JP2015140623A - Inspection method for cutter disc of shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To curtail an excavation period by a shield method.SOLUTION: After forming an excavated hole EH in a ground GD by a shield machine 1, a cutter head 2 stops rotation and recedes to form an inspection space S between the cutter head 2 and a pit face. Then, after discharging a part of mud in a chamber 4 of the shield machine 1, clear water is poured into the inspection space S and a vacant area formed above the chamber 4 after discharging the mud. Furthermore, an inspection piece P is inserted into the clear water inside the inspection space S from inside a machine body 3, for inspecting the conditions of a drill bit 2f and others of the cutter head 2. This eliminates the need to erect a vertical shaft or to improve the ground when inspecting the cutter head 2, thereby curtailing the excavation period by a shield method.

Description

  The present invention relates to a method for inspecting a cutter board of a shield machine.

  The shield construction method excavates natural ground by pushing the cutter machine of the shield machine against the face and rotating it while stabilizing the face, and assembles a tunnel by assembling multiple steel segments on the inner wall of the excavation mine. This is a construction method.

  In order to inspect the state of the bit of the cutter board of the shield machine, build a shaft on the front surface (face) of the cutter board, or improve the ground of the face, and then the operator moves from the shield machine to the face. Check the state of the bit of the cutter board.

  For example, Patent Document 1 discloses a configuration of a mud pressure type shield excavator that performs excavation in a state where mud pressure due to mud filled in a chamber between a cutter head and an apparatus main body is opposed to earth pressure of a face. It is disclosed. Further, for example, Patent Document 2 discloses a configuration in which the earth pressure gauge equipped in the shield machine can be replaced and adjusted from the inside of the machine.

JP 2002-303092 A Japanese Utility Model Publication No.2-132797

  However, when inspecting the state of the bits of the cutter board constituting the shield machine, if the construction of the vertical shaft or the improvement of the ground is carried out, there is a problem that the excavation period by the shield construction method becomes long.

  The present invention has been made from the above-described technical background, and an object of the present invention is to provide a technique capable of shortening the excavation work period by the shield method.

  In order to solve the above-mentioned problem, the inspection method for the cutter machine of the shield machine according to the present invention according to claim 1 is characterized in that the mud pressure due to the mud filled in the chamber between the cutter machine of the shield machine and the device body is applied. A step of forming an excavation pit in the ground by rotating the cutter board in a state of being opposed to the pressure of the face; and after stopping the rotation of the cutter board, the shield machine is moved backward to retract the cutter board and the A step of forming an inspection space between the face and the inspection space; and after the formation of the inspection space, the mud soil in the chamber is discharged in a state where the rotation of the cutter board is stopped. A water replacement step of filling water into an empty area formed in the interior, and after the water replacement step, an inspection photographing means is inserted into the inspection space from the inside of the device body to photograph the image of the cutter board Characterized in that it and a step of inspecting the state of the cutter plate by Rukoto.

  Further, according to the present invention of claim 2, in the invention of claim 1, in the water replacement step, the mud in the chamber is discharged in a plurality of times, and the chamber is discharged each time the water is discharged. Water is poured into an empty area in the inspection space.

  Further, the present invention according to claim 3 is the invention according to claim 1 or 2, wherein a flocculant is added to the water in the empty area after the water replacement step and before the cutter board inspection step. It has the process.

  According to the first aspect of the present invention, since it is not necessary to construct a shaft or improve the ground when inspecting the cutter board, the excavation work period by the shield method can be shortened.

  According to invention of Claim 2, since the stability of a ground can be improved at the time of a water substitution process, it becomes possible to improve the safety | security of a shield construction method.

  According to the invention described in claim 3, since the transparency of the replacement water can be improved in a short time compared to the case where no flocculant is used, the excavation work period by the shield method can be shortened.

