JPS6243012B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an excavator equipped with an excavation shaft that moves up and down along a leader.

[Technical background of the invention and its problems]

A conventional excavator is provided with an excavation shaft rotation drive device that can move vertically from the top to the bottom of a leader supported by a base machine. connect,
The excavation shaft is inserted into the ground while lowering the excavation shaft rotation drive device.The above-mentioned excavation shaft rotation drive device has a reduction gear structure and is heavy due to its function of rotating the excavation shaft. It is undesirable to move the reader between the upper and lower parts in terms of stability of the reader. In addition, when inserting the excavation shaft to a very deep place underground, it is possible to add more excavation shafts in sequence according to the depth of insertion into the ground.For this, conventional excavation shaft rotation drive devices It is necessary to perform this addition work below, but the excavation shaft rotation drive device has a reducer structure and has a large diameter, and the excavation shaft to be added is suspended by a wire hanging from the upper end of the leader, so the above-mentioned With the wire hanging down through the large-diameter outer circumference of the rotary drive device, it is difficult to bring the excavation shaft close to the center of the rotary drive device, and the excavation shaft rotation drive device becomes an obstacle, making it difficult to add more excavation shafts. It is difficult to
Therefore, in order to avoid this type of work as much as possible, we use long and large leaders to continuously insert very long excavation shafts into the ground.
There are height restrictions, and depending on the conditions at the construction site, it may not be possible to erect such a long and large leader.

[Purpose of the invention]

The present invention is an excavator in which the vertical movement of an excavation shaft is guided by a leader, in which an excavation shaft rotation drive device can be provided under the leader, thereby stabilizing and downsizing the leader. be.

[Summary of the invention]

In the excavator of the present invention, a leader for guiding the vertical movement of a plurality of rows of excavation shafts is erected and supported by an upper support member and a lower support member protruding from a base machine, and the upper end of the leader A sprocket is rotatably supported at the lower end, and a chain is endlessly wound around the sprocket at the upper and lower ends.
A chain rotation driving device for rotating the chain is provided at the bottom of the leader, and the excavation shafts in each row have a continuous corner on the outer surface from the upper end to the lower end, are hollow, and have a plurality of shafts. It is formed by a shaft that can be connected in sequence and a bit located at the bottom, and is open at the top end and bottom, and has a top and bottom part at the bottom of the leader that has the same cross-sectional shape as the shaft. An endless fitting cylindrical body is rotatably provided via a bearing and is slidably fitted to the shaft endlessly in the vertical direction through a fitting hole penetrating in the direction, and a motor rotationally drives the endless fitting cylindrical body. A plurality of excavation shaft rotation drive devices with adjustable intervals that apply rotational force to any part of the shaft of each row are installed in parallel, and above each excavation shaft rotation drive device is common to the leader and the chain. The rotation of this chain unitically moves up and down a plurality of excavation shaft pressure input devices whose intervals are adjustable, which apply a pressing force to the upper ends of the excavation shafts in each row through bearings. This excavation shaft pressure input action unit device is provided with a swivel joint for injecting a liquid solidification agent from an external supply pipe into the upper end opening of the hollow excavation shaft which is rotatably driven. It has a configuration characterized in that a pressure pump for pumping the liquid solidifying agent is connected to the supply pipe,
Then, while the excavation shaft is rotationally driven by the excavation shaft rotation drive device, the excavation shaft is slid with respect to the excavation shaft rotation drive device and inserted into the ground.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

As shown in FIG. 1, a support arm 3 as an upper support member and a pair of hydraulic cylinders 4 as a lower support member protrude from a swivel base 2 of a base machine 1 consisting of the main body of a power shovel, etc.
A leader 6 for guiding the vertical movement of the excavation shaft 5 is erected and supported. The support arm 3 is rotated in the vertical direction by a hydraulic cylinder 7.

The support arm 3 is formed so that an upper part 3a and a lower part 3b can be divided into two at the center, and are integrated by two shafts 8 and 9. Therefore, by removing one shaft 8 and using the other shaft 9 as a fulcrum, the upper part 3a is connected to the lower part 3.
It is possible to shorten the support arm 3 by folding it to the back of the lower part 3b, and in that case, the hole in the shaft 8 of the lower part 3b can be used to support a short leader of about 5 m, for example. For example, even if there is a height restriction, it can be accommodated.

