JP2017210769A - Joint structure of segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure of segments capable of enhancing the strength of a joint between segments with a relatively simple construction and eventually reducing the labor and cost in manufacturing.SOLUTION: A joint structure of segments 1 includes a pair of girders 4 and 4 provided at both ends in the tunnel axial direction, a pair of joint plates 5 and 5 provided at both ends in the tunnel circumferential direction, a skin plate 6 facing the natural ground, joint hardware 7 and 7 provided on the joint plate 5, a concrete part 3 to fill the space surrounded by the girders 4 and 4, the joint plates 5 and 5 and the skin plate 6, and a reinforcement member 8 including a horizontal plate 81 in parallel with the skin plate 6 that connects a pair of the girders 4 and 4 to one of the joint plates 5 on the inner space side of the joint hardware 7 and 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a joint structure for a segment.

In the shield method, the TBM method, and the like, a tunnel lining is formed by connecting a tubular segment ring in the ground along with excavation of natural ground. The segment ring is formed by connecting end surfaces (joint plates) of a plurality of segments.
As such a segment, for example, as shown in Patent Document 1, there is a concrete-integrated steel segment (synthetic segment) in which a steel shell and concrete are integrated. Since the synthetic segment can ensure high rigidity, the lining thickness can be made thinner than that of a steel segment or a reinforced concrete segment.
For example, as shown in Patent Literature 2, the segments may be joined by fitting an insertion fitting provided on the joint plate of one segment into a receiving fitting provided on the joint plate of the other segment. is there.

  In recent years, construction of large-section tunnels has been planned on soft ground with small earth covering. In the low earth covering tunnel, a side load larger than the vertical load acts on the tunnel, so that the segment ring is crushed vertically. When the seismic force acts on the tunnel in such a state, a large tensile force acts on the joint hardware of the inter-segment joint. Therefore, in a low earth covering tunnel, it is necessary to employ a member having a high tensile strength with respect to the joint hardware of the inter-segment joint.

Even in the case of a low earth covering tunnel inter-segment joint, even if the joint hardware has sufficient strength, the tide arch formed at the end of the segment (inter-segment joint) will protrude outward. Works. This is due to the tensile force acting on the joint hardware arranged at the center of the tide arch. Therefore, in a low earth covering tunnel, it is necessary to prevent damage (such as cracks in the concrete portion) in the inter-segment joint by increasing the strength of the concrete and the specifications of the joint plate with respect to the inter-segment joint.
Here, the tie arch is defined by the concrete placed in the space surrounded by the joint plate, main girder, and skin plate so that the joint metal is wound up with the width from the joint plate to the base end of the joint hardware as the beam height. It is the formed virtual beam member.

JP 2011-012495 A JP 2010-242416 A

Changing the specifications of the joint plate and the strength of the concrete for each segment in accordance with the distribution of stress acting on the segment ring may lead to a deterioration in efficiency during segment manufacture.
On the other hand, increasing the concrete strength and the specifications of the joint plate for all the segments leads to an increase in the construction cost of the entire tunnel.
From this point of view, the present invention proposes a joint structure for a segment that can increase the strength of the joint between segments with a relatively simple structure, and thus can reduce the labor and cost of manufacturing. Let it be an issue.

The joint structure of the segment of the present invention for solving the above problems includes a pair of main girders provided at both ends in the tunnel axial direction, a joint plate provided at the ends of the pair of main girders, and a natural ground. A facing skin plate, a fitting hardware provided on the joint plate, a concrete portion filled in a space surrounded by the main girder, the joint plate and the skin plate, and an inner side of the joint hardware And a reinforcing member for connecting the pair of main girders and the joint plate.
According to this segment, since the joint plate is connected to the main beam via the reinforcing member, deformation of the joint plate can be suppressed. That is, this invention suppresses a deformation | transformation of a joint board by transmitting the tensile force which acted on the joint board via the joint metal fitting to a main girder via a reinforcement member.
As described above, according to the present invention, the joint portion can be reinforced with respect to the segment provided in the portion requiring reinforcement without changing the strength of the concrete or the specification of the joint plate. Therefore, the manufacturing cost of the segment can be suppressed.

