JP2007051433A - Sealing structure between segments and sealing method for segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing structure between segments and a sealing method for the segments capable of preventing the damage of a sealing member when a widening segment is widened and, ensuring cut-off efficiency even in the case that a seam opening is generated between the segments in the future. <P>SOLUTION: In the sealing structure between segments making cut-off between rings of a ring-like widening segment 4 widened and contracted in the direction of the radius of a tunnel and a ring-like joint segment 3' connected to the widening segment 4, there is provided: a sealing member 13 that is interposed between inter-ring end faces 4a of the widening segments 4 that oppose each other and inter-ring end faces 3a of the joint segment 3', and extends along the circumferential direction of the joint segment 3'; and a pressure regulation means 14 that presses the sealing member 13 against the inter-ring end faces 4a of the widening segment 4, and regulates the pressure of the sealing member 13 pressed against the inter-ring end faces 4a of the widening segment 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sealing structure between segments that seals between a widened segment and a ring of a joining segment joined to the widened segment, and a sealing method between the segments.

In tunnel construction by the shield construction method, generally, the segment is assembled following the excavation work by the shield machine, and the inner wall surface of the excavated tunnel is covered. The segment has a configuration in which a plurality of segment members formed in a curved shape are assembled in an annular shape.
On the other hand, when providing, for example, an emergency parking zone or a branching / merging portion in a tunnel constructed using a shield machine, it is necessary to form a widened portion having an inner diameter wider than the front and rear tunnels in the tunnel. In addition, in the small-diameter shield construction method, it is necessary to form a widened part for passing the trolleys traveling in the mine, and this widened part is temporarily formed at the time of construction and is later reduced in the same way as the front and rear tunnels. It needs to be wide.

  In the case of forming the widened portion, usually, an overexcavated portion is formed by excavating from the ground, and a widened portion segment is formed in the excessively excavated portion to form the widened portion. In recent years, a shield machine that can freely widen the excavation area during excavation has been proposed, and there is a method of widening only a necessary portion with a widened cross section using this shield machine (for example, see Patent Documents 1 and 2).

  Further, when a wide section is formed by widening one section of the mine with the above-described widening shield machine, it is necessary to install a widening segment in the section. The widened segment is provided with a widened segment member that is rotatably attached by a hinge. The widened segment member is pushed inward from the inner side by a jack toward the digging portion, and is rotated to the outside around the hinge to be widened. Yes. In recent years, a widening segment has been proposed that includes a slide member that slides in the width direction of the pit and slides the widening segment member in the horizontal direction.

  Between the widened segment configured as described above and the non-widened segment joined to the widened segment (hereinafter referred to as a joined segment), an end face between the rings of the widened segment (the end face extending in the circumferential direction of the segment) Yes, the same shall apply hereinafter) and a sealing structure that prevents groundwater from entering the segment from between the ring-to-ring end faces of the joining segment. The conventional seal structure between segments consists of a seal member that is attached to the end face between the rings of the joint segment and that extends in the circumferential direction of the joint segment, and is formed in an annular shape. It is configured to be in close contact with the end surface between the rings of the widened segment (at the time of contraction) and also in close contact with the end surface between the rings of the widened segment after widening.

By the way, at the joints between the rings of the widened segment and the joining segment, the bolts that connect the segments loosen due to the effects of an earthquake, etc., or the segments deform and move, so that the end faces between the rings of both segments in the future It is expected that a phenomenon (hereinafter referred to as “opening”) occurs in which the gap is expanded and a gap of about 2 mm occurs. For this reason, even when this opening occurs, when the widening segment and the joining segment are conventionally jointed to secure the water stop performance between the ring of the widening segment and the joining segment, an enormous pressure is applied to the seal member. In close contact with the end face between the rings of the widened segment. As a result, even if a mesh opening occurs in the future, the seal member can be brought into close contact with the end face between the rings of the widened segment, and the water stoppage of the joint portion between the rings can be secured.
JP 2002-89170 A JP 2001-329781 A

