JP2000355930A - Soil improvement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optimally adjust the quantity of soil and sand supplied in response to the state and properties or the like of soil and sand fed to a mixing vessel. SOLUTION: In the soil improvement device, soil and sand and a soil improvement material are mixed uniformly during a time when a mixed material composed of soil and sand and the soil improvement material is transferred from an opening 22 for supplying the mixed material to an opening 23 for discharging improved soil by a paddle mixer 24 in a mixing vessel 20, but a road sectional area is adjusted by the state and properties or the like of soil and sand. Accordingly, a gate plate 33 limiting the road sectional area on the inside of the mixing vessel 20 is installed at a position near to the opening 22 for supplying the mixed material in the mixing vessel 20, and both end sections of the gate plate 33 are inserted to guide rails 34, 34 and lifted and lowered and driven by a hydraulic cylinder, and can be displaced between a lowering position, where approximately 20% of the upper sections of the rotary loci of the paddles 26 in the paddle mixer 24 is covered with the gate plate 33, and a lifting position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for improving soft ground and strengthening the ground. The present invention relates to a method for improving the quality of earth and sand so as to meet a predetermined purpose. The present invention relates to a soil improvement device that mixes the soil.

[0002]

2. Description of the Related Art For example, when burying gas pipes, water and sewage works, other road works, and foundation works, it is desirable to backfill soil generated by excavation. Some are not suitable. In this case, the excavated soil must be discarded and the excavated area must be filled with new high-quality soil. Examples of the earth and sand that are not suitable for backfilling include, for example, rocks, brick pieces, concrete pieces, and a large amount of metal and other foreign substances. Also, if the soil itself is soft and backfilled as it is, such as clayey soil with extremely small particle size and highly viscous soil, or soil that is too hard to solidify due to excessive weathering, land subsidence will occur. Some can occur.
Poor soil generated by excavation at a construction site or the like is a kind of industrial waste, and its disposal place is restricted. Therefore, there is an increasing demand for converting poor soils into reusable resources.

[0003] If foreign matter is mixed in the excavated soil, it can be reused as it is by removing such foreign matter by sieving or the like. On the other hand, in the case of soft soil that may cause land subsidence when backfilled, soil remediation processing must be performed in order to make the soil reusable. The soil improvement in this case is, for example, to mix a soil improvement material mainly composed of lime, cement, or the like with the earth and sand to solidify it, and thereby convert the soil into high-quality soil for backfilling of excavated sites. it can.

[0004] In the soil improvement treatment for solidifying the soil, a typical mixing method of the soil and the soil improvement material is a mixing method using a stirring means disclosed in International Patent Application Publication No. WO98 / 53148. And JP-A-9-
A crushing method provided with a rotary striker as proposed in 195,265 or the like has been conventionally known. In the mixing method, a stirring and mixing means is provided in a tank, earth and sand and a soil improving material are charged into the tank, and the mixing is uniformly performed by the stirring and mixing means. The mixing / mixing means performs batch-type processing that only exerts the function of mixing the inside of the mixing vessel, and the mixing / mixing means of the screw type, paddle type, etc. are provided in the mixing vessel, and the soil and soil improvement material And in a continuous processing system configured to transfer in a predetermined direction while mixing.

The above-mentioned International Patent Application Publication WO98 / 53
No. 148 discloses a continuous processing system, which is a self-propelled system combining the functions of a hydraulic excavator. It is also used as a stationary soil improvement device, and is not combined with a hydraulic excavator.
A self-propelled soil improvement device has also been developed. A great demand is expected in the future for a mixing type soil improvement apparatus capable of continuous processing, because the soil improvement processing can be performed with high accuracy and efficiency.

[0006] As a configuration of a mixing type soil improvement device capable of continuous processing, a mixing and mixing means is mounted in a long box-shaped mixing container, and one end of the mixing container is provided. Is provided with a supply section for the earth and sand and the soil improving material, and a discharge section for the improved soil in which the sand and the soil improving material are uniformly mixed is provided on the other end side. As the stirring / mixing means, a paddle mixer having a large number of paddles mounted on a rotating shaft is preferably used. An even number of the paddle mixers are disposed in the mixing container, and one of the rotation shafts is driven to rotate so that the adjacent rotation shafts are rotated in opposite directions. In addition, as a supply section of soil and soil improvement material,
A soil hopper and a soil improvement hopper are used, and the soil hopper is disposed on the upstream side (front side) in the direction of transport of the mixed material including the soil and the soil improvement material by the paddle mixer, and the soil improvement hopper is located in a position close to the soil hopper. In addition, it is disposed downstream of the earth and sand hopper. The direction of discharging the improved soil by the discharging section of the improved soil is set to be an extension of the transfer direction of the paddle mixer or a downward direction.

