JP2007154568A - Joint structure of segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve cut-off performance between segments by reducing a maximum aperture between the segments without reducing the pitches of locking parts of an insertion member and locked parts of an inserted member. <P>SOLUTION: In this joint structure of the segments, a joint end face 1b of one segment is protrusively provided with the insertion member 5, and a joint end face 1b of the other segment is provided with the inserted member 4. A plurality of locking parts 8 of rugged shape extending in a circumferential direction are formed at constant pitches in an axial direction on the outer peripheral surface of the insertion member 5, and a plurality of locked parts 12 of rugged shape extending in the circumferential direction are formed in the axial direction on the inner peripheral surface of the inserted member 4. The insertion member 5 is inserted in the inserted member 4, and the locking parts 8 are engaged with the locked parts 12 to fit and lock the insertion member 5 to the inserted member 4, thus joining the adjacent segments to each other. In this case, the plurality of locked parts 12 are formed, in at least one part, at spaces (P/2) of different dimension from a value integer times as large as the pitch P of the locking parts 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a joint structure of segments that join adjacent segments together.

  Conventionally, as a ring-to-ring joint structure between segments adjacent to each other in the tunnel axis direction, a pin bolt-like insertion member provided on the inter-ring joint surface of one segment is formed into a cylindrical shape provided on the inter-ring joint surface of the other segment. There is a joint structure that is configured to be inserted into the inserted member. The insertion member is a pin bolt-like member, and sawtooth-shaped locking portions extending in the circumferential direction are continuously formed on the outer peripheral surface of the insertion member at a constant pitch in the axial direction. The member to be inserted has a configuration in which a plurality of annular washers (snap rings) are stacked, and the inner peripheral surface of the member to be inserted has a sawtooth-like locked portion (fitting to the locking portion) ( The inner peripheral portion of the washer is continuously formed in the axial direction at a pitch corresponding to the pitch of the locking portion (see, for example, Patent Document 1).

In the joint structure described above, when the insertion member is inserted into the member to be inserted, the insertion member is intermittently inserted at intervals corresponding to the pitch of the locking portion and the locked portion. For example, when an insertion member in which locking portions (saws) are formed at a pitch of 2 mm is inserted into a member to be inserted having a structure in which washers having a thickness of 2 mm are stacked, the insertion member is intermittently 2 mm at a time. It is inserted and locked to the member to be inserted.
JP 2004-108519 A

  However, in the above-described conventional joint structure, the insertion member is intermittently inserted and locked at an interval corresponding to the pitch of the locking portion and the locked portion, so that the opening between the segments becomes too large. There is a problem that there is. Specifically, when the pitch of the locking portion and the locked portion is 2 mm, the opening between the segments is 2 mm at the maximum. Usually, in order to ensure the water-stopping between the segments, it is necessary to make the opening between the segments 1.5 mm or less. Therefore, if the opening of 2 mm occurs, the water-stopping between the segments cannot be secured. On the other hand, by reducing the pitch of the locking part and the locked part, the maximum opening between the segments can be reduced, but there is a limit to reducing the pitch of the locking part and the locked part. is there. Specifically, when the pitch of the locking portion and the locked portion is 1.5 mm or less, the maximum opening between the segments is 1.5 mm or less, but the locking portion and the locked portion are sheared and broken. It becomes easy, and there exists a possibility that the fitting locking state of an insertion member and a member to be inserted cannot be maintained appropriately.

  In the present invention, the above-described conventional problems are taken into consideration, and the maximum opening between the segments is reduced without reducing the pitch of the locking portion and the locked portion, thereby improving the water stoppage between the segments. It aims at providing the joint structure of the segment which can be made to be able to be made.

  According to the first aspect of the present invention, of the adjacent segments, an insertion member protrudes from the joining end face of one segment, and the cylindrical covering member into which the insertion member is inserted is joined to the joining end face of the other segment. An insertion member is provided, and on the outer peripheral surface of the insertion member, a plurality of concave and convex engaging portions extending in the circumferential direction are formed at a constant pitch in the axial direction, and on the inner peripheral surface of the inserted member, A plurality of concave and convex locked portions extending in the circumferential direction are formed in the axial direction, the insertion member is inserted into the inserted member, and the locking portion is engaged with the locked portion. Thus, in the joint structure of a segment in which the insertion member is fitted and locked to the member to be inserted and adjacent segments are jointed, the plurality of locked portions are at least one of the locking portions. Formed at intervals of different dimensions from the integral multiple of the pitch of the part It is characterized in that it is.

  Due to such a feature, the locked portions are respectively disposed on both sides across a portion where a gap having a dimension different from a value obtained by multiplying the pitch of the locking portions by an integer is provided. For example, when a plurality of locked portions are formed at a predetermined interval in one place, among the locked portion groups on both sides, the locking portion of the insertion member is in the locked portion group on one side. When engaged and the insertion member is locked, the locking portion of the insertion member and the locked portion group on the other side are not meshed. When the insertion member is moved back and forth in the axial direction, the locking portion of the insertion member is engaged with the other-side locked portion group before being engaged again with the one-side locked portion group. In this way, the interval between the insertion members that are intermittently inserted is smaller than the pitch of the locking portions.

