EP0412477A1 - Grab bucket provided with anchoring means to the trench wall - Google Patents

Abstract

Positively guided trenching grab with two grab shovels which can be actuated by rope or hydraulically by means of a pull/push linkage for opening and closing and are linked at the bottom end of the grab frame to a mounting block (4) which is formed from longitudinally running stems (3) arranged symmetrically to the grab axis, with a grab frame of four stems which are attached in a fork shape to the bottom roller block and are connected at their top ends by means of a detachably arranged crosshead (7). Arranged in the grab at the mounting block is an anchoring means in the form of a rotary tool (1) which is provided with a rotary power drive, is concentric to the shovel axis and is directed towards the bottom, in which arrangement the rotary tool can be a drilling worm or a hook spiral. <IMAGE>

Description

The invention relates to a positively guided diaphragm wall gripper with two gripper blades which can be actuated by rope or hydraulically to open and close by means of a pull-push linkage and which are articulated at the lower end of the gripper frame on a bearing block which is formed from longitudinal stems arranged symmetrically to the gripper axis.

Trench wall grabs are known which are actuated via a cable pull with appropriate reeving and at the same time are guided over the lifting and lowering rope. The required contact pressure when digging the blades comes from the relatively heavy diaphragm wall gripper weight. The gripper frame or gripper body is usually designed as a steel framework with longitudinal struts and many transverse stripes similar to bulkheads and has approximately the geometric width of the slot, a length which is measured slightly less than the Mab horizontally across the closed blades and a height of at least twice that Length. In special cases, e.g. B. Rough depths are used to improve the gripper body 3 to 4 times the length.

The body forms a guide against the course of the slot in the Y axis, i. H. transverse to the longitudinal axis of the slot. The body has no guiding function in the X axis. The slot length corresponds to the largest gripping dimension of the blades and is therefore much larger than the length of the body. Deflection rollers offset by 90 ° serve to introduce the lifting and lowering rope into the gripper body, which often prove to be too small in diameter when the gripper is put down and picked up. This is because the ropes are deflected too much and are often so kinked that strand breaks occur.

A rope-guided diaphragm wall gripper from PS 36 15 068 C1 with a guide frame is known which is supported horizontally against the diaphragm walls and is thus intended to give the gripper more directional stability since the diaphragm wall gripper is positively guided during the digging process. The guide frame is also equipped with hydraulically operated pressure plates.

In other diaphragm wall grabs, the digging process is controlled by hydraulic systems, and the gripper is connected to a square telescopic tube for directional stability, and is lowered and lifted into the slot using ropes. The weight of the square tube can be used to activate the bucket digging effect.

A disadvantage of this prior art is that a diaphragm wall gripper with a guide frame can only be used to a limited extent within a slot supported with concrete. With rolling diaphragm walls z. B. in gravel and sand, the horizontal force can not be transferred as a limited area load, since the ground evades similar to a ground breaking process. In addition, the weight of the guide device does not contribute to the activation of the digging effect, but is more or less a dead load, which must also be moved by the lifting device. The grippers with the firmly connected square telescopic tubes are devices that require additional attachment elements for guiding the square tube in addition to the lifting or carrying device. The actual diaphragm wall grab is relatively short and offers no guiding properties. Movements of the excavator boom as a result of load changes are transferred to the square tube and thus to the diaphragm wall grab. In addition, the square tube is telescopic, which results in a certain instability. If you place this square tube on the trench wall grab for ballasting, all the conditions for an unwanted running are met.

• a) Eigengewicht des Greifers minus des Auftriebs in der Stütz­flüssigkeit,
• b) Füllgewicht des Greifers minus des Auftriebs in der Stütz­flüssigkeit,
• c) Strömungswiderstand und Kohäsion zwischen Greiferkörper und Suspension und
• d) eventuell auftretende Verklemmungsreibung zwischen Greifer­körper und Schlitzwand.

