JP2015078533A - Composite segment and producing method of composite segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide composite segment and a producing method of composite segment capable of maintaining a predetermined resistance even in a case where earth-water pressure is subjected thereto from bank side.SOLUTION: The composite segment comprises: a pair of main girders 2, 2 which is arranged with a predetermined interval in tunnel axis direction D and extending in tunnel circumferential direction C; joint plates 3, 3 which are connected with both end parts of the pair of main girders 2, 2 in tunnel circumferential direction C in a bridging manner between the pair of main girders 2, 2; a skin plate 4 connected with the main girders 2, 2 and the joint plates 3, 3 at outer side in tunnel radial direction; and concrete 6 injected into inner section of a steel shell 5 consisting of the pair of main girders 2, 2, joint plates 3, 3 and the skin plate 4. In an inner section in the concrete 6, arranged are: at inside in tunnel radial direction E, a plurality of first main steel lines 7, 7 which extends in tunnel circumferential direction C and being arranged with a predetermined interval in tunnel axis direction D; a hoop line 9 surrounding the first main steel lines 7, 7; and a fixing member 10 which is connected with the skin plate 4 and on which the hoop line 9 is fixed.

Description

  The present invention relates to a synthetic segment manufactured by filling concrete in a steel arc-shaped frame (steel shell) and a method for manufacturing the synthetic segment.

Conventionally, in a shield method of forming a tunnel by excavating a drill hole in a natural ground and building a cylindrical wall body by connecting a plurality of arc-shaped segments on the inner surface in the tunnel circumferential direction and tunnel axial direction, A synthetic segment manufactured by filling concrete in a steel circular arc frame (steel shell) is known.
In such a synthetic segment, corrosion of the steel member is prevented by filling the inside of the steel shell with concrete. Moreover, when the concrete of the composite segment is exposed to the inner space, the inner surface can be smoothly formed, and the friction loss of the flow body in the tunnel can be reduced.
A synthetic segment is also known in which an arc-shaped main reinforcing bar extending in the circumferential direction of the tunnel is arranged on the inner space side in the concrete so as to increase the bending strength (for example, see Patent Document 1).

JP-A-8-277698

Here, when soil water pressure acts from the ground side in the tunnel, a compressive force in the circumferential direction of the tunnel acts on the ground side in the composite segment, and a tensile force in the circumferential direction of the tunnel acts on the inner space side. Then, the component force (abdominal pressure) in the tunnel radial direction of this tensile force acts toward the inner side in the tunnel radial direction with respect to the main reinforcing bar, so that the arc-shaped main reinforcing bar deforms linearly and becomes a cover on the inner side. There is a risk that the concrete will be peeled off, causing a sudden decrease in yield strength.
Also, the component force in the tunnel radial direction of the compressive force acting on the natural ground side acts on the skin plate (steel plate on the natural mountain side of the steel shell) toward the outer side in the tunnel radial direction, so the skin plate may be deformed out of plane. There is.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a synthetic segment and a synthetic segment manufacturing method capable of maintaining a predetermined yield strength even when soil water pressure is applied from the natural ground side. And

  In order to achieve the above object, the composite segment according to the present invention is an arc-shaped composite segment that is connected in the tunnel circumferential direction and the tunnel axial direction along the inner wall of the excavation hole to form a tunnel. A pair of main girders arranged at a predetermined interval and extending in the circumferential direction of the tunnel, and a joint joined so as to pass between the pair of main girders at both ends of the pair of main girders in the tunnel circumferential direction A plate, a skin plate joined to the outer side in the tunnel radial direction of the main girder and the joint plate, and concrete filled in a steel shell formed by the pair of main girder, the joint plate and the skin plate, The concrete includes a plurality of first main bodies extending inwardly in the tunnel radial direction in the tunnel radial direction and arranged at predetermined intervals in the tunnel axial direction. And muscle, to a hoop which surrounds the first main reinforcing bars, and fixing member to which the hoop while being joined to the skin plate is fixed, characterized in that is provided.