  According to a second aspect of the present invention, in the joint structure of the segment according to the first aspect, the inserted member has a plurality of snap rings whose inner peripheral portions are the locked portions, and a pitch of the locking portions. An interposition member having a thickness different from an integer multiple and a thickness dimension different from each other, wherein the plurality of snap rings are stacked, and the interposition member is interposed in at least one of the adjacent snap rings. It is characterized by being.

  Due to such a feature, only by interposing the interposition member at least at one place between the snap rings, the plurality of locked portions are different from the value obtained by multiplying the pitch of the locking portion by an integral number at at least one location. It is formed with an interval of.

  According to a third aspect of the present invention, in the joint structure of the segment according to the first or second aspect, a plurality of intervening members interposed between the snapped portions or between the snap rings are provided. The locking portion and the locked portion are formed at the same pitch, and the dimension of the plurality of intervals of the locked portion or the thickness dimension of the plurality of interposition members is expressed by the following equations, respectively. And different or identical values.

  With such a feature, for example, when a plurality of interposition members having a predetermined thickness are interposed at a plurality of locations, a plurality of locked portions are formed at a plurality of locations at predetermined intervals, and are divided into a plurality of portions. When the locking portion of the insertion member is engaged with one locked portion group among the plurality of locked portion groups that are divided, the locking portion of the insertion member and others The plurality of locked portion groups are not engaged with each other. When the insertion member is advanced and retracted in the axial direction, the locking portion of the insertion member is engaged with any of the other locked portion groups, and when the insertion member is further advanced and retracted in the axial direction, the other engaged portions are sequentially engaged. It is meshed with the stop group.

  According to a fourth aspect of the present invention, in the segment joint structure according to the first or second aspect, the interval formed between the locked portions or the interposition member interposed between the snap rings is adjacent to each other. It is provided between the locked parts, respectively, and the locking part and the locked part are formed at different pitches.

  With such a feature, the insertion member is intermittently fitted and locked to the inserted member at an interval corresponding to the difference between the pitch of the locking portion and the pitch of the locked portion.

  According to the joint structure of the segment according to the present invention, the interval between the insertion members intermittently fitted and locked is smaller than the pitch of the locking portion, so the pitch of the locking portion and the locked portion is reduced. Without doing so, the maximum opening between the segments can be reduced, and the water stoppage between the segments can be improved.

  Further, the inserted member includes a plurality of snap rings whose inner peripheral portions are the locked portions, and intervening members having thicknesses different from a value obtained by multiplying the pitch of the locking portions by an integral number. The ring is laminated in the axial direction, and an interposition member is interposed at at least one location between adjacent snap rings. As a result, only by interposing the interposition member in at least one place between the snap rings, the plurality of locked portions have an interval having a dimension different from the value obtained by multiplying the pitch of the locking portions by an integer. Since it is formed open, the inserted member can be easily manufactured, and the dimension of the interval between the locked portions can be adjusted only by adjusting the thickness of the interposed member.

  Hereinafter, first, second, and third embodiments of a joint structure for a segment according to the present invention will be described with reference to the drawings. In the following description, “front” and “front” are “front” and “front” in the direction of tunnel 2 tunneling, and are the left side in FIG. 1. Further, “rear” and “rear side” are “rear” and “rear side” in the tunnel 2 digging direction, and are the right side in FIG.

[First Embodiment]
First, a first embodiment of a joint structure for a segment according to the present invention will be described.
FIG. 1 shows a tunnel 2 composed of a plurality of segment pieces 1 (segment). As shown in FIG. 1, a tunnel 2 is constructed by assembling a plurality of curved plate-like segment pieces 1 into a cylindrical shape. At this time, the segment pieces 1 and 1 adjacent to each other in the circumferential direction of the tunnel 2 have inter-piece joint joints between which the opposing inter-piece joining end faces 1a and 1a (end faces of the segment piece 1 extending in the tunnel 2 axial direction) are not shown It is connected by joining via. Further, the segment pieces 1, 1 adjacent to each other in the axial direction of the tunnel 2 have a plurality of opposing inter-ring joint end faces 1b, 1b (end faces of the segment piece 1 extending in the circumferential direction of the tunnel 2) (4 in FIG. 1). Are connected by being joined via joints 3 between rings 3 (joint structure).

  FIG. 2 is an enlarged cross-sectional view showing a configuration of the inter-ring joint 3 in the first embodiment. As shown in FIGS. 1 and 2, the inter-ring joint 3 includes a cylindrical inserted member 4 embedded in the inter-ring joining end surface 1 b (joining end surface) on the front side of the segment piece 1 previously installed, A pin-shaped insertion member 5 projecting from the ring-to-ring joining end surface 1b on the rear side of the segment piece 1 to be installed in the insertion member 5 is inserted into the inserted member 4, Adjacent segment pieces 1, 1 are joined together.

