JP3747281B2 - Wire excavation accuracy controller for ground improvement processing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a ground improvement process used when constructing a wrap-type soil column pile for the purpose of constructing earth retaining walls, foundation construction of civil engineering architecture, ground liquefaction prevention construction, construction of water blocking walls, etc. Technical field of wire-type excavation accuracy control equipment that ensures the fixed amount of lap between soil column piles by forcibly correcting or controlling the tip position of the excavator blade shaft in real time during construction Belonging to.
[0002]
[Prior art]
Conventionally, various ground improvement works have been performed using, for example, a ground improvement processing machine as shown in FIG. This is driven by the digging drive unit 2 that is suspended from the top sheave 5 of the leader 1 and moved up and down along the rails 3 while driving the drive shaft 4 suspended just below it in a vertically downward direction. The lower end of the drive shaft 4 is connected to a drilling stirring blade shaft 6 provided with a tip cutter 7 and a plurality of stirring blades 8 at the top and bottom, and excavating the ground when rotating or lifting the shaft. The soil and stabilizer are stirred and mixed to form a soil column pile with a diameter of typically about 1 m. In the case of a wrap-type soil column pile, adjacent piles are wrapped with a wrap length of about 20 cm (also referred to as a wrap width), and continuous ground improvement is performed. In order to ensure vertical erection accuracy of the drive shaft 4, the drive shafts 37 and 38 are provided at the lower and middle portions of the leader 1. The braces 37 and 38 also move up and down along the rails 3 respectively.
[0003]
In various ground improvement works by the ground improvement processing machine, if the wrap length between adjacent soil column piles (improved piles) is insufficient or does not wrap, the integrity between the improved piles (continuity) Will be damaged, the structural strength and rigidity of the improved ground will be reduced, and the construction will not be satisfactory.
[0004]
Thus, various methods and devices for controlling excavation accuracy have been studied as countermeasures for ensuring a certain amount of lap between soil column piles. This is a technology that corrects the position of the tip of the excavator stirring blade shaft in real time during construction. Examples of such conventional technologies include:
[0005]
(1) The invention disclosed in Japanese Patent No. 2736471 (filed on June 8, 1990, Japanese Patent Laid-Open No. 4-44592) “Excavation accuracy control method and apparatus for multi-axis soil column excavator” The upper and lower portions of the shaft are connected by a plurality of wires, and the movement amount of each wire is controlled by a hydraulic control device.
[0006]
(2) The invention disclosed in Japanese Patent No. 3156049 (filed on Nov. 27, 1998, Japanese Patent Laid-Open No. 2000-160549) is a construction management method for the wrap length between soil column rows. A three-dimensional gyro sensor that measures the tip position is installed near the upper part of the excavating and stirring blade shaft, equipped with a global positioning system that measures the self-position using the so-called GPS, and constructs a wrap-type soil column pile. When the measuring means measures the bending tendency of the excavation stirring blade shaft, the tip excavation cutter is operated in reverse to correct the position. When constructing an adjacent soil column pile that wraps with the previously installed soil column pile, grasp and manage the actual lap length based on the horizontal interval and horizontal cross-sectional shape of the construction record (construction trajectory) that goes back and forth. . If a lap length error, bending tendency, etc. are observed, this is a method and a ground improvement device for correcting the position by operating the tip excavation cutter in reverse.
[0007]
(3) The invention “Ground improvement method and apparatus” disclosed in Japanese Patent Application Laid-Open No. 2001-254388 (filed on Mar. 14, 2000) is a connection site between the drive shaft of the ground improvement processing machine and the excavation stirring blade shaft. Is a universal joint capable of transmitting rotational torque, and the position of the excavator stirring blade shaft can be corrected with at least three hydraulic cylinders. The excavation direction is measured by a measuring means using a three-dimensional gyro sensor. It is configured to be modifiable.
[0008]
(4) The invention “Lower Connection Band of Stirring Drilling Shaft” disclosed in Japanese Patent Application Laid-Open No. 2002-146771 (filed on November 15, 2000) facilitates the lateral control of the drilling stirring blade shaft. For this purpose, the bearings in the lower connection band (see the member 9 in FIG. 1) that keeps the distance between the plurality of excavating and stirring blade shafts are connected with horizontal pins so that they can be deformed between each other. It is configured in a free structure.
