JPH0762342B2 - Method for recycling a mixture of earth and sand and liquid material for consolidation - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to form a pile-shaped article or a continuous wall in which the pile-shaped article is continuous in the ground, or to spray the liquid material for consolidation into the ground to spray the raw material while improving the ground. The present invention relates to a technique for recycling a mixture of earth and sand and a liquid material for caking when stirring and mixing the earth and sand and a liquid material for a caking.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Publication No. 40813/1986 has been known as a method of constructing a pile-shaped object on the ground. This is for excavating the ground while ejecting cement milk from the lower end of the excavation shaft and advancing while mixing the excavated soil and cement milk to form the primary mixing pile and lowering the excavation shaft to the predetermined position. And a second step of adding cement to the primary mixed soil unloaded on the ground by excavation of the excavation shaft and re-kneading it to create a secondary mixed soil, After the lower end of the excavation shaft reaches a predetermined position in the construction of the primary mixing pile, the secondary mixed soil produced in the second process is extruded from the lower end of the excavation shaft in the excavation hole instead of the cement milk in the first process. The third step is to pull up the excavation shaft while filling the slab and form a pile in which the secondary mixed soil is filled in the excavation hole.

[0003]

In the above conventional example, cement is added again to the mixed soil of the excavated earth and cement milk and the mixture is ejected from the lower end of the excavation shaft to excavate the soil excavated on the ground. We are reusing the mixed soil of earth and sand and cement milk, but in actually doing this, the mixed soil of the excavated earth and cement milk that was unloaded on the ground, the solidification of cement is about to begin, The fluidity is not sufficient to add new cement and eject again from the lower end of the excavation shaft. Therefore, water is added more than necessary to fluidize it and eject it from the lower end of the excavation shaft. As described above, the pipe is not clogged by fluidizing it by adding more water than necessary, but since water is added more than necessary, the strength of the soil cement to be formed becomes weak. On the other hand, it may be considered to add a cement setting retarder to the cement milk from the beginning, but this causes a problem that it becomes harder to set in the ground and the construction period becomes longer.

The present invention has been made in view of the above-mentioned problems of the prior art, and its object is to flow a mixture of earth and sand which is pumped up and re-spouted and a liquid material for consolidation. It prevents the deterioration of the property, and the pipe can be re-spouted smoothly without being clogged in the pipe upon re-spouting.
It is another object of the present invention to provide a method for recycling a mixture of earth and sand and a liquid material for solidification, which prevents the strength from being lowered, and does not delay the setting in the ground and the construction period does not become long.

[0005]

In order to solve the above-mentioned problems, the method for recycling a mixture of earth and sand and a liquid material for caking of the present invention is an original method in which the liquid material for caking is ejected in the ground. It is characterized in that the earth and sand of the ground and the liquid for solidification are stirred and mixed, and the mixture 2 of the earth and sand and liquid for solidification that have overflowed above the ground is fluidized by applying ultrasonic waves and jetted again into the ground. To do.

[0006] Further, when the mixture 2 of earth and sand and the liquid material for solidification overflowing on the ground is applied with ultrasonic waves to be fluidized and ejected into the ground again, a new liquid material for solidification is added and readjusted. After that, it is also preferable to spout it into the ground.

[0007]

According to the present invention of the above-mentioned method, however, the soil and sand of the original ground and the solidifying liquid are agitated and mixed while spouting the solidifying liquid in the ground, and overflowed to the ground. By ejecting the mixture 2 of earth and sand and the liquid material for solidification again into the ground, the mixture 2 of the earth and sand and the liquid material for solidification that overflowed above the ground can be recycled. When jetting into the inside, by applying ultrasonic waves to the mixture 2 of earth and sand overflowing above the ground and the liquid material for consolidation to fluidize it, there is no need to add a large amount of water to achieve fluidization as in the past. As a result, it is possible to prevent the decrease in strength due to the increase in the amount of water used. Moreover, since it has high fluidity, it is jetted again and recycled. In this case, it is possible to smoothly re-spout without clogging the piping. Those were. In addition, the curing in the ground is not significantly delayed as compared with the case where the solidification retarder is added from the beginning.

