JP3242357B2 - Drilling tool and method of placing plate material using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavation tool for forming an excavation hole in the ground and a method for driving a plate material into an excavation hole formed by the excavation tool.

[0002]

2. Description of the Related Art For example, when a sheet material such as a sheet pile is cast on a ground, particularly a bedrock layer, a boulder / cobblestone layer, a drilling tool is used to form a drilling hole in the ground, and then a drilling tool is formed. From the excavation hole, and then, the inside of the inner excavation hole is replaced with sand or the like, and a plate material is further poured into the excavation hole.

[0003]

However, in the above-mentioned conventional method, the plate material is cast after the drilling tool is pulled out from the drilling hole. Therefore, when the drilling tool is pulled out and the plate material is placed, the drilling hole is cut. There was a risk that the hole wall would collapse. In addition, since two processes of drilling with a drilling tool and placing a plate material are required, there is a problem that the operation is complicated and the operation requires a long time. Further, there is another problem that the tip of the plate is easily damaged when the plate is placed.

[0004] The present invention has been made in view of the above circumstances, upon pouring the plate material to the ground to prevent collapse of the pore walls, and when shortened of simplifying the work time of working together
In addition, the position of the sheet pile with respect to the bit must be set strictly in advance.
When starting drilling or pulling out a drilling tool,
The main purpose is to set the position of the sheet pile with respect to the unit.

[0005]

According to the present invention, there is provided an excavating tool having a cylindrical shape, a plate having a surface on which a plate is detachably supported along a longitudinal direction; A bit for perforating the ground by impact excavation, and a fixed head provided with the bit disposed on the tip end side of the casing, and provided on the holder so as not to overlap with the plate material in end view If, on the holder, comprises a movable head which is rotatably supported so that by the first position or end view overlapping the fixed head and end view taking second position overlapping the plate, wherein the movable F
When the head takes the first position, the fixed head
Housed in a recess provided radially inward, and
At the tip side of the fixed head, it overlaps with the fixed head.
At the base end side of the surface of the plate material facing the casing.
A hook is formed, and the plate material is a base end side of the plate material.
From the tip of the casing and the tip side
And a second hook formed to face the hook and engaging the hook.
Is removably supported on the casing by the
Hook is rotatable around the axis of the casing
It is characterized in that it is formed on a ring supported by the .

Here, a bit shaft for supporting the movable head is inserted into a shaft hole formed at the tip of the holder, and a plurality of protrusions are formed on the inner peripheral surface of the shaft hole. Are formed at equal intervals along the surface of the bit shaft, and the same number of protrusions as the protrusions are formed at equal intervals along the circumference of the bit axis, and the protrusions are formed between the protrusions. After fitting and inserting the bit shaft into the shaft hole, the bit shaft is rotated to engage the base end surface of the protrusion with the distal end surface of the protrusion, thereby setting the first and second positions. Preferably, the bit shaft is supported in the shaft hole.

[0007]

[0008]

On the other hand, the present invention relates to a method of driving a plate material into a drilling hole formed in the ground by a drilling tool, wherein the drilling tool has a cylindrical shape and has a surface extending in a longitudinal direction. A casing provided with a plate material detachably along the casing, and a bit disposed on the distal end side of the casing and drilling by rotary impact excavation, and the bit is disposed on the distal end side of the casing. A holder, a fixed head provided on the holder so as not to overlap with the plate material when viewed from the end face, and a first position overlapping the fixed head when viewed from the end face or the plate material when viewed from the end face. A movable head rotatably supported so as to take an overlapping second position, wherein the movable head takes the first position.
At this time, the inside of the concave portion provided radially inward of the fixed head
And fixed at the tip end of the fixed head.
The casing of the plate material overlaps the fixed head.
Hooks are formed on the surface facing the base end side, and the plate
A chuck for sandwiching the plate from the base end side,
At the tip of the shing, it is supported rotatably around its axis.
Formed on the ring toward the distal end and engages the hook
The second hook detachably supports the casing.
Release the chuck and release the plate by its own weight.
By dropping into the borehole, the casing
Remove the plate from, after drilling the movable head to the second position in a state where the plate is supported by the casing, remove the plate from the casing with the movable head to the first position, It is characterized in that only the drilling tool is pulled out from the drilling hole.

