JP2001248150A - Soil improving machine with excavating means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate high-quality improved soil by accurately measuring the quantity of the sediment transferred in a mixing container, and controlling the mixing ratio of the sediment and a soil improving material very accurately. SOLUTION: A revolving speed detector 80 is provided on a stirring hydraulic motor 28 driving a paddle mixer 21, the height of the sediment transferred in the mixing container 20 is measured by ultrasonic sensors 81 provided at three positions between a sediment insertion hopper 40 and a feeder 69, and their signals are transmitted to a controller 82 to measure the transfer quantity of the sediment in the mixing container 20. A mixing ratio setting means 83 is connected to the controller 82 to set the mixing ratio of the sediment and the soil improving material. The revolving speed of the rotary shaft 70 of the feeder 69 by the electric motor 76 of a soil improving material feeding means 5 is controlled based on the transfer quantity of the sediment calculated by the controller 82 and its mixing ratio, and the feed quantity of the soil improving material to the mixing container 20 is adjusted in accordance with the transfer quantity of sediment to keep the mixing ratio constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil improving machine for mixing earth and sand with a soil improving material, and more particularly to a machine for excavating the earth and sand excavated by the excavating means. The present invention relates to a soil improvement machine having an excavation means capable of keeping a mixing ratio of a soil and a soil improvement material constant.

[0002]

2. Description of the Related Art As a soil improvement machine having a digging means, for example, a machine described in Japanese Patent Application Laid-Open No. 11-2222847 is known. As a configuration of the soil improvement machine according to the prior art, a work vehicle having a configuration substantially similar to a hydraulic shovel is provided with a soil improvement mechanism for mixing earth and sand and a soil improvement material. In the soil improvement mechanism, a mixing container having a built-in stirring / mixing means configured as a continuous mixing means such as a screw conveyor and a paddle mixer is installed on the lower traveling body, and the soil and sand input hopper and the supply of the soil improvement material are supplied to the mixing container. It is configured to connect means.

[0003] Since this soil improvement machine has substantially the same mechanism as a hydraulic shovel, that is, excavating means comprising a front working machine having a bucket, the excavating means supplies earth and sand into the mixing vessel. . Therefore, the excavated soil is directly injected by providing the earth and sand input hopper within the operation range of the bucket. Although a mechanism for previously removing solid foreign matter such as a sieve is provided in the earth and sand input hopper, the earth and sand injected into the earth and sand input hopper basically flows into the mixing container by its own weight. On the other hand, as a configuration of the soil improvement material supply means, a storage section such as a tank for storing the soil improvement material is installed on the upper revolving structure side, and a feeder is connected to the storage section, and the soil improvement material is supplied from the feeder. Is continuously or intermittently supplied into the mixing vessel. The stirring / mixing means provided in the mixing container is constituted by a screw conveyor or the like, and the screw conveyor stirs and mixes the earth and sand and the soil improving material, and the earth and sand and the soil improving material supplied in the mixing container in a predetermined direction. It also has the function of transferring to When the soil is transferred to the vicinity of the outlet in the mixing vessel, an improved soil in which the earth and sand and the soil improvement material are uniformly mixed is obtained, and the improved soil is transferred from the outlet to the discharge means.
Therefore, as long as the soil improvement material is stored in the soil improvement material supply means and the supply of the earth and sand by the excavation means into the earth and sand input hopper is continued, the improved soil is continuously generated in the mixing vessel, The resulting improved soil is continuously discharged.

[0004]

SUMMARY OF THE INVENTION In order to improve the quality of the improved soil produced by the soil improvement machine, the mixing ratio of the soil and the soil improving material is set to a predetermined mixing ratio. It is necessary that the materials are uniformly mixed. The above-described conventional soil improvement machine has a configuration in which four screw conveyors are provided in a mixing vessel, and the rotation shaft of the screw conveyor is driven to rotate by a hydraulic motor. By accurately controlling the number of rotations of the rotary shaft by the hydraulic motor, the earth and sand and the soil improving material can be mixed very uniformly.

[0005] Since the soil improving material is supplied to the mixing vessel by the feeder, the feed amount of the soil improving material can be controlled by controlling the feeder. Since the earth and sand is supplied by using the excavation means, it becomes an intermittent supply mode. Moreover, since the screw conveyor rotates continuously, the transfer of the earth and sand in the mixing vessel is a continuous transfer.
By making the earth and sand input hopper have a predetermined volume,
A buffer function is provided between the intermittent charging and continuous transfer of the earth and sand so that the supply of the earth and sand is not interrupted or the supply amount fluctuates. Therefore, in order to control the mixing ratio between the earth and sand and the soil improvement material, it is necessary to measure the amount of earth and sand continuously transferred from the earth and sand input hopper in the mixing vessel.

