JPH1181877A - Outbreak device for shield boring machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of difficulty in outbreak in a novel material shield- cuttable tunnel-wall of an arrival vertical shaft because of damage or defective in a cutting bit of an outbreak device for the novel material shield-cuttable tunnel-wall caused by a hard obstacle buried in natural ground in boring the natural ground after a shield boring machine passes a starting vertical shaft. SOLUTION: A device is provided with a rotary cutter device to drive rotation of a cutter blade 3a by a rotation drive device in the condition where the cutter blade 3a is protruded from an outer circumferential surface of a shield frame 2 before protruded parts 5, 8. It is also provided with a first cutting bit line comprising plural cutting bits 4 disposed in parallel in an axial direction to be protruded from the outer circumferential surface of the shield frame 2, and a second cutting bit line comprising plural cutting bits 4 disposed in parallel in an axial direction to be protruded from the outer circumferential surface of the shield frame 2. The first cutting bit line and the second cutting bit line are disposed in the middle of the rotary cutter device 3 and the protruded parts 5, 8, and they are disposed in such a way that intervals between both get gradually larger as they go backward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavating device for a shield machine used for tunnel construction, and more particularly, to a projection provided on an outer peripheral surface of a cylindrical shield frame of the shield machine. For excavating a passage groove through which a part passes.

[0002]

2. Description of the Related Art A shield excavator used for tunnel construction work generally has a rotating cutter disk at the tip thereof, and a plurality of cutter bits are arranged on the front surface of the cutter disk. Further, the side surface of the shield machine is constituted by a cylindrical shield frame, but a projection may be provided to project from the outer peripheral surface of the shield frame.

On the other hand, in recent years, a portion of a sealing opening of a starting pile and a reaching pile, which is a passage opening through which a shield machine passes,
2. Description of the Related Art A nomust construction method has been put to practical use, which is configured by a nomst wall that can be cut by a cutter disk, and the nomst wall portion is cut by a cutter disk to form a passage opening to start and reach a shield machine. Nomust wall is made of CFRP (Carbon Fiber Rei) made by impregnating and curing carbon fiber with resin.
This is a new material concrete in which CFRP strands formed by twisting strands of non-forced plastic) are solidified with mortar, and has a uniaxial compressive strength of, for example, 850 kg.
/ cm ² , a very hard material. Therefore, in order to provide a passage groove for allowing the projection protruding from the shield frame to pass through the nomust wall, an extra digging device that can withstand cutting of the nomst wall is required. As a structure of the over-digging device, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 9-100696. FIG. 10 shows an over-digging device described in this publication. In FIG. 10, reference numeral 107 denotes a cutter disk, 107a denotes a cutter bit, 102 denotes a shield frame, and 108 denotes a simultaneous backing injection pipe. The simultaneous back injection tube 108 is provided so as to protrude from the outer peripheral surface of the shield frame 102. This simultaneous back injection tube 10
Reference numeral 8 denotes an injection pipe attached to the back of the shield excavator 101 so that a backfill material can be immediately injected when a segment is assembled on an inner peripheral portion of a tail plate (not shown). Are provided at predetermined intervals in the circumferential direction on the outer periphery of the shield frame 102.
Reference numeral 104 denotes a cutting bit which constitutes an over-drilling device for cutting a passage groove through which the simultaneous back filling pipe 108 passes. As described above, this excavation device is constituted by a large number of cutting bits 104 fixed in a plurality of stages arranged in the axial direction of the shield machine 101. The height of these cutting bits 104 is gradually increased from the front stage to the rear stage, so that a passage groove through which the simultaneous back-filling injection tube 108 as a projection can pass is formed stepwise.

