Stirring device and solidification treatment method

Abstract

To reduce labor, shorten working time, and improve work efficiency by excavating raw material soil, adding a solidifying material to the excavated raw material soil, and agitating and mixing the material.SOLUTION: An agitating device 10 that is swingably connected to a work vehicle and adds a solidification material to raw material soil and agitates and mixes the material comprises a support frame 12 having a pair of vertical frames 1202 extending in opposition to each other, the top of which is coupled to the tip of an arm so as to be swingable, an agitating device extending between a pair of vertical frames 1202 and rotatably supported by the pair of vertical frames 1202, a solidifying material injection pipe 18 for injecting a solidifying material between a pair of vertical frames 1202, a pair of side cutters 22 provided at the lower end of each of the pair of vertical frames 1202, and teeth 24 extending along the direction in which the pair of vertical frames 1202 face below the pair of side cutters 22.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an agitation device and a solidification method. [Background technology]

[0002] Many fill dams and reservoirs are aging and in need of embankment repairs (for earthquake reinforcement and to prevent water leakage), but in recent years, due to increasing urbanization in the surrounding areas, it has become difficult to obtain the embankment soil needed for embankment repairs. Meanwhile, although the muddy soil that has accumulated at the bottom of reservoirs is causing a decrease in storage capacity and a deterioration in water quality, making it necessary to remove it, it is difficult to secure disposal sites for the soil, and so the problem is that the soil has to be disposed of as industrial waste. Therefore, a crushing and compaction embankment method has been proposed that balances the difficulty of obtaining embankment soil with the removal and disposal of bottom mud, and does not require environmental destruction associated with securing embankment soil and soil disposal sites.This method involves attaching the embankment soil prepared by solidifying and improving the bottom mud, which is the raw mud soil, or a mixture of bottom mud and excavated soil from construction work, with a cement-based solidification material so that it has the required strength and water impermeability, to the excavated part of the upstream side of the existing embankment. The procedure is as follows: first, a cement-based solidification material is added to the raw soil, such as bottom muddy soil accumulated in the reservoir, and mixed while stirring to create an initial solidified soil. Next, the initial solidified soil is crushed and the crushed soil is spread evenly, and the soil is compacted a predetermined number of times to build an embankment layer by layer. Here, as an apparatus used for preparing solidified soil, for example, a self-propelled base machine equipped with a mixing device for mixing and stirring raw soil and solidification material slurry is known (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-129987 A Summary of the Invention [Problem to be solved by the invention]

[0004] When carrying out the solidification process in the above-mentioned crushing and rolling embankment method, the raw soil is poured into a solidification pit that has been constructed to a certain depth and width to create the solidified soil. Therefore, the mixing device is pushed into the raw soil in the solidification pit, and the solidification material is added and mixed while repeatedly moving back and forth in the front-to-back direction (width direction) and up-to-down direction (depth direction). However, if the raw soil is soft muddy soil, it is possible to easily push the mixing device into the raw soil and mix it. However, if the raw soil is too hard for the mixing device to be easily pushed into, the raw soil must be loosened so that the mixing device can be pushed in. To achieve this, for example, an attachment such as a bucket for digging raw soil must be attached to the end of the base machine's arm to excavate the raw soil to be solidified, and then the bucket must be removed and a mixing device must be attached, and solidification material must be added to the excavated raw soil to mix it. Alternatively, a separate construction machine such as a backhoe capable of excavating raw soil must be prepared, and the raw soil to be solidified must be excavated. Then, the construction machine must be moved, and a base machine equipped with a mixing device must be moved to the excavated raw soil, where the solidifying agent must be added and the soil must be mixed. In this way, if the raw soil is excavated using a separate attachment or separate construction machine and then the solidification process is carried out using a mixing device, it requires a great deal of labor and time, making the work complicated.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a mixing device and solidification treatment method that reduces labor, shortens working hours, and improves work efficiency by excavating raw soil, adding a solidification material to the excavated raw soil, and stirring and mixing it. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, one embodiment of the present invention is a mixing device that is swingably connected to the arm of a work vehicle having a swingable boom attached to a self-propelled vehicle and an arm swingably attached to the boom, and adds solidification material to raw soil and mixes it, and is characterized by having a support frame having a pair of vertical frames extending opposite to each other and an upper part of which is swingably connected to the tip of the arm, an mixing body that extends between the pair of vertical frames and is rotatably supported by the pair of vertical frames, a solidification material injection pipe that injects the solidification material between the pair of vertical frames, and a pair of side cutters provided at the lower end of each of the pair of vertical frames. Furthermore, one embodiment of the present invention is characterized in that, when the pair of vertical frames extend in the vertical direction, the side cutters are provided at the locations of the pair of vertical frames facing the self-propelled vehicle and extend along the extension direction of the vertical frames. In addition, one embodiment of the present invention is characterized in that the machine further includes teeth extending along the direction in which the pair of vertical frames face each other below the pair of side cutters. In addition, one embodiment of the present invention is characterized in that the agitator comprises an upper agitator extending between the middle portions of the pair of vertical frames in the extension direction and a lower agitator extending between the lower portions of the pair of vertical frames, and the solidification material injection pipe comprises an upper solidification material injection pipe provided between the upper agitator and the lower agitator, and a lower solidification material injection pipe provided below the lower agitator. In addition, one embodiment of the present invention is characterized in that the upper solidification material injection pipe is supported by one of the pair of vertical frames, and the lower solidification material injection pipe is supported by the upper surface of the tooth. In addition, one embodiment of the present invention is characterized in that the upper solidification material injection pipe and the lower solidification material injection pipe extend along the direction in which the pair of vertical frames face each other, the upper solidification material injection pipe is provided with a plurality of upper solidification material injection ports that inject the solidification material at intervals in its extension direction, and the lower solidification material injection pipe is provided with a plurality of lower solidification material injection ports that inject the solidification material at intervals in its extension direction. In addition, one embodiment of the present invention is characterized in that an upper solidification material supply pipe is provided to the upper solidification material injection pipe for supplying the solidification material, and a lower solidification material supply pipe is provided to the lower solidification material injection pipe for supplying the solidification material, the upper solidification material supply pipe is supported by one of the pair of vertical frames, and the lower solidification material supply pipe is supported by the other vertical frame of the pair of vertical frames. Also, one embodiment of the present invention is a solidification method for adding a solidification material to raw soil, stirring and mixing the raw soil, and solidifying the raw soil by using a work vehicle having a swingable boom attached to a self-propelled vehicle and an arm swingably attached to the boom, and a mixing device swingably connected to the arm, the mixing device including a support frame having a pair of vertical frames extending opposite to each other, an upper portion of which is swingably connected to a tip of the arm, a stirring body extending between the pair of vertical frames and rotatably supported by the pair of vertical frames, and a mixing device for the pair of vertical frames. The device is configured to include a solidification material injection pipe which injects the solidification material between the frames, and a side cutter provided at the lower end of each of the pair of vertical frames, and is characterized in that the agitator is rotated while the pair of vertical frames are maintained in an extended position in the vertical direction and the agitator is moved in the direction of the self-propelled vehicle, thereby excavating the raw soil with the side cutter, and the agitator is pushed into the excavated raw soil and the solidification material is injected from the solidification material injection pipe, thereby mixing and stirring the solidification material and the raw soil with the agitator. In addition, one embodiment of the present invention is characterized in that the mixing device further includes teeth extending along the direction in which the pair of vertical frames face each other below the pair of side cutters, and when the mixing device is moved toward the self-propelled vehicle, the teeth excavate the raw soil together with the side cutters. Effect of the Invention

