TWI618850B - Cutter board of shield tunneling machine, shield tunneling machine including the cutter board and method for adjusting height of protection bit for protecting outer peripheral ring portion of the cutter board - Google Patents

Abstract

An object of the present invention is to provide a technique for improving the life of a protective bit of a peripheral ring portion of a tool disk for protecting a shield excavator, which is configured to be configured to detect the outer ring portion 2d outside the cutting head 2 The detecting portion of the wear state of the outer peripheral surface adjusts the protruding height of the protective bit 4d for protecting the outer peripheral ring portion 2d based on the information detected by the detecting portion. In the outer peripheral ring portion 2d, the hydraulic pressure pipe 21p is provided as a detecting portion, and the wear of the outer peripheral ring portion 2d is detected in accordance with the state in which the hydraulic pressure in the hydraulic pipe 21p is lowered, and the outer peripheral ring portion 2d is detected. At the time of wear, it is judged that the protruding portion of the protective drill 4d is also worn, so that the tip end portion of the protective drill 4d is protruded to the standard position by the jack 20.

Description

Tool disk of a shield shield excavator, a shield shield excavator equipped with the cutter disc, and a height adjustment method for protecting a drill bit of a peripheral ring portion of the cutter disc

The invention relates to a method for adjusting the height of a protection drill bit of a cutter disk of a shield shield excavator, a shield shield excavator having the cutter disk and a cutter disk of the protection shield excavator, for example, about protecting the outer circumference of the cutter disk The technique of the wear protection of the protection bit of the ring part.

The submerged shield excavator is a machine that advances the excavation pit on the foundation by pressing the cutter disc provided on the front side of the foundation against the excavation surface of the foundation and rotating it. In the outer peripheral portion of the cutter disk of the shield excavator, a protective drill for protecting the outer peripheral ring portion is provided (for example, refer to Patent Document 1).

(previous technical literature)

(Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 2012-207412

However, the protective bit for protecting the outer peripheral ring portion of the cutter disk is fixed to the outer peripheral ring portion by welding or the like. Therefore, when the drill bit is worn to be worn, the protective drill bit must be partially opened from the outer peripheral ring by gas cutting or the like, and the new protection is re-welded. drill. In addition, it is necessary to protect the drill bit from abrasion by exposing the drill to the excavation surface. Therefore, the wear confirmation and replacement work of the protection drill bit can interrupt the excavation work for a long period of time, which is a major cause of hindering the long-distance construction of the shield excavator.

Especially when using the shield shield excavator to excavate the gravel layer and the cobble layer, the environment of the outer circumference of the cutter disc is not good, and the frequency of replacement of the drill does not depend on the wear of the main drill bit in front of the cutter disc, and most of them depend on the outer circumference. The ring protects the wear of the drill bit. Therefore, in the excavation work under the condition that the tool plate environment is not good, how to reduce the wear confirmation and replacement frequency of the protection bit of the outer ring portion of the tool disk to achieve long-distance construction of the shield excavator is an important issue. .

The present invention has been made in view of the above technical background, and an object thereof is to provide a technique for improving the life of a protective drill bit of a peripheral ring portion of a cutter disk for protecting a shield excavator.

In order to solve the problem, the tool disk of the shield excavator of the present invention described in the first aspect of the invention is provided with a protective drill bit that is moved forward in the radial direction of the cutter disk of the shield excavator. The outer peripheral ring portion is protruded from the outer peripheral ring portion to protect the outer peripheral ring portion, and the detecting means detects the wear state of the outer peripheral ring portion based on the wear of the detecting portion provided in the outer peripheral ring portion; and the height adjusting means Based on the information detected by the detecting means, the protruding height of the protective bit protruding from the outer peripheral ring portion is adjusted.

The invention of claim 2, wherein the height adjustment means is configured to set the height of the protection bit according to the information detected by the detection unit. Adjust to multiple segments.

The invention of claim 3, wherein the detecting means is based on the condition that the fluid pressure is lowered by the wear of the detecting portion, and the detecting means is detected. An accumulator type wear detecting device that is in an worn state of the outer peripheral ring portion.

The invention of claim 4 is the invention of claim 1 or 2, wherein the detecting means is changed by the wear of the detecting portion depending on the conduction state. A general-purpose wear detecting device that detects the wear state of the outer peripheral ring portion.

Further, the shield shovel of the present invention of the fifth aspect of the invention is provided with the cutter disk according to any one of the first to fourth aspects of the invention in the front of the machine body in a state of being freely rotatable.

In addition, the method for adjusting the height of the protection drill bit of the peripheral ring portion of the cutter disk of the protective shield excavator of the invention of claim 6 includes: by the outer circumference of the cutter disk of the shield excavator a step of detecting an abrasion state of the outer circumferential ring portion by the detecting portion; and adjusting a protruding height of the protective drill protruding from the outer circumferential surface of the outer circumferential ring portion to protect the outer circumferential ring portion based on information detected by the detecting portion step.

According to a seventh aspect of the invention, in the invention of the sixth aspect of the invention, the protruding height of the protective bit is adjusted to a plurality of stages in accordance with information detected by the detecting unit.

According to the invention of the first aspect of the invention, since the protruding height of the protective bit of the peripheral ring portion of the cutter disk of the shield excavator can be adjusted according to the wear state of the outer peripheral ring portion, the protection bit can be improved. life.

According to the invention of claim 2, the protruding height of the protective bit of the outer peripheral ring portion of the cutter disk for protecting the shield excavator can be adjusted to a plurality of stages, so that the life of the protective bit can be improved.

According to the invention of claim 3, the error detection due to the influence of external factors can be reduced or prevented, so that the reliability of the detection information of the wear state of the outer ring portion of the cutter disk can be improved.

According to the invention described in claim 4, the structure of the detecting portion of the detecting means can be simplified.

According to the invention of claim 5, the life of the protection bit of the outer peripheral ring portion of the protection tool disk can be improved, and the replacement frequency of the protection bit can be reduced, so that the long-distance construction of the shield shovel can be realized.

According to the invention of claim 6, the protruding height of the protective bit of the peripheral ring portion of the cutter disk of the shield excavator can be adjusted according to the wear state of the outer ring portion, so that the life of the protection bit can be made improve.

According to the invention of claim 7, the protruding height of the protective bit of the outer peripheral ring portion of the cutter disk for protecting the shield excavator can be adjusted to a plurality of stages, so that the life of the protective bit can be increased.