[0004]

In the shield machine 101 provided with an extra excavation device having the structure shown in FIG. 10, the cutting bit 10 is used even when digging into the ground after passing through the starting shaft.
4 keeps cutting the ground. There are hard obstacles on the way,
For example, an H-shaped steel or the like may be buried. Therefore, the cutting bit 104 may be damaged or lost while excavating the ground. If the cutting bit 104 is damaged or missing when the shield machine reaches the reaching shaft, it is difficult to dug a passage groove that allows the protrusion to pass through the nomost wall of the reaching shaft. Becomes

[0005] The invention of the present application is suitable for excavation of a hard material such as a nomst wall, and is less likely to be damaged or chipped during excavation in a ground between a start shaft and a reaching shaft. When the aircraft reaches the reaching shaft,
It is an object of the present invention to provide a surveillance device for a shield machine capable of forming a passage groove for allowing a projection to pass through a nomost wall of a reaching shaft without any problem.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a shield excavating device for a shield excavator according to the present application is provided with a cutter blade protruding from an outer peripheral surface of a shield frame in front of a projection. A rotary cutter device is provided which can rotate the cutter blade by a rotary drive device. Further, a first cutting bit row composed of a plurality of cutting bits protruding from the shield frame outer peripheral surface and arranged in the front-rear direction, and a first cutting bit array composed of a plurality of cutting bits protruding from the shield frame outer peripheral surface and arranged in the front-rear direction. And a second cutting bit string. And the first cutting bit row and the second cutting bit row are arranged in the middle of the rotary cutter device and the projection, and are arranged so that the interval between them increases from the front to the rear. ing.

[0007] Since the rotary cutter device performs primary overdigging before the cutting bit, even if there is a hard obstacle such as an H-shaped steel when cutting the ground in the middle after passing through the starting shaft, the cutting bit may be used. Is not easily damaged or lost.

[0008] In the above-mentioned excavator of the shield excavator, a copy cutter device for excavating a passage groove for allowing the protrusion to pass therethrough is provided in front of the rotary cutter device, and the copy cutter device excavates. If the cross section of the passage groove includes the cross section of the protrusion, the passage groove can be cut by the copy cutter device when digging the ground in the middle, so the rotary cutter device and cutting It is more effective to prevent the bit from being damaged or lost.

In the above-mentioned excavating device of the shield excavator, the rotary cutter device is provided with a protruding position at which at least a part of the cutter blade protrudes from the outer peripheral surface of the shield frame, and a retreating position where the cutter blade does not protrude from the outer peripheral surface of the shield frame. If switching means for switching to the position is provided,
The rotary cutter device can be set to the retreat position when excavating the ground in the middle, which is more effective in preventing the rotary cutter device from being damaged or lost in the middle of the ground.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shield excavating machine according to the present invention is provided with a through-groove for allowing a projection provided from an outer peripheral surface of a cylindrical shield frame of the shield machine to pass therethrough. In order to perform this, the cutter blade is rotatably driven by a rotary driving device in a state where the cutter blade protrudes from the outer peripheral surface of the shield frame in front of the protrusion. Rotating cutter device, a first row of cutting bits composed of a plurality of cutting bits protruding from the outer peripheral surface of the shield frame and arranged in the front-rear direction, and a plurality of cuttings protruding from the outer peripheral surface of the shield frame and arranged in the front-rear direction A second cutting bit string comprising bits, and wherein the first cutting bit string and the second cutting bit string are Wherein disposed in the intermediate protrusions, the first cutting bit sequence and said second cutting bit sequence and,
They are arranged such that the distance between them increases from the front to the rear. With this configuration,
A rotary cutter device performs primary overburden prior to the cutting bit. Therefore, after passing through the starting shaft, even if there is a hard obstacle such as H-section steel when cutting the ground in the middle, the cutting bit is not easily damaged or chipped, and when the shield machine reaches the reaching shaft In addition, a passage groove for allowing the projection to pass through the nomost wall of the reaching shaft can be formed without any problem.

[0011] In the above-mentioned excavating device for a shield machine, an interval between the first cutting bit row and the second cutting bit row is determined by setting a distance between the first cutting bit row and the second cutting bit row. And the widths of the protrusions at the rear ends of the first cutting bit train and the second cutting bit train may be substantially matched. With this configuration, it is possible to smoothly cut a passage groove large enough to allow the protrusion to pass.