  FIG. 3 is a cross-sectional view of the inter-ring joint 3 showing a state in which the member to be inserted 4 and the insertion member 5 are joined in the first embodiment. As shown in FIGS. 2 and 3, the insertion member 5 is composed of an anchor portion 6 fixed in the concrete of the segment piece 1 and a pin bolt portion 7 protruding vertically from the inter-ring joining end surface 1 b. Yes. On the outer peripheral surface of the pin bolt portion 7, a plurality of concave and convex engaging portions 8... Extending in the circumferential direction are formed on the outer peripheral surface of the pin bolt portion 7 at a constant pitch P in the axial direction. The outer peripheral surface of each has a sawtooth shape in which locking portions 8 having a right-angled triangular cross-section are continuously formed. Further, the tip end of the pin bolt portion 7 has a shape that is tapered toward the tip, so that the pin bolt portion 7 can be easily inserted into the inserted member 4.

  The inserted member 4 includes a case 9 embedded in the concrete of the segment piece 1, a plurality of snap rings 10... Held in the case 9, and an interposed member 11 interposed between the snap rings 10, 10. It is composed of

  The case 9 is a bottomed cylindrical container with the inter-ring joining end surface 1b side (the distal end side of the inserted member 4) opened and the proximal end side of the inserted member 4 closed, and the inner peripheral surface on the distal end side Is formed with a recess 9a extending in the circumferential direction.

  The snap rings 10 are annular plate members having a thickness corresponding to the pitch P of the locking portions 8 formed on the insertion member 5, and are held in the recess 9a of the case 9 in a stacked state. ing. The inner peripheral part of each snap ring 10 has a cross-sectional shape of a right triangle, and is a concave and convex locked part 12 engaged and locked with the locking part 8 of the insertion member 5. Each of the locked portions 12 is formed so as to project inward from the inner peripheral surface of the case 9 and extend in the circumferential direction. Moreover, the to-be-latched part 12 ... is continuously formed in the axial direction, and is formed by the same pitch P as the latching | locking part 8 ....

  Further, the interposition member 11 is an annular plate member having a thickness that is different from a value obtained by multiplying the pitch P of the locking portions 8... By an integral multiple. This is a member having a thickness (P / 2) corresponding to / 2). The interposition member 11 is disposed at the middle position of the stacked snap rings 10..., And a plurality of (four in the present embodiment) the snap rings 10. First snap ring group 13 on the distal end side (open end side) composed of a plurality of snap rings 10 and a proximal end side (closed side) composed of a plurality of (four in this embodiment) snap rings 10. It is divided into a second snap ring group 14. The plurality of locked portions 12 held in the case 9 by the interposition member 11 are spaced apart from each other by a dimension different from an integer multiple of the pitch P of the locking portions 8. In the middle position of the stacked snap rings 10..., An interval (P / 2) corresponding to 1/2 of the pitch P of the locking portions 8.

  Next, the behavior of the inter-ring joint 3 when the insertion piece 5 is inserted into the inserted member 4 and the adjacent segment pieces 1 and 1 are joined together will be described.

  4 to 7 are partial cross-sectional views showing a process of inserting the insertion member 5 in the first embodiment into the member 4 to be inserted. As shown in FIGS. 4 to 7, when the insertion member 5 is inserted into the inserted member 4, the locking portions 8 of the insertion member 5 are locked with the locked portions 12 a of the first snap ring group 13. The second snap ring group 14 is alternately engaged with the locked portions 12b.

  For example, as shown in FIG. 4, the insertion member 5 is inserted into the inserted member 4, and the locking portion 8 of the insertion member 5 is locked to the first snap ring group 13 of the inserted member 4. When engaged with the portions 12a, the engaged portions 12b of the second snap ring group 14 are not engaged with the engaging portions 8 of the insertion member 5. Further, the deviation between the reference line A of the insertion member 5 and the reference line B of the inserted member 4 is a deviation amount (3P / 2) corresponding to 3/2 of the pitch P of the locking portions 8.

  Thereafter, as shown in FIG. 5, when the insertion member 5 is further pushed into the inserted member 4 from the state shown in FIG. 4, the locking portions 8. Are engaged with the locked portions 12b of the second snap ring group 14 before being engaged again with 12a. At this time, the deviation between the reference line A of the insertion member 5 and the reference line B of the inserted member 4 is a deviation amount (P) corresponding to the pitch P of the locking portions 8.

  Subsequently, as shown in FIG. 6, when the insertion member 5 is further pushed into the inserted member 4 from the state shown in FIG. 5, the locking portions 8... Become the locked portions of the second snap ring group 14. .. Are engaged again with the locked portions 12 a of the first snap ring group 13. At this time, the deviation between the reference line A of the insertion member 5 and the reference line B of the inserted member 4 is a deviation amount (P / 2) corresponding to ½ of the pitch P of the locking portions 8. .

  Further, as shown in FIG. 7, when the insertion member 5 is further pushed into the inserted member 4 from the state shown in FIG. 6, the locking portions 8... Are locked by the locked portions 12 a of the first snap ring group 13. Are engaged again with the engaged portions 12b of the second snap ring group 14 before being engaged again. At this time, the reference line A of the insertion member 5 and the reference line B of the inserted member 4 coincide.