It is the principal part block diagram which looked through the inside of the mud pressure shield machine which concerns on one embodiment of this invention from the side. It is a front view of the cutter head of the shield machine of FIG. It is the principal part block diagram which showed the inside of the shield machine of FIG. 1 at the time of the test | inspection of the cutter head in a digging hole through the side. It is a flowchart of an example of the shield construction method which concerns on one embodiment of this invention. (A) is the schematic which looked at the principal part of the shield machine during the excavation process from the side, (b) the principal part of the shield machine during the excavation process following FIG. 5 (a) was seen from the side. FIG. (A) is the schematic which looked at the principal part of the shield machine during the excavation process following FIG.5 (b) from the side, (b) is the principal of the shield machine during the excavation process following FIG.6 (a). It is the schematic which looked at the part from the side. It is a front view of the cutter head which shows the water replacement position of the step of FIG.6 (b). (A) is the schematic which looked at the principal part of the shield machine during the excavation process following FIG.6 (b) from the side, (b) is the principal of the shield machine during the excavation process following FIG.8 (a). It is the schematic which looked at the part from the side. It is a front view of the cutter head which shows the water replacement position of the step of FIG.8 (b). (A) is the schematic which looked at the principal part of the shield machine during the excavation process following FIG.8 (b) from the side, (b) is the principal of the shield machine during the excavation process following FIG.10 (a). It is the schematic which looked at the part from the side. It is a front view of the cutter head which shows the water replacement position of the step of FIG.10 (b). (A) is the schematic which looked at the principal part of the shield machine during the excavation process following FIG.10 (b) from the side, (b) is the principal of the shield machine during the excavation process following FIG.12 (a). It is the schematic which looked at the part from the side. It is the principal part block diagram which looked at the inside of the shield machine which concerns on other embodiment of this invention through the side. It is a front view of an example of the cutter head which comprises the shield machine of FIG.

  Hereinafter, an embodiment as an example of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.

  First, an example of the shield machine according to the present embodiment will be described with reference to FIGS. FIG. 1 is a main part configuration diagram showing the inside of the shield machine of the present embodiment as seen through the side, FIG. 2 is a front view of a cutter head of the shield machine of FIG. 1, and FIG. 3 is a cutter in a drill hole. It is the principal part block diagram which showed the inside of the shield machine of FIG. 1 at the time of the test | inspection of a head through the side.

  The shield machine 1 according to the present embodiment generates a mud pressure by, for example, digging in a state where the chamber 4 between the cutter head 2 and the device body 3 is filled with mud, and the mud pressure is It is a mud pressure shield excavator that excavates in a state that counteracts earth pressure. In this case, the mud in the chamber 4 is generated by injecting an additive into the earth and sand excavated by the cutter head 2 and kneading, and is impermeable and plastic fluidity (property that can be freely deformed and moved). And have.

  The operation of the shield machine 1 is controlled by an operator in a cab in a subsequent carriage (not shown) behind the shield machine 1. Moreover, the whole operation | movement of the shield machine 1 is controlled by the control part provided in the cab. The tunnel constructed by the shield machine 1 is not particularly limited, and is, for example, a tunnel such as a tap water tunnel, a sewage tunnel, or a cable tunnel.

  On the front surface of the device main body 3 of the shield machine 1, for example, a spoke-shaped disc-shaped cutter head 2 is installed in a state in which the spoke-shaped cutter head 2 can rotate in the forward and reverse directions along the circumferential direction of the device main body 3. The cutter head 2 is a member for excavating the face of the ground. As shown in FIG. 2, the cutter head 2 has a central hub portion 2a on the front surface (a surface facing the face) and an outer periphery from the hub portion 2a. Three spoke portions 2b extending radially inward, an outer peripheral ring portion 2c connecting the tip portions of the spoke portions 2b, and a through hole 2d formed between these members are installed.

  A center bit 2e is installed on the front surface of the hub portion 2a. Each spoke 2b is provided with a plurality of bits 2f and a scraper tooth 2g. A bit (not shown) and a copy cutter 2h are installed on the outer ring part 2c. The bit of the outer peripheral ring portion 2c has a role of cutting obstacles. Further, the copy cutter 2h has a role of performing excavation at the time of sharp curve construction, attitude control of the shield machine 1 and the like.

  Further, a mixing blade 6 is installed on the back surface of the cutter head 2. The kneading blade 6 is formed, for example, in a cylindrical shape, and has a role of stirring and mixing the earth and sand in the chamber 4 and the additive when the cutter head 2 rotates.

  On the other hand, the apparatus main body 3 constituting the shield machine 1 includes a front body plate (front body part) 3a, a rear body plate (rear body part) 3b behind the front body plate (front body part) 3b, and a tail seal 3c behind the body. .

  The front trunk plate 3a and the rear trunk plate 3b are formed of, for example, a cylindrical steel plate, and are components that form the outer shape of the device main body 3 and form a hollow space inside the device main body 3. The front body plate 3a and the rear body plate 3b are engaged with each other when the spherical bearing portion at the tip of the rear body plate 3b is in contact with the inner peripheral surface of the front body plate 3a on the rear end side of the front body plate 3a. Has been.

  The tail seal 3c is a sealing member that prevents groundwater and the like from entering the apparatus main body 3 from the rear part of the apparatus main body 3 during excavation work, and the inner periphery of the rear cylinder plate 3b at the rear end of the rear cylinder plate 3b. It is installed in a frame shape along.

  On the front side of the front body plate 3a, a partition wall 7 that divides the hollow space in the device main body 3 into the face side and the machine interior is installed at a position retracted inward of the device main body 3 from the front surface. The chamber 4 is provided on the face side of the partition wall 7, that is, between the cutter head 2 and the partition wall 7. The earth and sand excavated by the cutter head 2 are taken into the chamber 4 through the through-hole 2d (see FIG. 2) of the cutter head 2.

  In addition, a communication hole 7 a for communicating the device main body 3 and the chamber 4 is formed in the upper part of the partition wall 7 in the plane. The communication hole 7a supplies fresh water, injects an additive (mud clay material), inserts a cleaning member (not shown) into the chamber 4 from the apparatus main body 3 or an inspection member (inspection). This is a hole for inserting a photographing means P (see FIG. 3).

  For example, bentonite is used as the additive, but a bubble material may be used instead of bentonite, or both a bentonite and a bubble material may be used. The cleaning member is a member for cleaning the cutter head 2 (hub portion 2a, spoke portion 2b, outer ring portion 2c, center bit 2e, bit 2f, etc.).

  The inspection member P is an imaging means for inspecting the state of the cutter head 2 by imaging the cutter head 2 (hub portion 2a, spoke portion 2b, outer ring portion 2c, center bit 2e, bit 2f, etc.) As shown in FIG. 3, a rod part P1, a camera part P2 at the tip thereof, and a wire (not shown) are provided.

  For example, a camera with a waterproof and waterproof structure is used for the camera part P2, and the position can be changed up and down by operating a wire in the device main body 3 (see arrow A1 in FIG. 3). When the cutter head 2 is inspected, an inspection space S is formed between the front surface of the cutter head 2 and the face in the excavation mine EH excavated in the ground GD. The camera part P2 of the inspection member P is installed in the inspection space S through the communication hole 7a of the partition wall 7 and the through hole 2d of the cutter head 2. An image photographed by the camera part P2 of the inspection member P is transmitted in real time to the operator side at the rear of the machine and can be visually confirmed.

  In the shield machine 1, a cutter driving body 8, a bent jack 9 a, a shield jack 9 b, a screw conveyor 10, an erector 11, an additive injection part 12 a, and the like are installed on the inner side of the partition wall 7.

  The cutter driver 8 is a motor (drive source) that rotates the cutter head 2 in the forward and reverse directions. Here, the center shaft drive system is illustrated as a cutter drive system.

  The bent jack 9a is a device that connects the front body plate 3a and the rear body plate 3b and corrects the propulsion direction and posture of the shield machine 1. A plurality of middle-folded jacks 9a are arranged side by side along the circumferential direction of the device body 3 so as to straddle the boundary between the front body plate 3a and the rear body plate 3b in the device body 3. By supplying pressure oil to the bent jack 9a and propelling the shield machine 1 in a state where the front body plate 3a and the rear body plate 3b are refracted in a predetermined direction and angle, the shield machine 1 The propulsion direction and attitude can be controlled.