  The synthetic segment manufacturing method according to the present invention is a synthetic segment manufacturing method for manufacturing the synthetic segment, and passes between the pair of main girders to both ends of the pair of main girders in the tunnel circumferential direction. A steel shell forming step of joining the joint plate and joining the skin plate to the ground side of the tunnel of the pair of main girders and the joint plate; and a fixing member on the skin plate. A fixing member joining step for joining, a reinforcing step for arranging the plurality of first main reinforcing bars and hoops in the steel shell, a hoop reinforcement fixing step for fixing the hoops to the fixing member, and the steel A concrete filling step of filling the inside of the shell with the concrete.

In the present invention, the first main reinforcing bar is surrounded by the hoop bars, and the hoop bars are fixed to the fixing member joined to the skin plate, whereby the first main reinforcing bar and the skin plate are connected to each other. Become.
When earth and water pressure acts on the tunnel from the natural ground side, a compressive force in the circumferential direction of the tunnel acts on the synthetic segment, and a tensile force in the circumferential direction of the tunnel acts on the inner space side. Normally, the first main rebar tends to be linear due to the tensile force in the tunnel radial direction (abdominal pressure), and the skin plate tends to deform in the out-of-plane direction due to the compressive force in the tunnel radial direction. However, in the present invention, since the first main reinforcing bar and the skin plate are connected, the component forces on the opposite side of the tunnel radial direction acting on each of the first main reinforcing bar and the skin plate are offset, and the deformation and displacement of the first main reinforcing bar and the skin plate are canceled. Can be prevented.
As a result, the composite segment will not be deformed, such as the first main rebar being deformed / displaced, the cover concrete will peel off, or the adhesive split will break, so the composite segment can always be held at a predetermined strength. it can.
Furthermore, by preventing the deformation of the skin plate, the effective width of the skin plate, which is 25 times the skin plate thickness generally used in the design, can be further increased, and an economical design becomes possible.

  Moreover, in the synthetic segment according to the present invention, the fixing member may be composed of a stud gibber with a head, a T-shaped steel, an L-shaped steel, a C-shaped steel, or a J-shaped steel material.

By doing in this way, the fixing member can fix the hoop muscle reliably, and can connect the 1st main reinforcement and the skin plate reliably.
Further, as the fixing member, a member that is normally distributed can be used without using a special member.

  Further, in the composite segment according to the present invention, the fixing member and the skin plate are welded, and the fixing member and the hoop are welded, or in a hole formed in the fixing member. It is preferable that the hoop line is inserted or the hoop line is hung on a protrusion formed on the fixing member.

  By doing so, the fixing member and the skin plate are securely and firmly joined together, and the fixing member and the hoop muscle are securely and firmly joined. Can be physically constrained and securely and firmly connected.

  In the composite segment according to the present invention, a plurality of the fixing members are arranged at predetermined intervals in both or one of the tunnel circumferential direction and the tunnel axis direction, and the tunnel circumferential direction and the tunnel axis direction are arranged. It is preferable that the imaginary cone breaking surfaces of the fixing members adjacent to both or one of them are continuous.

When the fixing member breaks the concrete and comes out in the tunnel radial direction, the cone is broken. When the cone is broken, a cone breaking surface is generated. In the present invention, a virtual cone destruction surface is defined as a cone destruction surface when it is assumed that the cone has been destroyed.
Then, since the virtual cone fracture surfaces by the fixing members are continuous without excess or deficiency, a stiffening region in which the virtual cone fracture surfaces are efficiently connected is formed. The stiffening region of the composite segment can be easily formed. This stiffening region can surely resist the stress transmitted to the tunnel circumferential direction and / or the tunnel axial direction, so that when soil water pressure acts on the tunnel from the ground, And the skin plate can be prevented from separating.