[0006] In order to accurately perform stirring and mixing by a screw conveyor in a mixing container and to perform an efficient soil improvement process, the height level of the sand in the mixing container is roughly determined by the rotation locus of the screw conveyor. It is optimal to limit it to about 80%. To adjust the amount of sediment transport,
It is desirable to install a gate plate on the downstream side of the earth and sand input hopper and on the upstream side of the soil improving material supply means, and to regulate the transfer amount of the earth and sand by the gate plate. Since the gate plate exhibits a function of transferring the earth and sand by a fixed amount, if the rotation speed of the screw conveyor is kept constant, the mixing ratio between the earth and sand and the soil improving material can be made constant to some extent.

[0007] However, the amount of earth and sand passing through the gate plate varies depending on the amount of earth and sand in the earth and sand input hopper. In other words, since the gate plate allows the earth and sand to pass through in such a way as to scrape off, of the earth and sand moving toward this gate plate, the excess earth and sand that does not pass through the lower part of the gate plate is blocked by the gate plate in the opposite direction. The movement of the earth and sand in the earth and sand input hopper becomes complicated, for example, there is an object which tends to flow and stays around the gate plate. Therefore, the earth and sand may not always be sent out by a predetermined amount which is always worn off by the gate plate. In particular, when the amount of sediment stored in the sediment input hopper is small, the height level may fluctuate periodically when passing through the gate plate, and the sediment is further stored up to the height of the gate plate. If not, less sediment will be transferred. For this,
Depending on the gate plate provided in the mixing vessel, the amount of sediment transported to some extent can be controlled to some extent, but it cannot be denied that the amount of sediment transported still fluctuates.

That is, depending on the gate plate, it is not possible to accurately control the mixing ratio between the earth and sand and the soil improvement material. Therefore, it is estimated that the supply amount of the earth and sand into the mixing container is at a height position where it is worn by the gate plate, and if the soil improvement material is supplied at a mixing ratio corresponding thereto, at least the content of the soil improvement material is reduced. It will not fall below the set value. As a result, for example, in the case of solidifying the earth and sand, such as ground reinforcement, for the purpose of soil improvement, the purpose is not necessarily not achieved. However, not only is the soil improvement material wasted wastefully,
When used as backfill soil or the like in a pipe burial place or the like, there is also a problem that the backfill portion is excessively solidified and it becomes difficult to perform re-digging.

The present invention has been made in view of the above points, and an object of the present invention is to accurately measure the amount of sediment transported in a mixing vessel, and to obtain soil and soil improvement material. The purpose of the present invention is to make it possible to very accurately control the mixing ratio of the soil and thereby to produce a high quality improved soil.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a working vehicle equipped with excavating means, a mixing vessel having a stirring / mixing means mounted therein, and a method of applying earth and sand to the mixing vessel. A soil-improvement machine, comprising: a soil-implantation hopper into which earth and sand is introduced by the excavation means for supplying the soil-improvement material; and a soil-improvement-material supply means for supplying a soil-improvement material to the mixing vessel. Means for changing the supply amount of the soil improving material to the mixing vessel, and a soil improving material supply amount changing means for changing the supply amount of the soil improving material to the mixing vessel; Earth and sand transfer amount measuring means for measuring the amount of earth and sand transferred in the container,
Control means for taking in the signal from the earth and sand transfer amount measuring means and changing the supply amount of the soil improvement material by the soil improvement material supply amount changing means to make the mixing ratio of the soil and soil improvement material constant. It is characterized by having a configuration provided with.

Here, the means for supplying soil improving material may be configured to include a storage section for soil improving material, and a feeder for supplying the soil improving material from the storage section to the mixing vessel. In this case, the soil improvement material supply amount changing means is provided in the feeder, and includes a rotor that supplies the soil improvement material to the mixing container by a fixed amount by rotation, and a motor that rotates the rotor. Then, the configuration is such that the rotation speed of the rotor is controlled based on a signal from the control means. Further, the earth and sand transfer amount measuring means may be arranged at an upper position of the mixing vessel, and may be constituted by distance measuring means for measuring the height dimension of the earth and sand, and means for measuring the earth and sand transport speed by the stirring / transporting means. it can. As the distance measuring means, various types of distance measuring means including a contact type and a non-contact type can be used. It is most preferable to use an ultrasonic sensor from the viewpoint of. In order to accurately measure the amount of sediment, at least three or more distance measuring means are provided in the width direction of the mixing vessel. Each distance measuring means is installed at a position between a plurality of stirring / mixing means. As a result, it is possible to suppress the occurrence of a measurement error due to a change in the height level of the earth and sand. If the mixing vessel is provided with a gate for adjusting the amount of sediment supplied at a position between the sediment charging hopper and the soil improvement material supplying means, the distance measuring means is disposed at a position downstream of the gate. It is desirable to do.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Here, the excavation mechanism provided in the soil improvement machine of the present invention has the same configuration as the excavation mechanism in the hydraulic excavator. Therefore, the basic configuration of the soil improvement machine is a conventionally known hydraulic excavator. The soil improvement mechanism is mounted without impairing the function as a hydraulic excavator and without making any special modifications to the configuration as a hydraulic shovel. However, it is not necessarily limited to a configuration in which the soil improvement mechanism is mounted on the hydraulic excavator.

