JP2007239368A - Segment ring reinforcing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a segment ring reinforcing structure resistant to compression force operating in vertical and horizontal directions for simplifying work for transportation and installation. <P>SOLUTION: On the side of the cavity of the flat segment ring, two floor panels 10A, 10B are provided right and left in view from the cross section. A center wall 41 is fitted to a joint portion T1 between both floor panels 10A, 10B. Through each of the floor panels 10A, 10B, a PC steel material 30 is inserted perpendicularly to a tunnel axis extending to the approximately horizontal direction. The two PC steel materials 30A, 30B are fastened an connected to each other on the side of the cavity of the flat segment ring 2 in the horizontal direction with a coupler 42. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a floor slab mounting structure in which a floor slab is installed in a segment ring constructed by a shield method.

Conventionally, shield tunnels constructed for roads, railways, etc. have precast floor slabs. And generally, the cross section of the tunnel is constructed with a circular cross section. However, since the space actually used in the circular cross section is often an internal cross section excluding the upper and lower portions, a deformed cross section such as a substantially elliptical shape or a horseshoe shape (hereinafter referred to as a horseshoe shape) in which a substantially horizontally long tunnel space is formed. These are described as “flat tunnels”). In a flat segment ring constructed in such a flat tunnel, a vertical compressive force acts due to earth pressure from the outside and the weight of the segment as compared with a segment ring having a circular cross section. In particular, the bending moment acting on the flat segment ring is concentrated in the vicinity of the tunnel leg located obliquely below the cross section, and the maximum bending moment is generated.
In the conventional flat segment ring, as a method of reducing such a bending moment, the flat segment ring is given a high strength. For example, the segment thickness is increased by increasing the amount of reinforcing bars and increasing the thickness of the segment. Increased strength. However, increasing the thickness of the segment has been disadvantageous in that the segment becomes expensive and the tunnel excavation section becomes large, which is not economical. Thus, for example, Patent Document 1 proposes a structure corresponding to the above-described flat bending moment without increasing the strength of the flat segment ring itself.
Patent Document 1 provides a horizontal direction to a segment by providing a reinforcing member (a first reinforcing member) that forms a chord material that receives a tensile force in a horizontal direction and is arranged in a horizontal direction on the inner side of a flat tunnel. It gives compressive force. Furthermore, the concentrated stress acting on the flat segment ring is reduced by providing a rod-shaped reinforcing member (second reinforcing member) that receives a compressive force in the vertical direction (vertical direction) and is arranged in the vertical direction.
Japanese Patent No. 2520034

  However, Patent Document 1 has a structure that is strong against the compressive force in the vertical direction. However, a horizontal compressive force may be generated depending on construction conditions and ground conditions. The reinforcing member for the chord material provided in the horizontal direction has a high resistance to a tensile force, but has a drawback that it cannot withstand the compressive force received from the horizontal direction. In addition, when the tunnel has a large cross section, the length of the reinforcing member (first reinforcing member) to be arranged in the horizontal direction (the length in the direction perpendicular to the tunnel axis direction) becomes large, so that it can be transported and installed in the tunnel mine. There is a problem that the workability (handling) of the machine is deteriorated, the work efficiency is lowered, and the work period is extended.

  The present invention has been made in view of the above-described problems, and provides a segment ring reinforcing structure that can withstand compressive force acting in the vertical direction and horizontal direction, and that simplifies transportation and installation work. The purpose is to do.

In order to achieve the above object, a segment ring reinforcing structure according to the present invention is a segment ring reinforcing structure for reinforcing a segment ring constructed by a shield method. And a plurality of horizontal reinforcing members connected by connecting means so as to extend in a substantially horizontal direction, and arranged in a separated state without being joined to the horizontal reinforcing member, and a compression transmission member is fitted to the connecting portion. A plurality of floor slabs are provided.
According to the present invention, since the plurality of horizontal reinforcing members are connected in the horizontal direction on the inner space side of the segment ring by the connecting means, the connected horizontal reinforcing members can be subjected to a horizontal tensile force. And since the compression transmission member is fitted in the clearance gap between those connection parts, and the several floor slab is installed without the clearance gap in the horizontal direction, it can take in the compressive force which acts on a horizontal direction.

Further, in the segment ring reinforcing structure according to the present invention, the connecting means is a cylindrical fastening member having a female screw formed inside, and the connected horizontal reinforcing members are coaxial with each other inside the fastening member. It is preferable that they are screwed together.
According to the present invention, when the horizontal reinforcing members are screwed together and tightened so as to be coaxial, the horizontal reinforcing members can be uniformly tightened and connected, and the horizontal reinforcing members can be connected in the horizontal direction. Can be subjected to a tensile force.

Further, in the segment ring reinforcing structure according to the present invention, the connecting means is screwed into the locking plate fixed between the horizontal reinforcing members and the end of the horizontal reinforcing member inserted through the locking plate. It is preferable to use a tightening nut.
According to the present invention, the horizontal reinforcing members connected to each other are inserted into the locking plate, screwed with the nuts, and tightened, whereby the horizontal reinforcing members can be subjected to a horizontal tensile force.

In the segment ring reinforcing structure according to the present invention, it is preferable that a horizontal reinforcing member is inserted into the floor slab.
According to the present invention, the horizontal reinforcing member is built in the floor slab, and the tunnel interior can be used effectively.

In the segment ring reinforcing structure according to the present invention, a second compression transmission member for horizontally transmitting a compressive force in the horizontal direction acting on the segment ring is provided between the segment ring and the side surface of the floor slab. Preferably it is.
According to the present invention, when a substantially horizontal compression force acts on the segment ring, this compression force can be transmitted to the floor slab via the second compression transmission member.

According to the reinforcing structure of the segment ring of the present invention, the compressive force acting in the vertical direction of the segment ring can be withstood by the tensile force that the horizontal reinforcing member receives, and the compressive force acting in the horizontal direction can be withstood by the floor slab. Can do. Thereby, the bending moment which generate | occur | produces in a tunnel leg part can be reduced, and there exists an effect which can make the thickness dimension of a segment ring small by this.
Further, the plurality of horizontal reinforcing members can be easily connected by the connecting means, and the plurality of floor slabs can be easily brought into close contact with each other in the horizontal direction via the compression transmitting member to transmit the compression force. For this reason, the horizontal reinforcing member and the floor slab can be divided into dimensions according to the size of the tunnel cross section, the transportation and installation of these can be simplified, the work efficiency is improved, and the construction period is shortened, In particular, an excellent effect can be obtained when there is a restriction on the size of a large-section tunnel or transportation.

Hereinafter, a segment ring reinforcing structure according to a first embodiment of the present invention will be described with reference to FIGS.
1 is a cross-sectional view showing a reinforcing structure of a flat segment ring according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view showing a structure of a connecting portion of a PC steel material and a floor slab, and FIG. 4 is an enlarged view of the connecting portion shown in FIG. 3, FIG. 5 is a cross-sectional view showing the structure of the connecting portion of the tunnel leg portion, and FIG. 6 is a distribution diagram of the bending moment of the flat segment ring. The figure which shows an example, (b) is a figure which shows a comparative example.

  As shown in FIG. 1, the flat segment ring reinforcing structure 1 according to the first embodiment is a tunnel adopted for roads, railways, joint grooves, etc., and is extended into a natural ground by a shield method. The flat segment ring 2 having a cross-section horseshoe shape (hereinafter, this shape is described as “flat”) is reinforced.

First, the flat segment ring 2 will be described.
As shown in FIG. 1, the flat segment ring 2 is constructed by combining a plurality of curved segments 20. In the following, arc regions having a predetermined arc length located obliquely below the flat segment ring 2 in cross-sectional view will be described as “tunnel legs K1, K2.” Further, the segments arranged in the respective tunnel leg portions K1, K2 are referred to as leg segments 21, 21, and the segment arranged in the center of the bottom portion in a cross-sectional view and sandwiched between the two leg segment segments 21, 21 is defined as the bottom plate. A segment 22 (hereinafter referred to as a tunnel base K3 if necessary) is used.

As shown in FIGS. 1, 2 and 3, two floor slabs 10 </ b> A and 10 </ b> B are provided on the inner space side of the flat segment ring 2 on the left and right in a cross-sectional view (if necessary, these floor slabs 10 </ b> A and 10 </ b> B are connected to each other). (Collectively referred to as “floor slab 10”), and arranged such that the connecting surfaces 10a, 10b of the floor slabs 10A, 10B face each other with a predetermined gap R and are arranged in parallel in the tunnel axis direction. Yes. The floor slabs 10A and 10B are connected to each other through the connection surfaces 10a and 10b, and this connection portion is defined as a connection portion T1.
Each of the floor slabs 10A and 10B is made of a precast manufactured in advance at a factory or the like, and has a substantially rectangular shape. The floor slabs 10 </ b> A and 10 </ b> B are placed so as to have a predetermined height on the middle pillar 3 erected on the bottom disc segment 22 at the substantially central portion in the horizontal direction of the flat segment ring 2. On the middle pillar 3, the connecting portions T1 of the floor slabs 10A and 10B are arranged.

