Ground Improvement Device

Abstract

To provide a ground improvement apparatus capable of reliably performing stirring, even when a ground improvement target is soil such as viscous soil in which a corotation phenomenon is likely to occur, in which corotation or the like is unlikely to occur, excavation and stirring mixing can be satisfactorily performed, stirring can be performed without resistance to pushing, and stirring can be efficiently performed without forming lumps.SOLUTION: This ground improvement apparatus comprises a rotating stirring blade rotatably attached to a support suspended from a tip of a work arm of a construction machine, wherein the rotating stirring blade is a chain-type stirring blade device including a driving sprocket, a driven sprocket, and an endless chain stretched between these sprockets, with stirring blade bodies fixed at predetermined intervals on an outer peripheral surface of the endless chain, a third chain-type stirring blade device being provided between first and second chain-type stirring blade devices arranged on left and right sides, and the first and second chain-type stirring blade devices and the third chain-type stirring blade device being configured to rotate in mutually opposite directions.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ground improvement device for solidifying the shallow to intermediate layers of soft ground on the ground surface. [Background technology]

[0002] Methods for improving soft ground can be broadly divided into surface ground improvement methods and deep ground improvement methods depending on the depth of the improvement. One of the surface ground improvement methods in the former category is the chemical improvement method (surface solidification method).

[0003] This method involves excavating the surface ground while adding solidifying materials such as cement or lime into the ground, and then stirring and mixing the ground to chemically solidify it.A well-known ground improvement machine used is a trencher-type ground improvement machine with a chain-type stirring blade device, which has multiple stirring blades attached to an endless chain that moves around the ground to excavate the ground and stir and mix it.

[0004] The following patent document is one such example, and as shown in Figures 10 and 11, the ground improvement device 1 is equipped with a chain-type agitator device including a support 10 for attachment to the lower end of a movable arm 3 extending from a work vehicle 2, a drive sprocket 11 arranged on the upper part of the support 10, a driven sprocket 12 arranged on the lower part of the support 10, an endless chain 43 suspended between these sprockets 11, 12, and a plurality of rotatable blades 44 provided on the outer surface of the endless chain 43. [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-97997

[0005] It is attached to the lower end of a movable arm 3 extended from a work vehicle 2, and as the movable arm 3 moves up and down, it rises and falls underground, excavating ground 5 consisting of soft soil, etc., and stirring and mixing the soil with a solidification material described below to produce improved soil 6 suitable for building foundations, etc.

[0006] A solidification material supply pipe 4 is connected to the work vehicle 2 to supply a solidification material such as slurry or powder cement from a storage tank to the excavation site. The solidification material supply pipe 4 runs from the work vehicle 2 along the movable arm 3 to the vicinity of the driven sprocket 12 of the ground improvement device 1, and discharges the solidification material into the ground. DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0007] In the case of a ground improvement device using the chain-type mixing blade device, if the ground to be improved is made up of clayey soil with a relatively high adhesive strength or volcanic ash clayey soil (loam soil), the highly adhesive soil will remain attached, resulting in a decrease in excavation and mixing capabilities, or a large amount of soil will adhere and wrap around the entire fixed mixing blade, causing the endless chain to spin freely underground and making it impossible to mix and mix the soil, a so-called co-rotation phenomenon.

[0008] In the ground improvement device of Patent Document 1, multiple rotating blades are provided on the outer surface of the endless chain and are equipped with a frame for attaching to the endless chain, a shaft supported for rotation on the frame, and multiple stirring rods extending radially and fixed to the shaft.The multiple stirring rods extending radially and fixed to the rotatable shaft stir the soil by rotating due to the rotation of the shaft, in addition to moving as the endless chain rotates.Even if the target of ground improvement is clayey soil, etc., it is unlikely that a large amount of soil will adhere to the entire rotating blades and rotate with them, and it is said that excavation, stirring and mixing can be carried out in good conditions, but this is insufficient.

