JP2990236B2 - Underground wall excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground continuous wall excavator which drives an electric motor and drives an excavating cutter via hydraulic power transmission means, and more particularly to a rectangular cross section suitable for constructing an underground continuous wall. The present invention relates to an underground diaphragm excavator for excavating a slot.

[0002]

2. Description of the Related Art The use of underground continuous walls includes underground structural walls, rigid foundations such as high-rise buildings, water-blocking structural walls in landfills, and underground structures replacing caissons. When constructing an underground continuous wall, in order to prevent collapse and the like, a continuous excavator excavates a wall-shaped slot in the ground while filling the excavation slot with special muddy water. Next, a steel frame was built in the excavated slot,
A one-element wall is formed by casting concrete from the ground. By connecting such walls, a continuous wall body is constructed underground as a whole.

As an example, a slot excavator is disclosed in Japanese Patent Publication No. 4-54.
No. 006 and Japanese Patent Publication No. 5-51731, a cutter unit having a pair of drum cutters at the lower end of an excavator body and two ring cutters arranged between the pair of drum cutters is provided. They are arranged in parallel. Then, a slot is excavated in the ground by lowering the apparatus body while rotating the two cutter units in opposite directions.

As shown in FIG. 6, this excavator is provided with electric motors 10 and 10 in an excavator body, and an electric motor 1 is provided.
The rotational forces of 0 and 10 are transmitted to the pair of drum cutters 14 and 14 via the reduction gears 12 and 12. Then, the rotational force transmitted to the pair of drum cutters 14 is transmitted to the two ring cutters 16. Thereby, a pair of drum cutters 14 and 14 and two ring cutters 1
6, 16 rotate.

[0005] As another slot drilling machine, a plurality of rotary shafts are vertically rotatably disposed, and a drill bit is provided at the tip of each rotary shaft. One with a cutter is known. In this slot excavator, the rotational force of the electric motor is transmitted to the rotating shaft via a gear.

[0006]

However, in the conventional slot machine, since the electric motor, the gear reduction device and the cutter are directly connected to each other and rotate at a constant speed, the slot machine excavates the slot. When excavation is performed in a different stratum, there is a problem that the rotational speed of the cutter cannot be changed corresponding to each stratum in order to prevent a sudden load change.
When an inverter or the like is provided to control the rotation speed,
There is a problem that starting torque cannot be obtained.

On the other hand, there is a slot excavator that transmits the rotational force of a hydraulic motor to an excavating cutter via a reduction gear. That is, in this excavator, a hydraulic unit is arranged on the ground, and the hydraulic unit is rotated and the hydraulic pressure discharged from the hydraulic pump is applied to a hydraulic motor disposed on the excavator body via a hydraulic hose from the ground. To supply. As a result, the hydraulic motor rotates and its rotational force is transmitted to the excavating cutter via the reduction gear.

[0008] In this slot excavator, since the hydraulic unit is arranged on the ground, there is a problem that the noise of the hydraulic unit such as the electric motor and the hydraulic pump is loud, and a complaint is generated in nighttime work. Also, since the hydraulic unit is arranged on the ground and the hydraulic motor is provided on the excavator body, the hydraulic unit on the ground and the hydraulic motor on the underground excavator body are suspended by being communicated with a number of hydraulic hoses. ing. These many hydraulic hoses have a sufficient length in consideration of the excavation depth of the excavator. Thus, for example, a depth of 150
In the case of m, the length of the hydraulic hose becomes about 200 m, and there is a problem that a loss occurs in the hose line due to the pipeline resistance. Another problem is that the hydraulic hose is cut during excavation.

