JP2010133112A - Segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent concrete from being cracked without propagating the deformation of male type hardware used as a segment joint structure to the concrete of an embedded part when the male type hardware is deformed to be bent by an external force when assembling segments in a ring shape. <P>SOLUTION: The male type hardware 19 embedded in a segment joint face 15 includes: a male type hardware body 19a having a locking part 19b at the tip side; a plate-like high rigidity member 20 used as an embedding member; and an anchor reinforcement 18. The high rigidity member 20 and the anchor reinforcement 18 of the male type hardware 19 are embedded in the concrete 21 of the segment joint face 15, and the front face of the high rigidity member 20 is exposed to the segment joint face 15. When the male type hardware body 19a is deformed by the external force, the deformation is received by the high rigidity member 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a concrete segment used for tunnel lining by a shield method.

  The shield method is well known as a method for safely building a tunnel on soft ground or on the ground adjacent to existing structures. This shield method has a structure in which a ring is divided radially in the rear of the shield in parallel with excavation while pushing the soil to collapse with a steel cylinder called shield while pushing the shield in the face direction. It is a method of forming the inner wall of the tunnel by connecting the segments together while assembling the segments into a ring shape with a segment assembly machine, and further connecting the segments assembled in the ring shape in the tunnel axis direction sequentially. From the viewpoint of workability of the construction method, segments having various connecting devices have been developed.

  6 and 7 (a) and (b) show an example of a conventional tunnel lining segment, and the segment joint surface 2 parallel to the tunnel axis of the concrete tunnel lining segment 1 has a face direction. Is provided with a horizontal steel female fitting 5 having a fitting portion radially expanded in the direction of the face, and the other end. In the concave portion 3 on the side, horizontal steel male fittings 4 having fitting portions that are radially expanded in the opposite direction to the face are mounted. The female metal fitting 5 is formed with a hook-shaped cross-section 5a, and the male metal fitting 4 is provided with a locking piece 4a for locking to the hook-shaped cross-section 5a.

  Furthermore, a plurality of anchor bars 6 extending in a direction perpendicular to the tunnel axis direction are fixed to the male fitting 4 and the female fitting 5, and the female fitting 5 is positioned in the recess 3. At the same time, it is embedded in segment 1. On the other hand, the male metal fitting 4 is embedded in the segment 1 together with the anchor bars 6 so that the locking piece 4a protrudes outward from the segment joint surface 2 at the position of the recess 3.

  In FIG. 6, reference numeral 7 denotes a tenon provided on the surface of the segment 1 facing the face, and an insertion hole for the through bolt 8 is provided.

  When the segments 1 configured as described above are connected in the circumferential direction and assembled in a ring shape, the segment assembly surface 2 on which the female fitting 5 of one segment 1 is mounted is attached to the segment assembly machine. After the segment joint surface 2 on which the male fitting 4 of the other segment 1 to be carried is attached is approached, the male fitting of the other segment 1 is placed on the bowl-shaped cross section 5a of the female fitting 5 of the one segment 1 4 is engaged by moving the other segment 1 in a direction parallel to the face direction, and the segment joining surfaces 2 of both segments 1 are brought into contact with each other, and mortar is put on the joining surfaces of both segments. Filling is performed to join the segments 1 (see, for example, Patent Document 1).

FIGS. 8 to 10 show other examples of conventional segments. A concave portion 10 is formed on the joint surface 2 of the segment 9 having the segment joint surface 2 parallel to the tunnel axis direction so as to extend in the face direction. Then, in the concave portion 10 of the joint surface 2 on one end side, the male joint 11 having the lock portion 11c on the other end side of the base portion 11a with the anchor bar 11b fixed on one end side, and the lock portion 11c on the joint surface 2 are provided. Embedded in the recessed portion 10 of the joint portion 2 on the opposite side so as to be exposed at an angle with respect to the required angle, and a locking portion on the other end side of the base portion 12a with the anchor muscle 12b fixed on one end side The female joint 12 having 12c is embedded so as to be exposed in a state where the engaging portion 12c is inclined with respect to the joint surface 2 at a required angle corresponding to the engaging portion 11c of the male joint 11. is there.
Reference numeral 13 denotes a reinforcing steel plate fixed to the front end surface of the locking portion 11c of the male joint 11.