In summary, it appears disadvantageous in the state of the art that the diaphragm wall grippers are of heavy construction due to the required contact pressure, and accordingly heavy and large lifting devices and excavators are required in order to achieve an economical digging progress. The required pulling force of the excavator is made up of:

• a) dead weight of the gripper minus the buoyancy in the supporting fluid,
• b) filling weight of the gripper minus the buoyancy in the supporting liquid,
• c) flow resistance and cohesion between gripper body and suspension and
• d) any jamming friction that may occur between the gripper body and the diaphragm wall.

It is also disadvantageous in the prior art that excavations with heavy diaphragm wall grippers tend to run laterally, since the weighted gripper frame arranged above the center of gravity tilts around the point of contact of the gripper blades on the sole and does not lift the diaphragm wall in a straight direction.

The invention is based on the object of creating a positively guided diaphragm wall gripper which avoids the disadvantages listed here and which, with a considerably lighter design, brings about a high contact pressure of the blades on the sole. This is of great importance for good gripper work, because the soil to be excavated is often so solid that a diaphragm wall gripper does not penetrate, even when weighing down with ballast. An economic grave progress cannot be achieved.

• a) der Greiferrahmen aus vier am unteren Rollenblock gabelförmig angesetzten Stielen gebildet ist, die an ihren oberen Enden mittels eines lösbar angeordneten Querhauptes verbunden sind,
• b) an dem Lagerblock mit einem Kraftdrehantrieb versehene, kon­zentrisch zur Schaufelachse, zur Sohle gerichtet ein Veranke­rungsmittel in Form eines Drehwerkzeuges angeordnet ist.

This object is achieved in an inventive manner in that

• a) the gripper frame is formed from four stems which are attached in the form of a fork on the lower roller block and are connected at their upper ends by means of a detachably arranged crosshead,
• b) an anchoring means in the form of a turning tool is arranged on the bearing block with a power rotary drive, concentric to the blade axis and directed towards the sole.

According to expedient embodiments of the invention, the turning tool can be a auger or a hook spiral. When using a auger, the bottom, e.g. B. loosened sand. When the diaphragm wall gripper closes, the solidified floor, which adjoins the loosened one, collapses and a good degree of filling is achieved. When using a hook spiral, the diaphragm wall drill hooks in the ground, e.g. B. Sound firm.

When closing, upward movement is avoided and the blades dig in.

Further developments of the invention according to the invention are that the four stems forming the gripper frame and attached to the lower roller block in the form of a fork are open hollow supports through which the supporting liquid can flow parallel to the gripper axis. The hollow spaces in the stems can also be filled with a filler material that is the same or heavier than steel. It also appears advantageous that the push-pull linkage articulated on the blades and the cable roller carriage on the bearings runs between the stems within the gripper frame, and that the bearing block is releasably connected to the gripper frame, that the crosshead is releasably connected to the stems and the gripper frame after loosening and removing the crosshead is open at the top.

The gripper frame consists essentially of longitudinal stems, solid or hollow spars, which can also be filled with a heavy metal according to the required weight or the desired center of gravity. The blade bearing block is detachably connected to the actual frame and carries either a central bearing or two external bearings for the blades.

The pull-push linkage runs in the middle between the two gripper frame stems; it is articulated at the top via recessed bearings with the cable roller carriage. The crosshead forms the end of the gripper body and at the same time the detachable connection of the frame spars. This makes it possible to be able to remove the pulley slide freely upwards.

As mentioned, a disadvantage of the prior art is that excavations with heavy diaphragm wall grab tend to run laterally. This is due to the fact that the over the heavy point gripper frame tilts unpredictably around the point where the gripper blades rest on the sole and does not lift the diaphragm wall in a straight direction.

It is therefore of particular importance that the diaphragm wall gripper according to the invention is also steerable within certain limits. For this purpose it is provided according to an essential feature that by means of a slide guide arranged transversely to the diaphragm wall course between the roller block and the bearing block and a hydraulic cylinder articulated on the reel block and the bearing block, their axial assignment to one another can be changed transversely to the diaphragm wall course.

