EP3543408A1 - Slurry wall mill and method for creating a milled slit in the ground - Google Patents

Abstract

The invention relates to a trench cutter and a method for creating a Frässchlitzes in the ground with a cutter frame, at least a pair of cutting wheels, which are rotatably mounted and driven at a lower end of the Fräsrahmens, each cutting wheel along its outer periphery has a plurality of Fräszähnen, and a supply and / or discharge device for feeding or discharging a milling fluid into or out of the milling slot in the area of the cutting wheels. According to the invention, a cleaning device for cleaning the cutting wheels in milling operation with a cleaning fluid is provided at a distance from the supply and / or discharge device and that the cleaning device has a plurality of cleaning nozzles which are directed onto the outer circumference of at least one cutting wheel and for injecting the Cleaning fluids are formed for dissolving adhering soil material.

Description

The invention relates to a trench wall cutter for creating a Frässchlitzes in the ground with a cutter frame, at least a pair of cutting wheels, which are rotatably mounted and driven on the Fräsrahmen, each cutting wheel along its outer periphery has a plurality of Fräszähnen, and a feed and / or Discharge device for feeding a milling fluid into or out of the milling slot in the area of the cutting wheels, according to the preamble of claim 1.

Furthermore, the invention relates to a method for creating a Frässchlitzes in the ground with such a trench cutter, wherein the cutting wheels are driven in rotation and the trench wall drills sunken into the ground and soil material is milled, the Frässchlitz created in the ground, according to the preamble of claim 13th

Such trench wall cutters are used to create so-called slot walls or sealing walls, which are required for securing or sealing excavation pits, for example. By means of a trench cutter, a first trimming slot is created, which is filled with a curable material. This mass hardens to a slot wall segment. By juxtaposing a plurality of trench wall segments, a trench wall of a desired size can thus be created.

From the EP 1 452 645 A1 is a generic trench cutter for creating a slot wall in the ground out. Between the two pairs of cutting wheels opens a feeding device, by means of which a settable liquid can be introduced into the milling slot in the area between the cutting wheels. The supplied settable liquid is thereby by the rotational movement of the cutting wheels with the milled soil material blended into a hardenable mass, which can then harden to the slot wall segment. In this known method, the milled soil material is mixed directly in situ in the milling slot to the curable composition.

Another method for producing a trench wall segment in the ground is from the DE 41 41 629 A1 out. In the trench wall cutter used for this purpose, a discharge device is provided between the cutting wheels, with which the milled soil material is sucked directly with befindenen in the milling slot supporting liquid to the surface. The extracted suspension can be de-enriched in a separator of soil material and returned to an upper portion of the Frässchlitzes. The suspension can be processed in such a way that it represents a hardenable mass which cures to the slot wall segment in the milling slot.

When creating a Frässchlitzes means of a trench cutter, there is basically the problem that when milling in cohesive soils, ie, for example, in clay, silt, claystone, etc., the ground removed by the cutting wheels adheres to the cutting teeth of the cutting wheels and can glue the cutting wheels so. This can lead to the bonding being so strong that the trench wall cutter has to be pulled out of the trimming slot in order to mechanically clean the cutting wheels. Since cutting slots can reach a depth of 40 meters or more, this represents a great expenditure of time and thus an economic disadvantage. The daily milling performance of a trench wall cutter can thereby be markedly reduced.

For releasing adhering soil material between annular rows of cutting teeth on a cutting wheel, it is approximately from the EP 2 685 007 A1 known to attach so-called Räumerplatten the Fräsradrahmen, which protrude into the spaces between the annular rows of Fräszähnen. However, the Räumerplatten must maintain a certain distance from the cutting wheels and the Fräszähnen, so that only a partial removal of adhering soil material can be achieved.

The invention has for its object to provide a trench cutter and a method for creating a Frässchlitzes in the ground, with which a Frässchlitz can be made particularly efficient.

The object is achieved according to the invention by a trench cutter with the features of claim 1 and by a method having the features of claim 14. Preferred embodiments of the invention are indicated in the dependent claims.

The trench wall cutter according to the invention is characterized in that spaced apart from the supply and / or discharge device a cleaning device for cleaning the cutting wheels in milling operation with a cleaning fluid is provided and that the cleaning device has a plurality of cleaning nozzles, which are directed to the outer periphery of at least one cutting wheel and are formed for injecting the cleaning fluid for releasing adhering soil material.