  When joining the segment 9 having the joint structure having the above-described structure to assemble it into a ring shape, the other segment 9 is connected to the male joint 11 on the joint surface 2 where the female joint 12 of one segment 9 is embedded. After the embedded joint surface 2 is positioned so as to approach, the other segment 9 is moved in a direction parallel to the face direction, so that the locking portion 11c of the male joint 11 is moved to the one segment 9 8 is engaged with the engaging portion 12c of the female joint 12 and joined as shown in FIG. 8 (see, for example, Patent Document 2).

Japanese Patent Application Laid-Open No. 08-232585 JP 2000-328889 A

  However, in the case of the segment 1 shown in FIGS. 6 and 7 (a) and 7 (b) and the segment 9 shown in FIGS. 8 to 10, the fitting on the male side of the joint structure protrudes beyond the segment joining surface. As a thing. That is, in the segment 1 shown in FIGS. 6 and 7 (a) and (b), the male fitting 4 is left as it is in the concrete of the segment 1 with the locking piece 4a of the male fitting 4 protruding from the segment joining surface 2. It is a buried structure.

  Further, the segment 9 shown in FIGS. 8 to 10 also has a configuration in which the male joint 11 is embedded in the concrete of the segment 9 in a state in which the engaging portion 11c of the male joint 11 protrudes from the joining surface 2 of the segment. It is as.

  Therefore, when any of the conventional segments 1 and 9 is assembled in a ring shape, the segment 1 or 9 supported by the segment assembling machine is brought close to the segment to be joined. In addition, the protruding male fitting 4 and the male joint 11 may abut against each other, and an external force may be applied to the male fitting 4 and the male joint 11. When the male fitting 4 or male fitting 11 of the segment to be assembled is pushed into the female fitting 5 or female fitting 12 of the segment to be joined, An external force may be applied to the joint 11.

  As described above, the external force applied to the male fitting 4 and the male joint 11 at the time of assembling the segments is from various directions, and when an external force acts on the male fitting 4 and the male joint 11, the male fitting 4 Or the male joint 11 is deformed to bend.

  As a result, there is a problem that cracks occur in the concrete in contact with the male fitting 4 and the male joint 11 at the joint surface 2 of the segment.

  Therefore, according to the present invention, when the segments are assembled in a ring shape, even if the male or female hardware of the segment joint structure is deformed by external force, cracks occur in the concrete on the segment joint surface. In order to make it easier to engage the male and female hardware when assembling the segment, and after the engagement, only the tensile force acts on the male and female hardware. In order to prevent the male or female hardware from losing the function as a joint after segment joining.

  In order to solve the above problems, the present invention engages a female joint of a segment in which a male joint and a female joint are embedded in a segment joint surface and a male joint of another segment. In a concrete tunnel lining segment made to assemble the segment, a male hardware body having a locking portion at the tip, an embedding member for supporting the male hardware body, and an anchor bar The male metal fitting is configured as a male joint, the male metal embedding member and the anchor bar are embedded in the embedded portion of the male joint on the segment joint surface, and the male hardware main body is segmented. The segment has a configuration in which an embedding member is exposed and embedded in the segment joint surface so as to protrude from the joint surface.

  The segment may have a tenon groove or tenon formed on the segment joining surface.

  Further, the embedding member in the above configuration is a plate-like or rectangular block-like high-rigidity member, a male metal body is attached to the front side of the high-rigidity member, and anchor bars are attached to the rear side, thereby providing high rigidity. The elastic member and the anchor muscle are embedded by embedding the member and the anchor muscle, or by making the elastic member and supporting the male metal body inside the elastic member and attaching the anchor wire to the male hardware body. It shall be embedded.

  Furthermore, a female metal fitting that has a locking portion for engaging the locking portion of the male metal mold main body at the front end portion and has an elastic member attached to the outer periphery of the metal fitting with the anchor muscle fixed to the rear end side, It is embedded in the segment joint surface or the segment joint surface formed with a tenon groove or tenon so that the female mold can behave elastically when engaged with the male mold.

