JP7299866B2 - How to diagnose tail brush - Google Patents

Description

The present invention relates to a method for diagnosing tail brushes.

Generally, a tunnel excavator excavates a tunnel by rotating a cutter head and forming a face on the ground ahead with a plurality of cutters attached to the front surface of the cutter head. The cutter head is attached to the front end of a cylindrical excavator body, and the tunnel is excavated by propelling the excavator body forward. The inner wall of the excavated tunnel is lined with segments that are assembled in an annular fashion. At the rear in the excavator body, a segment is added to the front end of the existing segment as the excavator body advances.

Here, a tail brush is provided between the inner circumference of the rear end portion of the excavator body and the outer circumference of the segment. The tail brush is provided on the inner circumference of the rear end portion of the excavator main body and is in sliding contact with the outer circumference of the segment. The tail brush is provided to prevent entry of water, earth and sand, backfill material, etc. (hereinafter also referred to as entry of water, etc.) into the body of the excavator. However, due to, for example, a shortage of the amount of tail grease (hereinafter simply referred to as grease) of the tail brush, the water stopping performance of the tail brush (that is, the intrusion of water into the excavator body) performance to prevent Therefore, for example, as disclosed in Japanese Unexamined Patent Application Publication No. 2002-100001, a technique for detecting the intrusion of water or the like into the body of an excavator has been proposed.

JP 2008-297821 A

However, the conventional techniques disclosed in Patent Document 1 and the like do not diagnose the state of the tail brush itself. Diagnosing the state of the tail brush is important in determining the factors that reduce the water stopping performance of the tail brush and in taking countermeasures according to the factors. Therefore, it is expected that safe tunnel construction can be realized by properly diagnosing the state of the tail brush.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a tail brush diagnostic method capable of appropriately diagnosing the state of a tail brush.

In order to solve the above-mentioned problems, a tail brush diagnostic method of the present invention provides a tunnel excavator having a cylindrical excavator body having a cutter head attached to the front end thereof. A method for diagnosing a tail brush provided between an outer periphery of a segment, comprising: an obtaining step of obtaining a repulsive force of the tail brush acting on the outer periphery of the segment and a sliding resistance between the tail brush and the segment; A calculating step of calculating the coefficient of friction between the tail brush and the segment based on the repulsive force and the sliding resistance obtained in the obtaining step, and a state of the tail brush based on the coefficient of friction calculated in the calculating step. and a diagnostic step of diagnosing.

In the diagnosis step, when the coefficient of friction is equal to or less than the first threshold value, the tail brush is diagnosed as being in a normal state capable of preventing water, sand, or backfill material from entering the body of the excavator, and the coefficient of friction is determined to be the first threshold value. If it is greater than 1 threshold, it may be diagnosed that the tail brush is in an abnormal state that is not in a normal state.

In the diagnosis step, if the coefficient of friction is greater than the first threshold and is equal to or less than a second threshold that is greater than the first threshold, the amount of grease in the tail brush is insufficient, or foreign matter is present in the tail brush. may be diagnosed as invading.

In the diagnosis step, when the coefficient of friction is greater than the first threshold and is equal to or less than the second threshold, the amount of grease supplied to the tail brush is increased, and the amount of grease supplied to the tail brush is increased. If the coefficient of friction does not decrease in spite of this, it may be diagnosed that foreign matter has entered the tail brush.

In the diagnosing step, if the coefficient of friction is greater than the first threshold and is greater than a second threshold that is larger than the first threshold, it may be diagnosed that a foreign object is stuck to the tail brush.

In the diagnosis step, it may be diagnosed whether or not the amount of bristles of the tail brush has decreased with respect to the reference amount of bristles, based on at least one of the repulsive force, the sliding resistance, and the coefficient of friction.

In the acquiring step, the repulsive force may be indirectly acquired based on the size of the tail clearance between the inner circumference of the rear end of the excavator body and the outer circumference of the segment.

In the obtaining step, the sliding resistance may be indirectly obtained by subtracting components other than the sliding resistance from the total thrust resistance of the excavator body.

The segment or tunnel excavator is provided with a repulsive force detection unit that detects repulsive force, and in the obtaining step, the repulsive force may be directly obtained based on the detection result of the repulsive force detection unit.

The segment or tunnel excavator is provided with a sliding resistance detection unit for detecting sliding resistance, and in the acquisition step, the sliding resistance is directly acquired based on the detection result of the sliding resistance detection unit. may

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to diagnose the state of a tail brush appropriately.

BRIEF DESCRIPTION OF THE DRAWINGS It is a cross-sectional schematic diagram which shows the whole structure of the tunnel excavator which concerns on embodiment of this invention. FIG. 3 is a partially enlarged view showing the configuration of the tail brush and its surroundings in the tunnel excavator according to the embodiment of the present invention; 4 is a flow chart showing a first example of a processing flow of a tail brush diagnostic method according to an embodiment of the present invention; FIG. 5 is a flow chart showing a second example of the processing flow of the tail brush diagnostic method according to the embodiment of the present invention. FIG.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are given the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are omitted from the drawings. do.

<Configuration of Tunnel Excavator>
A tunnel excavator 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.

First, referring to FIG. 1, the overall configuration of a tunnel excavator 1 will be described. FIG. 1 is a schematic cross-sectional view showing the overall configuration of a tunnel excavator 1. As shown in FIG. An arrow A1 in FIG. 1 indicates the traveling direction of the tunnel excavator 1. As shown in FIG. Hereinafter, the traveling direction of the tunnel excavator 1 is also referred to as the forward direction, and the opposite direction to the traveling direction is also referred to as the rearward direction.

The tunnel excavator 1 is an earth pressure type (including mud pressure type) shield excavator capable of excavating the ground G. As shown in FIG. As shown in FIG. 1 , the tunnel excavator 1 includes an excavator body 10 . The excavator main body 10 has a tubular shape (for example, a cylindrical shape, a rectangular tubular shape, or the like). The axial direction of the excavator main body 10 coincides with the traveling direction of the tunnel excavator 1 . Hereinafter, the axial direction of the excavator body 10 is also simply referred to as the axial direction, the radial direction of the excavator body 10 is simply referred to as the radial direction, and the circumferential direction of the excavator body 10 is simply referred to as the circumferential direction.

A cutter head 11 is provided at the front end of the excavator body 10 . The cutter head 11 is a substantially disk-shaped rotating body. A front end of a cutter center shaft 12 is fitted in the center of the cutter head 11 , and the cutter head 11 is rotatably supported around the cutter center shaft 12 .

The cutter head 11 has an outer ring 11a, an inner ring 11b, cutter spokes 11c, a fishtail cutter 11d, a cutter bit 11e, and the like. Of these, the outer ring 11a forms the outer circumference of the cutter head 11, and the inner ring 11b is arranged radially inward of the outer ring 11a. A plurality of cutter spokes 11 c are arranged radially around the cutter center axis 12 on the front surface of the cutter head 11 . A fishtail cutter 11 d is attached to the center of the front surface of the cutter head 11 . Furthermore, a large number of cutter bits 11e are attached to the front surface of the cutter spoke 11c. The fishtail cutter 11d and the cutter bit 11e may or may not be detachable.

A plurality of openings are formed in the cutter head 11 between the outer ring 11a, the inner ring 11b and the cutter spokes 11c. The opening functions as an excavated earth and sand inlet for taking excavated earth and sand generated when the ground G (face) is excavated by the cutter head 11 into the excavator main body 10 (into a chamber 17 described later).

A partition wall 13 is arranged behind the cutter head 11 in the excavator body 10 . The partition 13 is a plate-like (for example, disk-like) wall body arranged perpendicular to the direction of extension of the tunnel, and the outer peripheral edge of the partition 13 is attached to the inner peripheral surface of the excavator main body 10 . The cutter head 11 and the partition wall 13 are arranged with a predetermined gap in the axial direction (tunnel extending direction). Various equipment of the tunnel excavator 1 are arranged on the rear side of the partition wall 13, and the partition wall 13 isolates the equipment from the excavated earth and sand generated at the face. A discharge port 13a, which is an opening for discharging the excavated earth and sand, is formed in the lower portion of the partition wall 13 .

A cutter center shaft 12 is rotatably supported at the center of the partition wall 13 . Further, an annular rotating ring 14 is supported by the partition wall 13 so as to be rotatable about the cutter center axis 12 . A plurality of connecting beams 15 are provided in the front portion of the rotating ring 14 at predetermined intervals in the circumferential direction. A plurality of connecting beams 15 connect the cutterhead 11 and the rotating ring 14 . The front end of the connecting beam 15 is connected to the connecting portion between the inner circumferential ring 11b of the cutter head 11 and the cutter spokes 11c. On the other hand, a ring gear 14a is provided at the rear portion of the rotating ring 14. As shown in FIG. The ring gear 14a may be of an external tooth type or an internal tooth type. Furthermore, a cutter turning motor 16 is provided behind the partition wall 13 . A driving gear 16 a of the cutter turning motor 16 meshes with a ring gear 14 a of the rotating ring 14 .

By driving the cutter turning motor 16, the rotation of the driving gear 16a is transmitted from the ring gear 14a to the rotating ring 14 and the connecting beam 15. As shown in FIG. Thereby, the cutter head 11 can be rotated around the cutter center axis 12 . As a result, the ground G can be excavated by pressing the front surface of the rotating cutter head 11 against the ground G (face).

A chamber 17 is defined between the cutter head 11 and the partition wall 13 . The chamber 17 is a space (for example, a substantially cylindrical space) defined by the rear surface of the cutter head 11 , the front surface of the partition wall 13 , and the inner peripheral surface of the excavator body 10 . Excavated earth and sand generated as the ground G is excavated by the cutter head 11 is taken into the chamber 17 through the opening (excavated earth and sand inlet) formed through the cutter head 11 . The chamber 17 functions as a space (chamber) for temporarily storing excavated soil. The excavated earth and sand taken into the chamber 17 is discharged from the chamber 17 into the screw conveyor 18 through the discharge port 13 a provided at the bottom of the partition wall 13 .

The screw conveyor 18 is provided on the rear side of the partition wall 13 inside the excavator body 10 . The screw conveyor 18 is disposed in the excavator main body 10 so as to be inclined upward toward the rear side. An opening at the front end of the screw conveyor 18 is connected to the discharge port 13 a of the partition wall 13 . Thereby, the internal space of the screw conveyor 18 communicates with the chamber 17 through the discharge port 13 a of the partition wall 13 . Inside the screw conveyor 18, there is provided a screw vane 18a which is a screw-shaped rotating body having spiral vanes. By rotationally driving the screw blades 18a, the excavated earth and sand accumulated in the chamber 17 can be taken into the screw conveyor 18, conveyed toward the rear of the excavator main body 10, and discharged.

Further, an erector device (not shown) is provided on the rear side of the partition wall 13 of the excavator body 10 . The erector device is provided movably in the axial direction, radial direction and circumferential direction of the excavator body 10 (that is, tunnel extending direction, tunnel radial direction and tunnel circumferential direction). The erector device is capable of gripping the segment S, which is a lining member, and assembles the gripped segment S along the inner wall surface of the tunnel T (pit wall).

The segment S is a ring piece having a curved shape along the inner wall surface of the tunnel T excavated. By driving the erector device, a plurality of segments S can be annularly assembled along the circumferential direction. Thereby, the inner wall surface of the tunnel T is lined with a plurality of segments S, and collapse of the inner wall surface can be prevented.

A plurality of shield jacks 19 are provided in the excavator main body 10 at intervals in the circumferential direction. Each shield jack 19 is provided along the inner peripheral surface of the excavator main body 10 so as to extend in the tunnel extending direction. The shield jack 19 is, for example, a hydraulic jack, but other types of jacks, actuators, or the like may be used as long as they can generate thrust for the tunnel excavator 1 . At the rear end of the shield jack 19, an extendable drive rod 19a is provided. The tip of the drive rod 19a faces the front end face of the existing segment S. As shown in FIG. By extending the drive rod 19a of the shield jack 19 rearward and pressing the segment S, a propulsion reaction force (that is, a thrust force) can be applied to the excavator body 10 . That is, the thrust generated when the shield jack 19 presses the segment S allows the excavator main body 10 to move forward.

The tunnel excavator 1 shown in FIG. 1 is a tunnel excavator of the type in which thrust is transmitted from the front end of the shield jack 19 to the excavator main body 10. Not limited. For example, the tunnel excavator according to the present invention may be a tunnel excavator of a type in which thrust is transmitted from the rear portion of the shield jack 19 to the excavator main body 10 . The tunnel excavator according to the present invention may be a tunnel excavator of a type that has a center-folding function and is propelled by pushing the front body. It may be a type of tunnel excavator that is propelled by being pushed. Further, the tunnel excavator according to the present invention is a tunnel excavator in which the drive system of the cutter head 11 is a system other than the intermediate support system shown in FIG. There may be.

