JP2000226864A - Self-traveling soil improving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent reduction in mixing accuracy of earth/sand and a soil improving material, and to minimize the length dimension in a treating tank. SOLUTION: Paddles 66 arranged on respective rotary shafts 65 of paddle mixers 64 arranged by two units in a treating tank 60 are installed with every 90 deg. in the rotation direction, and an installing pitch interval in the axial direction of the rotary shafts 65 is formed by the four paddles 66. A distance up to a discharge port 63 from an introducing port 62 of the treating tank 60 is set to almost three times the installing pitch interval of the paddles 66, an angle to the axis of the rotary shafts 65 of the paddles 66 is set to almost 45 deg., and the paddles 66 of the respective rotary shafts 65 are mutually inclined in the opposite direction. An interval between the rotary shafts 65, 65 is set to an interval slightly wider than the projecting length of the paddles 66, the paddles are installed by dislocating the installing pitch interval of the paddles 66 in both paddle mixers 64 by a 1/4 pitch, and a diameter in a rotational locus of the paddles 66 is made to almost coincide with the installing pitch interval of the paddles 66.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine used for improving soft ground and strengthening the ground, and for improving the quality of earth and sand to meet a predetermined purpose. The present invention relates to a self-propelled soil improvement machine that performs soil improvement while traveling appropriately.

[0002]

2. Description of the Related Art For example, in burial of gas pipes, water and sewage works, other road works, foundation works, etc., it is desirable to backfill the excavated soil, but the generated soil is not suitable for backfilling. There is also. In this case, it is necessary to carry out the excavated soil and carry in newly high-quality soil to fill the excavation site. Even if the generated soil is unsuitable for backfilling, it must be converted to reusable resources instead of being discarded. For this purpose, a method of performing soil improvement by mixing and solidifying a soil improvement material mainly composed of lime, cement, or the like into the excavated soil, and converting the excavated soil into high-quality soil that is suitably used for backfilling of excavated sites and the like. Has been proposed in the past.

[0003] As a typical example of a method of mixing earth and sand with a soil improving material, a mixing method using a stirring means and a crushing method provided with a rotary striker have been conventionally known. Among them, the mixing system is such that a stirring means is provided in a tank, earth and sand and a soil improvement material are charged into the tank, and the mixture is uniformly stirred and mixed by the stirring means. The stirrer performs a batch type process that only performs the function of stirring and mixing the inside of the tank, and a screw-type stirrer is provided to stir and mix the soil and soil improvement material in a predetermined direction. In some cases, a continuous process is performed in which the soil and soil improvement material are continuously supplied and the generated improved soil is continuously discharged.

[0004] Regarding the mixing system, whether it is a batch system or a continuous system, the treatment apparatus itself is generally configured as a stationary treatment plant. The processing plant will be equipped with processing equipment and ancillary facilities such as conveyors.The sediment collection site that will receive the soil that requires further soil improvement, and the improved soil deposition that will temporarily deposit the improved soil generated by the processing equipment. Location. However, since the soil to be improved is generated from the construction site, the amount of generated soil to be supplied to the treatment plant and the supply of the improved soil vary significantly. Therefore, in order to suppress this fluctuation, the scale of the processing plant must be increased,
In addition, the sediment to be received must be collected from a large area. As a result, long-distance transportation is required to carry in the earth and sand to be treated and to carry out the improved soil as a product, resulting in a problem such as an increase in product cost and a traffic obstacle due to frequent running of the dump truck.

[0005] A crushing type soil improvement machine as another method of soil improvement processing is disclosed in, for example, JP-A-9-19526.
This machine is effective as one method for solving the above-mentioned problem, which is disclosed in Japanese Patent Publication No. 5 and the like. This known soil improvement machine is of a self-propelled type. That is,
It has a lower traveling body having crawler belts and a chassis, a chassis is equipped with a crusher composed of a plurality of rotary impactors, a hopper for charging earth and sand, a hopper for supplying soil improvement material, and a supply from both hoppers There is provided a carry-in conveyor for carrying the soil and the soil improvement material to be used, and a carry-out conveyor for discharging the improved soil obtained by crushing by the crusher. In other words, a self-propelled vehicle is equipped with all the mechanisms necessary for soil improvement processing, and this machine is carried into a work site such as road construction or foundation work, and is excavated while running on the undercarriage. It is possible to improve the generated soil and backfill it directly at the excavation site. Therefore, since it is not necessary to carry out the earth and sand and carry in the improved soil by the dump truck, there is an advantage that the processing cost can be reduced and the dumping pollution can be suppressed.

However, in the crushing machine, the earth and sand which fall from the carry-in conveyor is crushed by being hit with a rotary impactor to be finely crushed and mixed with the soil improvement material. They cannot be mixed uniformly. Of course, if a large number of rotary hitters are provided to increase the number of hits, the degree of mixing of the earth and sand with the soil improving material is improved to some extent. However, since the earth and sand and soil improvement material are dropped by their own weight in order to apply a blow, increasing the number of impacts means increasing the falling distance of the soil and soil improvement material, that is, increasing the height of the crusher. You have to do it. Since the earth and sand and the soil improvement material are supplied from the hopper to the carry-in conveyor, the vehicle height of the entire vehicle becomes extremely high. As previously mentioned,
This crushing type soil improvement machine is carried to the construction site for processing, so when it is carried into the site, it must be transported on a general road using a trailer, etc. receive. Therefore, it is necessary to limit the height of the soil improvement machine as a whole, and there is a limit to increasing the number of hits by the rotary hitter, and it is impossible to provide at most about three rotary hitters in the height direction. Can not. As a result, there is a problem that it is not possible to sufficiently mix the soil and the soil improvement material by crushing.