[0009]
(5) The invention “excavation accuracy control method” disclosed in Japanese Patent Application Laid-Open No. 2002-167749 (filed on Dec. 4, 2000) is a wire-type control method. The invention disclosed in the publication No. 1 “Drilling Accuracy Control Method for Multi-Axis Soil Column Excavator” has only been able to control the direction of the excavator stirring blade shaft in the front-rear direction (left-right direction in FIG. 1). Control is also possible (in a direction perpendicular to the paper surface of FIG. 1), and accuracy is improved.
[0010]
[Problems to be solved by the present invention]
In the construction of wrap-type soil column piles by ground improvement processing machines, it is necessary to design in advance as a measure to prevent inadequate construction of wrap length between soil column piles or lack of wrap. It is often constructed with an extra wrap length that is larger than the wrap length. As a result, the volume of ground improvement increased as the pitch of the ground improvement piles was reduced, which was inefficient and uneconomical.
[0011]
Therefore, improved techniques as exemplified in the above (1) to (5) have been studied, but it cannot be said that the technique is still fully ripe with satisfactory content.
[0012]
That is, the control method (1) described above is a configuration in which the wire movement amount is controlled by the hydraulic control device, but the important control target value is based on an indirect measurement method based on the wire movement amount. There is a question as to whether a control result consistent with the error in the tip position of the drilling shaft can be obtained.
[0013]
The construction management method (2) above is groundbreaking in that it uses a three-dimensional gyro sensor and uses GPS to measure and manage the actual lap length in real time using a global positioning system. is there. However, as a means for correcting the position, the tip excavating cutter is only operated in reverse to correct the position, and it is difficult to expect an agile and reliable response.
[0014]
The ground improvement method (3) above can freely transmit rotational torque to the point measured by the measuring means using a three-dimensional gyro sensor and the connection part between the drive shaft of the ground improvement processing machine and the excavation stirring blade shaft. The point that the position of the excavating stirring blade shaft can be corrected with at least three hydraulic cylinders as a joint can be expected to be more agile and reliable than the former two. However, the precise mechanical parts (universal joints, hydraulic cylinders, etc.) are deeply penetrated into the excavated soil, and there are problems in terms of ensuring durability, maintenance, and inspection.
[0015]
Although the usefulness of the lower connection band of the above (4) is sufficiently recognized, an excavation accuracy control method that fully applies this has not yet been completed.
[0016]
It can be noted that the excavation accuracy control method (5) is a wire-type control method, but its relevance to the position measurement technique of the excavation stirring blade shaft is ambiguous.
[0017]
As has been examined and examined individually, the conventional technology has its own unique features, but it has not been fully matured so that the entire system can be integrated and immediately implemented on site.
[0018]
The object of the present invention is to take advantage of the wire-type excavation accuracy control method and combine the position detection technology of the excavation agitation blade shaft tip with the three-dimensional gyro sensor described in (2) above, so that the position of the improved pile previously constructed (Trajectory) and the excavation shaft tip position of the improved pile to be wrapped next are detected in real time, and if a tendency to deviate from the planned position is observed during construction, the direction correction of the tip position is promptly and accurately corrected Wire-type excavation accuracy control for ground improvement processing machines that can be executed with highly responsive control, perform real-time position correction at the time of construction, and secure the necessary or appropriate lap amount as well as control the installation accuracy. To provide an apparatus.
[0019]
The next object of the present invention is to make it possible to easily ensure a certain amount of lap between soil column piles, and to make it possible to construct without waste with the wrap length required for the design. An object of the present invention is to provide a wire-type excavation accuracy control device for a ground improvement processing machine capable of appropriately constructing a pitch of improved piles and thus enabling efficient and economical ground improvement work.
