JP5228235B2 - Cutting bit of ground cutting device - Google Patents

Description

The earthing auger provided on the central axis in the steel pipe, the air hammer, the cutting bit provided at the tip of the air hammer, etc. are rotated by a rotating means so that the forward and reverse rotation is possible, and the tip is set at the rear end of the cutting bit. A leading steel pipe connected in a freely rotatable manner and a steel pipe connected thereto are rotatably driven by other rotating means so as to rotate forward and backward, and a tip of the leading steel pipe is provided with a cutting crown bit. In the ground cutting device,

The cutting bit is provided with a cutting bit main body provided with a bit guide portion having a top surface portion, an inclined surface, and a base surface formed on the cutting bit main body, and provided with a front bit portion, a bottom surface portion, and a reduction guide surface. A pair of expansion / contraction bit halves are provided separately, and the pair of expansion / contraction bit halves are configured to be slidable upward along the inclined surface of each bit guide portion of the cutting bit body,
A state where the top surface portion of the cutting bit body and the front bit portion of each expansion / contraction bit half body are aligned, that is, a state where the diameter of the circle formed by the top surface portion and each front bit portion is larger than the outer diameter of the steel pipe, Rotating drive of the cutting bit is provided to cut a hole having a diameter larger than the outer diameter of the steel pipe, and each expansion / contraction bit half body is slid along the inclined surface toward the top surface portion. In a state where the diameter of the formed circle is reduced to be smaller than the inner diameter of the steel pipe, it is pulled back into the steel pipe of the cutting bit, or pulled back into the starting pit and replaced or repaired, or the cutting bit is pulled back into the steel pipe It is equipped to be able to freely machine with the crown bit of
Accordingly, there is provided a cutting bit of a ground cutting device characterized in that various grounds, objects and the like can be freely drilled, drilled, and steel pipes can be freely embedded.

When embedding water and sewage, gas, electricity / telephone lines, and other various pipes in the ground, especially in urban areas, the ground surface, roads, etc. should not be excavated and road traffic blocked. Therefore, usually, a starting vertical pile is provided on the side of a road, etc., and a cutting device is installed in the shaft, and the cutting is buried.
However, in the case of using a cutting device by turning a cutting bit and hitting with an air hammer or a vibration load by a vibration generating device, there is not much problem in cutting normal ground, but for example, soft ground, bedrock, sand layer , Cobblestone layers, alternate layers of the ground, pine piles, concrete piles, liner plates, steel and other buried objects in the ground, and also hit existing human holes (eg manholes, fume pipes, etc.) If this happens, or if branch pipes are installed in existing pipes, manholes, etc., there are issues that are difficult to handle with this crushing type cutting device. In such cases, a crown bit is attached to the leading steel pipe. , It is more suitable to cut with the crown bit, but conventionally, when switching from crushing and cutting with the cutting bit to cutting with the crown bit, A lot of maneuvers are required because the bit, air hammer, auger, etc. and all steel pipes have to be pulled back to the start pit, or the drill bit etc. must be removed by cutting from the ground side to the position of the drill bit. It was time consuming and extremely inefficient.

JP 2001-32666

Therefore, the present invention comprises a turning means for rotating a cutting bit as a cutting means by a crushing method and a striking means for an air hammer, and a rotating means for a steel pipe to which a crown bit is attached as a cutting means by a cutting method. Are provided so that they can be used properly according to the purpose. That is, as the cutting bit used in the cutting device, the cutting bit is cut when the cutting means by the crushing method is used. The top face of the bit body and the front bit part of the pair of expansion / contraction bit halves are aligned and cut larger than the diameter of the steel pipe, and if necessary, the pair of expansion / contraction bit halves are slid and moved to a pair of expansion / contraction bit halves Only the front bit part of the body is aligned and adjusted to be smaller than the diameter of the steel pipe, and the cutting bit is pulled back into the steel pipe (it can be returned to the starting pit and replaced or repaired, etc.). Providing present invention KezuSusumu bits having as can easily switched to the means, in the above manner conventional means is obtained by solving the problem by enabling difficult KezuSusumu any ground.

