JP2008207412A - Manufacturing method of segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a segment which enables a female type joint to be accurately arranged in a predetermined position without requiring a machining processing such as forming a screw hole or cutting a distal end portion, and manufacturing cost of the female type joint consequently the segment to be reduced. <P>SOLUTION: The female type joint 20 is arranged with a T-shaped jig 30 engaged in a fitting space 6, a threading member 32 is threaded in a screw hole 30h formed in the T-shaped jig 30, the female type joint 20 is moved so as to be spaced apart from the inner face 31b of a mold form 31 by pushing and pressing the bottom face 22a of the fitting space 6 by the distal end 32c of the threading member 32, the T-shaped jig 30 is moved so as to come closer to the inner face 31b of the mold form 31, the positioning of the T-shaped jig 30 is carried out by bringing the end portion 30i of the T-shaped jig 30 into contact with the inner face 31b of the mold frame 31, the inner face 20p forming the fitting space 6 come into contact with the outer face 30f of the T-shaped jig 30 to engage with the female type joint 20, so that the female type joint 20 is arranged while positioning the same in the predetermined position inside of the mold form 31. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a segment that is installed in a tunnel excavated by a shield method or the like to form a lining.

  Conventionally, on the inner surface of the tunnel T excavated by a shield method, for example, as shown in FIG. 21, a plurality of arc-shaped segments 1 having a radius of curvature substantially equal to the radius of curvature of the inner surface of the excavation are continuously provided in the circumferential direction. An annular segment ring body 2 that is provided and supports the inner surface of the circumferential excavation is formed. The segment ring bodies 2 that support the inner surface of the excavation in the circumferential direction are connected so as to be continuous in the direction of the axis O1 of the tunnel T, thereby forming a cover of the tunnel T that covers and supports the inner surface of the excavation. At this time, the adjacent segments 1 are integrally joined using joint structures 3 and 4 including a male joint and a female joint.

  In particular, the joint structure (intersegment joint) 4 for joining the segments 1 adjacent to each other in the circumferential direction of the tunnel T can secure a large 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 no irregularities are formed on the surface. As shown in FIG. 22, this horizontal cotter type joint structure 4 has a C-shaped bracket (female joint, C-type joint) having a substantially C-shaped cross section at a position opposed to each joining end face 1a of adjacent segments 1. 5 is embedded in each segment 1 (concrete) by opening the fitting space 6 in the joining end face 1a and extending in the direction of the tunnel T axis O1. Then, in the fitting space 6 of each C-shaped bracket 5 of each adjacent segment 1, both end portions (both flange portions) 7a of an H-shaped bracket (male joint, H-shaped joint) 7 having a substantially H-shaped cross section. Are fitted together, the C-shaped brackets 5 are connected to each other via the H-shaped bracket 7, and the joining end faces 1 a of the segments 1 are joined to each other.

  On the other hand, when manufacturing the segment 1 using a horizontal cotter type joint structure, as shown in FIG. 23, a formwork is formed so as to form an arcuate disk-shaped inner space (inner space for placing concrete). 8 is assembled, and the C-shaped metal fitting 5 is fixed and installed at a predetermined position in the mold 8 with bolts 9 so that the inner surface 8a of the mold 8 and the tip 5a where the fitting space 6 opens are in contact with each other. (For example, refer to Patent Document 1). For this reason, the C-shaped bracket 5 has a screw hole 10 for opening and recessing in the bottom surface 5b forming the fitting space 6 and screwing a bolt 9 inserted from the outside of the mold 8 into the fitting space 6. Is formed.

Further, as shown in FIG. 23, the C-shaped metal fitting 5 is arranged such that a pair of engaging portions 5d formed in a bowl shape having an engaging piece portion 5c at the distal end portion 5a face each other. Opposite sides of the locking part 5d of the locking part 5d are connected by a connecting part 5e, and a fitting space 6 surrounded by the pair of locking parts 5d and the inner surface of the connecting part 5e is formed. Yes. And from the surface 5f which faces the segment 1 inner side (connecting part 5e side) of the latching piece part 5c on the relationship which makes the H-shaped metal fitting 7 fit in such a fitting space 6, and joins the segments 1 mutually. The dimension d1 up to the tip 5a (joint end face 1a), that is, the thickness d1 of the locking piece 5c is accurately formed, and the H-shaped metal fitting 7 is suitably fitted to ensure that the segments 1 are in a predetermined position. It is important to be able to connect. For this reason, the C-shaped metal fitting 5 that is generally manufactured as a casting is formed by increasing the thickness d1 dimension of the locking piece 5c in advance, and cutting the tip 5a for each C-shaped metal fitting 5 by machining. The dimensional accuracy of the locking piece 5c is ensured.
JP 2001-300930 A

