JP2621762B2 - Continuous 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 excavator for forming a continuous underground wall in the ground, and more particularly to a horizontal multi-axial continuous underground wall excavator.

[0002]

2. Description of the Related Art Conventionally, a horizontal multi-axis continuous underground wall excavator has a main body of an excavator suspended by a crane so as to be able to move up and down.
As the excavator body excavates underground, the excavator is excavated while being lowered into the excavation hole. A plurality of drive shafts are provided horizontally at the lower end of the excavator body. These drive shafts are composed of two groups. The drive shafts of each group consist of a main shaft and a plurality of ring cutter shafts, and a small-diameter ring cutter and a large-diameter ring cutter are attached to the ring cutter shaft, respectively, and both ends of the main shaft are sandwiched by both ring cutters. Drum cutters are mounted respectively. In each of the drum cutters, a number of projections for attaching a cutting blade are formed at predetermined intervals on a peripheral surface of a steel drum body, and a cutting blade is detachably attached to these projections via pins. . Similarly, in each ring cutter, a number of projections for mounting the cutting blade are formed at predetermined intervals on the peripheral surface of the steel ring main body, and the cutting blade can be detached from these projections via pins. Installed. Each drive shaft is configured to transmit a rotational drive force from an external drive motor in a direction opposite to each other for each group. Then, at the time of excavation, the excavator body is suspended by a crane in an excavation hole excavated to a predetermined depth in advance, and while supplying water, each cutter on a forward rotation side and each cutter on a reverse rotation side are driven by a drive motor. Are rotated in opposite directions, and the underground is excavated by the excavation blade to form an underground wall.

[0003] A discharge mechanism is provided above the forward rotation drum cutter and the reverse rotation drum cutter. This discharging mechanism is designed to suck and discharge the hydrated soil (slurry) excavated by the rotating cutter when the hydrated soil (slurry) excavated by the rotating cutter is carried upward from between the forward-side cutter and the reverse-side cutter. Has become. In addition, in order to protect the underground wall formed by excavation, water is supplied from outside to the inside of the borehole as necessary, or water discharged from the borehole is drained to the outside. Inside is always filled with water.

[0004]

However, since the stratum is composed of layers having specific soil properties, such as a gravel layer and a clay layer, depending on the location, when excavating underground, the conventional continuous In the middle wall excavator, when the clay layer is excavated, the clay easily adheres to the cutter blade of the cutter. The adhered clay is not easily peeled off even by centrifugal force or vibration caused by the rotation of the cutter.In particular, when the clay layer is thick, the attached clay adheres to the peripheral surface of the cutter in a layered manner and increases its thickness. And it becomes impossible to excavate. Therefore, in the above-described conventional underground wall excavator, when hitting the clay layer, when the rotational load of the drive motor for driving the cutter is detected and the idle state occurs, the excavation operation is stopped, and the excavator body is crane-mounted. And lowered it to the ground to remove the clay attached to the cutter by human power. For this reason, there is a problem that a great deal of time and labor is required for the excavation work.

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned drawbacks. It is therefore an object of the present invention to wash out the clay adhering to a cutter at the time of excavation in parallel with the excavation work, thereby preventing the clay from adhering to the cutter and performing the excavation work efficiently. The present invention provides a continuous underground wall excavator capable of performing the following.

[0006]

A continuous underground wall excavator according to the present invention comprises an excavator body suspended from a crane and capable of moving up and down, and a plurality of drive shafts provided at the lower end of the excavator body. attached, and a pair of cutter counter-rotating to each other, provided the opening between each cutter, in a continuous underground wall excavator and a discharge mechanism for discharging to the outside by sucking the water dumping by the pump, drilling The submersible pump installed on the
The cutter rotates above each cutter connected to a submersible pump
A washing nozzle disposed opposite to the direction of
A cleaning device for cleaning the cutter by discharging water in the drilling hole to the cutter by the middle pump is provided.

