EP3401444B1 - Underground diaphragm and method for creating a slit in the ground - Google Patents

Description

The invention relates to a trench wall device for creating a slot in the floor, comprising a base frame, at least one Bodenabtragseinrichtung, which at a lower end portion of the base frame, a holding device at an upper end portion of the base frame, a clamping device with at least two opposing and laterally movable clamping elements and at least one Stellzylinder through which the clamping elements for clamping at least a portion of the slot wall device in the slot are laterally extendable, and a pressure device, by which a pressing force on the at least one Bodenabtragseinrichtung can be applied, according to the preamble of claim 1.

The invention further relates to a method for creating a slot in the ground with a slot wall device, wherein a base frame of the slot wall device is held at an upper end portion by means of a holding means by means of at least one Bodenabtragseinrichtung, which is arranged at a lower end portion of the base frame, forming the slot Floor is removed, by means of a bracing at least two opposing clamping elements are extended by at least one actuating cylinder, wherein at least a portion of the Schlitzwandgerätes is braced in the slot and a pressing force is applied to the at least one Bodenabtragseinrichtung by means of a pressure device, according to the preamble of claim 12th

Such slotted wall devices are known in particular as so-called trench wall milling with cutting wheels as Bodenabtragseinrichtung. These are usually suspended on a carrier device via a carrying cable. This is the case with such devices maximum pressure on the ground limited by the weight of the diaphragm wall unit.

When working on harder soil, such as rocks or rocks, it may be necessary to apply a higher pressure force on the cutting wheels. This can in principle be done from outside the bottom slot by lifting tables or corresponding hydraulic cylinders on the carrier. In this case, however, a correspondingly massive linkage for transmitting the axial forces on the trench wall device is needed, which is very costly overall.

A state of the art is from the EP 0 811 724 B1 and the DE 697 28 713 T2 known. In this known trench wall cutter lateral clamping elements are provided on a base frame with which the base frame clamped in the milling frame and the base frame can be fixed to the ground. The cutting wheels are arranged on a vertically adjustable carrier unit, wherein the carrier unit can be pressed with the cutting wheels by means of vertically arranged hydraulic cylinder down when the base frame is clamped in the slot.

In this known trench cutter, a plurality of horizontally extendable clamping elements is to be provided, since the essential part of the trench cutter is braced against the walls of the slot. Thus, a significant part of the weight of the trench wall cutter is absorbed by the lateral walls of the slot. The so laterally removed weight of the trench wall cutter is thus no longer available as a pressing force for the cutting wheels. The pressure device with the hydraulic cylinders must be designed to be correspondingly large so that they can compensate for the missing weight pressure force of the diaphragm wall device on the one hand and can apply an additional pressure force to the cutting wheels on the other hand.

Au der DE 23 34 591 A1 goes out a drill gripper that can be braced in a borehole. The drill grapple shells are opened and closed by a central hydraulic cylinder.

The EP 2 378 002 A1 shows a trench cutter, which is guided by means of guide shoes on a vertical pile. A cutting wheel is diagonally adjustable under another cutting wheel.

A generic slotted wall unit goes out of the WO 2017/042 499 A2 out. Also in this trench wall device, the horizontal clamping cylinder must apply such a high pressure force on the wall of the slot that the trench wall device is not pressed by the propulsion force of the vertical jacking cylinder on the cutting wheels up.

The invention has for its object to provide a trench wall device and a method for creating a slot in the ground, wherein in a simple construction of the trench wall device in a particularly efficient manner, a high Andrucckraft can be applied to a Bodenabtragseinrichtung.

The object is according to the invention firstly by a slot wall device with the features of claim 1 and on the other by a method with the features of claim 12 solved. Preferred embodiments of the invention are indicated in the dependent claims.

The slotted wall device according to the invention is characterized in that the clamping device are arranged with at least two clamping elements and the at least one clamping cylinder on an intermediate frame, which is displaceably mounted along the base frame, and that the pressure device between the intermediate frame and the base frame is arranged.

Furthermore, the inventive method for creating a slot in the bottom is characterized in that the bracing means are arranged with the at least two clamping elements and the at least one clamping cylinder on an intermediate frame which is slidably mounted along the base frame, that clamped by the bracing of the intermediate frame and opposite is set to the ground and that by means of the pressure device of the base frame is pressed with the Bodenabtragseinrichtung down.

A basic idea of the invention is that, when processing harder soil material, a substantial part of the weight of the trench wall device continues to act on the soil removal device, a pressure force being essentially additionally applied by the pressure device.