  However, in the manufacturing method of the segment 1, it is necessary to process the screw hole 10 in the C-shaped bracket 5 in order to fix and install the C-shaped bracket 5 at a predetermined position in the mold 8. In order to ensure the thickness d1 dimensional accuracy of the locking piece 5c with respect to a large amount of the C-shaped bracket 5, it is necessary to individually cut the tip 5a by machining, so the cost of the C-shaped bracket 5 and the segment There was a problem that the manufacturing cost of No. 1 was high.

  In view of the above circumstances, the present invention can accurately install a female joint at a predetermined position without requiring machining such as formation of a screw hole or cutting of a tip portion, and the production cost of a female joint and thus a segment can be obtained. An object of the present invention is to provide a method for manufacturing a segment capable of reducing the above.

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

  In the method for manufacturing a segment according to the present invention, a T-shaped fitting space into which a male joint for joining adjacent segments is fitted is opened at the joining end face of the segment and is arranged in an embedded state in the concrete. A method of manufacturing a segment including a female joint, wherein a tip end portion of the fitting space is opposed to an inner surface of a mold frame in a state where a T-shaped jig is engaged with the fitting space. The female joint is disposed, and a screwing member is inserted from the outside of the mold into the hole of the mold and the fitting space, and screwed into a screw hole formed in the T-shaped jig. Then, by further screwing in the screwing member, the bottom of the fitting space is pressed by the tip of the screwing member inserted through the T-shaped jig so that the female joint is separated from the inner surface of the mold frame. And move the T-shaped jig closer to the inner surface of the formwork. And positioning the T-shaped jig by bringing the end of the T-shaped jig protruding outward from the tip of the female joint into contact with the inner surface of the mold. The female joint is positioned at a predetermined position in the mold frame by engaging the female joint with the inner surface forming the fitting space coming into contact with the outer surface of the T-shaped jig. It is characterized by doing.

  In the present invention, by forming the dimensions of the T-shaped jig and the screwing member with high accuracy, the female joint can be accurately set at a predetermined position. At this time, since the end of the T-shaped jig protruding outward from the tip of the female joint comes into contact with the inner surface of the mold, the female joint is installed at a predetermined position. A gap is necessarily formed between the inner surface of the mold and the mold. Therefore, the distance from the inner surface of the female joint that contacts the outer surface of the T-shaped jig to lock the female joint to the tip, that is, from the surface 5f facing the connecting portion 5e in FIG. 23 to the tip 5a. Even when the thickness d1 of the locking piece 5c is different, the inner surface of the mold frame (joint end surface of the segment) extends from the inner surface of the female joint that securely contacts the outer surface of the T-shaped jig to lock the female joint. ) Can be secured with high accuracy and the female joint can be installed. This eliminates the need to cut the tip of the female joint (C-shaped bracket) by machining as in the conventional method of manufacturing a segment.

  In addition, unlike the conventional segment manufacturing method, a screw hole for installing at a predetermined position in the mold is not formed in the female joint, and the T-shaped jig having the screw hole and the screwing member are used. The female joint can be installed with high accuracy, and such a T-shaped jig has the concrete placed in the mold where the female joint is installed hardened to remove the screwing member and remove the mold. Since it can be recovered from the fitting space of the female joint at a stage, the T-shaped jig in which the screw hole is formed can be used every time the segment is manufactured.

  In the segment manufacturing method of the present invention, it is preferable that the female joint is formed with a fitting hole into which an end of the screwing member is fitted on an inner surface forming the fitting space.