[0007]

In the continuous underground wall excavator according to the present invention, when the adhesion of clay to the cutter during excavation is detected, water is discharged to the cutter by the washing nozzle. The adhered clay is washed away, the drilling performance of the cutter can be continuously maintained and the drilling can be continuously performed, and the drilling efficiency is improved. Also integrated with the excavator body
The submersible pump that descends at
Pump pressure is increased because the water in the borehole is used
No need to discharge even when the excavation depth is deep, regardless of water pressure
It can be washed by the amount of water.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 is an overall side view showing the entire continuous underground wall excavator according to one embodiment of the present invention, FIG. 2 is a front view of the continuous underground wall excavator of FIG. 1, and FIGS. 1 is a partially cutaway front view and a side view showing an excavator body, and FIG. 5 is a conceptual diagram showing a cleaning system of a cleaning device. As shown in FIGS. 1 and 2, the continuous underground wall excavator 2 includes a crane 4 of a crane truck 3.
The excavator body 5 is hung up and down. Body 3A of crane 3 is formed so as to be rotatable in about a pivot center O _1, the crane 4 is tiltable crane body 3A by crane locking device 4A as well as a crane body 3A and integrally rotated Is locked in. At the rear of the crane truck main body 3A, a suspension device 7 for suspending the excavator main body 5 up and down by a wire 6 is provided. A drive motor 8 (see FIG. 5) is provided on the crane truck main body 3A, and the drive motor 8 supplies a driving force for excavation to the excavator main body 5.

As shown in FIG. 3, the excavator body 5 has a frame 10 on which two systems of drive transmission devices 11 and 12 are vertically installed.
As shown in FIG. 5, a plurality of drive shafts 13A, 13B,
13C and 14A, 14B, 14C are respectively connected. One drive system includes a drive transmission device 11 and a main shaft 1.
3A and the ring cutter shafts 13B and 13C, and the other drive system includes the drive transmission device 12, the main shaft 14A, and the ring cutter shafts 14B and 14C. The drive transmission devices 11 and 12 of these systems transmit the driving force from the drive motor 8 to the drive shafts 13A to 13C and 14A to 14C.

As shown in FIG. 3, one drive system has a large diameter ring cutter 20 mounted on the ring cutter shafts 13B and 13C.
And a small-diameter ring cutter 21 are attached to the drum cutter 2 at both ends of the main shaft 13A with the ring cutters 20 and 21 interposed therebetween, as shown in FIG.
2 and 23 are respectively attached. Similarly, as shown in FIG. 5, the other drive system also includes the respective ring cutter shafts 14B,
Large diameter and small diameter ring cutters 30 and 31 are respectively attached to 4C, and drum cutters 32 and 33 are respectively attached to both ends of the main shaft 14A with the ring cutters 30 and 31 interposed therebetween.

Each of the drum cutters 22, 23, 32, 33
As shown in FIG. 4, a large number of excavating blade mounting members 22A, 23 are provided on a peripheral surface of a steel drum main body at predetermined intervals.
A, 32A, and 33A are formed, and these digging blade attachment members 22A, 23A, 32A, and 33A are attached to the digging blades 22B, 2A, and 33A.
3B, 32B and 33B are detachably attached via pins. The large- and small-diameter ring cutters 20, 21 and 30, 31 are formed with a large number of excavating blade mounting members 20A, 21A, 30A, 31A at predetermined intervals on the outer periphery of a steel ring main body. The excavation blades 20B, 21B, 30B, 31B are detachably attached to the excavation blade attachment members 20A, 21A, 30A, 31A via pins.

Further, each of the cutters 20 to 23, 30 to 33
Ultra-high molecular weight polyethylene material having a molecular weight of 5.5 million or more is provided on the peripheral surface of the drum main body or the ring main body excluding the excavating blade mounting members 20A to 23A and 30A to 33A.
0C to 23C and 30C to 33C are lined. This polyethylene material 20C-23C, 30C-3
3C has properties of low friction, non-adhesion, and abrasion resistance.
0.22, a coefficient of kinetic friction of 0.05 to 0.10.

Drive shafts 13A, 13B, 13C of each drive system
And 14A, 14B, and 14C are configured to rotate in the opposite directions with respect to each drive system. For example, as shown in FIG. 3, the forward drive shafts 13A, 13B, 13
C is the clockwise direction, the reverse drive shaft 14A of the other drive system,
14B and 14C rotate counterclockwise. For this reason, the excavated soil excavated by the cutters 20 to 23 and 30 to 33 is mixed with the water in the excavation hole in a slurry state, is involved in the cutters 20 to 23 and 30 to 33, and is carried upward.

