JP3404469B2 - Ground improvement equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement device for improving ground by agitating and mixing a solidifying material such as cement or lime with soil while excavating the ground as a foundation work for a structure or the like. The present invention relates to a ground improvement apparatus having a construction machine such as a backhoe as a mother machine (base machine) and a trencher for excavating and stirring the ground at the arm tip.

[0002]

2. Description of the Related Art A ground improvement device of this type is known, for example, as disclosed in Japanese Unexamined Patent Publication (Kokai) No. 11-152740, in which a backhoe is a mother machine and a double chain type trencher is provided at the end of an arm. Has been. Then, the trencher winds two endless chains between the drive side chain sprocket and the driven side chain sprocket that make a pair above and below the frame, and also provides a plurality of stirring blades on the outer circumference of each chain. By excavating two chains simultaneously in the ground, soil excavation and agitation processing are performed.

[0003]

In such a conventional ground improvement device, since the two chains arranged in parallel are simultaneously driven, the tension roller of the chain sprocket and the chain tensioner is inevitably inevitable. Each machine element such as etc. must be independent for each chain, and as a result there are many consumable parts that mainly make rotational movements, cost increase is inevitable, and maintenance man-hours such as lubrication also increase. Not preferable.

Further, since foreign matters such as stones are likely to be caught between the chains, and troubles such as the chain coming off frequently due to the foreign matters being caught, there is still room for improvement in practical use. ing.

The present invention has been made in view of these problems, and in particular, consumable parts and maintenance man-hours are reduced as much as possible to reduce the overall cost while eliminating troubles such as chain disengagement. It is intended to provide a ground improvement device capable of ensuring a work amount equal to or higher than the conventional one.

[0006]

According to a first aspect of the present invention, there is provided a ground improvement device in which a predetermined construction machine is used as a mother machine and a trencher for excavating and stirring the ground is attached to an end of an arm thereof. Is a single endless chain with multiple stirring blades around the outer circumference between the drive wheel at the top of the frame and the driven wheel at the bottom of the frame.
Excavated soil by causing the chain to orbit driven in the ground, while being configured to stir, at least the driven wheel side, directly orbital movement of the stirring blades on both sides across the driven wheel It is characterized in that a lower guide member for guiding the target is provided.

The drive wheel needs to be a chain sprocket, but the driven wheel side does not necessarily have to be a chain sprocket, and may have a pulley shape as long as it has a function of guiding the chain.

The invention described in claim 2 is the same as claim 1.
A pair of driven wheels that share one chain are arranged in parallel at the lower part of the frame in the invention described in (1), and lower guide members are provided on both sides of each driven wheel.

The lower guide member in the invention described in claims 1 and 2 may be of a fixed-position type or a rolling element type such as a roller or a pulley.

Further, the invention according to claim 3 is that the lower guide member in the invention according to claim 1 or 2 is located on both sides of the driven wheel so as to be positioned on the same axis as the driven wheel. It is characterized by being a rotatable guide wheel arranged.

Therefore, although the inventions according to claims 1 to 3 are basically driven by a single chain in order to reduce the number of consumable parts, the work amount is equal to or more than that of the conventional one. Inevitably, the stirring blade becomes significantly larger than the width dimension of the chain and protrudes greatly on both sides of the chain. Therefore, at least in the lower part of the frame, the driven wheel guides the chain itself, while lower guide members or guide wheels arranged on both sides of the chain guide both ends of each stirring blade. As a result, it becomes possible to equip a stirring blade having a large width dimension while being driven by a single chain, and it is possible to secure a necessary and sufficient amount of work. At the same time, the lower guide member or the guide wheel on the left and right makes it difficult for the chain to separate from the driven wheel.

According to a fourth aspect of the present invention, the upper guide for guiding the orbiting motion of the stirring blade on both sides of the drive wheel is also provided on the drive wheel side of the invention according to any one of the first to third aspects. It is characterized in that a member is provided.

Therefore, in the invention according to the fourth aspect, the same function as that of the lower guide member is also exerted by the upper guide member.

According to a fifth aspect of the present invention, in the invention according to the fourth aspect including upper and lower guide members, either one of the lower guide member and the upper guide member is rotatable (the guide wheel is The other is a fixed-position guide ring.

The invention according to claim 6 is characterized in that both the lower guide member and the upper guide member are rotatable members.

