JP4915949B2 - Shield machine and its dismantling method - Google Patents

Description

  The present invention is configured such that when the shield machine is disassembled, the cutter support mechanism is detachable to the rear side together with the cutter drive mechanism in a state in which the cutter mechanism is fixedly supported to the front annular member fixed to the inner surface of the trunk member. The present invention relates to a shield machine and its disassembly method.

  Conventionally, a shield machine has a barrel member, a cutter mechanism having a cutter head disposed on the front end side of the barrel member, a partition wall that partitions the rear end of the chamber inside the front end portion of the barrel member, and the cutter mechanism can be rotated. A cutter support mechanism for supporting the cutter mechanism and a cutter drive mechanism for rotating the cutter mechanism, and a plurality of shield jacks, a soil removal device, an erector, a perfect circle holding device, a rear work deck, and the like (for example, (See Patent Documents 1 and 2).

  In general, in a shield machine, a cutter support mechanism includes a fixed annular member fixedly provided inside a body member and a rear end portion of the cutter mechanism that is rotatably supported by the fixed annular member. The cutter driving mechanism includes a ring gear coupled to the rear end portion of the movable ring member, a plurality of pinions that mesh with the ring gear, and a plurality of motors that respectively rotate the plurality of pinions.

  By the way, when the shield machine reaches a predetermined excavation completion position, the shield machine will be dismantled and its built-in parts can be reused, but the tunnel excavated by this shield machine and other shield machines When disassembling a shield machine in the ground, such as when connecting to a tunnel excavated by a machine, when receiving earth water pressure from the chamber side, be sure to accept the earth water pressure. It is necessary to disassemble the built-in components so that earth and sand, muddy water, and the like in the chamber do not enter the rear side of the partition wall in the body member.

  In the shield machine of Patent Document 1, the fixed annular member is fixed to the inner surface of the trunk member, the movable ring member is rotatably fitted in the fixed annular member, and the inner fixed member is positioned radially inside the fixed annular member. The ring member is rotatably fitted on the annular member. Between the movable ring member and the fixed annular member and between the inner fixed annular member are respectively sealed with annular seals, and rear ends of a plurality of beams extending rearward from the cutter head are connected to the movable ring member. An annular holder is provided with its front end and rear end fixed to a fixed annular member and a body member, a plurality of motors are fixed to the annular holder, and an inner fixed annular member is connected and supported.

  At the time of disassembly, the annular holder is separated from the fixed annular member, the inner fixed annular member, and the body member, and the ring gear is separated from the movable ring member, and the cutter driving mechanism is removed to the rear side together with the annular holder. At this time, the outer peripheral side portion of the rear end portion of the annular holder is divided and left on the body member so that the annular holder does not interfere with the segments assembled on the inner surface of the tunnel. In addition, a plurality of shield jacks are attached in a penetrating manner to the outer peripheral side portion of the rear end portion of the annular holder. When removing the annular holder to the rear side, the plurality of shield jacks are moved to the center side, Remove the shield jack.

  In the shield machine of Patent Document 2, the guide tube is fixed to the inner surface of the body member, the shaft drive tube is removably fitted to the guide tube, and the garter ring is connected to the rear end portion of the shaft drive tube. It is fixed to the inner surface of the member. The partition wall includes a fixed partition wall on the front surface of the guide tube and the shaft drive tube, and a movable partition wall positioned on the inner end side of the fixed partition wall, and a rear end portion of the shaft portion extending rearward from the cutter head is connected to the movable partition wall. ing. A fixed annular member is fixedly provided inside the shaft drive cylinder, and a movable ring member is rotatably fitted around the fixed annular member and connected to the movable partition wall.

  At the time of disassembly, the gartering is separated from the body member, and the cutter mechanism, the cutter support mechanism, and the cutter drive mechanism are moved backward together with the shaft drive cylinder. At that time, in the cutter mechanism, the outer peripheral portion of the cutter head is divided and left on the front end side of the body member, and the cutter head with the backing inner lid attached in advance to the front portion is moved backward to enter the front end portion of the guide tube. Then, the front end of the guide cylinder is closed and sealed with a backing inner lid, and then the cutter mechanism, cutter support mechanism, and cutter drive mechanism are pulled out from the guide cylinder and removed together with the shaft drive cylinder.

JP 2007-9691 A JP 2007-92412 A

  When dismantling the shield machine in the ground, the earth pressure received from the chamber side is usually reduced, so that the earth and mud in the chamber do not enter the rear side of the bulkhead in the body member, in front of the bulkhead. After injecting ground improvement material and improving the excavated soil in the chamber and the ground in front of the cutter head, the cutter support mechanism and the cutter drive mechanism are removed and dismantled. It takes a lot of time, and after that, it takes a considerable amount of time to disassemble the cutter support mechanism and cutter drive mechanism, so the time required for disassembling the shield machine becomes very long and shortens the construction period of the entire tunnel construction. It is difficult.

  In the shield machine of Patent Document 1, when the cutter drive mechanism is removed to the rear side together with the annular holder, the state in which the cutter mechanism is supported by the cutter support mechanism is maintained, and between the movable ring member and the fixed annular member and between the inner fixed annular member Therefore, the cutter support mechanism cannot be disassembled, and the cutter support mechanism will be disassembled after the ground improvement is completed. The time required for dismantling cannot be shortened.

  Further, when the annular holder is separated from the inner fixed annular member and the ring gear is separated from the movable ring member, the supporting strength of the inner fixed annular member and the movable ring member is increased so that it can withstand the earth and water pressure received from the chamber side. Therefore, it is necessary to connect and support the inner fixed annular member and the movable ring member with respect to the fixed annular member before removing the annular holder. However, Patent Document 1 has no description of this point. Even in such a case, the work required for removing the cutter driving mechanism together with the annular holder is increased and becomes complicated.

  In the shield machine of Patent Document 2, when the cutter mechanism, the cutter support mechanism, and the cutter drive mechanism are retracted together with the shaft driving cylinder, it is necessary to support the soil-side pressure on the chamber side with a plurality of shield jacks. The cutter mechanism, the cutter support mechanism, and the cutter drive mechanism can be retracted while filling the ground improvement material in the chamber and stopping the water, but the cutter head is retracted together with the backing inner lid in the chamber. Therefore, the load and time for accommodating the cutter head in the front end portion of the guide cylinder are increased.

  In addition, the backing inner lid that closes the front end of the guide tube is initially provided in a non-closed state in the cutter head, and in use, the tube is inflated to be in a closed state, but it can withstand the soil pressure on the chamber side. If the shaft drive cylinder or the like is pulled out of the guide cylinder, there is a possibility that earth and sand or muddy water in the chamber may enter the guide cylinder. In order to avoid this, if the inside of the chamber is hardened with mortar and then the shaft drive cylinder is pulled out from the guide cylinder, the time required for disassembling the shield machine will be the same as in the conventional shield machine. Become very long.

  The object of the present invention is to remove the cutter support mechanism and the cutter drive mechanism in parallel with the ground improvement after the shield machine has reached the excavation completion position, and to perform this disassembly simply and securely. It is possible to provide a shield excavator and a method for disassembling the shield excavator that can shorten the time required for dismantling the shield excavator, that is, the construction period of the entire tunnel construction as much as possible.

  The shield machine according to claim 1 includes a barrel member, a cutter mechanism having a cutter head disposed on the front end side of the barrel member, and a partition wall that partitions the rear end of the chamber inside the front end portion of the barrel member. In the excavator, the outer peripheral portion is fixed to the inner surface of the barrel member, and the front annular member having a fixed partition wall that forms the outer peripheral side portion of the partition wall on the front surface portion, and the rear end portion of the cutter mechanism A movable partition that is located on the front side of the fixed partition and forms at least a part of the central portion of the partition, and is detachably mounted on the inner periphery of the front annular member so as to be detachable rearward. A cutter support mechanism that rotatably supports the cutter mechanism via a movable partition; a cutter drive mechanism that is mounted on the cutter support mechanism and that rotates the cutter mechanism via the movable partition; and an outer peripheral side portion of the movable partition An annular seal that seals between the fixed bulkhead and the shield bulkhead, and the movable bulkhead can be rotated relative to the fixed bulkhead during the excavation operation of the shield machine, and the outer peripheral portion of the movable bulkhead when the shield machine is disassembled And a connection support mechanism for connecting and fixing the cutter mechanism to the front annular member.

  A partition partitioning the rear end of the chamber inside the front end portion of the body member includes a movable partition wall on the front surface of the front annular member whose outer periphery is fixed to the inner surface of the body member, and a cutter disposed on the front end side of the body member And a movable partition wall provided at the rear end portion of the cutter mechanism having the head. A cutter support mechanism and a cutter drive mechanism are provided on the rear side of the movable partition. The cutter support mechanism is equipped with a cutter drive mechanism. The cutter support mechanism is rotatably supported by the cutter support mechanism. The cutter mechanism is rotationally driven through the movable partition wall.