As shown in FIG. 3, between the forward rotation side drum cutters 22 and 23 and the reverse rotation side drum cutters 32 and 33,
A discharge device 40 is provided above. This discharging device 40
The suction passages 4 open on the inner upper surfaces of the forward rotation drum cutters 22 and 23 and the reverse rotation drum cutters 32 and 33, respectively.
1 and a submersible pump 42 that communicates with the suction passage 41 and discharges the hydrated soil sucked from the suction passage 41 to the outside through the discharge passage 43. The discharge device 40 excavates by each of the cutters 20 to 23 and 30 to 33 and is caught between the forward-side cutters 20 to 23 and the reverse-side cutters 30 to 33. By the operation of 42, the liquid is sucked from the opening of the suction passage 41 and discharged to the outside via the discharge passage 43.

By the way, as shown in FIGS. 3 and 4,
Forward rotation drum cutters 22 and 23 and reverse rotation drum cutter 3
Cleaning devices 50 and 51 are provided above the devices 2 and 33, respectively. As shown in FIG. 5, the cleaning devices 50 and 51 include submersible sand pumps 52 and 53, accumulators 54 and 55, branch passages 56 and 57, and a cleaning nozzle 56.
A, 56B and 57A, 57B. The underwater sand pumps 52 and 53 are provided inside the frame body 10 as shown in FIGS. As shown in FIG. 5, the underwater sand pumps 52 and 53 detect the load of the drive motor by the detector 70, and
3, when idle rotation of 30 to 33 is detected, the operation switch 7
1 is turned on to operate, and sucks the earth and sand in the excavation hole and sends it out to the accumulators 54 and 55. As the underwater sand pumps 52 and 53, a vibration-proof underwater sand pump that absorbs and discharges a large amount of water of about 2000 liters per minute is used. In this embodiment, as shown in FIGS. 4 and 6, two submersible sand pump units 52, 54 and 53, 55 in which a pump and an accumulator are integrated are used. The accumulators 54 and 55 accumulate the sediment water sent from the submersible sand pumps 52 and 53 to a predetermined pressure, and store the accumulated pressure in the branch passages 56 and 55.
57 respectively.

As shown in FIG. 6, washing nozzles 56A, 56B and 57A, 57B are detachably attached to the branched ends of the branch passages 56, 57, respectively. As shown in FIGS. 5 and 6, the cleaning nozzles 56A and 56B on the reverse rotation side are provided along the axial width above the drum cutters 32 and 33, and a number of nozzle openings 58 and 59 are formed. The cleaning nozzles 56A and 56B are arranged to face each other in the rotation direction of the drum cutters 32 and 33. Similarly, the cleaning nozzles 57A and 57B on the normal rotation side have a large number of nozzle ports 60 and 61 and the drum cutters 22 and 2B.
3 is provided along the axial width above the drum cutter 2.
2, 23 are arranged facing the rotation direction. The cleaning nozzles 56A, 56B and 57A, 57B
6, 57 and accumulators 54 and 55 are connected to the underwater sand pumps 52 and 53, respectively. When the submersible sand pump units 52, 54 and 53, 55 are operated, the cleaning nozzles 56A, 56B and 57A, 57B displace a large amount of earth and sand in the borehole into the drum cutter 32,
33 and 22 and 23 respectively.
The clay attached to B, 23B, 32B and 33B is washed away.

Next, the continuous underground wall excavator 2 according to the above embodiment
Will be described. Before excavation, the excavator body 5 is inserted into the excavation hole excavated to a predetermined depth by the crane 4.
Is suspended and positioned. Next, when the drive motor 8 is actuated, the cutters 20 attached to the forward rotation shafts 13A, 13B, 13C via the drive transmission devices 11, 12 respectively.
To 23 are rotated clockwise, and the cutters 3 attached to the shafts 14A, 14B, and 14C on the reverse rotation side are rotated.
0-33 are driven to rotate counterclockwise, and the excavating blade 20A-
Excavate underground with 23A, 30A-33A. The excavated soil excavated by the excavating blades 20A to 23A and 30A to 33A is mixed with the water in the excavation hole in a slurry state, and is upward from between the cutters 20 to 23 on the normal rotation side and the cutters 30 to 33 on the reverse rotation side. Carried. The slurry-like soil is sucked from the opening of the suction passage 41 by the operation of the submersible pump 42,
It is discharged outside through the discharge passage 43.