1‧‧‧Soil pressure shield excavator

2‧‧‧Cutting head (tool disk)

2a‧‧·wheel hub

2b‧‧‧ spokes

2c‧‧‧Intermediate ring

2d‧‧‧Outer Rings

2e‧‧‧through holes

2f‧‧‧Restricted protrusion

3‧‧‧ machine body

3a‧‧‧ front panel

3b‧‧‧ rear panel

4a‧‧‧Center drill bit

4b, 4c‧‧‧ drill bit

4d‧‧‧Protection drill

4da‧‧‧ support plate

4db‧‧‧ bit body

4e‧‧‧Copy drill bit

5a1 to 5a4, 5b‧‧‧Addition material injection

6‧‧‧ mud tank

7‧‧‧Baffle

8‧‧‧Cutting drive body

9a‧‧‧ articulated jack

9b‧‧‧Shield Jack

10‧‧‧Spiral conveyor

10a‧‧‧ sand into the end

10b‧‧‧Draining end

10c‧‧‧ leaves

15a, 15b, 16a, 16b‧‧‧ stirring wings

20‧‧‧ jack

20p‧‧‧Piston

21‧‧‧Abrasion detection device

21P, 21Pa, 21Pb‧‧‧ hydraulic piping (detection department)

21C‧‧‧Detection Department

21Ca‧‧‧Sensor Department

21Cb‧‧‧ Ring Department

21L‧‧‧ wiring

22‧‧‧through holes

23‧‧‧Installation station (height adjustment means)

24‧‧‧Base (height adjustment means)

25a, 25b‧‧‧ Spacer (height adjustment means)

26‧‧‧Bolts (height adjustment means)

D1, D2‧‧‧Abrasion detection position

Ls‧‧‧ standard line

RA, RB‧‧‧ cutting head area

SG‧‧‧The rear section of the machine body

Fig. 1 is a view showing a configuration in which the inside of a earth pressure shield shovel according to an embodiment of the present invention is displayed from the side.

Fig. 2(a) is a front view of the cutting head of the earth pressure shield excavator of Fig. 1, and Fig. 2(b) is the position of the earth pressure shield excavator of Fig. 1 viewed from the direction of the arrow. The composition of A.

Fig. 3 is a plan view showing a main part of the back side of the cutting head of the earth pressure shield excavator of Fig. 1.

Fig. 4(a) is an enlarged cross-sectional view showing a main portion of a region RA of the cutting head of Fig. 3, and Fig. 4(b) is an enlarged cross-sectional view showing a main portion of a tip end portion of the protective drill of Fig. 5(a).

Fig. 5(a) is a plan view showing a main portion of an outer peripheral ring portion of a cutting head at a position A of Fig. 4(a) viewed from a direction of an arrow symbol, and Fig. 5(b) is a view of Fig. 5(a). A cross-sectional view of the main part of the line.

Fig. 6 (a) and (b) are enlarged cross-sectional views showing main parts of a region RB of the cutting head of Fig. 3.

Fig. 7 (a) and (b) are cross-sectional views showing main parts of the cutting head in the process of adjusting the protruding height of the drill.

Fig. 8 (a) and (b) are cross-sectional views showing main parts of the outer peripheral ring portion of the cutting head according to the second embodiment.

(a) and (b) are cross-sectional views of essential parts of the outer peripheral ring portion of the cutting head in the projection height adjustment operation of the protective drill according to the second embodiment.

Fig. 10 (a) and (b) are cross-sectional views showing the main part of the outer peripheral ring portion of the cutting head in the projection height adjustment operation of the protective drill after the ninth drawing.

Fig. 11 is a cross-sectional view showing a main part of an outer peripheral ring portion of a cutting head according to a third embodiment.

(a) and (b) are cross-sectional views of essential parts of the outer peripheral ring portion of the cutting head in the projection height adjustment operation of the protective drill according to the third embodiment.

Fig. 13 (a) and (b) are cross-sectional views showing main parts of the outer peripheral ring portion of the cutting head in the projection height adjustment operation of the protective drill after the second drawing.

Fig. 14(a) is a cross-sectional view showing a main part of a peripheral ring portion of a cutting head according to a fourth embodiment, and Fig. 14(b) is an enlarged sectional view showing a main part of the wear detecting unit of Fig. 14(a). .

Fig. 15 (a) and (b) are cross-sectional views showing main parts of the outer peripheral ring portion of the cutting head in the projection height adjustment operation of the protective drill of the fourth embodiment.

Hereinafter, an embodiment of the present invention will be described in detail based on the drawings. In the drawings for explaining the embodiments, the same components are denoted by the same reference numerals, and the description thereof will be omitted.

(First embodiment)

Fig. 1 is a structural view showing the inside of the earth pressure shield excavator of the present embodiment as seen from the side, and Fig. 2(a) is a cutting head of the earth pressure shield excavator of Fig. 1 In the front view, Fig. 2(b) is a view showing the configuration of the position A of the earth pressure shield shovel of Fig. 1 in the direction indicated by the arrow.

The earth pressure submersible excavator 1 of the present embodiment is formed by injecting and mixing an additive material into the sand excavated by the cutting head (tool disc) 2 to produce water impermeability and plastic fluidity (freely deformable) And the soil of the nature of the movement, and excavating in a state where the soil is filled into the chamber between the cutting head 2 and the machine body 3 to generate the mud pressure, and the earth pressure between the soil and the excavation surface is made The machine for constructing excavation pits in a confrontational state is especially suitable for excavating a foundation containing gravel and cobble layers mixed with large gravel and mixed with large gravel. Of course, it can also be used in gravel layers with large gravel and mixed with large gravel layers and large gravel layers or ordinary gravel layers.

Further, the excavation outer diameter of the earth pressure shield shovel 1 is, for example, about 5900 mm. Further, the mechanical length of the earth pressure shield shovel 1 is, for example, about 7140 mm. Furthermore, the operation of the earth pressure shield shovel excavator It is controlled by an operator in an operation room in a subsequent trolley (not shown) disposed behind it.

The cutting head 2 is a member for excavating the excavation surface of the foundation, and is provided in front of the machine body 3 in a rotatable state along the circumferential direction of the cutting head 2. This cutting head 2 is, for example, of a disc-shaped spoke type. That is, as shown in Fig. 2(a), the cutting head 2 includes a central hub portion 2a, six spoke portions 2b extending radially from the hub portion 2a, and an intermediate ring portion 2c. The intermediate portions of the spoke portions 2b are connected to each other in the extending direction, the outer peripheral ring portions 2d are connected to the tip end portions of the spoke portions 2b, and the through holes 2e are formed between the members.

