JP5497585B2 - Segment shape holding device in shield tunnel - Google Patents

Description

  The present invention relates to a segment shape holding device in a shield tunnel, and more particularly to a segment shape holding device in a shield tunnel that holds the shape of a segment constructed at a rear position of a shield machine during construction of the shield tunnel.

  When constructing a shield tunnel, excavation is performed while assembling segments along the inner surface of the excavated tunnel. In addition, backfilling is performed between the segment assembled on the inner surface of the tunnel and the natural ground to prevent the deformation of the surrounding ground and to improve the water stoppage of the tunnel.

  Further, when backfill injection is performed, it is required to prevent the deformation of the segment due to the pressure of backfill injection and the weight of the segment. For this reason, the segment shape holding | maintenance apparatus which hold | maintains a segment shape by pressing the existing segment in the back of a shield machine from the inside is known (for example, refer patent document 1). The segment shape holding device includes an upper elastic member and a lower elastic member, and applies a pressing force to the segment pressing member by the upper elastic member and the lower elastic member, and the segment pressing member presses the segment. Thus, the segment shape is maintained.

  Further, as a shield machine equipped with this type of segment shape holding device, a shield machine equipped with a plurality of segment pressing mechanisms is also known (see, for example, Patent Document 2). The shield machine includes a plurality of segment pressing mechanisms, and an erector used for assembling the segments is attached to the segment pressing mechanisms. Here, at the time of assembling the segments by the elector, the segment pressing mechanism that holds the erector is sequentially moved, and the segment pressing mechanism that releases the erector is sequentially advanced. In this way, the segment pressing mechanism can be advanced while assembling the segment with the erector.

JP-A-6-73998 JP-A-4-153498

  Here, in the segment shape holding device disclosed in Patent Document 1, when the excavation by the shield machine proceeds, the segment shape holding device is also moved forward with the progress of the excavation. However, in the segment shape holding device disclosed in Patent Document 1, the segment shape is held by the segment pressing member. For this reason, in order to advance the segment shape holding device, since the segment shape holding has to be once released, there is a problem in that it may not be possible to advance stably.

  Further, the segment pressing mechanism in the shield machine disclosed in Patent Document 2 is intended to advance the segment pressing mechanism while the assembly operation of the segments by the erector is performed while holding the erector. For this reason, there has been no attempt to provide more segment pressing mechanisms to hold the segment shape in a wide range. Further, when the segment pressing mechanism is advanced, the existing segment is advanced while being pressed by the extended segment pressing mechanism. For this reason, there was a problem that the segment pressing mechanism (shaped jack) could not be moved forward stably.

  Therefore, an object of the present invention is to provide a segment shape holding device in a shield tunnel that can hold a segment shape in a wide range and can stably advance a shape-keeping jack.

Segment-shaped holding device in shield tunnel according to the present invention which has solved the above problems, a frame to follow the movement in the shield machine by a shield machine for applying a shield tunnel advances, is mounted to the frame, the shield tunnel A rail extending along the excavation direction, and a preceding shape retaining jack group having a plurality of preceding shape retaining jacks that are extendable in the radial direction of the shield tunnel and that retain the shape of the segment constructed in the shield tunnel at the time of extension; A follow-up type jack that is spaced apart in the tunnel direction of the shield tunnel and can be expanded and contracted in the radial direction of the shield tunnel, and retains the shape of the segment installed in the shield tunnel when extended. A group of following jacking jacks, and a group of preceding jacking and jacking Yakki group is capable forward movement along the rail, the shape retention jack group moving means for moving relative excavation direction of a prior shape retention jack unit and a trailing shape retention jack group shield tunnel It is characterized by providing.
In addition, the segment shape holding device in the shield tunnel according to the present invention includes a cart that moves following the shield machine when the shield machine that constructs the shield tunnel moves forward, and is supported by the carriage in the direction of the shield tunnel. A rail that extends along the front, a pre-shaped retaining jack group that has a plurality of pre-shaped retaining jacks that can expand and contract in the radial direction of the shield tunnel and retain the shape of the segment constructed in the shield tunnel when stretched; A plurality of follow-up type jacks that are spaced apart from the jack in the shield tunnel digging direction, can be expanded and contracted in the radial direction of the shield tunnel, and retain the shape of the segment constructed in the shield tunnel when extended. A rear-holding jack group, and a preceding-holding jack group and a rear-holding jack group It is possible to move forward along the rail, and has a shape retaining jack group moving means for moving the preceding shape retaining jack group and the following shape retaining jack group relative to the shield tunnel digging direction. And

  The segment shape holding device according to the present invention includes a preceding shape retaining jack group having a plurality of preceding shape retaining jacks and a trailing shape retaining jack group having a plurality of following shape retaining jacks. For this reason, in holding the segment shape, the segment shape can be held in a wide range. In addition, the preceding shape retaining jack group and the following shape retaining jack group can be moved forward along the rail. For this reason, when the shape retaining jack group is advanced, the shape retaining jack can be stably advanced.