  The outer peripheral portion of the movable partition is located on the front side of the fixed partition, and the annular seal seals between the outer peripheral portion of the movable partition and the fixed partition. Water is stopped so as not to enter the side. A connection support mechanism that can connect / disconnect the outer peripheral portion of the movable partition wall and the fixed partition wall is provided, and this connection support mechanism connects the outer peripheral portion of the movable partition wall and the fixed partition wall during the digging operation of the shield machine. It is released and the movable partition is held in a rotatable state with respect to the fixed partition, and when the shield machine is disassembled, the movable partition is movable with an annular seal sealed between the outer peripheral portion of the movable partition and the fixed partition. The outer peripheral side portion of the partition and the fixed partition are connected, and the cutter mechanism is fixedly supported by the front annular member via the movable partition.

  In a state where the cutter mechanism is fixedly supported by the front annular member by the connection support mechanism, the cutter support mechanism is separated from the movable partition wall, and the one supporting the cutter mechanism is transferred from the cutter support mechanism to the front annular member. The cutter support mechanism is separated from the front annular member, and the cutter support mechanism is removed to the rear side with respect to the front annular member together with the cutter drive mechanism and disassembled. At that time, in the state where the excavated soil in the chamber and the ground in front of the cutter head are not improved, the soil and water pressure on the chamber side is reliably received by the partition including the movable partition, and the outer peripheral side of the movable partition by the annular seal Since the space between the portion and the fixed partition is sealed, it is possible to prevent earth and sand, muddy water, and the like in the chamber from entering the rear side of the partition in the trunk member.

  The following configurations can be adopted as the dependent claims. The cutter support mechanism includes a fixed annular member that is fitted in the inner peripheral portion of the front annular member and is fixed so as to be unlockable. The cutter support mechanism is rotatably supported by the fixed annular member and can be fixedly released to the movable partition wall. A movable ring member that is fixed, and the cutter driving mechanism is fixed to a ring gear coupled to a rear end portion of the movable ring member, a plurality of pinions that mesh with the ring gear, and a plurality of pinions that are fixed to the fixed annular member. And a plurality of motors that respectively rotate the pinion.

  The outer circumferential portion of the fixed annular member can be received by the front annular member so that the reaction force in the rotational direction and the rearward direction transmitted from the cutter mechanism to the stationary annular member via the movable ring member of the cutter support mechanism can be received by the front annular member. A plurality of first reaction force receivers that are releasably connected to the inner peripheral portion are provided at appropriate intervals in the circumferential direction. The front ring member abuts against the rear end of the fixed annular member from the rear side so that a backward reaction force transmitted from the cutter mechanism to the fixed annular member via the movable ring member of the cutter support mechanism can be received by the front annular member. A plurality of second reaction force receivers that are releasably connected to the inner peripheral part of the annular member are provided at appropriate intervals in the circumferential direction.

  The connection support mechanism includes a plurality of screw hole portions disposed at an appropriate interval in the circumferential direction on the outer peripheral side portion of the movable partition wall and formed in a rearward open shape, and a plurality of screw hole portions disposed in the fixed partition wall. A plurality of bolt members that are arranged at appropriate intervals in the circumferential direction and are inserted through the fixed partition wall so as to be non-projecting forward with respect to the fixed partition wall. And a plurality of bolt members that are operated from the rear side and project forward and screwed into the screw holes. The connection support mechanism is a fastening nut member screwed to each bolt member so as to be fitted on the rear side of the fixed partition wall, and the bolt member is screwed into the screw hole portion and It has a fastening nut member which is operated from the side and fastens the movable partition wall to the fixed partition wall via the bolt member.

  A plurality of bolt through-holes each having an annular seal holding member that is fixed to the rear surface of the movable partition wall and holds an annular seal are formed in the seal holding member. ) The seal holding member includes an inner peripheral side seal holding member and an outer peripheral side seal holding member that sandwich the annular seal from inside and outside in the radial direction, and the plurality of bolt through holes are formed in the inner peripheral side seal holding member ( Claim 8). The connection support mechanism is a fixed nut member through which the bolt members are inserted and screwed into the fixed partition wall so as to be non-projecting forward from the fixed partition wall and from the rear side of the fixed partition wall. A plurality of fixing nut members which are operated to protrude forward and are pressed against the seal holding member are provided. The movable partition is formed in a disc shape (claim 10).

  The movable partition is formed in a ring shape, the outer peripheral side portion is located on the front side or the rear side of the movable partition, forms the center side portion of the partition, and is fixed to the fixed annular member so as to be unlockable. During the digging operation of the center-side fixed bulkhead and the shield machine, the movable bulkhead is held in a rotatable state with respect to the center-side fixed bulkhead while the center-side fixed bulkhead is fixed to the fixed annular member, and the shield digging is performed. When disassembling the machine, a second connecting support mechanism is provided that connects the outer peripheral side portion of the center-side fixed partition wall and the movable partition wall, and can be supported by the movable partition wall in a state where the center-side fixed partition wall is unfixed from the fixed annular member. (Claim 11). An agitator having a cylindrical member fixed in a penetrating manner in a central portion of the movable partition wall, an attachment base inserted through the cylindrical member, and a wing portion fixed in a front end of the attachment base and disposed in the chamber; A sealing member that seals between the cylindrical member and the mounting base of the agitator; a first agitator fixing mechanism that fixes the mounting base of the agitator to a fixed annular member so as to be unreleasable; and a mounting base of the agitator on the cylindrical member A second agitator fixing mechanism that is fixed and can be supported by the tubular member in a state where the fixing base of the agitator is released from the fixed annular member is provided.

  A method for disassembling a shield machine according to claim 13 is a method for disassembling a shield machine for disassembling the shield machine according to claim 1, wherein the shield seal machine reaches a predetermined excavation completion position, and then the annular seal is disassembled. In the state where the outer peripheral side portion of the movable partition wall and the fixed partition wall are sealed, the outer peripheral side portion of the movable partition wall and the fixed partition wall are connected by the connection support mechanism, and the cutter mechanism and the movable partition wall are used as the front annular member. A connecting and supporting step for fixing and supporting, a separating step for separating the cutter supporting mechanism from the movable partition wall, and separating the cutter supporting mechanism from the front annular member, and then a cutter for the front annular member. And a removal step of removing the support mechanism together with the cutter drive mechanism to the rear side.

  The following configuration can be adopted as a dependent claim. It is executed in parallel with at least the steps after the connection support step, and includes a ground improvement step of injecting a ground improvement material in front of the partition wall to improve excavated soil in the chamber and a ground in front of the cutter head. 14). After the ground improvement step, a final disassembly step of disassembling the front annular member, the movable partition wall, and the cutter mechanism is provided (claim 15).

  According to the shield machine of claim 1, the cutter mechanism is rotatably supported by the cutter support mechanism via the movable partition provided at the rear end portion thereof, and is driven to rotate by the cutter drive mechanism via the movable partition. The outer peripheral portion of the partition wall is positioned on the front side of the fixed partition wall, and the space between the outer peripheral side portion of the movable partition wall and the fixed partition wall is sealed by an annular seal. The outer peripheral side portion of the movable partition wall is released from the fixed partition wall, and the movable partition wall is held in a rotatable state with respect to the fixed partition wall. The cutter mechanism can be fixedly supported to the front annular member through the movable partition wall by connecting the outer peripheral side portion of the movable partition wall and the fixed partition wall in a state where the gap is sealed.

  Therefore, in a state where the cutter mechanism is fixedly supported by the front annular member by the connection support mechanism, the cutter support mechanism is separated from the movable partition, and the cutter support mechanism is moved from the cutter support mechanism to the front annular member. Also, the cutter support mechanism can be separated from the front annular member, and the cutter support mechanism can be detached from the front annular member together with the cutter drive mechanism and disassembled. In the state where the ground in front is not improved (ground improvement), the soil pressure on the chamber side can be reliably received by the partition including the movable partition. Since the gap is sealed, it is possible to prevent soil and sand, muddy water, and the like in the chamber from entering the rear side of the partition wall in the trunk member.

  That is, after the shield machine reaches the excavation completion position, the cutter support mechanism and the cutter drive mechanism can be removed and disassembled in parallel with the ground improvement, and this disassembly can be performed easily, reliably and safely. After the ground improvement is completed, the front annular member, the movable partition wall, the cutter mechanism, and the like can be smoothly disassembled, so that the time required for disassembling the shield machine, that is, the entire construction period of the tunnel construction can be shortened as much as possible.

