JPH1181365A - Narrow deep ditch excavator and clamshell bucket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a narrow deep ditch excavator to perform excavation of a narrow ditch having an arbitrary depth and also excavation of a ground. SOLUTION: A rod drive device 10 having first and second rollers 20a and 20b is mounted on the tip part of the work machine of a hydraulic shovel 1. An extension rod 40 is nipped between the first and second rollers 20a and 20. A clamshell bucket 50 is mounted on the lower end part of the rod 40. During excavation, by rotating the first and second rotation rollers 20a and 20b, the rod 40 is lowered and forced into pressure contact with an excavation surface. Regulation of depth is effected through extension of the rod 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a hydraulic construction machine,
In particular, the present invention relates to a narrow deep groove excavator in which a vertically movable clamshell bucket is mounted on the tip of an arm of a hydraulic shovel and a clamshell bucket.

[0002]

2. Description of the Related Art Sheet piles have hitherto been used in urban areas, and in recent years, construction work has been carried out to increase the number of basements in general houses. When hitting a sheet pile in an urban area, hitting the sheet pile with a hammer as in the past causes a lot of vibration and noise, and complaints are received from the local residents. For this reason, a work of digging a groove with a clamshell bucket, arranging sheet piles in the groove, and then backfilling the groove is generally performed. In addition, when adding a basement in an urban area, a trench corresponding to a wall of the basement is dug, and a cement is poured into the trench to form a side wall (this is referred to as “connected wall”). For that purpose, it is necessary to excavate narrow, deep and continuous grooves.

[0003] Conventionally, when excavating a narrow, deep and continuous groove, it is usual to excavate by raising and lowering a clamshell bucket. As a method of raising and lowering the clamshell bucket, a method of attaching the clamshell bucket to the lower end of the telescopic arm attached to the tip of the working machine of the construction machine, and a method of suspending the clamshell bucket by a wire rope at the tip of the working machine of the construction machine And is commonly done.

[0004]

However, in the above-described telescopic arm system, if a deep groove is to be excavated due to its structure, the structure becomes heavy and complicated. Therefore, there is a problem that the excavation depth is limited and a deep groove cannot be excavated. In addition, there is a limit to the elevating speed, and it is difficult to shorten the cycle time and work efficiently. On the other hand, in the wire rope method, excavation is performed by the weight of the clamshell bucket. For this reason, a small clamshell bucket having a small width has a small weight, and it is difficult to excavate hard ground such as ground.

The present invention has been made in view of the above-described problems, and is intended to reduce the width of a groove having a small width and continuous depth, and to reduce the weight of the groove.
It is possible to excavate with a simple configuration, to shorten the cycle time and improve the work efficiency, and to provide a narrow deep trench excavator and a clamshell bucket capable of excavating the ground. I have.

[0006]

Means for Solving the Problems, Functions and Effects In order to achieve the above object, a first aspect of the present invention relates to a working machine attached to an upper rotating body of a hydraulic construction machine. And a rod driving device 10 attached to the tip of an arm 5 of a working machine, and a rod driven by the rod driving device 10 and capable of moving in a vertical direction. 40 and a clamshell bucket 50 attached to the lower end of the rod 40 and opened and closed by hydraulic pressure.

In the first configuration, the hydraulic clamshell bucket 50 is provided at the distal end of the rod 40 which can be moved up and down by the rod driving device 10, so that the clamshell bucket 50 can be pressed against the digging surface. For example, it is possible to excavate a hard excavated surface such as ground.

Second, in the first narrow-groove deep-groove excavating device, the rod driving device 10 comprises a pair of rotating rollers 20a and 20b for vertically moving the rod 40 while holding the rod 40 therebetween.
And a hydraulic motor 22 for driving the rotating rollers 20a and 20b.

In the second configuration, the rotating rollers 20a, 20a
Since the rod 40 is nipped and rotated at 0b, the rod 40 is driven by the frictional force between the rotating rollers 20a and 20b. Therefore, when the surface to be excavated is hard and an unexpectedly large force is applied to the clamshell bucket 50, the friction surface slides, and damage to the clamshell bucket 50 can be prevented.