This is achieved according to the invention in that the base frame on which the trench wall device is suspended or supported, remains connected to the Bodenabtragseinrichtung, while against the surrounding walls of the slot clamping only a relatively small intermediate frame takes place at which the plate-like clamping elements and the at least one clamping cylinder are arranged. In this case, the base frame with the Bodenabtragseinrichtung is slidably mounted on the intermediate frame.

In this way, even with a tension of the trench wall device in the slot, a large part of the weight of the trench wall device continues to act on the soil removal device. The pressure device is arranged between the intermediate frame and the base frame, so that in this way in addition to the weight of the base frame and the Bodenabtragseinrichtung a pressing force is applied. So since the pressure device only an additional Andrucckraft has applied, this can be designed more compact and overall cost.

A preferred embodiment of the trench wall device according to the invention is that the intermediate frame is slidably mounted on an outer side of the base frame. On the outside of the base frame corresponding guide and sliding means may be provided for the intermediate frame.

According to a development of the invention, it is particularly preferred for the base frame to have a box-type bearing section along which the intermediate frame is mounted and displaceably guided. The bearing section on the base frame can have a smaller cross section than adjacent areas of the base frame. The bearing portion is particularly designed so that the intermediate frame is slidably mounted between an upper position and a lower position along the vertical or the longitudinal axis of the base frame. In addition, a clearance is preferably formed on the bearing portion, in which the clamping device with the clamping elements and the adjusting cylinders are arranged so that they do not protrude in their outer dimensions in a retracted position does not extend beyond the outer periphery of the base frame. Upon appropriate actuation of the clamping device, the clamping elements are extended laterally, wherein these are moved from the retracted position into an outwardly projecting clamping position.

A particularly compact arrangement is achieved according to a modification of the invention in that the intermediate frame has a staple-like base slide on which the clamping elements are mounted displaceably. The base carriage of the intermediate frame thus constitutes a sleeve-like component which, in particular, surrounds the box-like bearing section in the manner of a clip. The particular plate-like clamping elements, which are relatively large in area and in width largely correspond to a width of the broad side of the base frame, are arranged on an outer side of the base carriage. Between the base carriage and the clamping elements of at least one actuating cylinder is arranged, which is preferably a hydraulically operated actuating cylinder, a so-called hydraulic cylinder.

Basically, only a single clamping element and in particular a pair of clamping elements can be provided, which are adjustable by means of a single actuating cylinder between the retracted rest position and the extended clamping position. It is particularly advantageous according to a development of the invention that a plurality of actuating cylinders between the clamping elements and the base carriage are arranged. In particular, in plate-like clamping elements with a large area can be provided two, three, four or more actuating cylinder. By a relatively large number of adjusting cylinders of the space of a single actuator cylinder is smaller, but overall high actuating forces continue to be achieved.

In principle, the actuating cylinder or cylinders can be arranged in a suitable manner, wherein the actuating forces can be translated via appropriate transmission mechanisms in a desired horizontal adjusting movement of the clamping elements.

A preferred embodiment of the trench wall device according to the invention is that a plurality of actuating cylinders are provided, which are arranged horizontally. As a result, the actuating forces of the actuating cylinder can be transmitted directly in the horizontal direction on the clamping elements. In particular, more than two clamping elements, such as two or four pairs of clamping elements can be provided, which are each actuated by adjusting cylinder. The horizontal actuating cylinders can be arranged between the clamping elements and the intermediate frame or extend through the intermediate frame and are supported on both sides by clamping elements.

A further improvement in the applicability of the trench wall device is achieved in that a plurality of second actuating cylinders are provided, which are arranged inclined to the horizontal. In this case, corresponding articulation or transmission mechanisms can be provided by which the obliquely directed actuating forces are converted in the desired manner into a horizontal adjusting movement of the clamping elements. In addition, an oblique position of the plate-like clamping elements can be achieved via oblique actuating cylinder, which can be advantageous in certain cases for an extension and retraction of the slot wall device in or out of the ground.

Furthermore, a high adaptability of the trench wall device is achieved in that each clamping element is adjustably connected via at least one pivot lever with the base slide. As a result, relatively high translation forces can be generated even with a limited space.

In principle, the pressure device can be designed in any manner which is suitable for applying an additional pressure force to the soil removal device. The pressure device is arranged between the base frame and the soil removal device.

According to the invention, it is provided that the pressure device has a plurality of pressure cylinders. The pressure cylinders are preferably operated hydraulically. In particular, two, three or four hydraulic pressure cylinders may be provided.

According to a variant of the invention, it is preferred that each pressure cylinder is attached on the one hand to the base frame and on the other hand to the base slide or a tensioning element. On the base frame, a corresponding holder may be provided, on which the individual pressure cylinders are articulated. Preferably, the cylinder housing is attached to the base frame, while the free end of the cylinder piston is attached to the base carriage or one of the clamping elements. The attachment can also be done via a swivel joint. The pressure device with the pressure cylinders can be arranged above or below the intermediate frame.

According to the invention it is provided that the pressure cylinders are arranged inclined to the vertical, wherein by pressing the pressure cylinder, the base frame with the Bodenabtragseinrichtung is pressed down relative to the braced intermediate frame. The inclination of the pressure cylinder to the vertical is preferably between 1 ° to 30 °, wherein the pressure cylinders are inclined in the direction of the intermediate frame to the outside. Due to this inclination, a certain force component is always generated during the application of the pressure force in the horizontal direction, through which the plate-shaped clamping elements are additionally pressed against the surrounding wall of the slot. hereby a further good positional fixation of the base frame is achieved in the slot even when applying high pressure forces on the Bodenabtragseinrichtung.

Furthermore, it is advantageous that the trench wall device is designed as a trench wall cutter, wherein the soil removal device has at least one cutting wheel. Preferably, a plurality of cutting wheels, in particular two pairs of cutting wheels, so a total of four cutting wheels are provided. The trench wall cutter thus formed can continuously remove soil, wherein, depending on the embodiment, the removed soil material is discharged via suitable pumping means to the outside of the trimming slot or mixed in situ within the trimming slot with supplied suspension.

Alternatively, it is provided according to a development of the invention that the trench wall device is designed as a diaphragm wall gripper, wherein the Bodenabtragseinrichtung comprises a gripper blade. A diaphragm wall grab can be used for the discontinuous lifting of soil material. The inventive design particularly high pressure forces can be generated, with which the gripper blade can penetrate particularly well in the soil to be removed.

Fig. 1

eine perspektivische Ansicht eines erfindungsgemäßen Schlitzwandgeräts in einem verkleinerten Maßstab;

Fig. 2

eine perspektivische Detailansicht einer Verspanneinrichtung des Schlitzwandgerätes von Fig. 1;

Fig. 3

eine Seitenansicht der Verspanneinrichtung von Fig. 2 in einem verspannten Zustand;

Fig. 4

eine Seitenansicht der Verspanneinrichtung von Fig. 3 im verspannten Zustand und beim Erzeugen einer Andruckkraft nach unten;

Fig. 5

eine Explosionsdarstellung der Verspanneinrichtung der Figuren 2 bis 4; und

Fig. 6

eine weitere perspektivische Ansicht der Verspanneinrichtung der Figuren 2 bis 5 in einem teilweise zerlegten Zustand.

The invention will be further elucidated on the basis of preferred exemplary embodiments, which are illustrated schematically in the drawings. In the drawings show:

Fig. 1

a perspective view of a slotted wall device according to the invention in a reduced scale;

Fig. 2

a detailed perspective view of a bracing of the slot wall device of Fig. 1 ;

Fig. 3

a side view of the bracing of Fig. 2 in a strained state;

Fig. 4

a side view of the bracing of Fig. 3 in the tensioned state and when generating a pressure force down;

Fig. 5

an exploded view of the bracing of the FIGS. 2 to 4 ; and

Fig. 6

a further perspective view of the bracing of the FIGS. 2 to 5 in a partially disassembled state.

An inventive slotted wall device 10 according to Fig. 1 is formed as a trench cutter with a base frame 12, at the lower end of which two pairs of cutting wheels 22 are mounted as a soil removing means 20. The trench wall device 10 is attached via a holding device 14, not shown, at the upper end of the base frame 12, in particular via a supporting cable, to a mast of a carrier vehicle, not shown.

The base frame 12 is provided along its outside with projecting, plate-shaped guide elements 13, which serve to guide the trench wall cutter in the Frässchlitz. In an intermediate region of the base frame 12, in particular in the lower half and close to the Bodenabtragseinrichtung 20 on a bearing portion 16, a clamping device 50 is formed with two opposite plate-shaped clamping elements 52. The plate-shaped clamping elements 52 extend substantially over the entire longitudinal or broad side of the slot wall device 10, whereby a large-area support along the wall of the milled slot is achieved. The slot is removed by a corresponding rotation of the cutting wheels 22 via hydraulic drives not shown on the base frame 12. The removed soil material is pumped together with a support suspension, which is introduced into the forming slot, via a pumping means, not shown, on the base frame 12 and conveyed away over the surface.