A center bit 4a is attached to the hub portion 2a at the center of the cutting head 2. In each of the spoke portions 2b, a plurality of drills 4b are arranged in a regular arrangement. Further, other digging members such as a conical-type roller drill or the like may be attached to the hub portion 2a. Further, in the spoke portion 2b, in addition to the drill 4b, other excavating members such as a roller drill or the like may be installed.

Further, additive material injection portions 5a1, 5a2, 5a3, and 5a4 are provided in the hub portion 2a and the spoke portion 2b. The additive material injection portions 5a1 to 5a4 are constituent portions in which a clay material such as a bentonite-based additive material is injected into the excavation surface of the front surface of the cutting head 2. Further, in terms of the additive material injected from each of the additive material injection portions 5a1 to 5a4, the foam material may be used instead of the bentonite-based additive material, or both the bentonite-based additive material and the bubble material may be used.

Between the adjacent spokes 2b, 2b in the intermediate ring portion 2c The center is provided with a restriction protrusion 2f. The sand excavated by the cutting head 2 is introduced into the mud tank 6 (see FIG. 1) to be described later through the through hole 2e, and the restriction protrusion 2f is restricted by restricting the opening area of the through hole 2e. The gravel and cobbles in the foundation enter the portion of the mud tank 6 through the through hole 2e. The surface of the restricting projection 2f is also provided with a drill 4b.

The outer peripheral ring portion 2d is formed to have a predetermined thickness in the radial direction of the cutting head 2, and is formed of a steel plate having a predetermined width in the digging direction, and is formed as a ring so as to surround the outer periphery of the cutting head 2. shape.

In the outer peripheral ring portion 2d, a plurality of drills 4c are arranged and arranged in a state in which the blade faces the outer peripheral side on the front surface side of the excavation surface side. Further, on the outer peripheral surface of the outer peripheral ring portion 2d, for example, two copy drills 4e are attached to the opposite extreme positions. This copy drill 4d has a function of super-excavation during the emergency curve construction and posture control of the earth pressure shield shovel 1. Further, on the outer peripheral surface of the outer peripheral ring portion 2d, for example, a protective drill for protecting the outer peripheral ring portion 2d is provided between the adjacent portions of the spoke portions 2b (not shown in Figs. 1 and 2). Further, the structure for protecting the drill bit will be described in detail later.

On the other hand, as shown in Fig. 1, the main body 3 includes a front sill 3a of the cutting portion and a rear sill 3b at the rear. The front sill plate 3a and the rear sill plate 3b are formed of, for example, a cylindrical steel plate, and form a hollow space member inside the machine body 3 while forming the outer shape of the machine body 3. The front sill 3a and the sill 3b are supported by the front sill 3a At the rear end side, the spherical bearing portion of the tip end of the rear sill 3b comes into contact with the inner peripheral surface of the front sill 3a, and is fitted.

In the front side of the front sill 3a, a partition 7 that partitions the hollow space in the machine body 3 into the excavation face side and the machine inner side is provided at a position receding from the front side thereof to the inner side of the machine body 3. The muddy water tank 6 is provided on the excavation surface side of the partition plate 7, that is, between the cutting head 2 and the partition plate 7, and the additive material injection portion 5b is provided inside the partition plate 7 a cutting drive body 8; an articulated jack 9a; a shield jack 9b; a screw conveyor 10; and a soil pressure detecting portion 11.

The additive material injection portion 5b is a device that injects the additive material into the mud chamber 6 outside the machine body 3, and is disposed on the partition plate 7 in a state where the injection port of the additive material injection portion 5b is exposed to the outside of the machine body 3. Near the periphery. For the additive material to be injected from the additive material injection portion 5b, for example, a bentonite-based additive material is used as the clay material. Further, in terms of the additive material to be injected from the additive material injection portion 5b, the foam material may be used instead of the bentonite-based additive material, or both the bentonite-based additive material and the bubble material may be used.

The mud tank 6 series will be introduced into the space by using the sand excavated by the cutting head 2. In the mud tank 6, a stirring blade 15a, 15b protruding in a cylindrical shape or the like in the mud tank 6 is provided in front of the partition 7, and on the other hand, a muddy tank 6 is provided on the back surface of the cutting head 2. Stirring wings 16a, 16b of a cylindrical shape or the like inside. The agitating blades 15a, 15b, 16a, 16b are provided with a stirring function, and the agitating function is such that the agitating blades are displaced from each other in the radial direction of the cutting head 2, and will enter when the cutting head 2 rotates. The sand in the mud tank 6 is mixed with the added material injected into the mud tank 6 while being mixed.

Further, the agitation blade 15b provided on the center side of the surface of the partition plate 7 has an additive injection portion for injecting an additive material into the mud tank 6 from the tip end side. For the additive material injected from the stirring blade 15b, for example, a bubble material is used. Further, in addition to the additive material injected from the stirring blade 15b, a bentonite-based additive material may be used instead of the bubble material, or both a bentonite-based additive material and a bubble material may be used.

The cutting drive body 8 is a drive source for rotating the cutting head 2. Here, as the cutting drive method, an intermediate support drive method is exemplified, and as shown in FIG. 1 , the cutting drive body 8 is disposed at a position substantially at the center of the center and the outer circumference of the front surface of the cutting head 2 along the cutting head. The circumferential direction of 2 is arranged in a plurality of ways.

The hinge jack 9a is a machine for correcting the driving direction of the earth pressure shield shovel 1 while the front sill 3a and the sill plate 3b are connected, as shown in Fig. 1, before the span in the machine body 3 The position of the boundary between the seesaw 3a and the rear sill 3b is arranged in a plurality of rows along the circumferential direction of the earth pressure shield shovel 1. The earth pressure squeezing excavator 1 is pushed by the pressure oil to the hinge jack 9a and the front sill 3a and the sill plate 3b are bent in a predetermined direction and angle to control the soil. The driving direction of the submersible shield excavator 1.

The shield jack 9b is a machine that generates a reaction force in a section SG disposed at the rear of the machine body 3 to generate a driving force for advancing the earth pressure shield excavator 1. As shown in Fig. 1, it is attached to the machine. Ontology 3 As shown in FIG. 2(b), the position intersecting the boundary between the front sill 3a and the sill 3b is arranged in a plurality of rows along the circumferential direction of the earth pressure shield shovel 1.

The screw conveyor 10 is a machine that discharges the sand introduced into the mud tank 6 to the machine outside the machine, as shown in Fig. 1, the sand disposed in the mud tank 6 from the bottom of the machine body 3 through the partition plate 7. The discharge end portion 10a is disposed in a state in which the discharge end portion 10b disposed at a position slightly higher than the center in the height direction of the machine body 3 toward the rear of the machine body 3 is continuously extended obliquely upward.