[0020]
[Means for Solving the Problems]
As means for solving the above-mentioned problems, a wire excavation accuracy control device for a ground improvement processing machine according to the invention described in claim 1 is:
A hydraulic cylinder 10 suspended below an excavation drive unit 2 that rotates the drive shaft 4 of the ground improvement processing machine and propels it vertically downward along the leader 1 , and an excavation stirring blade shaft 6 connected to the lower end of the drive shaft 4 A plurality of wires 12 and the like 12 are connected to a bearing member 11 provided immediately above the center of the drive shaft 4, and the wires 12 are individually pulled by the hydraulic cylinder 10 to excavate and stir blade shafts. In the wire type excavation accuracy control device for correcting and controlling the tip position of 6 ,
In the bearing member 11 that keeps the distance between the shafts of the drive shafts 4 and the excavation and stirring blade shafts 6 connected to the lower ends thereof, the bearings of the drive shafts 4 are configured as roller bearings 11a, and the adjacent drive shafts 4 and 4 are arranged. The bearings 4 are movably connected by a pin joint structure with horizontal pins 11d so as to allow lateral deformation between each other, and wires 12 and the like are connected to the brackets 15 of the horizontal arms protruding outward from the respective bearings. The lower ends are connected, and the upper ends of the wires 12 and the like are connected to the output shaft of the hydraulic cylinder 10 arranged at a ratio of one to one by a connecting tool 13,
A three-dimensional gyro sensor device that is installed near the bearing member 11 and measures the tip position of the excavating and stirring blade shaft 6 ;
A construction management device 22 to which a measurement signal of the tip position of the excavation stirring blade shaft 6 measured by the three-dimensional gyro sensor device is input;
A hydraulic control circuit for the hydraulic cylinder 10 controlled by a control signal calculated by the construction management device 22 based on the measurement signal;
The corresponding hydraulic cylinders 10 are individually controlled through the hydraulic control circuit, the wires 12 and the like are pulled, and the other hydraulic cylinders are held to forcibly correct and control the tip position of the excavating stirring blade shaft 6. Features.
[0021]
The invention described in claim 2 is the wire-type excavation accuracy control device of the ground improvement processing machine described in claim 1,
The drive shaft 4 is configured as a plurality of connecting shafts obtained by joining a plurality of unit shafts in series. The drive shaft 4 is bent using the play of the shaft joint 40 at each joint, and the tip of the excavating stirring blade shaft 6 is bent. forcibly correct the position, and characterized in that it possibly to control.
[0023]
The invention described in claim 3 is the wire-type excavation accuracy control device of the ground improvement processing machine described in claim 1,
Hydraulic control circuit of the hydraulic cylinder 10 is made comprises a shut-off valve to Rutotomoni holding state provided a high voltage control circuit 30 and the low-voltage control circuit 31 in parallel, to supply high pressure oil of the high-voltage control circuit 30 to the hydraulic cylinder 10 The wire or the like 12 is pulled and the low-pressure oil of the low-pressure control circuit 31 is supplied to take the slack of the wire 12 or the like.
[0024]
Embodiments and Examples of the Invention
Next, based on FIGS. 1-6, embodiment of the wire-type excavation precision control apparatus of the ground improvement processing machine which concerns on the invention described in Claims 1-4 is described.
[0025]
As described above, the ground improvement processing machine of FIG. 1 includes a hydraulic cylinder 10 suspended below the excavation drive unit 2 that drives the drive shaft 4 to rotate vertically along the rail 3 of the leader 1. A plurality of wires 12 (or a PC steel rod, a PC steel wire, etc.) centering on the drive shaft 4 between the shaft 11 and a bearing member 11 provided immediately above the excavating and stirring blade shaft 6 connected to the lower end of the drive shaft 4 Hereinafter, these are collectively referred to as wires, etc.), and each wire 12 is pulled individually by the hydraulic cylinder 10 to forcibly correct the tip position of the excavating stirring blade shaft 6. The wire type excavation accuracy control device to be controlled is configured.
[0026]
As shown in the enlarged view of the excavation drive unit 2 in FIGS. 2A and 2B, this is an embodiment of the biaxial ground improvement processor. Two driving shafts 4, 4 their respective two plural and excavation stirring blade axes 6, 6 connected to the lower end of the arrangement of wires 12 ... and, FIG. 3, are as illustrated in FIG. 4 There are a total of six wires 12... Surrounding the two drive shafts 4 and 4.
[0027]
FIG. 2 shows a configuration in which the upper ends of the six wires 12 are connected to the output shaft of the hydraulic cylinder 10 by a pin joint type connector 13 at a ratio of one to one. The upper end of the main body of each hydraulic cylinder 10 is also freely connected to a bracket prepared on the lower bottom of the excavation drive unit 2 by a pin joint 14.
[0028]
On the other hand, the lower ends of the six wires 12... Are extended by brackets 15 of the respective horizontal arms protruding from the bearing member 11 in the horizontal direction and the screw-type couplings 16 as shown in FIG. It is connected in a configuration that can be adjusted. A portion of the connector 16 is covered with a protective cover 17 so as not to be soiled with earth and sand.
