JP4206011B2 - Ground excavation method - Google Patents

Description

  The present invention relates to a ground excavation method for excavating the ground to construct a excavation groove and stirring the excavation groove.

Conventionally, as a ground excavation method for excavating the excavation groove, three rotary shafts (excavation shafts) that can be rotated by being connected to a speed reducer at the upper end are integrated and arranged at both ends. There is a ground excavation method using an excavating and agitating device that rotates two rotating shafts in the same direction and rotates a rotating shaft arranged in the center in a direction different from the rotating direction. In this ground excavation method, each rotary shaft of the excavator agitator is rotated into the excavation groove while being excavated and agitated, and a solidifying agent is introduced into the excavation groove from a through hole provided in the rotary shaft. Injecting (see, for example, Patent Document 1).
In addition, a multi-axis excavator body including a plurality of rotating shafts (excavating shafts) provided with excavating blades and kneading blades around and a driving unit having a plurality of prime movers that rotationally drive each rotating shaft is provided on a base machine. There is a ground excavation method using an excavating and stirring device that is supported by a leader mast so as to be movable up and down (see, for example, Patent Document 2).

In addition, as shown in Japanese Patent Application No. 2002-204775, the applicant of the present invention has a peripheral drive type hydraulic motor (hereinafter referred to as an “outer motor”) having an output portion that can rotate around an inserted fixed shaft. ). This excavator and agitation device using an outer motor has a hollow provided with a drilling blade and a kneading blade in the periphery so that the fixed shaft supported by the base machine passes through the outer motor and the fixed shaft is inserted. The top of the rotating shaft is connected to the output portion of the outer motor. In the ground excavation method using this excavator agitator, the rotating shaft is rotated about a concentric axis with the fixed shaft, thereby excavating and stirring in the excavation groove and excavating the solidifying agent from the through hole provided in the fixed shaft. It is injected into the groove.
JP 7-229146 A (page 2-4, FIG. 1) JP 2000-352070 A (page 1-4, FIG. 1-2)

However, the conventional excavation and stirring device has the following problems.
FIG. 7 is a schematic view showing the rotation direction of the rotary shaft of the excavation and stirring device used in the conventional ground excavation method. When constructing excavation grooves that form continuous underground walls with three rotary shafts arranged side by side in the base machine of the excavator agitator, as shown in FIG. There is, and it is constituted so that a part of excavation range of adjacent rotating shafts 60 may overlap. In this configuration, in order to prevent interference between the excavating blades installed at the lower end portions of the rotating means 60, the excavating blades of the rotating shaft 60 arranged at the center of the three rotating shafts 60 are arranged at both ends. Further, the two rotary shafts 60 are disposed above the excavating blade. Thereby, since the excavating blade of the rotary shaft 60 arranged in the center does not directly contact the ground, the rotary shaft 60 arranged in the center is compared with the two rotary shafts 60 arranged at both ends. Since the reaction force is small, it is integrated by the rotational force (in the direction of arrow A) of the two rotational shafts 60 arranged at both ends without being affected by the rotational force of the rotational shaft 60 disposed in the center. The three rotation shafts 60 may be twisted in the direction of arrow A in some cases.
When the excavation position of each rotary shaft 60 is measured and construction is managed, the positions of two points set in the three rotary shafts 60 are measured and integrated from the positional relationship of these two points. By calculating the torsion of the entire three rotary shafts 60, the excavation positions of the respective rotary shafts 60 are grasped, so that the measurement of the excavation positions becomes complicated.

  In addition, after excavation and agitation of the excavation groove is completed, the excavation and agitation device is lifted from the excavation groove. At this time, the drive unit and the outer motor arranged below in the excavation groove will be raised, and the resistance force generated between the outer wall surface of the drive unit and the outer motor and the excavation earth and sand will increase, Detachment work from the inside of the excavation groove becomes complicated.

  Therefore, in the conventional ground excavation method, since the entire three rotation shafts may be twisted in the excavation stirring device to be used, there is a problem that the construction accuracy of the excavation groove is lowered. Moreover, since the operation | work which pulls up a multi-axis excavator main body and a rotation means from the inside of a excavation groove becomes complicated by the resistance force by a drive part or an outer motor, there exists a problem that construction efficiency will become low.

  The present invention has been made to solve the above problems, and in the excavating and stirring apparatus to be used, the excavation groove can be efficiently and accurately formed by preventing twisting of the entire three rotating means integrated. It is another object of the present invention to provide a ground excavation method that can be constructed and that can easily pull up each rotating means from the excavation groove.

  The present invention is configured to solve the above problems, and the invention according to claim 1 includes a base machine and three rotating means supported by the base machine so as to be movable up and down. The basic rotating means are integrated with the base machine in parallel. Each rotating means has a fixed shaft and a fixed shaft inserted therein, and an output portion provided with kneading blades around the fixed shaft. By connecting to the hydraulic motor that can rotate around and the output part of the hydraulic motor, it can rotate around the fixed shaft and the concentric shaft, and it has excavating blades at the top and bottom and kneading blades around it A ground excavation method using an excavator and agitation device composed of a rotating shaft, in three rotating means, each hydraulic motor of two rotating means arranged at both ends is rotated in different directions, While excavating the excavation groove with the excavating blade It is characterized by agitating the excavated groove by kneading blades.

Here, the configuration of the base machine is not limited to a self-propelled type or a fixed type as long as it is a device capable of moving the rotating means up and down.
The hydraulic motor is an existing hydraulic motor such as a radial piston motor or an axial piston motor.
Further, the shapes and configurations of the rotary shaft excavating blade and the kneading blade are not limited, and any shape and configuration can be used as long as the excavating groove can be efficiently excavated and the inside of the excavating groove can be reliably stirred.

According to the present invention, in the three rotating means of the excavating and agitating device used in the ground excavation method, by rotating the hydraulic motors of the two rotating means arranged at both ends in different directions, each rotational force is Since they are canceled out, twisting of the entire three rotating means can be prevented, and the moment given to the base machine by the three rotating means can be reduced. As a result, even when the three rotating means are greatly extended downward, excavation can be performed in a stable state, so that a deep excavation groove can be constructed with high accuracy.
In addition, when excavating the ground by sequentially moving the three rotating means, and constructing the excavation groove as a continuous underground wall, one of the rotating means arranged at both ends is connected to the excavation groove. When the ground is excavated by the other rotating means, the reaction force acting on the rotating means excavating the ground is larger than the reaction force acting on the rotating means disposed in the excavation groove. Therefore, the entire three rotating means can be rotated by the reaction force of the rotating means excavating the ground. This is effective when correcting the excavation position.

