conveying excavated material produced by the soil cultivation tool. The at least one suction opening can be located on a suction box formed between pairs of milling wheels.

[0031] The upper frame section can be connected to a working machine and may include a connecting element on its upper side, to which, for example, a lifting cable of a working machine can be attached to suspend the soil cultivation implement from a boom of the working machine. Alternatively or additionally, the upper section may have connections for hydraulic and / or electrical lines.

[0032] The frame sections are detachably connected to one another via connecting elements (e.g., bolted connections), with the upper and lower frame sections preferably being detachably connected both directly and via the intermediate middle frame section. Thus, the middle frame section can optionally be installed between the upper and lower frame sections, thereby increasing the overall length of the frame or the tillage implement. Alternatively, the middle frame section can be removed, and the upper and lower frame sections can be connected directly, resulting in a shorter frame or a tillage implement of reduced length. The components of the tillage implement essential for operation are therefore preferably located not in the middle frame section, but in the lower and, if necessary, also in the upper frame section.

[0033] The frame of the soil cultivation implement can have a modular design, as disclosed in EP 3 683 361 A1. Explicit reference is made to this teaching.

[0034] In another possible embodiment, the central frame section comprises the clamping device, i.e., the clamping elements are arranged on the short sides of the central frame section. Alternatively or additionally, the central frame section can comprise the feed device. Preferably, both the clamping device and the feed device are completely housed in or on the central frame section. Preferably, the central frame section can also include the clamping and feed actuators, and in particular, corresponding hydraulic lines and, optionally, other hydraulic components.

[0035] This makes it advantageously possible to retrofit and dismantle the clamping and feed system according to the invention. Depending on the application or soil conditions, a different central frame section without the clamping and / or feed device can be installed instead of the central frame section with these devices (or the soil cultivation implement can be used without a central frame section). Instead of having to keep several different soil cultivation implements (e.g., several trench cutters), a single implement with one, two, or more different central frame sections can be used, which reduces investment costs.

[0036] As previously explained, using the central frame section with integrated clamping and / or feed mechanism improves the quality of soil trench construction, as drift of the tillage implement perpendicular to the trench wall plane can be better detected and thus reduced. Furthermore, the degree of overlap with primary lamellae can be better controlled and influenced with the central frame section installed. This reduces the risk of excessive damage / wear to the tillage tool from the reinforcing steel.

[0037] In another possible embodiment, the clamping device comprises at least two clamping elements on each of the short sides of the frame. These can be arranged one above the other on each side. The clamping device can therefore comprise a total of at least four clamping elements. The clamping elements are preferably actuated alternately via the feed mechanism such that a feed force can be generated by first feed actuators through clamping via a first opposing pair of clamping elements (e.g., the upper clamping elements), while a second opposing pair of clamping elements (e.g., the lower clamping elements) is moved freely relative to the frame by means of second feed actuators. This allows a continuous feed force to be generated along the longitudinal axis, since the clamping elements on each side are actuated alternately, and thus one clamping element is active at a time ("milking motion").

[0038] Each clamping element is preferably connected to the frame via a feed actuator. To generate a feed force, the feed actuators of the clamped clamping elements can be extended (the soil cultivation tool is pressed downwards), while the "inactive" clamping elements are moved into position for the next clamping phase by retracting feed actuators. This process is then repeated for the other pairs of clamping elements.

[0039] In another possible embodiment, the clamping elements are adjustable via separate clamping actuators and are slidably mounted directly or indirectly in guide elements of the frame that run parallel to the longitudinal axis. The clamping actuators preferably bear directly or indirectly against the guide elements to press the clamping elements against the inner walls of the bottom slot. This results in a compact design and simultaneously provides defined guidance of the clamping elements and / or the frame relative to the clamped elements.

[0040] In another possible embodiment, slides are slidably mounted in the aforementioned guide elements, and the clamping actuators are connected to these slides, in particular by pivoting links, in order to be supported against them and thereby generate the lateral clamping forces. Preferably, the feed actuators are connected to the slides, in particular by pivoting links.

