JP3227079B2 - Drilling bucket with enlarged blade - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavating bucket with an enlarged blade which is attached to a rotating keriba and excavates a pile hole.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, an earth drill excavator has a boom 2 provided on a self-propelled main body 1.
A sheave 4 is rotatably supported at the tip of the sheave.
Is wound around a wire rope 8 which is fed or wound by a winch 6. A kelly bar 10 is rotatably suspended at the tip of the wire rope 8 by a swivel joint 12, and the winch 6 is driven so that the kelly bar 10 can be moved up and down.

[0003] A rotary drive mechanism 16 is provided at the tip of an arm 14 supported by the main body 1.
Is inserted through the rotation driving mechanism 16 and the rotation driving mechanism 1
6, the kelly bar 10 is driven to rotate,
The kerry bar 10 is configured to slide up and down within the rotation drive mechanism 16. A digging bucket 18 is attached to the tip of the kelly bar 10, and a digging blade 20 is provided on a bottom surface of the digging bucket 18.

The excavation bucket 18 has a tip whose diameter is appropriately smaller than the inner diameter of the manhole 22 or the like inserted into the ground. Digging and digging bucket 1
8, the excavating bucket 18 is taken out of the casing and the manhole 22, and the earth and sand is discharged. In addition, the casing and the manhole 22 are buried underground while being pressed or swung.

[0005]

However, in such a conventional apparatus, since unexcavated earth and sand equivalent to the thickness of the manhole 22 and the like remains, the manhole 22 and the like are buried in the ground while being pressed or rocked. In this case, there is a problem that a large resistance is generated, and in a severe case, it may cause a breakage, resulting in poor work efficiency.

An object of the present invention is to provide an excavating bucket with an enlarged blade that can easily press-fit a manhole or the like and improve the working efficiency.

[0007]

In order to achieve the above object, the present invention takes the following means to solve the problem. That is, an excavating bucket provided with an excavating blade on the bottom surface, and a kelly bar that is raised and lowered and rotationally driven can be rotationally transmitted, and a predetermined amount is set between an excavation position and a hanging position in the axial direction of the kelly bar. Movably connected to the drilling bucket
A magnifying blade is mounted on a fulcrum pin parallel to the
Oscillating around the outer periphery of the digging bucket while being supported so that it can protrude in the radial direction, and projecting the enlarged blade by moving to the excavation position, and moving the enlarged blade by moving to the hanging position. An excavating bucket with an enlarged blade is provided with a connection mechanism that is retracted further inside.

The connecting mechanism may include a link that connects the enlarged blade side and the kelever side with a pin, or the connecting mechanism may include a bell swingably supported by the excavating bucket. One of the cranks may be connected to the keriba side, and the other may be connected to the enlarged blade side.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. The same members as those in FIG. 7 described above are denoted by the same reference numerals, and detailed description is omitted. As shown in FIG. 1 and FIG. 2, the tip 10 a of the
The cross section is formed in a square shape, and the tip 10a of the pin 2 is inserted into the bottomed square hole 24a of the connection member 24 and fitted.
5, the kelly bar 10 and the connecting member 24 are integrally connected.

The connecting member 24 has a stepped portion 24b and a square shaft portion 24c formed at the tip end of the stepped portion 24b. The square shaft portion 24c is slidably inserted into the through square hole 18a of the excavation bucket 18, and the square shaft portion 24c
A ring 26 is fitted to the tip of c. And
The pin 27 is fitted to prevent the ring 26 from coming off.

When the kelly bar 10 is raised, the excavating bucket 18 slides along the square shaft portion 24c, and comes into contact with the ring 26 to be in a suspended position where the sliding is restricted. When the bottom of the digging bucket 18 hits the bottom of the hole when the keriba 10 is lowered, the digging bucket 18
, And the excavation bucket 18 comes into contact with the step portion 24b to set the excavation position where the sliding is restricted. And
The connecting member 24 and the digging bucket 18 are relatively movable by a predetermined amount between the hanging position and the digging position.

On the other hand, as shown in FIG.
8 supported by support members 28 and 29 and inserted in parallel with the axial direction of the kelever 10
The expanding blades 32 and 33 are supported so as to be swingable. One end of each of the links 34 and 35 is rotatably pin-connected to the enlarged blades 32 and 33, and the other end of each of the links 34 and 35 is rotatably pin-connected to the connection member 24.
In this embodiment, the links 34 and 35 function as a connection mechanism.

The length and mounting position of both links 34 and 35 are
When in the excavation position, the expanding blades 32, 33
As shown by a solid line in FIG. 2, it is configured to protrude from the outer periphery of the excavating bucket 18, and when in the suspended position, the enlarged blades 32, 33 are shown by two-dot chain lines in FIG. As shown in FIG. 3, the excavating bucket 18 is configured to be retracted inward from the outer periphery.

Next, the operation of the above-described enlarged blade excavating bucket of this embodiment will be described. First, when the keriba 10 is raised, the digging bucket 18
Is in the hanging position in contact with Then, as shown in FIG. 3, the enlarged blades 32, 33 are swung around the fulcrum pins 30, 31 via the links 34, 35, and the enlarged blades 32, 33 are rotated.
Are retracted inside the outer periphery of the excavation bucket 18.