Furthermore, as shown in FIG. 1, a leader vertical slide device 11 is provided on the right side of the leader 6. This fixes guide rails 12 and 13 to the upper and lower parts of the leader 6, and
Sliders 14 and 15 are fitted into the sliders 2 and 13 so as to be able to move up and down, and the sliders 14 and 15 are integrally connected by a connecting rod 16, and the cylinder body of the hydraulic cylinder 18 is attached to a bracket 17 fixed to the upper part of the leader. At the same time, the piston rod 19 is connected to the upper slider 14, and a leader orientation variable device 20 (described later) which is pivoted to the upper end of the support arm 3 is connected to the upper slider 14. The pair of hydraulic cylinders 4 are connected to the slider 15 of the hydraulic cylinder 18. When the piston rod 19 of the hydraulic cylinder 18 is pushed out against the sliders 14 and 15 supported in a fixed position by the support arm 3, the hydraulic cylinder 18 The leader 6 on the cylinder body side rises vertically, and the base machine 1 can be moved in this state. Further, the leader 6 can be vertically lowered by reverse cylinder operation, and the leader 6 can be grounded at an accurate position.

Further, as shown in FIG. 1, the excavation shaft 5 provided along the leader 6 has a square hollow shaft 21 made of hexagonal pipes to which a plurality of pipes can be connected in sequence.
and a bit 22 located at the bottom, and the discharge port 23 is opened at the top and bottom. In addition, the shaft 2 of the excavation shaft 5 is located at the bottom of the guide rod portion 24 provided on the left side of the leader 6.
An endless reducer 25, which serves as an excavation shaft rotation drive device that is slidably fitted to the shaft 1 and the endless shaft 21 in the vertical direction and provides rotational force to any part of the shaft 21, is fixed in a vertically adjustable manner. Above the machine 25, on the guide rod portion 24 of the leader 6, an excavation shaft press-in force acting device (hereinafter simply referred to as a press-fitting device) 26 is provided, which is movable up and down, for applying a pressing force to the upper end of the rotated excavation shaft 5. A vertical movement mechanism 27 for forcibly moving this press-fitting device 26 up and down is provided along the leader 6.

This vertical movement mechanism 27 rotatably supports sprockets 28 and 29 at the upper and lower ends of the leader 6, and an endless double roller chain 30 connected to the press-fitting device 26 is connected to the sprockets 28 and 29. A chain rotation driving device 31 for rotating the chain 30 is provided at the lower part of the leader 6. This device 31 includes a hydraulic motor 3
2, which is a speed reducer driven by a transmission mechanism 33.
A rotational force that can be selected in forward and reverse directions is applied to the drive shaft of the sprocket 29 at the lower end of the leader.

As shown in FIG. 2, the endless reducer 2
5, three units are installed in parallel on a common pedestal 36. The endless reducer 25a in the center is fixed to the center of the pedestal 36 with bolts 37, and the endless reducers 25b and 25c on both sides slide along guides 38 provided on the pedestal 36 to connect to the center endless reducer 25a. The distance is adjusted and fixed at the adjusted position using the pin 39. And these three endless reducers 25a, 25b, 25c
Three excavation shafts 5 are inserted through the holes.

As shown in FIG. 3, the guides 38 of the endless reducers 25b and 25c on both sides are provided on both sides of the frame 36, and insertion holes 40 for the pins 39 are bored at predetermined pitches. A fixing position using the pin 39 is selected from among the many insertion holes 40. The mount 36 is vertically movably fitted to the guide rod portion 24 of the leader 6 via a pair of brackets 41, and the mount 36 connects a pulley (not shown) at the upper end of the leader from the winding drum of the base machine 1. After the vertical movement is adjusted by a wire (not shown) hanging down through the wire, it is supported in a fixed position by this wire. As shown in FIG. 3, each of the endless reducers 25a, 25b, and 25c has a regular hexagonal fitting that has the same cross-sectional shape as the hexagonal hollow shaft 21 of the excavation shaft 5 and penetrates in the vertical direction. The endless fitting cylindrical body 4 has an endless fitting cylindrical body 43 that is slidably fitted to the hexagonal hollow shaft 21 in an endless vertical direction through a mating hole 42.
It has a hydraulic motor 44 that rotationally drives 3.