Furthermore, when the excavation position of each rotation means is measured, in the excavation stirring device used for the ground excavation method, the entire three rotation means are prevented from being twisted. By measuring one installed point, the excavation position of each rotating means can be accurately grasped, and the excavation position can be easily measured.
In addition, since the fixed shaft of the excavator and agitation device used in the ground excavation method does not rotate during excavation, the fixed shaft is extended to the lower part of the excavation groove, and various measuring devices are easily installed on the fixed shaft that does not rotate. It is possible to grasp the excavation state in the groove in real time and accurately manage the construction.
In addition, kneading blades are provided around the output part of the hydraulic motor of the excavator and agitation device used in the ground excavation method, and the output part can rotate around the fixed shaft, so when lifting the rotating means from the excavation groove, By raising the hydraulic motor while rotating the output part around the fixed shaft, it is possible to reduce the resistance force between the hydraulic motor and the excavated sediment, and to cure the excavated sediment and the solidifying agent above the excavated groove. Even if it is advancing, the excavating blade can be crushed and softened by the excavating blade, so that the rotating means can be easily pulled up from the excavation groove.

  The invention described in claim 2 is an invention related to the invention described in claim 1, and includes a base machine and three rotating means supported by the base machine so as to be movable up and down. The rotating means are integrated in a state of being arranged in parallel with the base machine, and among the three rotating means, the rotating means arranged at the center includes a first hydraulic motor and an output portion of the first hydraulic motor. Each of the rotations arranged at both ends in the three rotating means is composed of a rotating shaft provided with excavating blades at the upper part and lower part and provided with kneading blades at the periphery. The means includes a fixed shaft, a fixed shaft inserted therein, and an output portion provided with a kneading blade around the second hydraulic motor that can rotate around the fixed shaft, and an output portion of the second hydraulic motor. , Can rotate around the fixed axis and concentric axis, A ground excavation method using an excavator and agitation device comprising a rotary shaft provided with excavating blades at a part and a lower part and a kneading blade around, and arranged at both ends in three rotating means Each of the second hydraulic motors of the basic rotating means is rotated in different directions so that the excavation groove is excavated by the excavating blade, and the inside of the excavation groove is agitated by the kneading blade.

  Here, the second hydraulic motor in which the output portion rotates around the inserted fixed shaft has a large diameter of the rotating output portion. Therefore, when excavating the viscous soil, there is much adhesion of excavated soil to the output portion. It may become. On the other hand, in the 1st hydraulic motor which rotates the rotating shaft inserted in the output part, since the diameter of a rotating shaft can be made small, adhesion of excavated earth and sand can be decreased. That is, when the clay is stirred by the second hydraulic motor, a larger torque than that of the first hydraulic motor may be required.

  According to this invention, the excavation and agitation device includes the first hydraulic motor suitable for the agitation of the viscous soil, and the second hydraulic motor that has high soil discharge efficiency by the kneading blades provided in the output unit. Therefore, it is possible to construct various soils with high efficiency.

  Further, the invention according to claim 3 is the ground excavation method according to claim 1 or 2, wherein the excavation groove having a predetermined depth is constructed by sequentially lowering the three rotating means by the base machine. In addition, the three rotary means hydraulic motors are arranged in the excavation groove, and while the three rotary means are excavating the ground, a solidifying agent is injected into the excavation groove, and the excavated soil and solidifying agent are mixed with the kneading blades. It is characterized by stirring and mixing.

  According to the present invention, in the excavation and agitation device used in the ground excavation method, since the twist of the entire three rotating means is prevented, even when the rotating means is extended greatly downward, Therefore, it is possible to construct a deep underground wall by excavating a deep excavation groove and mixing the excavated sediment and solidifying agent inside the excavated trench and the solidification agent. it can.

  The invention according to claim 4 is the ground excavation method according to any one of claims 1 to 3, wherein at least one rotating means includes an oil supply path and an oil discharge path of the hydraulic motor. The excavation blade excavates the excavation groove while applying an impact in one direction to the ground by rotating the rotation shaft alternately in one direction and the opposite direction at regular intervals. It is characterized by being.

  Here, when excavating hard ground such as gravel ground, the excavating blade of the rotating means may not be able to dig up the ground, and the rotating shaft may not be able to rotate. Conventionally, in such a case, a method of digging or crushing the ground by applying an impact from above and below to the ground has been used, but it was still difficult to excavate the hard ground. . In addition, it is preferable to give a small impact to the ground. However, if the excavating blade is hit against the ground by repeatedly raising and lowering the rotating means, the base is changed by the change in the center of gravity of the excavating agitator by raising and lowering the rotating means. Since the machine becomes very unstable, it is assumed that it is difficult to raise and lower the rotating shaft at high speed.

  According to the present invention, when the rotating shaft rotating in one direction is rotated in the opposite direction, a gap is generated between the excavation surface with which the excavation blade is in contact and the excavation blade. And again, when the rotating shaft is rotated in one direction, there is little resistance acting on the excavating blade moving the gap in one direction, so the rotating shaft is energized and rotated, The drilling blade is hit against the drilling surface. As a result, it is possible to give an impact to the ground by rotating the rotating shaft without changing the center of gravity of the excavating and stirring device, so that the rotating shaft can be rotated alternately in one direction and the opposite direction at high speed. Thus, the ground can be impacted in small steps at a high speed, so that the excavation ability in the hard ground can be enhanced.

Note that the amount of rotation for rotating the rotating shaft in one direction and the reverse direction is not limited, and it is not necessary to rotate the rotating shaft once in the reverse direction. For example, by rotating several times in the reverse direction during one rotation in one direction and rotating the rotation amount of 1/4 in the reverse direction with respect to the rotation amount in one direction in one direction, Can be dug up and crushed effectively. Then, according to the hardness of the ground to be crushed, set the amount of rotation that rotates the rotation axis in the reverse direction, and adjust the distance generated between the excavation surface and the excavation blade, thereby giving impact force to the ground Therefore, it is possible to efficiently dig up and pulverize soils of various soil types.
Further, by switching between the oil supply path and the oil discharge path of the hydraulic motor every predetermined time, the rotation shaft can be rotated alternately in one direction and the reverse direction, and the rotation shaft can be rotated in the reverse direction. Since it is not necessary to provide the gear mechanism in the hydraulic motor, the rotating means can be configured simply.
In addition, you may comprise so that an electromagnetic switching valve provided in the hydraulic motor may be automatically controlled to switch between an oil supply path and an oil discharge path, and in this configuration, an operator's operation can be simplified.

