JP3793734B2 - Ground improvement device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ground improvement device for improving the ground by stirring and mixing solidified materials such as cement and lime and soil while excavating the ground prior to the foundation work of a structure or the like, and in particular, a construction machine such as a backhoe. In the ground improvement device of the type in which the construction head is attached to the machine as a base machine (base machine), the present invention relates to a structure of a stirring blade to be attached to a chain that is driven around.
[0002]
[Prior art]
As this type of technology, for example, as described in Japanese Patent Application Laid-Open No. 11-336067, a construction head called a trencher type is supported on the tip of an arm of a construction machine such as a backhoe, and the construction head A chain having a plurality of stirring blades is wound around and supported between the driving wheel and the driven wheel, and the chain is driven to rotate in the ground, thereby stirring and mixing while excavating the ground with the stirring blade. There is something like that. The construction head includes a solidifying material discharge means, and the solidifying material is charged in parallel with the excavation and the stirring and mixing process.
[0003]
[Problems to be solved by the invention]
In the ground improvement method using such a chain loop drive system, the chain rotation direction is switched at an appropriate timing, and the forward rotation and reverse rotation are repeated several times for further uniform ground improvement quality. It is preferred.
[0004]
However, in the conventional ground improvement device, it is not considered to forward and reverse the chain, especially because the structure of the stirring blade is a shape that is presumed to be driven in a specific direction along with the chain, not only can not be performed sufficiently stirring and mixing in the case of reversed chain, earth pressure resistance applied to the stirring blade becomes extremely large, and Re emesis not achieve the intended purpose.
[0005]
The present invention has been made paying attention to such a problem. In particular, even when the agitating blade mounted on the chain is positively or reversely driven, whether the forward rotation or the reverse rotation is performed. In any case, an object of the present invention is to provide a structure of a stirring blade capable of performing a sufficient stirring and mixing process.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 includes a construction head attached to the arm tip of the mother machine, and the construction head wraps an endless chain between a driving wheel at the upper part of the frame and a driven wheel at the lower part of the frame, A ground improvement device in which a plurality of stirring blades are attached to a chain at a predetermined pitch, and these stirring blades are moved together with the chain in the ground to excavate the ground and perform the stirring and mixing process. The stirrer blade is formed by projecting a plurality of cutting blades having sharp cutting edges on both sides in the circumferential direction at a substantially right angle through the blade mounting plate with respect to the blade substrate that is substantially perpendicular to the construction ground. , together with the size of each part of the cutting blade is set so as to satisfy the following conditions (a) ~ (e), the shape of the cutting blade itself and stirring blade, the chain circumferential direction Characterized in that it is formed symmetrically to the center line that will bisect the stirring blade as the symmetry center.
(A) The relationship between the blade width dimension b2 formed by the cutting edges in the circumferential direction of the cutting blade and the width dimension b1 on the root side is b2> b1.
(B) The relationship between the blade thickness dimension c2 in the direction orthogonal to the blade width direction of the cutting blade and the thickness dimension c1 of the blade mounting plate is c2> c1.
(C) The relationship between the effective blade length d1 of the cutting blade and the blade thickness dimension c2 is d1> c2.
(D) The relationship between the blade width dimension b2 between the cutting edges and the blade thickness dimension c2 in the circumferential direction of the cutting blade is b2> c2.
(E) The relationship between the width dimension b11 in the circumferential direction of the blade mounting plate and the blade width dimension b2 in the circumferential direction of the cutting blade is b2> b11.
[0007]
Here, as described above, the cutting blade itself and the shape of the stirring blade are formed symmetrically with the center line that bisects the stirring blade in the chain circumferential direction as the center of symmetry. This is so that the same amount of work can be obtained both in the case of reverse rotation and in the case of reverse rotation .
[0008]
Here, the construction head as a base body may be of any type as long as it is of a type in which the stirring blade mounted on the chain is moved around with the chain. Moreover, all necessarily its as a plurality of stirring blades mounted on the same chain need not be of the same shape, as long as satisfying the placing serial to claim 1, those plurality of kinds of different shapes You may mix.
