JP2018031150A - Widening method and reinforcement device for tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a decline in construction efficiency and a rise in a construction cost when a tunnel is widened.SOLUTION: A widening method for tunnels 100, 200 includes the following steps for: fitting left side edge parts 1a, 1a' of first connection members 1, 1' on an undersurface of segments SL15, SR8, at the same time fitting right side edge parts 1b, 1b' of the first connection members 1, 1' on an undersurface of segments SL8, SR14, regarding segment rings 110, 210 of each of the tunnels; installing column members 3, 3' in each of the tunnels; separating segments SL9, SR9 from the segment rings 110, 210; fitting a connection adjustment piece 50 to the right side edge part of the segment SL15 of the tunnel 100, the connection adjustment piece constituting an upper left side edge part of a widened tunnel portion 300; and fitting a connection adjustment piece 50' to the left side edge part of the segment SR14 of the tunnel 200, the connection adjustment piece constituting an upper right side edge part of the widened tunnel portion 300.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a tunnel widening method and a tunnel reinforcement device used at the time of tunnel widening.

A tunnel used as a pipeline such as a road is constructed by a shield method, for example.
In the shield method, a shield machine is used. The shield machine is, for example, a cylindrical skin plate, a cutter head provided at the front end (face side end) of this skin plate for excavating natural ground, and a skin plate behind the cutter head. And an erector device that connects a plurality of segments along the circumferential direction to construct a segment ring, and a propulsion jack that is provided inside the skin plate.

  In the shield method, for example, a start shaft and a reaching shaft are built in the ground, and the ground is excavated with a shield machine from the start shaft to the arrival shaft, and then the segments are successively formed by the elector device at the rear of the skin plate. Are connected in the tunnel circumferential direction to construct a segment ring, and adjacent segment rings are connected in the tunnel axis direction to construct a cylindrical lining body. That is, the tunnel constructed by this method includes a segment ring constituted by a plurality of segments connected in the circumferential direction of the tunnel. In this construction method, the shield machine pushes the existing segment behind it with a propulsion jack and moves forward while excavating natural ground by the thrust generated as a reaction force.

  By the way, patent document 1 is disclosing the rejoining segment used when connecting between the tunnels constructed in the ground (namely, when expanding a tunnel). This rejoining segment has a rejoining end on one side in the tunnel circumferential direction. In addition, the rejoining segment is provided with a support column (see FIGS. 5 and 6 of Patent Document 1). Therefore, the rejoined segment has a special shape different from the segment used in the general portion of the tunnel (the portion of the tunnel that is not the widened portion).

JP 2007-182696 A

  However, in the case of constructing a tunnel using a rejoining segment as disclosed in Patent Document 1, an erector apparatus capable of assembling both the segment used in the general part and the rejoining segment is used as a shield machine. Needed to be equipped. In addition, when a tunnel is constructed using a rejoined segment as disclosed in Patent Document 1, it takes time to construct a segment ring, and thus it is difficult to construct a tunnel efficiently. Therefore, the construction cost has been increased.

  In view of such a situation, an object of the present invention is to suppress a decrease in construction efficiency and an increase in construction cost accompanying the widening of a tunnel.

  Therefore, in the first aspect of the present invention, the tunnel widening method is a method of widening a tunnel including a segment ring constituted by a plurality of segments connected in the circumferential direction of the tunnel. The method for widening the tunnel includes a first segment that forms an upper portion of the segment ring, a second segment that forms a segment ring by connecting the right end to the left end of the first segment, and the right end of the first segment. The left end of the first connection member is attached to the lower surface of the second segment, and the right side of the first connection member is attached to the lower surface of the third segment with respect to the third segment that forms the segment ring by connecting the left end to the portion Attaching an end, providing a support member for supporting the first connecting member from below in the tunnel, separating the first segment from the segment ring, and an upper component member constituting the upper portion of the tunnel widening portion, Attaching to the right end of the second segment or the left end of the third segment.

