JP3080338B2 - Pit excavator with variable machine width - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft excavator for constructing a shaft or foundation using a casing.

[0002]

2. Description of the Related Art As a shaft excavation device for a casing foundation method, for example, an earth auger and other various types are conventionally used. Among these devices, the applicant of the present application has proposed a drilling device having excellent mobility and capable of easily excavating a shaft by a single worker as disclosed in Japanese Patent Application No. Hei 2-1.
No. 08399.

[0003] In this excavator, a boom is pivotably mounted on a wheel-traveling trolley, a rig is suspended from the tip of the boom by a wire, and the trolley swings for rocking and press-fitting and pulling a casing tube. It has a press-fitting mechanism.

[0004]

On the other hand, the usefulness of such excavators has been recognized in recent years, and they have come to be widely used especially for shafts for propulsion work such as sewerage work and underground electric wire work. Accordingly, there is a growing demand for a casing tube having a larger diameter from the viewpoint of improving workability in a shaft.

In order to respond to such a demand, it is necessary to increase the diameter of a swing press-fitting mechanism for swinging press-fitting a large-diameter casing tube. If it is a fixed type and can accommodate casing tubes with a diameter of 3 m or more, the width of the drilling rig will be widened and not only will it prevent entry into narrow sites, but also it will not be possible to transport it with ordinary trailers It becomes a big size.

Accordingly, an object of the present invention is to provide a shaft excavator which can run on a narrow road and can cope with a large-diameter casing tube.

[0007]

In order to solve the above-mentioned problems, a shaft excavator according to the present invention has a movable bogie and a boom which is connected to the bogie so as to be tiltable and suspends an excavator through a wire. And a rocking excavation device that is incorporated in the front part of the bogie and includes a rocking press-fitting mechanism that rocks and press-fits a casing tube by clamping, and the rocking press-fitting mechanism is formed to be foldable. I do.

[0008]

In the excavator according to the present invention, the swing press-fitting mechanism is made large enough to clamp the casing tube during the swing press-fitting, and the width is reduced when not in use.
It can be narrower than the machine width at the time of construction.

[0009]

1 is a side view of a shaft excavator according to the present invention, and FIG.
Is a bottom view of the same.

Reference numeral 1 denotes a bogie, and 2 denotes a swing press-fitting mechanism for a casing tube provided at a front portion of the bogie 1.
Are provided with a total of four outriggers 1a at the front end of the carriage 1 and the rear end of the carriage 1. Reference numeral 3 denotes an auxiliary outrigger, and a rear wheel 17 also serving as a driving wheel is mounted on a rear portion of the bogie 1.

The swing press-fitting mechanism 2 includes a left and right frame 4 attached to the carriage 1 and an annular swing band 5 supported by the frame 4. The frame 4 is connected to a linear portion 4a at the tip and connected to the straight portion 4a. The base portion is rotatably mounted on the side surface of the carriage 1 by a mounting pin 6. A frame cylinder 7 is provided in the middle of the inclined portion 4b.

The oscillating band 5 is supported below the frame 4 by four press-in / draw-out cylinders 8.
The two swing cylinders 9 are connected to the lower surface of the cylinder.
The press-fitting / pulling-out cylinder 8 and the oscillating cylinder 9 are both connected to each other via a universal joint. By the combined movement of the vertical movement of the press-in / draw-out cylinder 8 and the reciprocating movement of the swinging cylinder 9, the casing tube T shown in FIG.

The rocking band 5 is composed of four split rings 5a, 5b, 5c and 5d each of which is pin-connected at an end, and a cylinder 10 for tightening is provided between the split rings 5a and 5d located in front of the apparatus. Are connected via Reference numeral 11 denotes a swing band deformation cylinder provided between the split rings 5b and 5c located at the rear of the apparatus.

On the other hand, a two-stage boom 18a, 18b is attached to the carriage 1 by a cylinder 19 so as to be tiltable, as shown in FIG. The boom 18b is extendable and retractable by hydraulic drive from the base end boom 18a. A wire sheave 20 is attached to the tip of the boom 18b, and a grab bucket 21 provided with a clamp 21a and a bucket 21b is suspended by a wire 23. Wire 23 is boom 18
The grab bucket 21 can be moved up and down by being wound around a hydraulic hoist 24 provided at a. A hose 21c for supplying hydraulic pressure is connected to the grab bucket 21. The hose 21c is connected to a hose reel 2 provided on the boom 18a via a hose sheave 22 at the end of the boom.
Feeding and winding are performed by 1d.

FIGS. 3 and 4 are plan views showing the oscillating device 2 folded when not in use. FIG. 3 shows the frame 4 in a folded state, and FIG. 4 shows the oscillating band 5 in a folded state. Show.