[0009]
In addition, as described in claim 2, it is more desirable for the cutting blade to have a recess formed in the center portion of the blade width in the circumferential direction in terms of reducing earth pressure resistance.
[0011]
The invention described in claim 3 is based on the premise described in claim 1 or 2 for the purpose of improving the stirring and mixing performance, and the kneading blade inclined at a predetermined angle with respect to the circumferential direction is a blade, separately from the cutting blade. It is attached to the substrate.
[0012]
Further, the invention according to claim 4 is based on any one of claims 1 to 3 so that both ends in the longitudinal direction of the stirring blade can be used, for example, so as to be applicable to ultra-soft ground. The blade substrate is curved so as to protrude outward or inward from the central portion.
[0013]
In order to improve the stirring and mixing performance of the construction head as a whole, the invention described in claim 5 is based on the premise of any one of claims 1 to 4, and the length in the longitudinal direction of the stirring blade is different. A plurality of types are mixed, and the stirring blades are arranged so that the length of the stirring blades increases or decreases stepwise in the chain circulation direction.
[0014]
Further, the invention according to claim 6, based on the similar to those of claim 5 purpose, on the assumption the description of any of claims 1 to 5, between the drive wheel and the driven wheel two When the chain is wound over the rows, the stirring blades between the two chains are positioned so that the stirring blades attached to the other chain are located between the arrangement pitches of the stirring blades attached to one chain. The arrangement is characterized by alternating arrangement.
[0015]
Thus, whether in the invention according to claims 1 to 6, if reversed with the case of each stirring blade is rotated forward with chains and not any difference in the stirring and mixing performance in a reverse or a forward Regardless of this, the same stirring and mixing process can be performed. In particular, in the invention described in claim 3, by disposing a kneading blade different from the cutting blade in an inclined direction with respect to the circumferential direction, the earth pressure resistance increases with an increase in the projected area in the circumferential direction. However, it is more advantageous in improving the stirring and mixing performance.
[0016]
【The invention's effect】
According to the first aspect of the present invention, when the chain is driven to rotate in the forward direction and the reverse direction, each stirring blade has the same work amount, that is, the same work amount regardless of whether it is forward rotation or reverse rotation. In addition to further improving the mixing efficiency and ground improvement quality, the cutting blades of the cutting blades are formed with a sharp angle in advance. It is easy to maintain the shape and it can be expected to extend its life. Moreover, there is an advantage that the earth pressure resistance is not increased by making the blade mounting plate substantially narrower than the cutting blade.
[0017]
According to the second aspect of the present invention, since the concave portion is formed in the central portion of the blade width in the circumferential direction of the cutting blade, the earth pressure resistance can be further reduced.
[0019]
According to the invention described in claim 3, by arranging the kneading blade different from the cutting blades so as to be inclined with respect to the rotating direction, the projected area in the rotating direction corresponding to the kneading blade is increased. Therefore, the stirring and mixing performance is further improved.
[0020]
According to the invention described in claim 4, since the blade substrate itself to which the cutting blade is attached has a curved shape, for example, when the ground to be improved is an extremely soft ground such as a wetland, the stirring blade is a soil. This makes it easier to capture and improves the stirring and mixing performance.
[0021]
According to the invention described in claim 5, a plurality of types having different stirring blade lengths are mixed, and the stirring blades are arranged so that the length of the stirring blades increases or decreases stepwise in the chain circumferential direction. Therefore, the cutting blades oscillate substantially in the width direction of the processing width without the cutting blades always passing through the same position, which can contribute to further improvement of the stirring and mixing performance and uniform processing quality.
[0022]
According to the sixth aspect of the present invention, when the chain is wound in two rows between the driving wheel and the driven wheel, the other chain is arranged between the arrangement pitches of the stirring blades attached to the one chain. Since the stirrer blades are arranged alternately between the two chains so that the stirrer blades to be mounted are located, there is an advantage that it can contribute to further improvement of the stirring and mixing performance and uniform processing quality as described above. is there.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
1 and the following drawings show a preferred embodiment of the ground improvement device according to the present invention.
