JP2006266024A - Inter-ring joint, shielding segment, shielding construction method and shielded tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inter-ring joint for improving connectivity of a segment by a shielding machine, and also to provide a shielding segment, a shielding construction method, and a shielded tunnel. <P>SOLUTION: This slide lock type inter-ring joint is used for the shielding segment, and has: a female metal fitting 22 having a connecting projection storage part 72 and a fastening member 64; and a male metal fitting 16 having a connecting projection 50 having an expanded part 48. The fastening member 64 has: a slot 68 extending in the peripheral direction of the segment and having a width narrower than a diameter of the expanded part 48; and a plurality of openings 74 and 76 formed on both sides of the slot 68 and storing the expanded part 48 of the connecting projection 50. A surface abutting on the expanded part 48 of the fastening member 64 has a taper for thickening the thickness of the fastening member 64 along the slot 68 from the plurality of openings 74 and 76. This invention also relates to the shielding segment having the inter-ring joint, the shielding construction method and the shielded tunnel. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  More particularly, the present invention relates to an inter-ring joint, a shield segment, a shield construction method, and a shield tunnel that improve the connectivity of segments by a shield machine. .

  The shield method is a method of constructing a tunnel along a tunnel axis by connecting concrete segments sequentially to the rear part excavated by a shield machine, and is frequently used in recent years from the viewpoint of safety and workability. It is a construction method. Also, in recent years, shield segments are automatically connected using devices such as an erector equipped with a robot arm, etc., and bolts are tightened from segments with many work procedures such as bolt tightening and retightening. One-pass segments with good workability that can be firmly connected without the need for such work have been proposed.

  For example, Japanese Patent Laid-Open No. 2001-24696 (Patent Document 1) discloses a segment joint that uses a female metal fitting and a male metal fitting. In Japanese Patent Application Laid-Open No. 2001-24696, a female joint disposed on one of the segments is disclosed. Thus, a slide lock type segment joint is disclosed in which a male fitting that is movably disposed on another segment to be connected and that increases a fastening force as it is moved to a fastening position is connected. The slide lock type joint used for the segment described in Patent Document 1 accommodates a male bolt, and fastening is completed by a pressing force only from one direction. On the other hand, conventionally, insertion type joints are often used for joints between rings, and conventional shield segments are connected to the ring direction and segment direction by receiving the pressing force of the shield jack after positioning by an erector. Was concluded.

As described above, the conventional segment connects the ring composed of segments along the tunnel axis by using the step of fitting the inter-ring joint using a shield jack after the positioning process by the erector. Let me go. At this time, the conventional one-pass segment eliminates complicated work such as retightening and enables one-pass construction. There was a problem in construction that the segment could not be extended in the tunnel axis direction unless it was used in two stages.
Japanese Patent Laid-Open No. 2001-24696

  The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention provides an inter-ring joint with improved workability by enabling connection between segments and connection between rings in a single step. It aims at providing a shield segment, a shield construction method, and a shield tunnel.

That is, according to the present invention,
A slide lock type ring-to-ring joint used for shield segments,
A female fitting provided with a coupling protrusion accommodating portion and a fastening member;
A male fitting with a connecting projection with an extension,
The fastening member includes a slot extending in a circumferential direction of a segment and narrower than a diameter of the extension portion, and a plurality of openings formed on both sides of the slot to accommodate the extension portion of the connection protrusion. An inter-ring joint can be provided in which the surface that contacts the extension portion includes a taper that increases the thickness of the fastening member along the slot from the opening.

  According to invention of Claim 2 of this invention, the said expansion part can provide the joint between rings provided with the notch which has the taper of the angle which adapts the said taper.

  According to the invention of claim 3 of the present invention, it is possible to provide an inter-ring joint provided with a recess that accommodates the expansion portion on the surface that contacts the expansion portion.