[0029]
The bearing member 11 that keeps the two drive shafts 4, 4 at a constant inter-axis distance uses a roller bearing 11 a that supports the drive shaft 4 rotatably with low friction. The roller bearing 11a also has a characteristic that it has a high rigidity enough to withstand the force of correcting the tip position of the excavation stirring blade shaft 6 by pulling the bearing member 11 by wire control. As the specific configuration of the roller bearing 11a, a configuration in which the drive shaft 4 is rotatably supported by an angular type roller bearing as shown in FIG.
[0030]
While keeping the distance between the two drive shafts 4 and 4 and thus the two excavation stirring blade shafts 6 and 6 constant, it is possible to easily allow lateral deformation between the adjacent drive shafts 4 and 4. In order to make the configuration, the two roller bearings 11a have a bracket 11b extending in parallel in the lateral direction from the outer surface of the two roller bearings 11a so as to overlap with both ends of the hinge member 11c at the intermediate position, and the two pins 11d are inserted in the horizontal direction. It is configured to be movable by being connected by a pin joint structure connected together.
[0031]
As shown in FIG. 4, the lower ends of the six wires 12... Already described have horizontal arms at positions in three right angles included in the semicircles of the outer half of the two roller bearings 11a and 11a. projects that have been connected to each bracket 15 provided with evenly placed so moment acts.
[0032]
Therefore, strong one of the wire 12 ... six, by pulling in the hydraulic cylinder 10 of the weaker one, two drive shafts 4, 4, and thus the two excavating stirring blades shaft 6,6 The front end position can be easily and forcibly corrected and controlled in both the front-rear direction (Y direction in FIG. 4) and the lateral direction (X direction in FIG. 4).
[0033]
In addition, as a real-time measuring means of the tip positions of the two drive shafts 4 and 4 and thus the two excavating stirring blade shafts 6 and 6, the position near the bearing member 11, more specifically, shown in FIG. As shown, the illustration is omitted in the sensor case 20 fixed to the outer surface of the roller bearing 11a on the right side of the figure and positioned at the center of the two drive shafts 4, 4. For example, as disclosed in the above-mentioned Japanese Patent No. 3156049, a three-dimensional gyro sensor device comprising a combination of an inclinometer in the X and Y two-dimensional directions and a gyro sensor is installed.
[0034]
By this three-dimensional gyro sensor device, the position of the tip of the excavating stirring blade shaft 6 is accurately detected in real time in the construction process of the ground improvement work by the ground improvement processing machine. In addition, the trajectory and horizontal cross-sectional shape of the constructed soil column piles are also recorded as data. The measurement signal from the three-dimensional gyro sensor device is sent to the ground construction management device 22 (FIG. 5) through the signal line in the signal line protection tube 21 connected to the sensor case 20.
[0035]
FIG. 5 shows a hydraulic control circuit that automatically controls the hydraulic cylinder 10 in real time based on the measurement value of the three-dimensional gyro sensor device. This is a configuration in which a high pressure control circuit 30 and a low pressure control circuit 31 are provided in parallel for one hydraulic cylinder 10, and the wire 12 is pulled by the high pressure control circuit 30.
[0036]
When the measurement signal 23 measured by the three-dimensional gyro sensor device in the underground sensor case 20 is input to the construction management device 22 (this is a usual personal computer), the pressure conversion attached to each hydraulic cylinder 10 is performed. Comparison processing is performed with the pressure signal 25 input from the container 24, and the result of the comparison calculation is sent to the hydraulic cylinder operation panel 27. At the same time, the screen is displayed on the operator's monitor 26 in real time.
[0037]
The hydraulic cylinder operation panel 27 generates and transmits control signals to the high pressure control circuit 30 and the low pressure control circuit 31 of each of the six hydraulic cylinders 10 based on the result of the comparison calculation. That is, the electromagnetic relief valve 32, the shut-off valve 33, the electromagnetic switching valve 34, and the electromagnetic switching valve 35 of the low pressure control circuit 31 of the high pressure control circuit 30 are controlled.
[0038]
For example, when the wire 12 is pulled by the hydraulic cylinder 10, the high-pressure control circuit 30 is opened with the shut-off valve 33 free, and high-pressure oil is sent to the piston lower chamber of the hydraulic cylinder 10 to perform a contraction operation. When the holding state is set, the shutoff valve 33 is closed, and the stroke of the hydraulic cylinder 10 is maintained unchanged even when an external force is applied. When setting the neutral state to remove the slack of the wire 12, the low pressure control circuit 31 is opened while the shutoff valve 33 is free, the low pressure oil is sent to the piston lower chamber of the hydraulic cylinder 10, and the wire 12 A tension state is maintained by a weak tension that does not loosen (the invention according to claim 3 ).