  In this invention, when the female joint is installed in the mold, the tip of the screwing member is fitted into the fitting hole, and the female mold with respect to the extending direction of the inner surface of the mold (joint end surface of the segment) The joint can be positioned.

  According to the method of manufacturing a segment of the present invention, a female joint can be accurately installed at a predetermined position in a mold without requiring machining such as forming a screw hole or cutting a tip of the female joint. For this reason, it is possible to reduce the manufacturing cost of the female joint and thus the segment.

  A segment manufacturing method according to an embodiment of the present invention will be described below with reference to FIGS. The present embodiment relates to a method for manufacturing a lining segment installed on the inner surface of a tunnel excavated by, for example, a shield method, and more particularly to a method for manufacturing a concrete segment having a horizontal cotter type joint structure.

  As shown in FIG. 1, the inter-segment joint 4 of the segment 1 of the present embodiment includes a pair of female joints 20 embedded in the concrete 1 b on the joining end face 1 a side of the adjacent segments 1 and the adjacent segments. And a male joint 21 that connects a pair of opposing female joints 20 to each other.

  Each of the pair of female joints 20 is a C-type joint in which, for example, a casting or the like is formed in a substantially C-shaped cross section, one female joint is a leading female joint 20a, and the other female joint is fitted. The combined female joint 20b is used. As shown in FIGS. 2 to 7, each female joint 20 (20 a, 20 b) has a front female joint 20 a shown in FIGS. 2 to 4 and a fitting female joint 20 b shown in FIGS. 5 to 7. A pair of locking portions 20e formed in a bowl shape having a locking piece portion 20d at the distal end portion 20c are arranged so as to face each other, and are opposite to the locking piece portion 20d of the pair of locking portions 20e. The sides are connected by a connecting portion 20f. The female joint 20 is formed with a fitting space 6 having a T-shaped cross section surrounded by the inner surfaces of the pair of locking portions 20e and the connecting portion 20f.

  Further, the female joint 20 has a fitting hole 22 in the fitting portion 6 f that is open to the bottom surface 20 g facing the front end 20 c side of the fitting space 6 and is recessed from the bottom surface 20 g toward the outer surface. Two are formed at predetermined intervals in the extending direction, that is, in the direction of the axis O2 of the female joint 20. Further, the connecting portion 20f is provided with a substantially rectangular plate-like extending portion 20h extending outward from the outer surface at the approximate center of the extending direction O2, and the extending portion 20h has an extending direction O2. Through holes 20 i are formed on both sides of the center of the female joint 20 perpendicular to each other across the center. In addition, this extension part 20h and the through-hole 20i are for ensuring the joining strength of the female joint 20 and the concrete 1b of the segment 1. FIG.

  Further, in the present embodiment, of the pair of female joints 20, the front female joint 20 a shown in FIGS. 2 to 4 has an accommodation space communicating with the fitting space 6 at one side end 20 j. And a backup member 20k formed so as to close one side end portion 20j of the fitting space 6 is provided. Thus, the leading female joint 20a is formed so that the fitting space 6 is opened only on the other side end 20m side of the both side ends 20j, 20m. Further, the fitting-side female joint 20b shown in FIGS. 5 to 7 is provided with a closing portion 20n that closes the fitting space 6 at one side end portion 20j. The fitting space 6 is formed so as to open only on the other side end 20m side of the ends 20j, 20m.

  Then, as shown in FIG. 1, the female joint 20 formed as described above has a distal end portion 20c disposed on the joining end face 1a side of the segment 1, and a fitting space 6 is opened to the joining end face 1a. It is embedded in 1b. At this time, in this embodiment, the front female fitting 20a and the fitting female joint 20b installed in the same segment 1 incline the respective axes O2 with respect to the joining end face 1b and each other. The axis O2 is provided obliquely so as to intersect within the segment 1. This is because, when the flange portion 21a of the male joint 21 having a tapered surface, which will be described in detail later, is fitted in the fitting space 6, each of the pair of female joints 20 facing each other in the adjacent segment 1 and the male joint 20 are provided. This is a configuration for firmly connecting the mold joint 21. Furthermore, in the present embodiment, the female joint 20 is connected to a predetermined position in the concrete 1, that is, the locking piece 20d, with a gap provided between the tip 20c of the female joint 20 and the joining end face 1a. The distance d2 from the surface 20p facing the portion 20f side to the joint end surface 1a is embedded with high precision so as to have a predetermined dimension.

