JPH06220838A - Forming method for undergound continuous wall - Google Patents

Abstract

PURPOSE:To prevent the occurrence of an overturning accident of a device, unify in thickness various sections of an underground wall formed via the stirring and mixing of the sediment of the original ground and a consolidating liquid, improve the linearity of the underground wall, and unify the mixing state in the lateral direction of the underground continuous wall formed by the mixture of the sediment of the original ground and the consolidating liquid. CONSTITUTION:A consolidating liquid is erupted from a stirring device 1 inserted into the ground, and the sediment of the original ground and the consolidating liquid are stirred and mixed by the stirring device 1. The stirring device 1 is moved in the lateral direction to form an underground continuous wall 3 in the ground while it is kept inserted into the ground for stirring and mixing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a continuous wall in the ground by stirring and mixing the earth and sand of the original ground and a congealing liquid.

[0002]

2. Description of the Related Art Conventionally, it has been possible to form a continuous underground wall by stirring and mixing the earth and sand of the original ground and a congealing liquid in the ground to improve the ground such as a retaining wall, an underground dam, and a soft ground. Are known. For example, in the past, a crawler crane was equipped with a plurality of vertically long stirring shafts so that the stirring shafts could be moved vertically, and the stirring shafts were sprayed while consolidating liquid such as cement milk from the bit at the tip of the stirring shaft. By inserting the stirring means provided in the stirring shaft together with the stirring means to form a pillar body such as soil cement by stirring and mixing the earth and sand of the original ground and the consolidation liquid, then, pulling up the stirring shaft and moving the crawler crane, Next, the stirring shaft is moved down next to the column body, and while stirring liquid such as cement milk is jetted from the bit at the tip of the stirring shaft, the sediment of the original ground and the consolidation liquid are stirred and mixed to form the column body. The underground wall was formed by repeating the work of forming.

[0003]

In the conventional example as described above, since a plurality of heavy and long vertically long stirring shafts are mounted on the crawler crane and the stirring shafts are moved up and down, the stirring is carried out. The height when the shaft is pulled up to the ground becomes higher. For this reason, there is a risk that the entire device will tip over if it is not stable, or if strong winds or unexpected external forces are applied.To prevent the tipping over, the entire device will become large, which causes a cost increase. There's a problem. Further, the cross-sectional shape of the columnar body, which is a unit of the mixture of earth and sand formed by rotating the stirring shaft, and the consolidation liquid, is circular,
Therefore, a columnar body formed continuously in the lateral direction has a problem that the cross-sectional shape is skewered dumpling-shaped and the thickness is different, and that the strength and water stoppage cannot be constant in each lateral portion. is there. Further, in the past, it was necessary to raise the stirring shaft to the ground, move the crawler crane laterally, and then lower the stirring shaft to form a pillar body in the ground, so long vertical stirring During the step of pulling up the shaft and the step of moving the crawler crane laterally after pulling up the shaft, there is a problem that the sand and sand and the congealing liquid are not stirred and mixed, and the construction takes time. Further, in the conventional method, the stirring shaft is pulled up to the ground, the crawler crane is moved laterally, and then the stirring shaft is lowered to form the pillar body in the ground, which is repeated. There is a problem that the straightness of the underground wall is poor. Also,
According to the conventional method, since the next pillar is continuously formed next to the pillar formed in the ground, the underground continuous wall formed has a mixed state of the sediment and the congealing liquid in the lateral direction. It may not be said to be uniform, and the strength of the mixture of earth and sand and the consolidation liquid in the lateral direction of the underground continuous wall to be formed may not be uniform.

The present invention has been made in view of the above-mentioned problems of the conventional example, and its purpose is to prevent the occurrence of a fall accident of the device and to consolidate it with the earth and sand of the original ground. The thickness of each part of the underground wall formed by stirring and mixing the working liquid can be made uniform, and the linearity of the underground wall is improved, and it is formed by the mixture of the earth and sand of the original ground and the hardening liquid. It is an object of the present invention to provide a method for forming a continuous underground wall in which the mixed state in the horizontal direction of the continuous underground wall is made uniform and the construction time can be shortened.