  In the composite segment according to the present invention, the hoop bars may surround the plurality of first main reinforcing bars one by one and be fixed to the fixing member one by one.

  By doing so, the first main reinforcing bar and the skin plate are reliably connected via the hoop bar and the fixing member, so that the deformation and displacement of the first main reinforcing bar and the skin plate can be reliably prevented. .

  Further, in the composite segment according to the present invention, a plurality of second main reinforcing bars extending in the tunnel circumferential direction outside the first main reinforcing bar in the tunnel radial direction are predetermined in the tunnel axial direction inside the concrete. The plurality of second main reinforcing bars may be surrounded by the hoop bars together with the first main reinforcing bars.

By doing in this way, the yield strength of a synthetic segment can be increased.
Moreover, since it can be set as the structure which cancels the component force of the tunnel radial direction which acts on each of a skin plate, a 1st main reinforcing bar, and a 2nd main reinforcing bar, the component force of a tunnel radial direction is only with a skin plate and a 1st main reinforcing bar. Compared with the configuration that cancels out, the component force in the tunnel radial direction can be canceled out reliably, and deformation and displacement of the skin plate and the first main reinforcing bar can be surely prevented.

  In the composite segment according to the present invention, a substantially triangular plate-like shape is formed inside the concrete, and the end surface thereof is connected to the main girder and the skin plate, respectively, with the out-of-plane direction being the tunnel circumferential direction. It is preferable that one or more connected members are provided at predetermined intervals in the circumferential direction of the tunnel.

  By doing so, the skin plate and the main girder are securely coupled by the coupling member, and the out-of-plane force acting on the skin plate can be transmitted to the main girder via the coupling member. Can increase the buckling strength.

  According to the present invention, the composite segment is not deformed, such as the first main rebar is deformed / displaced, the cover concrete is peeled off, or the adhesive split is broken, so the composite segment is always maintained at a predetermined strength. can do.

It is a figure which shows an example inside the steel shell of the synthetic | combination segment by 1st Embodiment of this invention. (A) is the sectional view on the AA line of FIG. 1, (b) is the sectional view on the BB line of FIG. It is a figure explaining the virtual cone destruction surface by a fixing member. It is a figure explaining the synthetic segment by 2nd Embodiment. It is a figure explaining the synthetic segment by 3rd Embodiment. It is a figure explaining the virtual cone destruction surface by the fixing member of 3rd Embodiment. It is a figure explaining the synthetic segment by 4th Embodiment. It is a figure explaining the synthetic segment by 5th Embodiment.

(First embodiment)
Hereinafter, a synthetic segment and a method for manufacturing the synthetic segment according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3.
The synthetic segment 1A according to the first embodiment shown in FIG. 1 and FIG. 2 is, for example, in the circumferential direction of the tunnel (indicated by the arrow C in the figure) along the inner wall of the tunnel excavated hole in the natural ground F in the shield method. Direction) and the axial direction of the tunnel (the direction of the arrow D in the figure, the same as the width direction of the composite segment 1A) are connected to form a cylindrical wall body. The composite segment 1A is formed in an arc plate shape having a radius of curvature substantially equal to the radius of curvature of the inner surface of the tunnel excavation hole.

As shown in FIG. 2, the composite segment 1A includes a pair of main girders 2 and 2 respectively disposed at both ends in the tunnel axis direction D of the composite segment 1A, and a pair of main girders 2 and 2 in the tunnel circumferential direction C. A pair of joint plates 3, 3 respectively joined to both ends, and arcuate skin plates 4 of the main girders 2, 2 and the joint plates 3, 3 joined to the natural ground F side of the tunnel. A concrete 6 is filled in the steel shell 5 of the arcuate plate frame.
In the concrete 6, a plurality of first main reinforcing bars 7, 7... Extending in an arc shape in the tunnel circumferential direction C are arranged on the inner sky G side, and extend in the tunnel circumferential direction C on the natural ground F side. A plurality of second main reinforcing bars 8, 8... Are arranged. The plurality of first main reinforcing bars 7, 7... And the second main reinforcing bars 8, 8... Are surrounded by a predetermined number of hoop bars 9, and the hoop bars 9 are fixed to the skin plate 4. It is fixed on the member 10.