As shown in FIG. 4, the endless fitting cylinder 43 is connected to the casing main body 4 through upper and lower bearings 46 held by upper and lower pressing plates 45.
A large-diameter gear 50 is integrally provided within the casing body 47 and meshes with a small-diameter gear 49 of the shaft 48 of the hydraulic motor 44. The hexagonal shaft 21 inserted into the endless fitting cylinder 43 penetrates downward through the hollow portion 51 of the pedestal 36. The guide 38 on the frame 36 and the lower slide plate 52 of the casing body 47 are easily slidably fitted together through a slide surface 53 made of grease or the like, and are fixed by the pin 39 inserted therethrough. The endless reducer 25a in the center is fixed with bolts.

As shown in FIG. 5, the chain 30 is connected between a pair of slide brackets 58 via a connection piece 56 that constitutes a part of the chain 30 and a connection pin 57 inserted therethrough. is formed by rotatably supporting a roller 59 that fits into the guide rod portion 24 of the leader, and is movable up and down along the guide rod portion 24, and supports the top and bottom of a pedestal 60 for supporting the press-fitting device 26. The mounting portions 61 of the two are bolted together and integrated.

As shown in FIG. 6, three of the press-fitting devices 26 are installed in parallel on the pedestal 60, similar to the endless reducer 25, and the central press-fitting device 26a is connected to the center of the pedestal 60 by a plurality of pins 62. fixed to the
The press-fitting devices 26b and 26c on both sides are connected to the frame 60.
The spacing of the central press-fitting device 26a is adjusted by sliding it laterally along a guide (not shown) provided in the center, and the plurality of pins 6
Fix by 3. Note that this press-fitting device 26b, 2
The interval adjustment guide 6c is formed by providing guides such as the guides 38 shown in FIG. 4 at the upper and lower parts of the pedestal 60, respectively.

Returning to FIG. 5, the press-fitting device 26 rotatably supports a swivel shaft 67 by upper and lower tapered roller bearings 66 that are fitted into the upper and lower parts of the main body casing 64 and held by upper and lower pressing plates 65. , a swivel joint 68 is provided at the top of this swivel shaft 67. This swivel joint 68 rotatably fits the upper part of the swivel shaft 67 via the grease supply surface 71 into the lower part of the joint body 70 which is elastically supported by a plurality of springs 69, and 7
Attach the non-rotating side pipe connection part 72 to the upper part of the gasket 7.
3 to connect the inner hole 74 of the swivel shaft 67 and the inner hole 75 of the pipe connecting portion 72 to communicate with each other. The pipe connecting portion 72 is formed by a disk 7 supported by a plurality of rib-like members 76 fixed on an upper presser plate 65.
External supply pipe 7 is bolted to 7 and is used to supply cement milk as a liquid solidifying agent or compressed air to the upper end opening of the excavation shaft 5 through the swivel shaft 67.
8 is connected to this pipe connection part 72. In addition, grease is supplied from a grease nipple 79 into the main body casing 64 to ensure smooth operation of the bearing 66, and an oil seal 80 is fitted between the upper and lower bearing holding plates 65 and the swivel shaft 67 to prevent grease. Prevent external leakage. Further, the upper part of the hexagonal hollow shaft 21 is fitted into the lower part of the swivel shaft 67, and the connecting pin 82 is inserted into the pair of pin insertion grooves 81 on the fitting surface, and the hexagonal hollow shaft 21 and the swivel shaft 67 are connected. to integrate. The press-fitting device 26 shown in FIG. 5 is fixed to the center of the pedestal 60 by the pin 62.

As shown in FIG. 6, the leader orientation variable device 20 includes a support arm-side member 86 rotatably attached to the upper end of the support arm 3 via a horizontal shaft 85.
and a leader side member 88 which is rotatably attached to the upper slider 14 via a horizontal shaft 87, and are rotatably connected via a vertical pivot shaft 89.
Cylinder mounting brackets 90, 91 are provided protruding from the side surfaces of both members 86, 88, and a hydraulic cylinder 92 is interposed between these two brackets 90, 91.

