JP4589644B2 - Seismic joint structure of segment - Google Patents

Description

  The present invention relates to a joint structure of a shield tunnel lining segment, and mainly improves the joint portion between the segment rings, particularly the earthquake resistance in the tunnel axial direction, and reduces the tensile force acting between the segment rings during an earthquake. This is related to the seismic joint structure of the segment.

  Conventionally, in a shield tunnel, a new segment ring is constructed by connecting a new segment to an existing segment or a segment ring in the tunnel axis direction, and a tunnel is constructed. In this case, (1) Since the ring cannot be strengthened by a single segment ring, the segments in the adjacent segment rings are arranged in a staggered manner, such segment rings are connected, and at least two segment rings are connected together to be rigid. The segment ring structure with improved As a joint structure used for such a segment ring structure, a ring-to-ring joint structure (hereinafter, also referred to as a rigid joint structure) described in JP-A-11-101093 (Patent Document 1) having high tensile rigidity in the tunnel axis direction. ) Is known.

  Since the segment rings in the segment ring structure composed of at least two rings as described above have an inter-ring joint structure (rigid joint structure) in which the tensile rigidity in the tunnel axis direction is increased without interposing an elastic body ( 2) Tensile rigidity in the tunnel axis direction as shown in Japanese Patent Laid-Open No. 2003-82992 (Patent Document 2) between the segment ring structures adjacent in the tunnel axis direction. It has been considered to improve the earthquake resistance of the tunnel by interposing a ring-to-ring joint structure (hereinafter also referred to as an earthquake-resistant joint structure) with a reduced height.

  (3) As shown in FIG. 14, it is also known that the above-described rigidly coupled joint structure A and earthquake-resistant joint structure B are alternately arranged in the tunnel axis direction. (For example, see Patent Document 3)

  The joint structure having high tensile rigidity (1) is, for example, a rigid joint structure as shown in FIG. 12, and the earthquake resistant joint structure (2) is, for example, an earthquake-resistant joint structure as shown in FIG. is there.

  Here, the specific structure of the rigid joint structure will be briefly described with reference to FIG. 12. In the male engagement member 6 provided on one side surface 11 of the segments 1 and 2 facing in the tunnel axis direction. The locking member 3 pushes and opens the spring-biased pair of slide stoppers 12 in the female engagement member 5 provided on the other side surface 10. The slide stopper 12 is movably held in the tunnel radial direction within the guide hole 18 of the slide stopper holding frame 20 in the female engagement member 5.

  This prior invention solves the problem of incompatibility in the case of a misalignment in the tunnel radial direction between rings at the time of construction in a boltless fitting joint portion of a segment. That is, according to this prior invention, a fitting joint having high tensile rigidity capable of easily positioning and connecting the segments in the tunnel radial direction and ensuring continuity of the segment ring against a large tensile force in the tunnel axial direction. It is a structure.

The specific structure of the earthquake-resistant joint structure B will be briefly described with reference to FIG. 13. This structure is a structure in which an elastic body is further incorporated in the female engagement member 5 in the structure shown in FIG. Thus, the elastic body 40 is installed between the slide stopper holding frame 20 and the slide stopper 12, and the female side engaging member 5 and the male side engaging member 6 are both tunneled by the amount of the elastic body 40 installed. The axial dimension is longer. In FIG. 13, reference numeral 22 is a thin steel plate, 23 is a guide material that also serves to prevent rotation of the slide stopper, and 24 is a presser pin.
JP 11-101093 A Japanese Patent Laid-Open No. 2003-82992 Japanese Patent Laid-Open No. 2003-184490

  The rigid joint structure A and the earthquake-resistant joint structure B are arranged between the web surfaces facing each other of the segment rings adjacent to each other in the tunnel axial direction. In the state in which the joints are fitted to each other because the elastic body 40 is interposed on the female joint side, the joint outer dimension L in the tunnel axial direction of the earthquake-resistant joint structure shown in FIG. 12 is longer than the rigid joint structure A having a joint outer dimension L1 in the tunnel axial direction shown in FIG. 12, that is, in the rigid joint structure A and the earthquake-resistant joint structure B, the tunnel axial direction The joint external dimensions are different.

  The rigid joint structure A and the earthquake-resistant joint structure B have different joint outer dimensions in the tunnel axial direction, and therefore it is necessary to widen the distance between the webs in the segments between the segment rings.

