JPH09125372A - Multishaft cast in situ diaphragm wall construction method and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate any large pressure in backfilling a mixture mixed on the ground in a groove. SOLUTION: A horizontal force is laterally applied on a multishaft excavating soil lifting device 3, which is formed by arranging a plurality of rotary vertical shafts 2 having screw parts 1 in a lateral row, so as to laterally move the multishaft excavating soil lifting device 3 and form a groove 4 in the ground and at the same time the excavation soil 5 is discharged to the ground by the screw part 1. The movement reaction of the multishaft excavation soil lifting device 3 is supported by a pressure proof device 6 inserted in the ground. After a fixed length of the multishaft excavation soil lifting device 3 is laterally moved, the pressure resistant device 6 is made to move to the side of the multishaft excavation soil lifting device 3. Secondarily, after the multishaft excavation soil lifting device 3 is laterally moved in the same way so as to form the groove 4 and at the same time the excavation soil 5 is discharged on the ground by the screw part 1. A mixture 7 obtained by mixing ground improvement materials to the excavation soil 5 discharged on the ground in a series of processes is backfilled in the groove in the rear part of the pressure resistant device 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiaxial underground wall continuous construction method and its apparatus.

[0002]

2. Description of the Related Art Conventionally, one rotary vertical axis having a spiral portion is inserted into the ground, and the rotary vertical axis excavates the ground in a lateral direction to form a groove and discharge the excavated soil to the ground. Cement on the ground to excavated earth and sand discharged to the ground, to produce a self-hardening slurry mixture by mixing water, and pouring this mixture into the groove behind the sealing member connected to the rear side of the rotating vertical axis, Japanese Patent Application Laid-Open No. HEI 7-70104 discloses a method in which the pressure generated by the pouring of this slurry-like mixture is applied to the seal member to propel the rotating vertical axis connected to the seal member forward so that horizontal excavation proceeds. 189255
Has been proposed.

In this conventional example, the construction period can be shortened by continuously forming the underground wall without raising the device.
Also, by discharging the excavated soil to the ground, mixing it with cement and water on the ground, and returning it to the groove again, the mixture of the mixture can be managed on the ground, and more uniform ground improvement can be performed. However, there are problems as described below.

[0004]

That is, in the above-mentioned conventional example, the mixture is poured into the groove rearward of the seal member connected to the rear side of the rotary longitudinal axis, and the pressure due to the pouring of the slurry-like mixture. Is applied to the seal member to propel the rotary ordinate connected to the seal member forward, so that when the pressure for pouring the mixture into the groove is weak, the rotary ordinate is caused to act on the seal member. There is the problem that it cannot be propelled forward and as a result it requires high pressure to pour the mixture. Further, in this way, when the mixture is returned to the groove with a high pressure to flow the mixture and the high pressure is applied to the seal member, the mixture is discharged from the upper opening of the groove rather than advancing the seal member. Although it is not described in the above-mentioned conventional example, it is necessary to cover the upper opening of the groove to prevent the mixture from being blown upward due to high pressure. is there. Further, in the prior art, without separately providing a mechanical propulsion device, the pressure due to the pouring of the mixture acts on the seal member to propel the rotating vertical axis connected to the seal member forward, It is necessary to improve the excavation of the ground by the spiral portion to promote forward propulsion. Therefore, in the conventional example, it is necessary to specially provide an excavation claw on the outer periphery of the spiral portion provided on the rotating vertical axis. Therefore, there is a problem that it is not possible to use a screw auger that is generally used and that does not have an excavating claw on the outer periphery of the spiral portion as the rotating vertical axis having the spiral portion.

Further, in the prior art, only one rotating vertical axis is used, and with the single rotating vertical axis inserted into the ground, the rotating vertical axis having the spiral portion is rotated. Since the ground is excavated in the lateral direction to form a groove and the excavated earth and sand are discharged to the ground, the directional relationship of the force acting in the lateral traveling state is as shown in the horizontal sectional view of FIG. That is, a in FIG. 5 indicates the direction of the force that pushes the rotation vertical axis 2 in the horizontal direction, and b indicates the rotation direction of the rotation vertical axis 2. In other words, the force that pushes forward in the direction a acts on the vertical axis of rotation 2,
Since one rotation vertical axis 2 is rotating in the direction of B, the entire device tends to move as shown by the arrow C. Moreover, since the rotation vertical axis 2 is one, the horizontal length of the entire apparatus is also short, and as a result, the rotation vertical axis 2 in the ground 35.
The rotating force of the device makes it easier for the entire device to rotate. As a result, it has been difficult in the past to laterally excavate a groove in a straight line.

Further, in the prior art, since the excavation in the lateral traveling direction is performed over the entire length in the vertical direction by using one rotating vertical axis, and the ground is excavated on the ground by the one rotating vertical axis.
If soil is clogged in some part of the vertical direction during unloading, smooth unloading may not be possible. By the way, in recent years, a situation has arisen in which harmful substances flowing out from a disposal site of industrial waste, a place where harmful substances are generated, or the like flow out together with groundwater and destroy the environment. On the other hand, it is conceivable to form a concrete underground wall to block the groundwater mixed with harmful substances, but this has a problem that the construction becomes large-scale and the cost becomes high. Therefore, it is possible to form a soil cement underground wall by agitating and mixing so-called excavated soil and cement milk of the so-called local plate that can be constructed at a short construction period and at low cost, or
It is possible to discharge the excavated soil to the ground, mix it with cement and water on the ground and return it to the trench again to form a soil cement underground wall, thereby blocking the groundwater mixed with harmful substances. Although it is conceivable, in the former case, in addition to the latter problem to be described later, since the excavated soil and cement milk are mixed by stirring in the ground, a non-uniform portion is generated,
Groundwater containing toxic substances may leak and is not suitable as an underground wall for shielding toxic substances. In the latter case, control the mixing of excavated earth and sand discharged above ground with cement and water. However, since soil cement has a higher water permeability than concrete, groundwater containing harmful substances will seep into the soil cement underground wall for a long period of time, and soil cement ground walls The inside of the inner wall is deteriorated by harmful substances, and cracks and holes penetrating inside and outside the soil cement underground wall are created, and finally groundwater containing harmful substances flows out from this part through the underground wall of soil cement. There is a fear. In addition, this toxic substance not only flows out from the disposal site of industrial waste or the place where toxic substance is generated, but it also forms an underground dam near the coast to form groundwater such as drinking water, industrial water, and water for agriculture. When water is taken, the salt content in seawater is the same as a kind of harmful substance, and in this case as well, the same problem as described above may occur.