If the reinforcing member is provided with a horizontal plate that covers the inner space side of the base end portion of the joint hardware, it is possible to suppress the concrete from protruding to the inner space side, and the strength of the joint between segments can be further increased. Can be improved.
In addition, if the said reinforcement member is provided with a pair of horizontal board which connects the edge part of each said main girder, and the said joint board, it will transmit the action stress to a joint board to a main girder by simpler structure. be able to. The pair of horizontal plates may be inclined with respect to the joint plate. Further, if the reinforcing member is provided with a main girder connecting member horizontally mounted on the pair of main girders on the inner space side of the base end portion of the joint hardware, the concrete protrudes to the inner space side. Since it can suppress more, the proof stress of the joint between segments can be improved more.
If the reinforcing member is provided with a vertical plate that connects the joint plate, the skin plate, and the horizontal plate, it suppresses the protrusion of concrete into the inner space of the tunnel, and consequently, the joint portion between segments. Can be effectively suppressed.
In addition, if it has the grid | lattice-like reinforcing bar arranged in the inner space side of the main girder, and the refractory allowance concrete which winds up the said grid-like reinforcing bar, the fireproof performance of a segment will improve.

  According to the joint structure of a segment of the present invention, it is possible to increase the strength of the joint between segments with a relatively simple configuration, and to reduce the labor and cost of construction.

It is a perspective view which shows the segment which concerns on 1st embodiment. (A) is the YY arrow directional view of FIG. 1, (b) is the XX arrow directional view. (A) is a top view which wants the joint part of the same segment from an inner space side, (b) is a cross-sectional view of (a). It is a cross-sectional view showing a vertical plate. It is a schematic diagram of the tide arch formed in the joint part of a segment. It is a top view which shows a part of segment which concerns on 2nd embodiment. It is a joint part of the segment which concerns on 3rd embodiment, Comprising: (a) is a top view desired from the inner space side, (b) is a cross-sectional view of (a), (c) is a front view desired from the rear end side It is. It is a joint part of the segment which concerns on 4th embodiment, Comprising: (a) is a top view desired from an inner space side, (b) is a cross-sectional view of (a). It is a front view of the receiving material of a joint part. It is a top view which shows a part of segment which concerns on another form.

<First embodiment>
In the embodiment of the present invention, as shown in FIG. 1, a concrete-integrated steel segment (hereinafter referred to as “Segment 1” at the end) composed of a steel shell 2 and a concrete portion 3 placed in the steel shell 2. Will be described.
The segment 1 is formed in a plate shape curved in an arc shape, and a segment ring (not shown) is formed by connecting a plurality of segments in the circumferential direction. When the segment rings are sequentially joined in the axial direction, a tunnel lining is formed.
The steel shell 2 includes a pair of main girders 4, 4, a pair of joint plates 5, 5, a skin plate 6, joint hardware 7, 7, a reinforcing member 8, and a plurality of shape holding members 9, 9,. And is configured.

The pair of main girders 4 and 4 are provided at both ends of the segment 1 in the tunnel axis direction.
As shown in FIG. 2A, the main girder 4 is made of a steel member formed in an arc shape according to the cross-sectional shape of the tunnel.
The main girder 4 of this embodiment is provided with the web 41 and the flanges 42 and 42 each provided in the natural mountain side edge part and the tunnel inner side edge part of the web 41, as shown in FIG.2 (b). Yes. That is, the main girder 4 of the present embodiment has a U-shaped cross-sectional view due to the web 41 and the pair of flanges 42 and 42. Note that the configuration of the main beam 4 is not limited, and is not necessarily U-shaped in cross-sectional view.
As shown in FIG. 1, the main girder 4 is formed with a plurality of inter-ring joints 11, 11,. The inter-ring joint 11 connects the segment rings. In addition, the structure, arrangement | positioning, and number of the joints 11 between rings are not limited, What is necessary is just to set suitably.

