EP1452645B2 - Method for building a diaphragm wall in the ground and trench wall cutting apparatus - Google Patents

Abstract

Subterraneous curtain cutter (10) comprises a frame (20) which tapers from a lower end region, on which two pairs of cutting wheels (12, 12') are arranged, to its upper end. Independent claims are also included for the following: (1) Subterraneous wall cutting arrangement containing the above cutter; and (2) Method for producing a subterraneous curtain in the ground using the cutter. Preferred Features: A feeding device for introducing a liquid into the slot is arranged on the frame. A guiding rod (33) is arranged on the upper end of the frame.

Description

The invention relates to a method for producing a slot wall in the ground according to the preamble of claim 1. Furthermore, the invention relates to a trench wall cutter for producing a Frässchlitzes according to the preamble of claim 4.

A generic trench cutter and a generic method are from the JP-A-09273150 known. In a first step, a miller with a box-shaped frame is sunk to a supporting rope hanging to form a slot in the ground. To guide an upper portion of the slot is provided with guide walls, so as to specify an exact alignment of the box-shaped frame from the beginning. Through a clearance at the end faces of the box-shaped frame milling cuttings and supplied liquid is conveyed past the frame in a rear region of the slot. In a second step, after the grading of the slot to the final depth curable cement suspension can be introduced into the area of the cutting wheels and mixed by the rotating cutting wheels.

From the JP-A-11200404 is a trench cutter with a scaffold-like structured guide frame known. On the side surfaces of the cutting wheels injection nozzles are arranged, through which a cement liquid can be injected under pressure to the outside, so as to widen the Frässchlitz. A particularly long guide frame ensures safe guidance of the mill along the already milled diaphragm walls.

From the JP-A-08302670 is a method for producing a trench wall, in which the ground crushed by means of cutting wheels and the crushed soil material is conveyed together with supporting liquid via a pipe to the outside to a processing plant. After separation of coarse material, the liquid is returned to the slot and mixed via separate mixing wheels on the miller. The mill is mounted on a carrier which is constructed of H-shaped cross-section segments. The carrier with the cutter is suspended on a carrying cable. To guide the router in the upper area above the slot a guide frame construction is provided with guide walls.

From the JP-A-2000 160 592 is a chain cutter with two Frässchwertern known, which are mounted on a frame ausstellbarer. At the Frässchwertern with the milling chains, the lower sprockets can be additionally provided with cutting teeth. It is a linear guide device provided with guide rod, which allows a guided movement of the chain cutter.

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

At one of the DE-C-41 41 629 known one-phase process, the slot is supported from the beginning by a suspension which is prepared by mixing excavated soil material and a binder overground.

To carry out these known methods can from the DE-C-34 24 999 known trench wall milling application find. These known trench wall cutters have a trimming frame and, attached to this underside, rotating drivable cutting wheels. The trench cutter is lowered on a rope from a construction vehicle and penetrates into the ground due to its own weight. The guide of the trench wall cutter in the milling slot takes place via the milling frame, which is supported on the wall of the slot. Ground material cleared from the cutting wheels is supplied by the cutting wheels to a suction device attached to the milling frame and transported to the surface.

For the preparation of the binder-soil mixture, however, the methods described above require comparatively expensive, superimposed pumping, mixing and storage devices.

The object of the present invention is to provide a method for producing a trench wall in the ground and a trench wall cutter with which a trench wall can be produced efficiently and in good quality.

The object is achieved by a method having the features of claim 1 and a trench cutter with the features of claim 4. Preferred embodiments are given in the dependent claims.

In the method according to the invention for producing a slot wall in the ground, it is provided that the cleared soil material is conveyed by the cutting wheel into a rear region of the milling slot, that the cleared soil material in the milling slot is mixed with the settable liquid, and that the cleared soil material is at least partially in the Milling slot is left to form the slot wall.

A basic idea of the invention is to mix the soil material cleared away from the cutting wheels in the milling slot by the action of the cutting wheels with the settable liquid so to speak "in situ" and thereby to produce a hardening liquid-soil mixture. This eliminates the need to elaborate the entire cleared soil material by pumping equipment consuming to overground. The cleared soil material is conveyed according to the invention of the cutting wheels in a rear region of the Frässchlitzes. The back Area can be an area that is formed in the milling slot above the frame. According to the invention, the mixed with the liquid, cleared soil material is at least partially left in the milling slot, where it can harden to form the slot wall. However, due to a possible volume change of the soil material during the supply of the settable liquid, it may be advantageous to remove some of the cleared soil material with suspension from the milling slot. For this purpose, a discharge device can be provided on the trench wall cutter or surface at the edge of the trimming slot.