As shown in FIG. 4, each floor slab 10 is formed with an insertion hole 11 penetrating in a direction perpendicular to the tunnel axis, and a cylindrical sheath tube 12 is inserted into the insertion hole 11. A PC steel material 30 (horizontal reinforcing member) is inserted into the steel plate 12 so as to extend substantially horizontally. In the present embodiment, four PC steel materials 30... Are arranged at a predetermined interval in the tunnel axis direction with respect to one floor slab 10 (see FIG. 3). The PC steel material 30 is arranged in a separated state without being joined to the floor slab 10. The PC steel material 30 has both end portions 30a, 30a formed with male screws protruding outward from the side surface of the floor slab 10 with a predetermined length. In this way, the tunnel steel can be used effectively by adopting a configuration in which the PC steel material 30 is built in the floor slab 10.
Here, the PC steel material in the floor slab 10A will be described as 30A, and the PC steel material in the floor slab 10B will be described as 30B.

Next, the connection part T which connects floor slab 10A, 10B is demonstrated based on drawing.
As shown in FIGS. 2 and 3, the connecting portion T1 includes an inner wall 41 (compression transmission member) made of concrete or the like provided in a gap R between the floor slabs 10A and 10B, and the floor slabs 10A and 10B. A cylindrical coupler 42 (corresponding to the connecting means or the fastening member of the present invention) is provided for connecting the end portions 30a, 30a of the PC steel materials 30A, 30B inserted through. As shown in FIG. 4, a cutout 41 a is formed in the middle wall 41 at a position on the axis of the PC steel material 30. Since the end face 41b, 41b on the floor slab 10 is in close contact with the connecting faces 10a, 10b of the floor slabs 10A, 10B, the middle wall 41 is supplied with a compressive force in the horizontal direction via the middle wall 41. The action is transmitted to the plate 10.
And the coupler 42 forms the internal thread in the inner surface, and is screwing together the end parts 30a and 30a of both PC steel materials 30A and 30B to the both ends of the inner surface. In this way, when the coupler 42 is tightened in a state where the two PC steel materials 30A and 30B are screwed together so as to be coaxial with each other at the joint T1, the two PC steel materials 30A and 30B are uniformly tightened and integrated to be connected. can do. Therefore, the PC steel 30 can be given a tensile force in the horizontal direction.

Next, the 2nd junction part T2 which connects each floor slab 10 and the flat segment ring 2 (leg part segment 21) is demonstrated.
As shown in FIGS. 1 and 5, between the inner peripheral surface 21 a of the leg segment 21 and the side surfaces 10 c and 10 c of the floor slab 10 (that is, the surface on the leg segment 21, 21 side) is made of steel or the like. A fitting member 50 (second compression transmission member) is provided. As shown in FIG. 5, when a substantially horizontal compressive force acts on the flat segment ring 2, the compressive force is transmitted to the floor slab 10 via the fitting member 50. That is, the floor slab 10 can take a horizontal compressive force by providing the above-described inner wall 41 and the fitting member 50.
Further, the fitting member 50 is formed so as to project toward the center in the lateral direction so as to support the side lower end portion 10d of the floor slab 10 from below.

Further, as shown in FIG. 5, a bar-shaped deformed steel bar 61 is embedded in the leg segment 21 so as to be coaxial with the PC steel material 30 in a state where the floor slab 10 is installed at a predetermined position. The deformed steel bar 61 has an end 61a on which a male screw is formed exposed at a notch (not shown) formed by notching the inner peripheral surface 21a of the leg segment 21. A cylindrical second coupler 62 is provided as means for connecting the deformed steel bar 61 and the PC steel material 30. The second coupler 62 is formed by forming a female screw on the inner surface, screwing the end 61a of the deformed steel bar 61 into the inner surface of one 62a, and screwing the end 30a of the PC steel material 30 into the inner surface of the other 62b. Yes.
In this way, when the second coupler 62 is tightened in a state where the PC steel material 30 and the deformed steel rod 61 are coaxially connected at the tunnel leg portions K1 and K2, the deformed steel rod 61 and the PC steel material 30 are made uniform. The PC steel material 30 can be subjected to a horizontal tensile force.

