JP5327034B2 - segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a segment which eliminates the need of increasing the thickness of joint plates. <P>SOLUTION: In this segment 1, the joint plates 9 are disposed at the circumferential ends of at least two girders 2 and fixed to the girders 2, respectively. The segment includes connection parts 4 for any of the joint members fixed to the joint plates 9 or bolt holes formed therein. The girder 2 includes a web 7 and flanges 8 joined to the web 7. A groove-like part is formed by the web 7 and the flange 8 of the girder 2 when the girder 2 is projected to the joint plate 9 side. The positions of the connection parts 4 provided to the joint plate 9 in the lateral direction of the joint plate 9 are set so that the centers of gravity of the joint members 12, 13 or the center axes of the bolt holes are positioned in the groove-like part. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a segment used when a tunnel or the like is constructed by a shield method or the like.

  2. Description of the Related Art Conventionally, a segment is known in which a joint member provided on a joint plate is provided at a position away from a main girder in the tunnel axis direction (joint plate width direction) (see, for example, Patent Document 1).

JP 2005-351535 A

For example, as shown in FIGS. 20 to 22 (a) and 22 (b), the joint member fixed to the joint plate in order to connect the segments adjacent to each other in the tunnel circumferential direction is a distance from the main beam 2 in the tunnel axis direction. When it is assumed that they are arranged on the joint plate 9 at a position L apart, the segments 26 adjacent in the tunnel circumferential direction are joined together by the joint member 12 (13) or a joining bolt. Therefore, the tensile force acting between the joint members 12 (13) or the joining bolt is transmitted to the main girder flange 8 which is the main structural part of the main body of the segment 26 via the joint plate 9. When the plate thickness (t1) is small and the bending rigidity is low, the joint plate 9 is greatly bent in the circumferential direction of the tunnel as shown by a two-dot chain line a in FIG. 22A or a two-dot chain line in FIG. In order to increase the amount of openings between adjacent segments in the circumferential direction of the tunnel and cause a problem in the water stop performance of the joint, as shown in FIG. t2) must be extremely thick to increase the rigidity of the joint. Therefore, in particular, in the wide segment in which the width dimension in the tunnel axis direction of the joint plate 9 is widened, there is a problem that the amount of steel material used increases as the plate thickness of the joint plate 9 increases, and the cost of the segment increases. It was.
Therefore, it is possible to remarkably reduce the burden of the bending force acting on the joint plate 9 without increasing the thickness t of the joint plate 9 having a large tensile load in the circumferential direction of the tunnel. 12 (13) and other segments where the connecting portion 4 is provided efficiently, thereby reducing the amount of steel used for the joint plate 9 and transmitting the tensile force acting on the joint plate 9 to the main beam 2 Is desired.
An object of the present invention is to provide a segment that does not need to increase the thickness of the joint plate by skillfully incorporating the arrangement position of the coupling portion such as the joint member with respect to the joint plate in consideration of the main beam. .

In the segment of the first invention, the joint plate is arranged over the circumferential ends of at least two main girders and fixed to the main girder, and either the joint member fixed to the joint plate or the provided bolt hole In the segment provided with the connecting portion, each main girder includes a web and at least two flanges connected to the web, and a reinforcing member having one end fixed to the joint plate in the segment is parallel to the main girder. And a portion formed by a web and a flange in the main girder, which is directly or indirectly fixed to the main girder and projected onto the joint plate side, and a portion formed by a reinforcing member projected on the joint plate side a closed loop portion is formed by, the connecting portion is the joint plate width direction position provided for joint plate is positioned a central axis of the center of gravity or the bolt hole of the joint member into said closed annular portion The other end side of the reinforcing member is embedded and fixed in the concrete filled inside the steel shell in the segment, and the flange in the main girder is a natural mountain side flange or an inner space side flange, and the natural mountain side When a line connecting the tip in the tunnel axis direction of the flange and the tip in the tunnel axis direction of the inner flange is projected onto the joint plate side, the projected joint plate side line or a portion of the joint plate in the vicinity of the line A reinforcing member is connected to the base plate .
The segment of the second invention is characterized in that, in the segment of the first invention, the reinforcing member is connected to the tip of the natural mountain side flange and the tip of the inner space side flange.
The segment of the third invention is characterized in that, in the segment of the first or second invention, the reinforcing member is either a plate-like member or a rod-like member.
In the segment of the fourth invention , in any of the segments of the first to third inventions, the reinforcing member is connected to a reinforcing rib adjacent to the joint plate.
In segment of the fifth invention, in the first to any segment of the fourth aspect of the present invention, the inner space side flanges, and having a notch in the bolt joint.
The segment of the sixth invention is characterized in that, in any of the segments of the first to fifth inventions , the cross section of the main girder is either I-shaped or C-shaped.
In the segment of the seventh invention , in any of the segments of the first to fifth inventions , the main girder section is L-shaped.
The segment of the eighth invention is characterized in that, in any of the segments of the first to seventh inventions, a slip prevention member is installed inside the steel shell in the segment.
The segment of the ninth invention is characterized in that, in the segment of the eighth invention, the displacement preventing member provided on the flange is a rod-like member installed across the main girders.