Then, by moving the piston rod 93 of the hydraulic cylinder 92 back and forth, the leader 6 can be rotated about the pivot shaft 89 within a range of ±45 degrees from the neutral position, and the direction of the leader 6 can be changed. . For example, as shown in FIG.
The support arm 3 protruding from the wall is oblique to the wall surface 94 when viewed from above, but by variable adjustment of the direction of the leader 6 around the pivot shaft 89, the support arm 3 is attached to the three press-fitting devices 26 and its lower part. The three endless speed reducers 25 located in the wall can be arranged to face each other in parallel. After changing the direction of the leader 6 in this manner, it is necessary to adjust the pair of hydraulic cylinders 4 that support the lower part of the leader in a figure-of-eight shape to maintain the verticality of the leader 6.

As shown in FIG. 8, the three excavation shafts 5 are
The shafts 5 are rotatably held by a pair of connecting plates 95 which are fitted from both sides and fixed with bolts to form a skewered dumpling shape, thereby maintaining a constant spacing between the respective shafts 5. When adjusting the interval between each shaft 5, use the connecting plate 95.
Remove and replace with a suitable connecting plate. In addition, the stirring blades 96 provided above the bit 22 and the connecting plate 95 are positioned such that the central excavation shaft is shifted downward from those of the excavation shafts on both sides. This is to prevent adjacent bits 22 and stirring blades 96 from colliding because they have overlapping diameters. Note that the stirring blade 96 is provided to stir soil and cement milk as a liquid solidifying agent in the soil construction method. Further, below the connecting plate 95, cement milk is attached to each shaft 5.
The discharge port 23 for discharging compressed air or the like is opened, and the inner hole of the hexagonal hollow shaft 21 is communicated with the discharge port 23. Further, the above-mentioned hexagonal hollow shaft 21 is capable of connecting a plurality of shafts in sequence, and in the connecting portion 97 of each shaft 21, a packing 98 is interposed between the inner holes, and a continuous uneven joint portion is formed on the outer peripheral surface. 99 and inserting pins 100 into the upper and lower double fitting portions to connect and fix each shaft 21. Then, by sequentially adding separate hexagonal hollow shafts between the hexagonal hollow shaft 21 at the top of each excavation shaft 5 and the hexagonal hollow shaft 21 below, the total length of the excavation shaft 5 can theoretically be Shaft 2 at the top can be made endlessly long.
The lower part of 1 and below can be inserted into the ground. The uppermost hexagonal hollow shaft 21 has a connecting portion 10 that fits into the lower outer peripheral surface of the swivel shaft 67 of the press-fitting device 26.
1, and a connecting pin 82 is inserted between the fitting surfaces as shown in FIG.

Returning to FIG. 1, the base machine 1 is detachably equipped with a pressure pump 102 for supplying cement milk, compressed air, etc. to the swivel joint 68 of the press-in device 26 via the external supply pipe 78. , this pump 102 is driven by a hydraulic motor. Note that this pump 102 may be used by lowering it onto the ground.

Furthermore, all of the above-mentioned hydraulic cylinders and hydraulic motors are each connected to a hydraulic power source built into the base machine 1, and the hydraulic pressure of this hydraulic power source drives the hydraulic cylinders to expand and contract, and rotates the hydraulic motor in forward and reverse directions. No external power source is required.

Next, the action will be explained.

Before installing the excavation shaft 5, adjust the movement of the endless reducers 25b, 25c on both sides according to the diameter of the bit 22, and adjust the speed of each endless reducer 25a, 25.
b, 25c, and move and adjust the press-fitting devices 26b, 26c on both sides to adjust the spacing between each press-fitting device 26a, 26b, 26c,
These three sets of upper and lower corresponding press-fitting devices 26
a, 26b, 26c and endless reducer 25a,
Three excavation shafts 5 are attached to 25b and 25c, respectively.

And three endless reducers 2 in fixed positions at the bottom
5, the hydraulic motor 44 drives the deceleration gear 4.
By rotating the endless fitting cylindrical body 43 through the hexagonal hole 42 of the cylindrical body 43, the hexagonal hollow shaft 21 of the excavation shaft 5 which is fitted into the hexagonal hole 42 of this cylindrical body 43 is rotated, and the lower end of the leader is rotated. The chain 30 is rotated by the chain rotation drive device 31, and the three press-fitting devices 26 connected to the chain 30 are driven downward along the leader 6, and the tapered roller bearings 66 in the press-fitting devices 26 are rotated. Each of the rotating excavation shafts 5 is forcibly pushed down through the shaft, and is press-fitted into the ground while sliding against the endless fitting cylinder 43 of the endless reducer 25.