  According to the shield machine of claim 2, the cutter support mechanism includes a fixed annular member that is fitted in the inner peripheral portion of the front annular member and is fixed so as to be unlocked, and is rotatably fitted in the fixed annular member. A movable ring member supported and fixed to the movable partition so as to be unreleasable, and a cutter driving mechanism coupled to a rear end of the movable ring member, and a plurality of pinions meshing with the ring gear; Since it has a plurality of motors that are fixed to a fixed annular member and rotate a plurality of pinions respectively, a cutter support mechanism and a cutter drive mechanism are provided on the rear side of the movable partition wall, so that the cutter mechanism can be reliably supported to be rotatable. The cutter support mechanism and the cutter drive mechanism can be reliably removed from the front annular member to the rear side so that the cutter support mechanism can be rotated.

  According to the shield machine of claim 3, the front ring member can receive the reaction force transmitted from the cutter mechanism to the fixed ring member via the movable ring member of the cutter support mechanism. Since the plurality of first reaction force receivers that releasably connect the outer peripheral portion of the member to the inner peripheral portion of the front annular member are provided at appropriate intervals in the circumferential direction, a plurality of first reaction forces are received during the excavation operation of the shield machine. By connecting the outer peripheral portion of the fixed annular member to the inner peripheral portion of the front annular member by the reaction force receiver, the reaction force in the rotational direction and the rearward direction can be reliably received by the front annular member. The outer peripheral portion of the fixed annular member is released from the inner peripheral portion of the front annular member by receiving one reaction force, and the cutter support mechanism can be detached from the front annular member together with the cutter driving mechanism to be disassembled.

  According to the shield machine of the fourth aspect of the present invention, the rear annular reaction force transmitted from the cutter mechanism to the fixed annular member via the movable ring member of the cutter support mechanism can be received by the front annular member, Since the plurality of second reaction force receivers that come into contact with the end portion from the rear side and are releasably connected to the inner peripheral portion of the front annular member are provided at appropriate intervals in the circumferential direction, during the digging operation of the shield machine The plurality of second reaction force receivers can be coupled to the inner peripheral portion of the front annular member so that the backward reaction force can be more reliably received by the front annular member. Can be disconnected from the inner peripheral portion of the fixed annular member, and the cutter support mechanism can be detached together with the cutter drive mechanism to the rear side and disassembled.

  According to the shield machine of claim 5, the connection support mechanism includes a plurality of screw hole portions that are arranged at appropriate intervals in the circumferential direction on the outer peripheral side portion of the movable partition wall and are formed in a rearward open shape, and the fixed partition wall. A plurality of bolt members arranged at appropriate intervals in the circumferential direction corresponding to the arrangement of the plurality of screw holes, and inserted into the fixed partition so as to be non-projecting forward with respect to the fixed partition. And a plurality of bolt members that are operated from the rear side of the fixed partition wall and project forward and screwed into the screw holes, so that when the shield machine is disassembled, the plurality of bolt members are operated from the inside of the machine. Thus, the outer peripheral side portion of the movable partition wall and the fixed partition wall can be coupled by being screwed into the plurality of screw holes.

  According to the shield machine of claim 6, the connection support mechanism is a fastening nut member that is screwed to each bolt member so as to be fitted on the rear side of the fixed partition wall, and the bolt member is screwed into the screw hole portion. In this state, a fastening nut member that is operated from the rear side of the fixed partition wall and fastens the movable partition wall to the fixed partition wall via the bolt member is operated. When the shield machine is disassembled, a plurality of fastening nut members are operated from the inside of the machine. Thus, the movable partition can be reliably fastened to the fixed partition via the plurality of bolt members by these fastening nut members.

  According to the shield machine of claim 7, the plurality of bolts penetrating through the plurality of screw holes respectively having the annular seal holding member that is fixed to the rear surface of the movable partition wall and holds the annular seal. Since the hole is formed, the seal holding member is effectively used without being restricted by the arrangement of the seal holding member, and a plurality of bolt members are threaded through the plurality of bolt through holes and screwed into the plurality of screw holes, respectively. Can be made.

  According to the shield machine of claim 8, the seal holding member includes an inner peripheral side seal holding member and an outer peripheral side seal holding member that sandwich the annular seal from the inside and outside in the radial direction, and the plurality of bolt through holes are arranged on the inner side. Since the seal holding member is formed, the inner peripheral side seal holding member is effectively used without being restricted by the arrangement of the inner peripheral side seal holding member, and the same effect as in the seventh aspect is achieved. Thus, it is possible to prevent the earth and sand, muddy water, etc. in the chamber from flowing into the bolt through hole and the screw hole portion, and to reliably operate the connection support mechanism.

  According to the shield machine of the ninth aspect, the connection support mechanism is a fixed nut member into which each bolt member is inserted and screwed into the fixed partition so as to be non-projecting forward in the fixed partition. Since it has a fixed nut member that is operated from the rear side of the fixed partition wall and protrudes forward and pressed against the seal holding member, a plurality of fixed nut members are operated from the inside of the machine when the shield machine is disassembled, and the seal is held. By pressing the member, a bolt passage can be secured in the screw hole portion of the bolt member, and then the bolt member can be reliably screwed into the screw hole portion.

  According to the shield machine of claim 10, since the movable partition is formed in a disc shape, the structure of the partition is simplified, and when the shield machine is disassembled, the outer peripheral side portion of the movable partition and the fixed partition are separated by the connection support mechanism. By simply connecting the two, the soil pressure on the chamber side can be reliably received by the partition wall, and the cutter support mechanism and the cutter drive mechanism can be disassembled.

  According to the shield machine of the eleventh aspect, the movable partition is formed in a ring shape, the outer peripheral portion is located on the front side or the rear side of the movable partition, forms the central portion of the partition, and is fixed to the fixed annular member. Since the disk-shaped center-side fixed partition wall is fixed so as to be able to reduce the area of the movable partition wall that rotates integrally with the cutter head, the fixed partition wall and the center-side fixed partition wall facing the cutter head By increasing the area, it is possible to prevent the excavated soil collected in the chamber from remaining around the cutter head and the movable partition wall as much as possible, and therefore the agitating capacity of the excavated soil in the chamber is also increased. The excavated soil in the chamber can be discharged smoothly, and a decrease in excavation capacity can be prevented.

  With the second connection support mechanism, during the digging operation of the shield machine, the movable partition is held in a rotatable state with respect to the central fixed partition while the central fixed partition is fixed to the fixed annular member. When disassembling the machine, the outer peripheral portion of the center side fixed partition wall and the movable partition wall are connected, and the center side fixed partition wall can be supported by the movable partition wall in a state of being released from the fixed annular member. By connecting the outer peripheral side portion of the movable partition wall and the fixed partition wall by the connection support mechanism, and by connecting the outer peripheral side portion of the center side fixed partition wall and the movable partition wall by the second connection support mechanism, It is possible to reliably receive the earth and water pressure and make the cutter support mechanism and the cutter drive mechanism disassembleable.

  According to the shield machine of the twelfth aspect, the tubular member fixed in a penetrating manner to the central portion of the movable partition, the mounting base inserted through the cylindrical member, and the front end of the mounting base are fixed in the chamber. And a first agitator fixing mechanism for releasably fixing the mounting base of the agitator to the fixed annular member. Therefore, the wing part of the agitator can be fixedly placed in the chamber, and the wing part of the agitator can scrape the excavated soil collected in the chamber and remaining between the cutter head and the movable partition wall. In addition, the agitating capacity of the excavated soil in the chamber can be increased, the excavated soil in the chamber can be discharged smoothly, and a decrease in the excavated capacity can be prevented.

  When disassembling the shield machine, the agitator mounting base is fixed to the cylindrical member by the second agitator fixing mechanism, so that the mounting base of the agitator can be supported on the cylindrical member in a state where the fixing base is released from the fixed annular member. Thus, the soil-side pressure on the chamber side can be reliably received, and the cutter support mechanism and the cutter drive mechanism can be disassembled.

  According to the dismantling method of the shield machine according to claim 13, the dismantling method of the shield machine that dismantles the shield machine according to claim 1, wherein the shield machine reaches a predetermined excavation completion position in the connection support step. Then, with the annular seal sealed between the outer peripheral portion of the movable partition and the fixed partition, the outer peripheral portion of the movable partition and the fixed partition are connected by the connection support mechanism, and the cutter mechanism and the movable partition are connected. Is fixedly supported on the front annular member, and then, in the separation step, the cutter support mechanism is separated from the movable partition wall, and the cutter support mechanism is separated from the front annular member, and then in the removal step, the front portion Since the cutter support mechanism is removed to the rear side together with the cutter drive mechanism with respect to the annular member, the same effect as that of the first aspect can be obtained.

