JPH0517353B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drilling head for use in an earth auger device.

[Conventional technology]

As shown in FIGS. 11 and 12, an excavation head 10 used in a conventional earth auger device has a substantially cylindrical head body 12 with an engagement boss 11 on the top and a screw 13 for soil removal. The tip of the head body 12 has a digging claw 14 with a bit made of tungsten steel or the like, and a hole (not shown) for injecting cement milk is provided in the center of the head body 12, and a valve 15 is provided at the tip. It is usually constructed to prevent dirt from entering inside.

Then, the excavation head 10 is attached to the tip of a rotary shaft (not shown) and rotated with a counterweight placed on the top, the excavation claw 14 at the tip excavates the soil, and the screw 13 excavates the soil to the top. It had a structure that was built on earth.

[Problems to be Solved by the Invention] However, since the tip of the above-mentioned drilling head is flat, the drilling speed is extremely slow for sand and gravel layers, cobblestone layers, and rock layers with high N values, and in addition, wear and tear occur. There was a lot of damage and it took a long time to repair, and the excavator itself was equipped with a counterweight (about 3 tons heavy) as mentioned above.
The problem was that there was a lot of resistance and the construction time was significantly longer.

In addition, since a heavy counterweight was provided at the top, stability was poor and there was a risk of collapse.

Furthermore, since the cement milk discharge port is provided at the bottom, there is a problem that the valve may be damaged during excavation and the internal hole may become clogged.

The present invention has been made in view of the above circumstances, and the first object of the present invention is to provide an efficient excavation head for use in an earth auger device that has a high excavation speed and less wear and tear. A second object is to provide an excavation head for use in an earth auger device that does not require a counterweight mounted on the top and has a low center of gravity.

A third object of the present invention is to provide a drilling head for use in an earth auger device in which the cement milk discharge port is not clogged.

[Means for solving problems]

A first invention that meets the above first and second objectives is:
The head body is generally shaped like an inverted truncated cone, a pair of double-headed digging claws are removably provided at the tip of the head body, and a screw blade is detachably formed in a spiral shape on the head body. The screw excavation claw is freely provided, and the enlarged claw is attached to the upper part of the head body so as to be rotatable in the vertical direction and protrudes outward when being pressed by a spring during excavation.

A second invention that meets the above first and second objectives is:
The head body is generally shaped like an inverted truncated cone, the inverted cone-shaped digging pawl is removably provided at the tip of the head body, and the screw blade is removably formed in a spiral shape on the head body. The excavating claw is attached to the upper part of the head body so as to be rotatable in the vertical direction and is pressed by a spring during excavation and protrudes outward.

A third invention in accordance with the above-mentioned third object includes a head main body having a substantially inverted truncated conical shape as a whole, an excavating claw removably provided at the tip of the head main body, and a digging claw provided in a spiral shape on the head main body. A screw excavation pawl is removably provided on the formed screw blade, and an enlarged pawl is attached to the upper part of the head body so as to be rotatable in the vertical direction and protrudes outward by being pressed by a spring during excavation. A drilling head for use in an earth auger device comprising: a cement milk introduction hole provided in the head body; and an outlet of the cement milk introduction hole having an enlarged diameter portion on a side surface of the head body. This enlarged diameter portion is provided with a valve.

[Effect]

In the excavation head used in the earth auger device according to the first aspect of the invention, a pair of double-headed excavation claws is provided at the tip of the head main body having an approximately inverted truncated cone shape as a whole, so that the excavation claws are used for digging. It can take a large load per area, and since screw blades are formed on the side of the head body and screw excavation claws are provided on the screw blades, it fits into the ground while pushing apart the surroundings and excavates. Discharge the crushed stones and mud to the top. The upper part of the head body has an expanding claw that is pressed by a spring and protrudes outward, so it is possible to drill a hole of a constant diameter as it rotates, and the upper steel pipe is gradually inserted into the ground. It can be lowered.