  For this reason, when it is going to mix the earthquake-resistant joint structure B and the rigid joint structure A, another response | compatibility will be needed. For example, the segment of the rigid joint structure A and the seismic joint structure B is not a segment having a special dimension in which the flange projecting length in the tunnel axis direction constituting the steel shell body is different. Therefore, if it is assumed that the projecting dimension of the steel shell flange projecting from the segment web is constant, the shape of the male side engaging member (male pin) used in the seismic joint structure B and the rigid joint structure A may be changed. Although measures such as changing the shape of the frame metal used for the female side engaging member (female metal fitting) are conceivable, this increases the number of parts constituting these and becomes complicated.

  Therefore, it is desirable that male and female hardware used for the earthquake-resistant joint structure B and the rigid joint structure A be made as common as possible, and that the joint dimensions in the tunnel axial direction be the same for both the rigid joint structure A and the earthquake-resistant joint structure B. It is.

As a result of various studies on the above points, the present inventor made the female engagement member used for the earthquake-resistant joint structure B and the rigid joint structure A a common hardware, and changed the length of the male engagement member in the tunnel axis direction. The present invention has been completed by finding that it can be advantageously solved by imparting earthquake resistance.
An object of the present invention is to provide a seismic joint structure for a segment that solves the above-mentioned problems based on this finding.

In the seismic joint structure of the segment of the first invention, the segments (1, 2) facing in the tunnel axial direction are connected in the tunnel axial direction, so that the male side is connected to the side surface (11) in the tunnel axial direction of one segment (2). In the joint structure of the segment in which the engaging member (6) is provided with the female engaging member (5) on the tunnel axial direction side surface (10) of the other segment (1), the male engaging member (6) is A locking member (3) having a locking projection (4) at the tip, and the locking member (3) is spring-biased in the tunnel axial direction and supported so as to move forward and the one segment (2) The case is provided with a case member (36) with a guide portion that is fixed to the side surface of the guide member and guides the locking member (3) in the tunnel axial direction, and the female engagement member (5) is connected to the other segment (1). ) Slide strike fixed to the side The par holding frame (20) and the holding frame (20) are movably supported in the tunnel radial direction and are spring-biased in the direction of closing the entry portion of the locking member (3). It comprises a slide stopper (12) capable of locking the protrusion (4), and the non-circular intermediate shaft portion (42) of the locking member (3) is the tip plate (38) of the case member with guide portion (36). ) Is movably fitted in the non-circular opening (39) to prevent the locking protrusion (4) at the tip of the locking member (3) from rotating .
According to a second aspect of the present invention, in the seismic joint structure for a segment according to the first aspect, the rigid coupling joint portion and the seismic joint structure for the segment are disposed between the web sides facing each other of the segment rings adjacent in the tunnel axial direction. In the rigid joint structure including the joint portion, the second locking member having the second locking protrusion at the tip of the male side engaging member provided on one side surface of the segment facing the tunnel axial direction is provided on the other side. In the female side engaging member provided on the side surface, the second slide stopper that makes a spring-biased pair is pushed open to enter, and the second locking member is welded to the axial side surface of the segment. The second slide stopper is fixedly movable in the tunnel radial direction in the guide hole of the second slide stopper holding frame in the female engagement member. Consists of Rukoto, welding tunnel axial length dimension from the web side of the segment of the locking member (3) having a locking projection (4) at the tip, the segment of the tunnel axis direction side (11) you characterized in that the same dimensions as the tunnel axial length dimension of the second locking member having said second locking projections in the rigid coupling joint for fixing (4).
In the third invention, in the seismic joint structure of the segment of the first invention or the second invention , the locking member (3) is spring-biased in the backward movement direction so that its base end abuts the side surface of one segment. It is characterized by being.
According to a fourth invention, in the seismic joint structure of any one of the first to third inventions, a coil spring, a fiber reinforcement is used as an elastic body for spring-biasing the locking member (3) in the backward movement direction in the tunnel axis direction. Any one of cylindrical elastic bodies such as rubber or epoxy resin is used.

