JP2015086538A - Shield machine and its excavation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a construction speed in an excavation pit.SOLUTION: A plurality of upper/lower expansion type segment holding devices 17 which are connected to move a towing member 16 towing a support carriage 5 etc., following up a movement of a shield machine 1, and also hold a segment SG in an excavation pit are installed behind the shield machine 1. The segment holding devices 17 each can hold the segment SG by extending upper and lower holding parts 17a and move to the side of a segment assembly position by a slide jack 21 while mounted on the towing member 16 after the segment SG is released from being held.

Description

  The present invention relates to a shield excavator and a method for excavating the shield excavator, for example, a technique related to shape maintenance of a segment assembled in an excavation mine during excavation work.

  The shield machine excavates the natural ground by rotating the cutter board pressed against the face while stabilizing the face, while the segment carried from the outside is tunneled by attaching it to the inner periphery of the excavation pit with an elector Is a device that forms.

  In the excavation work, the shield excavator is excavated for one segment with the upper and lower segments held by the segment holding device of the vertical expansion method at the tip side of the excavation mine, and then the rear part of the shield excavator and the excavation mine are excavated by excavation. A new segment is assembled in a free space generated between the leading segment.

  The segment shape holding device is described in, for example, Patent Document 1, and in a segment shape holding device that holds a segment covered in a non-circular shaped non-circular tunnel from the inside, a plurality of shape holding units are shielded. A configuration arranged in series in the axial direction is disclosed.

  Further, for example, Patent Document 2 discloses a vertically expandable segment shape holding device.

  Further, for example, Patent Document 3 discloses a vertically expandable segment shape holding device that can respond to changes in the segment inner diameter.

JP 2000-328898 A JP 2003-120198 A JP 2001-254599 A

  By the way, in the shield excavation work, how to improve the construction speed of the excavation mine is an important issue.

  This invention is made | formed from the above-mentioned technical background, The objective is to provide the technique which can improve the construction speed of an excavation mine.

  In order to solve the above-mentioned problems, a shield machine according to the present invention as set forth in claim 1 is a cutter board rotatably installed on the front surface of a device main body, a moving means disposed behind the device main body, A traction member that is installed in a state extending from the device main body to the moving means, connects the moving means to the device main body, and pulls to follow the excavation of the device main body, and excavates behind the device main body. It is installed so that it can hold the segment including concrete in the mine, and it is installed so that it can move along the extending direction of the traction member while being mounted on the traction member when releasing the holding of the segment. Segment holding means.

  The present invention according to claim 2 is the invention according to claim 1, wherein the segment holding means is a plurality of segment holding means arranged in a state of being connected along the extending direction of the traction member. It is characterized by comprising.

  In addition, the present invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the segment holding means includes a temporary storage part for temporarily storing the segment.

  According to a fourth aspect of the present invention, in the invention according to the first, second, or third aspect, the pulling member also serves as a conveyance path for conveying the segment.

  Further, the method for digging the shield machine of the present invention according to claim 5 is: (a) a cutter board rotatably installed on the front surface of the device main body, and a moving means disposed behind the device main body; An excavation position of a shield machine provided with a traction member installed in a state extending from the device main body to the moving means, and connecting the moving means to the device main body and pulling the device main body to follow the excavation And (b) excavating a natural ground by holding the segment in the excavation pit by segment holding means installed behind the device main body and then moving the device main body forward while rotating the cutter board. And (c) after the step (b), the process of assembling the segment on the inner periphery of the excavation mine while maintaining the position and the segment holding state of the segment holding means in the step (b) And (d) after the step (c), the segment holding means releases the holding state of the segment, and the segment holding means is mounted on the pulling member along the extending direction of the pulling member. And a step of moving to the device main body side.

  Further, the present invention according to claim 6 is the invention according to claim 5, wherein, in the holding step of the segment in the excavation mine, a plurality of segments arranged along the extending direction of the traction member, It is held by a plurality of segment holding means arranged in a connected state along the extending direction of the pulling member.

