JP2001254392A - Agitating/mixing-type soil improving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform smooth, reliable, and efficient soil improving treatments even if earth and sand in any condition or state are supplied to a treating mechanism part and to prevent the oversupply state of a mixed material in the introducing part of the treating mechanism part. SOLUTION: The end part of a material transferring conveyer 10 to transfer earth and sand from an earth/sand hopper 20 and a soil improving material from a soil improving material hopper 30 is connected to the introducing opening 62 of a mixing container 60 in the mixing treating mechanism part 4, and the sand, earth, and soil improving material are transferred and discharged from a discharge opening 63 as being agitated and mixed by a paddle mixer 64. The paddle mixer 64 is driven by an oil hydraulic motor 70 for agitation and mixing, and the material transferring conveyer 10 is driven by an oil hydraulic motor 102 for transferring. When the load of the oil hydraulic motor 70 is increased to lower its number of rotations, the amount of supply of the mixed material by the material transferring conveyor 10 is correspondingly reduced to set the amount of supply of the mixed material in the mixing container 60 in such a way that it is not oversupplied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agitation / mixing type soil improvement machine used for improving soft ground and strengthening the ground, and improving the quality of earth and sand to meet a predetermined purpose. It is.

[0002]

2. Description of the Related Art For example, in burying gas pipes, water and sewage works, other road works, foundation works, and the like, it is desirable to backfill soil generated by excavation. However, the generated soil has various properties and states, and soil that is not suitable for backfilling performs soil improvement. For example, when the soil itself is soft, such as soil generated at the site of ground improvement work, which is extremely fine, clay soil with high viscosity, and soil that hardens due to excessive weathering,
If the generated soil is backfilled, land subsidence or the like may occur.

[0003] The soil improvement treatment for solidifying the soil is performed by mixing the soil and the soil improvement material. A typical mixing method of the soil and the soil improvement material is a mixing method using a stirring means. And a crushing method provided with a rotary striker are conventionally known. The mixing method is
A stirring means is provided in the tank, and the earth and sand and the soil improving material are charged into the tank and uniformly stirred and mixed by the stirring means. For example, a mixing type soil improvement machine disclosed in Japanese Patent Application Laid-Open No. 10-317426 is known. This conventional soil improvement machine has a configuration in which a rotary mixing means such as a paddle mixer or a screw mixer is provided inside a mixing vessel. The rotary mixing means exerts a function of stirring and mixing while transferring earth and sand, which is a mixed material, and a soil improvement material in a mixing vessel. Therefore, the mixed material is introduced from one side of the mixing vessel, and the mixed material is stirred and mixed by operating the rotary mixing means to produce improved soil, which can be discharged from the other side of the mixing vessel. Therefore, there is an advantage that the soil improvement treatment can be continuously performed, the treatment efficiency is remarkably increased, and the quality of the generated improved soil is extremely good.

[0004]

The above-mentioned prior art soil improvement machine is provided with means for excavating earth and sand, and the earth and sand is supplied directly to the mixing vessel constituting the processing mechanism by the excavating means. ing. However, if the processing mechanism is not provided with a means for directly supplying earth and sand, the earth and sand is separately supplied from a machine such as a hydraulic shovel or a belt conveyor. Accordingly, this type of soil improvement machine is provided with a soil supply means and a soil improvement material supply means, and a mixing vessel which constitutes a processing mechanism using a material transport conveyor for the soil and the soil improvement material individually supplied from these means. And lead them into.

[0005] Here, in order to efficiently perform the soil improvement processing by the soil improvement machine, it is necessary to supply as much of the mixed material as possible to the mixing container constituting the processing mechanism. Therefore, it is general that the material conveying conveyor supplies the earth and sand and the soil improvement material in an amount corresponding to the processing capacity of the processing mechanism section, thereby maximizing the processing capacity of the processing mechanism section. is there. Since the rotary mixing means is used, the transfer amount in the mixing container depends on the rotation speed of the rotary mixing means. Therefore, the rotary mixing means is rotated at the maximum rotation speed on condition that the earth and sand and the soil improvement material are evenly mixed, and an amount corresponding to the transfer amount of the mixed material at this rotation speed is used. If the mixing amount is set to be supplied to the mixing container, the soil improvement processing can be performed most efficiently.

[0006] By the way, the properties and conditions of the earth and sand to be subjected to the soil improvement treatment are various. For example, in a weathered sandy soil, since the viscosity is low or almost non-viscous, the rotary mixing means is maintained at the set maximum number of revolutions, and is mixed and stirred with the soil improvement material. Can be performed smoothly and efficiently. However, when the clay soil flows into the mixing vessel, the soil cannot be transported smoothly in the discharge direction because the soil is attached to the rotary mixing means. The number may decrease. In addition, when sediment containing pebbles and large-size rubble flows into the mixing vessel, it gets caught between the rotary mixing means and the inner surface of the mixing vessel and the like, and the rotating load increases, and the number of rotations increases. It may be lower.

As described above, the rotation speed of the rotary mixing means operating in the mixing vessel fluctuates depending on the nature and condition of the supplied soil and the like, and the amount of discharged improved soil generated Fluctuates. Therefore, if the supply amount of the mixed material by the mixed material transport conveyor is maintained at a setting corresponding to the improved soil discharged from the mixing vessel at the maximum rotation state of the rotary mixing means, when the operation state of the rotary mixing means changes. Then, the mixed material to the mixing container is in an excessive supply state, and in a severe case, the mixed material overflows from the introduction portion of the mixing container. Therefore, it is necessary to stop the mixed material transporting conveyor before such a state occurs. This soil improvement machine is manned,
Moreover, if the operator can always check the inside of the mixing container, the mixed material transporting conveyor can be stopped before the mixed material overflows from the mixing container. However, if the mixing container cannot be checked even if the user operates, such a situation cannot be dealt with. Also, if the mixed material transport conveyor is stopped and the operation of the rotary mixing means is continued, the remaining amount in the mixing container is reduced,
Since a new mixed material is not supplied, it is not always desirable from the viewpoint of the efficiency of the soil improvement treatment.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a smooth and reliable method for supplying soil and sand under any conditions and conditions to a processing mechanism. It is an object of the present invention to efficiently perform soil improvement processing and prevent a situation in which a mixed material is excessively supplied to an introduction portion of a processing mechanism.