If both the lower guide member and the upper guide member are fixed in position, the abrasion and noise may occur due to the sliding with the stirring blade.

Therefore, it is the invention described in claims 5 and 6 that pays attention to this point, and in the inventions described in claims 5 and 6, wear and irregularities are maintained while maintaining the guide effect of the stirring blade. It becomes possible to suppress the generation of sound.

According to a seventh aspect of the invention, the frame according to any one of the first to sixth aspects applies tension to the tension side and the slack side of the chain between the drive wheel and the driven wheel. It is characterized in that it is equipped with a chain tensioner.

In this case, the tension roller of the chain tensioner on the tension side and the tension roller of the chain tensioner on the slack side are supported by a common support body, and this support body is used. It is desirable that the tension roller on the tension side and the tension roller on the loose side are interlocked with each other by being slidably supported with respect to the frame.

Therefore, according to the invention described in claim 7,
By applying a predetermined tension on both the tension side and the slack side of the chain, the tensile force applied to the chain is reduced even if foreign matter such as stones is caught between the driven wheel and the chain itself. This prevents the chain from coming off and prevents the chain from breaking. These functions are similarly exhibited even if the chain is reversely driven.

In particular, when the tension rollers of both chain tensioners interlock with each other as in the eighth aspect of the invention, the above functions such as preventing the chain from coming off become more prominent.

The invention according to claim 9 is characterized in that the frame according to any one of claims 1 to 8 is provided with a wiping means for removing mud adhering to the stirring blade. . As the wiping means, for example, a wire brush or a comb-like means is used, and it is set so that the stirring blades attached to the chain periodically come into contact with the rotation of the chain.

Therefore, in the invention according to the ninth aspect, the stirring blade attached to the chain regularly comes into contact with the wiping means, so that the mud or the solidifying material adhering to the stirring blade forms the wiping means. It is wiped off by contact.

The invention described in claim 10 is the invention according to claims 1 to 9.
The stirring blade according to any one of the inventions is characterized in that a cutting blade is provided.

Therefore, according to the tenth aspect of the invention, since the cutting and stirring effects by the cutting blade are exerted in addition to the excavation and stirring effects by the stirring blade, the excavated soil does not become lumps and is uniformly distributed with the solidifying material. You can mix.

The invention described in claim 11 is characterized in that a projection member is provided on the back side of the stirring blade in the invention described in claim 10.

Therefore, in the invention according to the eleventh aspect, the protruding member exerts the function of eliminating the untreated soil attached to the back side of the chain, while it becomes easy to form a space in the agitated soil and solidifies with the soil. Mixing with wood becomes smoother.

The invention described in claim 12 is the invention according to claims 1 to 1.
The stirring blade according to the invention described in any one of 1 above is characterized in that the blade main body is provided with side cutters on both end faces in the longitudinal direction, which are sufficiently larger in width and height than the blade main body.

Therefore, in the invention according to the twelfth aspect, since the positions of the side cutters at both ends of the wing body correspond to both ends of the soil improving portion, the soil is cut by the side cutters and the soil improving portion is cut. The boundary between the unmodified area and the unmodified area becomes clear, and at least the soil in the improved area can be evenly mixed and mixed.

The invention according to claim 13 is the invention according to claims 1 to 1.
In the stirring blade according to the invention described in any one of 2 above, a plurality of cutting blades are obliquely arranged on the front surface of the blade main body, and the cutting blades are arranged in a staggered manner between adjacent stirring blades. It is characterized by

Therefore, in the invention according to the thirteenth aspect, the soil meanders in the width direction of the stirring blade due to the zigzag arrangement of the slanting cutting blades in the process in which the plurality of stirring blades orbits together with the drive chain. The quality of agitation and mixing of the improved soil is further improved because it moves. In particular, when the side cutter according to the invention of claim 12 is used together, the above effect becomes more remarkable.

The present invention as set forth in claim 14 is based on the invention as set forth in claim 13, and the excavated earth and sand is mixed in a plurality of stirring blades mounted on one drive chain. It is characterized in that at least one special agitating blade having a scraper that moves toward the central portion in the longitudinal direction is provided on the front surface of the blade main body. In order to evenly mix the special stirring blades among the plurality of stirring blades mounted on one drive chain, it is desirable to include a plurality of the special stirring blades.