[0007]

Incidentally, earth and sand to be improved in soil quality have various modes in terms of their state and properties. For example, foreign substances such as rocks may be sieved in advance, and may be supplied under good processing conditions in which the particle size of the earth and sand are uniform, or earth and sand excavated by a hydraulic shovel or the like may be input as it is. . If the excavated soil is put into the earth and sand hopper as it is, soil chunks having irregular sizes are mixed. Further, as properties of the earth and sand, there are clay-like sticky ones and dry soils in which the degree of progress of weathering is remarkable and the water content is extremely low.

As described above, earth and sand having various conditions and properties are supplied to the mixing vessel together with the soil improving material. However, no matter what kind of earth and sand is supplied, the earth and sand are uniformly mixed and agitated by a paddle mixer or the like. It is necessary to efficiently produce a high-quality improved soil in which the earth and sand and the soil improvement material are uniformly mixed. For this purpose, it is necessary to control the supply of an appropriate amount of mixed material, particularly earth and sand, into the mixing vessel. For example, if the supply of the mixed material to the mixing container is too large, the paddle will be completely buried in the mixed material, and the stirring / mixing function of the paddle mixer will not be sufficiently exerted. It cannot be mixed uniformly. On the other hand, when the amount of the mixed material in the mixing container is too small, the processing efficiency is deteriorated.

In general, when the mixed material is stirred and mixed by the paddle mixer in the mixing vessel, it is most efficient to supply the paddle constituting the paddle mixer in such an amount that the paddle is about 80% buried in the mixed material. It is said that the soil can be improved and that the soil and soil improving material can be uniformly mixed. However, if a large amount of soil is included when the earth and sand are charged, even if the paddle is supplied in such an amount that the paddle is 80% buried, the earth inside the mixing container is collapsed by the stirring action of the rotation of the paddle mixer. The mixed material is less than 80% of the paddle height. In other words, whether or not the injected earth and sand contains the earth mass and the amount of the earth mass included have a very significant effect on the processing efficiency.

[0010] When clay is used as the soil and sand, sufficient stirring cannot be performed even if the mixed material is supplied at a level of 80% of the above-mentioned paddle. In other words, since the clay-based earth and sand adheres to the paddle, etc., the agitation resistance becomes extremely large.If the amount of earth and sand supplied to the mixing vessel is not limited, the rotational load on the rotating shaft becomes extremely large, and the smooth rotation of the paddle mixer will occur. Will be spoiled.

The present invention has been made in view of the above points, and an object of the present invention is to optimize the amount of earth and sand supplied in accordance with the state and properties of the earth and sand supplied to the mixing container. The purpose is to make it easy to adjust.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention relates to a mixing container having a supply portion for soil and soil improvement material at one end and a discharge portion for improved soil at the other end. A stirring / mixing means having blades attached thereto, and mixing and transporting the earth and sand and the soil improvement material from the supply section side to the discharge section side while mixing with the stirring / mixing means. A gate for restricting a cross-sectional area of a passage in the mixing container, at a position downstream of the earth and sand supply section in a conveying direction of the mixed material composed of the earth and sand and the soil improving material by means of stirring and mixing of the container; The feature is that a height position adjusting means for changing the area is provided.

Here, since the stirring and mixing means provided in the mixing vessel continuously improves the soil quality, the mixing and mixing means consisting of the soil and the soil improving material is not only stirred and mixed, but also from the supply unit side. It also exerts the function of transferring to the discharge section side. As a configuration of the stirring / mixing means,
At least a rotary shaft extending from the supply unit to the discharge unit is provided, and the rotary shaft is rotatably driven by a motor (a hydraulic motor or an electric motor). In order to transport the mixed material while stirring, a blade is provided on the rotating shaft, and the blade is formed in a spiral shape. The spiral of the blade may be continuous or intermittent. For example, a paddle mixer in which paddles are implanted at predetermined pitch intervals so as to form an intermittent spiral on the outer peripheral surface of the rotating shaft can be configured. Further, if the paddle is not fixedly provided on the rotating shaft but is detachably fastened using bolts or the like, the worn paddle can be replaced. A plurality of stirring / mixing means such as a paddle mixer are provided in the mixing vessel.
An even number such as a book is provided. In addition, the rotating shafts of the adjacent stirring / mixing means rotate in mutually opposite directions. In addition, if the rotation of each rotating shaft is independently performed, inconveniences such as variations in rotation speed may occur, so that one rotating shaft is driven to rotate, and the other rotating shafts It is desirable to configure so as to follow.

The mixing container is in the form of a long box having a predetermined depth and length, and is open at the top or provided with a lid at least partially. In order to supply a mixed material consisting of earth and sand and a soil improving material to this mixing container, a configuration in which a sand hopper and a soil improving material hopper are provided at one end side of the mixing container is used to control the supply amount of the mixed material. desirable. If foreign matter such as rock is contained in the supplied earth and sand, a sieve or the like is provided in the earth and sand hopper to separate the foreign matter. Either of the earth and sand hopper and the soil improving material hopper may be arranged on the upstream side, but it is reasonable to arrange the earth and sand hopper on the upstream side since the soil improving material is mixed with the earth and sand. In addition, the earth and sand hopper and the soil improvement material hopper may be directly opened in the mixing container, or a conveyor may be provided, and the earth and sand and the soil improvement material may be supplied from the earth and sand hopper and the soil improvement material hopper to the conveyor. It can also be sent from a conveyor to a mixing container.