  In the second aspect of the present invention, the tunnel widening method is a method of widening a tunnel including a segment ring constituted by a plurality of segments connected in the circumferential direction of the tunnel. The tunnel widening method includes a first segment constituting a lower portion of the segment ring, a second segment having a right end connected to the left end of the first segment and constituting a segment ring, The left end portion of the first connecting member is attached to the upper surface of the second segment with respect to the third segment that forms the segment ring by connecting the left end portion to the right end portion of the segment. Attaching the right end of the first connecting member to the upper surface, providing a pressing member for pressing the first connecting member from above in the tunnel, separating the first segment from the segment ring, and widening the tunnel Attaching a lower constituent member constituting a lower portion of the portion to the right end of the second segment or the left end of the third segment.

  In the third aspect of the present invention, the tunnel reinforcement device is a device that reinforces a tunnel including a segment ring constituted by a plurality of segments connected in the circumferential direction of the tunnel. The segment ring includes a first segment located at an upper portion thereof, a second segment in which a right end is connected to a left end of the first segment, and a left end connected to a right end of the first segment. And 3 segments. A tunnel reinforcement device includes a first connection member having a left end attached to the lower surface of the second segment and a right end attached to the lower surface of the third segment, and a support member that supports the first connection member from below. And comprising.

  In a fourth aspect of the present invention, the tunnel reinforcement device is a device that reinforces a tunnel including a segment ring constituted by a plurality of segments connected in the circumferential direction of the tunnel. The segment ring includes a first segment located at a lower portion thereof, a second segment having a right end connected to a left end of the first segment, and a left end at a right end of the first segment. A connected third segment. The tunnel reinforcement device includes a first connecting member having a left end attached to the upper surface of the second segment and a right end attached to the upper surface of the third segment, and the first connecting member from above. A pressing member for pressing.

  According to the first and third aspects of the present invention, the left end of the first connecting member is attached to the lower surface of the second segment, and the right end of the first connecting member is attached to the lower surface of the third segment. The first connecting member is supported from below by the supporting member. Thereby, the segment of the structure similar to the segment used in the above-mentioned general part can be used, without using the rejoining segment which has the above-mentioned special shape as a 2nd segment and a 3rd segment. Therefore, when constructing a portion where the widening is planned in the tunnel, a segment ring can be efficiently constructed in the same manner as the above-described general part by using a general erector device. Therefore, an increase in construction cost can be suppressed.

  According to the second aspect and the fourth aspect of the present invention, the left end portion of the first connection member is attached to the upper surface of the second segment, and the right end portion of the first connection member is attached to the upper surface of the third segment. And the first connecting member is pressed from above by the pressing member. Thereby, the segment of the same structure as the segment used in the above-mentioned general part can be used as the second segment and the third segment without using the rejoining segment having the special shape as described above. . Therefore, when constructing a portion where the widening is planned in the tunnel, a segment ring can be efficiently constructed in the same manner as the above-described general part by using a general erector device. Therefore, an increase in construction cost can be suppressed.

The figure which shows schematic structure of the reinforcement apparatus of the tunnel in one Embodiment of this invention. The perspective view of the 1st connection member in an embodiment same as the above Cross-sectional view and bottom view of first connecting member in the same embodiment The perspective view of the 1st connection member and pillar member in an embodiment same as the above Enlarged view of segments in the same embodiment The figure which shows the widening method of the tunnel in embodiment same as the above The figure which shows the widening method of the tunnel in embodiment same as the above The figure which shows the widening method of the tunnel in embodiment same as the above The figure which shows the widening method of the tunnel in embodiment same as the above The figure which shows the widening method of the tunnel in embodiment same as the above The figure which shows the widening method of the tunnel in embodiment same as the above The figure which shows the widening method of the tunnel in embodiment same as the above The perspective view of the connection adjustment piece in embodiment same as the above

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration of tunnel reinforcement devices (hereinafter simply referred to as “reinforcement devices”) 10 and 10 ′ according to an embodiment of the present invention. FIG. 2 is a perspective view of the first connecting member 1. FIGS. 3A and 3B are a cross-sectional view and a bottom view of the first connecting member 1. For convenience of explanation, the following description will be given by defining front, rear, left and right as shown in FIGS. Here, the front-rear direction corresponds to the tunnel axis direction. The left-right direction corresponds to the tunnel width direction.