[0009]

In order to achieve the above-mentioned object, the present invention conveys a mixed material comprising earth and sand supplied from earth and sand supply means and a soil improvement material supplied from soil improvement material supply means. And a processing mechanism for producing an improved soil by mixing the mixed material supplied from the mixed material conveying conveyor. The processing mechanism is configured to stir and mix the mixed material flowing from the introduction section. Agitating to transfer the generated improved soil from the discharge section
Detecting means for detecting the state of discharge of the improved soil in the processing mechanism section, comprising: mixing means; and driving means for the mixing means; And a control means for changing the threshold value.

Here, as a configuration of the earth and sand supply means, for example, an earth and sand is intermittently introduced like a hydraulic shovel or the like.
It is also composed of a sand hopper to which earth and sand are continuously supplied from a belt conveyor or the like. On the other hand, the soil improvement material supply means includes a container for storing a predetermined amount of the soil improvement material, and supplies the soil improvement material to the mixed material transport conveyor from this container. Therefore, even when the feed speed of the mixed material transport conveyor changes, if the same amount of soil improvement material is supplied, the mixing ratio will change. To prevent this,
The soil improvement material supply means may be provided with a soil improvement material supply amount adjusting means, and may be configured to adjust the supply amount of the soil improvement material by the supply amount adjustment means according to the feed speed of the mixed material transport conveyor. Good. When the soil improving material supply means is configured to include a feeder having a rotor,
The rotor is driven by a motor, and the supply amount adjusting means changes the rotation speed of the motor.

The structure of the processing mechanism is as follows:
Rotary mixing means mounted in the mixing container and stirring and mixing while transferring the mixed material in a predetermined direction,
And a motor for driving the rotary mixing means. In this case, the detecting means for detecting the discharged state of the improved soil may be configured to detect at least one of the number of rotations of the rotary mixing means and the load of the motor. When this motor is constituted by a hydraulic motor for stirring and mixing, the detecting means can be constituted by detecting the discharge pressure of the hydraulic motor. On the other hand, the mixed material conveying conveyor can be constituted by a hydraulic motor. In this case, the control means reduces the supply flow rate to the conveying hydraulic motor when the discharge pressure of the stirring / mixing hydraulic motor increases. It is desirable to adopt a configuration in which adjustment is performed as follows.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 and FIG. 2 show the entire configuration of the soil improvement machine. In the drawing, reference numeral 1 denotes a lower traveling body, and the lower traveling body 1 includes crawler-type means having left and right crawler belts 1a. It should be noted that other traveling means such as a wheel type may be used, and a stationary soil improvement machine having no traveling means may be configured.

A body frame 2 constituting a chassis is installed on the lower traveling body 1, and the body frame 2 is provided with a mixed material supply section 3, a mixing processing mechanism section 4, an improved soil discharge section 5, and the like. ing. From the viewpoint of the processing flow, the arrangement position of the mixed material supply unit 3 is on the front side and on the upstream side. That is, from the front of the main body frame 2, the mixed material supply unit 3, the mixing processing mechanism unit 4, and the improved soil discharge unit 5 are arranged, and the mixed material supply direction in the mixed material supply unit 3 is obliquely upward.
The mixed material is supplied to the mixing mechanism 4 from above.
Since the improved soil generated by the mixing mechanism 4 is discharged downward, the improved soil discharging unit 5 extends to a position below the mixing mechanism 4. The improved soil discharged to the improved soil discharging section 5 is conveyed diagonally upward. Further, a machine room 6 in which machines such as an engine, a hydraulic pump, and a direction switching valve unit are built is provided at an upper position of the mixing processing mechanism unit 4.

From the mixed material supply unit 3, a mixed material composed of earth and sand and a soil improvement material is supplied to the processing mechanism unit 4 in a state where the mixing ratio is controlled. The mixed material supply unit 3 has a material transport conveyor 10, and a sand hopper 20 as soil improvement material supply means is installed on the upstream side of the material transport conveyor 10 in the transport direction, and soil improvement as soil improvement material supply means is performed. The material hopper 30 is installed downstream of the earth and sand hopper 20.

FIG. 3 shows an exploded structure of the soil improvement mechanism. The material transport conveyor 10 is provided to be inclined so as to rise from the front end side of the main body frame 2 by a predetermined angle. The material transport conveyor 10 has a transport belt 11, and the transport belt 11 is a driving wheel 1 supported on a frame 12.
3 and the driven wheel 14.
On the side, a well-known tension adjusting mechanism is provided. In order to support the conveying surface of the conveying belt 11, guide rollers 15 are provided at a predetermined pitch interval below the conveying surface.
Is provided. Further, regulating plates 16, 16 are provided at positions on the left and right sides of the conveying surface of the conveying belt 11 at positions upstream of the mounting portion of the earth and sand hopper 20. This determines the amount of earth and sand transported.

The earth and sand hopper 20 is configured as shown in FIGS. The earth and sand hopper 20 is formed of a substantially frame-shaped member, and has upper and lower openings. The earth and sand hopper 20 has an upper end fixed to a support member 17 erected on the main body frame 2, and a lower end thereof is inclined at an angle corresponding to the inclination angle of the material conveyor 10. Of the four circumferential walls constituting the earth and sand hopper 20, the wall surface 20a located on the upstream side of the material conveyor 10 faces the surface of the conveyor belt 11 with a very small gap, and the wall surfaces 20b on both sides. , 20c are in contact with the regulating plate 16 of the material conveying conveyor 10. As a result, the end portion of the material conveying conveyor 10 is substantially closed by the wall surfaces 20a, 20b and 20c of the earth and sand hopper 20 except for the downstream side.

The lower end of the wall surface 20d located on the downstream side in the feed direction of the material conveying conveyor 10 in the earth and sand hopper 20 is disposed at substantially the same height as the height of the regulating plate 16. It functions as the mouth 21. Further, a pressure roller 22 provided with a large number of pressing claws 22a on the outer peripheral surface is provided on the outer surface side (or the inner surface side) of the wall surface 20d of the earth and sand hopper 20, and the pressure roller 22 has an action of its own weight or A predetermined pressure is applied to the earth and sand that has passed through the supply port 21 by an urging means such as a spring. Accordingly, the transport speed of the transport belt 11 on the material transport conveyor 10 and the supply port 21
And a certain amount of earth and sand determined by the pressing area of the pressure roller 22 is supplied.