The pair of joint plates 5 and 5 are provided at both ends of the segment 1 in the tunnel circumferential direction as shown in FIG. 1 and FIG. The joint plate 5 is made of a rectangular steel plate and is horizontally mounted on the ends of the pair of main girders 4 and 4.
Two through holes 51, 51 for installing the joint hardware 7 are formed in the joint plate 5. The through holes 51 and 51 are formed so that the distance from the center line in the tunnel axis direction of the joint plate 5 is equal. In addition, what is necessary is just to set suitably the shape, the number, and arrangement | positioning of the through-hole 51 according to the position and form of the coupling metal object 7. FIG.

The skin plate 6 is a member facing a natural ground, and covers the end face of the segment 1 on the natural ground side, as shown in FIGS.
The skin plate 6 is a steel plate arranged so as to close the outer peripheral surface side (natural ground side) of the openings of the main girders 4 and 4 and the joint plates 5 and 5 assembled in a frame shape.

The joint hardware 7, 7 is a member for connecting the segments 1 to each other, and is provided on the joint plate 5. As shown to Fig.3 (a), in this embodiment, the receiving metal 71 and the insertion metal 72 are arranged in parallel. The joint plate 5 may be provided with only one of the receiving hardware 71 and the insertion hardware 72. The segments 1 are connected to each other by engaging an insertion hardware 72 protruding from the end face of one segment 1 with a receiving hardware 71 formed on the end face of the other segment 1.
The receiving hardware 71 is opened at the end face of the segment 1 and has a receiving portion 71a into which the inserting hardware 72 can be inserted, and a prismatic shape formed on the back side of the receiving portion 71a (the side opposite to the joint plate 5). The fixing unit 71b and a fixing plate 71c formed at the base end (the end opposite to the joint plate 5) of the fixing unit 71b. The cross-sectional shape of the fixing plate 71c is larger than the cross-sectional shape of the fixing portion 71b. The metal receiver 71 is embedded in the concrete portion 3 in the steel shell 2.

The insertion hardware 72 includes an insertion portion 72a protruding from the joint plate 5 toward the other segment 1, a fixing portion 72b disposed in the steel shell 2, and a base end portion of the fixing portion 72b (the side opposite to the joint plate 5). And a fixing plate 72c formed at the end portion. The cross-sectional shape of the fixing plate 72c is larger than the cross-sectional shape of the fixing portion 72b. The fixing portion 72 b and the fixing plate 72 c are embedded in the concrete portion 3 in the steel shell 2.
The receiving hardware 71 and the insertion hardware 72 are disposed at the same interval from the center of the segment 1 in the tunnel axis direction. Moreover, although the joint metal object 7 of this embodiment is formed in the thickness direction center vicinity of the steel shell 2, as shown in FIG. 1, the formation location of the joint metal object 7 is not limited. Further, the joint hardware 7 may be formed in a plurality of stages. Further, when a sufficient fixing force can be secured by the fixing units 71b and 72b, the fixing plates 71c and 72c may be omitted. Furthermore, the joint structure (configuration of the joint hardware 7) for joining the segments 1 to each other is not limited.

  As shown in FIGS. 3A and 3B, the reinforcing member 8 is a member that connects the pair of main girders 4 and 4 and one joint plate 5 on the inner space side of the joint hardware 7. The reinforcing member 8 of this embodiment is a horizontal plate 81 parallel to the skin plate 6. The horizontal plate 81 of the present embodiment is made of a rectangular flat steel plate, and three sides are fixed to the pair of main girders 4 and 4 and the joint plate 5. Although the fixing method of the horizontal plate 81 is not limited, for example, it may be welded. The width of the horizontal plate 81 (the length in the circumferential direction of the tunnel) is approximately the same as the length of the joint hardware 7 in the steel shell 2, and is from the base end (fixing plates 71 c and 72 c) of the joint hardware 7 to the joint plate 5. In the range, the inner side of the joint hardware 7 is covered. In addition, the material which comprises the horizontal plate 81 is not limited to a steel plate. Further, the horizontal plate 81 is not limited to a flat plate, and may be, for example, a perforated plate or a lattice plate. Moreover, the width | variety of the horizontal plate 81 is not limited, What is necessary is just to have a width | variety of the extent which covers the inner space side of the base end part of the joint metal fitting 7 at least.

