JP3607793B2 - Construction method of continuous ground improvement body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction method that is carried out when a continuous ground improvement body is constructed by moving a digging apparatus a plurality of times with respect to one construction section.
[0002]
[Prior art and problems to be solved by the invention]
In the method of constructing a continuous ground improvement body using a grooving device in which an endless chain is stretched around the outer periphery of the cutter post, in case the construction must be stopped halfway through one construction section, When evacuation is performed after the construction of the section is completed, for example, the ground is excavated while supplying only the drilling fluid that does not consolidate during one round trip of the section, and the solidified material liquid is supplied during the third movement. While excavating again, stirring and mixing are performed.
[0003]
The grooving device is moved by applying thrust to the upper end of the cutter post in the advancing direction while applying reaction force to the frame of the base machine located on the ground. And the thrust is not transmitted to the lower end portion of the cutter post, so that the upper end portion of the cutter post precedes the state at the start of construction, and the lower end portion tends to recede, making it impossible to construct.
[0004]
The endless chain cuts the ground in the section located on the front side in the traveling direction across the cutter post, but if the endless chain is circulated in the direction in which the section located on the front side in the traveling direction descends, the endless chain is positioned at the lower end of the cutter post. The endless chain is conventionally circulated in the direction in which the section located on the front side in the traveling direction rises, because a force opposite to the direction of rotation is applied to the idler to increase the load on the motor.
[0005]
However, if the endless chain is circulated in this direction, the cutter agitating claw scratches the ground in the direction of the progress of the digging device at the position where the endless chain changes direction from descending to rising at the lower end of the cutter post. Since the lower end portion of the cutter post is moved backward, the upper end portion of the cutter post is preceded and the lower end portion tends to recede, so that the construction efficiency is extremely lowered and the possibility that the construction is impossible is increased.
[0006]
If the endless chain is circulated in a direction in which the section located forward in the direction of travel descends, the load on the motor increases, but when the cutting agitating claw passes the lower end of the cutter post, the ground is directed in the direction opposite to the direction of travel. Since it works to advance the lower end of the cutter post by scratching it, it is possible to avoid the situation where the cutter post is inclined, but the effect is limited to the first movement, and the hole is used for the second and subsequent movements. Since the bottom portion of the ground is disturbed, even if the cutting stirring claw scratches the ground, the ground reaction force cannot be expected, and it is difficult to finally avoid the inclination of the cutter post.
[0007]
This invention is a construction method that avoids the situation in which the cutter post is inclined until the end of the construction of one section, when the continuous ground improvement body is constructed by moving the digging device several times with respect to the construction section from the above background. It is what we propose.
[0008]
[Means for Solving the Problems]
In the present invention, the endless chain is circulated in the direction in which the section located on the front side in the traveling direction of the endless chain descends while the digging apparatus moves, and the cutter post of the digging apparatus is moved a plurality of times. lower end below the lower end of the cutter post during movement of the last, with is positioned ground undisturbed by Rukoto is circulated in a direction in which the segment is located an endless chain traveling direction front side descends, second and subsequent cutting stirring nails during movement in a state scratching in the direction opposite to the direction of progression of the ground, and the execution of one section is completed, the cutter post lower end to avoid the inclination of the cutter post due to retraction of.
[0009]
By circulating the endless chain in such a direction that the section located on the front side in the traveling direction of the endless chain goes down with the cutter post in between, the ground is dug when the cutting stirring claw passes the lower end of the cutter post as described above. If the endless chain is circulated, the lower end of the cutter post moves in the direction of travel as the upper end moves.
[0010]
Also, by placing the lower end of the cutter post below the lower end of the cutter post during the previous movement during the multiple movements of the grooving device, the cutting stirring pawl when passing through the lower end of the cutter post is always disturbed There is no reaction force shortage caused by scratching the ground that is disturbed, and it is possible to reliably remove the reaction force from the ground.
[0011]
The cutting stir claw reliably removes the reaction force from the ground at the bottom of the hole, and if the endless chain circulates, the lower end of the cutter post will change according to the speed of the cutting stir claw as it passes through the lower end of the cutter post. In order to move forward, the cutter post can be moved at a constant speed over the entire length just by moving the upper end of the cutter post in the direction of travel, and the upper end of the cutter post leads forward in the direction of travel. The situation in which the lower end is retracted is avoided. As a result, a situation where construction is impossible is prevented and construction efficiency is improved.