  Thereafter, when the insertion member 5 is further pushed into the inserted member 4, the locking portions 8 of the insertion member 5 are again engaged with the locked portions 12 a of the first snap ring group 13 of the inserted member 4. Will be. In this way, the insertion member 5 is inserted into the inserted member 4, and the engagement between the locking portions 8 ... and the locked portions 12a ..., 12b ... is repeated.

  As shown in FIG. 4 to FIG. 7, the engagement of the locking portions 8 and the locked portions 12a, 12b, and the like is repeated, and the reference line A of the insertion member 5 and the reference line of the insertion member 4 are repeated. The deviation from B gradually decreases step by step at an interval (P / 2) corresponding to 1/2 of the pitch P of the locking portions 8. As described above, when the insertion member 5 is inserted into the member to be inserted 4, the insertion member 5 is spaced at an interval smaller than the pitch P of the locking portions 8. The inserted member 4 is intermittently fitted and locked at an interval (P / 2) corresponding to 1/2.

  According to the inter-ring joint 3 having the above-described configuration, the interval between the insertion members 5 that are intermittently fitted and locked is smaller than the pitch P of the locking portions 8. 8 is intermittently fitted and locked at intervals of half (P / 2) of the pitch P, so that the segment pieces 1 and 1 can be formed without reducing the pitch of the locking portions 8 and the locked portions 12. The maximum opening X (shown in FIG. 3) between the inter-ring joining end faces 1b and 1b can be ½ of the pitch P (thickness) of the locking portions 8. Further, the water stoppage between the segment pieces 1 and 1 can be improved.

  Further, according to the inter-ring joint 3 having the above-described configuration, the intermediate snap ring 10 can be formed by simply interposing the interposition member 11 between the snap rings 10 and 10 at the middle position of the snap rings 10 to be laminated. At the middle position, a plurality of locked portions 12 are formed at intervals corresponding to half (P / 2) of the pitch P of the locking portions 8. Thus, the inserted member 4 can be easily manufactured, and the interval dimension of the locked portion 12 can be adjusted only by adjusting the thickness of the interposed member 11.

[Second Embodiment]
Next, a second embodiment of the joint structure for segments according to the present invention will be described. In addition, about the structure similar to 1st Embodiment mentioned above, the description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  8 to 11 are views of the inter-ring joint 103 according to the second embodiment, and are partial cross-sectional views showing a process of inserting the insertion member 5 into the member to be inserted 104. As shown in FIGS. 8 to 11, the inserted member 104 includes a plurality of snap rings 10 held in the case 9 shown in FIG. 2 and an interposed member 111 interposed between the snap rings 10 and 10. It is composed of ...

  A plurality of interposition members 111 are provided, which are a first interposition member 111a, a second interposition member 111b, and a third interposition member 111c from the distal end side of the inserted member 104, and each interposition member 111a, 111b. 111c are interposed between the snap rings 10 and 10, respectively. Each of the interposition members 111a, 111b, and 111c is an annular plate member having a thickness that is different from a value obtained by multiplying the pitch P of the engaging portions 8... By an integer. (Spacing dimension of the locked portions 12...) Is expressed by the following equations.

  In order to make the thickness dimension L of the interposition members 111... Different from the value obtained by multiplying the pitch P of the locking portions 8 by an integer, in the above formula, the integer n and the integer i are different integers (n ≠ i). In addition, the integer n and the integer i are combined so that the coefficient (i / n) of the pitch P does not become an integer.

  Moreover, the thickness dimension of each interposed member 111a, 111b, 111c is a mutually different value, and specifically, the 1st interposed member 111a is equivalent to 1/4 of the pitch P of the latching | locking part 8 .... The second interposed member 111b is a member having a thickness (P / 2) corresponding to ½ of the pitch P of the locking portions 8. The interposed member 111c is a member having a thickness (3P / 4) corresponding to 3/4 of the pitch P of the locking portions 8.

  The snap rings 10 are divided into a plurality of (four in the present embodiment) snap ring groups 113, 114, 115, and 116 with the interposition members 111a, 111b, and 111c interposed therebetween. Specifically, the first snap ring group 113 disposed in front of the first interposed member 111a (the distal end side of the inserted member 104), between the first interposed member 111a and the second interposed member 111b. The second snap ring group 114 disposed at the rear, the third snap ring group 115 disposed between the second interposed member 111b and the third interposed member 111c, and the rear side of the third interposed member 111c ( The fourth snap ring group 116 is arranged on the base end side of the inserted member 104. Each of the snap ring groups 113, 114, 115, 116 includes a plurality (two in this embodiment) of snap rings 10, 10.