[0039]
In short, in FIG. 4, when the wire 12 indicated by reference signs a, b or e, d is pulled by the hydraulic cylinder 10, the position correction in the front-rear direction can be performed. By pulling the wires 12 with the symbols b, c, d or a, f, e, the position can be corrected in the lateral (left / right) direction. At this time, the hydraulic cylinders 10 of the other wires 12 are each in a holding state and give a reaction force for position correction. In addition, control necessary for position correction of the tip positions of the two drive shafts 4, 4, and by extension, the two excavation stirring blade shafts 6, 6 can be accurately and forcibly executed in various combinations. .
[0040]
When the tip position of the excavating stirring blade shaft 6 deviates from or is likely to deviate from the planned position (position of the set lap length), the correction and control to the planned position are immediately performed through the hydraulic cylinder 10 and the wire 12. . Therefore, it is not necessary to work in anticipation of an extra wrap length in advance.
[0041]
The position correction of the tip positions of the two drive shafts 4 and 4 and thus the two excavation stirring blade shafts 6 and 6 is controlled by pulling each wire 12 with the hydraulic cylinder 10 as described above. The adjustment of the size (the size of the hydraulic pressure supplied to the hydraulic cylinder 10) varies depending on the conditions such as the excavated soil quality and its properties, the size of the wrap length of the soil column pile. For this reason, it is preferable to first carry out the test construction, collect information necessary for the actual site, and obtain the magnitude of the pulling force and the hydraulic pressure that can be controlled based on the result.
[0042]
Also, as the ground improvement work progresses, as disclosed in the patent invention of Japanese Patent No. 3156049, various data necessary for construction management of soil column piles are collected, and the analyzed numerical values are input to the construction management device 22・ Record and calculate the tensile force required for position correction and control. It is preferable to repeat the process of comparing and collating with the position detection data and the plan, reflecting the result in automatic hydraulic control, and feeding back the result to the tip position control.
[0043]
Incidentally, in correcting the position in the lateral direction of pulling the wire 12 of the above-mentioned symbols b, c, d or a, f, e, two rollers as bearing parts of the bearing member 11 as shown in FIG. The pin joint structure in which the bearings 11a and 11a are connected by the pin 11d does not generate unnecessary resistance, and enables position correction with good responsiveness.
[0044]
As a device that enables position correction with better responsiveness, the drive shaft 4 according to the ground improvement processing machine of the present invention has a plurality of unit shafts in series with a shaft coupling 40 as illustrated in FIGS. 6A and 6B. It is configured as a joined multiple connecting shaft. Using the play generated in the shaft joint 40 at each joint, the drive shaft 4 bends smoothly up to the position of the bearing member 11, and the tip position of the excavating stirring blade shaft 6 is forcibly corrected. Is made possible (the invention described in claim 2).
[0045]
The unit axis of the excavation shaft 4 is generally various in a range of 5 m to 10 m and for adjustment in a range of 1 m to 4 m. The play of the shaft coupling 40 is typically about 2.6 × 10 ⁻² rad when it is new, and gradually increases depending on the frequency of use. Therefore, by appropriately designing the number of shaft couplings 40, the drive shaft 4 that is easily bent can be easily obtained, and the position control is facilitated. Therefore, the control shaft is much more advantageous in terms of control than a single drive shaft. . However, if an appropriate tensile force is applied to the drive shaft 4 by the wire 12 in a well-balanced manner, the rigidity of the drive shaft 4 can be supplementarily improved.
[0046]
6A and 6B, when the wire 12 is pulled to cause the drive shaft 4 to bend and the tip position of the excavation stirring blade shaft 6 is corrected and controlled, the fixed point of the drive shaft 4 is the lower part. It becomes a steady rest 37. Therefore, the lower brace 37 is also implemented by a configuration employing a roller type guide mechanism using a roller that rotatably supports the drive shaft 4 as shown in FIG. 2A of Japanese Patent Laid-Open No. 2001-234527, for example. It is preferable to do this. The intermediate brace 38 is configured similarly.