  The invention according to claim 5 is the ground excavation method according to any one of claims 1 to 3, wherein at least one rotating means rotates in one direction on the rotation shaft. The excavation blade is configured to excavate the excavation groove while applying an impact in one direction to the ground by rotating the rotation shaft in one direction while repeating the increase and decrease of the torque. .

  According to the present invention, the excavation blade is moved to the excavation surface by changing the rotational torque in one direction on the rotation shaft and repeatedly increasing or decreasing the pressure acting on the ground from the excavation blade in contact with the excavation surface. On the other hand, vibration will be given. Thereby, it is possible to give an impact to the ground by changing the rotational torque without changing the center of gravity of the excavating and stirring device. Therefore, without providing a mechanism for rotating the rotating shaft in the reverse direction, it is possible to give a small impact to the ground at a high speed by a device with a simple configuration, and it is possible to increase the excavation ability in the hard ground.

Therefore, in the ground excavation method of the present invention, in the excavation stirring device to be used, twisting of the entire three rotating means is prevented, and even when the rotating means is greatly extended downward, Since excavation and agitation can be performed in a stable state, a deep excavation groove can be constructed with high accuracy. In addition, when the rotating means is pulled up from the excavation groove, the resistance force of the hydraulic motor and the excavation sediment can be reduced, and the excavation sediment above the excavation groove can be crushed. Can be pulled up easily.
In addition, when the excavation blade is configured to give impact to the ground by switching the rotation direction of the rotation shaft at predetermined time intervals or changing the rotation torque of the rotation shaft, the ground is chopped at high speed. Since an impact can be given and the ground can be excavated and crushed effectively, the hard ground can be excavated efficiently.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the description of each embodiment, the same constituent elements are denoted by the same reference numerals, and redundant descriptions are omitted.

  In the present embodiment, the ground is improved by excavating a vertical excavation groove using the ground excavation method of the present invention, injecting a solidifying agent into the excavation groove, and stirring and mixing the excavated soil and the solidifying agent. An example of the case of curing by heating will be described.

[First Embodiment]
First, the ground excavation method according to the first embodiment of the present invention will be described.
FIG. 1 is a side view showing an excavation and agitation device used in the ground excavation method according to the first embodiment of the present invention. FIG. 2 is a front view showing rotating means of the excavation and agitation device used in the ground excavation method according to the first embodiment of the present invention. FIG. 3 is a diagram showing the rotation direction of the rotation shaft of the excavation and agitation device used in the ground excavation method according to the first embodiment of the present invention. FIG. 3 (a) shows that the right rotation unit rotates left and the left rotation unit rotates right. Schematic showing how it is rotating, (b) is a schematic diagram showing how the right rotating means rotates right, and the left rotating means rotates left, and (c) corrects the excavation position. It is the schematic which showed the mode. In the following description, the right side is the right side in FIG. 2, and the left side is the left side in FIG. Furthermore, the counterclockwise rotation is clockwise in FIG. 3A, and the clockwise rotation is counterclockwise in FIG.

First, the structure of the excavation stirring apparatus used for the ground excavation method according to the first embodiment of the present invention will be described.
As shown in FIGS. 1 and 2, the excavating and stirring apparatus 1 includes a base machine 2 and three rotating means 20C, 20R, and 20L supported by the base machine 2 so as to be movable up and down. , 20R, 20L are integrated with the base machine 2 in parallel. Each rotating means 20C, 20R, 20L has a drilling blade 22 and a kneading blade 23, and the drilling blade 22 forms a drilling groove. While excavating, the solidifying agent is injected into the excavation groove, and the ground is improved by mixing and mixing the excavated sediment and the solidifying agent by the kneading blade 23.

Next, the configuration of the base machine 2 will be described.
As shown in FIG. 1, the base machine 2 includes a vertical lifting rail 3, a support member 4 that can be lifted and lowered along the lifting rail 3, a swivel base 5 for swiveling the lifting rail 3 in the horizontal direction, Driven from the tilting means 6 for rotating the elevating rail 3 in the vertical direction, the oil supply pipe 7 for supplying driving oil to the rotating means 20C, 20R, 20L, and the rotating means 20C, 20R, 20L. The oil drain pipe 8 for discharging the oil, the supply pipe 9 for supplying the solidifying agent to the rotating means 20C, 20R, and 20L, and the caterpillar 10 for moving the base machine 2 are configured as main parts. ing.

The turning pedestal 5 is composed of an upper pedestal 5a and a lower pedestal 5b, and an elevating rail 3 is connected to the upper pedestal 5a. By rotating the upper pedestal 5a in the horizontal direction, the elevating rail 3 is moved in the horizontal direction. Can be swiveled.
The retractable means 6 of the elevating rail 3 is an extendable hydraulic cylinder, the lower end portion is connected to the upper pedestal 5a, the upper end portion is connected to the upper end portion of the elevating rail 3, and the retractable means 6 is expanded and contracted. Thus, the elevating rail 3 is rotated in the vertical direction around the rotation support portion 11 provided at the lower end of the elevating rail 3.

  The support member 4 is a member that supports each of the rotating means 20C, 20R, and 20L in a state in which the rotation means 20C can be lifted and lowered in the vertical direction along the lift rail 3. The mechanism for raising and lowering the support member 4 is not limited. In this embodiment, an electric winch (not shown) is installed on the swivel base 5 and the wire 12 of this electric winch is connected to the elevating rail 3. The support member 4 is lifted up by being fixed to the upper end portion of the elevating rail 3 via a pulley 13 installed at the upper end of the rail and a pulley 14 installed at the upper portion of the support member 4, and the wire 12 is drawn out or wound up. The support member 4 is raised and lowered.

  The oil supply pipe 7 and the oil discharge pipe 8 are provided to drive the rotating means 20C, 20R, and 20L, and the rotating means 20C, 20R, and 20L are supplied from an oil tank (not shown) installed at the construction site. To the rotation means 20C, 20R, 20L from the oil tank through the oil supply pipe 7 and the oil discharge pipe 8, and the drive oil discharged from the rotation means 20C, 20R, 20L is oil. It is comprised so that it may collect | recover in a tank. The supply pipe 9 is connected to each rotating means 20C, 20R, 20L from a storage tank (not shown) installed at the construction site, and each rotating means 20C, 20R, 20L from the storage tank through the supply pipe 9. The solidifying agent is supplied to the container.