  According to a fourth aspect of the present invention, there is provided a shielded segment comprising any of the above-described inter-ring joints and an insertion-type joint for connecting the segments in the circumferential direction around the tunnel axis. Is done.

According to the invention of claim 5 of the present invention, there is provided a shield construction method using a shield segment provided with an inter-ring joint according to any one of the above and an insertion type joint for connecting between segments,
The step of positioning the inter-ring joint of the shield segment according to any one of claims 1 to 3 adjacent to the inter-ring joint of the segment adjacent in the tunnel axial direction adjacent to the segment adjacent to the tunnel axial direction. When,
And a step of applying a pressing force in a direction to shorten the distance between the segment adjacent to the tunnel circumferential direction and the shield segment.

  According to the invention of claim 6 of the present invention, the step of arranging the shield segment includes a step of arranging a plurality of slide lock joints of the shield segment adjacent to each other in the tunnel axial direction and adjacent to each other in the circumferential direction. A shield method including a step of positioning so as to engage with the slide lock joint can be provided.

  According to the invention of claim 7 of the present invention, the step of applying the pressing force makes the tapered surface of the fastening member contact the tapered surface of the fastening member or is formed on the fastening member. A shield method including a step of fitting the extended portion into the recess can be provided.

  According to the eighth aspect of the present invention, there can be provided a shield tunnel constructed by connecting a plurality of the above-described shield segments in the tunnel circumferential direction and the tunnel axial direction.

  According to the present invention, since the shield segment and the ring can be fastened by only one step of positioning by the erector, it is possible to simplify the segment fastening step and improve the safety immediately after the cutter chamber. In addition, it is possible to provide an inter-ring joint, a shield segment, a shield method, and a shield tunnel that improve workability of the elector and enable a work period to be shortened along with improvement in construction efficiency.

  The present invention will be described below with reference to embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings.

  FIG. 1 is a perspective view showing a shield tunnel 10 using a shield segment having an inter-ring joint according to the present invention. In the shield tunnel 10 of the present invention, a segment 12 formed in advance as precast concrete or the like is connected in the circumferential direction of the tunnel to form a ring 14, and the constructed ring 14 is connected in the direction of the tunnel axis Ta to extend the tunnel. It will be done. In the segment 12, a male metal fitting 16 of a slide lock type joint and a male metal fitting 18 of an insertion type joint are embedded to enable fastening between the segments. In the embodiment shown in FIG. 1 of the present invention, the male metal fitting 16 is a slide lock type metal fitting, and the male metal fitting 18 is an insertion type joint. The adjacent segment 20 to which the ring 14 is fastened is provided with a female fitting 22 of a slide lock joint and a female fitting 24 of an insertion joint corresponding to the male fitting 16 and the male fitting 18, respectively.

  In the present invention, the female fitting 22 of the slide lock type joint accommodates the connecting projection having the extended portion of the corresponding male fitting 16 from both the left and right directions, and tightens as the corresponding extended portion of the male fitting 16 is inserted inside. It is designed to increase power. In addition, the female fitting 24 of the insertion type joint accommodates the corresponding male fitting 18 and is disposed in the female member 24 and is engaged with the notch of the bar member. A fastening force is generated by the locking member. In FIG. 1, for the purpose of explaining the arrangement of each metal fitting, an embodiment in which a male fitting 16 and a male fitting 18 are arranged on the segment 12 and female fittings 22 and 24 are arranged on the segment 20 is shown. However, according to the present invention, as long as the pair of fittings are arranged at positions where they are fitted to each other, and the female slide lock type joint and the insertion type joint are not arranged on the same end face of the segment, they are in any way with respect to the segment. Can be arranged.