[0009] The object of the present invention is to eliminate the inconveniences of the above-mentioned conventional examples, and to provide a ground improvement device which is unlikely to cause co-rotation even when the target of ground improvement is clayey soil or other soil which is prone to co-rotation, and which can perform excavation, stirring and mixing well, and which can mix without resistance when pushing forward, and which can mix efficiently without forming lumps, thereby ensuring reliable mixing. [Means for solving the problem]

[0010] In order to achieve the above object, the present invention as set forth in claim 1 provides a ground improvement device in which a rotating agitator blade is rotatably attached to a support that hangs down from the tip of a working arm of a construction machine, the rotating agitator blade being a chain-type agitator blade device that has a driving sprocket and a driven sprocket, and an endless chain that is hung between these sprockets, and agitator blade bodies are fixed at predetermined intervals on the outer circumferential surface of the endless chain, and a third chain-type agitator blade device is provided between first and second chain-type agitator blade devices that are arranged on the left and right. The first and second chain-type agitating impeller devices are provided below the rotation support shaft on which the drive sprockets are mounted, and the rotation support shaft on which the drive sprockets of the first and second chain-type agitating impeller devices are mounted and the rotation support shaft on which the drive sprockets of the third chain-type agitating impeller device are mounted are linked by meshing of a drive gear and a driven gear, The first and second chain-type agitating blade devices and the third chain-type agitating blade device rotate in opposite directions to each other.

[0011] According to the present invention described in claim 1, mixing is performed using three chain-type agitating blade devices, namely the left and right chain-type agitating blade devices located on the outside and the chain-type agitating blade device in between, so mixing can be performed more efficiently than with a single chain-type agitating blade device, improving workability, and since the first and second chain-type agitating blade devices and the third chain-type agitating blade device rotate in opposite directions to each other, co-rotation is less likely to occur, allowing for good digging, stirring and mixing, and mixing can be performed without resistance when pushing forward, and mixing can be performed reliably without forming lumps.

[0012] Also, The first and second chain type agitating blade devices and the third chain type agitating blade device rotate in opposite directions to each other, but the force can be transmitted reliably and the device does not take up much space. Therefore, the third chain type agitating blade device 25 located between the first and second chain type agitating blade devices is rotated to perform ground improvement. It will be optimal for. [Effects of the Invention]

[0013] As described above, the ground improvement machine of the present invention is able to excavate, mix and mix well, even when the soil to be improved is clayey soil or other soil prone to co-rotation, and is therefore less likely to rotate with the soil. Moreover, it can mix without resistance when pushing forward, and can mix efficiently without forming lumps, so mixing can be carried out reliably. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a longitudinal sectional front view showing one embodiment of a ground improvement device according to the present invention. [Figure 2] 1 is a longitudinal sectional side view showing one embodiment of a ground improvement device according to the present invention. [Figure 3] 1 is an explanatory diagram showing the arrangement of sprockets in one embodiment of the ground improvement device of the present invention.

[0023] FIG. [Figure 4] 1 is a longitudinal sectional front view of a main part showing one embodiment of a ground improvement device according to the present invention. [Figure 5] 1 is a front view of a main part showing one embodiment of a ground improvement device according to the present invention. [Figure 6] 1 is a longitudinal sectional side view of a main part showing one embodiment of a ground improvement device according to the present invention. [Figure 7] 1 is a side view of a first and second chain-type agitating blade device showing one embodiment of a ground improvement device of the present invention. FIG. [Figure 8] FIG. 1 is a side view of a third chain-type agitating blade device showing one embodiment of the ground improvement device of the present invention. [Figure 9] 1 is an explanatory diagram showing the arrangement of sprockets in a main part of an embodiment of a ground improvement device according to the present invention. FIG. [Figure 10] FIG. 10 is a side view showing a conventional example. [Figure 11] FIG. 10 is a side view of a main part of a conventional example. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Figure 1 is a front view showing one embodiment of the ground improvement machine of the present invention, and Figure 2 is a side view of the same. As explained in Figure 9 above, the ground improvement machine 1 of the present invention is also used by being attached to the tip of the arm of the working device of construction machinery, and in the figure, 13 is a mounting flange for setting it on the arm of a shovel.

[0016] A hydraulic motor 15 is disposed on top of a box-shaped frame 14 serving as a support having the mounting flange 13 at its upper end, and a drive sprocket 24 is attached to the hydraulic motor 15.