The plurality of first main reinforcing bars 7, 7... And the second main reinforcing bars 8, 8,... Are formed of, for example, deformed reinforcing bars and the like in the tunnel axis direction D of the concrete 6 portion with a predetermined interval in the tunnel axis direction D. Almost evenly arranged over the entire length.
In the first embodiment, the first main reinforcing bar 7 and the second main reinforcing bar 8 are set to have the same number. Further, the arranged first main reinforcing bars 7, 7... And second main reinforcing bars 8, 8,... Are arranged at positions overlapping in the radial direction of the tunnel (the direction of arrow E in the drawing).

The hoop bars 9 are formed by bending, for example, round steel or the like so as to form a substantially square hoop shape when viewed from the tunnel circumferential direction C.
Of all the first main reinforcing bars 7, 7, ... and the second main reinforcing bars 8, 8, ..., a plurality of first main reinforcing bars 7, 7 ... arranged in the tunnel axis direction D and a plurality of second main reinforcing bars Reinforcing bars 8, 8... Are arranged inside the hoop bars 9, and the plurality of first main reinforcing bars 7, 7,... And the plurality of second main reinforcing bars 8, 8,. Has been.

The fixing member 10 is configured by a headed stud divel, and a plurality of fixing members 10 are arranged at predetermined intervals in the tunnel circumferential direction C and the tunnel axial direction D. As shown in FIG. 2B, the interval between the fixing members 10 and 10 adjacent in the tunnel circumferential direction C is set to be substantially the same as the interval between the hoop lines 9 adjacent in the tunnel circumferential direction C.
In the fixing member 10, the leg portion 10 a of the headed stud dowel is welded to the inner space G side of the skin plate 4, and the head portion 10 b is joined to the hoop muscle 9.
The fixing member 10 and the hoop bar 9 are joined by, for example, welding or binding with a binding wire.
Further, the fixing member 10 and the hoop muscle 9 are such that the hoop muscle 9 is inserted into the hole formed in the fixing member 10 or the hoop muscle 9 is hung on the protruding portion provided in the fixing member 10. It may be joined.
As a result, the hoop bar 9 is fixed to the fixing member 10, and the first main reinforcing bar 7, the second main reinforcing bar 8, and the skin plate 4 are connected via the hoop bar 9 and the fixing member 10.

Here, the stress which acts on the synthetic segment 1A when soil water pressure acts from the natural ground F side in the tunnel will be described.
When earth and water pressure acts from the natural ground F side in the tunnel, a compressive force in the tunnel circumferential direction C acts on the natural mountain F side in the composite segment 1A, and a tensile force in the tunnel circumferential direction C acts on the inner sky G side. The component force (abdominal pressure) in the tunnel radial direction E of the tensile force acts toward the inside of the tunnel radial direction E with respect to the first main reinforcing bar 7, and the arc-shaped first main reinforcing bar 7 is in the tunnel circumferential direction C. The central part of is displaced toward the inner space G and tends to be linear.

Further, the component force of the compressive force in the tunnel radial direction E acts toward the outer side of the tunnel radial direction E with respect to the skin plate 4, and the skin plate 4 protrudes toward the natural mountain F side at the center in the tunnel circumferential direction C. Try to deform out of plane.
When the skin plate 4 is about to be deformed out of the plane, the head 10b of the fixing member 10 joined to the skin plate 4 supports the concrete 6 in an attempt to displace to the natural ground F side. Therefore, as shown in FIG. 3, a virtual cone breaking surface 61 is formed from the head 10 b of each fixing member 10 to the concrete 6 on the natural ground F side.
In the first embodiment, the arrangement of the fixing member 10 is set so that the cone breaking surfaces 61, 61... Of the fixing members 10, 10... Adjacent in the tunnel circumferential direction C and the tunnel axial direction D are continuous. .