  Here, the gantry may be a single type or may be supported by a plurality of carts arranged in the direction of excavation of the shield tunnel.

  Thus, the gantry can be easily followed by the shield machine by being supported by the carriage. In addition, since the gantry is supported by a plurality of carts arranged in the direction of tunnel tunnel excavation, the rails are kept straight by tilting the carts even when the shield tunnel is uneven. Can be easier.

  Further, at least one of the plurality of preceding shape retaining jacks in the preceding shape retaining jack group and the plurality of succeeding shape retaining jacks in the following retaining shape jack group is configured to be extended and contracted in synchronization through a common hydraulic circuit. be able to.

  In this way, the preceding shape retaining jack group or the following shape retaining jack group is expanded and contracted in synchronization through a common hydraulic circuit, so that the expansion and contraction of the preceding shape retaining jack group or the following shape retaining jack group can be easily synchronized. be able to.

  Furthermore, the structure is constructed in the rear position of the shield machine and can be provided between the shield machine and the structure.

  In the shield tunnel, after the structure is constructed, the segment shape is maintained by the constructed structure. In the present invention, the segment shape holding device is disposed between the shield machine and the structure, so that the segment shape can be maintained between the shield machine and the structure that is not yet held by the structure. This can be suitably achieved.

  Further, the plurality of preceding shape retaining jacks and the plurality of following shape retaining jacks are fixedly connected by connecting members, respectively, and the shape retaining jack group moving means includes a part of the preceding shape retaining jack group and the following retaining shape. By moving a part of the shape jack relatively with respect to the direction of the shield tunnel excavation, the preceding shape retaining jack group and the following shape retaining jack can be moved as a whole.

  In the present invention, by moving a part of the preceding shape retaining jack group and a part of the following shape retaining jack relative to the direction of the shield tunnel, the preceding shape retaining jack group and the following retaining shape jack are obtained. The shape-retaining jack group can be moved forward generally only by moving the.

  Moreover, it can be set as the aspect by which the some prior | preceding shape retention jack and the some following-increase shape retention jack are arrange | positioned alternately.

  As described above, the plurality of the preceding shape retaining jacks and the plurality of the following shape retaining jacks are alternately arranged so that the plurality of existing segments are always pressed by the preceding shape retaining jack or the following shape retaining jack. Can do. Therefore, the segment shape can be stably maintained.

  Furthermore, a rail can be made into the aspect which is a common rail which guides several front holding | maintenance shape jacks and several back keeping shape jacks.

  In this way, by providing a common rail for guiding both the preceding shape retaining jack and the following shape retaining jack, it is not necessary to provide a rail for each jack. Therefore, space saving can be achieved.

  The rail also includes a first rail that guides the plurality of preceding shape retaining jacks, and a second rail that guides the plurality of trailing shape retaining jacks, and the plurality of preceding shape retaining jacks and the first rail, A plurality of the trailing-back jacks and the second rail may be arranged at positions displaced from the shield tunnel excavation direction.

  As described above, the plurality of the preceding shape retaining jacks and the first rail, and the plurality of the following shape retaining jacks and the second rail are arranged at positions shifted from the direction of the shield tunnel, so that each The degree of freedom of movement of the shape retaining jack group can be increased. In particular, by making the width of the shape retaining jacks in each shape retaining jack group the same as the width of the segment, for example, the shape retaining jack group can be moved forward while the segment is always pressed by the shape retaining jack. .

  Furthermore, it can be set as the aspect provided with the slide mechanism which slides a precedent shape retaining jack and a following shape retaining jack with respect to the direction which cross | intersects the digging direction of a shield tunnel.

  Thus, by providing the slide mechanism for sliding the shape retaining jack, the position of the shape retaining jack with respect to the width of the shield tunnel can be easily adjusted. Further, when the segment is pressed by the shape retaining jack, it is sufficient to provide the jack only on one side.

  According to the segment shape holding device in the shield tunnel according to the present invention, the segment shape can be held in a wide range, and the shape holding jack can be stably advanced.

It is a sectional side view of a shield machine provided with the segment shape holding | maintenance apparatus in the shield tunnel which concerns on embodiment of this invention. It is a top view of a segment shape holding device. It is a front view of a segment shape holding device. It is a typical side view of the trolley | bogie in a segment shape holding | maintenance apparatus. It is a circuit diagram of the hydraulic circuit in a segment shape holding device. It is process drawing which shows the operation | movement process of a segment shape holding | maintenance apparatus. FIG. 7 is a process drawing following FIG. 6. It is a side view which shows typically the trolley | bogie mounted on the surface with an unevenness | corrugation. It is a front view of the other example of a segment shape holding | maintenance apparatus. It is explanatory drawing explaining operation | movement of a segment shape holding | maintenance apparatus. It is a front view of other example of a segment shape maintenance device. It is a side view of the further another example of a segment shape holding | maintenance apparatus.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each embodiment, portions having the same function are denoted by the same reference numerals, and redundant description may be omitted.

