JP3248885B2 - Cutting machine for 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 cutting machine for a shield machine, and more particularly, to a passage for passing a protrusion protruding from the outer periphery of a trunk member on a relatively hard nomst wall forming a starting shaft or the like. The present invention relates to a cutting device for a shield machine for cutting a groove.

[0002]

2. Description of the Related Art Conventionally, a shield excavator that excavates a tunnel and sequentially lining the inner surface of the tunnel with a segment includes a trunk member and a cutter disk rotatably supported at a tip end of the trunk member. And an erector device for assembling the segments, a simultaneous back-filling device for injecting a caking agent between the inner surface of the ground of the tunnel and the assembled segments, and a tail seal grease for the tail seal portion of the body member. A tail seal grease injection device or the like for injection is provided.

In this type of shield machine, a segment for lining the inner surface of the tunnel is assembled along the inner peripheral surface of the trunk member inside the rear end portion of the trunk member. The piping system of the simultaneous backfill injection device and the piping system of the tail seal grease injection device provided at the end cannot be attached to the inner surface side of the trunk member, and these piping systems are located on the outer periphery of the trunk member. It is a protruding projection.
As disclosed in Japanese Patent Application Laid-Open Nos. 9-100696 and 10-37679, a shield excavator having such a protrusion is provided with a cutting machine for cutting a passage groove for allowing the protrusion to pass through during excavation. A device has been proposed.

Meanwhile, in a starting shaft where excavation is started by a shield excavator and a reaching shaft where excavation is finished, a vertical sealing wall made of concrete is constructed, and a chemical solution is injected into the ground facing the sealing wall. After the ground improvement, a technique is generally used in which a passage opening is formed in the sealing wall to start and reach the shield machine. However, since a concrete sealing wall cannot be cut with a cutter disk of a shield machine, a cutting work by an operator is required, and a work load is increased.

Therefore, recently, in a starting shaft and a reaching shaft, a portion of a sealing wall of a passage opening through which a shield excavator passes is constituted by a nomust member which can be cut by a cutter disk, and the nomust member is formed by a cutter disk. The shield excavator starts while forming
Nomust construction method to reach is practically used.

The nomust member which can be cut with a cutter disk is made of a new material concrete in which rope-shaped carbon fiber is solidified with mortar. You can start and reach. Therefore, the cutting work by the operator can be omitted, and the outer peripheral side of the shield machine that is passing through the passage opening through the packing provided on the sealing wall side can be sealed, so that earth and sand and muddy water can be prevented from flowing in, There is no need to inject chemicals into the ground to improve the ground.

[0007] Here, a projection including a binder and a pipe for injecting grease is usually provided on the outer peripheral portion of the shield machine. When the passage opening is cut, the projection is formed. It is necessary to cut the passage groove for passing. It is desirable that the cross-sectional shape of this passage groove be a gentle mountain shape so that the packing on the sealing wall side can be deformed following. Various cutting devices for cutting the passage groove have been proposed.

For example, the cutting device disclosed in Japanese Patent Application Laid-Open No. 9-100696 has a large number of cutting bits disposed on the outer periphery of a trunk member ahead of a projection in the direction of excavation. The cutting bits are arranged and fixed in a plurality of stages at appropriate intervals in the direction, and the height of the cutting bit gradually increases from the front stage to the rear stage. The plurality of cutting bits in each stage are arranged in a mountain shape in plan view such that the center one is located forward. A large number of cutting bits of the cutting device have a gentle mountain shape that becomes higher toward the center line side of the projection in a front view. In other words, this cutting device cuts a passage groove having a gentle mountain-shaped cross section by cutting wide and shallow at first, and cutting narrower and deeper as it goes to a later stage.

On the other hand, Japanese Patent Application Laid-Open No. Hei 10-37679 discloses a rotary cutter disposed forward of a projection.
A cutting device (excavation device) having a rotation drive mechanism for rotating and driving the rotary cutter and a switching mechanism for switching the position of the rotary cutter is described, wherein the switching mechanism includes at least a part of the rotary cutter having a body member. The position can be switched between an excavation position protruding from the outer peripheral surface and a retreat position at which the rotary cutter retreats from the outer peripheral surface of the body member.
According to this cutting device, during the shield excavation, when the rotary cutter is rotationally driven by the rotary drive mechanism, and the rotary cutter is switched to the excavation position by the switching mechanism, the passage for passing the protrusion with the rotary cutter is performed. Grooves can be cut.

