JPH10121517A - Method of recycling excavated soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily improve excavated soil in various construction sites, by controlling the feed quantity of a soil stabilizer according to the introduced quantity of excavated soil and constituting the mixture of the excavated soil and the soil stabilizer with the inlet thereof, the main body part transferring the mixture, an agitating rotor fitted to the main body part at nearly right angles, and the outlet of the mixture. SOLUTION: Swells 23 are formed in the inside of a cylindrical main body part 22. A number of rotary blades 25 are provided in three sets of agitating rotors 24 respectively. The most left hand agitating rotor 24 rotates anticlockwise and other rotors 24 rotate alternately and reversely. The inlet 26 is formed at the upper part of the left agitating rotor 24 and the discharge outlet 27 is formed at the lower part of the right agitating rotor 24. When soil and a solidifying agent are put in the inlet 26, the mixture is transfered downward by the first agitating rotor 24 and then transferred rearward. And then the mixture is scraped up near the following agitating rotor 24 and a part thereof is returned to the forward side and mixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for reclaiming excavated soil.

[0002]

2. Description of the Related Art An excavated soil regenerating method is a method for improving soil when excavated soil is used as a foundation or ground. Generally, cement-based solidifying agent is added,
It is performed by stirring and mixing.

Conventionally, when building or constructing a road on soft ground, the soft soil is removed and discarded, that is, used for land reclamation. It is being done. However, the soil to be discarded as much as possible due to the difficulty of disposing of the soil due to the decrease of landfills, and the fact that strong and excellent soil is decreasing due to environmental problems and transportation costs. It has been desired to reduce the amount of. Also, from the viewpoint of effective use of resources, there is a demand that usable resources should be used as much as possible.

[0004] It is therefore desirable to improve soft soils so that they can be used again as ground at that location or elsewhere needed. Therefore, the excavated soil is put in a container, a solidifying material is added to the excavated soil, mixed (the soil quality is improved by the solidified material), taken out, and backfilled. Therefore, what is necessary is just a container and a stirrer. However, in this case, continuous work cannot be performed, and it is of a batch type and is inefficient. Therefore, a continuous type has recently appeared.

[0005] This is a device in which a stirring and mixing device is provided in a cylindrical or half-split body, excavated soil and solidified material are introduced from one end or the upper part, mixed by the stirring and mixing device, and discharged from the other. It is. The stirring and mixing device used was a rotary blade having an axis in the same direction as the traveling direction of the soil. That is, using two shafts such as an electric fan with a large number of blades arranged coaxially, mixing while transporting the soil backward, or two shafts with continuous spiral blades like a screw conveyor It was performed in close proximity. This is because soil can be sent while mixing and stirring, so that continuous operation is possible.

[0006]

As described above, in the conventional continuous mixers, the rotating shafts of the rotating blades or the screws are all parallel to the feeding direction of the soil. This was the same as a screw conveyor and a fan, and was common sense. Of course, with this alone, even if it can be transported backward, the solidified material and the soil can not be mixed, so the same thing is placed close and parallel,
Therefore, a stirring effect is provided. This method is the same for so-called kneaders (kneading machines) and the like.

[0007] In this system, there is no problem if the mixture has an appropriate particle size and an appropriate viscosity. However, the soil contains stones of various sizes, which may bite between the parallel two-axis wings. In order to increase mixing efficiency, the two-axis wings must be close (otherwise,
(It becomes like a simple screw conveyor and is not mixed), and the frequency of biting becomes higher.

In addition, this type of apparatus does not have the function of crushing stones or hard solidified soil, etc., but only cuts at the end of its wing at best. Therefore, if a stone or the like is used, the solidified material is hardly mixed into the solidified soil.

Therefore, there is a long-awaited need in the art for a method that does not have the above-mentioned disadvantages and that can easily improve excavated soil at various sites.