According to the first invention, each main girder includes a web and at least two flanges connected to the web, and the reinforcing member is arranged in parallel to the main girder and fixed directly or indirectly to the main girder. Therefore, when the main girder and the reinforcing member are projected on the tunnel circumferential joint plate side, a rectangular or trapezoidal closed annular portion can be formed, and the connecting portion such as the joint member to the joint plate is provided in the tunnel axial direction. Since the position in the width direction of a certain joint plate is such that the center of gravity of the joint member or the central axis of the bolt hole is located in the closed annular portion, the portion of the joint plate located in the closed annular portion is two pieces in the main girder. The joint and the reinforcing member of the flange plate and the web on the side of the joint plate are restrained, and the rigidity of the joint plate is improved more efficiently than in the case of the U-shaped groove portion. Become. By providing a connecting part such as a joint member on the joint plate in that range, the tensile force acting on the joint plate can be more efficiently transmitted to the flange or web of the main girder without increasing the thickness of the joint plate. The effect that it can do is acquired.
The flange in the main girder is a natural ground side flange or inner space side flange, and a line connecting the tip of the ground surface side flange in the tunnel axis direction and the inner space side flange in the tunnel axis direction is projected onto the joint plate side. In this case, since the reinforcing member is connected to the projected joint plate side line or the joint plate portion in the vicinity of the line, when the main girder and the reinforcing member are projected to the tunnel circumferential direction joint plate side, The position of the joint plate width direction, which is the tunnel axis direction in which the connecting portion of the joint member or the like is provided with respect to the joint plate, can be formed large in the shape or trapezoidal closed annular part, or the center axis of the joint member or the center axis of the bolt hole Is located in the closed annular portion, so that the portion of the joint plate located in the closed annular portion is surrounded by the joint portion on the joint plate side between the two flanges and the web in the main girder and the reinforcing member. Will be bound, it is possible to further improve the rigidity of the joint plate than in the groove portion of the U-shaped.
Further, in the segment, a reinforcing member having one end fixed to the joint plate is disposed in parallel with the main girder, and a groove-like portion formed by a web and a flange in the main girder that projects the main girder onto the joint plate side. And a portion of the reinforcing member projected onto the joint plate side forms a closed annular portion, and the joint plate width direction position where either the joint member or the bolt hole is connected to the joint plate is the joint member The other end side of the reinforcing member is embedded and fixed in the concrete filled inside the steel shell in the segment. Therefore, the reinforcement member fixed to the main girder and the filling concrete can provide an effect such as a segment with increased rigidity of the joint portion of the joint plate.
According to the second invention, since the reinforcing member is connected to the tip of the natural mountain side flange and the tip of the inner space side flange, the tensile force transmitted from the joint plate to the reinforcing member can be efficiently transmitted to the main beam, etc. An effect is obtained.
According to the third invention, since the reinforcing member is either a plate-shaped member or a rod-shaped member, when a commercially available steel plate, a reinforcing bar, a deformed steel bar, or a rod-shaped steel material is projected onto the joint plate in the tunnel circumferential direction, The joint plate can be reinforced by forming a U-shaped groove portion or a closed annular portion in cooperation with the girder.
According to the fourth invention, since the reinforcing member is connected to the reinforcing rib adjacent to the joint plate, the reinforcing member capable of reinforcing the joint plate can be installed even when the reinforcing member is not fixed to the main girder. In addition, when the main girder and the reinforcing member are projected from the tunnel circumferential direction to the joint plate side, a groove or a closed annular portion is formed on the joint plate, and the joint plate in the groove or the closed annular portion is reinforced. Thus, it is possible to increase the rigidity of the joint plate, and it is possible to transmit a tensile force to the main girder via the reinforcing member and the reinforcing rib.
According to the fifth aspect of the present invention, since the inner flange has a notch for bolt connection, even in a form in which no joint member is provided on the joint plate, by providing a recess connected to the notch, the tunnel circumferential direction For example, it is possible to connect adjacent segments to each other.
In the sixth invention, since the cross section of the main girder is either I shape or C shape, an inexpensive main girder can be formed by assembling a commercially available steel material or steel plate, and the main girder alone or the reinforcing member Together, when projected to the joint plate side in the tunnel circumferential direction, effects such as the ability to form a groove-like portion or a closed annular portion on the joint plate side are obtained.
In the seventh invention, since the cross section of the main girder is L-shaped, a commercially available steel material or steel plate can be assembled to form an inexpensive main girder, and the main girder alone or in combination with the reinforcing member, When projected in the direction on the joint plate side, effects such as the ability to form a groove-like portion on the joint plate side are obtained.
In the eighth aspect of the invention, since the slip prevention member is installed inside the steel shell in the segment, the circumferential displacement of the steel shell and the filling concrete is prevented, and the filling concrete and the steel shell are surely separated. Effects such as integration can be obtained.
In the ninth invention, in the segment of the eighth invention, when the displacement preventing member provided on the flange is a rod-like member installed between the main girders, the solidified concrete and the steel shell are reliably integrated. An effect such as being able to be achieved is obtained.

It is a partially cutaway perspective view which shows the segment of the composite structure for tunnel lining of 1st Embodiment of this invention. (A) is a front view of the segment shown in FIG. 1, (b) is a cross-sectional view showing the position of a connecting portion made of a joint member with respect to the main girder, and (c) is a cross-sectional plan view on one end side. It is explanatory drawing which shows the deformation | transformation state of a joint plate when tensile force acts on the position with respect to the joint plate of a connection part which consists of a joint member, and the connection part which consists of a joint member. It is a partially notched perspective view which shows the segment of the composite structure for tunnel lining of 2nd Embodiment of this invention. 4A is a front view of the segment shown in FIG. 4, FIG. 4B is a cross-sectional view showing the position of the connecting portion made of the joint member and the position of the connecting portion made of the reinforcing member with respect to the main girder, and FIG. It is a cross-sectional top view of the direction one end side. It is a partially cutaway perspective view which shows the segment of the composite structure for tunnel lining of 3rd Embodiment of this invention. (A) is a front view of the segment shown in FIG. 6, (b) is a cross-sectional view showing the position of the connecting portion and the position of the reinforcing member made of the joint member with respect to the main girder, and (c) is the tunnel circumferential one end side of the segment FIG. It is a partially cutaway perspective view which shows the segment of the composite structure for tunnel lining of 4th Embodiment of this invention. 8A is a front view of the segment shown in FIG. 8, FIG. 8B is a cross-sectional view showing the position of the connecting portion and the position of the reinforcing member made of the joint member with respect to the main girder, and FIG. FIG. It is a partially notched perspective view which shows the segment of the composite structure for tunnel lining of 5th Embodiment of this invention. 10A is a front view of the segment shown in FIG. 10, FIG. 10B is a cross-sectional view showing the position of the connecting portion including the bolt hole and the position of the reinforcing member with respect to the main girder, and FIG. FIG. FIG. 11 is a cross-sectional view taken along the main girder in the segment shown in FIG. 10 in order to show the bolt holes and bolt boxes provided in the joint plate and the openings provided in the flange on the inner space side. It is a perspective view which shows a part of segment of 6th Embodiment of this invention which shows the other arrangement | positioning form of a reinforcement member. It is a partially notched perspective view which shows the segment of the composite structure for tunnel lining of 7th Embodiment of this invention. 14A is a front view of the segment shown in FIG. 14, FIG. 14B is a cross-sectional view showing the position of the connecting portion and the position of the reinforcing member made of the joint member with respect to the main girder, and FIG. FIG. The segment of the composite structure for tunnel lining of 8th Embodiment of this invention is shown, Comprising: (a) is a front view of a segment, (b) is the position and reinforcement of a connection part which consist of a coupling member with respect to a main girder It is sectional drawing which shows the position of a member. When the main girder has a cross section of I shape or H shape, the segment of the composite structure for tunnel lining according to the ninth embodiment of the present invention is shown, (a) is a front view of the segment, (b) These are sectional drawings which show the position of the connection part which consists of a coupling member with respect to a main girder, and the position of a reinforcement member. When the main girder has an L-shaped cross section, it shows a segment of the composite structure for tunnel lining of the tenth embodiment of the present invention, wherein (a) is a front view of the segment, and (b) is the main girder. It is sectional drawing which shows the position of the connection part which consists of a coupling member with respect to, and the position of a reinforcement member. 18A is a front view of the segment shown in FIG. 18, FIG. 18B is a cross-sectional view showing the position of the connecting portion made of the joint member and the position of the reinforcing member with respect to the main girder, and FIG. FIG. The segment of the composite structure for the conventional tunnel lining is shown, Comprising: (a) is a front view of a segment, (b) is sectional drawing which shows the position of the connection part which consists of a coupling member with respect to a main girder. (A) is a front view of the segment shown in FIG. 20, (b) is sectional drawing which shows the position of the connection part which consists of a coupling member with respect to a main girder. (A) (b) is one of the segments showing the bending deformation when the joint plate is not a thick plate but a thin plate when a tensile force is applied to the connecting portion made of the joint member in the conventional segment shown in FIG. (C) is a plan view of a part of a segment showing a form in which the joint plate is a thick plate so that bending deformation does not occur in the joint plate as shown in FIG. It is. It is a partially notched perspective view which shows the segment of the composite structure for tunnel lining of 11th Embodiment of this invention. (A) is a front view of the segment shown in FIG. 25, (b) is a cross-sectional view showing the position of the connecting portion and the position of the reinforcing member made of a joint member with respect to the main girder. It is a partially notched perspective view which shows the segment for tunnel lining of 12th Embodiment of this invention. (A) is a front view of the segment shown in FIG. 25, (b) is a cross-sectional view showing the position of the connecting portion made of a joint member with respect to the main girder, and (c) is a cross-sectional plan view of one end side in the tunnel circumferential direction in the segment. . It is a cross-sectional top view which shows the segment edge parts adjacent to the circumferential direction. It is a cross-sectional top view which shows the state which connected the segments mutually.

