JPH0410525B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ground improvement device, particularly to a ground improvement device that is advantageous for use in improving soft ground.

Conventionally, a device used for improving soft ground, etc. is equipped with a lower end bit and a cutter projecting from the side, and these bits and cutters disturb the ground to be improved to a predetermined depth, and at the same time, mix cement milk, etc. into the disturbed ground. A device for injecting ground improvement agent is known.

However, this type of soil improvement device uses a guide pillar installed on a base machine (e.g., a self-propelled vehicle with a caterpillar type) on the ground to guide the device down to a predetermined depth in the ground and then pull it up again. teeth,
When improving the underwater ground, the equipment is supported and guided by a rod that can be raised and lowered along a guide column set up on a barge, and the rotating part of the equipment is
Since it is operated via a drive shaft from a drive device on the ground or on a barge, it can be In such cases, the support guide rod becomes long, and therefore the guide column on the base machine or barge becomes long, as well as the drive shaft, etc., resulting in an increase in overall size and weight. However, it tends to be unstable and is inconvenient to use, and the cost of ground improvement work increases due to the increased manufacturing cost of support guide rods, guide columns, etc.

Furthermore, there has been conventionally known a ground improvement device that is suspended from a rope and raised and lowered by remote control (see, for example, FIG. 1 of Japanese Utility Model Application No. 56-73748). However, in this known rope suspension system, the drive device cannot penetrate into the disturbed ground because its planar profile is larger than the planar profile of the disturbed ground formed by the rotation of the excavating blade. It has no choice but to stay on the ground. Therefore, if the depth of the ground to be improved is large, the drive shaft that connects the drive device and the tip rotating part (for example, the excavation blade) will be quite long, and this rope-suspended type is also similar to the conventional device described above. I have a problem with this.

SUMMARY OF THE INVENTION An object of the present invention is to provide a soil improvement device that eliminates the problems associated with conventional soil improvement devices.

The above-mentioned object of the present invention is to provide a ground improvement device that can be lifted and lowered by remote control while suspended from a rope, in which a tip bit having a soil improvement agent discharge path is rotatably supported at the lower end of the case around the bit axis. and a pair of lower cases in which an overhanging arm cutter having a soil improvement agent discharge passage is rotatably supported on the side of the case about the cutter axis, and each of the lower cases is rotatable about the center line of the bit axis. an upper case supporting the cutter; a first drive device disposed on the upper case for rotating the tip bit and the overhang arm cutter about their axes; a transmission device disposed in the lower case for transmitting information to the arm cutter;
a second drive device disposed on the upper case for rotating the lower case, and the planar contour dimensions of the upper and lower cases are formed by rotation of the bit and arm cutter about a bit axis and a cutter axis. This is achieved by a ground improvement device characterized in that the size range is set within the planar contour size of the disturbed ground. In addition,
In this specification, the term "rope" refers to not only a rope in the usual sense but also a chain and the like.

According to the device of the present invention, when penetrating into the ground to be improved, the tip bit and the arm cutter are in the first position.
The drive device is activated to rotate the bit and cutter shafts, and this rotation disturbs the ground.
According to the present invention, the planar contour dimensions of the above and lower cases are set within a dimension range that falls within the planar contour dimensions of the disturbed ground formed by the rotation of the tip bit and arm cutter around the bit axis and cutter axis. Therefore, as the ground is disturbed by the tip bit and arm cutter, the upper and lower cases, along with the first and second drive devices stored inside, will follow the tip bit and arm cutter and settle into the disturbed ground by their own weight. You can move in while doing so. In this way, the entire device including the drive device can enter the disturbed ground, so the length of the drive shaft that connects the drive device and the tip rotating section should at least be long enough to connect the two in the device design. That's enough,
It is no longer affected by the depth of the ground to be improved. By configuring the device of the present invention to be suspended from a rope and raised and lowered by remote control, when the ground to be improved is deep, it can be handled simply by letting out the rope, which is simple, safe, and reliable. It becomes possible to perform ground improvement at low cost.

Embodiments of the present invention will be described below based on the accompanying drawings.

An embodiment of the device 1 shown in FIGS. 1 to 4 includes a pair of left and right lower cases 2, and an upper case 3 that is symmetrical in the front and back and supports the pair of lower cases 2. . Each lower case 2 supports a tip bit 11 at the lower end of the case, and supports two vertically parallel overhanging arm cutters 12 on the sides of the case. In the left and right lower case 2,
In order to prevent the overhanging arm cutters 12 from colliding with each other, the arm cutter positions are vertically shifted between the left and right sides. Therefore, the lower case 2 has a slight difference in outer shape between the left and right sides.

In addition, if necessary, in the left and right lower end cases 2, the cutter positions are set at the same height without being shifted up and down, and instead, the cutter lengths are made shorter than those shown in the figure to prevent them from colliding with each other.
Any suitable format can be adopted.