Therefore, in the invention as set forth in claim 14, in the process in which the plurality of stirring blades orbit together with the drive chain, the soil is repeatedly arranged in the width direction of the stirring blade due to the staggered arrangement of the cutting blades. While the soil moves in a meandering manner, the soil is brought closer to the central portion in the longitudinal direction of the stirring blade due to the function of the special stirring blade, so that the quality of stirring and mixing of the improved soil is further improved.

[0034]

According to the invention described in claim 1, it is premised that the stirring blade is driven by only a single chain, but the stirring must be wider than that chain. Since the wings are guided at least by the lower guide members provided on both sides of the driven wheel at the bottom of the frame,
Compared with the conventional one, it is possible to significantly reduce the number of consumable parts that are rotating and sliding parts, and it is possible to significantly reduce the maintenance man-hour while reducing the cost of the trencher. Also, as the essential function of the single chain, foreign matter such as stones is less likely to be caught,
This has the effect of preventing problems such as the chain coming off.

In particular, according to the second aspect of the present invention, when a pair of driven wheels sharing a single chain are arranged in parallel, lower guide members are provided on both sides of each driven wheel. Therefore, the guiding effect of the lower guide member is exerted more effectively, and the movement of the stirring blade that makes a circular motion together with the chain is further stabilized.

According to the third aspect of the invention, since the rotatable guide wheel is adopted as the lower guide member, the effect of further stabilizing the movement of the stirring blade that makes a circular motion together with the chain is further improved. There is.

According to the invention described in claim 4, since the upper guide member for guiding the orbital movement of the stirring blade is provided not only on the driven wheel side but also on the driving wheel side, the stirring blade by the lower guide member is provided. The function equivalent to the guide effect is also exhibited on the drive wheel side, and there is an effect that the movement of the stirring blade that revolves together with the chain is further stabilized.

According to the fifth aspect of the present invention, it is premised that guide members are provided on both the driven wheel side and the drive wheel side, but one is a rotatable rolling element and the other is a fixed position type. Since the guide ring is used, there is an advantage that the stability of the guide effect by the rolling element and the simplification of the structure and the ease of maintenance by the guide ring can both be achieved.

According to the sixth aspect of the invention, the guide members are provided on both the driven wheel side and the drive wheel side, but both are rotatable members. The guide effect of both of these guide members is further stabilized.

According to the invention described in claim 7, since the chain tensioners are provided respectively on the tension side and the slack side of the chain, the tension of the chain can be kept constant and the excessive tension can be prevented from acting. It becomes difficult for the chain to come off, and it becomes possible to prevent the chain from breaking. Further, there is an effect that the above function is effectively exhibited even when the chain is driven in reverse. In particular, by constructing the tension rollers of both chain tensioners so as to interlock with each other, as in the invention described in claim 8, the above-mentioned effect becomes more remarkable.

According to the invention described in claim 9, since the mud, the solidifying material and the like adhering to the stirring blade are wiped off by the wiping means provided in the frame, the excavation and stirring action by the stirring blade is always stabilized. There is an effect that can be maintained.

According to the tenth aspect of the invention, since the stirring blade is provided with the cutting blade, the cutting blade can also exert the cutting and stirring effect on the soil, and the excavated soil does not become a lump. There is an effect that the mixing with the solidifying material is carried out uniformly.

According to the eleventh aspect of the invention, since the stirring blade is provided with the cutting blade and the projection member is provided on the back side of the stirring blade, the soil removing function on the back side of the chain is provided. And, the function of creating a space in the agitated soil comes to be exerted, and there is an effect that the soil and the solidifying material are mixed more smoothly.

According to the twelfth aspect of the present invention, since the boundary between the improved soil and the unimproved soil becomes clearer due to the cutting action of the side cutter, at least the agitating and mixing of the soil and the solidifying material in the improved portion is performed. The quality is further improved.

According to the thirteenth aspect of the present invention, the staggered arrangement of the cutting blades between the adjoining stirring blades allows the soil and the solidifying material to be uniformly mixed in the width direction of the stirring blades. Also, there is an effect that the quality of the improved soil and the solidifying material by stirring and mixing is further improved.

According to the fourteenth aspect of the present invention, since the special stirring blade that positively collects the improved soil in the central portion is included among the plurality of stirring blades, the cutting blades having the staggered arrangement are provided. When used together with the special stirring blade, there is an effect that the degree of improvement in the stirring and mixing quality of the improved soil and the solidifying material becomes more remarkable.