Further, when the ground improvement or the underground structure such as the underground wall is a hardened concrete or soil cement,
When an earthquake occurs, the underground structure itself cannot absorb the external force of the earthquake, and there is a possibility that the underground structure and the ground structure formed on it may be damaged. Means for Solving the Problems The present invention solves the above-mentioned problems, and in returning the mixture mixed on the ground into the groove, it does not require a large pressure for advancing the device, and the device can be easily laterally propelled. It is also possible to use the multi-axis excavating and hoisting device that is generally used for vertical excavation as it is, and to use it as a device for lateral excavation and hoisting,
In addition, excavation and land excavation can be performed smoothly, horizontal excavation can be performed accurately in a straight line, and a ground wall that can reliably block groundwater containing harmful substances is formed. Another object of the present invention is to provide a multi-axis underground wall continuous construction method and apparatus capable of forming an underground wall capable of absorbing the external force of an earthquake.

[0008]

In order to solve the above-mentioned problems, the multiaxial underground wall continuous construction method of the present invention is used to construct a vertical underground continuous wall having a constant width in the ground. A horizontal force is applied in the lateral direction to the multi-axis excavation and hoisting device 3 in which a plurality of rotating vertical axes 2 provided with the spiral portion 1 are arranged side by side in the horizontal direction to move the multi-axis excavating and hoisting device 3 in the lateral direction. To form the groove 4 and discharge the excavated sand 5 to the ground by the spiral portion 1, and the pressure device 6 which inserts the reaction force of the horizontal force laterally applied to the multi-axis excavation excavator 3 into the ground. After supporting and pushing the fixed-length multi-axis excavation hoisting device 3 in the lateral direction, the pressure device 6 is moved to the multi-axis excavating hoisting device 3 side, and then again to the multi-axis excavating hoisting device 3. The horizontal force is applied in the direction to move the multi-axis excavation and hoisting device 3 in the lateral direction to form the groove 4 and the spiral portion 1
To discharge the excavated sand 5 to the ground, and to support the reaction force of the horizontal force laterally applied to the multi-axis excavated hoisting device 3 by the pressure device 6 inserted in the ground, and during the above series of steps, It is characterized in that the mixture 7 obtained by mixing the ground improvement material with the excavated earth and sand 5 discharged on the above is returned into the groove 4 behind the pressure resistant device 6.

Further, a horizontal force is applied in the lateral direction to the multi-axis excavation hoisting device 3 in which a plurality of rotating vertical axes 2 provided with the spiral portion 1 are arranged side by side in a row, so that the multi-axis excavating hoisting device 3 is laterally moved. It is also preferable that the rotational directions of the plurality of rotary ordinates 2 are different when the groove 4 is formed by moving in the direction. In addition, a horizontal force is applied in the lateral direction to the multi-axis excavating and hoisting device 3 in which a plurality of rotating vertical axes 2 provided with the spiral portion 1 are arranged side by side, and the multi-axis excavating and hoisting device 3 is moved laterally. In forming the groove 4, a traveling direction adjusting device 8 for adjusting the traveling direction in the lateral direction of the plurality of rotation vertical axes 2 arranged side by side is provided, and the traveling direction adjusting device 8 adjusts the traveling direction. However, it is also preferable to move the multi-axis excavation and hoisting device 3 laterally to form the groove 4.

Further, it is also preferable that the excavated earth and sand 5 by the multi-axis excavation and hoisting device 3 and the returned mixture 7 are partitioned by a partition member 9 so as not to be mixed in the ground. In addition, the partition member 9 is arranged between the multi-axis excavation hoisting device 3 and the pressure resistant device 6, and the partition member 9 and the pressure resistant device 6 are not self-curing such as bentonite or slag grout that does not cure by itself. It is also preferable to add the liquid substance 10.

It is also preferable to eject air or water when excavating and excavating by the multi-axis excavating and excavating device 3. It is also preferable that the plurality of rotary ordinates 2 are rotatably connected by the connecting member 11 and air or water is jetted forward from the tip of the connecting member 11. Further, the pressure-resistant device 6 is provided with a fixing means 12 for fixing the pressure-resistant device 6 to the side wall of the groove 4 or the bottom of the groove 4, and the pressure-resistant device 6 is fixed to the side wall of the groove 4 or the bottom of the groove 4 by the fixing means 12. It is also preferable to support the reaction force of the horizontal force applied in the lateral direction to the multi-axis excavation hoisting device 3 in a fixed state.

It is also preferable that the excavated soil 5 discharged to the ground is sieved by a sieving means 13 to remove large particles in the excavated soil 5 and then the ground improvement material is mixed. In addition, when returning the mixture 7 obtained by mixing the ground improvement material to the excavated earth and sand 5 discharged to the ground into the groove 4 behind the pressure resistant device 6, the mixture 7 is mixed in the groove 4.
It is also preferable to apply vibration so as to stuff it in such a manner that there are no voids.

It is also preferable that the ground improvement material mixed on the ground with the excavated soil discharged on the ground has acid resistance. It is also preferable that the ground improvement material mixed on the ground with the excavated soil discharged on the ground has salt resistance. It is also preferable that the ground improvement material mixed on the ground with the excavated soil discharged on the ground has elasticity like rubber.