A sieve unit 2 is provided above the earth and sand hopper 20.
The sieve unit 23 removes solid foreign matters such as rocks, concrete, metal lumps, etc., and reduces the bulk density of the earth and sand so that sufficient air is contained inside the earth and sand. Thus, the material is dropped onto the conveyor belt 11 so that the material conveyor 10 can smoothly transport the earth and sand with a light load. As shown in FIGS. 6 and 7, the sieve unit 23 has a frame 24, and the frame 24 has a structure in which lattice members 25 are arranged vertically and horizontally at a predetermined pitch. Therefore, a mesh is formed by the vertical and horizontal pitch intervals of the grid member 25, and those having a particle size of this mesh size are selected and guided into the earth and sand hopper 20, and solid foreign matters and the like remain on the grid member 25. .

Here, the sieve unit 23 may be configured as a fixed sieve, but is preferably a vibrating sieve. There are various modes for configuring as a vibrating sieve, but in the illustrated configuration, the sieve unit 23 is vibrated substantially vertically. For this purpose, spring receiving members 26 are fixedly provided at the four corners of the frame 24, and the spring 2 is provided between the supporting member 17 and the spring receiving members 26.
The frame 24 is elastically supported by the support member 17. Then, the vibration member 28 is attached to the lattice member 25.
Are connected, and the vibrating means 28 drives the lattice member 25 mounted on the support frame 24 to move up and down. The vibrating means 28 includes a vibrating member 28b rotationally driven by a motor (electric motor or hydraulic motor) 28a.
The vibration member 28b is formed of a rotating drum, and the center of gravity of the rotating drum is eccentric from the center of rotation.
The vibrating members 28b are connected to both ends of a rotating shaft 28c disposed so as to penetrate the frame 24. When one of the vibrating members 28b is driven to rotate by the motor 28a, both the vibrating members 28b rotate. In this case, since the position of the center of gravity of the vibration member 28b moves at this time, the lattice member 25 vibrates almost vertically.

Next, a soil improving material hopper 30 arranged downstream of the material transporting conveyor 10 in the soil transport direction.
As shown in FIGS. 8 to 13, is supported by a frame-shaped base plate 32 provided on four (or three) columns 31 erected on the main body frame 2. Accordingly, the material transport conveyor 10 extends between the columns 31, 31. The soil improving material is added to the earth and sand conveyed on the material conveying conveyor 10 from the soil improving material hopper 30.
Here, the soil improvement material is mixed in order to improve the soil and sand, and a material suitable for the purpose of each soil improvement and improvement is used. For example, when used as ground improvement or backfill soil, lime or cement, or a mixture of these with various additives for promoting solidification is used. Further, in the case of modifying the soil of the ground or the acid soil, etc., an appropriate soil improving material is supplied.

The soil improving material hopper 30 is provided with a storage container 33 for storing a predetermined amount of the soil improving material, and is connected to the lower portion of the storage container 33. And a feeder 34 for supplying Here, the storage container 33 has a space for storing the soil improvement material therein, but in the present embodiment, the volume is variable by changing the height dimension. However, a general tank may be used. In order to make the height variable, the storage container 33 has a lower portion installed on the base plate 32 and a base portion 35 having an open upper end, a top plate portion 36, and the base portion 35 and the top plate portion 36. And a bellows portion 37 provided therebetween. The base portion 35 and the top plate portion 36 are formed of a hard member such as a steel plate.
Is a flexible sheet 37a which expands and contracts in the vertical direction.
Are fixed with a ring-shaped support bone 37b in the vertical direction. When the bellows portion 37 is extended, the operation state shown in FIG. 8 is established, and a large amount of soil improvement material can be stored inside. FIG. 10 shows the storage state of the bellows portion 37. When the storage state is set in this manner,
The height of the soil improvement machine is reduced.

As shown in FIG. 11, the base 35 of the storage container 33 is composed of a bottom plate 35a and a peripheral body 35b.
Is provided. The stirring member 38 in the hopper includes a stirring blade 38a disposed near the bottom plate 35a inside the base portion 35, a rotating shaft 38b connected to the stirring blade 38a and extending downward through the bottom plate 35a. A motor 38c for driving the rotation shaft 38b to rotate. The in-hopper stirring member 38 is for supplying the soil improving material to the feeder 34 through the communication hole 39 formed in the base 35 of the storage container 33 smoothly. Also, 40
Is an openable and closable inspection door 4 on the peripheral body 35b of the base 35.
Numerals 0 and 39a are outlets for the soil improvement material.

A substantially circular opening 3 is formed at the center of the top plate 36.
6a is formed, and an openable and closable lid 41 is formed above the opening 36a. Further, at positions outside the opening / closing lid 41, at least three hook locking members 42 are provided. Then, the opening / closing lid 41 of the top plate 36
As shown in FIGS. 12 and 13, a cutter 43 supported by the cutter supporting portion 43a is provided below the portion provided with. The improved soil is supplied from the flexible container to the storage container 33, and the cutter 43 is provided to cut off the lower end of the flexible container.
To ensure that the soil improvement material flows into the storage container 33 without overflowing or scattering from the flexible container cut by the cutter 43, the cutter supporting portion 43a is moved from the top plate 36 by a predetermined depth. It is provided in the position where it entered.

The soil improving material hopper 30 is provided with a bellows portion 37 which can be extended and contracted in the middle.
It is necessary to selectively fix the operating state of FIG. 8 in which the 7 is extended and the retracted state of FIG. Therefore, the mounting plate 36b is provided on the top plate 36 over three locations at approximately 120 ° intervals.
Are provided so as to extend laterally, and a support rod 45 is vertically provided on each of the mounting plates 36b. A guide cylinder 46 is provided on the base plate 32 at a position corresponding to the vertical position of each of the support rods 45.
5 are slidably inserted into the guide cylinders 46, respectively.
As a result, the guide cylinder 46 and the support rod 45 are fitted in a telescope shape, and the support rod 45 can penetrate the guide cylinder 46 and protrude downward. The support rod 45 has two pin insertion holes 45a at upper and lower positions.
A pin insertion hole (not shown) is formed at a predetermined position in the guide cylinder 46 at a predetermined position.
When the stopper pin 47 is inserted by aligning the pin insertion hole 45a below the support rod 45 with the pin insertion hole of the guide cylinder 46, the bellows 37 is fixed in an extended operating state,
When the stopper pin 47 is inserted by aligning the upper pin insertion hole 45b with the pin insertion hole of the guide cylinder 46, the bellows 3
7 is fixed in a stored state.