[0007] From the above, the applicant of the present invention, in order to stably produce a high-quality improved soil uniformly stirred and mixed,
Developed a soil improvement machine that is portable, self-propelled and equipped with a continuous mixing device.
A patent application was filed as No. 47. The soil improvement machine according to the invention of the prior application has the following configuration.

[0008] A carry-in conveyor for transporting the earth and sand supplied from the earth and sand hopper and the soil improvement material supplied from the soil improvement material hopper to a main body frame of a vehicle having a crawler type traveling means, and the earth and soil improvement in the treatment tank. Mix the materials
The processing mechanism is provided with a stirring mechanism for transferring the soil in a substantially horizontal direction while stirring, and a carry-out conveyor for conveying the improved soil generated by the processing mechanism in a predetermined direction.
The treatment tank that constitutes the treatment mechanism is provided with an introduction section for introducing earth and sand and soil improvement material supplied from the carry-in conveyor at an upper portion on one side thereof, and the improved soil is provided on a carry-out conveyor at the lower portion on the other side. By providing the discharge section for discharging, the entire machine can be made compact, the size in the height direction can be particularly suppressed, and the portability is excellent.

[0009] Further, the carry-in conveyor is provided with earth and sand supply amount measuring means for measuring the amount of earth and sand supplied and conveyed from the earth and sand hopper, and the earth improvement material hopper is capable of adjusting the supply amount of the earth improvement material. By controlling the supply amount of the soil improvement material in accordance with the amount of soil transported by the soil supply amount measuring means, the mixing ratio between the soil and the soil improvement material is controlled to be constant. Further, as a stirring means provided in the processing tank, a plurality of paddle mixers provided with a plurality of paddles spirally at a predetermined pitch interval on the rotation axis, are arranged,
Each of the paddle mixers is configured to rotationally drive adjacent ones in opposite directions so as to uniformly mix the earth and sand with the soil improving material.

As described above, by using the paddle mixer, the earth and sand and the soil improving material can be stirred and mixed very uniformly, and the mixing ratio between the earth and sand and the soil improving material is accurately controlled. Will be of extremely high quality.

[0011]

By the way, in order to make the soil improvement machine a self-propelled type, mount it on a transportation means such as a trailer, and carry it into the yard where the soil for soil improvement is accumulated, It is necessary to reduce the size of the entire machine. Here, in the case of compactness, the dimension in the height direction is also important, but the reduction in the dimension in the length direction is also extremely important from the viewpoint of small turning during self-propelling and getting on and off the trailer. Since the processing tank is elongated in the running direction of the vehicle, the length of the processing tank in the axial direction greatly affects the length of the entire machine in the length direction. In addition, since it is difficult to completely discharge the earth and sand and soil improvement material put into the treatment tank, it is necessary to clean the inside of the treatment tank after the soil improvement work is completed. If the length is longer than necessary, there is a disadvantage that cleaning becomes troublesome. On the other hand, the length of the treatment tank has a very important effect on the degree of mixing between the earth and sand and the soil improvement material. If the length of the treatment tank is long enough, the soil and soil improvement material can be mixed uniformly, but if the length is shortened, the soil improvement material cannot be evenly dispersed in the soil, and as a product There is a problem that the quality of the improved soil is deteriorated.

The present invention has been made in view of the above points, and an object of the present invention is to provide a treatment tank which does not reduce the mixing accuracy of earth and sand and the soil improvement material, and furthermore, has a length dimension thereof. To minimize it.

[0013]

In order to achieve the above-mentioned object, the present invention provides a processing tank for transferring earth and sand and a soil improving material in a substantially horizontal direction while mixing and stirring the same in a main body frame of a traveling vehicle. A supply section for soil and soil improvement material is provided on one side of the treatment tank, and a discharge section for improved soil is formed on the other side. The paddles are attached in a spiral shape, and a plurality of paddle mixers for transferring the earth and sand and the soil improvement material in the treatment tank in a substantially horizontal direction while mixing and stirring are mounted by rotating the rotation shaft. It is characterized in that the transport distance of the earth and sand and the soil improvement material by the paddle mixer is set to be approximately three times the mounting pitch interval of the paddle in the axial direction of the rotating shaft.

Here, an even number of paddle mixers are mounted in the processing tank, and a mechanism for rotating these paddle mixers is provided with one end of each rotating shaft facing the drive unit, and The unit is provided with driving means for rotating one of the rotating shafts, and rotation transmitting means for transmitting the rotation from the driving means to another rotating shaft. It is desirable to configure the shafts to rotate in mutually opposite directions,
It is more preferable that the length of the processing tank is set to be approximately three times the diameter of the paddle mixer in terms of processing efficiency and the like. The nature of the earth and sand affects the stirring efficiency of the paddle mixer. In particular, when the water content of the earth and sand is too high, even if the treatment tank is set to the above-described length, it may not be possible to perform uniform stirring. Therefore, it is more desirable that the moisture content of the earth and sand supplied to the treatment tank be adjusted in advance to 40% or less.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show the configuration of the self-propelled soil improvement machine. First, in FIG.
Reference numeral 1 denotes a lower traveling body, and the lower traveling body 1 is a crawler track 1a.
And a crawler-type means having the following. Although the illustrated lower traveling body 1 is a crawler-type traveling means, taking into consideration the case where earth and sand are intermittently introduced, it is necessary to prevent the entire vehicle body from becoming unstable due to an impact load at the time of earth and sand introduction. This is to prevent it.