    Next, the present invention will be described in detail based on the illustrated embodiment.

  1 to 3 show a segment 1 of a composite structure for tunnel lining according to a first embodiment of the present invention, and FIG. 1 is a partially cutaway perspective view of the segment 1, FIG. 1 is a front view of the segment 1 shown in FIG. 1, FIG. 2B is a cross-sectional view showing the position of the connecting portion 4 made of the joint members 12 and 13 with respect to the main girder 2, and FIG. 3 shows the connecting portion 4 made of the joint member. It is explanatory drawing which shows the deformation | transformation state of the joint board 9 when a tensile force acts on the position with respect to the joint board 9, and the joint member 12. FIG.

  The illustrated form shows the composite segment 1 in which the filling concrete 5 is filled and hardened in the segment, and the steel shell 6 and the filling concrete 5 are combined and integrated. The segment 1 may be a steel segment in which the filling concrete 5 is not filled in the segment, or a segment in which the filling concrete 5 is filled and hardened in the segment. The same applies to the following embodiments.

  In this embodiment, the steel main girder 2 arranged to extend in the circumferential direction of the tunnel in the segment 1 is connected to the web 7 arranged to extend in the circumferential direction of the tunnel and the web 7. A main girder 2 having a C-shaped cross section (including a U-shaped cross section, a cross-sectional groove shape, or a cross-section recessed shape) having a flange 8 integrally fixed to the web 7 on one side (tunnel shaft). This is a segment 1 having a single-flange type main girder 2 provided so as to project to one side of the direction).

  In the form shown in FIGS. 1 to 3, the main girder 2 is composed of a web 7 and each flange 8 on the ground mountain side and the tunnel inner side provided integrally with the web 7. Two joints, one ground plate skin plate 3 and two joints arranged at both ends in the tunnel axial direction and fixed integrally by welding to the main girder 2 and the natural skin side skin plate 3 The plate 9 constitutes a five-sided steel shell 6. Further, steel reinforcing ribs 11 are provided in the steel shell 6 between the main girders 2 at intervals, and a male joint 12 or a female joint 13 is suitably provided on the joint plate 9 and the main girder 2, A steel segment 1 is formed, and a synthetic structure segment 1 in which the steel segment 1 is filled and hardened with the filling concrete 5 and the steel segment 1 and the filling concrete 5 are integrated with each other. Has been.

  In the segment 1 of the present invention, at least one pair of main girders 2 (2) having one web 7 and at least one flange 8 (a ground-side flange or an inner-side flange) fixed to the web 7. A segment 3 having a main girder 2), preferably a skin plate 3 on one or both of the natural ground side and the inner air side, which is the inner side surface of the segment of the web 8. Thus, the base end side of the flange 8 is integrally connected to the web 7. In the illustrated form, the main girder 2 is formed in a form in which the web 7 and the flange 8 are integrally connected to each other. However, the flange 8 is assembled to the web 7 by welding W continuous in the tunnel circumferential direction. The main digit 2 may be used (see FIG. 13).

In the segment 1 of the present invention, the joint plate 9 is disposed and fixed to the main beam 2 over the circumferential end portions of at least two main girders 2, and the joint members 12, 13 or bolt holes 10 ( The connection part 4 which consists of FIG. 10-12 is provided, and the segment 1 joined is made into object. In such a segment 1, each main girder 2 includes a web 7 and a flange 8 connected to the web 7, and when the main girder 2 is projected on the joint plate 9 side from the tunnel circumferential direction, the main girder 2 The groove 7 (see FIG. 2 a) is formed by the web 7 and the flange 8, and the position in the joint plate width direction where the connecting portion 4 is provided with respect to the joint plate 9 is the center of gravity or bolt of the joint members 12, 13. The central axis of the hole 10 is provided so as to be located in the groove-like portion 15.
The joint members 12 and 13 may be fixed to the joint plate 9 by welding, or the female joint member 13 having a locking recess may be provided integrally with the joint plate 9. The female joint member 9 side joint plate 9 is provided with an inverted T-shaped opening, and the joint member 13 is provided on the back side of the joint plate 9.
Therefore, in this invention, it provides so that the gravity center of the connection part 4 which consists of the joint members 12 and 13 provided in the joint board 9 may be located in the said groove-shaped part 15 (or closed annular part 16 in embodiment mentioned later). There are two cases, that is, a case where the central axis of the bolt hole 10 is provided so as to be located in the groove-like portion 15 (or a closed annular portion 16 in the embodiment described later).
Therefore, the joint members 12 and 13 or a part of the connecting portion 4 of the bolt hole 10 may protrude from the groove-like portion 15 or the closed annular portion 16.

  In the form shown in FIGS. 1-3, it is set as the segment 1 of the form provided with the flange 8 located in the tunnel radial direction natural ground side in the web 7, and the flange 8 located in the tunnel inner space side.

  In the present invention, attention is paid to the cross-sectional shape of the main girder 2 as described above, and the cross-sectional shape is used to remarkably increase the bending rigidity of the joint plate 9 in the portion where the connecting portions 4 such as the joint members 12 and 13 are provided. We are focusing on the points that can be used effectively.