As shown in FIG. 1, when not in use, the frame cylinder 7 is contracted and the swing band deforming cylinder 11 is extended, so that the inside of the left and right frames 4 is moved until it comes into contact with the side surface of the traveling carriage. In addition, the swing band 5 is deformed from the upper and lower joints into a bent state. The frame cylinder 7 and the swing band deforming cylinder 1
1 are linked to each other, and are performed by an operation panel (not shown).

FIG. 3 shows a front wheel unit 12 mounted on a frame 4 reduced in width for traveling. The unit 12 is a support frame 12a for supporting a front wheel 12b.
And a steering cylinder 12c for changing the direction of the front wheel 12b.

The excavating operation by the present apparatus is substantially the same as that of the conventional example. The casing tube T is suspended in the band 5 and is securely clamped by the tightening cylinder 10.
In this state, the press-fitting / pulling-out cylinder 8 is moved downward, and the swinging cylinder 9 gives the casing tube T a reciprocating turning motion. These press-fit pull-out cylinders 8
The casing tube T is press-fitted into the ground by the pressure input by the swing cylinder 9 and the reciprocating swing motion by the swing cylinder 9.

At the same time, the grab bucket 21 is lowered and fed into the casing T, and the clamp 21a is expanded in the casing to fix the grab bucket 21, and the bucket 21b excavates the earth and sand in the casing.
a is loosened and the grab bucket 21 is lifted to discharge the earth.
This is repeated to build a shaft. These operations are performed by an operator operating an operation panel (not shown) connected to the excavator. The case where the casing tube T is added to increase the depth is performed in the same manner.

When the operation is further completed, as described above, the frame cylinder 7 and the swing band deforming cylinder 11
Is operated to reduce the machine width, and further, the front wheel unit 12 is attached so as to be movable.

As described above, according to the shaft excavator of the present embodiment, it is possible to make the width of the excavator smaller than the diameter of the casing tube to be used when not in use. However, it can be transported even on a narrow road or the like and has good mobility.

FIGS. 5 to 7 show a second embodiment of the present invention.
In this embodiment, instead of the frame 4 of the first embodiment, the plane shape is a rectangular frame 15, and the frame connection cylinder 16 is a frame connection cylinder 16 that operates the U-shaped divided frames 15 a and 15 b completely synchronously. They are connected so as to expand and contract in the width direction. By extending the swing band deforming cylinder 11 similarly to the first embodiment, it is possible to change the swing band 5 from the state at the time of use in FIG. 6 to the middle bent state as shown in FIG. .

With such a structure, as in the first embodiment, it is possible to carry a casing tube having a large diameter, to be able to be transported by a general trailer, and to be able to be transported even in a narrow work site. It will be. In particular, a frame having higher rigidity than that of the first embodiment can be obtained.
In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Also in this embodiment, the vehicle can run by attaching a front wheel unit (not shown) when not in use.

[0024]

As described above, in the shaft excavator of the present invention, the swing press-fitting mechanism is formed so as to be narrower. For this reason, while being able to cope with a large-diameter casing tube, it has good mobility so that it can be transported even on a narrow road or the like.

[Brief description of the drawings]

FIG. 1 is a side view of a shaft excavator according to a first embodiment of the present invention.

FIG. 2 is a bottom view of the shaft excavator shown in FIG.

FIG. 3 is a partially omitted plan view for explaining a folded state of a frame.

FIG. 4 is a partially omitted plan view for explaining a folded state of the swing band.

FIG. 5 is a side view of a shaft excavator according to a second embodiment of the present invention.

6 is a bottom view of the shaft excavator shown in FIG.

FIG. 7 is a bottom view of the shaft excavator shown in FIG. 5 in a folded state.

[Explanation of symbols]

1 bogie, 1a outrigger, 2 swing press-fit mechanism, 3
Auxiliary outrigger, 4 frames, 4a linear portion, 4b inclined portion, 5 swing band, 5a, 5b, 5c, 5d split ring, 6 mounting shaft, 6a clamp cylinder, 7
Frame cylinder, 8 press-in / draw-out cylinder, 9 swing cylinder, 10 tightening cylinder, 11 swing band deformation cylinder, 12 front wheel unit, 15 rectangular frame, 16 connecting cylinder, 18a, 18b boom,
19 Cylinder, 20 Wire Sheave, 21 Grab Bucket (Excavator), 21a Clamp, 21b Bucket, 21c Hose, 21d Hose Reel, 22 Hose Sheave, 23 Wire, T Casing Tube

Claims (1)

(57) [Claims] 1. A truck capable of running, a boom connected to the truck so as to be tiltable and suspending an excavator via a wire, and swinging and press-fitting by clamping a casing tube incorporated in a front portion of the truck. A shaft excavation device having a swing press-fitting mechanism, wherein the swing press-fit mechanism is formed so as to be able to be reduced in width.