  In this embodiment, the tunnel widening portion 300 is formed so as to connect a pair of left and right tunnels 100 and 200 extending in parallel (see FIG. 1 and FIGS. 11 and 12 described later). At the time of forming and forming the tunnel widening portion 300, the reinforcing devices 10 and 10 'are used.

  Each of the tunnels 100 and 200 is a shield tunnel constructed by the shield method described above. In the present embodiment, the following description will be made assuming that the cross-sectional area of the left tunnel 100 is larger than the cross-sectional area of the right tunnel 200. However, the cross-sectional area of the left tunnel 100 is equal to or smaller than the cross-sectional area of the right tunnel 200. It may be.

  As shown in FIG. 1, the left tunnel 100 includes a segment ring 110 constituted by a plurality (15 in FIG. 1) of arc-shaped segments SL1 to SL15 connected in the circumferential direction of the tunnel. In the left tunnel 100, adjacent segment rings 110 are connected in the tunnel axis direction. Here, in this embodiment, segment SL1 located in the lower end part of each segment ring 110 and segment SL9 located in an upper end part are arrange | positioned so that it may each line up in series along a tunnel axial direction. That is, normally, the connecting portions of a plurality of segments in the segment ring 110 are arranged in a staggered manner, for example, so as to be different from those adjacent in the tunnel axis direction. In this embodiment, the segment SL9 and the segments SL15 and SL8 are arranged. And the connection points between the segment SL1 and the segments SL10 and SL2 are arranged so that those adjacent in the tunnel axis direction are arranged in series without being different in the tunnel axis direction. In this embodiment, the segment ring 110 is composed of 15 segments, but the number of segments constituting the segment ring 110 is not limited to this.

  In the present embodiment, the segments SL1 to SL9 constituting the substantially right half of the segment ring 110 of the left tunnel 100 are temporary segments, for example, steel segments. On the other hand, the segments SL10 to SL15 constituting the substantially left half of the segment ring 110 of the left tunnel 100 are permanent segments, for example, synthetic segments obtained by filling a steel segment with concrete.

  Here, the segment SL9 corresponds to the “first segment” of the present invention. The segment SL15 corresponds to the “second segment” of the present invention. The segment SL8 corresponds to the “third segment” of the present invention. The segment ring 110 includes a segment SL9 located at an upper portion thereof, a segment SL15 having a right end connected to the left end of the segment SL9, a segment SL8 having a left end connected to the right end of the segment SL9, including.

  The segment SL1 corresponds to the “fourth segment” and the “first segment” of the present invention. The segment SL10 corresponds to the “fifth segment” and the “second segment” of the present invention. The segment SL2 corresponds to the “sixth segment” and the “third segment” of the present invention. The segment ring 110 includes a segment SL1 located at a lower portion thereof, a segment SL10 having a right end connected to the left end of the segment SL1, a segment SL2 having a left end connected to the right end of the segment SL1, including.

  A temporary floor slab 120 is provided in the tunnel 100 on the left side. A vehicle can travel on the floor slab 120. The floor slab 120 is formed with a through hole 121 for inserting a column member 4 described later.

  The right tunnel 200 includes a segment ring 210 formed by a plurality (14 in FIG. 1) of arc-shaped segments SR1 to SR14 connected in the circumferential direction of the tunnel. In the right tunnel 200, adjacent segment rings 210 are connected in the tunnel axis direction. Here, in this embodiment, segment SR1 located in the lower end part of each segment ring 210 and segment SR9 located in an upper end part are arranged so that it may line up in series along the tunnel axis direction, respectively. That is, normally, the connecting portions of the plurality of segments in the segment ring 210 are arranged in a staggered manner, for example, so as to be different from those adjacent in the tunnel axis direction. In this embodiment, the segment SR9 and the segments SR8, SR14 are arranged. Are connected to each other in the tunnel axis direction and arranged in series without being different in the tunnel axis direction. In this embodiment, the segment ring 210 is composed of 14 segments, but the number of segments constituting the segment ring 210 is not limited to this.