[0012] In the above-mentioned excavating device for a shield machine, the plurality of cutting bits constituting the first cutting bit row are arranged so that the projecting dimension from the outer peripheral surface of the shield frame decreases from the front to the rear. The plurality of cutting bits constituting the second cutting bit row may be arranged so that the projecting dimension from the outer peripheral surface of the shield frame decreases from the front to the rear. With such a configuration, a cross section in which the projection height becomes smaller toward the side, for example, to cut a passage groove for passing a projection having a substantially arc-shaped cross section,
Particularly convenient.

[0013] In the above-mentioned excavating device for a shield machine, the cross-sectional shape of a passage groove excavated by the rotary cutter device, the first cutting bit line, and the second cutting bit line may be the same as that of the protrusion. When the projection is configured to substantially include the cross-sectional shape, it is effective to prevent the protrusion from being damaged by the ground.

In the above-mentioned excavating device for a shield excavator, a copy cutter device for excavating a passage groove for allowing the projection to pass therethrough is provided in front of the rotary cutter device. The cross-sectional shape of the passage groove to be excavated may be configured to substantially include the cross-sectional shape of the protrusion. With this configuration, when excavating the ground on the way, if the passage groove is cut by the copy cutter device, it is possible to prevent the rotary cutter device and the cutting bit from being damaged or chipped on the ground on the way. effective.

In the above-mentioned excavating device for a shield excavator, the rotary cutter device may further comprise a projecting position at which at least a part of the cutter blade projects from the outer peripheral surface of the shield frame; It may be configured to have a switching means for switching to a retreat position which does not protrude from the position. With this configuration,
If the rotary cutter device is set at the retreat position when excavating the ground in the middle, it is effective to prevent the rotary cutter device from being damaged or broken at the ground in the middle.

[0016]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a partial sectional view of a shield machine 1 employing a shield machine of the present invention. In FIG. 1, 2 is a shield frame, 3 is a rotary cutter device, 4 is a cutting bit, 5 is an entrance plate, 6 is a copy cutter device, 7 is a cutter disk, 7a is a cutter bit, and 8 is a pipe of a simultaneous back-filling injection device. It is. The shield frame 2 has a cylindrical shape, and a pipe 8 of the simultaneous back-filling injection device serving as a projection,
The entrance plate 5, which is a projection covering the periphery,
It is provided so as to protrude from the outer peripheral surface of the shield frame 2. The entrance plate 5 is provided so that the water stop packing provided on the nomust wall of the starting shaft can be closely attached to the outer periphery of the shield machine 1. The rotary cutter device 3 is provided forward of the entrance plate 5, and a copy cutter device 6 is further provided forward. In FIG. 1, the state of the rotary cutter device 3 is as follows.
At the protruding position protruding from the outer peripheral surface of the. The state of the rotary cutter device 3 can be switched to a retracted position where the cutter blade 3a does not protrude from the outer peripheral surface of the shield frame 2 by a switching device described later. The copy cutter device 7 is a device that can change the state of protrusion from the outer periphery of the cutter disk 7 according to the rotation phase of the cutter disk 7. The cutting bits 4 project from the outer peripheral surface of the shield frame 2 and are juxtaposed in the front-rear direction to form a cutting bit row. The plurality of cutting bits 4 are arranged such that the projecting dimension from the outer peripheral surface of the shield frame 2 decreases from the front to the rear.
Although not apparent from FIG. 1, two such cutting bit arrays are provided between the rotary cutter device 3 and the entrance plate 5.

FIG. 2 is a diagram showing a portion from the rotary cutter device 3 to the entrance plate 5 as viewed from above. Between the rotary cutter device 3 and the entrance plate 5, a first cutting bit array 4 </ b> A including 11 cutting bits 4 and a second cutting bit array 4 </ b> B also including 11 cutting bits 4 are provided. I have. The distance between the first cutting bit string 4A and the second cutting bit string 4B increases from the front to the rear. In addition, the interval substantially coincides with the width dimension of the cutter blade 3a at the tips of the two cutting bit arrays 4A, 4B.
At the rear end of B, it substantially matches the width dimension of the entrance plate 5.

