JP5155614B2 - Tunnel segment connection structure - Google Patents

Description

  The present invention relates to a tunnel segment adjacent to each other in the circumferential direction of the tunnel, but the joint surfaces formed at the end portions of the reinforced concrete segment body in the circumferential direction of the tunnel face each other, and are connected to each other by a connector. A surface or an outer peripheral surface is formed into a curved surface that is curved along the tunnel circumferential direction, and the joint surface is an inclined surface that is inclined with respect to a normal line of the curved surface at an intersection with the joint surface. The coupling tool is integrally formed with an engagement metal fitting that faces the engagement portion on the joint surface side and an anchor bar embedded in the segment body, and the segments are relatively moved in the tunnel longitudinal direction. Thus, the present invention relates to a tunnel segment connection structure in which the engagement hardware is engaged and connected to each other.

In the tunnel segment connecting structure, for example, among the adjacent tunnel segments in the circumferential direction of the tunnel, a segment (hereinafter referred to as a key segment) that is finally pushed in between the left and right existing segments is referred to as the left and right existing segments. When connecting, connect the joint surface to the joint surface so that the anti-mouth side part of the key segment is inserted into the left and right existing segments from the tunnel diameter direction in advance and can be pushed in from the face side with a short push stroke. Is formed on an inclined surface inclined with respect to the normal line of the curved surface.
However, in the conventional tunnel segment connecting structure, since the engagement hardware is fixed to the segment body so that the engagement direction of the engagement hardware is perpendicular to the joint surface, it is integrated with the engagement hardware. The anchor bars do not fit well, and the anchor bars can be embedded at an appropriate depth according to the curvature of the curved surface of the segment body. It is installed at a mounting angle that is greatly inclined (appropriate prior art document information cannot be found).

For this reason, since the attachment angle of the anchor bar to the engagement hardware differs greatly depending on the curvature of the curved surface of the segment body, various connecting tools corresponding to the curvature of the curved surface of the anchor bar to the engagement hardware are provided. There is a drawback that it is necessary to manufacture and it is difficult to reduce the manufacturing cost of the tunnel segment.
Further, since the anchor bars are attached to the engagement hardware at an attachment angle that is largely inclined with respect to the engagement direction of the engagement hardware, a large stress concentration tends to occur at the attachment site of the anchor muscles to the engagement hardware. There are drawbacks.
The present invention has been made in view of the above circumstances, and it is easy to reduce the manufacturing cost of a tunnel segment, and a tunnel segment connecting structure that does not easily cause a large stress concentration at an attachment site of an anchor bar to an engagement hardware. The purpose is to provide.

FEATURES configuration of the present invention, a segment tunnel adjacent tunnel circumferential direction, against the reinforced concrete segment joints surfaces forming the tunnel circumferential end of the body to each other, Yes linked to each other by a connecting member,
The inner peripheral surface or outer peripheral surface of the segment body is formed on a curved surface that is curved along the tunnel circumferential direction,
The joint surface is formed on an inclined surface that is inclined with respect to the normal line of the curved surface at the intersection with the joint surface;
The connector is integrally provided with an engagement metal that makes an engagement portion face the joint surface side and an anchor bar embedded in the segment body,
A tunnel segment connecting structure in which the segments are relatively moved in the longitudinal direction of the tunnel so that the engaging hardware is engaged with each other and connected to each other.
The engagement hardware is a male engagement hardware and a female engagement hardware provided separately for each of the segment bodies connected to each other,
The male engagement hardware and the female engagement hardware are engaged by inserting an insertion shaft member provided in the male engagement hardware into an insertion hole provided in the female engagement hardware,
The engagement direction of the male engagement hardware and the female engagement hardware is such that the axial direction of the anchor muscle connected to the male engagement hardware and the axis of the anchor muscle connected to the female engagement hardware. The male engagement hardware and the female engagement hardware are formed so as to intersect at least one of the central directions,
The engagement direction, the axial center direction of the anchor muscle connected to the female engagement hardware, and the axial direction of the anchor muscle connected to the male engagement hardware are all relative to the joint surface. The engagement hardware is fixed to the segment body so as to incline in a direction along the curved surface rather than a right angle direction.