Here, a bit shaft for supporting the movable head is inserted into a shaft hole formed at the tip of the holder, and a plurality of protrusions are formed on the inner peripheral surface of the shaft hole. Are formed at equal intervals along the surface of the bit shaft, and the same number of protrusions as the protrusions are formed at equal intervals along the circumference of the bit axis, and the protrusions are formed between the protrusions. After fitting and inserting the bit shaft into the shaft hole, the bit shaft is rotated to engage the base end surface of the protrusion with the distal end surface of the protrusion, thereby setting the first and second positions. In the above, the bit shaft is supported in the shaft hole.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of the structure of a drilling tool according to the present invention. In the figure, reference numeral 1 denotes a driving unit of a drilling tool,
A cylindrical casing 2 is supported around a rod (not shown) suspended from the drive unit 1 so as to be coaxial with the rod.

On the surface of the casing 2, a sheet pile (plate material) 3 having a U-shape in end view is supported along the longitudinal direction of the casing 2 so as to cover the periphery of the casing 2. The sheet pile 3 is a chuck 4 that sandwiches the sheet pile 3 from the base end side.
And a hook 5 formed at the tip of the sheet pile 3 toward the base end on the surface facing the casing 2, and a hook formed at the tip of the casing 2 toward the tip and engaged with the hook 5 from the base end (Second hook) 6 and supported by the casing 2, and can be removed from the casing 2 by releasing the chuck 4.

The tip of the rod projects beyond the casing 2 and a bit 7 is detachably supported at the tip. The bit 7 includes a holder 8 supported at the tip of a rod, and a fixed head 9a formed on the holder 8 so as not to overlap with the sheet pile 3 in an end view.
The holder 8 is moved so as to take a first position (position indicated by A in the figure) overlapping the fixed head 9a when viewed from the end or a second position (position indicated by solid line in the figure) overlapping the sheet pile 3 when viewed from the end. And a movable head 9b freely supported.

FIGS. 2 to 4 show specific examples of the configuration of the bit 7. FIG. The holder 8 has a cylindrical shape whose tip end is enlarged, and a part of the holder 8 further projects toward the tip end on the outer peripheral portion and is enlarged in diameter to form a fixed head 9a. Here, the inner peripheral surface of the fixed head 9a is formed in an arc shape coaxial with the holder 8, and a concave portion 11 for accommodating the movable head 9b is formed radially inward of the fixed head 9a. Also, a fixed head 9 around the axis of the holder 8
The rotation diameter B of a is substantially equal to the width of the sheet pile 3.

Reference numeral 8a denotes a ventilation hole formed on the axis of the holder 8. The vent hole 8a is enlarged in diameter at the front end side to form a shaft hole 12, into which a bit shaft 13 having substantially the same diameter as the shaft hole 12 is inserted. A groove 13a is formed on the surface of the bit shaft 13 along the circumferential direction,
The bit shaft 13 is prevented from falling out of the shaft hole 12 by the engagement between the pin 14 inserted into the holder 8 and the groove 13 a.

On the other hand, a movable head 9b is integrally formed at the tip of the bit shaft 13. This movable head 9b
Is rotatable about the bit shaft 13, and as a result,
As described above, the first position (the position shown in FIG. 3) overlapping the fixed head 9a when viewed from the end surface or the second position (the position shown in FIG. 2 and FIG. 4) overlapping the sheet pile 3 when viewed from the end surface is taken. It has become possible. In this case, the movable head 9b
By the action of a stopper (not shown) provided between the fixed head 9a and the movable head 9b, the bit 7 is stopped at the first position when the bit 7 is rotated in the direction opposite to the excavation rotation direction, and the bit 7 is moved. It stops at the second position when rotated in the excavation rotation direction. Further, the outer peripheral surface of the movable head 9b is
As shown in FIG. 3, the movable head 9b is housed in the concave portion 11 when the movable head 9b assumes the first position, as shown in FIG.

