JP2600933Y2 - Shield machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine.

[0002]

2. Description of the Related Art A cutter part of a shield machine such as a muddy water pressurizing machine is usually provided with a main bit and a preceding bit. The leading bit protrudes slightly forward from the main bit to make it easier to excavate by making unevenness (cuts) in the face, and to assist excavation to prevent excessive wear of the main bit. The mud excavated by these cutter bits is taken into slits (openings) formed in the face plate of the cutter part, and is sequentially discharged to the rear of the machine body by a screw conveyor or the like.

[0003]

Problems to be Solved by the Invention By the way, there are cases where buried objects such as driftwood or old foundation piles exist in the stratum to be excavated. In the conventional cutter bit, since a pedestal (matrix) holding a cutting chip is formed independently for each chip, an obstacle is sandwiched between the chips, which adversely affects the cutting function. was there.

In view of the above circumstances, the present invention has been devised in order to provide a shield machine in which a cutting function is not reduced by an underground obstacle.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to the front of the machine body.
A cutter section, and extend the cutter section in the radial direction.
And a front plate that covers between the spokes
In the shield machine equipped with
At least from the cutter spokes in the radial direction
A narrow base is provided, and carbide bits are provided on both sides in the circumferential direction of the base.
And attach the carbide bit in the radial direction
And attach the main bit consisting of a one-character continuum
Configure and dig between the front plate and the cutter spokes
It has a slit to take in the shaved sand . Ma
In addition, the front plate should be
It is preferable to provide a concentric arc-shaped leading bit for cutting the leading bit. So
Then, make the front plate fan-shaped with the cutter spokes
Formed and inclined backward on both sides in the circumferential direction of its front plate,
From the center of the cutter part toward the outside in the radial direction.
It is preferable to continuously provide a tapered plate extending in the circumferential direction.

[0006]

According to the above construction, even if there is an obstacle in the ground, the cutting function is maintained without being caught by the cutter bit. The main bit cuts the target formation uniformly, and the preceding bit cuts into a cylindrical shape prior to this. Also taper
Thus the plate, cut obstacle cutter bit is discharged smoothly incorporated into the slit in the rear.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of the shield machine according to the present invention. In this shield machine, a cutter unit 1 is provided with a continuous cutter bit, and a main bit 2 and a preceding bit 3 are provided as cutter bits.

The cutter unit 1 is provided in front of the machine body 4 in the direction of excavation . The cutter unit 1 has circular spokes (cutter spokes) extending right and left with a phase of 180 degrees.
H) and 5, a front plate 6 covering between the spokes 5 on both sides thereof
Is provided. A frame 8 extending rearward is attached to the center (axial portion) of the spoke 5, and a torque is appropriately transmitted by a cutter driving device (not shown) provided in the machine body 4. I have. The main bit 2 is provided to the diameter shape along the front end of the spokes 5, the front surface
The leading bit 3 is provided on the plate 6 in a concentric arc shape.

The main bit 2 has an inner peripheral side 2a and an outer peripheral side 2a.
b slightly different from each other, but each of the pedestals 9 has a substantially fan-shaped cross section .
Carbide tips 10 and 14 are attached to both corners of 12 without gaps, and the inner portions thereof are reinforced with hardened overlays 11. On the outer peripheral side 2b of the main bit 2, a chip 13,
15 are provided.

The preceding bits 3 are formed in triples at substantially equal intervals from a position near the axis to a position on the outer peripheral edge . Its Resolution <br/> Re preceding bits 3a, 3b, 3c are, as shown in FIG. 5
To, at regular intervals plate-like hard tip 19 of the right-angled triangle the tip of rectangular cross-section of the pedestal 18 in the circumferential direction, for example, provided at 50mm intervals, its plates are filled with hardfacing 20. The tip of the carbide tip 19 slightly protrudes from the hardfacing overlay 20. The leading bit 3 total height _{h 2} is (e.g. 50~100mm than the height _{h 1} of the main bit 2
Degree) projecting (h ₂ > h ₁ ). Further, a plate 21 of a carbide tip is attached to the outer peripheral surface of the leading bits 3a to 3c so as to cover the hardened portion.
The base 18 is also provided with a hardfacing 22 at appropriate intervals.

[0012] In the present embodiment, both sides in the circumferential direction except the axial center portion of the front plate 6, the tapered plate 23 which is inclined rearwardly is al provided. The tapered plate 23 has a substantially triangular shape in a front view, and the front plate 6 has a fan shape. Soshi
Between the taper plate 23 and the spokes 5
A slit 7 for taking in is formed. Also, other leading bits 3b, 3 excluding the innermost leading bit 3a
c extends to a position where its both ends slightly overlap the tapered plate 23. The inclination of the tapered plate 23 is the end 2 of the outer peripheral edge.
4 is the most retracted position.