  However, in the above-described conventional sealing structure between segments, the sealing member is in close contact with the end face between the rings of the widening segment before widening with enormous pressure, and when the widening segment is widened, the sealing member Since the widened segment member is slid while being in close contact with the end face between the rings of the widened segment, the seal member may be damaged, and if the seal member is damaged, water stoppage cannot be secured. There is a problem. On the other hand, if the pressure of the seal member is reduced in order to prevent the damage of the seal member, there is a problem that it is impossible to ensure the water stop performance at the above-mentioned future opening.

  In addition, when digging the shield machine, reaction force may be taken from the end face between the rings of the joining segment. In this case, the part (for example, spreader) that takes the reaction force of the shield machine and the end face between the rings of the joining segment There is a problem in that a seal member is interposed between the two, and the seal member may be crushed and damaged by the spreader.

The present invention takes the above-mentioned conventional problems into consideration, prevents damage to the seal member when widening the widened segment, and ensures water-stopping even when a gap occurs between future segments. It is an object of the present invention to provide a seal structure between segments and a method for sealing between segments.
Furthermore, even if it is a case where the reaction force at the time of digging a shield machine from the end surface between the rings of a joining segment is taken, it aims at preventing that a sealing member is damaged.

  The invention according to claim 1 is the seal structure between the segments for stopping water between the ring-shaped widened segment that is widened or contracted in the radial direction of the well and the ring-shaped joint segment that is joined to the widened segment. A seal member that is interposed between an end face between the rings of the widened segment and an end face between the rings of the joint segment facing each other, and extends along a circumferential direction of the joint segment; and Pressure adjusting means for adjusting the pressure of the seal member pressed against the end face between the rings of the widened segment and adjusting the pressure of the seal member pressed against the end face between the rings of the widened segment is provided.

  Due to such characteristics, the pressure of the seal member that is in close contact with the end face between the rings of the widened segment can be adjusted as appropriate by the pressure adjusting means, and the pressure of the seal member and the widened or narrowed width when the widened segment is widened or narrowed. After that, the pressure of the sealing member is set to an optimum pressure.

  According to a second aspect of the present invention, in the seal structure between segments according to the first aspect, a recess is formed along the circumferential direction of the joint segment on the end surface between the rings of the joint segment, The seal member is fitted so as to be able to enter and exit.

  Due to such a feature, when the joining segment is not joined to the widened segment and the sealing member is unnecessary, the sealing member is accommodated in the recess, and the sealing member hardly projects from the end face between the rings of the joining segment or does not project at all. It becomes a state. Further, when the joining segment is joined to the widened segment to stop water between the rings, the seal member protrudes from the recess and is in close contact with the end face between the rings of the widened segment.

  According to a third aspect of the present invention, in the seal structure between segments according to the first or second aspect, an elastic material that is in close contact with an end surface between the rings of the widened segment is pressed by the pressure adjusting means. It is characterized by comprising a structure laminated on a substrate.

  Due to such characteristics, the elastic material laminated on the substrate is not easily deformed, and the elastic material is closely attached to the entire end face between the rings of the widened segment without any gap.

  According to a fourth aspect of the present invention, in the seal structure between segments according to any one of the first to third aspects, a water stop member that stops water between the seal member and the joining segment is provided. It is a feature.

  With such a feature, the gap formed between the seal member and the end face between the rings of the joining segment is closed by the water stop member. In particular, when the seal member is pressed against the end face between the rings of the widened segment with a large pressure, when there is a gap between the seal member and the end face between the rings of the joining segment, the gap is closed.