  As described above, the first, second, third, and fourth interposed members 111a, 111b, and 111c are divided into first, second, third, and fourth snap ring groups 113, 114, 115, and 116. Thus, the plurality of locked portions 12 held in the case 9 are spaced at intervals of dimensions different from the values obtained by multiplying the pitch P of the locking portions 8 by an integer at each of the interposed members 111a, 111b, 111c. Open and formed. Specifically, the plurality of locked portions 12 are spaced at a position on the tip side of the stacked snap rings 10... (P / 4) corresponding to 1/4 of the pitch P of the locking portions 8. Further, an interval (P / 2) corresponding to 1/2 of the pitch P of the locking portions 8 is provided at the middle position of the stacked snap rings 10... And the stacked snap rings 10. Are formed at an interval (3P / 4) corresponding to 3/4 of the pitch P of the locking portions 8.

  Next, the behavior of the inter-ring joint 103 when the insertion member 5 is inserted into the member to be inserted 104 and the adjacent segment pieces 1 and 1 are joined together will be described.

  As shown in FIGS. 8 to 11, when the insertion member 5 is inserted into the inserted member 104, the locking portions 8 of the insertion member 5 are locked to the locked portions 12 c of the third snap ring group 115. The locked portion 12a of the snap ring group 113, the locked portion 12b of the second snap ring group 114, the locked portion 12d of the fourth snap ring group 116, and so on. The portions 12a, 12b, 12c, and 12d are repeatedly engaged with each other.

  For example, as shown in FIG. 8, the insertion member 5 is inserted into the inserted member 104, and the locking portion 8 of the insertion member 5 is locked by the third snap ring group 115 of the inserted member 104. When engaged with the portions 12c ..., the locked portions 12a ..., 12b ..., 12d ... of the first, second, and fourth snap ring groups 113, 114, 116 are the locking portions 8 of the insertion member 5. ... is not engaged. At this time, the deviation between the reference line A of the insertion member 5 and the reference line B of the inserted member 104 is a deviation amount (3P / 4) corresponding to 3/4 of the pitch P of the locking portions 8. .

  Thereafter, as shown in FIG. 9, when the insertion member 5 is further pushed into the inserted member 104 from the state shown in FIG. 8, the locking portions 8. Are engaged with the locked portions 12a. At this time, the locked portions 12b, ..., 12c, ..., 12d of the second, third, and fourth snap ring groups 114, 115, 116 are not engaged with the locking portions 8 of the insertion member 5. It has become. Further, the deviation between the reference line A of the insertion member 5 and the reference line B of the member 104 to be inserted is a deviation amount (P / 2) corresponding to 1/2 of the pitch P of the locking portions 8.

  Subsequently, as shown in FIG. 10, when the insertion member 5 is further pushed into the inserted member 104 from the state shown in FIG. 9, the locking portion 8. Are engaged with the locked portions 12b. At this time, the locked portions 12a ..., 12c ..., 12d ... of the first, third, and fourth snap ring groups 113, 115, 116 are not engaged with the locking portions 8 ... of the insertion member 5. It has become. Further, the deviation between the reference line A of the insertion member 5 and the reference line B of the inserted member 104 is a deviation amount (P / 4) corresponding to ¼ of the pitch P of the locking portions 8.

  Furthermore, as shown in FIG. 11, when the insertion member 5 is further pushed into the member to be inserted 104 from the state shown in FIG. 10, the locking portions 8... Of the fourth snap ring group 116 of the member to be inserted 104. It is meshed with the locked portions 12d. At this time, the locked portions 12a ..., 12b ..., 12c ... of the first, second, and third snap ring groups 113, 114, 115 are not engaged with the locking portions 8 ... of the insertion member 5. It has become. Further, the reference line A of the insertion member 5 and the reference line B of the inserted member 104 coincide with each other.

  Thereafter, when the insertion member 5 is further pushed into the inserted member 104, the locking portions 8 of the insertion member 5 are again engaged with the locked portions 12c of the third snap ring group 115 of the inserted member 104. .., 12b..., 12d... Of the first, second, and fourth snap ring groups 113, 114, 116 are not engaged with the locking portions 8 of the insertion member 5. It becomes a state. In this manner, the insertion member 5 is inserted into the inserted member 104, and the engagement of the locking portions 8 ... and the locked portions 12a ..., 12b ..., 12c ..., 12d ... is repeated.

12 shows the snap ring groups 113, 114, 115, and 116 constituting the locked portions 12 to be engaged with the locking portions 8 of the insertion member 5, and the insertion member 5 with respect to the reference line B of the inserted member 104. It is the table | surface which showed the relationship with the gap | deviation of the reference line A.
As shown in FIGS. 8 to 12, the engagement of the above-mentioned locking portions 8... And the locked portions 12 a..., 12 b. The deviation of the insertion member 104 from the reference line B changes at an interval (P / 4) corresponding to ¼ of the pitch P of the locking portions 8. As described above, when the insertion member 5 is inserted into the member to be inserted 104, the insertion member 5 has an interval smaller than the pitch P of the locking portions 8. The inserted member 104 is intermittently fitted and locked at an interval (P / 4) corresponding to 1/4.

  According to the inter-ring joint 103 having the above-described configuration, the interval between the insertion members 5 that are intermittently fitted and locked is smaller than the interval (P / 2) in the first embodiment. Are intermittently fitted and locked at intervals of 1/4 (P / 4) of the pitch P of the locking portions 8..., So that the pitch of the locking portions 8. In addition, the maximum opening between the inter-ring joining end faces 1b and 1b of the segment piece 1 and 1 can be set to 1/4 (P / 4) of the pitch P of the locking portion 8. The water stoppage between 1 can be further improved.