[0024]
As shown in FIGS. 1 and 2, the ground improvement device 1 is formed by using a backhoe 2, which is a construction machine, as a base machine (base machine), and a so-called trencher for excavating and mixing the soil at the tip of the arm 3. A so-called chain drive type construction head 4 is detachably mounted.
[0025]
The construction head 4 wraps an endless drive chain 8 between a drive wheel 6 such as a chain sprocket at the upper part of the frame 5 and a driven wheel 7 such as a chain sprocket at the lower part of the frame 5, and the outer periphery of the drive chain 8 is shown in FIG. As shown in FIG. 2, a plurality of stirring blades 9 are mounted at an equal pitch, and each stirring blade 9 is provided with a plurality of cutting blades (cutters) as described later. Further, a solidifying material discharge device (not shown) is provided at the front end of the frame 5 so that, for example, a powdery or slurry-like solidifying material that has been pumped by a cloud pump or the like is discharged.
[0026]
Then, by starting the hydraulic motor 10 provided at the upper part of the frame 5, each stirring blade 9 moves around together with the drive chain 8, and at the same time, the construction head 4 itself penetrates into the ground by the thrust of the backhoe 2. As a result, the agitation and mixing with the solidifying material is performed while excavating the soil.
[0027]
FIG. 3 shows the details of the agitating blade 9. FIG. 3A is a plan view thereof, FIG. 3B is a front view of FIG. 1A, and FIG. Sectional views along the aa line of B) are shown respectively.
[0028]
As shown in FIGS. 3A to 3C, a plurality of (five in the illustrated example) cutting blades 12 are substantially upright on the surface side of the flat blade substrate 11 along the longitudinal direction thereof. Projecting. Each cutting blade 12 is formed in a substantially flat inverted trapezoidal shape, and acute cutting edges 12a are formed at both ends in the circumferential direction. Each cutting blade 12 is fixed to the blade substrate 11 by welding via the blade mounting plate 13 in order to secure the blade edge (height from the blade substrate 11 to the cutting blade 12a) to some extent. The width dimension b11 (= width dimension b1 on the base side of the cutting blade 12) in the circumferential direction of the mounting plate 13 is smaller than the blade width dimension (dimension formed by the cutting edges 12a and 12a) b2 of the cutting blade 12. (B2> b1 = b11). Further, the blade width dimension b2 formed by the cutting edges 12a and 12a is set to be larger than the blade thickness dimension c2 (b2> c2), and the cutting blade 12 in the direction perpendicular to the blade width direction is set. The blade thickness dimension c2 is set to be larger than the thickness dimension c1 of the blade mounting plate 13 (c2> c1), and the effective blade length d1 of the cutting blade 12 is set to be larger than the blade thickness dimension c2. (D1> c2).
[0029]
A plurality of reinforcing plates 14 and 15 and a back blade 16 are welded and fixed to both front and back surfaces of the blade substrate 11 , and a link plate 17 that forms part of the drive chain 8 is welded to the back side. The drive chain 8 which is fixed and includes these link plates 17 and pins or the like meshes with the driving wheel 6 or the driven wheel 7 such as a chain sprocket.
[0030]
Here, the blade substrate 11 which is the main body of the stirring blade 9 is set so as to be substantially perpendicular to the construction ground G in the construction posture of the construction head 4 as shown in FIG. In addition to the 12 individual shapes, the shape of the agitating blade 9 as a whole is such that the work amount is the same when the drive chain 8 is rotated forward and when it is reversed, that is, it is forward rotation or reverse rotation. Regardless of this, the center blade C that bisects the stirring blade 9 in the chain circumferential direction is symmetric about the center line C so that the amount of displacement of the individual cutting blade 12 and the stirring blade 9 as a whole is equal. Is formed.
[0031]
According to the ground improvement device provided with the stirring blade 9 having such a structure, in the process in which the plurality of stirring blades 9 circulate together with the drive chain 8, excavation of the soil to be ground improvement and stirring and mixing with the solidified material. However, as described above, since the shape of each cutting blade 12 and the shape of the stirring blade 9 as a whole are symmetrical in the circumferential direction, the drive chain 8 is positively Even when the forward / reverse operation is performed, the work amount of each cutting blade 12 and the stirring blade 9, that is, the amount of displacement of the soil does not change at the time of forward rotation and reverse rotation, and the same earth pressure resistance is maintained. Both will get the same amount of work.