[0010]

[Problems to be Solved by the Invention]
In the cutting device for a shield machine described in Japanese Patent Publication No. 96, since the cutting bits are arranged so as to be higher from the front stage to the rear stage, most of the cutting bits other than the plurality of cutting bits at the foremost stage are cut only at the tip. Therefore, the cutting amount of each cutting bit is small, and a large number of cutting bits must be provided as a whole, and the cutting bit is expensive, so that the manufacturing cost of the cutting device becomes high. .

Further, the earth and sand cut by the cutting device is not discharged into the shield machine, but must be released to the side of the protrusion on the outer peripheral side of the shield machine. Since the cutting device cuts widely and shallowly from the beginning and gradually increases the cutting depth, it is difficult for the cut pieces to escape to the side, cutting is likely to be wasted, and the durability of the cutting bit tends to decrease. .

In the cutting device for a shield machine described in Japanese Patent Application Laid-Open No. 10-37679, the cutting device itself is complicated. The passage groove cut by the rotary cutter has a substantially rectangular shape instead of a gentle mountain shape when viewed from the front, so the sealing performance of the packing on the sealing wall side deteriorates, and mud and muddy water reach the starting shaft and It becomes easier to flow into the shaft.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cutting device for forming a passage groove for allowing a projection projecting from an outer peripheral portion of a trunk member of a shield machine to pass therethrough, and to reduce the manufacturing cost of the cutting device. Securing durability, improving the flow of cutting pieces to enhance cutting performance, and the like.

[0014]

According to a first aspect of the present invention, there is provided a cutting machine for a shield machine, wherein the cutter machine is provided while rotating a cutter disk provided at a front end of the shield machine, and a protrusion protruding from an outer peripheral portion of a trunk member. In a shield excavator provided with a cutting device for cutting a passage groove for passing through the body member, the cutting device is disposed ahead of the projection in the excavation direction and the axis of the shield excavator. A plurality of cutting bits arranged in a plurality of stages in the direction, and the plurality of cutting bits are arranged in at least two rows on both sides of the center line such that the rearmost bit is closer to the center line of the projection as a whole. The plurality of cutting bits are arranged, and the front cutting bit and the preceding cutting bit are arranged at least at the rear part of each row in a gentle mountain shape that is higher toward the center line side of the protrusion in a front view viewed from the front in the excavation direction. A plurality of sets of two-stage cutting portions that cut the substantially same portion with respect to the center line in two steps with a subsequent cutting bit that is higher than the preceding cutting bit and a subsequent cutting bit are provided . , The cut pieces to the side
It has a horizontal rake angle and a relief angle for facilitating escape .

The protrusion protruding from the outer periphery of the body member is
For example, a piping system of a simultaneous back-filling injection device or a piping system of a tail seal grease injection device. When starting from the starting shaft, digging in the tunnel, reaching the reaching shaft, etc., in parallel with the shield excavation, by the cutting device,
It is possible to cut a passage groove for allowing the projection projecting from the outer periphery of the body member to pass therethrough. The plurality of cutting bits are arranged in at least two rows on both sides of the center line such that the rearmost bit is closer to the center line of the protrusion as a whole, and generally,
The height of the rear cutting bit is larger.

Therefore, by the plurality of cutting bits on the front stage side,
The portion of the passage groove far from the center of the protrusion is shallowly cut into two streaks, and then the center part adjacent to the cut portion is cut into two streaks by the cutting bit that follows it. Cut a little deeper and repeat this one by one to cut a gentle mountain-shaped passage groove in front view. Since it is only necessary to provide at least two cutting bits as the cutting bits for each stage, the total number of cutting bits in the cutting device can be reduced. Then, the cut pieces easily flow in the direction away from the center line, cutting waste is reduced, and the durability of the cutting bit is also improved.