(1) According to the first invention, the locking member having a locking projection at the tip, and the locking member is spring-biased in the tunnel axis direction and supported so as to be movable forward and fixed to the side surface of the one segment. By providing the case-attached case member, it is possible to provide a male-side engagement member that imparts earthquake resistance to the male-side engagement member. Therefore, the structure of the female-side engagement member can be simplified. In addition, it is possible to share the female side engaging member in the joint structure that connects the segment rings in the tunnel axis direction.
According to the second invention , since the male engagement members in all joint structures connecting the segment rings in the tunnel axis direction have the same length in the tunnel axis direction, all the segment rings in the tunnel axis direction are connected to each other. When combined with the common female side engaging member in the joint structure, the outer dimensions in the tunnel axis direction can be made constant when the male side engaging member and the female side engaging member are connected. Since the main girder spacing between the segments of the adjacent segment rings in the direction (that is, the web spacing with the main girder as the web) is constant and the web position of the segments is the same, the manufacture of the steel shell that constitutes the segment body Becomes easier. In other words, (1) even if it is a seismic joint, the web position of the main girder to be attached can be made the same as in the case of a rigid joint, so that the production of the segment steel shell becomes easy.
The second invention has the following effects.
(2) For the work of attaching the female engagement member (female hardware) to the web of the main girder, there is no distinction between a joint imparted with earthquake resistance and a rigid joint, and the work and inspection are facilitated.
(3) The shape of the female-side engagement member (female hardware) of the joint and the rigid joint provided with earthquake resistance is the same, the types of joint parts can be reduced, and the procurement of the parts becomes easy.
(4) Therefore, the economic efficiency of the segment is improved.
According to the first invention, the non-circular opening (39) is simply provided in the tip plate (38) of the case member with guide portion (36), and the non-circular intermediate shaft portion 42 of the locking member is moved to the opening. It is possible to prevent the locking projections from rotating together with the locking member only by fitting them.
According to the third invention, since the base end portion of the locking member having the locking protrusion is spring-biased in the backward movement direction so as to contact the side surface of the one segment, Since the position can be maintained in a stable posture, the male engagement member can be fitted into the female engagement member in a stable state.
According to the fourth aspect of the present invention, any one of a cylindrical elastic body such as a coil spring, fiber reinforced rubber, or epoxy resin is used as an elastic body that biases the locking member (3) in the tunnel axial direction. The locking member can be urged in the backward movement direction.

  Hereinafter, embodiments of the earthquake-resistant joint structure of the present invention will be described with reference to the drawings.

  1 and 2 show main elements of a seismic joint structure for a segment according to the present invention. In FIGS. 1A and 1B, the arrow D is the tunnel axial direction, the arrow E is the tunnel radial direction, and the arrow F is the tunnel circumferential direction. In each figure, a locking member 3 having a locking protrusion 4 protruding in the radial direction of the tunnel and extending in the circumferential direction of the tunnel as a male side engaging member 6 is formed on one side surface 11 in the tunnel axial direction of one segment 2. It is indirectly provided in a non-fixed state.

  The configuration of the male engagement member 6 will be further described. The male engagement member 6 is a steel cylindrical case 34 whose base end is fixed to one side surface 11 of the segment 2 in the tunnel axial direction by welding. A guide member with a guide part 35 having a guide part 35 that also serves to prevent rotation of the locking member 3 with a spring at the tip part, and a base end side is disposed in the case member with guide part 36 and the guide The spring-supported locking member 3 guided by the portion 35 and disposed so as to be able to advance in the tunnel axis direction indicated by the arrow G, and the elastic body 37 that urges the spring-supported locking member 3 to retreat. And.

  In the illustrated embodiment, the case member with guide part 36 is provided with a non-circular opening 39 penetrating in the tunnel axis direction on a cylindrical end plate 38. In the case where the non-circular opening 39 is also used as an anti-rotation opening, for example, as shown in the figure, it may be a substantially rectangular opening 39 or a triangular or more polygonal opening. However, if it is a non-circular opening, the intermediate shaft portion of the spring-supporting locking member 3 that is relatively movably fitted in the opening 39 and moves forward is slightly reduced in a similar shape or the like. By doing so, the locking projection 4 is prevented from rotating by preventing the locking member 3 with a spring receiving from rotating, and can be reliably joined.

  When a cement-type room temperature curable filler is provided between the side faces of the main beam between the segment rings (between the side faces of the web), if the gap between the opening 39 and the intermediate shaft portion of the engaging member 3 is large, the space between The cement-type room temperature curable filler flows into the case member 36 with the guide portion, and the shortening deformation of the elastic body 37 is hindered, and the engaging member 3 cannot move forward together with the other segment 1 during an earthquake or the like. In order to eliminate the possibility of losing the function of the earthquake-resistant joint, the gap is reduced, or a sealing material is appropriately provided in the opening 39, and the room temperature curable filler flows into the case member with guide part 36. It is better to prevent this.