[0005]

According to the method for forming a continuous underground wall of the present invention, a stirrer 1 inserted into the ground is used to inject a congealing liquid, and the stirrer 1 is used to consolidate the soil and sand of the original ground. The method is characterized in that the stirring device 1 is laterally moved while being stirred and mixed with the liquid to form a continuous underground wall 3 in the ground. The object of the present invention is achieved by solving the above-mentioned conventional problems by adopting.

[0006]

According to the present invention having the above structure,
The stirring liquid is injected from the stirring device 1 inserted in the ground, and the stirring device 1 moves the stirring device 1 laterally in the ground while stirring and mixing the soil and sand of the original ground and the hardening liquid. By forming the underground continuous wall 3 therein, even if the stirring device 1 inserted in the ground is long in the up-down direction, the protruding length to the ground is short, and the device does not fall over. . Further, while the stirrer 1 is still inserted in the ground, the stirrer is moved laterally to stir and mix the soil and sand of the original ground and the consolidation liquid, whereby the underground continuous wall 3 having the same thickness in each part in the lateral direction. Can be formed in the ground and the linearity of the ground continuous wall 3 can be improved. Then, while moving in the lateral direction, the earth and sand of the original ground and the congealing liquid are agitated and mixed to form the underground continuous wall 3, whereby the agitating device 1 is used for mixing the earth and sand of the original ground and the congealing liquid. With the movement of the stirring device 1 in the lateral direction, the mixture of the mixture is mixed with new lateral sediment and a congealing liquid, and a part of the mixture is moved rearward in the moving direction of the stirring device 1. And the mixture in the rear part of the stirring device 1 in the moving direction is mixed, and the underground wall 3 thus formed has a substantially uniform mixture of the earth and sand of the original ground and the consolidation liquid in the lateral direction. Mixing will be done. In addition, the stirrer 1 is sprayed from the stirrer 1 and the stirrer 1 is used to move the stirrer 1 laterally in the ground while stirring and mixing the soil and sand of the original ground with the stirrer. Since the intermediate continuous wall 3 is formed, the underground continuous wall 3 can be continuously formed in the ground without loss time, and in this case, after forming a hole like a concrete burying hole, Since two steps such as burying concrete are not required, the construction time can be significantly shortened.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. In the embodiment shown in FIGS. 1 to 4, the stirring device 1
Is constructed by connecting a plurality of rotating vertical axes 4 with a connecting member 5 in the vertical direction at a constant pitch, and providing agitating means 6 on the connecting member 5. Here, each vertical axis 4 with respect to the connecting member 5
The connecting member 5 is attached to each vertical axis 4 via a bearing 7 so as to be rotatable. The connecting member 5 has a vertical axis 4
The main body 8 is attached to the main body 8 via the bearing 7, and the pair of protrusions 9 projecting in the front-rear direction from both sides of the main body 8 and the central connecting portion 18 that form a pair. The horizontal axis of rotation 1 is provided between the left and right ends of the protruding portion 9 and the central portion.
No. 0 is rotatably installed and attached, and blades 11 are fixed to the three rotating horizontal shafts 10, respectively. The power transmission mechanism 1 is provided in the main body portion 8, the protruding portion 9, and the central connecting portion 18.
2 is internally provided, and the rotation of the vertical axis 4 is converted into the rotation of the blade 11 via the power transmission mechanism 12. As the power transmission mechanism 12, for example, a bevel gear 13 is fixed to the vertical axis 4, a bevel gear 14 is rotatably attached to the main body 8 in the main body 8, both bevel gears 13 and 14 are engaged, and fixed to the bevel gear 14. The transmission of power from the gears 15 to the gear 16 fixed to the rotating horizontal shaft 10 by the gear group, the transmission of power by the chain 17,
Power is transmitted by the transmission of power by a shaft drive. Here, the connecting member 5 also serves as a spacing member for keeping the spacing between the plurality of vertical axes 4 constant. Further, since the plurality of vertical axes 4 are connected by the connecting member 5, the vertical axis 4 rotates and the rotation of the vertical axis 4 is rotated by the blade portion 11.
When rotating, the connecting member 5 can be prevented from rotating with the rotation of the vertical axis 4.

