JPH07100934B2 - 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.
Further, there is one in which the congealing liquid is discharged from the tip of the rotary shaft while being drilled, 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 is performed 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, in the conventional double-pipe drilling kneader, when agitating and kneading the excavated soil and the congealing liquid, only the agitating and kneading means by the agitating and kneading means provided on the outer tube shaft is used. Because it was kneading,
The kneading with stirring was insufficient.

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 Problem] In 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 provided with the stirring and kneading means 3. And a hole 6 for ejecting liquid is provided,
Inner shaft 4 has high torque rotation and drill bit 5 at the tip
And a lower stirring and kneading means 3'and a hole 6 for discharging a liquid.

Here, a plurality of double tube shafts 1 may be arranged. And
It is set so that a part of the rotation trajectories drawn by the stirring and kneading means 3 of the adjacent double tube shafts 1 and a part of the rotation trajectories drawn by the lower stirring and kneading means 3 ′ overlap each other in a plan view. May be.

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 Is provided with a hole 6 through which the liquid is discharged, the inner shaft 4 is rotated with high torque, a drill bit 5 is provided at the tip, a lower stirring and kneading means 3'is provided, and a hole 6 through which the liquid is discharged is provided. A double-tube drilling kneader is formed, and holes are created with this double-tube drilling kneader.
The ground is drilled while injecting the cement milk or other consolidation liquid 8 from the ground, the cement milk or other consolidation liquid 8 is injected into the ground, and the stirring and kneading means 3 of the outer tube shaft 2 and the inner shaft 4 are The lower stirring and kneading means 3'mixes the cement milk or other consolidation liquid 8 and the earth and sand.

[Operation] Therefore, the outer tube shaft 2 is rotated at a high speed, the stirring and kneading means 3 is provided on the outer surface, and the hole 6 for discharging the liquid is provided.
Has high torque rotation, has a drill bit 5 at the tip, and has a hole 6 through which liquid is discharged.
Is a hole that is drilled not only on soft ground but also on hard ground as a result of high torque rotation, and when stirring and kneading the excavated soil and the consolidation liquid, agitate by the agitating and kneading means 3 of the outer tube shaft 2 rotating at a high speed. The congealing liquid 8 can be directly discharged onto the excavated earth and sand to stir and mix, and the lower stirrer kneading means 3'provided on the inner shaft 4 that rotates with high torque (usually low speed for high torque rotation). The congealing liquid 8 can be directly discharged to the excavated soil that is agitated and mixed by stirring, and the excavated soil and the congealing liquid 8 can be more efficiently agitated and mixed, and the soft ground and the hard ground can be continuously effective. It became possible to stir and mix.

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

1 to 3 show an example of a double pipe drilling-related 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. Further, the inner shaft 4 is provided with a lower stirring and kneading means 3 '. Here, a part of the rotation trajectories drawn by the stirring and kneading means 3 of the adjacent double tube shafts 1 and a part of the rotation trajectories drawn by the lower stirring and kneading means 3 ′ overlap each other in a plan view. It is set. With this arrangement, the excavated soil and the congealing liquid can be uniformly kneaded in the lateral direction. 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 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, the rotation of the drive device 23 such as a prime mover is transmitted to the multi-spindle device 10, and the transmission mechanism is provided in each multi-spindle device 10 part. The outer tube shaft 2 of the shaft 1 is rotated at high speed, and the inner shaft 4 is rotated with high torque. 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 squeezing, and the bearing portion 15 to connect with the outer pipe. The shaft 2 or the inner shaft 4 is rotatably loosely fitted. In the figure, 16 is a crawler crane, 17 is a steady rest installed under the rail 18 of the crawler crane 16, and the steady rest
A plurality of double tube shafts 1 move up and down in the inside of 17. According to the present invention, in the double-pipe drilling and kneading machine having the above-described structure, the two machines that rotate separately after a certain period of time
A rotation direction conversion control unit 7 is provided to control the heavy tube shaft 1 to rotate in the opposite direction.