  According to a fifth aspect of the present invention, there is provided a method for sealing between segments, in which a ring-shaped widened segment that is widened or contracted in the radial direction of the pit and a ring-shaped joint segment that is joined to the widened segment is stopped. When the widened segment is widened or contracted, the widened segment is interposed between the end faces of the widened segments facing each other and the end faces of the joint segments between the rings, and extends along the circumferential direction of the joint segments. The existing seal member is pressed against the end face between the rings of the widened segment at a pressure equivalent to the groundwater pressure, and after the widened segment is widened or shrunk, the seal member is stopped even when the opening between the rings in the future is opened. It is characterized in that it is pressed against the end face between the rings of the widened segment with a pressure that can secure water.

  Due to these characteristics, when the widened segment is widened or contracted, the seal member is pressed against the end face between the rings of the widened segment with the minimum necessary pressure to prevent the ingress of groundwater, and the pressure of the seal member is more than necessary. It doesn't get bigger. On the other hand, after the widened segment is widened or contracted, the sealing member is pressed against the end face between the rings of the widened segment with an enormous pressure that can ensure water stoppage even when a future opening between the rings occurs.

  According to the sealing structure between segments and the sealing method according to the present invention, the pressure of the seal member when the widened segment is widened or reduced and the pressure of the seal member after the widened or reduced width are set to optimum pressures, respectively. Therefore, when the widened segment is widened or contracted, it is not necessary to increase the pressure of the seal member more than necessary, and the seal member can be prevented from being damaged, and the seal after being widened or contracted The pressure of the member can be adjusted to an enormous pressure, and the water stoppage between the rings of the segments can be ensured even if an opening occurs in the future.

  Further, a recess is formed in the end surface between the rings of the joining segment along the circumferential direction of the joining segment, and the joining segment is not joined to the widened segment by fitting the seal member into the recess so as to be able to enter and exit. Sometimes, the seal member is accommodated in the recess so that it hardly protrudes from the end face between the rings of the joining segment or does not protrude at all, and when the joining segment is joined to the widened segment, the seal member protrudes from the recess. It becomes a state. As described above, since the seal member protrudes only when necessary, the seal member is hardly damaged at the time of attachment or at other times, and the damage of the seal member can be prevented. Further, when a reaction force is applied from the end surface between the rings of the joining segment in order to dig up the shield machine, the seal member is accommodated in the recess so that it hardly protrudes or does not protrude at all from the end surface between the rings of the joining segment. Thus, the seal member is not crushed by the portion that takes the reaction force of the shield machine, and damage to the seal member can be prevented.

  In addition, the elastic material laminated on the substrate is deformed by using a sealing member having a structure in which the elastic material in close contact with the end face between the rings of the widened segment is pressed on the substrate pressed by the pressure adjusting means. It is difficult, and the elastic material is closely attached over the entire end face between the rings of the widened segment without any gap, so that it is possible to ensure water-stopping between the ring of the widened segment and the joining segment.

  In addition, by providing a water stop member that stops water between the seal member and the end surface between the rings of the joining segment, the gap formed between the seal member and the end surface between the rings of the joint segment is blocked by the water stop member. Therefore, even if there is a gap between the seal member and the end face between the rings of the joining segment by pressing the seal member against the end face between the rings of the widening segment, the gap is closed and joined to the widening segment. It is possible to ensure water-stopping between the ring and the segment.

  Hereinafter, first and second embodiments of a sealing structure between segments and a sealing method between segments according to the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a plan view showing a situation in which the lining 2 is assembled in the tunnel T excavated by the shield machine X, and FIG. 2 is a perspective view showing the assembled lining 2.
As shown in FIGS. 1 and 2, a tunnel T having a circular cross section is excavated in the ground by a shield machine X, and a part of the tunnel T is widened in the width direction of the tunnel T. A widened portion T ′ having an oval cross section is formed.

  A lining 2 that covers the inner wall surface of the tunnel T is assembled in the tunnel T. This lining 2 has a configuration in which a plurality of ring-shaped segments 3, 4,... Are connected in the axial direction of the tunnel T, and each segment 3, 4. Each is arranged. The segments 3..., 4... Are formed along the inner wall surface of the wide circular portion T ′ having a circular cross section and the normal circular segment 3. And a widened segment 4 having a cross-sectional oval shape.