FIGS. 1 to 3 show the overall construction of the soil improvement machine of the present invention. As is apparent from these figures, a work vehicle is constituted by the lower traveling body 1 and the upper revolving superstructure 2, and a front work machine 3 is provided on the upper revolving superstructure 2 as an excavation mechanism in the work vehicle. A soil improvement mechanism 4 is provided on the lower traveling body 1 side, and a soil improvement material supply means 5 is provided on the upper revolving body 2 side. further,
An operator cab 6 and a machine room 7 are installed in the upper revolving unit 2, and the machine room 7 accommodates equipment for driving the machine, such as an engine and a hydraulic pump, and the operator cab is mounted in the operator cab 6. Thus, the operation of the entire machine is performed. The upper revolving unit 2 can be turned with respect to the lower traveling unit 1 by a turning device 8.

The lower traveling body 1 has crawler-type traveling bodies 10 provided on the left and right sides. These traveling bodies 10 are composed of sprockets 12 and idlers 13 provided at both ends of a track frame 11, and these sprockets 12 and idlers 13 The sprocket 12 is driven by a hydraulic motor. The left and right track frames 11 are connected by a center frame 15, and the turning device 8 is attached to the center frame 15. Here, the center frame 15 is connected to the turning device 8.
The track frame 11 is connected to both ends of the horizontal portion where the horizontal frame is installed, so that a wide space is secured below the center frame 15.

The front work machine 3 constitutes an excavating means, and is connected to a boom 16 provided on the frame 2a of the upper swing body 2 so as to be capable of raising and lowering, and to a tip of the boom 16 so as to be rotatable vertically. Arm 17 and this arm 17
The boom 16, the arm 17, and the bucket 18 are each driven by a hydraulic cylinder to perform operations such as excavation of earth and sand.

The soil improvement mechanism 4 has the structure shown in FIGS. As is clear from FIGS. 4 and 5, the soil improvement machine 4 has a mixing vessel 20, which is a shallow vessel whose length is longer in the length direction than in the width direction. , The upper surface and the rear end are open. In the mixing container 20, four paddle mixers 21 are provided in parallel as stirring and mixing means for stirring and mixing while being transferred from the front side to the rear side. The paddle mixer 21 has a rotary shaft 22, and a paddle 23 as a stirring / transfer blade is provided around the rotary shaft 22.
Are attached so as to be spirally arranged. The blades for stirring / transfer may be formed as a continuous screw or the like on the rotating shaft 22. Therefore, when the rotating shaft 22 to which the paddle 23 is attached is rotated, the inside of the mixing container 20 is stirred.

Since the mixing container 20 is installed on the lower traveling body 1, even if a wide space is formed below the center frame 15, the crawler belt 1 is still used.
The height from the ground plane of 4 is significantly restricted. Moreover, in order to prevent the bottom surface of the mixing container 20 from hitting a projection or the like from the ground while the vehicle is running, this bottom surface position must be separated from the ground surface of the crawler belt 14 to some extent. On the other hand, the width dimension of the mixing container 20 is regulated by the distance between the left and right crawler belts 14, 14, but can be considerably wider than the height dimension. Therefore,
The width of the mixing container 20 in the width direction is approximately four times as large as that in the height direction, and four paddle mixers 21 are extended in the mixing container 20 at equal intervals in a direction parallel to the crawler belt 14. Therefore, this mixing container 20
The transport direction of the earth and sand, the soil improving material by the paddle mixer 21 and the improved soil in a state where the soil and the soil improving material are mixed in the paddle mixer 21 is backward with respect to the traveling direction of the lower traveling body 1. And the earth and sand and the soil improvement material are more uniformly stirred and
In order to mix, the total length of the mixing container 20 is made as long as possible.