[Third Embodiment]
Next, a third embodiment of the joint structure for segments according to the present invention will be described. In addition, about the structure similar to 1st, 2nd embodiment mentioned above, the description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  FIGS. 13 to 16 are views of the inter-ring joint 203 according to the third embodiment, and are partial cross-sectional views showing a process of inserting the insertion member 5 into the member to be inserted 204. As shown in FIGS. 13 to 16, the inserted member 204 includes a plurality of snap rings 10 held in the case 9 shown in FIG. 2 and an interposed member 211 interposed between the snap rings 10, 10. It is composed of ...

  A plurality of interposition members 211 are provided, which are a first interposition member 211a, a second interposition member 211b, and a third interposition member 211c from the distal end side of the inserted member 204, and each interposition member 211a, 211b. , 211c are interposed between the snap rings 10 and 10, respectively. Each of the interposed members 211a, 211b, and 211c is an annular plate member having a thickness that is different from a value obtained by multiplying the pitch P of the locking portions 8 by an integer, and the thickness of each of the interposed members 211a, 211b, and 211c. The length dimension (the distance dimension between the locked portions 12) is expressed by the following equations.

The thickness dimension L of the interposing members 211 is different from the value obtained by multiplying the pitch P of the engaging portions 8 by an integer. Therefore, in the above equation, the integer n and the integer i are different integers (n ≠ i). In addition, the integer n and the integer i are combined so that the coefficient (i / n) of the pitch P does not become an integer.
Moreover, the thickness dimension of each interposition member 211a, 211b, 211c is mutually the same value, and thickness (P / 4) equivalent to 1/4 of the pitch P of the latching | locking part 8 ... in this Embodiment. )It has become.

  The snap rings 10 are divided into a plurality of (four in the present embodiment) snap ring groups 213, 214, 215, and 216 with the interposition members 211a, 211b, and 211c interposed therebetween. Specifically, a first snap ring group 213 disposed in front of the first interposed member 211a, and a second snap ring disposed between the first interposed member 211a and the second interposed member 211b. Group 214, a third snap ring group 215 disposed between the second interposed member 211b and the third interposed member 211c, and a fourth snap ring group disposed on the rear side of the third interposed member 211c. 216.

  Next, the behavior of the inter-ring joint 203 when the adjacent segment pieces 1 and 1 are jointed by inserting the insertion member 5 into the member to be inserted 204 will be described.

  As shown in FIGS. 13 to 16, when the insertion member 5 is inserted into the inserted member 104, the locking portions 8 of the insertion member 5 are locked to the locked portions 12 a of the first snap ring group 213. The locked portion 12b of the snap ring group 214, the locked portion 12c of the third snap ring group 215, the locked portion 12d of the fourth snap ring group 216, and so on. The portions 12a, 12b, 12c, and 12d are repeatedly engaged with each other.

  For example, as shown in FIG. 13, the insertion member 5 is inserted into the inserted member 204, and the locking portion 8 of the insertion member 5 is locked by the first snap ring group 213 of the inserted member 204. When engaged with the portions 12a ..., the locked portions 12b ..., 12c ..., 12d ... of the second, third, and fourth snap ring groups 214, 215, 216 are the locking portions 8 of the insertion member 5. ... is not engaged. At this time, the deviation between the reference line A of the insertion member 5 and the reference line B of the inserted member 204 is a deviation amount (3P / 4) corresponding to 3/4 of the pitch P of the locking portions 8. .

  Thereafter, as shown in FIG. 14, when the insertion member 5 is further pushed into the inserted member 204 from the state shown in FIG. 13, the locking portion 8. Are engaged with the locked portions 12b. At this time, the locked portions 12a ..., 12c ..., 12d ... of the first, third, and fourth snap ring groups 213, 215, 216 are not engaged with the locking portions 8 ... of the insertion member 5. It has become. Further, the deviation between the reference line A of the insertion member 5 and the reference line B of the inserted member 204 is a deviation amount (P / 2) corresponding to 1/2 of the pitch P of the locking portions 8.

  Subsequently, as shown in FIG. 15, when the insertion member 5 is further pushed into the inserted member 204 from the state shown in FIG. 14, the locking portions 8. Are engaged with the locked portions 12c. At this time, the locked portions 12a ..., 12b ..., 12d ... of the first, second, and fourth snap ring groups 213, 214, 216 are not engaged with the locking portions 8 ... of the insertion member 5. It has become. Further, the deviation between the reference line A of the insertion member 5 and the reference line B of the member to be inserted 204 is a deviation amount (P / 4) corresponding to ¼ of the pitch P of the engaging portions 8.