In normal operation, the maximum pressing force of the trench wall device 10 on the Bodenabtragseinrichtung 20 by the weight of the trench wall device 10 is predetermined and limited. In order to increase a contact pressure on the soil removal device 20 when hitting a harder rock material, a pressure device 30 with pressure cylinders 32 is provided.

Construction and operation of the bracing device 50 and the pressure device 30 are described below in connection with the FIGS. 2 to 6 explained in more detail.

The bracing device 50 with the two plate-shaped clamping elements 52 is mounted on an intermediate frame 60 with a sleeve-shaped base carriage 62. The base carriage 62 with its rectangular open cross-section is mounted axially along a longitudinal axis of the base frame 12 on the box-shaped bearing portion 16 of the base frame 12. The sleeve-shaped base carriage 62 engages fitting the rectangular bearing portion 16, as from the Figures 3 and 5 particularly clear.

The bracing device 50 has for substantially horizontal adjustment of the plate-shaped clamping elements 52 between a retracted rest position and one in the Figures 3 and 4 shown clamping position a plurality, preferably four, first actuating cylinder 54. These extend substantially horizontally through recesses on the base carriage 62 and the bearing portion 16 between the two clamping elements 52 and are hinged thereto. Thus, the respectively parallel and oppositely disposed clamping element 52 serves as an abutment for the other clamping element 52. Preferably, the horizontal first actuating cylinder 54 contact neither the base carriage 62 nor the bearing portion 16. The recesses 17 in the bearing portion 16 are designed as vertically oriented slots that a vertical displacement of the protruding first actuating cylinder 54 is made possible.

The clamping elements 52 are each connected via two mutually parallel pivot lever 64 pivotally connected to the base carriage 62. Furthermore, each two clamping elements 52 each second actuating cylinder 56 are arranged, which are arranged in an inclined position to the horizontal. The second actuating cylinder 56 are each hinged to an eye of the clamping element 52 and an eye on base carriage 62. By operating the second actuating cylinder 56, an orientation of the plate-shaped clamping elements 52 can be adjusted in deviation from the vertical.

To generate a pressing force on the soil removal device 20, a pressure device 30 with two hydraulic pressure cylinders 32 per clamping element 52 is provided above the tensioning device 30. The pressure cylinders 32 extend from an eye 53 at the upper end of the clamping elements 52 to a holder 18, which are firmly connected to the base frame 12 of the trench wall device 10.

In the illustrated embodiment, the cylinder housings 34 of the pressure cylinders 32 are attached to the bracket 18 while the respective pistons 36 extend to the tension members 52.

In the Figures 2 and 3 the tensioning device 50 is shown in a tensioned state, whereby no additional pressure force is applied to the soil removal device 20 via the pressure device 30.

By retracting the pressure cylinder 32, the pistons 36 are retracted into the cylinder housing 34, the brackets 18 and rigidly connected to the base frame 12 against the outwardly extended clamping elements 52, which are clamped to the wall of the slot and thus fixed, axially after pressed down. In this case, the base frame 12 slides with its bearing portion 16 relative to the base slide 62 of the intermediate frame 60 down, as clearly in Fig. 4 is shown. Thus, a pressure force can be applied to the base frame 12 and attached to the underside of the base frame 12 Bodenabtragseinrichtung 20 by retracting the pressure cylinder 32. At the same time, the base frame 12 can be moved downwards relative to the tensioned tensioning device 50 and the base carriage 62. Thus, in the arrangement according to the invention, the pressure force applied by the pressure cylinders 32 adds to the weight force of the base frame 12, which is still present at the soil removal device 20. Overall, according to the invention, a relatively high pressure force can be applied to the soil removal device 20, in particular to the cutting wheels 22.

For a relative displacement of the bracing device 50 relative to the base carriage 12 with the bearing section 16, the recesses 17 in the bearing section 16 are designed as vertically directed slots. By an appropriate Extending the pressure cylinder 32 back to the position according to Fig. 3 in the reverse manner lead to a lifting and shifting of the base frame 12 relative to the base slide 62 of the intermediate frame 60, so that the Bodenabtragseinrichtung 20 is then relieved accordingly.