As is clear from FIG. 6, the mixing vessel 20
A drive unit 24 is provided at one end of the drive unit. The rotation shaft 22 of the paddle mixer 21 is
It is rotatably supported by a bearing 25 provided at the transition from 0 to the drive unit 24, and its end extends into the drive unit 24. The end of each rotation shaft 22 extends into the housing of the drive unit 24 provided at the front end of the mixing container 20. A transmission gear 26 is connected to the tip of each rotating shaft 22, and transmission gears 26, 26 at adjacent positions are provided.
Are engaged with each other, and when one rotation shaft (shown as the rotation shaft 22a in FIG. 6) is rotated, the other three rotation shafts are rotated.
The rotating shafts are also driven to rotate. However, as shown in FIG. 7, adjacent rotation axes rotate in mutually opposite directions.
For this purpose, a pulley 27 is mounted on the rotating shaft 22a,
A hydraulic motor 2 for stirring is provided in the housing of the drive unit 24.
A pulley 29 is connected to the output shaft of the hydraulic motor 28 for stirring, and a transmission member 30 such as a chain or a belt is wound between the pulleys 27 and 29. Is provided. As a result, the entire inside of the mixing vessel 20 having a predetermined width and length can be thoroughly stirred by the single stirring hydraulic motor 28.

From the above, one end of the rotary shaft 22 of the paddle mixer 21 is the drive side extending into the drive section 24, and the other end is the transfer end side. Each rotating shaft 22
The drive side of the bearing 25 provided in a portion connected to the drive unit 24,
That is, it is rotatably supported by the drive unit side bearing 25. However, if the rotating shaft 22 is supported in a cantilevered state by only the drive unit side bearing 25 and the other end side is in a free state, the stability is lost. In particular, when the length of the mixing vessel 20 is increased and the transfer distance is increased in order to mix and agitate the earth and sand and the soil improving material as uniformly as possible, the other end of the rotating shaft 22 is used during the agitation and mixing. When a large bending load acts on the rotation axis due to resistance or the like, the smoothness of rotation is impaired. Therefore, a bearing 31 for rotatably supporting the other end of each rotating shaft 22 is provided.
As a result, both ends of the rotary shaft 22 are substantially
5, 31 are rotatably supported.

The mixing vessel 20 is provided with a sediment input section on the front side in the longitudinal direction, and a sediment input hopper 40 as a sediment input section for storing a predetermined volume of sediment is mounted on the input section. A sieve 41 is provided at a site of the inlet in the earth and sand input hopper 40, and the sieve 41 prevents lumps such as rocks and concrete, metals and the like from entering. Moreover, the sieve 41 constituting the earth and sand input portion is inclined obliquely downward toward the front, so that the lump or the like remaining on the sieve 41 can easily fall along this inclination. Further, as shown in FIG. 8, a forced feeding means 42 for forcingly feeding the earth and sand is provided inside the earth and sand input hopper 40. The forcible feeding means 42 has a large number of scraping claws 44 attached to a rotating shaft 43. When the rotating shaft 43 is driven to rotate by a hydraulic motor, the earth and sand put into the earth and sand input hopper 40 is forcibly forced into the mixing vessel 20. Sent to Therefore, even if the soil to be treated contains water and becomes clay-like,
It is taken in smoothly without causing a bridging phenomenon on the sieve 41.

Further, a discharging means 50 for the improved soil is connected to the rear end of the mixing vessel 20. Therefore, mixing container 2
In 0, the position where the earth and sand input hopper 40 is provided is the most upstream side, and the end connected to the discharging means 50 is the most downstream side, and serves as an outlet for the improved soil. Therefore, the configuration of the discharging means 50 will be described with reference to FIGS.

The discharging means 50 has a structure in which a screw 52 for transferring the improved soil is provided in a cylindrical main body 51, and the screw 52 is driven to rotate by a hydraulic motor 53. The main body 51 extends in a direction orthogonal to the traveling direction of the vehicle, and has an inflow opening 51a formed in a peripheral body thereof. The mixing container 20 is connected so that the rear end thereof faces the inflow opening 51a.
The screw 52 is formed by fixing a continuous blade 52b to a rotating shaft 52a rotated and driven by a hydraulic motor 53. The improved soil guided from the mixing container 20 into the main body 51 of the discharging means 50 is: By the rotation of the screw 52, the screw 52 is conveyed in a direction orthogonal to the traveling direction of the vehicle, discharged from the discharge port 51b, and deposited at a desired location. The opening position of the discharge port 51b is located outside the crawler belt 14 constituting the lower traveling body 1, so that even when the vehicle is running, the improved soil accumulated on the crawler belt 14 is not stepped on. I have.

Next, the soil improving material supply means 5 for supplying the soil improving material mixed with the earth and sand is disposed downstream of the earth and sand input hopper 61 at a position close to the earth and sand input hopper 61. Therefore, a specific configuration of the soil improvement material supply means 5 will be described with reference to FIGS.

As is apparent from these figures, the soil improvement material supply means 5 includes a soil improvement material storage section 60 installed on the frame of the upper swing body 2 and a soil improvement material hopper 61 provided on the lower traveling body 1 side. It is composed of As shown in FIG. 11, a flexible container 62 made of a bag filled with a soil improving material is placed in the soil improving material storage section 60. The soil improving material is supplied to the mixing container 20 via the material hopper 61.

