JPH03208909A - Double pipe boring and kneading machine and land improvement using same - Google Patents

Abstract

PURPOSE:To make it possible to stir and knead a hard subsoil and soft subsoil uniformly in succession by boring the subsoil while jetting solidifying liquid from the tips of double pipe shafts by pressure, and mixing the solidifying liquid and sand by stirring and mixing means. CONSTITUTION:Stirring and mixing means 3... are provided to the outsides of external pipe shafts 2... rotating at a high speed of double pipe shafts 1... rotating separately, and boring bits 5... and liquid discharging holes 6... are provided to the tips of internal shafts 4 and 4 rotating at high torque. In addition, the double pipe shafts 1... are capable of controlling rotation in the opposite direction every certain time to form a double boring and kneading machine. The subsoil is bored while jetting solidifying liquid 8... such as cement milk, etc. by pressure by making use of the double pipe boring and mixing machine, and the solidifying liquid 8... are poured into the subsoil. After that, the solidifying liquid 8... is mixed with sand by the stirring and mixing means 3, and the double pipe shafts 1... are rotated in the opposite direction every certain time during the mixture.

Description

Detailed Description of the Invention 1. Field of Industrial Application 1. The present invention uses a double-pipe drilling kneading machine and a double-pipe drilling kneading machine for excavating the ground and mixing excavated soil and liquid. This invention relates to a method for improving soil that has been damaged.

[Prior art 1] When improving the ground that has conventionally been composed of soft soil (hereinafter referred to as soft ground), the lower layer of the compacted hard earth and sand or the upper layer of bedrock (hereinafter referred to as hard ground) If similar improvements are not made to some parts of the ground, landslides will often occur at the boundary between soft and hard ground if the strata are diagonally structured. Generally, when improving soft ground, the soil and consolidation liquid may be mixed from the tip of the rotating shaft using injection liquid pressure.

In this case, only the injection pressure is used, resulting in insufficient stirring and mixing.

There are also machines that drill holes while discharging the consolidation liquid from the tip of the rotating shaft, and mix the soil and consolidation liquid with stirring and kneading blades attached to the rotating shaft. If the shaft is not rotated at high speed, the consolidation liquid and soil will not be sufficiently mixed. However, if the rotary shaft is rotated too fast, the drilling capacity will be low, and at the same time, parts of the upper layer of the hard ground, etc. This makes it impossible to drill holes. On the other hand, when the drilling capacity is increased, the rotation becomes low, resulting in insufficient stirring and mixing.

For this reason, a drilling machine disclosed in Japanese Patent Publication No. 58-50217 has been known as a hole-drilling machine that can perform sufficient stirring and mixing without reducing the drilling ability. This special public service in 1988
What is shown in Publication No. 50217 is a double tube shaft that rotates separately from each other, the outer tube shaft rotates at high speed and has a stirring section only on the lower outer surface, and the inner shaft rotates at low speed and has a stirring section at the tip. This is a double-pipe drilled kneading machine that has a pipe F and has holes for discharging liquid.

Problem 1 to be Solved by the Invention By the way, the conventional double-pipe drilling kneading machine rotates in the same direction from beginning to end during stirring and mixing of the excavated soil and the consolidation liquid. There was still not enough crosstalk.

The present invention was devised in view of the problems of the conventional examples described above, and its purpose is to achieve sufficient stirring and mixing when improving soft and hard ground as a single unit, and to drill holes. To provide a method for improving the ground using a double-pipe drilling machine and a double-pipe drilling mixed rock that can improve the ground without reducing capacity and prevent fault slipping.

[Means for Solving the Problems] In order to solve the above-mentioned seven conventional problems and achieve the object of the present invention, the double-tube drilling kneading machine of the present invention has two double-tube holes that rotate independently of each other. In the shaft 1, the outer tube shaft 2 rotates at high speed and is provided with a stirrer and kneader Pi3 on the outer surface, and the inner shaft 4 rotates at high torque and has a drilling bit 5 at the tip and a hole 6 for discharging liquid. , and a rotation direction conversion control section 7 that controls the double tube shaft 1 to rotate in the opposite direction at regular intervals.

Here, a plurality of double tube shafts 1 may be arranged.

Furthermore, when a plurality of double tube shafts 1 are arranged in this way, the U rotation loci drawn by the stirring and mixing means 3 of adjacent double tube shafts 1 are arranged so that some of them overlap each other in plan view. May be set.