The feeder 34 connected to the storage container 33 is for supplying the soil improving material at a regulated supply amount. That is, as shown in FIGS. 14 to 16, the feeder 34 has a casing 48 fixed to the lower surface of the communication hole 39 in the storage container 33, and the casing 48 has an inflow port 49 a communicating with the communication hole 39 and a lower portion. Open supply port 4
9b. The wall surface of the intermediate portion is an arc-shaped fixed-quantity supply unit 49c. Inside the fixed-quantity supply unit 49c, a rotor 50 is provided so as to be fitted to the rotating shaft 51, and the rotor 50 is driven to rotate by the rotating shaft 51. You. Rotor 50
Are provided radially with a plurality of partition walls 50a substantially in sliding contact with the inner wall surface of the fixed quantity supply unit 49c.
Each time the is rotated by a predetermined angle, adjacent partition walls 50a, 50a
The soil improvement material corresponding to the space between them is separated. Therefore, by controlling the rotation speed of the rotor 50, the supply amount of the soil improvement material can be controlled.

In order to drive the feeder 34, a rotary shaft 51 is extended from a casing 48, and the rotary shaft 5
A pulley 51a is connected to one end of the motor 51, and a power transmission member 53 such as a transmission belt is interposed between the pulley 51a and the output shaft 52a of the motor 52.
The motor 52 can be constituted by, for example, a variable-speed electric motor.
It is possible to finely adjust the supply amount of the soil improvement material by the zero rotation. Therefore, the motor 52 constitutes a supply amount adjusting means. The motor 52 may be a hydraulic motor having a configuration in which the rotation speed is made variable by a flow control valve or the like.

Since the soil improving material hopper 30 is located at a high place, the open / close lid 41 provided on the top plate 36 is opened, and the open / close lid 4 is set in a state where the flexible container is suspended.
1 is inserted into the storage container 33 from above, and the lower end portion is cut off by the cutter 43 to supply the soil improvement material. For this purpose, the crane 5
4 are provided. As shown in FIG. 17, the crane 54 is provided with a turning portion 54a on the main body frame 2,
A support member 54b is erected on the turning portion 54a, and the base end of an arm 54c that expands and contracts in a telescopic manner is pivotally supported on the support member 54b, so that the cylinder 54d can be raised and lowered. A wire 56 connected to a hook 55 is connected to the tip of the arm 54c.
By rolling up and down 6,
The hook 55 moves up and down. The crane 54 is also used to expand and contract the bellows portion 37 of the soil improvement material hopper 30, and the hook locking device 42 provided on the top plate portion 36 can be engaged with the hook 55 of the crane 54. ing.

The end of the material conveying conveyor 10 is connected to a mixing vessel 60 as a mechanism for stirring and mixing earth and sand with the soil improving material in the mixing processing mechanism 4. The mixing container 60 is a rectangular container arranged in the longitudinal direction of the main body frame 2, that is, in a substantially horizontal direction. At front and rear positions, mounting portions 61 projecting left and right are respectively provided continuously. The portion 61 is fixedly installed on the upper surface of the main body frame 2 with bolts or the like. 18 to 21
2 shows an internal configuration of the mixing container 60 constituting the mixing processing mechanism section 4.

First, as is clear from FIGS. 18 and 19, an inlet 62 forming an inlet is provided at an upper part on the front side of the mixing vessel 60, and an outlet is provided at a lower part on the rear side. 63 are provided in connection with each other, and the other parts are sealed. As shown in FIGS. 20 and 21, two paddle mixers 64 are provided in parallel in the mixing container 60. The paddle mixer 64 has a rotating shaft 65, and a large number of paddles 66 are helically implanted on the rotating shaft 65 at a predetermined angle (for example, every 90 °), and rotate the rotating shaft 65. As a result, the paddle 66 is rotationally driven to stir the inside of the mixing vessel 60, and the earth and sand and the soil improving material guided into the mixing vessel 60 are stirred and uniformly mixed, and are directed toward the discharge port 63 side. Will be transported. Therefore, the paddle mixer 64 constitutes a rotary mixing means. Here, the transfer amount and the transfer speed by the paddle mixer 64 change according to the mounting angle of the paddle 66.

In this embodiment, two paddle mixers 64 are used.
The paddle 66 is provided at a position where the paddle 66 has a phase of 90 ° on the rotating shaft 65.
The number of pads 4 and the arrangement intervals of the paddles 66 are determined by the relationship between the height and width of the mixing container 60. When the height of the mixing vessel 60 is increased, a large paddle having a large turning radius can be attached. Therefore, the number of paddle mixers 64 may be reduced, but the height of the mixing vessel 60 is reduced and the width is increased. In this case, the rotation radius of the paddle is reduced, so that the number of paddle mixers is increased. Therefore, the size of the mixing container 60 and the number of the paddle mixers 64 may be set based on the relationship between the width of the main body frame 2 and the height of the entire vehicle in order to provide a predetermined stirring efficiency. However, mixing of earth and sand with soil improvement material in the mixing vessel 60
For smooth and efficient stirring and transfer, it is desirable that the number of paddle mixers 64 be an even number, and that adjacent paddle mixers 64, 64 rotate in mutually opposite directions. The paddle mixer 64 constitutes a rotary mixing means for mixing, agitating and transferring the earth and sand and the soil improving material in the mixing vessel 60. In addition to the rotary mixing means, for example, You may comprise with a screw mixer etc.

As shown in FIG. 20, both ends of the rotary shaft 65 of each paddle mixer 64 are rotatably supported by bearings 67, 67. The front end of the rotary shaft 65 is connected to the front end of the mixing vessel 60. , And extends into the housing of the driving section 68 provided in the first section. A transmission gear 6 is provided at the end of each rotating shaft 65.
9 are connected, and both transmission gears 69 are in mesh with each other. One of the transmission gears is connected to an output shaft of a hydraulic motor 70 for stirring and mixing. By driving the hydraulic motor 70 to rotate, the paddles 66 are respectively driven as shown by arrows in FIG. The two provided rotation shafts 65, 65 are simultaneously driven to rotate in mutually opposite directions. Here, the bottom of the mixing vessel 60 has a curved surface shape substantially coinciding with the rotation trajectory of the paddle 66, thereby preventing the earth and sand and the soil improving material from staying at the corners and the like at the lower end of the mixing vessel 60. I have. In FIG. 19, reference numeral 71 denotes an opening / closing door provided on a side surface of the mixing container 60, and reference numeral 72 denotes an inspection hole provided on an upper portion of the mixing container 60 and fitted with a lid.