Third, in the second narrow and deep groove excavator, the rod driving device 10 has a pressing cylinder 14 for clamping the rod 40 with a predetermined force between the pair of rotating rollers 20a and 20b. I have.

In the third configuration, the pressing force of the pressing cylinder 14 against the rotating rollers 20a and 20b against the rod 40 can be controlled. It should be noted that by changing the hydraulic pressure set of the hydraulic motor 22, the rotational torque of the hydraulic motor 22 can be controlled, whereby the force of the rotary rollers 20a, 20b pressing against the rod 40 can also be controlled. That is, the pressing force of the rod 40 against the ground can be adjusted, and the working efficiency can be improved by pressing the rod 40 with a force suitable for the surface to be excavated. Also, by relaxing the pressing force of the rod 40, the clamshell bucket 50
Further, the rod 40 can be dropped by its own weight, and the cycle time can be shortened.

Fourth, in the second or third narrow deep groove excavator, a pair of rotating rollers 20a and 20b are provided side by side in a direction perpendicular to the front-rear direction of the upper rotating body 3. .

According to the fourth configuration, the following operation and effect can be obtained. Each of the rotating rollers 20a and 20b is a disk. If such rotating rollers 20a and 20b are provided side by side in the front-rear direction of the upper swing body 3, the front rotating roller 20a (or 20b) protrudes forward. Therefore, for example, when digging a groove immediately before the vertical wall, the rotary roller 20a (or 20b) on the front side collides with the vertical wall, thereby restricting the digging of the groove near the vertical wall. However, the fourth
According to the configuration, since the rotating rollers 20a and 20b are provided on the left and right sides in a direction perpendicular to the front-rear direction of the upper swing body 3, it becomes possible to excavate a groove closer to the vertical wall.

Fifth, in the second, third or fourth narrow and deep groove excavating apparatus, a means for preventing rotation of the rod 40 with respect to the rod driving apparatus 10 is provided.

In the fifth configuration, the opening / closing direction of the clamshell bucket 50 is always kept constant with respect to the rod driving device 10, so that a stable trench excavation operation can be performed.

Sixth, in the above-mentioned first narrow deep trench excavator, the rod 40 has a connecting means which can be replenished.

In the sixth configuration, the length of the rod 40 can be arbitrarily increased, and a groove having an arbitrary depth can be lightly excavated with a simple configuration, thereby improving workability. . By setting the length of the rod 40 alone to a predetermined length, it is advantageous in terms of transportation.

Seventh, in the first narrow deep trench excavator, the clamshell bucket 50 has a pair of buckets 70, 70 that open and close at the bottom, and the buckets 70, 70 in the opening and closing direction at the top. Is characterized in that it has protruding members 90, 90 that protrude below the full width when fully opened.

According to the seventh configuration, the following operation and effect can be obtained. When the clamshell bucket 50 is pressed against the ground surface, even if the clamshell bucket 50 is inclined due to the land condition, since the protruding members 90 and 90 tips hit the groove wall, the inclination of the clamshell bucket 50 can be prevented,
Therefore, the trench can be excavated with high precision.

Eighth, in the first narrow deep trench excavator, the clamshell bucket 50 is provided with buckets 70, 7 having teeth 73 having a height H larger than the width W at the tip.
0 is openable and closable.

According to the eighth configuration, the teeth 73 have a relationship of "H>W". Therefore, on the excavation surface, in addition to the first excavation locus determined by the tip lip surfaces of the buckets 70, 70, the second excavation locus determined by the height H of the teeth 73 and deeper than the first excavation locus is provided. The same number of teeth 73 occurs. Therefore, in the excavation of the cohesive soil, the adhesive force between the buckets 70 and 70 and the cohesive soil is reduced by the amount of the second excavation locus, and the air in the second excavation locus communicates with the outside air. Further, the suction force when the clamshell bucket 50 is pulled up is also drastically reduced. That is, the lifting force of the clamshell bucket 50 can be greatly reduced, and energy can be saved.