FIG. 3 is a cross-sectional view of the rotary cutter device 3 for explaining the rotary cutter device 3 in more detail. 3a is a cutter blade, 3b is a motor as a rotary driving device for rotating the cutter blade 3a, and 3c is a motor 3
3d is a shaft connecting the rotary shaft of b and the cutter blade 3a.
Is a frame for incorporating these. The rotary cutter device 3 includes these members (the members indicated by oblique lines in the drawing).
It is composed of By moving the frame 3d up and down by the hydraulic cylinder 3e, the cutter blade 3
From the outer surface of the shield frame, or
Whether or not the cutter blade 3 projects from the outer peripheral surface of the shield frame can be switched. That is, the hydraulic cylinder 3e functions as a switching device for switching between a protruding position where the cutter blade 3 protrudes from the outer peripheral surface of the shield frame and a retreat position where the cutter blade 3 does not protrude from the outer peripheral surface of the shield frame.

FIG. 4 is a front view of the vicinity of the place where the cutting bit 4 is provided on the outer peripheral surface of the shield frame. Cutting bit 4 belonging to second cutting bit string 4B
Only the cutting bit 4 belonging to the first cutting bit string 4A is omitted. An entrance plate 5 having a substantially arc-shaped cross section appears behind the cutting bit 4. Further, the cross-sectional shape of the cutter blade 3b at the projecting position is indicated by a two-dot chain line. As can be seen from this figure, the rotary cutter device 3 and both cutting bit arrays 4A,
When the excavation by 4B is performed, the cross-sectional shape of the excavated groove substantially includes the cross-sectional shape of the entrance plate 5, so that there is an extra passage groove through which the entrance plate 5 can pass without obstacle. Be dug. More specifically, after the primary cutter is dug into the nomust wall by the rotary cutter device 3, the cutting bit train 4A,
4B penetrates into the side surface of the primary dug groove, gradually widens the groove by gradually cutting off the side surface, and finally a passage groove that allows the entrance plate 5 to pass through is formed in the nomust wall.

In the case of a shield machine in which the entrance plate 5 is not provided and the pipe 8 of the simultaneous backfilling apparatus is exposed, a passage groove through which the pipe 8 of the simultaneous backfilling apparatus can pass is formed. Excessive digging is sufficient, so that only the rotary cutter device 3 may be provided without providing the cutting bit 4. However, the rotary cutter device 3
It is difficult to form a passage groove through which the entrance plate 5 can pass only by using only the cutting plate. However, by providing the cutting bit arrays 4A and 4B, a passage groove sufficient to allow the entrance plate 5 to pass can be formed. Become.

FIG. 5 is a front view of the vicinity of the place where the cutting bit 4 is provided on the outer peripheral surface of the shield frame. Also in this figure, only the cutting bits 4 belonging to the second cutting bit string 4B are shown, and the cutting bits 4 belonging to the first cutting bit string 4A are omitted. An entrance plate 5 appears behind the cutting bit 4 as in FIG. What is indicated by the two-dot chain line is the trajectory of the cutter tip when the copy cutter device 6 is operated. As can be seen from this figure, the copy cutter device 6
Excavates a passage groove having a cross-sectional shape that includes the cross-sectional shape of the entrance plate 5 with a slight overcut. That is, a passage groove through which the entrance plate 5 can pass without obstacle is dug by the copy cutter device 5 in the ground.

Next, referring to FIGS.
From the starting shaft 10 using the nomst wall 10a to the ground 1
1 shows how to excavate.

FIG. 6 shows that the shield machine 1 has the nomst wall 1.
The state before excavating 0a is shown. The shield machine 1 is mounted on a base 10 d provided in the starting shaft 10. Then, the cutter disk 7 has already been intruded into the packing 10c for stopping water. The packing 10c is supported by the nomust wall 10a by a support member 10b. The packing 10c is for preventing the water pressure acting on the inside of the packing 10c from being released to the outside. In the state of FIG. 6, the copy cutter device 6 does not operate, and the rotary cutter device 3 is at the retracted position.