First, the soil improvement material storage section 60 is provided with a container holding frame 63 erected on the frame of the upper swing body 2.
And a supply unit 64 disposed below the frame 63 and functioning as a temporary storage unit. The flexible container 62 has a lower end in the frame 63 and a supply unit 6.
4 is installed so as to enter. When the flexible container 62 is installed in the soil-improving material storage section 60, the soil-improving material is supplied when the flexible container 62 is installed in the soil-improving material storage section 60 because the soil-improving material is housed in a sealed state. Must be opened in order to For this purpose, as shown in FIG.
Is installed. Therefore, when the flexible container 62 is mounted on the frame 63 constituting the soil improvement material storage section 60, the lower end of the flexible container 62 enters the supply section 64 by its own weight, and the cutter 65 Since the flexible container 62 is pierced into the lower end portion of the flexible container 62, the soil improving material flows into the supply portion 64. In addition, the soil improvement material storage part can also be made into the shape of a tank.

The supply section 64 has a substantially inverted quadrangular pyramid shape, and its tip projects forward in the traveling direction of the upper swing body 2 and further toward the center of the upper swing body 2. The supply port 6 at the lower end of the supply section 64
A shutter 66 is provided at the portion 4a, and the shutter 66 is driven to open and close by a hydraulic cylinder 66a. As is clear from FIG. 13, the soil improving material hopper 61 is provided so as to be connected to the mixing container 20 installed on the lower traveling body 1 side, and is arranged at a position where the supply port 64 a of the supply unit 64 is opened. For this purpose, a plurality of columns 67 are erected on the side wall of the mixing vessel 20, and the soil improving material hopper 61 is detachably attached to these columns 67 and fixed with bolts or the like. Soil improvement material hopper 61
The upper end of the shutter 66 is open.
Are provided at the lower end of the supply section 64 provided with the. The soil improving material hopper 61 has a length substantially covering the entire length in the width direction of the mixing container 20, and the front and rear wall surfaces are inclined in a direction approaching each other as going downward. Here, the area of the opening of the supply unit 64 is extremely small as compared with the dimension of the soil improvement material hopper 61 in the width direction, and the supply position of the soil improvement material to the soil improvement material hopper 61 is concentrated. However, there is a possibility that the storage amount varies. Therefore, in order to make the soil improving material uniformly wrap around the entire width of the soil improving material hopper 61, the soil improving material in-hopper feeding means 68 (see FIG. 5).

Further, a feeder 69 for supplying the soil improving material to the mixing vessel 20 is provided at the lower end of the soil improving material hopper 61. This feeder 69
As shown in FIG. 14 and FIG.
Rotating shaft 7 provided so as to penetrate the lower end of 1 horizontally.
The rotor has a rotor formed by continuously providing partition walls 71 at predetermined angles (in the illustrated example, at 90 ° intervals) at 0 °. A supply container section 72 is formed. The fixed-quantity supply container portion 72 has a pair of arc-shaped cut-off walls 73, 7.
It is located between the three. The radius of the arc forming the frayed wall 73 is determined from the rotation center of the rotation shaft 70 to the fixed supply container 7.
The length of the partition wall 2 is substantially equal to the length of the partition wall, and a slit-shaped opening is formed vertically between the abrasion walls 73. The upper opening is used as an inflow opening 74 through which the soil improving material is supplied from the soil improving material hopper 61 to the quantitative supply container 72, and the lower opening is used as the inlet for the soil improving material from the quantitative supplying container 72 to the mixing container 20. It becomes the outlet 75 for supply.

The rotary shaft 70 of the partition wall 71 is
6 (may be a hydraulic motor), and the soil improving material corresponding to the volume of the fixed-quantity supply container unit 72 is added to the mixing container 2 every time the rotary shaft 70 makes a quarter turn.
0 is supplied. Therefore, if the number of revolutions of the partition wall 71 by the electric motor 76 is changed, the supply amount of the soil improving material to the mixing container 20 can be adjusted. in this way,
A rotor composed of a partition wall 71 provided with a rotating shaft 70 has a function of supplying the soil improving material from the feeder 69 to the mixing vessel 20, and constitutes a soil improving material supply amount changing means. The feeder 69 has a length substantially covering the entire length of the mixing container 20 in the width direction, and the soil improving material is supplied to the mixing container 20 from the outflow opening 75 uniformly over substantially the entire length in the width direction. As a result, the soil improving material is supplied in a dispersed state in the mixing vessel 20,
The stirring efficiency will be improved.