[0007] According to one embodiment of the present invention, the mixing device is equipped with a mixer body rotatably supported on a pair of vertical frames and a pair of side cutters provided at the lower ends of each of the pair of vertical frames.By excavating raw soil with the pair of side cutters, adding a solidifying material to the excavated raw soil and mixing it with the mixer body, this is advantageous in reducing labor, shortening working time and improving work efficiency. In addition, if the side cutters are provided at a pair of vertical frames facing the self-propelled vehicle and extend along the extension direction of the vertical frames, the raw soil can be efficiently crushed and excavated when the mixing device is moved toward the self-propelled vehicle, which is advantageous in reducing labor, shortening working time, and improving work efficiency. Furthermore, if the configuration is such that a pair of vertical frames have teeth extending in opposing directions below the pair of side cutters, the teeth excavate the raw soil together with the pair of side cutters, which is advantageous in reducing labor, shortening working time, and improving work efficiency. In addition, if the agitator comprises an upper agitator extending between the middle parts of a pair of vertical frames in the extension direction and a lower agitator extending between the lower parts of the pair of vertical frames, and the solidification material injection pipe comprises an upper solidification material injection pipe provided between the upper agitator and the lower agitator, and a lower solidification material injection pipe provided below the lower agitator, this is advantageous for efficiently stirring and mixing the raw soil. Furthermore, if the upper solidification material injection pipe is supported by one of a pair of vertical frames and the lower solidification material injection pipe is supported by the upper surface of the tooth, the upper solidification material injection pipe can be positioned between the upper agitator and the lower agitator, and the lower solidification material injection pipe can be positioned at the lower end of the agitator, which is advantageous for efficiently adding and mixing the solidification material with the raw soil. In addition, if the upper solidification material injection pipe and the lower solidification material injection pipe are extended along the direction in which a pair of vertical frames face each other, and multiple upper solidification material injection ports are provided at intervals in the extension direction of the upper solidification material injection pipe, and multiple lower solidification material injection ports are provided at intervals in the extension direction of the lower solidification material injection pipe, this is advantageous for uniformly adding and mixing the solidification material to the raw soil. Furthermore, if the upper solidification material supply pipe is supported by one of a pair of vertical frames and the lower solidification material supply pipe is supported by the other vertical frame of the pair of vertical frames, it is advantageous to separate the solidification material supply pipe for each vertical frame, so that the upper solidification material injection pipe and the lower solidification material injection pipe can be positioned at any desired position.This allows the lower solidification material injection pipe to be positioned at the lowest position, which is advantageous for efficiently adding and mixing the solidification material to the raw soil. In addition, according to one embodiment of the present invention, the mixing device is equipped with an agitator rotatably supported on a pair of vertical frames, a solidification material injection pipe that injects a solidification material between the pair of vertical frames, and a pair of side cutters provided at the lower ends of each of the pair of vertical frames, and by rotating the agitator and maintaining the pair of vertical frames extended in the vertical direction while moving the mixing device in the direction of the self-propelled vehicle, the side cutters excavate the raw soil, and the solidification material is injected from the solidification material injection pipe while the mixing device is pushed into the excavated raw soil, thereby mixing and stirring the solidification material and the raw soil with the agitator. Therefore, by excavating the raw soil with the pair of side cutters, adding a solidification material to the excavated raw soil, and mixing it with the agitator, it is advantageous in reducing labor, shortening working time, and improving working efficiency. In addition, the mixing device is further equipped with teeth extending in the direction in which the pair of vertical frames face each other below the pair of side cutters, and when the mixing device is moved toward the self-propelled vehicle, the teeth excavate the raw soil together with the side cutters, which is advantageous in reducing labor, shortening working time, and improving work efficiency. [Brief description of the drawings]