[0032]
Further, the cutting blades 12 at both ends in the longitudinal direction of the stirring blade 9 function as a so-called side cutter, and the actual construction area and the unmodified area are clearly separated by the cutting action of the cutting blade 12. In addition, since the cutting blade 12a of the cutting blade 12 has an acute-angled shape, the original function of the cutting blade 12a can be maintained for a long time even if it is worn. Since the side surface area is made smaller than the width dimension b2, the side pressure acting on the blade mounting plate 13 during construction can be reduced as much as possible to reduce earth pressure resistance.
[0033]
In addition, the back blade 16 passes through the portion closest to the solidifying material discharge port while rotating around, and the height of the back blade 16 is set so that, for example, the gap formed with the solidifying material discharge port is within about 100 mm. Is determined, the solidified material is discharged smoothly, and the solidified material is evenly distributed to the tip of the stirring blade 9, so that the stirring and mixing quality is further improved.
[0034]
4 (A) to 4 (D) show a modification of the cutting blade 12 shown in FIG. 3, each of which is the center of the blade width b2 between the cutting edges 12a and 12a (see FIG. 3 (C)). A trapezoidal or arcuate recess 18 is formed in the part, and there is an advantage that the resistance at the time of cutting the soil can be further reduced. In this case, as shown in FIG. 5, it is desirable to set the effective cutting edge H of each cutting blade 12 larger than the actual cutting depth of the soil in order to reduce the cutting resistance.
[0036]
FIGS. 6-8 shows another example of a stirring blade as 2nd-4th embodiment of this invention.
[0037]
In the second embodiment shown in FIGS. 6 (A) and 6 (B), in the form of ribs orthogonal to the adjacent cutting blades 12 and 12 at both longitudinal ends of the blade substrate 11 of the stirring blade 19. The auxiliary blade 20 protrudes, and in particular, when the hard ground is constructed, the auxiliary blade 20 contributes to improving the strength of the cutting blade 12 and smoothing the stirring and mixing, and the auxiliary blade 20 itself also exhibits a kneading function. Therefore, there is an advantage that the mixing efficiency is increased and further improvement in processing quality can be expected.
[0038]
Further, in the third embodiment shown in FIGS. 7A and 7B, separately from the plurality of cutting blades 12 and the auxiliary blades 20 forming the stirring blade 29, the blade substrate 11 is arranged in the circumferential direction. On the other hand, a plurality of kneading blades 21 inclined at a predetermined angle are provided. In the third embodiment, since the projected area in the circumferential direction is increased by the newly set kneading blade 21, the earth pressure resistance is also increased, but the stirring and mixing performance is further improved. This is particularly convenient when constructing soft ground.
[0039]
In the fourth embodiment shown in FIGS. 8A and 8B, the cutting blades 12 are provided only at both longitudinal ends of the blade substrate 31 of the stirring blade 39, and a plurality of blades 31 are provided at the central portion of the blade substrate 31. While the long auxiliary blades 32 and 33 and the kneading blade 21 are provided, the blade substrate 31 is curved so that both end portions of the stirring blade 39 are located outside the central portion. In the case of this embodiment, there is an advantage that the super-soft ground can be easily captured by the stirring blade 39 as a whole, particularly when the super-soft ground such as a wetland is constructed.
[0040]
FIG. 9 is a development view of a drive chain equipped with a plurality of stirring blades as a fifth embodiment of the present invention. In the fifth embodiment, for example, five types of stirring blades 9, 9A, 9B, 9C, and 9D with the overall length and the number of cutting blades 12 varied based on the stirring blade 9 having the structure shown in FIG. The five types of agitating blades 9, 9A, 9B, 9C, 9D are arranged in a common drive chain 8 so that the length thereof increases stepwise or decreases stepwise in the chain circumferential direction. They are aligned and installed.