  1 is a side sectional view of a shield machine equipped with a segment shape holding device in a shield tunnel according to an embodiment of the present invention, FIG. 2 is a plan view of the segment shape holding device, and FIG. 3 is a front view of the segment shape holding device. FIG. In the following description, the description will proceed mainly with the face side of the tunnel as the front and the wellhead side as the rear. Further, the existing segment after assembly is simply referred to as a segment, and the segment before assembly is referred to as a segment piece.

  As shown in FIG. 1, the shield machine 1 constructs a shield tunnel T, and includes an outer cylinder portion 11. A cutter head 12 is attached in front of the outer cylinder portion 11. A plurality of cutters are attached to the cutter head 12. By rotating the cutter head 12, the cutter attached to the cutter head 12 excavates a natural ground.

  A chamber 13 is formed behind the cutter head 12, and earth and sand excavated by the cutter head 12 are collected in the chamber 13. In the chamber 13, the tip of a screw conveyor 14 is disposed. By operating the screw conveyor 14, the earth and sand collected in the chamber 13 is conveyed backward.

  Further, an erector 15 is attached to the rear of the chamber 13. The erector 15 includes a gripping claw for gripping the segment piece P. The erector 15 grips the segment piece P conveyed to the erector 15 and attaches it to a predetermined position. A shield jack 16 is attached to the rear portion of the outer cylinder portion 11.

  By extending the shield jack 16, a reaction force is applied to the segment S provided as the outer wall of the shield tunnel T to advance the shield machine 1. Further, a tail seal 17 is provided at the rear end portion of the outer cylinder portion 11. A backfilling injection material is injected between the segment S and the natural ground from the rear end portion of the outer cylinder portion 11. The tail seal 17 prevents the backfilling injection material before solidification from entering the shield machine 1.

  Behind the shield machine 1, a floor slab 2 is provided as a structure. The floor slab 2 is constructed by arranging a plurality of box culverts 21 side by side. On the floor slab 2, an excavator succeeding carriage 22 is provided. On the floor slab 2, a rail (not shown) extending in the direction of excavation of the shield tunnel T is laid, and the excavator succeeding carriage 22 can travel on this rail. The excavator succeeding carriage 22 moves forward following the advance of the shield excavator 1.

  A segment shape holding device 3 is provided between the shield machine 1 and the floor slab 2. The segment shape holding device 3 includes a carriage 4. The carriage 4 is connected to the shield machine 1 and moves following the shield machine 1. Moreover, as schematically shown in FIG. 4, the carriage 4 includes a plurality of vehicles 41 to 45. The plurality of vehicles 41 to 45 are connected to each other adjacent to each other in the front-rear direction, and the subsequent vehicles 42 to 45 move as the leading vehicle 41 moves. However, the number of carriages may be one.

  A pedestal supported by the trolley 4 is provided above each of the plurality of vehicles 41 to 45 in the trolley 4, and a rail 5 is laid on the pedestal. The rail 5 extends along the excavation direction of the shield tunnel T. On the rail 5, a leading shape retaining jack group 6 and a trailing shape retaining jack group 7 are provided. In addition, as a rail 5, in addition to a normal rail, I-shaped steel, H-shaped steel, or other modified cross-section steel can be used.

  Further, as shown in FIG. 2, each of the preceding shape retaining jack group 6 and the following shape retaining jack group 7 includes five shape retaining jacks 61 to 65 and 71 to 75. In FIG. 2, all of the preceding shape retaining jacks 61 to 65 in the preceding shape retaining jack group 6 are contracted, and all the following shape retaining jacks 71 to 75 in the following retaining shape jack group 7 are expanded. Further, the preceding shape retaining jacks 61 to 65 may be in an extended state, and the following shape retaining jacks 71 to 75 may be contracted.

  The preceding shape retaining jacks 61 to 65 of the preceding shape retaining jack group 6 and the following shape retaining jacks 71 to 75 of the following shape retaining jack group 7 are alternately arranged. Specifically, from the face side, the leading first shape retaining jack 61, the trailing first retaining shape jack 71, the leading second retaining shape jack 62, the trailing second retaining shape jack 72, and the leading third retaining shape jack 63. The following third shape retaining jack 73, the preceding fourth shape retaining jack 64, the following fourth shape retaining jack 74, the preceding fifth shape retaining jack 65, and the following fifth shape retaining jack 75 are arranged in this order. .

  All of the shape retaining jacks 61 to 65 and 71 to 75 in the shape retaining jack groups 6 and 7 can be moved forward and backward along the rail 5. In addition, the preceding shape retaining jacks 61 to 65 in the preceding shape retaining jack group 6 are integrally connected to each other by the preceding jack connecting rod 66 which is a connecting member of the present invention. The trailing jacks 71 to 75 are integrally connected to each other by a trailing jack connecting rod 76.