  According to the method for disassembling the shield machine of claim 14, it is executed in parallel with at least the steps after the connection support step, injecting ground improvement material in front of the partition wall, and excavating soil in the chamber and in front of the cutter head Since the ground improvement process for improving the ground is provided, the cutter support mechanism and the cutter drive mechanism can be reliably removed and disassembled in parallel with the ground improvement after the shield machine reaches the excavation completion position.

  According to the dismantling method of the shield machine of claim 15, since the final dismantling step of disassembling the front annular member, the movable partition wall and the cutter mechanism is provided after the ground improvement step, the annular member, the movable partition wall and the cutter mechanism Can be surely dismantled.

  The shield machine according to the present invention includes a barrel member, a cutter mechanism having a cutter head disposed on the front end side of the barrel member, a partition wall that partitions the rear end of the chamber inside the front end portion of the barrel member, and an outer peripheral portion on the inner surface of the barrel member A front annular member having a fixed partition that forms an outer peripheral side portion of the partition wall on the front surface, provided at the rear end of the cutter mechanism, and the outer peripheral side portion is positioned on the front side of the fixed partition wall A movable partition that forms at least a part of the part, a cutter support mechanism that is removably attached to the inner peripheral portion of the front annular member in a rear-mounting manner, and supports the cutter mechanism rotatably via the movable partition; Equipped with a cutter support mechanism, a cutter drive mechanism that rotationally drives the cutter mechanism through a movable partition, an annular seal that seals between the outer peripheral portion of the movable partition and the fixed partition, and is fixed during the digging operation of the shield machine A connecting support mechanism that holds the movable partition wall in a rotatable state with respect to the partition wall and connects the outer peripheral side portion of the movable partition wall to the fixed partition wall when the shield machine is disassembled to fix the cutter mechanism to the front annular member. It has.

  The dismantling method of the shield machine according to the present invention is a method of disassembling the shield machine, and after the shield machine reaches a predetermined excavation completion position, the outer peripheral side portion of the movable partition wall and the fixed partition wall with an annular seal In a state where the space between the two is sealed, the connection support mechanism connects the outer peripheral side portion of the movable partition wall and the fixed partition wall, and fixes and supports the cutter mechanism and the movable partition wall to the front annular member. Separating process of separating the cutter support mechanism from the movable partition wall and separating the cutter support mechanism from the front annular member, and then removing the cutter support mechanism from the front annular member together with the cutter driving mechanism to the rear side It has.

First, the shield machine 1 will be described.
As shown in FIGS. 1 to 4, the shield machine 1 includes a trunk member 2, a front annular member 3, a central annular member 4, a cutter mechanism 5, a chamber 6, a partition wall 7, a cutter support mechanism 8, and a cutter drive mechanism. 9, a plurality of first reaction force receivers 10, a plurality of second reaction force receivers 11, an annular seal 12, a seal holding member 13, a connection support mechanism 14, a plurality of shield jacks 15, screw conveyors 16, 17, struts 18, and erectors 19, a perfect circle holding device 20, a rear work deck 21 and the like.

  The body member 2 is formed in a cylindrical shape, and the outer peripheral part of the front annular member 3 is fixed to the inner surface of the front part of the body member 2, and the outer peripheral part of the central annular member 4 is fixed to the inner surface of the central part of the body member 2. Has been. A back-end injection device 22 and a tail seal 23 are provided at the rear end portion of the body member 2. The front annular member 3 is disposed slightly rearward of the front end of the body member 2 and has a relatively large front-rear width and a relatively small inner diameter, and forms a peripheral portion of the partition wall 7 on the front surface portion. A partition wall 25 is provided.

  The plurality of shield jacks 15 are disposed rearwardly at appropriate circumferential intervals along the inner surface of the central portion of the body member 2 and are fixed to the central annular member 4 in a penetrating manner. The screw conveyor 16 is inclined forward and obliquely downward to penetrate the lower portion of the front annular member 3, and the front end thereof faces the lower portion of the chamber 6. The screw conveyor 17 is connected to the rear end of the screw conveyor 16 and extends substantially horizontally rearward.

  A support 18 is fixedly supported on the central annular member 4, an erector 19 is attached to the rear side thereof, and a perfect circle holding device 20 is disposed behind the erector 19. The rear work deck 21 has a front end connected to the support 18 and extends rearward so as to pass inside the erector 19 and the perfect circle holding device 20.

  The cutter mechanism 5 includes a disk-shaped cutter head 30 disposed on the front end side of the body member 2 and a plurality of beams 31 extending rearward from the cutter head 30. The cutter head 30 includes a central head portion 32, a plurality of (four) spokes 33 extending radially outward from the central head portion 32, an intermediate ring 34 connecting the longitudinal central portions of the plurality of spokes 33, and an intermediate ring 34. A plurality of (four) spokes 35 extending radially outward from the outer peripheral ring 36 having the same diameter as the body member 2 are connected to the radially outer ends of the plurality of spokes 33, 35.

  A center cutter 37 is attached to the front part of the central head part 32, a number of cutter bits 38 are attached to the front part of the plurality of spokes 33, 35, and a stirring blade 39 is attached to the rear part of the spokes 33, 35. . Each of the plural (two) spokes 33 is equipped with a copy cutter device 40, and the copy cutter device 40 includes a copy cutter 41 and a spoke 33 provided in a radially outer end portion of the spoke 33. A hydraulic cylinder 42 that is disposed inside and drives the copy cutter 41 to move in and out is provided.

  The chamber 6 is formed inside the front end portion of the body member 2 on the rear side of the cutter head 30, and the rear end of the chamber 6 is partitioned by a partition wall 7. A movable partition wall 26 formed in a disk shape is connected to the rear end portion of the cutter mechanism 5 (the plurality of beams 31), and the outer peripheral side portion of the movable partition wall 26 is on the inner periphery side of the fixed partition wall 25. A central portion of the partition wall 7 is formed on the front side of the portion. That is, the partition wall 7 is composed of the fixed partition wall 25 and the movable partition wall 26.

  From the movable partition wall 26 and the cutter head 30, a ground improvement material such as a water stop material and mortar can be injected in front of the partition wall 7, and the ground improvement material is supplied to the rotating movable partition wall 26 and the cutter head 30. In addition, a rotary joint 27 is provided on the rear side of the central portion of the movable partition wall 26 in order to supply hydraulic pressure to the hydraulic cylinder 42 of the copy cutter device 40 provided in the cutter head 30.

  The cutter support mechanism 8 is a mechanism that rotatably supports the cutter mechanism 5 via the movable partition wall 26. On the rear side of the movable partition wall 26, the cutter support mechanism 8 is fitted in the inner peripheral portion of the front annular member 3 to the rear side. It is installed so that it can be removed. The cutter support mechanism 8 is a fixed annular member 45 that is fitted in the inner peripheral portion of the front annular member 3 and fixed by a plurality of first and second reaction force receivers 11 and 12 so as to be unlockable. And a movable ring member 46 that is rotatably fitted in and is fixed to the movable partition wall 26 so as to be unlockable.

  The fixed annular member 45 has substantially the same front-rear width as the front annular member 3, and an annular flange 45 a projecting radially inward is formed at the rear end portion of the fixed annular member 45. The movable ring member 46 is fitted into the front portion of the fixed annular member 45 and fixed to the movable partition wall 26 with a plurality of fasteners (not shown). These fasteners are operated from the rear side of the movable partition wall 26. The movable ring member 46 can be released from the movable partition wall 26.

  The cutter drive mechanism 9 is a mechanism that rotationally drives the cutter mechanism 5 via the movable partition wall 26 and the movable ring member 46, and is provided in the cutter support mechanism 8. The cutter drive mechanism 9 includes a ring gear 47 coupled to the rear end portion of the movable ring member 46, a plurality of pinions 48 that mesh with the ring gear 47, and a plurality of pinions 48 that are fixed to the fixed annular member 45 and rotate the plurality of pinions 48, respectively. A motor 49 (for example, an electric motor 49) is included.

  The ring gear 47 is disposed between the movable ring member 46 and the annular flange 45a of the fixed annular member 45. The rear end portion of the ring gear 47 is slidably in contact with the annular flange 45a, and gear teeth are formed on the outer periphery of the ring gear 47. Has been. The plurality of hydraulic motors 49 are disposed on the annular flange 45 a of the fixed annular member 45 at an appropriate interval in the circumferential direction and fixed in a forward penetrating manner, and a pinion 48 is attached to the output shaft of each hydraulic motor 49.