[0041]
According to this embodiment, in the process in which each stirring blade 9, 9A, 9B, 9C, 9D moves around together with the drive chain 8, each cutting blade 12 does not always pass through the same position, but the stirring blade 9, Since it is in the form of positive and repeated meandering (oscillating operation) in the longitudinal direction of 9A, 9B, 9C, 9D, the stirring and mixing performance or stirring and mixing quality is further improved.
[0042]
10, 11 and 12 show a modification of the stirring blade shown in FIG. 8 as the sixth embodiment of the present invention.
[0043]
Figure stirring blade 49 shown in (A) ~ (C) of 10 is intended to the curved direction of the blade substrate 41 corresponding to the substrate of the stirring blade 39 definitive 8 Conversely, also in FIG. 11 (A) ~ The stirring blade 59 shown in (C) is obtained by changing the position and number of the kneading unit blades 21 while keeping the blade substrate 51 in a flat shape without curving. 12 (A) to 12 (C), the blade substrate 61 itself of the stirring blade 69 is bent so as to have a substantially U-shaped cross section including the auxiliary blade 62 along its longitudinal direction, and a plurality of cutting blades are formed on this. 12 is added.
[0044]
In the case of the stirring blades shown in FIGS. 10 to 12, a plurality of stirring blades having the same structure are not provided in the common drive chain 8, but a plurality of kinds of stirring blades are provided in the common drive chain, for example, as shown in FIG. The wings shall be installed in a mixed manner.
[0045]
That is, FIG. 13 is a developed view when the drive chain 8 is wound around two rows between the drive wheel 6 and the driven wheel 7 shown in FIG. 1, and a plurality of types shown in FIGS. The agitating blades 39, 49, 59, and 69 are sequentially attached to the drive chain 8 in a regular or irregular arrangement, while the agitating blades 39, 49, 59, and 69 are arranged between the two drive chains 8 and 8. , That is, any one of the stirring blades 39, 49, 59, 69 of the other drive chain 8 is positioned between the arrangement pitches of the stirring blades 39, 49, 59, 69 in one drive chain 8. Thus, the arrangement of the stirring blades 39, 49, 59, 69 in both drive chains 8, 8 is alternately arranged.
[0046]
For example, the stirring blade 39 shown in FIG. 8 is the B type, the stirring blade 49 shown in FIG. 10 is the A type, the stirring blade 59 shown in FIG. 11 is the C type, and the stirring blade 69 shown in FIG. when the sign A~D attached to each stirring blade definitive in FIG. 13 corresponds to the type of type of each stirring blade above.
[0047]
Therefore, according to this embodiment, since the drive chain 87 has two rows, it is possible to secure a larger area area that can be constructed at one time, and to contribute to further improvement of stirring and mixing performance and uniform processing quality. It will be possible.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a schematic configuration of an entire ground improvement device using a backhoe as a mother machine as a preferred embodiment of the present invention.
FIG. 2 is a schematic explanatory view showing a developed drive chain of the construction head shown in FIG.
FIGS. 3A and 3B are diagrams showing details of the stirring blades shown in FIGS. 1 and 2 as the first embodiment, wherein FIG. 3A is a plan view thereof, FIG. 3B is a front view of FIG. ) Is a cross-sectional explanatory view taken along line aa in FIG.
4A to 4D are explanatory views showing a modification of the cutting blade shown in FIG.
FIG. 5 is an explanatory diagram at the time of soil cutting by the cutting blade of FIG. 4;
6A and 6B are diagrams showing details of a stirring blade as a second embodiment, in which FIG. 6A is a plan view thereof, and FIG. 6B is a front view of FIG.
7A and 7B are diagrams showing details of a stirring blade as a third embodiment, in which FIG. 7A is a plan view thereof, and FIG. 7B is a front view of FIG.
FIGS. 8A and 8B are diagrams showing details of a stirring blade as a fourth embodiment, in which FIG. 8A is a plan view thereof, and FIG. 8B is a front view of FIG.
FIG. 9 is a development explanatory view in which a plurality of types of stirring blades are mixed in a common drive chain as a fifth embodiment.
10 is a view showing a modification of the stirring blade shown in FIG. 8 as a sixth embodiment, (A) is a plan view thereof, (B) is a front view of the same drawing (A), and (C). Is a right side view of FIG.