  FIG. 3A is a cross-sectional view taken along the line A-A shown in FIG. 1, and is a view when the widened segments 4 are in a state before being widened (reduced width state), and FIG. It is sectional drawing between AA shown in FIG. 1, and is a figure when it exists in the state (widening state) after the widening segment 4 ... was widened.

  As shown in FIGS. 2, 3 (a), and 3 (b), the circular segments 3... Have a structure in which a plurality of segment members 5 formed in an arcuate shape are assembled in an annular shape. Among the end surfaces of each segment member 5..., A plurality of holes (not shown) are formed in a linear end surface (inter-member end surface 5 a) extending along the axial direction of the circular segment 3. Adjacent segment members 5 and 5 are joined to each other by segment joints 6.

  The widened segments 4 are formed on the upper base segment 7 facing the ceiling surface of the widened portion T ′ of the tunnel T, the lower base segment 8 facing the bottom surface of the widened portion T ′, and the side wall surfaces on both sides of the widened portion T ′. The movable segments 9 and 9 are opposed to each other. The widened segment 4 is widened and contracted by moving the moving segments 9 and 9 on both sides in the width direction of the tunnel T, respectively. The moving segments 9, 9 are configured by assembling a plurality of segment members 10 formed in an arc shape into a semicircular arc shape. Among the end surfaces of each segment member 10..., A plurality of holes (not shown) are formed in a linear end surface (inter-member end surface 10 a) extending along the axial direction of the widened segment 4. Adjacent segment members 10, 10 are joined together by segment joints 11 made of bolts or the like to be inserted.

  The end surface of the circular segment 3 (end surface between rings 3a), that is, the end surface of the arc segment extending in the circumferential direction of the circular segment 3 among the end surfaces of the segment members 5, and the end surface of the widened segment 4 (end surface between rings 4a). That is, a plurality of holes (not shown) are formed in the arc-shaped end surfaces extending in the circumferential direction of the widened segment 4 among the end surfaces of the segment members 10... Adjacent circular segments 3 and 3 and adjacent widened segments 4 and 4 are joined by an inter-ring joint 12.

  4 is a perspective view showing a circular segment (joined segment 3 ′) joined to the widened segment 4, FIG. 5 is an enlarged perspective view of the inner surface of the joined segment 3 ′, and FIG. It is an expanded sectional view showing the seal structure which stops water between rings with joining segment 3 '. In FIG. 4, a cylinder 14 described later is omitted and not shown, and a seal member 13 described later is omitted and not shown in FIG.

  As shown in FIGS. 3 (a), 3 (b), 4, 5, and 6, the sealing structure for stopping water between the ring of the widened segment 4 and the joining segment 3 'has the widened segments facing each other. A seal member 13 interposed between the end face 4a between the rings 4 and the end face 3a between the rings of the joining segment 3 ', and a cylinder (pressure adjusting means) 14 for pressing the seal member 13 against the end face 4a between the rings of the widened segment 4. The O-ring (water-stop member) 15 is provided to stop water between the seal member 13 and the end surface 3a between the rings of the joining segment 3 '.

  The seal member 13 is a thin plate-like member extending along the circumferential direction of the joining segment 3 ′, and is an elastic material that is in close contact with the inter-ring end surface 4 a of the widened segment 4 on the substrate 18 pressed by the cylinder 14. 17 is laminated. Further, the sealing member 13 is fitted in an annular recess 16 formed on the end surface 3a between the rings of the joining segment 3 'and extending along the circumferential direction of the joining segment 3' so as to be able to go in and out. The thickness of the recess 13 is equal to the depth of the recess 16 or thinner than the depth of the recess 16. Further, the seal member 13 has a configuration in which a plurality of arc-shaped members 13a... Are connected in an annular manner via a joint 19 that can ensure water-stopping, and the joint portions of the members 13a. Further, the positions of the joint portions of the segment members 5 ..., 10 ... constituting the joining segment 3 'and the widened segment 4 are shifted.