Next, the operation of this embodiment will be described.

When the cutter unit 1 is rotated by transmitting a rotational force from the cutter driving device, the leading bit 3 cuts ahead of the face, and then the main bit 2 cuts.
The excavated mud enters the slit 7 and is discharged backward. If there is a band-shaped obstacle in the stratum to be excavated,
Particularly, in the case of soft ground, it is difficult to cut, and the cutting bit tends to be entangled. However, the leading bit 3 is cut to the length corresponding to the radial interval by continuously cutting the same position of the obstacle. The cut obstacle enters the slit 7 and is discharged backward together with the excavated mud.

The cut pieces of the obstacle are not entangled in the leading bit 3 or the main bit 2 and there is no excessive adhesion of mud, so that the exposure of the chips 10, 13,. Good excavation can be performed. Also, since the main bit 2 is composed of a single character continuum,
An obstacle can smoothly flow into the unit 7. So
.. 15 of the main bit 2 are connected in the radial direction, and the carbide tips 19 of the preceding bit 3 are connected.
Since a large number of the cutting bits are arranged in the cutting direction (circumferential direction), the wear of the cutter bit is suppressed as a whole, and the durability is improved. In addition, the face of the face has a screw-like inclination according to the rotation speed and the excavation speed, but the taper is
Due to the inclination of the plate 23, the inflow of the mud is not hindered between the front plate 6 and the face, and is smoothly taken into the slit 7 as shown by the broken arrow in FIG.

[0016] The In our present example, it is assumed that by continuously main bit character, may have a shape which interrupted at the position of the axis. The preceding bit is not limited to a triple configuration, but may be a double configuration provided at, for example, an outer peripheral edge and an intermediate position. Further, although the main bit and the preceding bit are formed as a continuum, only one of them may be formed as a continuum.

[0017]

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

[0018] (1) obstacle in place is prevented from being caught in the cutter bit, integrity of the cutting function is achieved.

[0019] (2) durability of the main bit is improved.

[0020] (3) together with the obstacles can be reliably cut, durability of the preceding bit is achieved.

[0021] (4) obstacles to can be incorporated smoothly into the slit.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a shield machine according to the present invention.

FIG. 2 is a side view of FIG.

3 is an enlarged view of a part of the main bit in FIG. 1, (a) is a front view, (b) is a cross-sectional view, and (c) is a side view.

4 is an enlarged view of another part of the main bit in FIG. 1, wherein (a) is a front view, (b) is a cross-sectional view, and (c) is a side view.

5 is an enlarged view of a leading bit of FIG. 1;
Is a front view, (b) is a cross-sectional view, and (c) is a side view.

[Explanation of symbols]

Reference Signs List 1 cutter part 2 main bit 3 leading bit 6 front plate 7 slit 23 taper plate

Continuing on the front page (72) Inventor Shigeo Fujii 11-1 Kitahama-cho, Chita-shi, Aichi Prefecture Ishikawajima-Hari Ma Heavy Industries Co., Ltd. Aichi Factory (72) Inventor Toshiaki Uehara 111-1 Kitahama-cho, Chita-shi, Aichi Ishikawajima-Hari (56) References JP-A-56-16794 (JP, A) JP-A-1-310088 (JP, A) JP-A-1-304298 (JP, A) JP-A-3-38314 (JP, Y2) (58) Field surveyed (Int. Cl. ⁶ , DB name) E21D 9/08

Claims (3)

(57) [Scope of request for utility model registration] 1. A cutter is provided in front of a main body of the machine.
Cutter spokes extending in the radial direction
Machine with a front plate that covers between spokes
In the cutter spoke along the radial direction
At least a pedestal that is narrower than the cutter spokes
Attach carbide bits on both sides of the seat in the circumferential direction and
A series of hard bits are attached continuously in the radial direction,
Construct a main bit consisting of a continuum,
Slit to take excavated earth and sand between cutter spokes
The shield machine characterized by forming . 2. The front plate is preceded by the main bit.
Concentric arc-shaped leading bit for cutting obstacles
The shield machine according to claim 1 . 3. The front plate is bounded by the cutter spokes.
Fan-shaped and inclined rearward on both sides in the circumferential direction of the front plate
And from the center of the cutter part toward the outside in the radial direction.
Claim that a tapered plate that extends in the circumferential direction is continuously provided
Item 3. The shield machine according to item 1 or 2 .