On the axis of the bit shaft 13, there is formed a ventilation hole 15 communicating with the ventilation hole 8a.
Are connected to ejection ports 16a and 16b which are opened in the front end face and the side face of the movable head 9b in the movable head 9b. 2 and FIG.
As shown in (2), when the movable head 9b assumes the second position, the opening end thereof is formed to face the concave portion 11 side. Further, a tip 1 made of cemented carbide, for example, is provided on the tip end face and a part of the side face of the fixed head 9a and the tip end face of the movable head 9b.
7 are planted.

Next, a method of driving the sheet pile 3 with the excavating tool having the above configuration will be described below. First, in a state where the sheet pile 3 is supported on the surface of the casing 2, the tip of the bit 7 is pressed against the ground and the excavating tool is rotated in the excavation rotation direction. The movable head 9b and the sheet pile 3 overlap each other when viewed from the end.

Next, when the driving unit 1 is operated in this state, the rotary motion of the excavating tool around the axis and the striking motion toward the tip of the excavating tool are transmitted from the driving unit 1 to the bit 7 via the rod. Then, the ground is scraped off by the tip 17, and an excavation hole having substantially the same diameter as the rotation diameter B of the fixed head 9a is formed in the ground. Further, since the rotation diameter B of the fixed head 9a is substantially equal to the width of the sheet pile 3, the hole diameter of the excavation hole is also substantially equal to the width of the sheet pile 3. On the other hand, excavated chips generated as a result of excavation are removed by fluids such as water or air ejected from the outlets 16a and 16b through the vents 8a and 15 and are removed upward through a gap between the casing 2 and the rod. Is done.

When the drilling hole is formed to a predetermined depth, the bit 7 is reversely rotated in the state as it is, and the movable head 9b
Is returned to the first position, the chuck 4 holding the upper end of the sheet pile 3 from above is released. Then, the sheet pile 3 is shifted to the tip side (downward) by its own weight, the engagement of the hooks 5 and 6 is released, and the sheet pile 3 comes off the casing 2 and falls into the excavation hole without receiving the interference of the bit 7. Drilled into the borehole. When the sheet pile 3 is driven into the drill hole, the movable head 9
With b kept in the first position, only the drilling tool is pulled out of the drill hole.

When the sheet pile 3 is driven adjacent to the excavation hole in which the sheet pile 3 has been already driven, the arrow C in FIGS.
As shown by, the above operation may be performed after the side end portions of the adjacent sheet piles 3 are engaged in advance.

As described above, according to the method of driving the sheet pile 3 according to the present invention, the sheet pile 3 is inserted into the hole at the same time as the drilling by the drilling tool. The effect that the hole wall of the excavation hole is less likely to collapse as compared with the conventional method of placing a hole is obtained. Further, since the formation of the excavation hole and the driving of the sheet pile 3 are performed in a series of operations, the operation is simplified and the operation time is shortened as compared with the conventional method. Furthermore, since the tip surface of the sheet pile 3 is inserted into the excavation hole following the excavation tool while being covered with the movable head 9B, the excavation efficiency is high, and the tip end of the sheet pile 3 is damaged by driving. Not even.

Another structure of the bit according to the present invention is shown in FIGS. Bit 7a shown in FIGS.
A part of the holder 8 is further protruded to the distal end side, and the diameter is increased to form a fixed head 9a. Further, the fixed head 9a is located behind the fixed head 9a in the excavation rotation direction (indicated by an arrow D in FIG. 6). In the concave portion 11 provided on the radially inward side of
The movable head 9b is installed so as to be rotatable about a bit shaft 13.