In the excavation head used in the earth auger device according to the second invention, since the inverted conical digging claw is provided at the tip of the approximately inverted truncated conical head body, this further improves the tip. It becomes possible to apply a concentrated load to the digging claw, and the digging speed can be further improved.

Further, in the first and second aspects of the invention, since the head body is relatively heavy, the weight of the head body is also added during excavation, and in particular, there is no need for a counterweight as in the prior art.

Next, in the excavation head used in the earth auger device according to the third invention, since the outlet (discharge port) of the cement milk introduction hole is provided on the side of the head body, the excavated earth pressure is reduced during excavation. It does not directly contact the valve at the tip, so the valve is less likely to be damaged, and since there is no earth pressure, the introduction hole will not be clogged with soil or the like.

〔Example〕

Next, embodiments embodying the present invention will be described with reference to the attached drawings to provide an understanding of the present invention.

Here, FIG. 1 is a side view of an excavation head used in an earth auger device according to an embodiment of the first invention;
2 is a bottom view of the same, FIG. 3 is a sectional view taken along arrow A-A in FIG. 1, and FIG. 4 is a sectional view taken along arrow B-- in FIG. 1.
B sectional view, FIG. 5 is an enlarged sectional view of the C section in FIG. FIG. 9 is a side view of the entire excavation device with the excavation head attached thereto used in the earth auger device, FIG. 9 is a side view of the excavation head used in the earth auger device according to the second embodiment of the invention, and FIG. 10 is the same excavation claw. FIG.

As shown in FIGS. 1, 2, and 3, the excavation head 16 used in the earth auger device includes a head body 17 and a pair of excavation claws 18 attached to the tip of the head body 17. , has screw digging claws 20, 21, 22 attached to the screw blade 19 on the side, enlarged claws 23, 24, 25 attached to the upper part of the head main body 17, and an upper mounting head 26. It is composed of

The head body 17 has a substantially inverted truncated cone shape as a whole and is made of S45C or equivalent steel, cast steel, or stainless steel, and has sufficient weight. A screw blade 19 is spirally formed on the side surface (welding, forging, or casting is also possible), and the lower part of the screw blade 19 is
Screw digging claws 20, 21 in the middle and upper part,
22 is removably attached with screws. A bit made of tungsten steel is fixed to the tips of the screw digging claws 20, 21, and 22 to form a digging blade.

A pair of double-headed digging claws 18 is attached to the lower part of the head main body 17.
consists of a support 28 and bits 29 and 30 made of tungsten steel at the tip, and the support 28 is split into two at the top as shown in FIG.
1 and 32 to be attached to the head body 17.

On the other hand, an enlarged claw 2 is provided at the top of the head body 17.
3, 24, 25 are attached via pins 33, 34, 35 so as to be rotatable from the horizontal direction to the diagonally downward direction, and the tips of the enlarged claws 23, 24, 25 are also provided with bits 36, 37 made of tungsten steel. , 38 are attached to constitute a digging blade.

This enlarged claw 25 (the same applies to 23 and 24)
As shown in FIG.
9 and 40, the enlarging claw 25 itself is oriented horizontally, but when the tip of the enlarging claw 25 is pushed downward, it rotates against the springs 39 and 40, and is directed diagonally downward. The structure is such that the enlarging claw 25 is housed, so that the entire rotation radius can be reduced. Note that the spring 39,
Blind plugs 42 and 43 are provided at the upper and lower parts of 40, respectively, and if necessary, the blind plugs 42 and 43 can be removed to repair the interior.

Here, as shown in FIGS. 6 and 7, the mounting structure of the enlarged claw uses a winding spring 47 in which engaging protrusions 45 and 46 are provided in the winding direction on the pin 44, and the engaging protrusion 45 , 46 as spring 4
It is also possible to engage the enlarged claw 48 and the head body 17, respectively, with a rotational biasing force applied to the enlarged claw 7, so that the biasing force is always exerted in an upward direction, and the enlarged claw 48 is held in the horizontal direction.

