JPH0368966B2 - - Google Patents

Description

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

Conventionally, ground improvement construction machines used for improving soft ground, etc. are equipped with a lower end bit and a cutter projecting from the side, and these bits and cutters disturb the ground to be improved, and at the same time disturb the disturbed ground with cement milk, etc. A ground improvement device that injects soil improvement agent is installed on a ground base machine (e.g. crawler type self-propelled vehicle).
It has a structure in which it is supported by a rod that can be raised and lowered along an erected guide pillar, and the rotating part of the ground improvement device is rotated via a drive shaft etc. by a drive device supported by the base machine. It was hot.

However, in the case of such a construction machine, when the depth of the ground to be improved is large, the support rod becomes long, the guide column becomes long, and the drive shaft etc. also becomes long, and as a result, the overall It was large and heavy, tended to be unstable, making it inconvenient to use, and the cost of ground improvement work increased due to the increased manufacturing costs of support rods, guide columns, etc.

The purpose of the present invention is to provide a ground improvement construction machine that eliminates such conventional problems.The purpose of this invention is to provide a ground improvement construction machine that eliminates such conventional problems.
A frame body with an open lower end is connected to the guide column so as to be movable up and down, and a ground improvement unit having a size that can be inserted into and removed from the frame body from the lower end opening is connected to the base machine so that it can be fitted into and removed from the frame body. A ground improvement construction machine, characterized in that the ground improvement unit is suspended from a winch supported by a rope so that it can be raised and lowered, and the ground improvement unit is capable of stirring the ground to be improved and injecting a ground improvement agent into the agitated ground. This is achieved by Note that in this specification, the term "rope" refers not only to a rope in a normal sense but also to a chain or the like.

According to the present invention, the ground improvement unit is suspended by a rope from the winch on the base machine so that it can be fitted into and removed from the frame that can be moved up and down along the guide pillars installed on the base machine, and the rope is sufficiently wound up. If the unit is fitted into the frame, the construction machine can be easily moved to a predetermined position, and the ground can be improved by letting out the rope appropriately, so the whole structure is compact. It is easy to use, is inexpensive to manufacture, and allows ground improvement work to be carried out safely and efficiently.

Embodiments of the present invention will be described below with reference to the drawings.

One embodiment of the invention shown in FIGS. 1 and 2 is as follows:
A base machine 4, a guide pillar 5 erected thereon,
It includes a frame 6 connected to the pillar 5, a winch 7 supported by the machine 4, and a ground improvement unit 1 suspended from the winch 7 by a rope R.

The base machine 4 is a self-propelled vehicle equipped with a crawler 41.

The guide column 5 is supported by a pair of upper arms 51 (only one shown) extending forward from the base machine 4 and a pair of lower arms 52 (only one shown). It is erected.

The front end of each upper arm 51 is rotatably connected to the column 5, and the rear end is connected to the machine 4 so as to be rotatable and slightly slidable back and forth. The front end of each lower arm 52 is fixed to the column 5, and the rear end is rotatably connected to the machine 4. A piston rod 531 of a piston cylinder device 53 rotatably supported on the machine 4 is rotatably connected to each upper arm 51, and the posture of the column 5 can be controlled by this device 53.

The frame body 6 is connected to the front side of the column 5 so as to be able to move up and down along the column 5 between stoppers 54 and 55 at the upper and lower ends of the column. The frame body 6 is formed in the shape of an inverted cage and has an opening at the lower end, and has a size that allows the upper case 3 of the ground improvement unit 1 to be inserted into and removed from the frame body 6 through this opening 61.

The winch 7 is attached to the rear surface of the pillar 5 and is supported by the machine 4 via the pillar 5.

The center part of the upper case 3 of the unit 1 is suspended from a rope R through the central opening at the upper end of the frame 6, and this rope is guided by pulleys 56 and 57 provided at the upper end of the column and wound around the winch 7. ing.

There is another winch 8 on the base machine 4.
This winch is equipped with an electric supply line 34 and a flexible pipe P for supplying ground improvement liquid, and these lines and pipes are guided by a pulley 58 on the pillar 5 and are attached to the frame. The body 6 is connected to the unit 1 through an opening at its upper end.

The wire 34 on the winch 8 and the pipe P are connected to a suitable switch and power source (not shown) and a soil improvement liquid supply device (not shown) via a rotary joint 81 for electricity and liquid. has been done.

Figures 3 to 6 show an example of a soil improvement unit, and this unit 1 consists of a pair of lower cases 2 on the left and right, an upper case 3 that is symmetrical in the front and back, and a pair of lower cases 2. It has something to support it. 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 cases 2, the arm cutter positions are vertically shifted between the left and right sides so that the overhanging arm cutters 12 do not collide with each other. Therefore, the lower case 2 has a slight difference in outer shape between the left and right sides.

In addition, if necessary, the cutter positions can be set at the same height on the left and right lower cases 2 without shifting up and down.
Instead, an appropriate form can be adopted, such as making the lengths of the cutters shorter than those shown in the figure so that they do not collide with each other.

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 118 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 128 in the form of a pin is protruded from the cutter shaft 121, and a soil 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, an appropriate one can be adopted as required, such as a combination of a bevel gear and a spur gear.

The drive shaft 211 has upper and lower bearings 218 and 214.
It is rotatably supported by the lower case 2 via.

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 32 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, 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 Gear electric device 351 (only one shown) that transmits rotational force to case 2
In order to cancel the force applied to the upper case 3 due to the rotation of the lower case 2 on the left and right sides,
The left and right lower cases 2 are rotated in opposite directions.

Each electric motor 35M is connected to an electric supply line 34 drawn into the case 3, and is 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 examples, a device consisting of one electric motor and a transmission device that transmits the rotational force of the motor to each lower case 2 can be adopted as appropriate.

A liquid passage L is formed in the lower case 2, and these passages are connected to each cutter via an annular passage (l ₁ ) surrounding each cutter shaft 121 and an annular passage (l ₂ ) surrounding the bit shaft. Shaft fluid passage 12
4 and a liquid agent passage 118 of the bit shaft.

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

A flexible pipe P for supplying soil improvement agent is connected to this annular passage (l ₃ ), and by remote control, the liquid agent outlet 124m of each extending arm cutter 12 and the liquid agent outlet of the tip bit 11 can be connected to the annular passage (l 3 ). 1
The ground improvement liquid can be discharged from a height of 13 meters.

On both sides of each of the annular passages (l ₁ ), (l ₂ ), and (l ₃ ), a sealing material (OR ₁ ) such as an O-ring,
(OR ₂ ) and (OR ₃ ) are fitted, and an O-ring or other appropriate sealing material 37 is also fitted to the wall portion of the upper case 3 through which the lower case 2 passes.

These sealing materials (OR ₁ ), (OR ₂ ) and 37 are
It also prevents dirt and water from entering into cases 2 and 3. The portions of each electric supply line 34 and each pipe P that penetrate the case 3 wall are also sealed.

The upper end center portion of the upper case 3 is suspended by the rope R as described above.

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 pressure 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 or smaller than the contour dimensions of the ground plane disturbed by the bit 11 and the cutter 12.

Further, the entire unit 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, initially, the rope R is wound up by the winch 7 and the soil improvement unit 1 is raised to its upper limit. In this state, the frame pair 6 is also at its upper limit, and the rope It is now in a state where it was once supported.

In this state, the base machine 4 is operated, and the unit 1 is moved onto the soft ground G to be improved without being swung around because it is fitted into the frame 6.

Here, the left and right electric motors 33 in the unit 1
Turn M, thereby rotating the left and right tip bits 11 and the overhanging arm cutter 12 around their axes, and in this state, let out the rope R from the winch 7 and lower the unit 1 toward the ground G to be improved. For example, the frame 6 also moves down along the pillar 5 together with the unit 1 to the stopper 55, and then the unit 1
escapes from frame 6 and descends further, bit 11
and the cutter 12 disturb the ground G, and at the same time the entire unit sinks under its own weight into the disturbed ground.