That is, the present invention provides a earthing auger, an air hammer, and a cutting bit provided at the tip of an air hammer that are rotated on a central axis in a steel pipe so that the cutting bit can be rotated forward and backward by a rotating means. A leading steel pipe that is rotatably connected to the rear end of the bit and a steel pipe connected thereto are rotatably driven by other rotating means so that the forward and reverse rotation is possible. A crown bit for cutting is provided at the tip of the leading steel pipe. In the ground cutting device that is equipped,

From the base of the inclined surface, the cutting bit is formed symmetrically at the center of the tip of the cylindrical cutting bit body provided at the tip of the air hammer, leaving a top surface portion of a set width and being symmetrical with a set angle. A bit guide portion having a base surface formed horizontally in the circumferential direction is provided.

From a semicircular front bit portion of a circle having the same diameter or a small diameter as the plane diameter of the cutting bit body, a bottom surface portion having substantially the same shape and the same size as the base surface, and a body portion having the same height as the bit guide portion Forming a slide surface having the same inclination angle as the inclined surface between the front bit portion and the bottom surface portion of the main body portion, and having a funnel-like shape between the front bit portion and the arcuate side of the bottom surface portion. A pair of expansion / contraction bit halves having a reduced guide surface formed of an arcuate surface;

The guide groove or guide rail provided on each slide surface and the guide rail or guide groove provided on each inclined surface of the bit guide portion are engaged, and each expansion / contraction bit half body is configured to be slidable vertically. And

The base of the cutting bit body of the cutting bit is in contact with the bottom surface of each expansion / contraction bit half body, and the sliding surface of each expansion / contraction bit half body is in contact with each inclined surface of the cutting bit body. A state in which the top surface portion of the bit body and the front bit portion of each expansion / contraction bit half are aligned, that is, the diameter of the circle formed by the top surface portion and each front bit portion is larger than the outer diameter of the steel pipe. To drive a hole with a diameter larger than the outer diameter of the steel pipe by driving

Also, the diameter of the circle formed by sliding each of the expansion / contraction bit halves along the inclined surface of the cutting bit body in the direction of the top surface portion and contacting the straight side of each front bit portion is set to the inner diameter of the steel pipe. As a reduced state, the cutting bit can be pulled back into the steel pipe / starting pit, or the cutting bit can be pulled back into the steel pipe so that the cutting with the crown bit can be performed freely. The feature is solved by the cutting bit of the ground cutting device.

When cutting sewage, gas, waterworks, electric pipes, cobblestones, bedrock layers, etc., while crushing cobblestones, bedrock layers, etc. with a cutting bit by the impact of an air hammer, the soil changes, types of buried objects For example, crushing due to impact may not be possible.
Conventionally, in such a case, the pipe in the middle of cutting was pulled out or dug out from the ground surface side, but the present invention is the top of the cutting bit main body of the cutting bit when cutting by the crushing method. Align the face and each front bit part of the pair of expansion / contraction bit halves to cut larger than the diameter of the steel pipe, slide forward the pair of expansion / contraction bit halves, and each front of the pair of expansion / contraction bit halves Only the bit part is aligned and adjusted to be smaller than the diameter of the steel pipe, and the cutting bit is pulled back into the steel pipe (it can be pulled back to the starting pit and replaced or repaired). Since it is provided so that it can be easily switched, it can be adapted to various grounds, objects, etc. as described above, soil changes, types of buried objects, etc. by appropriately using both the above-mentioned cutting means. , Free and extremely efficient There is an effect.

As described above, the pair of expansion / contraction bit halves are slid forward, only the front bit portions of the pair of expansion / contraction bit halves are aligned and adjusted to be smaller than the diameter of the steel pipe, and the cutting bit is passed through the steel pipe. Since it can be pulled back to the starting pit as it is, the cutting bit can be pulled back to the starting pit as necessary, and the cutting bit, the air hammer, etc. can be easily replaced or repaired.

The cutting bit, air hammer, etc. can be pulled back to the starting pit through the steel pipe and the steel pipe can be emptied, so the hollow of the cutting steel pipe can be used to attach the branch pipe to the existing pipe, and the cutting direction Can be easily measured and corrected.

  FIG. 1 is a partially cut front view of a cutting bit or the like according to an embodiment of the present invention and a leading steel pipe portion provided in an example of a ground cutting device. Example 1   FIG. 2 is a plan view of FIG. Example 1   FIG. 3 shows that by moving the cutting bit back in the direction of the steel pipe, the sliding bit guides of the inner and outer edges of the crown bit of the steel pipe and the reduction guide surface of each expansion / contraction bit half, each expansion / contraction bit half on each inclined surface. It is explanatory drawing of the process which slides in the direction of a top surface part along and reduces the diameter of the circle formed in the front bit part of each expansion-contraction bit half body smaller than the internal diameter of a steel pipe. Example 1   4 completes the operation of FIG. 3 and reduces the diameter of the circle formed by the front bit portion of each expansion / contraction bit half to be smaller than the internal diameter of the steel pipe, It is explanatory drawing of the state pulled back to. Example 1   FIG. 5 is a front view, a plan view, a bottom view, a right side view, and a left side view of an expansion / contraction bit half (the illustration of the planting bit is omitted). Example 1   FIG. 6 is a diagram showing a schematic configuration of one example of a ground cutting device using the cutting bit of the present invention.