With this design, it is possible to laterally shift the bearing block carrying the gripper blades by a few centimeters relative to the gripper body or gripper frame and thereby bring about a change in direction. In addition, according to the invention, the cross-main outer parts can be displaced transversely to the diaphragm wall profile by means of two further slide guides each arranged between the cross-head and the cross-main outer parts, as a result of which an inclined position of the gripper body or gripper frame is avoided or reduced in the event of larger displacements in the area of the gripper blades.

According to an essential further feature of the invention, it is also possible to rotate the bearing block with the gripper blades mounted thereon relative to the gripper body or gripper frame in order to achieve a change in direction and thus to correct the already started progress of the trench wall excavation. This is made possible by the fact that between the roller block and the bearing block there is arranged a track rotary bearing which can be fixed by means of a fixing device which the bearing block can be rotated relative to the former by means of the hydraulic cylinder arranged between the roller block and the bearing block when the slide guide is fixed.

Further advantages of the invention are that the guidance of the diaphragm wall gripper according to the invention is improved in the slot. If the diaphragm wall gripper is stuck, jammed or canted, it can be released under the influence of greater tensile forces.

This is achieved in that external parts are fastened to the crosshead as guide elements directed towards the diaphragm wall with hinges which can be swung downwards in order to give the gripper frame a smaller cross section. In addition, the crosshead outer parts are attached by means of overload protection devices, which break under a certain load or detach from the crosshead.

The guide skids connected to the crosshead and the stems by means of a support linkage at the joints of the gripper frame can be sheared off and the diagonal struts attached to the joint and the swivel joint keep the guide skids spaced from the gripper frame, the diagonal strut being provided with a predetermined breaking point, which at one certain load breaks.

The diaphragm wall gripper is guided within the slot profile through the cross main outer parts and the guide skids. What is essential are the further design features that the transverse main outer parts have flow openings for a liquid, the size of the flow openings being variably reduced by means of flaps; it is provided that the flaps are attached to the crosshead, pivotable hard rubber plates.

• a) Beim Ablassen des Greifers in geschlossenem Zustand in den Schlitzgraben strömt die Stützflüssigkeit an dem relativ schlanken Greiferrahmen vorbei durch die Öffnungen, ohne dabei starke Wirbel oder Turbulenzen zu erzeugen, die zu Aus­brüchen, Auskolkungen sogar zu Einstürzen der Wandung führen können.
• b) Beim Aufziehen des Greifers sind die Verhältnisse ähnlich wie beim Ablassen. Hier wirkt sich weiterhin positiv aus, daß durch die günstigen Strömungsverhältnisse und geringeren Ko­häsionskräfte, die erforderliche Zugkraft zum Aufziehen des Greifers kleiner wird. Unter Beibehaltung der Baggerzugkraft ist dann eine Lastverschiebung zu Gunsten des Greifer-Eigen­gewichts möglich, was sich günstig auf den Grabeffekt der Greiferschaufeln auswirkt.
• c) Beim Schließvorgang der Schaufeln bewegt sich der Greiferrah­men zum Teil geringfügig nach oben, etwa nur mit einem Fünf­tel der eigentlichen Hubgeschwindigkeit beim Aufziehen. In dieser Phase sind die Öffnungen noch verschlossen, so daß eine geringe Flüssigkeitsauflast wirksam ist und sich positiv auf den Grabeffekt der Schaufeln auswirkt. Sobald der Schließvorgang beendet ist, hebt sich der Greifer ohne Pause mit einer wesentlich höheren Geschwindigkeit von der Sohle ab. Der größere Strömungsdruck öffnet ganz zwangsläufig die Klappen oder andere Verschlußelemente, die Stützflüssigkeit kann wieder frei ohne Staudruck und Turbulenzen am Greifer­körper vorbei strömen.