[0041] The invention further relates to a working machine with a soil cultivation implement according to the invention. The working machine can be a cable excavator, but also, for example, a mobile crane or hydraulic excavator. The working machine can comprise a mobile undercarriage, for example with crawler tracks, and a superstructure rotatably mounted on the undercarriage about a vertical axis, with a swiveling boom. The soil cultivation implement can be suspended from the working machine by a support cable, which is guided, for example, via one or more pulleys at the end of the boom to a support cable winch on the superstructure. The soil cultivation implement is preferably a trench cutter.

[0042] The invention further relates to a set comprising a soil cultivation implement according to the invention, the frame of which has a modular structure as described above, and at least one further middle frame section, which can optionally be installed between the upper and lower frame sections instead of the middle frame section comprising the clamping and / or feed device. The properties and advantages described above in this respect result. At least one further middle frame section may not include a clamping device or a feed device. Alternatively or additionally, at least one further middle frame section may have a differently designed clamping device, e.g., with two clamping elements on each side instead of just one clamping element on each side, or with a design for higher / lower feed forces.

[0043] The invention further relates to a method for creating a trench using a soil cultivation device according to the invention. The soil cultivation device is preferably designed as a trench cutter. In this method, two spaced-apart trench wall panels (primary panels) are first produced. This is done, in particular, by creating two trenches with the same soil cultivation device and subsequently filling them with concrete. Reinforcing cages can be used for this purpose. The distance between the primary panels is preferably selected to be smaller than the width of the secondary panel to be produced between them along its long side. This necessitates the removal, in particular milling, of a portion of the primary panels to produce the secondary panel.

[0044] Subsequently, particularly after the concrete of the primary lamellae has cured, a soil trench connecting the primary lamellae is created between them using the soil cultivation equipment by milling or excavation. Preferably, the overlapping edge sections of the primary lamellae are also milled away. During the creation of the soil trench, a feed force is generated by the feed device, while the clamping elements of the clamping device are supported against the adjacent diaphragm wall lamellae. This is possible because these elements are located on the short sides of the soil cultivation equipment frame facing the milled sides of the primary lamellae, and not on the long sides of the frame facing the soil.

[0045] The clamping force exerted by the clamping elements (generated by at least one clamping actuator) can preferably be controlled independently of the feed force (generated by at least one feed actuator). For this purpose, the soil cultivation implement preferably includes at least one control unit that controls the aforementioned actuators.

[0046] Further features, details and advantages of the invention will become apparent from the exemplary embodiment explained below with reference to the figures. The figures show: Figure 1: a schematic top view of a soil slot arranged between two primary lamellae for a secondary lamella; Figure 2: a top view of an embodiment of the soil cultivation device according to the invention within the soil slot. Figure 1 Figure 3: a side sectional view through the soil cultivation implement according to Figure 2Figure 4: an enlarged representation of the clamping and feed device of the soil cultivation implement in a side sectional view; and Figure 5: the clamping and feed device with the frame moved downwards.

[0047] The Figure 1 Figure 1 shows a schematic top view of a bottom slot 2, which is arranged between two previously manufactured primary lamellae 1, and has already been explained in the introductory description. The overlap areas 3 are visible, resulting from the fact that the primary lamellae 1 are arranged at an angle to the bottom slot 2 and also have a smaller distance between them than the width of the bottom slot 2.

[0048] The Figures 2-5 show a preferred embodiment of the soil cultivation device 10 according to the invention, which here is designed as a slurry wall cutter and is arranged within a soil slit 2 in accordance with Figure 1The invention is located, however, and is not limited to diaphragm wall milling machines and the illustrated arrangement of diaphragm wall panels, and could, for example, also be used in diaphragm wall grabs.