[0010]

In view of the above situation, the present inventors have made intensive studies and completed the method of the present invention. A method for improving soil quality by mixing a modifying material, comprising detecting an introduction amount of the excavated soil, controlling an input amount of the soil modifying material according to the amount, and excavating soil and the soil modifying material. The mixing has an inlet for introducing excavated soil and soil modifying material, a main body portion in which the mixture is mixed and transferred, a rotation axis provided in the main body portion and substantially perpendicular to a transfer direction of the mixture, and A mixer comprising a plurality of stirring rotors having a number of rotating blades attached to a rotating shaft, and a discharge port for discharging the mixture from a main body, wherein the plurality of stirring rotors are provided on different rotating shafts, respectively. The point is to perform.

The excavated soil referred to here is a soil whose soil quality is to be improved. The excavated soil may be not only excavated soil, but also any soil such as dredged soil or soil used for other purposes. , Its origin does not matter.

[0012] The soil modifying material refers to a solidified material currently used or a very good soil having an excellent soil quality. In both cases, the soil is mixed with the soil to be modified and becomes a soil that meets the standards as a whole. The solidifying material may be one used for ordinary soil improvement, and need not be special. In short, anything that improves soil can be used. Of course, it depends on the properties to be improved. However, since the strength is usually improved, many cement-based materials are used. In the method of the present invention, as the soil modifying material, only a solidifying material, only good-quality soil, or both may be used.

The entire system of the method of the present invention will be described. Basically, the excavated soil is charged from the excavated soil input port, and at the same time, good-quality soil and / or solidified material is input from the input port. Here, they are sequentially sent to a mixer where they are mixed to improve the soil quality and are discharged from a predetermined outlet. Since the discharged soil has been improved for ground use, it may be back-filled at the excavated site or used at another site. Here, the method of the present invention has a great feature in a mixer used in this system and a transport device for transporting excavated soil and high quality soil.

The structure of the mixer used in the method of the present invention will be described. The inlet in the present mixer is an opening for introducing excavated soil and soil modifying material into the main body, and a type in which a mixture is introduced from one place or a type in which soil and modifying material are separately introduced. Good. This is just an opening and need not be special. The position of the inlet is preferably on the upstream side of the stirring rotor described later, but may be on the stirring rotor.

The main body is a portion for mixing the soil modifying material and the soil, and also for transferring the mixture for continuous operation. It consists essentially of a simple container and a stirring rotor. The shape of the container itself is cylindrical, rectangular,
Others are fine.

The stirring rotor is an essential part of the mixer. In this case, a rotary blade having a large number of widths is attached to a rotary shaft. The rotary blade here is not necessarily curved like a blade of an electric fan, but may be substantially planar. This is a completely different point from the conventional rotor. This rotary blade has a certain thickness (about several millimeters to several centimeters), and is a method in which the soil is kicked backward by the thickness. Therefore, the rotation axis of the rotary blade is provided at right angles to the soil transfer direction.

At least two stirring rotors are required. If there are two or more, any number is theoretically possible. In experiments conducted by the inventors, in the case of two stirring rotors, the rotation direction may be either direction. That is, the stirring rotor may be rotated in the opposite direction or in the same rotation direction. However, the upstream agitating rotor was in the direction of sending the soil backward below the rotor, and the downstream rotor rotated in the opposite direction.

Further, in the present mixer, the plane including the plurality of stirring rotors is all horizontal or at 45 ° from the horizontal.
Within is good. In addition, this plane is arranged so as to be substantially parallel to the transport direction of the mixture. This is for transferring and mixing the mixture of the excavated soil and the soil modifying material at a horizontal angle or at an angle within 45 ° from the horizontal. For example, a method in which the mixture is dropped from above by gravity and a mixing blade is provided in the middle of the drop may be considered, but this point is fundamentally different from this. In the present mixer, the mixture is transferred (advanced from the apparatus toward the discharge port) by the stirring rotor, and is not dropped.

FIG. 7 is a conceptual diagram of the drop mixer. FIG. 7 (a) has one stirring rotor, which is completely different from the mixer used in the present invention, which requires a plurality of stirring rotors. FIG. 7B shows the stirring rotors arranged vertically. This differs from the present device where the plane containing the agitating rotors is vertical and horizontal or within 45 °. Finally, FIG. 7 (c) shows that the plane including the stirring rotor is horizontal, but the plane is orthogonal to the mixture transfer direction, and the rotor plane as in the present mixer is almost parallel to the transfer direction. And different.