Then, the manufacturing method of 1 A of synthetic segments by 1st Embodiment mentioned above is demonstrated.
First, joint plates 3 and 3 are joined to both ends of the pair of main girders 2 and 2 shown in FIG. 2 so as to pass between the pair of main girders 2 and 2, respectively. The skin plate 4 is joined to the natural ground F side of the 2 and the pair of joint plates 3 and 3 to form the steel shell 5 (steel shell forming step).
Subsequently, the fixing member 10 is bonded to the skin plate 4 (fixing member bonding step). At this time, the leg portion 10 a of the fixing member 10 is welded to the skin plate 4.

Subsequently, the first main reinforcing bars 7, 7..., The second main reinforcing bars 8, 8... And the hoop bars 9, 9.
Subsequently, the hoop line 9 and the fixing member 10 are joined (hoop line fixing step).
Subsequently, concrete 6 is filled into the steel shell 5 (concrete filling step).
And the synthetic segment 1A is manufactured because the concrete 6 hardens | cures and it becomes predetermined intensity | strength.
The fixing member 10 is joined to the skin plate 4 in advance, and the skin plate 4 to which the fixing member 10 is joined is joined to the pair of main girders 2 and 2 and the pair of joint plates 3 and 3 to form the steel shell 5. It may be formed.

Next, operations and effects of the composite segment 1A according to the first embodiment described above will be described with reference to FIGS.
According to the composite segment 1A according to the first embodiment, since the skin plate 4 and the first main reinforcing bars 7, 7... Are connected via the hoop bars 9 and the fixing member 10, the tunnel diameter of the compression force described above. The component force in the direction E and the component force in the tunnel radial direction E of the tensile force are offset, and deformation and displacement of the skin plate 4 and the first main reinforcing bars 7, 7.
Here, if the skin plate 4 and the first main reinforcing bars 7, 7... Are not connected, the skin plate 4 has a center portion in the tunnel circumferential direction C due to a component force in the tunnel radial direction E of the compressive force. The first main reinforcing bars 7, 7... Are deformed out of the plane so as to protrude to the side, and the central portion in the tunnel circumferential direction C is the inner space G due to the component force in the tunnel radial direction E of the tensile force. However, in the first embodiment, there is a possibility that the covering concrete on the surface of the inner air G side of the concrete 6 peels off or breaks and adheres. It is possible to prevent an unforeseen situation from occurring, and it is possible to maintain the yield strength of the synthetic segment 1A even when soil water pressure is applied from the natural ground F side.

  In the first embodiment, since the second main reinforcing bars 8 are provided on the natural ground F side in the composite segment 1A, the second main reinforcing steel 8 is applied when soil water pressure is applied from the natural ground F side. , 8 also has a component force in the tunnel radial direction E outward direction of the compressive force. The first main reinforcing bars 7, 7... And the second main reinforcing bars 8, 8... Are surrounded by the hoop bars 9, so that the compressive force acting on the second main reinforcing bars 8, 8. The component force in the direction cancels the component force in the tunnel radial direction E inside direction of the tensile force acting on the first main reinforcing bars 7, 7... Together with the component force in the tunnel radial direction E outside direction of the compressive force acting on the skin plate 4. be able to.

Further, in the first embodiment, the virtual cone breaking surface 61 of the fixing member 10 adjacent in the tunnel circumferential direction C and the tunnel axial direction D is continuous, so that the virtual cone breaking surface 61 is efficiently connected. Since the stiffening regions are formed, the stiffening regions can be easily formed, and the stiffening regions can be reliably against the stress in the tunnel circumferential direction C and the tunnel axial direction D acting on the composite segment 1A. Can resist.
This prevents the skin plate 4 and the concrete 6 from being separated from each other, so that the skin plate 4 and the concrete 6 can be reliably integrated to form a high-quality composite structure.
Further, since the fixing member 10 is configured by a headed stud divel, the skin plate 4 and the concrete 6 can be reliably integrated.