  As shown in FIG. 3, the horizontal plate 81 has openings 81a, 81a, 81b formed at both corners on the side of the joint plate 5 and at the center. The openings 81a and 81a formed in the corners of the horizontal plate 81 are rectangular and have a size that allows the vibrator to be inserted when placing concrete. The shape of the opening 81a is not limited to a rectangle, and may be, for example, a circle. The opening 81b formed in the center is rectangular. The shape of the opening 81b is not limited, and may be, for example, a circle. The openings 81a and 81b are formed at positions that do not overlap with the joint hardware 7 and 7 in plan view. The openings 81a and 81b may be formed as necessary, and the arrangement and number of the openings 81a and 81b may be appropriately determined.

  The reinforcing member 8 of this embodiment includes a vertical plate 82. As shown in FIG. 4, the vertical plate 82 connects the joint plate 5, the skin plate 6, and the horizontal plate 81. The vertical plate 82 of the present embodiment is made of a flat steel plate, and is erected on the skin plate 6 so as to be orthogonal to the skin plate 6 and the horizontal plate 81. Three sides of the vertical plate 82 are welded to the joint plate 5, the skin plate 6, or the horizontal plate 81. In the vertical plate 82, an opening 82a is formed corresponding to the position of the opening 81b of the horizontal plate 81 so that the concrete portion 3 is not divided. The opening 82a may be formed as necessary. The material constituting the vertical plate 82 is not limited to a steel plate. Further, the vertical plate 82 is not limited to a flat plate, and may be, for example, a perforated plate or a lattice plate. Further, the vertical plate 82 may be installed as necessary and may be omitted.

As shown in FIGS. 2 (a) and 2 (b), the shape retaining members 9, 9,... Are spaced apart from the inner spaces of the main girders 4, 4 and the joint plates 5, 5 assembled in a frame shape. Has been placed. The shape retaining material 9 is laid across the main girders 4 so as to be perpendicular to the skin plate 6.
The shape retaining member 9 is made of a steel plate, and the end surface on the natural mountain side is in contact with the skin plate 6, and both ends in the tunnel axial direction are in contact with the plate surfaces of the main girders 4 and 4, respectively. The shape retaining member 9 is welded at the contact point with the skin plate 6 and the end is welded to the web 41 and the flange 42. In addition, the fixing method of the shape holding material 9 is not limited.

  The concrete part 3 is a hardened body of concrete filled in a space surrounded by a pair of main girders 4, 4, a pair of joint plates 5, 5 and a skin plate 6. As shown in FIG. 1, the concrete portion 3 includes a fire-resistant concrete 31 formed with a predetermined thickness on the inner surface side of the segment 1, and an internal concrete 32 formed inside the steel shell 2. Yes. In addition, what is necessary is just to set the mixing | blending of the concrete (fresh concrete) which comprises the concrete part 3 suitably.

  A grid-like reinforcing bar 33 is embedded in the fireproof concrete 31 as a reinforcing material. In the present embodiment, a reinforcing bar network in which a plurality of reinforcing bars are assembled in a grid shape is adopted as the grid-like reinforcing bar 33. However, the grid-like reinforcing bar 33 is not necessarily a net, and vertical and horizontal bars are appropriately arranged. May be. Further, reinforcing bars may also be arranged in the internal concrete 32 (in the steel shell 2). Moreover, you may employ | adopt the reinforcing bar rod which combined the grid | lattice-like reinforcing bar 33 of the fire-resistant concrete 31 and the reinforcing bar of the internal concrete 32 as a reinforcing material.

According to the joint structure of the segment 1 of the present embodiment, since the joint plate 5 is connected to the main girder 4 via the reinforcing member 8, deformation of the joint plate 5 can be suppressed. That is, the tensile force acting on the joint plate 5 via the joint hardware 7, 7 is transmitted to the main girders 4, 4 via the reinforcing member 8, thereby suppressing deformation of the joint plate 5.
Since the reinforcing member 8 covers the range from the base end of the joint hardware 7, 7 to the joint plate 5, the concrete part 3 can be prevented from protruding to the inner space side, and thus more inter-segment joint. The proof stress can be improved. As shown in FIG. 5, the tide arch formed in the joint portion at the end of the segment 1 generates a shearing force due to the tensile force acting through the joint hardware 7, but the joint portion is reinforced by the horizontal plate 81. Therefore, the concrete portion 3 is prevented from being damaged in the tide arch.