  In the present embodiment, the segments SR1 to SR9 constituting the substantially left half of the segment ring 210 of the right tunnel 200 are temporary segments, for example, steel segments. On the other hand, the segments SR10 to SR14 constituting the substantially right half of the segment ring 210 of the right tunnel 200 are permanent segments, for example, synthetic segments.

  Here, the segment SR9 corresponds to the “first segment” of the present invention. The segment SR8 corresponds to the “second segment” of the present invention. The segment SR14 corresponds to the “third segment” of the present invention. The segment ring 210 includes a segment SR9 located at an upper portion thereof, a segment SR8 having a right end connected to the left end of the segment SR9, a segment SR14 having a left end connected to the right end of the segment SL9, including.

  The segment SR1 corresponds to the “fourth segment” and the “first segment” of the present invention. The segment SR2 corresponds to the “fifth segment” and the “second segment” of the present invention. The segment SR10 corresponds to the “sixth segment” and the “third segment” of the present invention. The segment ring 210 includes a segment SR1 located at a lower portion thereof, a segment SR2 whose right end is connected to the left end of the segment SR1, a segment SR10 whose left end is connected to the right end of the segment SR1, including.

  A temporary floor slab 220 is provided in the right tunnel 200. A vehicle can travel on the floor slab 220. The floor slab 220 is formed with a through hole 221 for inserting a column member 4 ′ described later.

The reinforcing device 10 is installed in the tunnel 100 on the left side.
The reinforcing device 10 includes a first connecting member 1, a second connecting member 2, pillar members 3 and 4, and a jack 5.

  The first connecting member 1 is for connecting the segment SL15 and the segment SL8 across the segment SL9. The left end 1a of the first connecting member 1 is attached to the lower surface of the segment SL15 (the surface on the inner peripheral side of the segment ring 110), and the right end 1b is the lower surface of the segment SL8 (the inner peripheral surface of the segment ring 110). ).

  A recess 1 c is formed on the upper surface of the first connection member 1. The segment SL9 is opposed to the bottom surface 1d of the recess 1c with a gap. That is, the segment SL9 is opposed to the first connection member 1 with a gap therebetween without contacting the first connection member 1.

  The second connecting member 2 is for connecting the segment SL10 and the segment SL2 across the segment SL1. The left end 2a of the second connecting member 2 is attached to the upper surface of the segment SL10 (the inner peripheral surface of the segment ring 110), and the right end 2b is the upper surface of the segment SL2 (the inner peripheral surface of the segment ring 110). ). Here, the second connecting member 2 corresponds to the “first connecting member” of the present invention.

  A recess 2 c is formed on the lower surface of the second connection member 2. The segment SL1 is opposed to the bottom surface 2d of the recess 2c with a gap. That is, the segment SL1 is opposed to the second connection member 2 with a gap therebetween without contacting the second connection member 2.

  Between the first connection member 1 and the second connection member 2, a column member 3, a jack 5, and a column member 4 are installed in order from the top to the bottom. The column member 3 has an upper end attached to the left end 1 a of the first connecting member 1 and a lower end abutted with the upper end of the jack 5. The column member 4 has an upper end abutted against a lower end of the jack 5 and a lower end attached to the left end 2 a of the second connection member 2. The column member 4 is inserted into the through hole 121 of the floor slab 120.

The column members 3 and 4 extend in the vertical direction, and are formed of, for example, H-section steel.
The jack 5 is extendable in the vertical direction. The jack 5 is, for example, a giraffe jack. The jack 5 can be hydraulically operated.
Here, the column member 3 corresponds to the “support member” of the present invention and supports the first connecting member 1 from below. The column member 4 corresponds to the “pressing member” of the present invention and presses the second connecting member 2 from above.

The reinforcing device 10 ′ is installed in the right tunnel 200.
The reinforcing device 10 ′ includes a first connecting member 1 ′, a second connecting member 2 ′, column members 3 ′ and 4 ′, and a jack 5 ′.