As shown in FIG.
1 and is housed inside the head body 17, and the upper part is fixed by a mounting head 26.

At the top of this head body 17 is a mounting head 2.
6 is installed, but this mounting head 26
is the notch hole 5 shown in Fig. 3 by the dowel pin.
2, 53, and 54, and also firmly connected by bolts installed in surrounding bolt holes 55.

A connecting column 56 formed into a polygonal column is provided at the upper part and is connected to a rotating shaft (not shown) at the upper part.

An introduction hole 57 for injecting cement milk is formed in the center of the head body 17.
It is connected to an introduction hole 58 formed in. As shown in FIG. 4, the outlets 59, 60, and 61 of the introduction hole 58 are provided on the side surface of the head body 17 in three directions, and enlarged diameter portions 62, 63, and 64 are formed at the outlet end. Valves 65, 66, and 67 made of rubber plates are provided in the diameter portions 62, 63, and 64, and cement milk comes out from inside, but foreign matter does not get in from outside.

Therefore, when using the excavation head 16 for this earth auger apparatus, the excavation head 16 used for the earth auger apparatus is attached to the lower end of the rotating shaft of the screw 68, as shown in FIG.
Here, 69 is the steady rest, 70 is the excavator, and 7 is the steady rest.
1 is the main winding wire, 72 is the top sheave,
73 is a leader, 74 is a support, 75 is a secondary wire, 76 is a pendant wire, 77 is a primary wire, and 78 is a generator.

First, dig into the ground with the digging claw 18 at the tip,
The diameter is expanded with the screw digging claws 20, 21, 22 on the side, and the final diameter is expanded with the enlarged claws 23, 24, 25 on the top, and the excavation is carried out in a circular plane shape as shown in Fig. 1. The upper steel pipe 80 can be lowered together with the excavation. Here, the excavated stones, rocks, etc. are appropriately crushed by the digging claws and then discharged to the top together with mud. If the digging claw is damaged, replace only that part and start digging again.

When the excavation head 16 used in the earth auger device is raised, the tips of the enlarged claws 23 to 25 hit the lower end of the steel pipe 80, and the enlarged claws 23 to 25 rotate downward against the spring. , steel pipe 8
It is stored within 0 and rises.

Next, the excavation head 81 used in the earth auger device according to the second embodiment of the invention shown in FIGS. 9 and 10 will be explained. Here, the same components as those of the excavation head 16 used in the earth auger device are given the same numbers and detailed explanation thereof will be omitted.

Drilling head 81 used in the earth auger device
The excavating claw 82 attached to the tip of the head body 17 has an inverted conical shape, and a plurality of bits 83 made of tungsten steel are attached to the side of the claw.
is fixed.

As shown in FIG. 10, the support member 84 of the excavating claw 82 is divided into two halves at the upper part and is screwed onto the head body 17.

Since the tip of the excavating head 81 is formed into an inverted conical shape in this way, the load is concentrated on the upper part and a greater excavating force is exerted.

If there is a relatively large rock or boulder at the bottom, it will not be possible to excavate with this conical excavation claw, so the excavation head 16 used in the earth auger device will be used.

Note that the number of digging claws in the above embodiments does not limit the present invention, and a necessary number of digging claws are provided depending on the diameter of the digging head.

〔Effect of the invention〕

According to the excavation head used in the earth auger device according to claim 1 or 2, the head main body has an inverted truncated conical shape, and a large load is applied to the excavation claw at the tip to perform first excavation and subsequent excavation. Since the earth is removed while excavating with the screw excavator claw and the enlarged claw, the construction period is short and the excavation can be carried out efficiently, and no strain is placed on the excavator and no strain is placed on the screw removing the earth.

Since the tip is recessed, there is no possibility of pile misalignment, and by making the head body heavier, a counterweight can be omitted, making it possible to perform stable excavation at all times.

In particular, in the excavation head used in the earth auger device according to claim 1, even when excavating a large and hard rock, the rock can be efficiently crushed and excavated.