In short, these apparatuses are different from the present mixer in that the mixture is dropped. This mixer is new in that the mixture is transferred by a stirring rotor. In particular, it is novel that a plurality of agitation rotors can be transported backward despite their counter rotation, and cannot be easily inferred from conventional ones.

In the present mixer, in practice, it is preferable that all of the plurality of stirring rotors are provided on the same plane, and all of them are parallel to the bottom surface of the main body (not the bottom surface but the transfer bottom surface). Then, the device is installed horizontally. With this configuration, the bottom surface of the main body and all of the plurality of stirring rotors are horizontal, and the direction in which the mixture is transferred is substantially parallel to the plane including the stirring rotor. However, as will be described later, the whole body can be freely inclined to some extent depending on the properties of the mixture.

Although the stirring rotor of the present mixer is as described above, an additional stirring rotor may be provided. For example, by additionally providing near the inlet and near the outlet, additionally providing above or below the plurality of stirring rotors of the present mixer, providing in the upper and lower gaps between the plurality of rotors of the present mixer, and the like. is there. That is, even if a stirring rotor or the like is additionally provided in the apparatus having the stirring rotor constituting the present apparatus, it is within the scope of the right. In short, the present mixer simply needs to have at least the agitating rotor described in the claims, and may or may not have other components.

A large number of rotary blades are mounted on the rotary shaft while changing their positions. This is because if they are all at the same position, they will be like a single plate and the mixing efficiency will be poor. The position itself may be completely random or may vary to some extent regularly.

The rotary blade may be a simple steel plate as long as it has a certain thickness. However, a hard material may be separately attached to the tip end portion to provide strength. Also, the shape may be triangular, rectangular, or the like. It is also preferable to reinforce the base so as not to break or to make it thicker. The angle of attachment of the rotary blade may be in the radial direction of rotation or may have a slight angle with the radial direction.

The outlet is a mere discharge opening as opposed to the inlet. The position is also downstream of the last stirring rotor,
It may be below the rotor.

In the present mixing apparatus, the rotation speed and the rotation direction may be appropriately adjusted depending on the particle size and viscosity of the soil. However, the entire body may be inclined due to the problem of the soil discharge speed. For example, if the material is highly viscous and difficult to transfer, it is preferable to increase the transfer efficiency by lowering the discharge port side, and conversely, to increase the mixing efficiency by slightly increasing the discharge port side in the case of sand. The inclination can be easily achieved with a normal hydraulic jack or the like. However, the inclination angle is preferably within 30 ° from the horizontal plane. This is because, if the inclination is further increased, the mixing efficiency of the mixture becomes worse. However, if it is within 45 °, the efficiency is reduced but it is possible. If the angle exceeds 45 °, the mixture proceeds like a drop, and the mixing ratio is extremely reduced.

The mixing apparatus is most efficiently used in a place to be excavated. Therefore, it can be transported by a trailer or the like, but may be a self-propelled type, that is, provided on an upper part of a truck or the like.

Next, the transfer device used in the present invention will be described. The hopper in the present transport device is a portion for temporarily storing the transported object, and a transport plate described later sends out a substantially constant amount of the transported object. The purpose of the tank is to absorb fluctuations in volume. The upper part is a mere opening, and the lower part is opened so as to drop an object to be conveyed to an area pressed and conveyed by a conveying plate.

The bottom plate is a member on which a conveyed object (a viscous material or the like) slides and moves, and the belt itself moves and conveys the conveyed object in a conventional belt conveyor. There is a decisive difference from the past, in that the substrate on which the object is placed does not move. This bottom plate is made of metal, plastic or the like, and need not be special. The bottom plate may exist only in a substantially straight portion or in a portion where the moving frame descends. Further, a wall surface may be provided on a side surface parallel to the traveling direction.

The moving frame rotates and moves around the bottom plate in the vertical direction, and is similar to the periphery of a chain conveyor. This may be a ladder shape, a double ladder shape, or a wall surface (unnecessary if provided on the bottom plate) in the left-right direction. Basically, it is only necessary that the conveyed object can be rotated and moved without preventing the object from dropping from above to the bottom plate.

