Milling cutter for molded wall

Abstract

The invention relates to a diaphragm wall milling cutter that can be connected to a support device and comprises a milling frame and at least one milling tool arranged on the milling frame for grinding soil materials, including one or more milling wheels. According to the invention, the diaphragm wall milling cutter also comprises a support frame connected to the milling frame and at least two ballast elements that can be removably mounted on or within the support frame. The invention also relates to a support device with a diaphragm wall milling cutter according to the invention.

Description

Title of the invention: Milling cutter for molded wall

[0001] The present invention relates to a milling cutter for a diaphragm wall and a carrier device, in particular a cable shovel, with such a milling cutter.

[0002] Diaphragm wall cutters are used to create floor slots for the construction of diaphragm walls in a wide variety of building projects and are available in different finishes and sizes. They are generally mounted on mobile support equipment such as mobile cranes or cable excavators.

[0003] During their operation, diaphragm wall cutters encounter a wide variety of soil types and environmental conditions. To achieve optimal performance under all circumstances, diaphragm wall cutters must be adaptable to the respective conditions. An important factor is the load applied to the cutter wheels of the diaphragm wall cutter during operation. For particularly hard soils, a high load is reasonable, whereas it can even be problematic on softer soil types. It is therefore necessary to be able to adapt the mass of the diaphragm wall cutter to the type of soil encountered. This can be done, for example, by equipping it with additional ballast.

[0004] Furthermore, general technical conditions may play a role here. For example, the maximum payload of the conveying unit must not be exceeded. Depending on the carrier and the equipment configuration of the molding cutter, the total mass must also be adjustable within a limited range to optimize system operation.

[0005] The prior art provides specially shaped ballast plates for ballasting such milling systems, which are adapted to specific recesses in the frame. These plates can therefore only be fixed in a few places and thus offer little flexibility when varying the additional mass. Furthermore, the individual ballast plates often cannot be fixed in line with the center of gravity of the molding cutter. In this case, they must be installed in pairs to balance themselves so that the molding cutter does not become unbalanced.

[0006] The aim of the present invention is therefore to develop molded wall cutters of the type mentioned at the beginning, in an advantageous manner and to overcome the aforementioned drawbacks. More specifically, it must be possible to adapt the total mass of the molded wall cutter safely and easily to the respective prevailing environmental and operational conditions.

[0007] According to the invention, this objective is achieved by a milling cutter for diaphragm walls according to the invention, which can be attached to a carrying device such as a cable excavator and comprises a milling frame and at least one milling tool for grinding soil materials, including one or more milling wheels.

[0008] According to the invention, the molded wall cutter further comprises a support frame attached to the cutter frame and at least two ballast elements that are removably arranged on or within the support frame. In other words, the ballast elements can be placed in the support frame to increase the load and removed to reduce the load.

[0009] The central idea of ​​the present invention is therefore to provide a support frame suitable for attaching the ballast elements, which is itself attached to the cutter frame. The ballast elements are fixed or removably arranged within the support frame, allowing for a flexible and space-saving arrangement that is optimized with regard to the positions of their respective centers of gravity. The support frame serves to receive the ballast elements and to transmit the gravitational forces to the cutter frame or the molded wall cutter.

[0010] The support frame can be optimized or designed for receiving and securing the ballast elements and can enable, for example, a modular ballast system. Depending on the shape and arrangement of the support frame, securing or removing the ballast elements can be considerably simplified.

[0011] The term support frame should be interpreted broadly and does not necessarily have to include an actual frame or support structure. It should be understood to mean any type of device or structure suitable for receiving and, where appropriate, securing several ballast elements. The support frame may be a separate device or structure and should not be confused with the cutter frame.

[0012] Advantageous embodiments of the invention result from the dependent claims and the following description.

[0013] In one possible embodiment, the support frame is arranged on or within the cutter frame so that the ballast elements mounted or inserted into it are arranged one above the other when the diaphragm wall cutter is in a suspended or vertical position. More specifically, in the aforementioned state, the ballast elements are arranged along the longitudinal axis of the diaphragm wall cutter and / or along the longitudinal axis of the cutter frame. This means that the ballast elements are arranged side by side when the diaphragm wall cutter is resting on the ground.