The multi-axial underground wall continuous building apparatus of the present invention is an apparatus for building a vertical underground continuous wall having a constant width in the ground, and has a rotating vertical axis 2 having a spiral portion 1. And a multi-axis excavation hoisting device 3 to be inserted into the ground, in which a plurality of rotating vertical axes 2 are made to have different rotational directions.
A horizontal force application device 1 for applying a horizontal force that pushes the multi-axis excavation and hoisting device 3 in the lateral direction in which a plurality of rotating vertical axes 2 are arranged.
4, a pressure-resistant device 6 that serves as a reaction force member for the horizontal force, a mixing device 15 for mixing ground improvement material on the ground and soil that has been unloaded, and a mixture 7 mixed by the mixing device 15. And a return device 16 for returning the above into the groove 4.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. 1 and 2 show an embodiment of an underground continuous wall forming apparatus A used in the present invention, and FIGS. 3 and 4 show another embodiment. The multi-axis excavation and hoisting device 3 includes a plurality of rotary ordinates 2 having a spiral portion 1 (two in FIG. 1 and FIG. 2,
3 and 3 are arranged in a line in the horizontal direction. A plurality of rotating vertical axes 2 are rotatably attached to the connecting member 11, and one end of the connecting member 11 is fixed to the front side of the partition member 9. The spiral portion 1 is provided over substantially the entire length of the rotating vertical axis 2 excluding the portion where it is attached to the connecting member 11. A plurality of rotary ordinates 2 have a multi-axis drive device 4 at the upper end of each of them.
It is connected to 0, and by driving the multi-axis drive device 40, it is possible to rotate a plurality of rotating vertical axes 2. Further, in the above-described embodiment, an example in which the upper end of each of the plurality of rotary ordinates 2 is connected to the multi-axis drive device is shown, but the plurality of rotary ordinates 2 are connected to different drive devices, respectively. The rotating vertical axis 2 may be driven by each driving device. In any of the embodiments, the plurality of rotation vertical axes 2 have different rotation directions so that when any one of the rotation vertical axes 2 rotates in the positive direction, the other rotation vertical axes 2 rotate in the opposite direction. I have it. In the embodiment shown in FIGS. 1 and 2, two rotary ordinates 2 are arranged side by side, and the two rotary ordinates 2 have their rotation directions opposite to each other. Four
In the embodiment described above, the rotation directions of the three rotation vertical axes 2 adjacent to each other are opposite to each other. In addition,
Four or more rotating vertical axes 2 may be arranged in parallel. In the case of four, two are normally rotated and two are reversely rotated.

The connecting member 11 is provided at its front end with a jetting portion 17 for jetting air or water forward, and the jetting portion 17 is provided with air or air along the connecting member 11 and the partition member 9. A pipe (not shown) for supplying water is provided. Here, in the embodiment shown in the drawings, each rotary vertical axis 2 is provided with a drill bit 20 at the lower end. In this way, the drill bit 20 is provided at the lower end of the rotary vertical axis 2 because the rotary vertical axis 2 is the rotary vertical axis 1 with the spiral portion 1 that is generally used for normal vertical drilling. This is because the excavation bit 20 provided at the lower end serves to excavate the ground during the vertical excavation.

Further, in the rotating vertical axis 2 generally used in the vertical excavation, the jetting portion 17 'of the fluid used in the vertical excavation is provided at the lower end portion of the excavating bit 20. Alternatively, air or water may be jetted out by using the jetting portion 17 '. In this case, the connecting member 11
The jet portion 17 may be provided at the front end portion of so that air and water are jetted from the jet portion 17 as well. Of course, air or water may be ejected only from the ejection portion 17 or only from the ejection portion 17 '.

The connecting member 11 is provided with a traveling direction adjusting device 8. Specifically, cylinder devices 21 such as hydraulic cylinders are provided on the front and rear sides of the connecting member 11, and the sled plates 22 are attached to the tips of the two cylinder devices 21 on one side. Another sled plate 22 is attached to the tip of each cylinder device 21 to form the traveling direction adjusting device 8. By driving each cylinder device 21, the sled plate 22 is moved.
The contact state of the grooves 4 formed in the ground at the front part and the rear part with the side wall is adjusted, so that the advancing directions of the plurality of rotating vertical axes 2 arranged side by side in a row can be adjusted.

The partition member 9 is slightly longer in the vertical direction than the groove depth of the groove 6 to be formed, and the lateral width of the partition member 9 is almost the same as the groove width of the groove 6 to be formed. Contact with the inner side wall of the groove 6 for sealing. Therefore, both ends of the partition member 9 are provided with an elastic material such as rubber for elastically contacting the inner side wall of the groove 6 for reliable sealing. It is preferable to do so.

A pressure resistant device 6 is arranged behind the partition member 9, and the partition member 9 and the pressure resistant device 6 are connected by a horizontal force applying device 14. In the illustrated embodiment, the horizontal force imparting device 14 is constituted by a cylinder device 23 such as a hydraulic cylinder. The pressure-resistant device 6 is an elongated box that is long in the vertical direction, and is slightly longer than the groove depth of the groove 6 to be formed in the vertical direction, and its width is slightly smaller than the groove width of the groove 4 to be formed. It's short.

The pressure-resistant device 6 includes an inner wall of the groove 4 to the groove 4.
A fixing means 12 is provided for fixing the pressure-resistant device 6 to the bottom of the device. The fixing means 12 is composed of a lateral projecting member 25 that is moved forward and backward by a cylinder device 24 such as a hydraulic cylinder, and a downward projecting member 27 that is vertically moved by a cylinder device 26. And the lateral protruding member 25
The pressure-resistant device 6 to the inner wall of the groove 4 by pressing or biting the inner wall of the groove 4 or by pressing the lower protruding member 27 to the bottom of the groove 4 or biting it. Alternatively, the pressure-resistant device 6 is fixed to the inner wall of the groove 4. Here, when a plate material is provided at the tip of the side projecting member 25 or the tip of the downward projecting member 27 at a right angle to the projecting direction, the plate material is pressed against the inner wall and the bottom of the groove 4 and the side projecting member 25 and When the tip portion of the downward protruding portion 27 has a rod shape or a plate shape parallel to the protruding movement direction, the lower protruding portion 27 bites into the inner wall or the bottom portion of the groove 4.