  The plurality of first reaction force receivers 10 can receive the reaction force in the rotational direction and the rearward direction transmitted from the cutter mechanism 5 to the fixed annular member 45 via the movable partition wall 26 by the front annular member 3. Are connected to the inner peripheral portion of the front annular member 3 so as to be disengageable, and are provided at appropriate intervals in the circumferential direction.

  As shown in FIG. 4, in each first reaction force receiver 10, the inner circumferential wall 3 a of the front annular member 3 and the outer circumferential wall 45 b of the fixed annular member 45 are arranged so that the cylindrical members 50 and 51 face each other in the radial direction. The connecting pin member 52 is inserted and engaged with the cylindrical members 50, 51, the flange 52 a of the connecting pin member 52 is fastened to the cylindrical member 50 with a bolt 53, and the bolt 53 is fastened from the inside of the front annular member 3. Release and connection pin member 52 can be removed. Note that an annular seal 54 seals between the inner peripheral wall 3 a of the front annular member 3 and the outer peripheral wall 45 b of the fixed annular member 45 on the front side of the plurality of first reaction force receivers 10.

  The plurality of second reaction force receivers 11 are configured so that a rearward reaction force transmitted from the cutter mechanism 5 to the fixed annular member 45 via the movable partition wall 26 can be received by the front annular member 3. It is connected to the inner peripheral part of the front annular member 3 so as to be able to be released from the contact with the part from the rear side, and is provided at appropriate intervals in the circumferential direction.

  As shown in FIG. 4, in each second reaction force receiver 11, the inner peripheral wall 3 a of the front annular member 3 extends rearward from the fixed annular member 45, and a recess 3 b is formed in the inner peripheral portion thereof. A circular arc shaped stopper member 55 is engaged with the recess 3 b of the inner peripheral wall 3 a of the front annular member 3, and is fastened to the inner peripheral wall 3 a of the front annular member 3 with a bolt 56. It is configured to come into contact with the wall 45c from the rear side so that the fastening of the bolt 56 and the removal of the stopper member 55 can be performed from the rear side of the front annular member 3.

  As shown in FIGS. 4 and 5, the annular seal 12 seals between the outer peripheral side portion of the movable partition wall 26 and the inner peripheral side portion of the fixed partition wall 25. The outer peripheral side portion of the movable partition wall 26 and the inner peripheral side portion of the fixed partition wall 25 are opposed to each other with a certain gap, and an annular seal 12 is disposed in the gap, and is fixed to the rear surface of the outer peripheral side portion of the movable partition wall 26. It is held by an annular seal holding member 13. The annular seal 12 is, for example, a resin seal having a main body that abuts against the movable partition wall 26 and a plurality of hook-shaped portions that extend rearward from the main body and abut against the fixed partition wall 25.

  The seal holding member 13 includes an inner peripheral side seal holding member 57 and an outer peripheral side seal holding member 58 that sandwich the annular seal 12 from the inside and outside in the radial direction, and these seal holding members 57 and 58 have a slight gap in the fixed partition wall 25. They are facing each other.

  As shown in FIGS. 1 and 4 to 9, the connection support mechanism 14 holds the movable partition wall 26 in a rotatable state with respect to the fixed partition wall 25 during the digging operation of the shield machine 1 (see FIG. 5). When the shield machine 1 is disassembled, the outer peripheral side portion of the movable partition wall 26 and the inner peripheral side portion of the fixed partition wall 25 are connected, and the cutter mechanism 5 is fixedly supported on the front annular member 3 via the movable partition wall 26 (FIG. 9)).

  The connection support mechanism 14 is arranged on the outer peripheral side portion of the movable partition wall 26 at appropriate intervals (equal intervals) in the circumferential direction and is formed in a plurality of (for example, 30 to 40) screw hole portions 60 that are formed to be open in the rearward direction. And a plurality of (for example, 30 to 40) that are arranged in the fixed partition wall 25 at appropriate circumferential intervals (equal intervals) corresponding to the arrangement of the plurality of screw hole portions 60 and are inserted in the fixed partition wall 25 in a penetrating manner. As shown in FIGS. 5 and 6, the bolt member 61 is held in a non-projecting manner forward with respect to the fixed partition wall 25, and as shown in FIGS. 8 and 9, the fixed partition wall 25. And a plurality of bolt members 61 that are operated from the rear side and project forward and screwed into the screw holes 60.

  The plurality of screw hole portions 60 are formed at an appropriate depth in a portion of the outer peripheral side portion of the movable partition wall 26 located in front of the inner peripheral seal holding member 57. A plurality of bolt through holes 62 communicating with the plurality of screw holes 60 are formed, and the fixed partition wall 25 has a plurality of diameters larger than the bolt member 61 (for example, a diameter about 1.5 times that of the bolt member 61). A plurality of partition wall through-hole portions 63 through which the bolt members 61 are inserted are formed, and most of the partition wall through-hole portions 63 excluding the front end portion are formed in the partition wall screw hole portions 63a.

  The bolt member 61 has a front screw portion 61a that is screwed into the screw hole 60 at the front end portion, a rear screw portion 61b formed at the rear end portion, and a tool operation portion on the rear end side of the rear screw portion 61b. The bolt member 61 is formed such that the rear screw portion 61b is positioned behind the fixed partition wall 25 in a state where the 61c is formed and the front screw portion 61a is completely screwed into the screw hole portion 60. .

  The connection support mechanism 14 includes a fixing nut member 64 in which each bolt member 61 is slidably inserted in the front-rear direction and is screwed into the partition wall screw hole 63a so as to be inserted into the partition wall through hole 63 of the fixed partition wall 25. As shown in FIG. 5, the fixed partition 25 is held in a non-projecting manner forward, and as shown in FIGS. 6 to 9, it is operated from the rear side of the fixed partition 25 and projects forward. A fixing nut member 64 that is pressed against the circumferential seal holding member 57 is provided.

  The fixed nut member 64 is held by the fixed partition wall 25 so that the front end surface thereof is substantially the same as the front end surface of the inner peripheral side portion of the fixed partition wall 25. In this state, the fixed nut member 64 is rearward of the fixed partition wall 25. A tool operation portion 64 a is formed at the rear end portion of the fixed nut member 64. The space between the front end portion of the partition wall through-hole portion 63 of the fixed partition wall 25 and the fixed nut member 64 is sealed by the seal member 65, and the rear portion of the fixed nut member 64 and the front screw portion 61 a of the bolt member 61 The space between the two is sealed with a seal member 66.

  Further, the connection support mechanism 14 is a fastening nut member 67 that is screwed into the rear screw portion 61b of each bolt member 61 in an outer fitting manner on the rear side of the fixed partition wall 25, and as shown in FIG. The front screw portion 61a of 61 is completely screwed into the screw hole portion 60, and the fixing nut member 64 is pressed against the inner peripheral side seal holding member 57, and is operated from the rear side of the fixed partition wall 25. A clamping nut member 67 that fastens the movable partition wall 26 to the fixed partition wall 25 via the bolt member 61 by holding the fixed nut member 64 between the inner periphery side seal holding member 57 is provided.

  A receiving plate 68 is disposed behind each bolt member 61, and is connected to the fixed partition wall 25 by a plurality of rods 68a. A pressing bolt 69 is screwed into the receiving plate 68 in a front-and-rear manner. The bolt member 61 that receives the soil water pressure on the chamber 6 side can be supported from the rear side by the pushing bolt 69, the receiving plate 68, and the plurality of rods 68a. .

Next, a method for dismantling the shield machine 1 will be described.
As shown in FIG. 10, after the shield machine 1 reaches a predetermined excavation completion position in the ground, the rear work deck 21, the screw conveyors 16, 17, A first step of sequentially disassembling the device 20, the erector 19, the support column 18 and the like, and then a second step of dismantling and removing the cutter support mechanism 8 and the cutter drive mechanism 9 as shown in FIGS. I have.

  Further, in this dismantling method of the shield machine 1, a ground improvement material such as a water stop material or mortar is injected in front of the partition wall 7 to improve the excavated soil in the chamber 6 and the ground in front of the cutter head 30. 3 steps (ground improvement step), and the third step is performed in parallel with the first and second steps, and after the second and third steps, the central annular member 4 and a plurality of The shield jack 5, the front annular member 3, the movable partition wall 26, the cutter mechanism 5 and the like are sequentially disassembled and removed.

  Then, in the second step, the outer peripheral side portion of the movable partition wall 26 and the fixed partition wall 25 are fixed by the connection support mechanism 14 in a state where the outer peripheral side portion of the movable partition wall 26 and the fixed partition wall 25 are sealed by the annular seal 12. And connecting and supporting the cutter mechanism 5 and the movable partition wall 26 to the front annular member 3. Next, the cutter support mechanism 5 is separated from the movable partition wall 26, and the cutter is separated from the front annular member 3. A separation step of separating the support mechanism 8 and a removal step of removing the cutter support mechanism 8 from the front annular member 3 together with the cutter drive mechanism 9 are provided.