[0008] [Figure 1] This is an overall configuration diagram showing the state in which the mixing device is swingably connected to the arm of the base machine to mix and stir the raw soil and solidification material. [Diagram 2] FIG. 2 is a front view showing a part of the stirring device in a cutaway view. [Diagram 3] FIG. [Figure 4] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the work vehicle 100 to which the mixing device 10 of this embodiment is attached has a swingable boom 104 provided on a base machine 102, which is a self-propelled vehicle, and an arm 106 swingably provided on the boom 104. The mixing device 10 of this embodiment is swingably connected to the arm 106 of the work vehicle 100, and mixes and stirs raw soil such as dredged soil to be used in the solidification process while adding solidification material, thereby creating solidified soil.

[0010] The mixing device 10 includes a support frame 12, a mixer 14, a drive motor 16, a solidification material injection pipe 18, a solidification material supply pipe 20, a pair of side cutters 22, and teeth 24. In this embodiment, the face of the mixing device 10 on the side of the base machine 102 will be referred to as the back face, and the face of the mixing device 10 opposite the base machine 102 will be referred to as the front face. Also, as shown in Fig. 1, the direction in which the base machine 102 is located (towards the self-propelled vehicle) as viewed from the mixing device 10 will be referred to as the rear (arrow R), and the direction opposite to the direction in which the base machine 102 is located (opposite to the self-propelled vehicle) will be referred to as the front (arrow F).

[0011] The support frame 12 is configured to include a pair of vertical frames 1202 made of steel material extending opposite each other, and a horizontal frame 1204 connecting the upper parts of the pair of vertical frames 1202. The vertical frames 1202 and the horizontal frames 1204 are hollow steel materials with rectangular cross sections, and have a sealed structure that prevents soil and water from entering, forming a closed cross-sectional structure that ensures strength and rigidity. The pair of vertical frames 1202 have their upper portions swingably connected to the tip of the arm 106 via a horizontal frame 1204. Specifically, a pair of plate-shaped connecting portions 1206 for connecting the stirrer 10 to the arm 106 are provided in the center of the horizontal frame 1204 in the longitudinal direction. The tip of the arm 106 is disposed between the pair of connecting portions 1206, and a connecting pin (not shown) is inserted between them, so that the support frame 12 is swingably and detachably connected to the tip of the arm 106.

[0012] The agitator 14 extends between a pair of vertical frames 1202 and is rotatably supported by the pair of vertical frames 1202, and is configured with an upper agitator 14A and a lower agitator 14B that are spaced apart vertically. The upper agitator 14A and the lower agitator 14B rotate with the agitator 10 pressed into the raw soil, thereby agitating and mixing the raw soil to which the solidification material has been added.

[0013] The upper stirring body 14A is provided extending between the middle parts of the pair of vertical frames 1202 in the extending direction. Specifically, the upper agitator 14A has an upper rotating shaft 1402A extending between the pair of vertical frames 1202 between the middle parts of the pair of vertical frames 1202 in the extension direction of the pair of vertical frames 1202, and both ends of the upper rotating shaft 1402A each penetrate the opposing side walls of the pair of vertical frames 1202 and are positioned inside the pair of vertical frames 1202. Both ends of the upper rotating shaft 1402A are rotatably supported by the pair of vertical frames 1202 via bearings 1404A and 1406A. The upper stirring body 14A is provided with a plurality of upper stirring blades 1408A which protrude from the outer periphery of the upper rotating shaft 1402A in a direction away from the outer periphery and are provided over the entire length of the upper rotating shaft 1402A. The upper agitating blades 1408A are chopper-type agitating blades that are excellent in uniformity of agitation, and are provided on the outer periphery of the upper rotating shaft 1402A at a predetermined angle θ1 with respect to the axis A of the upper rotating shaft 1402A.