At the rear portion of the excavator body 10, a new segment S is added to the front end of the existing segment S as the excavator body 10 advances. As a result, the state in which the segment S is arranged radially inward with respect to the rear end portion of the excavator main body 10 is maintained. A tail brush 20 is provided between the inner circumference of the rear end portion of the excavator body 10 and the outer circumference of the segment S. The tail brush 20 is attached to the inner circumference of the rear end portion of the excavator main body 10 and is in sliding contact with the outer circumference of the segment S. The tail brush 20 is provided to prevent water or the like from entering the excavator main body 10 (specifically, water, earth and sand, backfill material, or the like).

FIG. 2 is a partially enlarged view showing the configuration of the tail brush 20 and its surroundings in the tunnel excavator 1. As shown in FIG. As shown in FIG. 2, the excavator main body 10 is provided with three rows of tail brushes 20A, 20B, and 20C. However, the number of tail brushes 20 provided on the excavator main body 10 may be other than three rows. The tail brush 20 includes a wire brush (that is, a brush in which a large number of metal wires are bundled) arranged annularly along the circumferential direction of the excavator main body 10, and a wire brush extending radially inward with respect to the wire brush. Including spring steel, etc. that imparts a biasing force. In the natural state of the wire brush, the tip of the wire brush is positioned radially inside the outer periphery of the segment S. Therefore, the wire brush is spread by the outer periphery of the segment S, is in close contact with the outer periphery of the segment S, and is pressed by the restoring force of the wire brush itself. The base of the tail brush 20 is fixed to the inner circumference of the excavator main body 10 by welding or bolting, and the tip of the tail brush 20 (specifically, the tip of the wire brush) is the tail brush 20 itself. is pressed against the outer circumference of the segment S by the restoring force of . As a result, a repulsive force N (pressing force), which will be described later, is generated. The tail brushes 20A, 20B, and 20C are provided in this order from the front at intervals in the axial direction of the excavator main body 10 .

Behind the excavator main body 10, the inner wall surface of the tunnel T and the outer periphery of the segment S face each other. A gap 21 between the inner wall surface of the tunnel T and the outer periphery of the segment S is filled with a backing material 22 such as mortar. The segment S is thereby fixed to the tunnel T. FIG. Here, between the inner circumference of the rear end portion of the excavator body 10 and the outer circumference of the segment S, there is a tail clearance C which is an annular gap. Therefore, water or the like existing outside the excavator body 10 may enter the excavator body 10 through the gap 21 and the tail clearance C. Intrusion of water or the like into the excavator body 10 can be prevented by the tail brush 20 .

Grease supply passages 23A and 23B are formed in the wall portion of the excavator main body 10 . The grease supply paths 23A and 23B are connected to a grease supply pump (not shown). Grease delivered from the grease supply pump flows through the grease supply paths 23A and 23B. The grease supply paths 23A, 23B are connected to discharge ports 24, 25, which are openings formed in the inner circumference of the excavator main body 10, respectively. The outlet 24 communicates with a space 26 defined between the tail brushes 20A and 20B. Grease discharged from the discharge port 24 is supplied to the space 26 . The outlet 25 communicates with a space 27 defined between the tail brushes 20B and 20C. Grease discharged from the discharge port 25 is supplied to the space 27 . The amount of grease ejected from the ejection port 24 and the amount of grease ejected from the ejection port 25 may be individually adjustable. By discharging the grease from the discharge ports 24, 25 and supplying the grease to the tail brush 20, the space inside the tail brush 20 and the space between the tail brushes 20 are filled with the grease, and the water stopping performance of the tail brush 20 is improved. can be done. The grease also plays a role in reducing friction between the tail brush 20 and the segment S.

A force sensor 28 is provided on the outer periphery of the segment S. The force sensor 28 functions as a repulsive force detection section that detects the repulsive force N of the tail brush 20 acting on the outer circumference of the segment S. The repulsive force N is a radial force generated by pressing the tail brush 20 against the outer periphery of the segment S in the radial direction. Specifically, the repulsive force N detected by the force sensor 28 is a radially inward force acting on the outer circumference of the segment S, as shown in FIG. Note that the tail brush 20 is acted upon by a reaction force of a radially inwardly directed force acting on the outer periphery of the segment S (that is, a radially outwardly directed force). Specifically, the repulsive force N includes a component that changes according to the size of the tail clearance C and a component that changes according to the differential pressure across the tail brush 20 . The force sensor 28 detects the repulsive force N of the tail brush 20 by straining and deforming in the radial direction, for example, and detecting the amount of strain in the radial direction as a change in electrical resistance.

Further, the force sensor 28 functions as a sliding resistance detection section that detects the sliding resistance F between the tail brush 20 and the segment S. The sliding resistance F is an axial force generated as the excavator body 10 moves forward. Specifically, the sliding resistance F detected by the force sensor 28 is a force that acts on the outer circumference of the segment S and acts on the front side in the axial direction, as shown in FIG. Note that the tail brush 20 is acted upon by the reaction force of the axially frontward force acting on the outer periphery of the segment S (that is, the axially rearward force). The force sensor 28 is distorted and deformed in the axial direction, for example, and detects the sliding resistance F by detecting the amount of strain in the axial direction as a change in electrical resistance.

As described above, in the example shown in FIG. 2, the force sensor 28, which is one sensor, realizes both the function of the repulsive force detection section and the function of the sliding resistance detection section. However, a sensor (for example, soil pressure gauge) functioning as a repulsive force detection section and a sensor (for example, a sliding resistance sensor) functioning as a sliding resistance detection section may be provided separately. In the example shown in FIG. 2, the repulsive force detector and the sliding resistance detector (that is, the force sensor 28) are provided in the segment S. It may be provided on the machine 1 (for example, on the inner circumference of the rear end of the excavator main body 10). In this case, more specifically, the repulsive force detection section and the sliding resistance detection section are provided in the vicinity of the portion of the distal end portion of the tail brush 20 that is pressed against the outer periphery of the segment S (for example, inside the tail brush 20). obtain.

