JPH06341145A - Continuous underground wall excavator - Google Patents

Abstract

PURPOSE:To simultaneously wash out clay clogged in a cutter with excavating work during the excavation work to prevent the cutter from clogging of clay and efficiently carry out the excavation work. CONSTITUTION:A continuous underground wall excavator is provided with a pair of cutters 20-23, 30-33 fitted at the lower end of the excavator body and reversely rotated to each other and a washing device 50 above them. The washing device 50, 51 is provided with a submerged pump 52, 53 and washing nozzles 56A, 56B, 57A, 57B connected to the submerged pump 52, 53 through an accumulator 54, 55 and detachably arranged to be confronted with the rotary direction of the cutters 20-23, 30-33. Water is discharged from the washing nozzles 56A, 56B. 57A, 57B to the cutters 20-23, 30-33 to wash out clay clogged onto the cutters 20-23, 30-33 when excavating a clay layer. The external peripheral faces of the cutters 20-23, 30-33 are treated in a lining process with a low abrasive material.

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-axis type continuous underground wall excavator.

[0002]

2. Description of the Related Art Conventionally, a horizontal multi-axis type continuous underground wall excavator hangs the excavator body by a crane so that it can be lifted and lowered.
As the excavator body excavates the ground, the excavator descends into the excavation hole while excavating. A plurality of drive shafts are horizontally provided at the lower end of the excavator body. These drive shafts are composed of two groups. The drive shaft of each group consists of a main shaft and a plurality of ring cutter shafts.A small diameter ring cutter and a large diameter ring cutter are attached to the ring cutter shaft, and both ring cutters are sandwiched at both ends of the main shaft. Each drum cutter is installed. Each of the drum cutters has a large number of protrusions for attaching an excavating blade formed at predetermined intervals on the circumferential surface of a steel drum body, and the excavating blades are detachably attached to these protrusions via pins. . Similarly, each ring cutter also has a large number of protrusions for attaching the excavating blades formed at predetermined intervals on the circumferential surface of the steel ring body, and the excavating blades can be removed via pins on these protrusions. It is installed. Rotational driving force is transmitted to the respective drive shafts in opposite directions from the external drive motor for each group. When excavating, the excavator main body is suspended by a crane in an excavation hole previously excavated to a predetermined depth, and while supplying water, each cutter on the forward rotation side and each cutter on the reverse rotation side is driven by the drive motor. And are respectively rotated in opposite directions, and the excavating blade excavates the underground to form an underground wall.

A discharge mechanism is provided above the normal rotation side drum cutter and the reverse rotation side drum cutter. This discharging mechanism sucks and discharges the water-containing waste soil (slurry) excavated by the rotating cutter when it is carried upward from between the forward rotation side cutter and the reverse rotation side cutter. Has become. In addition, in order to protect the underground wall formed by excavation, water may be supplied from the outside into the excavation hole as needed, or the water spouted from the excavation hole may be discharged to the outside. The inside is always filled with water.

[0004]

By the way, since the stratum is composed of layers having a peculiar soil property such as a sand gravel layer and a clay layer depending on the location, when excavating the ground, the conventional continuous ground described above is used. With a medium wall excavator, when the clay layer is excavated, the clay easily adheres to the excavating blade of the cutter. The adhered clay is hard to come off due to centrifugal force or vibration due to the rotation of the cutter, and especially when the clay layer is thick, the adhered clay adheres to the peripheral surface of the cutter in layers to increase the thickness of the excavating blade. It will cover all of the ground and make excavation impossible. Therefore, in the above-mentioned conventional continuous underground wall excavator, when it hits the clay layer, when the rotational load of the drive motor that drives the cutter is detected and the idle state is reached, the excavation work is stopped and the excavator body is moved to the crane. It was lifted up by, and lowered to the ground, and the clay adhering to the cutter was scraped off manually. Therefore, there is a problem that the excavation work requires a lot of time and labor.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and the clay adhering to the cutter at the time of excavation is washed out concurrently with the excavation work to prevent the clay from adhering to the cutter and to perform the excavation work efficiently. It is intended to provide a continuous underground wall excavator capable of performing.

[0006]

A continuous underground wall excavator according to the present invention comprises an excavator main body suspended by a crane so that the excavator main body can be lifted and lowered, and a plurality of drive shafts provided at the lower end of the excavator main body. In a continuous underground wall excavator equipped with a pair of cutters that are attached to each other and rotate in opposite directions, and a discharge mechanism that is provided so as to open between the cutters and that sucks water-containing waste soil and discharges it to the outside, A cleaning device is provided above the cutter to discharge the water flow to the cutter to clean the cutter.

[0007]

In the continuous underground wall excavator according to the present invention, when the clay adheres to the cutter during excavation, the washing device discharges water to the cutter. The adhered clay is washed away, the excavation performance of the cutter can be constantly maintained to be excellent, and the excavation efficiency can be improved.