In principle, it is possible to drive the cutting wheels uniformly when drilling the Frässchlitzes. However, a particularly good milling action and / or a particularly good mixing of the soil material with the settable liquid can be achieved by reversely driving the cutting wheels. By a temporary reversal of the direction of rotation of the cutting wheel, turbulences are formed in the soil material, which ensure particularly good mixing with the settable liquid. Preferably, the cutting wheels are also uniformly or reversibly driven when pulling the trench wall cutter from the milling slot, which can significantly reduce the force required for pulling force and additional mixing of the cleared soil material is achieved with the settable liquid.

In the production of the Frässchlitzes the trench wall cutter can be moved uniformly in the ground. It is particularly advantageous, however, that the trench wall cutter is at least temporarily offset in an alternating upward / downward movement. As a result, a particularly good mixing of the removed soil material with the settable liquid is achieved. The stroke of this alternating upward / downward movement can be significantly less than the total height of the slot. It may in particular be of the order of the diameter of the cutting wheels. Such alternating at least temporarily performed upward and downward movement can be achieved by the trench wall cutter is lifted by a construction equipment and then discharged again. An alternating upward / downward movement can be carried out both when sinking the Frässchlitzes and when pulling the trench wall cutter from the finished Frässchlitz.

A trench wall cutter according to the invention is characterized in that the cross section of the frame is smaller than the cross section of the trimming slot to form a clearance through which cleared soil material from the at least one cutting wheel on the frame over in a rear portion of the trimming slot is conveyed.

A basic idea of the trench wall cutter according to the invention is to form a free space next to the frame, through which cleared soil material and suspension can flow as unhindered as possible on the frame of the trench wall cutter when producing the trimming slot and / or pulling out the trench wall cutter from the finished trimming slot. This allows a particularly fast and energy-saving milling with a simultaneous efficient mixing effect. To form the free space according to the invention, it is provided that the cross section of the frame perpendicular to the direction of advance of the trench wall cutter never completely covers the trimming slot. This is achieved in that the circumferential dimensions of the cross-section of the frame are smaller than the inner dimensions of the Frässchlitzes. In the cross section of the frame, one or more openings may be provided. Such an arrangement allows a passage of cleared soil material past the frame in the direction opposite to a direction of movement of the frame.

In a particularly preferred trench cutter, a plurality of cutting wheels are provided in any number, which have parallel axes of rotation. A preferred embodiment has four cutting wheels, two of which are arranged in pairs rotatable about the same axis of rotation. A cross section of the milling slot is preferably rectangular.

In an advantageous embodiment of the trench wall cutter according to the invention, the at least one cutting wheel has a suitable for a reversing rotary movement Fräszahnanordnung. Such a Fräszahnanordnung can clear pending soil material in a rotation of the cutting wheels both clockwise and counterclockwise. This allows a particularly good mixing of the soil material with a simultaneously high rate of degradation.

In principle, it is possible to provide a feed device for feeding a liquid, in particular a settable liquid, into the milling slot at an arbitrary position in the milling slot. According to the invention, however, such a feed device is arranged on the frame. In particular, by an arrangement near the at least one cutting wheel, a particularly good mixing of the cleared soil material with the liquid is achieved.

A slot wall milling device according to the invention is characterized in that the slot wall cutter is displaceably guided on the carrier device by means of a linear guide device.

According to one aspect of a trench wall cutting device according to the invention, the trench wall cutter is guided not on the wall of the trimming slot but on a carrier device spaced apart from the trench wall cutter. The guide takes place in particular in a direction parallel to the direction of advance of the trench wall cutter direction. Such an arrangement makes it possible to design the cross section of the frame of the trench wall cutter as small as possible. In particular, it is no longer necessary for the framework of the Trench wall cutter for lateral guidance in contact with the wall of the trimming slot. As a result, the frame can be configured without guide elements and its dimensions can be kept correspondingly small, which allows a simple passage of cleared soil material. The trench wall cutter can be used for example on a guide device, as is known in vibrators.

In a trench wall milling device according to the invention, the linear guide device has a guide rod, in particular a telescopic rod, on which the trench wall cutter is mounted. Such a guide rod allows a particularly good lateral guidance of the trench wall cutter. In particular, it also allows a transmission of an axial force directed in the advancing direction from the carrier device to the trench wall cutter, whereby a particularly fast propulsion of the trench wall cutter can be achieved during drilling. In principle, however, the trench wall cutter can also be designed such that it mills into the ground only when its cutting wheels are rotating due to its own weight. In this case, a guide rod can be used, which is not designed for the transmission of a thrust direction directed axial force.