As shown in FIG. 2 and FIG. 4, a blade portion 11 provided on a rotating horizontal shaft 10 erected on a protruding portion 9 has a blade portion 11 adjacent in the vertical direction in which a part of the rotation locus is in the vertical direction when viewed from the front. Are designed to wrap each other. Also,
In the embodiment shown in the accompanying drawings, the blade portion 11 is constructed by cantilevering a plurality of blade element bodies 11a from the rotating horizontal shaft 10. Here, in order to project a plurality of blade element bodies 11a on one rotation horizontal axis 10, the blade element bodies 11a adjacent to each other are projected so that the projecting directions form an angle α, as shown in FIG. In the embodiment, α is 180 ° between the adjacent blade element bodies 1a.
Further, in the blade portion 11 provided on the rotating horizontal shaft 10 provided on the protruding portion 9, the protruding directions of the blade element bodies 11a that are vertically adjacent to each other are protruded by an angle β, and the embodiment shown in the accompanying drawings. Then β is 90 °. Of course, the above α and β are not limited to the above embodiments. In short, the horizontal axis 1 located at least on both sides by the above-mentioned configuration
The total axial length (indicated by L in FIG. 2) of 0 in the axial direction is a stirring area by the plurality of blade element bodies 11a, and the rotation trajectories of the blade element bodies 11a that are vertically adjacent to each other partially overlap. Therefore, with such a configuration, the arrow A in FIG.
Even if the stirring device 1 is moved in either the B direction or the B direction, the stirring blades 11 on both sides stir the entire length in the axial direction and the entire length in the vertical direction of the rotating horizontal shaft 10.

The upper ends of the plurality of vertical axes 4 are supported by the multi-axis device 19, and the rotation of a driving device 20 such as a motor is rotated through the multi-axis device 19 along each vertical axis 4. ing. The vertical axis 4 is provided with injection holes 21 for injecting a plurality of cementing liquids such as cement milk at an arbitrary pitch in the vertical direction, which is piped from the outside into the multi-axis device 19 and further the vertical axis 4 It is connected to the inner pipe, and the congealing liquid is injected from the injection hole 21 that communicates with the pipe.
The base 34 to which the multi-axis device 19, the drive device 20 and the like are attached is movably attached along the rail 23 of the crawler crane 22 and is suspended by the wire 24.

Therefore, the agitating device 1 as described above is used to agitate and mix the earth and sand of the original ground with the congealing liquid to form the underground wall 3, but the following method is used. By. That is, first, the vertical axis 4 constituting the stirring device 1 is inserted into the ground. Here, in inserting the stirring device 1 into the ground, a starting end hole may be formed in the ground 26 in advance, and the stirring device 1 may be inserted into this starting end hole.
Alternatively, as shown in the attached figure, a bit 25 is provided at the lower end of the vertical axis 4.
Alternatively, the stirring device 1 may be inserted to a target depth while excavating the ground 26 with the bit 25 while rotating the vertical axis 4. In this case, the stirring device 1 may be inserted to a desired depth while spraying the consolidation liquid from the spray holes 21. When the stirrer 1 is inserted from the desired depth in the ground to the ground, the crawler crane 22 is moved laterally and the cement milk is injected from the injection hole 21.
An agitation blade is passed through the power transmission mechanism 12 by jetting a setting liquid mainly composed of cement milk or another type of setting liquid such as another setting liquid and rotating the vertical axis 4. 11 is rotated in a vertical plane, whereby the earth and sand of the original ground and the consolidating liquid are stirred and mixed continuously in the moving direction of the stirrer 1 over the entire length in the vertical direction to form the underground continuous wall 3 in the ground. To form.