Since the reinforcement of the segment 1 is completed by fixing the reinforcing member 8, a highly proof segment can be easily manufactured. Moreover, the reinforcement member 8 can be provided only with respect to the segment 1 provided in the part which needs reinforcement, and the joint part (intersegment joint part) can be reinforced. Therefore, the manufacturing cost can be reduced as compared with the case where a special segment is manufactured in advance. Moreover, since the horizontal plate 81 and the vertical plate 82 are easily available steel plates, they are inexpensive.
By forming the openings 81a and 81b in the horizontal plate 81, the amount of steel material can be reduced. In addition, by inserting a vibrator through the openings 81a and 81b, the cast concrete cast into the steel shell 2 can be compacted.
Since the vertical plate 82 is disposed, the deformation of the horizontal plate 81 is suppressed. Therefore, it is prevented that the concrete part 3 protrudes into the inner space of the tunnel, and as a result, deformation at the joint portion between segments can be effectively suppressed.
Moreover, since the fire-resistant concrete 31 is provided in the inner space side of the main girder 4, the fire resistance performance of the segment 1 is high.

<Second Embodiment>
In the second embodiment, as in the first embodiment, a pair of main girders 4, 4, a pair of joint plates 5, 5, a skin plate 6, joint hardware 7, 7, and a reinforcing member 8 , A concrete-integrated steel segment (hereinafter referred to as “Segment 1” at the end) and a steel shell 2 provided with a plurality of shape-retaining materials 9, 9,... And a concrete portion 3 placed in the steel shell 2. Will be described.
In addition, since the details of the concrete part 3, the main girder 4, the joint plate 5, the skin plate 6, the joint hardware 7 and the shape retaining material 9 of the second embodiment are the same as the contents shown in the first embodiment, Detailed description is omitted.

As shown in FIG. 6, the reinforcing member 8 is a member that connects the pair of main girders 4, 4 and one joint plate 5 on the inner space side than the joint hardware 7. The reinforcing member 8 of this embodiment includes a pair of horizontal plates 81 and 81 that connect the end portions of the main girders 4 and the joint plate 5, and a main girder connecting member 83 that is horizontally mounted on the pair of main girders 4 and 4. And.
The horizontal plate 81 is a flat steel plate parallel to the skin plate 6 and is disposed in an inclined state with respect to the joint plate 5. One end of the horizontal plate 81 is welded to the central portion of the joint plate 5, and the other end of the horizontal plate 81 is welded to the flange 41 at the corner between the main girder 4 and the middle girder connecting member 83. The method for fixing the horizontal plate 81 is not limited. Moreover, the material which comprises the horizontal plate 81 is not limited to a steel plate.
The main girder connecting member 83 is a flat steel plate parallel to the skin plate 6, and is disposed on the inner space side of the base end portion of the joint hardware 7. Both ends of the main girder connecting member 83 are welded to the flange 41 of each main girder 4. In addition, the fixing method of the main girder connection material 83 is not limited. Moreover, the material which comprises the main girder connection material 83 is not limited to a steel plate, For example, a steel bar may be sufficient. The main girder connecting member 83 may be installed as necessary and may be omitted.

According to the joint structure of the segment 1 of the present embodiment, since the joint plate 5 is connected to the main girder 4 via the reinforcing member 8, deformation of the joint plate 5 can be suppressed. That is, the deformation of the joint plate 5 is suppressed by transmitting the tensile force acting on the joint plate 5 via the joint hardware 7, 7 to the main girders 4, 4 via the pair of lateral plates 81, 81. Since the main girder connecting member 83 is provided at the joint between the horizontal plate 81 and the main beam 4, the main beam 4 is prevented from being deformed by the tensile force transmitted through the horizontal plate 81. .
Since the horizontal plates 81 and 81 are arranged so as to intersect with the shearing force generated in the tide arch (see FIG. 5) by the tensile force acting on the joint metal members 7 and 7, it is confirmed that the concrete portion 3 is cracked. To prevent.