Since the cross-sectional area of the passage of the mixing container by the gate is adjusted according to the shape and properties of the earth and sand supplied to the mixing container, the gate is arranged at least downstream of the earth and sand hopper. The gate may be located downstream or upstream of the soil improvement material hopper. When the gate is arranged upstream of the position of the soil improving material hopper, the position of the gate is adjusted in anticipation of the amount of the soil improving material to be added, and the passage sectional area of the mixing vessel is set. As an example of the gate, the gate is made of a metal plate or the like, and the gate plate is arranged so as to cross the rotation axis of the stirring / mixing means. In the case where the blade provided on the rotating shaft is constituted by a paddle, a portion where the gate plate is mounted is missing the paddle. When a continuous blade is provided, a cut or the like is formed in the blade to enter the gate. However, it is not desirable to form a cut or the like on the rotating shaft because the strength is reduced. Therefore, the gate plate is always located above the rotation axis.

The height adjusting means for adjusting the height position of the gate, such as a gate plate, changes the height of the gate at least two steps or more, or continuously changes the height position. To be configured. For example, when the height position of the gate is changed depending on whether or not the earth and sand supplied to the mixing container include an earth mass, the height of the gate may be changed in two steps. In this case, a cylinder is connected to the gate, and the gate is displaced up and down two steps (or a plurality of steps) by the cylinder. In the case where the height of the gate is changed in multiple stages or the height position is continuously changed, it is appropriate to use a motor as the driving means.
The motor may be directly connected to the gate to move the gate directly, but a rack-pinion mechanism, a cam mechanism and the like may be interposed.

As the soil improvement material, various materials can be used depending on the use of the improved soil to be produced. For example, when backfilling an excavated portion or when improving the ground, lime, cement, or a mixture of these with a desired additive is used. In addition, it can be used for various soil improvements, such as improving clay soil, modifying the ground to have a cushion, and further improving soil in agricultural lands. Soil improvement materials will be different.

Regardless of the type of soil improving material, the soil improving material is supplied to the mixing vessel from a soil improving material hopper or the like. To improve the quality of the improved soil, the mixing ratio of the soil and the soil improving material must be adjusted. It needs to be adjusted precisely. For this purpose, it is desirable that the soil improving material hopper be configured to always supply the soil improving material to the mixing container in a constant amount. On the other hand, as for the supply control of the earth and sand, the rotation speed of the stirring / mixing means may be controlled, or the earth and sand supply amount may be measured in advance. Also, the gate can be used as a means for controlling the supply amount of earth and sand.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. It goes without saying that the present invention is not construed as being limited to this embodiment.

First, FIG. 1 shows the overall configuration of the soil improvement system. In the figure, reference numeral 1 denotes a sediment accumulation site where soil to be improved is accumulated, 2 denotes a mixed material supply unit for supplying a mixed material composed of soil and soil improvement material, 3 denotes a soil improvement mechanism, 4 denotes a means for discharging the improved soil, Reference numeral 5 denotes an improved soil storage area where the improved soil is deposited. A hydraulic excavator 6 is located at the sediment collection site 1, and the hydraulic excavator 6 scoops up soil,
The mixture is supplied to the mixed material supply unit 2. On the other hand, the supply of the soil improvement material to the mixed material supply unit 2 is performed, for example, from a flexible container.

The mixed material supply unit 2 includes an earth and sand hopper 10,
It comprises a soil improvement material hopper 11 and a carry-in conveyor 12. Here, the loading conveyor 12 is provided in an inclined state, and the earth and sand supplied from the earth and sand hopper 10,
The soil improving material supplied from the soil improving material hopper 11 is conveyed obliquely upward. Accordingly, the earth and sand hopper 10 is located on the downstream side and the soil improving material hopper 11 is located on the upstream side in the direction of transport of the mixed material by the carry-in belt 12.

The earth and sand hopper 10 is formed of a substantially rectangular frame-shaped member. As is apparent from FIG. 13 preferably comprises a vibrating screen. In addition, the lower end of the earth and sand hopper 10 is a loading conveyor 1.
2 with a slight gap to the transport surface,
A carry-out opening 10a is formed on a wall surface on the upstream side in the carrying direction by the carry-in belt 12, and the amount of the earth and sand carried by the carry-in belt 12, that is, the amount in the height direction is regulated by the carry-out opening 10a. Is done.