  The cylinder 14 presses the seal member 13 against the end surface 4 a between the rings of the widened segment 4 and adjusts the pressure of the seal member 13 pressed against the end surface 4 a between the rings of the widened segment 4. The cylinder 14 is arranged on the joining segment 3 ′ side and is provided on the inner side surface of the joining segment 3 ′. The piston 20 of the cylinder 14 is provided through the bottom surface of the recess 16 formed in the end surface 3a between the rings of the joining segment 3 ', and a hole 21 for inserting the piston 20 is formed in the bottom surface of the recess 16. Is formed. The tip of the piston 20 is joined to the substrate 18 of the seal member 13 through the hole 21. Further, a plurality of cylinders 14 are arranged in parallel at a predetermined interval, and the plurality of cylinders 14 are vertical ribs of the joining segment 3 ′ (ribs extending along the axial direction of the joining segment 3 ′). 22 are arranged between.

  The O-ring 15 is a water-stop member made of an elastic material such as a rubber-based material, and is provided along both side surfaces of the seal member 13. The O-ring 15 faces both side surfaces of the seal member 13 and the both side surfaces. It is interposed between both side surfaces of the recess 16.

  FIG. 7 is an enlarged cross-sectional view showing the joint structure between the ring of the widened segment 4 and the joint segment 3 ′. As shown in FIG. 7, inter-ring joints 23 that join adjacent joint segments 3 ′ and widened segments 4 are disposed between the plurality of cylinders 14. The inter-ring joints 23 are composed of bolts 24 having male threads cut at both ends, nuts 25 and 25 screwed to both ends of the bolts 24, and washers 26. The bolts 24 are joined to each other. It is inserted through a hole 27 formed in the end surface 3a between the rings of the segment 3 '(the bottom surface of the recess 16), a hole 28 formed in the end surface 4a between the rings of the widened segment 4, and a hole 29 formed in the seal member 13, respectively. The nuts 25 and 25 are fastened from both sides. The end face 4a between the rings of the widened segment 4 is formed with a hole 28a through which the bolt 24 is inserted in the contracted state and a hole 28b through which the bolt 24 is inserted in the widened state.

  Next, a sealing method between the ring of the joining segment 3 ′ and the widening segment 4 when widening the widening segment 4 having the above-described configuration will be described.

  First, as shown in FIG. 1, the shield machine X is excavated to excavate the tunnel T, and the segments 3 and 4 are sequentially assembled in the excavated tunnel T. At this time, the widened segment 4 is assembled at the location of the widened portion T ′ of the tunnel T. At this time, the widened segment 4 is in a reduced width state shown in FIG. 3A, and its cross-sectional shape is the same circle as the circular segment 3.

  Next, as shown in FIG. 6, the pressure P <b> 1 of the seal member 13 that is pressed against the end surface 4 a between the rings of the widened segment 4 is adjusted to a pressure equivalent to the groundwater pressure P <b> 2 that springs outside the widened segment 4 by the cylinder 14. . Specifically, when the groundwater pressure P2 is 0.6 Mpa, the cylinder 14 is adjusted so that the seal member 13 presses the end surface 4a between the rings of the widened segment 4 with a pressure of 0.6 Mpa. The adjustment of the pressure P1 of the seal member 13 by the cylinder 14 may be performed immediately before the widening segment 4 is widened, or may be performed at the beginning of assembly in which the joining segment 3 ′ and the widening segment 4 are joined.