  As a result, the segment of the present invention utilizes the fact that during the assembly work, the male and female hardware can be easily engaged and only the tensile force of the hardware acts after the engagement. Does not impair the function of the joint.

According to the segment of the present invention, the following excellent effects can be obtained.
(1) A segment is assembled by engaging a female joint of a segment in which a male joint and a female joint are embedded in the segment joint surface and a male joint of another segment. In a concrete tunnel lining segment, a male fitting comprising a male hardware body having a locking portion at the tip, an embedding member for supporting the male hardware body, and an anchor bar is a male joint. The male member for embedding and the anchor bar are embedded in the embedded part of the male joint on the segment joint surface, and the male member is protruded from the segment joint surface. The male mold protrudes from the segment joint surface when assembling the segment because the segment has a configuration in which the segment is exposed and embedded in the segment joint surface. Even if the object body is deformed such that it is bent due to an external force, the deformation of the male metal body is not transmitted to the concrete of the segment, but is supported by the embedding member embedded in the concrete. be able to. Thereby, it is possible to prevent the occurrence of cracks in the concrete in the embedded portion of the male mold.
(2) Tensile metal fittings are embedded in the joint surface of the segment having the tenon groove or tenon formed on the segment joint surface in the same manner as described above, so that the tenon and the tenon groove are fitted when the segments are joined. As a result, the segments can be firmly bonded to each other at an appropriate position.
(3) The embedding member is a plate-like or rectangular block-like high-rigidity member, the male metal body is attached to the front surface side of the high-rigidity member, and the anchor bar is attached to the rear surface side. By adopting a structure in which the anchor muscle is embedded, the deformation of the male hardware main body can be received by the high rigidity member, and the deformation of the male hardware main body is not transmitted to the concrete in which the high rigidity member is embedded. It is possible to prevent the occurrence of cracks in the concrete.
(4) Further, the embedding member is an elastic member, the male metal body is supported inside the elastic member, and the anchor bar is attached to the male metal body so that the elastic member and the anchor bar are embedded. By adopting the configuration described above, the deformation of the male metal body can be absorbed by the elastic member and can be prevented from being transmitted to the concrete, and the occurrence of cracks in the concrete can be prevented. At this time, since the tensile rigidity after segment joining does not decrease, the function as a segment can be satisfied.
(5) A female metal fitting formed by attaching an elastic member to the outer periphery of a metal fitting having a locking portion for engaging the locking portion of the male metal mold main body at the front end and anchoring anchor bars on the rear end side. By embedding it in the segment joint surface, or in the segment joint surface formed with a tenon groove or tenon, the female hardware can behave elastically when engaged with the male hardware. And the male metal fitting can be easily engaged, and after the engagement, only the tensile force of the hardware can be used, and the function of the joint is not impaired.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  1 (a), (b), and (c) show an embodiment of the present invention, and a segment joint surface 15 formed on one end side in the circumferential direction of a concrete tunnel lining segment 14 is shown in FIG. A female is provided with a concave portion 16 having a required length so as to extend in the face direction, and having a locking portion 17a at a front end portion at a required position of the concave portion 16 and an anchor bar 18 fixed at a rear end side. The mold 17 is embedded so that the locking portion 17 a protrudes into the recess 16.

  A feature of the present invention is that a special male metal piece 19 for joining the segments to be engaged with the engaging portion 17a of the female metal piece 17 is attached to the segment on which the female metal piece 17 is attached. The segment 14 is formed by being embedded in the segment joint surface 15 on the side opposite to the joint surface.

  More specifically, the segment 14 of the present invention has a wedge-like shape in which the locking portions 19b correspond to the locking portions 17a of the female hardware 17 on both the upper and lower side surfaces on the front end side of the male metal body 19a made of steel plate. And the base end side of the male mold body 19a is embedded with a length and width larger than the width dimension and thickness dimension of the male mold body 19a and having a required thickness. The steel plate-like high-rigidity member 20 as a member is fixed to one side by welding.

  One end of a plurality of anchor bars 18 is attached to the opposite surface of the high-rigidity member 20 by welding, and a male-metal body 19a, the high-rigidity member 20 and the anchor bars 18 are integrated into a segment. Except for the front surface of the high-rigidity member 20 and the male metal body 19a, the high-rigidity member 20 and the anchor bars 18 are embedded in the concrete 21 and attached to the joint surface 15.

  When assembling the segment 14 of the present invention in which the male metal piece 19 is attached to the segment joint surface 15 into a ring shape, as shown in FIG. 1 (a), the female metal piece 17 is embedded. The male metal piece 19 is moved in the direction of the arrow a so that the segment joint surface 15 on which the male metal piece 19 of the segment 14 of the present invention protrudes approaches the segment joint surface 15 of another segment 14 on the joint side. Is inserted into the recess 16 of another segment 14.

  Next, the segment 14 of the present invention is moved in the direction parallel to the face direction or in the direction of the arrow b, and the locking portion 19b of the male metal piece 19 is engaged with the locking portion 17a of the female metal piece 17, so that the male mold The hardware 19 and the female hardware 17 are fitted. At this time, since the locking portion 19b of the male metal piece 19 and the locking portion 17a of the female metal piece 17 are wedge-shaped, the segment 14 of the present invention is brought into close contact with another segment 14 by fitting them together. Will be allowed to.

  When the segment 14 of the present invention is moved so as to approach another segment 14, or when the male metal fitting 19 attached to the segment 14 of the present invention is pushed in to engage the female metal fitting 17 of another segment 14 Even when the male hardware main body 19a of the male metal hardware 19 is deformed by bending due to external force, the male hardware main body 19a is welded to the plate-like high-rigidity member 20. Therefore, the deformation of the male metal main body 19a is received by the high-rigidity member 20. Since the deformation received by the high-rigidity member 20 is not transmitted to the concrete 21, it is possible to prevent the concrete 21 from cracking.

  Next, FIGS. 2 (a) and 2 (b) show another embodiment of the segment of the present invention. Like the embodiment shown in FIGS. 1 (a), (b) and (c), the male type is shown. The metal main body 19a is attached to the plate-like high-rigidity member 20, and a plurality of anchor bars 18 are attached to the high-rigidity member 20, and the high-rigidity member 20 and the anchor bars 18 are embedded in the joint surface 15 of the segment. In the configuration in which the mold body 19a is projected from the front surface of the high-rigidity member 20, the front end face side of the block-like high-rigidity member 22 having a rectangular cross-section instead of the plate-like high-rigidity member 20 is used. A narrow groove-shaped recess 22a having a required depth is formed, and the width dimension in the front-rear direction is smaller than that of the male metal body 19a shown in FIGS. 1 (a), (b), and (c). Insert the enlarged male mold body 19a to fix it. And so as to be integrated.

  Further, one end of a plurality of anchor bars 18 is attached to the rear end face side of the high-rigidity member 22 by welding to constitute a male metal piece 19A.

  The segment 14 of the present invention is configured such that the male metal 19A having the above-described configuration is embedded in the male metal embedding portion 15 in the segment joint surface 15, and the high-rigidity member 22 and the anchor bar 18 are embedded. When the male mold body 19a of the male mold 19A is deformed by receiving an external force, the deformation is not transmitted to the concrete 21 by receiving the block-like high-rigidity member 22.

  Other configurations are the same as those shown in FIGS. 1A, 1B and 1C, and the same components are denoted by the same reference numerals.

  According to this embodiment, the high-rigidity member 22 is embedded in the segment joint surface 15 as in the case of the embodiment shown in FIG. 1, and the male metal body 19 a is supported by the high-rigidity member 22. Therefore, even if the male hardware main body 19a is deformed by receiving a load that bends due to an external force applied to the male hardware main body 19a at the time of assembling the segments, the high-rigidity member 22 can deform the male hardware main body 19a. Can receive. As a result, the deformation of the male hardware body 19a is not transmitted to the concrete 21, and cracks can be prevented from occurring in the concrete 21.