  Furthermore, between the preceding fourth shape retaining jack 64 and the succeeding third shape retaining jack 73, a shape retaining jack group moving means and a jack group moving cylinder 67 which is a shape retaining jack moving means are provided. The jack group moving cylinder 67 moves relative to the preceding fourth shape retaining jack 64 and the following third shape retaining jack 73 by extending and contracting. Therefore, for example, when the preceding fourth shape retaining jack 64 holds the segment shape, the trailing third shape retaining jack 73 moves, and for example, the trailing third shape retaining jack 73 performs the segment shape retention. If so, the preceding fourth shape retaining jack 64 moves. Further, the preceding shape retaining jacks 61 to 65 are connected by a preceding jack connecting rod 66, and the following retaining shape jacks 71 to 75 are connected by a following jack connecting rod 76. Therefore, by moving the leading fourth shape retaining jack 64 and the trailing third shape retaining jack 73 relatively, the leading shape retaining jack group 6 and the trailing shape retaining jack group 7 are relatively moved. It is done.

  The shape retaining jacks 61 to 65 and 71 to 75 all have the same configuration. This configuration will be described by taking the first first shape retaining jack 61 as an example. As shown in FIGS. 2 and 3, the preceding first shape retaining jack 61 includes a cylinder 61A and two rods 61B and 61C, and the cylinder 61A is engaged with the rail 5 so that the preceding first shape retaining jack 61 is engaged. 61 is movable.

  In addition, the rods 61B and 61C in the first first shape retaining jack 61 can be expanded and contracted with respect to the cylinder 61A in the direction intersecting the extending direction of the rail 5, more specifically in the orthogonal direction. Among these, the right rod 61B can extend to the right side when viewed from the face side, and the left rod 61C can extend to the left side when viewed from the face side.

  Holding members 61D and 61E are attached to the ends of the left and right rods 61B and 61C, respectively. A joint is provided between the right rod 61B and the right holding member 61D, and the right holding member 61D can swing with respect to the right rod 61B. Similarly, a joint is also provided between the left rod 61C and the left holding member 61E. Therefore, the surfaces of the left and right holding members 61D and 61E can be arranged along the tunnel surface.

  When these left and right rods 61B and 61C are in the extended state, the segment shape is maintained by the preceding first shape retaining jack 61. In addition, when the left and right rods 61B and 61C are in the contracted state, the segment shape holding by the preceding first shape retaining jack 61 is released, and the preceding first shape retaining jack 61 can be moved along the rail 5.

  As shown in FIG. 5, the preceding shape-holding jacks 61 to 65 in the preceding shape-holding jack group 6 are configured to be able to expand and contract in synchronization through a common hydraulic circuit. For this reason, the expansion and contraction of the preceding shape retaining jacks 61 to 65 is performed in the same manner. Similarly, the trailing retaining jacks 71 to 75 in the trailing retaining jack group 7 are configured to be extended and contracted in synchronization through a common hydraulic circuit. On the other hand, the jack group moving cylinder 67 is configured to operate independently of the shape retaining jacks 61 to 65 and 71 to 75.

  Further, the carriage 4 is provided with a segment conveying device 8 shown in FIG. The segment transport device 8 includes a plurality of push-up devices 81, and the plurality of push-up devices 81 are arranged in parallel along the direction in which the shield tunnel T is dug. By sequentially moving the push-up device 81 up and down, the segment piece P is conveyed from the push-up device 81 located at the rearmost position to the push-up device 81 located at the foremost position.

  As shown in FIG. 1, a segment transfer device 9 is provided between the excavator succeeding carriage 22 and the shield excavator 1. The segment transfer device 9 includes a movement guide member 91 and a segment gripping member 92. The movement guide member 91 is stretched between the excavator succeeding carriage 22 and the shield excavator 1 and moves the segment gripping member 92. The segment gripping member 92 can grip the segment piece P mounted on the excavator succeeding carriage 22 and moves along the movement guide member 91 to segment the segment piece P mounted on the excavator succeeding carriage 22 into the segment. Transfer to the transfer device 8.

  Further, the segment gripping member 92 is movable between the excavator succeeding carriage 22 and the rearmost push-up device 81 in the segment conveying device 8. With this segment transfer device 9, the segment piece P mounted on the excavator succeeding carriage 22 can be transferred to the segment transport device 8.

  Next, the operation of the segment shape holding device according to the present embodiment will be described. The segment shape holding device 3 holds the segment shape between the shield machine 1 and the floor slab 2 when digging with the shield machine 1. The shield machine 1 advances the shield tunnel and assembles the segment S at the same time.

  In assembling the segments, a segment piece carried from a vertical shaft (not shown) is conveyed to the excavator succeeding carriage 22 by a segment conveyance carriage (not shown). The segment piece P is transferred from the excavator succeeding carriage 22 arranged at the tip of the floor slab 2 to the segment conveying device 8 by the segment transfer device 9. Thereafter, the segment is transported by the segment transport device 8 to the movable range of the erector 15 provided in the shield machine 1.