As shown in FIG. 3, the soil improving material hopper 11 has a fixed supply section 15 connected to a lower portion of a storage section 14 formed of a cylindrical or box-shaped tank.
The storage unit 14 is provided with a cover 14a that can be opened and closed, and a predetermined amount of soil improvement material is supplied from a flexible container or the like. A communication hole 14b is provided on the bottom surface of the storage unit 14, and the soil improvement material flows into the fixed amount supply unit 15 through the communication hole 14b, and the soil improvement material is supplied from the fixed amount supply unit 15 by a fixed amount to the conveyer 12a. It is supplied to. As shown in FIG. 4, the fixed-quantity supply unit 15 includes a rotary feeder 1 that is driven by an electric motor (not shown) or the like between the arcuate wall surfaces 15a, 15a before and after the lower end is opened.
6, the opening at the lower end becomes the soil improvement material supply port 15b. The rotary feeder 16 is provided at a predetermined angle (in the illustrated case, 90 °
By forming the partition wall 16b in each case), the soil improving material storage portion S having a predetermined volume is formed between the adjacent partition walls 16b, 16b. Therefore, when the rotary feeder 16 rotates in the direction indicated by the arrow, the soil improving material in an amount corresponding to the volume of the soil improving material storage portion S formed between the partition walls 16b, 16b is rotated every quarter turn. Will be supplied. Therefore, by changing the rotation speed of the rotation shaft 16a, the supply amount of the soil improvement material is controlled.

The soil hopper 10 and the soil improving material hopper 11
In the position between the transfer belts 1 and 2, as shown in FIG.
Weighing means 17 for measuring the weight of earth and sand conveyed by
Is provided. The weighing means 17 includes a weighing roller 17 provided between a pair of rollers 18 provided so as to contact the lower surface of the belt 12 a constituting the carry-in conveyor 12.
and a swing bar 17b connected to the measuring roller 17a.
And a pusher 17c attached to the end of the swing bar 17b opposite to the side where the measuring roller 17a is connected. The pusher 17c is in contact with the load cell 19. Therefore, when the earth and sand is conveyed between the rollers 18 and 18 in the belt 12a, the belt 12a tends to bend downward due to the weight of the earth and sand at that position.
A force is applied to push a downward. As a result, a force acts in a direction in which the pushing portion 17c is displaced upward via the swing bar 17b, and this force is transmitted to the load cell 19. Therefore, the weight of the earth and sand conveyed by the carry-in conveyor 12 is measured based on the load acting on the load cell 19.

As described above, the amount of the soil improving material supplied from the quantitative supply section 15 of the soil improving material hopper 11 is adjusted based on the weight of the earth and sand conveyed on the carry-in conveyor 12 by the load cell 19. That is, the rotation speed of the rotary feeder 16 in the fixed quantity supply unit 15 is changed based on the signal from the load cell 19. As a result, according to the supply amount of the earth and sand, the earth and sand and the soil improvement material are supplied to the conveyor 12 so as to have a predetermined mixing ratio.

As described above, the earth and sand and the soil improvement material are transported by the carry-in conveyor 12, and the end of the carry-in conveyor 12 is connected to the soil improvement mechanism 3. The soil improvement mechanism 3 has a mixing container 20, as shown in FIGS. The mixing container 20
As is clear from FIG. 7, the container body 20a is formed by attaching a lid 20b for closing the upper end opening to a long box-shaped container body 20a having an open upper end, and the lid 20b is attached to the container body 20a with bolts or the like. It is desirable to fix detachably. A plurality of leg rods 21 are provided at the lower part of the container main body 20a, whereby the mixing tank 20 is installed at a predetermined height position. The mixing container 20 can be mounted on a traveling device such as a crawler type.

In the mixing container 20, the carry-in conveyor 1
This is for transferring the mixed material supplied from 2 while stirring and mixing. Therefore, as shown in FIG. 8, a mixing material supply opening 22 is formed in the lid 20a near the connection side end of the carry-in conveyor 12 in the mixing container 20, and a bottom surface on the other end side is formed in the mixing container 20. An improved soil discharge opening 23 is formed. Then, the mixed material supplied from the mixed material supply opening 22 is uniformly mixed while being transferred toward the improved soil discharge opening 23 while being stirred inside the mixing container 20, and the improved soil is generated. It is to be discharged from the improved soil discharge opening 23.

In order to perform the soil improvement processing, two paddle mixers 24 are provided in parallel in the mixing vessel 20. The paddle mixer 24 constitutes a stirring / mixing means for transferring the soil and the soil improvement material while stirring / mixing the paddle mixer 24. The paddle mixer 24 has a rotary shaft 25, and the rotary shaft 25 has a spiral A large number of paddles 26 made up of intermittent blades are arranged at a predetermined angle with respect to the center axis of the rotating shaft 25. Here, the paddle 26 is attached to a support rod 26a fixedly provided to the rotating shaft 25 such that the paddle body 26b is fixed with a bolt 26c. Thus, when the paddle body 26b is worn, it can be easily replaced.

