JPH07119474B2 - Bucket for excavation of trench for underground wall - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an excavating bucket for a trench for an underground continuous wall, and more particularly to an excavating bucket in which chopping for digging hard ground is automated.

(Prior Art) A conventional bucket for excavation of a trench for an underground wall will be described with reference to FIGS. 5 and 6.

FIG. 5 shows an overall configuration diagram. The excavation bucket indicated by reference numeral 1 is a bucket support 2 which is long in the vertical direction, and stabilizers 3 attached to the upper and lower side surfaces of the bucket support 2, respectively. 4, a clamshell 5 that is openably and closably supported at the lower end of the bucket support 2, and a hydraulic jack 6 that opens and closes the clamshell 5.

In addition, the sheave 7 attached to the upper end side of the bucket support 2
A hanging wire 8 is wound around the wire, and the wire 8 is connected to a winch of a crawler crane (not shown).

In such a conventional bucket for excavation, when excavating the excavation bucket 1 when excavating a groove for a vertical continuous wall in the ground, the clutch and brake of the winch are operated to wind the winch, or The clamshell 5 is opened / closed by rotating the hydraulic jack 6 from the driver's seat of the crawler crane.

In addition, when correcting the inclination of the excavation bucket 1 with respect to the vertical line, the hydraulic stabilizers 3 and 4 should be adjusted in and out of the wall of the trench for the underground wall while observing the inclination display meter in the driver's seat. By.

By the way, when the groove for the underground continuous wall is formed in the relatively soft ground by such an operation, the blade edge of the clamshell 5 can be obtained by simply lowering the clamshell 5 to the bottom of the underground continuous wall. The weight of the entire excavation bucket can be used to dig 5a into the bottom ground.

Therefore, if the clamshell 5 is closed by the hydraulic jack 6, the bottom ground can be easily excavated.

However, in the case of hard ground, the cutting edge 5a of the clam shell 5 cannot be cut into the ground by just lowering the excavation bucket 1 by the rewinding operation of the winch, and chopping is necessary.

Conventionally, when chopping such a ground,
As shown in FIG. 6 (a), the excavation bucket 1 is lowered until it reaches the bottom 9a of the trench 9 for the underground wall, and then the winch is operated in the wire winding direction to move the excavation bucket 1 to FIG. As shown in FIG. 6 (c), the bottom 9a is lifted by about 0.5 to 1.0 m, and then the winch clutch and brake are released to allow the excavation bucket 1 to freely fall by its own weight, as shown in FIG. 6 (c). Let the cutting edge 5a of the clamshell 5 cut into the hard ground.

Hereinafter, the work shown in FIGS. 6A to 6C is performed a plurality of times (5 to 5).
Excavate hard ground by repeating 6 times).

(Problems to be Solved by the Invention) However, in the conventional chopping system as described above, the excavation bucket 1 is lifted by a winch, and the excavation bucket 1 is opened by releasing the clutch and the brake.
By rapidly lowering, the ground is chopped on hard ground, the operation of the clutch and brake becomes complicated, the burden on the operator increases, and the excavation efficiency is greatly influenced by the good and bad chopping operations. There was a problem that individual differences among operators would occur.

The present invention has been made in view of the above points, and provides an excavation bucket for a trench for a continuous underground wall that facilitates automation of excavation including chopping and enables efficient excavation. With the goal.

(Means for Solving the Problems) The present invention will be described with reference to FIGS. 1 to 4 corresponding to the embodiments. The present invention is provided with a bucket support 11 and a side portion of the bucket support 11. In the excavation bucket having a plurality of tilt correcting stabilizers 12 and 13, the clamshell 14 that is openably and closably attached to the lower end of the bucket support 11, and the hydraulic jack 15 that opens and closes the clamshell 14, the bucket support A sheave support member 17 that is provided so as to be vertically movable on the body 11 and that supports the sheave 18 around which a hanging wire 19 is wound, and a hydraulic pressure for chopping that connects the sheave support member 17 and the bucket support body 11. Oil that causes the bucket support 11 to rise by supplying hydraulic oil to the cylinders 21 and 22 and the hydraulic cylinders 21 and 22 and that causes the hydraulic oil of the hydraulic cylinders 21 and 22 to instantaneously be discharged to cause a rapid drop. Characterized in that a control unit 23.