  The invention according to claim 7 is the invention according to claim 5 or 6, further comprising a step of temporarily placing the segment on the segment holding means.

  The invention according to claim 8 is the invention according to claim 5, 6 or 7, further comprising a step of transporting the segment to a segment assembly position using the pulling member as a transport path.

  According to invention of Claim 1, it becomes possible to improve the construction speed of an excavation mine.

  According to the invention described in claim 2, since the segment holding time can be shortened in the excavation process for one cycle, the construction speed of the excavation mine can be further improved.

  According to invention of Claim 3, since a segment can be efficiently conveyed to a segment assembly position, it becomes possible to improve the construction speed of an excavation mine.

  According to the invention of claim 4, the work space in the excavation mine can be secured widely compared to the case where a transport path for segment conveyance is separately installed, and the work in the excavation mine can be facilitated. The construction speed of the excavation mine can be improved.

  According to invention of Claim 5, it becomes possible to improve the construction speed of an excavation mine.

  According to the sixth aspect of the present invention, since the segment holding time can be shortened in the excavation process for one cycle, the construction speed of the excavation mine can be further improved.

  According to invention of Claim 7, since a segment can be efficiently conveyed to a segment assembly position, it becomes possible to improve the construction speed of an excavation mine.

  According to the invention described in claim 8, since it is possible to ensure a wide working space in the excavation mine compared to the case where a transport path for segment conveyance is separately installed, work in the excavation mine can be facilitated, The construction speed of the excavation mine can be improved.

It is the principal part block diagram which looked through the inside of the shield machine which concerns on one embodiment of this invention from the side. (A) is the block diagram which expanded and showed the principal part of the shield machine of FIG. 1 at the time of a segment holding state, (b) is the front view of the shield machine seen from the direction of arrow A 1 of FIG. 2 (a) It is. (A) is the block diagram which expanded and showed the principal part of the shield machine of FIG. 1 at the time of a segment holding | maintenance cancellation | release state, (b) is the front of the shield machine seen from the direction of arrow A1 of FIG. 3 (a) FIG. It is the block diagram which looked at the shield machine in the excavation preparation stage from the side. It is the block diagram which looked at the shield machine after completion of excavation for 1 segment from the side. It is the block diagram which looked at the shield machine from the segment assembly stage from the side. It is the block diagram which looked at the shield machine in the movement process of a segment holding device from the side. It is the block diagram which looked at the shield machine from the side in the movement process of the segment holding | maintenance apparatus following 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.

  FIG. 1 is a main part configuration diagram showing the inside of the shield machine according to the present embodiment as seen through the side.

  The shield machine 1 of the present embodiment pumps muddy water by a mud pump into a muddy water chamber 4 provided in the device main body 3 behind the cutter head (cutter board) 2, and the muddy water pressure in the muddy water chamber 4. This is a muddy water type shield machine that forms an excavation pit in the natural ground by rotating the cutter head 2 against the face while rotating the face with the pressure corresponding to the earth pressure and groundwater pressure of the face.

  In the shield machine 1, a support cart (moving means) 5 and a transport cart (not shown) are arranged behind the device main body 3 in a movable state along the longitudinal direction of the excavation mine. The operation of the shield machine 1 is operated by an operator in a driver's cab in a subsequent carriage (not shown) connected to the rear of the support carriage 5. Moreover, the whole operation | movement of the shield machine 1 is controlled by the control part provided in the cab. The excavation mine constructed by the shield machine 1 is not particularly limited, but is an excavation mine having a segment outer diameter Rt of about 3100 mm, for example.

  The cutter head 2 constituting the shield machine 1 is a front circular member that excavates the face of a natural mountain, and is rotatable in the forward and reverse directions along the circumferential direction of the device body 3 on the front surface of the device body 3 It is installed at.

  The cutter head 2 is, for example, a spoke type, and a plurality of bits 2a for crushing cobblestones or excavating natural ground are mounted on the front surface (surface facing the face).

  Further, a through hole (not shown) communicating with the muddy water chamber 4 is formed in the front surface of the cutter head 2, and earth and sand etc. excavated by the rotation of the cutter head 2 is muddy water through the through hole of the cutter head 2. It is taken into the chamber 4.