In view of the fact that the cutting depth increases and the load on the cutting bit increases at least at the rear of each row,
At least at the rear part of each row, a plurality of cutting steps for cutting substantially the same part with respect to the center line in two steps with a preceding cutting bit and a succeeding cutting bit succeeding and taller than the preceding cutting bit. A set of two-stage cuts is provided. Therefore, the load on each cutting bit of the two-stage cutting portion can be reduced, and the durability thereof can be secured. In particular, each cutting bit
Is a horizontal rake to make it easier for the cut pieces to escape to the side.
Since the cut piece has a clearance angle and a clearance angle, the cut piece flows laterally.
Can reduce the cutting force.
it can.

According to a second aspect of the present invention, there is provided a cutting machine for a shield machine.
In the invention of claim 1, each of the cutting bits is further vertically
The present invention is characterized by having a rake angle . All cutting bits other than the succeeding cutting bits in the two-stage cutting section will contribute to the cutting on the entire front surface, but each cutting bit has a horizontal rake angle and a clearance.
Because having a further vertical rake angle and corner cutting performance that a high addition <br/>.

According to a third aspect of the present invention, there is provided a cutting machine for a shield machine.
The invention according to claim 1 or 2, wherein the cutting edge forming portion of each of the cutting bits is formed of a carbide tip. Hard rock and nomust members can be cut through the carbide tips, and the durability of the cutting bit can be increased.

The cutting device for a shield machine according to claim 4 is
The invention according to any one of claims 1 to 3, wherein the protrusion is
It is a piping system of a simultaneous back-filling device for injecting a consolidating agent between the inner surface of the ground of the tunnel and the segment, and its cover. By cutting the passage groove having a cross section larger than the cover cross section by the cutting device, it is possible to reliably prevent the piping system of the simultaneous backfilling device from being damaged.

According to a fifth aspect of the present invention, there is provided a cutting machine for a shield machine.
The invention according to any one of claims 1 to 3, wherein the protrusion is
It is a piping system of a tail seal grease injection device for injecting tail seal grease into a tail seal portion of a body member, and a cover thereof. By cutting the passage groove having a cross section larger than the cover cross section with the cutting device, it is possible to reliably prevent the piping system of the tail seal grease injection device from being damaged.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. The cutting device according to the present embodiment is a shield excavator that excavates a tunnel while rotating a cutter disk supported on a tip end portion of a cylindrical trunk member and sequentially lining the inner surface of the excavated tunnel with segments. Applied. First, the shield machine will be briefly described, and then the cutting device will be described.

As shown in FIG. 1, the shield machine 1
It has a body member 2 propelled in the excavation direction by a plurality of shield jacks, and a tip end of the body member 2 rotatably supports a cutter disk 4 to which a plurality of cutter bits 3 are attached. A chamber capable of accommodating excavated soil excavated by the cutter disk 4 is formed at a tip portion of the body member 2. Although not shown, a rotation drive mechanism for rotating the cutter disk 4, a soil discharging device including a screw conveyor, an erector device for assembling the segments, and the like are provided inside the body member 2.

As shown in FIGS. 1 and 2, a plurality of solidifying agents, such as mortar, are provided between the assembled segment and the inner surface of the ground of the tunnel at a plurality of circumferential locations at the rear portion of the outer peripheral portion of the body member 2. System 5a of simultaneous back-filling injection device 5 for injecting
The cover 6 covering the piping system 5a forms a projection 7 projecting from the outer periphery of the body member 2 and parallel to the tunnel axis.

Next, a description will be given of a cutting device 8 for cutting a passage groove through which the projection 7 passes. As shown in FIGS. 2 to 4, the cutting devices 8 are fixed to the body member 2 in the excavation direction ahead of the projections 7 by welding or the like, and are arranged in a plurality of stages in the axial direction of the shield excavator 1. Many cutting bits 9
It is composed of The plurality of cutting bits 9 have a substantially V-shape in plan (side view) as a whole, that is, the center line CL is closer to the center line CL of the protruding portion 7 as it is rearward.
It is arranged in two rows on both sides of the CL. The large number of cutting bits 9 are provided with protrusions 7 in front view when viewed from the front in the digging direction.
Of the projection 7 is slightly larger than the cover 6 of the projection 7 when viewed from the front.