(Second Embodiment)
Next, other embodiments will be described with reference to the accompanying drawings, but the same or similar members and parts as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted. A different configuration will be described.
As shown in FIG. 4, the synthetic segment 1B according to the second embodiment is formed by replacing the fixing member 10B with a rod-shaped steel material such as round steel instead of the stud gibber used in the fixing member 10 of the first embodiment. A member (J-shaped steel material) formed by being bent so as to have a letter shape is used. A plurality of the fixing members 10B are arranged at predetermined intervals in the tunnel axis direction D and the tunnel circumferential direction C as in the first embodiment.

The fixing member 10B is formed such that one end 12 side is longer than the other end 13 side with respect to the substantially J-shaped curved portion 11, and one end 12 is welded to a skin plate (not shown). At this time, the fixing member 10B is installed in a direction that is substantially J-shaped when viewed from the tunnel axis direction D. The fixing member 10 </ b> B is configured such that the hoop muscle 9 is hung on the bending portion 11, and the hoop muscle 9 is fixed by the hoop muscle 9 being hung on the bending portion 11.
In addition, the hoop muscle 9 hung on the bending part 11 may be welded or tied with a binding wire as necessary.

  According to the synthetic segment 1B according to the second embodiment, the same effects as those of the first embodiment can be obtained, and the hoop muscle 9 can be easily fixed to the fixing member 10B.

(Third embodiment)
As shown in FIG. 5, in the synthetic segment 1C according to the third embodiment, L-shaped steel is used for the fixing member 10C in place of the stud gibber used for the fixing member 10 of the first embodiment.
10 C of fixing members are provided so that it may extend in the tunnel circumferential direction C, and it is the opposite side to the side joined to the other board part 15 of one board part 14 among a pair of orthogonal board parts 14 and 15. The end face 14a is welded to a skin plate (not shown).

One plate portion 14 is formed with a plurality of holes 14b, 14b,... At predetermined intervals in the extending direction (tunnel circumferential direction C), and each of the holes 14b, 14b,. The muscle 9 is configured to be inserted. For this reason, the interval between the holes 14b and 14b adjacent in the tunnel circumferential direction C is set to be substantially the same as the interval between the hoops 9 and 9 adjacent in the tunnel axis direction D.
The fixing member 10 </ b> C is configured such that the hoop muscles 9, 9... Are fixed by inserting the hoop muscles 9, 9.

The fixing member 10C may be an L-shaped steel having a length capable of fixing all the hoop bars 9, 9... Arranged in the tunnel circumferential direction C, or a length L divided into a plurality of lengths in the tunnel circumferential direction C. It may be a shape steel.
In the fixing member 10C of the third embodiment, as shown in FIG. 6, a virtual cone breaking surface 61C is formed by the other plate portion 15, so that a virtual cone breaking surface by the adjacent fixing members 10C and 10C is formed. It is preferable to set the shape and arrangement of the fixing member 10C so that 61C is continuous.

  According to the synthetic segment 1C according to the third embodiment, the same effects as those of the first embodiment can be obtained.

(Fourth embodiment)
As shown in FIG. 7, the synthetic segment 1D according to the fourth embodiment is not provided with the second main reinforcing bars 8, and the hoop bars 9, 9 ... each include a plurality of first main reinforcing bars 7, 7 ... one by one. The hoops 9, 9... Are fixed to the fixing member 10 one by one.

  According to the synthetic segment 1D according to the fourth embodiment, the first main reinforcing bars 7, 7... And the skin plate 4 are securely connected via the hoop bars 9 and the fixing member 10. ... and deformation and displacement of the skin plate 4 can be reliably prevented.