  Further, in the segment 1 in which the female joint 20 is embedded in this manner, an insertion port 24 for inserting the male joint 21 is formed near the other side end 20m side of the female joint 20, The insertion port 24 and the fitting space 6 communicate with each other on the other side end 20m side.

  On the other hand, as shown in FIGS. 8 to 10, the male joint 21 is formed in a substantially H-shaped cross section by connecting a pair of flange portions 21a parallel to each other by a connecting portion 21b. Further, the inner surfaces of the pair of flange portions 20a facing each other are formed in a tapered shape that is inclined so as to gradually approach from the one side end 21c toward the other side end 21d.

  When the adjacent segments 1 are joined to each other, as shown in FIG. 1, one flange portion 21 a of the male joint 21 is inserted into the insertion port 24, and the female joint 20 of one segment 1 is inserted. The fitting space 6 is fitted from the side end 20m side. In the present embodiment, at this time, the male joint 21 in a state fitted to only one segment 1 is from the surface 20p where the female joint 20 faces the connecting portion 20f side of the locking piece 20d to the joining end surface 1a. Since the distance d2 is embedded with high precision so as to have a predetermined dimension, a predetermined predetermined dimension projects from the joint end surface 1a of one segment 1 to the outside with high precision. Next, the other flange portion 21a of the male joint 21 of the portion protruding outward from the joint end face 1a of one segment 1 is inserted into the insertion port 24 of the other segment 1, and the tunnel shown in FIG. It is moved in the direction of the axis O1 and fitted from the side end portion 20m side of the female joint 20 of the other segment 1. Accordingly, both the female joints 20 are connected via the male joint 21 and the adjacent segments 1 are joined to each other. At this time, since the female joint 20 and the male joint 21 are connected in a state where the male joint 21 protrudes outward from the joining end face 1a of one segment 1 with high accuracy, the segments 1 are surely placed at predetermined positions. Arranged and joined.

  Next, a method for manufacturing the segment 1 having the above-described configuration will be described, and operations and effects of the method for manufacturing the segment 1 of the present embodiment will be described.

  First, when the female joint 20 is fixedly installed at a predetermined position in a mold for placing the concrete 1b of the segment 1, in this embodiment, for example, a T-shaped jig 30 formed with high-precision dimensions by machining. Is used. As shown in FIGS. 11 to 13, the T-shaped jig 30 is formed in a T-shape in a side view by connecting a head portion 30 a and a shaft portion 30 b that are formed in a substantially rectangular flat plate shape so as to be orthogonal to each other. Has been. The head portion 30a is formed to have a length that connects both side end portions 20j and 20m of the female joint 20, that is, a length that is substantially equal to the length in the extending direction O2 of the fitting space 6. Further, the head portion 30a is formed with a screw hole 30h penetrating from the one surface (outer surface) 30f to which the one end 30e of the shaft portion 30b is connected to the other surface 30g, on both sides 30c and 30d in the longitudinal direction. On the other hand, the shaft portion 30b is formed with a width and length smaller than the head portion 30a, and is formed at a substantially central portion in the width direction of the head portion 30a and a pair of screw holes 30h provided on both side ends 30c and 30d in the length direction. One end 30e is connected to one surface 30f of the space and protrudes. Thereby, the T-shaped jig 30 of the present embodiment is formed so as to exhibit a T shape in front view as well as in side view. The shaft portion 30b is formed so as to be inclined so that the other end (the end portion of the T-shaped jig 30) 30i gradually approaches the one surface 30f of the head portion 30a as it goes from the one side end 30c side to the other side end 30d side. Has been. The inclination angle of the other end 30i of the shaft portion 30b is equal to the inclination angle of the axis O2 of the female joint 20 installed in the segment 1 and the joining end face 1a of the segment 1 as shown in FIG.

  And when manufacturing the segment 1 using said T-shaped jig | tool 30, first, the formwork 31 is assembled so that the circular disk-shaped inner space may be formed. As shown in FIG. 14, the mold 31 is formed such that a portion of the end plate 31 a forming the joining end surface 1 a of the segment 1 has a planar inner surface (inner surface of the mold 31) 31 b. A plurality of holes 31c are formed at predetermined positions of the end plate 31a.