  A copy bit (not shown) is installed on the outer peripheral surface of the cutter head 2. The copy bit has a role of performing extra drilling during sharp curve construction, attitude control of the shield machine 1 and the like.

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

  The front body plate 3 a and the rear body plate 3 b are formed of, for example, a cylindrical steel plate, and are members that form an outer shape of the device body 3 and form a hollow space inside the device 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. Are combined.

  The tail seal 3c is a sealing member for preventing groundwater or the like from entering the equipment body 3 from the rear part of the equipment body 3 during excavation work, and is provided on the outer periphery of the back body plate 3b at the rear end part of the back body 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 inside of the device main body 3 into a face side and an inside of the machine is installed at a position retracted inward of the device main body 3 from the front surface. The muddy water chamber 4 is installed on the face side of the partition wall 7, that is, between the cutter head 2 and the partition wall 7. The muddy water chamber 4 is a space that takes in the earth and sand excavated by the rotation of the cutter head 2 and mixes it with muddy water.

  On the other hand, in the machine main body 3, the cutter driving body 10, the bent jack 11 a, the shield jack 11 b, the erector 12, the mud pipe 13, the mud pipe 14, and the support 15 are provided inside the partition wall 7. A pulling member 16 and a plurality of segment holding devices (segment holding means) 17 are installed.

  The cutter driver 10 is a drive source that rotates the cutter head 2. Here, a center shaft driving system in which the cutter driving body 10 is arranged at the center in the front of the cutter head 2 is illustrated.

  The middle-folded jack 11a is a device that connects the front body plate 3a and the rear body plate 3b and corrects the propulsion direction of the shield machine 1, and in the device body 3, the front body plate 3a and the rear body plate 3b A plurality of the shield machines 1 are arranged side by side along the circumferential direction of the shield machine 1 at a position across the boundary. By supplying pressure oil to the bent jack 11a and digging 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 It is possible to control the direction of excavation.

  The shield jack 11b is a device that generates a propulsive force for advancing the shield machine 1 by taking a reaction force on the segment SG laid on the inner periphery of the excavation mine behind the device main body 3. , A plurality of the cylinders are arranged along the circumferential direction of the shield machine 1 at a position straddling the boundary between the front cylinder plate 3a and the rear cylinder plate 3b.

  The segment SG is a member that covers the inner periphery of the excavation mine, and a plurality of segments SG are installed along the circumferential direction of the excavation mine. The segment SG is composed of, for example, a flat concrete segment or a composite segment (a composite structure of concrete and steel). The width of the segment SG (dimension in the direction of excavation) is not particularly limited, but is about 1200 mm and the height (thickness) is about 125 mm, for example.

  The erector 12 is a segment assembling apparatus that grips and turns the segment SG, transfers it to the assembly position in the inner circumferential direction of the excavation mine, and assembles the segment SG. The erector 12 is mounted on the inner side of the rear trunk plate 3b so as to be movable in the longitudinal direction of the excavation mine and to be rotatable in the circumferential direction of the excavation mine.

  The mud pipe 13 is a pipe that supplies muddy water into the muddy water chamber 4. The mud pipe 13 is made of steel.

  The tip end (mud discharge port) of the mud pipe 13 passes through the upper part of the front surface of the partition wall 7 and reaches the muddy water chamber 4. Thereby, the muddy water sent by the mud pipe 13 is supplied into the muddy water chamber 4 from the upper part in the front of the shield machine 1.

  On the other hand, the rear end of the mud pipe 13 is connected to a flexible mud pipe (see reference numeral 13f in FIGS. 2B and 3B) at the rear part of the device body 3. The flexible mud feeding pipe is formed of, for example, a resin or a composite of resin and metal, extends to the outside of the excavation mine, and outside the excavation mine, through a mud pump (not shown), (Not shown). The muddy water tank is connected to a muddy water treatment device (not shown) outside the excavation mine.