This screw conveyor 10 uses, for example, a belt type screw conveyor in which a spiral blade 10c having no rotating shaft is installed in a pipe. In the case of a screw conveyor having a rotating shaft, it is easy to block due to gravel or the like. In the case of the belt screw conveyor 10, the maximum diameter of the transportable gravel or the like can be set to be equal to or larger than the radius of the conveying path, and It cannot be transported by gravel or the like of a size such as a screw conveyor having a rotating shaft. In this way, the earth pressure shield shovel 1 of the present embodiment has a configuration in which large pebbles or the like which can be discharged by the screw conveyor 10 are not crushed and introduced into the mud tank 6.

Further, a drain pipe (not shown) is connected to the discharge end portion 10b of the screw conveyor 10, and the sand system that is transported to the discharge end portion 10b of the screw conveyor 10 is transported to the waste rock transport trolley through the dump pipe. (not shown), etc.

The earth pressure detecting portion 11 converts the pressure caused by the soil in the mud tank 6 into a sensor portion of the electric signal by a strain gauge, and The earth pressure detecting surface is disposed in the state of the mud tank 6. The earth pressure submersible shovel 1 is managed so that the mud pressure in the mud tank 6 detected by the earth pressure detecting unit 11 is within a predetermined value range, while maintaining the stability of the excavation surface. Mining processing.

Next, the structure of the above-described protective drill bit will be described with reference to Figs. 3 to 6 . Fig. 3 is a plan view showing a main part of the back side of the cutting head of the earth pressure shield excavator of Fig. 1. Fig. 4(a) is an enlarged cross-sectional view showing a main portion of a region RA of the cutting head of Fig. 3, and Fig. 4(b) is an enlarged sectional view showing a main portion of a tip end portion of the protective bit of Fig. 4(a), Fig. 5(a) is a plan view showing a main portion of a peripheral ring portion of a cutting head at a position A of Fig. 4(a) viewed from a direction of an arrow symbol, and Fig. 5(b) is a view of Fig. 5(a) A cross-sectional view of a main portion of the line, Fig. 6 (a), and (b) are enlarged cross-sectional views of a main portion of a region RB of the cutting head of Fig. 3. Further, the standard line Ls indicated by the double-dot chain line in Figs. 4 and 6 is the standard protruding height of the protective bit set at the time of excavation work.

As shown in FIG. 3, the cutting head 2 is provided with a protective bit 4d, a jack (height adjusting means) 20, and a hydraulic pipe (detecting portion) 21P of the abrasion detecting device 21.

As shown in Fig. 3, the protective drill 4d for protecting the outer peripheral ring portion 2d is disposed, for example, between the adjacent portions of the spoke portions 2b, and has a support plate 4da and a drill bit as shown in Figs. 4 and 5 Ontology 4db. The support plate 4da is a member that supports the drill body 4db, for example, formed of a rectangular flat metal. On the other hand, the drill body 4db is a foundation excavation body, for example, formed of a cemented carbide. The bit body 4db is bonded to The end surface of the support plate 4da on the excavation face side is partially embedded in a state of extending from the end face of the support plate 4da toward the inside.

In the outer peripheral portion 2d of the cutting head 2, a through hole 22 penetrating the outer peripheral surface and the inner peripheral surface of the outer peripheral ring portion 2d is provided at a position where the protective bit 4d is disposed. As shown in FIG. 5, the through hole 22 is formed in a planar slit shape in which the length of the outer circumferential ring portion 2d in the width direction is longer than the circumferential length of the outer circumferential ring portion 2d.

As shown in FIGS. 3 to 5, the protective drill 4d is inserted into the through hole 22 of the outer peripheral ring portion 2d, and is provided in a state of being movable in the radial direction of the cutting head 2. Here, the rear end of the drill bit 4d (end portion on the opposite side to the digging side) is provided with the jack 20 in a state where the tip end of the piston 20p is brought into contact with the rear end of the protection drill 4d.

The jack 20 is a device that controls the protruding height of the drill bit 4d by controlling the protruding height of the piston 20P based on the information detected by the abrasion detecting device 21 (that is, protecting the tip end portion of the drill bit 4d from the outer peripheral ring) The height at which the outer peripheral surface of the portion 2d protrudes is set at a predetermined height. Here, in the case of the jack 20, for example, a hydraulic jack is used.

Further, on the inner peripheral side of the outer peripheral ring portion 2d, a mounting base 23 formed to surround the protective drill 4d and the through hole 22 is provided between the inner peripheral surface thereof and the end surface of the piston 20p of the jack 20.

The wear detecting device 21 is a device that detects wear when the outer peripheral surface portion of the peripheral ring portion 2d is excessively wound by a predetermined amount (thickness). Here, the wear detecting device 21 is constituted by, for example, an accumulator type wear detecting device, and includes: a hydraulic pipe 21P; and a hydraulic circuit (not As shown in the figure, the oil is supplied to the hydraulic piping 21P.

The hydraulic pipe 21P is a detecting portion for detecting the wear state of the outer peripheral ring portion 2d of the cutting head 2, and as shown in Fig. 3, extends from the center in the digging surface of the cutting head 2 along the spoke portion 2b. On the other hand, the inside of the thick wall of the outer peripheral ring portion 2d at the outermost periphery of the spoke portion 2b is terminated. In other words, the tip end of the hydraulic pipe 21P does not reach the outer peripheral surface of the outer peripheral ring portion 2d as shown in Fig. 6(a), but is located at a midway position in the thickness direction of the outer peripheral ring portion 2d (by the outer peripheral ring portion 2d). The wear detection position of the thickness of the outer peripheral surface determined in advance is terminated.

The oil pressure circuit supplies oil to the hydraulic pressure pipe 21P to increase the oil pressure in the hydraulic pressure pipe 21P, and measures the oil pressure in the hydraulic pressure pipe 21P, and when the oil pressure in the hydraulic pressure pipe 21P is measured, the oil pressure is lowered. The information is transmitted to the circuit of the control unit in the above operation room, and is provided inside the machine body 3. Further, when the hydraulic pressure in the hydraulic pipe 21P is lowered, the control unit displays the content as an alarm on the operation monitor in the operation room.