  Next, when the female joint 20 is installed at a predetermined position in the mold 31, first, as shown in FIG. 14, the head 30 a is placed in the fitting space 6 of the female joint 20 and the connecting portion 30 f side. The shaft portion 30b is disposed on the distal end portion 20c side and engaged. Next, the female joint 20 in a state where the T-shaped jig 30 is engaged as described above is arranged so that the inner surface 31b of the mold 31 and the tip portion 20c face each other. Next, the bolt (screwing member) 32 is inserted into the hole 31c from the outside of the mold 31 with a spring washer 33 interposed between the head 32a of the bolt 32 and the mold 31 and fitted. A male screw portion of a bolt 32 is inserted into a screw hole 30h formed in the head portion 30a of the T-shaped jig 30 through a portion of the space 6 where the shaft portion 30b of the T-shaped jig 30 is not engaged with the tip portion 20c. 32b is screwed.

  Then, the bolt 32 is further screwed in, and the male screw portion 32b is penetrated from the head portion 30a of the T-shaped jig 30, and the tip 32c is formed in the connecting portion 20f of the female joint 20 as shown in FIG. The fitting hole 22 is fitted. Thus, the bolts 32 are respectively screwed into the pair of screw holes 30h formed in the head 30a of the T-shaped jig 30, and the tips 32c of the bolts 32 are fitted into the pair of fitting holes 22 of the female joint 20, respectively. By doing so, the female joint 20 is positioned in the direction along the inner surface 31 b of the mold 31, that is, in the direction along the joining end surface 1 a of the segment 1.

  Next, when the bolt 32 is further screwed in, as shown in FIG. 16, the tip 32c of the bolt 32 comes into contact with the bottom surface 22a of the fitting hole 22 (bottom surface of the fitting space 6). The female joint 20 (the bottom surface 22a of the fitting hole 22) 20 is pressed to move the female joint 20 away from the inner surface 31b of the mold 31. At the same time, the T-shaped jig 30 to which the bolt 32 is screwed approaches the inner surface 31b of the mold 31 while projecting the end portion (the other end 30i) of the shaft portion 30b from the tip portion 20c of the female joint 20 to the outside. To move. When the end portion 30i of the T-shaped jig 30 protruding outward from the distal end portion 20c of the female joint 20 contacts the inner surface 31b of the mold 31, the movement of the T-shaped jig 30 is stopped. Positioning is done. At the same time, the locking piece portion of the female joint 20 is formed on one surface 30f of the head 30a of the positioned T-shaped jig 30, that is, on the outer surface facing the mold 31 side of the head 30a of the T-shaped jig 30. A surface 20p of 20d facing the connecting portion 20f side (an inner surface forming the fitting space 6) 20p comes into contact with and closely contacts, and the female joint 20 is locked. As a result, the female joint 20 is positioned at a predetermined position in the mold 31.

  At this time, the length of the bolt 32 is formed with high accuracy, and the length of the shaft portion 30b of the T-shaped jig 30 is formed with high accuracy, so that the female stopped and stopped as described above. The mold joint 20 has a distance d2 from the surface 20p facing the connecting portion 20f side of the locking piece 20d of the female joint 20 to the inner surface 31b of the mold frame 31, that is, the joining end surface 1 a of the segment 1. It is determined by the length of the shaft portion 30b, and the length dimension of the shaft portion 30b is accurately formed, so that the shaft portion 30b is reliably arranged at a predetermined position. Therefore, the female joint 20 is suitably fitted with the male joint 21 and is installed at a predetermined position in the mold 31 that can suitably join the segments 1 to each other.