  Next, the inter-ring joints 12 that join adjacent widened segments 4 and 4 and the inter-ring joints 23 that join adjacent joint segments 3 ′ and the widened segment 4 are removed, and the widened segments 4 are removed from the tunnel T. It is widened in the width direction to obtain the widened state shown in FIG. At this time, the pressure P1 of the seal member 13 is adjusted by the above-described method, and the seal member 13 presses the end surface 4a between the rings of the widened segment 4 with a pressure P1 equivalent to the groundwater pressure P2.

  Next, after widening the widened segment 4, as shown in FIG. 8, the pressure P <b> 1 of the seal member 13 pressed against the end surface 4 a between the rings of the widened segment 4 is increased by the cylinder 14, thereby The pressure P1 ′ is adjusted to a level that can ensure water stoppage even when a mesh opening D occurs between the inter-ring end surface 3a of the segment 3 ′ and the inter-ring end surface 4a of the widened segment 4. Specifically, assuming a future opening amount (for example, 2 mm), even when the opening D occurs, the seal member 13 forms the end surface 4a between the rings of the widened segment 4 with a pressure equal to or higher than the groundwater pressure P2. The cylinder 14 is adjusted so as to press.

Further, after widening the widened segment 4, at the widened position, the inter-ring joints 12 ..., 23 ... are attached, and the adjacent widened segments 4, 4 and adjacent joint segments 3 'and the widened segment 4 are connected. Join each one.
Finally, a backfill material 29 made of a resin agent having excellent filling properties is filled into the internal space of the recess 16 formed on the back side of the seal member 13 from an injection port (not shown).

  According to the sealing structure between segments and the sealing method between segments having the above-described configuration, the pressure P1 of the sealing member 13 when widening the widened segment 4 and the pressure P1 ′ of the sealing member 13 after widening are optimum. Therefore, it is not necessary to increase the pressure P1 of the seal member 13 more than necessary when the widened segment 4 is widened, and the seal member 13 can be prevented from being damaged. In addition, the pressure P ′ of the seal member 13 after being widened can be adjusted to an enormous pressure, and even if a mesh opening D occurs in the future, the water stoppage between the rings of the joining segment 3 ′ and the widened segment 4 can be reduced. Can be secured.

  Further, the concave portion 16 is formed in the end surface 3a between the rings of the joining segment 3 ′, and the sealing member 13 is fitted into the concave portion 16 so as to be able to enter and exit, so that the joining segment 3 ′ is not joined to the widened segment 4. Sometimes, the seal member 13 is accommodated in the recess 16 so that the surface of the elastic member 17 of the seal member 13 and the end surface 3a between the rings of the joining segment 3 ′ are flush with each other and completely protrude from the end surface between the rings of the joining segment 3 ′. It will be in a state that does not. Further, when the joining segment 3 ′ is joined to the widened segment 4, the seal member 13 is protruded from the recess 16. Thus, since the seal member 13 protrudes only when necessary, the seal member 13 is not easily damaged at the time of attachment or at other times, and the damage of the seal member 13 can be prevented.

  As shown in FIGS. 1 and 9, when the reaction force is taken from the end surface 3a between the rings of the joining segment 3 ′ in order to advance the shield machine X, the sealing member 13 is accommodated in the recess 16 and joined. By preventing the segment 3 ′ from protruding from the end surface 3 a between the rings at all, the seal member 13 is not crushed by the spreader X ′ that takes the reaction force of the shield machine X, and damage to the seal member 13 can be prevented. it can.

  Further, since the sealing member 13 has a configuration in which the elastic material 17 that is in close contact with the end surface 4a between the rings of the widened segment 4 is laminated on the substrate 18 pressed by the cylinder 14, the elastic material laminated on the substrate 18 is used. 17 is not easily deformed, and the elastic material 17 is in close contact with the entire surface of the end face 4a between the rings of the widened segment 4 without a gap. As a result, it is possible to ensure water-stopping between the rings of the widened segment 4 and the joining segment 3 ′.