In each lower case 2, the tip bit 11 is
The vertical bit axis 111 is the upper and lower bearings 112.
The bit shaft is supported by the lower case 2 via the bit shaft, and is rotatable about the bit shaft. Bit axis 1
11, a ground improvement liquid agent discharge path 113 is formed.

Each overhanging arm cutter 12 has a cutter shaft 121 that passes through the side of the lower case 2 in a cross shape and is supported by the case 2 via left and right bearings 122, and is rotatable around the cutter shaft. ing.

A cutter blade 123 in the form of a pin is protruded from the cutter shaft 121, and a ground improvement liquid discharge path 124 is formed.

The cutter blade on the cutter shaft can have various shapes depending on the ground.

A transmission device 21 is provided in each lower case 2, and this transmission device 21 connects a drive shaft 211 disposed in the upper space of the lower case 2, and controls the rotation of this shaft to the upper cutter shaft 121, the lower cutter shaft 121, and the lower cutter shaft 121. It consists of a bevel gear transmission 212 that sequentially transmits power to the cutter shaft 121 and the bit shaft 111. Note that instead of this bevel gear transmission device, any suitable transmission means may be employed as required, such as a combination of a bevel gear and a spur gear. The drive shaft 211 has upper and lower bearings 213 and 2
It is rotatably supported by the lower case 2 via 14.

The upper part of the lower case 2 is inserted into the upper case 3 and rotatably supported by the case 3 via upper and lower bearings 31 and 32 inside the case 3. The rotation center lines of case 2 and bit 11 coincide.

A first drive device 33 is provided in the case 3, and the device 33 is connected to the drive shaft 2 in each lower case 2.
The electric motor 33M consists of a total of two electric motors 33M (only one is shown) connected to the electric motor 11. Each electric motor 33M is
It is connected to an electric supply line 34 drawn into the case 3 from a power supply (not shown), and is operated remotely.

In addition, a second drive device 35 is provided inside the case 3, and this device 35 includes a total of two electric motors 35M (only one shown) prepared for each lower case 2 and a lower It consists of two sets of gear transmissions 351 (only one is shown) that transmit rotational force to the case 2. The cases 2 are rotated in opposite directions.

Each electric motor 35M is connected to an electric supply line 34 drawn into the case 3 from an unillustrated power source,
Vehicles are increasingly being operated remotely.

In addition to the above-mentioned example, the first drive device includes one electric motor and its rotational force that is transmitted to each drive shaft 21.
A transmission device for transmitting data to 1 can be adopted as appropriate.

Further, as the second drive device, in addition to the above-mentioned example, one consisting of one electric motor and a transmission device that transmits the rotational force of the electric motor to each lower case 2 can be adopted as appropriate.

A liquid agent passage L is formed in the lower case 2, and these passages allow the liquid of each cutter shaft to flow through an annular passage _l1 surrounding each cutter shaft 121 and an annular passage _l2 surrounding the bit shaft. It communicates with the passage 124 and the liquid passage 113 of the bit shaft.

A ring 36 surrounding the lower case 2 is installed inside the upper case 3, and this ring 36 is an annular passage l ₃ communicating with the upper end of the passage L in the lower case.
It is equipped with

A flexible pipe P extending from a ground improvement liquid supply device (not shown) is connected to this annular passage _l3 , and thereby the liquid discharge port 124m and tip bit of each overhanging arm cutter 12 can be controlled by remote control. 1
The ground improvement liquid can be discharged from the liquid discharge port 113m.

Sealing materials OR ₁ , OR ₂ and OR ₃ such as O-rings are fitted on both sides of each of the annular passages l ₁ , l ₂ and l ₃ , and the wall portion of the upper case 3 through which the lower case 2 penetrates. Also, an O-ring or other suitable sealing material 37 is fitted.

These sealing materials OR ₁ , OR ₂ and 37 also prevent dirt and water from entering into the cases 2 and 3. Case 3 of each electric supply line 34 and each pipe P
The wall penetrations are also sealed. The upper end center portion of the upper case 3 is suspended by a rope R.

Note that 38 in the upper case is a suitable tilt detection device, and a signal from this device is sent to the outside of the case via a line not shown.

As can be seen from FIG. 3, the maximum thickness T of the bulged portion 30 of the upper case 3 above the tip bit 11 for accommodating the electric motor, etc.
The thickness of the other parts of the upper case 3 is approximately the same as, or slightly smaller than, the rotational diameter of the overhang arm cutter 12. Also,
The left-right length W of the case 3 is shorter than the length from the tip of the left cutter 12 to the tip of the right cutter 12. That is, the contour dimensions of the upper and lower cases in plan view are approximately the same as the contour dimensions of the ground plane that are disturbed by the rotation of the bit 11 and cutter 12 around the bit axis and cutter axis.
Or smaller. To set the dimensions of each part, the ground is disturbed by the rotation of the bit and arm cutter around the bit axis and the cutter axis, and the upper and lower cases 3,
2 etc. are necessary to allow the entire device to settle and penetrate.