  Further, in this state, the shaft portion 30b of the T-shaped jig 30 is located between the distal end portion 20c of the locking portion 20e of the female joint 20 and the inner surface (joint end surface 1a of the segment 1) 31b of the mold 31. Since it protrudes outside from the front-end | tip part 20c of the female coupling 20, the clearance gap H is inevitably formed. For this reason, the distance d1 from the inner surface 20p of the female joint 20 that contacts the outer surface of the T-shaped jig 30 and locks the female joint 20 to the tip 20c, that is, the thickness d1 dimension of the locking piece 20d. Even in a different case, the distance d2 from the inner surface 20p of the female joint 20 that reliably contacts the outer surface of the T-shaped jig 30 and engages the female joint 20 to the joining end surface 1a of the segment 1 is ensured with high accuracy. The female joint 20 is installed. Therefore, unlike the conventional segment manufacturing method, it is not necessary to cut the tip 20c of the female joint 20 by machining, and a plurality of female joints in which the thickness d1 of the locking piece 20d has variations are produced. 20 can be installed with high accuracy using the same T-shaped jig 30. The gap H is obtained by attaching an O-ring or a sheet-like elastic member in advance to the inner surface 31b of the mold 31 (the inner surface 31b of the end plate 31a) or the distal end portion 20c of the female joint 20, for example. You may comprise so that it may obstruct | occlude.

  Furthermore, since the female joint 20 is accurately installed by using the T-shaped jig 30 having the screw holes 30h and the bolts (screwing members) 32, the frame is formed as in the conventional segment manufacturing method. It is not necessary to form a screw hole in the female joint 20 for installation at a predetermined position in 31. In this embodiment, it is necessary to form the fitting hole 22 for fitting the tip 32c of the bolt 32 in the female joint 20. However, since the fitting hole 22 is not a screw hole, it is a cast female die. A convex portion corresponding to the fitting hole 22 may be formed at the time of manufacturing a mold for forming the joint 20, and it is necessary to form the fitting hole 22 for a large number of female joints 20 by machining. Absent.

In the present embodiment, as described above, the end of the T-shaped jig 30 (the other end of the shaft portion 30b) 30i is brought into contact with the inner surface 31b of the mold 31 to install the female joint 20 at a predetermined position. In this case, the other end 30i of the shaft portion 30b has an inclination angle equivalent to the inclination angle of the axis O2 of the female joint 20 installed in the segment 1 and the joining end face 1a of the segment 1 as shown in FIG. Is formed. For this reason, as shown in FIG. 17, when the two bolts 32 are respectively fitted into the two fitting holes 22 of the female joint 20 and screwed, the other end 30 i of the shaft portion 30 b is connected to the mold 31. The bolt 32 is fastened while the axis thereof is inclined obliquely, and the female joint 20 automatically connects the axis O2 to the joining end face 1a of the segment 1. It is installed so as to intersect at a predetermined inclination angle. Therefore, by forming the end 31i of the T-shaped jig 30 at a predetermined inclination angle in advance, the female joint 20 can be reliably installed at a desired angle.

  And in order to form the insertion port 24 which inserts the male type joint 21 in the side edge part 20m side of the female type joint 20 in the step which installed the female type joint 20 as mentioned above, as shown in FIG. A punching die 34 having a substantially rectangular cross section, for example, is installed near the female joint 20. The punching die 34 includes a screw hole 34a into which a bolt 35 inserted from the outside of the mold 31 into the hole 31c is screwed. By screwing the bolt 35 and the screw hole 34a, the inside of the mold 31 is provided. Fixed in place. Further, along with the screwing of the bolt 35, one surface 34 b facing the same direction as the joining end surface 1 a of the segment 1 is brought into close contact with the inner surface 31 b of the mold 31. Furthermore, at this time, by forming the hole portion 31c at an appropriate position, the bolt 35 is screwed into the screw hole 34a, and one side surface of the punching die 34 is the other side end portion 20m of the female joint 20. It is installed in close contact with.

  When the female joint 20 and the punching die 34 are installed, reinforcing bars are placed in the mold 31 and the concrete 1b is placed. When the concrete 1b is hardened, the female joint 20 and the punching die 34 are fixed. The bolts 32 and 35 are removed and the mold 31 is removed. Then, the die 34 is removed from the concrete 1b to open the insertion port 24, and the T-shaped jig 30 engaged with the fitting space 6 is pulled out from the side end 20m side of the female joint 20 to the insertion port 24. remove. Thus, since the T-shaped jig 30 can be recovered from the fitting space 6 of the female joint 20 at the stage where the mold 31 is removed, it can be reused every time the segment 1 is manufactured.