[0014] The lower agitator 14B is provided extending between the lower parts of a pair of vertical frames 1202. Specifically, the lower agitator 14B has a lower rotating shaft 1402B extending between the pair of vertical frames 1202 between the lower portions of the pair of vertical frames 1202, and both ends of the lower rotating shaft 1402B penetrate opposing side walls of the pair of vertical frames 1202 and are positioned inside the pair of vertical frames 1202. Both ends of the lower rotating shaft 1402B are rotatably supported by the pair of vertical frames 1202 via bearings 1404B and 1406B. The lower stirring body 14B is provided with a plurality of lower stirring blades 1408B which protrude from the outer periphery of the lower rotating shaft 1402B in a direction away from the outer periphery and are provided over the entire length of the lower rotating shaft 1402B. The multiple lower stirring blades 1508B are paddle-type stirring blades having excellent durability, and are provided on the outer periphery of the lower rotating shaft 1402B at a predetermined angle θ2 with respect to the axis B of the lower rotating shaft 1402B. In this embodiment, the upper agitator 14A is configured with a chopper-type agitator blade, and the lower agitator 14B is configured with a paddle-type agitator blade, but it is possible to select an agitator blade of a shape appropriate for the material to be agitated, such as raw soil.

[0015] The drive motor 16 drives and rotates the agitator 14 which is rotatably supported by a pair of vertical frames 1202 of the support frame 12, and is configured to include an upper drive motor 16A and a lower drive motor 16B.

[0016] The upper drive motor 16A, which drives and rotates the upper agitator 14A, is composed of a hydraulic motor driven by hydraulic pressure from a hydraulic device provided in the base machine 102, and is housed in a housing 1602A with a sealed structure. The upper drive motor 16A including the housing 1602A is attached to one of the vertical frames 1202A by connecting the lower end of the housing 1602A and the upper end of the one of the vertical frames 1202A with a bolt B1. A drive sprocket 1604A is provided on the upper drive motor 16A, and a driven sprocket 1606A is provided on one end of the upper rotating shaft 1402A of the upper agitator 14A. A sprocket chain 1608A is wound around the drive sprocket 1604A and the driven sprocket 1606A, passing through the inside of the vertical frame 1202A. The upper drive motor 16A is configured so that hydraulic pressure from a hydraulic pump 30 installed on the base machine 102 is supplied via a forward / reverse switching circuit 32 consisting of a flow path switching valve and its operating unit, and a flow control circuit 34 consisting of a flow control valve and its operating unit.

[0017] The lower drive motor 16B drives and rotates the lower agitator 14B, and like the upper drive motor 16A, is composed of a hydraulic motor driven by hydraulic pressure from a hydraulic device provided in the base machine 102, and is housed in a sealed housing 1602B. The lower drive motor 16B including the housing 1602B is attached to the other vertical frame 1202B by connecting the lower end of the housing 1602B and the upper end of the other vertical frame 1202B with a bolt B2. The lower drive motor 16B is provided with a drive sprocket 1604B, and one end of the lower rotating shaft 1402B of the lower agitator 14B is provided with a driven sprocket 1606B. A sprocket chain 1608B is wound around the drive sprocket 1604B and the driven sprocket 1606B, passing through the inside of the vertical frame 1202B. The lower drive motor 16B is configured so that hydraulic pressure from a hydraulic pump 30 installed on the base machine 102 is supplied via a forward / reverse rotation switching circuit 36 ​​consisting of a flow path switching valve and its operating unit, and a flow control circuit 38 consisting of a flow rate adjustment valve and its operating unit.

[0018] The solidification material injection pipe 18 is used to inject the solidification material between a pair of vertical frames 1202, and is composed of an upper solidification material injection pipe 18A and a lower solidification material injection pipe 18B arranged at a distance above and below. When the raw soil is stirred and mixed with the mixing device 10 pressed into the raw soil, the upper solidification material injection pipe 18A and the lower solidification material injection pipe 18B inject the solidification material supplied through the solidification material supply pipe 20 described later into the raw soil.

[0019] The upper solidification material injection pipe 18A is supported by a cantilever on one of the pair of vertical frames 1202A, and extends between the upper agitator 14A and the lower agitator 14B along the direction in which the pair of vertical frames 1202 face each other (the extension direction of the horizontal frame 1204). The upper solidification material injection pipe 18A is provided with a plurality of upper solidification material injection ports 1802A that inject the solidification material at intervals in the extension direction. In this embodiment, three upper solidification material injection ports 1802A are provided at predetermined intervals. By the upper solidification material injection pipe 18A configured in this manner, the solidification material supplied from the upper solidification material supply pipe 20A described later is injected from multiple locations spaced apart in the extension direction of the upper solidification material injection pipe 18A between the upper stirrer 14A and the lower stirrer 14B.

[0020] The lower solidification material injection pipe 18B is supported on the upper surface of the teeth 24 described later, and is provided below the lower agitator 14B, extending along the direction in which a pair of vertical frames 1202 face each other (the extension direction of the horizontal frame 1204). The lower solidifying material injection pipe 18B is provided with a plurality of lower solidifying material injection ports 1802B for injecting the solidifying material at intervals in the extending direction. In this embodiment, similar to the upper solidifying material jetting pipe 18A, three lower solidifying material jetting ports 1802B are provided at predetermined intervals. By using the lower solidification material injection pipe 18B configured in this manner, the solidification material supplied from the lower solidification material supply pipe 20B described later is injected from multiple locations spaced apart in the extension direction of the lower solidification material injection pipe 18B below the lower agitator 14B, i.e., below the agitation device 10.