  The mud drain pipe 14 is a pipe that discharges mud including the excavated sediment in the mud chamber 4 to the outside of the excavation pit. The drainage pipe 14 is made of, for example, a steel material.

  The tip portion (suction port) of the mud discharge pipe 14 reaches the mud chamber 4 through the lower part of the front surface of the partition wall 7. Thereby, the muddy water in the muddy water chamber 4 is discharged from the lower part in the front of the shield machine 1.

  On the other hand, the rear end portion of the mud pipe 14 is connected to a flexible mud pipe (see reference numeral 14 f in FIG. 2B and FIG. 3B) at the rear part of the device body 3. This flexible mud drain pipe is formed of, for example, a resin or a composite of resin and metal, and extends to the outside of the excavation pit via a mud pump (not shown). It is connected to the processing device.

  That is, after the muddy water including the excavated sediment in the muddy water chamber 4 is transported to the outside of the excavation pit through the drainage pipe 14 and separated into the sediment and muddy water by the mud treatment device outside the excavation mine, the specific gravity and viscosity are adjusted. The muddy water tank is sent to the muddy water chamber 4 (face) through the muddy pipes 13 and 13f. The excavated earth and sand separated by the muddy water treatment device is transported to the outside by a dump or the like. Further, the flexible mud pipe 13f and the mud pipe 14f are supported on the left and right sides of the traction member 16 on the upper side in the excavation mine.

  The support 15 is a member that supports the pulling member 16, and is fixed to the rear end of the device main body 3. A pulling member 16 is connected to the distal end portion of the support 15 so as to be swingable in the lateral direction.

  The pulling member 16 is a member that pulls the support carriage 5 and the like following the excavation of the shield machine 1 and is installed on the ceiling side in the excavation mine. The pulling member 16 is made of, for example, I-type steel, and the rear end thereof is supported by the support carriage 5. The support carriage 5 is connected to the rear end of the traction member 16 so as to be movable along the extending direction of the traction member 16.

  The traction member 16 also serves as a conveyance rail (conveyance path) for conveying the segment SG and other members, and the conveyance device 20 is movable along the extending direction of the traction member 16 below the traction member 16. It is installed in the state of. The transporter 20 is a device that receives the segment SG and the like and transports it to the segment assembly position in the device main body 3.

  By using the traction member 16 as the transport rail of the transport machine 20, the arrangement of the equipment in the excavation mine can be simplified as compared with the case where the transport rail of the transport machine 20 is separately installed. For this reason, since the work area in the excavation mine can be secured widely and the work in the excavation mine can be facilitated, the construction speed of the excavation mine can be improved. Moreover, the cost of the shield machine 1 can be reduced.

  Further, a slide jack 21 is installed on the upper portion of the pulling member 16. The slide jack 21 is a hydraulic jack that moves the segment holding device 17 in the segment holding released state to the segment assembly position side along the extending direction of the pulling member 16.

  The hydraulic circuit of the slide jack 21 is assembled so as to follow the operation of the shield jack 11b, and is set so that the hydraulic pressure of the slide jack 21 is in a free state when the segment is held.

  The segment holding device 17 is a device that temporarily holds the segment SG assembled in the excavation mine at the time of shield excavation work, and is installed behind the device main body 3. Here, the case where the three segment holding | maintenance apparatuses 17 are arrange | positioned along with the extension direction of the traction member 16 is illustrated.

  These three segment holding devices 17 are connected, move together, and can simultaneously hold the segments SG for three rings adjacent to each other in the extending direction of the traction member 16.

  The number of such segment holding devices 17 is determined according to, for example, the distance to dig a day. The number of the segment holding devices 17 may be one, but the stability of holding the segment SG can be improved by arranging a plurality of segment holding devices 17. Moreover, since the holding time of segment SG can be shortened in the excavation process (digging, segment assembly, and backfilling) for 1 cycle so that it may mention later, the construction speed of an excavation mine can be improved.

  In addition, four or more segment holding devices 17 can be installed. However, if the number is too large, the equipment scale becomes large, and the cost of the shield machine 1 increases. On the other hand, when the number of the segment holding devices 17 is about three, the construction speed of the excavation mine can be improved while suppressing the cost of the shield machine 1.