The excavator main body 10 is provided with a tail clearance sensor 29 . The tail clearance sensor 29 detects the size of the tail clearance C between the inner circumference of the rear end portion of the excavator body 10 and the outer circumference of the segment S. The tail clearance sensor 29 detects the size of the tail clearance C by, for example, irradiating the outer circumference of the segment S with ultrasonic waves, light, or the like and receiving the reflected waves. The tail clearance sensor 29 is not limited to the above example, and may be, for example, a sensor that detects the size of the tail clearance C from the front of the segment S. It may be a sensor that detects the size of the tail clearance C based on the amount of movement of . The operator may actually measure the size of the tail clearance C using a measure or the like.

As described above, the tunnel excavator 1 is provided with the tail brush 20 to prevent water or the like from entering the excavator main body 10 . However, for example, the amount of grease in the tail brush 20 (that is, the amount of grease supplied to the tail brush 20) is insufficient, and the like, and the water stop performance of the tail brush may deteriorate. Here, the inventor of the present invention focused on the fact that there is a close relationship between the coefficient of friction μ of the tail brush 20 and the state of the tail brush 20, and it is possible to appropriately diagnose the state of the tail brush 20. I found a way to diagnose it.

<Tail brush diagnosis method>
3 and 4, the processing flow of the diagnostic method for the tail brush 20 according to the embodiment of the present invention will be described.

The diagnostic method for the tail brush 20 according to this embodiment includes an acquisition step, a calculation step, and a diagnostic step. In the obtaining step, the repulsive force N of the tail brush 20 acting on the outer circumference of the segment S and the sliding resistance F between the tail brush 20 and the segment S are obtained. In the calculating step, the coefficient of friction μ between the tail brush 20 and the segment S is calculated based on the repulsive force N and the sliding resistance F obtained in the obtaining step. In the diagnosis step, the state of the tail brush 20 is diagnosed based on the coefficient of friction μ calculated in the calculation step.

Hereinafter, as an example of the processing flow of the diagnostic method for the tail brush 20, the first example and , and a second example in which the repulsive force N and the sliding resistance F are obtained indirectly. In addition, hereinafter, in order to distinguish between the repulsive force N obtained directly and the repulsive force N obtained indirectly, the repulsive force N obtained indirectly will also be specifically referred to as a repulsive force N′.

FIG. 3 is a flow chart showing a first example of the processing flow of the method for diagnosing the tail brush 20. As shown in FIG. The processing flow shown in FIG. 3 is, for example, repeated at preset time intervals. An example in which each process of the process flow shown in FIG. 3 is performed by the operator of the tunnel excavator 1 will be described below, but part or all of the processes of the process flow shown in FIG. It may be performed by a CPU (Central Processing Unit). The CPU includes a ROM (Read Only Memory), which is a storage element that stores programs and operation parameters used by the CPU, and a RAM (Random Access Memory), etc.

In the processing flow shown in FIG. 3, step S101 corresponds to the acquisition step. In the processing flow shown in FIG. 3, step S102 corresponds to the calculation step. In the processing flow shown in FIG. 3, steps S103 to S117 correspond to diagnostic steps.

When the processing flow shown in FIG. 3 is started, in step S101, the operator determines the repulsive force N of the tail brush 20 and the force between the tail brush 20 and the segment S based on the detection result of the force sensor 28. The sliding resistance F is obtained directly.

Next, in step S102, the operator calculates the coefficient of friction μ between the tail brush 20 and the segment S based on the repulsive force N and the sliding resistance F. Specifically, the operator divides the sliding resistance F by the repulsive force N to calculate the coefficient of friction μ (μ=F/N).

Next, in step S103, the operator determines whether or not the coefficient of friction μ is less than or equal to the first threshold.

The first threshold appropriately determines whether or not the coefficient of friction μ is small enough for the tail brush 20 to be in a normal state (that is, to prevent water or the like from entering the excavator main body 10). set to the value obtained. Note that the first threshold value can be appropriately changed according to the specifications (for example, material, size, shape) of the tail brush 20, the material of the segment S, or the like.

If it is determined YES in step S103 (that is, if it is determined that the coefficient of friction μ is equal to or less than the first threshold value), basically it can be diagnosed that the tail brush 20 is in a normal state. However, as will be described later, the tail brush 20 may be worn out (that is, the amount of bristles of the tail brush 20 is reduced relative to the reference amount of bristles). Therefore, if the determination in step S103 is YES, the process proceeds to step S104, and the operator diagnoses that the tail brush 20 is in a normal state or that the tail brush 20 is worn out.

If the determination in step S103 is NO (that is, if the coefficient of friction μ is greater than the first threshold value), the tail brush 20 is diagnosed as being in an abnormal state, as will be described later. . For example, as in step S109, it is diagnosed that the tail brush 20 is stuck with foreign matter, or as in step S110, the amount of grease on the tail brush 20 is insufficient, or there is foreign matter on the tail brush 20. Diagnosed as invading.

After step S104, in step S105, the operator determines whether or not the repulsive force N is smaller than the reference repulsive force.

Here, the inventor of the present invention focused on the fact that there is considered to be a close relationship between the repulsive force N and the amount of bristles of the tail brush 20, and a method for appropriately diagnosing the amount of bristles of the tail brush 20. I found As the amount of bristles of the tail brush 20 decreases, the water stopping performance of the tail brush 20 tends to decrease. When the amount of bristles of the tail brush 20 is reduced with respect to the reference amount of bristles, it becomes more necessary to consider replacement of the tail brush 20 in order to ensure the water stopping performance of the tail brush 20 more reliably. The reference hair amount may be, for example, the initial hair amount of the tail brush 20, or may be less than the initial hair amount. The reference repulsive force is set to a value that allows an appropriate judgment as to whether or not the repulsive force N is so small that the bristle amount of the tail brush 20 is reduced relative to the reference bristle amount. Note that the reference repulsive force can be appropriately changed according to the specifications (for example, material, size, shape) of the tail brush 20 and the like.

If the determination in step S105 is NO (that is, if it is determined that the repulsive force N is greater than or equal to the reference repulsive force), the process proceeds to step S106, and the operator confirms that the tail brush 20 has an appropriate amount of bristles (that is, , is equal to or greater than the reference hair amount), and the processing flow shown in FIG. 3 is terminated. In this case, the operator can determine that replacement of the tail brush 20 is unnecessary.

On the other hand, if it is determined YES in step S105 (that is, if it is determined that the repulsive force N is smaller than the reference repulsive force), the process proceeds to step S107, and the operator sets the hair amount of the tail brush 20 to the reference hair amount. 3, and the processing flow shown in FIG. 3 is terminated. In this case, the operator can determine that it is highly necessary to consider replacement of the tail brush 20 .