[0047]

1 to 4 are views showing a preferred first embodiment of a ground improvement device according to the present invention. As shown in FIG. 1, a backhoe 1 which is a construction machine is a mother machine (base machine). A chain-driven trencher 3 for excavating and stirring soil is attached to the tip of the arm 2.

2 and 3 are a front explanatory view and a side explanatory view showing details of the trencher 3, and a frame 4 which is the main body of the trencher 3 has a substantially prismatic pillar portion 5.
And a pair of left and right side plates 6 joined to the upper ends of the support columns 5, and the left and right side plates 6, 6
With a top plate 7 connecting the two, a bifurcated clevis 8 joined to the top plate 7, and a pair of left and right auxiliary arms 9 and 10 obliquely extending from the lower end of the column 5. As shown in FIG. 1, the clevis 8 of the frame 4 is detachably connected to the arm 2 of the backhoe 1.

A pair of brackets 11 and 12 are erected between the side plates 6 and 6, and a drive side chain sprocket (drive wheel) 14 integral with the drive shaft 13 is provided on these brackets 11 and 12. Are rotatably supported by bearing units 15 and 16 in a double-supported manner. A hydraulic motor 17 is attached to the outer side of one of the brackets 11 as a rotational drive means, and the hydraulic motor 17 rotationally drives the drive-side chain sprocket 14.
As the hydraulic motor 17, a motor capable of forward / reverse driving is adopted.

Further, between the respective auxiliary arms 9 and 10 forming a pair at the lower end of the frame 4, rotary shafts 18 are laid in parallel with each other. Each rotating shaft 1
A chain roller 19 is mounted as a driven wheel in the central portion of 8, and guide rollers 20 are mounted as guide wheels or rolling elements at both ends of each rotary shaft 18 as lower guide members. The chain roller 19 and the guide roller 20 may be configured to be able to rotate independently of each other, or the chain roller 19 and the pair of left and right guide rollers 20 and 20 may be configured to be coaxial and integral with each other. . In addition, the chain roller 19
Unlike the drive-side chain sprocket 14, the drive-side chain sprocket 14 does not have teeth that mesh with the drive chain 21, which will be described later, but may be a chain sprocket type having teeth similar to those of the drive-side chain sprocket 14.

A single and endless drive chain 21 is wound between the drive side chain sprocket 14 and the chain roller 19, and the drive chain 21 orbits in response to the activation of the hydraulic motor 17. While being driven, a large number (for example, about 6 to 12) of stirring blades 22 are mounted on the outer periphery of the drive chain 21 at a predetermined pitch.
As shown in FIG. 4, the agitating blade 22 is in the form of a rectangular flat plate having a length sufficiently longer than the width dimension, and at the lower part of the frame 4, both ends of each agitating blade 22 have guide rollers 2.
The guide roller 20 is contacted with 0 and guided by these guide rollers 20. Further, for example, four cutting blades 23 are formed on the front surface of each stirring blade 22, and projecting members 24 are integrally formed on both end portions on the back surface side.

In the facing gap between the pair of left and right side plates 6 and 6 of the frame 4, as a wiping means, a wire brush or a comb-shaped wiping brush 25 having a length equal to that of each stirring blade 22 is provided as a drive chain. 21 is provided in a straight line toward the drive chain 21
When each agitating blade 22 passes through the wiping brush 25 in accordance with the orbiting movement, the mud, the solidifying material and the like attached to the agitating blade 22 are wiped off.

The lower surface of the column 5 of the frame 4 is positioned between the pair of chain rollers 19, 19 and is bent into a substantially elbow shape for discharging a solidifying material such as cement or lime. A discharge nozzle 26 is arranged. The discharge nozzle 26 is driven by a rotary drive unit 27 such as a hydraulic motor built in the support column 5 to rotate, and even if the discharge motion is swung, the discharge nozzle 26 interferes with the pair of chain rollers 19, 19. It is set not to.

Chain tensioners 28 and 29 for applying tension to the tension side and the slack side of the drive chain 21 on both sides of the column 5 of the frame 4, respectively.
Is provided. These chain tensioners 28,
A tension roller 31 is attached to the central portion of the laminated leaf spring 30 in the longitudinal direction, and each laminated leaf spring 30 is fixedly supported by independent support plates 32. Both support plates 32, 32 are column parts. It is fixed to a common slider 33 as a support which is arranged as if it holds 5.

