JPS632551Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for performing foundation work underground during the construction of a building, and more particularly to an earth drill device capable of drilling into the ground.

Generally, an earth drilling device has a bucket with a drill blade pivotally attached to the lower end of a rectangular cylindrical Kelly bar, and by rotating the bucket with the rotation of the Kelly bar, the hinged door can be opened. As the ground is drilled with a drill blade, the excavated soil is stored in the same bucket.

Once the bucket is filled with soil, the bucket is lifted to the ground with a kelly bar, the door at the bottom of the bucket is opened on a dump truck, and the soil inside the bucket is transferred into the truck's cargo box. .

By the way, in a conventional earth drill device, the door with a drill blade at the bottom end of the bucket is composed of a single door plate, and one side of the door plate is pivotally attached to the edge of the opening at the bottom end of the bucket, so when the door is opened, the bucket The length of the door that hangs down from the bottom has become significantly longer, creating the risk of it colliding with a truck, and the latch to open and close the door must now be operated manually, making work dangerous. There is a problem.

The present invention attempts to solve these problems by configuring the door with a drill bit at the bottom end of the bucket to be double-opening, and by making it possible to open and close the door by relative movement between the kelly bar and the bucket. It is an object of the present invention to provide an earth drill device that shortens the hanging length of a door and simplifies opening/closing operations.

For this reason, the earth drilling device of the present invention has a Kelly bar suspended by a wire through a sheave at the tip of the crane boom, and a Kelly bar rotation mechanism that allows the Kelly bar to be vertically inserted so as to be vertically movable and driven to rotate. A cylindrical bucket is provided at the lower end of the Kelly bar so as to be slidable up and down, and a pair of double-opening sand discharge doors with drill blades are pivotally attached to the opening edge of the lower end of the bucket. Each proximal end of a door opening/closing link whose tip is pivotally attached to the inside of the door is pivotally attached to the lower end of the Kelly bar, and when the Kelly bar is lowered relative to the bucket, the door is opened and the bucket is opened. A crown member capable of removably holding the bucket when discharging earth and sand therein is provided at the lower part of the main body of the Kelly bar rotating mechanism.

Below, an earth drill device as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is an overall view showing its schematic structure, Fig. 2 is a sectional view showing the open state of the bucket, and Fig. 3 is a sectional view showing the open state of the bucket. Figure 1 -
FIG. 4 is an explanatory view of the engagement tube fixed to the upper end of the bucket, FIG. 5 is a view taken along the - arrow in FIG. 4, FIG. 6 is a plan view of the crown member, Figure 7 is a sectional view taken along the - line in Figure 6;
FIG. 8 is an explanatory diagram showing the engaged state of the above-mentioned engagement tube and the crown member, FIG. 9 is an enlarged view of FIG. FIG.

As shown in FIG. 1, a three-stage telescopic prismatic cylindrical Kelly bar 1 is suspended by a wire 4 through a sheave 3 at the tip of a crane boom 2.
This wire 4 is wound in and out by a winch on a crane vehicle (not shown). Note that a swivel joint 4a is interposed in the locking portion of the wire 4, thereby preventing the wire 4 from twisting.

A Kelly bar rotation mechanism 6 is supported at the upper end of the arm 5 of the crane vehicle, and the Kelly bar 1 is inserted into the Kelly bar rotation mechanism 6 so as to be able to rise and fall, and is driven to rotate. .

That is, as shown in FIG.
A small bevel gear 6b is inserted into the square hole of a so as to be able to rise and fall and rotate together with the bevel gear 6a, and a small bevel gear 6b that meshes with the bevel gear 6a is connected to a sprocket wheel 6c that is integrated therewith and a chain (not shown). The Kelly bar 1 is rotated by being rotationally driven by a drive mechanism on the crane vehicle.

In addition, at the lower end of the Kelly bar 1 shown in FIG.
The bucket bag 7 is provided so as to be able to slide up and down, and is prevented from dropping downward by a stopper (not shown).

The bottom opening edge of the bucket 7 has second, ninth, and first
As shown in Figure 0, a dirt discharge door 8 with a pair of drill blades 8a is pivotally connected with a hinge 9, and by rotating this bucket 7 together with the kelly bar 1 during drilling work, the earth and sand discharge door 8 is equipped with a pair of drill blades 8a. The soil is stored in the bucket 7 through a small opening 10 with a valve.

Each door 8 has a tip end of a door opening/closing link 11 pivotally attached to the inside thereof, and a base end of each link 11 is pivotably attached to the lower end of the Kelly bar 1.

Therefore, by lowering the Kelly bar 1 relative to the bucket 7, each door 8 is opened as shown in FIG. 10, and conversely, by raising the Kelly bar 1 relative to the bucket 7, , the left and right doors 8 are closed as shown in FIG.

By the way, when these doors 8 are opened, the bucket 7
An annular crown member 12 is suspended from the bottom of the Kelly bar rotation mechanism 6 via a hanging device 13 so that the Kelly bar 1 can be held in a detachable manner.
is disposed so as to pass through the inside of the crown member 12.