[0049] The Figure 2 shows a top view of the diaphragm wall cutter 10, while the Figure 3 a lateral sectional view along the in the Figure 2 The dashed line shows the position of the slot wall cutter 10. It has a frame 14 (also called a milling frame) which has a box-shaped structure with a top view (i.e., perpendicular to its longitudinal axis, cf. Fig. 3The frame 10 has a rectangular cross-section and carries a soil cultivation tool 15 at its lower end. In the embodiment shown here, this tool comprises several milling wheels 16, for example, two pairs of milling wheels 16 arranged side by side. These can be driven by gear plates located on the underside of the frame 14. The diaphragm wall cutter 10 can be attached to a working machine, for example, to the boom of a cable excavator (not shown), via a support cable (not shown), and can be raised and lowered by means of this cable.

[0050] As in the Figures 1 and 2 As can be seen, to create the bottom slot 2 for the secondary lamella to be produced, the end sections of the primary lamellae 1 that overlap with the bottom slot 2 are milled off, resulting in two flat side walls facing the short sides 14a of the frame 14, which form stable, load-bearing inner walls of the bottom slot 2. Figure 3 The longitudinal axis 19 of the diaphragm wall cutter 10 is shown, which runs vertically in the freely suspended state or when creating a vertical floor slot 2.

[0051] The slot wall milling machine 10 has a clamping device 20 and a feed device 30, which interact in such a way that a feed force can be generated within the bore slot 2, which acts on the milling tool 15 and thereby supports the milling of the bottom slot 2 and the edge areas of the primary lamellae 1. The clamping device 20 and the feed device 30 are in the Figures 4-5 A more detailed explanation.

[0052] The clamping device 20 comprises several clamping elements 22 (in the illustrated embodiment, one clamping element 22 per side, although two clamping elements 22 per side would also be conceivable) arranged on the short sides of the frame 14. Preferably, there are no clamping elements on the long sides 14b of the frame 14. In this embodiment, the clamping elements 22 are designed as contact plates that can be moved laterally outwards, i.e., extended, by means of clamping actuators 24. The extension preferably occurs linearly and, in particular, perpendicular to the longitudinal axis 19. The clamping actuators 24 are, in particular, designed as hydraulic cylinders (clamping cylinders) that push the clamping elements 22 outwards by extending the piston rods. Two clamping actuators 24 can be provided per clamping element 22.

[0053] By extending the clamping elements 22, they can be pressed against the inner walls of the floor slot 2, thereby clamping the frame 14 in the floor slot 2. In the application shown, the clamping elements 22 are pressed against the milled walls of the adjacent primary lamellae 1, which provide load-bearing, stable clamping partners. This prevents deformation of the surrounding soil 4 and avoids the disadvantages described in the introduction.

[0054] The clamping elements 22 are slidably mounted on the frame 14 parallel to the longitudinal axis 19 and connected to the frame 14 via feed actuators 32 of the feed system 30. The feed actuators 32 can be designed as hydraulic cylinders (feed cylinders). In the clamped state, the entire frame 14 can be pushed downwards towards the slot bottom by actuating the feed actuators 32, thereby generating the feed force. Subsequently, the clamping elements 22 are retracted, the feed actuators 32 are moved to their starting position, and the process begins again.

[0055] The frame 14 can, as shown in the embodiment of the Figures 4-5The illustration shows two guide elements 35 or guide rails extending parallel to the longitudinal axis 19, on or in which a slide 36 is slidably mounted. The clamping actuators 24 can be supported on the slide 36 and thus on the guide elements 35 (and therefore simultaneously on the frame 14) to generate the necessary clamping force to press the clamping elements 22 against the inner walls of the bottom slot 2. The feed actuators 32 can be connected to the slides 36 and to the frame 14. In the illustrated embodiment, the feed actuators 32 are always aligned parallel to the longitudinal axis 19 and pivotally connected to first connecting elements 34 of the frame 14 and pivotally connected to second connecting elements 37 of the slides 36.