Next, the operation of the PC steel material 30 and the floor slab 10 configured as described above will be described with reference to the drawings. In the description of the action, it is assumed that the PC steel material 30 and the floor slab 10 are connected and integrated by the connection portion T1 and the second connection portion T2 described above.
First, the operation of the PC steel material 30 will be described. In the flat segment ring 2 shown in FIGS. 6 (a) and 6 (b), a compressive force acts so that the tunnel cross section is crushed in the vertical direction due to earth pressure or the segment's own weight received from the outside of the cross section. Alternatively, the stress toward the outside of the tunnel is concentrated in the vicinity of the tunnel legs K1 and K2, and a maximum bending moment is generated.
Here, the bending moment is defined as “negative bending moment” when the flat segment ring 2 protrudes and bends to the outer peripheral side (bending that causes the flat segment ring 2 to act outward). The case of pushing to the side (bending that causes the flat segment ring 2 to act inward) is defined as a “positive bending moment”.
FIG. 6 (b) shows the bending moment of the comparative example that acts on the flat segment ring without the PC steel 30 or the floor slab 10 (see FIG. 1), and has a maximum value at a substantially middle portion of each tunnel leg K1, K2. It can be seen that negative bending moments M1 and M2 are generated, and a positive bending moment M3 having a maximum value is generated at the substantially central portion of the tunnel bottom K3 sandwiched between the tunnel legs K1 and K2. .

  Next, as shown in FIG. 6 (a), a PC steel material 30 is provided at a predetermined position of the tunnel legs K1, K2, and a direction (horizontal direction) in which the flat segment ring 2 is pulled toward the inner air side of the PC steel material 30. A tensile force is applied in the direction in which the compressive force is applied to. As a result, the maximum values of the negative bending moments M4, M5 acting on the vicinity of the tunnel legs K1, K2 and the positive bending moment M6 acting on the tunnel base K3 can be reduced.

When a horizontal compressive force is generated in the flat segment ring 2, the compressive force can be received by the floor slab 10. Thus, the floor slab 10 has an effect of reinforcing the PC steel material 30 and can suppress the compressive force applied to the PC steel material 30.
Further, since the PC steel material 30 responsible for the horizontal tensile force and the floor slab 10 responsible for the horizontal compression force are separated without being joined, the force acting on the flat segment ring 2 is applied to the PC steel material 30. And the floor slab 10 can be handled separately, and the efficient reinforcing structure 1 of the flat segment ring 2 can be realized.

  The above-described floor slab 10 and the PC steel material 30 shown in FIG. 1 are installed behind a shield excavator (not shown) during construction of the tunnel so that the PC steel material 30 receives a predetermined tensile force. And even after the construction of the tunnel, this tensile force can be adjusted appropriately. That is, the load acting on the flat segment ring 2 during tunnel construction, that is, short-term load such as when the backfill material is injected or immediately after excavation where the earth pressure changes greatly, or the load acting after tunnel construction, that is, earth pressure or vehicle It is preferable to arbitrarily adjust the tensile force in accordance with a long-term load (permanent load) such as when sharing.

As described above, in the segment ring reinforcement structure according to the first embodiment, the compressive force acting in the vertical direction of the flat segment ring 2 can be withstood by the tensile force that the PC steel material 30 takes and acts in the horizontal direction. The compressive force can be withstood by the floor slab 10. Thereby, the bending moment which generate | occur | produces in the tunnel leg parts K1 and K2 can be reduced, and there exists an effect which can make the thickness dimension of the flat segment ring 2 small by this.
Further, the plurality of PC steel materials 30 can be easily connected by the coupler 42, and the plurality of floor slabs 10 can be easily brought into close contact with each other in the horizontal direction via the inner wall 41 to transmit the compression force. . For this reason, the PC steel material 30 and the floor slab 10 can be divided into dimensions according to the size of the tunnel cross section, and the transportation and installation of these can be simplified, the work efficiency is improved, and the construction period is shortened. In particular, an excellent effect can be obtained when there is a restriction on the size of a large-section tunnel or transportation.

