JPH0762344B2 - 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 problems of the above-mentioned conventional example, and its purpose is to make a flow of a mixture of earth and sand to be re-ejected and ejected again and earth and sand consolidating liquid. 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. The soil of the ground and the liquid material for solidification are stirred and mixed, and the mixture 2 of the earth and sand and the liquid material for solidification that have overflowed above the ground is re-kneaded by the kneading device 3 and the fluidity is maintained again while maintaining the fluidity. It is characterized by spouting inside.

When the mixture 2 of the earth and sand overflowing above the ground and the liquid material for consolidation is re-kneaded by the kneading device and jetted again into the ground while maintaining the fluidity, a new consolidation is carried out. It is also preferable that the liquid substance is added and readjusted and then ejected 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, and further, kneading By re-kneading with the device 3 and spraying again into the ground while maintaining fluidity, it is no longer necessary to add a large amount of water for fluidization as in the conventional method. It is possible to prevent the strength from weakening due to an increase in the amount of water to be used. In addition, since it has high fluidity, it does not become clogged in the pipe when it is jetted again and recycled. It has become possible to re-eject. 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 the earth and sand overflowing above the ground and the liquid for consolidating is re-kneaded by the kneading device 3 and jetted again into the ground while maintaining the fluidity, a new solidification occurs. In the case where a liquid substance for use is added and readjusted and then jetted out into the ground, the liquid can be adjusted again so as to have a desired predetermined strength and then jetted again.

[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 a kneading device, which is installed on the ground. When the kneading device 3 remixes the mixture 2 of the earth and sand and the liquid material for solidification, it is already coagulated. It is designed to release the setting of the starting mixture 2 and consequently prevent the deterioration of the fluidity. In the figure, reference numeral 14 denotes a mixture 2 of the liquid for solidification and the earth and sand whose fluidization is maintained by mechanically releasing the solidification by the kneading device 3 from the kneading device 3 to the liquid for solidification supply device 13. It is a supply hose for supplying. Here, a device in which the kneading device 3 is attached to the front part of the consolidating liquid supply device 13 may be used.
As the kneading device 3, for example, as shown in FIG.
By rotating a, the mixture 2 of earth and sand and the liquid material for consolidation is passed through the roller 3a, whereby the condensation of the mixture 2 which has already started to be condensed by the claws of the roller 3a is mechanically performed. It is released and kneaded to maintain fluidity. As the kneading device 3, a plurality of rotating rollers 3a provided with a large number of claws are arranged in a kneading housing 15 having an inlet and an outlet as shown in FIG. 2, and the adjacent rotating rollers 3a are vertically displaced. Alternatively, kneading may be performed while passing the mixture 2 of the earth and sand and the liquid material for consolidation between the adjacent rotating rollers 3a. Rotating roller 3a
The outer peripheral portion may be provided with gears or spiral blades.

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 of the original ground and the liquid material for solidification overflows to the ground surface according to the excavation, but the mixture 2 of the earth and sand and the liquid material for solidification overflowing on the ground surface is kneaded. In the state where the setting is mechanically released and kneaded by the device 3 and the fluidity is maintained, it is sent to the setting liquid supply device 13 and mixed with a setting liquid such as new cement milk. Then, it is jetted again from the jet port 8 of the excavation shaft 1 via the hose 12. In this case, the concentration of the liquid material for consolidation such as new cement milk to be mixed should be adjusted appropriately before use.
For this reason, it is preferable that the concentration is designed to be a predetermined value. Further, when the mixture 2 of the liquid for solidification and the sand and sand mixed so as to maintain the fluidity by the kneading device 3 has a concentration within a predetermined range, the hose is added without adding a new liquid for solidification. It may be ejected from the ejection port 8 of the excavation shaft 1 via 12. 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, by recycling the mixture 2 of earth and sand and the liquid material for consolidation as described above, it is not necessary to dispose of the material overflowing above ground as industrial waste, or Also, a small amount of disposal is sufficient.

By the way, in the above-mentioned method, upon recycling, the mixture of the excavated earth and sand overflowing on the ground and the condensing liquid substance such as cement milk has already started to harden. Since the fluidity is poor, if it is recycled as it is, it may become clogged in the pipe. Can be fluidized by adding a small amount of water without adding water, or even by adding water to the liquid material for solidification starting with, which allows recycling without clogging in the pipe. is there.
In addition, since it is not designed to add a large amount of water for fluidization for recycling, the amount of water used can be controlled to the required amount in design, and as a result, adding a large amount of water improves strength. Not only is it prevented from weakening, but it is possible to form a ground improvement product whose strength is controlled to a desired level. In addition, since the fluidity is secured from the beginning without adding a coagulation retarder, etc.,
It eliminates the risk of significantly slowing the cure in the ground.

[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. The mixture of the solidifying liquid and the solidifying liquid is re-kneaded by a kneading device and jetted again into the ground while maintaining the fluidity. The mixture can be recycled, effective use of resources can be achieved, and it is not necessary to dispose of overflowing substances on the ground as industrial waste, or even if it is disposed, the amount of disposal can be small and the cost can be significantly reduced. In addition, since it is re-kneaded by a kneading device and jetted again into the ground while maintaining fluidity, it is formed compared to one that secures fluidity by adding a large amount of water for recycling. The strength of the ground improvement product becomes stronger. In addition, it is easier to control the strength compared to adding a large amount of water for fluidization.Because it has fluidity, it can be injected into the pipe when it is jetted again and recycled. It can be re-spouted smoothly without clogging, improving the workability. Furthermore, the method is simple because it can be mechanically kneaded by a kneading device, and it can be solidified with the soil of the original ground. The kneading with the working solution can be accurately controlled on the ground, and the hardening in the ground does not significantly slow down compared to the case where a solidification retarder is added from the beginning, and the construction period is short. It is possible.

When a mixture of earth and sand overflowing on the ground and a liquid for solidification is re-kneaded by a kneading device and jetted again into the ground while maintaining fluidity, a new liquid for solidification is obtained. In the case of ejecting into the ground after re-adjusting by adding an object, in addition to the above effect, it is possible to more accurately adjust and re-eject so as to have a predetermined strength, and as a result, The ground improvement product that is formed can be controlled to an accurate strength extremely close to the design strength.

[Brief description of drawings]

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

FIG. 2 is a sectional view of another embodiment of the kneading device used in the above.

[Explanation of symbols]

 2 mixture 3 kneading equipment

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 the mixture of the earth and sand and liquid for solidification is kneaded. A method for recycling a mixture of earth and sand and a liquid material for solidifying, which comprises re-kneading with a device and jetting again into the ground while maintaining fluidity. 2. When a mixture of earth and sand overflowing on the ground and a liquid material for solidification is re-kneaded by a kneading device and jetted again into the ground while maintaining fluidity, a new liquid for solidification is obtained. The method for recycling a mixture of earth and sand and a liquid material for consolidation according to claim 1, characterized in that the material is added and readjusted before being ejected.