[0056] The Figure 5 Figure 1 shows the clamping elements 22 in the clamped state, with the feed actuators 32 retracted. By extending the feed actuators 32 (see Figure 2), the clamping elements 22 are clamped in the clamped state with the feed actuators 32 retracted. Fig. 4The frame 14 is moved downwards. During this movement, the carriages 36 move upwards along the guide elements 35. The guide elements 35 can have lower and upper mechanical stops for the carriages 36 to limit the travel distance.

[0057] In the illustrated embodiment, the slides 36 and the feed actuators 32 are arranged completely within the frame 14 and are thus protected from the harsh conditions in the bottom slot.

[0058] As in the Figure 3As indicated, the frame 14 can have a modular design and, for example, comprise a lower frame section 11, a middle frame section 12, and an upper frame section 13, which are detachably connected to one another by connecting elements not shown in detail. The lower frame section carries the milling wheels 16 and can, for example, include gear shields, a suction box with suction openings, and a feed pump. The upper frame section 13 can include a retaining element for connecting to a support cable of a working machine.

[0059] Preferably, all components of the clamping device 20 and the feed device 30 are arranged in or on the central frame part 12 (see figure). Figs. 4-5This makes it possible to operate the slot wall cutter 10 without the clamping and feed device 20, 30 if required, and to remove the middle frame section 12 (in this case, either another middle frame section can be installed as an extension or with a different function, or the lower and upper frame sections 11, 13 can be directly connected to each other). Alternatively, the clamping and feed devices 20, 30 could be arranged in the lower frame section 11, in the upper frame section 13, or distributed across several frame sections 11, 12, 13.

[0060] Preferably, each clamping element 22 can be actuated via at least two clamping actuators 24, so that the clamping elements 22 can be changed in their orientation relative to the frame 14. This advantageously allows the orientation of the diaphragm wall cutter 10 and the resulting feed direction of the feed actuators 32 to be set independently of the verticality of the clamping partner (soil 4, primary lamellae 1).

[0061] The diaphragm wall cutter 10 can optionally have additional control flaps to influence the inclination of the diaphragm wall cutter 10. These can be arranged on the long and / or the short sides 14a, 14b of the frame 14. Reference symbol list:

[0062] 1 Primary lamella 2 Soil slot 3 Overlap area between soil slot and primary lamella 4 Soil 10 Soil cultivation device (slot cutter) 11 Lower frame part 12 Middle frame part 13 Upper frame part 14 Frame 14a Short side 14b Long side 15 Soil cultivation tool 16 Milling wheel 19 Longitudinal axis 20 Clamping device 22 Clamping element 24 Clamping actuator 30 Feed device 32 Feed actuator 34 First connecting element 35 Guide element 36 Slide 37 Second connecting element

Claims

1. Soil cultivation device (10), in particular a trench cutter, for creating a soil trench (2), which can be connected to a working machine, comprising a frame (14) extending along a longitudinal axis (19) which has a rectangular cross-section transverse to the longitudinal axis (19), a soil cultivation tool (15) arranged on a lower section of the frame (14), a clamping device (20) with at least two clamping elements (22) arranged on opposite sides of the frame (14), which are actively adjustable relative to the frame (14) in order to press the clamping elements (22) against the inner walls of a soil trench (2), and a feed device (30) for generating a feed force on the soil cultivation tool (10) within a soil trench (2), by means of which the clamping elements (22) and the frame (14) are actively adjustable relative to each other along the longitudinal axis (19), characterized by thatthe clamping elements (22) are arranged on the short sides (14a) of the frame (14).

2. Soil cultivation device (10) according to claim 1, wherein no clamping elements (22) are arranged on the long sides (14a) of the frame (14).

3. Soil cultivation device (10) according to claim 1 or 2, wherein the clamping device (20) comprises at least one clamping actuator (24) in particular designed as a hydraulic cylinder, by means of which the clamping elements (22) are actively adjustable relative to the frame (14), wherein preferably each clamping element (22) is adjustable via at least one separate clamping actuator (24) which is connected to the associated clamping element (22) and to the frame (14), in particular by means of a pivot connection.