Here, as shown in Fig. 6(a), when the outer peripheral surface of the peripheral ring portion 2d is not worn by the cutting head 2, the hydraulic pressure in the hydraulic pipe 21P is increased, but as shown in Fig. 6 (Fig. 6) (b), when the outer peripheral surface of the outer peripheral ring portion 2d is worn out and the tip end portion of the hydraulic pipe 21P is exposed, the oil leaks from the hydraulic pipe 21P to the outside and the oil pressure in the hydraulic pipe 21P is lowered. . The abrasion detecting device 21 detects the wear state of the outer ring portion 2d by detecting the decrease in the hydraulic pressure. When the wear state of the outer peripheral ring portion 2d is detected in accordance with the decrease in the oil pressure in this manner, the erroneous detection due to the influence of the external factors can be reduced or prevented, and the information of the outer peripheral ring portion 2d can be detected. Increased reliability.

When the oil pressure in the hydraulic pressure pipe 21P is lowered by the wear detecting device 21, it is determined that the outer circumferential surface of the outer circumferential ring portion 2d is worn to a predetermined amount (thickness), and it is determined that the outer circumference of the outer circumferential ring portion 2d is The protrusion of the protective drill bit 4d which protrudes from the surface also causes wear. Therefore, in the present embodiment, at the stage of detecting the abrasion of the outer peripheral ring portion 2d, by projecting the piston 20p of the jack 20 to a predetermined length, the protruding height of the tip end portion of the protective drill 4d is protruded to The position of the original standard line Ls.

In addition, although at least one hydraulic piping 21P is sufficient, the case where two hydraulic piping 21P are disperse|distributed is illustrated here. By disposing the plurality of hydraulic pipings 21P in a distributed manner, the wear state of the outer peripheral ring portion 2d of the cutting head 2 can be more accurately grasped. Further, even if any of the hydraulic pipings 21P is missing, the wear state of the outer circumferential ring portion 2d can be detected as long as the other hydraulic piping 21P is normal.

Next, the mud pressure shield method of the earth pressure shield shield excavator 1 of Fig. 1 will be described.

In the earth pressure shield shovel 1 of the present embodiment, the excavation pit is constructed in the foundation by pushing the machine head 3 while pressing the cutting head 2 against the excavation surface and rotating it. Here, for example, a foundation having a fine particle (sand portion) having a particle diameter of 2 mm of not more than 20% and a gravel (gravel portion) having a particle diameter of 2 mm or more of more than 80% is used as an excavation target.

When performing this excavation work, the above-mentioned additive material is added to the sand excavated by the cutting head 2, and by the rotation of the cutting head 2 Following the action of the rotating agitating blades 16a, 16b, etc., the sand and the additive material are stirred and mixed to convert the excavated sand into a soil having plastic fluidity and water impermeability. Then, the soil is filled in the mud tank 6 and the screw conveyor 10, and the soil full of the soil is pressurized by the driving force of the shield jack 9b, and the soil pressure is generated, and by pressing the soil The earth pressure of the excavation face is opposed to maintain the stability of the excavation face. Further, for example, by keeping the rotational speed of the cutting head 2 constant, and adjusting the extension speed of the shield jack 9b and the rotational speed of the screw conveyor 10, the soil pressure in the mud tank 6 is measured by the above-described earth pressure gauge 11a. And the soil pressure is made constant to maintain the stability of the excavation surface.

The bentonite-based additive (for clay) added as an additive material has the following effects in addition to the effect of improving the plastic fluidity and water impermeability of the sand: the gravel of the crushed gravel and the large The gravel portion of the pebbles and the like is enclosed together with the excavated sand and the body of the excavated sand and gravel portion is improved in such a manner that the gravel portion is not separated from the excavated sand.

On the other hand, the bubble material added as an additive material has the following effects in addition to suppressing the separation of the gravel portion from the cutting head 2 and the separator 7, and is also capable of being obtained by using the bentonite-based additive material. The buffering effect is to improve the compressibility of the excavated sand and the mud material, so as to inhibit the gravel part from rolling in the mud tank 6 and the screw conveyor 10. In addition, even if rolling, the buffering action is used to suppress the sharp change of the mud pressure. .

Therefore, it is not suitable to introduce boulders into the mud tank 6 When the stone is mixed with the gravel layer mixed with the cobble and the foundation where the cobble layer exists, the soil pressure can be stabilized, and the stability of the excavation surface can be maintained, so that the screw conveyor 10 can be used. The soil discharged into the gravel portion smoothly moves to prevent the occurrence of clogging and prevent the occurrence of squirting.

Next, the adjustment of the protruding height of the protective drill 4d will be described with reference to Fig. 7. Fig. 7 (a) and (b) are cross-sectional views showing main parts of the cutting head in the process of adjusting the protruding height of the drill. Further, in FIGS. 7(a) and 7(b), the left side indicates the wear detecting portion, and the right side indicates the protective bit arrangement portion.

In the excavation work performed by the earth pressure shield shovel 1, the outer peripheral surface of the outer peripheral ring portion 2d of the cutting head 2 is abraded, and as shown on the left side of Fig. 7(a), when the oil of the wear detecting device 21 is When the tip end portion of the pressure pipe 21P is exposed, the oil in the hydraulic pipe 21P leaks to the outside, and the oil pressure in the hydraulic pipe 21P is lowered.

In this manner, the hydraulic pressure of the hydraulic pipe 21P is measured by the hydraulic gauge of the hydraulic circuit of the wear detecting device 21, and the information is transmitted to the control unit of the operation room in the subsequent carriage. In the control unit, an alarm is displayed on the operation monitor in the operating room. As a result, it is determined that the outer peripheral surface of the outer peripheral ring portion 2d is worn to a predetermined amount (thickness), and as shown on the right side of Fig. 7(a), it is determined that the protruding portion of the protective drill 4d is also worn.

Therefore, in the present embodiment, at the stage of detecting the abrasion of the outer peripheral ring portion 2d, as shown in the right side of Fig. 7(b), the piston 20p of the jack 20 is extended to a predetermined length to protect Drill The protruding height of the head 4d protrudes to the state before the abrasion, that is, to the position of the standard line Ls.

In the shieldless excavator studied by the inventors, the protective drill bit is welded to the outer peripheral portion of the cutting head, so when the drill bit is worn, the protective drill bit must be separated from the outer peripheral ring portion, and the new protective drill bit is re-repaired. welding. In addition, it is necessary to visually confirm the wear state of the protective drill bit on the excavation surface. Therefore, the wear confirmation and replacement work of the protection drill bit can interrupt the excavation work for a long period of time, which is the main reason for hindering the long-distance construction of the shield excavator.

Especially when using the shield shield excavator to excavate the gravel layer and the cobble layer, the environment of the cutting head is not good, and the frequency of replacement of the drill bit does not depend on the wear of the main drill bit in front of the cutting head, but mostly depends on the cutting head. The peripheral ring of the outer ring protects the wear of the drill bit. Therefore, in the excavation work under the condition of poor environment, how to reduce the wear confirmation and replacement frequency of the protective drill bit of the peripheral ring portion of the cutting head to achieve long-distance construction of the shield excavator is an important issue.

