JPS6112052B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The disclosed technology belongs to the field of structural technology for pipe devices that transport powder such as cement as a gas and eject it into improved ground for agitation.

<Summary of the gist> The invention of this application forms a stirred layer by drilling holes in improved ground such as soft ground, and feeds powder such as cement by gas transport through a hollow pipe. This invention relates to an injection agitation pipe device that ejects air from the ejection nozzle of an agitation blade at the tip and mixes with soil, and forms an exhaust path for powder transport gas into the agitated soil, especially in an injection agitation process. A protrusion is provided on the outer surface of the hollow pipe, and another stirring blade is fixed on the upper surface of the stirring blade, and the other stirring blade and the protrusion are integrally connected to ensure exhaustion. This invention relates to a jet agitation pipe device that improves the accuracy of mixing.

<Prior art> As is well known, various techniques have been devised and developed for strengthening and improving soft ground, but methods that use chemicals, such as chemical injection, originally supply chemical solutions to groundwater, making it dry. There are some drawbacks, and in addition, there are regulations regarding its use due to pollution issues.

<Problems to be solved by the invention> Construction methods such as sand drain and chemico pile are so-called consolidation construction methods that drain water, and therefore do not solidify the ground itself.

To deal with this, methods are being considered in which solidified powder such as cement is injected into soft ground in a dry state, mixed and stirred to absorb water in the ground and solidify it. Until now, press-fitting means have not been effective and have disadvantages that have not been realized.

Therefore, the inventors devised and researched a gas transport method for transporting powder, but found that there were various obstacles to the technology of discharging the transport gas to the ground surface after separating it from the powder in the ground. Ivy.

In other words, if the transport gas cannot be vented smoothly, it may remain in the ground and cause a buildup phenomenon.
There is a drawback that uniform dispersion of the powder cannot be achieved.

The purpose of the invention of this application is to solve the above-mentioned problems of powder injection mixing and stirring, and to solve the above-mentioned problems of powder injection mixing and stirring. In addition, protrusions are provided on the outer surface of the hollow pipe to forcibly form an exhaust path for the transport gas to efficiently disperse and stir the powder. It is an object of the present invention to provide an excellent injection stirring pipe device which is useful for the field of ground improvement in the construction industry by allowing smooth exhaust of water.

<Means/effects for solving the problem> In order to solve the above-mentioned problem, the structure of the invention of this application, which is based on the above-mentioned claims, is to provide a hollow ground in the soft ground to be improved. A jet agitation pipe is penetrated through a drilled hole to form a stirring layer of a predetermined diameter, and at a predetermined depth, coagulated powder is fed through the pipe by gas transport, and while the pipe is pulled up, the tip is The jet is ejected into the stirring layer from the jetting pipe of the stirring blade installed at the top of the stirring blade, and mixed with the stirring layer. Meanwhile, another stirring blade formed integrally with the stirring blade on the top surface of the stirring blade is used to stir the stirring layer in the radial direction. In addition, the powder and the transport gas are separated, and the transport gas is made to rise easily from the stirring gap, and the rising gas is caused by the protrusion formed on the outer surface of the injection stirring pipe into the stirring layer. Technical measures have been taken to ensure that the gas is smoothly discharged to the surface of the earth through the forced pores that are formed, and then released into the atmosphere after being depressurized.

<Embodiments - Configuration> Next, embodiments of the invention of this application will be described below based on the drawings. It should be noted that portions in the same manner will be described using the same reference numerals.

In the embodiment shown in FIGS. 1 to 3, reference numeral 1 is an injection stirring pipe device according to the invention of this application, and a cylindrical hollow pipe 2 with a circular cross section is provided with a feeding path 3, and the lower end has a diameter of A stirring blade 4 is integrally provided along the side and extends laterally, and an injection pipe 6 with a powder jet nozzle 5 bored inside the circular arc-shaped cross section is connected to the feed path 3.
It is connected to the.