  FIG. 2 shows an embodiment of the insert joint 26 used in the present invention. The insertion type joint 26 according to the present invention includes a female fitting 24 and a male fitting 18. The female fitting 24 generally includes a holder fitting 28, a backup fitting 30 disposed in the accommodation space formed in the holder fitting 28, and a lock member 32 held by the backup fitting 30 and the inner wall of the accommodation space. ing. The opening 34 continuing to the accommodation space has a shape that gradually increases in diameter toward the outside so as to facilitate positioning when accommodating a rod member of the male joint 18 described later. An anchor bar 36 is connected to the side of the holder metal 28 opposite to the opening 34 by welding or bolting to fix the holder metal 28 to the segment 20.

  The male fitting 18 of the insertion type joint 26 shown in FIG. 2 is generally disposed between a bar member 38, a base member 40 holding the bar member 38, and between the base member 40 and the bar member 38. And a stopper member 42 that is held movably. The bar member 38 is formed with a plurality of circumferentially extending notches 44 and is engaged with the engaging claws of the lock member 32 disposed on the female fitting 24 at a position where the segment 20 and the segment 12 are adjacent to each other. The fastening force between the female fitting 18 and the male fitting is generated. An anchor bar 36 is disposed on the base member 40, and the male fitting 18 is fixed to the segment 12. The insert joint 26 shown in FIG. 2 can be manufactured using various materials, such as stainless steel, soft iron, cast iron, or high speed steel. In addition, it is possible to embed the expansion bracket into the segment using any known method.

  FIG. 3 is a view showing a state in which the slide lock joint used in the present invention is connected as a cross section along the direction of the tunnel axis Ta in FIG. In the slide lock joint 46 shown in FIG. 3, the male fitting 16 and the female fitting 22 are fitted to generate a fastening force. The male fitting 16 includes a connecting projection 50 provided with an extended portion 48 and a base 52 that holds the connecting projection 50 movably in the vertical and horizontal directions on the paper surface. The connection protrusion 50 is inserted into an opening 54 having a diameter larger than that of the connection protrusion formed on the base 52, and a screw is provided on the side of the connection protrusion 50 facing the expansion portion 48. Is held movably. An elastic member 58 is disposed between the base 52 and the holding metal member 56, and a circumferential protrusion 60 is formed along the opening 54. The elastic member 58 provides flexibility in holding the connection protrusion 50 by the holding metal piece 56. In addition, although the expansion part 48 and the connection protrusion 50 can use the bolt formed integrally, it can also be set as the member produced specially for the objective of this invention.

  Further, the circumferential protrusion 60 generates a localized stress around the opening 54 at the time of fastening, and firmly generates a fastening force with the female fitting 22 when the fastening is completed regardless of the presence of the elastic member 58. I am letting. An anchor bar 36 is connected to the base 52, and the male fitting 16 is fixed to the segment. In the present invention, the male metal fitting 16 of the slide lock joint is not necessarily required to have the configuration shown in FIG. 3, and any male metal fitting including at least the connecting protrusion 50 and the extended portion 48 may be used. The male member of the slide lock type joint having any known configuration can be used, and the shape of the extension portion can be any known shape.

  The female fitting 22 shown in FIG. 3 generally includes a fastening member 64, and the fastening member 64 includes a slot 68 extending in a direction perpendicular to the paper surface. The slot 68 accommodates the connection protrusion 50 of the male fitting 16 and engages the back surface 70 of the fastening member 64 with the extended portion 48 of the connection protrusion 50 to generate a fastening force. The female fitting 22 includes a connection protrusion accommodating portion 72 connected to the fastening member 64, and the connection protrusion accommodating portion 72 connects an anchor bar 36 and an anchor bar 36 for fixing the female member 22 to the segment. An accommodating space 62 for accommodating the extension 48 is secured during the manufacture of the segment. The fastening member 64 and the connection protrusion accommodating portion 72 can be formed by welding the respective members to each other, or can be manufactured integrally by casting or the like. Further, the shapes of the fastening member 64 and the connecting projection receiving portion 72 are not limited to the embodiment shown in FIG. 3 as long as the operation and effect of the present invention are exhibited, and the embedding in the segment has been performed so far. Any known method can be used.

  FIG. 4 is a front view of the fastening member 64 of the female fitting used in the present invention. As shown in FIG. 4, the fastening member 64 has a slot 68 formed in the center and continuous with both ends of the slot, and the extended portion 48 of the connecting protrusion 50 faces the base (not shown) of the female fitting 22. Are provided with openings 74 and 76 to be passed. In the present invention, the openings 74 and 76 are formed at both ends of the slit, so that the expansion portion 48 can be inserted into the coupling protrusion accommodating portion 72 from both directions with respect to the female fitting, and the fastening force only from one direction. The direction in which the fastening force is generated can be expanded to the maximum with respect to the conventional slide lock type joint that only allowed. For this reason, the joint between rings of the present invention enables fastening regardless of the direction in which the fastening force is applied, expands the working direction of the erector, and improves the connection efficiency by the erector.

  FIG. 5 is a view showing a part of the step of engaging the extended portion 48 of the connecting protrusion 50 with the fastening member 64 used in the present invention as a cross section taken along the cutting line AA of FIG. As shown in FIG. 5, the fastening member 64 used in the present invention is provided with a taper that is thicker along the central direction of the female fitting 22, and is thickest in the vicinity of the central portion of the fastening member 64. A taper surface extending from both sides continuously forms a protrusion 66 at a substantially central portion of the fastening member 64. In the fastening work of the slide lock joint of the present invention, after the connecting projection 50 of the male metal fitting is inserted into the opening 76, it is moved in the direction of the arrow by an erector (not shown), so that the extension 48 Engages with the back surface 70 of the fastening member 64 to generate a fastening force.

  FIG. 6 is a view showing another embodiment of the joint provided in the shield segment of the present invention. In the embodiment shown in FIG. 6, the extended portion 48 of the connection protrusion 50 is formed with a notch 78 having a tapered surface that matches the tapered surface formed on the fastening member 64. The contact surface with the taper surface of the fastening member 64 is enlarged as compared with the embodiment. In the embodiment shown in FIG. 6, the fastening work inserts the extended portion 48 of the connecting protrusion 50 along the direction of the arrow B with the extended portion 48. The notch 78 of the extended portion 48 abuts against the tapered surface of the fastening member 64 at an appropriate position of the fastening member 64 to generate a fastening force. In the embodiment shown in FIG. 6, since the contact surface is enlarged, for example, even when a displacement is applied due to an earthquake after construction, the segment is more robust against the shear stress acting in the lateral direction of the paper. Can be concluded.

  FIG. 7 is a view showing still another form of the joint provided in the shield segment of the present invention. In the embodiment shown in FIG. 7, the concave portions 80 are formed on both sides of the ridge 66 formed in the central portion of the fastening member 64 so as to be able to accommodate the extended portions 48 of the connecting projection 50. In the embodiment shown in FIG. 7, the fastening work of the slide lock type joint proceeds to the center portion of the fastening member 64 as the connecting protrusion 50 is inserted along the arrow B, and the extended portion of the connecting protrusion 50 48 reaches the recess 80. The recess 80 accommodates the extended portion 48 and provides surface contact to generate a stable fastening force. In the embodiment shown in FIG. 7, as in the embodiment described in FIG. 6, the extended portion 48 is reliably positioned by the concave portion 80, and is more robust against the lateral displacement stress due to an earthquake or the like. It is possible to connect segments.

  FIG. 8 is a diagram showing an embodiment of the shield method of the present invention. FIG. 8A shows the arrangement when viewed in the direction of the tunnel axis Ta, and FIG. 8B shows the arrangement when viewed from the direction crossing the tunnel axis Ta. As shown in FIG. 8A, adjacent segments 12 and 20 forming a ring are connected by an insertion joint 26 and can be connected only by a pressing force centered on the tunnel axial direction by an erector. In the fastening process of the present invention, as shown in FIG. 8B, first, the connecting projection 50 of the male fitting of the segment 12 is positioned in the opening 76 of the female fitting 22 of the segment 82 and the segment 84.