[0021] The solidification material supply pipe 20 supplies solidification material to the solidification material injection pipes 18 (upper solidification material injection pipe 18A and lower solidification material injection pipe 18B), and is composed of an upper solidification material supply pipe 20A and a lower solidification material supply pipe 20B. The upper solidification material supply pipe 20A is disposed along the front side of one of the vertical frames 1202A and is supported by the one of the vertical frames 1202A. One end of the upper solidification material supply pipe 20A is connected to the upper solidification material injection pipe 18A, and the other end is connected to a solidification material tank (not shown) that stores the solidification material via an external supply pipe 54A of the solidification material supply device 50 provided outside the vertical frame 1202A. The lower solidification material supply pipe 20B is disposed along the other vertical frame 1202B on the front side of the other vertical frame 1202B and is supported by the other vertical frame 1202B. One end of the lower solidification material supply pipe 20B is connected to the lower solidification material injection pipe 18B, and the other end is connected to a solidification material tank (not shown) via an external supply pipe 54B of the solidification material supply device 50 provided outside the vertical frame 1202B.

[0022] The solidification material supply pipe 20 is supplied with the solidification material by a solidification material supply device 50 . The solidification material supply device 50 is manually operated to supply and stop the supply of solidification material, and as shown in Figure 2, is configured with a supply pump 52, external supply pipes 54A, 54B connected to the supply pump 52, solidification material adjustment valves 56A, 56B provided on the external supply pipes 54A, 54B, and a solidification material tank (not shown). The solidification material supply device 50 supplies the solidification material stored in the solidification material tank to the upper solidification material supply pipe 20A and the lower solidification material supply pipe 20B via external supply pipes 54A and 54B by a supply pump 52. At this time, the solidification material adjustment valves 56A and 56B are adjusted so that a predetermined amount of solidification material can be supplied to both or either of the upper solidification material supply pipe 20A and the lower solidification material supply pipe 20B.

[0023] The pair of side cutters 22 are plate-shaped members for excavating raw soil, and are provided at the lower ends of the pair of vertical frames 1202 as shown in FIG. The pair of side cutters 22 are provided at the lower ends of the pair of vertical frames 1202 facing the base machine 102 with the pair of vertical frames 1202 of the mixing device 10 extended in the vertical direction, and extend along the extension direction of the pair of vertical frames 1202. That is, as shown in Figures 3 and 4, a pair of side cutters 22 are provided, with side cutter 22A at the lower end of the back surface of one vertical frame 1202A and side cutter 22B at the lower end of the back surface of the other vertical frame 1202B, and each extending along the extension direction of the pair of vertical frames 1202. In addition, the pair of side cutters 22 are attached to the pair of vertical frames 1202 by bolts (not shown). When the mixing device 10 is moved backward toward the self-propelled vehicle (toward the base machine 102) while maintaining the pair of vertical frames 1202 extended in the vertical direction, the pair of side cutters 22 move in a direction along the plate-shaped surface, and the end portion 2202 (see Figure 3) located on the base machine 102 side excavates and loosens the raw soil. In addition, if the ends of the pair of side cutters 22 become chipped, damaged, or bent due to repeated excavation of the raw soil, it is possible to loosen the bolts and remove them, and then install new side cutters 22. The pair of side cutters 22 in this embodiment are formed in a plate shape having a predetermined length along the extending direction of the pair of vertical frames 1202, but various known shapes can be applied.

[0024] The teeth 24 are plate-shaped members used to excavate raw soil, and as shown in Figures 2 and 3, are provided below the pair of side cutters 22, extending along the direction in which the pair of vertical frames 1202 face each other (the extension direction of the horizontal frame 1204). The teeth 24 are inclined so that, when the pair of vertical frames 1202 of the mixing device 10 are extended in the vertical direction, the rear end 2402 located on the base machine 102 side is positioned lower than the front end 2404. Moreover, the teeth 24 are attached to a pair of vertical frames 1202 by bolts (not shown). When the mixing device 10 is moved rearward toward the self-propelled vehicle (toward the base machine 102) while maintaining the pair of vertical frames 1202 extended in the vertical direction, the teeth 24 move in a direction perpendicular to the extension direction and excavate and loosen the raw soil with the rear end 2402. Also, like the pair of side cutters 22, if the ends of the teeth 24 become chipped, damaged, or bent due to repeated excavation of the raw soil, it is possible to loosen the bolts and remove the teeth 24, and then install new teeth 24. The teeth 24 in this embodiment are plate-like members extending in the direction in which the pair of vertical frames 1202 face each other (the extension direction of the horizontal frame 1204), but various known shapes are applicable. For example, the teeth 24 may be configured such that multiple claws with tapered tips are provided at predetermined intervals in the extension direction of the teeth 24.

[0025] Next, the solidification process operation of the agitation device 10 according to this embodiment will be described. First, when creating solidified soil by adding a cement-based solidification material to raw soil such as mud and sand accumulated in a reservoir and stirring and mixing it, a solidification pit S with a depth D (e.g., D = 2.5 m) and width W (e.g., W = 4.0 m) is constructed as shown in Figure 1, and the raw soil such as mud and sand excavated from the bottom of the reservoir is poured into it. Then, the mixer 10 is inserted into the raw soil in the solidification pit S by the boom 104 and arm 106 of the base machine 102, and the raw soil and the solidification material are mixed while being added. For example, the mixer 10 is moved up and down at the location shown by the solid line in Fig. 1 to mix and mix the raw soil and the solidification material, and the mixer 10 is moved up and down each time it moves a predetermined distance from this mixing location to the location shown by the two-dot chain line in Fig. 1 to mix and mix the raw soil and the solidification material. However, when raw soil that is too hard for the mixer 10 to easily compress is to be solidified by the mixer 10, the mixer 10 is operated as follows. The solidification treatment operation by the agitation device 10 described below is merely an example, and is not limited to this, and it is possible to perform an operation according to the state and circumstances of the raw soil.