The return pipe 3 is provided at the center of the rear surface of the pressure device 6.
0 is provided, and in the illustrated embodiment, a plurality of return pipes 30 having different lower end opening levels are provided. The upper end of the return pipe 30 is located on the ground, and the input hopper 31 is provided at the upper end of the return pipe 30.
1. The return pipe 30 constitutes the return device 16. In addition, a vibrator 32 is provided on each side of the rear surface of the pressure device 6.
Is provided.

On the ground, there is provided a sieving means 13 for sieving the excavated earth and sand 5 excavated on the ground by the spiral portion 1 of the rotary shaft 2 to obtain one having a certain particle size or less. Below, a mixing device 15 for stirring and mixing the excavated soil 5 and the ground improvement material which have been sieved is provided. The mixture 7 mixed by the mixing device 15 is supplied to the input hopper 31.

Underground continuous wall forming apparatus A having the above-mentioned structure
Using, the underground wall is continuously formed as follows. That is, first, a hole into which the multi-axis excavation and hoisting device 3, the partitioning member, the pressure-resistant device 6, and the like of the above-mentioned underground continuous wall forming device A can be inserted is formed in the ground 35 by an arbitrary excavating means. In this case, when excavating the hole, it is advisable to excavate by conventionally known vertical excavation.

In this way, after drilling a hole in the ground 35 (this hole will form the starting end of the groove 4 to be formed later), the multi-axis drilling of the underground continuous wall forming apparatus A is carried out in the hole. The hoisting device 3, the partition member 9, the pressure resistant device 6 and the like are inserted. At the time of this insertion, the cylinder device 23 constituting the horizontal force applying device 14 is inserted in a contracted state. Thus, with the device inserted into the hole, the pressure-resistant device 6 is fixed to the inner wall or the bottom of the hole by the fixing means 12 provided in the pressure-resistant device 6. That is, the cylinder device 24 is driven to press the side projecting member 25 into contact with the inner wall of the hole, or the cylinder device 26 is driven to press the lower protrusion 27 into contact with the bottom of the hole. Alternatively, the pressure-resistant device 6 is fixed to the inner wall or the bottom of the hole.

Next, the plurality of rotary ordinates 2 constituting the multi-axis excavation and hoisting device 3 are rotated and the cylinder device 23 constituting the horizontal force imparting device 14 is extended, whereby the multi-axis excavation and hoisting device 3 is extended. A horizontal force for advancing in the lateral direction (direction in which a plurality of rotary ordinates 2 are aligned in a row) is applied, and the spiral portion 1 provided on the rotary ordinate 2 located at the foremost end vertically and vertically extends the ground 35 in the advancing direction. The trench 4 is excavated over to form the trench 4, and the excavated soil is unloaded on the ground by the plurality of rotary ordinates 2 having the spiral portion 1. In this case, when the soil is unloaded to the ground, it is unloaded by the plurality of rotary ordinates 2,
Even if the excavated earth and sand are clogged in the spiral portion 1 of the single rotating vertical axis 2, the remaining rotating vertical axis 2 can smoothly lift up the soil.

The reaction force when the cylinder device 23 constituting the horizontal force applying device 14 is extended to apply a horizontal force to the multi-axis excavating and hoisting device 3 is caused by the pressure device 6 fixed to the inner wall or bottom of the hole. It is reliably supported, and as a result, the horizontal force imparting device 14 can reliably impart a horizontal force to the multi-axis excavation hoisting device 3 to advance the multi-axis excavating hoisting device 3.

When excavating the ground 35 in the traveling direction by rotating the rotating vertical axis 2 while applying a horizontal force, air or water is ejected from either or both of the jet portion 17 and the jet portion 17 '. It is made easy and the excavated soil 5 is loosened so that it is easy to be excavated. When the cylinder device 23 forming the horizontal force applying device 14 is fully extended, the fixing of the pressure resistant device 6 by the fixing means 12 is released (that is, the cylinder device 2).
4 and the cylinder device 26 are contracted to release pressure contact and bite into the inner side wall and the bottom of the holes of the lateral protrusions 25 and the lower protrusions 27), and the cylinder device 23 is contracted in this state to Partition member 9 side (that is, multi-axis excavation and excavation device 3
Side) to move forward.

Next, when the pressure device 6 is advanced and the cylinder device 23 is contracted, the pressure device 6 is again fixed to the inner wall or bottom of the groove 4 by the fixing means 12, and in this state, The device 24 is extended, thereby applying a horizontal force for advancing the multi-axis excavation and hoisting device 3 in the lateral direction (direction in which a plurality of rotating vertical axes 2 are arranged in a line), and the rotating vertical axis 2 located at the foremost end. The spiral portion 1 provided in the
Excavation over the entire length in the vertical direction to form the groove 4,
The excavated earth and sand 5 are excavated on the ground by a plurality of rotary ordinates 2 having a spiral portion 1.

By the way, the excavated earth and sand 5 excavated on the ground is sifted by the sieving means 13 and the excavated earth and sand 5 sifted to a certain size or less is supplied to the mixing device 15, and the ground improvement material is mixed in the mixing device 15. To be done. Here, as the ground improvement material to be used, a mixture of cement or other solidifying material and water or other liquid material, or asphalt or rubber in the form of particles or flakes or small blocks is adopted. It In addition, as will be described later, underground walls for blocking harmful substances that flow out with groundwater from industrial waste treatment plants and places where harmful substances are generated, and underground dams for blocking the reverse flow of seawater formed near the coast. When forming a basement wall or the like for use as a ground improvement material, a material having excellent acid resistance or salt resistance can be used.

Then, the mixture 7 mixed by the mixing device 15 is supplied to the charging hopper 31 and returned from the charging hopper 31 into the groove 4 via the return pipe 30. The mixture 7 returned to the groove 4 is filled in the void of the groove 4 generated by the pressure-resistant device 6 being pulled toward the partition member 9 side (that is, the multi-axis excavating and discharging device 3 side) and moving forward. Will be. Here, the vibration is applied to the mixture 7 by the vibrator 32 to pack the mixture 7 in a uniform state like a gap.