The diameter of the guide rod is preferably dimensioned to be smaller than the diameter of the cross section of the frame. The guide rod preferably has a substantially rectangular or substantially circular cross-section. As a telescopic rod can also be used preferably a Kelly rod.

A particularly preferred slot wall milling device is further characterized in that the linear guide device has a guide sleeve arranged on the carrier device, through which the guide rod is guided. Such a guide sleeve can surround the guide rod wholly or partially in the circumferential direction. On the guide sleeve projections and / or depressions may be formed, which engage with corresponding recesses and / or projections on the guide rod and thus ensure a rotationally fixed guidance of the guide rod.

It is also particularly advantageous that an actuator, in particular a cable pull mechanism, is provided for the vertical movement of the guide rod on the carrier device. Such an actuator can be designed in addition to pulling the trench wall cutter from the Frässchlitz also be adapted to transmit an axial force in the advancing direction of the trench wall cutter on the trench wall cutter. As a result, a particularly good milling performance can be achieved. Further, the actuator may be configured to allow alternating upward / downward movement of the trench wall cutter. Possible embodiments of the actuator include a rack and pinion mechanism or a hydraulic mechanism.

Advantageously, the slot wall milling device according to the invention has the previously described trench wall cutter. In particular, the method according to the invention can be carried out with both.

Fig. 1

eine teilweise geschnittene Vorderansicht einer erfindungsgemäßen Schlitzwandfräse und einer Führungsstange;

Fig. 2

eine teilweise geschnittene Vorderansicht einer weiteren erfindungsgemäßen Schlitzwandfräse mit einer Führungsstange;

Fig. 3

eine Querschnittansicht der in Fig. 2 gezeigten Führungsstange entlang A-A;

Fig. 4

eine Seitenansicht einer erfindungsgemäßen Schlitzwandfräsvorrichtung;

Fig. 5

eine Seitenansicht einer weiteren erfindungsgemäßen Schlitzwandfräsvorrichtung;

Fig. 6

eine Teilansicht einer erfindungsgemäßen Schlitzwandfräsvorrichtung im hochgezogenen Zustand; und

Fig. 7

eine Teilansicht einer erfindungsgemäßen Schlitzwandfräsvorrichtung in einer Endstellung.

The invention will be further explained by means of preferred embodiments, which are schematically illustrated in the drawings. In the drawings show:

Fig. 1

a partially sectioned front view of a trench cutter according to the invention and a guide rod;

Fig. 2

a partially sectioned front view of another trench cutter according to the invention with a guide rod;

Fig. 3

a cross-sectional view of in Fig. 2 shown guide bar along AA;

Fig. 4

a side view of a Schlitzwandfräsvorrichtung invention;

Fig. 5

a side view of another Schlitzwandfräsvorrichtung invention;

Fig. 6

a partial view of a Schlitzwandfräsvorrichtung invention in the raised state; and

Fig. 7

a partial view of a Schlitzwandfräsvorrichtung invention in an end position.

The Fig. 1 and 2 show front views of two different embodiments according to the invention trench wall milling 10. On a running as a support plate frame 20 are two cutting wheels 12, 12 'rotatably mounted. The cutting wheels 12, 12 'are formed directly adjacent to each other with parallel axes of rotation. A housed and designed in the form of hydraulic motors drive 15, 15 'is mounted on the frame 20 and with the cutting wheels 12, 12' operatively connected.

On the cutting wheels 12, 12 'facing away from the sides of the frame 20, this is attached to a guide rod 33. As Fig. 3 can be removed, the guide rod 33 has an approximately circular cross section. Laterally on the guide rod 33 projections 35 are formed, which serve for the rotationally fixed guidance of the guide rod 33 in the guide sleeve 34. Within the guide rod 33 supply lines 40 are arranged for hydraulic fluid. Further, in the guide rod 33 and the frame 20 designed as a feed line feed device 41 is formed for a liquid. As in Fig. 2 is shown, the feed device 41 designed as a feed line passes through the frame 20 through and ends between the cutting wheels 12, 12 '.

On the cutting wheels 12, 12 'circumferentially cutting teeth 13 are formed. The cutting teeth 13 are arranged for an opposite operation of the cutting wheels. It is provided that the in Fig. 2 Milling wheel 12 shown on the left in the clockwise direction, the cutting wheel 12 'shown on the right is to be rotated counterclockwise. As a result, suspension in the central region is sucked through the cutting wheels 12, 12 ', while the milled soil material is conveyed together with suspension on the outer sides upwards. On the periphery of the cutting wheels 12, 12 'also known laterally pivotable folding teeth 14 are arranged, which clear the bottom below the transmission plate.