As shown in FIGS. 2 to 4, at least at the rear of the cutting device 8 in the two rows of cutting bits 9 in the cutting device 8, preceding cutting bits 11 a to 16 a and succeeding and succeeding adjacent cutting bits 11 a to 16 a. Advance cutting bits 11a to 16a
The tall subsequent cutting bits 11b to 16b are provided with ten sets of two-stage cutting portions 11 to 16 for cutting the substantially same portion in two steps with respect to the center line CL. That is, FIG.
As shown in FIG.
As for 10f, it is arranged so that the rear part is closer to the center line of the projection 7, and the rear cutting bit is formed to have a higher height.

In the rear portion of each row other than the portion near the rear end, four sets of two-stage cutting portions 11 to 14 arranged in four stages are provided.
3 is provided near the rear end of the upper row in FIG. 3, and a set of two-step cutting parts 15 is provided at the rear end of the lower row in FIG. 3. A part 16 is provided. The two-stage cutting portions 11 to 16 are arranged so that the rearward one approaches the center line CL, and the two-stage cutting portion 16 is arranged on the center line CL. Two-stage cutting parts 11-16
Are a pair of cutting bits 11a, 11b, 12a, 12 for cutting a substantially same portion in two steps with respect to the center line CL, respectively.
b, 13a, 13b, 14a, 14b, 15a, 15
b, 16a, 16b, each two-stage cutting portion 11 to
In 16, the cutting bits 11b to 16b on the rear side are formed higher than the cutting bits 11a to 16a on the front side.

Next, the cutting bit 9 will be described. As shown in FIG. 5, each cutting bit 9 has a vertical rake angle α and a clearance angle β in a side view, and has a horizontal rake angle γ in a plan view. The vertical rake angle α is set to about 10 to 15 degrees, the clearance angle β is set to about 5 to 10 degrees, and the horizontal rake angle γ is set to about 30 to 45 degrees. Further, the cutting edge forming portion of each cutting bit 9 is constituted by a cemented carbide tip T. The cemented carbide tip T includes a cemented carbide tip Tv forming a portion having a vertical rake angle α and a portion having a horizontal rake angle γ. And a carbide tip Th that forms

Next, a starting shaft for starting the shield machine 1 and a reaching shaft for taking out the shield machine to the outside will be briefly described using the starting shaft 20 as an example. As shown in FIG. 6, a concrete base 21 is constructed in the starting shaft 20, and a cylindrical concrete wall 22 rising from the base 21 and a cylindrical concrete wall 22.
And a vertical wall 23 erected between the ground G and the ground G form a sealing wall 24.

The cylindrical concrete wall 22 is formed with a substantially circular opening 22a slightly larger than the outer peripheral portion of the shield machine 1. When the shield machine 1 starts, muddy water and mud of the ground G are moved to the start shaft 20. Opening 22a so as not to flow into
An entrance packing 25 for sealing between the inner surface of the opening 22a and the outer peripheral portion of the shield machine 1 is attached to the inner surface of the opening. The vertical wall 23 is constructed by connecting a plurality of elongated sealing members 26 in the width direction. A portion of the vertical wall 23 where an opening for passing the shield machine 1 is formed is formed of rope-shaped carbon fiber. It is a nomust member 28 that is hardened with mortar and that can be cut by the cutter disk 4.

Next, the operation of the shield machine 1 will be described. The cutting device 8 of the shield machine 1 has a large number of cutting bits 9 when starting from the starting shaft 20, when shielding the shield shaft using the shield machine 1, or when reaching the reaching shaft from the shield shaft. Accordingly, the nomust member 28 and the ground are cut to cut the passage groove 7a (see FIG. 4) through which the protrusion 7 passes.

When the cutting device 8 cuts the passage groove 7a, a part of the passage groove 7a far from the center CL of the projection 7 is formed by two strips by the plurality of cutting bits 10a on the front end side. Then, the portion on the side of the center CL adjacent to the already-cut portion is cut a little deeper into two streaks by the cutting bits 10b, 10b following the rear portion. Through 10f, and then sequentially through the rear two-stage cutting sections 11 to 16 to form a gentle mountain-shaped passage groove 7 that is gentle in front view.
Cut a.