As a result, also in the bit 7a, the movable head 9b is located at the first position (position shown in FIG. 6) where the movable head 9b overlaps the fixed head 9a when viewed from the end, or the second position where the movable head 9b overlaps the sheet pile 3 when viewed from the end. (Positions shown in FIGS. 5 and 8). That is, the movable head 9b
When the bit 7a is rotated in the reverse direction to the excavation rotation direction, the fixed head 9a is brought into contact with the rear side surface in the excavation rotation direction (the portion indicated by reference numeral 18 in FIGS. 6 and 7) to be in the first position. When the bit 7a is stopped and the bit 7a is rotated in the excavation rotation direction, the fixed head 9a is brought into contact with the side surface (the portion indicated by the reference numeral 19 in FIGS. 6 and 7) on the front side in the excavation rotation direction. Stop at position. The rotation diameter B of the fixed head 9a and the movable head 9b about the axis of the holder 8 is substantially the same as the width of the sheet pile 3.

The method of driving the sheet pile 3 by the excavating tool using the bit 7a and its operation and effect are the same as those in the case where the bit 7 shown in FIGS. 2 to 4 is used. Further, when the bit 7a is used, since the fixed head 9a and the movable head 9b have the same rotation diameter B, the movable head 9a
There is an effect that the excavation can be performed with a good left-right balance as compared with the case where the bit 7 whose rotation diameter b is smaller than the rotation diameter B of the fixed head 9a is used.

The bit 7b shown in FIGS. 8 to 10 forms a fixed head 9a by enlarging a part of the holder 8 and rotates the movable head 9b around the bit shaft 13 at the tip of the holder 8. It is provided freely. The movable head 9b covers the tip of the holder 8, and a part of the movable head 9b is fixed when the movable head 9b assumes the first position.
The diameter of the fixed head 9a is enlarged so as to overlap with the fixed head 9a on the tip side of the fixed head 9a.

Similarly to the bit 7, the movable head 9b is rotated by the action of a stopper (not shown) provided between the fixed head 9a and the movable head 9b. At the first position (the position shown in FIG. 9), and stops at the second position (the position shown in FIGS. 8 and 10) when the bit 7 is rotated in the excavation rotation direction. ing.

Further, a pair of protrusions 12 a are formed on the inner peripheral surface on the distal end side of the shaft hole 12 so as to face each other with the axis of the axial hole 12 interposed therebetween, and the inner peripheral surface on the proximal end side of the bit shaft 13 is formed. , A pair of protrusions 13b are formed to face each other with the axis of the bit shaft 13 interposed therebetween. Here, the protrusion 12
When the bit shaft 13 is inserted into the shaft hole 12, the protrusion 13b fits into a gap formed between the protrusions 12a, and the bit shaft 13 further connects the bit shaft 13 to the shaft hole 12 as shown in FIG. 8 and 12, the relative position and the circumferential width of the protrusion 12a are set so that the end surface of the protrusion 12a and the end surface of the protrusion 13b engage with each other, as shown in FIGS. I have.

Further, the positions of the protrusions 12a and the protrusions 13b are in the state shown in FIG. 12 when the movable head 9b is at the first position or the second position. As a result, the end surface of the protrusion 12a The bit shaft 13 is set in advance so that the bit shaft 13 is prevented from falling out of the shaft hole 12 by engagement of the bit shaft 13 with the tip end surface of the projection 13b.

The method of driving the sheet pile 3 with the excavating tool using the bit 7b and its operation and effect are the same as those in the case where the bit 7 shown in FIGS. 2 to 4 is used. Further, in the bit 7b, in addition to the pin 14, the bit shaft 1 can be also formed by engagement of the end face of the projection 12a with the tip face of the projection 13b.
3 is prevented from falling out of the shaft hole 12, the load applied to the movable head 9b due to the perforation is reduced by the protrusion 12a and the protrusion 13b.
As a result, the load is not concentrated on the pin 14 for locking the bit shaft 13, and the pin 14 is prevented from being damaged or dropped due to stress concentration on the pin 14. can get.