The subsequent operation is such that the fixing of the pressure-resistant device 6 described above, the operation of contracting the cylinder device 24, the fixing of the pressure-resistant device 6 and the operation of extending the cylinder device 24 are repeated.
During that time, the excavated earth and sand 5 is discharged to the ground, and the discharged excavated earth and sand 5 is passed through a sieve and the mixture 7 mixed with the ground improvement material is returned to the groove 4, thereby continuously operating in the lateral direction. Then, the groove 4 is formed and the formed groove 4 is filled with the mixture 7 of the excavated soil 5 and the ground improvement material.

1 (a) (b) and 3 (a) (b), the cylinder device 23 is contracted and the pressure-resistant device 6 is fixed when the rotary axis 2 is biaxial or triaxial, respectively. 2 shows a vertical sectional view and a horizontal sectional view in a state not shown in FIG.
(A), (b), 43 (a) and (b) show a longitudinal sectional view and a lateral sectional view in a state where the pressure device 6 is fixed and the cylinder device 23 is extended in the state of FIGS. is there.

The grooves 4 are continuously formed as described above. In this case, in the present invention, the rotation vertical axis 2 arranged in a row in the lateral direction is normally rotated and reversely rotated. The force that the multi-axis excavation hoisting device 3 attempts to rotate in the horizontal plane as a whole cancels each other out (or the force that the multi-axis excavation hoisting device 3 attempts to rotate in the horizontal plane as a whole is reduced. As a result, a multi-axis excavation and hoisting device 3 configured by horizontally arranging a plurality of rotary ordinates 2 side by side in a row
In a direction in which a plurality of rotating vertical axes 2 are arranged side by side.
4 is applied with a horizontal force to move forward, the multi-axis excavation and hoisting device 3 which is not affected by the rotation of the rotary vertical axis 2 (or is hardly affected by the rotary) is arranged in parallel with the plurality of rotary vertical axes 2. It will be possible to move straight forward in the installation direction.

Further, since the plurality of rotation ordinates 2 are arranged side by side in a row, the length of the entire device in the traveling direction becomes long, and this also makes it difficult for the entire device to rotate in the horizontal plane in the ground, and more. This means that the shaft excavation and hoisting device 3 can be advanced straight in the direction in which the plurality of rotary ordinates 2 are arranged in parallel. Then, in the present invention, the groove 4 is formed as described above.
When excavating continuously, the advancing direction adjusting device 8 is adjusted so that the multi-axis excavating and discharging device 3 can be advanced more accurately. That is, the cylinder device 21 is adjusted to adjust the contact state of the grooves 4 formed in the ground 35 at the front and rear of the sled 22 with the side walls, whereby a plurality of rotating vertical axes 2 arranged side by side in a row. The direction of travel can be corrected to a more accurate direction.

The partition member 9 is composed of the earth and sand 5 excavated by the multi-axis excavation and hoisting device 3 and the returned mixture 7 in the ground.
Is partitioned by a partition member 9 so as not to mix in the ground, but a non-self-hardening liquid such as bentonite or slag grout that does not harden by itself in the gap between the partition member 9 and the pressure resistant device 6. An object 10 may be put in to prevent the inner wall of the groove 4 from collapsing between the partition member 9 and the pressure resistant device 6. The non-self-curable liquid substance 10 placed between the partition member 9 and the pressure resistant device 6 is the cylinder device 24.
When the pressure resistant device 6 approaches the partition member 9 due to contraction, the liquid level rises, and when the cylinder device 24 extends and the pressure resistant device 6 separates from the partition member 9, the liquid level lowers.

When mixing the excavated soil 5 and the ground improvement material in the mixing device 15 on the ground, when cement or other solidifying material is used as the ground improvement material, it is returned into the formed groove 4. The filled mixture 7 is one which hardens to form a hardened underground wall such as a soil cement hardened body, and as a ground improvement material, asphalt, particles or flakes or small blocks. When an elastic material such as rubber is used, the mixture 7 returned and filled in the formed groove 4 contains asphalt components and rubber in the ground, and the asphalt components and rubber cause earthquakes, etc. The external force acting on the ground can be absorbed by the elasticity of the ground improvement material. When using asphalt or particulate or strip rubber or small block rubber, etc., these may be used alone as a ground improvement material, but with asphalt or particulate or strip rubber or small block rubber, etc. It may be used as a ground improvement material by mixing with cement milk or other solidifying material. Here, when the ground is improved by using asphalt, rubber in the form of particles, strips, or small pieces alone, the transmission of seismic force to the structure formed on the ground improved part is attenuated. . In addition, if asphalt or particulate or strip-shaped or small rubber is mixed with cement milk or other solidifying material and it is used as a ground improvement material, it will become an underground structure such as an underground wall. It is possible to prevent the occurrence of cracks and reliably prevent the infiltration of groundwater.

In order to prevent the harmful substances flowing out from the disposal site of the industrial waste or the place where the harmful substances are generated from flowing out together with the groundwater, the underground wall is formed to block the water. When mixing the excavated soil 5 and the ground improvement material in 15, a ground improvement material having excellent acid resistance is used as the ground improvement material. As a ground improvement material having excellent acid resistance, for example, sulfate resistant cement can be used. That is, conventionally, in the soil cement underground wall that mixes the excavated earth and sand of the field board and the cement milk, Portland cement was used as the cement to be used, but in the present embodiment, it is resistant to the cement used. It uses sulphate cement. Then, the excavated earth and sand 5 discharged on the ground and a sulfate-resistant cement that is an acid-resistant ground improvement material are mixed by a mixing device 15 on the ground to prepare a mixture 7 of acid-resistant homogeneous soil cement, The mixture 7 is returned to the formed groove 4 and the mixture 7 is hardened to form an underground wall made of a homogeneous soil cement hardened body having acid resistance. The ground wall thus formed not only has a uniform hardening state of soil and cement in each part, but also has excellent acid resistance as described above as cement (that is, chemical resistance to acid). Since it uses sulfate resistant cement (which has high resistance), the underground wall of soil cement does not deteriorate even if it is exposed to harmful substances, especially strong acid for a long period of time. The walls are more permeable than water as compared to concrete, so it is possible to prevent the underground wall of soil cement from being deteriorated by being invaded from the inside by harmful substances that have penetrated into the underground wall along with groundwater for a long period of time. It is possible to prevent the underground wall from being deteriorated by harmful substances over a long period of time and causing breaks or holes through which groundwater passes.