When the improved unit 1 reaches a predetermined depth in the ground, the bit 11 and cutter 1 are removed as shown in Figure 6.
2 continues to rotate as it is, supplying soil improvement liquid such as cement milk from the left and right pipes P, and discharging it into the ground G from the discharge port 118m of the bit 11 and the discharge port 124m of the cutter 12. Then, when the left and right motors 35M are rotated, the left and right lower cases 2 are extended and the arm cutters 12 are rotated in opposite directions, and the entire unit 1 is lifted up. The area injected with the agent can be easily improved. In this way, by carrying out the above operations one after another on the ground G while moving the unit 1 with the base machine 4, the desired range of ground improvement can be achieved.

FIG. 7 shows in principle other examples 33' and 35' of the first drive and the second drive in a soil improvement unit. When these drive devices are employed, the shapes of the upper case and the lower case may also be changed as necessary.

This first drive device 33' has an electric motor 33M prepared for the drive shaft 211' in each lower case 2'.
The drive shaft 21
It is connected to 1'.

The rotation of the drive shaft 211' is similar to the previous embodiment.
It is transmitted to the cutter 12 and the bit 11 via the gear transmission 212.

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'. By raising the intermediate shaft 353 from the position shown in FIG. 7, 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 that can be moved up and down by a spring offset type electromagnetic drive device 341 via a rotation lever 342.

Therefore, when the intermediate shaft 353 is raised by the shaft drive section 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. As the lower case 2' supporting the gear 358 rotates, the gear 358 rotates.

[Brief explanation of drawings]

Figures 1 and 2 show a side view and a front view of one embodiment of the present invention, Figures 3 to 6 show an example of a ground improvement unit, and Figure 3 shows an example of the upper case.
FIG. 4 is a side view, FIG. 5 is a plan view, and FIG. 6 is an explanatory view of the state of use.
Figure 7 shows the first and second stages in the soil improvement unit.
FIG. 6 is a diagram illustrating the principle of another example of the drive device. DESCRIPTION OF SYMBOLS 1... Ground improvement unit, 11... Tip bit, 111... Bit shaft, 113... Ground improvement agent discharge path, 12... Overhanging arm cutter, 121
... Cutter shaft, 124 ... Improver discharge path, 2,
2'...Lower case, 3, 3'...Upper case, 3
3, 33'...first drive device, 35,35'...second drive device, 211,211'...drive shaft, 21
2... Gear transmission, 4... Base machine, 5...
...Guide pillar, 6...Frame body, 61...Frame body lower end opening,
7...Winch, R...rope.

Claims (1)

[Claims] 1. A guide column is erected on a self-propelled base machine,
A frame body with an open lower end is connected to the guide column so as to be movable up and down, and a ground improvement unit having a size that can be inserted into and removed from the frame body from the lower end opening is connected to the base machine so that it can be fitted into and removed from the frame body. A ground improvement construction machine, characterized in that the ground improvement unit is suspended from a winch supported by a rope so that it can be raised and lowered, and the ground improvement unit is capable of disturbing the ground to be improved and injecting a ground improvement agent into the disturbed ground. . 2. The ground improvement unit supports a tip bit having a soil improvement agent discharge path on the lower end of the case so as to be rotatable around the bit shaft, and an overhanging arm cutter having the soil improvement agent discharge path can be rotated around the cutter shaft. 1 supported on the side of the case
A pair of lower cases, an upper case supporting each of the lower cases rotatably about the center line of the bit shaft, and an upper case for rotating the tip bit and the overhanging arm cutter about their axes. a first drive device provided therein; a transmission device provided in the lower case for transmitting the power of the first drive device to the tip bit and the overhang arm cutter; and the upper case for rotating the lower case. 2. The ground improvement construction machine according to claim 1, wherein the ground improvement construction machine is equipped with a second drive device disposed in the ground improvement machine, and is capable of being remotely controlled while being suspended from a rope and raised and lowered.