  The shield jack 9b is a device that generates a propulsive force for advancing the shield machine 1 by applying a reaction force to the segment SG installed behind the device body 3. A plurality of shield jacks 9b are arranged side by side along the circumferential direction of the equipment body 3 so as to straddle the boundary between the front body plate 3a and the back body plate 3b in the equipment body 3.

  The screw conveyor 10 is a device for discharging the earth and sand taken into the chamber 4 to the outside of the machine, and passes through the partition wall 7 at the bottom of the device body 3 from the earth and sand taking-in end portion 10 a disposed in the chamber 4. It is provided in a state of continuously extending obliquely upward toward the discharge end portion 10b disposed at a position slightly higher than the center in the height direction of the device body 3 at the rear of the device body 3. Here, a ribbon screw conveyor is illustrated.

  The erector 11 is an assembly device that holds the segment SG, turns in the inner circumferential direction of the excavation mine, and transfers it to an assembly position in the inner circumferential direction of the excavation mine. The erector 11 is installed in the hollow of the rear trunk plate 3b so as to be rotatable along the circumferential direction of the excavation mine by a hydraulic motor (not shown) for driving the erector.

  The additive injection part 12a is a part for injecting the additive (mud clay material) to the outer periphery and the face of the shield machine 1. This additive injection part 12a is arrange | positioned in multiple places along the circumferential direction of the front trunk | drum plate 3a.

  Next, an example of the shield method of the present embodiment will be described with reference to FIGS. 5 to 12 along the flowchart of FIG. 5, 6, 8, 10, and 12 are schematic views of the main part of the shield machine during the excavation process as viewed from the side, and FIGS. 7, 9, and 11 are water replacements at each stage. It is a front view of the cutter head which shows a position.

  FIG. 5A shows the shield machine 1 during excavation of the excavation mine EH in the ground GD. A plurality of segments SG are assembled behind the excavation mine EH excavated in the ground GD by the shield machine 1. Further, the backfill material BG is injected between the segment SG and the excavation mine EH.

  First, as shown in FIG. 5B, the mud MD is injected into the chamber 4 to generate mud pressure, and the mud pressure is opposed to the earth pressure of the face to stabilize the face, and the shield machine 1 The cutter head 2 is pressed against the face and rotated to excavate the ground GD, and the shield jack 9b of the shield machine 1 is extended to advance the shield machine 1 as indicated by the arrow A2. In order to make the drawing easy to see, the mud MD is hatched.

  Subsequently, after the cutter head 2 stops rotating, as shown in FIG. 6A, the shield jack 9b is contracted to slightly retract the shield machine 1 as indicated by an arrow A3. Thereby, the inspection space S is formed between the cutter head 2 and the face. The retracted length is, for example, about 22 mm (machine buckling process 100 in FIG. 4).

  Thereafter, while the rotation of the cutter head 2 is stopped, as shown in FIG. 6B, a part of the mud MD in the chamber 4 is taken in by the screw conveyor 10 in the lower part of the chamber 4 as indicated by an arrow A4. Through the end 10a (see FIG. 1 to FIG. 3), it is discharged to the outside, and a free space formed in the upper part of the chamber 4 and the inspection space S due to the earthing is formed in the communication hole in the upper part of the partition wall 7 as indicated by an arrow A5. Fresh water W is injected through 7a (see FIGS. 1 to 3). Thereby, the mud MD is replaced with fresh water W. In FIG. 6B, different water hatching is applied to the fresh water W and the mud MD to make the drawing easier to see (chamber water replacement step 101 in FIG. 4).

  In this earth discharge, an additive (bentonite + polymer material or the like) is injected into the screw conveyor 10 from the earth and sand intake end 10a side, and the additive and mud are stirred in the screw conveyor 10. As a result, the water stoppage can be improved, so that it is possible to prevent a decrease in earth pressure due to soil removal.

  In addition, in the water replacement work, if the diameter of the excavation mine EH is large or depending on the conditions of the ground, if the replacement is performed to the center height position of the cutter head 2 at once, the ground may become unstable. Therefore, the replacement is performed in multiple times while confirming that the ground is independent. Thereby, since the stability of the ground can be improved during the water replacement step, the safety of excavation work can be improved.