[0017] A first chain-type agitating blade device 16 and a second chain-type agitating blade device 16' are arranged on the left and right sides at the bottom of the box-shaped frame 14, and a third chain-type agitating blade device 25 is arranged between them.The power of the hydraulic motor 15 is transmitted to these first and second chain-type agitating blade devices 16, 16' and the third chain-type agitating blade device 25 via a rotational drive chain (endless chain) 17.

[0018] The third chain type agitating impeller device is provided below the rotation support shaft on which the drive sprockets of the first and second chain type agitating impeller devices are provided.

[0019] The rotary drive chain 17 is stretched between a drive sprocket 24 and a lower driven sprocket 23 .

[0020] In the figure, reference numerals 22, 31, and 32 denote rotation support shafts, with rotation support shaft 22 installed at the upper level, rotation support shaft 32 at the middle level, and rotation support shaft 31 at the lower level.

[0021] The first and second chain-type agitator blade devices 16, 16' are of approximately the same type (same size and height) and are equipped with a drive sprocket 18 and a driven sprocket 19, and an endless agitator chain 20 suspended between these sprockets 18, 19, and agitator blade bodies 21 are fixed to the outer surface of the endless agitator chain 20 at predetermined intervals.

[0022] The third chain-type agitator blade device 25 is smaller (smaller and lower in height) than the first and second chain-type agitator blade devices 16, 16', and is equipped with a drive sprocket 28, a driven sprocket 29, and an endless agitator chain 30 suspended between these sprockets 28, 29, and the agitator blade bodies 21 are fixed to the outer surface of the endless agitator chain 30 at predetermined intervals.

[0023] In this embodiment, the agitating blades 21 are flat plates in the shape of paddles provided on the left and right sides or in the center of a triangular roof-shaped plate assembly, but the invention is not limited to this.

[0024] The driven sprocket 23 is fixed to the center of the rotary support shaft 22 to rotate the rotary support shaft 22, and the drive sprockets 18 of the first and second chain type agitating blade devices 16, 16' are fixed to this rotary support shaft 22.

[0025] The drive sprocket 18 is positioned above the driven sprocket 19, and the rotary drive chain 17 is wound around a driven sprocket 23 provided at the center of the rotary support shaft 22 of the drive sprocket 18 and a rotary sprocket 24 provided on the hydraulic motor 15. This rotary drive chain 17 passes through the inside of the box-shaped frame 14.

[0026] In the present invention, the first chain type agitator blade device 16 and the second chain type agitator blade device 16' are rotated in the same direction, while the third chain type agitator blade device 25 between them is rotated in the opposite direction to the first chain type agitator blade device 16 and the second chain type agitator blade device 16'.To achieve this, a drive gear 33 is fixed to the rotating support shaft 22, and a driven gear 34 that meshes with the drive gear 33 is fixed to the rotating support shaft 32, so that the rotating support shaft 32 rotates in the opposite direction to the rotating support shaft 22.

[0027] The drive sprocket 28 of the third chain-type agitating blade device 25 is fixed to the rotating support shaft 32, and the driven sprocket 29 is fixed to the rotating support shaft 31, and an endless chain 30 for agitation is stretched between the drive sprocket 28 and the driven sprocket 29.

[0028] Although not shown, the rotary shafts 22, 31, 32 are supported by bearings, and the drive gear 33 and driven gear 34, including the driven sprocket 23, are enclosed by a cover 27 to prevent soil and sand from entering.

[0029] In addition, the lower end positions of the rotation trajectories of the first and second chain-type agitating blade devices 16, 16' and the lower end position of the rotation trajectory of the third chain-type agitating blade device 25 are approximately aligned horizontally, and the gap between the first and second chain-type agitating blade devices 16, 16' and the third chain-type agitating blade device 25 is set to be as small as possible.

[0030] An injection pipe 26 for feeding the improving material was attached along the box-shaped frame 14, with its end 26a facing midway between the first and second chain-type mixing blade devices 16, 16'.

[0031] Next, to explain how to use it, when the hydraulic motor 15 is driven and the drive sprocket 24 rotates, the driven sprocket 23 rotates via the rotary drive chain 17, and the rotary support shaft 22 rotates, causing the drive sprocket 18 to rotate.