  In the connection support step, first, as shown in FIG. 5, the cutter mechanism 5 is rotated by the cutter drive mechanism 9 to perform alignment so that the plurality of screw hole portions 60 are positioned in front of the plurality of bolt members 61. . This position detection may be performed by providing a detection device having a switch or a sensor on the front annular member 3 or the fixed annular member 45 and the movable partition wall 26 or the movable ring member 46, or by providing a pre-marked index. You may go.

  Next, as shown in FIG. 6, the tool operation portion 64 a of the fixed nut member 64 is operated with a tool, the fixed nut member 64 is rotated and moved forward, and is pressed by the inner peripheral side seal holding member 57. Thus, the gap between the fixed nut member 64 and the inner peripheral side seal holding member 57 is eliminated, and the inside of the fixed nut member 64 is connected to the bolt through hole 62 and the screw hole portion 60.

  Next, as shown in FIG. 7, the push bolt 69 is operated with a tool to rotate the push bolt 69 and move it forward, thereby pushing the bolt member 61 forward and the bolt through hole 62. And the front end of the bolt member 61 is pressed against the rear end of the screw hole 60. Next, as shown in FIG. 8, the tool operation portion 61 c of the bolt member 61 is operated with a tool, the bolt member 61 is rotated and moved forward, and the front screw portion 61 a is screwed into the screw hole portion 60. Let

  Next, as shown in FIG. 9, after the bolt member 61 is completely screwed into the screw hole 60, the fastening nut member 67 is rotated and moved forward, and is pressed against the rear end portion of the fixing nut member 64. Thus, the movable partition wall 26 is firmly fastened to the fixed partition wall 25 via the inner peripheral side seal holding member 57, the bolt member 61, the fixed nut member 64, and the fastening nut member 67. The above-described operation is performed on all the rod members 61, the push bolts 69, the fixing nut members 64, and the fastening nut members 67 of the connection support mechanism 14 to complete the connection support process.

  In the separation step, the cutter support mechanism 5 is separated from the movable partition wall 26 by unfastening a plurality of fasteners that fasten the movable partition wall 26 to the movable ring member 46, and in the plurality of first reaction force receivers 10, Each of the bolts 53 is removed and the connecting pin member 52 is pulled out from the cylindrical members 50 and 51, and the bolts 56 are removed from the plurality of second reaction force receivers 11, and the stopper member 55 is attached to the front annular member 3. The cutter support mechanism 8 is separated from the front annular member 3 by being removed from the inner peripheral wall 3a.

  In the removal process, as shown in FIG. 10, a plurality of extraction brackets 70, a plurality of extraction jacks 71, rails 72, and a transport carriage 73 are used to remove the cutter support mechanism 8 together with the cutter drive mechanism 9 to the rear side. Preparation of the drawing bracket 70, the drawing jack 71, the rail 72, and the conveyance carriage 73 can be performed in parallel with the connection support process and the separation process.

  The plurality of extraction brackets 70 are attached to the annular flange 45a of the fixed annular member 45 so as to project outward in the radial direction, and the rear end portions of the plurality of extraction jacks 71 are connected and held by the plurality of extraction brackets 70, respectively. The rail 72 is laid so as to extend rearward from the immediately rear side of the front annular member 3, and a mechanism holding structure that holds the cutter support mechanism 8 and the cutter drive mechanism 9 is provided on the transport carriage 73 placed on the rail 72. 74 is provided.

  In a state where the transport carriage 73 is positioned just behind the front annular member 3, the cutter support mechanism 8 is pulled out together with the cutter drive mechanism 9, but in this case, the extraction jack 71 is driven to extend, The pull-out bracket 70 is pushed rearward with respect to the front surface portion of the front annular member 3, and then the pull-out jack 71 is driven to retract, so that the front ring member 3 is interposed between the front surface portion and the pull-out jack 71. A power transmission member 75 is added to the generated gap, and the advancement / retraction of the pull-out jack 71 and the power transmission member 75 are repeated, and the cutter support mechanism 8 is moved rearward together with the cutter drive mechanism 9 as shown in FIG. Pull out and remove.

  The cutter support mechanism 8 and the cutter drive mechanism 9 pulled out to the rear side are placed on the transport carriage 73 and held by the mechanism holding structure 74. In this state, as shown in FIG. The cutter support mechanism 8 and the cutter drive mechanism 9 are conveyed rearward using the propulsion jack 76, and the cutter support mechanism 8 and the cutter drive mechanism 9 are reused. .

The effects of the shield machine 1 and the disassembly method described above will be described.
The cutter mechanism 5 is rotatably supported by the cutter support mechanism 8 via a movable partition wall 26 provided at the rear end portion thereof, and is rotationally driven by the cutter drive mechanism 9 via the movable partition wall 26. Is positioned on the front side of the fixed partition wall 25, and the space between the outer peripheral side portion of the movable partition wall 26 and the fixed partition wall 25 is sealed with the annular seal 12, and the connecting support mechanism 14 is movable during the digging operation of the shield machine 1. The outer peripheral side portion of the partition wall 26 and the fixed partition wall 25 are disconnected, and the movable partition wall 26 is held in a rotatable state with respect to the fixed partition wall 25. When the shield machine 1 is disassembled, the movable partition wall 26 is moved by the annular seal 12. The outer peripheral side portion of the movable partition wall 26 and the fixed partition 25 are connected to each other in a state where the outer peripheral side portion and the fixed partition 25 are sealed, and the cutter mechanism 5 is connected to the front annular member 3 via the movable partition wall 26. It can be fixed support.

  Accordingly, the cutter support mechanism 8 is separated from the movable partition wall 26 in a state where the cutter mechanism 5 is fixedly supported on the front annular member 3 by the connection support mechanism 14, and the one that supports the cutter mechanism 5 is separated from the cutter support mechanism 8. The cutter support mechanism 8 can be separated from the front annular member 3 and the cutter support mechanism 8 can be removed together with the cutter drive mechanism 9 to the rear side and disassembled. At that time, the soil water pressure on the chamber 6 side is reliably received by the partition 7 including the movable partition 26 in a state where the excavated soil in the chamber 6 and the ground in front of the cutter head 30 are not improved (ground improvement). In addition, since the space between the outer peripheral side of the movable partition wall 26 and the fixed partition wall 25 is sealed by the annular seal 12, earth and sand, muddy water, etc. in the chamber 6 are more than in the partition wall 7 in the body member 2. It can be prevented from entering the side.

  In other words, after the shield machine 1 reaches the excavation completion position, the cutter support mechanism 8 and the cutter drive mechanism 9 can be detached and disassembled in parallel with the ground improvement, and this disassembly is performed easily, reliably and safely. After the ground improvement is completed, the front annular member 3, the movable partition wall 26, the cutter mechanism 5 and the like can be smoothly disassembled, so the time required for disassembling the shield machine 1, that is, the entire tunnel construction The construction period can be shortened as much as possible.

  Since the movable partition wall 26 is formed in a disc shape, the structure of the partition wall 7 is simplified, and when the shield machine 1 is disassembled, only the outer peripheral side portion of the movable partition wall 26 and the fixed partition wall 25 are connected by the connection support mechanism 14. The soil water pressure on the chamber 6 side can be reliably received by the partition wall 7 so that the cutter support mechanism 8 and the cutter drive mechanism 9 can be disassembled.

  Next, Embodiments 2 and 3 in which Embodiment 1 is partially changed will be described. However, basically the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  As shown in FIGS. 13 to 15, in the shield machine 1 </ b> A according to the second embodiment, the partition wall 7 </ b> A includes a fixed partition wall 25, a movable partition wall 80 formed in a ring shape, and a center side fixed member formed in a disk shape. Partition wall 81. The movable partition wall 80 is provided to be connected to the rear end portion of the cutter mechanism 5 (the plurality of beams 31). The outer peripheral side portion of the movable partition wall 80 is located on the front side of the inner peripheral side portion of the fixed partition wall 25, and the first embodiment. Similarly, the annular seal 12 seals between the outer peripheral portion of the movable partition wall 80 and the fixed partition wall 25, and the connection support mechanism 14 causes the movable partition wall 80 to move relative to the fixed partition wall 25 during the digging operation of the shield machine 1. While being held in a rotatable state, the outer peripheral side portion of the movable partition 80 and the fixed partition 25 are connected when the shield machine 1 is disassembled.