[0012]
The reaction force from the ground by the cutting agitating claw when passing through the lower end of the cutter post is substantially ensured by at least one cutting agitating plate on which the cutting agitating claw protrudes as described in claim 2. It is ensured by having a cutting stirring claw over the entire width of the groove. Further, the cutting stirring pawl is formed in a symmetric shape with respect to the center line of the cutting stirring plate, thereby corresponding to a change in the direction of movement of the digging apparatus .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The invention of claim 1 shows a digging apparatus 1 comprising a cutter post 2 and an endless chain 3 stretched around the outer periphery of the cutter post 2 and provided with a cutting stirring claw 4 for one construction section, as shown in FIGS. In this way, the continuous soil improvement body 12 is constructed by agitating and mixing the cutting soil and the solidified material 11 by moving the material multiple times.
[0014]
1 to 3 show a case where the digging apparatus 1 is moved three times in one reciprocal half, but the construction may be completed by two reciprocations of one reciprocation or may be moved more than three degrees. .
[0015]
1 to 3, the ground is excavated while supplying only the drilling fluid 10 that does not consolidate during the first round trip, that is, during the first and second movements, and solidifies during the third movement. Although the drilling is performed again while discharging or supplying the material 11, stirring and mixing are shown, the drilling may be performed while supplying the solidified material 11 from the first movement, and stirring and mixing may be performed. 1-3, the excavation part by the 1st movement and the 2nd movement is each shown by the 1-pass part, the 2nd pass part, and the stirring part by the 3rd movement is shown by the 3rd pass part.
[0016]
In the grooving device 1, a cutter post 2 is moved along a frame 6 by a hydraulic cylinder mounted on a base machine 5 and moved in a horizontal direction using the base machine 5 as a reaction force, and the cutting stirring claw 4 of the circulating endless chain 3 is grounded. The ground improvement body 12 is constructed by mixing the solidified material 11 discharged from the cutter post 2 or supplied from the ground and the cutting soil.
[0017]
The grooving device 1 is supported so as to be movable up and down along the leader 7 with respect to the base machine 5, and is shown by a wire cylinder 8 and a hydraulic cylinder or other lifting means installed separately from the horizontal movement hydraulic cylinder as shown. It moves up and down along the reader 7. When constructing the ground improvement body 12 in which the digging apparatus 1 forms a vertical surface, the ground improvement body 12 held by the reader 7 with the axis of the cutter post 2 facing the vertical direction and inclined with respect to the vertical surface In the case of construction, the reader 7 is held in an inclined state with respect to the vertical direction.
[0018]
When the digging apparatus 1 moves, the endless chain 3 is circulated in a direction in which the section located on the front side in the advancing direction indicated by an arrow is lowered (scraping direction) with the cutter post 2 interposed therebetween, as shown in FIG. As shown in FIG. 5, the direction of the grooving device 1 and the direction of the reaction force received from the ground when the cutting stirring claw 4 passes through the idler 9 at the lower end of the cutter post 2 coincide with each other. As a result, the lower end of the cutter post 2 tends to move in the direction of advancement of the grooving device 1 by the circulating cutting stirring claw 4, so that the movement of the grooving device 1 by the hydraulic cylinder of the base machine 5 passes through the idler 9. It will be supplemented by the cutting stirring claw 4.
[0019]
6 to 8, the cutting stirring claw 4 is formed so as to be easily subjected to a reaction force from the ground by scratching the ground when the cutting stirring claw 4 passes through the idler 9, and the cutting stirring claw 4 is deformed from the ground. The case where the force is ensured is shown.
[0020]
The cutting stirring claw 4 is fixed to the endless chain 3 and protrudes from a cutting stirring plate 4 ′ having a length larger than the width of the cutter post 2. A cutting stirring claw 4 protrudes from the stirring plate 4 'over substantially the entire width of the digging groove (ground improvement body 12). In any case of FIGS. 6 to 8, since the digging apparatus 1 changes the direction of movement between the first time and the second time, the cutting stirring claw 4 is formed symmetrically with respect to the center line of the cutting stirring plate 4 ′.
