JPS6220328B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention is for the construction of stir-mixed construction piles in soft ground for creating large-diameter cylindrical construction piles in the ground by injecting and stirring stabilizing materials into various types of soft ground. METHODS AND APPARATUS.

In recent years, various methods and devices for improving and preparing the ground by injecting and mixing stabilizing materials into soft ground such as mudstone and humic soil layers have become available.

However, these methods have the disadvantage that the stirring area is narrow and small, the mixing consolidation is not uniform, and an average hardening resistance cannot be obtained.In addition, they can only be constructed with hollow piles, and they cannot be used as soil stabilizing materials. The hardened pile does not have a large diameter because the jet is not ejected in a powerfully consolidated manner.
There are disadvantages in that stirring and mixing with soft ground is not efficient, and construction cannot be done quickly.

Furthermore, the conventional construction methods and equipment presently pose a serious pollution problem due to the noise, vibration and impact sounds generated during the construction work.

This invention is aimed at solving the above-mentioned problems. A jet agitator is installed below the hollow rod, and when the rod descends into soft ground, the stabilizer is powerfully injected from the high-pressure injection arm of the jet agitator. A large-diameter primary hardened pile is formed by injection, and then a second hardened pile is formed using soil stabilizing material from the low-pressure injection injection hole using low pressure inside the primary hardened pile as it rises. The purpose is to create hardened piles with an average double layer inside and outside. Therefore, according to the present invention, it is possible to easily create a uniformly hardened construction pile with a large diameter equivalent to that of a large equipment using a small device in soft ground, and it is possible to easily create a uniformly hardened construction pile with a large diameter equivalent to that of a large equipment, and to create a uniformly hardened construction pile with the inside and outside of the construction pile compacted. By making the soil hardened and switching from high-pressure injection to low-pressure injection, we achieved practical effects such as minimizing noise and vibration noise.

Next, an embodiment of the present invention will be described with reference to the drawings. A hollow rod 1 having various diameters of various sizes is constructed, and a drive mechanism A equipped with various devices is installed at the upper end. A jet agitator 2 is connected to the hollow rod 1 at its lower end. This injection agitator 2 has a connecting part 3 connected to the hollow rod 1 at the upper end, and has a plurality of high pressure injection injection arms 4, 4 at predetermined intervals.
is formed to protrude in the lateral direction. These high-pressure injection arms 4, 4 are provided with a through hole 11 inside,
High pressure injection holes 5, 5 are formed at the tip. Next, the high pressure injection injection arms 4, 4 of the injection agitator 2
Rotary blades 6, 6 for drilling and mixing are mounted on the lower outer periphery of the rotor, and one or more low-pressure injection holes 7 are formed at predetermined positions on the outer periphery. Further, the injection agitator 2 has cutting blades 10, 10 of various shapes protruding from the tips of the lower rotary blades 6, 6. Reference numeral 8 denotes a primary hardened pile created by mixing and stirring the hollow rod 1 during the descending process, and 9 in the figure represents the internal hollow of the primary hardened pile 8, which is also created during the ascending process. This figure shows the secondary hardened piles used to create the section.

This invention has the above-mentioned configuration, and its usage will now be explained based on FIGS. 2 and 3. The injection agitator 2 is attached to the lower end of the hollow rod 1 and the rod is placed on soft ground B. A rotary hole is drilled while discharging water etc. from the tip of the injection agitator 2 as necessary, and the water is pumped under high pressure from the high pressure injection holes 5, 5 at the tips of the high pressure injection arms 4, 4 provided on the injection agitator 2. The soil stabilizing material is ejected and mixed with the soft ground, and enlarged large-diameter construction piles are sequentially formed while descending to a predetermined depth, thereby improving and completing the primary hardening pile 8. Next, as shown in FIG. 3, the soil stabilizer is gradually pulled out from a predetermined depth and rotated upward, and the soil stabilizing material is pumped through the low-pressure injection hole 7 provided on the outer periphery of the injection agitator 2 using the pressure switched to the low-pressure pump. The mixture is evenly injected and mixed into the hollow interior of the primary hardening pile 8 by low-pressure injection, and a large diameter improved ground is created while creating the secondary hardening pile 9.

What has been explained above is a standard ground improvement method for soft ground, but under special conditions, it is natural to use a large amount of stabilizer, or to inject, stir, mix, etc. Work may be repeated.

As described above, this invention is equipped with an injection agitator equipped with a high pressure injection arm and a low pressure injection hole at the lower end of the hollow rod. The operation allows easy formation of very large-diameter construction piles, which has the excellent effect of efficiently improving soft ground, and the high-pressure injection arm that operates when descending, expands due to high-pressure injection. This has the effect of creating uniform primary hardened piles by jetting and stirring the stabilizer over a wide range. In addition, the low-pressure injection hole, which is activated only when rising, reliably fills the space inside the center of the primary hardened pile by stirring and mixing, creating the effect of strongly integrating the two. Since the areas where hardened piles are not consolidated uniformly are constructed using secondary hardened piles, there is also the effect that constructed piles with high strength can be obtained.

Furthermore, according to this invention, a high pressure pump is used to form a large-diameter construction pile when descending, or a low pressure pump is used as appropriate during construction when ascending, thereby reliably preventing noise and vibration noise. However, it has practical characteristics that can sufficiently solve the pollution problem.

In addition, in the production apparatus of the present invention, the injection agitator is extremely compact as a whole, lightweight, and extremely effective for transportation, etc.; Since the high-pressure injection arm is fixed and protrudes laterally, it is easy to attach and detach the hollow rod, and it has the excellent effect of greatly expanding the area of construction to form large-diameter construction piles, and it has the advantage of being able to form large-diameter construction piles. Unlike a stirring arm, there is no trouble in opening and closing operations, and there is no malfunction caused by opening and closing. Furthermore,
The injection agitator has a rotor blade, an injection hole, and several drilling blades installed in the rotor blade, each of which is integrally constructed, making the whole structure tough and practical, without worrying about being easily damaged. There is an effect.

Note that this invention is not limited to the embodiments shown in the drawings, and it goes without saying that the design can be changed within the scope of the rights.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention.
The figure is a front view of the injection agitator of this invention, and the second figure is
Figure 3 is a partially cut-out side view showing the construction sequence of descending underground, Figure 3 is a partially cut-out side view showing the construction sequence of raising the earth, and Figure 4 is a side view of the high-pressure injection arm. FIG. 1 is a hollow rod, 2 is an injection agitator, 4 is a high pressure injection injection arm, 5
is a high-pressure injection injection hole, 6 is a rotor, 7 is a low-pressure injection injection hole, 8 is a primary hardening pile, 9 is a secondary hardening pile, 1
0 is the excavation blade, and A is the drive mechanism.

Claims (1)

[Scope of Claims] 1. With the injection agitator 2 attached to the lower end of the hollow rod 1, the hollow rod 1 is lowered by drilling a hole in the soft ground using rotary blades 6, 6, and at the same time the injection agitator 2 is injected under high pressure. The soil stabilizing material pumped under high pressure is ejected from the high-pressure injection injection hole 5 provided in the injection arm 4, and while stirring and mixing the soft ground, enlarged and large-diameter construction piles are successively descended to a predetermined depth to form primary hardened piles. 8 is completed, and then the soil stabilizing material is injected and mixed from the low-pressure injection injection hole 7 provided in the injection agitator 2 at the same time as the first hardened pile 8 is pulled out from a predetermined depth and rotated upward. A method for constructing a stirred mixed construction pile in soft ground, characterized by forming a hardened pile 9 to create a double inner and outer cylindrical hardened pile. 2. A jet agitator 2 is connected to the hollow rod 1, which is equipped with a drive mechanism on the upper part, at the lower end, and the jet agitator 2 is provided with a connecting part 3 connected to the hollow rod 1 at the upper end, and is connected at a predetermined interval. A high-pressure injection injection arm 4 is fixedly protruded in the lateral direction, and a through hole 11 is provided inside the high-pressure injection injection arm 4, and a high-pressure injection injection hole 5 is formed in the injection agitator 2. It is characterized in that a mixing rotor 6 is installed, at least one or more low-pressure injection holes 7 are formed at a predetermined position on the outer periphery, and excavation blades 10 of various shapes are formed protruding from the rotor 6. A device for creating piles using agitation mixture in soft ground.