The lower traveling body 1 is provided with a body frame 2 constituting a chassis connected thereto.
Are provided with various mechanisms and devices. In this main body frame 2, when the left side in FIG. 1 is set to the front of the machine, a supply unit 3 is disposed at a front position. Further, a processing mechanism unit 4 is attached to the rear thereof, and further, a discharge unit 5 is provided toward the rear side from the processing mechanism unit 4. The discharge unit 5 extends obliquely upward from a position below the processing mechanism unit 4, and a machine room 6 containing a machine such as an engine, a hydraulic pump, and a directional switching valve unit is provided at an upper position of the processing mechanism unit 4. Is provided.

The supply section 3 is for supplying earth and sand and soil improvement material. The supply section 3 is provided with a carry-in conveyor 10 and, in the transport direction of the carry-in conveyor 10, is located on the most upstream side, that is, on the front side of the machine. 20 and a soil improving material hopper 30 is installed on the rear side. Further, the amount of earth and sand transported by the carry-in conveyor 10 is measured, and the supply amount of the soil improving material from the soil improving material hopper 30 is adjusted according to the measured amount.

The carry-in conveyor 10 is supported by a support 7 provided so as to protrude forward from the main frame 2 between the crawler belts 1a. Here, the support 7 is the lowest at the base end side and is inclined so as to rise obliquely upward as it goes to the side connected to the main body frame 2, so that the carry-in conveyor 10 also extends obliquely upward from the front side. Are located. The height position of the base end of the carry-in conveyor 10 is higher than the ground contact surface of the crawler belt 1a but lower than the main body frame 2.

As shown in FIG. 4, the carry-in conveyor 10 has a conveyor belt 11 (indicated by phantom lines). The conveyor belt 11 is made of a sheet-like rubber or the like. A configuration that bends by a corresponding amount is used. Reference numeral 12 denotes a conveyor frame, and at both ends of the conveyor frame 12, rotating shafts 13 connected to a driving roller 13 and a driven roller 14, respectively.
a and 14a are rotatably connected to each other,
Reference numeral 1 is provided by being wound between the driving roller 13 and the driven roller 14. A hydraulic motor 15 is connected to a rotating shaft 13a on which the driving roller 13 is provided. By rotating the rotating shaft 13a with the hydraulic motor 15, the driving roller 13 is driven to rotate and the transport belt 11 is moved as shown in FIG. They are sent in the direction of the arrow.

Guide plates 16 are provided on both left and right sides of the transport surface of the transport belt 11 so as to hold earth and sand so as not to overflow during transport. The guide plates 16 are located above the transport surface of the transport belt 11 by a predetermined height. It is protruding. Further, guide rollers 17 are provided on the transport belt 11 at predetermined pitch intervals in the transport direction. Further, the driven roller 1
The rotating shaft 14a on which the belt 4 is mounted is adjusted via the tension adjusting means 18 so that the tension of the transport belt 11 is kept constant. The tension adjusting means 18 is provided with means for detecting the degree of tension of the conveyor belt 11, such as a load sensor, so that the tension of the conveyor belt 11 is kept constant. However, illustration of these specific configurations is omitted.

The earth and sand hopper 20, as shown in FIG.
It is composed of a frame-shaped member that is open at the top and bottom, and sieving means 21 made of a sardine or the like is installed on the upper part thereof.
The sieving means 21 is for selectively passing earth and sand to separate massive solid foreign matters having a certain size or more, such as rocks and concrete pieces, so as not to enter the earth and sand hopper 20. The earth and sand supplied from the earth and sand hopper 20 to the conveyor belt 11 is conveyed along the conveyor belt 11, and the height of the earth and sand from the earth and sand hopper 20 is equal to the height of the guide plate 1.
Gate 2 to limit the protrusion height of 6
2 is formed, and when the conveyor belt 11 is sent, the conveyor belt 11 is conveyed in a state where a bulk of earth and sand corresponding to the height set by the gate 22 is accumulated. A leveling roller 23 is provided on the exit side of the gate 22 to level the sediment deposited on the conveyor belt 11 that has passed through the gate 22. Has been established. Thereby, the height of the conveyed earth and sand is adjusted so as to be substantially constant.

Next, the soil improving material hopper 30 is fixedly held on the main body frame 2 by the columns 9, and the structure thereof is as shown in FIGS. The soil improving material hopper 30 is composed of a storage section 31 and a fixed quantity supply section 32. The storage section 31 has a cylindrical portion 31a at a lower portion, and a square box portion 31b is continuously provided on an upper side. A lid 33 is provided at the upper end of the rectangular box portion 31b, and the lid 33 is composed of two lid pieces 33a. Each lid piece 33a is opened outward, and in the fully opened state, each lid piece 33a is opened diagonally upward by a stopper having an appropriate configuration. The soil improvement material is supplied from the flexible container 34 to the storage unit 31.

A cutter 35 whose cutting edge protrudes upward is mounted in the storage section 31. When the flexible container 34 is placed in the soil improvement material hopper 30, its lower end is cut by the cutter 35 by its own weight. Since it will be cut off, the soil improvement material in the flexible container 34,
For example, lime, cement, and the like are supplied so as to flow into the storage section 31, particularly into the cylindrical section 31a. When the lid 33 is closed, scattering of the soil improvement material is prevented. As is clear from FIG. 7, the communication between the cylindrical portion 31 a and the fixed-quantity supply unit 32 is established by the communication hole 36, so that the soil improving material is supplied into the fixed-quantity supply unit 32. Further, in order to promote the supply of the soil improvement material to the fixed quantity supply unit 32, a rotating rod 37 is arranged in a cross shape near the bottom surface of the cylindrical part 31a, and the rotating rod 37 is attached to the lower part of the cylindrical part 31a. Is connected to a rotary shaft 39 that is driven to rotate by a hydraulic motor 38 provided in the motor.

The fixed-quantity supply section 32 has a casing 40 having the same size as the width of the conveyor belt 11 in the carry-in conveyor 10, and the lower end of the casing 40 has substantially the same length as the entire length of the conveyor belt 11. Alternatively, a soil improving material supply port 41 composed of a slightly narrower elongated hole is formed, and the soil improving material sent from the storage section 31 to the fixed quantity supply section 32 is fed from the soil improving material supply port 41 to the conveyor belt. It is configured to supply the earth and sand conveyed by 11.

As shown in FIG. 8 and FIG. 9, the wall surface near the lower end of the casing 40 of the quantitative supply unit 32 where the soil improvement material supply port 41 is opened is an arc-shaped wall portion 40a opposed to each other. , 40a, and a fixed-quantity feeder 4 is provided between the arc-shaped wall portions 40a, 40a.
2 are provided. This fixed-quantity feeder 42 forms a partition 44 at a predetermined angle (every 90 ° in the illustrated example) on a rotating shaft 43 provided in a state penetrating the lower end portion of the casing 40 in the horizontal direction. As a result, the fixed-quantity supply container portion 4 having a V-shaped cross section between adjacent partition walls
5 are formed. The width of the soil improvement material supply port 41 is set to be equal to the width of the adjacent partition walls 44 and 4.
The interval between the four is equal to or smaller than the interval between the four, and the arc-shaped wall portion 40a has an arc of at least 90 ° or more.

When the rotating shaft 43 is rotated, the tips of the partition walls 44 constituting the four fixed-quantity supply container portions 45 are in sliding contact with the arc-shaped wall portions 40a. Functions as a scraping wall of each fixed-quantity supply container unit 45, and the fixed-quantity supply feeder 42 is displaced from the state of FIG. 8 to the state of FIG. The amount of the soil improving material corresponding to the volume of the fixed amount supply container portion 45 is supplied onto the conveyor belt 11. Therefore, by adjusting the rotation speed of the rotating shaft 43, the supply amount of the soil improving material from the fixed quantity supply unit 32 can be controlled. An electric motor 46 is mounted on the outer surface of the casing 40 in order to finely control the rotation speed of the rotating shaft 43 of the fixed-quantity feeder 42, and a transmission is provided between the electric motor 46 and the rotating shaft 43. Power transmission means 47, such as a belt, is interposed.

The supply amount of the soil improving material is changed according to the amount of the earth and sand conveyed by the conveyor belt 11. In order to accurately detect the amount of the earth and sand conveyed by the conveyor belt 11, the earth and sand supply amount measuring means 50 is provided. The earth and sand supply amount measuring means 50 specifically detects the weight of the earth and sand conveyed. is there. To this end, a specific example of the earth and sand supply amount measuring means 50 has a configuration shown in FIGS. 10 and 11.

In these figures, 51, 51 are fixedly supported by the conveyor frame 12, and
1 is a pair of fixed rollers that abut against the back surface of the roller 1 and roll by feeding the fixed rollers 51, 51.
The area between them is the sediment supply measurement section. Fixed rollers 51, 51 before and after constituting this earth and sand supply amount measurement section.
A weight measuring roller 52 is attached at a substantially intermediate position between the conveying belt 11 and the rear surface of the conveyor belt 11. Here, as described above, the transport belt 11 is moved by the load.
That is, the belt is bent in accordance with the weight of the earth and sand deposited thereon, and the weight measuring roller 52 is for detecting the degree of bending of the transport belt 11.

The weight measuring roller 52 is provided so as to be connected to a swing plate 54 which is swingably supported by a bearing member 53 provided on the conveyor frame 12, and the other end of the swing plate 54 is provided at the other end. , A load sensor 55 including a load cell or the like constituting a weight measuring means is provided in connection therewith. Therefore, when a predetermined amount of earth and sand is conveyed on the conveyor belt 11 and conveyed, the portion of the conveyor belt 11 where the earth and sand are accumulated is conveyed to the sediment supply measurement section between the fixed rollers 51 and 51. Then, the transport belt 11 bends so as to sink. As a result, the weight measuring roller 52 is pushed in the direction indicated by the arrow D in FIG. 11, and the rocking plate 54 to which the weight measuring roller 52 is connected tends to swing in the direction indicated by the arrow U in FIG. As a result, the amount of earth and sand conveyed by the conveyor belt 11 can be measured based on the detection signal.

As described above, the processing material composed of the earth and sand and the soil improving material is transported by the transport belt 11 constituting the carry-in conveyor 10, and the end of the carry-in conveyor 10 is processed by the processing mechanism 4. It is connected to the tank 60. The processing tank 60 is configured by opening the upper surface of the tank main body 60a over a predetermined range, and fixing the lid body 60b to this opening in a detachable manner with bolts or the like. Tank body 60
a is fixedly installed on the upper surface of the main body frame 2,
The machine room 6 located above the lid 60b is
0b is in a non-contact state.
The lid 60b can be separated from the tank main body 60a while keeping the main body 0 on the main body frame 2. Processing tank 6
0, the processing material is supplied from the upper side of the carry-in conveyor 10, but by extending the carry-in conveyor 10 so as to face diagonally upward, the earth and sand hopper 20 located at the most upstream side of the carry-in conveyor 10 is set at a lower position. Can be placed at the same time, facilitating the introduction of earth and sand.

FIGS. 12 to 15 show the internal structure of the processing tank 60 constituting the processing mechanism section 4. FIG. The processing tank 60 is configured as shown in FIG.
As is clear from FIG. 2, the main body frame 2 is formed of a rectangular container arranged in the longitudinal direction, that is, substantially in the horizontal direction. An inlet 62 forming an inlet for a processing material composed of earth and sand and a soil improving material is connected to an upper portion on the front side of the processing tank 60, and an outlet 63 forming an outlet is connected to a lower portion on the rear side. It is provided. As shown in FIGS. 13 to 15, two paddle mixers 64 are provided in the processing tank 60 in parallel. The number of paddle mixers is not limited to this, but is set to an even number for uniform stirring. The paddle mixer 64 has a rotating shaft 65, on which a paddle 66 composed of intermittent blades is implanted in order to transfer the processing material while stirring. Paddle 66 is rotating shaft 65
Are arranged in a substantially spiral shape on the outer peripheral surface of the rotating shaft 65, and are inclined at a predetermined angle with respect to the axis of the rotating shaft 65. The paddle body 66b is attached to a support rod 66a fixedly attached to the rotating shaft 65 by a bolt 66c.
The paddle body 66b can be replaced when worn out.

Both ends of the rotary shaft 65 of each paddle mixer 64 are rotatably supported by bearings 67, 67, and the front end of the rotary shaft 65 is connected to the front end of the processing tank 60 as shown in FIG. It extends into the housing of the provided drive unit 68. 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 transmission gear has a hydraulic motor 7.
A drive gear 71 connected to the output shaft 0 is meshed. By rotating the hydraulic motor 70, the two rotating shafts 65, 65 provided with the paddles 66 are simultaneously rotated in opposite directions. You.

The paddles 66 provided on each of the two paddle mixers 64 are mounted at every 90 ° in the rotational direction, so that the four paddles 66 form one spiral pitch. This is the mounting pitch interval of the paddle 66 in the axial direction of the rotating shaft 65. The angle of each paddle 66 with respect to the axis of the rotation shaft 65 is approximately 45 °. Since the two paddle mixers 64 rotate in directions opposite to each other, the paddles 66 implanted on their rotation shafts 65 are inclined in directions opposite to each other. Further, the rotating shaft 6
The interval between the pads 5 and 65 is set to be slightly wider than the protruding length of the paddle 66. In order to prevent the paddles 66 from interfering with each other when the paddle mixers 64 are rotated, the paddles 66 are mounted so that the mounting pitch intervals of the paddles 66 in both paddle mixers 64 are shifted by ４ pitch. Further, the diameter of the paddle 66 in the rotation trajectory substantially coincides with the mounting pitch interval of the paddle 66.

By configuring the paddle mixer 64 as described above, the processing material in the processing tank 60 can be efficiently and uniformly stirred. Here, in order to uniformly stir and mix the processing material in the processing tank 60,
, Approximately 80% of the rotation trajectory of the paddle 66
The supply amount of the processing material is adjusted so as to have a height level corresponding to. In addition, there are parts of the processing tank 60 that cannot be agitated by the paddle 66. For this purpose, a guide plate 72 is attached from the bottom to both sides in the processing tank 60, and the guide plate 72 prevents the processing material from staying at the corner at the lower end of the processing tank 60. are doing. However, the portion of the guide plate 72 corresponding to the outlet 63 is open.

As described above, in the processing tank 60, an improved soil in which the processing material composed of the earth and sand and the soil improving material is uniformly mixed is produced. The improved soil is discharged from the discharge port 63 by the action of its own weight. It is discharged to 5. The discharge section 5 is provided at the unloading conveyor 73
Consists of Since the outlet 63 is located below the processing tank 60, the unloading conveyor 73 uses the outlet 6.
3 below. However, unloading conveyor 7
If the straight line 3 is directly extended, the improved soil cannot be accumulated at a high level. Therefore, the improved soil is dropped from a predetermined height position by extending the discharge conveyor 73 obliquely upward. Further, by making the leading end of the unloading conveyor 73 bendable as shown by the imaginary line in FIG. 1, the whole can be made compact.