  Here, as shown in FIGS. 6B and 7, the soil is discharged from the upper part of the outer periphery of the cutter head 2 to the middle position in the longitudinal direction of the spoke portion 2 b (the radial direction of the cutter head 2) to perform water replacement. A broken line in FIG. 7 indicates a boundary position L1 between the fresh water W and the mud MD. In the water replacement operation, fresh water W is supplied while discharging the soil while maintaining the earth pressure so as not to cause ground subsidence, while the subsidence survey is performed on the ground. Here, the case where fresh water is injected into the inspection space S from the apparatus main body 3 has been described. However, the present invention is not limited to this, and underground water in the ground may enter the inspection space S.

  Next, while the rotation of the cutter head 2 is stopped, the flocculant is added to the inside of the chamber 4 and the fresh water W in the inspection space S through the communication hole 7a at the upper part of the partition wall 7, and then the flocculant is washed with a washing nozzle (reverse injection nozzle: Agitation effect is obtained by agitation (not shown). Thereby, the suspended | floating matter in substitution water can be removed in a short time compared with the case where a flocculant is not used. That is, the transparency of the replacement water can be improved in a short time. Therefore, the excavation work period by the shield method can be shortened (flocculating agent addition step 102 in FIG. 4).

  Subsequently, with the rotation of the cutter head 2 stopped, the inspection member P is inserted into the fresh water W in the inspection space S through the communication hole 7a of the partition wall 7 as shown in FIG. The head 2 (spoke part 2b, outer ring part 2c, bit 2f, scraper tooth 2g, etc.) is photographed by the camera part P2. The operator inspects the state of the cutter head 2 by visually observing an image photographed by the camera unit P2 inside the apparatus main body 3. In this inspection step, not only the cutter head 2 but also the ground GD face such as the gravel diameter may be confirmed (camera inspection step 103 in FIG. 4).

  Thus, in this Embodiment, since the state of the cutter head 2 can be test | inspected within the apparatus main body 3 of the shield machine 1, it is not necessary to construct a shaft or to improve the ground. Therefore, the excavation work period by the shield method can be shortened.

  In addition, since large-scale equipment for the construction of shafts and ground improvement is unnecessary, the construction cost for excavation work by the shield method can be reduced.

  In addition, since the state of the cutter head 2 can be inspected in the main body 3 of the shield machine 1, excavation can be performed without any problem even in the city center where buried objects and private houses are densely packed or road use permission is required. Work can be done.

  Furthermore, since it is not necessary to go to the face when the cutter head 2 is inspected, the safety of excavation work can be improved.

  Subsequently, when mud is firmly attached to the cutter head 2 (spoke part 2b, outer ring part 2c, bit 2f, scraper tooth 2g, etc.), the cleaning rod (cleaning member) is kept while the cutter head 2 is kept rotating. : Not shown) is inserted into the inspection space S through the communication hole 7a of the partition wall 7, and the dirt on the cutter head 2 (spoke part 2b, outer ring part 2c, bit 2f, scraper tooth 2g, etc.) in the fresh water W is high-pressured. Cleaning is performed by spraying or the like (spoke upper cleaning step 104 in FIG. 4).

  Thereafter, with the rotation of the cutter head 2 stopped, the inspection member P is inserted into the fresh water W of the inspection space S through the communication hole 7a of the partition wall 7 as shown in FIG. The part 2b, the outer ring part 2c, the bit 2f, the scraper tooth 2g, etc.) are photographed by the camera part P2. The operator inspects the state of the cutter head 2 by visually observing an image taken by the camera unit P2 inside the apparatus main body 3. In this inspection process, not only the state of the cutter head 2 but also the state of the face of the ground GD such as the gravel diameter may be inspected (camera inspection step 105 in FIG. 4).

  Next, while the rotation of the cutter head 2 is stopped, a part of the mud MD in the chamber 4 is discharged to the outside by the screw conveyor 10 as shown by an arrow A6 as shown in FIG. As shown by an arrow A7, fresh water W is injected into the empty area generated in the chamber 4 and the upper part of the inspection space S by the soil through the communication hole 7a in the upper part of the partition wall 7. Thereby, the mud MD is replaced with fresh water W.