  Therefore, in the segment manufacturing method of the present embodiment, the female joint 20 is accurately placed at a predetermined position by forming the dimensions of the T-shaped jig 30 and the screwing member (bolt) 32 with high accuracy. can do. In addition, even when the thickness d1 of the locking piece 20d of the female joint 20 is different, the formwork is surely formed from the inner surface 20p of the female joint 20 by which the female joint 20 is locked by the T-shaped jig 30. It is possible to install the female joint 20 while ensuring the distance to the inner surface 31b (joint end surface 1a of the segment 1) 31 with high accuracy. Further, the female joint 20 can be accurately installed by the T-shaped jig 30 having the screw hole 30h and the screwing member 32, and the T-shaped jig 30 is reused every time the segment 1 is manufactured. be able to. Therefore, unlike the conventional segment manufacturing method, it is not necessary to cut the distal end portion 20c of the female joint 20 by machining, and a screw hole for installation at a predetermined position in the mold 31 is provided. Therefore, it is possible to reduce the manufacturing cost of the female joint 20 and thus the segment 1.

  Further, even when the female joint 20 is installed to be inclined with respect to the joining end surface 1a of the segment 1 as in the present embodiment, the T-shaped jig 30 in which the end 30i is formed at a predetermined inclination angle. By using the female joint 20, it is possible to easily and reliably install the female joint 20 at a desired inclination angle.

  Further, by forming a fitting hole 22 into which the tip 32c of the screwing member 32 is fitted in the female joint 20, the female joint 20 is positioned with respect to the extending direction of the joining end face 1a of the segment 1. It becomes possible.

  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 this embodiment, it is assumed that the female joint 20 is provided so that the axis O2 is obliquely arranged with respect to the joining end surface 1a of the segment 1, and in order to install the female joint 20 in this way, the T-type The end 30i of the jig 30 is formed so as to be inclined. However, when the female joint 20 is installed in parallel to the joining end surface 1a of the segment 1, a predetermined inclination angle is formed on the inner surface 31b of the mold 31. In the case where the inclined surface having the shape is formed in advance, it is not necessary to form the end portion 30i of the T-shaped jig 30 in an inclined manner.

  Further, in the present embodiment, the T-shaped jig 30 has a shaft portion 30b having a width and length smaller than the head portion 30a, substantially in the center in the width direction of the head portion 30a, and both longitudinal ends 30c, It is assumed that one end 30e is connected to one surface 30f between a pair of screw holes 30h provided on the 30d side, and is formed so as to exhibit a T shape in front view as well as in side view. However, in the T-shaped jig 30, for example, as shown in FIGS. 18 to 20, the shaft portion 30b is protruded from the both sides 30c and 30d in the longitudinal direction of the head 30a with one end 30e connected to one surface 30f. The screw hole 30h is formed so as to pass through the head 30a and the shaft 30b from the other surface 30g of the head 30a and open to the end 30i of the shaft 30b, and has a T shape in a side view. It may be formed so as to present a U shape visually.Also in this case, the respective shaft portions 30b that are arranged on the distal end portion 20c side of the fitting space 6 and engage with the female joint 20 screw the screwing members 32 into the respective screw holes 30h, and end portions It is possible to place the female joint 20 in a predetermined position by bringing 30i into contact with the inner surface 31b of the mold 31. Similarly to the present embodiment, when the female joint 20 is installed to be inclined with respect to the joining end surface 1a of the segment 1, the end 30i of each shaft portion 30b may be formed to be inclined.

  Furthermore, although the two screw holes 30h are formed in the T-shaped jig 30, it is not necessary to limit the number of the screw holes 30h in particular.

