JP2007146642A - Trench wall device and method for forming groove in soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a groove by effectively lowering a soil working device in soil through use of a trench wall device. <P>SOLUTION: The trench wall device is provided with the ground working device including a frame which has a means for removing an exposed ground at a bottom part and a means for lowering the ground working device in the ground at least in an almost vertical direction. For achieving this object, at least one gyroscope for judging a rotating position of the ground working device relative to a vertical axis is provided, and a method for forming the groove in the ground by the trench wall device is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a trench wall device and a method of forming a groove in soil, and in particular, to form a trench in a trench wall device according to the premise of claim 1 and soil according to the premise of claim 10. Regarding the method.

  A trench wall device related to the present invention is known, for example, in Patent Document 1. This publication, on the one hand, discloses a trench wall grab with a grab shovel at the bottom of the frame, and on the other hand, four cutting wheels set at the bottom of the frame, which are set to rotate to remove exposed soil. Disclosed is a trench wall cutter provided.

  When the trench wall device is lowered into the soil, a substantially square groove having a rectangular cross section is formed in the soil. The trench (groove) wall can be finished by filling the groove with at least one of the supporting liquid or suspension and curing at least one of the supporting liquid or suspension. The exposed soil can also be used for the formation of trench wall elements.

  In order to form a large trench wall, the trench wall device is lowered, pulled out and lowered again at adjacent, particularly overlapping positions. Each time the trench wall device is lowered, one trench wall section (panel) is formed, and the trench wall sections overlap each other to form the entire trench wall. A guide frame can be provided on the soil surface, that is, on the ground as a guide device for the trench wall device when forming the trench wall section.

European Patent Application No. 0903443A2

  However, in the operation of known trench wall devices, the resulting trench wall strength may not be suitable for all purposes, especially when soil geology changes.

  It is an object of the present invention to provide a wrench wall device and a method for forming grooves in soil that allow the formation of trench walls having particularly high quality.

  This object is solved according to the invention by a trench wall device having the features of claim 1 and a method for forming grooves in the soil having the features of claim 10. Preferred embodiments emerge from the dependent claims.

  The trench wall device according to the present invention includes a soil working device including a frame in which means for removing exposed soil is provided at the bottom, and means for lowering the soil working device into the soil substantially parallel to the vertical axis direction. I have.

  In the method for forming grooves in the soil according to the present invention, the means for removing the exposed soil provided at the bottom of the frame of the soil working device is activated, and the soil working device is lowered into the soil in parallel to the vertical axis direction. .

  The trench wall device according to the present invention is characterized in that at least one measuring device, particularly a gyroscope, for determining the rotational position of the soil working device around the vertical axis is provided.

  The basic principle of the present invention is that the poor quality of the trench wall that can be observed in some cases is that the soil work device rotates around the vertical axis while the soil work device is descending through the soil. Based on the fact that This rotation around the vertical axis is caused by the fact that the hardness of the exposed soil changes along the removal cross-section, for example when hitting stone gravel, so that the soil implement is being removed during soil removal. Deviate from the correct position. In such a case, the trench wall device is not square but rather forms a twisted spiral groove. As a result, even if the adjacent trench wall sections are correctly positioned relative to each other on the soil surface, i.e. the ground surface, they no longer optimally meet each other deeper and no longer optimally overlap, and in some cases the finished Trench wall leakage may occur.

  The gyroscope according to the present invention can detect the rotation of the soil working device around the vertical axis. When such a rotation occurs, for example, the soil work process can be interrupted and the cause of the rotation can be eliminated. For example, exposed stone gravel can be recovered from the soil. However, means for automatically preventing undesired rotation about the vertical axis can also be provided. In this embodiment, a particularly well-shaped groove can be formed.

  In addition, the present invention allows the tight inclination of the frame in the groove due to the rotation of the soil working device around the vertical axis to be signaled sufficiently in advance to increase the reliability during trench wall formation. Become.

  Preferably, the trench wall device according to the invention serves to form a groove having at least a substantially rectangular cross section. In this case, a cross section is understood as a plane perpendicular to the vertical axis. For this purpose, it is appropriate to have at least a substantially rectangular removal cross section for the means for removing the exposed soil. In principle, other removal cross sections may be provided.

  Preferably, the trench wall device is configured as a trench wall cutter or a trench wall grab. In trench wall grabs, the means for removing exposed soil includes shovel elements, in particular twin shovel grabs. In the trench wall cutter according to the invention, the means for removing the exposed soil includes a rotationally driven cutting wheel. Preferably, four cutting wheels are provided, and two of them are arranged as a plurality of pairs around the rotation axis. In the most preferred example, the plurality of pairs of cutting wheels align the plurality of cutting wheels with the axes of rotation of the plurality of cutting wheels parallel and are placed directly adjacent to each other.