Ninth, in the first narrow deep trench excavator, the buckets 70, 70 of the clamshell bucket 50 are provided.
Are characterized in that they have side cutters 75 which are greatly extended outward from the side surfaces.

According to the ninth configuration, the following operation and effect can be obtained. Since the side cutters 75 are greatly extended outward from the side surfaces of the buckets 70, 70, the digging width is increased accordingly. Therefore, when the excavated soil is clayey, the adhesiveness between the buckets 70 and 70 and the adhesive soil is reduced by the extent of the excavation width, and the air in the excavation locus 7c communicates with the outside air. The attraction force when pulling up the clamshell bucket 50 is also greatly reduced.
When the clamshell bucket 50 is inserted into the groove for re-excavation, the clamshell bucket 50 can be inserted into the groove 7 by its own weight by an amount corresponding to the increase in the excavation width. That is, the lifting force and throwing force of the clamshell bucket 50 can be greatly reduced.

Tenthly, in a clamshell bucket having a pair of buckets which can be opened and closed at the tip, the bucket has (A) a tooth having a height larger than a width at the tip, and (B) a side at a side face. It is characterized in that it has one or both of a side cutter and a side cutter that protrude outward from the side surface.

The tenth configuration is the clamshell bucket itself, which is configured based on the following. The eighth and ninth configurations,
The function and effect are not limited to the narrow deep trench excavator based on the first configuration, but can be applied to other conventional telescopic arm type or wire type clamshell buckets. is there.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 1 is an overall side view of a hydraulic shovel equipped with a narrow deep trench excavator, and FIG. 2 is a front view. An upper swing body 3 is mounted on the lower traveling body 2 of the hydraulic excavator 1 so as to swing freely. A boom 4 and an arm 5 of a work machine having a base end connected to the upper swing body 3 on the upper swing body 3 are provided.
The arm 5 has a narrow deep groove excavator 6 attached to the tip of the arm 5. The narrow deep trench excavator 6 is driven by the rod drive device 10 and the rod drive device 10,
It comprises a vertically movable rod 40 and a hydraulic clamshell bucket 50 attached to the distal end of the rod 40. The width W of the clamshell bucket 50 is a narrow width suitable for forming a continuous wall. Clamshell bucket 5
Hydraulic pipes 61 and 62 for opening and closing drive 0 connect the hydraulic device (not shown) of the upper swing body 3 and the clamshell bucket 50 via a pair of hose reels 63 and 63. When the rod 40 is moved up and down, the hydraulic pipes 61 and 62 are wound around the hose reels 63 and 63 so that they are not loosened.

FIG. 3 is a front view of the rod driving device 10, and FIG. 4 is a sectional view taken along line AA of FIG. A pair of first and second rotating rollers 20a, 20b are disposed in parallel on the main body 11, and a rod 40 is sandwiched between V-shaped flanges 21a, 21b provided on respective circumferences. It has become. The first and second rotating rollers 20a and 20b are driven to rotate in opposite directions by a hydraulic motor 22 via a speed reducer 23, respectively. The first rotating roller 20a is fastened to the main body 11 by a bolt 24.
The second rotating roller 20b is fastened to a case 25 by a bolt 26, and the case 25 is swingably hung on the main body 11 by a pair of first links 12, 12 and second links 13, 13. And the first and second links 12, 13
The body 11 and the case 25 constitute a four-bar link. The lower end of the case 25 and the main body 11 are connected by a pair of pressing cylinders 14, 14.
b is drawn toward the first rotating roller 20a and pressed against the rod 40 held between the respective flanges 21a and 21b.