4. Soil cultivation device (10) according to one of the preceding claims, wherein the clamping elements (22) are adjustable transversely to the longitudinal axis (19) and / or linearly.

5. Soil cultivation device (10) according to one of the preceding claims, wherein the clamping elements (22) are actively adjustable in their orientation relative to the longitudinal axis (19) in order to influence the alignment of the soil cultivation device (10) relative to the soil slot (2).

6. Soil cultivation device (10) according to one of the preceding claims, wherein the feed mechanism (30) comprises at least one feed actuator (32) in particular designed as a hydraulic cylinder, by means of which the frame (14) is displaceable relative to the clamping elements (22) in a state clamped via the clamping elements (22) within a soil slot (2), wherein preferably each clamping element (22) is connected to the frame (14) via a separate feed actuator (32), in particular by pivot connection.

7. Soil cultivation implement (10) according to one of the preceding claims, wherein the frame (14) comprises a modular structure with a lower frame part (11) supporting the soil cultivation tool (15), an upper frame part (13) connectable to a working machine and a middle frame part (12) arranged between them, wherein the frame parts (11, 12, 13) are each detachably connectable to one another via connecting elements, wherein the upper and lower frame parts (11, 13) are preferably detachably connectable to one another both directly and via the middle frame part (12) which can be arranged between them.

8. Soil cultivation device (10) according to the preceding claim, wherein the middle frame part (12) comprises the clamping device (20) and / or the feed device (30).

9. Soil cultivation device (10) according to one of the preceding claims, wherein the clamping device (20) comprises at least two clamping elements (22) on each of the short sides of the frame (14), which are in particular arranged one above the other and which are preferably alternately actuated via the feed device (30) such that a feed force can be generated by means of first feed actuators (32) by means of a clamping via a first opposing pair of clamping elements (22), while a second opposing pair of clamping elements (22) is moved freely relative to the frame (14) by means of second feed actuators (32).

10. Soil cultivation device (10) according to one of the preceding claims, wherein the clamping elements (22) are adjustable via separate clamping actuators (24) and the clamping elements (22) are slidably mounted in guide elements (35) of the frame (14) running parallel to the longitudinal axis (19), wherein the clamping actuators (24) preferably bear against the guide elements (35) in order to press the clamping elements (22) against the inner walls of a soil slot (2).

11. Soil cultivation device (10) according to the preceding claim, wherein slides (36) are slidably mounted in the guide elements (35), with which the clamping actuators (24) and preferably also the feed actuators (32) are connected, in particular pivotally connected.

12. Soil cultivation device (10) according to one of the preceding claims, wherein the soil cultivation device (10) is designed as a diaphragm wall cutter and the soil cultivation tool (15) comprises at least one milling wheel (16).

13. Working machine, in particular cable excavator, with a soil cultivation device (10) according to one of the preceding claims, wherein the soil cultivation device (10) is preferably designed as a diaphragm wall cutter.

14. Set comprising a soil cultivation device (10) further developed at least according to claim 7 or 8, and at least one further middle frame part which can optionally be installed between the upper and lower frame parts (11, 13) instead of the middle frame part (12) comprising the clamping and / or feed device (20, 30), wherein preferably at least one further middle frame part has no clamping device or a differently designed clamping device.

15. Method for creating a soil trench using a soil cultivation device (10) according to one of the preceding claims, wherein the soil cultivation device (10) is preferably designed as a trench cutter, comprising the steps of: - creating two spaced-apart primary lamellae (1), in particular by filling two soil trenches created using the soil cultivation device (10) with concrete, wherein the distance between the primary lamellae (1) is preferably less than the width of the primary lamellae (1) along their long side;and - creating a soil slot (2) connecting the primary lamellae (1) by milling or excavating the space between the primary lamellae (1) using the soil cultivation device (10), preferably milling off edge sections of the diaphragm wall lamellae (1), wherein a feed force is generated by means of the feed device (30) when creating the soil slot (2), while the clamping elements (22) are supported on the adjacent primary lamellae (1).

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