In the ground cutting device, the cutting bit 1 is provided with a cutting bit body 3 provided with a bit guide portion 7 having a top surface portion 4, an inclined surface 5, and a base surface 6, and a front bit portion 8, a bottom surface. A pair of expansion / contraction bit halves 13 provided with a portion 9 and a reduction guide surface 12 are provided separately, and each of the expansion / contraction bit halves 13 is located above the inclined surface 5 of each bit guide portion 7 of the cutting bit body 3. A grounding bit for a ground grinding device that is slidably configured.

FIG. 6 is a diagram showing a schematic configuration of one example of a ground cutting device using the cutting bit of the present invention.

An example of a ground cutting device using the cutting bit of the present invention is a earth removal auger 14 provided on the central axis in the steel pipes 15, 16, an air hammer 2, and a cutting bit provided at the tip of the air hammer 2. 1 is rotated by a rotating means so that it can be rotated forward and backward, and a leading steel pipe 15 whose tip is rotatably connected to the rear end of the cutting bit 1 and a steel pipe 16 connected thereto can be rotated forward and backward by other rotating means. And a crown bit 17 for cutting is provided at the tip of the leading steel pipe 15.

In FIG. 6, A is a rotating means, B is a rotating means, C is a central axis, 20 is a start shaft, 21 is a mounting plate, 22 is a ground, 23 is a motor, 24 is a gear, 25 is a discharge hole, and 26 is a discharge hole. A propulsion base, 27 is a base, 28 is a propulsion means, 29 is a transit, and 30 is a target.

FIG. 1 is a partially cut front view of a cutting bit according to an embodiment of the present invention prepared for an example of a ground cutting device and a steel pipe portion at the top,
2 is a plan view of FIG.
FIG. 3 shows that by moving the cutting bit back in the direction of the steel pipe, the sliding bit guides of the inner and outer edges of the crown bit of the steel pipe and the reduction guide surface of each expansion / contraction bit half, each expansion / contraction bit half on each inclined surface. An explanatory view of the process of sliding in the direction of the top surface portion along the circle and reducing the diameter of the circle formed by the front bit portion of each expansion / contraction bit half to be smaller than the inner diameter of the steel pipe,
4 completes the operation of FIG. 3 and reduces the diameter of the circle formed by the front bit portion of each expansion / contraction bit half to be smaller than the internal diameter of the steel pipe, Explanatory drawing of the state pulled back to
FIG. 5 is a front view, a plan view, a bottom view, a right side view, and a left side view of an expansion / contraction bit half (the illustration of the planting bit is omitted).

The cutting bit 1 is symmetrically formed with an inclined surface 5 of a set angle left and right, leaving a top surface portion 4 having a set width at the center of the tip of a cylindrical cutting bit body 3 provided at the tip of the air hammer 2. A bit guide portion 7 having a base surface 6 formed horizontally in the circumferential direction from the base portion of the surface 5 is provided (FIG. 1).

A semicircular front bit portion 8 having the same or smaller diameter than the plane diameter of the cutting bit body 3, a bottom surface portion 9 that is substantially the same shape and size as the base surface 6, and the bit guide portion 7. The main body portion 10 is formed with a slide surface 11 having the same inclination angle as that of the inclined surface 5 between the front bit portion 8 and the bottom surface portion 9 on the main body portion 10, and the front bit portion 8 and the bottom surface. An expansion / contraction bit half body 13 having a reduction guide surface 12 formed of a funnel-shaped arc surface is separately provided between the arc-shaped sides of the portion 9 (FIGS. 1 and 5).

The guide rails 18 provided on the inclined surfaces 5 of the bit guide portion 7 and the guide grooves 19 provided on the slide surfaces 11 of the expansion / contraction bit halves 13 are engaged with each other so that the expansion / contraction bit halves 13 can slide up and down. It is configured to prepare for. (Fig. 1 and Fig. 5)
The guide rail 18 may be provided on each slide surface 11 of the expansion / contraction bit half body 13, and the guide groove 19 may be provided on each inclined surface 5 of the bit guide portion 7.