  The above-described spring-carrying locking member 3 and locking projection 4 are prevented from rotating, and the non-circular intermediate shaft portion 42 of the spring-carrying locking member 3 is supported and guided, and the joint fittings of the segments between the segment rings are supported. As a means for ensuring the fitting and joining, although not shown in the drawings, a groove portion extending in the axial direction is formed in the shaft portion of the locking member 3 with a spring receiver, and the groove portion is slidably fitted into this groove. Protrusions can be provided on the guide member case 36 side, or conversely, protrusions extending in the axial direction can be formed on the shaft portion side, and grooves can be provided on the guide member case 36 side. In addition, when forming a groove part in the axial part of the latching member 3 with a spring support, it is necessary to seal so that the groove | channel may not be filled up suitably.

  The spring-supporting locking member 3 has a structure in which a locking projection 4 is provided at the tip, and a spring receiving portion 40 formed of an annular flange is integrally formed on the intermediate shaft portion, as shown in FIG. As described above, in a state in which the spring-supporting locking member 3 is retracted, the female-side slide is provided between the rear surface 4a of the locking projection 4 in the tunnel axis direction and the front end surface of the front end plate 38 of the case member 36 with guide portion. The interval is set to be slightly larger than the width dimension of the female slide stopper 12 in the tunnel axis direction so that the stopper 12 can be disposed.

  Further, a spring receiving portion 40 made of a flange projecting in a direction perpendicular to the axis is provided at an intermediate portion of the shaft portion of the locking member 3 with spring receiving. As a method of providing the locking projection 4 on the shaft portion of the locking member 3 with spring support, when the shaft portion and the locking projection 4 are joined, a screw type joint in which a male screw shaft portion is provided on one side and a female screw hole is provided on the other side. Alternatively, a welding joining method, an adhesive joining method, or a joining means combining these may be used.

Further, the length L in the tunnel axis direction of the spring-carrying locking member 3 is the length dimension of the locking member 3a in the rigid coupling method in which the locking member 3a shown in FIG. L is set to the same dimension as L, and the distance between the segment ring webs in the tunnel coupling direction rigid joint (also called rigid joint structure) and seismic joint (hereinafter also called earthquake resistant joint structure) Are set to be the same. In the present invention, the rigid coupling joint structure part in the tunnel axial direction and the earthquake-resistant joint structure part share the same parts, and the spring-supported locking member 3 and the locking member 3a use the same parts. Therefore, the interval between webs between the segment rings (between adjacent segments in the tunnel axis direction) is the same between any segment rings.

  In the illustrated embodiment, the elastic body 37 that urges the locking member 3 with spring reception to retreat is formed between the top top plate 38 of the case and the spring receiving portion 40 of the locking member 3 with spring reception. A coil spring 41 is interposed in a compressed state to urge the locking member 3 with spring reception so that the locking member 3 with spring reception is always retracted. In the contact state, the web side surface 11 takes a reaction force when the spring-supported locking member 3 is fitted to the female engagement member of the other segment ring.

  The elastic body 37 may be a spring other than a coil spring, and although not shown, a hollow cylindrical elastic body such as a cylindrical fiber reinforced rubber or an epoxy resin may be used.

  The male side engaging member 6 is formed on the segment side surface 11 in a state in which the case member 36 with guide portion, the locking member 3 with spring support, and the elastic body 37 including the coil spring 41 are unitized. The base end portion of the case-provided case member 3 is fixed by welding.

  Next, the female side engaging member commonly used in the present invention in the seismic joint structure part and the rigid joint structure part uses a female side engaging member having the same structure as that of the conventional rigid joint structure. A part of the structure of the conventional female side engaging member is partially overlapped with the conventional female side engaging member, but will be described in detail with reference to FIG.

  A slide stopper holding frame 20 is fixed as a female-side engaging member 5 on one side surface 10 of the other segment 1 in the tunnel axis direction, and the pair of slide stoppers 12 are movable in the tunnel radial direction by the slide stopper holding frame 20. Is provided. The pair of slide stopper holding frames 20 that are substantially parallel with a distance in the circumferential direction of the tunnel is composed of a metal plate having a predetermined width, length, and thickness, and the plate is long in the tunnel radial direction. Two guide holes 18 are opened. One side surface of the slide stopper holding frame 20 is fixed to one side surface 10 of the other segment 1 in the tunnel axis direction by welding.