Next, the configuration of the rotating means 20C, 20R, 20L will be described.
As shown in FIGS. 1 and 2, the excavating and agitating device 1 has three rotating means 20C, 20R, and 20L arranged in parallel to the base machine 2, and a central rotating means 20C disposed in the center and The right rotation means 20R arranged on the right side and the left rotation means 20L arranged on the left side. The rotating means 20C, 20R, and 20L are integrated with the connecting member 24 and the bearing member 25 and are supported by the base machine 2 so as to be movable up and down.

  The central rotating means 20C is arranged in the center among the three rotating means 20C, 20R, and 20L arranged in parallel, and the fixed shaft 30C having the upper end fixed to the connecting member 24 and the fixed shaft 30C pass therethrough. An output portion of the outer motor 40C is provided such that an output portion having a kneading blade 23 around the hydraulic motor (hereinafter referred to as “outer motor”) 40C that can rotate around the fixed shaft 30C and the fixed shaft 30C are inserted. The rotary shaft 21 </ b> C can be rotated around the fixed shaft 30 </ b> C, and the rotary shaft 21 </ b> C is provided with the excavating blade 22 at the upper and lower end portions and the kneading blade 23 around the fixed shaft 30 </ b> C.

  The outer motor 40C of the central rotating means 20C is an outer peripheral drive type radial piston motor whose output portion rotates around the fixed shaft 30C that penetrates. In the first embodiment, the outer motor 40C is substantially at the center in the height direction of the fixed shaft 30C. The output unit is configured to rotate counterclockwise around the fixed shaft 30C in plan view.

  The fixed shaft 30C of the central rotating means 20C is a hollow tube having a through hole in the central part, and a plurality of axial through holes are formed around the through hole in the central part. An air hole for supplying compressed air into the excavation groove, an oil supply hole for supplying drive oil to the outer motor 40C, an oil discharge hole for discharging drive oil from the outer motor 40C, and an outer It is comprised from the drain hole when driving oil flows out inside the motor 40C.

  The rotating shaft 21C of the central rotating means 20C is a hollow tube provided with a kneading blade 23 around it, and is divided into upper and lower parts via an outer motor 40C and has an upper rotating shaft 21Ca provided with an excavating blade 22 at the upper part, and a lower end part. The lower rotary shaft 21Cb having the excavating blade 22 is formed so as to interpolate the fixed shaft 30C. Then, the lower end portion of the upper rotary shaft 21Ca and the upper end portion of the lower rotary shaft 21Cb are connected to the output portion of the outer motor 40C, thereby rotating counterclockwise around the fixed shaft 30C (FIG. 3A). reference). Further, the lower rotary shaft 21Cb penetrates the bearing member 25 in a rotatable state.

Then, the upper rotary shaft 21Ca and the lower rotary shaft 21Cb are rotated by the outer motor 40C, and the earth and sand in the excavation groove can be excavated by rotating the excavating blade 22 installed at the lower end of the lower rotary shaft 21Cb. At the same time, by rotating the excavating blade 22 installed on the upper part of the upper rotary shaft 21Ca, the excavated earth and sand stored above the central rotating means 20C can be crushed. The kneading blade 23 is a spiral member installed around the rotary shaft 21, and can rotate and mix the excavated sediment and the solidifying agent in the excavated groove by rotating.
The configurations of the excavating blade 22 and the kneading blade 23 are not limited, and may be any shape and material that enable efficient excavation and stirring.

  As shown in FIGS. 1 and 2, the right rotation means 20R is arranged on the right side of the three rotation means 20C, 20R, and 20L arranged in parallel, and the upper end portion is fixed to the support member 4 of the base machine 2. The fixed shaft 30R and the fixed shaft 30R pass therethrough, and an outer motor 40R in which an output portion having a kneading blade 23 around the fixed shaft 30R and the fixed shaft 30R are inserted, By being connected to the output part of the motor 40R, it can be rotated around the fixed shaft 30R, and has an excavating blade 22 at the upper and lower ends, and a rotating shaft 21R provided with a kneading blade 23 around it. Yes.

  The outer motor 40R of the right rotation means 20R is an outer peripheral drive type radial piston motor whose output portion rotates around the fixed shaft 30R that penetrates, and is configured such that the output portion rotates counterclockwise around the fixed shaft 30R in plan view. The central rotating means 20C is disposed below the outer motor 40C.

As shown in FIG. 2, the fixed shaft 30 </ b> R of the right rotation means 20 </ b> R is integrated with the central rotation means 20 </ b> C by being fixed to the connection member 24 with the upper portion penetrating the connection member 24.
The fixed shaft 30R is a hollow tube having a through hole in the central portion, and the through hole in the central portion is a supply hole for supplying the solidifying agent into the excavation groove from the lower end portion of the fixed shaft 30R. . Further, a plurality of axial through holes are formed around the central through hole, and each through hole receives compressed air from an air supply means (not shown) in the air hole of the central rotating means 20C. An air hole for supplying, an oil supply hole for supplying driving oil to the oil supply hole of the central rotating means 20C, an oil supply hole for supplying driving oil to the outer motor 40R, and driving from the outer motor 40R It is comprised from the drain hole for discharging oil, and the drain hole when driving oil flows out inside the outer motor 40R.

  Further, the air hole and the oil supply hole of the right rotation means 20R are connected to and communicated with the air hole and the oil supply hole of the central rotation means 20C within the connecting member 24 by a hose or the like. Further, the oil supply hole, the oil discharge hole, and the drain hole of the right rotation means 20R are connected to the outer motor 40R, respectively, and the drain hole is connected to the drain hole of the central rotation means 20C within the connecting member 24 by a hose or the like. Communicate.

Here, since the fixed shafts 30C and 30R do not rotate in the connection between each hole of the right rotation means 20R and each hole of the central rotation means 20C in the connection member 24, a special mechanism such as a swivel joint is installed at the connection portion. There is no need to do.
In addition, a supply pipe 9 is connected to the through hole at the center of the fixed shaft 30R, and further, an oil supply pipe 7 is connected to the oil supply hole, and an oil discharge pipe 8 is connected to the oil discharge hole. Is connected to a drain pipe (not shown). In addition, since the fixed shaft 30R does not rotate in the connection between each hole and each pipe, it is not necessary to install a special mechanism such as a swivel joint at the connection portion.