The bottom surface 9 of each expansion / contraction bit half body 13 is brought into contact with each base surface 6 of the cutting bit body 3 of the cutting bit 1, and each expansion / contraction bit half body 13 slides on each inclined surface 5 of the cutting bit body 3. A state in which the top surface portion 4 of the cutting bit body 3 and the front bit portion 8 of each expansion / contraction bit half body 13 are aligned, that is, the circle formed by the top surface portion 4 and each front bit portion 8 is brought into contact with the surface 11 The diameter is set to be larger than the outer diameter of the steel pipes 15, 16, and the drill bit 1 is driven so that a hole larger in diameter than the outer diameter of the steel pipes 15, 16 is advanced (FIG. 1)

Further, each of the expansion / contraction bit halves 13 is slid along the inclined surface 5 of the cutting bit body 3 in the direction of the top surface portion 4 and a circle formed by contacting the straight side of each front bit portion 8. With the diameter reduced to be smaller than the inner diameter of the steel pipes 15 and 16, the cutting bit 1 was pulled back into the steel pipes 15 and 16 or the start shaft 20, or the cutting bit 1 was pulled back into the steel pipes 15 and 16. This is a cutting bit of a ground cutting device that can be freely cut by the crown bit 17 in a state. (Fig. 1, Fig. 3)

Means for reducing the diameter of the circle formed by contacting the straight side of each of the front bit portions 8 to be smaller than the inner diameter of the steel pipes 15 and 16 and pulling the cutting bit 1 back into the steel pipes 15 and 16; More specifically, when the cutting bit 1, the air hammer 2, the earth discharging auger 14, etc. are moved back in the direction of the starting pit 20 by the propulsion means 7, each of the expansion / contraction bit halves 13 on the cutting bit body 3 is The reduction guide surface 12 collides with the inner peripheral edge of the upper end of the crown bit 17 of the steel pipe 15, and each reduction guide surface 12 contacts and slides against the inner peripheral edge, and at the same time, each expansion / contraction bit half 13 is provided on each slide surface 11. Each inclined surface 5 is moved in the direction of the top surface portion 4 by the sliding guide of the guide rail 18 provided on each inclined surface 5 of the guide groove 19 and the cutting bit body 3, and then each front surface of each expansion / contraction bit half body 13. The straight side of the bit portion 8 comes into contact with the steel pipe 15, Diameter circle than the inner diameter of 6 is formed, and then, in which KezuSusumu bit is pulled back to the inside of the steel pipe 15, 16. (FIGS. 1 to 2 to 3)

"Crushing means by crushing method" (see Fig. 1)
The rotating means B is operated to remove the earth discharging auger 14, the air hammer 2, and the cutting bit 1 (the state in which the diameter of the circle formed by the top surface portion 4 and each front bit portion 8 is larger than the outer diameter of the steel pipes 15 and 16). Simultaneously with the rotation, the rotating means A is operated to reversely rotate the mounting plate 21 and the steel pipes 15 and 16, and the grounding is performed by the impact force of the cutting bit 1 by the air hammer 2 at the same time as the cutting bit 1 rotates. 22 is crushed and machined (23 is motor, 24 is gear),

The excavation generated by excavation is introduced into the steel pipes 15 and 16 from the excavation hole of the cutting bit 1 and transferred rearward by the excavation auger 14 to be discharged to the outside through the discharge holes 25 at the rear end of the steel pipes 15 and 16. At the same time, the reverse rotation of the steel pipes 15 and 16 assists the soil transfer action of the soil auger 14,

Further, along with the advancement of the cutting bit 1, the forward impact force is received by the crown bit 17 from the flange of the cutting bit 1, the front steel pipe 15 is pulled forward, and the steel pipe 16 and the mounting plate 21 connected thereto are advanced together. .

"Cutting means by cutting method" (see Fig. 3)
Depending on the ground conditions, the cutting bit 1 (the state in which the diameter of the circle formed by each front bit portion 8 is reduced to be smaller than the inner diameter of the steel pipes 15, 16) is pulled back into the leading steel pipe 15, and then the crown bit Cutting is performed with 17 rotations.