  Each segment holding device 17 is an up-and-down expansion type segment holding device, and is installed in an expandable / contractable state so that the upper (ceiling) side and lower (bottom) side segments SG in the excavation mine can be held and released. Has been.

  Further, as shown in FIG. 3, each segment holding device 17 is installed so as to be movable along the extending direction of the traction member 16 while being mounted on the traction member 16 in the segment holding release state. . By using the pulling member 16 as the transport rail of the segment holding device 17, the arrangement of the equipment in the excavation mine can be simplified as compared with the case where the transport rail of the segment holding device 17 is separately installed. For this reason, since the work area in the excavation mine can be secured widely and the work in the excavation mine can be facilitated, the construction speed of the excavation mine can be improved. Moreover, the cost of the shield machine 1 can be reduced.

  In addition, each segment holding device 17 is configured to support both end sides of each segment SG in the width direction (extending direction of the pulling member 16). Thereby, each segment SG can be supported in a stable state.

  Next, the structure of the segment holding device 17 will be described with reference to FIGS. FIG. 2A is a configuration diagram showing an enlarged main part of the shield machine shown in FIG. 1 in a segment holding state, and FIG. 2B is a shield machine seen from the direction of arrow A1 in FIG. Fig. 3 (a) is an enlarged view of the main part of the shield machine of Fig. 1 in the segment holding release state, and Fig. 3 (b) is an arrow A1 in Fig. 3 (a). It is a front view of the shield machine seen from the direction. 2B and 3B, reference numeral 13f indicates the above-described flexible mud feeding pipe, and reference numeral 14f indicates the above-described flexible mud discharging pipe.

  Each segment holding device 17 has a holding portion 17a, a connecting member 17b, an expansion / contraction jack 17c, a moving roller 17d, and a segment temporary placement stand 17e.

  The holding portion 17a is a member that contacts and holds the upper and lower segments SG in the excavation mine, and two holding portions 17a are arranged on each of the upper and lower sides. As shown in FIG. 2B and FIG. 3B, each holding portion 17a is formed in an arc shape along the circumferential direction of the excavation mine.

  In addition, for example, a rubber pad is attached to the contact surface of the holding portion 17a with the segment SG. Thereby, the damage of segment SG resulting from the contact of the holding | maintenance part 17a can be prevented.

  A pressure transmitter (not shown) is mounted between the upper and lower holding parts 17a and 17a. Thereby, the load applied to the segment SG side from the segment holding device 17 side can be managed. Moreover, when the load more than assumption is added to the segment SG from the segment holding | maintenance apparatus 17, the failure defect of the segment SG can be avoided by sounding an alarm or displaying on a display part.

  The connecting member 17b is a member that connects the holding portions 17a adjacent to each other in the extending direction of the traction member 16 in each segment holding device 17, and includes two upper holding portions 17a and two lower holding portions 17a. Are connected to both ends in the extending direction.

  The telescopic jack 17c is a hydraulic jack that expands and contracts the upper and lower holding portions 17a and 17a (moves in the separating direction and the approaching direction), and is installed between the upper and lower connecting members 17b and 17b in a freely stretchable state.

  The moving roller 17d is a rotating member for moving the segment holding device 17 along the extending direction of the pulling member 16, and is installed on the inner periphery of the upper holding portion 17a in a rotatable state. The moving roller 17d is separated from the traction member 16 when the segment is held, but is in contact with the traction member 16 when the segment holding state is released.

  The segment temporary placement stand 17e is a stand for temporarily placing the segment SG, and is installed on the inner peripheral side of the lower holding portion 17a. By temporarily placing the segment SG on the segment temporary placing stand 17e during the segment assembling work, the efficiency of the segment assembling work can be improved as will be described later.

  Next, an example of the excavation method of the shield machine 1 according to the present embodiment will be described with reference to FIGS.