  The first connecting member 1 'is for connecting the segment SR8 and the segment SR14 across the segment SR9. The left end 1a ′ of the first connecting member 1 ′ is attached to the lower surface of the segment SR8 (the inner peripheral surface of the segment ring 210), and the right end 1b ′ is the lower surface of the segment SR14 (the inner periphery of the segment ring 210). Side surface).

  A recess 1c 'is formed on the upper surface of the first connection member 1'. The segment SR9 is opposed to the bottom surface 1d 'of the recess 1c' with a gap. That is, the segment SR9 is opposed to the first connection member 1 'with a gap therebetween without contacting the first connection member 1'.

  The second connecting member 2 'is for connecting the segment SR2 and the segment SR10 across the segment SR1. The left end 2a ′ of the second connecting member 2 ′ is attached to the upper surface of the segment SR2 (the inner peripheral surface of the segment ring 210), and the right end 2b ′ is the upper surface of the segment SR10 (the inner periphery of the segment ring 210). Side surface). Here, the second connection member 2 ′ corresponds to a “first connection member” of the present invention.

  A recess 2c 'is formed on the lower surface of the second connection member 2'. The segment SR1 is opposed to the bottom surface 2d 'of the recess 2c' with a gap. That is, the segment SR1 is opposed to the second connecting member 2 'with a gap therebetween without contacting the second connecting member 2'.

  Between the first connection member 1 ′ and the second connection member 2 ′, a column member 3 ′, a jack 5 ′, and a column member 4 ′ are installed in order from the top to the bottom. The column member 3 ′ has an upper end attached to the right end 1 b ′ of the first connection member 1 ′ and a lower end abutted against the upper end of the jack 5 ′. The column member 4 ′ has an upper end abutting against a lower end of the jack 5 ′ and a lower end attached to the right end 2 b ′ of the second connection member 2 ′. The column member 4 ′ is inserted into the through hole 221 of the floor slab 220.

The column members 3 ′ and 4 ′ extend in the vertical direction, and are formed of, for example, H-section steel.
The jack 5 'is extendable in the vertical direction. The jack 5 ′ is, for example, a giraffe jack. The jack 5 'can be hydraulically operated.
Here, the column member 3 ′ corresponds to the “support member” of the present invention and supports the first connecting member 1 ′ from below. The column member 4 ′ corresponds to the “pressing member” of the present invention and presses the second connecting member 2 ′ from above.

Next, the detail of the 1st connection member 1 is demonstrated using FIG.2 and FIG.3.
The main body portion 20 of the first connecting member 1 includes a pair of arc-shaped main girders 21 and 21 arranged in parallel and spaced apart from each other in the tunnel axis direction, and a main girder 21 arranged to be separated from each other in the tunnel circumferential direction. , 21 are connected to each other by a pair of plate-like members 22, 22, and have a box shape that is rectangular in plan view (that is, viewed from above or below). The main body 20 has an upper surface and a lower surface that are open. The length of the main body portion 20 in the tunnel axis direction corresponds to, for example, one ring of the segment ring 110.

  A plurality of (five in FIG. 3A) plate-like rib members 23 extending in the tunnel axis direction and connecting the main girders 21 and 21 are provided in the main body 20. In the present embodiment, the number of rib members 23 is five, but the number of rib members 23 is not limited to this and is arbitrary.

  In the main girder 21, a concave portion 21 a is formed at a portion corresponding to the concave portion 1 c of the first connecting member 1 so as to keep downward from the upper edge of the main girder 21.

  A plate-like member 25 is provided at the left end 20a of the main body 20 so as to close the upper surface opening. A plurality of bolt insertion holes 26 are formed in the plate member 25. The lower surface of the segment SL15 abuts on the upper surface of the plate member 25. A plurality of insert fittings are installed in advance in the segment SL15, and a bolt is inserted into the bolt insertion hole 26 from the tunnel 100 in a state where the lower surface of the segment SL15 is in contact with the upper surface of the plate member 25. The left end 1a of the first connecting member 1 is fixed to the lower surface of the segment SL15.