Next, the second and third embodiments of the present invention will be described with reference to FIGS. 7 and 8. The same reference numerals are used for members and parts that are the same as or similar to those of the first embodiment described above. A description of the configuration different from that of the first embodiment will be given by omitting the description.
7A and 7B are diagrams showing the structure of a connecting portion between PC steel materials according to the second embodiment, wherein FIG. 7A is a cross-sectional view corresponding to FIG. 2, and FIG. 7B is a horizontal cross-sectional view corresponding to FIG. is there.
As shown to Fig.7 (a), (b), it replaces with the connection structure by the coupler 42 (refer FIG. 4) of 1st embodiment, and uses the tension connection jig 70 in 2nd embodiment. It is the structure which connects PC steel materials 30A and 30B so that it may become substantially coaxial in the state in which the floor slab 10 was installed. The PC steel material 30 is provided so as to be inserted through the inside of the floor slab 10 (see FIG. 1) as in the embodiment.
Here, the tensile connection jig 70 corresponds to the connection means of the present invention, but precisely includes first and second tightening nuts 73 and 74 described later.
The tensile connection jig 70 is disposed so as to fit in the gap R of the connection portion T1 and is fixed to the upper portion of the middle column 3. The tensile connection jig 70 is formed in a substantially U-shape in cross-sectional view having an upper opening made of steel or the like, and is arranged on the joint surfaces 10a and 10b side of the floor slabs 10A and 10B so as to face each other with a predetermined interval. The flat plate-shaped two locking plates 71 and 71 and the bottom plate 72 which connects the locking plates 71 and 71 with the lower end part are formed.
Each locking plate 71, 71 is formed with a circular hole 71 a at a position coaxial with the PC steel material 30. And the end part 30a of the PC steel material 31 in which the external thread was formed in one circular hole 71a is inserted, the 1st fastening nut 73 is screwed together, and the end part 30a of the PC steel material 32 is inserted in the other circular hole 71a. The second tightening nut 74 is screwed through. By tightening the first and second nuts 73 and 74, the PC steel material 30 can receive a tensile force in the horizontal direction as in the first embodiment. In addition, since the tension connection jig 70 has the space S inside surrounded by a substantially U-shape, the end 30a may protrude toward the center of the space S when the PC steel material 30 is tightened. it can.
Moreover, the tension | tensile_strength connection jig 70 is fitted in the clearance gap R between floor slabs 10A and 10B, and has the effect | action which transmits the compressive force of a horizontal direction. Therefore, the tensile connection jig 70 is a connection means of the present invention and corresponds to a compression transmission member.
Furthermore, although detailed description is abbreviate | omitted about the connection part T2 of the floor slab 10 and the flat segment ring 2, it is set as the connection structure using the 2nd coupler 62 similarly to 1st embodiment shown in FIG. However, it is also possible to provide a connection structure in which a member corresponding to a locking plate is provided in the same manner as the connection portion T1 of the second embodiment, and the end 30a of the PC steel material 30 on the flat segment ring 2 side is tightened with a nut. Absent.
In the second embodiment, the PC steel materials 30 and 30 are divided in the horizontal direction, but can be given a tensile force in the horizontal direction as in the first embodiment by being connected at the joint T1. In addition, since the floor slab 10 can receive a compressive force acting in the horizontal direction, the same effects as those of the first embodiment can be obtained.

Next, FIG. 8 is a figure which shows the structure of the connection part of PC steel materials by 3rd embodiment, Comprising: (a) is sectional drawing corresponding to FIG. 2, (b) is the horizontal corresponding to FIG. It is sectional drawing.
As shown to Fig.8 (a), (b), in 3rd Embodiment, it replaces with the tension connection jig 70 (refer FIG. 7) in the connection part T1 of 2nd Embodiment, and is 2nd tension connection jig. 80 is used. And in the installation state of the floor slabs 10A and 10B, the PC steel material 30A inserted into the inside of one floor slab 10A is a tunnel axis with respect to the PC steel material 30B of the other floor slab 10B. They are arranged alternately in the direction. Other configurations are the same as those of the first and second embodiments.
The second tensile connection jig 80 is formed by extending a flat plate-like second locking plate 81 in the tunnel axis direction at the approximate center in the width direction of the gap R of the connection portion T1 on the middle column 3. A circular hole 81a is formed in the second locking plate 81 as shown at a position that is coaxial with the PC steel materials 30 of the two floor slabs 10A, 10B. Then, the end 30a of the PC steel material 30 is inserted into the circular hole 81a and connected by tightening with the nut 82, so that the PC steel material 30 is subjected to a horizontal tensile force as in the first and second embodiments. be able to. In the third embodiment, in the space S2 between the second locking plate 81 and the joint surfaces 10a and 10b of the floor slab 10, a solidified material such as concrete, for example, except for the attachment location of the nut 82. By filling 84 (second compression transmission member), the floor slab 10 can receive a compressive force acting in the horizontal direction.
Thus, also about 3rd embodiment, since the effect | action of PC steel 30 and the floor slab 10 is the same as that of 1st and 2nd embodiment, the same effect is acquired.

As mentioned above, although the 1st thru | or 3rd embodiment of the reinforcement structure of the segment ring by this invention was described, this invention is not limited to said 1st thru | or 3rd embodiment, The meaning is Changes can be made as appropriate without departing from the scope.
For example, in the first to third embodiments, the PC steel material 30 is inserted and incorporated inside the floor slab 10, but the floor slab 10 and the PC steel material 30 are provided at different positions. It doesn't matter.
Moreover, the installation number of PC steel materials 30 can be appropriately set according to the conditions of the ground. For example, in the case of bad ground, the PC steel material 30 may be appropriately increased, and in the case of good ground, the PC steel material 30 may be appropriately reduced and installed.
In the first to third embodiments, the floor slab 10 and the PC steel material 30 are divided into two parts, but the invention is not limited to being divided into two parts. In short, the number of floor slabs 10 and PC steel members 30 may be set as appropriate depending on the size of the tunnel cross section, the ease of carrying the floor slabs, and the like, as long as they are connected by the connecting portion T1.
In the first to third embodiments, the flat segment ring 2 is used for a tunnel with a flat cross section. However, it can also be used for a tunnel with a circular cross section.
Further, in the first to third embodiments, the PC steel material 30 and the floor slab 10 are installed in the tail of the shield excavator at the same time as the excavation. After the completion of the excavation, the PC steel material 30 and the floor slab 10 may be installed to introduce a tensile force to the PC steel material 30. Alternatively, the floor slab 10 and the PC steel material 30 may be attached at the same time, and the PC steel material 30 may be subjected to a tensile force after tunnel construction. Further, a new PC steel material may be added after the PC steel material 30 and the floor slab 10 are installed.

It is sectional drawing which shows the reinforcement structure of the flat segment ring by 1st embodiment of this invention. It is sectional drawing which shows the structure of the connection part of PC steel materials and a floor slab. It is a horizontal sectional view which shows the structure of the connection part of PC steel materials and a floor slab. It is an enlarged view of the connection part shown in FIG. It is sectional drawing which shows the structure of the connection part of a tunnel leg part. It is a distribution map of the bending moment of a flat segment ring, (a) is a figure showing an example and (b) is a figure showing a comparative example. It is a figure which shows the structure of the connection part of PC steel materials by 2nd embodiment, Comprising: (a) is sectional drawing corresponding to FIG. 2, (b) is a horizontal sectional view corresponding to FIG. It is a figure which shows the structure of the connection part of PC steel materials by 3rd embodiment, Comprising: (a) is sectional drawing corresponding to FIG. 2, (b) is a horizontal sectional view corresponding to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reinforcement structure 2 Flat segment ring 21 Leg segment 30 PC steel (horizontal reinforcement member)
10 Floor slab 41 Middle wall (compression transmission member)
42 Coupler (Tightening member)
50 Fitting member (second compression transmission member)
71 Locking plate 73 First tightening nut 74 Second tightening nut 81 Second locking plate 84 Solidified material (second compression transmission member)
K1, K2 Tunnel leg T1 connection part T2 second connection part

Claims (5)

A segment ring reinforcement structure for reinforcing a segment ring constructed by a shield method,
A plurality of horizontal reinforcing members connected by connecting means so as to extend substantially horizontally in a cross-sectional view on the inner space side of the segment ring;
A plurality of floor slabs that are arranged in a separated state without being joined to the horizontal reinforcing member, and in which a compression transmission member is fitted to the connecting portion;
A segment ring reinforcing structure characterized in that is provided. The connecting means is a cylindrical fastening member having a female screw formed on the inside,
2. The segment ring reinforcing structure according to claim 1, wherein the horizontal reinforcing members to be connected are screwed together so as to be coaxial with each other inside the fastening member.   The connection means includes a locking plate fixed between the horizontal reinforcing members, and a tightening nut that is screwed into an end of the horizontal reinforcing member inserted into the locking plate and tightened. The segment ring reinforcing structure according to claim 1, wherein:   The segment ring reinforcing structure according to any one of claims 1 to 3, wherein the horizontal reinforcing member is inserted into the floor slab. The second compression transmission member for transmitting the horizontal compression force acting on the segment ring in the horizontal direction is provided between the segment ring and a side surface of the floor slab. The reinforcing structure of the segment ring in any one of 1-4.

Images