The transport plate transports the transported object by moving the transport plate. The transport plate is fixed to the moving frame and presses and transports the transported object in the moving direction according to the movement of the movable frame. This is just a plate and need not be specially shaped. This is fixed at a predetermined interval substantially perpendicular to the traveling direction of the moving frame.

Further, a tunnel having a length equal to or longer than the fixed interval of the transport plate may be provided at a portion where the transport plate enters and exits below the hopper. This is to prevent the object to be conveyed from the portion where the conveying plate exits from the hopper and from the portion where it enters when the object to be conveyed has a relatively large flow rate, and to prevent overflow from occurring until the next object to be conveyed. is there.

As another configuration of the present apparatus, the side wall of the hopper may be vibrated when the transferred object is difficult to drop downward from the hopper. For example, it is caused to vibrate by a motor. Further, an inclined baffle may be provided inside the hopper to reduce a shock when the transported object is thrown into the hopper from above.

Further, a rubber plate may be provided at the bottom of the transport plate so as to prevent stones or the like from being caught between the bottom plate and the transport plate, or a pebble shield such as a front portion of a train may be provided.

Further, it is also possible to provide a wall surface at the falling portion of the transported object so that the transported object can be dropped to a predetermined position without scattering around.

[0035]

FIG. 1 is an overall layout diagram showing an example of a system for implementing a method of the present invention. The mixer 1 is located at the center, and the loading port 2 is connected to the outlets of the transport devices 5 and 6 for transporting the excavated soil (defective soil) 3 and the high quality soil 4. Hoppers 7 and 8 are provided on the other end sides of the respective transport devices 5 and 6. Further, a solidified material charging machine 9 is provided above the mixer 1. This is because the amount of the solidifying material is small relative to the soil and the powder is easy to handle. Belt conveyor 10 also on the discharge side of mixer 1
Is provided, and the improved soil 11 is placed at a predetermined position.
It is also preferable to provide an operation room 12 for controlling the whole. A generator 13 serving as a power supply for the motor is also provided in proximity. FIG. 2 is a schematic side view of FIG. 1, in which excavated soil, high-quality soil, and solidified material are introduced from above and mixed, and are placed as improved soil.

FIG. 3 is a sectional view schematically showing the excavated soil regenerating apparatus 21. The main body 22 has a cylindrical shape, but has a raised portion 23 inside. In this example, three stirring rotors 24 are provided, each of which has a large number of rotating blades 25.
(Only one is shown here). In the example of this figure, the leftmost stirring rotor rotates counterclockwise.
The other stirring rotors alternately rotate reversely. The inlet 26 is provided above the left rotor, and the outlet 27 is provided below the right rotor. In this example, the main body is designed so that the rotation volume and the main body volume of the stirring rotor are substantially the same. In this example, the plane including the plurality of stirring rotors is parallel to the bottom surface of the main body, and both are horizontal because the main body is substantially horizontal.

In this example, when the mixture of soil and solidified material is introduced through the inlet 26, the mixture is transported downward and backward by the first stirring rotor. Then, when it comes to the vicinity of the next stirring rotor, it is stirred upward and a part thereof is mixed while returning to the front. At this time, the mixture does not completely follow the rotation of the stirring rotor, but a part of the mixture collides with a wall surface, and a part of the mixture falls and moves randomly. In this example, the main body is placed horizontally, but the outlet side is slightly raised to improve the mixing, and the outlet side is lowered to increase the transfer speed. The overall direction of transport of the mixture is parallel to the plane containing the three stirring rotors.

FIG. 4 is a conceptual perspective view showing an example of the stirring rotor of the present regeneration apparatus. It can be seen that the rotary blades 25 are randomly attached to the rotary shaft 28. However, in this figure, the thickness of the rotary blade 25 is ignored, and the distance between the rotary blades is greatly exaggerated. As described above, the attachment positions of the rotary blades 25, that is, the mutual positional relations, may be not random but may be spiral or partially regular. Further, in this figure, one rotary blade exists on the same plane, but a plurality of rotary blades may be provided.

FIG. 5 is a schematic perspective view showing an example of the present conveying device 31. The bottom plate 32 is of a fixed type, is curved downward at a distal end portion, and is interrupted at a distal end portion. The moving frame 33 is fixed to a roller 34 of a conveyor.
Low plate shape. The transport plate 35 is attached to the moving frame 33 at a predetermined interval, and moves together with the moving frame 33. The roller 34 is driven by a rotary drive (not shown) like a normal roller conveyor. Also,
The left and right side walls 36 at the lower part of the hopper are located above the movable frame 33. Although the transported object is not shown in this figure, the transported object located at the front of the transport plate 35 is pushed forward as the transport plate moves. Then, when it comes to the forefront, the bottom plate disappears and the side wall disappears, so that only the front and rear transport plates 33 and the moving frame exist around the transported object and fall. With this configuration, even clay can be dropped to a predetermined position.

In the example shown in FIG. 5, the bottom plate is provided only in the upper half, but may be provided in the entire periphery. In this case, although the transportability of the transported object is inferior, the bottom plate does not move in the same manner as the transported object, so that the transported object falls down very easily as compared with a conventional bucket conveyor or the like.

In the example of FIG. 5, there is a difference between the height of the moving frame 33 and the height of the transport plate 35. However, the height may be the same if the structure of the conveyor permits. Even if the transport amount is small or even if the side wall of the movable frame body is enlarged, it is sufficient if it can easily go around. Further, the moving frame may not have any portion such as a side wall, and may be constituted only by a chain and a roller.

FIG. 6 shows an example in which tunnels 38 are provided at the outlets before and after the hopper 37 (however, the rear portion is not shown). A tunnel 38 in which the left, right, up, and down are sealed forward from the outlet of the hopper 37 is provided. The length of the tunnel 38 is longer than the fixed interval of the transport plate 35. This tunnel 3
If there is no 8, the transported object overflows from the hopper outlet between the transport plates. Carrier plate 3
5 is longer than the interval of 5
8, there is always at least one transport plate, and the overflow is stopped there. The transport amount of the transported object is defined by the entrance of the tunnel.

[0043]

The method of the present invention has the following advantages. In the method of the present invention, since the mixer is special,
The rotating blades are not damaged by stones or the like, the device does not stop, and the main body is not clogged. Since the device is simple, it can be easily moved and assembled, and can be applied to any site. Since the transfer of the mixture is not by dropping, the mixing efficiency is very good.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing the entire system of the method of the present invention.

FIG. 2 is a conceptual side view showing the entire system of the method of the present invention.

FIG. 3 is a schematic sectional view showing one example of a mixer used in the present invention.

FIG. 4 is a conceptual perspective view showing an example of a stirring rotor of the apparatus of FIG.

FIG. 5 is a schematic perspective view showing a part of an example of the present transport device.

FIG. 6 is a schematic sectional view showing a part of another example of the present transport apparatus.

FIG. 7 is a schematic sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mixer 2 Input port 3 Excavated soil 4 High quality soil 5 Conveying device 6 Conveying device 7 Hopper 8 Hopper 9 Solidified material charging machine 10 Belt conveyor 11 Improved soil 12 Operation room 13 Generator

Claims (2)

[Claims] 1. A method for improving soil quality by mixing a soil modifying material with an excavated soil to be improved, comprising detecting an introduced amount of the excavated soil and inputting the amount of the soil modifying material according to the detected amount. And mixing of the excavated soil and the soil modifying material is performed by introducing the excavated soil and the soil modifying material, an inlet for introducing and mixing the mixture, and transferring the mixture provided in the main body. A plurality of stirring rotors having a rotation axis substantially perpendicular to the direction and having a number of rotating blades attached to the rotation axis, and a discharge port for discharging the mixture from the main body. A method for reclaiming excavated soil, wherein the method is performed in mixers provided on different rotating shafts. 2. The excavated soil is transported by a hopper, a bottom plate, a moving frame, and a transport plate provided at a predetermined distance from the moving frame at a right angle to the moving direction. The excavated soil reclaiming method according to claim 1, wherein the excavated soil is formed by a carrier device which goes around the bottom plate and which is a fixed type.