Further, since the hydraulic pump on the ground and the hydraulic motor of the excavator body are communicated by a large number of hydraulic hoses, a multiple hydraulic hydraulic system for extracting or unwinding a large number of hydraulic hoses in accordance with the excavation depth. There is a problem that a hose reel is required and the structure of the slot excavator becomes complicated. The present invention has been made in view of such circumstances, and efficiently excavates underground by changing the number of revolutions of a drilling cutter, reduces noise, and eliminates hose line loss due to pipeline resistance and the like. Another object of the present invention is to provide an underground continuous wall excavator capable of simplifying the structure.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a ground excavation machine in which an excavator body suspended from the ground by a wire rope is lowered into an excavation hole filled with muddy water. In an intermediate-wall excavator, a hydraulic device such as an excavating cutter rotatably supported by an excavator body, an electric motor provided in the excavating body, and a hydraulic pump and a hydraulic motor provided in the excavating body. And a gear case in which a gear group is accommodated, and the hydraulic motor is rotated by hydraulic pressure discharged from the hydraulic pump connected to the electric motor, and the rotational force of the hydraulic motor is changed to a gear group in the gear case. Hydraulic power transmission means for transmitting to the excavating cutter via
A water pressure balance device for equalizing an internal pressure and an external pressure in the gear case.

According to the present invention, in order to achieve the above object, a control device is provided in the excavator body, and the hydraulic power transmission means is controlled via the control device based on a signal remotely operated from the ground. Further, the present invention is characterized in that the number of revolutions, the rotating force or the rotating direction of the excavating cutter is made variable.

[0012]

According to the present invention, an excavator body is provided with an electric motor, and a hydraulic power transmission means having a hydraulic device such as a hydraulic pump and a hydraulic motor is provided in the excavator body. And
The hydraulic motor is rotated by hydraulic pressure discharged from a hydraulic pump connected to the electric motor, and the excavating cutter is driven by the rotational force of the hydraulic motor.

Thus, by mounting the electric motor and the hydraulic power transmission means on the excavator main body, the hydraulic power transmission means enters the underground muddy water together with the excavator main body. Also, since the hydraulic motor and hydraulic pump were provided on the excavator body,
A large number of hydraulic hoses for communicating the ground-level hydraulic pump with the hydraulic motor of the excavator body and the like are not required, and a hydraulic hose reel for guiding the hydraulic hose is not required.

Further, from the ground, it is only necessary to connect the electric motor driving cable and the control cable to the excavator body, so that the configuration is simplified. Further, the hydraulic power transmission means adjusts the discharge amount of the hydraulic pump based on a signal remotely operated from the ground to change the number of revolutions, the rotational force and the rotational direction of the hydraulic motor. Thus, the rotation of the excavating cutter can be easily controlled from the ground.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an underground diaphragm excavator according to the present invention; FIG. 1 is a front view of an underground continuous wall excavator 30 according to the present invention, and FIGS. 2 and 3 are a block diagram showing a power transmission system and a diagram showing a hydraulic circuit of a hydraulic power transmission system, respectively. As shown in FIG. 1, the underground continuous wall excavator 30 has an excavator body 32 formed in a substantially rectangular shape, and a suspension cylinder 24 is attached to the center of the excavator body 32. Rod 24 of hanging cylinder 24
A hanging member 26 is attached to the upper end of A, and the hanging member 26 is suspended via a running block 28 by a crane (not shown) on the ground. Therefore, the suspension cylinder 24
By operating the, the excavator body 32 can be lowered at a constant speed to a low speed.

The excavator body 32 has excavating means 33A and 33B on the left and right sides of the suspension cylinder 24, respectively. Since the excavating means 33A and 33B have the same configuration, the excavating means 33A on the left will be described below, and the excavating means 33B on the right will be described.
Is omitted. As shown in FIG. 2, the excavating means 33A on the left side includes an electric motor 34, a hydraulic power transmitting means 35, reduction gears 39A and 39B, and an excavating cutter 43. The electric motor 34 is mounted on the upper part of the excavator body 32 and is covered with a cover 44. An outlet box 46 is attached to the cover 44, and a cable 48 extended from a control panel (not shown) disposed on the ground via a cable reel is electrically connected to the outlet box 46. The cable 48 is electrically connected to the electric motor 34 via the outlet box 46. Therefore, when the start button on the operation panel is pressed, the electric motor 34 is driven.

As shown in FIG. 3, the electric motor 34 is provided with a cooler line 37. That is, by driving the water pump 37A of the cooler line 37, the water used for cooling the electric motor 34 is cooled.
The water circulated to B and cooled by the cooler 37B is circulated to the electric motor 34 to cool the electric motor 34. The cooler 37B is, for example, a pipe-shaped one that covers the reverse pipe 102, and can be cooled using circulating water for discharging soil. This is provided to prevent the electric motor from generating heat when sediment or the like contained in the drilling mud precipitates and adheres to the electric motor.