The Fig. 4 to 7 show a Schlitzwandfräsvorrichtung invention. The trench wall milling device has a carrier device 30 embodied as a crawler-driven construction vehicle. On the carrier device 30, a mast 31 is mounted on which in turn at two attachment points, a guide sleeve 34 is attached. Through the guide sleeve 34 extends in the vertical direction, the guide rod 33, at the lower end of the trench wall cutter 10 is attached. A cable pull mechanism 37 ( Fig. 4 ) or a displacement device 38 (FIG. Fig. 5 ) are provided for vertical movement of the guide rod 33. Supply lines 40 for hydraulic fluid and a supply line 41 for a settable liquid formed as a supply line occur at the upper end of the guide rod 33 out of this. In the raised state of the trench wall cutter 10 ( Fig. 6 ), the trench wall cutter 10 rests with its frame directly against the guide sleeve 34.

The frame 20 of the trench wall cutter 10 is designed so that when sinking ( Fig. 7 ) creates a space 6 between the frame 20 and a wall of the Frässchlitzes 3. This clearance 6 allows the passage of cleared soil material past the frame 20 in a rear region 4 of the Frässchlitzes 3, which is located above the trench wall cutter 10.

Claims (9)

1. Method for making a trench wall in the ground, in which

   - at least two cutting wheels (12, 12') directly and rotatably located on a frame (20) of a trench wall cutter (10) are given a rotary movement by a drive (15, 15'),

   - the trench wall cutter (10) with the frame (20) is lowered into the ground, wherein soil material located below the cutting wheels (12, 12') is stripped and a cut trench (3) is made,

   - the cut trench (3) is filled with a settable liquid, which is introduced into the cut trench (3) at the frame (20) between the cutting wheels (12, 12'),

   - the stripped soil material is conveyed from the cutting wheels (12, 12') in planned manner through a free space (6) along the frame (20) into a rear area (4) of the cut trench (3),

   - the stripped soil material is intermixed with the settable liquid in the cut trench (3), and

   - the stripped soil material is at least partly left in the cut trench (3) for forming the trench wall,
   characterized in that

   - the trench wall cutter (10) is linearly guided in the cut trench (3) by linear guidance means with a guide rod (33),

   - for providing the free space (6) the circumferential dimensions of the cross-section of the frame (20) are smaller than the internal dimensions of the cut trench (3) and the frame (20) is guided without contact to the wall of the cut trench (3).
2. Method for making a trench wall according to claim 1,
   characterized in that
   the cutting wheels (12, 12') are driven in reversing manner.
3. Method for making a trench wall according to claim 1 or 2,
   characterized in that
   when making the cut trench (3), the trench wall cutter (10) is at least temporarily given an alternating upward/downward movement.
4. Trench wall cutter (10) for making a cut trench having

   - a frame (20),

   - at least two cutting wheels (12, 12') directly and rotatably located on the frame (20),

   - a supply device (41) located on the frame (20) for supplying a liquid into the cut trench (3), wherein the supply device (41) ends between the cutting wheels (12, 12'),

   - wherein at the frame (20) a free space (6) is provided, through which stripped soil material is conveyable in planned manner from the cutting wheels (12, 12') along the frame (20) into a rear area (4) of the cut trench (3),
   characterized in that

   - linear guidance means with a guide rod (33), which is located at an upper end of the frame (20), and

   - the frame (20) has a cross-section, the circumferential dimensions of which are smaller than the internal dimensions of the cross-section of the cut trench (3) for forming a free space (6), wherein the frame (20) is guidable without contact to a wall of the cut trench (3).
5. Trench wall cutter according to claim 4,
   characterized in that
   cutting wheels (12, 12') have a cutting tooth arrangement suitable for a reversing rotary movement.
6. Trench wall cutting device (1) for making a trench wall, particularly using a method according to anyone of the claims 1 to 3, having

   - a carrier implement (30) and

   - a trench wall cutter (10) according to anyone of the claims 4 to 5, which is guided in substantially vertically displaceable manner on the carrier implement (30) by linear guidance means with a guide rod (33).
7. Trench wall cutting device (1) according to claim 6,
   characterized in that
   the guide rod (33) is formed as a telescopic rod.
8. Trench wall cutting device (1) according to claim 6 or 7,
   characterized in that
   the linear guidance means has a guide sleeve (34), which is located on the carrier implement (30) and through which is passed the guide rod (33).
9. Trench wall cutting device (1) according to anyone of the claims 6 to 8,
   characterized in that
   on the carrier implement (30) is provided a positioning drive, particularly a cable-hauled mechanism (37), for a vertical displacement of the guide rod (33).

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