In this embodiment, the paddle mixer 24
Are provided, but this paddle mixer 24
Is determined by the relationship between the height and the width of the mixing container 20, and the number is not limited to two. When the height of the mixing container 20 is increased, a large paddle having a large turning radius can be attached. Therefore, the number of the paddle mixers 24 may be small, but the height of the mixing container 20 is reduced and the width is increased. If you do
Since the turning radius of the paddle becomes small, the number of paddle mixers is increased. Therefore, the size of the mixing container 20 and the number of the paddle mixers 24 may be set based on the relationship between the width of the main body frame 2 and the height of the entire vehicle in order to provide a predetermined stirring efficiency. However, in order to smoothly and efficiently mix, stir, and transfer the earth and sand and the soil improving material in the mixing vessel 20, the number of the paddle mixers 24 is an even number, and the adjacent paddle mixers 24, 24 are in opposite directions. Must be able to rotate.

Both ends of the rotary shaft 25 of each paddle mixer 24 are rotatably supported by bearings 27, 27, and the front end of the rotary shaft 25 is connected to a housing of a driving unit 28 connected to the front end of the mixing container 20. Extending within.
A transmission gear 29 is connected to the tip of each rotating shaft 25, and both transmission gears 29, 29 mesh with each other. One of the transmission gears is connected to the output shaft of the hydraulic motor 30 or meshes with a drive gear connected to the output shaft. When the hydraulic motor 30 is driven to rotate, both rotations provided with the paddles 26 are provided. The shafts 25, 25 are simultaneously driven to rotate in opposite directions. Furthermore, mixing container 2
As shown in FIG. 9, the bottom of the mixing container 20 has a concave curved guide 32 along the rotation trajectory of the paddle 26. To prevent stagnation in the corners and the like.

Here, between the mixed material supply opening 22 and the improved soil discharge opening 23 of the mixing container 20, the portion of the rotary shaft 25 of the paddle mixer 24 on which the paddle 26 is mounted is disposed over the entire length thereof. Are located. Both ends of the rotating shaft 25 are rotatably supported by bearings 27, and the mounting portions of these bearings 27 are located forward of the mixed material supply opening 22 and rearward of the improved soil discharge opening 23. As a result, the earth and sand and the soil improvement material supplied from the mixed material supply opening 22 are mixed smoothly and reliably, and are transported at a constant speed without stagnation to the improved soil discharge opening 23.

A gate plate 33 is provided in the mixing container 20 at a position close to the mixed material supply opening 23 as a gate for limiting the cross-sectional area of the passage therein. The gate plate 33 regulates the cross-sectional area of the passage when the mixed material introduced into the mixing container 20 is transferred, and adjusts the transfer amount. The gate plate 33 is made of, for example, a metal plate piece, and is installed so as to cross the paddle mixer 24 at a position near the mixed material supply opening 23. Therefore, the paddle 26 is missing or partly cut away from the paddle mixer 24 where the gate plate 33 is located. The gate plate 33 needs to have a predetermined thickness in order to maintain a sufficient strength. However, it is desirable to shorten the length of the paddle 26 in the rotary shaft 25 by forming the gate plate 33 as thin as possible. .

Guide rails 34 for guiding the gate plate 33 are fixedly provided on both side walls of the container body 20a of the mixing container 20, and both ends of the gate plate 33 are inserted through these guide rails 34, 34. ing. Therefore, the gate plate 33 can be moved up and down along the guide rails 34. By changing the height position of the gate plate 33, the passage cross-sectional area of the mixed material in the mixing container 20 changes. The transfer amount is adjusted. In order to move the gate plate 33 up and down, a height position adjusting means is connected to the gate plate 33. Here, as the height position adjusting means, the mixing container 20 is used.
A hydraulic cylinder 36 attached to a support member 35 provided on the outer surface of the container body 20a of the container body 20 causes the gate plate 33 to move in a lowered position shown by a solid line in FIG. It can be displaced to two positions with the raised position shown. Then, at the lowered position indicated by the solid line in FIG. 9, approximately 20% of the upper part of the rotation trajectory of the paddle 26 in the paddle mixer 24 is covered by the gate plate 33. As a result, the transfer amount of the mixed material in the mixing container 20 is limited to a position lower than the top of the paddle 26 by about 20%. Further, at the ascending position indicated by the imaginary line in the figure, the lower end of the gate plate 33 is located at substantially the same position as the upper end of the rotation trajectory of the paddle 26, so that the transfer amount of the mixed material in the mixing vessel 20 is It increases by that much.

With the above configuration, the mixed material is uniformly mixed in the mixing vessel 20 by the action of the paddle mixer 24, and the improved soil generated by reaching the improved soil discharge opening 23 is free of its own weight from the improved soil discharge opening 23. It is discharged so as to drop onto the unloading conveyor 40 constituting the discharging means 4 by the action. Here, since the improved soil discharge opening 23 is located below the mixing container 20, the unloading conveyor 4
0 is located below the improved soil discharge opening 23. If the unloading conveyor 40 extends straight as it is, the improved soil cannot be deposited at a high level. Therefore, by extending the unloading conveyor 40 diagonally upward, the improved soil is deposited on the improved soil storage site 5 from a predetermined height position. I have.