The basic idea of the invention is to provide a cleaning device spaced apart or separate from the supply and / or discharge device for a milling fluid, by means of which the cutting wheels can be cleaned in the milling operation by means of a cleaning fluid. By means of a cleaning fluid, the cutting wheels and in particular the cutting teeth can be cleaned particularly reliably and without significant wear in the milling operation, rotate in which the cutting wheels and work off soil material.

It is an aspect of the invention that the cleaning device has a plurality of cleaning nozzles, which are directed to the outer periphery of at least one cutting wheel and are designed for injecting the cleaning fluid for releasing adhering to the cutting teeth soil material. The cleaning fluid may be a liquid or a gas or a gas-liquid mixture. The cleaning nozzles are spaced from the feeding device for milling fluid, which supplies a relatively large amount of milling fluid in a milling process with in situ mixing in the Frässchlitz for operating the milling machine. By arranging a plurality of cleaning nozzles, which are specifically aligned with the cutting wheels and in particular the cutting teeth and tooth holder, a targeted release of adhering soil material can be achieved. As a result, the cutting wheels, even with longer operating times when milling cohesive soil material on a largely consistently high milling performance, without the milling operation for cleaning the trench wall cutter would have to be interrupted for days. This not only increases the daily milling performance of a mill, but also leads to improved quality of the hardenable Mass in the milling slot, since the Frässchlitz can be preferably processed in a stroke of the trench wall cutter. In addition, the milling resistance and thus the energy consumption are reduced.

A preferred embodiment of the trench wall cutter according to the invention is that two pairs of cutting wheels are provided and that the supply and / or discharge device is arranged in a middle between the two cutting wheels. The cutting wheels of a pair are rotatably mounted about a common axis of rotation. The axis of rotation is preferably arranged horizontally in the milling operation. The axes of rotation of the two pairs are arranged in parallel. The supply and / or discharge device is arranged in the middle between the two cutting wheels, so that the milling fluid can be fed or discharged centrally. The cleaning device with the cleaning nozzles for the individual cutting wheels are arranged in each case spaced from the center laterally to the respective cutting wheels.

In a simple embodiment, fixed cleaning nozzles can be provided. In particular, for adjustment to modified floors and tooth arrangements, it is preferred according to a development of the invention that the cleaning nozzles are mounted adjustable. It can be provided, for example, ball nozzles, which can be tightened by means of a corresponding nut in a set position.

According to a further embodiment of the invention, it is advantageous that the cleaning device comprises nozzle rails, wherein in each case a nozzle rail along the outer circumference of each cutting wheel is arranged and runs approximately parallel to the axis of rotation of the cutting wheel. In principle, several nozzle rails can be provided per cutting wheel. A nozzle rail may be referred to as a so-called common rail, which is supplied with cleaning fluid via a supply line from a central pressure generating device, in particular an injection pump. By means of corresponding adjustment valves on the individual cleaning nozzles or the nozzle rails, it is also possible to provide and set different injection quantities and injection pressures at the individual cleaning nozzles.

Such a trench wall cutter is preferably further developed in that rod-shaped cleaning rails are attached to the nozzle rail, that the cutting teeth on a cutting wheel are arranged in annular Fräszahnreihen, which are axially spaced apart to form annular Zwischenraumen, and that the rod-shaped cleaning nozzles protrude into the annular spaces. In particular, when milling cohesive soils cutting wheels are used, in which the cutting teeth are arranged in axially offset from each other annular Fräszahnreihen on the outer circumference of a cutting wheel. Between the annular Fräszahnreihen annular spaces are formed, in which protrude the rod-shaped cleaning nozzles. The rod-shaped cleaning nozzles extend from the respective nozzle rail in the direction of the cutting wheel center. The rod-shaped cleaning nozzles may have a nozzle opening or a plurality of nozzle openings, so that targeted nozzles can be directed to the cutting teeth in the Fräszahnreihen or the outer periphery of the cutting wheels. At the cleaning openings adjustable nozzles can be provided.