Since the reinforcement of the segment 1 is completed by fixing the horizontal plate 81 and the main girder connecting member 83, a highly proof segment can be easily manufactured. In addition, the joint portion can be easily reinforced only for the segment 1 provided in the portion where the reinforcement is required. Therefore, the manufacturing cost can be reduced as compared with the case where a special segment is manufactured in advance. Moreover, since the horizontal plate 81 and the main girder connecting member 83 are easily available steel plates, they are inexpensive.
Moreover, since the fire-resistant concrete 31 is provided in the inner space side of the main girder 4, the fire resistance performance of the segment 1 is high.

<Third embodiment>
In the third embodiment, as in the first embodiment, a pair of main girders 4 and 4, a pair of joint plates 5 and 5, a skin plate 6, joint hardware 7 and 7, and a reinforcing member 8 , A concrete-integrated steel segment (hereinafter referred to as “Segment 1” at the end) and a steel shell 2 provided with a plurality of shape-retaining materials 9, 9,... And a concrete portion 3 placed in the steel shell 2. Will be described.
In addition, since the details of the concrete part 3, the main girder 4, the joint plate 5, the skin plate 6, the joint hardware 7 and the shape retaining material 9 of the third embodiment are the same as the contents shown in the first embodiment, Detailed description is omitted.

As shown in FIGS. 7A and 7B, the reinforcing member 8 includes a lateral plate 81 that connects the pair of main girders 4 and 4 and one joint plate 5 on the inner space side of the joint hardware 7, and A restraining member 84 that surrounds the joint hardware 7 is provided.
The horizontal plate 81 is formed of a rectangular flat steel plate parallel to the skin plate 6, and three sides are fixed to the pair of main girders 4 and 4 and the joint plate 5. In addition, since the detail of the other horizontal plate 81 is the same as the content shown in 1st embodiment, detailed description is abbreviate | omitted. Further, the configuration of the reinforcing member 8 is not limited. For example, a pair of horizontal plates 81 and 81 may be disposed so as to connect the end portions of the main girders 4 and the joint plate 5.

  The constraining member 84 of the present embodiment is configured by a plurality of hoop bars 84 a, 84 a,... Arranged in parallel along the axial direction of the joint hardware 7. The hoop bar 84a of this embodiment is formed in a rectangular frame shape by combining a pair of U-shaped reinforcing bars. As shown in FIG. 7C, the hoop bar 84 a has a sufficiently large shape with respect to the fixing plates 71 c and 72 c, and the concrete is filled between the joint hardware 7 and the restraining member 84. It is configured. The hoop bar 84a may be formed by processing one reinforcing bar. Further, the hoop line 84a may be circular, and its shape is not limited. Further, the interval between the hoop lines 84a is not limited and may be set as appropriate. Further, the restraining member 84 is not limited to a structure in which a plurality of hoop bars 84a are continuously provided, and may be a spiral line formed by processing a single reinforcing bar into a spiral shape. Further, the restraining member 84 may be a cylindrical member provided around the fixing portions 71b and 72b of the joint metal piece 7.

  In the present embodiment, as shown in FIG. 7B, a connecting member 85 that connects the restraining member 84 and the fixing plates 71c and 72c is provided. The hoop muscles 84a, 84a,... Are attached to the connecting member 85 via binding wires (not shown). The connecting member 85 of this embodiment is made of an L-shaped reinforcing bar, and the other piece 85b is fixed to the fixing plate 71c so that one piece 85a is parallel to the axial direction (tunnel circumferential direction) of the fixing portions 71b and 72b. , 72c. In the present embodiment, two connecting members 85 are provided for each joint hardware 7. Note that the number and shape of the connecting members 85 are not limited. Further, the method for fixing the connecting member 85 is not limited. In the present embodiment, one piece 85a of the connecting member 85 is disposed above the fixing portions 71b and 72b. However, the one piece 85a is located below or on the side of the fixing portions 71b and 72b. Also good.