The following effects are achieved:

• a) When the gripper is lowered into the slot trench in the closed state, the support fluid flows past the relatively slim gripper frame through the openings without generating strong eddies or turbulence, which can lead to eruptions, scourings and even collapse of the wall.
• b) When opening the gripper, the conditions are similar to when lowering. This has a positive effect that the favorable flow conditions and lower cohesive forces mean that the tensile force required to open the gripper becomes smaller. While maintaining the excavator traction, a load shift in favor of the grab weight is possible, which has a favorable effect on the digging effect of the grab buckets.
• c) During the closing process of the blades, the gripper frame sometimes moves slightly upwards, for example only at a fifth of the actual lifting speed when opening. In this phase, the openings are still closed, so that a low liquid load is effective and has a positive effect on the digging effect of the blades. As soon as the closing process is finished, the gripper lifts off the sole at a much higher speed without a break. The greater flow pressure inevitably opens the flaps or other closure elements, the support fluid can flow freely past the gripper body without back pressure and turbulence.

When working in a slot filled with a supporting liquid, the flow resistance created when the diaphragm wall gripper is lifted is approx. 30 to 50 KN, which is caused by the Openings is significantly reduced. The installation of flaps, in particular hard rubber plates in the throughflow openings causes a liquid load when digging the gripper blades.

A further embodiment of the invention is that the crosshead for the cable inlet guide has a trumpet-shaped guide cuff.

This guide sleeve serves to protect the lifting and lowering rope when threading into the hook body. The guide cuff is shaped in such a way that a tension-resistant connection that can be acted upon with great force can be produced with a catching device consisting of the catching rod tube and the catching pawls in the event of a broken rope or a gripper jamming.

The design characterized by the described features is simple in its structure and, due to its disassemblability, is also easy to dismantle and assemble. These properties are very important for practical construction site operation. In addition, the features of the invention make it possible to shape the gripper body or gripper frame in a streamlined manner and to set the center of gravity as low as possible. The fact that it can be dismantled also makes it possible to extend the gripper frame on the construction site using simple means and corresponding additional elements based on the modular system.

It is also essential according to the invention that the cable roller carriage is freely removable upwards from the gripper frame and that the bearing points of the pull-push linkage are sunk between the gripper frame bars on the cable roller carriage.

The features of the invention also create a diaphragm wall grab that is considerably lighter in weight than comparable designs, and which is nevertheless able to achieve maximum digging progress because it offers the possibility of the ground in front of the ground by means of the rotary drive arranged centrally in the center of the bucket using a auger or hook spiral to loosen the actual digging process or to generate an additional load in the case of firmer ground formations.

As a result of its low weight and the additional load that can be achieved, as well as the streamlined design, lower tractive forces are required, and conventional lifting equipment (excavators) can therefore be used.

Further features and special features of the invention can be found in the exemplary embodiments which are illustrated in the drawing.

• Fig. 1 den oberen Teil eines Greifergestells mit Querhaupt und Außenteilen in Vorderansicht,
• Fig. 2 das Querhaupt mit Außenteilen in Draufsicht,
• Fig. 3 das Querhaupt wie in Fig. 2, jedoch mit zusätzlichen Außenteilen für Kreuzschlitz-Formen,
• Fig. 4 die Greiferschaufeln mit Kraftdrehantrieb und Dreh­werkzeug in Vorderansicht,
• Fig. 4a das Drehwerkzeug, als Hakenspirale ausgeführt,
• Fig. 5 die Greiferschaufeln wie in Fig. 4 und den oberen Teil des dazugehörenden Greiferrahmens in Seitenansicht,
• Fig. 6 einen Schlitzwandgreifer mit Leitkufen in Vorderan­sicht,
• Fig. 7 den Schlitzwandgreifer wie in Fig. 6 in Draufsicht,
• Fig. 8, 9 und 11 verschiedene Schlitzwandgreifer bei der Auf- und Abwärtsbewegung im Schlitz in Seitenansicht,
• Fig. 10 Schlitzwandgreifer mit Rahmenverlängerung,
• Fig. 12 bis 14 den Schlitzwandgreifer in anderen Ausführungen.