At the same time, cement milk as a liquid solidifying agent and compressed air are simultaneously supplied to the swivel joint 66 of each press-fitting device 26 through three external supply pipes 78 by the pressure pump 102, and the compressed air is supplied to the swivel shaft 67. The cement milk or the like is discharged from the discharge port 23 through the inner hole 74 of the excavation shaft 5 and the inner hole of the excavation shaft 5, and is injected into the soil excavated by the bit 22. At this time, the cement milk is spread to every corner of the excavated soil by the pressurizing action of compressed air. This cement milk is homogeneously mixed with the excavated pulverized soil by the stirring action of stirring blades 96, etc.
It solidifies after a predetermined period of time and is used to improve soft ground, form continuous walls underground, etc.

The three excavation shafts 5 may rotate at the same speed or may rotate at different speeds. For example, it is conceivable that the excavation shaft at the side where the earth pressure resistance is high is driven at high speed by the endless reducer 25b fitted thereto, and the excavation shaft at the central part where the earth pressure resistance is low is driven at a low speed. Further, the press-in speed of these three excavation shafts 5 and the cement milk supply flow rate are linked.
This can be easily done by connecting the hydraulic motor 32 of the chain circulation drive device 31 and the hydraulic motor of the pressure pump 102 in series to a common hydraulic power source of the base machine.

After the excavation shaft 5 is press-fitted until the press-fitting device 26 approaches the endless reducer 25, the hexagonal hollow shaft 21 at the top and the hexagonal hollow shaft 21 below are separated, and the press-fitting device 26 is inserted into the leader. It is pulled up to the upper part, and a separate hexagonal hollow shaft is inserted and connected between the separated shafts 21, 21. By pulling down the press-fitting device 26 again, the bit 22 can be inserted deeper into the ground. By sequentially adding hexagonal hollow shafts to the intermediate portion in this way, the three excavation shafts 5 can be made as long as desired.

Note that the fixed position support of the frame 36 of the endless reducer 25 is released, and the frame 36 of the endless reducer 25 is integrally connected to the lower side of the frame 60 of the press-fitting device 26.
If both are moved up and down integrally by the chain 30, the auger screw can be press-fitted into the ground while applying a rotational force to the upper part of the auger screw as an excavation shaft. In that case, if three auger screws overlap, three
It is necessary to rotate the two endless reducers 25 at the same speed.

Further, the hollow shaft 21 of the excavation shaft 5 in each row is 6
Although it is formed from a square pipe, it is not limited thereto, and any hollow elongated member having a continuous corner on the outer surface from the upper end to the lower end may be used, such as a square pipe, a pentagonal pipe, or even a continuous pipe. It may have a spline-shaped outer shape in that it has corners.