  The way of soil removal and water replacement work is the same as in the above-described step 101, but here, as shown in FIGS. 8B and 9, the soil is discharged to the outer peripheral position of the hub portion 2a to perform water replacement. A broken line in FIG. 9 indicates a boundary position L2 between the fresh water W and the mud MD. Here, the case where fresh water is injected into the inspection space S from the apparatus main body 3 has been described. However, the present invention is not limited to this, and underground water in the ground may enter the inspection space S (FIG. 4). In-chamber water replacement step 106).

  Subsequently, with the rotation of the cutter head 2 stopped, a cleaning rod (cleaning member: not shown) is inserted into the inspection space S through the communication hole 7a of the partition wall 7, and between the boundary positions L1 and L2 in the fresh water W. The dirt on the cutter head 2 (spoke part 2b, outer ring part 2c, bit 2f, scraper tooth 2g, etc.) is cleaned by high-pressure injection or the like (spoke lower part cleaning step 107 in FIG. 4).

  Thereafter, with the rotation of the cutter head 2 stopped, as shown in FIG. 10A, the inspection member P is inserted into the fresh water W of the inspection space S through the communication hole 7a of the partition wall 7, and between the boundary positions L1 and L2. The cutter head 2 (spoke part 2b, outer ring part 2c, bit 2f, scraper tooth 2g, etc.) is photographed by the camera part P2. The operator inspects the state of the cutter head 2 by visually observing an image photographed by the camera unit P2 inside the apparatus main body 3. Also in this inspection step, not only the state of the cutter head 2 but also the state of the ground GD such as the gravel diameter may be inspected (camera inspection step 108 in FIG. 4).

  Next, while the rotation of the cutter head 2 is stopped, a part of the mud MD in the chamber 4 is discharged to the outside by the screw conveyor 10 as shown by an arrow A8 as shown in FIG. As shown by an arrow A9, fresh water W is injected into the empty space created in the chamber 4 and the upper part of the inspection space S by the soil through the communication hole 7a in the upper part of the partition wall 7. Thereby, the mud MD is replaced with fresh water W.

  The way of soil removal and water replacement work is the same as that in the above-described step 101, but here, as shown in FIGS. 10B and 10, the soil is discharged to the center position of the hub portion 2a to perform water replacement. The broken line in FIG. 10 indicates the boundary position L3 between the fresh water W and the mud MD. Here, the case where fresh water is injected into the inspection space S from the apparatus main body 3 has been described. However, the present invention is not limited to this, and underground water in the ground may enter the inspection space S (FIG. 4). In-chamber water replacement step 109).

  Subsequently, with the rotation of the cutter head 2 stopped, a cleaning rod (cleaning member: not shown) is inserted into the inspection space S through the communication hole 7a of the partition wall 7, and between the boundary positions L2 and L3 in the fresh water W. Dirt on the cutter head 2 (hub portion 2a, spoke portion 2b, outer ring portion 2c, center bit 2e, scraper tooth 2g, etc.) is cleaned by high pressure injection or the like (fish tail cleaning step 110 in FIG. 4).

  Then, with the rotation of the cutter head 2 stopped, as shown in FIG. 12A, the inspection member P is inserted into the fresh water W of the inspection space S through the communication hole 7a of the partition wall 7, and between the boundary positions L2 and L3. A portion of the cutter head 2 (hub portion 2a, spoke portion 2b, outer ring portion 2c, center bit 2e, scraper tooth 2g, etc.) is photographed by the camera portion P2. The operator inspects the state of the cutter head 2 by visually observing an image photographed by the camera unit P2 inside the apparatus main body 3. In this inspection step, not only the state of the cutter head 2 but also the state of the ground GD such as the gravel diameter may be inspected (camera inspection step 111 in FIG. 4).

  After the above inspection process, as shown in FIG. 12B, the bentonite solution B is injected into the chamber 4 through the communication hole 7a of the partition wall 7 as shown by the arrow A10, and the fresh water W in the chamber 4 is bentonite. The face is stabilized by substituting with the solution B (bentonite solution injection step 112 in FIG. 4). Thereafter, the same excavation process as described in FIG.