If it is determined NO in step S103 (that is, if it is determined that the coefficient of friction μ is greater than the first threshold value), the process proceeds to step S108, and the operator determines whether the coefficient of friction μ is equal to or less than the second threshold value. judge. The second threshold is greater than the first threshold.

The second threshold value is set to a value that can appropriately determine whether or not the coefficient of friction μ is large enough to cause foreign matter to adhere to the tail brush 20 . The foreign matter includes, for example, concrete flakes, water, earth and sand, or the backing material 22 and the like. Note that the second threshold can be appropriately changed according to the specifications (eg, material, size, shape) of the tail brush 20, the material of the segment S, or the like.

If the determination in step S108 is NO (that is, if the coefficient of friction μ is determined to be greater than the second threshold value), the process proceeds to step S109, and the operator diagnoses that the tail brush 20 is stuck with a foreign object. , the processing flow shown in FIG. 3 ends. If a foreign object adheres to the tail brush 20, the water stopping performance of the tail brush 20 is significantly degraded. Therefore, the operator can determine that there is a particularly high need to replace the tail brush 20 or that there is a particularly high need to consider replacing the tail brush 20 .

On the other hand, if the determination in step S108 is YES (that is, if it is determined that the coefficient of friction μ is equal to or less than the second threshold value), the process proceeds to step S110, and the operator confirms that the amount of grease on the tail brush 20 is insufficient. It is diagnosed that there is a foreign object in the tail brush 20 or that a foreign object is intruding.

Next, in step S<b>111 , the operator increases the amount of grease supplied to the tail brush 20 . Specifically, the operator increases the amount of grease delivered from the grease supply pump to increase the amount of grease discharged from the discharge ports 24 and 25 shown in FIG.

Next, in step S112, the operator recalculates the coefficient of friction μ. Specifically, the operator recalculates the coefficient of friction μ by performing the processes of steps S101 and S102.

Next, in step S113, the operator determines whether or not the coefficient of friction μ has decreased. Specifically, the operator determines whether or not the friction coefficient μ recalculated in step S112 is lower than the friction coefficient μ calculated before the grease supply amount is increased (step S111). do.

If it is determined YES in step S113 (that is, if it is determined that the coefficient of friction μ has decreased), the process returns to step S103. In this case, the operator can determine that the cause of the NO determination in step S103 immediately before is that the amount of grease on the tail brush 20 was insufficient. Therefore, increasing the amount of grease supplied to the tail brush 20 may bring the tail brush 20 into a normal state and result in a YES determination in the next step S103.

On the other hand, if NO is determined in step S113 (that is, if it is determined that the coefficient of friction μ has not decreased), the process proceeds to step S114, and the operator diagnoses that a foreign object has entered the tail brush 20. do.

Next, in step S115, the operator determines whether or not the repulsive force N is smaller than the reference repulsive force. Step S115 is the same as the process of step S105.

If NO is determined in step S115 (that is, if it is determined that the repulsive force N is greater than or equal to the reference repulsive force), the process proceeds to step S116, and the operator diagnoses that the amount of bristles on the tail brush 20 is appropriate. Then, the processing flow shown in FIG. 3 ends. In this case, although the amount of bristles on the tail brush 20 is appropriate, it is diagnosed that the tail brush 20 is invaded by foreign matter. Therefore, the operator can determine that there is a high need to replace the tail brush 20 or that there is a high need to consider replacing the tail brush 20 .

On the other hand, if it is determined YES in step S115 (that is, if it is determined that the repulsive force N is smaller than the reference repulsive force), the process proceeds to step S117, and the operator sets the bristle amount of the tail brush 20 to the reference bristle amount. 3, and the processing flow shown in FIG. 3 is terminated. In this case, it is diagnosed that a foreign object has entered the tail brush 20, and furthermore, it is diagnosed that the amount of bristles of the tail brush 20 is lower than the reference amount of bristles. Therefore, the operator determines that the need to replace the tail brush 20 or the need to consider replacing the tail brush 20 is even higher than when the amount of bristles of the tail brush 20 is appropriate (step S116). can do.

FIG. 4 is a flow chart showing a second example of the processing flow of the method for diagnosing the tail brush 20. As shown in FIG. The processing flow shown in FIG. 4 is repeated, for example, at preset time intervals. An example in which each process of the process flow shown in FIG. 4 is performed by the operator of the tunnel excavator 1 will be described below, but part or all of the processes of the process flow shown in FIG. It may be performed by the CPU.

In the processing flow shown in FIG. 4, steps S201 and S202 correspond to acquisition steps. In the processing flow shown in FIG. 4, step S203 corresponds to the calculation step. In the processing flow shown in FIG. 4, steps S204 to S215 correspond to diagnostic steps.

When the processing flow shown in FIG. 4 is started, the operator indirectly obtains the repulsive force N' of the tail brush 20 based on the size of the tail clearance C in step S201. Note that the size of the tail clearance C can be obtained using the tail clearance sensor 29 . For example, the smaller the tail clearance C, the greater the repulsive force N' of the tail brush 20 obtained by the operator. The repulsive force N′ obtained indirectly in this way is the repulsive force N′ assumed when the tail brush 20 is in a normal state, and the repulsive force N′ obtained directly in the processing flow shown in FIG. N can be different.

As described above, the repulsive force N' includes a component that changes according to the size of the tail clearance C and a component that changes according to the differential pressure across the tail brush 20 . Therefore, the operator can acquire the repulsive force N' more accurately by taking into account the differential pressure between the front and rear of the tail brush 20. FIG.

Next, in step S202, the operator indirectly calculates the sliding resistance F between the tail brush 20 and the segment S by subtracting components other than the sliding resistance F from the total thrust resistance of the excavator body 10. to get to. For example, the total thrust resistance Fn of the excavator main body 10 is represented by the following equation (1). Note that the total thrust resistance Fn can be obtained using information indicating the output of a device (for example, the shield jack 19 or the like) that advances the excavator body 10 . The following formula (1) is a formula based on the description on page 167 of JSCE, "Tunnel Standard Specifications 'Common Edition' and Commentary/'Shield Construction Method Edition' and Commentary Enacted in 2016" by the Japan Society of Civil Engineers.