A hydraulic power transmission means 35 is provided below the electric motor 34, and the hydraulic power transmission means 35 includes a hydraulic pump 36 and hydraulic motors 38A and 38B. The hydraulic pump 36 is connected to the electric motor 34. As the hydraulic pump 36, a variable displacement pump is used as shown in FIG. 3, and is connected to the charge pump 50. The hydraulic pump 36 forms a closed circuit with the hydraulic motor 38A and the hydraulic motor 38B, and the circuit is filled with hydraulic oil. The charge pump 50A is connected to a closed circuit. Accordingly, when the electric motor 34 is driven in FIG. 3, the hydraulic pump 36 and the charge pump 50 rotate, and the charge pump 50 supplementarily supplies the oil in the tank 53 into the closed circuit. The hydraulic motors 38A and 38B rotate by the driving of the electric motor.

A charge pump 50 and a control box 51
And a solenoid valve 52 such as a proportional solenoid valve disposed therein,
The solenoid valve 52 is opened and closed based on a signal from an operation panel arranged on the ground. Thereby, the charge pump 5
The oil supplied from 0 is supplied to the hydraulic pump 36 via the electromagnetic valve 52, and the discharge amount, discharge pressure or discharge direction of the hydraulic pump 36 is variably controlled. The control box 51 is attached to the excavator body 32.

As shown in FIG. 4, the hydraulic motors 38A, 38A,
8B is attached to the upper end of the gear case 56, and the excavating cutter 43 is rotatably supported by the lower end of the gear case 56. The excavating cutter 43 is a drum cutter 40A,
40B and ring cutters 42A and 42B (42 in FIG. 4).
A only, see FIG. 1). Gear case 56
Are the first, second, and third gear cases 56A, 56B, 56
The third gear case 56C has a pair of rotating shafts 58A and 58B supported by a pair.

Drum cutter 4 is attached to rotating shafts 58A and 58B.
0A and 40B are fixed. Drum cutter 40A,
The inside of 40B is formed in a size that can accommodate the third gear case 56C. In addition, two rotating shafts 60A and 60B (60A in FIG. 4) are located below the rotating shafts 58A and 58B.
Only shown in FIG. 1) and the rotating shafts 60A, 60A
Ring cutters 42A and 42B are fixed to B.
A drum cutter 40A, 40B and a ring cutter 42A,
Cutting blades 62 are formed all around 42B.

A reduction gear group is rotatably supported in the gear case 56, and the rotational force of the hydraulic motor 38A is transmitted to the drum cutter 40A and the ring cutter 42A via the reduction gear group. That is, the rotational force of the hydraulic motor 38A is transmitted to the bevel gear 68 via the bevel gear 66 fixed to the hydraulic motor shaft 64, and the gears 70, 72, 74, 7
The power is transmitted to the gear 80 in the order of 6, 78. In addition, gear 8
0 is transmitted to the rotating shaft 58 via the gear 82.
A is transmitted to the gear 84 fixed to A.

As a result, the drum cutter 40A points to the arrow a.
Rotate in the direction. The rotational force of the rotating shaft 58A is transmitted through an idle gear 86 to a gear 88 fixed to the rotating shaft 60A.
Is transmitted to the drum cutter 40A.
And rotate in the same direction. On the other hand, the ring cutter 42B shown in FIG. 1 also has a gear 84 and a gear 90 (only one is shown).
Rotate through.

FIG. 5 is an explanatory view of the power transmission line shown in FIG. 4. As described above, the rotational force of the hydraulic motor 38A is transmitted via the reduction gear group in the gear case 56 to the drum cutter 40A and the ring cutter 42A. Is transmitted to As shown in FIG. 5, the rotational force of the hydraulic motor 38B is similarly transmitted to the drum cutter 40B and the ring cutter 42B via a group of reduction gears. Therefore, the rotational forces of both the hydraulic motors 38A and 38B are transmitted to the drum cutter 40 and the ring cutter 42.