(Fifth embodiment)
As shown in FIG. 8, the composite segment 1E according to the fifth embodiment has the connecting members (ribs) 16 connected to the main girders 2 and 2 and the skin plate 4 spaced apart in the tunnel circumferential direction C (see FIG. 1). There are a plurality of open spaces.
The connecting member 16 is formed of, for example, a steel plate in a substantially triangular plate shape in the tunnel circumferential direction C, and the first end surface 16a is connected to the main beam 2 and the second end surface 16b is joined to the skin plate 4. The third end face 16 c faces the concrete 6.
The connecting member 16 is preferably connected to the main girders 2 and 2 and the skin plate 4 in the steel shell forming step or the fixing member joining step in the method of manufacturing the synthetic segment 1A of the first embodiment.

  According to the synthetic segment 1E according to the fifth embodiment, the main girder 2 and the skin plate 4 are securely connected via the connecting member 16, and the out-of-plane force acting on the skin plate 4 is supplied via the connecting member 16. Since it can be transmitted to the main girders 2 and 2, the buckling strength of the skin plate 4 can be improved.

As mentioned above, although embodiment of the synthetic segment by this invention and the manufacturing method of a synthetic segment was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.
In the above embodiment, the composite segments 1A to 1E are provided with the skin plate 4 only on the ground pile F side of the pair of main girders 2 and 2 and the pair of joint plates 3 and 3, but the pair of main girders 2 , 2 and the pair of joint plates 3 and 3 may be configured such that an arcuate skin plate 4 is also provided on the inner space G side.
In the above-described embodiment, the fixing member 10 is a headed stud diver, a J-shaped steel material, an L-shaped steel, or the like, but may be a T-shaped steel, a C-shaped steel (channel material), or the like. The joining between the member 10 and the skin plate 4 and the joining between the fixing member 10 and the hoop muscle 9 may be performed by a method other than welding or binding using a binding line.
In the above embodiment, the main girder 2 is formed of a flat plate and has a rectangular cross-sectional shape. However, the main girder 2 in the tunnel radial direction E or the ground F side or both. Is provided with a projecting plate (flange) projecting in the tunnel axis direction D, and the cross-sectional shape is substantially L-shaped, substantially I-shaped, substantially C-shaped (substantially U-shaped) or the like. It may be.

Further, in the above-described embodiment, the virtual cone breaking surfaces 61 and 61 of the fixing members 10 and 10 adjacent to each other in the tunnel circumferential direction C and the tunnel axial direction D are continuous but may not be continuous. .
Further, the fixing member 10 may use a member other than the shape as in the above embodiment as long as the skin plate 4 and the hoop muscle 9 can be connected. At this time, the virtual cone breaking surface 61 may not be formed by the fixing member 10.

Moreover, in said embodiment, the some 1st main reinforcing bars 7 and 7 are arranged substantially equally over the full length of the tunnel axial direction D of the concrete 6 part at predetermined intervals in the tunnel axial direction D. However, it does not need to be evenly arranged in the tunnel axis direction D of the concrete 6 portion.
For example, the plurality of first main reinforcing bars 7 and 7 may be arranged more densely at the center portion of the concrete 6 portion in the tunnel axis direction D than at both ends (in the vicinity of the main girders 2 and 2) in the tunnel axis direction D. . Usually, in the composite segment, since the rigidity of the central portion is lower than both end portions in the tunnel axis direction D in the vicinity of the main girders 2 and 2, the plurality of first main reinforcing bars 7 and 7 are arranged as described above. As a result, the rigidity of the entire combined segments 1A to 1E can be made uniform in the tunnel axis direction D.
As a result, the skin plate 4 is partially deformed out of plane, or some of the first main reinforcing bars 7, 7... Are deformed / displaced, and the cover concrete is peeled off or the adhesive splitting is broken. It can be prevented from happening. The second main reinforcing bars 8, 8... May be similarly arranged.