In principle, a cleaning of the cutting wheels in the milling operation can be achieved solely by the cleaning device with the cleaning fluid. A particularly good cleaning is achieved according to a development of the invention in that the milling frame Räumerplatten are arranged to strip adhering soil from the cutting wheels. Scraper plates are basically known from the prior art. These are mechanical stripping devices, which preferably extend into the annular spaces between the annular Fräszahnreihen to strip there located soil material from the interstices. However, the mechanical clearing plates are to be arranged at a certain distance from the Fräszahnreihen to avoid in milling milling collisions, which could occur due to vibrations of the individual machine parts in operation. In addition to this mechanical cleaning remaining residual soil material can be removed by the cleaning fluid with the cleaning device according to the invention.

It is particularly advantageous according to a development of the invention that the cleaning nozzles are integrated into the reamer plates or mounted close to them. Thus, the reamer plates themselves may be formed as hollow plates, wherein the cavity serves as a supply of cleaning fluid to the cleaning nozzles on the reamer plates. Alternatively, in particular the rod-shaped cleaning nozzles on a Be mounted outside the Räumerplatten to remove remaining residual soil material from the Fräszähnen.

A particularly good cleaning is achieved according to an embodiment of the invention in that the nozzle rails are connected via leads with at least one injection pump, with which the cleaning fluid can be injected under pressure. The injection pump can be arranged over days or on the cutting frame of the trench wall cutter.

In this case, according to an embodiment variant of the invention, it is preferred that a control device is provided with which the injection pressure and / or an injection quantity of the cleaning fluid can be adjusted. In this case, depending on the adhesion property of the soil material to be scoured, a sufficient injection pressure and a sufficient injection quantity of cleaning fluid can be set in order to reliably clean the cutting teeth from soil material. At the same time, a desired pressure can also be set via the control device in the area of the cutting wheels, which can have a positive effect on the milling and the mixing of milled ground material with milling fluid.

In principle, a gas or any liquid can be used as cleaning fluid. According to a development of the invention, it is particularly advantageous that the cleaning fluid corresponds to the milling fluid. In particular, the cleaning fluid may be a curable suspension, in particular a cement suspension, which is used for detaching soil material. At the same time, the cleaning fluid injected under pressure can simultaneously assist a mixing of the milled ground material, so that, in particular in the case of an in situ process, a particularly good hardenable suspension is established for forming the slot wall element. As cleaning fluid and water can be provided to clean about the end of an operating day, the cutting wheels through the cleaning device outside the Frässchlitzes.

A further preferred embodiment of the invention consists in that the feed device has a feed pump for feeding the milling fluid, wherein the milling fluid and the cleaning fluid are mixed with the cutting wheels in the milling slot with milled ground material to form a curable suspension. In such a trench cutter for an in situ milling and mixing process is preferably as Cleaning fluid used the milling fluid. The feed pump on the milling frame can guide both the milling fluid to the feeder and the cleaning fluid to the cleaning nozzles. As a result, a particularly efficient construction of the trench wall cutter can be achieved.

Alternatively it can be provided according to a development of the invention that the discharge device has a suction pump, with which milling liquid is sucked out of the Frässchlitz with the cleaning fluid and milled soil material. In this milling method, a so-called suction box at the lower end of the trench wall cutter by means of the suction pump and the discharge device, which has one or more suction, sucked out of the milling slot milling liquid below the cutter frame.

Furthermore, it is preferred in a trench wall cutter according to the invention that at a top end of the trimming frame, a rope or a rod is attached, with which the trench wall cutter is suspended on a carrier device and vertically adjustable. A cleaning of the cutting wheels in the milling operation can be done both during the milling of the soil material as well as during a lifting movement by means of the rope or the rod.

The inventive method for milling a Frässchlitzes in the ground with the aforementioned trench wall cutter is characterized in that during milling via a cleaning device, a cleaning fluid is sprayed onto the outer periphery of the cutting wheels, wherein adhering to the cutting wheels soil material is released. With the method according to the invention, the advantages described above can be achieved when using a trench wall cutter according to the invention.

Fig. 1

eine perspektivische Ansicht eines unteren Teiles einer erfindungsgemäßen Schlitzwandfräse mit den Fräsrädern;

Fig. 2

eine Vorderansicht der Schlitzwandfräse von Fig. 1;

Fig. 3

eine Seitenansicht der Schlitzwandfräse der Figuren 1 und 2;

Fig. 4

eine Ansicht der Schlitzwandfräse von den Figuren 1 bis 3 von unten; und

Fig. 5

eine perspektivische Ansicht eines Teils der Reinigungsvorrichtung für die Fräsräder.

The invention will be described in more detail below with reference to a preferred embodiment, which is shown schematically in the figures. In the figures show:

Fig. 1

a perspective view of a lower part of a trench cutter according to the invention with the cutting wheels;

Fig. 2

a front view of the trench wall cutter of Fig. 1 ;

Fig. 3

a side view of the trench wall cutter the FIGS. 1 and 2 ;

Fig. 4

a view of the trench wall cutter from the FIGS. 1 to 3 from underneath; and

Fig. 5

a perspective view of a part of the cleaning device for the cutting wheels.

A trench wall cutter 10 according to the invention with a milling frame 12 is in the FIGS. 1 to 4 shown in the different views. At a lower end of the milling frame 12, which is only partially shown, a pair of second cutting wheels 15 are mounted rotatably about a common axis of rotation and on a second gear plate 11 b a pair of second cutting wheels 15 rotatably together about a different axis of rotation on a first gear plate 11a. The cutting wheels 14, 15 each have a drum-shaped hub 17, on the outer periphery of a plurality of cutting teeth 20 are mounted with Fräszahnhaltern 18. The cutting teeth 20 are detachably mounted in the Fräszahnhaltern 18. The Fräszahnhalter 18 with the cutting teeth 20 are arranged along the outer periphery of each cutting wheels 14, 15 in annular Fräszahnreihen 22, as clearly from the FIGS. 3 and 4 evident. The individual Fräszahnreihen 22 are axially spaced apart, so that between these annular spaces 24 are formed.

In milling operation, 18 ground materials can be attached to the cutting teeth 20, the Fräszahnhaltern 18 and in the spaces 24 between the cutting teeth 20 and the Fräszahnhaltern, especially when milling cohesive soil, such as clay. To remove adhering soil material 12 plate-shaped Räumerplatten 50 are attached to the underside of the cutter frame, which comb-like engage in the annular spaces 24 between the cutting teeth 20 to mechanically strip adhering soil material. The Räumerplatten 50 are mounted on both sides of a central discharge device 30, which is designed for the extraction of milling fluid from the created Frässchlitz. In this case, the discharge device 30 has a suction box 32 extending parallel to the axes of rotation and tapering towards the bottom. On its underside, the suction box 32 is provided with a plurality of suction openings 34, as can be seen Fig. 3 can be seen.

The in the FIGS. 1 to 4 Trench wall cutter 10 shown is designed for carrying out a milling process, in which the removed soil material together with surrounding support or milling liquid from the working area of the cutting wheels 14, 15 is sucked off and transported to the surface over days. Alternatively, instead of the discharge device 30, a corresponding feed device 30 may be provided, through which milling fluid is fed into the region between the cutting wheels 14, 15. Such a trench wall cutter 10 would be designed for carrying out a milling process, in which the abraded soil material is mixed together with the milling liquid to a suspension in situ in the milling slot, which preferably hardens after removal of the trench wall cutter 10 from the Frässchlitz and so to a slot wall segment or Schlitzwandpaneel for a Crevice wall hardens.

According to the invention, a cleaning device 40 with cleaning nozzles 46, which are directed onto the outer circumference of the cutting wheels 14, 15, is arranged on both sides at a distance from the discharge device 30. A part of the cleaning device 40 is enlarged in FIG Fig. 5 shown. The cleaning device 40 has two clip-like holding frame 41, of which a holding frame 41 in Fig. 5 is shown. At the lower end of the U-shaped holding frame 41 in each case a nozzle rail 42 is attached, which is spaced from the discharge device 30 and is directed parallel to the axes of rotation of the cutting wheels 14, 15. The two nozzle rails 42 of two opposite cutting wheels 14, 15 are connected via a feed line 44 only partially shown with a supply pump, not shown. Via the feed pump, a cleaning fluid, in particular a liquid, can be supplied under pressure via the supply lines 44 to the nozzle rails 42.

On an underside of the nozzle rails 42 48 adjustable rod-shaped cleaning nozzles 46 are mounted on clamping nuts. By means of the clamping nuts 48, the cleaning nozzles 46 can be released and at least partially changed in their orientation and thus adjusted to the respective arrangement of cutting teeth 20 on the cutting wheels 14, 15. The cleaning nozzles 46 have nozzle openings, from which the cleaning fluid exits under pressure in order to loosen soil material adhering to the cutting teeth 20 and the milling tooth holders 18 in the milling operation. The cleaning nozzles 46 engage in a comb-like manner in the annular spaces 24.