Although the excavating means 33A provided on the left side of the excavator body 32 has been described above, the drum cutter 40 of the excavating means 33B provided on the right side of the excavating body 32 has been described.
A and 40B and the ring cutters 42A and 42B are similar in structure to the excavating means 33A, except that they rotate only in the direction opposite to the left excavating means 33A (see FIG. 1). FIG.
, Adjustable guides 94 are provided at the upper and lower ends of the excavator main body via hydraulic cylinders 96, 96. The hydraulic unit for the adjustable guides 94, 94 ... and an electromagnetic valve box (not shown) are mounted on the excavator body. Then, the electromagnetic valves corresponding to the respective adjustable guides 94 in the electromagnetic valve box are remotely controlled via cables from the operation panel on the ground to control the respective adjustable guides 94, 94,.
To work. By moving the hydraulic cylinders 96, 96,..., The adjustable guides 94, 94,.
Move in the direction approaching. By operating the adjustable guides 94, 94 in this manner, the attitude of the underground continuous wall excavator 30 during excavation is controlled.

An electric or hydraulically driven underwater discharging pump 100 is provided below the excavator main body 32, and a reverse pipe 102 is connected to the underwater discharging pump 100. The reverse tube 102 has a left and right drum cutter 4
0A, 40B open to the suction port 104, the discharging hose 1
The upper end is open to the ground via 05. Accordingly, the slime is discharged to the ground by operating the submersible pump 100 during excavation.

When a hydraulic drive pump is used, it can be driven by the hydraulic drive transmission means of the present invention.
Further, as shown in FIG. 1, the excavator body 32 is provided with hydraulic balance devices 110, 110... The hydraulic balance devices 110, 110 are communicated with the sealed container of the gear case 56 provided in the excavator body 32. Has been filled with lubricating oil. During the excavation, the head pressure acts on the hydraulic balance devices 110, 110..., And the head pressure of the hydraulic balance devices 110, 110... Acts on the lubricating oil of the gear case 56 via the rubber film of the hydraulic balance device. This allows
Since the internal pressure in the gear case 56 becomes the same as the external pressure (head pressure), high sealing performance of the rotating shaft can be obtained even at a deep excavation.

The operation of the thus constructed underground continuous wall excavator according to the present invention will be described. First, the excavator body 32 of the underground continuous wall excavator 30 is suspended by a ground crane via the suspension cylinder 24. Next, the start button on the operation panel is pressed to drive the electric motor 34. In this case, the water pump 35A of the cooler line 35 is driven to circulate the cooling water in the cooler line 35. Therefore,
The cooling water used to cool the electric motor 34 is a cooler 35
The cooling water circulated to B and cooled by the cooler 35B is circulated to the electric motor 34 to cool the electric motor 34.

As described above, when the electric motor 34 is driven, the hydraulic pump 36 and the charge pump 50 rotate. Oil in the closed circuit is supplied to hydraulic motors 38A and 38B by a hydraulic pump 36. As a result, the hydraulic motors 38A and 38B rotate, and the oil is returned to the hydraulic pump 3 again.
Returned to 6. When changing the number of rotations of the hydraulic motors 38A and 38B, the charge pump 5 is operated by operating the valve of the electromagnetic valve 52 based on a signal from an operation panel arranged on the ground.
The oil supplied from 0 is supplied to the hydraulic pump 36 via the electromagnetic valve 52. As a result, the discharge amount of the hydraulic pump 36 changes, and the rotation speed of the hydraulic motors 38A, 38B changes. The charge pump 50 is provided with a hydraulic motor 38A,
38B cooling and replenishing the leak amount in the closed circuit.

When the hydraulic motors 38A and 38B rotate,
The rotational force of the hydraulic motors 38A, 38B is transmitted to the drum cutters 40A, 40B and the ring cutter 42 via a reduction gear group.
A, 42B. Thereby, the drum cutter 4
0A, 40B and the ring cutters 42A, 42B rotate to excavate underground. And the drum cutters 40A, 40
B and the slime excavated by the ring cutters 42A and 42B are sucked from the suction port 104 at the tip of the reverse pipe 102 and discharged to the ground.

Further, at the time of excavation, the position of the underground continuous wall excavator 30 is deviated from a predetermined position by a position measuring device provided separately,
When the attitude of the underground wall excavator 30 is controlled, the hydraulic cylinders 96, 96 of the adjustable guides 94, 94,.
Extend to the outside of the excavator body 32 to slightly move the underground continuous wall excavator 30 by using the excavated wall as a reaction force, and to twist the right and left, front and rear inclination or rotation direction. To prevent.