Whether or not each of the cutters 20 to 23 and 30 to 33 has hit the clay layer can be determined by visually checking the content of the slurry-like soil discharged from the discharge passage 43 or by determining whether each of the cutters 2
The load fluctuation of the drive motor 8 for driving 0 to 23 and 30 to 33 is detected by the detector 70.
When it is confirmed that the cutters 20 to 23 and 30 to 33 are excavating the clay layer, the underwater sand pumps 52 and 53 are operated. When the underwater sand pumps 52 and 53 are operated, the sediment water in the excavation hole is sucked by the underwater sand pumps 52 and 53 and accumulated at a predetermined pressure by the accumulators 54 and 55, and the cleaning nozzles 56A, 56B, 57A and 57B.
From the outer peripheral surface 20C of each of the cutters 20 to 23 and 30 to 33
Each cutter 20-23, 3 toward 23C, 30C-33C
It is emitted in the direction opposite to the rotation direction of 0 to 33. For this reason, the excavating blades 20B to 23B, 30B
Clay attached to ~ 33B is the cleaning nozzles 56A, 56B,
It is washed away by the water stream released from 57A and 57B. Moreover, since polyethylene materials 20C to 23C and 30C to 33C are lined on the peripheral surfaces of the cutters 20 to 23 and 30 to 33, the cleaning nozzle 5 is used for cleaning.
The attached clay is easily washed away by the water flow released from 6A, 56B, 57A, 57B. As described above, when the cutters 20 to 23 and 30 to 33 excavate the clay layer, the excavation can be performed while rinsing the clay attached to the cutters 20 to 23 and 30 to 33 simultaneously with the excavation.
Without interrupting the excavation work and with each cutter 20-2
3, excavation work can be performed while maintaining good excavation efficiency of 30 to 33.

In the above embodiment, each cleaning nozzle is
Each is provided along the axial width of the peripheral surface of the drum cutter, but the axial width is increased toward the ring cutter,
The water stream may also be released to the ring cutter. Also, in the above embodiment, the peripheral surface of each cutter is lined with an ultra-high molecular weight polyethylene material.
If the material is excellent in low friction, non-adhesion and wear resistance,
Of course, other materials may be used. Further, although the underwater sand pump unit is of a type in which the pump and the accumulator are integrated, it goes without saying that the pump and the accumulator may be configured separately. When the size of the excavator is increased, a hydraulic motor may be used instead of a drive motor (electric motor) for driving each cutter.

[0020]

As described above, according to the present invention, when a cutter excavates a clay layer, excavation can be performed while washing the clay attached to each cutter simultaneously with the excavation, so that the excavation operation is interrupted. The excavation work can be carried out without maintaining the excavation efficiency of the cutter satisfactorily, and the excavation time can be reduced and labor can be saved. further,
In the borehole by a submersible pump that descends integrally with the excavator body
Water is used as washing water.
After that, it can be washed.

[Brief description of the drawings]

FIG. 1 is an overall side view showing an entire continuous underground wall excavator according to an embodiment of the present invention.

FIG. 2 is a front view of the continuous underground wall excavator of FIG. 1;

FIG. 3 is a partially broken front view showing the excavator body of FIG. 1;

FIG. 4 is a side view showing the excavator body of FIG. 1;

FIG. 5 is a conceptual diagram showing a cleaning system of the cleaning device.

FIG. 6 is an explanatory diagram showing a main part of the cleaning device.

[Explanation of symbols]

2 Continuous underground wall excavator 4 Crane 5 Excavator main body 13A to 13C, 14A to 14C Drive shaft 20 to 23, 30 to 33 Cutter 20C to 23C, 30C to 33C Low friction material (polyethylene material) 40 Discharge device 42 Pump 50 , 51 Cleaning device 52, 53 Submersible pump 54, 55 Accumulator 56A, 56B, 57A, 57B Cleaning nozzle

Claims (3)

(57) [Claims] An excavator body suspended from a crane so as to be able to ascend and descend, a pair of cutters attached to a plurality of drive shafts provided at a lower end of the excavator body and rotating in opposite directions to each other; A continuous underground wall excavator provided with an opening and having a discharge mechanism for sucking and discharging water-containing soil by a pump, and a submersible pump disposed on the excavator body.
When the cutter above each cutter being connected to the water pump
A cleaning nozzle disposed opposite to the rotation direction of
A continuous underground wall excavator, comprising: a washing device for washing the cutter by discharging water in an excavation hole to the cutter using the submersible pump . 2. A cleaning device, wherein a cleaning nozzle is detachably provided.
And between the submersible pump and the washing nozzle,
The continuous underground wall excavator according to claim 1, further comprising an accumulator . 3. A continuous underground wall excavator according to claim 1 or 2, characterized in that lining the outer circumference of the cutter by a low friction material.