Here, for example, when lime is used as the soil improvement material, the improved soil generated by the soil improvement mechanism 3 has a aggregate structure. Then, in order to make the particle diameter of the improved soil uniform, the improved soil is supplied from the unloading conveyor 40 to the vibrating screen 41 so as to be dropped. As a result, based on the mesh size of the sieve 41, the improved soil having a predetermined particle size or less passes through the vibrating sieve 41 and is supplied to the transfer conveyor. Then, the improved soil is again conveyed obliquely upward by the transfer conveyor 42 and deposited at a predetermined position. Further, the improved soil having a large particle size that has not passed through the vibrating sieve 41 moves on the vibrating sieve 41 and drops from one end thereof.

In performing soil improvement using the soil improvement system configured as described above, the height position of the gate plate 33 is changed according to the state and properties of the earth and sand accumulated in the earth and sand accumulation site 1. Thus, when the sediment accumulated in the sediment accumulation site 1 contains little or no earth mass and has a small particle size, the gate plate 33 is set to the lowered position, and a large amount of large earth mass is contained. In this case, the gate plate 33 is set to the raised position. The vertical movement of the gate plate 33 can be easily performed by operating the hydraulic cylinder 36.

Then, the excavator 6 is operated to scoop up the earth and sand from the earth and sand accumulation site 1 and throw the earth and sand into the earth and sand hopper 10 constituting the mixed material supply unit 2. The earth and sand supplied to the earth and sand hopper 10 is transferred to the carry-in conveyor 12, and the soil improving material supplied from the soil improving material hopper 11 is added thereto. Here, on the loading conveyor 12,
Since the weight of the earth and sand is measured by the weighing means 17,
By adjusting the supply amount of the soil improving material from the rotary feeder 16 of the soil improving material hopper 11 based on the signal from the measuring means 17, the mixing ratio of the mixed material can be controlled to be constant.

The carry-in conveyor 12 is connected to a mixing container 20 constituting the soil improvement mechanism 3, and the mixed material is supplied from the carry-in conveyor 12 into the mixing container 20 through the mixed material supply opening 22. In the mixing container 20, the paddle mixer 24 operates, and therefore, the mixed material supplied into the mixing container 20 is stirred and mixed.
While being mixed, it is transferred toward the improved soil discharge opening 23 side. A gate plate 33 is provided near the mixed material supply opening 22, and the gate plate 33 narrows the cross-sectional area of the passage through which the mixed material moves. Here, since the gate plate 33 covers approximately 20% of the upper part of the entire rotation trajectory of the paddle 26 constituting the paddle mixer 24, the mixed material passing through the position of the gate plate 33 is limited accordingly. You.

The gate plate 33 limits the amount of the mixed material to be stirred and mixed in the mixing vessel 20 to about 80% of the height up to the top of the paddle 26, thereby improving the soil and soil quality by the paddle mixer 24. The function of stirring and mixing with the material is fully exhibited, and they are completely and uniformly mixed, and there is no possibility that uneven mixing or the like will occur. When the soil reaches the position of the improved soil discharge opening 23, the improved soil in which the earth and sand and the soil improvement material are uniformly mixed is generated, and the discharging means 4 is formed from the improved soil discharge opening 23 by the action of its own weight. Falling on the carry-out conveyor 40 to be carried out.
A vibrating screen 41 is provided at the tip of the unloading conveyor 40.
, The improved soil is sieved by the vibrating sieve 41, and those having a predetermined particle size or less are transferred to the transfer conveyor 42.
And is deposited on the non-defective improved soil yard in the improved soil yard 5. In addition, the improved soil that has not passed through the vibrating sieve 41 is also deposited on a predetermined storage place.

On the other hand, when the sediment accumulated in the sediment accumulation site 1 contains a large amount of earth mass, the hydraulic cylinder 3
6 is operated to raise the gate plate 33. Here, the earthen lump is different from rock or the like, and keeps the state of lump unless extraordinary external force is applied. However, the lump is supplied into the mixing vessel 20 and is divided into small pieces when it is stirred by the paddle mixer 24. It completely collapses. When such a mass of soil is contained in a large amount, the paddle mixer 24 operates to reduce the bulk when the mass of soil is collapsed.
The passage of the mixed material limited by the gate plate 33 is widened. More specifically, the passage amount of the mixed material is increased by about 20% as compared with the case where the above-mentioned clay lumps are not included in the passage up to the full height of the paddle 26. As a result, a decrease in treatment efficiency when soil quality of the soil containing the earth mass is improved is suppressed. In addition, the mixed material is agitated and mixed by the paddle mixer 24, and proceeds to some extent in the mixing vessel 20, and its bulk is reduced. As a result, the mixed material is uniformly mixed by the subsequent stirring and mixing, which may cause uneven mixing. Absent.