Fn=F1+F2+F3+F4+F5 (1)

In Expression (1), F1 represents the frictional resistance or adhesion resistance between the outer peripheral surface of the excavator body 10 and the soil (soil of the ground G). F2 indicates the front face resistance. F3 indicates propulsion resistance due to a direction-changing load such as curve construction. F4 indicates the sliding resistance F between the tail brush 20 and the segment S; F5 indicates the traction resistance of the following bogie.

For example, the operator uses the formula (1) and subtracts F1, F2, F3 and F5, which are components other than the sliding resistance F between the tail brush 20 and the segment S, from Fn. Obtained as sliding resistance F. Note that F1, F2, F3, and F5 can be obtained by calculation using well-known theoretical formulas or by actual measurement using a sensor or the like.

Next, in step S203, the operator calculates the coefficient of friction μ between the tail brush 20 and the segment S based on the repulsive force N' and the sliding resistance F. Specifically, the operator divides the sliding resistance F by the repulsive force N' to calculate the coefficient of friction μ (μ=F/N').

Next, in step S204, the operator determines whether or not the coefficient of friction μ is equal to or less than the first threshold. Note that the first threshold in step S204 and the first threshold in step S103 in FIG. 3 may be the same or different.

If the determination in step S204 is YES (that is, if it is determined that the coefficient of friction μ is equal to or less than the first threshold value), basically it can be diagnosed that the tail brush 20 is in a normal state. However, as will be described later, the tail brush 20 may be worn out (that is, the amount of bristles of the tail brush 20 is reduced relative to the reference amount of bristles). Therefore, if the determination in step S204 is YES, the process proceeds to step S205, and the operator diagnoses that the tail brush 20 is in a normal state or that the tail brush 20 is worn out.

If the determination in step S204 is NO (that is, if the coefficient of friction μ is greater than the first threshold value), the tail brush 20 is diagnosed as being in an abnormal state, as will be described later. . For example, as in step S210, it is diagnosed that the tail brush 20 is stuck with foreign matter, or as in step S211, the amount of grease on the tail brush 20 is insufficient, or there is foreign matter on the tail brush 20. Diagnosed as invading.

After step S205, in step S206, the operator determines whether or not the coefficient of friction μ is smaller than the third threshold. The third threshold is less than the first threshold.

In the second example shown in FIG. 4, when the coefficient of friction μ is less than or equal to the first threshold value, when the coefficient of friction μ is excessively small, the amount of bristles of the tail brush 20 is less than the reference amount of bristles. Otherwise, it is diagnosed that the tail brush 20 has an appropriate amount of bristles (that is, is equal to or greater than the reference amount of bristles). The reference hair amount may be, for example, the initial hair amount of the tail brush 20, or may be less than the initial hair amount, as in step S105 in FIG. The third threshold value is set to a value that can appropriately determine whether or not the coefficient of friction μ is small enough to reduce the amount of bristles of the tail brush 20 relative to the reference amount of bristles. Note that the third threshold value can be appropriately changed according to the specifications (for example, material, size, shape) of the tail brush 20 and the like.

If NO is determined in step S206 (that is, if it is determined that the coefficient of friction μ is equal to or greater than the third threshold value), the process proceeds to step S207, and the operator diagnoses that the amount of bristles on the tail brush 20 is appropriate. Then, the processing flow shown in FIG. 4 ends. In this case, the operator can determine that replacement of the tail brush 20 is unnecessary.

On the other hand, if it is determined YES in step S206 (that is, if it is determined that the coefficient of friction μ is smaller than the third threshold), the process proceeds to step S208, and the operator sets the hair amount of the tail brush 20 to the reference hair amount. 4, and the process flow shown in FIG. 4 is terminated. In this case, the operator can determine that it is highly necessary to consider replacement of the tail brush 20 .

If it is determined NO in step S204 (that is, if it is determined that the coefficient of friction μ is greater than the first threshold value), the process proceeds to step S209, and the operator determines whether the coefficient of friction μ is equal to or less than the second threshold value. judge. The second threshold is greater than the first threshold. The second threshold in step S209 and the second threshold in step S108 in FIG. 3 may be the same or different.

If the determination in step S209 is NO (that is, if the coefficient of friction μ is determined to be greater than the second threshold value), the process proceeds to step S210, and the operator diagnoses that the tail brush 20 is stuck with a foreign object. , the processing flow shown in FIG. 4 ends. If a foreign object adheres to the tail brush 20, the water stopping performance of the tail brush 20 is significantly degraded. Therefore, the operator can determine that there is a particularly high need to replace the tail brush 20 or that there is a particularly high need to consider replacing the tail brush 20 .

On the other hand, if it is determined YES in step S209 (that is, if it is determined that the coefficient of friction μ is equal to or less than the second threshold value), the process proceeds to step S211, and the operator confirms that the amount of grease on the tail brush 20 is insufficient. It is diagnosed that there is a foreign object in the tail brush 20 or that a foreign object is intruding.

Next, in step S<b>212 , the operator increases the amount of grease supplied to the tail brush 20 . Specifically, the operator increases the amount of grease delivered from the grease supply pump to increase the amount of grease discharged from the discharge ports 24 and 25 shown in FIG.

Next, in step S213, the operator recalculates the coefficient of friction μ. Specifically, the operator recalculates the friction coefficient μ by performing the processes of steps S201 to S203.

Next, in step S214, the operator determines whether or not the coefficient of friction μ has decreased. Specifically, the operator determines whether or not the friction coefficient μ recalculated in step S213 is lower than the friction coefficient μ calculated before the grease supply amount is increased (step S212). do.

If it is determined YES in step S214 (that is, if it is determined that the coefficient of friction μ has decreased), the process returns to step S204. In this case, the operator can determine that the cause of the NO determination in step S204 immediately before is that the amount of grease on the tail brush 20 was insufficient. Therefore, increasing the amount of grease supplied to the tail brush 20 may bring the tail brush 20 into a normal state and result in a YES determination in the next step S204.

On the other hand, if NO is determined in step S214 (that is, if it is determined that the coefficient of friction μ has not decreased), the process proceeds to step S215, and the operator diagnoses that a foreign object has entered the tail brush 20. Then, the processing flow shown in FIG. 4 ends. In this case, the operator can determine that there is a high need to replace the tail brush 20 or that there is a high need to consider replacing the tail brush 20 .