In the above-mentioned embodiment, an example of using the sulfate resistant cement as the ground improving material is shown, but water glass can also be used as the ground improving material. In this case, the excavated earth and sand 5 discharged to the ground and water glass which is an acid-resistant ground improvement material are mixed by a mixing device 15 on the ground to prepare a mixture 7, and the mixture 7 is placed in the groove 4 formed. It is returned and forms a homogeneous underground wall containing water glass. The underground wall thus formed contains water glass so that it is not easily deteriorated by harmful substances including acid, and is broken by harmful substances for a long period of time and breaks or holes through which groundwater passes. It is possible to prevent such problems.

When an underground dam is formed near the coast by forming an underground wall in the ground and groundwater is collected in the underground dam to take groundwater as drinking water, industrial water, agricultural water, etc., The underground wall prevents the seawater from flowing backward, but the underground wall is in contact with the seawater for a long period of time, and the salt in the seawater degrades the underground wall, causing cracks and holes and There is a risk of backflow after passing through the underground wall, but when forming an underground wall near such a coast, use a ground improvement material with excellent salt resistance. As the soil-resistant ground improvement material, for example, alumina cement having a large chemical resistance to seawater can be used. Then, the excavated earth and sand 5 discharged on the ground and alumina cement which is a salt-resistant ground improvement material are mixed on the ground 1
5 to prepare a homogeneous soil cement mixture 7 having salt resistance, and the mixture 7 is returned into the formed groove 4 and the mixture 7 is cured so that the salt 7 has a uniform soil resistance. It forms the underground wall of hardened cement. Then, the ground wall formed in this way is not only homogeneous in the hardening state of soil and cement in each part, but since it uses alumina cement having salt resistance as described above as cement, The soil cement underground wall does not deteriorate even if it is exposed to salt in seawater for a long period of time. In particular, the soil cement underground wall is more permeable to water than concrete. It is possible to prevent the underground wall of soil cement from invading and deteriorating due to the salt content in the seawater that penetrates into the wall, and the underground wall of soil cement deteriorates due to seawater for a long period of time and the seawater flows backward. It is possible to prevent tears and holes from occurring.

In each of the above-mentioned embodiments, sulfate resistant cement, water glass,
Although alumina cement has been exemplified, it goes without saying that the ground improvement material having a large chemical resistance to harmful substances is not limited to this. A substance having a large chemical resistance to other harmful substances such as heavy metals can also be used as the ground improvement material.

[0042]

According to the first aspect of the present invention, in constructing a vertical underground continuous wall having a constant width in the ground, a plurality of rotary ordinates provided with spiral parts in the ground are provided. A horizontal force is applied in a horizontal direction to the multi-axis excavation hoisting device that is lined up in a row to move the multi-axis excavating hoisting device laterally to form a groove, and the spiral part discharges the excavated soil to the ground. Then, the reaction force of the horizontal force laterally applied to the multi-axis excavating and hoisting device is supported by a pressure device that is inserted into the ground, and after pushing the multi-axis excavating and hoisting device for a certain length in the lateral direction, The device is moved to the multi-axis excavation and hoisting device side, and then a horizontal force is applied to the multi-axis excavation and hoisting device in the lateral direction again to move the multi-axis excavation and hoisting device laterally to form a groove. Along with this, the spiral part discharges the excavated soil to the ground, and the reaction force of the horizontal force applied to the multi-axis excavation hoisting device in the lateral direction It is supported by the pressure resistant device that has been put in, and during the above series of steps, the mixture obtained by mixing the ground improvement material with the excavated earth and sand discharged above the ground is returned to the groove behind the pressure resistant device, so multi-axis drilling While applying a horizontal force to the hoisting device, the horizontal force can be supported by the pressure device to easily and smoothly advance the multi-axis excavating hoisting device. As a result,
In returning the mixture mixed on the ground into the groove as in the conventional case, it does not require a large pressure for advancing the device, and in this way, the horizontal force is applied to the multi-screw excavation device. Since this reaction force is supported by the pressure device, the ground in the traveling direction can be excavated with a large force by the spiral portion of the rotating vertical axis located at the tip of the multi-axis excavation and hoisting device. Excavation is possible even without special excavation claws on the outer circumference, and the rotating vertical axis without excavation claws on the outer circumference of the spiral part that is generally used for vertical excavation is used as it is. It is also possible to use it as a device for horizontal excavation and hoisting (of course, it can also be used with a drilling claw), and since the rotating vertical axis is lined up horizontally , Longitudinal direction of multi-axis excavation and hoisting equipment The made long, there is a whole apparatus can be a rotating Pile structure is one which can be straight drilling. In addition, since a plurality of rotary ordinates having a spiral portion are arranged in a row in the traveling direction, even if the digging of earth and sand is clogged by one rotary ordinate (particularly the longitudinal ordinate of the front end in the advancing direction), The rest of the vertical axis of rotation makes it possible to unload smoothly, and excavation and unloading can be done smoothly.

Further, in addition to the effect of the invention described in claim 1, in the invention described in claim 2, a multi-axis excavation hoist in which a plurality of rotating vertical axes provided with a spiral portion are arranged side by side in a row. When a horizontal force is applied to the soil equipment in the lateral direction to move the multi-axis excavation hoisting equipment in the lateral direction to form a groove, the rotation directions of the plurality of rotation vertical axes are made different, so The rotations cancel or reduce the forces that rotate the individual multi-axis excavation hoisting machines in the horizontal plane, and the forces that try to rotate the entire multi-axis excavation hoisting machine in the horizontal plane are reduced. The multi-axis excavation hoisting device can be advanced straight when the horizontal force is applied to the multi-axis excavation hoisting device to advance it in the direction in which a plurality of rotating vertical axes are arranged in parallel.