Here, when the ground 26 is a soft ground, the soft ground located in front of the traveling direction is destroyed by rotating the stirring blade 11, and the collapsed soil of the ground is stirred. The blade 11 stirs and mixes with the consolidation liquid, and at the same time, a part of the mixture moves so as to be scraped backward in the traveling direction. Further, the central stirring blade 11 stirs and mixes and a part of the mixture advances. It moves so as to be scraped backward in the direction, and is further stirred and mixed by the stirring blade 11 at the rear. Moreover, since the above-mentioned action is performed during the lateral movement of the stirring device 1, the stirring device 1
In the lateral movement direction, the front and rear agitated mixtures are mixed with each other, so that the soil continuous wall 3 of soil cement in which the earth and sand of the original ground and the solidifying liquid are substantially uniform in the front and rear direction is formed. Here, when the ground 1 is hard, the original ground is previously excavated by using another excavation shaft to loosen the ground, and then the stirring device 1 is inserted into the loosened ground to move laterally. However, the loosened earth and sand and the congealing liquid may be mixed by stirring to form the continuous underground wall 3. Here, when excavating the raw ground by using another drilling shaft to loosen the ground, a drilling hole having a diameter smaller than the wall thickness of the continuous underground wall 3 to be formed is formed, or the drilling hole is formed. By forming them at arbitrary intervals, the device can be downsized or the cost can be reduced. As another method when the ground 26 is hard, the stirring blades 11 are rotated by providing excavating blades 27 such as cemented carbide blades at the tips of the stirring blades 11 on both sides as shown in FIG. While moving the stirring device 1 in the horizontal direction, the excavating blade 27 of the stirring blade 11 causes the ground 2 on the front surface in the traveling direction to move.
It is possible to proceed while excavating No. 6.

FIG. 8 shows another embodiment of the stirrer 1 used in the present invention. In this embodiment, the stirring device 1 connects a plurality of rotating vertical shafts 4 with a connecting member 5 in the vertical direction at a constant pitch, and a stirring means 6 is provided on the connecting member 5 and the vertical shaft 4 is moved in the vertical direction. A plurality of wing portions 28, a stirring portion 30 such as a screw portion 29 are provided and configured. Then, the agitating section 30 also agitates and mixes the earth and sand of the original ground and the congealing liquid. Here, the one provided with the screw part 29 as the stirring part 30 can stir and mix while moving the mixture of the earth and sand of the original ground and the consolidation liquid in the up and down direction, and also in the moving direction and the up and down direction of the stirring device 1. Uniform stirring and mixing is possible.

FIG. 9 shows still another embodiment of the stirrer 1 used in the present invention. In this embodiment, three ordinates 4 are provided, and the ordinates 4 on both sides and the ordinate 4 in the middle are rotatably connected by a connecting member 5, and at the ordinate 4 portions on both sides of the connecting member 5. Stirring means 6 with stirring blade 11
Is provided. The central vertical axis 4 is provided with a stirring section 30 such as a blade section 28 and a screw section 29. Further, if necessary, the wing portion 28 and the screw portion 2 may be attached to the vertical axis 4 on both sides.
A stirring unit 30 such as 9 may be provided. In this case, the sand in front of the advancing direction is destroyed by the stirring blade 11 located in the front part of the advancing direction and is agitated and mixed with the consolidation liquid by the stirring blade 11, and a part of the mixture is rearward in the advancing direction. It is moved so as to be scraped out to the inside and further stirred by the stirring means 6 in the center. In this case, if the screw part 29 is provided, stirring and mixing is performed while moving in the vertical direction, and a part of the mixture is further moved in the traveling direction. To the rear, and is further stirred and mixed by the rear stirring blade 11. Moreover, since the above action is performed during the lateral movement of the stirrer 1, the agitated mixtures before and after in the lateral movement direction of the stirrer 1 are mixed with each other, so that the earth and sand of the original ground and the consolidation liquid are mixed. The underground continuous wall 3 of soil cement that is substantially uniform in the front-rear direction and the up-down direction is formed.