  When the segment piece P is conveyed to the movable range of the erector 15, the segment piece P is assembled at a predetermined position by the erector 15 as shown in FIG. At this time, all of the shape retaining jacks 61 to 65 and 71 to 75 in the shape retaining jack groups 6 and 7 are extended, and the segment shape is maintained. Further, the jack group moving cylinder 67 is in a contracted state.

  When the assembly of the segment piece P to the predetermined position by the erector 15 is completed, the trailing retaining jacks 71 to 75 in the trailing retaining jack group 7 are contracted to release the segment shape retention by the trailing retaining jack group. To do. At this time, in the preceding shape retaining jacks 61 to 65 in the preceding shape retaining jack group 6, the preceding shape retaining jacks 61 to 65 are kept in an extended state, and the segment shape is maintained.

  Subsequently, the jack group moving cylinder 67 is extended, and the trailing retaining jack group 7 is moved relative to the preceding retaining jack group 6. At this time, the preceding shape retaining jacks 61 to 65 in the preceding shape retaining jack group 6 extend to hold the segment shape. For this reason, since the preceding shape retaining jack group 6 is stopped relative to the shield tunnel, the following shape retaining jack group 7 moves forward.

  When the jack group moving cylinder 67 is fully extended in this way, the shape-retaining jacks 61 to 65 and 71 to 75 are arranged at substantially equal intervals, as shown in FIG. Thereafter, the shield machine 1 is advanced to the position shown in FIG. 6C while rotating the cutter head 12 in the shield machine 1.

  As the shield machine 1 advances, the carriage 4, the rail 5, the shape retaining jack groups 6, 7 and the like are also advanced. Further, a box culvert is assembled between the floor slab 2 and the segment shape holding device 3 which are spread as the shield machine 1 advances. The floor slab 2 is extended by assembling the box culvert.

  Thereafter, when the assembly of the box culvert is completed, the preceding shape retaining jacks 61 to 65 in the preceding shape retaining jack group 6 are contracted to release the segment shape retention by the preceding shape retaining jack group 6. At this time, in the following type of retaining jacks 71 to 75 in the following type retaining jack group 7, the trailing shape retaining jacks 71 to 75 are kept in an extended state, and the segment shape is maintained.

  Subsequently, as shown in FIG. 7A, the jack group moving cylinder 67 is contracted, and the trailing retaining jack group 7 is moved relative to the preceding retaining jack group 6. At this time, the trailing retaining jacks 71 to 75 in the trailing retaining jack group 7 extend to hold the segment shape. For this reason, since the trailing shape retaining jack group 7 is stopped relative to the shield tunnel, the preceding shape retaining jack group 6 moves forward.

  Thus, when the jack group moving cylinder 67 is completely contracted, the preceding shape retaining jacks 61 to 65 are disposed at positions close to the following shape retaining shape jacks 71 to 75, respectively. After that, as shown in FIG. 7B, the segment transfer device 9 transfers the segment piece P from the excavator succeeding carriage 22 to the segment conveying device. Then, returning to the process shown in FIG. 6A, the segment piece P is assembled at a predetermined position. Thereafter, the shield tunnel is constructed by repeating the same process.

  Thus, in the shield machine 1 provided with the segment shape holding device 3 according to the present embodiment, the segment shape holding device 3 holds the segment shape when the shield machine 1 is dug. Here, the segment shape holding device 3 holds the segment shape. For this reason, even when a side earth pressure is applied to the shield tunnel, the segment shape can be suitably maintained.

  Further, the segment shape holding device 3 has a preceding retaining jack group 6 including a plurality of preceding retaining jacks 61 to 65 and a trailing retaining jack group 7 including a plurality of succeeding retaining jacks 71 to 75. Yes. For this reason, in holding the segment shape, the segment shape can be held in a wide range.

  Further, the preceding shape retaining jack group 6 and the following shape retaining jack group 7 are both capable of moving forward along the rails 5 laid along the shield tunnel digging direction. For this reason, when the shape retaining jack groups 6 and 7 are advanced in the shield tunnel excavation direction, they can be stably advanced.

  A plurality of preceding shape retaining jacks 61 to 65 and a plurality of following shape retaining jacks 71 to 75 are alternately arranged. Therefore, when the preceding shape retaining jacks 61 to 65 are advanced, the segment shape is held by the following shape retaining jacks 71 to 75, and when the following shape retaining jacks 71 to 75 are advanced, the preceding shape retaining jacks are retained. The segment shape can be maintained by the jacks 61-65. For this reason, the segment S can always be pressed by the shape retaining jack. Therefore, the segment shape can be stably maintained.

  Further, the rail 5 is laid on a plurality of vehicles 41, 42, 43... In the cart 4 arranged in the direction of excavation of the shield tunnel. For this reason, as shown in FIG. 8, for example, even when the shield tunnel has unevenness, the unevenness of the shield tunnel can be absorbed by the inclination of the adjacent vehicles 42 and 43. Can be maintained.