It is sectional drawing which shows the joint structure which consists of a male type joint and a female type joint which join segments. It is a front view which shows a leading side female joint. FIG. 3 is a view taken along line X1-X1 in FIG. FIG. 3 is a view taken along line X2-X2 in FIG. 2. It is a front view which shows a fitting side female joint. FIG. 6 is a view taken along line X1-X1 in FIG. 5. FIG. 6 is a view taken along line X2-X2 in FIG. 5. It is a front view which shows a male type | mold joint. It is a X1-X1 line arrow directional view of FIG. FIG. 9 is a view taken along line X2-X2 in FIG. It is a front view which shows the T-shaped jig | tool used for the manufacturing method of the segment which concerns on one Embodiment of this invention. It is a X1-X1 line arrow directional view of FIG. It is the X2-X2 line arrow directional view of FIG. In the manufacturing method of the segment concerning one embodiment of the present invention, it is a side view showing the state where the female joint with which the T type jig was engaged was arranged opposite to the formwork. In the manufacturing method of the segment which concerns on one Embodiment of this invention, the side surface which shows the state which screwed the screwing member to the internal thread part of the T-shaped jig | tool, and fitted the front-end | tip of the screwing member to the fitting hole. FIG. In the method for manufacturing a segment according to one embodiment of the present invention, the tip of the T-shaped jig is brought into contact with the inner surface of the mold, and the outer surface of the T-shaped jig is brought into contact with the inner surface of the female joint. It is a side view which shows the state which installed the female type | mold joint in the predetermined position. In the method for manufacturing a segment according to one embodiment of the present invention, the tip of the T-shaped jig is brought into contact with the inner surface of the mold, and the outer surface of the T-shaped jig is brought into contact with the inner surface of the female joint. It is a figure which shows the state which installed the punching die while installing a female type | mold joint in a predetermined position. It is a front view which shows the modification of the T-shaped jig | tool used for the manufacturing method of the segment which concerns on one Embodiment of this invention. It is a X1-X1 line arrow directional view of FIG. It is the X2-X2 line arrow directional view of FIG. It is a perspective view which shows the state which installed the segment in the tunnel. It is a sectional side view which shows the joint structure which joins the segments manufactured using the manufacturing method of the conventional segment. In the conventional manufacturing method of a segment, it is a figure which shows the state which installed the female type | mold joint in the formwork. It is a side view which shows the joint structure which joins the segments manufactured using this.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Segment 1a Joining end surface 2 Segment ring body 3 Inter-ring joint 4 Inter-segment joint 6 Fitting space 20 Female joint 20a Tip side female joint 20b Fitting side female joint 20c Tip part 20d Locking piece part 20e Locking part 20f Connecting portion 20g Inner surface (bottom surface)
20j Side end portion 20m Side end portion 20p A surface (inner surface) facing the connecting portion side of the locking piece portion
21 male joint 21a flange portion 21b connecting portion 22 fitting hole 22a bottom surface 24 of fitting hole insertion port 30 T-shaped jig 30a head portion 30b shaft portion 30f one surface (outer surface)
30g Other surface 30h Screw hole 30i End 32 Bolt (screwing member)
32a Head 32b Male thread portion 32c Tip 33 Spring washer 34 Die die d1 Locking piece thickness d2 Distance from the surface facing the connecting portion of the locking piece to the inner surface of the mold frame H Clearance O1 Tunnel axis O2 Female joint axis

Claims (2)

Method of manufacturing a segment comprising a female joint in which a T-shaped fitting space into which a male joint for joining adjacent segments is fitted is opened at the joining end face of the segment and is embedded in concrete Because
In a state where a T-shaped T-shaped jig is engaged with the fitting space, the female joint is disposed with the tip end portion of the fitting space facing the inner surface of the mold,
A screwing member is inserted from the outside of the mold into the hole of the mold and the fitting space, and screwed into a screw hole formed in the T-shaped jig,
By further screwing of the screwing member, the bottom of the fitting space is pressed with the tip of the screwing member inserted through the T-shaped jig, and the female joint is moved away from the inner surface of the formwork. And moving the T-shaped jig closer to the inner surface of the mold,
The T-shaped jig is positioned by bringing the end of the T-shaped jig protruding outward from the tip of the female joint into contact with the inner surface of the mold, and the positioned T An inner surface forming the fitting space is brought into contact with an outer surface of a mold jig to lock the female joint, thereby positioning the female joint at a predetermined position in the mold frame. The manufacturing method of the segment. In the manufacturing method of the segment of Claim 1,
The female joint is formed with a fitting hole in which an end of the screwing member is fitted on an inner surface forming the fitting space.

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