When the cross-sectional form of the main girder 2 is projected on the joint plate 9 side as viewed from the tunnel circumferential direction, in the case of FIGS. 1 to 3, the web 7 of the main girder 2 and the two flanges A C-shaped (U-shaped) groove-like portion 15 is formed on the inner side of the segment. When the cross-sectional shape of the main girder 2 is projected, the bending rigidity of the portion of the joint plate 9 is increased. The joint members 12 and 13 are installed at predetermined positions on the joint plate 9 so that the center of gravity of the joint members 12 and 13 is located in the groove-like portion 15 when viewed from the circumferential direction of the tunnel. .
By locating the position of the center of gravity of the connecting portion 4 composed of the joint members 12 and 13 projected from the circumferential direction of the tunnel to the joint plate 9 side at the position as described above, it is adjacent to the circumferential direction of the tunnel via the joint members 12 and 13. When transmitting the tensile force F between the segments 1 (see FIG. 3), stress is transmitted at a position where the joint plate 9 in the groove portion 15 is reinforced and the bending rigidity is increased. The joint members 12 and 13 and the joint plate 9 can be efficiently transmitted to the flange 8 or the web 7 of the main girder 2, and in order to increase the bending rigidity of the joint plate 9, the thickness of the joint plate 9 is increased. It is considered as economic segment 1.
In addition, since the position from the main girder 2 where the joint members 12 and 13 are provided (tunnel axial direction or tunnel radial direction) is zero as viewed from the circumferential direction of the tunnel, the tunnel from the main girder 2 as in the prior art. Since the bending force acting on the joint plate 9 provided at a position separated in the axial direction does not act, the segment 1 is advantageous.
Therefore, the bending deformation in the tunnel radial direction as shown by the two-dot chain line a in FIG. 3 or the bending deformation in the tunnel axis direction as shown by the two-dot chain line b in FIG. , 13 (connecting portion 4) to the flange 8 is short as indicated by a thick arrow, so that stress can be efficiently transmitted from the joint plate 9 to the flange 8 and also transmitted to the web 7. Can do.
In addition, the connecting portion 4 composed of the joint members 12 and 13 is located in a short position from the flange 8 and the web 7 of the main girder 2 and in the groove-like portion 15 when the main girder flange 8 and web 7 are projected on the joint plate side. Since the portion where the flange 8 and the web 7 of the main girder 2 are fixed to the joint plate 9 side is surrounded by the groove-like portion 15 when projected to the joint plate side, the joint plate 9 is provided. The joint plate around the connecting portion 4 is reinforced, and even if a tensile force in the tunnel circumferential direction acts on the joint plate 9, the deformation of the joint plate is small and the stress generated in the joint plate is small. It is no longer necessary to thicken.
The joint members 12 and 13 may be a male joint member 12 having a T-shaped cross section having a locking projection, and a female joint member having an insertion hole for a male joint member and a locking recess connected thereto. 13 is also acceptable. As the male or female joint members 12 and 13 as described above, known members may be used as appropriate.
The same applies to the following embodiments, but in such a configuration, the deformation amount and bending moment of the joint plate 9 when the tensile force F in the circumferential direction of the tunnel is applied are extremely small as compared with the conventional case. Furthermore, without increasing the thickness of the joint plate, it is possible to reduce the amount of openings between adjacent segments in the tunnel circumferential direction and to ensure good water stop performance of the joint portion. Further, since the distance between the connecting portion 4 and the flange 8 or the web 7 of the main girder 2 is small, the tensile force F acting on the joint plate 9 can be efficiently and reliably transmitted to the flange 8 or the web 7 of the main girder 2. And good joint structure performance can be secured. In the figure, illustration of a water stop groove or a water stop material provided in the joint plate 9 or the web 7 is omitted.

Although the said form has shown as a typical form at the time of providing the joint members 12 and 13 in the joint board 9, in this invention, the segment 1 has the form other than the form which provides the joint members 12 and 13 in the joint board 9. The same is true for the form in which the bolt holes for inserting the bolts are provided in the joint plate 9. Such a form will be briefly described with reference to FIGS. 10 to 12.
If it demonstrates with reference to 5th Embodiment of FIGS. 10-12 instead of the form which provides the joint members 12 and 13 in the joint board 9, you may make it the connection part 4 which consists of the bolt hole 10 in the joint board 9. FIG. . In the case of the bolt hole 10, the central axis of the bolt hole 10 is positioned in the groove-like portion 15 in the circumferential direction of the tunnel. Stress is transmitted at a position where the joint plate 9 is reinforced and the bending rigidity is increased, so that the joint bolt 9 and the joint plate 9 can efficiently transmit the stress to the flange 8 or the web 7 of the main girder 2. In addition, in order to increase the bending rigidity of the joint plate 9, the economical segment 1 can be formed without increasing the thickness of the joint plate 9.

  In the present invention, when viewed from the circumferential direction of the tunnel, in particular, the web 7 and the flange when the cross-sectional form of the end portion of the main girder 2 of the portion joined to the joint plate 9 by welding is projected to the joint plate 9 side. For example, in the case of a groove inside the L-shaped portion formed by the web 7 and the flange 8, the shape of the groove-shaped portion 15 formed by the web 8 is preferably formed by the web 7 and the two flanges 8. There is also a case of a groove inside the inverted U shape (indented shape). When the number of the flanges 8 is one, it is a groove-like portion formed by either the flange from the natural ground side or the flange 8 from the innermost side and the web 7, and preferably the flange 8 is In the case of two or more sheets, it is a groove-like portion formed by the flange from the most natural ground side, the flange 8 from the innermost side, and the web 7.

  Next, the basic technical idea of the present invention will be described with reference to FIG. 3 or FIG.

When a tensile force in the tunnel circumferential direction is applied to a segment ring configured by connecting adjacent segments in the tunnel circumferential direction due to earth pressure or internal pressure, the adjacent segments 1 in the tunnel circumferential direction are The joint plate 9 is transmitted to the main girder 2 through the joint plate 9 from the connecting portion 4 composed of the joint members 12 and 13 that connect the joint plates 9 together. Or, it is transmitted to the main girder 2 through the joint plate 9 from the bolt and nut provided in the connecting portion 4 including the bolt hole 10. Therefore, a tensile force acts on the joint plate 9 from the bolts and nuts of the joint members 12 and 13 or the bolt holes 10 (in the case of FIGS. 10 to 12) on the outer side in the tunnel circumferential direction. The bending force acts as described in the prior art in FIG.
When the connecting member 4 including the joint members 12 and 13 or the bolt hole 10 is located farther away from the main girder 2 in the tunnel axial direction, a tensile force acts between the adjacent segments 1 in the tunnel circumferential direction. Since a tensile force acts on the joint members 12 and 13 (or joint members such as bolts) joining (connecting) the joint plates 9 of the segments adjacent to each other in the direction, A bending force around the main girder 2 acts, and the bending load on the joint plate 9 increases.

On the other hand, considering the cross section of the main girder 2 when viewed from the tunnel circumferential direction, the main girder 2 always includes a web 7 extending in the tunnel radial direction.
A flange 8 is provided so as to be connected to the web 7 so as to project in the tunnel axial direction on the inner side of the tunnel radial direction (or on the ground side of the tunnel radial direction) extending in the circumferential direction of the tunnel. In this case, when the main girder cross section is projected onto the joint plate 9 as viewed from the tunnel circumferential direction, the web 7 and the flange 8 form a substantially triangular or U-shaped (or C-shaped) groove. The joint plate 9 of the portion where the main girder 2 is fixed has the bending rigidity of the joint plate 9 increased in the vicinity of the fixed portion.
When viewed from the tunnel circumferential direction, the cross section of the main girder when the main girder 2 is projected in the vicinity of the portion where the rigidity of the joint plate 9 is enhanced as described above, particularly from the tunnel circumferential direction to the joint plate 9 side. In the case of a U-shaped cross-section, a H-shaped cross-section, etc., a groove portion 15 such as a triangle or a rectangular U-shape is formed by the web 7 of the main girder 2 and the flange 8 of the main girder 2, In the groove portion 15,
In particular, the rigidity of the joint plate 9 is increased. As the position away from the groove portion in the tunnel axis direction, the portion is not reinforced by the main girder, so the rigidity of the joint plate is lower at the center of the tunnel axis direction than the main girder side. .

In the present invention, when the groove portion is formed by the cross-sectional form of the main girder 2 when the main girder 2 is projected from the tunnel circumferential direction to the joint plate 9 side, The joint member is provided on the joint plate so that the center of gravity of the joint member is positioned in the groove-shaped portion. In this way, when a tensile force acts in the tunnel circumferential direction, the tensile force in the tunnel circumferential direction is rationally applied to the main girder from the position where the bending rigidity of the joint plate is increased. To be able to communicate.
The center of gravity of the joint members 12 and 13 is preferably located on or near the central axis of the joint members 12 and 13 in the tunnel circumferential direction when viewed from the tunnel circumferential direction. By disposing the connecting portions 4 such as the joint members 12 and 13 at the positions as described above, when the joint plate 9 receives a tensile force from the joint members 12 and 13, the joint plate 9 moves outward in the tunnel circumferential direction. The resistance in the case of deformation is increased, and the deformation in the outer circumferential direction of the segment 1 is restricted.

  Further, the cross-sectional form when the main girder 2 is cut in the tunnel axis direction may be a cross-sectional groove shape (substantially cross-sectional U-shape) as in the first embodiment, and is shown in FIG. 17 as the ninth embodiment. As shown, it may be a main girder cross-sectional shape having an I-shaped cross section (or a cross-sectional H-shaped form). In addition, when the cross-sectional form of the main girder 2 is a substantially cross-sectional L shape or a main girder cross-sectional form provided with a groove, the main girder 2 can be provided by installing a reinforcing member in parallel with or directly to the main girder 2. And the reinforcing member jointly form a substantially cross-sectionally concave (substantially cross-sectional U-shaped) groove-like portion or a substantially cross-sectional closed annular portion, and when projected onto the joint plate 9 side, the cross-sectionally concave shape (substantially substantially A groove-like portion having a substantially U-shaped cross section or a substantially cross-sectionally closed annular portion can be formed, and in the following embodiments, these forms will be sequentially described.

In the present invention, the bending rigidity of the portion of the joint plate 9 on which the joint members 12 and 13 are provided is enhanced by the main girder 2. Therefore, in the present invention, even if the filled concrete 5 in the segment 1 is provided. It may or may not be provided. If the intermediate filling concrete 5 is provided, the joint members 12 and 13 are prevented from coming out from the intermediate filling concrete 5 of the joint members 12 and 13 and the reinforcing member 17 by adhering to the anchor legs 18 or the reinforcing members 17. The resistance of the joint plate 9 is increased. The same applies to the following embodiments.
In order to connect the segments 1 adjacent to each other in the tunnel axis direction, the main girder 2 located at both ends of the segment 1 in the tunnel axis direction is provided with a joint 20 in the tunnel axis direction.

(Second Embodiment)
4 and 5 show the segment 1 of the second embodiment of the present invention. 4 is a partially cutaway perspective view showing a segment of a composite structure for tunnel lining according to a second embodiment of the present invention, FIG. 5A is a front view of the segment shown in FIG. 4, and FIG. Sectional drawing which shows the position of the joint member with respect to the main girder, and the position of a reinforcement member, FIG.5 (c) is a cross-sectional top view of the tunnel circumferential direction one end side in a segment.

  The second embodiment is mainly different in that a reinforcing member 17 made of a substantially rectangular or fan-shaped steel plate 21 is provided on the joint plate 9, and the other structure is the same as that of the segment 1 of the first embodiment. Therefore, like parts are denoted by like reference numerals, and different points will be mainly described.

In the form shown in FIGS. 4 and 5, the proximal end portion of the reinforcing member 17 in the circumferential direction of the tunnel is fixed to the joint plate 9 by welding or a bolt, which is disposed at a position close to the distal end portion of each flange 8 in the main girder 2. ing. The reinforcing member 17 is fixed by welding one side or both sides as appropriate. The reinforcing member 17 is smaller than the width of the joint plate 9 in the tunnel radial direction. The reinforcing member 17 increases the bending rigidity of the joint plate 9 in the vicinity where the reinforcing member 17 is provided, and the reinforcing member 17 restrains deformation of the joint plate 9.
When the reinforcing member 17 is fixed with a bolt, an attachment piece having a bolt hole is appropriately fixed and fixed to the joint plate 9 or the main girder 2 or the reinforcing rib 11 with a bolt or the like. A female screw member may be appropriately fixed to the 2 or the reinforcing rib 11 side.
The reinforcing member 17 is disposed so as to extend in the tunnel circumferential direction, and is disposed on the steel reinforcing rib 11 that is disposed adjacent to the joint plate 9 with a space therebetween and in parallel with the joint plate 9 and fixed to the main girder 2. It is fixed by welding or bolts.
In the case where the filling concrete 5 is filled and the surface of the reinforcing member 17 is a rough surface having irregularities and is intended to adhere to the filling concrete 5, the reinforcing member 17 is fixed to the filling concrete. Thus, it is not necessary to fix to the steel reinforcing rib 11 (the same applies to the following embodiments).
The reinforcing member 17 is appropriately provided with a through hole for inserting an anchor leg portion for the joint 20 for connecting segments adjacent in the tunnel axis direction as appropriate.

In the second embodiment shown in FIGS. 4 and 5, when the reinforcing member 17 is projected in addition to the groove-like portion 15 when the cross section of the main beam 2 is projected onto the joint plate 9 in the circumferential direction of the tunnel, the groove The opening side of the shaped part 15 is closed, and a substantially closed annular part 16 (see FIG. 5a) is formed.
And when the reinforcing member 17 and the main girder 2 made of a substantially rectangular steel plate in the tunnel circumferential direction are projected on the joint plate 9 side in the tunnel circumferential direction, the reinforcing member 17 and the main girder 2 are almost closed. A rectangular annular closed annular portion 16 is formed to increase the bending rigidity of the joint plate 9 in the closed annular portion 16. The center of gravity of the connecting portion 4 such as the joint members 12 and 13 or the center axis of the bolt hole 10 is positioned in the closed annular portion 16 on the joint plate 9 side in the tunnel circumferential direction.
The bending rigidity of the joint plate 9 in the closed annular portion 16 is higher in the tunnel radial direction and the tunnel axis direction than in the segment 1 of the first embodiment. Accordingly, since the joint members 12 and 13 are fixed to the joint plate 9 having a further increased bending rigidity in the closed annular portion 16, the joint members 12 and 13 are directly connected to the main beam 2 from the joint plate 9 or the reinforcing member 17 and the reinforcing member. The tensile force in the tunnel circumferential direction can be efficiently transmitted to the main beam 2 indirectly through the rib 11.
In particular, since it is the flange 8 of the main girder 2 that bears the tensile force in the tunnel circumferential direction, it is transmitted to the flange 8 of the main girder 2 via the joint plate 9 or the like.