  Further, the preceding shape-holding jacks 61 to 65 in the preceding shape-holding jack group 6 are all expanded and contracted in synchronization through a common hydraulic circuit. Similarly, the trailing retaining jacks 71 to 75 in the trailing retaining jack group 7 are all expanded and contracted in synchronization through a common hydraulic circuit. For this reason, the expansion and contraction of the plurality of preceding shape retaining jacks 61 to 65 and the plurality of trailing shape retaining jacks 71 to 75 can be easily synchronized.

  Further, the segment shape holding device 3 is arranged between the shield machine 1 and the floor slab 2. For this reason, the segment shape can be suitably maintained between the shield machine 1 and the floor slab 2. In addition, the leading shape retaining jack group 6 and the trailing shape retaining jack group 7 are both guided to move by the common rail 5. For this reason, since it is not necessary to provide a rail for each jack group, space can be saved correspondingly.

  By the way, in the shield tunnel T, the segment shape is maintained by the shield machine 1 and the constructed floor slab 2, but between the shield machine 1 and the floor slab 2, the shield machine 1 and the floor slab 2 are used. Segment shape maintenance is not performed. In this respect, since the segment shape holding device 3 is set between the shield machine 1 and the floor slab 2, the segment shape holding between the shield machine 1 and the floor slab 2 can be suitably performed. .

  Further, the plurality of preceding shape retaining jacks 61 to 65 and the plurality of succeeding shape retaining jacks 71 to 75 are fixedly connected by a preceding jack connecting rod 66 and a following jack connecting rod 76, respectively. Further, the jack group moving cylinder 67 is connected to the leading fourth shape retaining jack 64 and the trailing third shape retaining jack 73, and the leading fourth shape retaining jack 64 and the trailing third shape retaining jack 73 are connected to each other. By moving the jack group moving cylinder 67, the leading shape retaining jack group 6 and the trailing shape retaining jack group 7 are moved. For this reason, the shape retaining jack groups 6 and 7 can be moved only by moving one set of shape retaining jacks.

  In the above embodiment, the preceding shape retaining jacks 61 to 65 in the preceding shape retaining jack group 6 and the following shape retaining jacks 71 to 75 in the following shape retaining jack group 7 are guided by the common rail 5 and moved. . On the other hand, as shown in FIG. 9, the first rail 51 for guiding the preceding shape retaining jack 61 and the second rail 52 for guiding the following shape retaining jack 71 may be provided. 2 are also guided by the first rail 51, and the second trailing shape 72 to the fifth preceding shape jack 75 are also moved to the second rail 52. Guided.

  Here, the preceding shape-preserving jacks 61 to 65 and the first rail 51 are located above the second rail 52, and are disposed at positions shifted from the digging direction of the shield tunnel T. For this reason, when the preceding shape retaining jacks 61 to 65 are moved, the positional relationship is such that the trailing shape retaining jacks 71 to 75 and the second rail 52 do not interfere with each other. Similarly, when the trailing retaining jacks 71 to 75 move, the leading retaining jacks 61 to 65 and the first rail 51 are in a positional relationship that does not interfere.

  The supporting members that support the first rail 51 are provided at positions separated from each other on both sides or front and rear sides of the second rail 52 and the trailing retaining jack group 7, for example, and are not in contact with the preceding retaining jack group 6. Is arranged. Further, the first rail 51 can be prevented from coming into contact with the rearward holding jack group 7 by suspending the first rail 51 from above or by supporting it from the side.

  Further, the separation distance between the preceding shape-preserving jacks 61 to 65 corresponds to the thickness of the segment S (the length along the digging direction of the shield tunnel T at the time of installation) and is the same. Similarly, the separation distance between the trailing retaining jacks 71 to 75 corresponds to the thickness of the segment S and is the same.

  In the aspect shown in FIG. 9, the preceding shape retaining jacks 61 to 65 and the following shape retaining jacks 71 to 75 are allowed to move forward in a state in which they do not interfere with each other. For this reason, the freedom degree at the time of moving the preceding shape retaining jacks 61-65 and the following shape retaining jacks 71-75 can be raised. In particular, since the separation distance between the preceding shape retaining jacks 61 to 65 and the separation distance between the following shape retaining jacks 71 to 75 are the same as the thickness of the segment S, the shape retaining jack is always maintained while the segment shape is maintained. The groups 6 and 7 can be moved forward.

  For example, as shown in FIG. 10, six segments S1 to S6 are provided between the floor slab 2 and the shield machine 1, and the first segment S1 to the eighth segment S8 are connected to the shape retaining jack. The case where it presses by 61-65 and 71-75 is demonstrated. In FIG. 10, the shape retaining jack that is changed from the extended state to the contracted state is represented by a circle, and the shape retaining jack that maintains the expanded state is schematically represented by a square mark.