In the mixing vessel 60 having the above structure, the earth and sand introduced from the inlet 62 and the soil improving material are uniformly stirred and mixed by the action of the paddle mixer 64.
Improved soil is produced while being transported toward the outlet 63. The improved soil thus produced is discharged from the discharge port 63 to the improved soil discharge section 5 by the action of its own weight. Here, the improved soil discharging section 5 has a carry-out conveyor 80.

The unloading conveyor 80 is for transporting the improved soil generated by the processing mechanism unit 4.
0 is provided with a conveyor scale 81 for measuring the weight of the improved soil, as shown in FIGS. Thus, the unloading conveyor 80 has the transport belt 82, which is driven by the motor 82, and is constituted by, for example, a hydraulic motor 83 (see FIG. 1) which feeds at a constant speed. A pair of fixed rollers 84, 84 disposed in front and rear in the transport direction of the transport belt are attached, and each of the fixed rollers 84 is in rolling contact with the lower surface of the transport belt 82. Front and rear fixed rollers 84, 84
The position between them is an improved soil volume measurement section, and the weight measurement is performed at a substantially intermediate position between the fixed rollers 84 before and after the fixed roller 84 constituting the improved soil volume measurement section so as to abut the back surface of the conveyor belt 82. A roller 85 is mounted. The weight measuring roller 85 is for detecting the degree of bending of the transport belt 82.

The weight measuring roller 85 is provided in connection with a swing plate 87 supported on a conveyor frame or the like so as to be swingable by a bearing member 86. A load sensor 88 such as a load cell constituting a weight measuring means is connected to the other end of the rocking plate 87 so as to be connected thereto. Therefore, the transport belt 8
When the improved soil deposited on the transport belt 82 is transported to the improved soil amount measurement section between the fixed rollers 84, 84 when the transported soil is transported in a state where a predetermined amount of the improved soil is deposited on
The transport belt 82 bends to sink. As a result, the weight measuring roller 85 is pushed in the direction of arrow D in FIG. 23, and the rocking plate 87 connected to the weight measuring roller 85 is moved in the direction indicated by arrow U in FIG.
Since the rocking displacement occurs in the direction, the load on the load sensor 88 increases, and the amount of the improved soil conveyed by the conveyor belt 82 can be measured based on the detection signal.

Next, FIG. 24 shows an example of a state in which soil improvement processing is being performed using a soil improvement machine. The figure shows that a soil improvement machine is arranged in a small-scale yard to improve the soil quality of the soil previously deposited in this yard. Is required. For example, a hydraulic excavator PS is suitably used as the means for charging earth and sand.

Therefore, in order to improve the soil quality in the yard,
Sediment deposited with a predetermined spread is picked up in order from the end by a bucket B of a hydraulic excavator PS, and put into a soil hopper 20 of a soil improvement machine. While the earth and sand is conveyed from the earth and sand hopper 20 by the material conveying conveyor 10, the earth and soil improving material is supplied from the earth and soil improving material hopper 30 and supplied onto the surface of the earth and sand. Then, a mixture of the earth and sand and the soil improving material is fed into the mixing container 60 from the end of the material transporting conveyor 10 through the inlet 62, and the mixture of the soil and the soil improving material is formed by the action of the paddle mixer 64 provided in the mixing container 60. Moves to the position of the outlet 63 while being stirred and mixed. Then, the improved soil in the aggregated state is generated by uniformly mixing the earth and sand and the soil improvement material in the mixing vessel 60. The improved soil is deposited at a predetermined position from a discharge port 63 via a discharge conveyor 80.

When earth and sand are taken into the soil improvement machine from the accumulation part, a space is created at that part. By accumulating the sequentially produced improved soil in this space, most of the space in the yard can be substantially used as both a sediment accumulation site and an improved soil accumulation site, and the yard space is effectively used. Can be used. It is for this reason that the soil improvement machine is allowed to run on its own by the undercarriage 1, and as the work progresses, the undercarriage 1 is actuated and the soil improvement machine is moved as the sedimentation site recedes. Let it do.

The improved soil thus generated is conveyed to the carry-out conveyor 80 constituting the improved soil discharging means and is deposited at a predetermined position. During this time, the amount of the improved soil generated is measured by the conveyor scale 81. And the unloading conveyor 80
An improved soil sorting device 90 is provided at the transfer end position. This sorting device 90 is configured as a portable type, and includes a sieve 91 and a transfer conveyor 92. The sieve 91 is, for example, 13 mm or less, 20 mm or less, 25 m
It is desirable to use a vibrating sieve having a mesh size that allows passage of a particle having a predetermined particle size such as m or less. After passing through the sieve 91, the improved soil having a uniform particle size is deposited on a predetermined deposition location by the transfer conveyor 92. In addition, since the improved soil having a large particle size that has not passed through the sieve 91 is of the same quality in that the solidification treatment has been performed, the improved soil having a large particle size is also subjected to the treatment for keeping the same or the same particle size. After that, it is used as a mixed material for backfilling.

The soil improvement process is performed as described above, provided that the rotation speed of the paddle mixer 64 installed in the mixing vessel 60 is set so that the sand and the soil improvement material can be uniformly stirred and mixed. , The highest rotational speed (hereinafter, referred to as a steady maximum rotational speed). As a result, the transfer speed of the mixed material and the improved soil obtained by uniformly mixing the mixed material in the mixing container 60 is increased, and the amount of the generated improved soil discharged from the outlet is determined. Then, the transport speed of the material transport conveyor is set so as to continuously supply the mixed material by an amount corresponding to the discharge amount of the improved soil. Thereby, the improved soil can be most efficiently produced by the soil improvement machine.