[0014] For example, the ballast elements can be installed from bottom to top (when the molding cutter is in a vertical position) in order to keep the overall center of gravity as low as possible. In some cases, however, it may also be advantageous to position the ballast elements as high as possible in order to influence specifically the center of gravity of the milling cutter for diaphragm walls. The support frame and the ballast elements are designed in particular so that the ballast system has a modular structure and the user can therefore choose how to arrange the ballast elements in the support frame and thus in relation to the milling cutter frame.

[0015] In another possible embodiment, the support frame and the ballast elements are designed such that the position of the center of gravity of the ballast elements mounted in the support frame and the position of the center of gravity of the cutter frame coincide in plan view. In other words, the centers of gravity of the ballast elements used for ballasting are aligned forward and laterally with the center of gravity of the cutter frame. The position of the center of gravity of the cutter frame can coincide with the position of the overall center of gravity of the molded wall cutter in plan view. In this case, what has been said above also applies to the overall center of gravity of the molded wall cutter. However, the height of the overall center of gravity of the ballast system, and thus of that of the molded wall cutter, depends on the arrangement of the ballast elements.

[0016] Preferably, the position of the overall center of gravity of the molding cutter in a plan view is independent of the number and arrangement of the ballast elements mounted in the support frame. This means that the overall center of gravity of the molding cutter does not change in the horizontal plane (with the molding cutter in a vertical position) by adding or removing ballast elements. The position of the overall center of gravity, apart from its height, is not affected by any ballast configuration. Unlike known solutions, it is not necessary to consider how the ballast elements are arranged, and, if necessary, a paired arrangement can be chosen to avoid negatively influencing the overall center of gravity of the molding cutter or causing the molding cutter to tip.This not only increases safety, but also greatly simplifies the ballasting process.

[0017] In another possible embodiment, the support frame is arranged or mounted inside the cutter frame. Preferably, the support frame is located entirely inside the cutter frame and does not extend beyond the outer contour of the cutter frame. Consequently, it is ensured that the system consisting of the support frame and the ballast elements does not, under any circumstances, extend beyond the contours of the cutter frame. The maximum possible ballast therefore does not depend on the configuration of the molded wall cutter, in particular not with regard to its lateral widening. The outer contour of the molded wall cutter, in particular its lateral extension, is therefore independent of the ballast. Furthermore, the The support frame and ballast elements are protected inside the milling machine frame.

[0018] In another possible embodiment, the cutter frame is provided to have an opening, and the support frame is arranged so that the ballast elements can be inserted into and removed from the support frame through the opening. The opening may be located on a front side of the cutter frame and is preferably designed so that the support frame can be inserted into the cutter frame as a whole through the opening and removed from the outside. The dimensions of the opening are therefore at least as large as the dimensions of the support frame including the ballast elements. For faster disassembly, the support frame can be removed from the cutter with the ballast units mounted, for example, when it is removed. For this purpose, fastening elements such as lifting rings may be provided on the support frame.

[0019] In another possible embodiment, the support frame and / or the ballast elements are provided to include fastening means for removably attaching the ballast elements to or within the support frame. These fastening means may consist of simple bores and bolts for creating removable bolted assemblies or of elements for creating screwed assemblies. For example, bores may be provided on the support frame and / or the ballast elements through which screws can be passed and secured with nuts. Alternatively, the support frame may have threaded bores into which corresponding screws can be screwed directly. This makes attaching or detaching the ballast elements from the outside particularly easy.Of course, other fastening options are also possible, for example using snap-fit ​​or notched connections. These may include spring-loaded elements.

[0020] In another possible embodiment, the support frame is provided to include at least two recesses into each of which a ballast element can be inserted and, preferably, mounted removably. Preferably, a large number of recesses and suitable ballast elements are provided so that the ballast elements can be flexibly arranged within the support frame. The support frame and the ballast elements can constitute a modular ballast system that allows for particularly flexible handling and arrangement of the ballast of the molding cutter. Such a modular ballast system allows for precise adaptation of the total mass of the molding cutter to environmental conditions.