The first example of the processing flow of the diagnostic method for the tail brush 20 has been described above with reference to FIG. 3, and the second example of the processing flow of the diagnostic method for the tail brush 20 has been described with reference to FIG. . However, the processing flow of the diagnostic method for the tail brush 20 is not particularly limited to the example described above. For example, part of the processing may be added, deleted, or changed with respect to the first example or second example described above. For example, after step S215 in the second example, steps S206 to S208 may be additionally performed.

Moreover, in the above, the first example in which the repulsive force N and the sliding resistance F are obtained directly using sensors, and the second example in which the repulsive force N' and the sliding resistance F are obtained indirectly explained each. However, as a method of acquiring the repulsive force N and the sliding resistance F, only direct acquisition may be used as in the first example. In this case, the tail clearance sensor 29 can be omitted from the construction of the tunnel excavator 1 . Alternatively, only indirect acquisition may be used, as in the second example. In this case the force sensor 28 may be omitted from the configuration of the segment S or tunnel excavator 1 . Moreover, both direct acquisition and indirect acquisition may be used properly, and both direct acquisition and indirect acquisition may be used together. In direct acquisition, the repulsive force N and the sliding resistance F at the installation position of the sensor can be acquired with high accuracy. This makes it possible to grasp the state of the tail brush 20 at the installation position of the sensor. The installation positions of the sensors such as the force sensor 28 include, for example, a plurality of positions spaced from each other in the circumferential direction, or a plurality of positions corresponding to each row of the tail brush 20 . Also, the amount of grease ejected from the ejection port 24 and the amount of grease ejected from the ejection port 25 may differ based on the difference in the state of the tail brush 20 at each installation position of the sensor. This enables efficient use of grease. On the other hand, in indirect acquisition, the average repulsive force N' and sliding resistance F of the entire device can be acquired. For example, by indirect acquisition, after grasping the tendency of the repulsive force N' and sliding resistance F in the entire device, if you want to acquire the repulsive force N and sliding resistance F at a specific position with high accuracy, directly It is conceivable to use In addition, it is also possible to switch to indirect acquisition as appropriate when a sensor used for direct acquisition fails.

Also, in the above description, in step S206 of the second example, an example is described in which whether or not the amount of bristles of the tail brush 20 has decreased with respect to the reference amount of bristles is diagnosed based on the coefficient of friction μ. However, in the case where the repulsive force N′ and the sliding resistance F are obtained indirectly as in the second example, whether or not the hair amount of the tail brush 20 has decreased with respect to the reference hair amount is determined by sliding. Diagnosis may be made based on the resistance F. For example, when the sliding resistance F is smaller than the reference sliding resistance, the operator may diagnose that the bristle amount of the tail brush 20 is lower than the reference bristle amount. The reference sliding resistance is a value obtained by multiplying the repulsive force N' by the third threshold in step S206.

Further, in the above description, examples of cases where the tail brush 20 is in an abnormal state include cases where a foreign object is adhered to the tail brush 20, where the amount of grease on the tail brush 20 is insufficient, or where the tail brush 20 is the case where a foreign substance has entered. However, when the tail brush 20 is in an abnormal state, cases other than the above may also be included. For example, when the tail brush 20 is in an abnormal state, when the tail brush 20 is inverted (that is, when the tip of the tail brush 20 is positioned forward of the base), or , the injection pressure of the backing material 22 is abnormally high, and the tail brush 20 is pressed against the segment S with an abnormally high force. Therefore, when diagnosing that the tail brush 20 is in an abnormal state, the operator may, for example, diagnose that the tail brush 20 is inverted, and the tail brush 20 is abnormally high relative to the segment S. It may be diagnosed as being pressed by force.

The effect of the method for diagnosing the tail brush 20 according to the embodiment of the present invention will be described below.

The diagnostic method for the tail brush 20 according to the present embodiment includes an obtaining step of obtaining the repulsive force N of the tail brush 20 acting on the outer periphery of the segment S and the sliding resistance F between the tail brush 20 and the segment S. , a calculating step of calculating the coefficient of friction μ between the tail brush 20 and the segment S based on the repulsive force N and the sliding resistance F obtained in the obtaining step; and a diagnostic step of diagnosing the condition of the tail brush 20 . Accordingly, the state of the tail brush 20 can be properly diagnosed based on the relationship between the coefficient of friction μ and the state of the tail brush 20 . Therefore, for example, it is possible to appropriately take countermeasures according to factors that reduce the water stopping performance of the tail brush 20 . Therefore, safe tunnel construction can be realized.

Further, in the diagnosis step of the diagnosis method for the tail brush 20 according to the present embodiment, if the coefficient of friction μ is equal to or less than the first threshold value, the tail brush 20 does not allow water, earth and sand, or the backfill material 22 to enter the excavator body 10 . If the coefficient of friction μ is greater than the first threshold value, it is preferably diagnosed that the tail brush 20 is in an abnormal state that is not in a normal state. Accordingly, whether or not the tail brush 20 is in a normal state can be properly diagnosed based on the relationship between the coefficient of friction μ and the state of the tail brush 20 .

Further, in the diagnostic step of the diagnostic method for the tail brush 20 according to the present embodiment, when the coefficient of friction μ is greater than the first threshold and the coefficient of friction μ is equal to or smaller than the second threshold larger than the first threshold, the tail It is preferable to diagnose that the amount of grease in the brush 20 is insufficient, or that foreign matter has entered the tail brush 20 . As a result, whether or not the amount of grease in the tail brush 20 is insufficient or whether or not foreign matter has entered the tail brush 20 is properly diagnosed based on the relationship between the coefficient of friction μ and the state of the tail brush 20. be able to.

Further, in the diagnostic step of the diagnostic method for the tail brush 20 according to the present embodiment, when the coefficient of friction μ is equal to or less than the second threshold among the cases where the coefficient of friction μ is greater than the first threshold, grease is not supplied to the tail brush 20. If the coefficient of friction μ does not decrease even though the amount of grease supplied to the tail brush 20 has been increased, it is preferable to diagnose that foreign matter has entered the tail brush 20 . As a result, when the coefficient of friction μ is greater than the first threshold value and equal to or less than the second threshold value, it is possible to appropriately determine whether the amount of grease on the tail brush 20 is insufficient or foreign matter has entered the tail brush 20. can be diagnosed.

Further, in the diagnostic step of the diagnostic method for the tail brush 20 according to the present embodiment, when the coefficient of friction μ is greater than the first threshold and is greater than the second threshold, the tail brush It is preferable to diagnose that a foreign object is stuck to 20 . Accordingly, it is possible to appropriately diagnose whether or not foreign matter is stuck to the tail brush 20 based on the relationship between the coefficient of friction μ and the state of the tail brush 20 .