According to the invention of claim 3, in addition to the effect of claim 1 or claim 2, multi-axis excavation in which a plurality of rotating vertical axes provided with a spiral portion are arranged side by side in a row. When a horizontal force is applied to the hoisting device in the lateral direction to move the multi-axis excavating hoisting device in the lateral direction to form a groove, the horizontal advancing direction of a plurality of horizontally aligned rotating vertical axes is adjusted. A traveling direction adjusting device is provided to adjust the traveling direction by the traveling direction adjusting device, and the multi-axis excavation hoisting device is moved laterally to form a groove. The advancing direction of the earthmoving device can be adjusted, and the multiaxial excavation hoisting device can be advanced more accurately.

According to the invention of claim 4, in addition to the effect of the invention of claim 1, the earth and sand excavated by the multi-axis excavation and excavator and the returned mixture are ground. Since the partition member divides the mixture so that it does not mix in the interior, the excavated soil that is not excavated in the ground does not mix with the mixture, and a high-quality underground wall can be formed.

According to the invention of claim 5, in addition to the effect of the invention of claim 4, the partition member is arranged between the multi-axis excavation and excavation device and the pressure resistant device. Since a non-self-curing liquid material that does not cure by itself, such as bentonite or slag grout, is put between the pressure resistant device and the pressure resistant device, the inner wall of the groove is prevented from collapsing between the partition member and the pressure resistant device. In addition, since it is a non-self-curing liquid material, it does not hinder the movement of the horizontal force applying device that connects the partition member and the pressure resistant device.

According to the invention of claim 6, in addition to the effect of the invention of claim 1, air or water is ejected at the time of excavation by a multi-axis excavation hoisting device. It facilitates excavation and loosens excavated sediment to facilitate excavation. According to the invention of claim 7, in addition to the effect of the invention of claim 6, a plurality of rotating vertical axes are rotatably connected by a connecting member, and air or water is supplied from the tip of the connecting member. Since it ejects toward the front, it is possible to excavate the traveling direction of the multi-axis excavation device with air or water, and to inject air or grooves into both inner side walls of the groove to cause collapse of both inner side walls. There is no such thing.

Further, in addition to the effect of the invention described in claim 1, in the invention described in claim 8, the pressure device is fixed to the side wall of the groove or the bottom of the groove. Means for supporting the reaction force of the horizontal force laterally applied to the multi-axis excavation hoisting device with the pressure-resistant device fixed to the side wall of the groove or the bottom of the groove by the fixing means. The reaction force of the horizontal force laterally applied to the soil device can be reliably supported by the pressure device, and the multi-axis excavation and excavation device can be advanced with a large force.

According to the invention of claim 9, in addition to the effect of the invention of claim 1, large particles in the excavated earth and sand are removed by sieving the excavated earth and sand discharged to the ground by sieving means. Is removed, and then the ground improvement material is mixed, so that it is possible to obtain a mixture of the desired strength on the ground, and by returning this to the groove, a continuous wall of the desired strength is underground. It can be formed into.

According to the tenth aspect of the invention,
In addition to the effect of the invention described in claim 1, when the mixture obtained by mixing the ground improvement material with the excavated earth and sand discharged above the ground is returned into the groove behind the pressure resistant device, the mixture is mixed in the groove. By applying vibration for packing so that there are no voids, it is possible to form a uniformly packed underground wall without forming voids in the formed underground wall.

According to the invention of claim 11,
In addition to the effect of the invention according to claim 1, the ground improvement material mixed on the ground with the excavated earth and sand discharged above the ground has acid resistance. Even though it is a formed underground wall, each part of the underground wall has a uniform composition and shows strong chemical resistance to acid, and even if it is exposed to acid for a long period of time, it will be The underground wall formed by the mixture with the ground improvement material does not deteriorate and cracks or holes are formed, and the underground wall stably and reliably shields groundwater containing harmful substances for a long period of time. It is possible to reliably prevent the substances that cause environmental deterioration from spreading in the ground.

According to the twelfth aspect of the invention,
In addition to the effect of the invention as set forth in claim 1, the ground improvement material mixed on the ground with the excavated earth and sand discharged above the ground has salt resistance. Even though it is a formed underground wall, each part of the underground wall has a uniform composition and shows strong chemical resistance to salt, and even if it is exposed to seawater for a long period of time, it will not be equivalent to the excavated soil of the local rock. The underground wall formed by the mixture with the ground improvement material does not deteriorate and cracks or holes are formed, and the underground wall can reliably and reliably block seawater for a long period of time, preventing backflow of seawater. It is possible.

Further, in the invention of claim 13,
In addition to the effect of the invention described in claim 1, the ground improvement material mixed on the ground with the excavated earth and sand discharged on the ground has elasticity like rubber, so that the external force of the earthquake is more effective on the underground wall itself. Can be absorbed, for example, when a structure is formed on the ground improvement part, the vibration acting on the structure formed on it is damped, or when the underground wall stops the water, It is possible to prevent cracks from occurring due to an earthquake.

According to the invention of claim 14,
A device for constructing a vertical underground continuous wall of a certain width in the ground, wherein the rotating vertical axes having spiral parts are arranged in a row in the lateral direction and the rotating directions of the plurality of rotating vertical axes are made different. And a horizontal force applying device for applying a horizontal force for pushing the multi-axis excavating and hoisting device in the lateral direction in which a plurality of rotating vertical axes are arranged, and the horizontal force. Pressure device that will be a reaction force member of the above, a mixing device for mixing ground improvement material on the ground and soil that has been excavated, and a returning device for returning the mixture mixed by the mixing device into the groove. And a device capable of filling a mixture having desired strength or desired performance into the groove while forming a groove by excavating straight in the traveling direction and smoothly unloading. It can be easily configured.

[Brief description of the drawings]

1A and 1B are a vertical cross-sectional view and a horizontal cross-sectional view showing a state in which a jack device is contracted and a partition member and a pressure resistant device are brought close to each other during construction of an embodiment of the present invention.