  The pair of slide stoppers 12 has a square shaft shape, and a tapered surface 12A is formed on the opposing surface of both stoppers 12 so that the entry side of the locking member 3 with spring support is expanded. Further, the slide stopper 12 is provided in the guide hole 18 so as to be movable in the tunnel radial direction without rattling. The pair of slide stoppers 12 is biased in a direction approaching between the connecting frame 28 and the slide stopper 12 which are installed on the upper and lower ends of the left and right slide stopper holding frames 20 and fixed by the fixing bolts 21. A spring 7 is provided.

  Due to such a structure, when the eccentricity in the tunnel radial direction between the segments 1 and 2 facing each other in the tunnel axis direction is 0, the locking member 3 is brought into the tapered surface 12a by bringing the segments 1 and 2 close to each other. As a guide, the gap between the pair of slide stoppers 12 is entered while being expanded, and the locking projection 4 engages with the slide stopper 12 and does not come out.

  On the other hand, in actual construction, the opposing segments 1 and 2 are often eccentric, and it is extremely difficult to correct the eccentricity to 0. In this case, a maximum of about 2 mm is allowed. In many cases, the ranges are connected while being eccentric. In this case, in the seismic connection structure of the present invention, as the segments 1 and 2 are eccentric, the locking member 3 enters a position shifted by 2 mm in the tunnel radial direction from the normal entry position with respect to the slide stopper 12, and slides. Locks with the stopper 12. In this case, the pair of slide stoppers 12 can easily follow the eccentricity of the locking member 3 by slightly changing the bias of the pair of springs 7 and are engaged at a position displaced in the tunnel radial direction by 2 mm within the guide hole 18. It mechanically engages with the locking projection 4 of the stop member 3. The engagement posture of both members (that is, the slide stopper 12 and the locking member 3 with the spring) at that time is exactly the same as the normal engagement posture when the eccentricity of the segments 1 and 2 is zero.

  Also, when a segment ring is constructed by connecting a plurality of segments in the circumferential direction between the opposing segments 1 and 2, they are often misaligned with the segments 1 and 2 of the adjacent segment ring. It is almost impossible to make this displacement zero. In this case, there are many cases in which the positional deviation in the tunnel circumferential direction of about 5 mm at maximum is allowed as a permissible range, and the connection is performed with the positional deviation in the tunnel circumferential direction as it is. In this case, in the earthquake-resistant joint structure of the present invention, by forming a predetermined gap 19 between both side surfaces of the spring-supporting locking member 3 and the pair of slide stopper holding frames 20, Corresponding to the displacement of the segments 1 and 2 in the circumferential direction of the tunnel, a pair of slides is provided at a position where the spring-supporting locking member 3 is offset to the left or right side from the intermediate position of the left and right slide stopper holding frames 20. It enters between the stoppers 12 and is mechanically locked to the slide stoppers 12. At this time, the engagement posture of both members (that is, the slide stopper 12 and the locking member 3 with the spring support) is completely different from the normal engagement posture when the displacement in the tunnel circumferential direction of the segments 1 and 2 is zero. The same.

  As described above, according to the seismic joint structure in the segments 1 and 2 of the present invention, when the segments 1 and 2 facing the tunnel axis direction are displaced in either the tunnel radial direction or the tunnel circumferential direction. However, the engagement posture between the spring-supporting locking member 3 and the slide stopper 12 maintains the same engagement state at the normal position with no displacement at any displaced position. it can. Therefore, the problem of poor engagement at the segment connecting portion due to segment misalignment does not occur, the allowable range of accuracy in the segment connecting portion structure is widened, and each portion can also be constituted by a linear member, which is easy to manufacture.

  A specific embodiment of the present invention will be described with reference to FIGS. In each figure, segments 1 and 2 to be connected are constituted by a steel shell 8 and concrete 9 filled therein, and on one side surface (web) 11 of the steel shell 8 of one segment 2 in the tunnel axis direction. The male side engaging member 6 is provided, and one side surface (web) 10 in the tunnel axial direction of the steel shell 8 of the other segment 1 is provided on one side surface of the slide stopper holding frame 20 in the female side engaging member 5. It is fixed by welding.

  The female-side engaging member 5 is assembled in a frame shape by arranging the connecting frames 28 at the upper and lower ends of the slide stopper holding frame 20, the fixing bolt 21 is inserted into the bolt insertion hole 29 of the connecting frame 28, and the holding frame 20 By screwing into the internal threads 31 formed on the upper and lower end surfaces, both the frames 20 and 28 can be firmly coupled. Further, the split pins 33 are inserted into the pin holes 32 at both ends of the slide stopper 12, and the slide stoppers 12 escape from the guide holes 18 by engaging the split pins 33 with the outer surface of the slide stopper holding frame 20. It is provided not to. The female engagement member 5 is configured as a single unit (unit) before being fixed to the one side surface 10 of the segment 1, and is welded to the one side surface 10 of the segment 1 in this single state.

  Further, in FIG. 3 and FIG. 4, one female engagement member 5 and one male engagement member 6 are provided at the center portion of the tunnel circumferential direction on one side surface of the segments 1 and 2, respectively. Instead, a plurality of female engagement members 5 and male engagement members 6 may be provided at predetermined intervals.

  When the segments 1 and 2 are connected, from the state shown in FIG. 7, one segment 1 or the other segment 2 moves toward the opposite segment in the tunnel axis direction. At this time, the locking member 3 with the spring enters between the pair of slide stoppers 12 while expanding the pair of slide stoppers 12 against the force of the spring 7, and the locking projection 3 with the spring engages with the slide stopper 12 as shown in FIG. At the same time, the fitting protrusions 16 provided on the upper and lower flanges 15 of one segment body are fitted into the fitting recesses 14 provided on the upper and lower flanges 13 of the other segment body.

  After connecting the segments 1 and 2 as described above, or after configuring the segment ring, as shown in FIG. 9, between the steel shells 8 of the segments 1 and 2, room temperature curing properties such as mortar Material 17 is filled.

Next, the operation of the earthquake-resistant joint structure of the present invention will be described.
The above-mentioned fitting method (that is, boltless) inter-ring joint structure employed in the present invention is also known, and in this joint structure, the joint between the rings is tensioned due to deformation in the tunnel axial direction that occurs during an earthquake. Force is generated.

  When such a large tensile force acts in the tunnel axial direction, one segment 2 (segment ring) and the other segment 1 (segment ring) are separated from each other in the rigid joint structure portion and the earthquake-resistant joint structure portion. However, in the earthquake-resistant joint structure portion, the tensile force acting in the tunnel axial direction corresponding to this is moved forward with the other segment 1 so that the coil spring 41 is shortened and moved together with the other segment 1. It can correspond to.

  Thus, when a large tensile force acts on the joint between rings, in the present invention, an earthquake resistant structure is achieved by preventing damage to the joint between rings due to this tensile force. When a tensile force is applied, an elastic body 37 is placed between the male engagement member 6 side case member with guide portion 36 and the locking member 3 with a spring support, and the joint between rings and the elastic body 37 are connected to each other. It is possible to make a series spring, which can stably reduce the tensile rigidity of the segment seismic joint, control the tensile force generated in the joint, and prevent the gap between the segment rings in the seismic joint structure part in the tunnel axis direction. It is possible to extend in the tunnel axis direction. As a result, the tensile force in the tunnel axis direction acting on the rigid joint structure portion that is installed apart in the tunnel axis direction is prevented from becoming extremely large.

  When practicing the present invention, when the coil spring 41 as the elastic body 37 is disposed between the side surface 11 and the spring receiving portion 40 so as to be connected to them, the coil spring 41 may function as a tension spring.