  The means for lowering the soil work device is preferably based on gravity. This means that the soil handling device penetrates the soil as a result of its moderate weight. Equipment for additional feeding means for pressing the soil work device against the soil can also be provided.

  In order to enable extremely rapid and reliable trench wall formation, at least one actuator for rotating the soil working device around a vertical axis is provided and to automatically control the rotational position of the soil working device In addition, it is advantageous to provide a control device in signal connection with the actuator and at least one gyroscope. Here, in practice, rotation about the vertical axis is not only observed, but possibly manually prevented. On the other hand, a control device is provided and acts on the rotation of the soil working device according to the signal supplied by the gyroscope. More particularly, the control device can be configured to maintain the rotational position of the soil working device about a vertical axis. In principle, a control device can also be provided for selective rotation of the soil working device along the working depth.

  At least one actuator has a control surface disposed on the frame, the control surface being displaced from a retracted first position to a second position protruding to resist an inner wall of the formed groove. Therefore, a trench wall device having a particularly simple configuration can be achieved. By means of this control surface, the frame can be pushed away from the inner wall of the groove and, as a result, the soil working device can be selectively rotated about a vertical axis. Once the rotation is complete, the control surface can be displaced again to the retracted first position. In the retracted position, the control surface is preferably arranged as the same as the outer contour of the frame or is shifted backwards from the outer contour of the frame towards the inside of the frame. In the protruding second position, the control surface preferably protrudes from the outer contour of the frame. This control surface can in particular be provided on a control flap hinged to the frame. In order to move the control surface, the actuator can comprise, for example, a fluid cylinder. In order to achieve a stable rotation around the vertical axis, the control surface may be provided outside the frame, preferably by shifting horizontally relative to the frame center. Preferably, a plurality of control surfaces are provided.

  In addition to or instead of the control surface, the frame is composed of two parts including a first frame part and a second frame part, and for the means for removing the exposed soil, the first For the actuator, the device can be configured to be configured for displacement of the first frame portion relative to the second frame portion, provided with a frame portion. In particular, the actuator can be configured to rotate the first frame portion about a vertical axis relative to the second frame portion. Preferably, the first frame portion is configured as an inner frame, the second frame portion is configured as an outer frame, and the inner frame is at least partially disposed on the outer frame. The outer frame can also be called a mating frame. In particular, the second frame part can be provided with at least one control surface for fixing the frame part in the groove. The second frame part is preferably provided with a suspension, on which the soil working device is suspended by the soil working device lowering means. By displacing the suspension position with respect to the other frame portions, it is possible to uniformly perform the rotational movement around the vertical axis.

  In order to rotate the soil working device, additionally or alternatively, a cutting wheel shall be provided for the means for removing the exposed soil, and for the control device to be in signal connection with the cutting wheel drive The device can be configured. By controlling the rotational speed of the cutting wheel, and more particularly by changing the rotational speed of the individual cutting wheels with respect to each other, rotational movement of the soil working device around the vertical axis can also be performed. In this aspect, the actuator can be a drive motor for the cutting wheel. However, for example, at least one drive gear may be provided, and at least one actuator that changes the gear reduction ratio may be provided on the drive gear.

  Preferably, the means for lowering the soil working device may include at least one support cable, and the frame is suspended on this support cable. In particular, the frame can be arranged in a free state on the support cable, but a linear guide device can also be provided. It proves to be particularly advantageous here for the determination of the rotational position, since the frame can be rotated very easily in a free cable suspension.

  In particular, in the case of a trench wall cutter, it is effective that the frame cross section is smaller than the removal cross section of the means for removing the exposed soil so that the removed soil can be sent out to the outside of the frame. In this embodiment, the frame stops with a gap from the inner wall, not against the inner wall of the groove. As a result, the removed soil can pass through the frame along the inner wall of the trench and be carried into the area at the top of the means for removing the exposed soil. Here, a complicated suction device on the lower surface of the frame can be omitted. A smaller cross-sectional frame is particularly advantageous for determining the rotational position, as it can limit the guidance of the soil working device within the groove.