  The rotating shaft 21R of the right rotating means 20R is a hollow tube having a kneading blade 23 around it. The rotating shaft 21R is divided into upper and lower parts via an outer motor 40R, and includes an excavating blade 22 at the upper portion, an upper rotating shaft 21Ra disposed above the outer motor 40R, and an excavating blade 22 at the lower end portion. The lower rotary shaft 21Rb disposed below the motor 40R is formed so as to interpolate the fixed shaft 30C. Then, the lower end portion of the upper rotary shaft 21Ra and the upper end portion of the lower rotary shaft 21Rb are connected to the output portion of the outer motor 40R, whereby the rotary shaft 21R rotates to the left around the fixed shaft 30C in plan view (see FIG. 3 (a)). Furthermore, the lower rotating shaft 21Rb is integrated with the central rotating means 20C by passing through the bearing member 25 in a rotatable state.

  And each rotary shaft 21Ra, 21Rb is rotated by the outer motor 40R, and the bottom of the excavation groove can be excavated by rotating the excavating blade 22 installed at the lower end of the lower rotary shaft 21Rc, and the upper rotation By rotating the excavating blade 22 installed at the upper part of the shaft 21Ra, the excavated sediment stored above the upper rotating shaft 21Ra can be crushed. Further, by rotating the rotary shaft 21R, the excavated sediment and the solidifying agent in the excavated groove can be agitated and mixed by the rotation of the kneading blade 23 provided around the rotary shaft 21R.

  As shown in FIGS. 1 and 2, the left rotation means 20L is arranged on the left side of the three rotation means 20C, 20R, and 20L arranged in parallel, and the upper end portion is fixed to the support member 4 of the base machine 2. The fixed shaft 30L and the fixed shaft 30L pass therethrough, and an outer motor 40L in which an output portion provided around the kneading blade 23 is rotatable around the fixed shaft 30L and the fixed shaft 30L are inserted so that the outer By being connected to the output part of the motor 40L, it can be rotated around the fixed shaft 30L, and has an excavating blade 22 at the upper and lower ends, and a rotating shaft 21L provided with a kneading blade 23 around it. Yes. The left rotation means 20L has substantially the same configuration as the right rotation means 20R, and is different in that the rotation direction of the output portion of the outer motor 40L is right rotation in plan view, and is connected to the output portion of the outer motor 40L. The rotating shaft 21L thus rotated rotates clockwise around the fixed shaft 30L (see FIG. 3A). That is, in the three rotating means 20C, 20R, 20L, the hydraulic motors 40R, 40L and the rotating shafts 21R, 21L of the two rotating means 20R, 20L arranged at both ends are rotated in different directions. It is configured. Note that the rotation direction of the rotation shafts 21R and 21L of the rotation means 20R and 20L is not limited to the rotation direction, and it is only necessary that the rotation shafts 21R and 21L rotate in different directions. In addition, the rotation directions of the spiral kneading blades 23 provided in the right rotation means 20R and the left rotation means 20L are formed in a state of rotating in opposite directions.

  Further, the fixed shaft 30L of the left rotating means 20L is formed with a plurality of axial through holes around the central through hole in the same manner as the fixed shaft 30R of the right rotating means 20R. Each through hole has an oil drain hole for discharging driving oil from the outer motor 40C of the central rotating means 20C, an oil supply hole for supplying driving oil to the outer motor 40L, and a drive from the outer motor 40L. It is comprised from the oil drain hole for discharging oil, and the drain hole of the outer motor 40L. In addition, the oil drain hole of the left rotating means 20L is connected and communicated with the oil drain hole of the central rotating means 20C through a hose or the like in the connecting member 24.

  Here, in order to construct an excavation groove that becomes a continuous underground wall by the three rotating means 20C, 20R, and 20L arranged in parallel, it is necessary to continue the excavation range of each rotating means 20C, 20R, and 20L, In this embodiment, it is comprised so that a part of excavation range of adjacent rotating means 20C, 20R, 20L may overlap. Therefore, the excavating blade 22 of the right rotating means 20R is disposed below the excavating blade 22 with the central rotating means 20C to prevent interference between the excavating blades 22 of the adjacent rotating means 20C and 20R.

Next, the ground excavation method according to the first embodiment of the present invention will be described.
First, as shown in FIGS. 1 and 2, the base machine 2 is moved to the side of a predetermined position for excavation, and the swivel base 5 and the tilting means 6 are adjusted so that each rotating means 20 is in a vertical state at the predetermined position. Install. Then, the rotating means 20C, 20R, 20L are lowered, and the excavating blades 22 installed at the lower ends of the right rotating means 20R and the left rotating means 20L are brought into contact with the ground surface.

  Subsequently, the outer motors 40C, 40R, and 40L of the rotating means 20C, 20R, and 20L are driven to rotate the rotating shafts 21C, 21R, and 21L, and the ground is excavated by the excavating blade 22 at the lower end portion, so that the base machine The rotating means 20C, 20R, 20L are sequentially lowered by 2 to construct excavation grooves having a predetermined depth, and the outer motors 40C, 40R, 40L of the rotating means 20C, 20R, 20L are arranged in the excavation grooves. .

  Here, in the ground excavation method of the present invention, in the three rotating means 20C, 20R, and 20L of the excavating and stirring apparatus 1 to be used, the hydraulic motors 40R and 40L of the two rotating means 20R and 20L disposed at both ends are used. And each rotating shaft 21R, 21L is rotated in the mutually different direction. As a result, the rotational forces of the two rotating means 20R and 20L arranged at both ends are canceled out, so that the entire three rotating means 20C, 20R and 20L can be prevented from being twisted. The three rotating means 20C, 20R, and 20L can be stabilized at the time and at the time of stirring. Since the excavating blade 22 of the central rotating means 20C is not in direct contact with the ground, the rotational reaction force on the rotating shaft 21C of the central rotating means 20C is small, so the rotational force of the rotating shaft 21C of the central rotating means 20C is small. The rotational force of the two rotating means 20R and 20L arranged at both ends is not affected.

Further, when measuring the excavation position of each rotating means 20C, 20R, 20L, it is not necessary to consider the twist of the entire three rotating means 20C, 20R, 20L, so that the three rotating means 20C. , 20R, 20L by measuring one point installed in the 20L, it is possible to accurately grasp the excavation position, it is possible to easily measure the excavation position.
Furthermore, by installing a measuring device for measuring the position and depth of the rotary shafts 21C, 21R, 21L in the excavation groove at the lower end of the fixed shafts 30C, 30R, 30L, the excavation state in the excavation groove is grasped in real time. When the construction is accurately managed and the excavation groove is constructed with high accuracy, the fixed shafts 30C, 30R, 30L do not rotate during excavation, so the power cable or communication cable of the measuring device is connected to the fixed shafts 30C, 30R, 30L can be wired, and a measuring device can be simply installed in the rotating means 20C, 20R, 20L for measurement.