  At this position, the connecting projection 50 of the male fitting of the insertion joint 26 can be freely inserted into the opening 76 of the female fitting, so that almost no pressing force is required in the direction of the arrow C. It can be positioned by an erector (not shown) to a position where the joint 26 can be inserted. Thereafter, a pressing force is applied by an erector along the arrow D, and the connection of the insertion type joint 26 and the connection of the slide lock type joint are simultaneously performed. For this reason, it is not necessary to configure the shield by two steps of positioning the segments between the erectors and activating the shield jacks to join the rings, so that a shield with sufficient strength can be constructed with the erectors. The workability behind the cutter chamber can be significantly improved. Furthermore, since the slide lock type joint is used as the inter-ring joint, the fastening strength in the tunnel axis direction can be further improved. Furthermore, despite the use of a slide lock type joint, the direction in which the fastening force is applied is not limited, and the slide lock type joint can be joined from both the left and right directions, improving the workability of the erector. it can.

  FIG. 9 shows an embodiment of a shield tunnel constructed using the shield method of the present invention. FIG. 9A is a front view of the shield machine 86, and FIG. 9B is a cross-sectional view of the shield machine 86. As shown in FIGS. 9A and 9B, a plurality of cutter bits 90 are disposed on the cutter face 88 of the shield machine 86. The cutter face 88 rotates about a central axis (not shown), excavates the rock, and extends the tunnel. With reference to FIG. 9B, the inside of the shield machine 86 will be described. A cutter chamber 92 and a work space 96 are formed behind the cutter face 88.

  An operator room is provided at an appropriate position of the work space 96 in the construction method, and the operation of the shield machine 86 is managed. The cutter chamber 92 is provided with a driving device for rotating the cutter face 88. Further, in the embodiment shown in FIG. 9, a screw conveyor 94 for discharging excavated soil is disposed in the cutter chamber 92, and the excavated soil is conveyed rearward. In the present invention, a mud shield method using a mud shield machine provided with a mud pipe and a mud pipe for supplying and discharging mud can also be used. In this case, the excavated soil is discharged using a mud pipe and a mud pipe (not shown).

  An erector 98 is disposed in a work space 96 formed behind the cutter chamber 92. The erector 98 transports the segment 100 using the robot arm 102 and positions the segment 100 at an appropriate position. The erector 98 includes a moving device 104, which positions the segment 100 with respect to the segment 106 that has already formed part of the tunnel and then moves it in the fastening direction to complete the fastening of the segment 100.

  In the present invention, since the connection between the segments and the rings is completed only by the operation of the erector 98, it is possible to remarkably improve the segment connection efficiency, and at the same time, the shield strength near and immediately after the erector 98 is improved immediately after the fastening process. As a result, construction efficiency can be improved. Moreover, construction efficiency can be improved by improving the workability of the erector.

  Although the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments shown in the drawings, and the materials, dimensions, and arrangements of the joints used in the present invention are not limited thereto. Further, the shape and size of the details are included in the scope of the present invention within the scope of the effects of the present invention. In addition, the shield segment provided with the inter-ring joint of the present invention and the shield segment provided with the conventional inter-ring joint may be appropriately used according to the tunnel strength in the tunnel axial direction, the ground strength at the time of construction, and the like. it can.

  As described above, the present invention remarkably improves the workability of the shield tunnel, and can increase the usability of the shield tunnel by improving the shield tunnel construction period, construction cost, and work space safety. It is an excellent invention.