  Basically, the gyroscope concerned here can be a single gyro or a double gyro gyroscope. However, when the gyroscope is a three-gyroscope, it is possible to determine the rotational position with extremely high accuracy and reliability. As for the structure of the gyroscope, any known type of gyroscope can usually be considered. At least one of a mechanical gyroscope including a micromechanical gyroscope such as a vibrating gyroscope or an optical gyro, preferably a fiber gyro, can be used. A micromechanical gyroscope provided on a semiconductor substrate taking into account the low frequency of maintenance management is particularly suitable.

  In order to increase the measurement accuracy, it is effective to provide at least one acceleration pickup, particularly for correcting the output signal of the gyroscope. In the most preferred example, an acceleration pickup is provided for each gyroscope of the gyroscope, that is, corresponding to each rotation axis of the gyroscope. In addition to the gyroscope, further measuring devices such as inclinometers can be provided. The acceleration pickup itself can be configured as a gyroscope.

  In order to obtain extremely high measurement accuracy, it is preferable to provide a geodetic satellite receiver that is preferably used for gyroscope calibration. In particular, at least one of a GPS receiver or a Galileo receiver can be provided. Preferably, the control device is configured for automatic calibration of the gyroscope and is in signal connection with a geodetic satellite receiver. It is effective that the gyroscope is calibrated in a state where the soil working device is pulled out before being inserted into the soil, and the current rotational position is determined by dead reckoning based on the value measured by the gyroscope. Under suitable receiving conditions, the gyroscope can be calibrated with the soil handler in the ground, and can be repeated if necessary.

  The method for forming grooves in the soil according to the invention is characterized in that the rotational position of the soil working device around the vertical axis is determined by at least one measuring device, in particular a gyroscope.

  The method of forming grooves in the soil according to the present invention can be realized in particular by the trench wall device according to the present invention, whereby the above-mentioned effects related to the device can be obtained.

  Preferably, the first measurement of the rotational position is performed on the ground surface in a state where the soil working device is pulled out. The measurement results can be related to the earth's axis of rotation in a simple way, and for this purpose the data from the geodetic satellite receiver can be used.

  At least one of further measurements or further calibration may be performed during at least one of descent or withdrawal of the soil work device.

  Basically, the rotational position can be detected in a continuous manner while the soil working device is being lowered. However, a very simple method is provided by performing the measurement discontinuously. In this case, a traverse survey (polygonal survey) model can be employed to determine the current position of the soil working device. In particular, a traverse control device can be provided for the operation of the actuator. Since the measurement is carried out when the soil working device is temporarily withdrawn, low vibrations and thus accurate measurements are achieved. Following the withdrawal and measurement, the soil work device can be lowered again.

  The measurement of the gyroscope can be performed in particular as a function of the working depth of the soil working device which can be determined, for example, by measuring the length of the unwound support cable. For example, gyroscope measurements can be made for each work step from 3 meters to 4 meters.

  Since the vibration by the means for removing the exposed soil may interfere with the measurement of the gyroscope, it is effective not to operate the means for removing the exposed soil during the measurement. Also, in the most preferred example, the soil working device is not moved in the vertical direction during the measurement.

  In the determination of the rotational position, the measurements made in the ground are associated with the measurements made on the ground by means of the control device, in particular the difference can be calculated.

  According to the present invention, the rotational position of the trench wall device can be detected as early as possible during the formation of the groove. As a result, it is possible to take corrective measures during the formation of the groove.

  Hereinafter, preferred embodiments according to the present invention will be described in more detail.

  A trench wall device according to the present invention configured as a trench wall cutter is shown schematically in FIG. The trench wall apparatus has a frame 20, and a first pair 1 of a plurality of cutting wheels and a second pair 1 'of a plurality of cutting wheels are provided at the bottom of the frame. In the front view shown in FIG. 1, the second second cutting wheel as viewed from the front side of the paper surface of the cutting wheel pair 1, 1 ′ is the first first cutting wheel appearing in the figure. Located behind. On the outer periphery of the plurality of cutting wheels, a plurality of soil working tools 5, particularly a plurality of incisors are provided for loosening and removing the exposed soil. In order to drive the plurality of cutting wheel pairs 1, 1 ′, a drive device configured as a plurality of fluid pressure rotary motors 10, 10 ′ is provided on the frame 20.

  On a construction device (not shown), the frame 20 is coupled to the cutting wheel pair 1, 1 ′ and suspended by two support cables 30, 30 ′ configured as wire cables. Further, from the frame 20, a fluid pipe 39 that sends fluid for fluid pressure to the fluid pressure rotary motors 10, 10 ′, and a feed hose 40 that sends at least one of the supporting liquid or suspension toward the soil surface in the excavated groove. Is extended.