Claims (12)

1. Trench wall apparatus for creating a trench in the ground, having:

   - a base frame (12);

   - at least one soil excavation means (20), which is positioned at a bottom section of the base frame (12);

   - a holding means (14) for suspending the trench wall apparatus (10) at a top section of the base frame (12);

   - a clamping means (50) with at least two clamping elements (52) lying on opposite sides and laterally displaceable, and at least one actuating cylinder (54), through which the clamping elements (52) can be extended laterally against a wall of the trench in order to clamp at least one part of the trench wall apparatus (10) in the trench, and

   - a pressing means (30) by which a pressing force can be applied to the at least one soil excavation means (20),

   - wherein the clamping means (50) with the at least two plate-like clamping elements (52) and the at least one clamping cylinder (54) are positioned on an intermediate frame (60), which is mounted along the base frame (12) to a box-like mounting section (16) such that it can be displaced, and

   - wherein the pressing means (30) is positioned between the intermediate frame (60) and the base frame (12) and has several pressing cylinders (32),

   characterized in that
   the pressing cylinders (32) are arranged in a titled way toward the vertical, whereby the base frame (12) with the soil excavation means (20) can be pressed downward relative to the clamped intermediate frame (60) when actuating the pressing cylinders (32), and
   that each titled pressing cylinder (32) is articulated to the base frame (12) on the one hand and to one of the plate-shaped clamping elements (52) on the other hand.
2. Trench wall apparatus according to claim 1,
   characterized in that
   the intermediate frame (60) is mounted on an external side of the base frame (12) such that it can be displaced.
3. Trench wall apparatus according to claims 1 and 2,
   characterized in that
   the intermediate frame (60) is mounted along the box-like mounting section (16) and guided such that it can be displaced.
4. Trench wall apparatus according to any one of claims 1 to 3,
   characterized in that
   the intermediate frame (60) has a clamp-like base carriage (62), on which the clamping elements (52) are mounted such that they can be displaced.
5. Trench wall apparatus according to claim 4,
   characterized in that
   several actuating cylinders (54) are positioned between the clamping elements (52) and the base carriage (62).
6. Trench wall apparatus according to any one of claims 1 to 5,
   characterized in that
   several first actuating cylinders (54) are provided which are positioned horizontally.
7. Trench wall apparatus according to any one of claims 1 to 6,
   characterized in that
   several second actuating cylinders (56) are provided which are arranged tilted toward the horizontal.
8. Trench wall apparatus according to any one of claims 4 to 7,
   characterized in that
   each clamping element (52) is connected in a displaceable way to the base carriage (62) by at least one pivoted lever (64).
9. Trench wall apparatus according to claims 1,
   characterized in that
   the pressing cylinders (32) are arranged above the intermediate frame (60).
10. Trench wall apparatus according to claims 1 to 9,
    characterized in that
    it is designed as a trench cutter, whereby the soil excavation means (20) has at least one cutting wheel (22).
11. Trench wall apparatus according to claims 1 to 9,
    characterized in that
    it is designed as a trench grab, whereby the soil excavation means (20) has a grabbing bucket.
12. Method for creating a trench in the ground using a trench wall apparatus (10) according to any one of claims 1 to 11, whereby

    - by means of a holding means (14) a base frame (12) of the trench wall apparatus (10) is held at a top section,

    - by means of at least one soil excavation means (20), which is positioned at a bottom section of the base frame (12), soil being excavated while forming the trench,

    - by means of one clamping means (50) at least two clamping elements (52) lying on opposite sides are extended laterally against a wall of the trench by at least one actuating cylinder (54), whereby at least one part of the trench wall apparatus (10) is clamped in the trench, and

    - by means of a pressing means (30) a pressing force is applied to the at least one soil excavation means (20),

    - wherein the clamping means (50) with the at least two plate-like clamping elements (52) and the at least one clamping cylinder (54) are positioned on an intermediate frame (60), which is mounted along the base frame (12) to a box-like mounting section (16) such that it can be displaced,

    - wherein the intermediate frame (60) is clamped and is fixed in regard to the soil by the clamping means (50), and

    - wherein the base frame (12) with the soil excavation means (20) is pressed at the bottom section downward by means of the pressing means (30) having several pressing cylinders (32),

    characterized in that
    the pressing cylinders (32) are arranged in a titled way toward the vertical, whereby the base frame (12) with the soil excavation means (20) is pressed downward relative to the clamped intermediate frame (60) when actuating the pressing cylinders (32), and
    that each titled pressing cylinder (32) is articulated to the base frame (12) on the one hand and to one of the plate-shaped clamping elements (52) on the other hand.

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