In addition, when the mixture 2 of earth and sand and the liquid material for solidification overflowing on the ground is applied with ultrasonic waves to be fluidized and ejected into the ground again, a new liquid material for solidification is added and readjusted. For those that erupt into the ground after that, it will be possible to re-adjust to the required strength and erupt into the ground.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings. In the figure, A is an excavator, in which a bit 6 is provided at the lower end of a hollow pipe-shaped excavating shaft 1 which is rotated by a drive device 11, and the excavating shaft 1 is provided with a stirring means 7 such as blades and screw parts. In addition, the jet port 8 is provided at an appropriate position of the bit 6 or the excavation shaft 1. The excavation shaft 1 may be uniaxial or multiaxial.
In the case of multiple axes, they may be arranged in a straight line, or may be arranged in an arbitrary arrangement such as a polygon such as a triangle or a quadrangle, or an arc. Further, in the case of the multi-axis, the upper end of each excavation shaft 1 is connected to the multi-axis device, and the rotation of the drive device 11 is transmitted to each excavation shaft 1 via the multi-axis device. Reference numeral 12 in the drawing denotes a hose that is connected to the excavation shaft 1 in communication. The hose 12 is connected to a consolidating liquid material supplying device 13 for supplying a consolidating liquid material such as cement milk, and the consolidating liquid material is supplied from the consolidating liquid material supplying device 13. It is designed to be supplied to the ejection port 8 of No. 1 and ejected. Reference numeral 3 in the figure denotes an ultrasonic wave imparting device, which mixes the mixture 2 of earth and sand and the liquid material for consolidation into the ultrasonic wave imparting device 3
And then ultrasonically sonicate the mixture of the sediment and the liquid for consolidating to give a slight vibration to the one in the state where coagulation has already begun to delay the coagulation, resulting in a decrease in the fluidity. It is designed to prevent Reference numeral 14 in the figure is for supplying the mixture 2 of the consolidating liquid substance and the earth and sand fluidized by applying ultrasonic waves in the ultrasonic imparting device 3 from the ultrasonic imparting device 3 to the consolidating liquid substance supplying device 13. Supply hose. Further, reference numeral 15 in the figure is a suction unit for sucking the mixture of the earth and sand and the liquid material for consolidation into the ultrasonic wave applying device 3. Here, an apparatus in which the ultrasonic wave applying device 3 is attached to the consolidating liquid material supplying device 13 may be used. Further, an ultrasonic wave applying device may be provided in the middle of the pipe so that the ultrasonic wave may be applied while the mixture 2 of the earth and sand and the liquid material for consolidation flows through the pipe. Mixture of earth and sand and liquid for consolidation 2
It is possible to flow while being continuously fluidized by piping while simultaneously applying ultrasonic waves to fluidize.

Therefore, when excavating the ground 4 by using the excavator A, a cementing liquid such as cement miku or a cementing liquid containing cement as a main component, or any other solidifying liquid from the jetting port 8 is used. It excavates while ejecting objects,
At the same time, the earth and sand of the original ground excavated at the same time and the liquid for solidification are stirred and mixed by the stirring means 7 to form a pile-shaped body made of a mixture of the sand and liquid for solidification in the ground 4. In this case, a part of the mixture 2 of the earth and sand and the liquid material for consolidation overflows to the ground surface as the digging proceeds, but the mixture 2 of the earth and sand and the liquid material for consolidation overflows on the ground surface. 15
Is supplied to the ultrasonic wave applying device 3. Then, ultrasonic waves are applied in the ultrasonic wave applying device 3 to apply a slight vibration to fluidize the liquid material for solidification which has begun to solidify. Then, the mixture 2 of the congealing liquid and the earth and sand which has been fluidized by applying the ultrasonic waves in this way is sent to the consolidating liquid matter supply device 13, and the consolidating liquid matter such as new cement milk is supplied. It is mixed with and is jetted again from the jet port 8 of the excavation shaft 1 via the hose 12. In this case, it is preferable that the concentration of the liquid material for consolidation such as new cement milk to be mixed is appropriately adjusted before use so that the concentration is designed to a predetermined value. Further, when the mixture 2 of the consolidation liquid and the earth and sand fluidized by applying ultrasonic waves has a concentration within a predetermined range, the hose 1 is added without adding a new consolidation liquid substance.
You may make it eject from the ejection port 8 of the excavation shaft 1 via 2. The thus ejected again may be agitated and mixed again in the ground by the agitating means 7, or may not be agitated and mixed again in the ground because it is already mixed in a predetermined state. Re-stirring in the ground may be appropriately selected depending on the situation of the site. In this way, a pile-shaped body is formed in the ground 4 while recycling the mixture 2 of the earth and sand and the liquid material for consolidation, and when the pile-shaped body is continuously formed, It is possible to form a continuous wall in the. Such piles are used as a foundation for an upper structure, or as an underground water stop wall or a mountain stop wall, or as a ground improvement pile. On the other hand, is it necessary to dispose of the material overflowing above ground as an industrial waste by recycling the mixture 2 of earth and sand overflowing above ground and the liquid substance for consolidation?
Alternatively, even if it is disposed of, only a small amount is required.