FIG. 10 shows still another embodiment of the stirrer 1 used in the present invention. In this embodiment, the vertical axis 4 is biaxial and both vertical axes 4 are connected by a connecting member 5. The vertical axis 4 on one side is provided with a stirring means 6 provided with a stirring blade 11, and the vertical axis 4 on the other side is provided with a stirring section 30. Further, FIGS. 11 to 14 show other examples of the stirring device 1 used in the present invention, and in these examples, one vertical axis 4 is used. In this case, the main body 8 may rotate in plan view when the vertical axis 4 rotates, but the main body 8 and the protrusions 9 contact the ground walls on both sides of the stirring device 1 in the traveling direction, and thus the main body 8 is rotated. Is prevented from rotating in a plan view. Here, in order to more reliably prevent the main body portion 8 from rotating in plan view, the upper and lower main body portions 8 and the protruding portions 9 are connected to each other by the vertical connecting plate 3 as shown in FIG. 12, for example.
It is better to connect at 5.

In the above embodiment, the stirring device 1 is attached to the crawler crane 22 provided with a caterpillar, and the crawler crane 22 is moved to move the stirring device 1 laterally in the ground. Although the embodiment has been described, a rail is laid on the ground, a traveling carriage is movably mounted on the rail, the agitator 1 is attached to the traveling carriage, and the traveling carriage travels along the rail so that The stirring device 1 may be made to run.

[0016]

As described above, according to the present invention, the congealing liquid is jetted from the stirring device inserted in the ground, and at the same time, the soil of the original ground and the congealing liquid are mixed by stirring. While moving the agitator laterally with the agitator still inserted into the ground to form a continuous underground wall in the ground, the agitation shaft is inserted into the earth to agitate and mix, and then Compared to the conventional example in which the crawler crane is moved with the stirring shaft fully pulled up and then the stirring shaft is inserted into the ground at the moving position to stir and mix, the vertical axis is inserted into the ground without being pulled up to the ground. It is possible to move continuously and form a continuous underground wall in the ground, there is no fear of falling due to the high lifting height to the ground as in the past, and moreover, it will be grounded during the construction. There is no need to pull up, so when pulling up There is no danger that the compound will be pulled up to the ground, and since it is not necessary to pull it up to the ground during the construction, the construction time will be shortened. Also, it will be solidified with the soil of the original ground while moving laterally. Since the continuous underground wall is formed while stirring and mixing the liquid, the thickness of each part of the continuous underground wall can be made uniform and the linearity of the underground wall can be improved. The mixed state in the lateral direction of the continuous underground wall formed by the mixture of No. 1 is uniformed.

[Brief description of drawings]

FIG. 1 is an overall front view showing an example of an apparatus used in the present invention.

FIG. 2 is an overall side view of the above.

FIG. 3 is an enlarged front view of the above, with a part thereof broken away.

FIG. 4 is a partially omitted enlarged perspective view of the above.

FIG. 5 is an explanatory view showing a state in which the above stirring device is inserted into the ground.

FIG. 6 is an explanatory view showing a state in which the agitating device of the above is moving laterally.

FIG. 7 is a partially cutaway enlarged front view showing another embodiment of the apparatus used in the present invention.

FIG. 8 is a partially cutaway enlarged front view showing still another embodiment of the same device.

FIG. 9 is a partially cutaway enlarged front view showing still another embodiment of the same device.

FIG. 10 is a partially cutaway enlarged front view showing still another embodiment of the same device.

FIG. 11 is a partially cutaway enlarged front view showing still another embodiment of the same device.

FIG. 12 is a partially cutaway enlarged front view showing still another embodiment of the same device.

FIG. 13 is a partially cutaway enlarged front view showing still another embodiment of the same device.

FIG. 14 is an enlarged front view with a part broken away, showing still another embodiment of the same device.

[Explanation of symbols]

 1 Stirrer 2 Liquid for consolidation 3 Continuous underground wall

Claims (1)

[Claims] 1. A state in which the stirrer is inserted into the ground while the stirrer inserted into the ground injects the congealing liquid and the stirrer stirs and mixes the soil and sand of the original ground with the congealing liquid. A method for forming an underground continuous wall, which comprises laterally moving to form an underground continuous wall.