  Next, FIG. 13 is a main part configuration diagram showing the inside of a shield machine according to another example of this embodiment as seen through the side, and FIG. 14 is a front view of a cutter head of the shield machine of FIG.

  The shield machine 1 in FIG. 13 is, for example, a mud pressure shield machine with an outer peripheral support drive system. On the front surface of the device body 3 of the shield machine 1, for example, as shown in FIG. 14, a state in which a face plate type disc-shaped cutter head 2 can rotate in the forward and reverse directions along the circumferential direction of the device body 3. It is installed at.

  In the center of the front surface of the cutter head 2, a center cutter 2i is installed in a rotatable state. An inner cutter 2j and a gauge cutter 2k are installed on the outer peripheral side of the front surface of the cutter head 2 in a rotatable state. A bit 2m and a copy cutter 2h are installed on the outer ring portion 2c. Further, an additive material injection part 12 b is provided on the front surface of the cutter head 2.

  In this case, since the area of the through hole 2d is smaller than that of the spoke-type cutter head 2 described above, when the cutter head 2 is inspected, the position of the through hole 2d on the front surface of the cutter head 2 and the communication through which the inspection member P is inserted. The cutter head 2 is stopped so that the position of the hole 7a coincides. Then, the camera part P2 of the inspection member P is inserted into the inspection space S from the inside of the apparatus main body 3 through the communication hole 7a and the through hole 2d. Thus, the face plate type cutter head 2 can be inspected in the same manner as described above.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the embodiment disclosed in this specification is an example in all respects and is limited to the disclosed technology. It should be considered not a thing. That is, the technical scope of the present invention should not be construed restrictively based on the description in the above-described embodiment, but should be construed according to the description of the scope of claims. All modifications are included without departing from the technical scope equivalent to the described technique and the gist of the claims.

  For example, in the above-described embodiment, the case where the ribbon screw conveyor is used has been described. However, the present invention is not limited to this, and various modifications can be made. For example, a screw conveyor combining a ribbon type and a shaft type is used. May be.

  In the above description, the case where the present invention is applied to a shield construction method using a mud pressure shield excavator of a center shaft drive system or an outer periphery support drive system is described, but the present invention is not limited to this, for example, an intermediate support drive You may apply to the shield construction method using a mud pressure shield machine of a method.

DESCRIPTION OF SYMBOLS 1 Shield machine 2 Cutter head 2a Hub part 2b Spoke part 2c Outer ring part 2d Through-hole 2e Center bit 2f Bit 2g Scraper tooth 2h Copy cutter 2i Center cutter 2j Inner cutter 2k Gauge cutter 3 Equipment body 4 Chamber 7 Bulkhead 7a Communication hole 9a Folding jack 9b Shield jack 10 Screw conveyor GD Ground EH Drilling mine P Inspection member P1 Rod part P2 Camera part

Claims (3)

Forming the excavation pit in the ground by rotating the cutter board in a state where the mud pressure by the mud filled in the chamber between the cutter board of the shield machine and the equipment body is opposed to the pressure of the face,
After stopping rotation of the cutter board, retreating the shield machine to form an inspection space between the cutter board and the face,
After the formation of the inspection space, the mud soil in the chamber is discharged in a state in which the rotation of the cutter board is stopped, and water replacement is performed to put water into empty areas formed in the chamber and the inspection space by the discharge Process,
After the water replacement step, a step of inspecting the state of the cutter board by inserting a photographing means for inspection into the inspection space from the inside of the device body and photographing an image of the cutter board;
A method for inspecting a cutter board of a shield machine.   In the water replacement step, the mud in the chamber is discharged in a plurality of times, and water is poured into empty areas in the chamber and the inspection space each time the water is discharged. Inspection method of the cutter board of the shield machine as described.   The inspection of the cutter board of the shield machine according to claim 1 or 2, further comprising a step of adding a flocculant into the water in the empty area after the water replacement process and before the inspection process of the cutter board. Method.

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