When excavating underground, it is necessary to excavate a stratum such as clayey material, gravel, and bedrock, but by interposing the hydraulic transmission means, a buffering effect against a sudden load change can be obtained. In the above-described embodiment, the drum cutters 40A and 40B and the ring cutters 42A and
The case where the horizontal multi-axis cutter provided with 2B is used has been described. However, the present invention is not limited to this, and a horizontal multi-axis cutter having only a drum cutter or a vertical multi-axis cutter having other bits may be used. .

Further, the present invention is not limited to the underground continuous wall excavator as in the above embodiment, but can be applied to a down-the-hole drill equipped with an electric motor such as a circular hole excavator (round hole). In the above embodiment, the hydraulic power transmission means 35
The case where the hydraulic pump 36 and the hydraulic motor 38 are formed in a closed circuit directly connected to each other has been described. However, the present invention is not limited to this case. The same effect can be obtained by forming a general open circuit for discharging and returning from the hydraulic motor 38 to the tank.

The electric motor 34, the hydraulic pump 36,
The number of hydraulic motors 38 is appropriately arranged depending on the capacity and structure.

[0035]

As described above, according to the underground continuous wall excavator according to the present invention, by mounting the electric motor and the hydraulic power transmission means on the excavator main body, the hydraulic power transmission means is provided together with the excavator main body. Since the water enters the muddy water filled in the excavation slot, noise of the electric motor and the hydraulic power transmission means can be eliminated. Further, since a large number of hydraulic hoses for communicating the hydraulic unit on the ground with the hydraulic motor of the excavator body and the like are not required, and a hydraulic hose reel for guiding the hydraulic hoses is not required, the structure can be simplified.

According to the present invention, the hydraulic power transmission means changes the discharge amount, discharge pressure or discharge direction of the hydraulic pump based on a signal remotely operated from the ground,
Controls the number of rotations, torque or direction of the hydraulic motor.
Therefore, the rotation of the cutter for excavation can be controlled in accordance with a change in geology, so that it is possible to excavate underground efficiently.

[Brief description of the drawings]

FIG. 1 is a front view of an underground diaphragm excavator according to the present invention.

FIG. 2 is a block diagram showing a power transmission system of the underground continuous wall excavator according to the present invention.

FIG. 3 is a diagram showing a hydraulic circuit of a power transmission system of the underground continuous wall excavator according to the present invention.

FIG. 4 is a cross-sectional view of one of gear transmission lines from a hydraulic motor of the underground wall excavator according to the present invention.

FIG. 5 is an explanatory view of a power transmission line of the underground continuous wall excavator according to the present invention.

FIG. 6 is a block diagram showing a power transmission system of a conventional continuous wall excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 30 ... Underground wall excavator 32 ... Excavator main body 34 ... Electric motor 35 ... Hydraulic power transmission means 36 ... Hydraulic pump 38A, 38B ... Hydraulic motor 43 ... Drilling cutter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02F 5/02 E02F 5/08

Claims (2)

(57) [Claims] (1) suspended from the ground by a wire rope
Lower the excavator body into the digging pit filled with muddy water
In an underground wall excavator to be excavated, an excavating cutter rotatably supported by an excavator body, an electric motor provided on the excavator body, a hydraulic pump and a hydraulic motor provided on the excavator body A hydraulic device and a gear case in which a group of gears are housed. The hydraulic motor is rotated by hydraulic pressure discharged from the hydraulic pump connected to the electric motor, and the rotational force of the hydraulic motor is set in the gear case. A hydraulic power transmission means for transmitting to the excavating cutter through a gear group, and a hydraulic pressure rose for equalizing an internal pressure and an external pressure in the gear case.
Diaphragm wall excavator, characterized in that it comprises a Nsu device. 2. A control device is provided on the excavator main body, and the hydraulic power transmission means is controlled via the control device based on a signal remotely controlled from the ground, and the number of revolutions and the rotational force of the excavating cutter are controlled. The underground diaphragm excavator according to claim 1, wherein the direction of rotation is variable.