  Further, as shown in FIG. 16, when the insertion member 5 is further pushed into the inserted member 204 from the state shown in FIG. 15, the locking portions 8... Of the fourth snap ring group 216 of the inserted member 204. It is meshed with the locked portions 12d. At this time, the locked portions 12a ..., 12b ..., 12c ... of the first, second and third snap ring groups 213, 214, 215 are not engaged with the locking portions 8 ... of the insertion member 5. It has become. Further, the reference line A of the insertion member 5 and the reference line B of the member to be inserted 204 coincide with each other.

  Thereafter, when the insertion member 5 is further pushed into the inserted member 204, the locking portions 8 of the insertion member 5 are again engaged with the locked portions 12a of the first snap ring group 213 of the inserted member 204. .., 12c..., 12d... Of the second, third, and fourth snap ring groups 214, 215, 216 are not engaged with the locking portions 8 of the insertion member 5. It becomes a state. In this way, the insertion member 5 is inserted into the inserted member 204, and the engagement of the locking portions 8 ... and the locked portions 12a ..., 12b ..., 12c ..., 12d ... is repeated.

  The engagement between the above-described locking portion 8 and the locked portions 12a, 12b, 12c, 12d is repeated, and the reference line A of the inserted member 5 and the reference line B of the inserted member 204 are misaligned. Changes at intervals (P / 4) corresponding to 1/4 of the pitch P of the locking portions 8. As described above, when the insertion member 5 is inserted into the member to be inserted 204, the insertion member 5 has an interval smaller than the pitch P of the locking portions 8..., Specifically, the pitch P of the locking portions 8. The inserted member 204 is intermittently fitted and locked at an interval (P / 4) corresponding to 1/4.

  According to the inter-ring joint 203 having the above-described configuration, the interval between the insertion members 5 that are intermittently fitted and locked is smaller than the interval (P / 2) in the first embodiment. Are intermittently fitted and locked at intervals of 1/4 (P / 4) of the pitch P of the locking portions 8..., So that the pitch of the locking portions 8. In addition, the maximum opening between the inter-ring joining end faces 1b and 1b of the segment piece 1 and 1 can be set to 1/4 (P / 4) of the pitch P of the locking portion 8. The water stoppage between 1 can be further improved.

  The first, second, and third embodiments of the joint structure for a segment according to the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and does not depart from the spirit of the present invention. It can be changed as appropriate. For example, in the first, second and third embodiments described above, the concave and convex engaging portions 8 formed on the outer peripheral surface of the insertion member 5 (pin bolt portion 7) are continuously formed in the axial direction. In the present invention, as shown in FIG. 17, uneven locking portions 308... May be intermittently formed on the outer peripheral surface of the insertion member 305.

  In the first, second, and third embodiments described above, the locked portions 12 of the inserted member 4 have a triangular shape in section, but the present invention is as shown in FIG. The to-be-latched portions 312 of the inserted member 304 may be rectangular in cross section or the to-be-latched portions having other shapes. Further, in the first, second, and third embodiments described above, the locking portions 8 have a triangular shape in cross section, but the present invention has a rectangular cross section as in the locked portion. A stop part may be sufficient and the latching part of another shape may be sufficient.

  Further, the first, second, and third embodiments described above include a plurality of (four in the first embodiment, two in the second and third embodiments) snap rings 10. Intervening members 11, 111, and 211 are interposed between the snap ring groups 13, 14, 113 to 116, and 213 to 216. However, as shown in FIG. Are alternately stacked, interposition members 411 are interposed between the snap rings 410, 410, and the locking portions 408 and the locked portions 412 are arranged at different pitches (P ', 3P'). / 4). Specifically, the insertion member 405 has a configuration in which locking portions 408 and flat portions 409 are alternately arranged, and the locking portions 408 are intermittently formed on the outer peripheral surface of the insertion member 405. Consists of. At this time, the thickness dimension of the flat portion 409 is the same as the thickness dimension P of the locking portions 408..., And the pitch (P ′) of the locking portions 408. It is a value (2P) corresponding to double. On the other hand, the inserted member 404 has a thickness dimension P that is the same as the thickness dimension P of the locking portions 408 and a thickness dimension P that is 1 of the thickness dimension P of the locking portions 408. .., Which is a value (P / 2) corresponding to / 2, and the locked portions 412... Correspond to 3/4 of the pitch (P ′) of the locking portions 408. The pitch is (3P ′ / 4). With such a configuration, the locked portions 412 and the locking portions 408 can be engaged with each other at an interval having a different number of pitches. Accordingly, the inserted portions 404 are inserted into the inserted member 404 at intervals corresponding to the difference (P ′ / 4) between the pitch (3P ′ / 4) of the locked portions 412... And the pitch (P ′) of the locking portions 408. The member 405 is intermittently fitted and locked, and the maximum opening width is a value (P ′ / 4) corresponding to ¼ of the pitch (P ′) of the locking portions 408. A value (P / 2) corresponding to 1/2 of the thickness (P) of.

  In the above-described embodiment, the joint structure in the joint between rings that joins the segment pieces 1 and 1 adjacent to each other in the axial direction of the tunnel 2 is described. However, the present invention is adjacent to the circumferential direction of the tunnel. The joint structure in the joint between pieces which joins segment pieces may be sufficient.