  Moreover, in said 5th Embodiment, although the connection member 16 is provided in the synthetic | combination segment 1E, you may provide the connection member 16 in synthetic | combination segment 1A-1D by embodiment other than 5th Embodiment.

1A to 1E Composite segment 2 Main girder 3 Joint plate 4 Skin plate 5 Steel shell 6 Concrete 7 First main rebar 8 Second main rebar 9 Hoop rebar 10, 10B, 10C Fixing member 16 Connecting member 61, 61C Virtual cone fracture surface C Tunnel circumferential direction D Tunnel axial direction E Tunnel radial direction F Ground mountain G Interior

Claims (8)

In the arc-shaped composite segment that is connected in plural along the inner wall of the tunnel excavation hole in the tunnel circumferential direction and tunnel axial direction,
A pair of main beams arranged in the tunnel axis direction at a predetermined interval and extending in the tunnel circumferential direction;
A joint plate joined so as to pass between the pair of main girders at both ends of the pair of main girders in the circumferential direction of the tunnel;
A skin plate joined to the outer side in the tunnel radial direction of the main girder and the joint plate;
A concrete filled inside a steel shell formed by the pair of main girders, the joint plate and the skin plate;
Inside the concrete,
A plurality of first main reinforcing bars extending in the tunnel circumferential direction inside the tunnel radial direction and arranged at predetermined intervals in the tunnel axis direction;
A hoop that surrounds the first main reinforcing bar;
And a fixing member that is bonded to the skin plate and to which the hoop line is fixed.   2. The synthetic segment according to claim 1, wherein the fixing member is made of a headed stud gibber, a T-shaped steel, an L-shaped steel, a C-shaped steel, or a J-shaped steel material. The fixing member and the skin plate are welded,
The fixing member and the hoop line are welded, or the hoop line is inserted into a hole formed in the fixing member, or the hoop line is hung on a protrusion formed on the fixing member. The synthetic segment according to claim 1 or 2, wherein the synthetic segment is formed.   A plurality of the fixing members are arranged at predetermined intervals in both or one of the tunnel circumferential direction and the tunnel axial direction, and are adjacent to both or one of the tunnel circumferential direction and the tunnel axial direction. 4. The composite segment according to claim 1, wherein each of the virtual cone breaking surfaces is continuous. 5.   5. The hoop bar surrounds each of the plurality of first main reinforcing bars one by one, and is fixed to the fixing member one by one. 6. Synthetic segment.   Inside the concrete, a plurality of second main reinforcing bars extending in the tunnel circumferential direction are arranged at a predetermined interval in the tunnel axial direction on the outer side in the tunnel radial direction than the first main reinforcing bars, The composite segment according to any one of claims 1 to 5, wherein a plurality of second main reinforcing bars are surrounded by the hoop bars together with the first main reinforcing bars.   Inside the concrete, there is one or more connecting members which are formed in a substantially triangular plate shape with the out-of-plane direction being the circumferential direction of the tunnel and whose end surfaces are connected to the main girder and the skin plate, respectively. The composite segment according to any one of claims 1 to 6, wherein a plurality of the segments are provided at predetermined intervals in the tunnel circumferential direction. A synthetic segment manufacturing method for manufacturing the synthetic segment according to any one of claims 1 to 7,
The joint plate is joined to both ends of the pair of main girders in the tunnel circumferential direction so as to pass between the pair of main girders, and the skin plate is formed on the ground side of the tunnel of the pair of main girders and the joint plate. Forming a steel shell by joining the steel shell,
A fixing member joining step for joining the fixing member to the skin plate;
A bar arrangement process for arranging the plurality of first main reinforcing bars and hoop bars inside the steel shell,
A hoop line fixing step of fixing the hoop line to the fixing member;
And a concrete filling step of filling the concrete into the steel shell.

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