  The movable partition wall 80 has an inner diameter that is about 1/3 that of the body member 2, and the center-side fixed partition wall 81 is positioned on the front side of the inner periphery side portion of the movable partition wall 80, and the center-side portion of the partition wall 7 </ b> A. And is fixed to the fixed annular member 45 through the fixing ring member 82 so that the fixing can be released. The fixed ring member 82 has a front large-diameter ring portion 82a and a rear small-diameter ring portion 82b. The front large-diameter ring portion 82a and the rear small-diameter ring portion 82b are slightly attached to the movable ring member 46 and the ring gear 47, respectively. It is inserted with a big gap.

  The front end portion of the fixed ring member 82 is fixed to the center-side fixed partition wall 81 by a plurality of fasteners (not shown), and the rear end portion of the fixed ring member 82 is fixed to the fixed annular member 45 by a plurality of fasteners (not shown). Has been. The space between the movable ring member 46 and the front large-diameter ring portion 82a and the space between the movable ring member 46 and the fixed annular member 45 are sealed by annular seal members 83 and 84, respectively. However, these sealing members 83 and 84 can be omitted. In the first embodiment, the gap between the movable ring member 46 and the fixed annular member 45 may be sealed with an annular seal member.

  The shield machine 1A includes an annular seal 85 that seals between the outer peripheral side portion of the center-side fixed partition wall 81 and the inner peripheral side portion of the movable partition wall 80, and a center-side fixed member during the excavation operation of the shield machine 1A. While the partition wall 81 is fixed to the fixed annular member 45, the movable partition wall 80 is held in a rotatable state with respect to the center side fixed partition wall 81, and when the shield machine 1A is disassembled, the outer peripheral side of the center side fixed partition wall 81 A second connecting and supporting mechanism 86 is provided that can support the movable partition wall 80 in a state where the center side fixed partition wall 81 is unfixed from the fixed annular member 45 by connecting the portion and the inner peripheral side portion of the movable partition wall 80. .

  As in the first embodiment, the annular seal 85 is held by the seal holding member 87, and the seal holding member 87 has an inner peripheral side seal holding member fixed to the rear surface of the outer peripheral side portion of the center side fixed partition wall 81 and the outer periphery. It consists of a side seal holding member. The second connection support mechanism 86 has the same structure as that of the connection support mechanism 14, and a detailed description thereof will be omitted.

  According to this shield machine 1A, the movable partition wall 80 is formed in a ring shape, the outer peripheral side portion is located on the front side of the movable partition wall 80, the center side portion of the partition wall 7A is formed, and the fixed annular member 45 can be fixed and released. Since the disk-shaped center-side fixed partition wall 81 is fixed to the cutter head 30, the area of the movable partition wall 80 rotating integrally with the cutter head 30 is reduced, and the fixed partition wall 25 and the center facing the cutter head 30 are reduced. By increasing the area of the side fixed partition wall 81, it is possible to prevent the excavated soil collected in the chamber 6 from remaining between the cutter head 30 and the movable partition wall 80 as much as possible. The agitation capacity of the excavated soil is also increased, the excavated soil in the chamber 6 can be discharged smoothly, and the excavation capacity can be prevented from being lowered.

  A state in which the movable partition 80 can be rotated with respect to the center-side fixed partition 81 while the center-side fixed partition 81 is fixed to the fixed annular member 45 by the second connection support mechanism 86 during the digging operation of the shield machine 1A. And when the shield machine 1A is disassembled, the outer peripheral side portion of the center side fixed partition wall 81 and the movable partition wall 80 are connected, and the center side fixed partition wall 81 is unfixed from the fixed annular member 45 and the movable partition wall 80 is released. Therefore, when the shield machine 1A is disassembled, the connection support mechanism 14 connects the outer peripheral side portion of the movable partition wall 80 and the fixed partition wall 25, and the second connection support mechanism 86 connects the center side fixed partition wall 81. By connecting the outer peripheral portion and the movable partition wall 80, the soil water pressure on the chamber 6 side is reliably received by the partition wall 7A, and the cutter support mechanism 8 and the cutter drive mechanism 9 are disengaged. It is possible to enable state.

  When disassembling the shield machine 1A, the fixing ring member 82 is released from the center side fixed partition wall 81, and the fixing ring member 82 is removed to the rear side together with the cutter support mechanism 8 and the cutter driving mechanism 9. Can do. The center-side fixed partition 81 may be configured such that the outer peripheral side portion is located behind the inner peripheral side portion of the movable partition 80.

  As shown in FIGS. 16 to 18, the shield machine 1B according to the third embodiment includes a cylindrical member 90 fixed in a penetrating manner at the central portion of the movable partition wall 26B, an attachment base 91a inserted through the cylindrical member 90, and an attachment. An agitator 91 having a wing 91b fixed to the front end of the base 91a and disposed in the chamber 6, a seal member 92 for sealing between the cylindrical member 90 and the mounting base 91a of the agitator 91, and the agitator 91 The first agitator fixing mechanism 93 that fixes the mounting base 91 a to the fixed annular member 45 so as to be unreleasable, and the mounting base 91 a of the agitator 91 is fixed to the cylindrical member 90, and the mounting base 91 a of the agitator 91 is removed from the fixed annular member 45. A second agitator fixing mechanism 94 that can be supported by the cylindrical member 90 in a state where the fixing is released is provided.

  The cylindrical member 90 is fixed to the movable partition wall 26B so as to protrude rearward, the mounting base 91a of the agitator 91 is formed in a cylindrical shape and slightly protrudes rearward from the cylindrical member 90, and the rotary joint 95 is inserted into the mounting base 91a. The rotary joint 95 is also inserted into the wing portion 91 b of the agitator 91, and the front end portion thereof is connected to the cutter head 30.

  In the first agitator fixing mechanism 93, a flange 93a is provided at the rear end portion of the mounting base portion 91a of the agitator 91, and the front end portion of the tapered connecting ring member 93b extending rearward is connected to the flange 93a. ) And the rear end portion of the connecting ring member 93b is fixed to the fixed annular member 45 by a plurality of fasteners (not shown), and is fixed by the first agitator fixing mechanism 93 during the excavation operation of the shield machine 1B. Is maintained, and when the shield machine 1B is disassembled, the fixing by the first agitator fixing mechanism 93 is released.

  In the second agitator fixing mechanism 94, a plurality of L-shaped fixtures 94a are provided, and an engagement recess 94b is formed in the front portion of the flange 93a of the mounting base 91a of the agitator 91 so that these L-shaped fixtures 94a can be engaged. When the shield machine 1B is digging, the second agitator fixing mechanism 94 is released, and when the shield machine 1B is disassembled, the second agitator fixing mechanism 94 is fixed.

  Regarding the fixing by the second agitator fixing mechanism 94, first, the mounting base 91a of the agitator 91 is fixed and positioned with respect to the cylindrical member 90 by a plurality of fasteners (not shown) from the radial direction, and then a plurality of L-shaped fixings are performed. The tool 94a is fixed to the outer peripheral surface of the cylindrical member 90 so as to protrude rearward, and the protrusion 94a1 protruding rearward and radially inward of each L-shaped fixture 94a is engaged with the engagement recess 94b of the mounting base 91a of the agitator 91. Is done.

  According to the shield machine 1B, the wing portion 91b of the agitator 91 can be fixedly disposed in the chamber 6, and the wing portion 91b of the agitator 91 is recovered in the chamber 6 and is connected to the cutter head 30 and the movable partition wall 26B. The excavated soil remaining in between can be scraped off, the agitating capacity of the excavated soil in the chamber 6 can be increased, the excavated soil in the chamber 6 can be discharged smoothly, and a decrease in the excavated capacity can be prevented.

  When the shield machine 1B is disassembled, the second agitator fixing mechanism 94 fixes the mounting base 91a of the agitator 91 to the cylindrical member 90 by the second agitator fixing mechanism 94 so that the mounting base 91a of the agitator 91 is unfixed from the fixed annular member 45. It can be supported by the member 90, that is, the soil water pressure on the chamber 6 side can be reliably received by the partition wall 7, and the cutter support mechanism 8 and the cutter drive mechanism 9 can be disassembled. When disassembling the shield machine 1B, the front end portion of the connecting ring member 93b is released from the cylindrical member 90 so that the connecting ring member 93b is moved to the rear side together with the cutter support mechanism 8 and the cutter driving mechanism 9. Can be removed.

  In addition, in the range which does not deviate from the meaning of the present invention, various modifications can be added and implemented. For the shield machine and the dismantling method of the present invention, the muddy water shield machine, earth pressure shield machine It can be applied to various shield machines and their dismantling methods.