In synchronism with the cutting of the cutting bit 1 and the advance of the steel pipes 15 and 16, the base 27 on the propulsion base 26 is further pressurized and propelled by the propulsion means 28 such as a hydraulic cylinder, and the bedrock, cobblestone, etc. The unfavorable ground 22 is advanced and the steel pipes 15 and 16 are buried.

By properly using the “crushing means by the crushing method” and the “cutting means by the cutting method”, it is possible to carry out any unfavorable ground such as bedrock, cobblestone, gravel and the like, and ground below the surface of the water.
The ground cutting device is not limited to the embodiment device, and can be widely used for a device having an equivalent function and capable of using the cutting bit of the present invention.

A rotating means B rotating means C central axis,
DESCRIPTION OF SYMBOLS 1 Cutting bit 2 Air hammer 3 Cutting bit main body 4 Top surface part 5 Inclined surface 6 Base surface 7 Bit guide part 8 Front bit part 9 Bottom face part 10 Body part 11 Slide surface 12 Reduction guide surface 13 Expansion bit half body 14 Excavation Auger 15 steel pipe (top)
16 Steel pipe 17 Crown bit 18 Guide rail 19 Guide groove 20 Starting pit 21 Mounting plate 22 Ground 23 Motor 24 Gear 25 Discharge hole 26 Propulsion base 27 Base 28 Propulsion means 29 Transit 30 Target

Claims (2)

The earth removal auger, air hammer, and cutting bit provided at the tip of the air hammer are driven to rotate forward and backward by rotating means, and the tip rotates to the rear end of the cutting bit. A ground pipe comprising a freely connected leading steel pipe and a steel pipe connected to the steel pipe so as to be rotated in a forward / reverse direction by other rotating means, and a crown bit for cutting is provided at the tip of the leading steel pipe In the cutting device of
The cutting bit is provided with a cutting bit body provided with a bit guide portion having a top surface portion, an inclined surface, and a base surface, and a pair of expansion / contraction bits half provided with a front bit portion, a bottom surface portion, and a reduction guide surface. The body is separately provided, and the pair of expansion / contraction bit halves are configured to be slidable in the direction of the top surface along the inclined surface of each bit guide portion of the cutting bit body,
Cutting bit of ground cutting device. The earth removal auger, air hammer, and cutting bit provided at the tip of the air hammer are driven to rotate forward and backward by rotating means, and the tip rotates to the rear end of the cutting bit. A ground pipe comprising a freely connected leading steel pipe and a steel pipe connected to the steel pipe so as to be rotated in a forward / reverse direction by other rotating means, and a crown bit for cutting is provided at the tip of the leading steel pipe In the cutting device of
From the base of the inclined surface, the cutting bit is formed symmetrically at the center of the tip of the cylindrical cutting bit body provided at the tip of the air hammer, leaving a top surface portion of a set width and being symmetrical with a set angle. A bit guide portion having a base surface formed horizontally in the circumferential direction, and a semi-circular front bit portion having a diameter the same as or smaller than the plane diameter of the cutting bit body, and substantially the same shape as the base surface A bottom surface portion of the same size and a main body portion having the same height as the bit guide portion, and a slide surface having the same inclination angle as the inclined surface is formed between the front bit portion and the bottom surface portion of the main body portion. A pair of expansion / contraction bit halves formed with a reduction guide surface composed of a funnel-shaped arc surface between the front bit part and the arcuate side of the bottom part,
The guide groove or guide rail provided on each slide surface and the guide rail or guide groove provided on each inclined surface of the bit guide portion are engaged, and each expansion / contraction bit half body is configured to be slidable vertically. And
The base of the cutting bit body of the cutting bit is in contact with the bottom surface of each expansion / contraction bit half body, and the sliding surface of each expansion / contraction bit half body is in contact with each inclined surface of the cutting bit body. A state in which the top surface portion of the bit body and the front bit portion of each expansion / contraction bit half are aligned, that is, the diameter of the circle formed by the top surface portion and each front bit portion is larger than the outer diameter of the steel pipe. It is provided to cut a hole having a diameter larger than the outer diameter of the steel pipe by the rotational drive of, and slide each expansion / contraction bit half body in the direction of the top surface along each inclined surface of the cutting bit body, With the diameter of the circle formed by abutting the straight side of each front bit part reduced to be smaller than the inner diameter of the steel pipe, the cutting bit is pulled back into the steel pipe / starting pit, or the cutting bit is put into the steel pipe. It was prepared to be able to perform cutting with a crown bit in the state pulled back to The butterfly,
A cutting bit of the ground cutting device according to claim 1.

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