The principal part of the segment seismic joint structure of this invention is shown, (A) is CC sectional drawing in (B), (B) is a sectional side view of the said principal part. GG cross-sectional view of FIG. 1 (B) showing the rotation prevention mechanism that also serves as a guide for the engaging member, and the relationship between the locking member shaft portion of the male engaging member and the opening of the case member with guide portion. It is. It is a front view which shows one segment which should be connected. It is a front view which expands and shows the center part of FIG. It is a front view which shows the other segment which should be connected. It is a front view which expands and shows the center part of FIG. It is tunnel axial direction sectional drawing which isolate | separates and shows the seismic joint structure of the segment which concerns on embodiment of this invention. It is tunnel axial direction sectional drawing which shows the structure at the time of the connection of the seismic joint structure of the segment which concerns on embodiment of this invention. It is tunnel axial direction sectional drawing which shows the state with which normal temperature curable material was filled between adjacent segments. It is an enlarged partial view of the seismic joint structure of the segment in FIG. It is sectional drawing of the tunnel axial direction which shows the rigid joint structure of the segment ring (or segment) of the tunnel axial direction corresponding to the earthquake-resistant joint structure of this invention. It is sectional drawing of the tunnel axial direction which shows the rigid joint structure of the conventional segment ring (or segment) of a tunnel axial direction. It is sectional drawing of the tunnel axial direction which shows the conventional earthquake resistant joint structure of the segment ring (or segment) of a tunnel axial direction. It is a figure which shows the form which alternately arrange | positions the joint structure of rigid coupling, and the earthquake-resistant joint structure B to a tunnel axial direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Segment 2 Segment 3 Locking member 4 Locking protrusion 4a Rear surface 5 of locking protrusion Female side engaging member 6 Male side engaging member 7 Spring 8 Steel shell 9 Concrete 10 Tunnel axial direction side surface 11 Tunnel axial direction side surface 12 Slide stopper 12A Tapered surface 13 Flange 14 Insertion recessed part 15 Flange 16 Insertion protrusion 17 Room temperature curable material 18 Guide hole 19 Gap 20 Slide stopper holding frame 21 Fixing bolt 22 Thin steel plate 23 Guide material 24 also used to prevent slide stopper rotation 24 Presser pin 28 Connecting frame 29 Bolt insertion hole 31 Female screw 32 Pin hole 33 Split pin 34 Cylindrical case 35 Guide part 36 Case member 37 with guide part Elastic body 38 End plate 39 Opening part 40 Spring receiving part 41 Coil spring 42 Non-circular intermediate shaft part

Claims (4)

In order to connect the segments (1, 2) facing in the tunnel axis direction in the tunnel axis direction, the male engagement member (6) is connected to the tunnel axis direction side surface (11) of one segment (2), and the other segment ( 1) In the joint structure of the segment in which the female side engaging member (5) is provided on the side surface (10) in the tunnel axial direction, the male side engaging member (6) is provided with a locking projection (4) at the tip. A locking member (3) and the locking member (3) are spring-biased in the tunnel axial direction so as to be able to move forward and fixed to the side surface of the one segment (2), and the locking member (3) And a slide stopper holding frame (20) in which a female side engaging member (5) is fixed to a side surface of the other segment (1). ) And this holding frame 20) and a slide stopper (12) which is movably supported in the radial direction of the tunnel and is spring-biased in a direction to close the entry portion of the locking member (3) and can lock the locking protrusion (4). The non-circular intermediate shaft portion (42) of the locking member (3) moves to the non-circular opening (39) of the tip plate (38) of the case member with guide portion (36). A segmented earthquake-resistant joint structure , which is fitted so as to prevent the locking protrusion (4) at the tip of the locking member (3) from rotating . The seismic joint structure of the rigid coupling joint and the segment is disposed between the web sides facing each other of the segment rings adjacent in the tunnel axial direction, and the rigid joint structure including the rigid coupling joint is opposed to the tunnel axial direction. A second locking member having a second locking projection at the tip of the male engaging member provided on one side of the segment is spring-biased in a female engaging member provided on the other side. The second slide stopper that makes a pair is pushed open to enter, and the second locking member is fixed to the side surface in the axial direction of the segment by welding, and the second slide stopper is a female side engaging member. in the guide hole of the second slide stopper holding frame is constituted by being movable freely held in a tunnel radially in engagement member, the locking portion having a locking projection (4) at the tip Having a tunnel axial length dimension from the web side of the segment (3), said second locking projections in the rigid coupling joint for welded to the tunnel axis side of the segment (11) (4) The seismic joint structure for a segment according to claim 1, wherein the second locking member has the same length as the length in the tunnel axis direction. The seismic joint for a segment according to claim 1 or 2, wherein the locking member (3) is spring-biased in a backward movement direction so that a base end portion thereof abuts a side surface of the one segment. Construction. The cylindrical elastic body such as a coil spring, a fiber reinforced rubber, or an epoxy resin is used as an elastic body that biases the locking member (3) in the backward movement direction in the tunnel axis direction. The seismic joint structure of the segment in any one of 1-3 .

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