The perspective view which showed the shield tunnel using the shield segment provided with the joint between rings of this invention. The figure which showed embodiment of the insertion type coupling which is an insertion type coupling used for this invention. The figure which showed the state to which the slide lock type joint used for this invention was connected as a cross section along the tunnel axis | shaft Ta direction of FIG. The front view of the fastening member of the female metal fitting used for this invention. The figure which made the fastening member used by this invention a cross section along the cutting line AA of FIG. 4, and showed the state which the expansion part of a connection protrusion engages. The figure which made the fastening member used by this invention a cross section along the cutting line AA of FIG. 4, and showed the state which the expansion part of a connection protrusion engages. The figure which made the fastening member used by this invention a cross section along the cutting line AA of FIG. 4, and showed the state which the expansion part of a connection protrusion engages. The figure which showed embodiment of the shield construction method of this invention. The figure which showed embodiment of the shield tunnel constructed | assembled using the shield construction method of this invention.

Explanation of symbols

10 ... Shield tunnel 12 ... Segment 14 ... Ring 16 ... Male fitting (slide lock joint)
18 ... Male fitting (insertion type joint)
20 ... Segment 22 ... Female fitting (slide lock joint)
24 ... Female fitting (insertion type joint)
26 ... Insertion type joint 28 ... Holder metal fitting 30 ... Backup metal fitting 32 ... Lock member 34 ... Opening 36 ... Anchor bar 38 ... Bar member 40 ... Base member 42 ... Stopper member 42
44 ... Notch 46 ... Slide lock type joint 48 ... Expansion part 50 ... Connection protrusion 52 ... Base part 54 ... Opening 56 ... Holding bracket 58 ... Elastic member 60 ... Circumferential protrusion 62 ... Storage space 64 ... Fastening member 66 ... Projection 68 ... Slot 70 ... Back surface 72 ... Connecting projection receiving part 74 ... Opening part 76 ... Opening part 78 ... Notch 80 ... Recess 82 ... Segment 84 ... Segment 86 ... Shield machine 88 ... Cutter face 90 ... Cutter bit 92 ... Cutter chamber 94 ... Screw conveyor 96 ... Work space 98 ... Elector 100 ... Segment 102 ... Robot arm 104 ... Moving device 106 ... Segment 108 ... Shield jack

Claims (8)

A slide lock type ring-to-ring joint used for shield segments,
A female fitting provided with a coupling protrusion accommodating portion and a fastening member;
A male fitting with a connecting projection with an extension,
The fastening member includes a slot extending in a circumferential direction of a segment and narrower than a diameter of the extension portion, and a plurality of openings formed on both sides of the slot to accommodate the extension portion of the connection protrusion. The surface which contacts the said expansion part is a joint between rings provided with the taper which thickens the thickness of the said fastening member along the said slot from these opening.   The inter-ring joint according to claim 1, wherein the extension includes a notch having a taper having an angle that fits the taper.   The inter-ring joint according to claim 1, wherein the surface that comes into contact with the extension portion includes a recess that accommodates the extension portion.   A shield segment provided with the joint between rings of any one of Claims 1-3, and the insertion type joint for connecting between segments in the circumferential direction centering on a tunnel axis | shaft. A shield construction method using a shield segment comprising the joint between rings according to any one of claims 1 to 3 and an insertion joint for connecting between segments,
The step of positioning the inter-ring joint of the shield segment according to any one of claims 1 to 3 adjacent to the inter-ring joint of the segment adjacent in the tunnel axial direction adjacent to the segment adjacent to the tunnel axial direction. When,
Applying a pressing force in a direction to shorten the distance between the segment adjacent to the tunnel circumferential direction and the shield segment.   The positioning step includes a step of positioning the plurality of slide lock joints of the shield segment so as to engage with the slide lock joints of the plurality of segments adjacent to each other in the tunnel axis direction and circumferentially adjacent to each other. The shield construction method according to claim 5.   The step of applying the pressing force includes a step of bringing a tapered surface formed in the extended portion into contact with a tapered surface of the fastening member, or a step of fitting the extended portion into a concave portion formed in the fastening member. The shield construction method according to claim 5 or 6.   A shield tunnel constructed by connecting a plurality of shield segments according to claim 4 in a tunnel circumferential direction and a tunnel axial direction.

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