[0026] First, the base machine 102 is moved close to the raw soil to be solidified, and the mixing device 10 connected to the tip of the arm 106 is held in a suspended state above the raw soil with a pair of vertical frames 1202 extended in the vertical direction. Next, the agitator 14 is rotated while the pair of vertical frames 1202 are maintained in an extended position in the vertical direction, and the agitator 10 is moved in the direction of the self-propelled vehicle, thereby excavating the raw soil with the side cutter 22 and teeth 24. Specifically, the hydraulic pump 30 is started, and the hydraulic pressure discharged from the hydraulic pump 30 is supplied to the lower drive motor 16B via the forward / reverse rotation switching circuit 36 ​​and the flow control circuit 38, thereby driving the lower drive motor 16B to rotate the lower agitator 14B. Moreover, the hydraulic pressure discharged from the hydraulic pump 30 is supplied to the upper drive motor 16A via the forward / reverse switching circuit 32 and the flow rate control circuit 34 to drive the upper drive motor 16A, thereby rotating the upper agitator 14A. Then, the boom 104 and the arm 106 are operated to lower the mixing device 10 until the teeth 24 come into contact with the raw soil, and the mixing device 10 is moved rearward while maintaining the pair of vertical frames 1202 extended in the vertical direction. After the agitator 10 has been moved backward by a predetermined distance, the boom 104 and the arm 106 are operated to raise the agitator 10 once, return it to the front, and then lower it again to move it backward. In this embodiment, the mixing device 10 is provided with side cutters 22 and teeth 24, and by repeatedly moving the mixing device 10 back and forth, the side cutters 22 and teeth 24 excavate and loosen the raw soil from the surface.

[0027] Then, with the agitator 10 pressed into the excavated raw soil, a solidification material is sprayed from the solidification material spray pipe 18, whereby the agitator 14 mixes the solidification material and the raw soil. Specifically, the mixing device 10 is pushed into the excavated and loosened raw soil, and once the lower mixing body 14B has been pushed into the raw soil, the supply pump 52 of the solidification material supply device 50 is started and the solidification material adjustment valve 56B is operated to supply solidification material to the lower solidification material injection pipe 18B via the external supply pipe 54B and the lower solidification material supply pipe 20B, thereby spraying the solidification material from each lower solidification material injection port 1802B downward toward the lower mixing body 14B. Then, the lower agitator 14B agitates and mixes the raw soil and the solidification material injected from the lower solidification material injection port 1802B. Furthermore, as the raw soil is excavated and the upper mixer 14A is pushed into the excavated and loosened raw soil, the solidification material adjustment valve 56A is operated to supply solidification material to the upper solidification material injection pipe 18A via the external supply pipe 54A and the upper solidification material supply pipe 20A, and the solidification material from each upper solidification material injection port 1802A is injected toward the space between the upper mixer 14A and the lower mixer 14B. Then, the upper agitator 14A further agitates and mixes the mixture of raw soil and solidification material agitated and mixed by the lower agitator 14B with the solidification material injected from the upper solidification material injection port 1802A.

[0028] When the raw soil is loosened and mixed to the extent that the entire mixing device 10 can be pushed into it, the raw soil is further mixed with the solidifying material until it is uniformly mixed therein. That is, for example, the boom 104 and arm 106 of the base machine 102 are used to repeatedly move the mixing device 10 up and down in the raw soil and move the mixing device 10 forward and backward. In this way, by providing a pair of side cutters 22 and teeth 24, the mixing device 10 of this embodiment can excavate and mix not only mud but also raw soil that is too hard for the mixing device 10 to easily push into, making it possible to mix and mix shallow layers, for example.

[0029] Here, the direction and speed of rotation of the lower agitator 14B and the upper agitator 14A are changed depending on the soil properties of the raw soil to be agitated and mixed. That is, the rotation direction of the lower agitator 14B is changed by switching the forward / reverse switching circuit 36 ​​to the forward or reverse side. The rotation speed of the lower agitator 14B is adjusted by operating the flow control circuit 38 to control the hydraulic flow rate to the lower drive motor 16B. The rotation direction of the upper agitator 14A is changed by switching the forward / reverse switching circuit 32 to the forward or reverse side. The rotation speed of the upper agitator 14A is adjusted by operating the flow control circuit 34 to control the hydraulic flow rate to the upper drive motor 16A.