However, depending on the nature and condition of the supplied earth and sand, the stirring, mixing and transfer conditions are not constant. For example, when clayey earth and sand is supplied to the mixing vessel 60, it may adhere to the paddle 66 and the rotating shaft 65 and become stuck. And these paddles 6
6. When the amount of soil attached to the rotating shaft 65 increases, the resistance to rotation of the rotating shaft 65 increases, and as a result, the rotation speed of the hydraulic motor 70 for stirring and mixing falls below the steady maximum rotation speed state. I do. In this state, the mixing container 60
If the supply of the mixed material into the inside is continued, an excessive supply state occurs, the load on the hydraulic motor 70 increases, and the number of revolutions greatly decreases. If pebbles or large gravel are mixed in the supplied earth and sand, the paddle 66 and the mixing vessel 60
Between the paddles 66, 66 adjacent to each other, or between adjacent paddles 66, 66. In such a case, the load of the hydraulic motor 70 also increases, and the number of rotations of the hydraulic motor 70 decreases. Even if pebbles, gravel, and the like are caught and the rotational speed of the hydraulic motor 70 is reduced to some extent, the pebbles, gravel, and the like will eventually be destroyed as long as the paddle mixer 64 continues to rotate. However, if a certain amount of viscous earth and sand is contained in the mixing container 60, the load on the hydraulic motor 70 increases, and if bites such as pebbles or gravel occur in this state, the operation of the paddle mixer 64 stops. It will also be.

As described above, the paddle mixer 64 is discharged at the steady maximum rotational speed by the material transporting conveyor 10 despite the fact that the operating condition of the paddle mixer 64 is deteriorated due to the load fluctuation of the hydraulic motor 70. When the supply of the mixed material in an amount corresponding to the amount of the improved soil is continued, the mixing container 6
The amount of mixed material within zero increases. Generally, the amount of the mixed material in the mixing vessel is approximately 80% of the diameter of the paddle mixer 64, which is ideal from the viewpoint of stirring efficiency.
If the level exceeds this level, the earth and sand and the soil improvement material will not be uniformly mixed, and the quality of the improved soil will deteriorate. In addition, when the supply amount of the mixed material to the mixing container 60 further increases, the mixed material may eventually overflow from the inlet 62 of the mixing container 60.

As described above, when the load of the hydraulic motor 70 increases and the number of rotations of the hydraulic motor 70 decreases, the supply amount of the mixed material by the material transport conveyor 10 is reduced correspondingly, so that the inside of the mixing container 60 is reduced. Is set so that the supply amount of the mixed material does not become excessive.

As shown in FIG. 25, the agitating / mixing hydraulic motor 70 is driven by a pump 100. The agitating / mixing hydraulic motor 70 is driven and controlled by a control valve 101. Is made. Reference numeral 102 denotes a transfer hydraulic motor for driving the material transfer conveyor 10 on the mixed material supply unit 3 side. The transfer hydraulic motor 102 is driven by pressurized oil from a pump 103. A control valve 104 is provided, and the operation of the hydraulic motor 102 is controlled by the control valve 104.
Further, the pump 100 is a variable displacement pump, which detects the pressure on the discharge side and changes the discharge flow rate based on this discharge pressure. Reference numeral 105 denotes this discharge flow controller, that is, a pump regulator.

FIG. 26A shows the relationship between the discharge pressure P and the discharge flow rate Q in the pump 100. As is clear from this figure, the discharge flow rate controller 105 is controlled so that the discharge flow rate decreases as the discharge pressure of the pump 100 increases. If the discharge pressure is Pa or less, the discharge flow rate becomes the maximum Qa. This is the steady maximum rotational speed state. That is, the flow rate Qa is set to
, The rotational speed of the hydraulic motor 70 becomes the set steady maximum rotational speed. When the load on the hydraulic motor 70 increases, the discharge pressure of the pump 100 increases, and when the pressure exceeds Pa, the discharge flow rate decreases. For example, when the discharge pressure becomes Pi, the discharge flow rate decreases to Qi. Further, when the discharge pressure becomes Pb, the flow rate becomes Qb, and the rotation of the hydraulic motor 70 substantially stops. Therefore, pump 1
In the range Pa-Pb where the discharge pressure from 00 is Pa to Pb, the discharge flow rate changes in the range Qa-Qb, and thus the rotational speed of the hydraulic motor 70 changes.

Therefore, as shown in FIG. 26 (b), when the discharge pressure of the pump 100 changes in the range Pa-Pb, the supply flow rate to the transfer hydraulic motor 102 is set to change. Here, the pump 103 is constituted by a fixed displacement pump, and the change of the supply flow rate is controlled by the control valve 1.
04 is performed. If the discharge pressure from the pump 100 is Pa or less, the supply flow rate from the pump 103 to the transport hydraulic motor 102 is set to QA. When the discharge pressure is in the range from Pa to Pb, the flow rate supplied to the transport hydraulic motor 102 is reduced in the range from QA to 0 accordingly. For example, when the discharge pressure of the pump 100 is Pi, the discharge flow rate of the pump 103 is set to QI. Further, when the discharge pressure of the pump 100 becomes Pb, the discharge flow rate from the pump 103 is set to substantially zero. As a result, when the rotational speed of the stirring / mixing hydraulic motor 70 changes, the rotational speed of the transport hydraulic motor 102 changes following the change, and the transport speed of the material transport conveyor 10 changes accordingly. Will be.

As shown in the flowchart of FIG.
Pump 1 for supplying pressurized oil to hydraulic motor 70 for stirring and mixing
When the discharge pressure of 00, that is, the drive pressure of the hydraulic motor 70 is Pa or less, the state of the discharge flow rate Qa is maintained, and the rotation speed of the hydraulic motor 70 is kept constant. At this time, the flow rate supplied to the transport hydraulic motor 102 by the pump 103 becomes QA, and the rotational speed of the hydraulic motor 102 is also kept at the steady maximum rotational speed. Therefore, the material transport conveyor 10 operates at the maximum speed Smax. That is,
As long as the appropriate load is not exceeded, the paddle mixer 64 is driven at the steady maximum rotational speed to generate and discharge a predetermined amount of the improved soil, and the material transport conveyor 10 mixes the amount of the improved soil corresponding to the discharged amount of the improved soil. Material is supplied.