[Action and effect]
Since the engagement hardware is fixed to the segment body so that the engagement direction of the engagement hardware is inclined in the direction along the curved surface rather than the direction perpendicular to the joint surface, the engagement hardware is engaged with each other. Even if the joint direction is easily aligned with the tangential direction of the curved surface at the intersection with the joint surface and the anchor bar is attached to the engagement hardware along the engagement direction of the engagement hardware, It is easy to embed the muscle at an appropriate depth according to the curvature of the curved surface of the segment body.
Further, even when the anchor bar is attached to the engagement hardware at an attachment angle that is inclined with respect to the engagement direction of the engagement hardware, the attachment angle can be attached at a smaller angle than in the past. .
Therefore, even if the curvature of the curved surface of the segment body is different, use a connector with the same angle of attachment of the anchor muscle to the engagement hardware corresponding to a wide curvature range, so that the anchor muscle can be used for the curvature of the curved surface of the segment body. It is possible to embed at an appropriate depth, and it is easy to reduce the manufacturing cost of the tunnel segment by reducing the types of couplers having different attachment angles of the anchor bars to the engagement hardware.
Moreover, even when the anchor bar is attached to the engagement hardware at an attachment angle that is inclined with respect to the engagement direction of the engagement hardware, the anchor angle is attached at a smaller angle than in the conventional case. It is possible to embed the segment body at an appropriate depth according to the curvature of the curved surface, and it is difficult for a large stress concentration to occur at the attachment site of the anchor muscle to the engagement hardware.

In addition, the anchor bar is inclined in the direction along the curved surface rather than the engagement direction of the engagement hardware, and is embedded in the segment main body. Therefore, the anchor bar has an appropriate depth corresponding to the curvature of the curved surface of the segment main body. It is easy to embed.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a substantially cylindrical circular segment ring R in which three types of tunnel segments A, B, K adjacent to each other in the circumferential direction of the tunnel are connected. As shown in FIG. Three B segments B having three A segments A having left and right side edges 1a, side edges 1a parallel to the tunnel longitudinal direction, and inclined side edges 1b inclined with respect to the tunnel longitudinal direction; The K segment K provided with the inclined side 1b symmetrically is connected.

  FIGS. 3 to 5 show one of a pair of B segments B that are placed symmetrically in advance to form the upper part of the tunnel ring R, and a pair of segments B that are pushed in and finally connected K A tunnel segment connection structure according to the present invention with a segment (hereinafter referred to as a key segment) K is shown.

  The B segment B and the key segment K are provided at two locations in the tunnel longitudinal direction by abutting the end faces in the tunnel circumferential direction of each segment body 2, that is, the joint surfaces 3 formed along the inclined side 1b. Are connected to each other by a pair of connecting tools 4 (4a, 4b), and each segment body 2 is made of reinforced concrete in which reinforcing reinforcing bars 5 are arranged in a hook shape, and is connected to the end face on the anti-mouth side. A male fitting 6a is provided, and a connecting female fitting 6b is provided on the end face of the face.

  Both the key segment K and the B segment B are formed with the same constant width along the tunnel longitudinal direction, and each joint surface 3 has an opening with respect to the line segment L1 along the tunnel longitudinal direction in plan view. The key segment K is formed so as to be inclined toward the key segment K toward the side, and the key segment K is formed in a substantially trapezoidal shape (isosceles trapezoidal shape) that is symmetrical in a plan view.

  As shown in FIGS. 4 and 5, the B segment B and the key segment K are configured so that the inner peripheral surface 7 and the outer peripheral surface 8 of the segment body 2 are substantially parallel to each other along the tunnel circumferential direction. The joint surface 3 has a key segment K with the outer peripheral surface 8 facing upward, and a joint surface 3 between the pair of B segments B along the joint surface 3 in a substantially vertical direction. Inclined with respect to the normal L2 of the curved surface (inner peripheral surface 7 or outer peripheral surface 8) at the intersection with the joint surface 3 in a front view along the tunnel longitudinal direction so that it can enter from the tunnel radial direction It is formed on the inclined surface.