The main girder 2 and the reinforcing member 17 enhance the bending rigidity of the joint plate 9 in the vicinity where the joints such as the joint members 12 and 13 are provided. In the second embodiment, the joint plate 9 and the reinforcing rib 11 are connected to each other by the reinforcing member 17 made of a substantially rectangular steel plate, so that the joint plate 9 is joined to the joint plate 9 via joint portions such as the joint members 12 and 13. When tensile force in the tunnel circumferential direction is applied, when the joint member 9 is subjected to bending deformation in the tunnel axis direction, the reinforcing member 17 and the reinforcing rib 11 are jointly provided, and the filled concrete 5 is present. The three members of the reinforcing member 17 and the reinforcing rib 11 accompanied by adhesion to the filling concrete 5 are jointly resisted.
In addition, in the case of the reinforcing member 17 made of a steel plate or the like, an opening is appropriately formed, or a plurality of openings are formed as described below, and the concrete between the main beam 2 and the reinforcing member 17 is formed. You may make it improve a filling property.
The reinforcing member 17 may be a striped steel plate having unevenness on one side or a steel plate having unevenness on both sides to enhance adhesion to concrete.
The reinforcing member 17 may have a configuration in which a plurality of steel plates extending in the circumferential direction of the tunnel, such as two or three, are arranged in parallel at intervals in the tunnel radial direction.
The length of the reinforcing member 17 in the circumferential direction of the tunnel may be the length from the joint plate 9 to the reinforcing rib 11 when the reinforcing member 17 is fixed to the reinforcing rib 11, and is fixed to the main girder 2. In this case, the length may be shorter than that in the above case. For example, the distance may be about ½ of the length from the joint plate 9 to the reinforcing rib 11 and away from the reinforcing rib 11.

6 and 7 show a segment of a composite structure for tunnel lining according to a third embodiment of the present invention. In this 3rd Embodiment, the reinforcement member 17 is the form comprised by the rod-shaped member 19 which consists of a several reinforcing bar or a steel bar, and the other structure is the same as that of the case of the said 2nd Embodiment.
Each bar-shaped member 19 is arranged in the same plane in the tunnel radial direction, and each bar-shaped member 19 is arranged in parallel to the main beam 2 so as to contact a straight line connecting the front ends of the flanges 8. The base end side is fixed to the joint plate 9, and the distal end portion of each rod-shaped member 19 is fixed to the reinforcing rib 11. In this embodiment, the rod-like member 19 installed in the same plane in the tunnel radial direction is configured to exert the same action as that of the reinforcing member 17 made of one steel plate. When viewed from the tunnel axis direction, a plurality of rod-like members 19 are arranged at substantially equal intervals between the tip portions in the state of being close to the tip portions of the flanges 8 in the tunnel radial direction.
And when the reinforcing member 17 consisting of a plurality of rod-shaped members 19 and the main girder 2 are projected on the joint plate 9 side in the tunnel circumferential direction, the reinforcing member 17 consisting of the plurality of rod-shaped members 19 and the main girder 2 A substantially closed rectangular annular closed annular portion 16 is formed to increase the bending rigidity of the joint plate 9 in the closed annular portion 16. The center of gravity of the connecting portion 4 such as the joint members 12 and 13 or the center axis of the bolt hole 10 is positioned in the closed annular portion 16 on the joint plate 9 side in the tunnel circumferential direction.
In the form in which the filling concrete 5 is provided as the above-described modified form, the rod-shaped member 19 is prevented from coming off by attaching it to the filling concrete 5 without fixing the tip portion of the stick-shaped member 19 to the reinforcing rib 11. The plate 9 may be reinforced to increase bending deformation resistance.
Further, in the case of adhering to the filling concrete 5, if it is necessary to make the length longer than the length of the reinforcing rib 11 by design, a through hole is provided in the reinforcing rib 11 to lengthen the reinforcing member 17. It may be.

8 and 9 show a segment 1 of a composite structure for tunnel lining according to a fourth embodiment of the present invention.
In this form, it is a form which shows that the reinforcing member 17 which consists of a reinforced steel plate may be fixed only to the main girder 2, or may be fixed to the main girder 2 and the steel reinforcing rib 11.
As shown in FIG. 9 (b), a reinforcing member 17 made of a substantially rectangular or fan-shaped steel plate 21 over the flange 8 in the main girder 2 is disposed at the tip of the flange 8 and fixed by fillet welding. Has been. Further, as shown in FIG. 9C, the reinforcing rib 11 may be fixed by welding or the like. When the reinforcing member 17 is not fixed to the reinforcing rib 11, in order to improve the filling property of the concrete between the main beam 2 and the reinforcing member 17, the reinforcing member 17 is slightly separated from the reinforcing rib 11 in the circumferential direction of the tunnel. A reinforcing member 17 having a short size is installed.
Since the other configuration is the same as that of the second embodiment, like parts are denoted by like reference numerals.

(Fifth embodiment)
10 to 12 show a segment 1 of a composite structure for tunnel lining according to a fifth embodiment of the present invention. This form is a representative form showing that the joint plate 9 may be a joint part formed by the bolt hole 10 instead of the joint part formed by the joint members 12 and 13.
In order to connect the joint plates 9 of the segments adjacent to each other in the tunnel circumferential direction by providing the joint plate 9 with a joint portion including the bolt holes 10, a notch for bolt connection is provided in the inner flange side of the main girder 2. A portion 22 is provided, and has a hollow bolt box 23 that is formed of a recess that opens to the inner side of the tunnel and is connected to the bolt hole 10. As a bolt box, it is good also as a hollow part made by box removal, and the form which installs the hollow box made from a thin steel plate in the joint board 9 may be sufficient.
In each of the embodiments described above and below, such a bolt hole 10 may be provided as a segment, and the segments adjacent to each other in the tunnel circumferential direction may be joined together by bolts and nuts.

(Sixth embodiment)
FIG. 13 shows a part of a segment according to the sixth embodiment of the present invention.
In the sixth embodiment, as shown in FIG. 13, the flange 8 is arranged at a position about the plate thickness of the skin plate 3 away from the upper and lower ends of the web 7 in the tunnel radial direction, and is continuous in the tunnel circumferential direction. A representative form indicating that the assembly type main girder 2 is fixed by welding, and a reinforcing member 17 made of a rectangular steel plate is disposed and fixed by welding over the front end of each flange 8 of the main girder 2. It is. In such a configuration, the size of the closed annular portion 16 is reduced by the size of the closed annular portion 16 projected to the joint plate 9 in the circumferential direction of the tunnel by the size of the flange 8 in the tunnel radial direction. The bending rigidity of the joint plate 9 is increased, and the dimension of the reinforcing member 17 in the tunnel radial direction can be reduced.
As a modified form of the sixth embodiment, a steel segment or a synthetic segment may be used in which the reinforcing member 17 is not provided. The main girder 2 may be replaced with the main girder 2 in each of the above embodiments and the following embodiments.