When the soil improvement is performed using the soil improvement machine having the excavating means configured as described above, the left and right traveling bodies 10 and 10 in the lower traveling body 1 are driven to mount the work vehicle. It is arranged at a predetermined work position, the front work machine 3 is operated to excavate earth and sand, and the excavated earth and sand is injected into an earth and sand input hopper 40 constituting an earth and sand input section. Since the earth and sand input hopper 40 is provided with the forced feeding means 42, the earth and sand injected into the earth and sand input hopper 40 is smoothly fed into the mixing container 20. Further, since the sieve 41 is attached to the earth and sand input hopper 40, rocks, metals and the like are separated and only earth and sand are taken in. Mixing container 2
Since four paddle mixers 21 are provided in 0, the earth and sand injected by the rotation of the paddle mixers 21 are finely crushed and stirred, and are conveyed toward the rear side in a state of sand particles.

The earth and sand supplied into the mixing vessel 20 is continuously transferred to the mixing vessel 20 through the feeder 69 from the soil improving material hopper 61 constituting the soil improving material supply means 5 during the transport thereof. And added to the earth and sand. Therefore, the earth and sand and the soil improvement material are stirred by the rotation of the paddle mixer 21, and are uniformly mixed. The uniform soil is mixed with the soil improving material to form the improved soil, and the improved soil is sent out from the outlet formed by the opening at the rear end of the mixing vessel 20 to the discharge means 33 through the connecting portion 34. Will be able to

The mixing vessel 20 has four paddle mixers 21
The paddle mixers adjacent to each other rotate each paddle mixer 21 in the opposite direction, for example, in the direction of the arrow in FIG. Thereby, the lump of earth and sand can be completely broken, and it can be uniformly mixed with the soil improvement material. That is, the central 2
Between the paddle mixers of the book, the sediment and soil improvement material form a flow from the upper side to the lower side, and the paddle mixers at both ends form a flow from the lower side to the upper side. Stirring and mixing are performed extremely smoothly throughout the container 20.

The improved soil generated in the mixing vessel 20 moves to the discharging means 50 and is discharged from the discharging means 50. When moving from the mixing container 20 to the discharging means 50, the transfer direction is changed by 90 °, so that the crawler belt 14 does not step on the discharged improved soil.

In order to improve the quality of the improved soil produced as described above, the mixing ratio between the earth and sand and the soil improving material must be kept constant. Therefore, the supply amount of the earth and sand is measured, and the supply amount of the soil improvement material is controlled according to the supply amount of the earth and sand. For this purpose, means for measuring the supply amount of earth and sand is required. In addition, the amount of earth and sand transferred by the paddle mixer 21 in the mixing container 20 must be detected. The transfer amount of the earth and sand can be obtained by calculating from the height and the transfer speed of the earth and sand in the mixing container 20.

First, in order to measure the earth and sand transfer speed, the number of rotations of the rotary shaft 22 in the paddle mixer 21 may be detected as shown in FIG. For this purpose, the stirring hydraulic motor 28 (or the rotating shaft 22) is provided with a rotation speed detector 80 for determining the rotation speed. On the other hand, in order to measure the height of the earth and sand transferred in the mixing vessel 20, a distance measuring means is provided. Here, as the distance measuring means, for example, an ultrasonic sensor 81 can be used. The ultrasonic sensor 81 transmits an ultrasonic pulse toward the inside of the mixing container 20 and receives the reflected echo. From transmission of the ultrasonic pulse from the ultrasonic sensor 81 to reception of the reflected echo. By measuring the time, the height position of the surface of the earth and sand in the mixing vessel 20 is detected. As the means for measuring the height of the earth and sand, various types of noncontact and contact detection means other than the ultrasonic sensor 81 can be used. Therefore, the rotation speed detector 80
And the ultrasonic sensor 81 constitute a sediment transport amount measuring means.

The position of the ultrasonic sensor 81 is not essential, but the position of the earth and sand input hopper 40 in the mixing vessel 20 and the position of the feeder 69 constituting the soil improving material supply means 5 to which the soil improving material is supplied. It should be between the opening position. Further, in the mixing container 20, a stirring force acts on the earth and sand by the paddle mixer 21, and the earth mass collapses due to the stirring force. Therefore, the soil hopper 4
It is desirable to set it at a position closer to the feeder 69 than zero.

Since the ultrasonic sensor 81 measures the height position of earth and sand at points, it is necessary to increase the number of measurement points and take an average value to improve the measurement accuracy. For this purpose, as shown in FIG. 17, a mounting frame 32 is fixedly provided on the mixing container 20,
At least three ultrasonic sensors 81 are provided on the mounting frame 32.
To be installed. Also at the position where the ultrasonic sensor 81 is provided, the paddle mixer 21 is operated to stir the earth and sand. Therefore, the height position of the earth and sand always fluctuates. In order to accurately measure the height position of the earth and sand by the ultrasonic sensor 81, it is desirable to suppress the fluctuation of the height level of the earth and sand. For this purpose, as shown in FIG. 18, the paddle 23 of the rotating shaft 22 is connected to the ultrasonic sensor 81.
At the interval D before and after including the disposition position. Also, with respect to the four paddle mixers 21, each ultrasonic sensor 81 is provided in the space between the adjacent paddle mixers 21 and 21.