[0021]
As shown in FIG. 2 showing the state of the second movement of the digging apparatus 1, the cutting stirring claw 4 passing through the idler 9 does not move in the ground disturbed by the first movement. When the digging apparatus 1 is moved for the second time, the digging apparatus 1 is lowered with respect to the leader 7 by adjusting the wire rope 8 or the like, and the lower end of the cutter post 2 is moved to the lower end of the cutter post 2 during the first movement. Is located below.
[0022]
Similarly, the lower end of the cutter post 2 during the third movement is positioned below the lower end of the cutter post 2 during the second movement, as shown in FIG. It is done. FIG. 4 shows the level of the lower end of the cutter post 2 from the first time to the third time.
[0023]
【The invention's effect】
In the case of constructing a continuous ground improvement body by moving the grooving device a plurality of times with respect to one construction section, when the grooving device is moved, the endless chain is positioned on the front side in the traveling direction across the cutter post. with circulating endless chain in the direction section is lowered to, below the lower end of the plurality th cutter post at the time of movement of the last of the lower end of the cutter post when moving the Homizo device, with is positioned ground undisturbed , because is circulated in a direction in which the segment is located an endless chain traveling direction front side descends, scratching the ground in a direction opposite to the direction of progression of cutting agitation pawls passing the lower end of the cutter post reliably Homizo device Can do.
[0024]
As a result, since the lower end of the cutter post tends to move forward according to the speed of the cutting stirring claw, the cutter post is moved at a constant speed over the entire length simply by moving the upper end of the cutter post in the direction of travel. It is possible to avoid the situation where the cutter post is inclined from the state at the start of construction, and the construction efficiency is improved.
[0025]
According to the second aspect of the present invention, the cutting agitating claw is formed over substantially the entire width of the digging groove on at least one cutting agitating plate on which the cutting agitating claw is projected, so that the reaction force by the cutting agitating claw is ensured. . Further, since the cutting stirring claw is formed in a symmetrical shape with respect to the center line of the cutting stirring plate, it can cope even if the grooving device changes the direction of movement .
[Brief description of the drawings]
FIG. 1 is an elevational view showing a state of a first movement of a digging apparatus.
FIG. 2 is an elevation view showing a state when the digging apparatus is moved for the second time.
FIG. 3 is an elevational view showing a state when the digging apparatus is moved for the third time.
FIG. 4 is an elevational view showing the relationship between the level of the lower end of the cutter post during the first movement and the level of the lower end of the cutter post during the second and third movements.
FIG. 5 is an enlarged view of FIG. 1 or FIG. 3 showing the relationship between the direction of movement of the digging apparatus and the reaction force from the ground acting on the cutting stirring claw.
FIG. 6 is a perspective view showing an example of forming a cutting stirring claw.
FIG. 7 is a perspective view showing an example of forming a cutting stirring claw.
FIG. 8 is a perspective view showing an example of forming a cutting stirring claw.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Groove device, 2 ... Cutter post, 3 ... Endless chain, 4 ... Cutting stirring claw, 4 '... Cutting stirring plate, 5 ... Base machine, 6 ... Frame, 7 ... Leader, 8 ... wire rope, 9 ... idler, 10 ... drilling fluid, 11 ... solidified material, 12 ... ground improvement body.

Claims (2)

The digging groove device consisting of an endless chain with a cutting stirring claw protruding from the cutter post and its outer periphery is moved to at least one reciprocation multiple times for one construction section to stir the cutting soil and solidified material. In the method of mixing and constructing the continuous ground improvement body, the endless chain is circulated in the direction in which the section located on the front side in the advancing direction across the cutter post descends during the movement of the digging apparatus, and the digging apparatus multiple times The lower end of the cutter post is positioned on the undisturbed ground below the lower end of the cutter post at the previous movement , and the endless chain is circulated in a direction in which the section located on the front side in the traveling direction descends. always method of constructing a continuous soil improvement material you ready to cut stirring nail scratching in the direction opposite to the direction of progression of the ground when the cutting stirring pawl passes the lower end of the cutter post. At least one cutting stirrer plate on which the cutting stirrer claw protrudes has a cutting stirrer claw substantially over the entire width of the digging groove, and the cutting stirrer claw is formed symmetrically with respect to the center line of the cutting stirrer plate. The construction method of the continuous ground improvement body of Claim 1 .

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