JPS5825130B2 - Soft ground improvement method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention uses a rotatable casing rod and a rotating rod that only stirs to effectively supply various hardening agents into the ground and improve the soil efficiently and uniformly while stirring. This relates to improved construction methods.

Conventionally, the method of creating this type of soft ground, as in Japanese Patent Publication No. 48-25768, involves attaching an injection hole and retractable stirring blades to the lower end of a rotating rod, sinking to a predetermined depth, and rotating the rod. There are some devices that can be used for both injection and stirring, as the rod is pulled up and the hardening agent inside the rotating rod is jetted sideways, and the stirring blades installed on the rod are opened to move upward while mixing the soil and hardening agent. Ru.

However, in this case, the curing agent is injected with a single rod and the rod is lifted up while being mixed with a stirring blade, so there is a drawback that mixing may not be sufficient depending on the lifting speed of the rotating rod, and the If the rod is pulled up slowly, there are disadvantages in that it takes a considerable amount of time for construction and that there are many variations in hardness after construction.

In addition, since the injection part and the stirring blade device are configured at the same time under the rotating rod, the structure is very complicated, and the structure is very large, making it troublesome to operate and easy to break down. There are drawbacks.

This invention has solved the above-mentioned drawbacks, and its main components are a soft ground improvement method consisting of a casing rod into which a hardening agent is press-fitted and a rotating rod with stirring blades provided below. A rotating rod is inserted concentrically into the shaft of the casing rod, and has stirring blades at the lower end of the rotating rod that can be opened and closed and have a diameter larger than the diameter of the casing rod in the expanded state. When the casing rod and the rotating rod move up and down, the soil improvement hardening material that was pumped through the insertion part of the casing rod is press-fitted from the lower discharge part, and the plurality of stirring blades provided below the rotating rod are rotated. This invention relates to a method for improving soft ground, which is characterized by creating large-diameter improved soil columns underground by thoroughly stirring and mixing the soil with soft ground.

Therefore, according to the present invention, it is possible to freely adjust the amount of hardening agent pumped, the rotation speed of the hollow rod, etc., and there is an effect that the construction speed corresponding to the ground can be efficiently adjusted.

In addition, the casing rod and hollow rod have the excellent ability to be freely selected in size, and the casing rod only pours out and pressure-feeds the hardening agent while rotating, so the hardening agent is reliably supplied and does not mix with the soil. The hardness is averaged, and there are effects such as sufficiently eliminating variations in hardness.

Moreover, the overall structure can be made as small as possible, and the driving mechanism can be used for both the casing rod and the rotating rod, which has the effect of being extremely economical.

Next, an embodiment of the present invention will be described with reference to the drawings. What is shown in FIG. The casing rod 1 is composed of a rotating rod 3 equipped with a rotational drive mechanism 2, a movable stirring blade 6 mounted below the rotating rod 3, and an expanding device 4. An insertion part 9 is formed into which various hardening agents 14 in the form of grout are press-fitted, and discharge parts 11 of various shapes from which the hardening agents 14 are poured out are provided below.

Furthermore, the casing rod 1 is equipped with an air pipe 10 for feeding compressed air.

The enlarging device 4 also includes stirring blades 6, 6 of the rotating rod 3.
The lower ends of the stirring blades 6, 5 are opened and closed vertically or horizontally by movable parts 5, 5, and a telescopic arm 8, whose other end is fixed to the rotating rod 3, is connected to the middle of the stirring blades 6, 6 by means of a support part 7.

The telescoping arm rod 8 is adapted to be opened and closed horizontally or vertically using a hydraulic jack or other telescoping means.

13 is the soft ground, and 15 is the constructed earth pillar.

This invention has the above-mentioned configuration, and in order to use it now, the casing rod 1 suspended from a crane or the like,
A stirring blade 6 located at the lower part of the zero-rotation rod 3, which is inserted into the soft ground 13 so as to move up and down together with the rotation rod 3;
6 is in an expanded state and can be opened and closed freely, but it is not necessary to maintain the vertical state when descending, and it is also possible to fix it in a horizontally open state.

Further, the rotating rod 3 is constantly rotated and lowered to a desired lowered position.

Next, as shown in FIG.
, 6 are positioned horizontally, and the rotation rod 3 is rotated by the operation of the rotation drive mechanism 2.

The hardening agent 14 injected into the inside of the casing rod 1 is forced out from the discharge part 11 provided below the casing rod 1, and the soil of the soft ground 13 and various hardening agents 14 are mixed with the stirring blade 6,
6 to uniformly stir and mix the mixture, and while continuing the operation while gradually ascending, the casing throat 1 and rotating rod 3 are pulled up to create a large-diameter improved soil column 15 in the soft ground 13.

Soft ground is improved by repeating the above operations at appropriate intervals.

Depending on the geology, it is natural to repeat similar enforcement operations not only when ascending but also when descending.

As described above, this invention consists of a casing rod and a rotating rod, so it has a simple structure and is easy to manufacture. The excellent special effect of being able to adjust the number of rotations of the tube as appropriate, and the ability to determine the lifting speed by selecting the amount of hardening agent pumped and the rotation of the rotating rod, making the hardness of the improved ground uniform, and making it easier for experienced This has the effect of eliminating the need for personnel, etc.

Furthermore, it does not have the drawbacks of a complicated structure and increased size, as in the conventional case where the injection hole and the TJF stirring device are integrally formed on the casing rod or the rotating rod, and the pulling speed of the casing rod and the rotating rod can be increased. It has the excellent feature that it solves the problem of insufficient mixing due to the problem of insufficient mixing.

Moreover, it has the effect of being able to mix the soft ground well and efficiently create stable and uniform improved pillars.

In addition, since the casing rod is only formed with a hardening agent insertion part and a hardening agent discharge part provided at the bottom,
The entire system is compact and can be operated efficiently, which has the effect of fulfilling the role of casing rod injection.

Furthermore, since the rotating rod has a structure in which only the stirring blades are installed at the bottom, the structure is simple and strong, and the rotation is light and reliable, and the rotation speed can be easily adjusted, and the rotation drive mechanism is made as small as possible. Various effects such as miniaturization can be achieved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway side view of the invention, FIG. 2 is a side view of the main part of the enlarging device, FIG. 3 is a plan view, and FIG. A22B and C are explanatory diagrams showing the construction order. 1 is a casing rod, 2 is a rotating drive mechanism, 3 is a rotating rod, 6 is a stirring blade, 9 is an insertion part, 13 is soft ground,
14 is a curing agent.

Claims (1)

[Claims] 1 In a soft ground improvement method consisting of a casing rod into which a hardening agent is press-fitted and a rotating rod with stirring blades provided below, the rotating rod is inserted concentrically into the axis of the casing rod, and its rotation is The lower end of the rod has stirring blades that can be opened and closed and have a diameter larger than the diameter of the casing rod in the expanded state, and when the casing rod and rotating rod move up and down, the ground is pumped from the insertion part of the casing rod. The improved hardening material is press-fitted from the lower discharge part, and the plurality of stirring blades installed below the rotating rod are rotated to thoroughly stir and mix the material with the soft ground, creating a large-diameter improved soil column in the ground. A soft ground improvement method characterized by: