JP2009228312A - Joint structure of segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of a segment, which enables the segments to be joined together by properly coupling male and female joints together, even in the case that the cost of the joint structure becomes lower by employing the steel male and female joints. <P>SOLUTION: Each of the male and female joints 21 and 20 is made of steel; the male joint 21 is provided with an engaging portion 23 which is connected to the sides of both ends of a shank 15 or the side of one end thereof, and formed in such a shape as to have an approximately H-shaped or approximately T-shaped cross section; and the female joint 20 is provided with a pair of side plate portions 8 and 9, a bottom plate portion 10 which is continuously provided by connecting the pair of side plate portions 8 and 9 together and a pair of locking piece portions 11 and 12 which are connected to inner surfaces 8a and 9a of the pair of side plate portions 8 and 9 and protrusively provided inside, and formed in such a shape as to have an approximately C-shaped cross section. When the engaging portion 23 of the male joint 21 is fitted into the fitting space 6 of the female joint 20, either of an engaging surface of the engaging portion 23 and a locking surface of each of the locking piece portions 11 and 12, which are locked to each other in the state of abutting on each other, is formed in a convex arc shape in a cross-sectional view in a fitting direction O1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a joint structure for integrally joining segments that are installed on an inner surface of a tunnel excavated by a shield method or the like and form a cover.

  Conventionally, on the inner surface of the tunnel T excavated by a shield method or the like, as shown in FIG. 8, for example, a plurality of arc-disc segments 1 having a curvature radius substantially equal to the radius of curvature of the inner surface of the excavation are continuous in the circumferential direction. An annular segment ring body 2 is provided that covers and supports the inner surface of the excavation in the circumferential direction. Then, the segment ring bodies 2 that support the circumferential inner surface of the excavation are connected so as to be continuous in the tunnel axis direction O1, and a tunnel T lining that covers and supports the inner surface of the excavation is formed. At this time, adjacent segments 1 are joined together using joint structures 3 and 4 including male joints and female joints.

  Further, for example, the joint structure (joint joint) 4 for joining the segments 1 adjacent to each other in the circumferential direction of the tunnel T can secure a large joint strength against the load in the radial direction of the tunnel T, and the inner surface of the segment 1 A joint structure called a so-called horizontal cotter is used because of the advantage that irregularities are not formed on the surface (see, for example, Patent Document 1).

In this horizontal cotter type joint structure 4, for example, as shown in FIG. 9, a female joint (C-type hardware) 5 having a substantially C-shaped cross section is fitted in a space where each joint end face 1 a of adjacent segments 1 is opposed to each other. 6 is opened to the joining end face 1a and is provided integrally with each segment 1 in a state of extending in the tunnel axis direction O1. Then, a male joint (H-shaped metal fitting) 7 having a substantially H-shaped cross section is slid in the tunnel axial direction (fitting direction) O1 in the fitting space 6 of each female joint 5 of the adjacent segments 1 and the both ends thereof. (Both flange portions (engagement portions) 7a side) are fitted. Thereby, the female joints 5 are connected to each other through the male joint 7, and the joining end faces 1 a of the segments 1 are joined to each other.
JP 2001-300930 A

  By the way, since the female joint 5 and the male joint 7 of the conventional horizontal cotter-type joint structure 4 are generally manufactured as castings, there is a problem of high cost.

  On the other hand, for example, the female joint 5 is made of steel, and as shown in FIG. 10, the pair of side plate portions 8 and 9 and the bottom plate portion 10 connected to one end side of the pair of side plate portions 8 and 9 are connected. And a pair of locking pieces 11 and 12 that are welded to the inner surfaces 8a and 9a on the other end side of each of the pair of side plate portions 8 and 9 and project inwardly, and the female joint 5 It is conceivable to reduce the cost of the joint structure 4.

  However, when only the female joint 5 is made of steel and a male joint 7 manufactured as a casting similar to the conventional one is used, the male joint 7 is manufactured as a casting, as shown in FIG. The flange surface 7b (engagement surface of the engagement portion) is formed with an inclination angle θ of about 2 °, for example. When the flange portion 7a of the male joint 7 is fitted in the fitting space 6 of the female joint 5, the flange surface 7b of the flange portion 7a and the locking piece portion 11 of the female joint 5 are locked. The surface 11a comes into point contact in a cross-sectional view in the fitting direction (tunnel axis direction O1), and the flange surface 7b and the locking surface 11a come into contact with each other on the leading end side in the protruding direction of the locking piece portion 11. . For this reason, the joining force N acts as a concentrated load from the male joint 7 to the distal end side of the latching piece portion 11 of the female joint 5, the point of action where this joining force N acts, and the latching piece connected to the side plate portion 8. The distance L1 with the fulcrum (welded part 13 and 14) of the rear end of the part 11 becomes large. Thereby, since the big bending moment M acts on the welding parts 13 and 14, there exists a possibility that the locking piece part 11 may drop out from the side plate part 8 (the locking piece part 11 is damaged).

  On the other hand, as shown in FIG. 12, the male joint 7 is made of steel, and a flat plate-like engaging portion so as to protrude outward in the orthogonal direction to the one surface 15 a and the other surface 15 b on both ends of the flat plate-like shaft portion 15. It is also conceivable that the male joint 7 having a substantially H-shaped cross section is formed by welding 16.

  And when the end part (engagement part 16) of such a male joint 7 was fitted in the fitting space 6 of the female joint 5, as shown in FIG. 16a and the locking surface 11a of the locking piece portion 11 come into surface contact, so that the joining force N acts as an evenly distributed load from the male joint 7 to the locking piece portion 11 of the female joint 5. For this reason, compared with the case where the male joint manufactured as the conventional casting is used for the welding part 13 which connects the rear end of the latching piece part 11 to the side-plate part 8, a big bending moment does not act.

  However, even when the engagement surface 16a of the engagement portion 16 and the engagement surface 11a of the engagement piece portion 11 are brought into surface contact in this way, the engagement surface 11a of the engagement piece portion 11 and the side plate portion 8 The inner surface 8a cannot be welded, or the engaging surface 16a of the engaging portion 16 and the one surface 15a or the other surface 15b of the shaft portion 15 cannot be welded, that is, the locking surface 11a and the inner surface 8a of the side plate portion 8 intersect. It becomes impossible to provide the corner welded portion 14 or the corner welded portion 17 where the engagement surface 16a and the one surface 15a or the other surface 15b of the shaft portion 15 intersect, and the locking piece portion 11 and the side plate portion 8. There arises a problem that the connection strength between the engaging portion 16 and the shaft portion 15 cannot be sufficiently secured. For this reason, there is a risk that the locking piece 11 and the engaging portion 16 will drop off (be damaged).

  In view of the above circumstances, the present invention can suitably connect the male joint and the female joint and join the segments to each other even when the male joint and the female joint are made of steel to reduce the cost of the joint structure. It aims at providing the joint structure of a segment.

  In order to achieve the above object, the present invention provides the following means.

  The joint structure of the segment of the present invention is a joint of a segment comprising a male joint and a female joint integrally provided in the segment in a state where a fitting space into which the male joint is fitted is opened at the joint end surface of the segment In the structure, each of the male joint and the female joint is made of steel, and the male joint is formed to have a substantially H-shaped cross section or a substantially T-shaped cross section with engaging portions connected to both end sides or one end side of the shaft portion. The female joint includes a pair of side plate portions, a bottom plate portion connected to the pair of side plate portions, and a pair of latches projecting inwardly connected to the inner surfaces of the pair of side plate portions. The male joint is formed in the fitting space of the female joint, which is formed in a substantially C-shaped cross section with a piece, and is surrounded by the pair of side plates, the bottom plate, and the pair of locking pieces. When the engaging portions are fitted, the above-mentioned engagements are brought into contact with each other and locked. Either side of the locking surface of the locking piece portion and the engaging surface of the part is characterized in that it is formed in a convex arc shape in cross section in the fitting direction.

  In the present invention, since the male joint and the female joint are each made of steel, it is possible to reduce the cost as compared with the conventional one manufactured by casting. Then, when the male joint is connected to the female joint, one of the engaging surface of the engaging portion and the engaging surface of the locking piece portion that are brought into contact with each other and locked is formed in a convex arc shape. As a result, the engagement surface and the engagement surface make point contact in a cross-sectional view in the mating direction, and this abutting portion (operation point) is the rear end side (side plate portion side) in the protruding direction of the engagement piece portion. Can be located. Thereby, the action point of the joining force acting on the locking piece portion of the female joint from the engaging portion of the male joint is located on the fulcrum side (the rear end side of the locking piece portion) connected to the side plate portion, It is possible to reduce the bending moment acting on the connecting portion (welded portion) between the side plate portion and the locking piece portion. Therefore, even when the male joint and the female joint are each made of steel, it is possible to prevent the locking piece portion from dropping (damaging).

  Further, even when the action point is brought closer to the fulcrum side in this way, either one of the engagement surface of the engagement portion and the engagement surface of the engagement piece portion is formed in a convex arc shape. In addition, a welded portion can be provided at a corner where the locking surface and the inner surface of the side plate portion intersect, or at a corner where the engaging surface and one surface of the shaft portion or the other surface intersect, and the locking piece portion and the side plate portion, It is possible to sufficiently secure the connection strength between the engaging portion and the shaft portion. Therefore, also from this point, it is possible to prevent the male and female joints manufactured as steel from being damaged.

  Moreover, in the segment joint structure of this invention, it is desirable that the said engaging part or the said locking piece part is formed using the cylindrical rod-shaped member.

  In this invention, the engaging surface of the engaging portion or the locking surface of the locking piece portion is easily projected by forming the engaging portion or the locking piece portion using a cylindrical rod-shaped member such as round steel. It can be formed in an arc shape, and it is possible to reliably and easily bring the point of application of the joining force closer to the fulcrum side.

  Furthermore, in the joint structure of a segment of the present invention, the engaging portion and / or the locking piece portion includes a wedge portion arranged in parallel in the fitting direction, and the engaging surface and / or the locking surface. May be formed in a sawtooth shape.

  In this invention, the engagement surface and / or the locking surface are formed in a sawtooth shape by the wedge portion, so that the wedge portions on both sides are engaged with each other, or one wedge portion is bitten into the other surface. Thus, the engaging portion and the locking piece portion can be firmly engaged. Thereby, a male joint and a female joint can be connected firmly, and it becomes possible to join segments reliably and suitably integrally.

  According to the joint structure of the segment of the present invention, even when the male joint and the female joint are made of steel to reduce the cost of the joint structure, the engagement surface of the engagement portion and the engagement piece portion are engaged. By forming any one surface of the stop surface in a convex arc shape, the bending moment acting on the connecting portion between the locking piece portion and the side plate portion can be reduced, and further, the locking piece portion and the side plate portion, It is possible to sufficiently secure the connection strength between the engaging portion and the shaft portion. Therefore, it becomes possible to join the segments by suitably connecting the male joint and the female joint.

  A segment joint structure according to an embodiment of the present invention will be described below with reference to FIGS. The present embodiment relates to a joint structure for integrally joining segments installed on the inner surface of a tunnel excavated by a shield method or the like, and in particular, by sliding the joint end surfaces of adjacent segments facing each other. It relates to a structure of a horizontal cotter type joint between pieces. In the following description, the same reference numerals are assigned to the components common to the segments and the joint structures of the segments shown in FIGS.

  As shown in FIG. 1, the segment joint structure A of the present embodiment has a pair of female joints 20 integrally provided on the side of the joining end face 1a of adjacent segments 1 (only one female joint in FIG. 1). And a male joint 21 for joining the segments 1 to each other by connecting to a pair of opposing female joints 20 of adjacent segments 1.

  The female joint 20 is a steel C-shaped joint, and a pair of side plate portions 8 and 9, a bottom plate portion 10 connected to one end sides of the pair of side plate portions 8 and 9, and a pair of side plates. The rear ends of the portions 8 and 9 are connected to the inner surfaces 8a and 9a on the other end side, projecting inwardly perpendicular to the inner surfaces 8a and 9a of the side plate portions 8 and 9, and the fitting direction (tunnel axial direction O1) ) And a pair of flat-plate-like locking pieces 11 and 12. As a result, the female joint 20 is formed with a fitting space 6 having a T-shaped cross section surrounded by the pair of side plate portions 8 and 9, the bottom plate portion 10 and the pair of locking piece portions 11 and 12.

  Further, as shown in FIGS. 1 and 2, the pair of locking pieces 11 and 12 are connected to the inner surfaces 8 a and 9 a of the pair of side plate portions 8 and 9 by welding, respectively. At this time, the pair of locking pieces 11 and 12 are provided with one surface 11b and 12b facing the joining end surface 1a side, the inner surfaces 8a and 9a of the side plate portions 8 and 9, and the other surface facing the bottom plate portion 10 side (the locking surface 11a). 12a) and the inner surfaces 8a and 9a of the side plate portions 8 and 9, that is, both sides of the one surface 11b and 12b side and the other surface 11a and 12a side are connected by welded portions 13 and 14 by fillet welding. Accordingly, the pair of locking pieces 11 and 12 are connected to the side plate portions 8 and 9 with sufficient connection strength by the welded portions 13 and 14, respectively.

  The female joint 20 is provided with anchors 22 welded to the outer surfaces of the pair of side plate portions 8 and 9, and these anchors 22 are fixed to the concrete inside the segment 1. The joint 20 is firmly integrated with the segment 1. And the female joint 20 is installed in the state which distribute | arranged the edge part of a pair of side-plate parts 8 and 9 to the joining end surface 1a side of the segment 1, and made the fitting space 6 open to this joining end surface 1a. At this time, the female joint 20 is installed such that the extending direction of the fitting space 6 is along the tunnel axis direction O1 in a state where the segment 1 is arranged at a predetermined position of the tunnel T.

  On the other hand, the male joint 21 is an H-shaped joint made of steel. As shown in FIGS. 3 to 5, the flat joint 15, one surface 15 a and the other face 15 b on both ends of the shaft 15 are provided. They are connected to each other, and are provided with engaging portions 23 provided so as to protrude outward in the orthogonal direction between the one surface 15a and the other surface 15b, and are formed in a substantially H-shaped cross section. Moreover, in this embodiment, each engaging part 23 is formed using a round steel (cylindrical bar-shaped member). And each round steel (engagement part 23) is provided with the length substantially equivalent to the length of the fitting direction O1 of the axial part 15, The outer surface (circumferential surface) is one surface 15a of the axial part 15, or the other surface 15b. And is connected to the shaft portion 15 by welding. At this time, the welded portions 24 and 25 that connect the round steel 23 to the shaft portion 15 are provided on both sides in the circumferential direction with the contact portion P <b> 1 in contact with the shaft portion 15 on the outer surface of the round steel 23 interposed therebetween. That is, each round steel 23 is connected to one surface 15a or the other surface 15b of the shaft portion 15 by the welded portions 24 and 25 on both sides in the circumferential direction across the contact portion P1. Thereby, each engaging part 23 is connected to the axial part 15 with sufficient connection strength by each welding part 24,25.

  When the adjacent segments 1 are joined by the female joint 20 and the male joint 21 configured as described above, as shown in FIG. 1, one end of the male joint 21 (a pair of engagements on one end side). Part 23) is fitted into the fitting space 6 of the female joint 20 of one segment 1 from the side end side. At this time, the other end of the male joint 21 fitted to one segment 1 protrudes outward with a predetermined dimension from the joining end surface 1a of the one segment 1 with high accuracy.

  Next, the other end portion side (a pair of engaging portions 23 on the other end portion side) of the male joint 21 protruding outward from the joining end surface 1a of one segment 1 in this way is the other segment 1 shown in FIG. It inserts in the insertion port 26, slides in the tunnel axial direction O1, and fits into the fitting space 6 of the female joint 20 of the other segment 1 from the side end portion side. Thereby, both the female joints 20 are connected via the male joint 21, and the joining end surfaces 1 a of the adjacent segments 1 are pressed together to join the segments 1 to each other.