[0008]

The present invention will be described below with reference to the illustrated embodiments.
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, and FIGS. 1 is a partially cutaway front view and a side view showing the excavator main body of FIG. 1, and FIG. 5 is a conceptual diagram showing a cleaning system of the cleaning device. As shown in FIGS. 1 and 2, the continuous underground wall excavator 2 includes a crane 4 of a mobile crane 3.
The excavator body 5 is hung so that it can be raised and lowered. The main body 3A of the crane vehicle 3 is configured to be rotatable around the turning center O ₁ , and the crane 4 is integrally rotated with the crane vehicle main body 3A and can be tilted to the crane vehicle main body 3A by the crane locking device 4A. Be locked in. A suspension device 7 that suspends the excavator body 5 so that the excavator body 5 can be raised and lowered by a wire 6 is provided at the rear of the crane vehicle body 3A. A drive motor 8 (see FIG. 5) is provided on the crane vehicle 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 drive transmission devices 11 and 12 are vertically installed.
As shown in FIG. 5, the drive transmission devices 11 and 12 of these two systems have a plurality of drive shafts 13A and 13B for each system.
13C and 14A, 14B, 14C are connected, respectively. One drive system includes the drive transmission device 11 and the spindle 1.
3A and ring cutter shafts 13B and 13C, and the other drive system includes a drive transmission device 12, a main shaft 14A, and ring cutter shafts 14B and 14C. The drive transmission devices 11 and 12 of these respective systems transmit the driving force from the drive motor 8 to the drive shafts 13A to 13C and 14A to 14C.

One drive system, as shown in FIG. 3, has a large diameter ring cutter 20 on the ring cutter shafts 13B and 13C.
And a small-diameter ring cutter 21 are attached, respectively, and as shown in FIG. 4, the drum cutter 2 is sandwiched between the both ends of the main shaft 13A with the ring cutters 20 and 21 interposed therebetween.
2 and 23 are attached respectively. Similarly, for the other drive system, as shown in FIG. 5, each ring cutter shaft 14B, 1
Large-diameter and small-diameter ring cutters 30 and 31 are attached to 4C, and drum cutters 32 and 33 are attached to both ends of the main shaft 14A with the ring cutters 30 and 31 interposed therebetween.

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

Further, each cutter 20-23, 30-33
The outer peripheral surface of the drum body or ring body excluding the drilling blade mounting members 20A to 23A and 30A to 33A has an ultrahigh molecular weight polyethylene material 2 having a molecular weight of 5.5 million or more.
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 wear resistance, and in particular, the coefficient of dynamic friction is 0.07 to
The coefficient of dynamic friction is 0.22 and is 0.05 to 0.10.

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

Between the forward rotation side drum cutters 22 and 23 and the reverse rotation side drum cutters 32 and 33, as shown in FIG.
The discharging device 40 is provided above. This discharge device 40
Is the suction passage 4 which opens to the inner upper surface of each of the forward rotation side drum cutters 22 and 23 and the reverse rotation side drum cutters 32 and 33.
1 and a submersible pump 42 that communicates with the suction passage 41 and discharges the water-containing soil discharged from the suction passage 41 to the outside through the discharge passage 43. The discharge device 40 is excavated by each of the cutters 20 to 23 and 30 to 33, is wound between the forward rotation side cutters 20 to 23 and the reverse rotation side cutters 30 to 33, and pumps the water-containing waste soil conveyed upward. By the operation of 42, the air is sucked from the opening of the suction passage 41 and discharged to the outside through the discharge passage 43.

By the way, as shown in FIGS.
Forward rotation side drum cutters 22 and 23 and reverse rotation side drum cutter 3
Washing devices 50 and 51 are provided above the numbers 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 cleaning nozzles 56.
A, 56B and 57A, 57B. The submersible sand pumps 52 and 53 are provided inside the frame body 10 as shown in FIGS. 3 and 4. As shown in FIG. 5, the submersible sand pumps 52 and 53 detect the load of the drive motor by the detector 70, and the cutters 20 to 2 respectively.
When the idle rotation of 3, 30 to 33 is detected, the operation switch 7
1 is turned on to operate, and the earth and sand water in the excavation hole is sucked and sent to the accumulators 54 and 55. As the submersible sand pumps 52 and 53, vibration-resistant submersible sand pumps of a type that absorb and drain a large amount of water of about 2000 liters per minute are 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 earth and sand water sent from the submersible sand pumps 52 and 53 to a predetermined pressure, and a branch passage 56,
It is designed to release each to 57.