  On the other hand, the solidifying agent is supplied through the supply pipe 9 to the through holes in the central portions of the right rotation means 20R and the left rotation means 20L while excavating the ground with the rotation means 20C, 20R, 20L. This solidifying agent passes through the through holes in the central portions of the fixed shafts 30R and 30L of the right rotating means 20R and the left rotating means 20L, and is injected into the excavation grooves from the lower ends of the fixed shafts 30R and 30L. Further, compressed air is supplied into the excavation groove from the air hole of the central rotating means 20C.

  The excavated sediment and the solidifying agent are agitated and mixed by the kneading blades 23 of the rotating means 20C, 20R, and 20L. At this time, since the inside of the excavation groove is stirred by the kneading blades 23 of the outer motors 40C, 40R, and 40L together with the kneading blades 23 of the rotary shafts 21C, 21R, and 21L, the stirring can be efficiently performed. Further, since the kneading blades 23 are installed in a wide range in the height direction of the rotating means 20C, 20R, 20L by the kneading blades 23 of the outer motors 40C, 40R, 40L, the excavated sediment is efficiently discharged upward. can do.

  In addition, as shown in FIG. 3C, when the three rotating means 20C, 20R, and 20L are moved to excavate the ground, and the excavation groove K that becomes a continuous underground wall is constructed, When the excavation positions of the rotating means 20C, 20R, and 20L are shifted from the straight line upward in FIG. 3 (c), the right rotating means 21R in the two rotating means 20R and 20L arranged at both ends. Is placed in the excavation groove K and rotated in the B direction, and the right rotation means 21L is rotated in the A direction to excavate the ground. As a result, the reaction force acting on the left rotation means 21L excavating the ground becomes larger than the reaction force acting on the right rotation means 20R disposed in the excavation groove K, and therefore the reaction force of the left rotation means 20L. The three rotation means 20C, 20R, and 20L as a whole can be rotated in the B direction, and the excavation position can be easily corrected.

  Finally, the rotating means 20C, 20R, and 20L are raised and pulled up from the excavation groove while mixing the excavated earth and the solidifying agent with stirring. At this time, since the resistance force between the outer motors 40C, 40R, 40L and the excavated earth and sand is reduced by raising the output portions of the outer motors 40C, 40R, 40L provided with the kneading blades 23 while rotating, It can be easily pulled up from the excavation groove. Further, even when the hardening of the excavated soil has progressed above the excavation groove, the excavated earth and sand are crushed and softened by the excavating blades 22 installed at the upper portions of the rotary shafts 21C, 21R, and 21L. Therefore, it can be easily pulled up from the excavation groove. Then, after the rotation means 20C, 20R, and 20L are detached, hardening of the excavated earth and sand in the excavation groove is completed and the ground is improved.

  Therefore, in the ground excavation method of the present invention, in the excavation and agitation device 1 to be used, the three integrated rotating means 20C, 20R and 20L are prevented from being twisted, and the rotating means 20C, 20R and 20L are connected to each other. Even when extended greatly downward, excavation and agitation can be performed in a stable state, so that a deep excavation groove can be constructed with high accuracy. Further, when each rotating means 20 is detached from the excavation groove, it can be easily pulled up, and furthermore, it can be efficiently stirred by the kneading blades 23 provided around the outer motor 40, so that the construction efficiency is increased. be able to.

[Second Embodiment]
Next, a ground excavation method according to the second embodiment of the present invention will be described.
FIG. 4 is a front view showing a rotating means of the excavation and agitation device used in the ground excavation method according to the second embodiment of the present invention.

The ground excavation method according to the second embodiment of the present invention has substantially the same configuration as the ground excavation method according to the first embodiment, and as shown in FIG. The configuration is different.
The central rotating means 20C ′ of the excavating and agitating apparatus according to the second embodiment has a hydraulic motor integrated with the right rotating means 20R and the left rotating means 20L by fixing the outer peripheral portion to the connecting means 24 (hereinafter referred to as “inner”). Motor 50) and a rotary shaft 21C that can be rotated by passing through the output portion of the inner motor 50, has an excavating blade 22 at the upper and lower ends, and a kneading blade 23 around it. ing.

Here, since the outer motors 40R and 40L have a large diameter of the rotating output part, when the ground to be excavated is a clay soil, the adhesion of the excavated soil to the output part may increase. Therefore, even when the clay is excavated and stirred by installing the inner motor 50 connected to the lower rotating shaft 21C having a small diameter and less sticking of excavated earth and sand to the central rotating means 20C ′, Since the excavating soil can be efficiently excavated by the rotating means 20C ′ and discharged efficiently by the right rotating means 20R and the left rotating means 20L, various soils can be efficiently constructed.
Further, since the inner motor 50 can be formed smaller than the outer motors 40R and 40L, the interval between the right rotation means 20R and the left rotation means 20L can be reduced. Moreover, since the inner motor 50 is less expensive to manufacture than the outer motors 40R and 40L, the manufacturing cost of the excavating and stirring device can be reduced, and the construction cost can be reduced.

[Third Embodiment]
Next, a ground excavation method according to a third embodiment of the present invention will be described.
FIG. 6 is a view showing the rotation direction of the rotation shaft of the excavation and agitation device used in the ground excavation method according to the third embodiment of the present invention. FIG. The figure which showed a mode that the impact was given, (b) is a figure which showed a mode that the impact was given with respect to the ground by the left side rotation means and the center rotation means.

The excavation and agitation device used in the ground excavation method according to the third embodiment of the present invention has substantially the same configuration as the ground excavation method according to the first embodiment or the second embodiment, and the rotation method of each rotating means is different. ing.
In the ground excavation method according to the third embodiment, as shown in FIG. 6A, electromagnetic switching for switching the oil supply path and the oil discharge path to the hydraulic motors of the right rotation means 20R and the left rotation means 20L. A valve is provided, and the electromagnetic switching valve is automatically controlled. Then, when excavating hard ground such as gravel ground, the oil supply path and the oil discharge path of the hydraulic motor are switched at predetermined time intervals by the electromagnetic switching valve so that the rotating shafts 21R and 21L are moved in one direction C, C ′. By rotating alternately in the reverse directions D and D 'and applying an impact in one direction C and C' to the ground by the excavating blade, the excavation groove is excavated while excavating or crushing the ground. ing.
Note that the amount of rotation by which the rotation shafts 21R and 21L are rotated in one direction C and C ′ and the opposite directions D and D ′ is not limited. For example, during one rotation in one direction C and C ′. The rotation in the reverse directions D and D ′ is performed several times, and the rotation amount of 1/4 is rotated in the reverse directions D and D ′ with respect to the rotation amount in one direction C and C ′. The ground can be dug up and crushed effectively.