[0030] The timing at which the supply of the solidification material from the lower solidification material jetting port 1802B and the upper solidification material jetting port 1802A starts is determined and executed depending on the soil properties and mixing conditions of the raw soil being mixed and stirred. That is, in the above-mentioned operation, when the rotating lower agitator 14B is pushed into the raw soil, the supply pump 52 and the solidification material adjustment valve 56B are operated to start the supply of solidification material from the lower solidification material injection port 1802B. Also, when the rotating upper agitator 14A is pushed into the raw soil, the solidification material adjustment valve 56A is operated to start the supply of solidification material from the upper solidification material injection port 1802A. In addition, the supply amount of the solidification material supplied from the lower solidification material jetting port 1802B and the upper solidification material jetting port 1802A can be appropriately adjusted by operating the solidification material adjusting valve 56B and the solidification material adjusting valve 56A. The "supply amount of solidification material" refers to the supply amount of solidification material per unit time, for example, the volume V(L) of solidification material per minute. Then, when the supply amount of solidification material reaches a predetermined supply amount (required supply amount) required for stirring and mixing, the supply pump 52, the solidification material adjustment valve 56B, and the solidification material adjustment valve 56A are operated to stop the supply of solidification material from the lower solidification material injection port 1802B and the upper solidification material injection port 1802A.

[0031] According to the mixing device 10 of this embodiment, the mixing device 10 is provided with an agitator 14 rotatably supported by a pair of vertical frames 1202, and a pair of side cutters 22 provided at the lower ends of each of the pair of vertical frames 1202. Even when solidifying raw soil that is too hard for the mixing device 10 to easily compress, the raw soil can be excavated by the pair of side cutters 22, a solidifying material can be added to the excavated raw soil, and the raw soil can be mixed and stirred by the agitator 14, which is advantageous in reducing labor, shortening work time, and improving work efficiency. Furthermore, if the side cutter 22 is provided at the lower end of the back surface of a pair of vertical frames 1202 and extends along the extension direction of the vertical frames 1202, when the mixing device 10 is moved rearward in the direction of the self-propelled vehicle (toward the base machine 102), the raw soil can be efficiently crushed and excavated, which is advantageous in reducing labor, shortening working time, and improving work efficiency.

[0032] Furthermore, if the configuration is such that teeth 24 extend along the opposing direction of the pair of vertical frames 1202 (the extension direction of the horizontal frame 1204) below the pair of side cutters 22, the teeth 24 excavate the raw soil together with the pair of side cutters 22, which is advantageous in reducing labor, shortening work time, and improving work efficiency. Furthermore, if the agitator 14 is configured to include an upper agitator 14A extending between the middle parts of a pair of vertical frames 1202 in the extension direction, and a lower agitator 14B extending between the lower parts of the pair of vertical frames 1202, and the solidification material injection pipe 18 is configured to include an upper solidification material injection pipe 18A provided between the upper agitator 14A and the lower agitator 14B, and a lower solidification material injection pipe 18B provided below the lower agitator 14B, this is advantageous for efficiently stirring and mixing the raw soil. Furthermore, if the upper solidification material injection pipe 18A is supported by one of the vertical frames 1202A of the pair of vertical frames 1202, and the lower solidification material injection pipe 18B is supported by the upper surface of the tooth 24, the upper solidification material injection pipe 18A can be positioned between the upper agitator 14A and the lower agitator 14B, and the lower solidification material injection pipe 18B can be positioned at the lower end of the agitator 10, which is advantageous for efficiently adding and mixing the solidification material to the raw soil.

[0033] In addition, if the upper solidification material injection pipe 18A and the lower solidification material injection pipe 18B are extended along the direction in which a pair of vertical frames 1202 face each other, and multiple upper solidification material injection ports 1802A are provided at intervals in the extension direction of the upper solidification material injection pipe 18A, and multiple lower solidification material injection ports 1802B are provided at intervals in the extension direction of the lower solidification material injection pipe 18B, this is advantageous for uniformly adding and mixing the solidification material to the raw soil. Furthermore, if the upper solidification material supply pipe 20A is supported by one of the vertical frames 1202A of a pair of vertical frames 1202, and the lower solidification material supply pipe 20B is supported by the other vertical frame 1202B of the pair of vertical frames 1202, then by separating the solidification material supply pipe 20 for each vertical frame 1202, it is advantageous to position the upper solidification material injection pipe 18A and the lower solidification material injection pipe 18B at any desired position. As a result, the lower solidification material injection pipe 18B can be positioned at the lowest position, which is advantageous for efficiently adding and mixing the solidification material to the raw soil.

[0034] In addition, the mixing device 10 is provided with a pair of side cutters 22 (22A, 22B) provided at the lower end of each of the pair of vertical frames 1202, and by rotating the upper mixing body 14A and the lower mixing body 14B and moving the mixing device 10 toward the self-propelled vehicle while maintaining the pair of vertical frames 1202 extended in the vertical direction, the raw soil is excavated by the side cutters 22, and the solidification material is sprayed from the solidification material spray pipe 18 while the mixing device 10 is pushed into the excavated raw soil, and the solidification material and the raw soil are mixed and mixed by the upper mixing body 14A and the lower mixing body 14B. Therefore, by excavating the raw soil with the pair of side cutters 22, adding the solidification material to the excavated raw soil, and mixing and mixing it with the upper mixing body 14A and the lower mixing body 14B, it is advantageous in reducing labor, shortening work time, and improving work efficiency. Furthermore, the mixing device 10 is provided with teeth 24 extending in the opposing direction of a pair of vertical frames 1202 below the pair of side cutters 22. When the mixing device 10 is moved rearward in the direction of the self-propelled vehicle (toward the base machine 102), the teeth 24 excavate the raw soil together with the side cutters 22, which is advantageous in reducing labor, shortening working time, and improving work efficiency. [Explanation of symbols]