The rotational speed detector 80 of the stirring hydraulic motor 28
And a signal from the ultrasonic sensor 81 is taken into the control unit 82. The control unit 82 obtains an average value of the signals from the three ultrasonic sensors 81, and further, obtains an average value at a predetermined time, thereby obtaining the height level of the earth and sand at the measurement position in the mixing container 20, That is, the cross-sectional area of the earth and sand is obtained. Then, the transfer amount of the earth and sand can be calculated based on the cross-sectional area of the earth and sand and the earth and sand transfer speed obtained from the rotation speed detector 80. Therefore, the rotation speed detector 80 and the ultrasonic sensor 81 constitute the earth and sand transfer amount measuring means.

The control unit 82 has a mixing ratio setting means 83.
Is connected to the mixing ratio setting means 83, and the mixing ratio between the earth and sand and the soil improving material is input in advance with data obtained from, for example, experimental values. Further, in order to control the number of rotations of the rotary shaft 70 of the feeder 69 by the electric motor 76 based on the amount of soil transported measured as described above, the control unit 82 includes a drive control circuit 77 for the electric motor 76. A control signal is input to the mixing vessel 20. Based on the control signal, the number of rotations of the rotating shaft 70 is controlled, and the supply amount of the soil improving material to the mixing vessel 20 is adjusted according to the amount of soil transported. Is done. Thus, the mixing container 20
By adjusting the supply amount of the soil improving material supplied from the feeder 69 in accordance with the transport amount of the soil in the inside, the mixing ratio of the soil and the soil improving material becomes constant. In addition, the operation of the paddle mixer 21 allows the earth and sand and the soil improving material to be uniformly mixed. Therefore, the quality of the improved soil generated in the mixing vessel 20 is extremely high.

Incidentally, the earth and sand transfer amount measuring means composed of the ultrasonic sensor 81 and the like detects the amount of earth and sand transferred, so that the mixing ratio is the volume ratio. On the other hand, the mixing ratio between the earth and sand and the soil improvement material can be set as the weight ratio. Since the bulk density of the soil improvement material supplied from the feeder 69 is substantially constant, controlling the supply amount substantially controls the supply weight. On the other hand, the bulk density of the excavated soil or the like to be treated changes depending on its properties and conditions. Therefore, data on the bulk density as well as the amount of soil transported is required. Therefore, the bulk density of the earth and sand to be processed is measured in advance, and the data is provided to the control unit 82. Then, by multiplying the transported amount of the earth and sand measured by the earth and sand transported amount measuring means by this bulk density, the transferred weight of the earth and sand can be measured. As a result, the mixing ratio between the earth and sand and the soil improvement material can be set as a weight ratio.

Furthermore, if the earth and sand of approximately 80% of the rotation trajectory of the paddle mixer 21 is supplied into the mixing vessel 20, uniform stirring and mixing can be achieved, and the processing efficiency can be maximized. Therefore, as shown in FIG. 19 and FIG.
A gate plate 90 may be provided between the first and second members to limit the amount of earth and sand transported by the gate plate 90. Here, the gate plate 90 is installed within the range of the gap D between the paddles 23 of the rotating shaft 22 described above. The gate plate 90 is provided so as to be connected to a mounting plate 91. In this mounting plate 91, an ultrasonic sensor 81 constituting a sediment transport amount measuring means is mounted at a position downstream of the gate plate 90.

In the mixing vessel 20, the earth and sand is constantly stirred by the paddle mixer 21, and the height level of the earth and sand fluctuates. However, since the earth and sand are cut through the gate plate 90, the earth and sand are passed through. Immediately after passing through the gate plate 90, the variation in the height level of the earth and sand is the smallest, and the variation in the height in the width direction is also the smallest. Therefore, when the ultrasonic sensor 81 is provided at this position, the transport amount of the earth and sand can be measured more accurately.

[0042]

According to the present invention, the amount of earth and sand transferred in the mixing vessel can be accurately measured, so that the mixing ratio between the earth and sand and the soil improving material can be controlled very accurately. This makes it possible to produce high quality improved soil.

[Brief description of the drawings]

FIG. 1 is a side view of a soil improvement machine with excavation means showing one embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a plan view of a soil improvement mechanism showing one embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of the mixing container of FIG.

FIG. 6 is a perspective view showing a schematic configuration of a paddle mixer of FIG. 4 and a driving mechanism thereof.

FIG. 7 is a cross-sectional view of the mixing container of FIG.