  In FIG. 10A, the first segment S1 to the fifth segment S5 are pressed by the preceding shape retaining jacks 61 to 65, and the second segment S2 to the sixth segment S6 are pressed by the following shape retaining jacks 71 to 75. Is shown. When the preceding shape retaining jacks 61 to 65 are advanced from this state, the preceding shape retaining jacks 61 to 65 are contracted to release the segment shape retention. At this time, the segment holding is performed by pressing the second segment S2 to the sixth segment S6 with the trailing holding jacks 71 to 75. In this state, the preceding shape retaining jacks 61 to 65 are advanced. At this time, the seventh segment S7 is assembled by the shield machine 1.

  Next, as shown in FIG.10 (b), the segment shape holding | maintenance is performed by pressing the 3rd segment S3-the 7th segment S7 with the advance shape-keeping jacks 61-65. The floor slab 2 is constructed in the first segment S1 released from the pressed state, and the shape of the first segment S1 is held by the floor slab 2. Subsequently, the trailing shape retaining jacks 71 to 75 are contracted to release the segment shape retention. In this state, the trailing jacks 71 to 75 are advanced. At this time, the eighth segment S8 is assembled by the shield machine 1.

  Furthermore, as shown in FIG.10 (c), the segment shape holding | maintenance is performed by pressing the 4th segment S4-the 8th segment S8 with the trailing | retained jacks 71-75. The floor slab 2 is constructed in the second segment S2 released from the pressed state, and the shape of the first segment S1 and the second segment S2 is maintained by the floor slab 2.

  Subsequently, the preceding shape retaining jacks 61 to 65 are contracted to release the segment shape retention. In this state, the preceding shape retaining jacks 61 to 65 are advanced. Thereafter, by repeating this process, the shield tunnel is dug while maintaining the segment shape. In this manner, the shape retaining jack groups 6 and 7 can be moved forward with respect to the segment S while the segment shape is always maintained.

  Furthermore, in the above embodiment, the rods 61B and 61C are provided on both sides of the preceding shape retaining jack 61. However, as shown in FIG. It can also be set as the aspect used as the jack 69. FIG. A holding member 69 </ b> D is provided on the other side of the preceding shape retaining jack 69. Also in this example, the other shape retaining jacks can have the same configuration as the preceding shape retaining jack 69.

  Further, the preceding shape retaining jack 69 is provided with a slide mechanism 69C. The slide mechanism 69 </ b> C holds the preceding shape retaining jack 69 so as to be slidable in a direction intersecting the digging direction of the shield machine 1. Here, the direction intersecting the digging direction of the shield machine 1 is a direction orthogonal to the digging direction of the shield machine 1.

  The slide mechanism 69 </ b> C is disposed so as to be movable along the rail 5. For this reason, when the slide mechanism 69 </ b> C moves along the rail 5 in the digging direction of the shield machine 1, the preceding shape retaining jack 69 moves in the digging direction of the shield machine 1.

  In the aspect shown in FIG. 11, the preceding shape retaining jack 69 can be slid in a direction orthogonal to the digging direction of the shield machine 1. For this reason, it is easy to adjust the position of the preceding shape retaining jack 69 in the width direction of the shield tunnel T. Therefore, the segment can be easily pressed by providing the cylinder 69A and the rod 69B only on one side.

  Furthermore, in the above embodiment, the gantry 4 is supported by the carriage 4, but as shown in FIG. 12, the gantry 96 is supported by the portal support member 95 provided in the shield machine 1. It can also be set as an aspect. In this case, the support member 95 is erected at the rear end portion of the outer cylinder portion 11 in the shield machine 1, and the gantry 96 is cantilevered by the support member 95. The rails 5 can be laid on the gantry 96, and the shape retaining jack groups 6 and 7 can be provided. A work deck provided in the shield machine 1 can also be used as the gantry 96.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the shape retaining jack extends and contracts along the horizontal direction, but may be configured to expand and contract along the vertical direction and other radial directions of the shield tunnel T. Further, the floor slab 2 is constructed by assembling the box culvert, but the floor slab can be formed by other modes. Furthermore, although the segment shape holding | maintenance apparatus 3 is arrange | positioned between the shield machine 1 and the floor slab 2, it can also be set as the aspect arrange | positioned in another position.

  Moreover, in the said embodiment, it is set as the aspect which moves the shape-retaining jack group entirely by moving one shape-retaining jack, However, It can also be set as the aspect which moves a shape-retaining jack separately. Furthermore, in the above-described embodiment, the preceding retaining jack group and the trailing retaining jack group are moved along one rail. However, a rail is provided for each of the preceding retaining jack group and the following retaining jack group, and the moving is performed along each rail. It can also be set as the aspect made to do. In addition, the plurality of shape retaining jacks 61 to 65 and 71 to 75 in the shape retaining jack groups 6 and 7 are all operated in synchronism, but may be configured to operate without being synchronized. .