The drilling head used in the earth auger device according to claim 2 has a pointed tip with an inverted conical shape, so that the load is concentrated on the tip, excavating the lower hole with a large force, and drilling the next screw. Since excavation is performed using the excavating claw and the expanding claw, excavation can be performed extremely efficiently.

Further, in the excavation head used in the earth auger device according to claim 3, since the outlet of the cement milk introduction hole is provided on the side of the head body, the earth pressure generated during excavation is not directly applied. Therefore, the valve will not be damaged and the introduction hole will not be clogged.

[Brief explanation of the drawing]

FIG. 1 is a side view of a digging head used in an earth auger device according to an embodiment of the first invention, FIG. 2 is a bottom view of the excavation head, FIG. 4 is a sectional view taken along arrow B-B in FIG. 1, FIG. 5 is an enlarged sectional view taken along arrow C in FIG. 1, and FIGS. 6 and 7 respectively show enlarged claws according to other embodiments. A side view and a plan view, FIG. 8 is an overall side view of the excavation device to which the excavation head used for this earth auger device is attached, and FIG. 9 is an excavation head used for the earth auger device according to the embodiment of the second invention. Fig. 10 is a side view of the excavating claw, Fig. 11 is a side view of the excavating claw.
The figure is a side view of an excavation head used in a conventional earth auger device, and FIG. 12 is a bottom view of the excavation head. [Explanation of symbols], 16...Drilling head used for earth auger device, 17...Head body, 18
...Drilling claw, 19...Screw blade, 20,2
1, 22...screw digging claw, 23, 24, 2
5...Enlarged claw, 26...Mounting head, 28...
Support, 29, 30... Bit, 31, 32...
Screw, 33-35...Pin, 36-38...Bit, 39, 40...Spring, 41...Tension rod, 42, 43...Blind plug, 44...Pin, 45,
46...Engaging protrusion, 47...Spring, 48...
...Enlarged nails, 49-51...Butsing, 52-5
4...Knot hole, 55...Bolt hole, 56...Connection column, 57, 58...Introduction hole, 59-61...
...Exit, 62-64...Enlarged section, 65-67...
Valve, 68... screw, 69... steady rest, 70... excavator, 71... main winding wire,
72...Topsheeb, 73...Leader, 74
...Strut, 75...Secondary line, 76...Pendant wire, 77...Primary line, 78...Generator, 80
...Steel pipe, 82...Drilling claw, 83...Bit.

Claims (1)

[Scope of Claims] 1. A head body having a generally inverted truncated conical shape as a whole, a pair of double-headed digging claws removably provided at the tip of the head body, and a spirally formed head body on the head body. The screw excavation claw is removably provided on the screw blade, and the enlarged claw is attached to the upper part of the head body so as to be rotatable in the vertical direction and protrudes outward when being pressed by a spring during excavation. An excavation head used for an earth auger device characterized by: 2. A head body whose overall shape is approximately an inverted truncated cone, an inverted cone-shaped excavating pawl removably provided at the tip of the head body, and a screw blade formed in a spiral shape on the head body that can be removed. It is characterized by having a screw excavation claw which is freely provided, and an enlarged claw which is attached to the upper part of the head body so as to be freely rotatable in the vertical direction and protrudes outward when being pressed by a spring during excavation. Drilling head used for earth auger equipment. 3. A head body having a substantially inverted truncated conical shape as a whole, a digging claw removably provided at the tip of the head body, and a screw blade removably provided on a screw blade formed in a spiral shape on the head body. An excavation head for use in an earth auger device, comprising a screw excavation pawl, which is attached to the upper part of the head body so as to be rotatable in the vertical direction, and an enlarged pawl that is pressed by a spring and protrudes outward during excavation. The head body is provided with a cement milk introduction hole, and the outlet of the cement milk introduction hole is formed with an enlarged diameter part on the side surface of the head body, and furthermore, this enlarged diameter part has a valve. An excavation head for use in an earth auger device, characterized in that it is provided with an earth auger device.