JP2009510286A - Equipment for making underground continuous walls - Google Patents

Abstract

The device (18) for creating a continuous underground wall comprises a rear part (28) having means (46) for filling a part of the groove located behind the device with concrete and a cutting means for making a part of the groove in front of the device. A front part (26) having (20) and means (60, 62) for correcting the horizontal distance between the front part and the rear part, the cutting means comprising vertical guide means (29), At least one rotary cutter (20) having a rotation axis that is horizontal and parallel to the width direction of the groove, between the bottom position corresponding to the bottom of the groove and the upper position above the groove, along the guide means The cutter is suitable for cutting the soil in the groove and kneading to obtain a paste-like substance.
[Selection] Figure 2

Description

  The present invention relates to an apparatus for making a continuous underground wall and a method for making such a wall.

  A commonly used technique for making a continuous underground wall is to dig a groove corresponding to the path of the wall to be made and fill the groove with concrete, preferably with reinforcement. More precisely, the groove is usually made by a continuous part, and then the grooved part is filled with concrete to form a continuous wall panel.

  If the wall to be created is not deep enough, an excavator that moves along the groove while creating various parts of the groove can be used.

  U.S. Pat. No. 3,893,302 describes an apparatus and method for drilling a groove and providing a wall in the drilled groove. This device comprises a cutting tool in the form of a drilling endless chain which is arranged at the front of the device and carries a bucket. At the rear of the device there is a vertical duct for feeding concrete from the container located outside the groove to the rear of the device in order to fill the dug groove.

  This device has several drawbacks, especially in continuous bucket chains where it is impossible to obtain grooves on all types of terrain. Specifically, such cutting tools cannot be used on hard terrain. It is known that certain grooves need to be made in multiple formations of different hardness.

  The first object of the present invention is to provide an apparatus for making a continuous underground wall which has repaired the above-mentioned defects.

In order to achieve this purpose, the equipment for making underground continuous walls is
A first fixing means for fixing on the side wall of the groove, and a rear portion comprising means for filling a part of the groove located behind the device with concrete;
A second fixing means for fixing on the side wall of the groove, a cutting means for making a part of the groove in front of the apparatus, and a front portion having a take-out means for taking out the soil cut by the cutting means; ,
Means for correcting a horizontal distance between the front part and the rear part,
The cutting means includes vertical guide means, at least one rotary cutter having a rotation axis that is horizontal and parallel to the width direction of the groove, and a bottom position corresponding to the bottom of the groove and an upper position above the groove. And a means for moving the cutter along the guide means,
The cutter is suitable for cutting the soil of the groove and kneading the soil to obtain a paste-like substance.

  It will be appreciated that by using a cutter having a rotation axis that is horizontal and perpendicular to the length of the groove, the cutter can be fitted with a tool that can pass through all the formations that are traditionally present at the construction site. . Such a cutting tool can be configured by a cutting pick.

  Furthermore, while moving up and down along the entire length of the groove, the cutting tool not only cuts the ground but also has the role of kneading it with the water that normally exists in the ground. This yields a pasty material that can be easily removed thereafter.

  Depending on the situation, it is desirable to inject the material during drilling, especially when the amount of water already present is not sufficient to obtain a paste. These materials may be mud, which may or may not have polymers and soil control additives that improve its integrity and / or permeability.

  Another object of the present invention is to provide a method of making an underground continuous wall using, but not limited to, the excavator described above.

How to make a continuous underground wall
A step of digging the groove by making a plurality of continuous parts underground by a device that moves horizontally in the groove;
Removing soil corresponding to excavation of the continuous portions of the groove;
Moving the device in a plurality of successive stages corresponding to the plurality of portions of the groove;
Filling a part of the groove located behind the device with concrete,
The excavation of the groove part is carried out by vertically moving a rotary tool suitable for cutting the soil in the groove and kneading to convert the soil cut in the groove into a paste. It is characterized by that.

  Other features and advantages of the present invention will become more apparent upon reading the following description of various embodiments of the invention, given by way of non-limiting examples.

  The following description refers to the accompanying drawings.

  FIG. 1 shows a handling crane with a platform 10 that preferably has a crawler 12 attached and carries a substantially upright boom 14. This boom serves to support the cable forming the pulley stand 16 with a suitable excavator 18 suspended from the lower end of the cable. The cutting tool of the excavator is a cutter 20 and will be described in more detail below. The cutter 20 can be moved vertically along the structure of the excavator 18 by using a control bar 22 or “Kelly”. The control bar 22 can be moved vertically by using a winch of a handling crane. Reference numeral 24 denotes a structure for guiding the control bar 22 on its surface.

  With reference to FIGS. 2 and 4 in more detail, a preferred embodiment of the excavator 18 will be described below. This is constituted by a front part 26 and a rear part 28.

  The front part 26 comprises a structure constituting a vertical guide part 29, means 30 for taking out the cut soil, and preferably a plurality of tubes for injecting liquid additives into the cut soil. The tubes are labeled 32 and 34. The front part 26 also has two series of two side shoes for fixing on the side walls of the groove, which are respectively labeled 36 and 38. These shoes are controlled by an actuator 40. When in the overhang position, the shoes 36,38 press against the groove wall 42, thereby holding the excavator front 26 stationary.

