ES2929747T3 - Diaphragm wall spoon and procedure for making a trench in the ground - Google Patents

Abstract

The invention relates to a trench wall scoop and to a method of creating a trench in soil, using a trench wall scoop having a scoop frame at the lower end of which are arranged two scoop scoops that can be Adjusting between an open position and a closed position by means of an actuation device, the Grab blades grab the material from the ground and collect it in the closed position. According to the invention, it is provided that a measuring device is used to determine a distance and/or a pressure when the gripping blades are closed, and that the measuring device transmits the determined measured values to a control unit, which It is designed to make a statement on the basis of the measured values determined by the measuring device for striking the ground material. (Automatic translation with Google Translate, without legal value)

Description

DESCRIPTION

Diaphragm wall spoon and procedure for making a trench in the ground

The invention relates to a slurry bucket for trenching in the ground, with a bucket frame, bucket blades mounted thereon which can be adjusted between an open position and a closed position in which the scoop is collected. soil material and a drive device which is configured to adjust the bucket blades between the open position and the closed position, according to the preamble of claim 1.

The invention also relates to a method for making a trench in the ground, where a diaphragm wall scoop is used comprising a scoop frame at the lower end of which are arranged two scoop blades that can be adjusted between an open position and a closed position by means of a drive device, the bucket blades grab the soil material and receive it in a closed position, according to the preamble of claim 10.

A generic type diaphragm wall grab is derived from the documents EP 1950353 B1 and JP 2007 327334 A. Devices of this type are used for demolding casts or trenches in the ground, which are mainly necessary to make so-called walls. screen, containment or sealing on the ground. The slurry wall ladle is typically lowered to the ground with the ladle blades open, the ladle blades penetrating into the top of the soil. By closing the scoop blades, the soil material is grabbed and collected in the slurry wall scoop with the scoop blades closed. The filled slurry wall ladle is then removed from

the ditch and moves to a place of emptying. A new gripping process is then carried out until the desired final trench depth is reached.

Trenches for retaining or sealing walls can reach depths of up to 50 m or more. The cross section of the trench created with the slurry wall scoop is in the range of approximately 1 m wide and 1.5 to 3 m long. Due to this trench cross section and typical trench depths, there is often no chance for the bucket operator to be able to see the bottom of the trench, especially when the trench is filled with a slurry.

For the effective operation of a slurry wall grab, it is desirable to have information about the soil material to be worked. This is especially true when penetrating a soil with different soil layers in the case of a greater trench depth.

The invention is based on the object of providing a slurry wall grab and a method for trenching in the ground, with which a particularly efficient operation of a slurry wall grab is made possible.

According to the invention, this object is achieved, on the one hand, by a diaphragm wall slot having the features of claim 1 and, on the other hand, by a method having the features of claim 10. Preferred embodiments of the invention are given in the corresponding dependent claims.

The diaphragm wall grab according to the invention is characterized in that a measuring device is provided, which is configured to determine a path and/or a pressure when the grab blades are closed, and in that, in order to transmit the determined measured values, the measuring device is connected to a control unit, which is configured to make an estimate about the soil material on the basis of the measurement values determined by the measuring device.

A basic idea of the invention consists in detecting and evaluating a penetration of the bucket blades into the ground and/or closing into the ground. According to the invention, a measuring device is provided which is configured to determine a displacement and/or a pressure during closing of the bucket blades. If, for example, it digs in and closes relatively easily, this may be an indication of a loose soil layer, such as a layer of gravel or sand.

If penetration or closure is difficult, this can be seen as an indication of a firmer soil layer or even an obstruction at the bottom of the trench.

According to another aspect of the invention, a control unit is provided which is in communication with the measuring device and which evaluates the determined measured values. The control unit can make an estimate on the soil material on the basis of the measured values. In addition, other measured values of other components of the trench wall grabber can be transmitted to the control unit, which allow, for example, an estimate to be made about the current height position of the bucket of the trench wall. the ditch.

With this information, effective handling is considerably easier for the operator of a diaphragm wall grab. For example, you can set a drop height with the slurry wall spoon and therefore a force with which to drive the slurry wall spoon into the ground. For example, comparison with data from a previous scoop operation can also detect at an early stage if there is a layer of rock or an obstacle. In this case, it can be decided, based on the information available about the existing soil, whether, if necessary, it makes sense to use, at least temporarily, another soil removal tool, such as a chisel. diaphragm wall to break the rock, in order to achieve a greater effective advance of the diaphragm wall.

According to the invention, the control unit comprises a database in which the known measured values for certain types of soil are stored. On the basis of a determined penetration trajectory or a closing speed or a stress, which are recorded by the measuring device, the estimation on the type of soil, for example sand, gravel, clay or rock, can be made. directly by the control unit from the stored data.

[According to a further development of the diaphragm grab according to the invention, it is advantageous if the measuring device is configured to record the course of the measured values over time and/or over a current trench depth . This makes it possible to record additional information about the structure of the soil or the presence of an obstacle. For example, it can be determined that there may be a top layer of loose soil material, while immediately below is a soil layer with firmer soil material. The same is true of reverse soil stratification. This information can also be used for the back grab step and/or when grabbing adjacent trenches to make the excavation process as efficient as possible.