As shown in FIG. 13, a ring 21 rotatable around the axis of the casing 2 can be provided on the casing 2 and the hook 6 can be formed on the ring 21. In this case, since the position of the sheet pile 3 along the circumference of the casing 2 can be changed by rotating the ring 21, excavation can be started without strictly setting the position of the sheet pile 3 with respect to the bit 7 in advance. Alternatively, each time the drilling tool is pulled out, the ring 21 is rotated so that the sheet pile 3 with respect to the bit 7 is rotated.
May be set.

In the above embodiment, the case where the sheet pile 3 is cast as a plate material has been described as an example, but the casing 2 is not affected by the bits 7, 7a and 7b in the first position. Any plate material, such as a C channel material or H steel, can be cast as long as the plate material can be supported.

[0033]

As described above, according to the excavating tool and the method of placing a plate using the same according to the present invention, the plate is inserted into the excavating hole simultaneously with the drilling by the excavating tool.
As compared with the conventional method in which a drilling tool is pulled out from a drilling hole and a plate material is cast, an effect is obtained that the hole wall of the drilling hole is less likely to collapse. Further, since the formation of the excavation hole and the placing of the plate material are performed in a series of operations, the operation is simplified and the operation time is shortened as compared with the conventional method. Furthermore, the excavation tool is inserted into the excavation hole following the excavation tool in a state where the end surface of the plate is covered with the movable head, so that the excavation efficiency is high and the end of the plate is not damaged by the driving. .

[Brief description of the drawings]

FIG. 1 is a side view showing an example of the structure of a drilling tool according to the present invention.

FIG. 2 is a partial cross-sectional view showing an example of a structure of a bit used for a drilling tool according to the present invention.

FIG. 3 is a front view showing an example of the structure of a bit used in the excavating tool of the present invention.

FIG. 4 is a front view showing an example of the structure of a bit used in the excavating tool of the present invention.

FIG. 5 is a partial cross-sectional view showing an example of the structure of a bit used in the excavating tool of the present invention.

FIG. 6 is a front view showing an example of the structure of a bit used in the excavating tool of the present invention.

FIG. 7 is a front view showing an example of the structure of a bit used in the excavating tool of the present invention.

FIG. 8 is a partial cross-sectional view showing an example of the structure of a bit used in the excavating tool of the present invention.

FIG. 9 is a front view showing an example of the structure of a bit used in the excavating tool of the present invention.

FIG. 10 is a front view showing an example of the structure of a bit used in the excavating tool of the present invention.

FIG. 11 is a cross-sectional view along the line XX of FIG. 8 showing the positional relationship between the protrusion and the protrusion in the bit used in the excavating tool of the present invention.

FIG. 12 is a cross-sectional view along the line XX of FIG. 8 showing the positional relationship between the protrusion and the protrusion in the bit used in the excavation tool of the present invention.

FIG. 13 is a side view showing an example of the structure of the excavating tool of the present invention.

[Explanation of symbols]

 Reference Signs List 2 casing 3 sheet pile (plate material) 4 chuck 5 hook 6 hook (second hook) 7, 7a, 7b bit 9a fixed head 9b movable head 11 recess 12 shaft hole 12a protrusion 13 pit shaft 13b protrusion 21 ring

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuyoshi Yoshida 1528 Naka-Nitta, Yokoi, Kobe-cho, Anpachi-gun, Gifu Prefecture Mitsubishi Materials Corporation Gifu Works (72) Inventor Kazuhiro Takagi Kobe-cho, Anpachi-gun, Gifu Prefecture 1528 Nakashinden, Yokoi, Mitsubishi Gifu Works, Mitsubishi Materials Corporation (72) Inventor Koji Nakaishi 1-4-22 Hirohiro, Kure-shi, Hiroshima Pref.Yoshinari Co., Ltd. (72) Hideki Nakaishi, Hirohiro Kure-shi, Hiroshima No. 1-24-2 Hironari, Kosei Co., Ltd. (56) References JP-A-10-238266 (JP, A) JP-A 8-42276 (JP, A) JP-A-3-43519 (JP, A) JP JP-A-61-92216 (JP, A) JP-A-9-31980 (JP, A) JP-A-62-85592 (JP, U) JP-A-63-41641 (JP, U) JP-A-1-136543 (JP) , U) (58) key The field (Int.Cl. ^7, DB name) E21B 4/06 E02D 13/00 E21B 23/00 E21B 23/01 E21B 23/14