More specifically, each leaf spring 30 is swingably supported by the support plate 32 with the eyeball portion 30a at one end as a fulcrum, and the other end is floatingly supported by the clip 30b so as to be semi-fixed. The slider 33 connecting the support plates 32 to each other is slidable in the left-right direction in FIG. A rectangular window portion 34 is formed in the slider 33 holding the supporting column 5 as described above, and a guide block 35 protruding from the supporting column 5 side is formed in the window 34.
Since the slider 33 is slidable within the range regulated by the guide block 35 and the window portion 34, the left and right chain tensioners 28 and 29 are configured to interlock with each other. ing.

Therefore, according to the ground improvement apparatus thus constructed, as shown in FIG. 1, the hydraulic motor 17 is started while the trencher 3 is supported by the arm 2 of the backhoe 1 to drive the drive chain 21. Is orbitally driven between the drive side chain sprocket 14 and the chain roller 19. At this time, each stirring blade 22 mounted on the outer periphery of the drive chain 21 is
When the stirring blades 22 orbit the outer peripheral side of the chain roller 19, the respective stirring blades 22 are guided by the four guide rollers 20 in total.

In this state, the backhoe 1 itself is inserted into the improved soil (improved ground) G intended for the trencher 3 with the excavating ability, and at the same time, a solidifying material such as cement or lime is discharged from the discharge nozzle 26 at the tip of the trencher 3. To do. As a result, the improved soil is repeatedly dug and agitated and mixed so as to be mixed with the solidifying material.

In the process of stirring and mixing, a predetermined tension is applied by the chain tensioners 28 and 29 which are interlocked with each other on both the tension side and the slack side of the drive chain 21, and the drive chain 21 and the chain roller 19 mesh with each other. Since the guide rollers 20 are located on both sides of the part, not only is it difficult for foreign matter such as stones to be caught, but also the drive chain 21 itself is extremely unlikely to come off.

Further, since each stirring blade 22 is provided with the cutting blade 23 and the projection member 24 on the back side thereof, it is of course possible to efficiently crush the lump while loosening the excavated soil. It becomes possible to create a proper space in the dug up soil and mix it with the solidifying material evenly, and even if the soil goes around the back side of the drive chain 21, the projecting member 24 will eventually come out.
Will be eliminated by.

Further, even if the soil adheres to the stirring blade 22, it is removed by passing through the wiping brush 25 in the process of the circular movement of the stirring blade 22, so that the excavation efficiency due to the so-called clogging of the stirring blade 22 is increased. It will not cause a drop.

The above-described functions are similarly exerted even when the drive chain 21 is driven in the reverse direction as required. Particularly, both chain tensioners 28 and 29 are interlocked with each other, and Since appropriate tension is applied to both the loose side and the reverse side, it is not necessary to pay attention to the tight side and the loose side of the drive chain 21.

FIGS. 5 and 6 are views showing a second preferred embodiment of the ground improvement device according to the present invention, in which an upper guide member 41 for guiding the stirring blade 22 is also provided on the upper part of the frame 4 and the above. Solidifying material ejector 4 corresponding to ejection nozzle 26
The structure of 2 is different from that of the first embodiment. It is to be noted that, in FIGS. 5 and 6, parts common to those of the first embodiment shown in FIGS. 2 and 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 5 and 6, a pair of left and right side plates 6 and 6 forming a part of the frame 4 are curved and formed in a substantially arc shape as fixed-position fixed upper guide members. A guide ring 41 having a predetermined width is welded and fixed to each. The position and the radius of curvature of the upper half outer peripheral surface of each guide ring 41 are determined by the drive chain 21.
The agitating blades 22 fixed to the inner peripheral surface of the agitating blades 22 are matched with the orbital movement loci of the agitating blades 22. Instead, it is also guided by the guide ring 41 as the upper guide member.

On the other hand, the solidified material dispenser 42 has a flat rectangular chamber 43 whose lower end opens as a discharge port while its cross-sectional area gradually decreases toward the bottom.
And a receiver tank 44 arranged on both sides of the chamber 43, the receiver tank 44 is provided with a compressed air sent from an air pressure source (not shown) in order to stably supply compressed air necessary for discharging the solidified material. It has a function of temporarily storing air and then supplying it to the discharge port. The solidifying material ejector 42 accelerates the powdery solidifying material that has been pressure-fed to the chamber 43 by a pressure-feeding pipe or the like (not shown) while diffusing it throughout the entire longitudinal direction of the chamber 43, and further, further, the receiver tank. The solidified material is discharged with compressed air supplied from 44 to the discharge port.