By the way, in the above method, upon recycling, the mixture of the excavated earth and sand overflowing on the ground and the setting liquid material such as cement milk has already started to harden. Since it has poor fluidity, if it is recycled as it is, it may become clogged in the pipe, but as in the present invention, as in the case of the present invention, the liquid material for consolidation begins to solidify by applying a slight vibration by applying an ultrasonic wave. It can be fluidized without the addition of large amounts of water, which allows it to be recycled without clogging the piping. And, when recycling, water is not added again, or when adding water again, a small amount is sufficient, and it is not what was added in large amount and fluidized as in the past.
The amount of water used can be controlled to the required amount in design,
As a result, not only is it possible to prevent the strength from being weakened by adding a large amount of water, but it is also possible to form a ground improvement product having a target strength controlled. Further, since the fluidity is secured without adding a solidification retarder or the like from the beginning, there is no fear that the hardening in the ground will be significantly delayed.

[0012]

As described above, according to the present invention, the earth and sand of the original ground and the liquid for solidification are agitated and mixed while jetting the liquid for solidification in the ground, and the earth and sand overflowing on the ground. Ultrasonic waves are applied to the mixture of the solidifying material and the solidifying material for fluidization, and the mixture is ejected into the ground again, so that the mixture of the earth and sand of the original ground overflowing on the ground and the solidifying material can be recycled, and In addition to effective utilization, it is not necessary to dispose of overflowing substances on the ground as industrial waste, or even if they are disposed of, the amount of disposal is small, and the cost can be significantly reduced. When jetting out into the ground, ultrasonic waves are applied to the mixture of excavated earth and sand and the liquid material for consolidation to fluidize it, so that a large amount of water is added for recycling to ensure fluidity. Compared with, The strength is stronger, and the strength can be controlled more easily than the case where a large amount of water is added in order to achieve fluidization.Because it has high fluidity, it can be jetted again. When recycled, it can be smoothly re-spouted without clogging the piping, improving workability.Since only ultrasonic waves need to be applied, the device can be simplified. Compared to the case where a solidification retarder is added, curing in the ground does not significantly slow down, and the construction period can be shortened.

Ultrasonic waves are applied to the mixture of the excavated earth and sand and the liquid material for solidification that have overflowed above the ground to fluidize it, and when it is ejected into the ground again, a new liquid material for solidification is added and readjusted. In addition to the above-mentioned effects, it is possible to more accurately adjust and re-eject to the desired strength in the case of ejecting into the ground after that, and as a result, the ground improvement product formed Can be controlled to an exact strength extremely close to the design strength.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of the present invention.

[Explanation of symbols]

 2 mixture

Claims (2)

[Claims] 1. The earth and sand of the original ground and the liquid for solidification are agitated and mixed while ejecting the liquid for solidification in the ground, and ultrasonic waves are added to the mixture of the earth and sand and liquid for solidification overflowing on the ground. A method for recycling a mixture of earth and sand and a liquid material for solidification, which comprises applying fluid to the material to make it fluidize, and then ejecting it again into the ground. 2. A mixture of earth and sand overflowing above the ground and a liquid material for solidification is applied with ultrasonic waves to be fluidized, and when it is ejected into the ground again, a new liquid material for solidification is added and re-adjusted. 2. The gas is ejected into the ground later.
A method for recycling a mixture of the stated earth and sand and a liquid material for consolidation.