(Operation) When hydraulic oil is supplied from the hydraulic control means 23 to the hydraulic cylinders 21 and 22 in a state where the excavation bucket 10 is lowered to the bottom portion 27a in the underground continuous wall groove 27, the clamshell 14 is included. When the bucket support 11 rises by a predetermined amount and the hydraulic oil in the hydraulic cylinders 21 and 22 in this state is instantaneously discharged by the hydraulic control means 23, the entire bucket support 11 including the clam shell 14 rapidly drops. The edge of the clamshell 14 cuts into hard ground.

Hereinafter, by repeating this automatic chopping work, it becomes possible to excavate hard ground. Therefore, the excavation work including chopping can be easily automated, and the excavation efficiency can be improved.

Also, a stopper that regulates the upper limit position of the sheave support member 17
Providing 26 on the bucket support 11 is advantageous in that the weight of the excavation bucket 10 is not loaded on the hydraulic cylinders 21 and 22 when the excavation bucket 10 is raised and lowered.

(Example) Hereinafter, the Example of this invention is described based on drawing.

1 to 3 show an embodiment of an excavation bucket according to the present invention. FIG. 1 is an overall configuration diagram, FIG. 2 is an enlarged sectional view of an essential part, and FIG. It is sectional drawing which follows the AA line of a figure.

In the figure, an excavation bucket indicated by reference numeral 10 is roughly classified into a bucket support 11, stabilizers 12 and 13, and a clamshell 1.
4 and a hydraulic jack 15.

The bucket support body 11 includes a shell support block 11a and a frame body 11b integrally coupled to the upper end of the support block 11a.

As shown in FIGS. 2 and 3, a sheave support member 17 is slidably engaged in the left and right guide grooves 16a, 16b formed so as to face the frame 11b.

A sheave 18 for suspending a bucket is rotatably mounted inside the sheave support member 17, and a wire 19 for suspending a bucket is wound around the sheave 18.

Both ends of the wire 19 are pulled out upward through guide rollers 20a, 20b provided at the upper end of the frame body 11b, and are connected to a crawler crane (not shown) and a winch mounted thereon.

Hydraulic cylinders 21 and 22 for chopping are arranged below the sheave support member 17 inside the frame 11b.

Piston rod 2 of hydraulic cylinders 21, 22 for chopping
1a and 22a are swingably connected to the sheave support member 17, and the lower ends of the hydraulic cylinders 21 and 22 are pivotally attached to the frame body 11b side.

The hydraulic control device 23 installed on the frame 11b controls the supply and instantaneous discharge of the hydraulic oil to the hydraulic cylinders 21 and 22 for chopping, and the oil amount control that makes the contraction operation of both hydraulic cylinders 21 and 22 the same. The hydraulic control device 23 and the hydraulic cylinders 21 and 22 are connected by hydraulic hoses 24 and 25.

A stopper 26 that suspends and supports the entire excavation bucket 10 is fixed to the upper end of the frame body 11b by engaging the upper surface of the sheave support member 17.

A plurality of hydraulic upper stabilizers 12 that correct the inclination of the excavation bucket 10 are attached to the left and right sides of the upper end of the frame 11b, and further, on the left and right sides of the support block 11a,
Similarly, a plurality of hydraulic lower stabilizers 13 for correcting the inclination are attached.

The clamshell 14 is openably and closably supported by the lower end of the support block 11a, and the clamshell 14 can be opened and closed by a hydraulic jack 15 attached to the support block 11a.

The stabilizers 12, 13, the hydraulic jack 15, and the hydraulic control device 23 are supplied with hydraulic oil from a hydraulic unit on the crawler crane via a hydraulic hose (not shown).

Next, the operation of this embodiment configured as described above will be described with reference to FIG.

FIG. 4 shows the procedure of chopping work using an excavating bucket.

In the case of excavating hard ground, first, a winch (not shown) is rotated at a low speed in the wire payout direction so that the excavation bucket 10 suspended by the wire 19 is shown in FIG. 4 (A).
The blade edge of the clamshell 14 in the open state is lowered until it reaches the bottom portion 27a in the groove 27 for the underground wall, as shown in FIG.

After that, from the time when the descent of the excavation bucket 10 stopped,
Further, by continuing the feeding of the wire 19, the sheave support member 17 is moved from the stoppers 26 to 15 as shown in FIG. 4 (B).
It is lowered by about cm, and feeding of the wire 19 is stopped at this point.
This is to secure a biting margin of the shell blade edge due to chopping.

When the state shown in FIG. 4 (B) is recognized, a chopping start command is given from the ground control unit to the hydraulic control device 23.

As a result, when the hydraulic control device 23 operates, hydraulic oil is supplied to the hydraulic cylinders 21 and 22 through the hydraulic hoses 24 and 25, so that the hydraulic cylinders 21 and 22 contract.

At this time, since the piston rods 21a and 22a of the hydraulic cylinders 21 and 22 are connected to the sheave support member 17,
With the contraction operation of 21,22, the excavation bucket 10 including the bucket support 11 is raised as shown in FIG. 4 (C).

Then, when the excavating bucket 10 is lifted by several tens of centimeters with the sheave support member 17 as the center, the lifting operation is stopped.

Then, in the hydraulic control device 23, the hydraulic cylinders 21 and 22
Open the hydraulic oil supply port for
Rapidly drops in the groove 27 for the underground wall toward the bottom 27a by its own weight as shown in FIG. 4 (D).

As a result, the cutting edge 14a of the clamshell 14 is shown in FIG. 4 (E).
As shown in, it cuts into the bottom 27a of the hard ground. The bite amount of the cutting edge at this time is about 15 cm.

Hereinafter, the work shown in FIGS. 4B to 4E is repeated about 2 to 3 times.

As a result, the blade edge of the clamshell 14 is several tens of cm on the bottom 27a.
If it bites, the hydraulic jack 15 is closed at that stage to close the clamshell 14 as shown in FIG. 4 (F). At this time, the excavation operation of the clamshell 14 increases the overall length of the excavation bucket 10, so that the upper end of the excavation bucket 10 rises upward.

After the ground is excavated by chopping in this way, when the winch is rotated in the wire winding direction, the sheave support member 17 engages with the stopper 26, and the excavation bucket 10 is accompanied by this, as shown in FIG. As shown in FIG. 5, the inside of the groove 27 for the continuous underground wall is raised.

In this embodiment as described above, the bucket support 11
A pair of hydraulic cylinders 21 and 22 are connected between the bucket suspension sheave support members 17 that can be moved vertically, and the hydraulic cylinders 21 and 22 are contracted during chopping to lift the excavation bucket 10. , And hydraulic cylinder
The hydraulic oil in 21,22 is instantly discharged to cause it to fall rapidly and scrape hard ground, so it is possible to automate the chopping work of the excavation bucket 10 and the operator's burden accordingly. Is significantly reduced, the speed of chopping work can be increased, and the excavation efficiency of the trench for underground walls can be improved.

Further, when the excavation bucket 10 is raised and lowered, the sheave support member 17 engages with the stopper 26.
The weight of 10 is not loaded on the hydraulic cylinders 21 and 22.

The present invention is not limited to the configuration shown in the above embodiment,
It goes without saying that various changes can be made within the scope described in the claims.

(Effects of the Invention) As described above, according to the present invention, the sheave support member that supports the excavation bucket so that it can move up and down is attached to the bucket support body so as to be vertically movable, and the space between the sheave support member and the bucket support body is provided. Since it is connected by a hydraulic cylinder, and this hydraulic cylinder raises and rapidly drops the excavation bucket in the groove for the underground continuous wall to perform chopping of the ground, automatic cutting of the groove for the underground continuous wall including chopping is performed. This facilitates excavation, significantly reduces the load on the operator, and improves excavation efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of an essential part of this embodiment, and FIG. 4A to 4G are sectional views taken along the line, FIGS. 4A to 4G are explanatory views showing the procedure of chopping work in this embodiment, FIG. 5 is a configuration diagram of a conventional excavation bucket, and FIGS.
(C) is a diagram for explaining the operation. In the figure, 10 is an excavation bucket, 11 is a bucket support, and 1
2, 13 is a stabilizer, 14 is a clam shell, 15 is a hydraulic jack, 17 is a sheave support member, 18 is a sheave, 19 is a wire,
21 and 22 are hydraulic cylinders, 23 is a hydraulic control device, and 26 is a stopper.

Claims (2)

[Claims] 1. A bucket support, a plurality of tilt correcting stabilizers attached to the sides of the bucket support, a clam shell openably and closably attached to the lower end of the bucket support, and a hydraulic jack for opening and closing the clam shell. And a sheave support member that is provided movably up and down on the bucket support and supports a sheave around which a suspending wire is wound, and a connection between the sheave support member and the bucket support. A hydraulic cylinder for chopping, and hydraulic control means for raising the bucket support by supplying hydraulic oil to the hydraulic cylinder and for rapidly dropping the hydraulic oil from the hydraulic cylinder. A bucket for excavating a trench for an underground continuous wall, which is characterized in that 2. A bucket for excavating a groove for an underground underground wall according to claim 1, wherein a stopper for restricting an upper limit position of the sheave support member is provided on the bucket support.