Therefore, according to the second embodiment, the plurality of stirring blades 2 mounted on the drive chain 21 are
In the process in which 2 travels along with the drive chain 21, the stirring blade 22 is guided by the plurality of guide rollers 20 on the lower side of the frame 4, and the stirring blade 22 is guided by the pair of left and right guide rings 41 on the upper side of the frame 4. Therefore, the orbital motion of each stirring blade 22 is performed more stably.

7 and 8 are views showing a third preferred embodiment of the ground improvement device according to the present invention. Instead of the guide ring 41 on the upper part of the frame 4 in the second embodiment, the upper guide member is replaced with the guide ring 41. An upper guide roller 46, which is a rolling element, is provided.

That is, a pair of right and left roller brackets 45 curved and formed in a substantially U-shape are welded and fixed at the same position as the guide ring 41, and at the top of each roller bracket 45, an upper guide roller as a rolling member serving as an upper guide member. 46 and the upper guide roller 46 holds the respective stirring blades 22 that move in an orbit with the drive chain 21.
It is designed to guide both ends of.

Therefore, according to the third embodiment, the agitating blade 22 that revolves together with the drive chain 21 has a plurality of guide rollers 2 on the lower side of the frame 4.
0, and the upper side of the frame 4 is guided by a pair of left and right upper guide rollers 46, and both guide members roll with the orbital movement of the stirring blade 22. The orbital motion of 22 is performed more stably and smoothly.

FIGS. 9 and 10 are views showing a fourth preferred embodiment of the ground improvement device according to the present invention. As is clear from comparison with the second preferred embodiment shown in FIGS. 4 As a lower guide member of the lower part, a fixed position fixed lower guide ring 47 similar to the upper guide ring 41 is used in place of the plurality of guide rollers 20, which is a difference from the second embodiment. .

As shown in FIGS. 9 and 10, at the same position as the guide roller 20, a total of four lower guide rings each having a predetermined width and curved in a substantially arc shape as a fixed position fixed lower guide member. 47 are arranged. These lower guide rings 47 are welded and fixed to the lower ends of the support columns 5 forming a part of the frame 4 so as to be substantially concentric with the chain rollers 19, and the outer peripheral surface of the upper half portion of each lower guide ring 47. The position and the radius of curvature are matched with the orbit of the inner peripheral surface of the stirring blade 22 fixed to the drive chain 21. Therefore, each agitating blade 22 that revolves together with the drive chain 21 is guided not only by the fixed-position guide ring 41 that functions as an upper guide member but also by the fixed-position lower guide ring 47 that is a lower guide member. It has become so.

Therefore, according to the fourth embodiment, the stirring blades 22 to be orbitally moved together with the drive chain 21 are fixed at fixed positions in the upper and lower positions of the frame 4 and the lower portion of the guide ring 41. Induction ring 4
7 and the upper and lower guide members do not move. For example, the guide roller 20 and the upper guide roller 4 are different from those of the third embodiment.
Since there are no movable parts such as 6, there is an advantage that the structure can be further simplified and the number of maintenance steps can be reduced.

Here, also in this embodiment, instead of the guide ring 41 on the upper side of the frame 4, a combination of the same roller bracket 45 and upper guide roller 46 as in FIGS. The intended purpose can be achieved. The lower guide ring 47 may be the same as the upper guide roller 46.

FIG. 11 shows a modified example of the combination of the stirring blades 22 shown in FIG. 4, and a total of eight stirring blades 48-5.
One endless drive chain 2 to which 5 is attached
1 shows a state in which 1 is cut and expanded.

As shown in FIG. 11, in this example, a total of eight stirring blades 48 to 55 of four types are arranged in a straight line, and more specifically, while stirring soil, Three types of stirring blades 50 to 52 and 5 mainly for soil cutting are respectively provided between two special stirring blades 48 and 49 having a function of positively gathering soil to the central portion.
3 to 55 are arranged. Two special stirring blades 48, 4
As shown in FIGS. 13 to 15, reference numeral 9 denotes a flat plate-shaped blade body 5.
The width and height of the blade body 5 on both end surfaces of
6 is provided with a side cutter 57 which is sufficiently larger than 6 and a substantially V-shaped scraper 58 is provided on the front surface of the wing body 56 so as to be adjacent to the side cutter 57. It has a function of positively gathering the improved soil to the central portion of the special stirring blade 48 or 49 along with the effect of stirring or kneading the soil regardless of the direction of rotation.