Since it is only necessary to provide at least two cutting bits 9 as the cutting bits 9 for each stage, the total number of cutting bits 9 in the cutting device 8 can be reduced. Then, the cut pieces easily flow in the direction away from the center line CL, cutting waste is reduced, and the durability of the cutting bit 9 is also improved.

In view of the fact that the cutting depth increases and the load on the cutting bit 9 increases at least at the rear part of each row, at least the rear part of each row has the preceding cutting bits 11a to 11a.
16a and the succeeding cutting bit 11b-1 adjacent thereto and succeeding and being taller than the preceding cutting bit 11a-16a.
6b, there are provided ten sets of two-stage cutting portions 11 to 16 for cutting the substantially same portion in two stages with respect to the center line CL. Therefore, each cutting bit 9 of the two-stage cutting portions 11 to 16
(11a, 11b,..., 16a, 16b) can be reduced and its durability can be ensured.

Each of the cutting bits 9 has a vertical rake angle α, a clearance angle β, and a horizontal rake angle γ, so that the subsequent cutting bits 11b to 16b in the two-stage cutting units 11 to 16
All the cutting bits 9 except for the entire front surface thereof contribute to the cutting. However, since each cutting bit 9 has a vertical rake angle α, a clearance angle β, and a horizontal rake angle γ, the cutting performance is improved. Moreover, the flow of the cutting piece to the side can be made smooth by the clearance angle β, and the cutting resistance can be reduced. In addition, since the cutting edge forming portion of each cutting bit 9 is made of the carbide tip T, the hard rock or the nomust member 28 can be cut through the carbide tip T, and the durability of the cutting bit 9 is improved. Can be.

Next, a modified embodiment in which the above-described embodiment is partially modified will be described. 1) In the above-described embodiment, the cutting device 8 in which a large number of cutting bits 9 are arranged in substantially two rows in a V-shape has been described as an example, but a plurality of cuttings are further provided inside the two rows at the front of the cutting device 8. The bit 9 may be arranged in a V shape. 2) In the above-described embodiment, the case of the cutting device 8 that cuts the passage groove 7a through which the projecting member 7 formed of the pipe system and the cover of the simultaneous backfilling device 5 passes is described as an example, but the tail seal of the trunk member 2 is described. The present invention is similarly applicable to a piping system of a tail seal grease injection device for injecting tail seal grease into a portion and a cutting device 8 for cutting a passage groove 7a through which a projection 7 formed of a cover thereof passes. 3) The embodiment is merely an example, and it goes without saying that the embodiment can be implemented in a form in which various changes are added to the jerk form without departing from the spirit of the present invention.

[0037]

According to the first aspect of the present invention, as described in the description of the operation, a plurality of cutting bits on the front stage side form a portion of the passage groove that is far from the center of the protruding portion by two. Cut shallowly in the shape of a streak, and then cut a bit deeper in the center side adjacent to the cut portion with a cutting bit that follows on the back side, and repeat this in order, It is possible to cut a gentle mountain-shaped passage groove visually. Since it is only necessary to provide at least two cutting bits as cutting bits for each stage, the total number of expensive cutting bits in the cutting device can be reduced, and the manufacturing cost of the cutting device can be reduced. Then, the cut pieces easily flow in the direction away from the center line, cutting waste is reduced, and the durability of the cutting bit is also improved.

In view of the fact that the cutting depth increases and the load on the cutting bit increases at least at the rear of each row,
At least at the rear part of each row, a plurality of cutting steps for cutting substantially the same part with respect to the center line in two steps with a preceding cutting bit and a succeeding cutting bit succeeding and taller than the preceding cutting bit. Because two sets of cutting parts are provided,
The load on each cutting bit of the two-stage cutting part can be reduced, and its durability can be ensured. In particular, each cutting bit
A horizontal rake angle to make the cut pieces easier to escape to the side
With the clearance angle, the flow of the cut piece to the side is circular.
Can be smooth, can reduce the cutting force
You.