It is sectional drawing of the shield machine of Example 1. FIG. It is a front view of a shield machine. It is a rear view of a shield machine. It is sectional drawing of the principal part containing the connection support mechanism of a shield machine. It is sectional drawing at the time of alignment of a connection support mechanism. It is sectional drawing at the time of fixed nut member operation of a connection support mechanism. It is sectional drawing at the time of the pushing bolt operation of a connection support mechanism. It is sectional drawing at the time of the bolt member operation of a connection support mechanism. It is sectional drawing at the time of the fastening nut member operation of a connection support mechanism. It is sectional drawing at the time of disassembly preparations, such as a cutter support mechanism of a shield machine. It is sectional drawing at the time of the disassembly of the cutter support mechanism etc. of a shield machine. It is sectional drawing at the time of dismantling conveyance, such as a cutter drive mechanism. It is sectional drawing of the shield machine of Example 2. FIG. It is a front view of a movable partition and a center side fixed partition. It is sectional drawing of the principal part containing the connection support mechanism of a shield machine. 6 is a front view of a movable partition wall in Example 3. FIG. It is sectional drawing of the principal part containing the connection support mechanism of a shield machine. It is a principal part enlarged view of FIG.

Explanation of symbols

1, 1A, 1B Shield machine 2 Body member 3 Front annular member 5 Cutter mechanism 6 Chamber 7, 7A Bulkhead 8 Cutter support mechanism 9 Cutter drive mechanism 10 First reaction force receiver 11 Second reaction force receiver 12, 85 Annular seal 13 Seal holding member 14 Connection support mechanism 25 Fixed partition wall 26, 26B, 80 Movable partition wall 30 Cutter head 45 Fixed annular member 46 Movable ring member 47 Ring gear 48 Pinion 49 Motor 57 Inner circumferential side seal retaining member 58 Outer circumferential side seal retaining member 60 Screw Hole 61 Bolt member 62 Bolt through hole 64 Fixing nut member 67 Fastening nut member 86 Second connection support mechanism 90 Tube member 91 Agitator 91a Mounting base 91b Wing 92 Seal member 93 First agitator fixing mechanism 94 Second agitator fixing mechanism

Claims (15)

In a shield machine having a trunk member, a cutter mechanism having a cutter head disposed on the front end side of the trunk member, and a partition wall that partitions the rear end of the chamber inside the front end portion of the trunk member,
A front annular member having a fixed partition that is fixed to the inner surface of the body member and has an outer peripheral side portion of the partition on the front surface;
A movable partition wall provided at a rear end portion of the cutter mechanism, the outer peripheral side portion being positioned on the front side of the fixed partition wall and forming at least a part of a central side portion of the partition wall;
A cutter support mechanism, which is detachably attached to the inner peripheral portion of the front annular member so as to be removable to the rear side, and supports the cutter mechanism rotatably via a movable partition;
A cutter drive mechanism that is equipped with the cutter support mechanism and that rotates the cutter mechanism via a movable partition,
An annular seal that seals between the outer peripheral side portion of the movable partition and the fixed partition;
During the excavation operation of the shield machine, the movable partition is held in a rotatable state with respect to the fixed partition, and when the shield machine is disassembled, the outer peripheral side portion of the movable partition and the fixed partition are connected to move the cutter mechanism to the front. A connection support mechanism fixedly supported on the annular member;
A shield machine characterized by having The cutter support mechanism includes a fixed annular member that is fitted in the inner peripheral portion of the front annular member and is fixed so as to be unlockable. The cutter support mechanism is rotatably supported by the fixed annular member and can be fixedly released to the movable partition wall. A fixed movable ring member,
The cutter driving mechanism includes a ring gear coupled to the rear end portion of the movable ring member, a plurality of pinions that mesh with the ring gear, and a plurality of motors that are fixed to the fixed annular member and rotate the plurality of pinions, respectively. The shield machine according to claim 1.   The outer circumferential portion of the fixed annular member can be received by the front annular member so that the reaction force in the rotational direction and the rearward direction transmitted from the cutter mechanism to the stationary annular member via the movable ring member of the cutter support mechanism can be received by the front annular member. 3. The shield machine according to claim 2, wherein a plurality of first reaction force receivers that are releasably connected to the inner peripheral portion are provided at appropriate intervals in the circumferential direction.   The front ring member abuts against the rear end of the fixed annular member from the rear side so that a backward reaction force transmitted from the cutter mechanism to the fixed annular member via the movable ring member of the cutter support mechanism can be received by the front annular member. 4. The shield machine according to claim 3, wherein a plurality of second reaction force receivers that are releasably connected to the inner peripheral portion of the annular member are provided at appropriate intervals in the circumferential direction. The connection support mechanism is
A plurality of screw holes formed on the outer peripheral side portion of the movable partition wall at appropriate intervals in the circumferential direction and formed in a rearward open shape;
A plurality of bolt members arranged at appropriate intervals in the circumferential direction corresponding to the arrangement of a plurality of screw hole portions in the fixed partition, and inserted into the fixed partition in a penetrating manner, each forward with respect to the fixed partition A plurality of bolt members that are held in a non-protruding shape and are operated from the rear side of the fixed partition wall and project forward and screwed into the screw holes;
The shield machine according to any one of claims 1 to 4, wherein the shield machine is provided. The connection support mechanism is
A fastening nut member that is screwed onto the bolt members on the rear side of the fixed partition wall so as to be externally fitted, and is movable by being operated from the rear side of the fixed partition wall with the bolt members screwed into the screw holes. The shield machine according to claim 5, further comprising a fastening nut member for fastening the partition wall to the fixed partition wall via a bolt member. An annular seal holding member that is fixed to the rear surface of the movable partition wall and holds an annular seal;
The shield machine according to claim 6, wherein a plurality of bolt through holes communicating with the plurality of screw hole portions are formed in the seal holding member. The seal holding member is composed of an inner peripheral side seal holding member and an outer peripheral side seal holding member that sandwich the annular seal from inside and outside in the radial direction,
The shield machine according to claim 7, wherein the plurality of bolt through holes are formed in an inner peripheral side seal holding member. The connection support mechanism is
A fixing nut member into which the bolt members are inserted and screwed into the fixed partition so as to be inserted into the fixed partition. The fixed nut member is held forward by the fixed partition and is operated from the rear side of the fixed partition and protrudes forward. The shield machine according to claim 7, further comprising a fixing nut member pressed against the seal holding member.   The shield machine according to claim 5, wherein the movable partition wall is formed in a disc shape. The movable partition is formed in a ring shape,
A disc-shaped center-side fixed partition wall that is positioned on the front side or the rear side of the movable partition wall to form the center-side portion of the partition wall and is fixed to the fixed annular member so as to be unlockable;
During the excavation operation of the shield machine, the central fixed partition is fixed to the fixed annular member, the movable partition is held in a rotatable state with respect to the central fixed partition, and when the shield machine is disassembled, the center is fixed. A second connection support mechanism that connects the outer peripheral side portion of the side fixed partition wall and the movable partition wall and can be supported by the movable partition wall in a state where the center side fixed partition wall is unfixed from the fixed annular member;
The shield machine according to claim 2, comprising: A cylindrical member fixed in a penetrating manner to the central portion of the movable partition;
An agitator having an attachment base inserted through the tubular member and a wing portion fixed in the front end of the attachment base and disposed in the chamber;
A seal member that seals between the tubular member and the mounting base of the agitator;
A first agitator fixing mechanism for fixing the mounting base of the agitator to the fixed annular member so as to be unreleasable;
A second agitator fixing mechanism capable of supporting the cylindrical member in a state in which the mounting base of the agitator is fixed to the cylindrical member and the fixing base of the agitator is released from the fixed annular member;
The shield machine according to claim 10, comprising: A method of dismantling a shield machine for disassembling the shield machine of claim 1,
After the shield machine has reached a predetermined excavation completion position, the outer peripheral side portion of the movable partition wall is fixed to the outer peripheral side portion of the movable partition wall by the connection support mechanism in a state where the outer peripheral side portion of the movable partition wall and the fixed partition wall are sealed with an annular seal. A connecting support step of connecting the partition wall and fixing and supporting the cutter mechanism and the movable partition wall to the front annular member;
Next, separating the cutter support mechanism from the movable partition wall, and separating the cutter support mechanism from the front annular member;
Next, a removal step of removing the cutter support mechanism to the rear side together with the cutter drive mechanism with respect to the front annular member,
A method for dismantling a shield machine, comprising:   It was executed in parallel with at least the steps after the connection support step, and was provided with a ground improvement step for injecting a ground improvement material in front of the partition wall and improving ground in front of the excavated soil and cutter head in the chamber. The method for disassembling a shield machine according to claim 13.   The method for disassembling a shield machine according to claim 14, further comprising a final disassembly step of disassembling the front annular member, the movable partition wall, and the cutter mechanism after the ground improvement step.