Incidentally, three auxiliary blades 56a are mounted on the front surface of the wing main body 56, and a backing plate 56b is mounted on the rear surface side together with the projection member 24.

On the other hand, four types of stirring blades 50 to 55 mainly for soil cutting are shown in FIG. 16 to FIG.
16 to 19 representatively show the structure of the stirring blade 54), as shown in FIG.
Side cutters 57 are provided on both end surfaces of the blade, and two or three cutting blades 59, 6 are provided on the front surface of the blade body 56.
0 or 61, 62 are arranged in a slanting shape, and the so-called staggered arrangement is adopted so that the inclinations of the cutting blades 59, 60 or 61, 62 in the adjacent stirring blades 50 to 55 are opposite to each other. There is. Incidentally, three auxiliary blades 56a are mounted on the front surface of the wing main body 56 as described above, and a backing plate 56b is mounted on the rear surface side together with the protruding member 24.

Therefore, the stirring blade 48 having such a combination is provided.
When ~ 55 is used, a total of eight stirring blades 48-55 are used.
In the process of orbiting with the drive chain 21,
By the cutting action of each side cutter 57, the soil improvement target area and the unimproved area are clearly separated, and the excavated and agitated soil is further cut by each cutting blade 59, 60 or 6.
1, 62, the blade body 56 is positively repeatedly meandered in the width direction, while the scraper 58 of the special agitating blades 48, 49 functions to make the blade body 56.
Since the soil in the improvement target area is uniformly stirred and mixed together with the solidifying material, the quality of the improved ground (soil) is further improved.

20 and 21 are views showing a fifth preferred embodiment of the ground improvement device according to the present invention, in which the mud truck 71 having a self-propelling ability is used as a mother machine and the mud truck 71 is shown in FIGS.
The trencher 3 shown in FIG.

In the fifth embodiment, the mud truck 71
Includes a lift drive mechanism 72 capable of moving the trencher 3 up and down, and a traverse drive mechanism 73 capable of moving the trencher 3 including the lift drive mechanism 72 in the vehicle width direction. There is an advantage that the soil improvement work of a larger area can be performed while the carriage 71 is stopped at the fixed position.

FIG. 22 is a view showing a sixth preferred embodiment of the ground improvement device according to the present invention, in which the mud truck type backhoe 81 is used as a mother machine and the arm 82 is provided with the trencher shown in FIGS. It is needless to say that the same function as that of the fifth embodiment described above is exerted by wearing the No. 3 attached.

In the fifth and sixth embodiments as well, instead of the trencher 3 shown in FIGS.
It goes without saying that other types of trenchers 3 shown in FIG. 10 can be used.

[Brief description of drawings]

FIG. 1 is an overall configuration explanatory view showing a first preferred embodiment of a ground improvement device according to the present invention.

2 is a front explanatory view of the trencher shown in FIG. 1. FIG.

3 is a left side view of the trencher shown in FIG.

4A and 4B are views showing details of the drive chain shown in FIGS. 2 and 3, where FIG. 4A is a front explanatory view, FIG. 4B is a plan explanatory view of FIG. 4A, and FIG. FIG.

FIG. 5 is a view showing a second preferred embodiment of the ground improvement device according to the present invention, and is a front explanatory view of a trencher.

6 is a left side view of the trencher shown in FIG.

FIG. 7 is a view showing a third preferred embodiment of a ground improvement device according to the present invention, and is a front explanatory view of a trencher.

FIG. 8 is a left side view of the trencher shown in FIG.

FIG. 9 is a view showing a fourth preferred embodiment of a ground improvement device according to the present invention, and is a front explanatory view of a trencher.

10 is a left side view of the trencher shown in FIG.

FIG. 11 is a view showing a modified example of the stirring blade in FIG. 4, and a configuration explanatory view when the drive chain is cut and developed.

FIG. 12 is an enlarged front view showing details of the special stirring blade shown in FIG. 11.

13 is a plan view of FIG.

14 is a right side view of FIG.

FIG. 15 is a cross-sectional view taken along the line AA of FIG.