  FIGS. 3A and 3B show still another embodiment of the segment of the present invention. Instead of embedding the high-rigidity members 20 and 22 in the above-described embodiments, An elastic member 23 made of rubber or the like is embedded in the embedded portion of the male metal fitting in the segment joint surface 15 so that the male metal main body 19a is held inside the embedded elastic member 23. The rear end side of the mold body 19a is exposed from the elastic member 23 so as to constitute a male mold 19B in which a plurality of anchor bars 18 are fixedly mounted. The elastic member 23 and the anchor of the male mold 19B are configured. The streak 18 is embedded in the concrete 21 of the segment joint surface 15.

  Other configurations are the same as those shown in FIGS. 1A, 1B and 1C, and the same components are denoted by the same reference numerals.

  According to this embodiment, since the male hardware main body 19a is interposed between the concrete 21 and the elastic member 23, when the male hardware main body 19a is deformed by receiving external force during assembly of the segment, The deformation can be absorbed by the elastic member 23, and the deformation of the male metal body 19 a can be prevented from being transmitted to the concrete 21. At this time, since the male metal body 19a is held inside the elastic member 23, even if the bending rigidity of the male metal body 19 is weakened, the tensile rigidity is not lowered by the anchor bar 18. The function of the joint is not impaired, and the function can be satisfied as a segment. This can prevent cracks from occurring in the concrete 21.

  4 (a) and 4 (b) show still another embodiment of the present invention. As the embedding members used for the male metal fittings 19, 19A and 19B in the respective embodiments, FIG. Of the high-rigidity member 20, high-rigidity member 22, and elastic member 23 such as rubber, for example, the elastic member 23 such as rubber is required to be provided on the segment joint surface 15 of the segment 14 as shown in FIG. A special female is attached to the outer periphery of a female hardware 17 embedded in a required position of the recess 16 having a length and having a locking portion 17a at the front end and an anchor bar 18 fixed to the rear end. This is a mold 17A.

  That is, similarly to the elastic member 23 such as rubber as the embedded member in the embodiment shown in FIGS. 3 (a) and 3 (b), the elastic member having a cylindrical shape having a cavity 23a penetrating in the front-rear direction. As shown schematically in FIGS. 4 (a) and 4 (b), the upper and lower two sheets have locking portions 17a on the lower surface of the front end portion and the upper surface of the front end portion, respectively, and anchor bars 18 are fixed on the rear end side. It is set to a size that can be fitted and attached to the outer periphery of the female mold 17 made of the above-mentioned hardware.

  Further, the elastic member 23 corresponds to the recess 16 formed on the embedded side of the female mold 17 in the segment joint surface 15 formed at the end of the segment 14 in the circumferential direction. When attached to the outer periphery, a notch 23b is provided in the portion located in the recess 16 so that the elastic member 23 does not become an obstacle to the engagement with the male metal parts 19, 19A, 19B.

  When embedding the female metal fitting 17A formed by attaching the elastic member 23 such as rubber as described above in the segment joint surface 15, the elastic member 23 such as rubber is placed on the segment joint surface 15 in the face direction. It is embedded in a required position of a recess 16 having a required length provided so as to extend. Next, the portion of the female mold 17A excluding the anchor bar 18 is inserted and held in the embedded elastic member 23 as shown in FIG. It is made to embed in the concrete through the elastic member 23. As a result, when the locking portion 17a of the female metal piece 17A receives an external force at the time of locking with the male metal piece 19, 19A, 19B during assembly of the segment, the elastic member 23 of the outer peripheral portion elastically It can deform | transform and can prevent that a crack generate | occur | produces in the concrete of the segment joint surface 15 beforehand.

  Further, according to this embodiment, when the female metal piece 17A is installed on the segment joint surface 15, it is fixed by the anchor bar 18 even if the bending rigidity of the metal piece is weakened by the elastic member 23 as described above. Therefore, the tensile rigidity is not lowered, and the function as a segment can be sufficiently achieved as in the case of the male metal piece 19B described above.