[0021] Preferably, the housings and ballast elements are designed to be identical. However, it is also conceivable that several housings of different sizes and corresponding ballast elements of different sizes may be provided, with at least two housings and ballast elements preferably being provided for each size.

[0022] In another possible embodiment, the housings are provided that each includes at least one receiving plate and / or rail onto which the ballast elements can be placed and / or inserted. The storage plates do not need to be continuous but can, for example, run along the side and rear walls of the support frame. The storage plates serve to receive the gravitational forces of the ballast elements and transfer them into the support frame. Thus, the ballast elements only need to be protected against falling from the support frame, which can be done in a readily accessible manner directly on the front side of the support frame. These storage plates also allow, if necessary, the ballast units to be inserted and mounted in the vertical position of the molded wall cutter.

[0023] In another possible embodiment, the support frame is removably connected to the cutter frame and includes lifting elements for attaching a lifting winch. The support frame can thus be removed from or entirely reattached to the cutter frame. This allows not only the introduction of individual ballast elements into the cutter frame when the molded wall cutter is mounted or removed, but also the entire ballast system, including the support frame and the ballast elements, can be installed in or removed from the cutter frame. This can simplify or expedite the ballasting process. The lifting elements can be lifting shackles or simple bores to which a lifting device, such as a cable or crane chain, is attached for lifting the support frame.

[0024] In another possible embodiment, the milling cutter frame is provided to comprise at least two frame parts that can be removably connected to each other, said at least one milling wheel being preferably arranged on a first frame part and the support frame on or in a second frame part. More than two frame parts may be provided, which constitute a modular frame system for forming the milling cutter frame. The support frame may be arranged in a central frame part, which may be removable from the milling cutter frame. This makes it possible to design a molded wall cutter without this central frame part and therefore without additional ballast, resulting in a lower height and weight. This can be advantageous in certain cases, for example in space-constrained situations, since it allows for a cutter design for shorter molded wall. In this case, only subordinate components, such as conduits passing through the central part of the frame, need to be adjusted, etc., which represents a relatively small effort. The modular structure of the milling machine frame can correspond to a structure described in DE 10 2019 101 305 A1, the content of which is explicitly included in this disclosure.

[0025] In another possible embodiment, the ballast elements are provided to include slinging elements for attaching a winch slinging means. The support frame is specifically designed so that the ballast elements can be mounted particularly easily when the diaphragm wall cutter is in a horizontal position. They can, for example, be lowered into the support frame using a suitable crane and then secured there. For this purpose, slinging elements are provided for the ballast elements, for example, simple bores or lifting straps. However, it is also preferably possible to lower or install the ballast elements into the support frame when the diaphragm wall cutter is in a vertical position.

[0026] In another possible embodiment, the support frame is provided to include at least one recess for rinsing with a liquid, preferably at least one recess being located on a rear wall and / or an underside of the support frame. This at least one recess allows for easy cleaning of the ballast system. The deposited bentonite can be flushed back and forth between the ballast elements. The support frame preferably includes a plurality of recesses, for example on a rear wall and / or an upper and / or lower side.

[0027] The invention also relates to a carrier device with a diaphragm wall cutter. The carrier device may, in particular, be a cable excavator, but also a mobile crane or a hydraulic excavator. The carrier device preferably comprises a mobile undercarriage, for example with a tracked chassis, and a turret mounted on the undercarriage so as to be able to rotate about a vertical axis and which is provided with a pivoting boom. The diaphragm wall cutter is suspended from the carrier device by means of a rope that passes through one or more pulleys at the end of the boom to a winch on the superstructure.