FIG. 7 shows that the shield machine 1 advances from the state shown in FIG.
0a shows a state where the passage opening is being excavated. While the cutter disk 7 excavates the nomust wall 10a,
The copy cutter device 6 is in a non-operation state. Further, the rotary cutter device 3 is kept at the retreat position while passing through the packing 10c.

FIG. 8 shows that the shield machine 1 advances from the state shown in FIG. 7, and the copy cutter device 6 makes an excavation in the ground 11, and the rotary cutter device 3 and the cutting bit train 4
A and 4B show a state in which extra digging is performed on the nomust wall 10a. When the copy cutter device 6 reaches the ground 11 after passing through the nomst wall 10a, the copy cutter device 6 excavates the ground 11 and forms a passage groove through which the entrance plate 5 can pass. After passing through the packing 10c, the rotary cutter device 3 switches from the retracted position to the protruded position before reaching the nomust wall 10a, and starts rotating the cutter blade 3a. The rotary cutter device 3 and the cutting bit arrays 4A and 4B form the
A passage groove through which the entrance plate 5 can pass is formed at 0a.

FIG. 9 shows a state in which the shield machine 1 advances from the state shown in FIG. In the state of FIG.
The rotary cutter device 3 has already passed through the nomust wall 10a, and has been switched from the projecting position to the retracted position.

The shield machine 1 continues to excavate the ground 11 from the state shown in FIG. When excavating the ground 11 between the starting shaft and the reaching shaft, the copy cutter device 6
Since the rotary cutter device 3 is set in the retreat position at the retraction position, even if a hard obstacle is buried in the ground 11, the rotary cutter device 3 and the cutting bit 4 are not damaged or chipped. Is done.

When the cutter disk 7 reaches the reaching shaft, the copy cutter device 6 is deactivated, and the rotary cutter device 3 is switched to the projecting position. Then, the rotary cutter device 3 and the cutting bit trains 4A and 4B perform extra excavation on the nomust wall of the reaching shaft.

In the description of the above-mentioned excavation state with reference to FIGS. 6 to 9, when the excavation of the ground 11 is performed, the copy cutter device 6 is used to perform extra excavation. With the apparatus 3 in the extended position, the cutter blade 3 is operated while the copy cutter apparatus 6 is operated.
Rotation of a may be carried out to carry out overdigging. Alternatively, the copy cutter device 6 may be deactivated, and the cutter blade 3a may be rotationally driven while the rotary cutter device 3 is kept at the protruding position to perform the excavation. Even in this case, the load acting on the cutting bit 4 is small since the preceding rotary cutter device 3 performs primary over-digging, so that the cutting bit 4 is not damaged or damaged.
It has the effect of preventing loss.

[0031]

The present invention is embodied in the form described above and has the following effects.

(1) According to the surveillance device of the shield machine according to the present invention, it is possible to prevent the cutting bit from being damaged or lost at the ground halfway from the starting shaft to the reaching shaft. Thus, a passage groove for allowing the projection to pass through the nomost wall of the reaching shaft can be formed without any problem.

(2) Further, when excavating the ground in the middle, the passage groove is cut by the copy cutter device, so that the rotary cutter device and the cutting bit are prevented from being damaged or chipped in the ground in the middle. Can be.

(3) If the rotary cutter device is set at the retreat position when excavating the ground on the way,
It is possible to prevent the rotary cutter device from being damaged or lost in the middle of the ground.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view mainly showing a distal end side of a shield machine that employs the present invention.

FIG. 2 is a view of a portion from a rotary cutter device to an entrance plate as viewed from above.

FIG. 3 is a sectional view of a rotary cutter device.

FIG. 4 is a front view of the vicinity of a location where a cutting bit is provided on the outer peripheral surface of the shield frame.

FIG. 5 is a front view of the vicinity of a location where a cutting bit is provided on the outer peripheral surface of the shield frame.