Separate stirring blades 7 and 7', which are claw-shaped in plan view, are integrally fixed to the upper surface of the stirring blade 4 at predetermined inclination angles outward and inward, respectively, as shown in FIG. ,
The stirring layer rotates inward and outward as shown by white arrows in the rotational direction S of the injection stirring pipe device 1 to perform a stirring action.

In addition, a pair of fins 8, 8 are welded and fixed to opposite sides of the pipe 2 as protrusions that form an exhaust path for the transport gas along the axial direction, and the lower end of the fins 8 is a separate piece as shown in the figure. At the upper portions of the stirring blades 7, 7', downward unexpanded portions 9, 9' are formed at a predetermined height apart.

Note that 10 is the target soft ground, and 11 is a stirring layer in the drilled hole, which is stirred by the stirring blade 4.

Further, 12 is a decompression box, which is set on the surface of the ground 10, and as shown in detail in FIG. A labyrinth seal 15 is provided for the bow 14, and a bearing 16 allows rotation.

In addition, 17 is an exhaust path, and as shown in FIG.
It is formed by

<Embodiment - Effect> In the above configuration, while rotating the injection stirring pipe device 1 via an appropriate drive mechanism (not shown) on the ground, design dynamic pressure or static pressure is applied downward and a swivel position (also not shown) is applied. A hole is drilled in the ground 10 while reducing drilling friction by supplying air as a gas through the inlet, thereby forming an agitated layer 11.

When a predetermined depth is reached while drilling, the stirring pipe device 1 is rotated forward or reverse, and raised at a predetermined speed as shown by the white arrow in Figs. 1 and 4. A predetermined solidified powder such as cement is fed into the feed path 3 of the pipe 2 through gas transport using air.

Then, the fed powder is ejected together with air from the ejection nozzles 5, 5... into the stirring layer 11, and mixed with the stirring layer 11 by the stirring blades 4. The stirring blades 4 act to stir in the circumferential direction. As shown in FIG. 2, separate stirring blades 7 and 7' rotate together with the stirring blade 4 above the stirring blade 4. In order to move the stirring layer 11 inwardly and outwardly in the latter, a pipe device is installed. 1, the stirring and mixing of the powder and the stirring layer 11 becomes three-dimensional.
It will definitely be done.

On the other hand, among the powder and air ejected from the ejection nozzle 5, the air is separated by inertia and rises through the gap created by the three-dimensional stirring process, and rises through the back gap formed by the unexpanded portion 9 at the bottom of the fins 8, 8. , and an exhaust path gap 17 formed between the fins 8, 8 and the stirring layer 11.
The powder rises from the air, is diffused and depressurized in the vacuum box 12, settles and removes the powder, and is discharged into the atmosphere through the duct 18.

Of course, in the above-described process, the pipe 2 is extended, shortened, and removed as appropriate by the joint mechanism together with the fins 8, 8.

In this way, column-shaped improved areas 19 in which the powder is completely mixed are formed in the ground 10, and the powder absorbs moisture in the ground and solidifies over time.

<Other Embodiments> Accordingly, in the embodiment shown in FIGS. 4 and 5, the lower portions of the fins 8, 8 integrally provided on the side of the pipe 2 are separated from the side surface of the pipe 2 in an unexpanded state, and the stirring blades 4 is integrally fixed to the tip of the stirrer blade 4, and is integrally fixed to the tip of the stirrer blade 4 to form a stirring blade 7″ separate from the stirring blade 4,
Further, as shown in FIG. 5, the planar shape of the agitation layer 11 is twisted so that it can move inward and outward in a plane, as in the previous embodiment.

Due to this shape, the powder and the stirring layer 11 are three-dimensionally stirred and mixed uniformly, but a separate unspreading stirring blade 7'' is added to the stirring layer in the process of rotating and raising the pipe 2. In order to form an umbrella-shaped gap in the stirring blade 11, the air of the transport gas released and separated within the stirring blade 4 communicates with the exhaust path 17 formed by the fins 8, 8 using the gap as an exhaust path. It is smoothly discharged into the vacuum box 12 without any stagnation.

Also, during this time, the contained dust is effectively removed from the stirring layer 11 by centrifugal action.

The embodiment shown in FIG. 6 is an embodiment in which separate stirring blades 7, 7' of the embodiment shown in FIG. 1 are provided in the embodiment shown in FIG. Not only can mixing be performed, but also a continuous exhaust path for the separated gas can be formed.

Note that the embodiments of the invention of this application are of course not limited to the above-mentioned embodiments. For example, as shown in FIG. 8, it is possible to have three or more fins 8, and As shown in FIG. 9, various embodiments can be adopted, such as the pipe may be a square pipe 2' and the protruding portion may be located on the ridge line 8'.

<Effects of the Invention> As described above, according to the invention of this application, in a pipe device for stirring and mixing powder such as cement into soft ground, a protrusion for forming an exhaust path for powder transport gas is provided on the side of the pipe. By providing a separate stirring blade on the upper surface of the stirring blade that has a jet nozzle at the tip of the pipe and extends laterally, the stirring blade basically stirs the ground in the direction of rotation. In addition to this, the separate stirring blades provide further stirring action in both the inside and outside directions, so the powder jetted out from the jet nozzle can be reliably and uniformly mixed into the ground, improving the results. An excellent effect can be achieved in that the area can be formed as designed.

In addition, the separate stirring blade stirs the ground prior to powder injection, so it stirs the ground for a short time.
The exhaust gas can be quickly communicated with the exhaust passage formed by the protrusion, and as a result, the transported gas is smoothly discharged to the ground without stagnation in the ground, which not only creates voids in the ground. There are no disadvantages such as intermittent blowing up, and the powder can be smoothly supplied by gas transport.

Furthermore, since the separate stirring blades and the protrusions are connected together, the transport gas can be discharged from the ground to the ground more smoothly and continuously, and the strength of the stirring blades is also improved. It also has the effect of increasing improvement efficiency by reinforcing the ground, making it possible to apply a correspondingly large amount of torque, and allowing the use of large-scale equipment for ground improvement.

[Brief explanation of the drawing]

The drawings are explanatory diagrams of embodiments of the invention of this application, and FIG. 1 is an overall schematic partial side sectional view of one embodiment;
Figure 2 is a cross-sectional view, Figure 3 is Figures 1 and 4 A-
A sectional view, FIG. 4 is a partial side sectional view of another embodiment equivalent to FIG. 1, FIG. 5 is a V-V sectional view of the same, FIG. 6 is a partial perspective view of another embodiment, and FIG. 8 and 9 are cross-sectional views of a pipe of another embodiment. 10...Ground, 2,2'...Hollow pipe, 5...
...Blowout nozzle, 4...Stirring blade, 1,1',1''...
Injection stirring pipe device, 8, 8'... protrusion, 7,
7', 7''...Another stirring blade.

Claims (1)

[Claims] 1. In an injection stirring pipe device in which a stirring blade having a powder jetting nozzle is provided at the tip of a hollow pipe inserted into improved ground, a powder transporting gas is provided on the outer surface of the hollow pipe. An injection stirring pipe device characterized in that a strip for forming an exhaust passage is provided, and another stirring blade is integrally fixed on the upper surface of the stirring blade. 2. In an injection stirring pipe device in which a stirring blade having a powder jetting nozzle is provided at the tip of a hollow pipe inserted into the improved ground, a pipe for forming an exhaust path for powder transport gas is provided on the outer surface of the hollow pipe. A protrusion is provided, and a separate stirring blade fixed to the upper surface of the stirring blade is formed integrally and continuously with the protrusion forming the exhaust passage. Injection stirring pipe device.