FIG. 5 is a detailed view of a portion B in FIG. As described above, the flange 21a of the first rotating roller 20a and the second
The rod 40 is located between the rotating roller 20b and the flange 21b.
, And the flanges 21 a, 2
1b is pressed against the outer peripheral surface of the rod 40. Flange 21
The rods 40a and 21b are pressed against each other at points P1 to P4 to generate a frictional force. Therefore, the first rotating roller 20a and the second
By rotating the rotation rollers 20b in opposite directions, the rod 40 moves in one direction (upward) or the other direction (downward). A pair of protrusions 41, 4 are provided at symmetrical positions on the outer surface of
1 is provided, and the flange 40 is connected to the rod 40 by the flanges 21a and 21b.
Of the rotation preventing means. Therefore, the direction of the clamshell bucket 50 with respect to the rod driving device 10 is always kept constant.

In FIG. 3, a pair of guide rollers 30, 30 is attached to the upper part of the main body 11. FIG. 6 shows FIG.
The guide rollers 30, 30 are rotatably supported at predetermined intervals by shafts 32, 32 via bearings 33, 33 at brackets 31 fixed to the upper part of the main body 11. I have. The guide rollers 30, 30 hold the rod 40 between the respective flanges 34, 34. The upper part of the rod 40 held between the first and second rotating rollers 20a, 20b is held. To prevent them from falling down.

The rod 40 is provided with connecting means that can be added. FIG. 7 shows an example of the connecting means, in which a male screw 42 is provided at the upper end of the rod 40.
A female screw 43 is provided at the lower end of the other rod 40a and screwed in, so that refilling is possible. Therefore, a trench excavation of an arbitrary depth is possible. Further, by setting the length of the rod 40 alone to a predetermined length, it is possible to make it advantageous for transportation.

Next, the hydraulic clamshell bucket 5
0 will be described with reference to FIGS. FIG. 8 is a front view of the clamshell bucket 50. A block 44 is fastened to the lower end of the rod 40 with a bolt 45, and a piston rod 51 is suspended from the block 44 via a support 46. I have. A pair of buckets 70, 70 are connected to the lower end of the piston rod 51 by pins 71, 71, respectively, so as to be rotatable in the opening and closing directions. A cylinder 52 is slidably fitted on the piston rod 51, and the cylinder 52 and the buckets 70, 70 are pin-connected by connecting rods 72, 72, respectively. The rod 40 has a hollow hole 48, and a guide sheave 64 for a hydraulic hose is attached to the upper end thereof. FIG.
The hydraulic pipes 61 and 62 described in the above are hose reels 63 and 6
3 enters the hollow hole 48 of the rod 40 through the guide sheaves 64, 64, and the circuit 65A provided in the block 44,
It passes through 65B and is connected to the upper end of the piston rod 51 via rubber hoses 66 and 67.

FIG. 9 is a sectional view of the cylinder 52. A piston 53 is provided on the piston rod 51, and separates the cylinder 52 into an upper oil chamber 54 and a lower oil chamber 55. The first circuit 56 provided on the piston rod 51 connects the rubber hose 66 and the upper oil chamber 54, and the second circuit 57 connects the rubber hose 67 and the lower oil chamber 55. Now, when the pressure oil in the lower oil chamber 55 is discharged from the rubber hose 67 through the second circuit 57 and the pressure oil is supplied from the rubber hose 66 to the upper oil chamber 54 through the first circuit 56, the cylinder 52 is connected to the piston rod 51. To rise. On the other hand, while the pressure oil in the upper oil chamber 54 is discharged from the rubber hose 66 through the first circuit 56, the pressure oil is discharged from the rubber hose 67 to the second
When supplied to the lower oil chamber 55 through the circuit 57, the cylinder 5
2 descends with respect to the piston rod 51. That is, in FIG. 8, when the cylinder 52 slides upward along the piston rod 51, the buckets 70 and 70 open as shown by the two-dot chain line, and when the cylinder 52 slides downward, the buckets 70 and 70 become solid lines. Close as shown.

As shown in FIGS. 1 and 2, the pair of first and second rotating rollers 20a and 20b of the rod driving device 10 are arranged in the right and left directions in the direction perpendicular to the front and rear direction of the upper swing body 3. Are installed side by side.