According to the second aspect of the present invention, all the cutting bits other than the succeeding cutting bits in the two-stage cutting portion contribute to the entire front surface of the cutting bits, but each cutting bit has a horizontal rake angle. because having a a clearance angle further vertical rake angle, cutting performance that a further higher. The other effects are the same as those of the first aspect.

According to the third aspect of the present invention, since the cutting edge forming portion of each of the cutting bits is formed of a carbide tip, it is possible to cut a hard rock or a nomst member through the carbide tip. , The durability of the cutting bit can be increased. The other effects are the same as those of the first or second aspect.

According to the fourth aspect of the present invention, the protrusion is
Because it is a piping system and a cover of a simultaneous backfill injection device that injects a consolidation agent between the ground surface of the tunnel and the segment,
By cutting the passage groove having a cross section larger than the cross section of the cover by the cutting device, it is possible to reliably prevent the piping system of the simultaneous backfilling device from being damaged. Other effects similar to those of any one of the first to third aspects are exhibited.

According to the fifth aspect of the present invention, the protrusion is
Since the tail seal grease is injected into the tail seal part of the body member and the piping system of the tail seal grease injection device and its cover, the cutting device cuts a passage groove having a cross section larger than the cross section of the cover, so that the tail is removed. The piping system of the seal grease injection device can be reliably prevented from being damaged.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional side view of a main part of a shield machine and a cutting device.

FIG. 3 is an enlarged plan view of a cutting device and a main part of a protrusion.

4 is a front view of a main part of the cutting device (a view taken along the line IV-IV in FIG. 3).

5A is a side view of a cutting bit, FIG. 5B is a front view of the cutting bit, FIG. 5C is a plan view of the cutting bit, and FIG. 5D is a front view of two cutting bits.

FIG. 6 is a schematic sectional view of a main part of a starting shaft and a shield machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Body member 4 Cutter disk 5 Simultaneous back-filling injection device 5a Piping system 6 Cover 7 Projection part 7a Passing groove 8 Cutting device 9, 10a-10f Cutting bit 11-16 Two-stage cutting part 11a-16a Preceding cutting bit 11b-16b Subsequent cutting bit α Vertical rake angle β Clearance angle γ Horizontal rake angle T, Tv, Th Carbide insert

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-100696 (JP, A) JP-A-9-291786 (JP, A) JP-A-11-81877 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) E21D 9/08 E21D 9/06 301

Claims (5)

(57) [Claims] 1. A cutting device for digging while rotating a cutter disk provided at a front end portion of a shield excavator and cutting a passage groove for passing a projection projecting from an outer peripheral portion of the trunk member. In the shield excavator provided on the outer peripheral portion, the cutting device includes a number of cutting bits disposed in the excavation direction ahead of the protrusion and disposed in a plurality of stages in the axial direction of the shield excavator, The plurality of cutting bits are arranged in at least two rows on both sides of the center line so that the rearmost bit is closer to the center line of the projection as a whole, and the plurality of cutting bits are viewed from the front in the excavation direction. The front cutting bit has a gentle mountain shape that is higher toward the center line side in front view, and at least at the rear of each row, a preceding cutting bit and a succeeding cutting that is adjacent to the preceding cutting bit and taller than the preceding cutting bit. In the bit, substantially only set the two-stage cutting section of the plurality of sets of cutting the same site in two stages with respect to said center line, said each cutting bit, easily escape cutting the cuttings laterally
A horizontal rake angle and a clearance angle for cutting. 2. The cutting machine according to claim 1, wherein each of the cutting bits further has a vertical rake angle . 3. The cutting device for a shield machine according to claim 1, wherein the cutting edge forming portion of each of the cutting bits is formed of a carbide tip. 4. The piping system of a simultaneous backfilling device for injecting a consolidating agent between the inner surface of the ground of the tunnel and the segment, and the cover is provided with the protrusion.
The cutting device for a shield machine according to any one of the above. 5. The system according to claim 1, wherein the protrusion is a piping system of a tail seal grease injection device for injecting a tail seal grease into a tail seal portion of the body member and a cover thereof. The cutting device for a shield machine described in the above.