[0032] When the drive sprocket 18 rotates, the endless agitating chain 20 goes around between the drive sprocket 18 and the driven sprocket 19, causing the driven sprocket 19 to rotate, which in turn rotates the rotary support shaft 31, driving the chain-type agitating blade devices 16, 16'.

[0033] Furthermore, as the rotation support shaft 22 rotates, the drive gear 33 and driven gear 34 rotate at the same time, and the driven gear 34 rotates the rotation support shaft 32 in the opposite direction to the rotation support shaft 22, causing the drive sprocket 28 to rotate.

[0034] When the drive sprocket 28 rotates, the endless agitating chain 30 runs between the drive sprocket 28 and the driven sprocket 29, causing the driven sprocket 19 to rotate, and the third chain type agitating blade device 25 is driven. rotates.

[0035] When the arm of the construction machine's working device is lowered, the box-shaped frame 14 descends into the ground at a predetermined excavation speed, and the endless agitating chains 20 of the first and second chain-type agitating blade devices 16, 16' rotate at a predetermined rotational speed, the agitating blade bodies 21 fixed at predetermined intervals on the outer surface of the endless agitating chain 20 excavate new ground as they pass the lower end of the endless agitating chain 20, and in the process of rotating together with the endless chain 20, they mix and stir the excavated soil with solidifying material such as cement milk discharged downward from the end 26a of the injection pipe 26 to produce improved soil.

[0036] The third chain type agitating blade device 25 also rotates to excavate the ground between the first and second chain type agitating blade devices 16, 16' and agitate and mix the soil and sand.

[0037] In this way, ground improvement is carried out by rotating the first and second chain-type agitating blade devices 16, 16' on the left and right sides and the third chain-type agitating blade device 25 located between them, so the agitating blades are configured on the left, right and center, and mixing can be carried out without resistance when pushing forward.

[0038] Furthermore, the first and second chain-type agitating impeller devices 16, 16' on the left and right rotate the agitating endless chain 20 in the same vertical direction, but the third chain-type agitating impeller device 25 located between them rotates in the opposite vertical direction to the first and second chain-type agitating impeller devices 16, 16', causing the soil etc. to move vigorously, resulting in agitation without forming lumps.

[0039] In this way, the third chain type agitating blade device 25 located between the first and second chain type agitating blade devices 16, 16' rotates in the opposite direction to the left and right, so agitation is carried out reliably. [Explanation of symbols]

[0040] 1...Ground improvement equipment 2...Work vehicle 3... Movable arm 4... Solidification material supply pipe 5…Soil 6…Improved soil 10...Support body 11...Drive sprocket 12...Driven sprocket 13...Mounting flange 14...Box frame 15...Hydraulic motor 16...First chain type mixing blade device 16'...Second chain type mixing blade device 17...Rotational drive chain 18...Drive sprocket 19...Driven sprocket 20... Endless chain for stirring 21... Stirring blade body 22... Rotating support shaft 23... Driven sprocket 24... Drive sprocket 25... Third chain type mixing blade device 26...Injection pipe 26a...End part 27...Cover 28...Drive sprocket 29...Driven sprocket 30...Agitator endless chain 31... Rotating support shaft 32... Rotating support shaft 33...Drive gear 34...Driven gear 43... Endless chain 44... Rotating blade

Claims

[Claim 1] In this ground improvement device, a rotating agitator blade is rotatably attached to a support suspended from the tip of the working arm of a construction machine. The rotating agitator blade is a chain-type agitator blade device having a drive sprocket, a driven sprocket, and an endless chain suspended between these sprockets, with agitator blade bodies fixed at a predetermined interval on the outer surface of the endless chain. A third chain-type agitator blade device is located between the first and second chain-type agitator blade devices, positioned on the left and right, below the rotating support shaft on which the drive sprockets of the first and second chain-type agitator blade devices are mounted. The rotating support shaft on which the drive sprockets of the first and second chain-type agitator blade devices are mounted and the rotating support shaft on which the drive sprocket of the third chain-type agitator blade device are mounted are linked by the meshing of the drive gear and the driven gear, and the first and second chain-type agitator blade devices and the third chain-type agitator blade device rotate in opposite directions to each other.

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