  Further, since an O-ring 15 is provided to stop water between the seal member 13 and the inter-ring end surface 3a of the joining segment 3 ', it is formed between the sealing member 13 and the inter-ring end surface 3a of the joining segment 3'. Since the formed gap is closed by the O-ring 15, the seal member 13 is pressed against the end surface 4a between the rings of the widening segment 4 with a large pressure, so that the space between the seal member 13 and the end surface 3a between the rings of the joining segment 3 'is increased. Even when there is a gap, the gap is closed. As a result, it is possible to ensure water-stopping between the rings of the widened segment 4 and the joining segment 3 ′.

[Second Embodiment]
Next, a second embodiment of the sealing structure between segments and the sealing method between segments according to the present invention will be described.

  10 is a diagram when the widened segments 4 are in a state before being widened (reduced width state), and FIG. 11 is a diagram when the widened segments 4 are in a state after being widened (widened state). It is. In addition, about the structure similar to 1st Embodiment mentioned above among the structures of 2nd Embodiment, the description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  As shown in FIGS. 10 and 11, the substrate 118 of the seal member 113 is formed with two grooves 118a and 118b having a concave cross section extending in the extending direction of the seal member 113 in parallel with an interval. ing. Elastic members 117 and 117 extending along the grooves 118a and 118b are attached to the grooves 118a and 118b, respectively. The elastic members 117 and 117 are provided so as to protrude from the surface of the substrate 118, and are in close contact with the end surface 4 a between the rings of the widened segment 4.

  Further, when the substrate 118 is in close contact with the end surface 4a between the rings of the widened segment 4, it is between the two elastic members 117, 117 between the substrate 118 and the end surface 4a of the widened segment 4 between the rings. A filling means 131 for filling the filler 130 with excellent filling properties is provided. The filling means 131 includes an injection hole 132 that penetrates the substrate 118, a joint 133 that communicates with the injection hole 132 on the back side of the substrate 118, and a tube 134 that is connected to the injection hole 132 via the joint 133. It is configured.

  The injection hole 132 is formed at a position between the two grooves 118a and 118b. The tube 134 is connected to a pumping means (not shown) that pumps the filler 130, and is configured to be removable from the joint 133 as needed.

  In the inter-segment seal structure provided with the seal member 113 having the above-described configuration, when either one of the two elastic members 117 and 117 is damaged and it is impossible to ensure water-stopping, it is not illustrated. The filler 130 is pumped by the pressure-feeding means, and the filler 130 is filled between the two elastic members 117 and 117 between the substrate 118 and the end surface 4a between the rings of the widened segment 4, and a new seal portion is formed. Can be formed. The tube 134 may be connected to the joint 133 only when the filler 130 is injected, and the tube 134 is usually removed.

  Moreover, in the sealing structure between segments provided with the sealing member 113 having the above-described configuration, the filler 130 may be filled after the widened segment 4 is widened, not only when the elastic member 117 is damaged. Specifically, after widening the widened segment 4, the tube 134 is inserted and connected to the joint 133, and the filler 130 is pumped by unillustrated pumping means, and the substrate 118 and the end surface 4 a between the rings of the widened segment 4 are connected. Between the two elastic members 117 and 117, the filler 130 is filled to form a new seal portion. Thereby, the water stop performance after widening can be improved.

  The embodiments of the inter-segment sealing structure and the inter-segment sealing method according to the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and may be appropriately selected without departing from the spirit of the present invention. It can be changed. For example, in the above-described embodiment, the case where the widened segment 4 is widened has been described. However, the present invention may be a case where the widened segment is narrowed.

  In the above-described embodiment, the cylinder 14 is used as the pressure adjusting means, but the present invention uses a screw jack mechanism, a pantograph mechanism, a ball screw mechanism, a spring biasing mechanism, or the like as the pressure adjusting means. May be. In addition, after the widening segment is widened / shrinked, the pressure adjusting means adjusts the pressure of the seal member to a pressure that can ensure water-stopping even when the openings between the rings in the future are opened. You may rearrange it.