11 is a view showing another modification of the stirring blade shown in FIG. 8 as the sixth embodiment, FIG. 11 (A) is a plan view thereof, and FIG. 11 (B) is a front view of FIG. (C) is a right side view of FIG.
[Figure 12] is a similarly illustrates a modification of the still another stirring blade shown in FIG. 8 as a sixth embodiment of a front view of (A) is a plan view, (B) the figure (A) , (C) is a right side view of FIG.
13 is a development explanatory view of the drive chain when the stirring blades shown in FIG. 8 and FIGS.
[Explanation of symbols]
1 ... Ground improvement device 2 ... Backhoe (base machine or base machine)
4 ... construction head 5 ... frame 6 ... driving wheel 7 ... driven wheel 8 ... drive chain 9 ... stirring blade 9A, 9B, 9C, 9D ... stirring blade
DESCRIPTION OF SYMBOLS 11 ... Blade board | substrate 12 ... Cutting blade 12a ... Cutting blade 13 ... Blade | wing attachment plate 18 ... Recessed part 19 ... Stirring blade 29 ... Stirring blade 21 ... Kneading blade 31 ... Blade board 39 ... Stirring blade 41 ... Blade board 49 ... Stirring blade 51 ... Wing substrate 59 ... Stirring blade 61 ... Wing substrate 69 ... Stirring blade
b1 Width dimension
b2 ... Blade width dimension
c1 ... Thickness dimension
c2 ... Blade thickness dimension
d1 ... Effective blade

Claims (6)

The construction head has a construction head attached to the tip of the arm of the mother machine. The construction head wraps an endless chain between a driving wheel at the top of the frame and a driven wheel at the bottom of the frame, and the chain has a plurality of pitches at a predetermined pitch. A ground improvement device that is equipped with stirring blades, and that performs the stirring and mixing process together with excavation of the ground by moving these stirring blades around the ground together with the chain,
The stirring blade is formed by projecting a plurality of cutting blades having sharp cutting edges on both sides in the circumferential direction at a substantially right angle through the blade mounting plate with respect to the blade substrate that is substantially perpendicular to the construction ground.
The dimensions of each part of the cutting blade are set to satisfy the following conditions (a) to (e),
The ground improvement device characterized in that the shape of the cutting blade itself and the agitating blade are formed symmetrically about a center line that bisects the agitating blade in the chain circulation direction .
(A) The relationship between the blade width dimension b2 formed by the cutting edges in the circumferential direction of the cutting blade and the width dimension b1 on the root side is b2> b1.
(B) The relationship between the blade thickness dimension c2 in the direction orthogonal to the blade width direction of the cutting blade and the thickness dimension c1 of the blade mounting plate is c2> c1.
(C) The relationship between the effective blade length d1 of the cutting blade and the blade thickness dimension c2 is d1> c2.
(D) The relationship between the blade width dimension b2 between the cutting edges and the blade thickness dimension c2 in the circumferential direction of the cutting blade is b2> c2.
(E) The relationship between the width dimension b11 in the circumferential direction of the blade mounting plate and the blade width dimension b2 in the circumferential direction of the cutting blade is b2> b11. The ground improvement device according to claim 1, wherein the cutting blade has a recess formed in a central portion of the blade width in the circumferential direction. The ground improvement device according to claim 1 or 2, wherein a kneading blade inclined at a predetermined angle with respect to the rotating direction is attached to the blade substrate separately from the cutting blade. The ground improvement device according to any one of claims 1 to 3 , wherein the blade substrate is curved so that both end portions in the longitudinal direction of the stirring blade protrude outward or inward from the central portion. Mixing multiple types with different lengths in the longitudinal direction of the stirring blades, and arranging the stirring blades so that the length of the stirring blades increases or decreases stepwise in the chain circumferential direction. The ground improvement device according to any one of claims 1 to 4, wherein Both are arranged so that the chain is wound in two rows between the drive wheel and the driven wheel, and the stirring blade attached to the other chain is located between the arrangement pitches of the stirring blades attached to one chain The ground improvement device according to any one of claims 1 to 5, wherein the arrangement of the stirring blades between the chains is alternately arranged.

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