  When the female joint 20 and the male joint 21 are connected and the segments 1 are joined to each other as described above, as shown in FIG. 2, the bottom plate portion 10 side of the locking pieces 11 and 12 of the female joint 20 is used. The flat engaging surfaces 11a, 12a facing the surface and the convex arcuate engaging surface facing the joining end surface 1a side of the engaging portion 23 of the male joint 21 (one of the outer surface of the round steel and the convex arc shape) Surface) 23a abuts and is locked. At this time, since the engagement surface 23a is formed in a convex arc shape using round steel for the engagement portion 23, the engagement surfaces 11a, 12a and The engagement surface 23a is in point contact (contact portion P2), and this contact portion P2 is a locking piece compared to the case where the male joint 7 manufactured as the conventional casting shown in FIGS. 10 and 11 is used. It will be located in the rear end (fulcrum, welded part 13 and 14) side connected to the side plate parts 8 and 9 of the parts 11 and 12.

  Thereby, in the joint structure A of the segment of this embodiment, the operating point of the joining force N acting as a concentrated load from the engaging portions 11 and 12 of the male joint 21 to the locking pieces 11 and 12 of the female joint 20 ( The distance L2 between the contact portion P2) and the fulcrum of the rear end of the locking piece portions 11 and 12 connected to the side plate portions 8 and 9 is greater than the distance L1 when the male joint 7 manufactured as a conventional casting is used. Becomes smaller. Therefore, a large bending moment M does not act on the welded portions 13 and 14, and the locking pieces 11 and 12 fall off from the side plate portions 8 and 9 (the locking pieces 11 and 12 are damaged). Is prevented.

  Further, since the engaging surface 23a is formed in a convex arc shape, the engaging surface 23a is directed from the contact portion P2 toward the side plate portions 8 and 9 in a state where the female joint 20 and the male joint 21 are connected. As the distance from the locking surfaces 11a and 12a gradually increases, the distance from the locking surfaces 11a and 12a gradually decreases from the contact portion P2 toward the one surface 15a or the other surface 15b of the shaft portion 15. For this reason, even when the action point (contact portion P2) is brought closer to the fulcrum side, the welded portion 14 provided at the corner where the locking surfaces 11a, 12a and the inner surfaces 8a, 9a of the side plate portions 8, 9 intersect is provided. The engaging part 23 does not interfere. Further, the distal end sides of the locking pieces 11 and 12 do not interfere with the welded portion 25 provided at the corner where the engaging surface 23a and the one surface 15a or the other surface 15b of the shaft portion 15 intersect. Thereby, the connection strength of each of the latching piece portions 11 and 12 and the side plate portions 8 and 9 and the engaging portion 23 and the shaft portion 15 is sufficiently secured by the welded portions 14 and 25, and also from this point, the female joint 20. And the male joint 21 is prevented from being damaged.

  Therefore, in the joint structure A of the segment of this embodiment, since the male joint 21 and the female joint 20 are each made of steel, the cost can be reduced as compared with the case where it is manufactured by casting as in the prior art. Is possible. And among the engaging surfaces 23a of the engaging portions 23 and the engaging surfaces 11a and 12a of the engaging pieces 11 and 12, which are brought into contact with and engaged with each other when the male joint 21 is connected to the female joint 20, By forming the engaging surface 23a into a convex arc shape, the engaging surface 23a and the locking surfaces 11a, 12a can be brought into point contact in a cross-sectional view in the fitting direction O1, and this abutting portion (operation point) P2 can be positioned on the rear end side (side plate portions 8 and 9 side) of the locking piece portions 11 and 12. Thereby, the point of action of the joining force N acting on the locking pieces 11 and 12 of the female joint 20 from the engaging part 23a of the male joint 21 is located on the fulcrum side connected to the side plate parts 8 and 9, It is possible to reduce the bending moment M acting on the welded portions 13 and 14 that connect the side plate portions 8 and 9 and the locking piece portions 11 and 12. Therefore, even when the male joint 21 and the female joint 20 are each made of steel, it is possible to prevent the locking pieces 11 and 12 from dropping (damaging).

  Even when the action point P2 is brought closer to the fulcrum side in this way, the engaging surfaces 23a are formed in a convex arc shape, so that the locking surfaces 11a, 12a and the inner surfaces 8a of the side plates 8, 9 are Welded portions 14 and 25 can be provided at the corners where 9a intersects, or at the corners where the engaging surface 23a and one surface 15a or the other surface 15b of the shaft portion 15 intersect, and the locking pieces 11 and 12 and the side plate It is possible to sufficiently secure the connection strength between the portions 8 and 9 and the engaging portion 23 and the shaft portion 15. Therefore, it can prevent more reliably that damage arises in the male joint 21 and the female joint 20 which were manufactured as steel.

  Further, by using round steel (cylindrical bar-like member) for the engaging portion 23, the engaging surface 23a of the engaging portion 23 can be easily formed in a convex arc shape, and the joining force N can be reliably and easily obtained. It is possible to bring the action point P2 closer to the fulcrum side.

  Therefore, according to the joint structure A of the segment of this embodiment, even when the male joint 21 and the female joint 20 are made of steel to reduce the cost of the joint structure A, the engagement portion 23 is engaged. By forming the surface 23a into a convex arc shape, the bending moment M acting on the fulcrum (welded parts 13, 14, 24, 25) can be reduced, and the locking pieces 11, 12 and the side plate parts 8, 9. Since the connection strength between the engagement portion 23 and the shaft portion 15 can be sufficiently secured, the male joint 21 and the female joint 20 can be suitably connected to join the segments 1 to each other. Become.

  In addition, this invention is not limited to said one Embodiment, In the range which does not deviate from the meaning, it can change suitably. For example, in the present embodiment, the engaging surface 23a of the engaging portion 23 is formed in a convex arc shape so that the action point P2 is brought closer to the fulcrum side, and the bending moment M acting on the fulcrum is reduced. The engaging surfaces 11a and 12a of the engaging pieces 11 and 12 are formed in a convex arc shape, the engaging surface 23a of the engaging portion 23 is formed in a flat shape, and the planar engaging surface 23a and the convex circle are formed. You may make it make contact | abutting part P2 (action point) with which arc-shaped locking surfaces 11a and 12a contact | abut approach the fulcrum side. In this case as well, as in this embodiment, the bending moment M acting on the fulcrum can be reduced, and the locking pieces 11 and 12 can be prevented from being damaged (dropped off). Also in this case, the corner where the locking surfaces 11a, 12a and the inner surfaces 8a, 9a of the side plates 8, 9 intersect, and the engagement surface 23a and the one surface 15a or the other surface 15b of the shaft portion 15 intersect. Since it is possible to provide the welded portions 14 and 25 at the corners, the connection strengths of the locking pieces 11 and 12 and the side plate portions 8 and 9 and the engaging portion 23 and the shaft portion 15 are sufficiently secured. It is possible.

  Moreover, in this embodiment, although the convex arc-shaped engaging surface 23a was formed by using a round steel (cylindrical rod-shaped member) for the engaging part 23, this invention latches with the engaging surface 23a. It is sufficient that only one of the surfaces 11a and 12a is formed in a convex arc shape, and the engaging portion 23 or the locking piece portions 11 and 12 are formed using a cylindrical rod-shaped member. There is no need to limit.

  Furthermore, for example, as shown in FIG. 6, the engaging portion 23 is formed with a wedge portion 23b arranged in parallel in the fitting direction O1, or the locking pieces 11 and 12 are arranged in parallel in the fitting direction O1. The engagement surface 23a and / or the locking surfaces 11a and 12a may be formed in a sawtooth shape. When the engagement surface 23a (locking surfaces 11a, 12a) is formed in a sawtooth shape, the engagement pieces 23, 12 (engagement portion 23) are formed using mild steel. The wedge portion 23b of the mating surface 23a (locking surfaces 11a, 12a) is bitten into the locking surfaces 11a, 12a (engaging surface 23a), and the engaging portion 23 and the locking piece portions 11, 12 are firmly engaged. Can be combined. Thereby, the male joint 21 and the female joint 22 can be connected firmly, and it becomes possible to join the segments 1 integrally and reliably.

  Further, when the engaging portion 23 and the locking piece portions 11 and 12 are both formed with wedge portions and the engaging surface 23a and the locking surfaces 11a and 12a are formed in a sawtooth shape, the male joint 21 is By engaging with the fitting space 6 of the female joint 22 and engaging the wedge portions with each other, the engaging portion 23 and the locking piece portions 11 and 12 can be more firmly engaged. .

  Furthermore, in this embodiment, the male joint 21 is formed to have a substantially H-shaped cross section by connecting the engaging portions 23 to the one surface 15a and the other surface 15b on both end sides of the flat plate-shaped shaft portion 15, respectively. However, for example, as shown in FIG. 7, the engaging portion 23 is connected to one surface 15a and the other surface 15b of one end side (one end side) of the shaft portion 15 so that the male joint 21 has a substantially T-shaped cross section. It may be formed. In this case, the anchor 30 is attached to the other end portion side of the male joint 21, and the anchor 30 is fixed, thereby causing the male joint 21 to protrude outward from the joining end face 1a. In this state, it is installed integrally with one segment 1. And the one end part side (a pair of engaging part 23 of one end part side) which protruded outside from the joining end surface 1a of this male joint 21 is inserted into the fitting space 6 of the female joint 20 of the other segment 1 from the side end part side. By fitting, it is possible to obtain the same effect as this embodiment.

  Further, in the present embodiment, the segment joint structure A is described as an inter-piece joint, but the segment joint structure of the present invention is a ring for joining the segments 1 adjacent to each other in the tunnel axial direction O1. You may employ | adopt as a joint. In the present embodiment, the segment 1 is described as being a concrete segment. However, the joint structure of the segment of the present invention may be used for a concrete filling segment, a steel segment, or the like.

It is a figure which shows the joint structure of the segment which concerns on one Embodiment of this invention. It is the figure which expanded the S section of FIG. It is a figure which shows the male joint of the joint structure of the segment which concerns on one Embodiment of this invention. FIG. 4 is a view taken along line X1-X1 in FIG. 3. FIG. 4 is a view taken along line X2-X2 in FIG. 3. It is a figure which shows the modification of the joint structure (male joint) of the segment which concerns on one Embodiment of this invention. It is a figure which shows the modification of the joint structure (male joint) of the segment which concerns on one Embodiment of this invention. It is a perspective view which shows the state which installs a segment in a tunnel. It is a figure which shows the joint structure of the segment manufactured as the conventional casting. It is a figure which shows the joint structure of the segment which made only the female joint steel. It is the figure which expanded the S section of FIG. It is a figure which shows the joint structure of the segments made from steel which manufactured the engaging surface and the latching surface as a plane. It is the figure which expanded the S section of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Segment 1a Joint end surface 2 Segment ring body 6 Fitting space 8 Side plate part 8a Inner surface 9 Side plate part 9a Inner surface 10 Bottom plate part 11 Locking piece part 11a Locking surface part 12 Locking piece part 12a Locking surface 13 Welding part 14 Welding part 15 Shaft portion 15a One surface 15b Other surface 20 Female joint 21 Male joint 22 Anchor 23 Engaging portion (round steel)
23a Engagement surface 23b Wedge portion 24 Welded portion 25 Welded portion A Segment joint structure L1 Distance from acting point to fulcrum L2 Distance from acting point to fulcrum M Bending moment N Joint force O1 Tunnel axis direction (fitting direction)
P1 contact part P2 contact part (point of action)
T tunnel

Claims (3)

In a joint structure of a segment consisting of a male joint and a female joint integrally provided in the segment in a state where a fitting space into which the male joint is fitted is opened at the joining end face of the segment,
The male joint and the female joint are each made of steel,
The male joint is provided with an engaging portion connected to both end sides or one end side of the shaft portion, and is formed to have a substantially H-shaped section or a substantially T-shaped section.
The female joint includes a pair of side plate portions, a bottom plate portion connected to the pair of side plate portions, and a pair of locking piece portions projecting inwardly connected to inner surfaces of the pair of side plate portions. Are formed in a substantially C-shaped cross section,
When the engaging portion of the male joint is fitted in the fitting space of the female joint surrounded by the pair of side plate portions, the bottom plate portion, and the pair of locking piece portions, One of the engaging surface of the engaging portion to be locked and the locking surface of the locking piece portion is formed in a convex arc shape in a sectional view in the fitting direction. Joint structure. In the joint structure of the segment according to claim 1,
The joint structure of a segment, wherein the engaging portion or the locking piece portion is formed using a cylindrical bar-shaped member. In the joint structure of the segment according to claim 1 or 2,
The engaging portion and / or the locking piece portion includes a wedge portion arranged in parallel in the fitting direction, and the engaging surface and / or the locking surface is formed in a sawtooth shape. Characteristic segment joint structure.

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