In contrast, in the earth pressure shield shovel 1 of the present embodiment, the state of the protective drill 4d can be grasped without causing the wear state of the protective drill 4d to appear on the excavation surface. That is, the confirmation work for protecting the wear of the drill bit 4d can be omitted.

Further, after the wear of the protective drill 4d is confirmed, the protruding height of the protective drill 4d can be adjusted, so that the life of the protective drill 4d can be improved. Therefore, the frequency of replacement of the protection bit 4d can also be reduced under conditions of poor environment.

In this way, the long-distance construction of the earth pressure shield shield excavator 1 can also be promoted under the conditions of poor environment.

(Second embodiment)

In the second embodiment, a configuration example in which the protruding height of the protective drill can be adjusted to a plurality of stages will be described.

Fig. 8 (a) and (b) are cross-sectional views showing main parts of a peripheral ring portion of a cutting head according to a second embodiment. In addition, in FIG. 8(b), hatching is omitted in order to make it easy to see a figure.

In the present embodiment, two hydraulic pipings 21Pa and 21Pb having different end positions (abrasion detecting positions D1 and D2) are disposed inside the peripheral ring portion 2d of the cutting head 2. Here, in the case of the case, the depth from the outer circumferential surface of the outer circumferential ring portion 2d to the tip end portion of the hydraulic pressure pipe 21Pa is shallower than the depth from the tip end portion of the hydraulic pressure pipe 21Pb. The other configurations are the same as those of the first embodiment described above, and thus the description thereof will be omitted.

Next, the adjustment of the protruding height of the protective drill 4d of the second embodiment will be described with reference to Figs. 9 and 10. Figs. 9 and 10(a) and Fig. 10(b) are cross-sectional views showing the main portions of the outer peripheral ring portion of the cutting head in the projection height adjustment work for protecting the drill. In addition, in (a) and (b) of FIG. 9 and FIG. 10, the left side shows the abrasion detecting part, and the right side shows the protection bit arrangement part.

In the excavation work performed by the earth pressure shield shovel 1, the outer peripheral surface of the outer peripheral ring portion 2d of the cutting head 2 is abraded, and as shown on the left side of Fig. 9(a), the tip of the hydraulic pipe 21Pa When the part is exposed, the oil in the hydraulic piping 21Pa leaks to the outside and the oil pressure in the hydraulic piping 21Pa reduce.

In the same manner as in the first embodiment, the information on the hydraulic pressure reduction in the hydraulic pressure pipe 21Pa is transmitted from the hydraulic circuit of the abrasion detecting device 21 to the control unit of the operation room, and the content is displayed as an alarm. Indoor operation monitor. Here, it is determined that the outer peripheral surface of the outer peripheral ring portion 2d is worn to a predetermined amount (thickness), and as shown on the right side of Fig. 9(a), it is determined that the protruding portion of the protective drill 4d is also worn.

Therefore, in the present embodiment, at the stage of detecting the abrasion of the outer peripheral ring portion 2d, as shown on the right side of Fig. 9(b), the piston 20p of the jack 20 is extended to a predetermined length, and The protruding height of the protection drill 4d protrudes to the position of the standard line Ls in the state before the abrasion.

Next, after the protruding height of the protective drill 4d is adjusted, the excavation work of the earth pressure shield shovel 1 is restarted. In the excavation work after the restarting, the outer peripheral surface of the outer peripheral ring portion 2d of the cutting head 2 is again worn out, and when the tip end portion of the hydraulic pipe 21Pb is exposed as shown on the left side of Fig. 10(a) The oil in the hydraulic pipe 21Pb leaks to the outside and the oil pressure in the hydraulic pipe 21Pb is lowered.

In this manner, as described above, the information on the hydraulic pressure drop in the hydraulic pressure pipe 21Pb is transmitted from the hydraulic circuit of the abrasion detecting device 21 to the control unit, and the content is displayed as an alarm on the operation monitor. Here, it is determined that the outer peripheral surface of the outer peripheral ring portion 2d is worn to a predetermined amount (thickness), and as shown on the right side of Fig. 10(a), it is determined that the protruding portion of the protective drill 4d is also worn.

Therefore, in the present embodiment, at the stage of detecting the abrasion of the outer peripheral ring portion 2d, as shown in the right side of Fig. 10(b), the piston 20p of the jack 20 is extended to a predetermined length. The protruding height of the protection drill 4d protrudes to the position of the standard line Ls.

As described above, in the present embodiment, the protruding height of the protective drill 4d can be changed in two stages, so that the life of the protective drill 4d can be improved more than in the first embodiment. Therefore, the frequency of replacement of the protective bit 4d can be further reduced even under conditions of poor environment. Therefore, the long-distance construction of the earth pressure shield shovel 1 can be further promoted even under the conditions of poor environment.

(Third embodiment)

In the third embodiment, an alternative example of the configuration of the protective drill will be described. In the first and second embodiments, the case where the protruding height of the protective bit is adjusted by the hydraulic jack is described. In the present embodiment, the case where the operator adjusts the protruding height of the drill bit will be described.

Fig. 11 is a cross-sectional view showing a main part of a peripheral ring portion of a cutting head according to a third embodiment. Further, the left side of Fig. 11 shows the wear detecting unit, and the right side shows the protective bit arrangement unit.

In the present embodiment, the rear end portion (the end portion opposite to the end portion on the excavation surface side) of the protective drill 4d is joined to the base (height adjusting means) 24. The base 24 is supported by a mounting table (height adjusting means) 23 in a state in which, for example, two partition plates (height adjusting means) 25a, 25b are interposed between the base 24 and the mounting table 23. The base 24 and each of the partition plates 25a, The 25b is fixed to the mounting table 23 in a state of being detachably attached by bolts (height adjustment means) 26.

The thickness of the partition plates 25a and 25b is set in accordance with the wear detecting position of the hydraulic pressure pipes 21Pa and 21Pb of the outer peripheral ring portion 2d. In other words, the thickness of the partition plates 25a and 25b is such that the tip end portion (end portion on the excavation surface side) of the drill bit 4d is protected from the outer periphery of the outer peripheral ring portion 2d in accordance with the amount of wear (thickness) of the outer peripheral portion of the outer peripheral ring portion 2d. Set the way to stand out.

Next, the adjustment of the protruding height of the protective drill 4d of the third embodiment will be described with reference to Figs. 12 and 13 . Figs. 12 and 13(a) and Fig. 13(b) are cross-sectional views showing essential parts of the outer peripheral ring portion of the cutting head in the projection height adjustment work for protecting the drill.