Further, in the present invention, the pitch of the locking portion and the locked portion can be changed as appropriate, and the interval dimension (the thickness of the interposed member) formed between the locked portions is the gist of the present invention. Changes can be made as appropriate without departing from the scope. Furthermore, the number of the gaps (intervening members) formed between the locking parts, the locked parts, and the locked parts can be changed as appropriate. By increasing the number, the interval of intermittent fitting and locking between the insertion member and the member to be inserted can be reduced.
In addition, the configuration in the above embodiment may be appropriately replaced with a known configuration, and the configuration in the embodiment may be appropriately combined.

It is a figure showing the tunnel which consists of a several segment for demonstrating 1st Embodiment of the joint structure of the segment which concerns on this invention. It is sectional drawing showing the joint structure (before insertion) for demonstrating 1st Embodiment of the joint structure of the segment which concerns on this invention. It is sectional drawing showing the joint structure (after insertion) for demonstrating 1st Embodiment of the joint structure of the segment which concerns on this invention. It is a fragmentary sectional view showing the joint structure for explaining a 1st embodiment of the joint structure of the segment concerning the present invention. It is a fragmentary sectional view showing the joint structure for explaining a 1st embodiment of the joint structure of the segment concerning the present invention. It is a fragmentary sectional view showing the joint structure for explaining a 1st embodiment of the joint structure of the segment concerning the present invention. It is a fragmentary sectional view showing the joint structure for explaining a 1st embodiment of the joint structure of the segment concerning the present invention. It is a fragmentary sectional view showing a joint structure for explaining a 2nd embodiment of a joint structure of a segment concerning the present invention. It is a fragmentary sectional view showing a joint structure for explaining a 2nd embodiment of a joint structure of a segment concerning the present invention. It is a fragmentary sectional view showing a joint structure for explaining a 2nd embodiment of a joint structure of a segment concerning the present invention. It is a fragmentary sectional view showing a joint structure for explaining a 2nd embodiment of a joint structure of a segment concerning the present invention. It is the table | surface which showed the shift | offset | difference of the reference line of the insertion member with respect to the reference line of the member to be inserted for demonstrating 2nd Embodiment of the joint structure of the segment which concerns on this invention. It is a fragmentary sectional view showing a joint structure for explaining a 3rd embodiment of a joint structure of a segment concerning the present invention. It is a fragmentary sectional view showing a joint structure for explaining a 3rd embodiment of a joint structure of a segment concerning the present invention. It is a fragmentary sectional view showing a joint structure for explaining a 3rd embodiment of a joint structure of a segment concerning the present invention. It is a fragmentary sectional view showing a joint structure for explaining a 3rd embodiment of a joint structure of a segment concerning the present invention. It is a fragmentary sectional view showing the joint structure for describing other embodiments of the joint structure of the segment concerning the present invention. It is a fragmentary sectional view showing the joint structure for describing other embodiments of the joint structure of the segment concerning the present invention.

Explanation of symbols

1 Segment piece (segment)
1b Inter-ring joint end face (joint end face)
3,103,203 Joint between rings (joint structure)
4,104,204,304,404 Inserted member 5,305,405 Insert member 8,308,408 Locking portion 10,310,410 Snap ring 11,111,211,311,411 Interposing member 12,312,412 Locked part P, P 'Locking part pitch

Claims (4)

Among adjacent segments, an insertion member protrudes from the joining end surface of one segment, and a cylindrical inserted member into which the insertion member is inserted is provided at the joining end surface of the other segment,
A plurality of concave and convex engaging portions extending in the circumferential direction are formed on the outer peripheral surface of the insertion member at a constant pitch in the axial direction, and the inner peripheral surface of the inserted member extends in the circumferential direction. A plurality of concave and convex locked portions are formed in the axial direction,
The insertion member is inserted into the member to be inserted, and the locking portion is engaged with the locking portion, so that the insertion member is fitted and locked to the insertion member and is adjacent. In the joint structure of segments where the segments are jointed,
The joint structure of a segment, wherein the plurality of locked portions are formed at at least one place at intervals different from a value obtained by multiplying the pitch of the locking portions by an integer. In the joint structure of the segment according to claim 1,
The inserted member is provided with a plurality of snap rings whose inner peripheral portion is the locked portion, and an interposed member having a thickness dimension different from an integer multiple of the pitch of the locking portion,

A segment joint structure, wherein the plurality of snap rings are stacked, and the interposition member is interposed in at least one of the adjacent snap rings. In the joint structure of a segment according to claim 1 or 2,
A plurality of the interposed members interposed between the snap rings or the gap formed between the locked portions,
The locking portion and the locked portion are formed at the same pitch,
The joint structure of a segment, wherein a plurality of spacing dimensions of the locked portions or a thickness dimension of the plurality of interposed members are respectively expressed by the following formulas and have different or the same values.

In the joint structure of a segment according to claim 1 or 2,
The interval formed between the locked portions, or the interposition member interposed between the snap rings is provided between adjacent locked portions, respectively.
The joint structure of a segment, wherein the locking portion and the locked portion are formed at different pitches.

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