(Seventh embodiment)
14 and 15 show a segment of a composite structure for tunnel lining according to a seventh embodiment of the present invention.
In the seventh embodiment, when the filling concrete 5 is provided, in order to ensure the integration of the steel shell 6 and the filling concrete 5 in the segment 1, the tunnel circumference between the steel shell 6 and the filling concrete 5 is ensured. In order to prevent the displacement of the direction, the peeling of the filling concrete 5 or the protruding into the inner radial side of the tunnel radial direction, the displacement preventing member such as a deformed reinforcing bar or a deformed steel bar across the flange 8 in the main girder 2 This is a representative form for showing that a rod-shaped member 25 in the tunnel axis direction that also serves as a member may be provided.
By installing the steel rod-like member 25 between the main girders 2 as described above, it is possible to obtain the segment 1 in which the integration of the steel shell 6 and the filling concrete 5 is enhanced, and the width in the tunnel axial direction. This is advantageous when a wide segment having a large size is used.
The portion of the rod-like member 25 fixed to the main girder 2 prevents the main girder 2 and the filling concrete 5 from being displaced in the circumferential direction of the tunnel.

(Eighth embodiment)
FIG. 16 shows a segment 1 according to the eighth embodiment of the present invention.
In this configuration, in order to prevent the inner side of the segment in the circumferential direction of the tunnel and the filling concrete 5 from slipping and to enhance the integration of the steel shell 6 and the filling concrete 5, the main girder 2 and the skin plate in the circumferential direction of the tunnel. This is a representative form to show that a number of steel stoppers 14 may be fixed by welding at intervals.
In the form shown in the figure, a number of anti-slip members 14 are spaced from each other so as to form a line in the circumferential direction of the tunnel between the web 7 of the main beam 2 of the segment 1 and the inner surface of the flange 8 and the inner surface of the skin plate 3. Provided.
Since the tip portion of each detent member 14 is provided with a head that swells inside the segment, it is surely integrated with the filling concrete 5, and the skin plate 3 and the filling concrete 5 Can be prevented from sticking together or protruding into the inner radial side of the tunnel radial direction.

(Ninth embodiment)
FIG. 17 is a representative form for showing that the cross-sectional form of the main girder 2 including the web 7 and the flange 8 may be a cross-sectional I shape or a H-shaped cross section when the present invention is implemented.
In the form in which the ground 8 side flange 8 and the tunnel inner space side flange 8 are provided on the upper and lower portions of the web 7 so as to protrude on both sides of the web 7 in the tunnel axial direction, the flange is located inside the tunnel axial direction. 8 and the web 7 can form the groove-like portion 15 when they are projected on the tunnel circumferential joint plate side, or can form the closed annular portion 16 in cooperation with the reinforcing member 17, The main girder 2 may be used, and the reinforcing member 17 is disposed over the vicinity of the distal end portion of each flange 8, and one end side (base end side) of the reinforcing member 17 is fixed to the joint plate 9. The other end side of the reinforcing member 17 may be fixed to the reinforcing rib 11 or the main girder 2 by welding, or may be fixed to the filling concrete 5 by adhesion.

(10th Embodiment)
18 and 19 show a segment of a composite structure for tunnel lining according to a tenth embodiment of the present invention.
In the tenth embodiment, a main girder 2 in which a flange 8 on the inner side of the tunnel is integrally provided at one end side in the tunnel radial direction of the web 7 is used, and the main girder 2 has an L-shaped cross section. By providing the reinforcing member 17 in parallel, when the main girder 2 and the reinforcing member 17 are projected on the joint plate side in the tunnel circumferential direction, a rectangular or trapezoidal groove-like portion 15 is formed on the joint plate side. It is.
The peripheral edge of the skin plate 3 is fixed to the web 7 and the joint plate 9 by welding.
As in the tenth embodiment, even if the cross-sectional shape of the main beam 2 is L-shaped, the reinforcing member 17 is provided in parallel to the main beam 2 and one end side (base end side) of the reinforcing member 17 is connected to the joint plate 9. Also, the tip of the reinforcing member 17 is adhered and fixed to the reinforcing rib 11 or the flange 8 of the main girder or the filling concrete 5 to form a sure groove-like portion. The bending rigidity of the joint plate 9 in the groove-like portion 15 can be remarkably increased.
However, even when the reinforcing member 17 is not provided, the groove 7 is formed when the web 7 and the flange 8 of the main girder 2 are projected on the tunnel circumferential joint plate 9 side. In order to increase the bending rigidity of the portion, it is advantageous that the groove is formed by two upper and lower flanges of the web 7. Although not shown, the reinforcing member 17 has an L-shaped cross section and is arranged in parallel with the main girder 2 so that the base end side is fixed to the joint plate 9 and the main girder 2 or the reinforcing rib 11 is further filled. By fixing the tip side or the like to at least one of the concretes 5, a closed annular portion can be formed when the main girder 2 and the reinforcing member 17 are projected onto the joint plate 9 side.

(Eleventh embodiment)
23 and 24 show a segment 1 of a composite structure for tunnel lining according to an eleventh embodiment of the present invention.
This eleventh embodiment is a representative form for indicating that the reinforcing members 17 arranged in parallel to the main beam 2 may be arranged in an inclined manner.

In the eleventh embodiment, the main girder 2 is a main girder 2 in a form in which a web 8 extending in the circumferential direction of the tunnel is provided with a flange 8 on the inner side in the tunnel radial direction. In addition, the reinforcing member 17 made of a rectangular or fan-shaped steel plate is in contact with the distal end portion of the flange 8 at the proximal end portion on the inner air side in the tunnel radial direction, and approaches the web 7 at the distal end portion on the natural mountain side. Inclined and arranged, the proximal end side of the inner side is fixed to the main girder 2 by welding in the tunnel circumferential direction to the distal end of the flange 8, and is fixed to the skin plate 3 in the tunnel circumferential direction as necessary on the natural ground side Fixed by welding or the like.
Further, the proximal end side of the reinforcing member 17 in the circumferential direction of the tunnel is fixed to the joint plate 9 by welding or the like as in the above embodiment.
Further, as a modification of the above, when the reinforcing member 17 is not fixed to the main girder 2, it is fixed to the reinforcing rib 11 by welding or the like. Further, when the filling concrete 5 is provided, the reinforcing member 17 may be fixed to the filling concrete 5 so as not to be fixed to the main beam 2 or the reinforcing rib 11.

  As in the eleventh embodiment, when the one end side of the reinforcing member 17 is inclined so as to approach the main girder 2 in the tunnel radial direction, the main body 2 is inclined to the tunnel circumferential joint plate 9 side. The groove 15 formed when the beam 2 and the reinforcing member 17 are projected has a small area, and the bending rigidity of the joint plate 9 is increased. The joint members 12 and 13 are positioned so that the center of gravity of the joint members 12 and 13 projected on the joint plate 9 side in the circumferential direction of the tunnel or the central axis of the bolt hole 10 is positioned at the portion of the joint plate 9 whose bending rigidity is increased. Or the bolt hole 10 is provided. Therefore, the tensile stress is transmitted to the main girder 2 (particularly the flange 8) through the portion (groove portion) of the joint plate 9 in which the bending rigidity is increased without increasing the thickness of the joint plate 9.