  In FIG. 4, the position coordinates X0 to X4 of each part of the shield machine 1 are attached, and in FIG. 5 to FIG. 8, the position coordinates X0 to X4 of FIG. The position coordinate X0 indicates the tip position of the cutter head 2 in FIG. 4, the position coordinate X1 indicates the tip position of the segment holding device 17 in FIG. 4, and the position coordinate X2 indicates the position of the transport machine 20 in FIG. The position coordinate X3 indicates the rear end position of the slide jack 21 in FIG. 4, and the position coordinate X4 indicates the front end position of the support carriage 5 in FIG.

  First, FIG. 4 is a configuration diagram of the shield machine from the side of the excavation preparation stage.

  At this stage, the upper and lower holding portions 17a and 17a of each segment holding device 17 are extended by extending the telescopic jacks 17c of the three segment holding devices 17 located behind the shield machine 1 disposed at the excavation position of the natural ground. Is pressed against the upper and lower segments SG and SG in the excavation mine to hold the segments SG and SG for the upper and lower three rings in the excavation mine.

  Here, the segment SG held by the segment holding device 17 at the most distal end in the digging direction is the segment SG (the segment SG outside the rear end outside the device main body 3) exposed to the natural ground in the digging direction. Hereinafter, it is also referred to as a key segment SG).

  Moreover, each segment holding | maintenance apparatus 17 supports two places of the width direction (extension direction of the traction member 16) of each segment SG corresponding to each. Thereby, each segment SG can be supported in a stable state.

  The gap between the excavation mine and the segment SG is filled with a backfill material made of a cement-based hardener or solidified material.

  Next, FIG. 5 is a structural view of the shield machine after completion of excavation for one segment as seen from the side.

  At this stage, the ground is excavated by pushing the cutter head 2 against the face and rotating the device body 3 in the direction indicated by the arrow A2 by one segment. At this time, the mud is pumped to the mud chamber 4 by a mud pump, and the pressure of the mud in the mud chamber 4 is adjusted to a pressure corresponding to the earth pressure and groundwater pressure of the face to stabilize the face. In order to stabilize the face, for example, the rotation speed of the cutter head 2, the extension speed of the shield jack 11b, and the mud pressure in the muddy water chamber 4 are adjusted to be constant.

  At this time, the traction member 16 moves forward following the advancement of the shield machine 1, whereas the segment holding device 17 is fixed. Therefore, the slide jack 21 on the traction member 16 is moved by the segment holding device 17. However, since the hydraulic pressure of the slide jack 21 is set to a free state, the slide jack 21 automatically contracts. That is, it is not necessary to cause the slide jack 21 to perform the contracting operation. For this reason, since complicated timing setting is not required, operation control during excavation can be facilitated.

  In addition, during excavation, the segments SG for the upper and lower three rings in the excavation mine are held by the three segment holding devices 17, so that the ring shape of the segment SG in the excavation mine can be favorably maintained.

  Subsequently, after the excavation process for one segment, preparation for assembling the segments is performed. That is, a transport table 25 such as a roller conveyor is installed in the empty area between the most distal segment holding device 17 and the segment assembly position, and a plurality of new segments SG are provided below the rear end side of the traction member 16. Is transported.

  Next, FIG. 6 is a configuration diagram of the shield machine from the side assembling the segment.

  In this stage, a new segment SG is assembled in the empty area formed between the rear end of the shield jack 11b and the segment SG by the advancement of the shield machine 1. The position of the segment holding device 17 and the segment holding state are maintained.

  First, a new segment SG on the transport carriage 26 is lifted by the transporter 20, and the transporter 20 is moved along the pulling member 16 in the direction of the segment assembly position.

  Thus, by using the traction member 16 as the transport rail of the transport machine 20, the arrangement of the equipment in the excavation mine can be simplified as compared with the case where the transport rail of the transport machine 20 is separately installed. For this reason, the work area in the excavation mine can be secured widely, and the work in the excavation mine can be facilitated. Moreover, since the operation | work which installs the conveyance rail used for conveyance of the conveying machine 20 becomes unnecessary, the construction time of an excavation mine can be shortened. By these, the construction speed of an excavation mine can be improved. Furthermore, the cost of the shield machine 1 can be reduced.