When the load on the paddle mixer 64 increases and the discharge pressure of the pump 100 increases from Pa and falls within the range from Pa to Pb, the stirring / mixing hydraulic motor 102
Rotation speed decreases. As a result, the amount of improved soil discharged by the paddle mixer 64 is reduced. As the discharge pressure of the pump 100 increases, the supply flow rate to the transport hydraulic motor 102 is changed to be ΔQ. As a result, the speed of the material conveying conveyor 10 changes in the range of ΔS, and the mixing vessel 6
An amount of the mixed material corresponding to the improved soil discharged from 0 is supplied to the mixing container 60. Therefore, the most efficient soil improvement process of the mixing vessel 60 at present is performed, and the load on the paddle mixer 64 does not increase any more. In other words, even when performing soil improvement processing of highly viscous soil with poor processing conditions, the maximum processing capacity is exhibited. Further, when the load of the paddle mixer 64 is temporarily increased due to the entrapment of pebbles, gravel, or the like, the processing conditions are reduced only during that time. When supplied, the load on the paddle mixer 64 is prevented from further increasing, and when the bite is eliminated, the state immediately returns to the state in which the soil improvement processing can be performed most efficiently.

When the load of the paddle mixer 64 further increases and the discharge pressure of the pump 100 exceeds Pb, the discharge flow rate becomes Qb. Usually, a relief valve is provided on the discharge side of the pump 100. When the discharge pressure reaches Pb, the relief valve opens, and the pressure oil corresponding to the flow rate Qb returns to the tank. As a result, the hydraulic motor 70 stops,
The rotation of the paddle mixer 64 stops. At this time, following this, the supply flow rate to the transport hydraulic motor 102 becomes zero.
And the material transport conveyor 10 stops, and the mixing container 6
At 0, no mixed material is supplied. In this state, it is desirable that an appropriate alarm be issued to notify the operator or the like that the processing mechanism unit 4 has stopped operating.

As described above, in order to change the supply flow rate to the transport hydraulic motor 102 in accordance with the change in the discharge pressure of the pump 100, the pump 100 is controlled by the pressure guide path 106 shown in FIG. The pressure on the discharge side is guided to the control valve 104 of the hydraulic motor 102 for conveyance, and the switching of the control valve 104 is controlled by this pressure.
Change the flow path area on the high pressure side. Accordingly, the discharge flow rate controller 105 is a detecting means for detecting the operation state of the paddle mixer 64 as the stirring / mixing means, and the pressure guide path 106 changes the supply amount of the mixed material by the material conveying conveyor 10 based on the detecting means. It functions as control means for causing the control to be performed.

In the hydraulic circuit shown in FIG.
Although the discharge pressure of 0 is directly introduced to the control valve 104, as shown in FIG. 28, the discharge pressure of the pump 100 is introduced to the proportional control valve 107, and the pilot pressure of the control valve 104 is controlled by the proportional control valve 107. It is also possible to control the supply pressure of the pilot pump 108 to be supplied. With this configuration,
The hydraulic circuit including the agitating / mixing hydraulic motor 70 and the hydraulic circuit including the transport hydraulic motor 102 are independently configured, and the proportional control valve 107 controls the transport hydraulic motor 10.
2 can be adjusted.

Further, as shown in FIG. 29, when a rotational speed detector 109 for detecting the rotational speed of the hydraulic motor 70 for stirring / mixing is provided, the rotational speed detector 1
The rotation speed of 09 is taken into the controller 110, and the supply amount of the pressure oil to the transport hydraulic motor 102 can be changed based on a signal from the controller 110. In this case, if the control valve of the transfer hydraulic motor 102 is of a hydraulic pilot type, the electric signal from the controller 110 may be converted into a hydraulic signal. Also, as shown in FIG.
If it is 4 ', the control valve 104' can be directly controlled based on the electric signal from the controller 110. In FIG. 29, the pump 100 ′ for supplying pressure oil to the agitating / mixing hydraulic motor 70 is constituted by a fixed displacement pump, and the control valve 101 ′ is also of an electromagnetic pilot type. The switching control of the control valve 101 'is performed based on this. Further, it is also possible to detect the discharge state of the improved soil by detecting the discharge pressure of the pump 100 with a sensor, take this detection signal into the controller 110, and change the control signal from the controller 110 to the control valve 104.

As described above, FIG. 25 and FIGS.
According to the configuration illustrated in any one of the above, when the rotation speed of the stirring / mixing hydraulic motor 70 changes due to the fluctuation of the load,
Following this, the transport speed of the material transport conveyor 10 by the transport hydraulic motor 102 changes. As a result, the supply amount of the mixed material into the mixing container 60 does not become excessive. In addition, even if the processing conditions in the mixing vessel 60 are deteriorated due to the nature and condition of the soil for which the soil improving processing is performed, even if the supply amount of the mixed material to the mixing vessel 60 is reduced, the soil improving processing is performed. The process itself does not stop, and processing can be continuously performed. Therefore, efficient soil improvement processing can be performed even on soil that is disadvantageous to the processing conditions, and inconveniences such as the overflow of the mixed material from the inlet 62 of the mixing container 60 during the continuation of the processing occur. There is no.

By the way, when the conveying speed of the material conveying conveyor 10 is changed, unless the feed rate of the soil improving material supplied by the feeder 34 is adjusted accordingly, the mixing ratio of the soil and the soil improving material changes. I will. Therefore, it is desirable that the supply amount of the soil improving material supplied from the feeder 34 be automatically adjusted according to the transport speed of the earth and sand by the material transport conveyor 10.

Therefore, it is possible to detect a change in the speed of the material conveying conveyor 10 and control the motor 52 for rotating the rotor 50 of the feeder 34 in accordance with the detected speed. That is, as shown in FIG. 25, in order to detect the number of rotations of the transport hydraulic motor 102, the rotation detector 11
1, a detection signal from the rotation speed detector 111 is taken into the control unit 112, and a motor 52 for driving the feeder 34 based on the signal from the control unit 112 is provided.
Can be controlled.

The material conveyor 10 is controlled when the discharged amount of the improved soil from the mixing vessel 60 decreases. The discharged amount of the improved soil is measured by the conveyor scale 81. I have. Therefore, it is also possible to adopt a configuration in which the number of revolutions of the motor 52 is changed in accordance with a change in the weight of the improved soil carried out by the carry-out conveyor 80 by the conveyor scale 81.

With the above configuration, the speed of the material transport conveyor 10 for transporting the earth and sand as the mixed material is reduced due to the change in the amount of the improved soil discharged from the mixing vessel 60, When the supply amount of the earth and sand to the mixing container 60 decreases, the supply amount of the soil improving material decreases accordingly. Therefore, even if the mixed material is reduced as a whole, the mixing ratio between the earth and sand and the soil improvement material does not change.