Claims (4)

(57) [Claims] 1. A casing having a cylindrical shape and a plate material removably supported on a surface thereof in a longitudinal direction thereof, and a bit disposed on a tip side of the casing and drilling a ground by rotary impact excavation. And, the bit, a holder disposed on the distal end side of the casing, a fixed head provided on the holder so as not to overlap the plate material in an end view, and the holder in the end view, A movable head rotatably supported so as to take a first position overlapping the fixed head or a second position overlapping the plate material when viewed from the end face.
And, when said movable head took the first position, the solid
It is housed in a recess provided inside the fixed head in the radial direction,
In addition, the distal end side of the fixed head
And a front end of the plate material facing the casing.
Is formed, and the plate material is formed from the base material from the base end side.
A chuck to be sandwiched and a distal end portion of the casing toward the distal end.
And a second hook engaged with the hook.
And the second casing is detachably supported by the casing.
A lock is attached to the casing so as to be rotatable around its axis.
Formed on the held ring, the front to said bit
An excavation tool for setting a position of a sheet pile . 2. A shaft hole formed at a tip of the holder,
A bit shaft that supports the movable head is inserted, and a plurality of protrusions are formed at equal intervals along the circumference of the shaft hole on the inner peripheral surface of the shaft hole, and on the surface of the bit shaft. The same number of protrusions as the protrusions are formed at equal intervals along the circumference of the bit shaft, and the bit shaft is inserted into the shaft hole by fitting the protrusions between the protrusions. The bit shaft is supported in the shaft hole at the first and second positions by rotating a base end surface of the protrusion and a front end surface of the protrusion by rotating the shaft. The drilling tool according to claim 1, wherein 3. In a borehole formed in the ground by a drilling tool.
A method for placing a plate material on a digging machine,
The tool has a cylindrical shape, and the plate material can be attached and detached on the surface along the longitudinal direction
A freely supported casing and the tip of this casing
And a bit that is drilled by rotary impact drilling
And the bit is located on the tip side of the casing.
And a holder disposed on the
A fixed head provided so as not to overlap with the plate material;
A first position overlapping the fixed head when viewed from the end
Or take a second position that overlaps the plate material when viewed from the end
A movable head rotatably supported,When the movable head assumes the first position,
It is housed in a recess provided inside the fixed head in the radial direction,
In addition, the distal end side of the fixed head
Become The surface of the plate material facing the casing is
Is formed, and the plate material is formed from the base material from the base end side.
A chuck to be sandwiched, and a shaft
Formed on the ring supported rotatably to the tip
Before setting the position of the sheet pile with respect to the bit
A second hook engaged with the hook,
The chuck is released detachably, and the chuck is released.
By dropping the plate into the borehole by its own weight
Removing the plate from the casing,  Movable with the plate material supported by the casing
After piercing the head as the second position, the movable head
To the first position and forward from the casing.
Remove the plate material and remove only the drilling tool from the drill hole
A method for placing a sheet material, wherein the sheet material is pulled out. 4. A shaft hole formed at a tip of the holder,
A bit shaft that supports the movable head is inserted, and a plurality of protrusions are formed at equal intervals along the circumference of the shaft hole on the inner peripheral surface of the shaft hole, and on the surface of the bit shaft. The same number of protrusions as the protrusions are formed at equal intervals along the circumference of the bit shaft, and the bit shaft is inserted into the shaft hole by fitting the protrusions between the protrusions. The bit shaft is supported in the shaft hole at the first and second positions by rotating a base end surface of the protrusion and a front end surface of the protrusion by rotating the shaft. The method for placing a plate material according to claim 3.