  The connector 4 is integrally provided with an engagement hardware 10 that causes the engagement portion 9 to face the joint surface 3 side and an anchor bar 11 embedded in the segment body 2, and a male engagement metal as the engagement hardware 10. A pair of connectors 4 (4a, 4b) comprising a combination of a male connector 4a provided with the object 12 and a female connector 4b provided with a female engagement metal 13 as the engagement metal 10. The B segment B and the key segment K are connected to each other at two positions, the anti-mouth side and the face side.

  As shown in FIG. 6, the male engagement hardware 12 includes an insertion shaft member 9 a as an engagement portion 9 that is inserted into the female connector 4 b from the longitudinal direction of the tunnel, and a fixing member 14 a that is fixed to the segment body 2. And a connecting member 15 for connecting the insertion shaft member 9a to the fixing member 14a. The connecting member 15 is formed in a plate shape whose dimension in the segment thickness direction is smaller than that of the insertion shaft member 9a. It is integrally provided at a position between the member 9a and the fixing member 14a.

  As shown in FIG. 6, the female engagement hardware 13 includes an inserted member 16 in which an insertion hole 9 b is formed as an engagement portion 9 into which the insertion shaft member 9 a can be inserted from the longitudinal direction of the tunnel, and a segment body. And a fixing member 14b fixed to 2 is integrally provided, and the inserted member 16 is formed with a slit 17 that allows the connecting member 15 to be inserted when the insertion shaft member 9a is inserted into the insertion hole 9b.

  The pair of connectors 4 (4a, 4b) includes a male connector 4a fixed to the B segment B and a female connector fixed to the key segment K as a pair of anti-mouth side connectors. As a pair of coupling tools on the face side, a pair of a female coupling tool 4b fixed to the B segment B and a male coupling tool 4a fixed to the key segment K is provided. It is provided.

  Further, when the key segment K is pushed between the B segments B on the face side of the joint surface 3 in the B segment B and on the opposite side of the joint surface 3 in the key segment K, the male engagement hardware 12 is provided. A lateral groove 18 is formed to allow the entry of.

  Then, as shown in FIG. 1 (a), the anti-mouth side portion of the key segment K is inserted between the left and right B segments B in advance from the tunnel radial direction, and is then inserted between the B segments B by a pushing device (not shown). Are pushed toward the mouth side and the key segment K and the B segment B are moved relative to each other in the longitudinal direction of the tunnel, so that each male engagement hardware 12 enters the groove 18 and each insertion shaft member 9a is moved. Each of the female engagement fittings 13 is inserted into the insertion hole 9b, and the engagement fittings 10 (12, 13) are engaged with each other in the protruding direction from the segment body 2 of the insertion shaft member 9a. A segment ring R is constructed by connecting the segments K to each other as shown in FIG.

As shown in FIGS. 4 and 5, the male engagement hardware 12 and the female engagement hardware 13 are respectively engaged in the engagement direction X of the engagement hardware 10 (12, 13), that is, of the connecting member 15. The direction passing through the center position in the thickness direction and passing through the axis of the insertion shaft member 9a is inclined in the direction along the curved surface (the inner peripheral surface 7 or the outer peripheral surface 8) rather than the direction perpendicular to the joint surface 3. Thus, it is fixed to the segment body 2.

  Further, each of the anchor bars 11 of the male connector 4a and the female connector 4b provided in the key segment K is engaged with the engagement hardware 10 (12, 13) in a front view along the tunnel longitudinal direction. Along the direction X, the male connector 4a and the female connector are provided in the B segment B and are substantially entirely embedded inside the reinforcing reinforcing bars 5 arranged in a hook shape on the segment body 2. Each of the anchor bars 11 of 4b is a direction along the curved surface (inner peripheral surface 7 or outer peripheral surface 8) rather than the engagement direction X of the engagement hardware 10 (12, 13) in front view along the tunnel longitudinal direction. The entire reinforcement body 5 is embedded inside the segment main body 2 in a hook shape.

[Other Embodiments]
1. In the tunnel segment connection structure according to the present invention, each of the male connector and the anchor muscle of the female connector constituting the pair of connectors is viewed in the engagement direction between the engagement hardware in a front view along the tunnel longitudinal direction. It may be embedded in the segment body.
2. In the tunnel segment connecting structure according to the present invention, each of the male connector constituting the pair of connectors and the anchor muscles of the female connector is viewed from the engagement direction of the engagement hardware in front view along the tunnel longitudinal direction. Also, it may be inclined in the direction along the curved surface and embedded in the segment body.
3. In the tunnel segment connecting structure according to the present invention, adjacent tunnel segments in the tunnel circumferential direction are formed by connecting joint surfaces parallel to the tunnel longitudinal direction formed at the tunnel circumferential end of the segment body, that is, FIG. The joint surfaces along the side 1a parallel to the tunnel longitudinal direction in the A segment A and B segment B exemplified in Fig. 2 may be butted together and connected to each other with a connector.
4). The tunnel segment connection structure according to the present invention may be formed in a curved surface in which the inner peripheral surface or the outer peripheral surface of the segment body is elliptically curved along the tunnel circumferential direction.
5. The tunnel segment connection structure according to the present invention may be formed on a curved surface in which one of the inner peripheral surface or the outer peripheral surface of the segment body is curved along the tunnel circumferential direction.
6). A tunnel segment connection structure according to the present invention is a connection in which a female engagement hardware and an anchor bar are integrally provided so that each of adjacent segments in the circumferential direction of the tunnel faces an insertion hole as an engagement portion on the joint surface side. Fix the fixture, and connect the male engagement hardware with a pair of left and right insertion shafts as an engagement part to the segments in the tunnel longitudinal direction so that each insertion shaft member enters the insertion hole of each connection tool. By moving relative to each other, the female engaging hardware may be engaged with each other via the male engaging hardware and connected to each other.
In this case, the parallel direction of the pair of left and right insertion shaft members in the male engagement hardware is the engagement direction between the engagement hardware.

Tunnel ring perspective view Exploded view of the segments that make up the tunnel ring Partial sectional plan view showing tunnel segment connection structure Sectional view taken along line IV-IV in FIG. Cross-sectional view taken along line VV in FIG. Description perspective view of coupling tool

2 Segment body 3 Joint surface 4 Connecting tool 7 Inner peripheral surface (curved surface)
8 Peripheral surface (curved surface)
9 Engagement section 10 Engagement hardware 11 Anchor bar B segment (B segment)
K segment (K segment)
L2 normal X engagement direction

Claims (1)

The adjacent tunnel segments in the tunnel circumferential direction are connected to each other by a coupling tool, with the joint surfaces formed at the end of the tunnel circumferential direction of the reinforced concrete segment body facing each other.
The inner peripheral surface or outer peripheral surface of the segment body is formed on a curved surface that is curved along the tunnel circumferential direction,
The joint surface is formed on an inclined surface that is inclined with respect to the normal line of the curved surface at the intersection with the joint surface;
The connector is integrally provided with an engagement metal that makes an engagement portion face the joint surface side and an anchor bar embedded in the segment body,
A tunnel segment connecting structure in which the segments are relatively moved in the longitudinal direction of the tunnel so that the engaging hardware is engaged with each other and connected to each other.
The engagement hardware is a male engagement hardware and a female engagement hardware provided separately for each of the segment bodies connected to each other,
The male engagement hardware and the female engagement hardware are engaged by inserting an insertion shaft member provided in the male engagement hardware into an insertion hole provided in the female engagement hardware,
The engagement direction of the male engagement hardware and the female engagement hardware is such that the axial direction of the anchor muscle connected to the male engagement hardware and the axis of the anchor muscle connected to the female engagement hardware. The male engagement hardware and the female engagement hardware are formed so as to intersect at least one of the central directions,
The engagement direction, the axial center direction of the anchor muscle connected to the female engagement hardware, and the axial direction of the anchor muscle connected to the male engagement hardware are all relative to the joint surface. A tunnel segment connection structure in which the engagement hardware is fixed to the segment body so as to be inclined in a direction along the curved surface rather than a right angle direction.

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