[0057]

According to the present invention, the agitation and stirring are carried out in accordance with the properties and condition of the soil to be subjected to the soil improvement treatment.
Even if the operating condition of the mixing means changes, the situation that the mixed material is not excessively supplied to the processing mechanism does not occur, and the soil improvement processing can be performed smoothly and efficiently. To play.

[Brief description of the drawings]

FIG. 1 is a plan view of a self-propelled soil improvement machine showing one embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is an exploded view showing a structure of each mechanism for performing a soil improvement process in FIG. 2 in an exploded manner.

FIG. 4 is a cross-sectional view of the earth and sand hopper according to the embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a plan view of a sieve unit according to the embodiment of the present invention.

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a front view of a soil improvement material hopper according to the embodiment of the present invention.

FIG. 9 is a plan view of FIG.

FIG. 10 is a front view similar to FIG. 8, showing the storage tank of the soil improvement material hopper in a stored state.

11 is a cross-sectional view of a base part forming a storage tank in the soil improvement material hopper of FIG.

FIG. 12 is a plan view similar to FIG. 9 with the opening / closing lid removed.

FIG. 13 is a cross-sectional view taken along the line BB of FIG. 9, with the base portion omitted.

FIG. 14 is a plan view of a feeder according to the embodiment of the present invention.

FIG. 15 is a sectional view taken along the line CC of FIG. 14;

FIG. 16 is a sectional view taken along line DD of FIG.

FIG. 17 is a front view showing a configuration of a crane installed in the self-propelled soil improvement machine according to one embodiment of the present invention.

FIG. 18 is a plan view of a mixing container according to one embodiment of the present invention.

FIG. 19 is a front view of FIG. 18;

20 is a sectional view taken along the line EE of FIG. 18;

FIG. 21 is a sectional view taken along line FF of FIG. 18;

FIG. 22 is a configuration explanatory view of a conveyor scale attached to an improved soil discharging unit according to an embodiment of the present invention.

FIG. 23 is an operation explanatory view of the conveyor scale shown in FIG. 22;

FIG. 24 is an operation explanatory view showing a state in which soil improvement is performed in the yard by the self-propelled soil improvement machine according to the embodiment of the present invention.

FIG. 25 is a hydraulic circuit diagram showing an example of an interlocking relationship between a stirring / mixing hydraulic motor and a transport hydraulic motor used as an embodiment of the present invention.

26 is a diagram showing the relationship between the supply pressure to the stirring / mixing hydraulic motor of FIG. 25 and the supply flow rate to the transport hydraulic motor.

FIG. 27 is a flowchart showing an operation procedure in the hydraulic circuit of FIG. 25.

FIG. 28 is a hydraulic circuit diagram showing an interlocking relationship between a stirring / mixing hydraulic motor and a transport hydraulic motor in a mode different from that of FIG. 25.

FIG. 29 is a hydraulic circuit diagram showing the interlocking relationship between the stirring / mixing hydraulic motor and the transport hydraulic motor in still another embodiment different from FIG. 25.

[Explanation of symbols]

2 Body frame 3 Mixed material supply section 4 Processing mechanism section 5 Improved soil discharge section 10 Material transport conveyor 11 Transport belt 20 Earth and sand hopper 33 Storage container 34 Feeder 50 Rotor 52 Motor 60 Mixing container 62 Inlet 63 Outlet 64 Paddle mixer 65 Rotating shaft Reference Signs List 70 hydraulic motor 80 carry-out conveyor 81 conveyor scale 83 hydraulic motor 100, 100 ', 103 pump 101, 101', 104, 104 'control valve 102 transfer hydraulic motor 105 discharge flow controller 106 guiding pressure path 107 proportional control valve 109, 111 Rotation speed detector 110 Controller 112 Control unit

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hisagi Hashimoto 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. (72) Inventor Kazuma Sawa 2-6-2 Otemachi, Chiyoda-ku, Tokyo F-term (reference) 2D040 AB07 AC05 CD07 EB04

Claims (6)

[Claims] 1. A mixed material transporting conveyor for transporting a mixed material comprising earth and sand supplied from a soil and sand supplying means and a soil improving material supplied from a soil improving material supplying means, and a mixing material supplied from the mixed material transporting conveyor. A processing mechanism for generating an improved soil in which the materials are mixed, and the processing mechanism includes:
A stirring and mixing means for transferring the mixed material flowing from the introduction section while stirring and mixing, and discharging the generated improved soil from the discharge section, and a stirring and mixing type soil improvement machine equipped with a driving means therefor; Detecting means for detecting the state of discharge of the improved soil in the mechanism section; and control means for changing the feed speed of the mixed material transport conveyor in accordance with a change in the state of discharge of the improved soil by the detection means. A stirring / mixing type soil improvement machine characterized by the following. 2. The soil improvement material supply means includes a soil improvement material supply amount adjusting means, and adjusts a supply amount of the soil improvement material by the supply amount adjustment means according to a feed speed of the mixed material transporting conveyor. The stirring / mixing type soil improvement machine according to claim 1, wherein the soil improvement machine has a configuration. 3. The processing mechanism unit includes a mixing container, a rotary mixing unit mounted in the mixing container, and agitating and mixing while transferring the mixed material in a predetermined direction, and a rotary mixing unit. 3. A driving motor, wherein the detecting means detects at least one of a rotation speed of the rotary mixing means and a load of the motor. The agitation / mixing type soil improvement machine according to the above. 4. The stirring and mixing device according to claim 3, wherein said motor is constituted by a stirring and mixing hydraulic motor, and said detecting means detects a discharge pressure of said hydraulic motor.
Mixed soil improvement machine. 5. The mixed material conveying conveyor is driven by a conveying hydraulic motor, and the control means supplies the mixed material conveying motor to the conveying hydraulic motor when the discharge pressure of the stirring / mixing hydraulic motor increases. The stirring / mixing type soil improvement machine according to claim 4, wherein the flow rate is adjusted to be small. 6. The soil improving material supply means includes a feeder having a rotor, and the rotor is driven by a motor, and the supply amount adjusting means changes the number of revolutions of the motor. The stirring / mixing type soil improvement machine according to claim 2, wherein