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 consolidation liquid 8 is also ejected from the hole 6 of the outer tube shaft 2. Then, the excavated earth and sand and the consolidating liquid 8 rotate at high torque (that is, normally at low speed for high torque rotation), the inner shaft 4
The lower stirring and kneading means 3'provided in the above and the stirring and kneading means 3 provided in the outer tube shaft 2 rotating at a high speed are agitated and kneaded. In this case, the inner shaft 4 rotating at a high torque is rotated by the outer tube shaft 2. By setting to rotate at low speed, low speed stirring and kneading by the stirring and kneading means 3 provided on the inner shaft 4 that rotates at low speed,
The stirring and kneading is performed by the high speed stirring and kneading by the lower stirring and kneading means 3 ′ provided on the outer tube shaft 2 which rotates at a high speed, and at this time, 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. Can be effectively mixed with stirring. Here, in discharging from the hole 6 of the inner shaft 4, the consolidation liquid 8 is supplied through the inside of the pipe-shaped inner shaft 4 and the consolidation liquid 8 is discharged from the hole 6, and In order to discharge the consolidation liquid 8 from the hole 6 on the side of the tube shaft 2, the consolidation liquid 8 is supplied into the outer tube shaft 2 to be discharged from the hole 6. In this case, the consolidation liquid 8 ejected at the tip destroys the ground below the drilling bit 5. Here, since the inner shaft 4 is rotated by a high torque, the drilling capability is increased, and the drilling can be surely performed not only on the soft ground but also on the hard ground. In the above embodiment, the rotation direction conversion control unit 7 that controls the double tube shafts 1 that rotate independently of each other after a certain period of time to rotate in opposite directions.
Since it is equipped with cement milk and other hardening liquid 8
The double pipe shaft 1, which rotates independently of each other after a predetermined time elapses during the mixing of the sand and the sand, is rotated in the opposite direction.
In this way, by rotating the double tube shaft 1 in the opposite direction by the rotation direction conversion control unit 7 at regular time intervals, the hard ground and the soft ground can be continuously and uniformly stirred and kneaded. As described above, the wall body having a substantially rectangular cross-section is formed in the ground to improve the ground, but the mountain retaining wall can be formed by continuously performing the ground improvement.

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 high torque rotation is performed has been shown, the double tube shaft 1 is driven by the respective separate drive devices 23 and the outer tube shaft 2 is formed by using the speed change mechanism.
May be rotated at high speed and the inner shaft 4 may be rotated at high torque. 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 side by side. Based on the output of the operation unit 20 and the output of the timer unit 21, the rotation control unit 22 outputs rotation direction control signals Va, Vb, Vc is output, and the rotation direction switching units 24a, 24b, 24c are switched based on the rotation direction control signals Va, Vb, Vc to switch the rotation direction of each drive device 23.

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.

By the way, in the present invention, the stirring and kneading means 3 rotating at a high speed and the stirring kneading means 3'rotating at a low speed are rotated in opposite directions, whereby more efficient stirring can be performed.

As the stirring and kneading means 3 and the lower stirring and kneading 3'in the present invention, various things such as blades and screws can be considered.

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 23.
It may be driven by a and 23b respectively. In this case, as shown in FIG. 7, the rotation direction control signals Vd and Ve are output from the rotation control unit 22 based on the output of the operation unit 20 and the output of the timer unit 21. Is output, and the rotation direction switching units 24d and 24e are switched based on the rotation direction control signals Vd and Ve to switch the rotation directions of the drive devices 23a and 23b.

[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 rotates at high speed, the outer surface is provided with a stirring and kneading means, and the hole 6 for discharging the liquid is provided, the inner shaft is rotated at high torque, and the tip has a drilling bit. Since it has a lower stirring and kneading means and has a hole for discharging liquid, the inner shaft can rotate with high torque to drill holes in not only soft ground but also hard ground, and stirring and kneading the excavated soil and the consolidation liquid. At this time, the congealing liquid is 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 a high speed to perform agitation and mixing, and also high torque rotation (usually low speed rotation for high torque rotation) The congealing 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 to agitate and mix, and thus, the agitating and mixing of the excavated earth and sand and the congealing liquid are both complex and efficient. The hard ground and the soft ground can be continuously and evenly stirred. Those that can improve integrally made kneading.

Further, by arranging a plurality of double pipe shafts, it is possible to improve a large area of ground in which the hard ground and the soft ground are continuously stirred and mixed as described above. Also in this case,
By setting such that a part of the rotation loci drawn by the stirring and kneading means of the adjacent double tube shafts and a part of the rotation loci drawn by the lower stirring and kneading means overlap each other in a plan view,
More uniform stirring and kneading is possible.

Furthermore, in the invention of the method of the present invention, the ground improvement having the above characteristics can be easily performed.

[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 8 is a solid. It is a binding solution.

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 is provided, and an inner shaft carries out a high torque rotation. A double pipe drilling and kneading machine having a drilling bit at its tip, a lower stirring and kneading means, and a hole for discharging a liquid. 2. The double pipe hole kneading machine according to claim 1, wherein a plurality of double pipe shafts are arranged. 3. A setting is made such that a part of the rotation loci drawn by the stirring and kneading means of the adjacent double tube shafts and a part of the rotation loci drawn by the lower stirring and kneading means partially overlap each other in plan view. The double-pipe drilling and kneading machine according to claim 2, wherein 4. 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 is provided, and an inner shaft carries out a high torque rotation. A bit for drilling is provided at the tip, a means for lower stirring and kneading is provided, and a hole for discharging a liquid is provided to form a double pipe drilling and kneading machine. The soil is drilled while injecting the consolidation liquid of, and the cement milk and other consolidation liquids are injected into the ground, and the mixture of cement milk and other components is mixed by the stirring and kneading means of the outer tube and the lower stirring and kneading means of the inner shaft. A method for improving a ground using a double pipe drilling and kneading machine, which comprises mixing a congealing liquid and earth and sand.