FIG. 8 is an exploded perspective view of the earth and sand input hopper used in the embodiment of the present invention.

FIG. 9 is a front view of a discharging unit used in one embodiment of the present invention.

FIG. 10 is a perspective view of the discharging means of FIG. 9;

FIG. 11 is a front view of soil improvement means used in one embodiment of the present invention.

FIG. 12 is a sectional view of a main part of FIG. 11;

FIG. 13 is a left side view of FIG. 11 showing the soil improving material hopper and its feeder.

FIG. 14 is an operation explanatory view of the feeder of FIG. 13;

FIG. 15 is an operation explanatory view of a feeder showing an operation state different from that of FIG. 14;

FIG. 16 is a schematic configuration diagram of a mechanism for adjusting a mixing ratio between earth and sand and a soil quality improving material according to an embodiment of the present invention.

FIG. 17 is a configuration explanatory view showing an example of arrangement of the ultrasonic sensors in FIG. 16;

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

FIG. 19 is a cross-sectional view showing a configuration of earth and sand transfer amount measuring means provided in a mixing vessel according to another embodiment of the present invention.

20 is a sectional view taken along line YY of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving superstructure 3 Front work machine 4 Soil quality improvement mechanism 5 Soil quality improvement material supply means 10 Traveling body 20 Mixing container 20 Mixing container 21 Paddle mixer 22 Rotary shaft 23 Paddle 24 Drive unit 28 Hydraulic motor for stirring 40 Sand hopper 41 sieve 50 discharge means 60 soil improvement material storage section 61 soil improvement material hopper 69 feeder 70 rotating shaft 71 partition wall 74 drive control circuit 76 electric motor 80 rotation detector 81 ultrasonic sensor 82 control unit 83 mixing ratio setting means 90 gate plate

Continuing on the front page (72) Inventor Hisamoto Hagimoto 650, Kandate-cho, Tsuchiura-shi, Ibaraki Pref.Hitachi Construction Machinery Co., Ltd. Inside the Tsuchiura Plant (72) Inventor Satoshi Sekino 650, Kandamachi, Tsuchiura City, Ibaraki Prefecture Inside the Tsuchiura Plant, Hitachi Construction Machinery Co., Ltd. In-plant F-term (reference) 2D040 AB07 BA13 CD01 EB04 FA00 4G037 BC01 BD04 EA03 4G078 AA02 AB01 BA01 CA12 CA20 DA01 EA10

Claims (7)

[Claims] 1. A mixing vessel provided with a stirring / mixing means inside a work vehicle provided with a digging means, and a sediment input hopper into which the digging means inputs the earth and sand to supply the mixing vessel with the earth and sand. And a soil improvement material supply means for supplying a soil improvement material to the mixing vessel, wherein the soil improvement material supply means is provided in the soil improvement material supply means, and varies a supply amount of the soil improvement material to the mixing vessel. Soil improvement material supply amount variable means, installed at a position between the earth and sand input hopper and the soil improvement material supply means, and earth and sand transfer amount measurement means for measuring the amount of earth and sand transferred in the mixing vessel, Control means for taking in the signal from the earth and sand transfer amount measuring means and changing the supply amount of the soil improvement material by the soil quality improving material supply amount varying means to thereby keep the mixing ratio of the soil and soil quality improving material constant. And a soil improvement machine having excavation means. 2. The soil-improving material supply unit includes a soil-improving material storage unit, and a feeder that supplies the soil-improving material to the mixing container from the storage unit. A rotor provided in the feeder and configured to supply the soil improving material to the mixing container by a constant amount by rotation, and a motor for rotating the rotor, and controlling a rotation speed of the rotor based on a signal from the control unit. A soil improvement machine having the excavating means according to claim 1. 3. The sediment transport amount measuring means is disposed at an upper position of the mixing vessel, and is a distance measuring means for measuring a height dimension of the sediment, and a means for measuring a sediment transport speed by the stirring / transporting means. The soil improvement machine having the excavating means according to claim 1, characterized by: 4. The soil improvement machine having excavating means according to claim 3, wherein said distance measuring means comprises an ultrasonic sensor. 5. The soil improvement machine having excavating means according to claim 3, wherein said distance measuring means is provided in at least three places in the width direction of said mixing vessel. 6. The apparatus according to claim 1, wherein a plurality of said stirring / mixing means are provided in said mixing vessel, and said respective distance measuring means are provided between said mounting portions of said stirring / mixing means. Item 6. A soil improvement machine having the excavation means according to item 5. 7. The mixing vessel is provided with a gate for adjusting the amount of sediment supplied at a position between the earth and sand input hopper and the soil improvement material supplying means, and the distance measuring means is located downstream of the gate. The soil improvement machine having the excavating means according to claim 5, wherein the soil improving machine is arranged at the position of (1).