In this state, the keliva 10 is lowered,
The excavation bucket 18 is inserted into the manhole 22.
When the bottom surface of the excavation bucket 18 hits the bottom of the hole and the Keriva 10 is further lowered, as shown in FIG.
4c slides in the through-hole 18a, and the excavation bucket 18 hits the step portion 24b. Further, the enlarged blades 32 and 33 are swung around the fulcrum pins 30 and 31 via the links 34 and 35, and the enlarged blades 32 and 33 protrude from the outer periphery of the excavation bucket 18 as shown in FIG. .

When the kelly bar 10 is driven to rotate, the excavating bucket 18 is also rotated via the connecting member 24, so that the bottom of the hole is excavated by the excavating blade 20, and the side surfaces of the hole are enlarged by the expanding blades 32 and 33. In particular, the thickness of the manhole 22 is excavated. Then, the excavated earth and sand is stored in the excavation bucket 18, and when the excavated soil is full, the kelly bar 10 is once raised.

When the keriba 10 is raised, the square shaft 24
c slides in the through-hole 18a, and the digging bucket 18 collides with the ring 26 to be in the suspended position. Further, one ends of the links 34 and 35 are pulled up, and the enlarged blades 32 and 3 are raised.
3 is swung around the fulcrum pins 30 and 31, and the enlarged blade 3
2 and 33 are retracted inward from the outer periphery of the excavation bucket 18.

As a result, the excavating bucket 18 is pulled up inside the manhole 22 without the expanding blades 32 and 33 hitting the inner wall of the manhole 22. After discharging the earth and sand from the excavation bucket 18 pulled out of the manhole 22, the excavation bucket 18 is inserted into the manhole 22 again, and excavation is continued in the same manner as described above. In addition, manhole 2
The same applies to a casing or the like instead of 2.

Next, a second embodiment different from the above-described embodiment will be described with reference to FIGS. The same members as those in the above-described embodiment are denoted by the same reference numerals, and detailed description is omitted. In the second embodiment, the link 3 described above is used.
The bell crank 5 swingably supported by support plates 50 and 51 erected on the excavation bucket 18 instead of the bell crank 5
2, 53 are provided. Slots 52a, 52b, 53a, 53 are provided at both ends of the bell cranks 52, 53, respectively.
b is formed. The connecting members 24 and the bell cranks 52, 53 are connected by pins 54, 55 slidably inserted into one of the long holes 52a, 53a, and the other long holes 52, 53a.
The magnifying blades 32, 33 and the bell cranks 52, 53 are connected by pins 56, 57 slidably inserted in b, 53b. In this embodiment, the bell cranks 52, 5
3 serves as a connection mechanism.

As shown in FIG. 5, when the bell cranks 52 and 53 are swung, the enlarged blade 3
2, 33 protrude from the outer periphery of the excavating bucket 18 and, as shown in FIG.
2, 33 can be retracted inside the outer circumference of the excavation bucket 18. Thereby, as described above, the thickness of the manhole 22 can be excavated.

As described above, the present invention is not limited to such an embodiment, and can be implemented in various modes without departing from the gist of the present invention.

[0022]

As described above in detail, the excavating bucket with an enlarged blade according to the present invention can extrude the enlarging blade from the outer periphery of the excavating bucket when the excavating position is at the excavating position, excavate a manhole or the like by the thickness thereof, , The digging blade can be retracted from the outer circumference of the digging bucket, so that it can pass through the inner circumference of a manhole or the like. Therefore, a manhole or the like can be easily press-fitted, and an effect of improving work efficiency can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part when an excavating bucket with an enlarged blade as an embodiment of the present invention is at an excavation position.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view of main parts when the excavating bucket with an enlarged blade of the present embodiment is at a suspended position.

FIG. 4 is an explanatory diagram of the present embodiment when the enlarged blade is projected.

FIG. 5 is a cross-sectional view of main parts when the excavating bucket with an enlarged blade according to the second embodiment is at an excavating position.

FIG. 6 is a cross-sectional view of main parts when the excavating bucket with an enlarged blade according to the second embodiment is at a suspended position.

FIG. 7 is a side view of the earth drill rig.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Keliva 18 ... Drilling bucket 20 ... Drilling blade 22 ... Manhole 24 ... Connecting member 34,35 ... Link 52,53 ... Bell crank

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E21B 11/00

Claims (3)

(57) [Claims] An excavating bucket provided with an excavating blade on a bottom surface and a kelly bar that is raised and lowered and driven to rotate can be transmitted in rotation, and between an excavation position and a hanging position in the axial direction of the kelly bar. Movably connected by a predetermined amount, and a magnifying blade is mounted on the upper surface of the digging bucket in the axial direction of the keriba.
Swingable about a fulcrum pin parallel to the
And a connection mechanism for projecting the enlarged blade by moving to the excavation position and retracting the enlarged blade inward from the outer periphery of the excavation bucket by moving to the hanging position. Excavating bucket with enlarged blade. 2. The excavating bucket with an enlarged blade according to claim 1, wherein the connection mechanism includes a link that connects the enlarged blade side and the kelever side with a pin. 3. The connection mechanism according to claim 1, wherein the connection mechanism connects one of a bell crank supported swingably to the excavating bucket to the kelly bar side and the other to the enlarged blade side. Excavating bucket with enlarged blade.