2 (a) and 2 (b) are a vertical cross-sectional view and a horizontal cross-sectional view showing a state in which the jack device is extended and the partition member and the pressure resistant device are separated from each other during the same construction.

3 (a) and 3 (b) are a vertical cross-sectional view and a horizontal cross-sectional view showing a state in which the partitioning member and the pressure resistant device are brought close to each other by contracting the jack device during the construction of another embodiment of the present invention.

4 (a) and 4 (b) are a longitudinal sectional view and a lateral sectional view showing a state in which the jack device is extended and the partition member and the pressure resistant device are separated from each other during the same construction.

FIG. 5 is a cross-sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spiral part 2 Rotating vertical axis 3 Multi-axis excavation and hoisting device 4 Groove 5 Excavation and sediment 6 Pressure-resistant device 7 Mixture 8 Moving direction adjusting device 9 Partitioning member 10 Non-self-curing liquid material 11 Connecting member 12 Fixing means 13 Sieve means 14 Horizontal Power application device 15 Mixing device 16 Return device

Claims (14)

[Claims] 1. A multi-axis excavation hoisting device in which a plurality of rotating vertical axes provided with spiral portions are arranged side by side in a row in constructing a vertical continuous underground wall having a certain width in the ground. A horizontal force is applied in the lateral direction to move the multi-axis excavation hoisting device in the lateral direction to form a groove, and at the same time the excavated earth and sand is discharged to the ground by the spiral part and applied to the multi-axis excavating hoisting device in the lateral direction. After supporting the reaction force of the horizontal force by the pressure device inserted into the ground and pushing the multi-axis excavation device for a certain length in the lateral direction, move the pressure device to the multi-axis excavation device side, and then Again, a horizontal force is applied to the multi-axis excavation hoisting device in the lateral direction to move the multi-axis excavating hoisting device in the lateral direction to form a groove and at the same time the excavated earth and sand are discharged to the ground by the spiral part. The reaction force of the horizontal force laterally applied to the shaft excavation and hoisting device is supported by the pressure device inserted into the ground, During the process, a multi-axis continuous underground wall construction method is characterized in that the mixture obtained by mixing the ground improvement material with the excavated soil discharged above the ground is returned into the groove behind the pressure resistant device. 2. A horizontal force is applied in a lateral direction to a multi-axis excavation hoisting device in which a plurality of rotating vertical axes provided with a spiral portion are arranged side by side in a row to move the multi-axis excavating hoisting device laterally. The method for continuously constructing a multi-axis underground wall according to claim 1, wherein a plurality of rotating longitudinal axes are made different in rotating direction when forming the groove. 3. A horizontal force is applied to a multi-axis excavation hoisting device in which a plurality of rotating vertical axes provided with a spiral portion are arranged side by side in a horizontal direction to horizontally move the multi-axis excavating hoisting device. To form a groove, a traveling direction adjusting device is provided to adjust the traveling direction of the horizontal axis of a plurality of rotating vertical axes, and multi-axis excavation is performed while adjusting the traveling direction by the traveling direction adjusting device. The method for continuously constructing a multiaxial underground wall according to claim 1 or 2, wherein the soil hoisting device is moved laterally to form a groove. 4. The partition member is used to partition the earth and sand excavated by the multi-axis excavation and excavation device and the returned mixture in the ground so that they do not mix in the ground.
The described multi-axis underground wall continuous construction method. 5. A non-self-curing liquid such as bentonite or slag grout that does not cure by itself, such as a bentonite or a slag grout, wherein the partition member is disposed between the multi-axis excavation hoisting device and the pressure device. 5. A multiaxial underground wall continuous construction method according to claim 4, characterized in that a material is put therein. 6. The air or water is ejected when excavating and hoisting by the multi-axis excavating and hoisting device.
The described multi-axis underground wall continuous construction method. 7. The multi-axis type ground according to claim 6, wherein a plurality of rotating vertical axes are rotatably connected by a connecting member, and air or water is jetted forward from the tip of the connecting member. Medium wall continuous construction method. 8. The pressure-resistant device is provided with fixing means for fixing the pressure-resistant device to the side wall of the groove or the bottom of the groove, and the pressure-resistant device is fixed to the side wall of the groove or the bottom of the groove by the fixing means. The method for continuously constructing a multiaxial underground wall according to claim 1, wherein a reaction force of a horizontal force laterally applied to the multiaxial excavation and hoisting device is supported. 9. The multiaxial according to claim 1, wherein the excavated earth and sand discharged on the ground are sieved by a sieving means to remove large particles in the excavated earth and sand, and then the ground improvement material is mixed. Type underground wall continuous construction method. 10. When the mixture obtained by mixing the ground improvement material with the excavated earth and sand discharged above the ground is returned into the groove behind the pressure resistant device, the mixture is packed in the groove without any voids. The multiaxial continuous underground wall construction method according to claim 1, wherein vibration is applied. 11. The multiaxial underground according to claim 1, wherein the ground improvement material mixed with the excavated soil discharged above the ground has acid resistance. Continuous wall construction method. 12. The multiaxial underground according to claim 1, wherein the ground improvement material mixed with the excavated soil discharged above the ground has salt resistance. Continuous wall construction method. 13. The multi-axis according to claim 1, wherein the ground improvement material mixed on the ground with the excavated soil discharged on the ground has elasticity like rubber. Type underground wall continuous construction method. 14. A device for constructing a vertical underground continuous wall having a constant width in the ground, wherein the rotational vertical axes having a spiral portion are arranged in a row in the lateral direction, and the rotational directions of the plurality of rotational vertical axes are set. And a horizontal force application device for applying a horizontal force for pushing the multi-axis excavation device in the lateral direction in which a plurality of rotating vertical axes are arranged. And a pressure device that serves as a reaction force member for the horizontal force, a mixing device for mixing ground improvement material on the ground with soil that has been excavated, and a mixture mixed by the mixing device returned to the groove. A multi-axis underground wall continuous forming device, which is provided with a returning device for inserting.