Show it

• 1 shows the upper part of a gripper frame with crosshead and outer parts in front view,
• 2 the crosshead with outer parts in plan view,
• 3 shows the crosshead as in FIG. 2, but with additional outer parts for cross-slot shapes,
• 4 the gripper blades with power rotary drive and turning tool in front view,
• 4a the turning tool, designed as a hook spiral,
• 5 shows the gripper blades as in FIG. 4 and the upper part of the associated gripper frame in a side view,
• 6 shows a diaphragm wall gripper with guide skids in a front view,
• 7 is a top view of the diaphragm wall gripper as in FIG. 6,
• 8, 9 and 11 different diaphragm wall grippers in the up and down movement in the slot in side view,
• 10 diaphragm wall grab with frame extension,
• Fig. 12 to 14 the diaphragm wall gripper in other versions.

The cable-guided diaphragm wall grab, which is suspended or suspended by means of a telescopic hollow rod, is provided with a turning tool mounted concentrically to the blade axis. The turning tool consists of the rotary drive 2 accommodated in the bearing block 4 for the gripper blades 17 and a screw auger 1 serving to loosen the slot sole or a hook spiral 1a serving to hook the slot sole. The chisels 24 are fastened to the gripper blades 17. The longitudinal stems 3, which form the gripper frame 25 and are designed as frame bars, are hollow or solid or are filled with a heavy metal in accordance with the required weight or the desired center of gravity. The bearing block 4 releasably connected to the cable pulley block 23 carries either a central bearing 5 or two outer bearings 5a for the gripper blades 17. The pull-push linkage 6 acting on the blades 17 runs centrally between the stems 3 forming the gripper frame 25. It is articulated at the top by means of recessed bearings 16 with the cable roller carriage 8 connected. If the crosshead 7 is detached from the handles 3, the cable roller carriage 8 can be removed freely upwards. To protect the lifting and lowering rope when threading in the crosshead 7, a guide cuff 9 is installed. The guide cuff 9 is shaped so that a traction-resistant connection that can be acted upon with great force can be produced with a catching device consisting of the catching rod tube 10 and the catching blades 11 in the event of a cable break or jamming of the diaphragm wall gripper. The cross main outer parts 7a in Fig. 1 serve to guide the diaphragm wall gripper within the slot profile and are equipped with joints 12 and predetermined breaking elements 13 so that they fold down in the event of tension or jamming of the diaphragm wall gripper using large tensile forces and thus the diaphragm wall gripper a smaller shape give.

In a manner similar to the transverse main outer parts 7a in FIG. 1, the guide skid 18 shown on the right-hand diaphragm wall in FIG. 6 with the articulated support linkage 19 and the diagonal strut 20 serves to guide the diaphragm wall gripper by, as shown on the left diaphragm wall, in the event of an overload The predetermined breaking point 21 is separated and the guide skids 18 fold in. The gripper frame 25 is connected to the support linkage 19 by means of a joint 12, which is fastened to the guide skid 18 with a pivot bearing 22.

• a) Beim Ablassen des geschlossenen Greifers in den Schlitzgra­ben sind die Klappen 15 durch den Staudruck der Stutzflüssigkeit geöffnet. Die Stützflüssigkeit strömt an dem Greiferrahmen vor­bei durch die Durchströmöffnungen 14, ohne dabei starke Wirbel oder Turbulenzen zu erzeugen, die zu Ausbrüchen, Auskolkungen oder sogar zu Einstürzen der Wandung führen können.
• b) Beim Aufziehen des Greifers sind die Verhältnisse ähnlich wie beim Ablassen. Die Klappen 15 sind durch den Staudruck der Stützflüssigkeit geöffnet, der Strömungswiderstand des Greifers wird verringert und unter Beibehaltung der maximalen Baggerzug­kraft ist eine Lastverschiebung zugunsten des Greifereigenge­wichtes möglich, was sich günstig auf den Grabeffekt der Schau­feln auswirkt.
• c) Beim Schließvorgang der Greiferschaufeln 17 bewegt sich der Greiferrahmen 25 geringfügig nach oben. Ein seilgeführter Schlitzwandgreifer hebt sich aufgrund der Seilrollenübersetzung mit etwa einem Fünftel der eigentlichen Hubgeschwindigkeit beim Aufziehen nach oben. Der Staudruck der Stützflüssigkeit ist zu gering, die Klappen 15 zu öffnen. Die auf den geschlossenen Klappen 15 wirkende Flüssigkeitsauf last wirkt sich positiv auf den Grabeffekt der Schaufeln aus. Sobald der Schließvorgang be­endet ist, hebt sich der Greifer ohne Pause mit einer wesentlich höheren Geschwindigkeit von der Sohle ab. Der Staudruck öffnet die Klappen 15 und der Greifer wird aufgezogen.