[0047]
[Effects of the invention]
The wire-type excavation accuracy control device of the ground improvement processing machine according to the invention described in claims 1 to 3 measures the tip position of the excavation stirring blade shaft with a three-dimensional gyro sensor device, Then, the excavation shaft tip position of the improved pile to be wrapped next is detected and compared in real time, and if a tendency to deviate from the planned position is observed, the direction correction of the tip position is promptly corrected accurately. Since it can be executed with good control, it is possible to control the erection accuracy to ensure the lap amount necessary for construction accurately.
[0048]
Therefore, according to the present invention, it is possible to easily perform the construction in which the amount of lap between the soil column piles is ensured to be a certain amount accurately. Therefore, construction can be performed without waste with a wrap length necessary for design. As a result, the pitch of the ground improvement piles can be made appropriate, and the ground improvement work can be performed efficiently and economically.
[Brief description of the drawings]
FIG. 1 is an elevation view of a ground improvement processing machine according to the present invention.
FIGS. 2A and 2B are a front view and a side view in which the vicinity of the excavation drive unit is enlarged. FIG.
FIG. 3 is an enlarged front view showing the vicinity of a bearing member below a drive shaft.
FIG. 4 is a cross-sectional view of a bearing member as seen in a planar direction.
FIG. 5 is a control circuit diagram of a hydraulic cylinder.
FIGS. 6A and 6B are explanatory views schematically showing the configuration of a drive shaft and a bent state. FIGS.
[Explanation of symbols]
4 Drive shaft 1 Leader 2 Excavation drive unit 10 Hydraulic cylinder 6 Excavation stirring blade shaft 11 Bearing member 12 Wire etc. 20 Sensor case (built-in 3D gyro sensor device)
22 Construction Management Device 30 High Pressure Control Circuit 31 Low Pressure Control Circuit 27 Hydraulic Cylinder Operation Panel 40 Shaft Coupling 11a Roller Bearing Bearing (Bearing Parts)
11d pin

Claims (3)

A hydraulic cylinder suspended below the excavation drive unit that rotates the drive shaft of the ground improvement processing machine and propels it vertically downward along the leader, and an excavation stirring blade shaft connected to the lower end of the drive shaft. Wire-type excavation, in which a plurality of wires, etc., are connected to the bearing member centered on the drive shaft, and each wire is individually pulled by the hydraulic cylinder to correct and control the tip position of the agitation blade shaft In the precision control device,
The bearing member that keeps the distance between the shafts of the drive shafts and the agitation blade shaft connected to the lower end of each drive shaft is configured such that the bearings of the drive shafts are roller bearings, and the bearings of the adjacent drive shafts are transverse to each other. It is movably connected with a pin joint structure with horizontal pins so as to allow deformation in the direction, and the lower end of the wire etc. is connected to the bracket of the horizontal arm protruding outward from each bearing, and the upper end of each wire etc. It is connected to the output shaft of a hydraulic cylinder arranged at a rate of one unit per one with a coupling tool,
A three-dimensional gyro sensor device installed in the vicinity of the bearing member for measuring the tip position of the excavating stirring blade shaft;
A construction management device to which a measurement signal of the tip position of the excavation stirring blade shaft measured by the three-dimensional gyro sensor device is input;
A hydraulic control circuit of the hydraulic cylinder controlled by a control signal calculated by the construction management device based on the measurement signal;
The corresponding hydraulic cylinders are individually controlled through the hydraulic control circuit to pull the wires, and the other hydraulic cylinders are held to forcibly correct and control the tip position of the excavating stirring blade shaft. , Wire type excavation accuracy control device for ground improvement processing machine. The drive shaft is configured as a plurality of connecting shafts in which a plurality of unit shafts are joined in series, and the drive shaft is bent using the play of shaft joints at each joint, forcing the tip position of the excavator stirring blade shaft corrected, characterized in that it occupies if possible to control, wire drilling accuracy control of ground improvement processor according to claim 1. Hydraulic control circuit of the hydraulic cylinder is made provided with a shut-off valve to Rutotomoni holding state provided a high voltage control circuit and a low-pressure control circuit in parallel for each one group, by supplying high pressure oil of the high-voltage control circuit to the hydraulic cylinder The wire-type excavation accuracy control device for a ground improvement processing machine according to claim 1, wherein the wire or the like is pulled and the low-pressure oil of the low-pressure control circuit is supplied to take the slack of the wire or the like.

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