〔Effect of the invention〕

According to the present invention, at the lower part of the leader, there are a plurality of adjustable-spacing units which are slidably fitted in the vertical direction endlessly with the shafts of the plurality of rows of excavation shafts and which apply rotational force to any part of the shafts in each row. A plurality of machines with adjustable intervals are provided with excavation shaft rotation drive devices arranged in parallel, and above each excavation shaft rotation drive device apply a pushing force to the above-mentioned leader via a bearing to the upper end of each of the rotated excavation shafts. The excavation shaft pressure input device is integrally movable up and down, and an endless chain is installed along the leader to force each excavation shaft pressure input device to move up and down. When press-fitting into the machine, the excavation shaft rotation drive device does not need to descend from the top of the leader together with the excavation shaft press-in force device, and continuously rotates the descending excavation shaft at a fixed position at the bottom of the leader. can. This excavation shaft rotation drive device has a reducer structure and is heavy due to its function of rotating the excavation shaft, but since this excavation shaft rotation drive device can be installed at the bottom of the leader, it has great stability and Between the excavation shaft rotation drive device and the excavation shaft pressure input device, the shafts of the excavation shafts can be successively added according to the depth of insertion into the ground, and thus a large-diameter excavation shaft rotation drive device can be used. The above-mentioned replenishment work can be easily performed without any obstacles, the reader can be made smaller, and this type of construction can be performed even when there is a height restriction. Furthermore, the endless chain provided along the leader allows the excavation shaft to be forced into the ground without vibration or noise, which is efficient. In addition, the plurality of excavation shaft rotation drive devices and the plurality of excavation shaft pressure input action unit devices are each
Since the interval is adjustable, the diameter of the bit located at the bottom of the excavation axis can be easily changed by adjusting the distance between each excavation axis. In addition, the excavation shaft is formed hollow and has an open top end and a bottom end,
The excavation shaft pressure input action unit device is provided with a swivel joint for injecting liquid solidification agent from an external supply pipe to the upper end opening of the excavation shaft, and a swivel joint for injecting liquid solidification agent into the external supply pipe. Since the pump is connected, a liquid solidifying agent can be mixed into the excavated soil while excavating with the excavation shaft, and solidified piles can be formed in the ground after a certain period of time, and furthermore, this pile can be installed continuously. It is possible to form continuous walls underground. In addition, if the chain circulation drive device and pressure pump are driven by a hydraulic motor connected to a common hydraulic power source of the base machine, the press-in speed of the excavation shaft by the chain and the supply of liquid solidifying agent by the pressure pump can be adjusted. The flow rate can be easily controlled in conjunction with the flow rate. In addition, if the upper support member protruding from the base machine can be shortened, the rotary drive device for the excavation shaft is separated from the press force acting device and installed at the bottom of the leader, making the leader more compact. and can accommodate height restrictions.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the excavator of the present invention, FIG. 2 is a front view of its excavation shaft rotation drive device,
Fig. 3 is a plan view thereof, Fig. 4 is a sectional view taken along the - line in Fig. 3, Fig. 5 is a sectional view of the excavation shaft press-in force acting unit, Fig. 6 is a plan view of the peripheral area of the leader, and Fig. 7 8 is a plan view showing an example of use of the variable leader orientation device, and FIG. 8 is a front view of the excavation shaft. DESCRIPTION OF SYMBOLS 1... Base machine, 3... Support arm as an upper support member, 4... Hydraulic cylinder as a lower support member, 5... Excavation shaft, 6... Leader, 21
... Shaft, 22 ... Bit, 25 ... Endless reducer as excavation shaft rotation drive device, 26 ...
...Drilling shaft press-in action unit device (press-in device), 28,
29... Sprocket, 30... Chain, 31...
... Chain circulation drive device, 42 ... Fitting hole, 43
... Endless fitting cylinder, 44 ... Motor, 46
... Bearing, 60 ... Frame, 66 ... Bearing, 68 ... Swivel joint, 78 ... External supply pipe, 102 ... Pressure pump.

Claims (1)

[Claims] 1. A leader for guiding the vertical movement of a plurality of rows of excavation shafts is erected and supported by an upper support member and a lower support member protruding from the base machine, and the upper end of the leader and A sprocket is rotatably supported at the lower end, a chain is endlessly wound around the sprocket at the upper end and the lower end, and a chain rotation drive device for driving the chain to rotate is provided at the bottom of the leader. The excavation shafts in each row are formed by a hollow shaft having a continuous corner portion on the outer surface from the upper end to the lower end and capable of sequentially connecting a plurality of shafts, and a bit located at the bottom. Also, the uppermost end and the lower part are open, and the leader is slidable endlessly in the vertical direction with the shaft through a fitting hole in the lower part of the leader that has the same cross-sectional shape as the outer shape of the shaft and penetrates in the vertical direction. An endless fitting cylinder that fits into the shaft is rotatably provided via a bearing, and the endless fitting cylinder is rotatably driven by a motor, and the interval can be adjusted to apply rotational force to any part of the shaft in each row. A plurality of excavation shaft rotation drive devices are arranged in parallel, and above each of the excavation shaft rotation drive devices is connected to the leader through a common frame to the chain, and the rotation of this chain causes the excavation shafts of each row to be connected to the leader. A plurality of excavation shaft press force input device devices are integrally movable up and down, the intervals of which can be adjusted to apply a pressing force through bearings at the upper end, and the excavation shaft press force input device devices are driven to rotate as described above. A swivel joint for injecting a liquid solidification agent from an external supply pipe is provided to the upper end opening of the hollow excavation shaft, and a pressure pump for pumping the liquid solidification agent is connected to the external supply pipe. Multi-axis press-fit excavator. 2. The chain circulation drive device and pressure pump are:
The multi-spindle press-fit excavator according to claim 1, characterized in that it is driven by a hydraulic motor connected to a common hydraulic power source of the base machine. 3 The upper support member protruding from the base machine is
A multi-spindle press-in excavator according to claim 1, which is capable of being shortened.