With the above configuration, FIG.
The soil improvement process can be performed as shown in FIG. The figure shows a small-scale yard, in which sediment to be soil-improved is accumulated in advance.
In this soil improvement machine, a soil hopper 20 is provided, and soil is introduced into the soil hopper 20 to improve the soil. For this purpose, a means for charging earth and sand is required, and the means for charging earth and sand can be provided by providing a front working mechanism having a bucket on the soil improvement machine.
The earth and sand can be charged by itself, but when such a mechanism is not provided, the earth and sand is charged by using the hydraulic excavator PS. Therefore, the soil improvement machine and the hydraulic excavator PS are carried into the yard, and the soil of the accumulated soil is improved. In addition, the produced soil is sequentially deposited in a space generated by the earth and sand being taken into the soil improvement machine from the accumulation part. As a result, most of the space in the yard substantially serves as both a sediment accumulation site and an improved soil accumulation site, and the yard space can be effectively used. The soil improvement machine is the undercarriage 1
It is for this reason that the self-propelled structure is used to move the lower traveling body 1 as the work progresses and the sedimentation site recedes.
To move the soil improvement machine.

When the produced improved soil is deposited at a predetermined position on the discharge conveyor 71 and classified according to the particle size of the improved soil, a sorting device 75 is provided. The sorting device 75 is configured as a portable type, and includes a sieve 76 and a transfer conveyor 77. The sieve 76 has a mesh size that allows passage of a predetermined particle size or less, for example, 13 mm or less, 20 mm or less, 25 mm or less, and is desirably constituted by a vibrating sieve.
After passing through the sieve 76, the improved soil having a uniform particle size is deposited on a predetermined deposition location by the transfer conveyor 77.

In order to improve the quality of the improved soil produced as described above, the degree of solidification is set within a predetermined range. For this purpose, the mixing ratio between the earth and sand and the soil improving material is accurately adjusted, and the soil and the soil improving material are sufficiently stirred and mixed.

First, as for the mixing ratio of the soil and the soil improving material, the degree of solidification due to the addition of the soil improving material may vary depending on the properties of the soil and the like. Therefore, a desirable mixing ratio is determined in advance by experiments or the like. The mixing ratio between the earth and sand and the soil improvement material may be set as a volume ratio or as a weight ratio. The mixing ratio is desirably set as a weight ratio in consideration of the relationship with the density and viscosity of the earth and sand.

The weight of the earth and sand sent out from the earth and sand hopper 20 is measured by the earth and sand supply amount measuring means 50, and the fixed amount feeder 42 of the soil improving material hopper 30 is located at a position downstream of the earth and sand supply amount measuring means 50 in the carry-in conveyor 10. Is adjusted based on the signal from the load sensor 55 to change the supply amount of the soil improving material, thereby making it possible to stabilize the mixing ratio between the soil and the soil improving material.

The reason why the processing tank 60 containing the paddle mixer 64 is used is to stir and mix the soil and the soil improving material as uniformly as possible. Two paddle mixers 64 are provided in the processing tank 60, and rotate in mutually opposite directions as shown by arrows in FIG. Therefore, inside the processing tank 60, a swirling flow is formed over substantially the entire area by the shearing and stirring action of the paddle 66 attached to the rotating shaft 65 of the paddle mixer 64, and the entire inside of the tank is stirred as a result. The earth and sand and the soil improvement material are uniformly mixed.

By the way, in the processing tank 60, the processing material composed of the earth and sand and the soil improvement material is mixed, and the inlet 62
From the processing tank 60 to the discharge port 63
Due to the finite length dimension, the processing material must be uniformly mixed during its transfer. In addition, since the soil is improved while traveling on a small scale yard, it is necessary to make the turn as small as possible, and in order to reuse the yard between multiple yards, transportation by transportation such as a trailer is necessary. From, the whole machine is made as small as possible,
Must be compact. The size of the processing tank occupying the whole soil improvement machine is large, and particularly, the size in the longitudinal direction has a very large influence on the size of the whole machine. Further, even with a small and compact configuration, it is necessary to increase the soil improvement processing capacity and processing efficiency as much as possible.

In view of the above, first of all, in order to obtain a high-quality improved soil, the highest priority is given to the best mixing degree of the earth and sand with the soil improving material. The dimension in the direction is reduced as much as possible, and the soil improvement treatment efficiency is improved.

Since the mixing of the earth and sand with the soil improving material is performed by the paddle mixer 64, the relationship between the configuration of the paddle mixer 64 and the mixing efficiency was studied.
The paddle mixer 64 has a plurality of paddles 66 attached to the outer peripheral surface of the rotating shaft 65. In order to transfer the processing material in the processing tank 60 while mixing, the paddle 66 has a spiral shape around the rotating shaft 65. Attached to be.

Now, as shown in FIG. 17, since the paddle PD is attached to the rotation axis RS of the paddle mixer PM at every 90 °, the interval between every fourth paddle becomes the installation pitch interval P. The mounting pitch interval between the paddles PD of the two adjacent rotary shafts RS is arranged to be shifted by a distance of approximately １ ／ of the mounting pitch interval P. Therefore, in the axial direction of the paddle mixers PM arranged adjacent to each other, the paddles PD are opposed to each other with a small gap at every mounting pitch interval P. As a result, when viewed in the axial direction of the rotation shaft RS, that is, in the transport direction by the paddle mixer PM, adjacent paddles PD overlap each other at every mounting pitch interval P, and are spaced apart at an intermediate position.

Therefore, when the paddle mixer PM is operated, the processing material located outside the respective rotation axes RS is scooped up at the portions where the paddles PD are separated, so that the paddles PD are moved upward. The processing material, which has been moved upward in accordance with the approach of
After moving in the direction of merging toward S, the movement is downward. The processing material is mixed from the left and right at the portion where the paddle PD overlaps during the downward operation of the processing material. That is, in terms of stirring efficiency, paddle P
The portion where D overlaps is most efficiently stirred and mixed.

Therefore, in FIG.
, The paddle mixer PM is operated, and the
While stirring and mixing from ST, move in the direction indicated by the arrow in FIG.
With the processed material transported to the specified position.
Stop the operation of the paddle mixer PM, and in each position
The degree of mixing of the treated materials was measured. Measurement is in the transport direction
At a predetermined width MB, and in a direction orthogonal to the transport direction.
A grid-shaped small partition AR was formed at predetermined intervals ML.
Then, each width MB is arranged in a direction orthogonal to the transfer direction.
Detecting the content of soil improvement material in each small compartment AR
And measure the degree of variation in each small section AR
did. FIG. 18 shows the measurement results. In this figure 18
The vertical axis is the degree of mixing, the horizontal axis is the length of the treatment tank, and P₁,
P₂, P ₃,... Are paddle mounting pitch intervals.

As is apparent from FIG. 18, the mounting pitch interval of the paddle PD in the paddle mixer PM is 2.5
It can be seen that the degree of mixing is approximately 0.8 to 1 at a nearby position, that is, the content of the soil improvement material in each small partition AR arranged in a direction orthogonal to the transport direction is substantially constant. Further, even if the mounting pitch interval is longer than that, the degree of mixing is not substantially improved.

From the results of this experiment, the transfer distance of the processing material by the paddle mixer was set to be at least 2.5 times the mounting pitch interval of the paddles attached to the paddle mixer, and approximately three times the mounting pitch interval in consideration of errors due to the condition of earth and sand. By setting the length, the earth and sand and the soil improvement material can be uniformly mixed to the extent necessary for practical use, and the length of the paddle mixer is minimized. Therefore, as shown in FIG. 13, paddles 66 for three pitches of the mounting pitch are provided on the two rotating shafts 65 provided in the processing tank 60. That is, the distance from the inlet 62 to the outlet 63 in the processing tank 60 is set to be approximately three times the mounting pitch P of the paddles 66. Thereby, the length in the longitudinal direction of the processing tank 60 can be suppressed to the minimum, and the earth and sand and the soil improving material can be uniformly mixed.

Thus, the length of the processing tank 60 in the longitudinal direction can be minimized, and the processing tank 60 can efficiently produce high-quality improved soil. As described above, when the size and size of the processing tank 60 are reduced, the overall length of the soil improvement machine is shortened, so that the machine can be easily turned during traveling and can be conveniently transported.

By the way, the size of the processing tank 60, the stirring efficiency of the processing material, and the transfer speed in the processing tank 60 depend on the rotating shaft 6.
It largely depends on the number of paddles 66 to be mounted on 5 and its angle and turning radius. If the number of paddles 66 in one pitch is too small, the stirring efficiency per rotation of the rotating shaft 65 will decrease, and if it is too large, interference between the paddles may occur. Therefore, it is desirable that the number of paddles 66 per pitch be four (ie, 90 ° intervals) or three (ie, 120 ° intervals).
On the other hand, with respect to the mounting angle of the paddle 66 to the rotating shaft 65, the larger the inclination angle of the paddle 66 with respect to the axis of the rotating shaft 65, that is, the closer to the right angle to the axis of the rotating shaft 65, the lower the transfer speed of the processing material. Become slow. On the other hand, the smaller the inclination angle is, that is, the closer to the direction parallel to the axis of the rotating shaft 65, the higher the transfer speed of the processing material. However, if the angle is less than a certain angle, the transfer of the processing material will be left behind. Therefore, the angle of the paddle 66 is 4
It is desirable to be around 5 °. Then, when the rotating shaft 65 to which the paddle 66 is attached is rotated at a high speed at this angle,
The jumping of the processing material further improves the stirring efficiency, and also makes the transfer speed desirable. In addition, paddle 66
, That is, the longer the paddle 66 protrudes from the rotation shaft 65, the higher the stirring efficiency. However, if a too large paddle is used, the load on the rotating shaft 65 will increase. Therefore, considering the bending strength of the rotating shaft 65 and the stirring efficiency of the paddle 66,
It is desirable that the diameter of the rotation trajectory at the tip of the paddle 66 be substantially the same as the mounting pitch interval P of the paddle 66.

As described above, the number of the paddles 66 mounted on the rotary shaft 65, the angle thereof, and the radius of rotation thereof have some desirable ranges based on the stirring / mixing efficiency of the processing material and the transfer efficiency thereof. Within this range, as described above, the distance between the inlet 62 and the outlet 63 in the processing tank 60 is set to be approximately three times the mounting pitch interval P of the paddle 66 so that the processing tank 60 can be minimized. Very high quality improved soils can be efficiently produced with a length dimension of.

By the way, the stirring efficiency in the processing tank 60 varies depending on the nature of the earth and sand to be charged. As described above, when the length of the processing tank 60 is shortened, the processing materials may not be mixed uniformly. Occurs. In particular, if the water content in the soil is high, the viscosity will increase accordingly, making it difficult to mix the soil improvement material uniformly.If the water content is extremely low, the mixing state by stirring will be stable. In addition, when lime is used as a soil improvement material, the reaction with earth and sand is impaired, and the aggregate structure is not obtained. Therefore, processing tank 6
In order to stabilize the accuracy of the soil improvement treatment at zero, the moisture content of the injected earth and sand must be adjusted to some extent. Here, it is desirable that the water content of the earth and sand does not exceed 40%, and it is more preferable that the water content does not fall below 30%. Therefore, prior to charging into the processing tank 60, the water content of the earth and sand is adjusted. That is, when the water content is higher than 40%, the water content is reduced to 40% or less by mixing dry earth and sand or lime. on the other hand,
When the water content is lower than 30%, the water content is increased by spraying water or the like.

In the above-described embodiment, the earth and sand and the soil improving material are supplied onto the carry-in conveyor, and the soil and the soil improver are simultaneously supplied from the carry-in conveyor into the treatment tank. However, it is also possible to adopt a configuration in which the earth and sand and the soil improvement material are respectively directly charged into the processing tank from the hopper. In this case, among the hoppers, the length from the position of the hopper (usually a soil improvement material hopper) located downstream of the processing tank to the discharge port is set to be three times the paddle mounting pitch interval.

[0055]

As described above, according to the present invention, the length of the processing tank can be reduced to the minimum length necessary for uniformly mixing the earth and sand with the soil improving material inside the processing tank. This has the effect of reducing the size and size of the device.

[Brief description of the drawings]

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

FIG. 2 is a plan view of FIG.

FIG. 3 is a left side view of FIG.

FIG. 4 is a diagram illustrating a configuration of a carry-in conveyor according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view of the earth and sand hopper according to the embodiment of the present invention.

FIG. 6 is a sectional view of a soil improvement material hopper according to the embodiment of the present invention.

FIG. 7 is a sectional view taken along line XX of FIG. 6;

FIG. 8 is an operation explanatory view of a fixed quantity supply mechanism in the soil improvement material hopper of FIG. 7;

FIG. 9 is an operation explanatory view of the fixed quantity supply mechanism showing an operation state different from that of FIG. 8;

FIG. 10 is an explanatory diagram of a configuration of a sediment supply amount measuring unit according to the embodiment of the present invention.

11 is an explanatory view of the principle of measuring the amount of earth and sand supplied by the earth and sand supply amount measuring means of FIG. 10;

FIG. 12 is an external view of a processing tank constituting a processing mechanism in an embodiment of the present invention, omitting a paddle mixer.

FIG. 13 is a cross-sectional view of the processing tank of FIG.

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

FIG. 15 is a sectional view taken along the line ZZ of FIG. 13;

FIG. 16 is an operation explanatory view showing a state in which soil improvement is performed in the yard by the soil improvement machine according to the embodiment of the present invention.

FIG. 17 is an explanatory diagram showing a relationship between a mounting pitch interval of a paddle of a paddle mixer and a degree of mixing of earth and sand and a soil improvement material in a processing tank.

FIG. 18 is a diagram showing the relationship between the degree of mixing of earth and sand with the soil improving material in the length direction of the treatment tank in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Main body frame 3 Supply part 4 Processing mechanism part 5 Discharge part 10 Carry-in conveyor 20 Sediment hopper 30 Soil improving material hopper 60 Processing tank 64 Paddle mixer 65 Rotary shaft 66 Paddle 68 Drive unit 69 Transmission gear 70 Hydraulic motor 71 Drive gear

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E02D 3/12 103 E02D 3/12 103 (72) Inventor Toshikazu Murai 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi (72) Inventor Takami Kushiro 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. (72) Inventor Satoshi Sekino 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery F-term in Tsuchiura Plant (reference) 2D040 AA01 CA01 CA03 CA09 CB01 CD07 EA02 4G035 AB48 AE13 4G037 AA03 AA11 DA21 DA30 EA03 4G078 AA03 AB20 BA01 BA07 BA09 CA01 CA05 CA12 CA19 DA01 DA30 DB03 DB10 DC10 EA10

Claims (4)

[Claims] 1. A processing tank for transferring earth and sand and a soil improving material in a substantially horizontal direction while mixing and stirring is installed on a main body frame of a traveling vehicle, and one side of the processing tank supplies the soil and the soil improving material. And an improved soil discharging portion is formed on the other side, and a paddle is helically attached to the outer peripheral surface of the rotating shaft at a predetermined interval in the treatment tank, and the rotating shaft is driven to rotate. Accordingly, a plurality of paddle mixers for transferring the earth and sand and the soil improvement material in the treatment tank in a substantially horizontal direction while mixing and stirring are installed, and the transfer distance of the soil and the soil improvement material by the paddle mixer is adjusted by the rotation of the paddle. A self-propelled soil improvement machine characterized in that the pitch is approximately three times as large as an installation pitch in the axial direction of the shaft. 2. An even number of the paddle mixers are mounted in the processing tank, and one end of each of their rotation shafts is provided facing a drive unit, and the drive unit has one of the rotation shafts. A drive unit for rotating the rotating shaft, and a rotation transmitting unit for transmitting rotation from the driving unit to another rotating shaft, and the rotating transmitting unit is configured to rotate adjacent rotating shafts in opposite directions. 2. The self-propelled soil improvement machine according to claim 1, wherein the self-propelled soil improvement machine is configured to be rotated. 3. The self-propelled soil improvement machine according to claim 2, wherein the length of the processing tank is set to be approximately three times the diameter of the paddle mixer. 4. The self-propelled soil improvement machine according to claim 1, wherein the earth and sand charged into the treatment tank is adjusted so that the water content thereof is 40% or less.