16 is an enlarged front view showing details of the stirring blade shown in FIG.

FIG. 17 is a plan view of FIG.

FIG. 18 is a right side view of FIG. 16.

FIG. 19 is a sectional view taken along the line BB of FIG.

FIG. 20 is an explanatory diagram showing a fifth embodiment of a ground improvement device according to the present invention.

FIG. 21 is a left side view of FIG. 20.

FIG. 22 is an explanatory diagram showing a sixth embodiment of a ground improvement device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Backhoe (mother machine) 2 ... Arm 3 ... Trencher 4 ... Frame 14 ... Drive side chain sprocket (drive wheel) 17 ... Hydraulic motor (rotational drive means) 19 ... Chain roller (driven wheel) 20 ... Guide roller (lower guide member) (Induction wheel or rolling element) 21 ... Drive chain 22 ... Stirring blade 23 ... Cutting blade 24 ... Projection member 25 ... Wiping brush (wiping means) 26 ... Discharge nozzle 28 ... Chain tensioner 29 ... Chain tensioner 30 ... Leaf spring 31 ... Tension roller 33 ... Slider (support) 41 ... Guide ring (upper guide member) 46 ... Upper guide roller (upper guide member (rolling body)) 47 ... Lower guide ring (lower guide member) 48, 49 ... Special stirring blade 50-55 ... Stirring blade 57 ... Side cutter 58 ... Scraper 59-62 ... Cutting blade

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-144262 (JP, A) JP-A-9-143980 (JP, A) JP-A-11-152740 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) E02D 3/12 102 E02F 5/06

Claims (14)

(57) [Claims] 1. A ground improvement device having a predetermined construction machine as a mother machine and a trencher for excavating and agitating the ground at its arm tip, wherein the trencher is a drive wheel above the frame and a driven wheel below the frame. Between and, a single endless chain equipped with a plurality of stirring blades is wound around the outer circumference, and the chain is driven to orbit in the ground to excavate and stir the ground, while at least the driven wheel, soil improvement apparatus characterized by lower guide member is provided to directly guide the orbital movement of the stirring blades on both sides across the driven wheels. 2. A pair of driven wheels, which share a chain, are arranged in parallel at a lower portion of the frame, and lower guide members are provided on both sides of each driven wheel. Item 1. The ground improvement device according to item 1. 3. The lower guide member is a rotatable guide wheel disposed on both sides of the driven wheel so as to be located on the same axis as the driven wheel. Alternatively, the ground improvement device described in 2. 4. The upper guide member for guiding the orbital motion of the stirring blade is also provided on both sides of the drive wheel with the drive wheel interposed therebetween. The ground improvement device described in. 5. The ground improvement according to claim 4, wherein one of the lower guide member and the upper guide member is a rotatable rolling element, and the other is a fixed-position guide ring. apparatus. 6. The lower guide member and the upper guide member are both rotatable members.
The ground improvement device described in. 7. The chain tensioner for applying tension to the tension side and the slack side of the chain between the drive wheel and the driven wheel is provided on the frame, respectively. The ground improvement device according to any one of the above. 8. The tension roller of the tension side chain tensioner and the tensioner roller of the slack side chain tensioner are supported by a common support body, and the support body is slidably supported on the frame. The tension roller on the tension side and the tension roller on the loose side are thereby interlocked with each other.
The ground improvement device described in. 9. The ground improvement device according to claim 1, wherein the frame is provided with a wiping means for removing mud attached to the stirring blade. 10. The ground improvement device according to claim 1, wherein the stirring blade is provided with a cutting blade. 11. The ground improvement device according to claim 10, wherein a protrusion member is provided on the back side of the stirring blade. 12. The stirring blade according to claim 1, wherein side edges of the blade main body in the longitudinal direction are provided with side cutters having a width dimension and a height dimension which are sufficiently larger than those of the blade main body. The ground improvement device according to any one of the above. 13. The stirring blade has a plurality of cutting blades arranged obliquely on the front surface of the blade body, and the cutting blades are arranged in a staggered manner between adjacent stirring blades. The ground improvement device according to any one of claims 1 to 12. 14. At least one special stirring blade equipped with a scraper for gathering excavated earth and sand to a central portion in the longitudinal direction of the stirring blade among a plurality of stirring blades mounted on one drive chain, on the front surface of the blade main body. The ground improvement device according to claim 13, further comprising: