JPH07100933B2 - Double pipe drilling kneader and method for improving ground using double pipe drilling kneader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention uses a double pipe boring kneader and a double pipe boring kneader for excavating the ground and kneading the excavated soil and liquid. It is an invention relating to a method for improving a ground.

[Prior Art] When improving a soil (hereinafter referred to as "soft soil") that is conventionally composed of soft soil, an upper layer portion of the ground or rock bed (hereinafter referred to as "hard soil"), which is a solid ground at the bottom of the ground. In the case where the stratum is constructed diagonally with the same improvement over a part of the ground, a landslide phenomenon often occurs from the boundary between the soft ground and the hard ground. In general, when improving soft ground, the earth and sand and the congealing liquid may be mixed by jetting liquid pressure while mixing the earth and sand and the congealing liquid from the tip of the rotating shaft.
In this case, since only the injection pressure is used, stirring and mixing are insufficient.
In addition, there is one in which the congealing liquid is discharged from the tip of the rotary shaft, and the sand and sand and the congealing liquid are kneaded by a stirring and kneading blade attached to the rotary shaft. The kneading of the congealing liquid and the earth and sand is not sufficiently performed unless the rotation of the above is rotated at a high speed. However, when the rotating shaft is rotated at a high speed, the drilling capability is reduced and at the same time, part of the upper layer of the hard ground cannot be drilled. On the other hand, when the drilling capacity is increased, the rotation becomes low and the stirring and kneading becomes insufficient.

For this reason, the one disclosed in Japanese Patent Publication No. 58-50217 is conventionally known as a drilling excavator capable of sufficiently stirring and kneading and not lowering the drilling capability. According to the Japanese Patent Publication No. 58-50217, in a double tube shaft rotating independently of each other, the outer tube shaft rotates at a high speed, a stirring section is provided only on the lower outer surface, and the inner shaft rotates at a low speed. It is a double-pipe drilling and kneading machine which has none and has a bit at the tip thereof and is provided with a hole for discharging a liquid.

[Problems to be Solved by the Invention] By the way, since the conventional double pipe drilling and kneading machine rotates and agitates in the same direction throughout the agitation and kneading of the excavated soil and the consolidation liquid, the agitation and kneading is performed. Was still not enough.

The present invention is invented in view of the problems of the above-mentioned conventional example, the object is to improve the soft ground and hard ground as a unit, stirring and kneading can be sufficiently performed, and drilling A double pipe drilling and kneading machine that can improve the ground without reducing the ability and prevent fault slip and a method for improving the ground using the double pipe drilling and kneading machine.

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems and achieve the object of the present invention, the double-tube drilling and kneading machine of the present invention has a double-tube shaft 1 that rotates independently of each other. In the above, the outer tube shaft 2 is rotated at high speed, the outer surface is provided with the stirring and kneading means 3 and the hole 6 for discharging the liquid is provided, and the inner shaft 4 is rotated at high torque and the lower stirring and kneading means 3'is provided and the tip is provided. In addition to the hole forming bit 5, the hole 6 for discharging the liquid is provided, and the rotation direction conversion control unit 7 for controlling the double tube shaft 1 to rotate in the opposite direction at regular intervals is provided.

Here, a plurality of double tube shafts 1 may be arranged. Furthermore, when arranging a plurality of double pipe shafts 1 in this way, two adjacent pipe shafts 1
You may set so that some rotation locus | trajectories which the stirring kneading means 3 of the heavy pipe axis | shaft 1 may mutually overlap in planar view.

Further, in the method for improving the ground using the double pipe drilling and kneading machine of the present invention, in the double pipe shaft 1 rotating independently of each other, the outer pipe shaft 2 rotates at high speed and the outer surface is agitating and kneading means 3 And a hole 6 through which the liquid is discharged, the inner shaft 4 is rotated at a high torque, a lower stirring and kneading means 3'is provided, a drill bit 5 is provided at the tip, and a hole 6 through which the liquid is discharged is provided. A rotation direction conversion control unit 7 that controls the double pipe shaft 1 to rotate in the opposite direction at regular intervals is provided to form a double pipe drilling kneader, and the double pipe drilling kneader is used to cement. The ground is drilled while spraying milk or other hardening liquid 8, and cement milk or other hardening liquid 8 is injected into the ground to agitate the stirring and kneading means 3 of the outer tube shaft 2 and the inner shaft 4. Cement milk or other congealing liquid 8 and earth and sand are mixed by the kneading means 3 ', and during this mixing, The double tube shaft 1 is rotated in the reverse direction for each predetermined time Te is characterized in.

[Operation] Therefore, the outer tube shaft 2 is rotated at a high speed, the outer surface is provided with the stirring and kneading means 3 and the hole 6 for discharging the liquid is provided, and the inner shaft 4 is rotated at a high torque and the lower stirring and kneading means 3'is provided. Since the hole 6 is provided and the hole 6 is provided at the tip and the hole 6 for discharging the liquid is provided, the inner shaft 4 can be rotated by a high torque to drill not only soft ground but also hard ground.
Further, by rotating the outer tube shaft 2 at a high speed, it is possible to satisfactorily stir and knead the consolidation liquid 8 and the excavated soil, and the stirring and kneading means 3 of the outer tube shaft 2 which rotates at a high speed. The congealing liquid 8 can be directly discharged onto the excavated earth and sand that is stirred by stirring to mix, and the lower stirring and kneading means provided on the inner shaft 4 that rotates with high torque (usually low speed rotation for high torque rotation) The congealing liquid 8 can be directly discharged to the excavated soil stirred in 3 ′ to be agitated and mixed, so that the excavated soil and the congealing liquid 8 can be efficiently agitated and mixed, and the soft ground and the hard ground can be continuously connected. It is possible to effectively stir and mix, and at the time of stirring and kneading, since the rotation direction conversion control unit 7 that controls the double tube shaft 1 to rotate in the opposite direction at regular intervals is provided, After the lapse of time, stirring and kneading are automatically performed in the opposite direction, It has enabled improved integrally made uniformly stirred and kneaded continuously and soft ground with.

[Embodiment] The present invention will be described in detail below based on an embodiment shown in the accompanying drawings.

FIG. 1 to FIG. 3 show an example of the double pipe hole kneading machine according to the present invention. An outer pipe shaft 2 is externally fitted to the outer periphery of the inner shaft 4 to form a double pipe shaft 1, and the inner shaft 4 and the outer pipe shaft 2
And are designed to rotate independently of each other. Outer tube shaft 2
The agitating and kneading means 3 is partially provided in the entire length of the outer surface in the vertical direction or in the vertical direction. A hole 6 for discharging the liquid is provided on the side of the outer tube shaft 2. A drill bit 5 is provided at the tip of the inner shaft 4. It is set so that a part of the rotation loci drawn by the agitating and kneading means 3 adjacent to each other in the lateral direction partially overlap each other in a plan view. A hole 6 for discharging the liquid is provided in the side portion of the inner shaft 4 or the lower portion of the outer pipe shaft 2. A stirring and kneading means 3'is also provided below the inner shaft 4. A plurality of double pipe shafts 1 having the above structure are arranged in parallel to form a double pipe drilling and kneading machine. The upper part of each double pipe shaft 1 is attached to the multi-spindle device 10, and a drive device 23 such as a prime mover is provided.
Is transmitted to the multi-spindle device 10 so that the outer pipe shaft 2 of each double pipe shaft 1 is rotated at a high speed and the inner shaft 4 is rotated by a high torque through the transmission mechanism in the multi-spindle device 10 portion. There is. Explaining further about the double pipe shaft 1, the lower part of the inner shaft 4 has a large diameter portion 11 having the same diameter as the outer pipe shaft 2, and the large diameter portion 11 projects downward from the outer pipe shaft 2. The large diameter portion 11 is provided with a drill bit 5. The inner shaft 4 is provided with an engagement protrusion 12, and the engagement protrusion 12 is rotatably engaged with a groove 13 provided on the inner peripheral surface of the outer pipe shaft 2. Reference numeral 14 in the figure is a connecting tool for connecting the outer pipe shafts 2 with each other or the inner shafts 4 with each other to prevent the space between the double pipe shafts 1 from expanding or narrowing, and a bearing portion.
The outer pipe shaft 2 or the inner shaft 4 is rotatably fitted with the shaft 15. In the figure, 16 is a crawler crane and 17 is a crawler crane.
It is a steady rest installed at the bottom of 16 rails 18,
A plurality of double tube shafts 1 move up and down inside the steady rest 17. According to the present invention, in the double pipe drilling and kneading machine having the above-described configuration, the rotation direction conversion control unit that controls the double pipe shafts 1 that rotate separately after a predetermined time to rotate in opposite directions. 7 is provided.

FIG. 4 is a block diagram showing a configuration of means for controlling the rotation direction of the drive device 23 by the rotation direction conversion control unit 7, and operation switches such as a rotation start switch, a rotation end switch, an emergency stop switch, and a timer setting switch. Consisting of an operating unit 20 and a timer unit 21 for setting the automatic reversing time
And a rotation direction switching unit 22 that outputs a rotation direction control signal V based on the operation unit 20 output and a timer unit 21 output, and a rotation direction switching including a relay that switches the rotation direction of the drive device 23 based on the rotation direction control signal V. It is composed of a section 24, and the rotation direction of the drive device 23 is switched at regular intervals set by the timer section 21 so that the rotation direction of each double tube shaft 1 is converted and rotated. There is. Then, in the above block diagram, the timer unit 21, the rotation control unit 22,
The rotation direction switching unit 24 and the rotation direction switching unit 24 constitute the rotation direction conversion control unit 7. In this embodiment, in the same double pipe shaft 1, the outer pipe shaft 2 and the inner shaft 4 rotate in the same direction, and the drive device
When the rotation of 23 is automatically rotated in the opposite direction after a lapse of a certain time, the outer tube shaft 2 and the inner shaft 4 are aligned and rotated in the opposite direction. Of course, in the present invention, the same 2
In the heavy pipe shaft 1, the outer pipe shaft 2 and the inner shaft 4 are set so as to rotate in mutually opposite directions, and after the elapse of a certain period of time, the drive device 23 is automatically rotated in the opposite direction so that The tube shaft 2 and the inner shaft 4 may be rotated in the opposite directions.

The double-tube drilling and kneading machine having the above-described structure rotates the inner shaft 4 with a high torque while lowering the plurality of double-tube shafts 1 vertically movably inserted in the steady rest 17 and simultaneously rotates the outer pipe shaft 2. It rotates at high speed. The inner shaft 4 is rotated at a high torque and jets cement milk or other consolidation liquid 8 from the hole 6 while drilling the ground with the drilling bit 5. In this case, the congealing liquid 8 is also sprayed from the hole 6 of the outer tube shaft 2 rotating at a high speed to facilitate the drilling of the ground by the congealing liquid 8 discharged from the hole 6 of the inner shaft 4. . Then, the congealing liquid 8 is directly discharged to the excavated earth and sand that is agitated by the agitating and kneading means 3 of the outer tube shaft 2 that is rotated at a high speed, and stirring and mixing can be performed. The consolidating liquid 8 can be directly discharged to the excavated earth and sand that is agitated by the lower agitating and kneading means 3'provided on the inner shaft 4 to agitate and mix, and the excavated earth and sand and the aggregating liquid 8 can be agitated and mixed. Can be done efficiently,
Soft ground and hard ground can be continuously mixed and stirred effectively. Here, in discharging from the hole 6 of the inner shaft 4,
The consolidation liquid 8 is supplied through the pipe-shaped inner shaft 4 to form the holes 6
The condensing liquid 8 is discharged from the outer tube shaft 2
In order to discharge the solidification liquid 8 from the hole 6 on the side of the, the solidification liquid 8 is supplied into the outer tube shaft 2 and discharged from the hole 6. The consolidation liquid 8 sprayed from the inner shaft 4 rotating at high torque also serves to destroy the ground below the drill bit 5. Here, since the inner shaft 4 is rotated by a high torque, the drilling capacity is increased, and the drilling can be surely performed not only on the soft ground but also on the hard ground. By the way, the double pipe drilling machine of the present invention is provided with the rotation direction conversion control unit 7 for controlling the double pipe shafts 1 which rotate separately after a predetermined time so as to rotate in opposite directions. Therefore, the double pipe shaft 1 that rotates independently of each other after a fixed time elapses is rotated in the opposite direction while the cement milk or other consolidation liquid 8 and the soil are mixed. In this way, the rotation direction conversion control unit 7
By rotating the heavy pipe shaft 1 in the opposite direction at regular time intervals, the hard ground and the soft ground can be continuously stirred and kneaded. As described above, the ground is improved by forming a wall body having a substantially rectangular cross section in the ground.
It is also possible to form a mountain retaining wall by continuously performing this.

In the above embodiment, the upper part of each double pipe shaft 1 is attached to the multi-shaft device 10, and the outer pipe shaft 2 of the double pipe shaft 1 is rotated at a high speed through the transmission mechanism in the multi-shaft device 10 portion and the inner shaft 4 is installed. Although the embodiment in which the double shaft is rotated by high torque is shown, the outer pipe shaft 2 is rotated at high speed and the inner shaft 4 is rotated by high torque by using the speed change mechanism by the separate driving devices 23 for the double pipe shafts. You may do it. FIG. 5 is a block diagram showing the structure of the rotation driving means in this embodiment. In this embodiment, there is shown an embodiment in which three double tube shafts 1 are arranged in parallel,
The rotation direction control signals Va, Vb, Vc are output from the rotation control unit 22 based on the operation unit 20 output and the timer unit 21 output, and each rotation direction switching unit 24a, based on the rotation direction control signals Va, Vb, Vc. The rotation direction of each drive device 23 is switched by switching between 24b and 24c.

In the above-described embodiment, an example in which a plurality of double pipe shafts 1 are arranged in parallel to form a double pipe drilling and kneading machine is shown.
The double pipe shaft 1 may constitute a double pipe hole kneading machine.

In the present invention, as described above, when stirring and kneading the excavated soil and the congealing liquid, a high torque rotation (high torque) with the stirring and kneading means 3 provided on the outer tube shaft 2 rotating at high speed is performed. The rotation is normally low.) The stirring and kneading is performed by the lower stirring and kneading means 3'provided on the inner shaft 4, 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 rotating at high speed and the stirring and kneading means 3'rotating at low speed so as to rotate in opposite directions.

As the stirring and kneading means 3 in the present invention, various types such as blades and screws can be considered, but the point is that it has a stirring and kneading action, and is not particularly limited.

In each of the above embodiments, the outer pipe shaft 2 and the inner shaft 4 of the double pipe shaft 1 are used.
In the above embodiments, the same drive device 23 is used to drive the transmission through the transmission. However, in each of the above embodiments, the outer pipe shaft 2 and the inner shaft 4 of the double pipe shaft 1 are separate drive devices. 23a, 23b may be driven respectively,
In this case, as shown in FIG. 7, the rotation control unit 22 outputs the rotation direction control signals Vd and Ve of the drive devices 23a and 23b based on the output of the operation unit 20 and the output of the timer unit 21 to control the rotation direction. Each rotation direction switching unit 24 based on the signals Vd, Ve
By switching d and 24e, the rotation directions of the drive devices 23a and 23b are switched.

[Effects of the Invention] In the present invention, as described above, they rotate separately from each other.
In the heavy pipe shaft, the outer pipe shaft is rotated at high speed and the outer surface is provided with a stirring and kneading means and a hole for discharging the liquid is provided. The inner shaft is provided with high torque rotation and is provided with a lower stirring and kneading means and a hole is drilled at the tip. Since there is a hole for discharging the liquid and a rotation direction conversion control unit for controlling the double tube shaft to rotate in the opposite direction at regular intervals, the inner shaft rotates at high torque. Not only soft ground but also hard ground can be drilled, and moreover, the congealing liquid can be discharged directly to the excavated earth and sand that is agitated by the agitating and kneading means of the outer tube shaft that rotates at high speed for agitation and mixing. (Torque rotation is usually low-speed rotation) The consolidating liquid can be discharged directly to the excavated earth and sand that is agitated by the lower agitating and kneading means provided on the inner shaft, and agitated and mixed. Efficiently stirs and mixes, soft ground, hard The ground can be continuously and effectively agitated and mixed, and in this agitating and kneading, a rotation direction conversion control unit for controlling the double pipe shaft to rotate in the opposite direction at regular intervals is provided. Stirring and kneading are automatically performed in the opposite direction with the lapse of time, and as a result, there is an effect that the hard ground and the soft ground can be further continuously and uniformly stirred and kneaded to improve as a unit.

[Brief description of drawings]

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 a steady rest portion of the same, and FIG. 4 is a rotational direction conversion control of the same. FIG. 5 is a block diagram showing the configuration of means for controlling the rotation direction of the driving device by the unit, and FIG. 5 is a block diagram showing the configuration of another embodiment of the means for controlling the rotation direction of the driving device by the rotation direction conversion control unit. FIG. 6 is a cross-sectional view of another embodiment of the present invention, and FIG. 7 is a block diagram showing the structure of means for controlling the rotation direction of a drive unit by a rotation direction conversion control unit of still another embodiment of the present invention. Where, 1 is a double tube shaft, 2 is an outer tube shaft, 3 is a stirring and kneading means, 3'is a lower stirring and kneading means, 4 is an inner shaft, 5 is a drilling bit, 6 is a hole, and 7 is a rotating shaft. The direction change control unit 8 is a consolidation liquid.

Claims (4)

[Claims] 1. In a double tube shaft rotating independently of each other, an outer tube shaft rotates at a high speed, an outer surface is provided with a stirring and kneading means and a hole for discharging a liquid, and an inner shaft rotates at a high torque. A lower stirring and kneading means is provided, a drill bit is provided at the tip, a hole for discharging a liquid is provided, and a rotation direction conversion control unit for controlling the double tube shaft to rotate in the opposite direction at regular intervals is provided. A double pipe hole kneading machine characterized by being made. 2. The double pipe hole kneading machine according to claim 1, wherein a plurality of double pipe shafts are arranged. 3. The method according to claim 2, wherein the rotation trajectories drawn by the agitating and kneading means of the adjacent double tube shafts are set so that they partially overlap each other in plan view. Heavy pipe drilling kneader. 4. In a double tube shaft rotating independently of each other, an outer tube shaft rotates at high speed, an outer surface is provided with a stirring and kneading means and a hole for discharging liquid, and an inner shaft carries out high torque rotation. A lower stirring and kneading means is provided, a drill bit is provided at the tip, a hole for discharging a liquid is provided, and a rotation direction conversion control unit for controlling the double tube shaft to rotate in the opposite direction at regular intervals is provided. A double pipe drilling kneader is formed, and the ground is drilled while injecting cement milk and other hardening liquids with this double pipe drilling kneading machine, and cement milk and other hardening liquids are added to the ground. Cement milk or other congealing liquid and earth and sand are mixed by the stirring and kneading means of the outer tube shaft and the lower stirring and kneading means of the inner shaft, and during this mixing, the double tube shaft is moved at regular intervals. Using a double pipe drilling kneader characterized by rotating in the opposite direction Improved method of ground.