In addition, the method for improving the ground using the double tube drilling and mixing machine of the present invention is such that the double tube shaft 1 rotates separately, the outer tube shaft 2 rotates at high speed, and the stirring mixing means 3 is provided on the outer surface. The inner shaft 4 is rotated by a quotient torque and has a drilling bit 5 at the tip and a hole 6 for discharging liquid, and the double tube shaft 1 is controlled to rotate in the opposite direction at regular intervals. A rotational direction conversion control unit 7 is provided to form a double-pipe drilling kneading machine, and the double-pipe drilling kneading machine drills holes in the ground while pressurizing cement milk or other solidifying liquid 8. , Cement milk or other consolidation liquid 8 is injected into the ground, and the cement milk or other consolidation liquid 8 and earth and sand are mixed by the stirring/mixing means 3 of the outer tube shaft 2, and during this mixing, double This system is characterized by rotating the tube shaft 1 in the opposite direction at regular intervals.

1 Effect] Therefore, the outer tube shaft 2 rotates at high speed and is provided with stirring and mixing means 3 on the outer surface, and the inner shaft 4 rotates at high torque and has a drilling bit 5 at the tip and a hole for discharging liquid. 6, the inner shaft 4 rotates with a quotient torque and can drill holes not only in soft ground but also in hard ground, and the outer shaft 2 rotates at high speed to separate the consolidation A8 and excavated soil. In addition, for this stirring and cross-talk, a rotation direction conversion control section 7 is provided to control the double tube shaft 1 to rotate in the opposite direction at regular intervals. Therefore, after a certain period of time has elapsed, stirring and kneading is automatically performed in the opposite direction.

1 Example] The present invention will now be described in detail based on embodiments shown in the accompanying drawings.

FIGS. 1 to 3 show an example of a double-pipe drilling kneading machine according to the present invention. An outer tube shaft 2 is fitted onto the outer periphery of the inner shaft 4 to form a double tube shaft 1, in which the inner shaft 4 and the outer tube shaft 2
and rotate independently from each other. Outer tube shaft 2
The stirring and kneading means 3 is provided partially along the entire length of the outer surface in the upper direction or in the upper and lower directions. A drilling bit 5 is provided at the tip of the inner shaft 4. The rotational trajectories of the stirring and kneading means 3 that are adjacent in the horizontal direction are set so that some of them overlap each other in plan view. A hole 6 for discharging liquid is provided on the side of the inner shaft 4 or at the lower part of the outer tube shaft 2. A double tube drilling and kneading machine is constructed by arranging a plurality of double tube shafts 1 having the above structure in parallel. The upper part of each double-tube shaft 1 is attached to a multi-shaft 1filO, and the rotation of a drive device 23 such as a prime mover is transmitted to the multi-shaft W device 10, and the multi-shaft The outer tube shaft 2 of the heavy tube shaft 1 is rotated at high speed, and the inner shaft 4 is rotated at high torque.

To further explain the double tube shaft 1, the F portion of the inner shaft 4 has a large diameter portion 11 having the same diameter as the outer tube shaft 2, and this large diameter portion 11 protrudes downward from the outer tube shaft 2. A drilling bit 5 is provided in the large diameter portion 11.

The inner shaft 4 is provided with an engaging protrusion 12, and the retaining protrusion 12 is rotatably engaged with a groove 13 provided on the inner peripheral surface of the outer tube shaft 2. In the figure, reference numeral 14 denotes a connection that connects the outer tube shafts 2 or the inner shafts 4 together, and prevents the double tube shafts 1 from expanding or coming together. It is rotatably loosely fitted onto the tube shaft 2 or inner shaft 4. In the figure, 16 is a crawler crane, and 17 is a steady rest device installed at the bottom of the rail 18 of the crawler crane 16. Inside this steady rest device 17, a plurality of double tube shafts 1 are moved up and down. It has become. In the double tube drilling kneading machine having the above configuration, the present invention includes a rotation direction conversion control section that controls the double tube shafts 1 that rotate separately from each other to rotate in opposite directions after a certain period of time has elapsed. 7 is provided.

FIG. 4 shows a drive device 23 by the rotation direction conversion control section 7.
It is a block diagram showing the configuration of a means for controlling the rotation direction of the rotation direction, and includes an operation section 20 consisting of operation switches such as a rotation start switch, a rotation end switch, an emergency stop switch, and a timer setting switch, and a timer unit for setting an automatic reversal time. 21, a rotation control section 22 that outputs a rotation direction control signal (■) based on the output of the operating section 20 and the output of the timer section 21, and a relay that switches the rotation direction of the drive device 123 based on the rotation direction control signal (■). Rotation direction switching section 2
4, the direction of rotation of the drive device 23 is switched at fixed intervals set by the timer part 21, and the direction of rotation of each double tube shaft 1 is changed and rotated. ing. In the above block diagram, the timer part 2
1, a rotation control section 22, and a rotation direction switching section 24 to form the rotation direction conversion control section 7. In this embodiment, in the same double tube shaft 1, the outer tube shaft 2' and the inner tube shaft 2' axis 4
When the drive device 23 is automatically rotated in the opposite direction after a certain period of time, the outer tube shaft 2 and the inner shaft 4 rotate in the opposite direction together. . Of course, in the present invention, in the same double tube shaft 1, the outer tube shaft 2 and the inner shaft 4 are set to rotate in opposite directions, and the drive device 23 is automatically rotated after a certain period of time. By rotating the outer tube shaft 2 and the inner shaft 4 in opposite directions, the outer tube shaft 2 and the inner shaft 4 may be rotated in the opposite directions.

The double tube drilling kneading machine with the above configuration has a steady rest! The inner shaft 4 is rotated with high torque and the outer tube shaft 2 is rotated at a high speed while lowering the plurality of double tube shafts 1 which are vertically movably inserted into the position 17. The inner shaft 4 is rotated at high torque and the ground is drilled with the drilling bit 5 while spouting cement milk or other consolidation liquid 8 from the hole 6.The excavated earth and sand and the consolidation liquid 8 are Outer tube shaft 2 rotating at high speed
The stirring and kneading means 3 stir and knead at high speed. In this case, the solidifying liquid 8 spouted at the tip breaks down the ground on the side of the drilling bit 5.

Here, since the inner shaft 4 is rotated with high torque, the drilling capacity is increased, and holes can be reliably drilled not only in soft ground but also in hard ground. By rotating the outer tube shaft 2 at high speed, the excavated earth and sand and the consolidation liquid are mixed and stirred at high speed by the stirring and kneading means 3. By the way, in the double pipe drilling of the present invention, a rotation direction conversion control unit 7 is provided to control the double pipe shafts 1, which rotate separately from each other, to rotate in opposite directions after a certain period of time has elapsed. Therefore, the double tube shafts 1, which rotate separately from each other, are rotated in opposite directions every predetermined time period while cement milk or other solidifying liquid 8 is being mixed with earth and sand. In this way, by rotating the double tube shaft 1 in the opposite direction every predetermined period of time by the rotational direction conversion control section 7, the hard ground and the soft ground can be continuously and uniformly stirred and kneaded. As described above, soil improvement is carried out by forming walls in the ground that have a cross-sectional shape that is approximately recessed, but it is also possible to form retaining walls by doing this in succession. . 1 In the above embodiment, the upper part of each double tube shaft 1 is attached to the multi-shaft device 10, and the multi-shaft device 10 rotates the outer tube shaft 2 of the double tube shaft 1 at high speed through the variable speed mechanism, and the inner shaft 4 is rotated with high torque, the outer tube shaft 2 is still rotated at high speed while the inner tube shaft 4 is still rotated by using a speed change mechanism using a separate drive device 23 for each of the double tube shafts. FIG. 5 is a block diagram showing the configuration of the rotation driving means in this embodiment, which may be rotated by torque. This embodiment shows an example in which three double-pipe shafts 1 are arranged in parallel, and the operating section 2
Based on the 0 output and the output of the timer section 21, the rotation control section 22 outputs rotation direction control signals Va, Vb, and Vc, and each rotation direction switching section 24aw24b is switched based on the rotation direction control signals Va, Vb, and yVc. , the rotation direction of each drive 971123 is switched.

In the above embodiment, a plurality of double pipe shafts 1 were arranged in parallel to form a double pipe drilling and kneading machine, but as shown in FIG.
A double-tube drilling and kneading machine may be constructed using the double-tube shaft 1.

FIG. 17 shows another embodiment of the present invention.

In this embodiment, 'C' is provided with stirring and kneading means 3' also at the lower part of the inner shaft 4. In this way, by providing the stirring and kneading means 3' on the inner shaft 4, when stirring and kneading the excavated earth and sand and the consolidation liquid, the stirring and kneading means Fi3 provided on the outer tube shaft 2 rotating at high speed can be used. Stirring and kneading means 3 provided on the inner shaft 4 which rotates with Hata torque (usually rotates at low speed for high torque rotation)
′, and more efficient stirring and kneading can be performed. In this case, more efficient stirring can be achieved by setting the stirring and kneading means 3 that rotates at high speed and the stirring and kneading means 3' that rotates at low speed to rotate in opposite directions.

In addition, if a hole 6 for discharging liquid is provided at the 911 part of the outer tube shaft 2, and a hole 6 for discharging liquid is provided at the lower end of the inner shaft 4 and aS, it is possible to The liquid 8 makes it easy to drill holes in the ground, and the inner shaft 4 is equipped with stirring and kneading means 3'.
is provided, the fi welding liquid 8 can be discharged and stirred into the excavated soil being stirred by the stirring hand Fi 3',
Further, the consolidation liquid 8 can be directly discharged from the hole 6 provided in the outer tube shaft 2 to the excavated soil being stirred by the stirring and kneading means 3 of the outer tube shaft 2 to mix and mix the excavated soil. Stirring and mixing with the solidification liquid 8 can be performed more efficiently. When discharging from the hole 6 of the inner shaft 4, the solidifying liquid 8 is supplied through the pipe-shaped inner shaft and discharged from the hole 6. In order to discharge the solidifying liquid 8 from the hole 6, the solidifying liquid 8 is supplied into the outer tube shaft 2 and then discharged from the hole 6.

Note that various types of stirring and kneading means 3 in the present invention can be considered, such as blades and screws, but there is no particular limitation as long as it has a stirring and kneading effect.

In each of the above embodiments, the outer tube shaft 2 and the inner tube shaft 4 of the double tube shaft 1 are
Although the embodiment has been described in which the same drive device 23 drives the gear via the transmission, in each of the above embodiments, the outer tube shaft 2 and the inner shaft 4 of the double tube shaft 1 are separated from each other. The drive Wc positions 23a and 23b may be used to drive the Wc, respectively. In this case, as shown in FIG.
Based on the 0 output and the output of the timer section 21, the rotation control section 22 outputs the rotation direction control signals Vd and Ve of each drive device 23a*23b, and the rotation direction switching section of each rotation direction control signal Vd and Ve is output based on the rotation direction control signals Vd and Ve. By switching 24d and 24e, the rotation direction of each drive ikj [23a and 23b is switched.

[Effects of the invention] In the present invention, as described above, two parts rotate separately from each other.
In the heavy tube shaft, the outer tube shaft rotates at high speed and is provided with stirring and kneading means on the outer surface, and the inner shaft rotates at high torque and has a drilling bit at the tip and a hole for discharging liquid. Since a rotation direction conversion control unit is provided to control the tube shaft to rotate in the opposite direction at regular intervals, the inner shaft rotates with torque, making it possible to drill not only in soft ground but also in hard ground. Of course, by rotating at high speed, the consolidation liquid and the excavated soil can be stirred and kneaded well. Since it is equipped with a rotation direction conversion control section that controls rotation direction, stirring and kneading is automatically performed in the opposite direction after a certain period of time has passed, allowing hard and soft ground to be continuously and uniformly stirred and kneaded as one unit. This has the effect of allowing improvements to be made.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of an embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a plan view of the steady rest Wc placement part of the above, and Fig. 4 is a rotation direction change of the same as the above. A block diagram showing the configuration of a means for controlling the rotation direction of the drive device by the control unit,
Figure #55 is a block diagram showing the configuration of another embodiment of the means for controlling the rotational force direction of the drive device by the rotational direction conversion control section, and Figure 6 is a sectional view of another embodiment of the present invention. FIG. 7 is a partially cutaway front view showing still another embodiment of the present invention, and FIG.
The figure is a sectional view showing still another embodiment of the present invention, and FIG. 9 is a block diagram showing the configuration of means for controlling the direction of rotational force of the drive device by the rotational direction conversion control section of still another embodiment of the present invention. 1 is a double tube shaft, 2 is an outer tube shaft, 3 is a stirring and kneading means, 4 is an inner shaft, 5 is a drilling bit, 6 is a hole, 7 is a rotational direction conversion control unit, and 8 is a rigid It is a conjunctive fluid.

Claims (4)

[Claims] (1) In the dual tube shafts that rotate separately from each other, the outer tube shaft rotates at high speed and is equipped with stirring and kneading means on the outer surface, and the inner shaft rotates at high torque and has a drilling bit at the tip and liquid What is claimed is: 1. A double tube drilling kneading machine, characterized in that it is provided with a hole through which the double tube is discharged, and is provided with a rotation direction conversion control section that controls the double tube shaft to rotate in the opposite direction at regular intervals. (2) A double-pipe drilling and kneading machine characterized by arranging a plurality of double-pipe shafts according to claim 1. (3) The double tube according to claim 2, wherein parts of the rotation trajectories drawn by the stirring and kneading means of adjacent double tube shafts are set to partially overlap with each other in plan view. Drilling kneading machine. (4) In the dual tube shafts that rotate separately from each other, the outer tube shaft rotates at high speed and is provided with stirring and kneading means on the outer surface, and the inner shaft rotates at high torque and has a drilling bit at the tip and liquid A double tube drilling kneading machine is formed by providing a hole for discharging the double tube shaft and a rotation direction conversion control unit that controls the double tube shaft to rotate in the opposite direction at regular intervals. A hole is drilled into the ground while squirting cement milk or other solidifying liquid using a kneader, and cement milk or other solidifying liquid is injected into the ground, and the stirring and kneading means of the outer tube shaft is used to mix the cement milk or other solidifying liquid. A ground improvement method using a double-tube drilling and mixing machine, characterized in that the consolidation liquid and earth and sand are mixed, and during this mixing, the double-tube shaft is rotated in opposite directions at fixed time intervals. .