More specifically, when the rotating shafts 21R and 21L rotate 15 times per minute, first, the rotating shafts 21R and 21L are rotated in one direction C and C ′ for 1.6 seconds. One direction C of the rotation shaft 21R of the right rotation means 20R is left rotation, and one direction C ′ of the rotation shaft 21L of the left rotation means 20L is right rotation.
Next, the rotating shafts 21R and 21L rotating in one direction C and C ′ are rotated in the reverse directions D and D ′ for 0.4 seconds. That is, the ratio of the rotation in one direction C, C ′ and the rotation in the reverse direction D, D ′ in one rotation is 8: 2. This rotation in the reverse directions D and D ′ creates a gap between the excavation surface and the excavation blade.
When the rotary shafts 21R and 21L are rotated again in one direction C and C ', the resistance acts on the excavating blade moving the gap in the one direction C and C' is small. As the shafts 21R and 21L are energized and rotated, the excavation blade is hit against the excavation surface.

After that, by rotating the rotating shafts 21R, 21L in one direction C, C ′ and the opposite direction D, D ′ every predetermined time in the same manner as in the rotating method, without changing the center of gravity of the excavating and stirring device. The impact can be repeatedly applied to the ground by the rotation operation of the rotation shafts 21R and 21L.
As a result, the base machine is stabilized when the ground is struck, so that the rotary shafts 21R and 21L are alternately rotated at high speed in one direction C and C ′ and in the opposite direction D and D ′, and the ground is chopped at high speed. The hard ground can be dug up or crushed by giving an impact to the ground, and the ground is rotated at a torque of 60% to 80% when the rotary shafts 21R and 21L are continuously rotated in one direction C and C '. Can be excavated.
Even if gravel is clogged between the rotary shafts 21R and 21L, the rotary shafts 21R and 21L are excluded when the rotary shafts 21R and 21L periodically rotate in the reverse directions D and D ′. You can excavate efficiently.

Note that the amount of rotation in one direction and the reverse direction is not limited, and the amount of rotation for rotating the respective rotation shafts 21R, 21L in the reverse directions D, D ′ is set according to the soil soil to be crushed. And by adjusting the space | interval which arises between an excavation surface and an excavation blade, the impact force given with respect to the ground can be adjusted, and the ground of various soils can be excavated efficiently. For example, when the ratio of one direction C, C ′ to the opposite direction D, D ′ is 8: 2 in one rotation as in the rotation method, or one direction C, C in one rotation. For example, when the impact force is increased by setting the ratio of 'and reverse directions D and D' to 7: 3, it is adjusted as appropriate according to the soil texture.
In addition, without automatically providing a gear mechanism for rotating the rotary shafts 21R and 21L in the reverse directions D and D ′ in the hydraulic motor, by automatically controlling the electromagnetic switching valve provided in the hydraulic motor, the rotary shafts 21R and 21R, Since the rotation direction of 21L is changed, the configuration of the apparatus can be simplified and the operation of the operator can be simplified.

  Further, by rotating the rotary shafts 21R, 21L intermittently in one direction C, C ′, the excavation blade excavates the excavation groove while applying an impact in one direction C, C ′ to the ground. You may comprise. In this configuration, the rotary shafts 21R and 21L rotating in one direction C and C ′ in the ground try to rotate in the vicinity of the hydraulic motor in advance by the resistance force of the excavating blade excavating the ground. Since the rotation shafts 21R and 21L are twisted in one direction C and C ′, when the rotation of the rotation shafts 21R and 21L is stopped, the rotation shafts 21R and 21L The whole rotates slightly in the reverse directions D and D ′ in an attempt to eliminate the twist in one direction C and C ′. That is, a gap is generated between the excavation surface with which the excavation blade is in contact with the excavation blade, and the excavation blade is excavated by rotating the rotary shafts 21R and 21L in one direction C and C ′ again. It is not necessary to provide a mechanism for rotating the rotary shafts 21R and 21L in the reverse directions D and D ′ because they are hit by the surface.

  Further, the rotation method of the rotation shaft in the third embodiment is not limited to the configuration in which the right rotation means 20R and the left rotation means 20L are rotated, and as shown in FIG. 6B, the left rotation means 20L. And the central rotating means 20C may be configured to rotate. In this configuration, the interval between the rotating means 20L and 20C is reduced, and an impact can be concentrated on the ground. Digging and crushing can be performed more effectively. Of course, the same effect can be obtained when the right rotating means 20R and the central rotating means 20C are configured to rotate. Furthermore, the rotation direction of the central rotation means 20C may be alternately changed while the right rotation means 20R and the left rotation means 20L are continuously rotated in one direction. In this configuration, the excavation efficiency of the ground can be increased because the gravel moved below the central rotation means 20C by excavation by the right rotation means 20R and the left rotation means 20L can be impacted.

  Further, the rotary shafts 21C, 21R, 21L are rotated in one direction while repeatedly increasing / decreasing the rotational torque in one direction C, C ′ on the rotary shafts 21C, 21R, 21L of the rotating means 20C, 21R, 21L. Thus, the excavation blade may excavate the excavation groove while applying an impact in one direction to the ground. In this configuration, the pressure acting on the ground from the excavation blade that is in contact with the excavation surface repeatedly increases and decreases, so that the excavation blade can move relative to the excavation surface without changing the rotation direction of the rotary shafts 21C, 21R, and 21L. Vibrations can be applied, and impacts can be applied to the ground by changes in rotational torque. Therefore, without providing a mechanism for rotating the rotary shafts 21C, 21R, and 21L in the reverse direction, a device having a simple configuration can impact the ground at a high speed in small increments, and enhance the excavation ability in the hard ground. be able to.

As mentioned above, although an example about the suitable embodiment of the present invention was explained, the present invention is not limited to the above-mentioned embodiment, and design change is possible suitably in the range which does not deviate from the meaning of the present invention.
For example, in the three rotating means 20C, 20R, and 20L of the excavating and agitating device 1 used in the ground excavation method, the rotational directions of the two rotating means 20R and 20L arranged at both ends are different from each other. Alternatively, the rotation shaft 21R of the right rotation means 20R may be rotated to the right and the rotation shaft 21L of the left rotation means 20L may be rotated to the left (see FIG. 3B). Note that the rotational force of the central rotating means 21C does not affect the rotational forces of the two rotating means 20R and 20L arranged at both ends, so the rotational direction can be set arbitrarily.

Moreover, in the excavation stirring apparatus 1 used for the ground excavation method, the number of outer motors 40 or inner motors 50 installed in the rotating means 20C, 20R, 20L is not limited, and corresponds to various construction conditions such as soil soil quality. Therefore, it is preferable to perform excavation and stirring efficiently by setting appropriately. Specifically, two outer motors 40, 40 are provided at predetermined intervals in the vertical direction, the upper outer motor 40 rotates the upper rotary shafts 21Ca, 21Ra, 21La, and the lower outer motor 40 lowers the lower rotary shaft 21Cb. , 21Rb, 21Lb may be rotated for efficient excavation and agitation.
Furthermore, as shown in the front view of FIG. 5, as other configurations of the right rotation means 20R and the left rotation means 20L, outer motors 40R and 40L whose output portions can rotate around fixed shafts 30R and 30L, and fixed shafts You may comprise so that inner motor 50R, 50L fixed to the lower end part of 30R, 30L may be provided. In the ground excavation method using the excavator agitation device, the lower rotary shafts 21Rb and 21Lb connected to the inner motors 50R and 50L are rotated to excavate excavated sediment efficiently, and the upper motors 40R and 40L efficiently discharge the excavated soil. Can be soiled.

It is the side view which showed the excavation stirring apparatus used for the ground excavation method which concerns on 1st Embodiment of this invention. It is the front view which showed the rotation means of the excavation stirring apparatus used for the ground excavation method which concerns on 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is the figure which showed the rotation direction of the rotating shaft of the excavation stirring apparatus used for the ground excavation method which concerns on 1st Embodiment of this invention, (a) is a left rotation means rotating left and a left rotation means rotating right. Schematic diagram showing the situation, (b) is a schematic diagram showing the right rotation means rotating right, and the left rotation means is rotating left, and (c) shows the excavation position being corrected. FIG. It is the front view which showed the rotation means of the excavation stirring apparatus used for the ground excavation method which concerns on 2nd Embodiment of this invention. It is the front view which showed the other structure of the rotation means of the excavation stirring apparatus used for the ground excavation method which concerns on embodiment of this invention. It is the figure which showed the rotation direction of the rotating shaft of the excavation stirring apparatus used for the ground excavation method which concerns on 3rd Embodiment of this invention, (a) is a mode that impacts with respect to the ground by the right side rotation means and the left side rotation means (B) is a figure which showed a mode that an impact is given with respect to the ground by the left side rotation means and the center rotation means. It is the schematic which showed the rotation direction of the rotating shaft of the excavation stirring apparatus used for the conventional ground excavation method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavation stirring apparatus 2 Base machine 20C Central rotation means 20R Right rotation means 20L Left rotation means 21C Rotating shaft (central rotation means)
21R Rotating shaft (Right-side rotating means)
21L Rotating shaft (Left side rotating means)
22 excavating blade 23 kneading blade 30C fixed shaft (central rotating means)
30R fixed shaft (right rotation means)
30L fixed shaft (left rotation means)
40C outer motor (central rotating means)
40R outer motor (right rotation means)
40L outer motor (left rotation means)
50 Inner motor

Claims (5)

A base machine,
Three rotating means supported by the base machine to be movable up and down,
The three rotating means are integrated with the base machine in parallel.
Each rotating means includes
A fixed shaft;
A hydraulic motor in which the fixed shaft is inserted, and an output portion provided with a kneading blade around is rotatable about the fixed shaft;
By being connected to the output portion of the hydraulic motor, the rotary shaft is rotatable about a concentric shaft with the fixed shaft, and provided with excavating blades at the upper and lower portions, and a rotating shaft provided with the kneading blades around. A ground excavation method using a configured excavating and stirring device,
In the three rotation means, the hydraulic motors of the two rotation means arranged at both ends are rotated in different directions to excavate a excavation groove with the excavation blade, and the excavation with the kneading blade. A ground excavation method characterized by stirring in a groove. A base machine,
Three rotating means supported by the base machine to be movable up and down,
The three rotating means are integrated with the base machine in parallel.
In the three rotating means, the rotating means arranged at the center is:
A first hydraulic motor;
It is rotatable by being inserted into the output part of the first hydraulic motor, and comprises an upper and lower excavating blades, and a rotating shaft provided with a kneading blade around.
In the three rotation means, each of the rotation means arranged at both ends is
A fixed shaft;
A second hydraulic motor in which the fixed shaft is inserted, and an output portion provided around the kneading blade is rotatable around the fixed shaft;
By connecting to the output portion of the second hydraulic motor, the rotary shaft can rotate about the concentric shaft with the fixed shaft, and includes the excavating blades at the upper and lower portions, and the kneading blades around the rotating shaft. A ground excavation method using an excavation and stirring device comprising:
In the three rotation means, the second hydraulic motors of the two rotation means arranged at both ends are rotated in different directions, the excavation blades are excavated, and the kneading blades A ground excavation method comprising stirring the inside of the excavation groove.   The three rotation means are sequentially lowered by the base machine to construct the excavation groove having a predetermined depth, the hydraulic motor of the three rotation means is disposed in the excavation groove, and the three The excavating soil and the solidifying agent are stirred and mixed by the kneading blade while injecting the solidifying agent into the excavation groove while excavating the ground with the rotating means. Ground excavation method.   The at least one rotating means switches the oil supply path and the oil discharge path of the hydraulic motor at predetermined time intervals, and rotates the rotating shaft alternately in one direction and in the opposite direction, whereby the excavating blade The ground excavation method according to any one of claims 1 to 3, wherein the excavation groove is excavated while applying an impact in the one direction to the ground.   At least one of the rotating means rotates the rotating shaft in one direction while repeatedly increasing or decreasing the rotational torque in one direction on the rotating shaft, so that the excavating blade moves the one of the rotating shafts relative to the ground. The ground excavation method according to any one of claims 1 to 3, wherein the excavation groove is excavated while applying an impact in a direction.

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