  In the above-described embodiment, the O-ring 15 is used as a water stop member that stops water between the seal member 13 and the joining segment 3 ′. It may be a rubber packing interposed between them, a thin cloth-like rubber cover that closes the gap between the seal member and the joining segment, or a water stop member having another configuration.

  Further, in the present invention, the concave portion may not be formed on the end surface between the rings of the joining segment, or the sealing member may be a sealing member other than the sealing member made of the elastic material and the substrate, and the water stop member is provided. There may be no configuration, and a configuration in which the above configurations are appropriately combined may be used.

It is a top view showing the segment assembly situation for explaining a 1st embodiment concerning the present invention. It is a perspective view of the assembled segment for demonstrating 1st Embodiment based on this invention. It is sectional drawing between AA shown in FIG. 1, (a) is a figure of the state before the widening segment is widened, (b) is a figure of the state after the widening segment is widened. It is a perspective view showing the joining segment for demonstrating 1st Embodiment based on this invention. It is an expansion perspective view of the joining segment for explaining a 1st embodiment concerning the present invention. It is an expanded sectional view showing the seal structure between rings for explaining a 1st embodiment concerning the present invention. It is an expanded sectional view showing the junction structure between rings for explaining a 1st embodiment concerning the present invention. It is an expanded sectional view showing the sealing method between the rings for describing a 1st embodiment concerning the present invention. It is an expanded sectional view showing the joining segment at the time of excavating the shield machine for explaining the 1st embodiment concerning the present invention. It is an expanded sectional view showing the junction structure between rings for explaining a 2nd embodiment concerning the present invention. It is an expanded sectional view showing the junction structure between rings for explaining a 2nd embodiment concerning the present invention.

Explanation of symbols

3 'Joining segment 3a Inter-ring end face 4 (of the joining segment) Widening segment 4a End-of-ring end face 13, 113 (of the widening segment) Seal member 14 Cylinder (pressure adjusting means)
15 O-ring (water-stop member)
16 Recess 17, 117 Elastic material 18, 118 Substrate T Tunnel

Claims (5)

In the seal structure between the segments for stopping water between the ring-shaped widened segment that is widened or reduced in the radial direction of the well and the ring-shaped joint segment that is joined to the widened segment,
A seal member that is interposed between an end surface between the rings of the widened segment and an end surface between the rings of the joint segment facing each other, and extends along a circumferential direction of the joint segment;
Pressure adjusting means for adjusting the pressure of the seal member pressed against the end surface between the rings of the widened segment and pressing the seal member against the end surface between the rings of the widened segment; Seal structure. The seal structure between segments according to claim 1,
A recess is formed in the end surface between the rings of the joint segment along the circumferential direction of the joint segment, and the seal member is fitted in the recess so as to be able to go in and out. Seal structure. The seal structure between segments according to claim 1 or 2,
The seal member has a structure in which an elastic material that is in close contact with an end face between rings of the widened segment is laminated on a substrate pressed by the pressure adjusting means. The seal structure between segments according to any one of claims 1 to 3,
A seal structure between segments, wherein a water stop member for stopping water between the seal member and the joining segment is provided. In the sealing method between the segments for stopping water between the ring-shaped widened segment that is widened or contracted in the radial direction of the well and the ring-shaped joint segment that is joined to the widened segment,
When widening or reducing the width of the widened segment, the widened segment is interposed between the end faces of the widened segments facing each other and the end faces of the joint segments between the rings, and extends along the circumferential direction of the joint segments. The sealing member to be pressed against the end face between the rings of the widened segment at a pressure equivalent to the groundwater pressure,
After the widened segment has been widened or contracted, the seal member is pressed against the end face between the rings of the widened segment with a pressure that can ensure water-stopping even when opening between the rings in the future. Sealing method between.

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