  The rear portion 28 of the excavator is substantially constituted by a vertical structure 44 and a pipe 46 for injecting concrete into the created groove portion. The rear portion 28 also has two sets of guide shoes 48 and 50 that are controlled by an actuator 52. When in the overhang position, the shoes 48, 50 engage the groove side walls 42, thereby providing a securing means for holding the rear portion 28 of the excavator 18 stationary.

  The front part 26 is also provided with a cutting tool 20 attached to the lower end of the control bar 22. The cutting tool is preferably constituted by a cutter provided with two drums 54 and 56 having a horizontal axis parallel to the width direction of the groove to be formed. The cutter is attached so as to rotate around a support body 58 that is guided by the guide portion 29 and moves in parallel. A normal cutting pick 59 is attached to the drums 54 and 56.

  In another embodiment, the cutting tool 20 constituted by the drums 54 and 56 is guided by the vertical guide portion 29, and the cutting tool is disposed at the bottom position corresponding to the bottom portion of the groove and above the groove. It may be attached to a support body to which a motor that enables parallel movement of the cutting tool 20 is provided.

  The excavator front 26 and rear 28 are interconnected by at least two actuators operating horizontally. The two actuators are a lower actuator 60 and an upper actuator 62, respectively. These actuators have the role of changing the horizontal distance between the front portion 26 and the rear portion 28 of the excavator and the role of pressurizing the front portion 26 of the excavator. The middle part of the excavator is also preferably equipped with a system 64 that allows the front and rear to be angled in a horizontal plane. As an example, the system is attached to the cylinder of the upper actuator 62 and has a link 68 with one end fixed to the rod end of the control actuator 66 and the other end connected to the structure of the excavator front 26. It may be configured by a control actuator 66 for controlling the above. The second link 70 cooperates with the first link 68 to form a deformable parallelogram. Therefore, it can be understood that by controlling the control actuator 66, the front portion 26 of the excavator can be given an angle with respect to the rear portion in the horizontal plane. Therefore, it is possible to form a non-linear groove. Prior to providing such an angle, the cutting tool 20 is pulled up to be positioned above the groove. Thereby, since the cutting tool does not inhibit the angle, the angle is easily obtained.

  FIG. 3 illustrates a preferred embodiment of a system 30 for removing a workpiece. This take-out system is constituted by a cylindrical portion 80 having a height equal to or higher than the height of the excavator structure. An auger 82 (auger) is mounted in the cylindrical portion 80 so as to rotate around the vertical shaft 84. A motor 86 for rotating the auger is attached to the upper part of the cylindrical portion 80. The upper end of the cylindrical portion 80 also has a discharge port for discharging the cut material. The cylindrical portion 80 has a plurality of openings, such as 88, having a large size along the height direction in order to be able to remove the workpiece on the auger 82.

  Of course, other cutting removal systems may be used, such as bucket chains with valves, telescopic fittings, or flexible tubes flattened by wheels using the principle of peristaltic pumps, The means are not fully hydraulic.

  Here, the term non-hydraulic removal means is used to include means that do not utilize debris produced by the action of placing the cutting tool into a suspension in liquid. Specifically, such take-out means can be used by converting the cut soil into a paste-like substance. Waste disposal is greatly simplified by removing debris without using a large amount of liquid.

  The method for using the above-described apparatus and the method of the present invention for producing such an underground continuous wall will be described below.

  By using a normal means such as a cable bucket or a hydraulic bucket, a first portion constituting one panel having a workpiece depth is formed. The width of the first portion of the groove corresponds to the width of the excavator. The panel is filled with mud to ensure terrain stability.

  The excavator 18 is then inserted into this part of the groove and then arranged to start the horizontal excavation process. For this purpose, the device is first held stationary by the front actuators 36,38. The cutting tool 20 is inserted vertically into the ground. As explained above, this cutting tool is preferably constituted by a cutter having a drum driven by a hydraulic motor and provided with a cutting pick.

  The cutting performance of such a tool is suitable for passing through all the formations normally present at the construction site. In this descending process, the cut object is not taken out. These are cut and mixed with the underground water and, preferably, the material injected by the pipes 32, 34 during drilling. These materials may be mud, which may or may not have polymers and soil control additives that improve its integrity and / or permeability. Therefore, the drum has a role of kneading the cut soil as well as cutting the soil to form grooves. Once the cutting tool 20 reaches the bottom, the rotation direction may be arbitrarily changed and the cutting tool 20 may be raised toward the ground surface. The cutting tool not only cuts the soil while moving upward and downward, but also functions to knead the ground soil to convert it into a paste.