In order to hold the bucket bag 7 with the crown member 12, three claws 14 are pivotally attached to the wall of the crown member 12 at 120 degree intervals as shown in FIGS. An engagement cylinder 16 having three engagement edges 15 that can be engaged is fixed to the upper end of the bucket bag 7. (See Figures 4, 5, and 10.) When the bucket 7 is to be engaged with the crown member 12, the Kelly bar 1 is raised by the wire 4, and the engagement tube 16 at the top of the bucket 7 is raised as shown in Figure 8. The engaging edge 15 is made to once pass above the claw 14 of the crown member 12.

At this time, the engaging edge 15 displaces the pawl 14 as shown by the two-dot chain line and passes upward, or reaches the top through the gap between the pawls 14.

Then, by slightly rotating the Kelly bar 1, the claw 14 is attached to the stopper 15a at the end of the engagement edge 15.
When the Kelly bar 1 is lowered a little after the two are brought into contact with each other, the engaging edge 15 rests on the claw 14 held horizontally, and the bucket 7 is thereby held by the crown member 12. .

In addition, when releasing the bucket 7 downward from the state held by the crown member 12, the Kelly bar 1 is slightly rotated in the opposite direction to the above-mentioned rotation direction, and the engagement edge end of the engagement tube 16 is stopper 1
5a is brought into contact with the other pawl 14, and then the Kelly bar 1 is lowered, so that the engaging edge 15 is brought into contact with the other pawl 14.
They pass through the mutual gap and are released downward, allowing the bucket 7 to freely descend.

Since the earth drill device of the present invention is constructed as described above, the kelly bar 1 and the bucket 7 are
is lowered to a desired point, and then the bucket 7 is rotated via the Kelly bar 1 by the Kelly bar rotation mechanism 6, and excavation is performed by the drill blade 8a, and the excavated soil is passed through the small opening 10 into the bucket 7.
It accumulates inside.

After drilling the ground in this way and filling the bucket 7 with the excavated soil, the rotation of the Kelly bar 1 is stopped and the soil is pulled up.
Raise Bucket 7 from underground to above ground.

After holding the bucket 7 to the main body of the Kelly bar rotation mechanism 6 via the crown member 12, the Kelly bar 1 is slightly lowered on a dump truck or the like, and the door 8 of the bucket 7 is held as shown in FIG. , and release the soil in the bucket 7 and transfer it to the dump truck.

At this time, since the door 8 is of a double-opening type, there is no fear that the tip of the opened door 8 will collide with the dump truck even if the bucket truck 7 is at a relatively low level.

Next, the door 8 of the bucket 7 is closed by raising the Kelly bar 1, and then the bucket 7 is moved to the crown member 1.
2 and repeat the drilling operation described above.

In addition to the means for holding the bucket 7 by the crown member 12, in addition to the above-described engagement between the claw 14 and the engaging edge 15, an electromagnet may be provided on the crown member 12 to attract and fix the bucket 7 made of a magnetic material. It is also possible to use In this case, the bucket bag 7 can be easily engaged and disengaged from the crown member 12 by switching between activation and deactivation of the electromagnet.

As described in detail above, according to the earth drilling device of the present invention, the opening and closing operations of the earth and sand discharge door equipped with a bucket drill blade can be performed safely and efficiently, and the earth and sand discharge door can be opened in a double-opening manner. This structure is advantageous from the viewpoint of preventing collisions when opening to release earth and sand.

[Brief explanation of the drawing]

The figures show an earth drill device as an embodiment of the present invention, in which Fig. 1 is an overall view showing its schematic structure, Fig. 2 is a sectional view showing its bucket in an open state, and Fig. 3 is a first FIG. 4 is an explanatory view of the engagement tube fixed to the upper end of the bucket, FIG. 5 is a view taken along the - arrow in FIG. 4, and FIG. 6 is a plan view of the crown member. Figure 7 is the 6th
8 is an explanatory diagram showing the engaged state of the above-mentioned engagement cylinder and the crown member, FIG. 9 is an enlarged view taken in the direction of the - arrow in FIG. 1, and FIG. FIG. 2 is a vertical sectional view showing an enlarged main part of FIG. 2; 1... Kelly bar, 2... Crane boom, 3... Sheave, 4... Wire, 4a... Swivel joint,
5... Arm, 6... Kelly bar rotation mechanism, 6a... Bevel gear, 6b... Small bevel gear, 6c... Sprocket wheel, 7... Bucket, 8... Sediment discharge door, 8a...
Drill blade, 9... Hinge, 10... Small opening with valve, 1
DESCRIPTION OF SYMBOLS 1...link, 12...crown member, 13...suspension tool, 14...claw, 15...engaging edge, 15a...stopper, 16...engaging cylinder.

Claims (1)

[Scope of utility model registration request] A Kelly bar is suspended by a wire through a sheave at the tip of the crane boom, a Kelly bar rotation mechanism that allows the Kelly bar to be inserted vertically so as to be vertically movable and rotated, and a Kelly bar that slides up and down at the lower end of the crane boom. A movable cylindrical bucket is provided, and a pair of double-opening sand discharge doors with drill blades are pivoted to the lower opening edge of the bucket, and the tips are pivoted to the inside of these doors. Each base end of the link for opening and closing the door is pivotally connected to the lower end of the Kelly bar, and when the door is opened by lowering the Kelly bar relative to the bucket and the earth and sand in the bucket is released, the bucket is opened and closed. An earth drill device characterized in that a crown member capable of detachably holding the above-mentioned Kelly bar rotation mechanism is provided at the lower part of the main body of the Kelly bar rotation mechanism.