[0028] Other features, details, and advantages of the invention will be apparent from the embodiment explained below with reference to the drawings. These depict:

[0029] [Fig. 1] The molded wall cutter according to the invention in a front view schematic;

[0030] [Fig.2] the support chassis equipped with ballast elements in a view in perspective ;

[0031] [Fig.3] a single ballast element in a perspective view;

[0032] [Fig.4] the support frame according to [Fig.2] without ballast elements;

[0033] [Fig.5] A perspective view of the support frame with the molded wall cutter placed on the ground, with only a central portion of the milling machine frame shown;

[0034] [Fig.6] a side view of the support chassis being lifted by a crane.

[0035] In [Fig. 1], an example of an embodiment of the molded wall cutter 10 according to The invention is shown in a front view. The diaphragm wall cutter 10 shown in this embodiment comprises a cutter frame 12 having a first frame section or lower frame section 17, a second frame section or central frame section 18, and a third frame section or upper frame section 19. At the lower end of the lower frame section 17, there are two milling wheels 14 (= milling tools), which are shown schematically here only, and which are intended for grinding soil material when creating a groove in the floor. The diaphragm wall cutter 10 is suspended, by means of the upper frame section 19, from a support device not shown further.The central chassis part 18, located between the lower and upper chassis parts 17, 19, includes the ballast system according to the invention, which comprises a support chassis 20 and ballast elements 40 arranged inside the milling cutter chassis 12.

[0036] The frame sections 17, 18, 19 can preferably be removably connected to one another to form a modular cutter frame 12, the central frame section 18 preferably being removable to form a molded wall cutter with a reduced structural height and weight. However, such a modular design is not a prerequisite for the present invention. Thus, alternatively, the cutter frame 12 could consist of a single continuous frame, or could have another configuration or arrangement of frame elements.

[0037] The cutter frame 12 includes an internal space in which the support frame 20 is located. Thus, the support frame 20 is entirely disposed within the cutter frame 12 and does not protrude from the outer contour of the cutter frame 12, even when it is fully equipped with ballast elements 40. On the front face of the cutter frame 12 (or of the central frame portion 18), there is a substantially rectangular opening 16 through which the support frame 20 and the ballast elements 40 placed thereon are accessible from outside the molded wall cutter 10. The front face of the support frame 20, from which the ballast elements 40 are inserted, faces the opening 16 and is covered by it.

[0038] The support frame 20 is shown in [Fig. 2] in a state fully equipped with ballast elements 40, while the support frame 20 without ballast elements 40 is shown in [Fig. 4]. A single ballast element 40 is shown in [Fig. 3].

[0039] The support frame 20 has a cabinet-like or box-like structure with two flat side walls 21, and upper and lower parts 24 connecting the side walls to each other (see [Fig. 4]). The support frame 20 includes a plurality of housings for the ballast elements 40, which are formed by receiving plates 26 arranged one above the other, i.e., along the longitudinal axis of the support frame 20. The receiving plates 26, in the vertical position of the molded wall cutter 10, constitute receiving surfaces for the ballast elements 40 but do not need to be formed from sheet metal. Projections, rails, or other inwardly extending features, on which the ballast elements 40 can be placed and which receive their loads, are also suitable for this purpose.

[0040] The ballast elements 40 are of identical design and can be inserted into each of the slots in the support frame 20. For this purpose, a ballast element 40 is pushed onto the appropriate receiving plate 26. In a vertical position of the molded wall cutter 10, the ballast elements 40 can simply be lowered into the spaces between the receiving plates 26 (see [Fig. 5]).

[0041] The support frame 20 is arranged inside the cutter frame 12 such that the ballast elements 40 mounted therein are arranged one above the other along the longitudinal axis of the cutter frame 12 or the molded wall cutter 10. The centers of gravity of the various ballast elements 40 are aligned from the front and side with the center of gravity of the cutter frame 12, that is to say, in particular, with the overall center of gravity of the molded wall cutter 10, with or without ballast. In other words, in a top view of the support frame 20, the centers of gravity of the ballast elements 40 mounted in the support frame 20 coincide with the center of gravity of the cutter frame 12 and, in particular, with the center of gravity of the molded wall cutter 10.