  When a part of the groove is taken out and converted into a paste-like substance, the rear shoes 50 and 52 are placed in the overhanging position to fix the rear part 28 of the device in the groove, and the front shoe retracts. . Due to the reaction force from the rear shoe, the horizontal actuators 60, 62 pressurize the front part 26 of the excavator, in particular the system 30 for removing the pasty material. This pressure allows supply from the opening 82 to the removal system. Next, the auger 84 takes out the paste-like substance.

  In the next procedure, the front side shoes 36, 38 are moved to the overhang position to fix the front part 26 of the ejector and the rear shoe is retracted. The horizontal actuators 60, 62 retract so that the rear portion 28 approaches the front portion 26, thereby opening a portion of the groove at the rear of the device. A portion of this groove is immediately filled with concrete or other material suitable for this type of workpiece using the concrete system 46. It can be seen that during concrete processing, the excavation process can be resumed using the cutting tool 20 to create a new part of the groove while the excavator is held stationary by the front shoe. Will.

  The front part of the cut groove is supported by a cutting tool 20 that holds paste-like soil. A horizontal support may be provided by a biodegradable liquid that exerts hydrostatic pressure on a limited volume pressure module.

  Moreover, it is possible to confirm that the excavator is a vertical member. The upper and lower pressure shoes of the front part 26 and the rear part 28 of the excavator ensure that the structure of the device is in a vertical position. Such position monitoring is performed before inserting the cutting tool to make the next part of the groove. Any errors in the vertical direction can be corrected by properly operating the front and rear and lower and upper shoes.

  In addition, as described above, the excavator desirably includes a system 64 that can provide a horizontal angle between the front portion 26 and the rear portion 28. This makes it possible to create a non-linear groove, or conversely to correct any horizontal trajectory error when making a linear groove.

It is the perspective view which showed the whole excavator which was outside the wall, and was carry | supported by the handling crane. It is the perspective view which showed the lower part of the excavator. It is the perspective view which showed suitable embodiment of the means to take out a paste-form substance. It is a top view of the lower part of an apparatus. It is the perspective view which showed the whole apparatus at the time of use.

Claims (15)

A device for making underground continuous walls,
A first fixing means for fixing on the side wall of the groove, and a rear portion comprising means for filling a part of the groove located behind the device with concrete;
A second fixing means for fixing on the side wall of the groove, a cutting means for forming a part of the groove in front of the apparatus, and a front portion including a taking-out means for taking out the soil cut by the cutting means;
Means for correcting a horizontal distance between the front part and the rear part,
The cutting means is
Vertical guide means, at least one rotary cutter having a rotation axis that is horizontal and parallel to the width direction of the groove, and between a bottom position corresponding to the bottom of the groove and an upper position above the groove, Comprising means for moving the cutter along the guide means;
An apparatus characterized in that the cutter is suitable for cutting the soil in the groove and kneading the soil to obtain a paste-like substance.   The apparatus according to claim 1, wherein the front portion further includes an injection unit that injects a liquid additive into the cut soil in order to easily obtain a paste-like substance.   3. An apparatus according to claim 1 or 2, wherein the cutter is constrained to move along the vertical guide means and is attached to a support which is moved by a vertical control bar.   The apparatus according to claim 3, wherein the control bar is moved by a winch of a handling crane.   3. An apparatus according to claim 1 or 2, wherein the cutter is constrained to move along the vertical guide means and is attached to a support to which motor means are attached.   6. The apparatus according to claim 1, wherein the means for taking out the paste-like substance is not completely hydraulic.   The take-out means has a hollow cylindrical portion that extends substantially along the entire length of the groove and that is perforated to have an opening facing the front of the device and in which a vertical axis auger is attached. The apparatus according to claim 6, comprising:   8. The means for correcting the horizontal distance is suitable for pressurizing the front part of the device when the first fixing means is actuated. Equipment.   The apparatus according to claim 1, further comprising means for giving an angle in a horizontal plane between the front part and the rear part of the apparatus. Digging the groove by making a plurality of continuous parts underground with a device that moves horizontally in the groove;
Removing soil corresponding to excavation of the continuous portions of the groove;
Moving the device in a plurality of successive stages corresponding to the plurality of portions of the groove;
Filling a part of the groove located behind the device with concrete, and forming a continuous underground wall,
Each part of the groove is excavated only by moving the rotating tool in the vertical direction,
The rotating tool cuts the soil in the groove while moving downward in the vertical direction, and the moving tool moves downward in the vertical direction and vertically upward while moving in the groove. A method characterized in that it is suitable for kneading to convert the cut soil into a paste-like substance.   The method according to claim 10, wherein an additive is injected into the cut soil in order to easily obtain the pasty substance.   The method according to claim 10, wherein the cutter is a rotary cutter that has a rotation axis orthogonal to a traveling direction of the apparatus and moves vertically.   13. A method according to any one of claims 10 to 12, wherein the pasty substance is removed from the groove by a non-hydraulic system attached to the device.   14. A method according to any one of claims 10 to 13, wherein the apparatus is pressurized forward to hold the front of the cut groove.   15. A method according to any one of claims 10 to 14, characterized in that an angle in a horizontal plane is provided between the front part and the rear part of the excavator to create a non-linear groove.

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