Here, for example, if the paddle 26 is provided at every 90 ° in the paddle mixer 24, four pitches constitute one pitch. And the clay is paddle mixer 24
When the paddle mixer 24 advances by about two pitches while the volume is gradually reduced while being divided into small pieces, the clay is completely collapsed, and thereafter the volume of the mixed material becomes constant. In addition, the sediment and the soil improvement material exert a stirring / mixing action during the two pitches of the transportation,
Even if the mixing container 20 is not made too long, it is possible to generate a high-quality improved soil in which the earth and sand and the soil improvement material are uniformly stirred and mixed. As a result, it is possible to suppress the processing efficiency of the soil improvement mechanism 3 from fluctuating due to the state of the earth and sand.

In the carry-in conveyor 12, the weight of the earth and sand is measured by the measuring means 17. In addition, in the earth and sand hopper 10, the unloading opening 1
The earth and sand is conveyed through Oa, and the bulk of the conveyed earth and sand becomes substantially constant. Therefore, depending on the measuring means 17, the bulk density of the earth and sand conveyed on the carry-in conveyor 12 can be measured. That is, the presence / absence and amount of the earth mass are measured by the measuring means 17. Therefore, if the hydraulic cylinder 36 is operated based on the signal from the measuring means 17 and the gate plate 33 is moved up and down as appropriate, regardless of the state of the earth and sand, the earth and sand and the soil improving material can be evenly distributed. Mixed high quality improved soil can be produced very efficiently.

As described above, the operation of the paddle mixer 24 may be hindered depending on the nature of the earth and sand. For example, when clay soil is supplied to the mixing container 20, the soil is attached to the paddle 26 and the like, and the resistance to the rotation of the rotary shaft 25 is significantly increased, and the rotation speed is reduced. Will decrease. Therefore, in the case of clayey earth and sand, it is desirable to further restrict the transfer amount in the mixing container 20. For this purpose, the gate plate 33 is moved to a position lower than 80% of the height of the paddle 26, for example, the paddle mixer 24.
Is configured to be lowered to a position near the rotating shaft 25 in the above.

That is, the gate plate 33 is configured to be able to move up and down in three stages. For this purpose, a two-stage cylinder or the like can be used. For example, the gate plate 33 can be configured as shown in FIG. The plate 33 can be raised and lowered in three steps. As shown in FIG.
An overhang portion 33a is provided at the upper part of
0 is attached. The guide rail 5 is provided on the lid 20b.
1 and a lifting drive block 52 is mounted on the guide rail 51. The lifting drive block 52 includes a rack 52a and a three-stage cam portion 52b.
The cam follower 50 is rotatable. Further, a pinion 54 connected to the output shaft of the motor 53 is provided on the rack 52a so as to mesh therewith.

With the above configuration, when processing earth and sand containing a large amount of earth mass, the cam follower 50 is engaged with the uppermost step of the cam portion 52b to hold the gate plate 33 at the raised position. Thus, the amount of the mixed material passing through the position of the gate plate 33 is increased. Further, when processing ordinary earth and sand, the cam follower 50 is engaged with the middle step of the cam portion 52b,
The gate plate 33 is held at an intermediate height position. Further, when processing clayey soil, the cam follower 50 is engaged with the lowermost step of the cam portion 52b in order to hold the gate plate 33 at a lower position, and the amount of the mixed material passing through the gate plate 33 is reduced. Is minimized. This makes it possible to perform soil improvement processing under optimum conditions according to the state and properties of the soil to be processed.

Further, in order to configure the gate plate 33 so as to be continuously changed over the entire range of the elevating stroke, a motor 60 and a circular cam 61 are used as shown in FIG. The driving gear 6 is connected to the motor 60.
2, and a driven gear 63 is connected to the circular cam 61. An elevating plate 64 is connected to the gate plate 33, and the elevating plate 64 is configured to be vertically guided by a slide guide 65 erected on the lid 20b of the mixing container 20. Further, a cam follower 66 is connected to the elevating plate 64 and provided.
6 is configured to roll along the outer peripheral surface of the circular cam 61.

With this configuration, the mixing container 2
The mixed material can be adjusted so as to have an optimal transfer amount in accordance with the nature and condition of the earth and sand to be charged to zero. FIG.
By using the mixing container 70 described in (1), the mixing ratio between the earth and sand and the soil improving material can be accurately controlled. In the configuration shown in the figure, a earth and sand hopper 72 is connected to the most upstream side in the direction in which the mixed material is transferred by the paddle mixer 71 provided in the mixing container 70, and the earth and sand hopper 7 is provided.
2 directly supplies the earth and sand to the mixing container 70. Further, the gate plate 3 can be continuously raised and lowered from the disposition position of the earth and sand hopper 72 to a position on the downstream side by approximately two pitches of the paddle.
3 is provided. Further, a soil improving material hopper 73 for directly supplying the soil improving material to the mixing vessel 70 is provided at a position downstream of the gate plate 33.