[0042] Consequently, the overall center of gravity of the molding cutter 10 does not change when it is loaded with ballast elements 40; that is, in no state does the position of the overall center of gravity, apart from its height, depend on the ballast. Rather, the overall center of gravity depends on the arrangement and number of ballast elements 40 mounted in the support frame 20. Furthermore, the overall center of gravity of the molding cutter 10 preferably does not change even if the entire support frame 20 is removed. The above explanations refer to the position of the overall center of gravity in a top view, but not to the height of the overall center of gravity. This depends of course on the exact arrangement of the ballast elements 40.

[0043] The ballast elements 40 can be reasonably inserted from bottom to top to maintain the lowest possible center of gravity. In some cases, however, it may be advantageous to position the ballast elements 40 as high as possible to specifically influence the center of gravity. The user is free to choose this option due to the modular structure of the ballast system according to the invention.

[0044] The ballast elements 40 can be fixed to the support frame 20 and can thus be protected against sliding outwards or falling. For this purpose, the side walls 21 of the support frame 20 include strip-shaped fixing sections 22 on the front end faces, which extend laterally from the side walls 21 or are curved outwards. On the fixing sections 22 are arranged fixing elements 30 in the form of threaded bores 30 which are arranged one below the other at the height of the housings, i.e. that a threaded bore 30 is provided for each housing and for each fixing section 22. The ballast elements 40 comprise laterally two bores 44 which cover two corresponding threaded bores 30 of the fixing sections 22 when they are inserted into the support frame 20. The ballast elements 40 can then be fixed or screwed to the support frame 20 (see [Fig.2]).Instead of tapped holes 30, standard holes can also be used, with the screws 32 secured, for example, by means of nuts. Other mounting options, such as using bolts, are also possible. However, screwing with tapped holes allows for particularly simple mounting / dismounting of the ballast elements 40 with easy access from one side only.

[0045] The ballast elements 40 have a flat, axisymmetric design (see [Fig. 3]) with two lateral wings on which the bores 44 are provided. Other shapes of the ballast elements 40 are also conceivable. The ballast elements 40 further include two lifting tabs 42 (= slinging elements) by which, via a slinging element 50, they can be lifted by means of a hoist, for example, an auxiliary crane (see [Fig. 5]).

[0046] The receiving plates 26 are not continuous but extend over the inner faces of the side walls 21 and the rear wall 23 of the support frame 20. Furthermore, several recesses 25 are provided on the rear wall 23 of the support frame 20 for the passage of liquid or for cleaning. Thus, for example, deposited bentonite can be expelled between the ballast elements 40 from front to back. The lower face 24 also includes a recess 25.

[0047] The support frame 20 is not fixed to the cutter frame 12, but can be installed in and removed from it. For this purpose, suitable connecting elements are used. are provided on the support frame 20 and inside the cutter frame 12. In order to allow the support frame 20 to be lifted by a crane, it includes lifting tabs 28 (= slinging elements) on its lower and upper faces, to which a slinging means 50 can be attached. Figure 6 shows the support frame 20 equipped with these tabs in a lifted position.

[0048] Figure 5 shows the molded wall cutter 10 in a resting position on the ground, alone The central part of the frame 18 with the support frame 20 is shown. One of the ballast elements 40 is attached to a crane hook by means of a lifting device 50 and is inserted into one of the slots in the support frame 20. After all the ballast elements 40 have been installed, the diaphragm wall cutter 10 can be erected. Alternatively, the ballast elements 40 can also be pushed directly into the slots in the support frame 20 when the diaphragm wall cutter 10 is in a vertical position. The ballast elements 40 are secured in an easily accessible manner on the front face of the support frame 20.