Further, in the diagnostic step of the diagnostic method for the tail brush 20 according to the present embodiment, the bristle amount of the tail brush 20 is compared with the reference bristle amount based on at least one of the repulsive force N, the sliding resistance F, and the friction coefficient μ. It is preferable to diagnose whether the Thereby, it is possible to appropriately diagnose whether or not the amount of bristles of the tail brush 20 is reduced with respect to the reference amount of bristles.

Further, in the acquisition step of the diagnostic method for the tail brush 20 according to the present embodiment, the repulsive force N' is preferably obtained indirectly. Thereby, the repulsive force N' can be obtained without using a sensor capable of directly obtaining the repulsive force N (for example, the force sensor 28 or the like). Therefore, the number of sensors of the tunnel excavator 1 can be reduced.

Further, in the acquisition step of the diagnostic method for the tail brush 20 according to the present embodiment, the sliding resistance F is indirectly acquired by subtracting the components other than the sliding resistance F from the total thrust resistance of the excavator main body 10. is preferred. Thereby, the sliding resistance F can be obtained without using a sensor capable of directly obtaining the sliding resistance F (for example, the force sensor 28 or the like). Therefore, the number of sensors of the tunnel excavator 1 can be reduced.

Further, in the acquisition step of the diagnostic method for the tail brush 20 according to the present embodiment, it is preferable to directly acquire the repulsive force N based on the detection result of the repulsive force detection section (for example, the force sensor 28). Thereby, the repulsive force N can be obtained with high accuracy.

Further, in the acquisition step of the diagnostic method for the tail brush 20 according to the present embodiment, it is preferable to directly acquire the sliding resistance F based on the detection result of the sliding resistance detection section (for example, the force sensor 28). . Thereby, the sliding resistance F can be obtained with high accuracy.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is of course not limited to the above-described embodiments, and various modifications within the scope of the claims can be made. It goes without saying that modifications also fall within the technical scope of the present invention.

For example, although the tunnel excavator 1 of the earth pressure type (including the mud pressure type) has been described above, the tunnel excavator according to the present invention may be of the mud type.

Further, for example, in the above description, each component of the tunnel excavator 1 has been described with reference to the drawings, but the dimensions and positional relationships of each component in the drawings are merely examples. The dimensions and positional relationships of the components are not limited to the examples shown in the drawings.

INDUSTRIAL APPLICABILITY The present invention can be used for a method of diagnosing a tail brush.

1 Tunnel Excavator 10 Excavator Main Body 11 Cutter Head 12 Cutter Center Axis 13 Partition Wall 14 Rotating Ring 15 Connection Beam 16 Cutter Rotation Motor 17 Chamber 18 Screw Conveyor 19 Shield Jacks 20, 20A, 20B, 20C Tail Brush 21 Gap 22 Backing Material 23A, 23B Grease supply path 24 Discharge port 25 Discharge port 26 Space 27 Space 28 Force sensor (repulsive force detector, sliding resistance detector)
29 Tail clearance sensor C Tail clearance F Sliding resistance G Ground N, N' Repulsive force S Segment T Tunnel μ Friction coefficient

Claims (10)

A method for diagnosing a tail brush provided between the inner periphery of the rear end of the excavator body and the outer periphery of a segment in a tunnel excavator having a cylindrical excavator body having a cutter head attached to the front end thereof, comprising: ,
an acquiring step of acquiring the repulsive force of the tail brush acting on the outer periphery of the segment and the sliding resistance between the tail brush and the segment;
a calculating step of calculating a coefficient of friction between the tail brush and the segment based on the repulsive force and the sliding resistance obtained in the obtaining step;
a diagnosis step of diagnosing the state of the tail brush based on the coefficient of friction calculated in the calculation step;
including,
How to diagnose tail brush. In the diagnostic step,
when the coefficient of friction is equal to or less than a first threshold, diagnosing that the tail brush is in a normal state capable of preventing water, sand, or backfill material from entering the body of the excavator;
diagnosing that the tail brush is in an abnormal state that is not in the normal state when the coefficient of friction is greater than the first threshold;
The method for diagnosing a tail brush according to claim 1. In the diagnosing step, when the coefficient of friction is greater than the first threshold and the coefficient of friction is equal to or less than a second threshold larger than the first threshold, the amount of grease on the tail brush is insufficient. Alternatively, diagnosing that a foreign object has entered the tail brush,
The method for diagnosing a tail brush according to claim 2. In the diagnostic step,
increasing the amount of grease supplied to the tail brush when the coefficient of friction is equal to or less than the second threshold among the cases where the coefficient of friction is greater than the first threshold;
If the coefficient of friction does not decrease despite increasing the amount of grease supplied to the tail brush, it is diagnosed that foreign matter has entered the tail brush.
The method for diagnosing a tail brush according to claim 3. In the diagnosing step, when the coefficient of friction is greater than the first threshold and the coefficient of friction is greater than a second threshold which is larger than the first threshold, it is diagnosed that a foreign object is stuck to the tail brush. ,
The method for diagnosing a tail brush according to any one of claims 2 to 4. In the diagnosis step, based on at least one of the repulsive force, the sliding resistance, and the friction coefficient, it is diagnosed whether or not the amount of bristles of the tail brush is reduced relative to a reference amount of bristles.
A method for diagnosing a tail brush according to any one of claims 1 to 5. In the acquiring step, the repulsive force is indirectly acquired based on the size of the tail clearance between the inner circumference of the rear end portion of the excavator body and the outer circumference of the segment.
A method for diagnosing a tail brush according to any one of claims 1 to 6. In the acquiring step, the sliding resistance is indirectly acquired by subtracting components other than the sliding resistance from the total thrust resistance of the excavator body.
A method for diagnosing a tail brush according to any one of claims 1 to 7. The segment or the tunnel excavator is provided with a repulsive force detection unit that detects the repulsive force,
In the acquiring step, the repulsive force is directly acquired based on the detection result of the repulsive force detection unit.
A method for diagnosing a tail brush according to any one of claims 1 to 8. The segment or the tunnel excavator is provided with a sliding resistance detection unit that detects the sliding resistance,
In the acquisition step, the sliding resistance is directly acquired based on the detection result of the sliding resistance detection unit.
A method for diagnosing a tail brush according to any one of claims 1 to 9.

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