According to a particular embodiment variant of the invention, it is advantageous if the control unit can indicate that an obstacle, in particular an erratic block, has been caught by blades of the bucket. This can be determined, in particular, by noting that the bucket blades cannot be closed or cannot be closed completely. The presence of a boulder or other obstacle may require a modification or even interruption of the process, such as the use of a different device to remove the soil. In addition, the slurry bucket can be dropped from a greater height to break the obstacle with the bucket blades open.

The measuring device is provided with corresponding sensors, such as displacement transducers or pressure sensors. According to one embodiment of the invention, it is particularly useful if the measured values can be recorded individually for each bucket blade. For example, an asymmetric closing of the bucket blades can be determined. It is particularly advantageous if the control unit can determine the size and position of the obstacle in the trench. Information about the size and location of the obstruction in the trench is useful for its removal.

In principle, the bucket blades can be actuated in any way desired by means of corresponding actuators. It can also be a drive by drive cables. According to a development of the invention, it is particularly preferred if the drive device has at least one drive cylinder. It can be a central drive cylinder for both bucket blades or one or more drive cylinders for each of the bucket blades. The drive cylinders work in particular hydraulically.

The measurement device, which can comprise several measurement sensors or transducers, can be arranged at any point or at several points of the diaphragm wall spoon.

According to a further development of the invention, it is particularly expedient if the measuring device is arranged on the at least one drive cylinder. Here, in particular, a pressure in the drive cylinder can be recorded as a measure of the necessary force and/or a stroke of a piston in the drive cylinder. The path provides information about the closure and the position of the bucket blades.

A preferred embodiment of the invention is that the bucket blades are pivotally mounted on swivels, that the sensors of the measuring device are provided on the swivels and that the sensors are designed to detect forces and/or a angle of rotation of the bucket blades. The sensors can in particular be force-measuring sensors and/or sensors for recording an adjustment position or the adjustment angle of the bucket blades. With these values, in particular, an estimate can be made whether there is a load or an asymmetric opening of the bucket blades. This, in turn, allows conclusions to be drawn about the shape and arrangement of an obstacle, especially a rock.

The invention further comprises a slurry wall spoon device having a slurry wall spoon formed in accordance with the invention described above. In this case, provision is made for the diaphragm wall spoon to be mounted in a carrier device so that it can be adjusted vertically. The carrier device can comprise, in particular, a mobile lower carriage, preferably a tracked lower carriage, and an upper carriage that can preferably rotate on the former. A mast is preferably arranged on the upper carriage, along along which is mounted a diaphragm wall scoop that can be adjusted vertically by means of a cable suspension or a rigid drive rod.

The method according to the invention is characterized in that a distance and/or a pressure is determined by means of a measuring device when the gripping blade is closed and that the measuring device sends the determined measured values to a control unit , which is designed to make an estimate about the soil material based on the measurement values determined by the measuring device.

The method according to the invention can be carried out in particular with the diaphragm ladle described above. Hereby the advantages described above can be achieved.

A preferred method variant of the invention is that the trench is filled with a slurry during or after excavation, and that the slurry hardens in the trench and produces a diaphragm wall segment. Thus, a diaphragm wall can be produced by correspondingly repetitive production of an adjacent or overlapping diaphragm wall segment. The trench wall can serve, in particular, as a support and/or sealing wall.

The invention is described below with reference to preferred embodiments, which are shown schematically in the drawings.

Shown in the drawings:

Fig. 1 a side view of a diaphragm wall grab device according to the invention and

Fig. 2 a partial cross-sectional view of a diaphragm wall spoon according to the invention.

According to Fig. 1, a slurry wall spoon device 10 according to the invention comprises a carrier device 12 with a slurry wall spoon 20 attached thereto. The carrier device 12 has a track system 11 and a superstructure 13 rotatably mounted on it in an essentially known manner. An approximately vertically oriented mast 14 with a mast head 15 is hinged to the superstructure 13. The diaphragm wall scoop 20 is vertically adjustable and is connected to the carrier device 12 with the mast 14 via a supporting cable 16. Hydraulic power is supplied via a power line 18. In addition, a power and data supply line may be provided.

The diaphragm wall scoop 20 has a scoop frame 22 in the form of a box. A retaining device 40 is arranged at its top, to which one end of the supporting rope 16 is attached. The bucket blades 24 are mounted on a lower end of the bucket frame 22. The guide elements in the form of plate 26 are adjustablely mounted along the bucket frame 22 to control their position.

In Fig. 2, the structure of a bulkhead bucket 20 is shown in more detail. A drive device 30 for the lower bucket blades 24 is arranged in a central area of the bucket frame 22 constructed in the shape of a scaffold. The drive device 30 comprises a drive cylinder 32 that is actuated hydraulically and in which is mounted a piston rod 34 that can be moved downwards. The hydraulic drive cylinder 32 receives hydraulic power from the transport device 12 through the supply conduit 18 (not shown in Fig. 2).