  As can be seen from FIG. 1, the cross section of the frame 20 is considerably smaller than the cross section for soil removal of the cutting wheel pair 1, 1 ′. Accordingly, the cutting wheel can feed the removed soil through the frame 20 into the groove region at the upper part during rotation. However, the trench wall device is not guided by the frame 20 during lowering because the frame 20 does not stop against the inner wall of the groove. As a result, this may induce a rotation of the trench wall device about the vertical axis 50 during the formation of the groove, especially if the cutting wheel has to remove soils of different hardness.

  A gyroscope 2 configured as a three-axis gyroscope is provided on the frame 20 to determine the rotational position of the trench wall device about the vertical axis 50. The gyroscope 2 is connected to a control device not shown here. This control device acts on the hydrostatic rotary motor 10, 10 ', for example to change the rotational speed of the individual cutting wheels relative to each other, thereby preventing the rotation of the frame about the vertical axis 50. Further, an acceleration sensor 23 as an acceleration pickup is provided on the frame 20 and is connected to the gyroscope 2 by a signal line.

  A plan view of the groove 60 is shown in FIG. 2 along with the trench wall device placed therein. Here, because the trench wall device is rotating about a vertical axis extending perpendicular to the plane of the drawing, the current removal cross section 63 does not coincide with the desired upper end of the groove 60. More specifically, the direction of the longitudinal axis of the current removal section is rotated by an angle α with respect to the desired direction. This rotation is detected by the gyroscope according to the present invention, and measures are taken to prevent this rotation if necessary.

1 is a schematic front view of a trench wall device according to an embodiment of the present invention. It is a top view of the groove | channel in which the trench wall apparatus in embodiment which concerns on this invention is set | placed.

Explanation of symbols

  1,1 'cutting wheel pair, 2 gyroscope, 5 soil working tool, 10, 10' fluid pressure rotary motor, 20 frame, 23 acceleration sensor, 30, 30 'support cable, 39 fluid pipe, 40 feed hose, 50 vertical Shaft, 60 groove, 63 removal cross section.

Claims (10)

A trench wall device, in particular a trench wall cutter or a trench wall grab,
A soil working device comprising a frame (20) and means for removing exposed soil provided at the bottom of the frame (20);
Means for lowering the soil working device into the soil substantially parallel to the direction of the vertical axis (50);
At least one measuring device, in particular a gyroscope (2), for determining the rotational position of the soil working device about the vertical axis (50);
A trench wall device comprising: The trench wall device according to claim 1,
At least one actuator for rotating the soil working device about a vertical axis (50);
A control device connected in signal to the actuator and the gyroscope (2) to automatically control the rotational position of the soil working device;
A trench wall device comprising: The trench wall apparatus according to claim 2,
The at least one actuator includes a control surface disposed on the frame (20);
The control surface has a retracted first position and a second position protruding from the first position and is displaced to the second position to stop against the inner wall of the formed groove. A trench wall device characterized in that The trench wall apparatus according to claim 2 or 3,
The frame (20) has two parts, a first frame part and a second frame part,
Means for removing the exposed soil is provided in the first frame portion,
A trench wall device, characterized in that at least one actuator is provided for relative movement of the first frame part with respect to the second frame part, in particular rotation with respect to the vertical axis (50). In the trench wall apparatus according to any one of claims 2 to 4,
Means for removing exposed soil has a cutting wheel;
A trench wall device, wherein the control device is signal-connected to a driving device of a cutting wheel. In the trench wall apparatus according to any one of claims 1 to 5,
The means for lowering the soil working device has at least one support cable (30, 30 '), and the frame (20) is suspended on the support cable. The trench wall device according to any one of claims 1 to 6,
A trench wall device characterized in that the cross section of the frame (20) is smaller than the removal cross section of the means for removing the exposed soil so that the removed soil can be sent out of the frame. The trench wall apparatus according to any one of claims 1 to 7,
A trench wall device comprising at least one acceleration pickup for correcting an output signal of the gyroscope (2). The trench wall device according to any one of claims 1 to 8,
A trench wall device comprising a geodesic satellite receiver connected in signal connection with a gyroscope (2). A method for forming a groove in soil by the trench wall apparatus according to any one of claims 1 to 9,
Actuate the means to remove the exposed soil, provided at the bottom of the frame (20) of the soil working device,
The soil working device is lowered through the soil almost parallel to the vertical axis (50) direction,
Method for forming grooves in soil, characterized in that the rotational position of the soil working device about the vertical axis (50) is determined by at least one measuring device, in particular a gyroscope (2).

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