  Subsequently, the new segment SG held by the conveyor 20 is lowered onto the conveyor table 25 and conveyed to the segment assembly position through the conveyor table 25. Then, the new segment SG transported to the segment assembly position is gripped by the erector 12, swung along the inner circumference of the excavation mine, and transferred to the assembly position in the inner circumference direction of the excavation mine, thereby assembling the segment SG.

  On the other hand, while the segment SG is assembled by the erector 12, a new segment SG on the transport carriage 26 is placed on the segment temporary placement base 17 e of each segment holding device 17 by the transporter 20. Then, after the new segment SG is assembled by the erector 12, the new segment SG on the temporary segment mounting base 17e is transported to the segment assembly position by the transporter 20 and the transport base 25.

  When there is no such segment temporary placing stand 17e, the transporter 20 must wait while holding the subsequent segment SG until the assembly of the segment SG by the erector 12 is completed. Takes time to complete.

  On the other hand, in the present embodiment, while one segment SG is assembled by the erector 12, the other segment SG may be transported and placed on the segment temporary placement base 17e by the transport device 20. it can. That is, the conveyor 20 can be moved independently of the operation of the erector 12. Further, when the assembly of one segment SG is completed, the next segment SG may be transported from the position of each segment holding device 17 to the segment assembly position. That is, the transport distance of the segment SG can be shortened. As a result, the segment SG can be assembled efficiently, and the segment SG assembly operation time can be shortened. For this reason, the construction speed of an excavation mine can be improved.

  After assembling the segment SG for one ring as described above, the backfill material is filled in the gap between the excavation mine and the segment SG.

  Next, FIG. 7 and FIG. 8 are structural views of the shield machine from the side in the movement process of the segment holding device.

  At this stage, in order to return to the excavation preparation stage of FIG.

  First, as shown in FIG. 7, after the upper holding portion 17a of each segment holding device 17 is moved downward until the moving roller 17d contacts the pulling member 16, the lower holding portion of each segment holding device 17 is moved. The segment holding device 17 is placed on the pulling member 16 by moving 17a upward. Thereby, the segment holding state is released.

  Then, as shown in FIG. 8, the three segment holding | maintenance apparatuses 17 are pushed to the apparatus main body 3 side by extending the slide jack 21 on the pulling member 16. FIG. Thus, the three segment holding devices 17 are moved to the assembly position of the segment SG along the extending direction of the pulling member 16 by the rotation of the moving roller 17d.

  By using the pulling member 16 as the transport rail of the segment holding device 17 in this way, it is possible to simplify the arrangement of the equipment in the excavation mine as compared with the case where the transport rail of the segment holding device 17 is separately installed. For this reason, the work area in the excavation mine can be secured widely, and the work in the excavation mine can be facilitated. Moreover, since the operation | work which installs the conveyance rail used for the movement of the segment holding | maintenance apparatus 17 becomes unnecessary, the construction time of an excavation mine can be shortened. By these, the construction speed of an excavation mine can be improved. Furthermore, the cost of the shield machine 1 can be reduced.

  Thereafter, as described in FIG. 4, the extension jacks 17c of each segment holding device 17 are extended, and the upper and lower holding portions 17a, 17a are pressed against the upper and lower segments SG, SG in the excavation mine to hold the segments SG, SG. Thereafter, the entire excavation pit is constructed by repeating the steps described with reference to FIGS.

  Here, in the construction of the excavation mine with high water pressure and large depth, when the maximum assumed load is applied to the segment SG assembled in the excavation mine, there is a possibility that the mounting bolt breaks and falls off. Therefore, when the number of the segment holding device 17 is one, the back side of the segment SG after assembling is sufficiently filled with the back filling material, and after waiting for the back filling material to be sufficiently hardened, the segment holding device 17 is moved. It takes time to work because it has shifted to the excavation process.