(Twelfth embodiment)
25 and 26 show a tunnel lining segment 1 according to a twelfth embodiment of the present invention.
This form is a representative form for showing that it is not necessary to provide the filling concrete 5 in the present invention. In the second embodiment shown in FIGS. 4 and 5, the filling concrete 5 is removed. In addition, since the portions other than the filling concrete 5 are the same as those in the second embodiment, the same reference numerals are given to the same portions.
Even in such a configuration, when the web 7 of the main girder 2, the natural mountain side flange 8, and the inner space side flange 8 are projected on the joint plate 9 side in the tunnel circumferential direction, the groove-like portion 15 is formed, and the groove The bending rigidity of the joint plate 9 in the portion 15 is significantly increased. Then, the center of gravity of the joint members 12 and 13 or the center axis of the bolt hole 10 when projected on the joint plate 9 side in the tunnel circumferential direction is positioned in such a portion where the bending rigidity is enhanced. Therefore, the economical segment 1 using the inexpensive joint plate 9 can be obtained without increasing the thickness of the joint plate 9.

27 and 28 show a case where a segment ring is constructed using the segment 1 of the first embodiment as a representative form of each of the embodiments. A joint that connects the segments in the tunnel axis direction is omitted.
FIG. 27 shows a state immediately before the segments 1 adjacent to each other in the tunnel circumferential direction are connected when the segment ring is constructed, and FIG. 28 shows a state in which the segments 1 adjacent to each other in the tunnel circumferential direction are connected to each other. It is shown.

  In a state where the joint members 12 and 13 of the segments 1 adjacent to each other in the tunnel circumferential direction are connected, the center of gravity of each joint member 12 and 13 is positioned on the central axis of the connected joint members 12 and 13 in plan view. This is more preferable because an eccentric moment does not act on the joint members 12 and 13 when a tensile force or a compressive force in the tunnel circumferential direction acts on the joint members 12 and 13. In the joint member 13 having a recess for accommodating the engaging portion of the joint member 12, the center axis before connection and the center axis when connected to the joint member 12 are slightly different from each other. In this case, the center of gravity of the joint members 12 and 13 is located in the groove-like portion 15 (or the closed annular portion 16) when the main girder 2 is projected onto the joint plate 9 side when viewed from the circumferential direction of the tunnel. Thus, the center axis before connection of the joint members 12 and 13 and the center axis when the joint members 12 and 13 are connected to each other are both groove-like portions 15 (or closed annular portions) projected onto the joint plate 9. 16) Since the joint plate 9 is located in the main girder 2 or a portion reinforced by the main girder 2 and the reinforcing member 17, it is not necessary to increase the thickness of the joint plate 9.

  In the present invention, although not shown in the drawings, in addition to the main girder 2 positioned at both ends in the tunnel axis direction, a mode in which a middle main girder is provided with a space between the main girder 2 may be used. What is necessary is just to make it the structure similar to the said embodiment in the part of a girder.

  In the illustrated embodiment, the male joint member 12 (4) or the female joint member 13 (4) is configured to embed the anchor portion with the filling concrete 5, but adheres to the filling concrete 5. The transmission of the pulling force to the main girder 2 is not expected.

  When the present invention is carried out, although not shown in the drawings, the reinforcing member 17 installed over the front end portion of the ground pile side flange 8 and the inner space side flange 8 in the main girder 2 or the vicinity thereof is a steel plate. Alternatively, a rod-shaped member such as a steel rod may be fixed by welding.

  In the case of the illustrated embodiment, the segment of the composite structure in which the steel 5 is appropriately arranged and filled with the concrete 5 is mainly shown. However, when the present invention is implemented, It may be applied to a steel segment not filled with concrete 5, and in that case, reinforcing ribs 11 may be added as appropriate.

  When carrying out the present invention, although not shown in the drawings, it may be a six-sided steel shell segment or a concrete filling segment in which a skin plate is provided on the inner side of the tunnel.

  When implementing this invention, although illustration is abbreviate | omitted, as the main beam 2, it is good also as a main beam of the assembly form which joins a flange member and a web member by welding continuous in the member longitudinal direction.

  In the illustrated embodiment, a five-sided steel shell is used. However, when the present invention is implemented, a six-sided steel shell provided with a skin plate on the inner side of the tunnel may be used.

DESCRIPTION OF SYMBOLS 1 Segment 2 Main girder 3 Skin plate 4 Connection part 5 Filled concrete 6 Steel shell 7 Web 8 Flange 9 Joint board 10 Bolt hole 11 Steel reinforcement rib 12 Joint member (male type)
13 Joint member (female)
14 Detachment member 15 Groove-shaped portion 16 Closed annular portion 17 Reinforcement member 18 Anchor leg portion 19 Bar-shaped member 20 Joint 21 Reinforced steel plate 22 Notch portion 23 Bolt 24 Bolt box 25 Rod-shaped member (in tunnel axis direction)

Claims (9)

A joint plate is arranged over the circumferential end of at least two main girders and is fixed to the main girder, and a joint portion of either a joint member fixed to the joint plate or a provided bolt hole is provided. In the segment
Each main girder comprises a web and at least two flanges connected to the web;
In the segment, the reinforcing member whose one end is fixed to the joint plate, are arranged parallel to the main beam is fixed directly or indirectly to the main girder,
A groove-like portion formed by the web and flange in the main beam obtained by projecting the main beam to the joint plate side, closed loop portion is formed by a portion due to the reinforcing member which is projected on the joint plate side, the the connection portion is the joint plate width direction position provided for the joint plates are provided a central axis of the center of gravity or the bolt hole of the joint member so as to be positioned within the closed loop portion, the other end of the reinforcing member Is embedded and fixed in concrete filled inside the steel shell in the segment,
The flange in the main girder is a natural ground side flange or an inner space side flange, and a line connecting the tip of the ground surface side flange in the tunnel axis direction and the inner space side flange in the tunnel axis direction is projected to the joint plate side. In this case, the segment is characterized in that the reinforcing member is connected to the projected line on the joint plate side or the portion of the joint plate in the vicinity of the line . The segment according to claim 1 , wherein the reinforcing member is connected to a distal end of the natural mountain side flange and a distal end of the inner space side flange. The segment according to claim 1 or 2 , wherein the reinforcing member is either a plate-like member or a rod-like member. The segment according to any one of claims 1 to 3 , wherein the reinforcing member is connected to a reinforcing rib adjacent to the joint plate. The segment according to any one of claims 1 to 4 , wherein the inner-spaced flange has a notch for bolt connection. The segment according to any one of claims 1 to 5 , wherein the main girder cross section is either I-shaped or C-shaped. The segment according to any one of claims 1 to 5 , wherein the main girder cross section is L-shaped. The segment according to any one of claims 1 to 7 , wherein a slip-preventing member is installed inside the steel shell in the segment. The segment according to claim 8 , wherein the displacement preventing member provided on the flange is a rod-shaped member installed across the main girders.

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