The transverse main outer parts 7a have flow openings 14, the cross section of which can be changed by means of flaps 15 or other elements. When working in a trench filled with a supporting liquid, for example a suspension or concrete, the following effects are achieved:

• a) When the closed gripper is lowered into the slot trench, the flaps 15 are opened by the dynamic pressure of the supporting liquid. The supporting fluid flows past the gripper frame through the throughflow openings 14 without generating strong eddies or turbulence, which can lead to breakouts, scourings or even collapse of the wall.
• b) When opening the gripper, the conditions are similar to when lowering. The flaps 15 are opened by the back pressure of the supporting liquid, the flow resistance of the gripper is reduced and, while maintaining the maximum excavator traction, a load shift in favor of the gripper's own weight is possible, which has a favorable effect on the digging effect of the blades.
• c) When the gripper blades 17 close, the gripper frame 25 moves slightly upwards. A cable-guided diaphragm wall grab lifts upwards at around a fifth of the actual lifting speed due to the pulley ratio. The back pressure of the supporting fluid is too low to open the flaps 15. The liquid load acting on the closed flaps 15 has a positive effect on the digging effect of the blades. As soon as the closing process is finished, the gripper lifts off the sole at a much higher speed without a break. The dynamic pressure opens the flaps 15 and the gripper is pulled up.

8 to 11 illustrate some possible variations. In FIG. 8 the closed gripper is shown during the upward or downward movement within the slot. 9 shows an open gripper with the auger screwed into the sole in the digging state. In Fig. 10 is a gripper as in Fig. 8 but with gripper frame extension and additional Cross main outer parts shown for better guidance at particularly large slot depths. 11 shows a diaphragm wall gripper with guide runners 18 in the closed state.

An additional equipment of the diaphragm wall grab according to the invention is shown in FIG. This consists of a lower slide guide 27 arranged between the roller block 23 and the bearing block 4 for the gripper blades 17 transversely to the diaphragm wall course and a hydraulic cylinder 26 articulated on the roller block 23 and on the bearing block 4. Appropriate loading of the hydraulic cylinder 26 now makes the position of the bearing block 4 Gripper frame 25 changed in the transverse direction to the course of the diaphragm wall, so that the bearing block 4 with the blades 17 is off-center and thereby a change in direction of the digging process is brought about. In this way, the diaphragm wall grab is directional.

In addition, as can also be seen from FIG. 12, it is also possible to arrange an upper slide guide 28 on both sides between the crosshead 7 and the two crosshead outer parts 7a, so that the crosshead outer parts 7a are adjustable relative to the crosshead 7 transversely to the diaphragm wall profile. With this measure, the direction correction course of the diaphragm wall gripper can be improved. The upper slide guides 28 can also — not shown — be mounted so as to be transversely displaceable relative to the gripper frame 25 via sliding bearings.

Claims (24)