A lower end of the piston rod 34 is hinged to a carriage element 36, which can be moved linearly, driven along the bucket frame 22. Two levers 38 are hinged to the carriage element 36, each lever 38 it is hinged to a bucket blade 24. The bucket blades 24 themselves are hinged to a lower end of the bucket frame 22.

By retracting the rod 34 on the drive cylinder 32, the carriage member 36 is moved upwards, whereupon the bucket blades 24 are moved via the levers 38 to an open position to pick up the material from the ground. . By means of the downward extension of the piston rod 34, the carriage element 36 is moved downwards along the linear guide, thus pushing the levers 38 and the bucket blades 24 into a closed position in which a material of seized soil is trapped between the blades of the bucket 24.

According to the invention, a measuring device is provided which is not shown in more detail in the figures and which is arranged in particular on the drive device 30 and preferably on the drive cylinder 32. The measuring device is configured to determine a extension path of the rod 34 and a pressure on the drive cylinder 32 when closing the bucket blades 24. This can be used to determine when the bucket blades 24 grab an obstacle 8, such as a rock, when closing. In this case, the measuring device can determine that despite an increase in pressure in the actuating cylinder 32, which has an effect on both sides, the stroke of the piston rod 34 no longer varies and thus , of the sliding element 36. This state, which can be detected by the measuring device, can be used by a control unit, which is also not shown, as an indication of the presence of an obstacle.

The control unit can preferably be arranged on the carrier device 12. The measurement values determined by the measurement device can be transmitted to the control unit via the supply line 18 or via a wireless connection. The control unit can then make an estimate about the presence of an obstacle or also about the present ground material on the basis of the obtained measurement values. The information thus determined can be communicated, for example, via a monitor, to an operator of the superstructure 13 of the carrier device 12 or to a remote control center.

Based on the opening angle of the bucket blades 24 when an obstacle 8 is detected, the control unit can also make an estimate about the size of the obstacle 8.

If the bucket blades 24 are driven by separate drive cylinders 32, for example, it can be detected whether the bucket blades 24 can be closed with different degrees of closure. From this, the control unit can also make an estimate about the position of the obstacle.

Claims (11)

1. Diaphragm wall spoon to make a trench in the ground, with - a bucket frame (22), - coupled bucket blades (24) which can be adjusted between an open position and a closed position to grip the soil material, in which the soil material is picked up, and - a drive device (30) that is configured to move the bucket blades (24) between the open position and the closed position, wherein a measuring device is provided, which is configured to determine a path and/or a pressure during the closing of the bucket blades (24), wherein for the transmission of the determined measurement values, the measurement unit is connected to a control unit that is configured to establish, from the measurement values determined by the measurement device, an estimate about the soil material , Y wherein the control unit comprises a data bank in which known measurement values of certain types of soil are stored. 2. A diaphragm wall spoon according to claim 1, characterized because the measuring device is configured to record the course of the development of the measured values over time and/or at a current trench depth. Diaphragm wall scoop according to one of claims 1 to 2, characterized because by means of the control unit it can be signaled that the bucket blades (24) have collided with an obstacle (8), in particular with an erratic block. Diaphragm wall scoop according to one of claims 1 to 3, characterized because the measurement values for each bucket blade (24) can be recorded individually. 5. Diaphragm wall spoon according to claims 3 or 4, characterized because by means of the control unit information about the size and/or position of the obstacle (8) in the trench can be determined. 6. Diaphragm wall spoon according to any one of claims 1 to 5, characterized in that the drive device (30) comprises at least one drive cylinder (32). 7. Diaphragm wall spoon according to claim 6, characterized in that the measuring device is arranged on the at least one drive cylinder (32). 8. Diaphragm wall spoon according to any one of claims 1 to 7, characterized because the bucket blades (24) are pivotally mounted on swivels, because sensors of the measuring device are provided on the swivels, and because the sensors are designed to detect forces and/or an angle of pivoting of the bucket blades (24). Slurry wall spoon device with a slurry wall spoon (20) according to one of Claims 1 to 8, characterized in that the diaphragm wall spoon (20) is mounted on a carrier device (12) in such a way that it can be adjusted vertically. A method for making a trench in the ground, in particular with a diaphragm grab (20) according to one of claims 1 to 8 or a diaphragm grab device (10) according to claim 9, wherein uses a diaphragm wall grab (20) that has a grab frame (22) at the lower end of which are arranged two grab blades (24) that can be moved between an open position and a closed position by means of a device drive (30), where the bucket blades (24) grab material from the ground and collect it in the closed position, where - by means of a measuring device, it is possible to determine a path and/or a pressure during the closing of the bucket blades (24) and - wherein the measured values determined by the measuring device are sent to a control unit with a data bank, in which known measured values of certain types of soil are stored, which it is configured to establish, from from the measurement values determined by the measuring device, an estimate about the soil material. The method according to claim 10, characterized because the trench is filled with a suspension, either during or after its creation and because the suspension is hardened in the trench and a diaphragm wall segment is built.