In the excavation work of the earth pressure submersible excavator 1, the outer peripheral surface of the outer peripheral ring portion 2d of the cutting head 2 is abraded, and as shown on the left side of Fig. 12(a), the tip end portion of the hydraulic pipe 21Pa is exposed. At this time, the oil in the hydraulic pipe 21Pa leaks to the outside, and the oil pressure in the hydraulic pipe 21Pa is lowered.

In the same manner as in the first embodiment, the information on the hydraulic pressure reduction in the hydraulic pressure pipe 21Pa is transmitted from the hydraulic circuit of the abrasion detecting device 21 to the control unit of the operation room, and the content is displayed as an alarm. Indoor operation monitor. Here, it is determined that the outer peripheral surface of the outer peripheral ring portion 2d is worn to a predetermined amount (thickness), and as shown on the right side of Fig. 12(a), it is determined that the protruding portion of the protective drill 4d is also worn.

Therefore, in the present embodiment, the outer peripheral ring portion is detected. At the stage of wear of 2d, the operator enters the back side of the spoke portion 2b, as shown on the right side of Fig. 12(b), the bolt 26 is removed, and after one piece of the partition plate 25a is removed, the base 24 and the partition plate 25b are bolted 26 It is fixed to the mounting table 23. In this way, the protruding height of the protective bit 4d is projected to the position of the standard line Ls.

Next, after the protruding height of the protective drill 4d is adjusted, the excavation work of the earth pressure shield shovel 1 is resumed. In the excavation work after the restarting, the outer peripheral surface of the outer peripheral ring portion 2d of the cutting head 2 is further worn. As shown on the left side of Fig. 13(a), when the tip end portion of the hydraulic pipe 21Pb is exposed, The oil in the hydraulic piping 21Pb leaks to the outside and the oil pressure in the hydraulic piping 21Pb is lowered.

In this manner, as described above, the information on the hydraulic pressure drop in the hydraulic pressure pipe 21Pb is transmitted from the hydraulic circuit of the abrasion detecting device 21 to the control unit, and the content is displayed as an alarm on the operation monitor. Here, it is determined that the outer peripheral surface of the outer peripheral ring portion 2d is worn to a predetermined amount (thickness), and as shown on the right side of Fig. 13(a), it is determined that the protruding portion of the protective drill 4d is also worn.

Therefore, in the same manner as described above, the operator enters the back side of the spoke portion 2b, as shown on the right side of Fig. 13(b), the bolt 26 is removed, and after the remaining partition plate 25b is removed, the base 24 is fixed to the mounting by the bolt 26. The table 23 thereby causes the protruding height of the protective bit 4d to protrude to the position of the standard line Ls.

As described above, in the present embodiment, in addition to the effects that can be obtained in the first embodiment, the following effects can be obtained. That is, indeed Since the protruding height of the protective drill 4d can be adjusted to two stages after the wear of the protective drill 4d, the life of the protective drill 4d can be improved as compared with the first embodiment. Therefore, even under the condition of poor environment, the frequency of replacement of the protective drill bit 4d can be further reduced, so that the long distance construction of the earth pressure shield shield excavator 1 can be further promoted.

(Fourth embodiment)

In the fourth embodiment, an alternative example of the wear detecting device will be described. In the first to third embodiments, the case where the accumulator type wear detecting device is used will be described. In the present embodiment, the case of using the general-purpose wear detecting device will be described.

Fig. 14(a) is a cross-sectional view showing a main part of an outer peripheral ring portion of a cutting head according to a fourth embodiment, and Fig. 14(b) is an enlarged sectional view showing a main part of the wear detecting unit of Fig. 14(a). . Further, the left side of Fig. 14(a) shows the wear detecting unit, and the right side shows the protective bit arrangement unit.

In the present embodiment, the wear detecting device 21 that detects the wear of the outer peripheral ring portion 2d of the cutting head 2 is constituted by, for example, a general-purpose wear detecting device having a sensor portion 21Ca and a ring portion 21Cb.

When the sensor portion 21Ca is worn by the tip end portion due to wear of the outer peripheral ring portion 2d, the conduction state (current value, resistance value, etc.) changes depending on the amount of wear (thickness), and the conduction is transmitted through the wiring 21L. The status information is transmitted to the control unit in the above operation room. The control unit detects the wear state of the outer circumferential ring portion 2d based on the information from the sensor portion 21Ca, and displays the wear state on the operation monitor. Then, the control unit determines that the value from the conduction state of the sensor unit 21Ca is determined in advance. At the stage of the value, the wear of the protective bit 4d is judged, and this condition is displayed as a warning on the operation monitor.

The ring portion 21Cb is provided to protect the portion of the sensor portion 21Ca such that the conduction state of the sensor portion 21Ca does not change due to wear, and is provided so as to surround the outer circumference of the sensor portion 21Ca.

The other configurations are the same as those of the first embodiment, and the description thereof is omitted. In addition, the protective drill 4d is the same as the above-described first embodiment, but may be the same as the third embodiment.

Next, the adjustment of the protruding height of the protective drill 4d of the fourth embodiment will be described with reference to Fig. 15. Fig. 15 (a) and (b) are cross-sectional views showing a main part of a peripheral ring portion of a cutting head in a projection height adjustment operation for protecting a drill.

In the excavation work performed by the earth pressure shield shovel 1, the outer peripheral surface of the outer peripheral ring portion 2d of the cutting head 2 is abraded, as shown on the left side of Fig. 15(a), when the wear detecting device 21 senses When the tip end portion of the portion 21Ca is worn, the conduction state (current value and resistance value) of the sensor portion 21Ca changes.

In this way, the information on the change in the on state is transmitted to the control unit of the operation room, and the content is displayed as an alarm in the operation monitor at the stage of displaying the value of the on state at a predetermined value. . Here, it is determined that the outer peripheral surface of the outer peripheral ring portion 2d is worn to a predetermined amount (thickness), and as shown on the right side of Fig. 15(a), it is determined that the protruding portion of the protective drill 4d is also worn.

Therefore, in the present embodiment, the outer peripheral ring portion is detected. In the stage of wear of 2d, as shown on the right side of Fig. 15(b), the piston 20p of the jack 20 is extended to a predetermined length, and the protruding height of the protective bit 4d is projected to the position of the standard line Ls.

Next, after the protruding height of the protective drill 4d is adjusted, the excavation work of the earth pressure shield shovel 1 is restarted. In the excavation work after the restarting, the outer peripheral surface of the outer peripheral ring portion 2d of the cutting head 2 is further worn, and when the tip end portion of the sensor portion 21Ca is further worn, the conduction state of the sensor portion 21Ca is again Variety. In this way, the information indicating the change of the ON state is transmitted to the control unit of the operation room, and the value indicating the ON state is a predetermined value, and the content is displayed as an alarm in the operation monitor in the operation room. . In this manner, as described above, it is determined that the protruding portion of the protective drill 4d is worn out, so that the piston 20p of the jack 20 is further extended to a predetermined length, and the protruding height of the protective drill 4d is protruded to the standard line Ls. s position.

As described above, in the present embodiment, in addition to the effects that can be obtained in the first embodiment, the following effects can be obtained. In other words, when the above-described general-purpose wear detecting unit is used, since the oil is not used, the configuration of the wear detecting device according to the first embodiment is simplified, and the earth pressure shield shovel 1 can be introduced at low cost. Further, in the case of the general-purpose wear detecting unit, since the wear state can be detected more precisely, the protruding height of the protective drill 4d can be adjusted in a plurality of stages.

As described above, the invention developed by the inventors of the present invention has been specifically described based on the embodiments, but the embodiments disclosed in the present specification are All aspects are illustrative and are not to be construed as limited by the disclosed technology. In other words, the technical scope of the present invention is not limited by the description of the foregoing embodiments, and should be construed only in accordance with the description of the scope of the claims, without departing from the technology and the technology described in the claims. All changes are included in the scope of the patent application.

For example, in the above-described embodiment, the case of using a belt-type screw type screw conveyor will be described. However, the present invention is not limited thereto, and various types of rotation can be used. For example, a belt type and a shaft type screw conveyor can be used. .

Further, in the above-described embodiment, the case where the accumulative wear detecting unit and the guide wear detecting unit are used as the wear detecting device of the outer peripheral ring portion of the cutting head is described. However, the present invention is not limited thereto, and for example, Use an ultrasonic thickness gauge. At this time, the wear state of the outer peripheral portion of the outer peripheral ring portion can be measured instantaneously by providing an ultrasonic thickness meter on the inner peripheral side of the outer peripheral portion of the cutting head. Further, at least two of the accumulative wear detecting unit, the conductive wear detecting unit, or the ultrasonic thickness meter may be used in combination.

Further, in the above-described embodiment, the wear detecting portion (the tip end of the hydraulic pressure pipe 21P and the detecting portion 21C, etc.) such as the accumulative wear detecting portion and the guide wear detecting portion are provided on the tip end side of the spoke portion. In the case of the outer peripheral ring portion, the wear detecting portion (the tip end of the hydraulic pressure pipe 21P and the detecting portion 21C) may be provided in the outer peripheral ring portion between the adjacent portions of the spoke portion. When the wear detecting portion and the protective bit are disposed between the adjacent spoke portions, the distance between them is close to each other, so that the wear state of the protective bit can be more accurately detected.

Further, in the above-described embodiment, the protective drill is disposed between the adjacent portions of the spoke portions. However, the present invention is not limited thereto, and the protective drill may be provided on the outer peripheral portion of the tip end side of the spoke portion. When the wear detecting portion and the protective bit are disposed on the tip end side of the spoke portion, the distance between them is close to each other, so that the wear state of the protective bit can be more accurately detected. Furthermore, the protective drill bit and its driving machine can be hidden on the back side of the spoke portion, so that it can be protected from large pebbles and dirt.

(industrial availability)

In the above description, the present invention is applied to the case of the earth pressure shield shield excavator of the intermediate support drive type, but the present invention is not limited thereto, and may be applied to, for example, the center shaft drive method and the outer peripheral support drive method. Other submersible excavators such as earth pressure shield shield excavators.

Claims (7)

A cutter disk for a shield shovel, comprising: a protective drill which is provided on the outer peripheral ring portion from a peripheral ring portion of the cutter disk while being movable in a radial direction of a cutter disk of the shield shovel; The outer peripheral ring portion is protected; the detecting means detects the wear state of the outer peripheral ring portion according to the wear of the detecting portion provided in the outer peripheral ring portion; and the height adjusting means is based on the information detected by the detecting means. Adjusting the protruding height of the protective drill from the outer peripheral ring portion; wherein the detecting means detects the wear state of the wear state of the outer peripheral ring portion in accordance with the state in which the fluid pressure is lowered due to the abrasion of the detecting portion. Detection device. A cutter disk for a shield shovel, comprising: a protective drill which is provided on the outer peripheral ring portion from a peripheral ring portion of the cutter disk while being movable in a radial direction of a cutter disk of the shield shovel; The outer peripheral ring portion is protected; the detecting means detects the wear state of the outer peripheral ring portion according to the wear of the detecting portion provided in the outer peripheral ring portion; and the height adjusting means is based on the information detected by the detecting means. Adjusting the protruding height of the protective bit protruding from the outer peripheral ring portion; wherein the detecting means detects the wear of the outer peripheral ring portion according to a state in which the conductive state changes due to abrasion of the detecting portion. State of the art wear detection device. The tool disk of the shield excavator according to claim 1 or 2, wherein the height adjusting means is configured to adjust the protruding height of the protection bit in a plurality of stages in accordance with the information detected by the detecting unit. A shield shovel is provided with a cutter disc according to any one of the first to third aspects of the invention. A method for adjusting a height of a protection drill bit of a peripheral ring portion of a tool disk for protecting a shield excavator, comprising: detecting an abrasion of the outer circumferential ring portion by a detecting portion of a peripheral ring portion provided outside a cutter disk of the shield shield excavator And a step of adjusting a protruding height of the protective bit protruding from the outer peripheral surface of the outer peripheral ring portion for protecting the outer peripheral ring portion according to the information detected by the detecting portion; wherein the information is referred to as The fluid pressure of the detection portion is reduced by abrasion. A method for adjusting a height of a protection drill bit of a peripheral ring portion of a tool disk for protecting a shield excavator, comprising: detecting an abrasion of the outer circumferential ring portion by a detecting portion of a peripheral ring portion provided outside a cutter disk of the shield shield excavator And a step of adjusting a protruding height of the protective bit protruding from the outer peripheral surface of the outer peripheral ring portion for protecting the outer peripheral ring portion, according to the information detected by the detecting portion; The aforementioned information refers to a conduction state in which a change occurs due to abrasion of the aforementioned detecting portion. The method for adjusting the height of the protection bit of the peripheral ring portion of the tool disk of the protection shield excavator according to the fifth or sixth aspect of the invention, wherein the protruding height of the protection bit is adjusted in multiple stages according to the above information.