Next, a method for excavating a narrow deep groove will be described. When excavating a narrow deep groove, as shown in FIGS. 1 and 2,
The upper swing body 3 is turned 90 ° in a direction perpendicular to the traveling direction of the lower running body 2. Next, the first and second rotating rollers 20a and 20b of the rod driving device 10 are rotated to lower the rod 40, and the clamshell bucket 50 is pressed against the surface to be excavated to excavate the groove portion 7 indicated by a thin two-dot chain line. I do. As for the excavation depth, the groove 7 having an arbitrary depth can be excavated by adding the rod 40. As described above, the first and second rotating rollers 20a and 20b of the rod driving device 10 are arranged side by side in a direction perpendicular to the front-rear direction of the upper swing body 3, and the clamshell bucket 50 opens and closes in the same direction as above. Therefore, the excavated groove 7 </ b> A is parallel to the traveling direction of the excavator 1. Therefore, the continuous groove 7A can be excavated while the hydraulic excavator 1 is advanced, and the working efficiency is improved. Further, the first and second pressing cylinders 14
When the rotating rollers 20a and 20b are separated, the rod 40 and the clamshell 50 descend by their own weight, so that the descending speed is high, the cycle time can be shortened, and the working efficiency can be improved. Furthermore, since the distance S from the center of the rod 40 to the front end surface of the narrow deep groove excavation device 6 is small, it is possible to excavate a groove near an external obstacle, thereby improving workability.

As shown in FIG. 10, the excavated earth and sand from the clamshell bucket 50 raises the rod 40 to the uppermost position by the rod driving device 10 and operates the boom 4 and the arm 5 to lift the clamshell bucket 50 upward. Then, the upper swing body 3 is swung and loaded on the dump truck 8.

Another example of the clamshell bucket 50 suitable for the above embodiment is listed with reference to FIGS.

(1) The first case is shown in FIG. 11, and FIG. 12 is a side view thereof. The clamshell bucket 50 has a pair of projecting members 90 opposed to each other at a cylinder axis symmetrical position on the outer periphery of the cylinder 52 and corresponding to the arrangement direction of the pair of buckets 70. Projecting members 90, 90
Are each in the shape of a half box as shown in FIG.
As shown in FIGS. 11 and 12, the bottom surfaces 91 are directed outward and the opposite bottom surfaces are opposed to each other, and the respective bottom surfaces are detachably attached to the outer periphery of the cylinder 52 by pins 92, 92. Connected. In addition, both are spacing plates 9
3 prevents rotation about the pins 92, 92.

According to the first case, the following operation and effect can be obtained. If there is no projecting member 90, 90,
Further, as shown in FIG. 14, when the clamshell bucket 50 is pressed against the ground, the teeth 73 of the buckets 70, 70, for example, hit one of the rocks or the stone 7 </ b> B,
If the other hits the soil, the cutting edge forces R1, R2 of both teeth 73, 73 will be different (R1> R
2), the clamshell bucket 50 is tilted, and as a result, the groove 7 cannot be excavated with high accuracy. However, according to the first case, even when the clamshell bucket 50 is inclined, the rear surface of the bottom surface 91 of the protruding members 90 hits the wall of the groove 7. Therefore, the inclination of the clamshell bucket 50 can be prevented, so that the groove 7 can be excavated with high precision.

(2) The second case is also shown in FIGS. Each of the buckets 70, 70 of the clamshell bucket 50 in FIGS. 11 and 12 has the teeth 73 shown in FIG. 15, and the relationship between the width W and the height H is “H>
W ".