As shown in FIG. 6, cleaning nozzles 56A and 56B and 57A and 57B are detachably attached to the branched end portions of the branch passages 56 and 57, respectively. As shown in FIGS. 5 and 6, the reverse rotation side cleaning nozzles 56A and 56B are provided above the drum cutters 32 and 33 along the axial width, and a large 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 forward rotation side have a large number of nozzle openings 60 and 61, and the drum cutters 22 and 2 are also provided.
Provided along the axial width above the drum cutter 2
They are arranged so as to face each other in the rotation directions of 2 and 23. The cleaning nozzles 56A, 56B and 57A, 57B are connected to the branch passage 5
6, 57 and accumulators 54, 55, and are connected to submersible sand pumps 52, 53, respectively. When the submersible sand pump units 52, 54 and 53, 55 operate, the cleaning nozzles 56A, 56B and 57A, 57B remove a large amount of earth and sand water in the drill hole from the drum cutter 32,
33 and 22 and 23, respectively, to release the digging blade 22
The clay attached to B, 23B, 32B and 33B is washed away.

Next, the continuous underground wall excavator 2 according to the above embodiment.
The operation of will be described. Before excavation, the excavator main body 5 is moved by the crane 4 into the excavation hole previously excavated to a predetermined depth.
Suspend and position. Next, when the drive motor 8 is operated, the cutters 20 attached to the shafts 13A, 13B, and 13C on the forward rotation side via the drive transmission devices 11 and 12, respectively.
23 are driven to rotate clockwise, and each cutter 3 attached to each shaft 14A, 14B, 14C on the reverse rotation side.
0-33 are driven to rotate counterclockwise, and the drilling blade 20A-
Excavate the ground with 23A and 30A to 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 moved upward between the cutters 20 to 23 on the forward rotation side and the cutters 30 to 33 on the reverse rotation side. Carried. Then, 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 to the 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 is determined by visually observing the contents in the slurry-like soil discharged from the discharge passage 43 or by each cutter 2
The load fluctuation of the drive motor 8 that drives 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 submersible sand pumps 52 and 53 are operated. When the submersible sand pumps 52 and 53 are operated, the earth and sand water in the excavation hole is sucked into the submersible 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 cutter 20-23, 30-33
Cutters 20-23, 3 for 23C, 30C-33C
It is emitted in the direction opposite to the rotation direction of 0 to 33. Therefore, the excavating blades 20B to 23B and 30B when excavating the clay layer.
~ 33B clay adhered to the cleaning nozzles 56A, 56B,
It is washed away by the water flow discharged 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 can be used at the time of cleaning.
The water discharged from 6A, 56B, 57A, and 57B facilitates the adhered clay to be washed away. In this way, when each cutter 20-23, 30-33 excavates a clay layer, it is possible to perform excavation while washing away the clay adhering to each cutter 20-23, 30-33 simultaneously with excavation.
Each cutter 20-2 without interrupting the excavation work
It is possible to perform excavation work while maintaining excellent excavation efficiency of 3, 30 to 33.

In the above embodiment, each cleaning nozzle is
It is provided along the axial width of the peripheral surface of the drum cutter, but the axial width is expanded to the ring cutter side,
The water flow may be discharged also to the ring cutter. Further, in the above embodiment, the peripheral surface of each cutter is lined with a polyethylene material of ultra high molecular weight,
If the material has low friction, non-adhesion, and wear resistance,
Of course, other materials may be used. Furthermore, although the submersible sand pump unit of the type in which the pump and the accumulator are integrated is used, it goes without saying that the pump and the accumulator may be configured separately. When the size of the excavator becomes large, a hydraulic motor may be used instead of the drive motor (electric motor) as the drive source that drives each cutter.

[0020]

As described above, according to the present invention, when a cutter excavates a clay layer, the excavation work can be interrupted because the clay adhering to each cutter can be washed away simultaneously with the excavation. In addition, the excavation work of the cutter can be performed with good excavation efficiency maintained, and the excavation time can be shortened and labor can be saved.

[Brief description of 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.

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

FIG. 4 is a side view showing the excavator main 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 Codes] 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)

[Claims] 1. An excavator main body suspended from a crane so that it can be lifted and lowered, a pair of cutters attached to a plurality of drive shafts provided at the lower end of the excavator main body, and rotating in opposite directions to each other, and between each cutter. In a continuous underground wall excavator that is provided with an opening and has a discharge mechanism that sucks water-containing soil by a pump and discharges it to the outside, in a continuous underground wall excavator, a water flow is discharged to the cutter above each cutter to wash the cutter. A continuous underground wall excavator characterized by having a device. 2. The cleaning device comprises a submersible pump arranged in a drill hole, and a cleaning nozzle detachably arranged so as to be connected to the submersible pump via an accumulator so as to face the cutter in the rotating direction. The continuous underground wall excavator according to claim 1, wherein the excavator is a continuous underground wall excavator. 3. The continuous underground wall excavator according to claim 1, wherein the outer peripheral surface of the cutter is lined with a low friction material.