The earth and sand is supplied into the mixing container 70, and proceeds from the disposition position of the earth and sand hopper 72 by approximately two pitches of the paddle. The earth mass is collapsed by the stirring of the paddle mixer 71, and the state is stabilized. Gate plate 33
And the gate plate 33 is connected to the motor 60 shown in FIG.
When the earth and sand pass through the gate plate 33, the height is always constant by adjusting the height to an arbitrary height position by the action of the circular cam 61. Therefore, even if the amount of the soil improving material supplied from the soil improving material hopper 73 is constant,
By adjusting the height position of the gate plate 33, the mixing ratio between the earth and sand and the soil improvement material can be accurately controlled.

[0049]

Since the present invention is constructed as described above, it is possible to easily adjust the supply amount of the earth and sand so as to be optimal according to the state and properties of the earth and sand supplied to the mixing container. Play.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a soil improvement system according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a sediment hopper attached to the soil improvement system of FIG.

FIG. 3 is a sectional view of a soil improvement material hopper mounted on the soil improvement system of FIG. 1;

FIG. 4 is an explanatory diagram of a configuration of a fixed-quantity supply unit included in the earth and sand hopper of FIG. 3;

FIG. 5 is an explanatory diagram of a configuration of a lightweight means for reducing the amount of earth and sand transported by a carry-in conveyor in the soil improvement system of FIG. 1;

FIG. 6 is a plan view of a mixing container used in the soil improvement system of FIG. 1;

FIG. 7 is a right side view of FIG.

FIG. 8 is a sectional view taken along the line AA of FIG. 6;

FIG. 9 is a sectional view taken along line BB of FIG. 6;

FIG. 10 is a configuration diagram of a gate height position adjusting unit according to another embodiment of the present invention.

FIG. 11 is a configuration diagram of a gate height position adjusting unit showing still another embodiment of the present invention.

12 is an explanatory diagram of a main configuration of a soil improvement system in a case where the height adjusting unit of FIG. 11 is used.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Sediment collection point 2 Mixed material supply part 3 Soil quality improvement mechanism 4 Discharge means 5 Improved soil storage place 10,72
Earth and sand hopper 11,73 Soil improving material hopper 17 Measuring means 20,70 Mixing container 22 Mixed material supply opening 23 Improved soil discharge opening 24,71
Paddle mixer 25 Rotary shaft 26 Paddle 30 Hydraulic motor 33 Gate plate 34 Guide rail 36 Hydraulic cylinder 50 Cam follower 52 Drive block 52a Rack 52b Cam 57, 60 Motor 61 Circular cam

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hisagi Hashimoto 650, Kandate-cho, Tsuchiura-shi, Ibaraki Pref.Hitachi Construction Machinery Co., Ltd. (72) Inventor Fujio Sato 650, Kandate-cho, Tsuchiura-shi, Ibaraki F-term (reference) 2D040 AB07 AC04 AC05 CA03 CB01 CD07 EB04 4G078 AB20 BA01 BA07 DA01

Claims (7)

[Claims] An agitating / mixing means having a blade attached to a rotating shaft is installed in a mixing vessel having a supply portion for soil and soil improvement material at one end and a discharge portion for improved soil at the other end. In a configuration in which the earth and sand and the soil improvement material are transferred from the supply unit side to the discharge unit side while being mixed by the mixing means, the conveying direction of the mixed material composed of the sand and the soil improvement material by the mixing and stirring means of the mixing container. A gate that restricts the cross-sectional area of the passage in the mixing vessel, and a height position adjusting means that changes the cross-sectional area of the passage formed by the gate, at a position downstream of the earth and sand supply unit. To improve soil quality. 2. The paddle mixer according to claim 1, wherein the blades constituting the stirring / mixing means are paddle mixers having paddles arranged in an intermittent spiral shape at a predetermined pitch interval on an outer peripheral surface of the rotating shaft. Soil improvement equipment. 3. The mixing container is formed in a long box shape, and the supply portion of the earth and sand and the soil improving material is constituted by a soil and sand hopper and a soil improving material hopper, and the earth and sand hopper is formed of the paddle mixer from the soil improving material hopper. 3. The soil improvement device according to claim 2, wherein the soil improvement device is arranged on an upstream side. 4. The soil improvement apparatus according to claim 3, wherein said height position adjusting means is configured to change the height position of said gate stepwise by at least two steps. 5. The soil improvement apparatus according to claim 3, wherein said height position adjusting means is configured to continuously change the height position of said gate. 6. The gate according to claim 3, wherein said gate is disposed downstream of said soil improvement material hopper.
The soil improvement device as described. 7. The gate is disposed between the earth and sand hopper and the soil improving material hopper, and the soil improving material hopper is configured to constantly supply the soil improving material to the mixing container at a constant rate. 4. The soil quality improvement device according to claim 3, wherein the height position of the gate is continuously changed by the height position adjusting means according to a mixing ratio of the soil and the soil quality improvement material.