According to the second case, the following operation and effect can be obtained. In the second case, the teeth 73 have a relationship of “H> W”. Therefore, when the excavation is performed by the clamshell bucket 50 of the second example, the excavation surface includes, as shown in FIG. 11, the excavation locus 7 a determined by the tip lip surfaces 74 of the buckets 70, 70, and further, the teeth 73. An excavation locus 7b determined by the height H and deeper than the excavation locus 7a occurs. Incidentally, the relationship between the width W and the height H of the teeth of the conventional clamshell bucket is not shown, but “H <W”.
It is. Accordingly, as shown simultaneously in FIG. 16 and FIG. 17 which is a side view thereof, the excavation surface by the teeth 73 of the second example (the left half in the drawing) and the excavation surface by the teeth of the conventional clamshell bucket (the right half in the drawing). Differences arise. In other words, when the excavated soil is clay, according to the conventional clamshell bucket teeth, the back surface of the bucket adheres to the clay, and when the clamshell bucket is pulled up and separated from the clay, it adheres to the clay. A large lifting force is required to oppose the force and the adsorptive force to clay based on the negative pressure generated during lifting. However, according to the second case, the number of teeth 73 causes the number of teeth 73 to be deeper than the track 7a. For this reason, the adhesive force between the buckets 70 and 70 and the adhesive soil is reduced by the excavation locus 7b, and furthermore, the air in the excavation locus 7b communicates with the outside air, so that the suction when the clamshell bucket 50 is lifted is lifted. Power also drops dramatically. That is, the pulling force of the clamshell bucket 50 can be significantly reduced as compared with the related art.

(3) A third case is shown in FIG. As shown in FIG. 12, each of the buckets 70, 70 of the clamshell bucket 50 has a side cutter 75 that protrudes outwardly (dimension d) from the side surface of each of the buckets 70, 70.

According to the third example, the following operation and effect can be obtained. In the third example, the side cutter 75 is greatly extended outward by a dimension d from the side surfaces of the buckets 70, 70. Therefore, as shown in FIG. 16, an excavation locus 7c of the side cutter 75 is generated. By the way, the side cutter of the conventional clamshell bucket is not shown,
Almost no dimension d (d ≒ 0). Therefore, as also shown in FIG. 16, the digging surface by the side cutter 75 in the third case (the digging trajectory 7c in the left half of the drawing) and the digging surface by the side cutter of the conventional clamshell bucket (the digging locus 7c in the right half in the drawing) are also shown in FIG. Is absent).
In other words, when the excavated soil is clay, according to the conventional clamshell bucket side cutter, the side of the bucket adheres to the clay, and when the clamshell bucket is pulled up and separated from the clay, it adheres to the clay. A large lifting force is required to oppose the force and the adsorptive force to clay based on the negative pressure generated during lifting. Also, when the clamshell bucket is put into the groove for re-digging, the side face of the bucket hits the wall surface of the groove, so that a force for pushing the clamshell bucket against this resistance is required. However, according to the third case, the excavation trajectory 7c is
Occurs on both sides of 0 and 70 respectively. For this reason, the adhesiveness between the buckets 70 and 70 and the adhesive soil is reduced by the amount of the excavation locus 7c, and the air in the excavation locus 7c communicates with the outside air. Adsorption power is also greatly reduced. When the clamshell bucket 50 is inserted into the groove 7 for re-digging, the width of the groove 7 is reduced by the excavation locus 7c.
The widths of 0 and 70 are large. For this reason, the clamshell bucket 50 can be thrown into the groove 7 only by its own weight.
That is, the lifting force and the throwing force of the clamshell bucket 50 can be significantly reduced as compared with the related art.

Incidentally, the buckets 70, 70 of the second and third cases can be used as a bucket for a wire type or telescopic type clamshell bucket, and in this case, the same operation and effect as described above are exerted.

A second embodiment will be described with reference to FIG. The clamshell bucket 50 of the first embodiment is 360 °
As shown in FIG. 18, the clamshell bucket 50 of the second embodiment was directly connected to the rod 40 by bolts 52 without using a rotating part. This way,
The clamshell bucket 50 does not tilt. That is, for example, oblique excavation on a cliff becomes possible. It should be noted that, though not shown, if it is freely pivotable and can be fixed at a predetermined angle, the range of use can be further expanded.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic shovel equipped with a narrow deep trench excavator according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a front view of the rod driving device.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a detailed view of a portion B in FIG. 4;

FIG. 6 is a sectional view taken along the line CC of FIG. 3;

FIG. 7 is a sectional view showing a joint means of the rod.