  The present invention is not limited to the above-described embodiment. For example, as shown in FIG. 5, for example, the segment joint surface 15 has a mortise groove 24 and the opposite segment joint surface. A tenon that can be fitted into the tenon groove 24, or a tenon groove and tenon provided on one segment joint surface, and a tenon groove corresponding to the tenon groove on the other side, tenon corresponding to the tenon In a segment having a mortise groove, male hardware 19, 19A, as shown in FIGS. 1 (a), (b), (c), FIG. 2 (a), (b), and FIGS. 19B and a joint structure including a female joint 17A as shown in FIG. 4 (a) may be applied, and a male joint and a female joint may be embedded in one segment joint surface. In this segment, Can be applied to the segments, it is of course that various changes and modifications may be made without departing from the scope and spirit of the other present invention.

1 shows an embodiment of a segment of the present invention, (A) is a schematic plan view showing a state during segment assembly construction, (B) is a cross-sectional view taken along the line A-A in (A), (C) is It is a perspective view of (b). The other embodiment of the segment of this invention is shown, (A) is a figure corresponding to FIG. 1 (B), (B) is a perspective view of (A). FIG. 7 shows still another embodiment of the segment of the present invention, in which (A) corresponds to FIG. 1 (B), and (B) is a perspective view of (A). The further another form of implementation of the segment of this invention is shown, (A) is an expanded cut side view taken along the line B-B of FIG. 1 (A) when an elastic member is attached to the outer periphery of the female metal part. (B) is a perspective view of the elastic member. It is a perspective view which shows the other example of the joint surface of the segment of this invention. It is a perspective view which shows an example of the segment which has the conventional segment joining structure. FIG. 7 shows a joint structure used in the segment shown in FIG. 6, (A) is a perspective view of a male fitting, and (B) is a perspective view of a female fitting. It is a perspective view which shows the state which provided the male coupling | joint in the segment joint surface as another example of the conventional segment. It is a perspective view which shows the state which provided the female coupling in another segment joint surface of the segment shown in FIG. FIG. 10 is a cross-sectional view showing a state where the male joint and the female joint shown in FIGS. 8 and 9 are engaged.

Explanation of symbols

14 segment 15 segment joint surface 17 female mold 17a locking part 17A female mold 18 anchor bar 19 male mold 19a male mold body 19b locking section 19A male mold 19B male mold 20 high rigidity member (embedding member) )
21 Concrete 22 High rigidity member (embedding member)
23 Elastic member (embedding member)

Claims (6)

  A segment made of concrete in which a male joint of a segment with a male joint and a female joint embedded in the segment joint surface is engaged with a male joint of another segment to assemble the segment. In the tunnel lining segment, a male hardware body composed of a male hardware body having a locking portion at the tip, an embedding member that supports the male hardware body, and an anchor bar is configured as a male joint. Then, the male metal embedment member and anchor bar are embedded in the embedded portion of the male joint on the segment joint surface, and the embed member is protruded from the segment joint surface so that the male metal body protrudes from the segment joint surface. A segment having a structure in which it is exposed and buried in a joint surface.   2. The male metal fitting is embedded in the joint surface of a segment having a tenon groove or tenon formed on the segment joint surface, with an embedding member and an anchor bar embedded so that the male metal body protrudes. Segment.   The embedding member is a plate-like or rectangular block-like high-rigidity member, the male metal body is attached to the front side of the high-rigidity member, and the anchor bar is attached to the rear side, so that the high-rigidity member and the anchor bar are attached. The segment according to claim 1 or 2, wherein the segment is embedded.   The embedding member is an elastic member, and the male metal main body is supported inside the elastic member, and an anchor bar is attached to the male metal main body so that the elastic member and the anchor bar are embedded. Or the segment of 2.   A segmented joint of a female metal fitting with an elastic member attached to the outer periphery of a metal fitting having a locking portion for engaging the locking portion of the male hardware main body at the front end and an anchor bar fixed to the rear end side. The segment according to claim 1, wherein the segment is embedded in a surface so that the female mold can behave elastically when locked with the male mold.   A female metal fitting having a locking portion for engaging the locking portion of the male hardware main body at the front end and an elastic member attached to the outer periphery of the hardware having an anchor bar fixed to the rear end side, 6. The segment according to claim 5, wherein the segment is embedded in a joining surface of the tenon-formed segment.

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