1. Forcibly guided diaphragm wall gripper with two gripper blades which can be actuated by rope or hydraulically to open and close by means of a pull-push linkage and which are articulated at the lower end of the gripper frame to a bearing block which is formed from longitudinal stems arranged symmetrically to the gripper axis,
characterized in that a) the gripper frame is formed from four stems (3) attached to the lower roller block (23) and which are connected at their upper ends by means of a detachably arranged crosshead (7), b) an anchoring means in the form of a turning tool (1) is arranged on the bearing block (4), provided with a power rotary drive (2), concentric to the blade axis and directed towards the sole. 2. diaphragm wall grab according to claim 1, characterized in that the turning tool is a auger. 3. diaphragm wall grab according to claim 1, characterized in that the turning tool is a hook spiral. 4. diaphragm wall grab according to claim 1, characterized in that the stems (3) are open, parallel to the gripper axis of a supporting liquid freely flowable profiles. 5. diaphragm wall grab according to claim 4, characterized in that the stems (3) are solid or hollow and can be filled with filler material equal or heavier than steel. 6. diaphragm wall grab according to claim 1, characterized in that the on the blades (17) and the cable roller carriage (8) on the bearings (16) articulated pull-push linkage between the handles (3) within the gripper frame. 7. diaphragm wall grab according to claim 1, characterized in that the bearing block (4) is detachably connected to the gripper frame (25). 8. diaphragm wall grab according to claim 1, characterized in that the crosshead (7) is detachably connected to the handles (3) and the gripper frame (25) after loosening and removing the crosshead (7) is open at the top. 9. diaphragm wall gripper according to claim 1, characterized in that on the crosshead (7) outer parts (7a) as the diaphragm wall (W) directed guide elements with hinges (12) are fastened downwards. 10. diaphragm wall grab according to claim 1, characterized in that by means of a roller block (23) and bearing block (4) arranged transversely to the diaphragm wall slide guide (27) and a roller block (23) and bearing block (4) articulated hydraulic cylinder (26) whose axial Assignment to one another can be changed transversely to the diaphragm wall profile. 11. diaphragm wall gripper according to claims 8 and 9, characterized in that by means of one each between the crosshead (7) and the transverse main outer parts (7a) arranged upper slide guide (28), the transverse main outer parts (7a) with respect to the crosshead (7) displaceable transversely to the diaphragm wall are. 12. diaphragm wall gripper according to claims 1 and 10, characterized in that between the roller block (23) and the bearing block (4) is arranged by means of a fixing device track rotary bearing, by means of which the bearing block (4) by means of between the roller block (23rd ) and bearing block (4) arranged hydraulic cylinder (26) with fixed lower slide guide (27) the latter can be rotated relative to the former. 13. diaphragm wall grab according to claim 9, characterized in that the outer parts (7 a) are attached to the overload protection devices (13) which break under a certain load or detach from the crosshead (7). 14. diaphragm wall grab according to claim 1, characterized in that on the crosshead (7) and the stems (3) guide skids (18) by means of a support rod (19) are connected to some of the joints (12). 15. diaphragm wall grab according to claim 14, characterized in that the guide runners (18) by means of the support linkage (19), and the swivel joints (22) are connected to the gripper frame (25) and can be sheared off and that at some of the joints (12) and one of the swivel joints (22) fastened diagonal strut (20) keeps the guide runners (18) at a distance from the gripper frame (25). 16. diaphragm wall grab according to claim 15, characterized in that the diagonal strut (20) is provided with a predetermined breaking point (21) which breaks at a certain load. 17. trench wall grab according to claim 9 or 14, characterized in that the guide elements in the form of the outer parts (7a) or the guide runners (18) are arranged in the transverse direction to the slot. 18. diaphragm wall gripper according to claim 1, characterized in that the transverse main outer parts (7a) have flow openings (14) for a liquid. 19. diaphragm wall grab according to claim 18, characterized in that the size of the flow openings (14) by means of flaps (15) can be variably reduced. 20. diaphragm wall grab according to claim 19, characterized in that the flaps (15) on the crosshead (7) are attached, pivotable hard rubber plates. 21. diaphragm wall grab according to claim 1, characterized in that the crosshead (7) for the cable inlet guide has a trumpet-shaped guide cuff (9). 22 diaphragm wall grab according to claim 21, characterized in that by means of the catch rod (10) arranged catch pawls (11) by centrally inserting the catch rod tube (10) into the guide sleeve (9) a pull and lock connection can be established. 23. diaphragm wall grab according to claim 1, characterized in that the cable roller carriage (8) upwards from the gripper frame (3) is freely removable. 24. diaphragm wall grab according to claim 1, characterized in that on the cable roller carriage (8) the bearing points (16) of the tension-push rod (6) are sunk between the gripper frame spars (3).

Images