DESCRIPTION OF SYMBOLS 1 ... Shield machine 2 ... Floor slab 3 ... Segment shape holding device 4 ... Carriage 5 ... Rail 6 ... Predecessor holding jack group 7 ... Trailing holding jack group 8 ... Segment conveyance apparatus 9 ... Segment transfer apparatus 11 ... Outside Cylinder part 12 ... Cutter head 13 ... Chamber 14 ... Screw conveyor 15 ... Electa 16 ... Shield jack 17 ... Tail seal 21 ... Box culvert 22 ... Engraving machine succeeding carriages 41, 42, 43 ... Vehicle 51 ... First rail 52 ... Second Rail 61 ... Preceding first shape retaining jack 61A ... Cylinder 61B ... Right rod 61C ... Left rod 61D ... Right retaining member 61E ... Left retaining member 62 ... Preceding second shape retaining jack 63 ... Preceding third shape retaining jack 64 ... Preceding first 4 shape retaining jack 65 ... preceding fifth shape retaining jack 66 ... preceding jack connecting rod 67 ... jack group moving cylinder 69 ... preceding shape retaining jack 69A ... Cylinder 69B ... Rod 69C ... Slide mechanism 69D ... Holding member 71 ... Trailing first shape retaining jack 72 ... Trailing second shape retaining jack 73 ... Trailing third shape retaining jack 74 ... Trailing fourth shape retaining shape Jack 75 ... 5th shape retaining jack 76 following ... Jack following connecting rod 81 ... Push-up device 91 ... Segment gripping member 92 ... Traveling member P ... Segment piece T ... Shield tunnel S ... Segment

Claims (8)

A gantry that moves following the shield machine when the shield machine that constructs the shield tunnel moves forward ,
A rail mounted on the gantry and extending along the direction of excavation of the shield tunnel ;
A preceding shape retaining jack group having a plurality of preceding shape retaining jacks that are extendable in the radial direction of the shield tunnel and that retain the shape of the segment constructed in the shield tunnel when extended,
After the pre-shaped jack is arranged spaced apart in the shield tunnel digging direction, can be expanded and contracted in the radial direction of the shield tunnel, and retains the shape of the segment constructed in the shield tunnel when extended A rear-running jack group having a plurality of hijacking-type jacks,
The preceding shape retaining jack group and the following shape retaining jack group are capable of moving forward along the rail,
Segment-shaped holding device in shield tunnel, characterized in that it comprises a shape-retaining jacking group moving means for moving relative excavation direction and said trailing shape retaining jack unit and the prior shape-keeping jack group the shield tunnel . A carriage that moves following the shield machine by moving forward the shield machine that constructs the shield tunnel;
A rail supported by the carriage and extending along the direction of excavation of the shield tunnel;
A preceding shape retaining jack group having a plurality of preceding shape retaining jacks that are extendable in the radial direction of the shield tunnel and that retain the shape of the segment constructed in the shield tunnel when extended,
After the pre-shaped jack is arranged spaced apart in the shield tunnel digging direction, can be expanded and contracted in the radial direction of the shield tunnel, and retains the shape of the segment constructed in the shield tunnel when extended A rear-running jack group having a plurality of hijacking-type jacks,
The preceding shape retaining jack group and the following shape retaining jack group are capable of moving forward along the rail,
A segment shape holding device in a shield tunnel, characterized by comprising a shape retaining jack group moving means for moving the preceding shape retaining jack group and the following shape retaining jack group relative to the direction of excavation of the shield tunnel. .   The segment shape holding device for a shield tunnel according to claim 1, wherein the gantry is supported by a single or a plurality of carriages arranged in the direction of excavation of the shield tunnel. 2. At least one of a plurality of preceding shape retaining jacks in the preceding shape retaining jack group and a plurality of following shape retaining jacks in the following retaining shape jack group is extended and contracted synchronously through a common hydraulic circuit. The segment shape holding device in the shield tunnel according to any one of claims 3 to 4 . A structure is constructed at a rear position of the shield machine,
The segment shape holding | maintenance apparatus in the shield tunnel of any one of Claims 1-4 provided between the said shield machine and the said structure. The plurality of the preceding shape retaining jacks and the plurality of the following shape retaining jacks are fixedly connected by connecting members, respectively.
The shape retaining jack group moving means moves the part of the preceding shape retaining jack group and the part of the following shape retaining jack group relative to the digging direction of the shield tunnel. The segment shape holding device in the shield tunnel according to any one of claims 1 to 5 , wherein the group of jacks and the following retaining jack are moved as a whole. The segment shape holding device according to any one of claims 1 to 6 , wherein the plurality of preceding shape retaining jacks and the plurality of trailing shape retaining jacks are alternately arranged. The segment shape maintenance in the shield tunnel according to any one of claims 1 to 7 , wherein the rail is a common rail that guides the plurality of preceding retaining jacks and the plurality of trailing retaining jacks. apparatus.

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