FIG. 6 is a diagram showing a state before the shield machine excavates a nomst wall.

FIG. 7 is a view showing a state in which the shield machine advances from the state of FIG. 6 and a passage opening is excavated in a nomst wall by a cutter disk.

FIG. 8 is a diagram showing a state in which the shield machine advances from the state of FIG. 7, and the dugout is dug into the ground by the copy cutter device, and is dug into the nomust wall by the rotary cutter device and the cutting bit array. is there.

FIG. 9 is a view showing a state where the shield machine advances from the state of FIG. 8 and a dugout is dug into the ground by the copy cutter device.

FIG. 10 is a view showing a conventional over-digging device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Shield excavator 2 ... Shield frame 3 ... Rotary cutter device 3a ... Cutter blade 3b ... Motor 3c ... Shaft 3d ... Frame 3e ... Hydraulic cylinder 4 ... Cutting bit 4A ... First cutting bit string 4B ... Second cutting bit string 5 ... Entrance plate 6 ... Copy cutter device 7 ... Cutter disk 7a ... Cutter bit 8 ... Piping of simultaneous back-filling injection device 10 ... Starting shaft 10a ... Nomst wall 10b ... Support member 10c ... Packing 10d ... Base 11 ... Ground mountain

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Nobuhiro Honda 1-3-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Inventor Saburo Morio Higashi-Kawasaki, Chuo-ku, Kobe-shi, Hyogo 1-3 1-3, Komachi Kawasaki Heavy Industries, Ltd. Kobe Head Office

Claims (6)

[Claims] 1. An excavating device for a shield machine for excavating a passage groove for allowing a projection provided to protrude from an outer peripheral surface of a cylindrical shield frame of the shield machine to pass therethrough. A rotary cutter device capable of rotating the cutter blade by a rotary driving device in a state where the cutter blade protrudes from the outer peripheral surface of the shield frame in front of the protrusion, and a front-rear direction protruding from the outer peripheral surface of the shield frame. A first cutting bit string consisting of a plurality of cutting bits arranged side by side, a second cutting bit string consisting of a plurality of cutting bits juxtaposed in the front-rear direction and protruding from the outer peripheral surface of the shield frame,
The first cutting bit row and the second cutting bit row are disposed in the middle of the rotary cutter device and the protrusion, and the first cutting bit row and the second cutting bit row are An excavation device for a shield machine, which is arranged so that the distance between the two increases from the front to the rear. 2. The interval between the first cutting bit row and the second cutting bit row substantially coincides with the width dimension of the cutter blade at the tip of the first cutting bit row and the second cutting bit row. 2. The excavating device for a shield machine according to claim 1, wherein a rear end of the first cutting bit row and a rear end of the second cutting bit row substantially coincide with a width dimension of the projection. 3. A plurality of cutting bits constituting the first cutting bit row are arranged such that a protrusion dimension from the outer peripheral surface of the shield frame decreases from the front to the rear, forming the second cutting bit row. The plurality of cutting bits to be formed are arranged such that the projecting dimension from the outer peripheral surface of the shield frame decreases from the front to the rear.
Or an overdigging device for a shield machine described in 2 above. 4. A cross-sectional shape of a passage groove excavated by the rotary cutter device, the first cutting bit row, and the second cutting bit row, roughly includes a cross-sectional shape of the projection. The surplus digging device for a shield machine according to any one of claims 1 to 3. 5. A copy cutter device for digging a passage groove for allowing the protrusion to pass therethrough is provided in front of the rotary cutter device, and a cross-sectional shape of the passage groove excavated by the copy cutter device is provided. 5. The excavation device for a shield machine according to claim 1, wherein the cross-sectional shape of the protrusion is roughly included. 6. A switch for switching the rotary cutter device between a protruding position where at least a part of the cutter blade protrudes from the outer peripheral surface of the shield frame and a retracted position where the cutter blade does not protrude from the outer peripheral surface of the shield frame. 6. An excavation device for a shield machine according to any one of claims 1 to 5, further comprising means.