  On the other hand, in the present embodiment, since a plurality of segment holding devices 17 are provided, when the key segment SG is pressed, the second and subsequent segment holding devices 17 are provided for two rings behind the key segment SG. The segment SG can also be held. For this reason, the segment holding device 17 can be moved to the excavation process before the backfill material on the back side of the key segment SG is sufficiently hardened. For this reason, since the holding time of the key segment SG can be shortened in the excavation process for one cycle (digging, segment assembly and backfilling), the construction speed of the excavation mine can be improved. Moreover, since the usage-amount of backfilling material can be reduced, cost can be reduced.

  Further, since the plurality of segment holding devices 17 are simply moved along the pulling member 16, the structure of the segment holding device 17 can be simplified. For this reason, the cost of the segment holding device 17 can be reduced, and the cost of the shield machine 1 can be reduced.

  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 present invention is applied to a center shaft drive type shield machine has been described. However, the present invention is not limited to this, and various modifications can be made. For example, the outer periphery support drive method and the intermediate support drive method You may apply to a shield machine.

  In the above description, the case where the present invention is applied to a muddy water type shield machine has been described. However, the present invention is not limited to this. For example, the drilling earth and sand and the additive are kneaded in the chamber behind the cutter head. Mud pressure type shield excavator, etc. that excavates in a state filled with mud generated by mixing and generates mud pressure and opposes the mud pressure against the earth pressure of the face. It can also be applied to shield machines.

DESCRIPTION OF SYMBOLS 1 Shield machine 2 Cutter head 3 Main body 3a Front trunk plate 3b Rear trunk plate 3c Tail seal 4 Muddy water chamber 5 Supporting carriage 7 Bulkhead 10 Cutter driving body 11a Folding jack 11b Shield jack 12 Electors 13, 13f Mud pipe 14, 14f Mud discharge pipe 15 Support body 16 Pulling member 17 Segment holding device 17a Holding portion 17b Connecting member 17c Telescopic jack 17d Moving roller 17e Segment temporary placement stand 20 Transporter 21 Slide jack 25 Transport base 26 Transport cart SG Segment

Claims (8)

A cutter board rotatably installed on the front of the device body,
Moving means arranged behind the device body;
A traction member that is installed in a state extending from the device main body to the moving means, connects the moving means to the device main body, and pulls the device main body to follow the excavation;
It is installed so as to be able to hold the segment including the concrete in the excavation mine behind the equipment main body, and is mounted on the traction member when the segment is released, along the extending direction of the traction member. A segment holding means arranged to be movable;
A shield machine characterized by comprising.   2. The shield machine according to claim 1, wherein the segment holding means includes a plurality of segment holding means arranged in a connected state along the extending direction of the pulling member.   3. The shield machine according to claim 1, wherein the segment holding means includes a temporary placement part for temporarily placing the segment.   The shield excavator according to claim 1, wherein the pulling member also serves as a conveyance path for conveying the segment. (A) a cutter board rotatably installed on the front surface of the device main body, a moving means disposed behind the device main body, and installed in a state extending from the device main body to the moving means; Connecting the machine body to the equipment body, and placing a shield machine at a digging position with a traction member that pulls to follow the machine body digging,
(B) after holding the segment in the excavation mine by the segment holding means installed at the rear of the device main body, and advancing the device main body while rotating the cutter board to excavate natural ground;
(C) After the step (b), assembling the segment on the inner periphery of the excavation mine while maintaining the position and the segment holding state of the segment holding means in the step (b);
(D) After the step (c), the holding state of the segment by the segment holding unit is released, and the device main body is extended along the extending direction of the pulling member in a state where the segment holding unit is mounted on the pulling member. Moving to the side,
A method for digging a shield machine, comprising:   In the step of holding the segment in the excavation mine, a plurality of segment holding means are arranged in a connected state along the extending direction of the traction member by connecting the plurality of segments arranged along the extending direction of the traction member. The method for digging a shield machine according to claim 5, wherein   The method for digging a shield machine according to claim 5 or 6, further comprising a step of temporarily placing the segment on the segment holding means.   The method for digging a shield machine according to claim 5, 6 or 7, further comprising a step of conveying the segment to a segment assembly position using the traction member as a conveyance path.

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