The feed pump for injecting the cleaning fluid into the cleaning nozzles 46 may preferably be arranged on the milling frame 12 of the trench wall cutter 10. Preferably, the cleaning fluid used may be the milling fluid which is located in the milling slot.

With the trench wall cutter 10 according to the invention described above, the above-described method for creating a trimming slot in the ground can be carried out, wherein in milling operation with rotating cutting wheels 14, 15 adhering soil material from the cutting wheels 14, 15 can be solved by the cleaning device 40.

Claims (14)

Trench wall cutter for creating a trench slot in the ground with a milling frame (12), - At least one pair of cutting wheels (14, 15) which are rotatably supported and driven at a lower end of the Fräsrahmens (12), each cutting wheel (14, 15) along its outer periphery a plurality of Fräszähnen (20), and a supply and / or discharge device (30) for feeding or discharging a milling fluid into or out of the milling slot in the area of the cutting wheels (14, 15), characterized, - That at a distance from the supply and / or discharge device (30) is provided a cleaning device (40) for cleaning the cutting wheels (14, 15) in the milling operation with a cleaning fluid and - That the cleaning device (40) has a plurality of cleaning nozzles (46) which are directed to the outer periphery of at least one cutting wheel (14, 15) and are designed for injecting the cleaning fluid for releasing adhering soil material. Trench wall cutter according to claim 1,
characterized,
that two pairs of cutting wheels (14, 15) are provided and
in that the supply and / or discharge device (30) is arranged in a middle between the two cutting wheels (14, 15). Trench wall cutter according to claim 1 or 2,
characterized,
that the cleaning nozzles (46) are adjustably mounted. Trench wall cutter according to one of claims 1 to 3,
characterized,
in that the cleaning device (40) has nozzle rails (42), wherein in each case a nozzle rail (42) is arranged along the outer circumference of each cutting wheel (14, 15) and extends approximately parallel to the axis of rotation of the cutting wheel (14, 15). Trench wall cutter according to claim 4,
characterized,
that rod-shaped cleaning nozzles (42) are attached to the nozzle rail (42),
that the cutting teeth (20) on a cutting wheel (14, 15) in annular Fräszahnreihen (22) are arranged, which are axially spaced apart to form annular spaces (24), and
in that the rod-shaped cleaning nozzles (46) protrude into the annular intermediate spaces (24). Trench wall cutter according to one of claims 1 to 5,
characterized,
that on the cutting frame (12) Räumerplatten (50) for stripping adhering soil material from the cutting wheels (14, 15) are arranged. Trench wall cutter according to claim 6,
characterized,
are that the cleaning nozzles (46) integrated into the Räumerplatten (50) or mounted near to them. Trench wall cutter according to one of claims 4 to 7,
characterized,
in that the nozzle rails (42) are connected via supply lines (44) to at least one injection pump with which the cleaning fluid can be injected under pressure. Trench wall cutter according to claim 8,
characterized,
that a control device is provided with which the injection pressure and / or an injection amount of the cleaning fluid is adjustable. Trench wall cutter according to one of claims 1 to 9,
characterized,
that the cleaning fluid which corresponds Fräsflüssigkeit. Trench wall cutter according to one of claims 1 to 10,
characterized,
that the feed device (30) comprises a supply pump for supplying the Fräsflüssigkeit, wherein the Fräsflüssigkeit and the cleaning fluid with the cutting wheels (14, 15) in the cut trench are mixed with abgefrästem soil material to a hardenable suspension. Trench wall cutter according to one of claims 1 to 10,
characterized,
in that the discharge device (30) has a suction pump with which milling fluid is sucked out of the milling slot with the cleaning fluid and milled ground material. Trench wall cutter according to one of claims 1 to 12,
characterized,
in that a cable or a bar with which the trench wall cutter (10) is suspended from a carrier device and vertically adjustable is mounted on an upper end of the trimming frame (12). A method of milling a mill slot in the ground with a trench cutter according to any one of claims 1 to 13,
wherein the cutting wheels (14, 15) are driven in rotation and the trench wall cutter (10) is sunk into the ground and ground material is milled, whereby the trimming slot is created in the ground,
characterized,
in that a cleaning fluid is sprayed onto the outer circumference of the cutting wheels (14, 15) during milling via a cleaning device (40), soil material adhering to the cutting wheels (14, 15) being released.

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