[0049] It is also possible to equip the support frame 20 with ballast elements 40 outside the molded wall cutter (or to remove the ballast elements 40) and to lift it as a whole by means of a crane (see [Fig.6]) and to integrate it into the cutter frame 12. For this purpose, the opening 16 on the cutter frame 12 is larger than the support frame 20, so that the latter passes through the opening 16. This allows for quick mounting / dismounting of the ballast elements 40. In principle, however, it is also conceivable that the support frame 20 constitutes a structure that is firmly connected to the cutter frame 12 and cannot be removed. For example, the housings with the receiving plates 26 could be permanently integrated into the cutter frame 12. List of reference numbers 10 - Milling cutter for molded wall 12 - Strawberry frame 14 - Milling tool (milling wheel) 16 - Opening 17 - First chassis section 18 - Second part of chassis 19 - Third chassis section 20 - Support frame 21 - Side wall 22 - Fixing section 23 - Rear wall 24 - Upper part / lower part 25 - Obviously 26 - Receiving plate 28 - Slinging element 30 - Fixing element 32 - Fixing element 40 - Ballast element 42 - Slinging element 44 - Fastening element 50 - Lifting device

Claims

Demands

1. Milling cutter for diaphragm wall (10), which can be connected to a carrier device, with a milling frame (12) and at least one milling tool (14) disposed on the milling frame (12), in particular a milling wheel, for grinding soil material, characterized by a support frame (20) connected to the milling frame (12) and at least two ballast elements (40) which can be removably mounted on or in the support frame (20).

2. Molded wall cutter (10) according to claim 1, the support frame (20) being arranged on or in the cutter frame (12) in such a way that the ballast elements (la 40) mounted thereon are arranged one above the other when the molded wall cutter (10) is in the suspended or vertical state, in particular along the longitudinal axis of the molded wall cutter (10).

3. Molded wall cutter (10) according to claim 2, the support frame (20) and the ballast elements (40) being formed such that the positions of the centers of gravity of the ballast elements (40) mounted in the support frame (20) and the position of the overall center of gravity of the molded wall cutter (10) coincide in plan view, the position of the overall center of gravity of the molded wall cutter (10) in plan view preferably being independent of the number and arrangement of the ballast elements (40) mounted in the support frame (20).

4. Molded wall cutter (10) according to any one of the preceding claims, the support frame (20) being disposed inside the cutter frame (12) and preferably not protruding beyond the outer contour of the cutter frame (12).

5. Molded wall milling cutter (10) according to claim 5, the milling frame (12) comprising an opening (16) and the support frame (20) being arranged so that the ballast elements (40) can be introduced into, or removed from, the support frame (20) from the outside through the opening (16), the opening (16) preferably being designed so that the support frame (20) as a whole can be introduced into and removed from the milling frame (12) from the outside.

6. Molded wall cutter (10) according to any one of the preceding claims, the support frame (20) and / or the ballast elements (40) including fastening elements (30, 32, 44) for fixing the ballast elements (40) removably on or in the support frame (20).

7. Molded wall cutter (10) according to any one of the preceding claims, the support frame (20) comprising at least two housings, in each of which a ballast element (40) can be inserted and preferably mounted removably, the housings and the ballast elements (40) preferably being designed identically and / or constituting a modular system.

8. Milling cutter for molded wall (10) according to claim 7, the housings each comprising at least one receiving plate (26) and / or rail on which the ballast elements (40) can be placed and / or inserted.

9. Molded wall cutter (10) according to any one of the preceding claims, the support frame (20) being removably connected to the cutter frame (12) and comprising slinging elements (28) for attaching a slinging means (50) of a winch.

10. Molded wall cutter (10) according to any one of the preceding claims, the cutter frame (12) comprising at least two frame parts (17, 18, 19) which can be removably connected to each other, said at least one milling tool (14) being preferably disposed on a first frame part (17) and the support frame (20) being disposed on or in a second frame part (18).

11. Milling cutter for molded wall (10) according to any one of the preceding claims, the ballast elements (40) comprising slinging elements (42) for the attachment of a slinging means (50) of a winch.

12. Molded wall cutter (10) according to any one of the preceding claims, the support frame (20) comprising at least one recess (25) for passing liquid, preferably at least one recess (25) being disposed on a rear wall (23) and / or a lower face (24) of the support frame (20).

13. Carrier device, in particular cable shovel, with a diaphragm wall cutter (10) according to any one of the preceding claims.

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