FIG. 8 is a front view of a hydraulic clamshell bucket.

FIG. 9 is a cross-sectional view illustrating a configuration of a cylinder portion of a hydraulic clamshell bucket.

FIG. 10 is a view showing a state in which earth and sand are loaded on a dump truck of a hydraulic shovel provided with the narrow deep trench excavator of the present invention.

FIG. 11 is a front view of a clamshell bucket having a projection member for preventing the bucket from falling down.

FIG. 12 is a side view of FIG. 11;

FIG. 13 is a perspective view of a protruding member for preventing the bucket from falling down.

FIG. 14 is an explanatory diagram of bucket falling.

FIG. 15 is a perspective view of a tooth.

FIG. 16 is a comparison diagram of the digging locus by the first embodiment and the conventional bucket.

FIG. 17 is a side view of FIG. 16;

FIG. 18 is a diagram of a second embodiment.

[Explanation of symbols]

Reference numeral 5: Arm, 6: Narrow deep groove excavator, 10: Rod driving device, 11: Main body, 12: First link, 13: Second link, 14: Pressing cylinder, 20a: First rotating roller, 2
0b: second rotating roller, 22: hydraulic motor, 23: reducer, 25: case, 30: guide roller, 40: rod, 40a: hollow hole, 50: clamshell bucket, 7
0: bucket, 73: teeth, 75: side cutter,
90: projecting member, W: groove width, tooth width, H: tooth height.

Claims (10)

[Claims] An excavator for excavating a narrow deep groove provided in a working machine attached to an upper rotating body of a hydraulic construction machine, wherein a rod attached to a tip of an arm (5) of the working machine. A driving device (10), a rod (40) driven by the rod driving device (10) and capable of moving in a vertical direction, and a rod (4
And a clamshell bucket (50) attached to the lower end of the cylinder (0) and opened and closed by hydraulic pressure. 2. The excavator according to claim 1, wherein the rod driving device (10) includes a pair of rotating rollers (20a, 20b) for nipping and moving the rod (40) in the vertical direction. A narrow and deep groove excavating device having a hydraulic motor (22) for driving rotating rollers (20a, 20b). 3. The excavator according to claim 2, wherein the rod driving device (10) is a pressing cylinder for clamping the rod (40) with a predetermined force between the pair of rotating rollers (20a, 20b). A narrow and deep trench excavation device having (14). 4. The excavator according to claim 2, wherein the pair of rotating rollers (20a, 20b) are connected to an upper rotating body.
(3) A narrow deep trench excavator, which is arranged side by side in a direction perpendicular to the longitudinal direction of (3). 5. The narrow groove excavator according to claim 2, wherein the rod (40) is connected to the rod driving device (10).
A deep groove excavation device having a rotation preventing means. 6. The excavator according to claim 1, wherein the rod (40) has connecting means that can be extended. 7. The excavator according to claim 1, wherein the clamshell bucket (50) has a pair of buckets (70, 70) that open and close at a lower portion and a bucket (70, 70) at an upper portion.
70) A narrow deep groove excavation device characterized by having a protruding member (90, 90) that protrudes the bucket (70, 70) in the opening / closing direction to less than the full width when the bucket is fully opened. 8. The clamshell bucket (50) according to claim 1, wherein the clamshell bucket (50) has a tooth (73) having a height (H) larger than a width (w) at a tip thereof. , 7
0) is a narrow and deep trench excavator characterized by having openable and closable. 9. The excavator according to claim 1, wherein each of the buckets (70, 70) of the clamshell bucket (50) has a side cutter (75) protruding outward from the side surface. ). 10. A clamshell bucket having a pair of buckets openable and closable at the tip, wherein the bucket comprises: (A) a tooth having a height greater than a width;
(B) A clamshell bucket having, on a side surface, one or both of a side cutter and a side cutter which protrude outward from the side surface.