According to the joint structure of the segment 1 of the present embodiment, since the joint hardware 7 is surrounded by the restraining member 84, the concrete around the joint hardware 7 is restrained by the restraining member 84. Therefore, even when a large tensile force is applied to the joint hardware 7, cracks are prevented from occurring in the concrete around the joint hardware 7. Since the restraining member 84 is disposed so as to cross a crack (shear surface) around the joint hardware that is expected to be generated by a tensile force acting on the joint hardware 7, the pull-out strength of the joint hardware 7 is improved. be able to. Furthermore, since the restraint member 7 can be installed at the same timing as the reinforcement reinforcement reinforcing bars, it is excellent in workability.
Since the effect of the joint structure of the segment 1 of other 3rd embodiment is the same as the content shown in 1st embodiment, detailed description is abbreviate | omitted.

<Fourth embodiment>
In the fourth embodiment, as in the first embodiment, a pair of main girders 4 and 4, a pair of joint plates 5 and 5, a skin plate 6, joint hardware 7 and 7, and a reinforcing member 8 , A concrete-integrated steel segment (hereinafter referred to as “Segment 1” at the end) and a steel shell 2 provided with a plurality of shape-retaining materials 9, 9,... And a concrete portion 3 placed in the steel shell 2. Will be described.
The details of the concrete part 3, the main girder 4, the joint plate 5, the skin plate 6, and the joint hardware 7 of the fourth embodiment are the same as the contents shown in the first embodiment, and thus detailed description is omitted. To do.

As shown in FIGS. 8A and 8B, the reinforcing member 8 includes a lateral plate 81 that connects the pair of main girders 4 and 4 and one joint plate 5 on the inner space side of the joint hardware 7, and A restraining member 84 that surrounds the joint hardware 7, a receiving material 86, and an anchor material 87 are provided.
The horizontal plate 81 is formed of a rectangular flat steel plate parallel to the skin plate 6, and three sides are fixed to the pair of main girders 4 and 4 and the joint plate 5. The details of the horizontal plate 81 are the same as the contents shown in the third embodiment, and thus detailed description thereof is omitted.
The constraining member 84 includes a plurality of hoop bars 84a, 84a,... Arranged in parallel along the axial direction of the joint hardware 7. Since the details of the restraining member 84 are the same as the contents shown in the third embodiment, the detailed description is omitted. The restraining member 84 may be installed as necessary and may be omitted.

  As shown in FIG. 9, the receiving material 86 of this embodiment is formed in a frame shape by combining a pair of plate materials 86a and 86a. The plate member 86a is formed with a recess 86b into which the fixing portions 71b and 72b can be inserted. The receiving member 86 is formed by abutting the sides of the pair of plate members 86a and 86a on the side where the recess 86b is formed. The pair of plate members 86a and 86a are arranged with the fixing portions 71b and 72b sandwiched from above and below. As shown in FIGS. 8A and 8B, the fixing portions 71b and 72b pass through the openings formed by the recesses 86b and 86b of the pair of plate members 86a and 86a. The opening of the receiving material 86 of this embodiment is formed in the same shape as the cross-sectional shape of the fixing portions 71b and 72b, and the inner surface of the concave portion 86b is in contact with the outer surface of the fixing portions 71b and 72b. The shape of the opening of the receiving member 86 is not limited as long as it can be inserted through the fixing portions 71b and 72b. For example, the receiving member 86 has a larger shape than the receiving member fixing plates 71c and 72c, and has a recess 86b ( A gap may be formed between the opening) and the fitting 7. Further, the receiving material 86 may be locked to the fixing plates 71c and 72c. The receiving material 86 is not necessarily formed by combining a pair (two) of plate materials 86a and 86a. For example, it may be a single frame-shaped plate material. Further, it may be four plate members arranged so as to surround the joint fitting 7 corresponding to the position of the anchor member 87.

Further, a through hole into which the anchor material 87 can be inserted is formed in the plate material 86a. In addition, although the number of the through-holes formed in the board | plate material 86a is not limited, In this embodiment, two places are formed.
One end of the anchor material 87 is fixed to the receiving material 86. The other end of the anchor material 87 is disposed at a position farther from the joint plate 5 than the base end of the joint hardware 7. The anchor material 87 of this embodiment is composed of reinforcing bars. In addition, the material which comprises the anchor material 87 is not limited, For example, a wire, a board | plate material, etc. may be sufficient as steel. The anchor material 87 is fixed to the receiving material 86 by screwing a nut into a head portion inserted through the through hole of the plate material 86a. In addition, the fixing method of the anchor material 87 is not limited, For example, you may weld. Further, a fixing member (such as a fixing plate) may be formed on the other end of the anchor material 87 as necessary. In this embodiment, four anchor members 87, 87,... Are arranged around the joint metal piece 7, but the number, arrangement, and shape of the anchor members 87 are not limited.