Further, the entire device 1 is formed so that when it is suspended by the rope R, the weight is balanced in the front, back, left and right directions.

Therefore, the ground improvement device 1 is suspended by a rope R so that it can be raised and lowered from a winch mounted on a base machine such as a caterpillar self-propelled vehicle (not shown) or a winch mounted on a barge on the water. While maintaining the posture shown in the figure, the left and right electric motors 33M are turned by remote control via the electric supply line 34, thereby rotating the left and right tip bits 11 and the overhanging arm cutter 12 around their axes. Then, if the rope R is let out and the entire ground improvement device is lowered toward the soft ground G to be improved, bit 1
1 and the cutter 12 disturb the ground G, and at the same time, the entire device sinks under its own weight into the disturbed ground. As described above, since the entire apparatus including the drive device can descend under its own weight in the disturbed ground, the depth of the ground to be improved can be dealt with simply by controlling the amount of rope payout.

When the improvement device 1 reaches a predetermined depth in the ground, the bit 11 and cutter 12 continue to rotate, and a soil improvement liquid such as cement milk is supplied from the left and right pipes P, and this is poured into the bit 11. Outlet 113m and cutter 12 outlet 124
While discharging from m into the ground G, and rotating the left and right motors 35M, the left and right lower cases 2 are extended and the arm cutters 12 are rotated in opposite directions, and the entire device 1 is lifted. 11 and the cutter 12, and the parts injected with improveability are easily improved. In this way, by performing the above operations one after another on the ground G, the desired range of ground improvement can be achieved.

In addition, Fig. 5 shows the first
Other examples 33' and 3 of the drive device and the second drive device
5' is shown in principle. When these drive devices are employed, the shapes of the upper case and the lower case are also changed as necessary.

This first drive device 33' has an electric motor 33M prepared for the drive shaft 211' in each lower case.
The drive shaft 21
It is connected to 1'. The rotation of the drive shaft 211' is transmitted to the cutter 12 and the bit 11 via the gear transmission 212, as in the previous embodiment.

The second drive device 35' includes a sun gear 356 which is fitted onto the intermediate shaft 353 and rotatably supported by the upper case 3' via a bearing 355, and the upper case 3'.
Internal toothed ring gear 357 and gear 356 fixed to
and 357, and is rotatably supported by the lower case 2', and by raising the intermediate shaft 353 from the position shown in FIG. 5, the intermediate shaft 353 is connected to the sun gear 356. spline joint type clutch 359 and intermediate shaft 3
53 is provided with a shaft drive section 340 which can be moved up and down via a rotation lever 342 by a spring offset type electromagnetic drive device 341.

Therefore, when the intermediate shaft 353 is raised by the shaft drive unit 340, the clutch 359 engages with the sun gear, and the rotational force of the motor 33M is also transmitted to the planetary gears 358, causing these gears 358 to rotate and move the sun gear 3.
56, the lower case 2' supporting the gear 358 rotates.

[Brief explanation of drawings]

1 to 4 show one embodiment of the present invention, in which FIG. 1 is a front view with a portion of the upper case cut away, FIG. 2 is a side view, and FIG. 3 is a plan view. FIG. 4 is an explanatory diagram of the usage state, and FIG. 5 is an explanatory diagram of the principle of another example of the first and second drive devices. 1 is a ground improvement device, 11 is a tip bit, 111
113 is the bit shaft, 113 is the soil improvement liquid discharge path, 12
is the overhanging arm cutter, 121 is the cutter shaft,
124 is the improving agent discharge path, 2 and 2' are the lower case,
3, 3' are the upper case, 33, 33' are the first drive device, 35, 35' are the second drive device, 211, 21
1' is a drive shaft, 212 is a gear transmission, and R is a rope.

Claims (1)

[Claims] 1 In a ground improvement device that can be lifted and lowered remotely while suspended from a rope, a tip bit having a ground improvement agent discharge path is rotatably supported at the lower end of the case around the bit axis, and the ground improvement agent discharge path is a pair of lower cases that support an overhanging arm cutter having an overhanging arm cutter rotatably around the cutter shaft on the side of the case; an upper case that supports each of the lower cases rotatably around the center line of the bit shaft; a first drive device disposed in the upper case for rotating the tip bit and the overhang arm cutter about their axes;
a transmission device disposed in the lower case for transmitting the power of the first drive device to the tip bit and the overhang arm cutter; and a second drive device disposed in the upper case for rotating the lower case. and the planar contour dimensions of the upper case and the lower case are set within a dimension range that falls within the planar contour dimensions of the disturbed ground formed by the rotation of the bit and arm cutter around the bit axis and cutter axis. A ground improvement device characterized by: