JPS5947094B2 - Soft ground improvement soil pillar creation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a casing rod and a rotating rod to supply a hardening agent, a ground improvement hardening agent containing these as main components, and other stabilizing materials into the ground, while efficiently, safely and reliably treating soft ground. This invention relates to a soft ground improvement device that creates improved soil columns inside.

Conventionally, to improve this type of soft ground, a hollow casing rod with a stirring blade at the bottom end is rotated to settle to a predetermined depth, and when the casing rod is pulled up, hardening agent is dropped into the casing rod. At the same time, there are some methods in which the casing rod is pulled upward while mixing with the soil using a rotating stirring blade, but with the method using the casing rod, it is possible to supply a sufficient amount of hardening agent. Since the casing rod is pulled up while mixing the curing agent and soil, there may be places where the mixing is insufficient depending on the speed at which the casing rod is pulled up, and if the casing rod is pulled out slowly, the construction will take a lot of time.
It requires a skilled person and has the disadvantage that there is a lot of variation in hardness after construction.

In addition, in recent years, stirring blades have been integrated into the lower end of the hollow rod.
There are various types of rods that can be used for both injection and stirring, in which the hardening agent is pumped inside and a hollow rod is rotated and stirred while giving an upward motion to mix the hardening agent and soil.

However, in this case, the supply amount of the curing agent is not sufficient, and since the curing agent is forced out as the rod rotates, it is impossible to adjust the rotation and discharge amount, and mixing is also insufficient.
Since the entire mechanism is complex, failures and damage often occur.

This invention has improved the above-mentioned problems, and its main components are a rotatable casing rod containing a hardening agent that is suspended from a suspension device, and a rotation drive mechanism provided at the upper end. In a system in which rotating rods are constructed separately and are raised and lowered into the ground at the same time to create the ground, inside the casing rod there is a vertical rod extending from the tip of the rotating casing rod. The casing rod is provided with an insertion part for injecting the hardening agent upwardly, a discharge part for pouring out the hardening agent at the lower part, and compressed air is provided at a predetermined position of the casing rod. An air pipe communicating with the supply pump is installed, and a plurality of stirring blades which are several times longer than the diameter of the casing rod are installed below the rotating rod, and the stirring blades are horizontal to the rotating rod. Or a soft ground improvement and creation device characterized by being installed vertically and movably.

Therefore, according to the present invention, the casing rod and the hollow rod are each manufactured separately and their operation can be adjusted, so that the amount of pumping of the curing agent, the number of revolutions of the hollow rod, etc. can be appropriately selected during construction.

In addition, stirring and mixing work depending on the ground can be performed quickly and efficiently.

Since the twisted casing rod only pours out and pumps out the hardening agent while rotating, the hardening agent is supplied reliably and is evenly mixed with the soft soil, eliminating variations in hardness. There is.

Further, the overall structure can be simplified and miniaturized, and the drive mechanism can be used for both the casing rod and the rotating rod, which is very convenient and economical.

Next, one embodiment of the present invention will be described with reference to the drawings. The one shown in FIG. It consists of a rotating rod 3 equipped with a mechanism 2 and a movability expanding device 4 mounted below the rotating rod 3.

A rotating rod 3 is provided inside the casing rod 1.
is installed so as to extend from the tip of the casing rod 1.

The enlarging device 4 has one end attached to a fixed portion 5 below the rotating rod 3.
With this, a plurality of stirring blades 6, 6, which are several times longer than the diameter of the casing rod 1 are attached, and the stirring blades 6゜6 are
The telescopic arm rods 8, 8 are fixed to the rotating rod 3 using the connecting parts 7, 7.

The telescoping arm rods 8, 8 are used to open and close the stirring blades 6, 6 horizontally or vertically as shown in Figs. 2 and 3 using hydraulic jacks or other telescoping means, thereby enlarging or contracting the enlarging device 4. be.

Reference numeral 9 is an insertion portion provided at the upper part of the casing rod 1 for injecting the curing agent 14, and reference numeral 10 is an air pipe communicating with compressed air supply pumps (not shown) provided on both sides of the casing rod 10.

Reference numeral 11 denotes a discharge part provided at the lower part of the casing rod 1 to send out the hardening agent 14, 12 indicates a vibrator installed below the rotating rod as necessary, 13 indicates a soft ground, and 15 indicates a well-developed ground. It shows a pillar of earth.

Next, this invention has the above-mentioned configuration, and to explain how to use it now, firstly, the rotatable casing rod 1 suspended from a crane etc. and the rotary rod 3 are both connected to the soft ground.
3 and located at the bottom of the rotating rod 3.
, 6, . . . can be maintained in a vertical state when descending, but are opened and fixed in a horizontal state when executed during descent.

Further, the rotating rod 3 is capable of rotating at all times, and rotates together with the casing rod 1 while descending to a required submerged position.

After penetrating the casing rod 1 and rotating rod 3 to a predetermined depth as shown in FIG.

At the same time, the casing rod 1 also rotates, and the hardening agent 14 such as grout inside is forced out from the discharge part 11 provided below the casing rod 1, and the soil of the soft ground 13 and the hardening agent 14 are sufficiently stirred and mixed. As shown in Figure C, the operation is continued while ascending in sequence, and the casing rod 1 and rotating rod 3 are pulled up to create a large-diameter improved soil pillar 15 in the soft ground 13.

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

Incidentally, depending on the geology, it is natural to repeat the above-mentioned construction operation not only when ascending but also when descending.

Since this invention is constructed as described above, the casing rod and the rotating rod are each configured independently, so the amount of hardening agent can be increased or decreased and the rotation speed of the rotating rod can be adjusted sequentially depending on the condition of the soft ground. It has an excellent effect, and the lifting speed can be determined by appropriately selecting the amount of hardening agent pumped and the rotation of the rotating rod, so the hardness of the ground can be evened out, and there is no need for skilled workers. be.

In addition, the structure is not complicated and large, nor is it easily damaged, unlike the conventional method in which the injection and stirring devices are integrated into the casing rod and the rotating rod. It has an excellent property of eliminating the possibility of insufficient mixing due to drag speed.

Furthermore, the casing rod and the rotary rod can be rotated simultaneously by one rotary drive mechanism, and in the event of a failure, they can be repaired separately, which is very convenient.

In addition, since the casing rod consists of only an insertion part for the hardening agent and a discharge part for pouring out the hardening agent at the bottom, the structure is simple and can operate efficiently, and the role of the casing rod can be fully fulfilled. effective.

Furthermore, since the rotating rod has a stirring blade attached below the lower end of the casing rod, rotation is easy and reliable, and the required rotation speed can be freely selected.The simple structure also allows for easy rotation of the drive mechanism. It has the practical effect of being able to be made as compact as possible.

[Brief explanation of drawings]

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. A, mouth, and Ha are construction Jl.
[This is an explanatory diagram showing the introduction. 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 hardening agent, and 15 is a soil pillar.

Claims (1)

[Claims] 1 A rotatable casing rod that is suspended from a suspension device and a rotating rod that is rotated by a rotational drive mechanism provided at the upper end are each configured separately, and these are simultaneously raised and lowered into the ground to insert soil pillars into the ground. In soft ground improvement equipment that creates
Inside the casing rod, a rotary rod is vertically installed extending from the tip of the casing rod, and the casing rod is provided with an insertion part for injecting a hardening agent upwardly, and a lower part for pouring out the hardening agent. forming a discharge section to
Further, an air pipe communicating with a compressed air supply pump is installed at a predetermined position of the casing rod, and a plurality of stirring blades which are several times longer than the length of the casing rod are installed below the rotating rod, and the stirring blades are installed at a predetermined position. A soil pillar creation device for improving soft ground, characterized in that the blades are movably installed horizontally or vertically with respect to the rotating rod.