  A cutout is formed in the shape retaining member 9 disposed at a position intersecting with the joint metal 7 corresponding to the position of the joint metal 7. In addition, as shown in FIGS. 8A and 8B, a through-hole through which the anchor material 87 can be inserted is formed in the shape retaining material 9 disposed at a position intersecting with the anchor material 87. Note that the shape retaining material 9 disposed at a position intersecting with the anchor material 87 may have a notch corresponding to the position of the anchor material 87 instead of the through hole. Further, the rear end of the anchor material 87 through which the through hole of the shape retaining material 9 is inserted may be fixed (connected) to the shape retaining material 9. Since the details of the other shape retaining material 9 are the same as the contents shown in the first embodiment, the detailed description is omitted.

According to the joint structure of the segment 1 of this embodiment, when the bearing stress is generated in the concrete by the tensile force acting on the joint hardware 7, the bearing stress is received by the receiving material 86 and the anchor material 87. The pull-out strength of 7 can be improved, and as a result, the joint performance can be improved. That is, by transmitting the tensile force acting on the joint hardware 7 to the back of the joint hardware 7 (position away from the joint portion), it is possible to reduce the burden on the joint portion.
Since the effect of the joint structure of the segment 1 which concerns on other 4th embodiment is the same as the content shown in 3rd embodiment, detailed description is abbreviate | omitted.

The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and the above-described components can be appropriately changed without departing from the spirit of the present invention.
The use of segment 1 is not limited, and may be used for construction of shield tunnels and TBMs, for example.
The shape of the horizontal plate 81 is not limited to that shown in each of the above embodiments as long as it connects the main beam 4 and the joint plate 5 so as to be able to transmit force. For example, as shown in FIG. 10, a rectangular or triangular plate material fixed to the corners of the main beam 4 and the joint plate 5 may be used.

DESCRIPTION OF SYMBOLS 1 Segment 2 Steel shell 3 Concrete part 31 Fire-resistant concrete 32 Internal concrete 33 Grid-like reinforcing bar 4 Main girder 5 Joint plate 6 Skin plate 7 Joint metal 8 Reinforcement member 81 Horizontal plate 83 Main girder connecting material 84 Restraint member 86 Receiving member 87 Anchor Material 9 Shape retention material

Claims (7)

A pair of main girders provided at both ends in the tunnel axis direction;
A joint plate provided at the ends of the pair of main girders;
A skin plate facing the natural ground,
A joint fitting provided on the joint plate;
A concrete portion filled in a space surrounded by the main girder, the joint plate and the skin plate;
A joint structure for a segment, comprising: a reinforcing member that connects the pair of main girders and the joint plate closer to the inner space than the joint hardware.   The joint structure of a segment according to claim 1, wherein the reinforcing member includes a horizontal plate that covers an inner space side of a base end portion of the joint hardware.   The segment joint structure according to claim 1, wherein the reinforcing member includes a pair of lateral plates that connect the end portions of the main girders and the joint plate.   The segment joint structure according to claim 3, wherein the pair of lateral plates are inclined with respect to the joint plate.   The said reinforcing member is equipped with the main girder connection material horizontally mounted by the said pair of main girder in the inner space side of the base end part of the said joint metal fitting, The Claim 3 or Claim 4 characterized by the above-mentioned. The joint structure of the described segment.   The segment according to any one of claims 2 to 5, wherein the reinforcing member includes a vertical plate that connects the joint plate, the skin plate, and the horizontal plate. Joint structure. A grid-like reinforcing bar arranged on the inner side of the main beam;
The segment joint structure according to any one of claims 1 to 6, further comprising a fire-resistant concrete in which the lattice reinforcing bars are wound.

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