[0035] 10 Mixing device 12 Support frame 1202 Pair of vertical frames 1204 Horizontal Frame 14 Agitator 14A Upper agitator 14B Lower agitator 16 Drive motor 16A upper drive motor 16B Lower drive motor 18 Solidifying agent injection pipe 18A Upper solidifying agent injection pipe 1802A Upper solidifying agent injection port 18B Lower solidifying material injection pipe 1802B Lower solidifying agent injection port 20 Solidifying material supply pipe 20A Upper solidifying material supply pipe 20B Lower solidification material supply pipe 22(22A, 22B) Side cutter 24 Two 30 Hydraulic Pump 32, 36 Forward / reverse switching circuit 34, 38 Flow control circuit 50 Solidifying material supply device 52 Supply Pump 54A, 54B External supply pipe 56A, 56B Solidification material adjustment valve 100 Work vehicles 102 Base Machine 104 Boom 106 Arm

Claims

1. A mixing device that is swingably connected to the arm of a work vehicle having a swingable boom provided on a self-propelled vehicle and an arm swingably provided on the boom, and that adds a solidification material to raw soil and mixes the raw soil, a support frame having a pair of vertical frames extending opposite to each other, the upper portion of which is swingably connected to the tip portion of the arm; A stirring body extending between the pair of vertical frames and rotatably supported by the pair of vertical frames; a solidification material injection pipe for injecting the solidification material between the pair of vertical frames; A pair of side cutters are provided at lower ends of the pair of vertical frames facing the self-propelled vehicle in a state in which the pair of vertical frames extend in the up-down direction, and extend along the extension direction of the vertical frames; and teeth extending along a direction in which the pair of vertical frames face each other below the pair of side cutters, The stirring body includes an upper stirring body extending between the middle parts of the pair of vertical frames in the extending direction, and a lower stirring body extending between the lower parts of the pair of vertical frames, The solidification material injection pipe includes an upper solidification material injection pipe provided between the upper stirring body and the lower stirring body, and a lower solidification material injection pipe provided below the lower stirring body. A stirring device characterized by:

2. The upper solidification material injection pipe is supported by one of the pair of vertical frames, The lower solidification material injection pipe is supported on the upper surface of the tooth.

2. The stirring device according to claim 1 .

3. The upper solidification material injection pipe and the lower solidification material injection pipe extend along a direction in which the pair of vertical frames face each other, The upper solidification material injection pipe is provided with a plurality of upper solidification material injection ports that inject the solidification material at intervals in the extension direction thereof, The lower solidification material injection pipe is provided with a plurality of lower solidification material injection ports that inject the solidification material at intervals in the extension direction.

3. The stirring device according to claim 2.

4. An upper solidification material supply pipe is provided to supply the solidification material to the upper solidification material injection pipe, and a lower solidification material supply pipe is provided to supply the solidification material to the lower solidification material injection pipe, The upper solidification material supply pipe is supported by one of the pair of vertical frames, The lower solidification material supply pipe is supported by the other vertical frame of the pair of vertical frames.

4. The stirring device according to claim 2 or 3.

5. A solidification method for adding a solidification material to raw soil, mixing and agitating the raw soil, and performing a solidification treatment using a work vehicle having a swingable boom attached to a self-propelled vehicle and an arm swingably attached to the boom, and a mixing device swingably connected to the arm, comprising: The stirring device is a support frame having a pair of vertical frames extending opposite to each other, the upper portion of which is swingably connected to the tip portion of the arm; A stirring body extending between the pair of vertical frames and rotatably supported by the pair of vertical frames; a solidification material injection pipe for injecting the solidification material between the pair of vertical frames; A pair of side cutters are provided at lower ends of the pair of vertical frames facing the self-propelled vehicle in a state in which the pair of vertical frames extend in the up-down direction, and extend along the extension direction of the vertical frames; and teeth extending along a direction in which the pair of vertical frames face each other below the pair of side cutters, The stirring body includes an upper stirring body extending between the middle parts of the pair of vertical frames in the extending direction, and a lower stirring body extending between the lower parts of the pair of vertical frames, The solidification material injection pipe includes an upper solidification material injection pipe provided between the upper stirring body and the lower stirring body, and a lower solidification material injection pipe provided below the lower stirring body, The stirring body is rotated, and the pair of vertical frames are maintained in an extended state in the vertical direction while the stirring device is moved toward the self-propelled vehicle, so that the raw soil is excavated by the side cutter and the teeth. When the lower agitator is pushed into the excavated raw soil, the solidification material is sprayed from the lower solidification material spray pipe toward the lower agitator, so that the lower agitator mixes and mixes the raw soil and the solidification material. When the upper agitator is pushed into the excavated raw soil, the solidification material is sprayed from the upper solidification material spray pipe toward between the upper agitator and the lower agitator, so that the upper agitator further mixes the mixture of the raw soil and the solidification material mixed by the lower agitator with the solidification material sprayed from the upper solidification material spray pipe. A solidification treatment method comprising the steps of:

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