  A plate-like member 27 is provided on the upper edge of each main beam 21 at the right end 20 b of the main body 20. A plurality of bolt insertion holes 28 are formed in the plate member 27. A connection plate (not shown) provided in advance on the lower edge of the segment SL8 abuts on the upper surface of the plate member 27. A plurality of bolt insertion holes are formed in the connection plate in advance. With the lower surface of the segment SL8 (the lower surface of the connection plate) in contact with the upper surface of the plate member 27, bolts are inserted from the tunnel 100 into the bolt insertion holes 28 of the plate member 27 and the bolt insertion holes of the connection plate. By tightening together, the right end 1b of the first connecting member 1 is fixed to the lower surface of the segment SL8.

  The second connecting member 2 has the same configuration as that obtained by inverting the first connecting member 1 up and down. The first connecting member 1 'has the same configuration as that obtained by inverting the first connecting member 1 left and right. The second connecting member 2 'has the same configuration as that obtained by inverting the first connecting member 1' up and down. Therefore, the description about these is abbreviate | omitted.

As shown in FIG. 1, when the first connecting member 1 is attached to the segment ring 110, the left edge P1 and the right edge P2 on the lower surface of the segment SL9 are in plan view (that is, viewed from above or below). ) Located in the recess 1 c of the first connecting member 1. That is, the connecting portions at both ends, which are the left edge P1 and the right edge P2 of the segment SL9, are positioned so as to face the concave portion 1c of the first connecting member 1.
When the second connection member 2 is attached to the segment ring 110, the left edge P3 and the right edge P4 on the upper surface of the segment SL1 are in plan view (that is, viewed from above or below) of the second connection member 2. Located in the recess 2c. That is, the connecting portions at both ends, which are the left edge P3 and the right edge P4 of the segment SL1, are positioned so as to face the concave portion 2c of the second connection member 2.

When the first connection member 1 ′ is attached to the segment ring 210, the left edge P5 and the right edge P6 on the lower surface of the segment SR9 are in the plan view (that is, viewed from above or below) the first connection member 1 It is located in the 'recess 1c'. That is, the segment SR9 is positioned so that the connecting portions at both ends, which are the left edge P5 and the right edge P6 of the segment SR9, face the concave portion 1c ′ of the first connection member 1 ′.
When the second connection member 2 ′ is attached to the segment ring 210, the left edge P7 and the right edge P8 on the upper surface of the segment SR1 are in plan view (that is, viewed from above or below) the second connection member 2 It is located in 'recess 2c'. That is, the connecting portions at both ends, which are the left edge P7 and the right edge P8 of the segment SR1, are positioned so as to face the concave portion 2c ′ of the second connection member 2 ′.

FIG. 4 is a perspective view of the first connecting member 1 and the column member 3 in the present embodiment.
As shown in FIG. 4, the first connection member 1 and the column member 3 are arranged in the tunnel axis direction. Here, with respect to the adjacent first connecting members 1, the main girders 21 are in contact with each other. The column members 3 are arranged at intervals in the tunnel axis direction, for example, at a pitch of one ring of the segment ring 110.

  Although illustration is omitted, the second connection member 2 and the column member 4 are arranged in the tunnel axis direction in the same manner as the first connection member 1 and the column member 3. Here, with respect to the adjacent second connecting members 2, the main girders 21 are in contact with each other. The column members 4 are arranged at intervals in the tunnel axis direction, for example, at a pitch of one ring of the segment ring 110.

  Although not shown, like the first connecting member 1 and the column member 3, the first connecting member 1 'and the column member 3' are arranged in the tunnel axis direction. Here, with respect to the adjacent first connecting members 1 ′, the main girders 21 are in contact with each other. The column members 3 ′ are arranged at intervals in the tunnel axis direction, for example, at a pitch of one ring of the segment ring 210.

  Although not shown, like the first connecting member 1 and the column member 3, the second connecting member 2 'and the column member 4' are arranged in the tunnel axis direction. Here, with respect to the adjacent second connecting members 2 ′, the main girders 21 are in contact with each other. The column members 4 ′ are arranged at intervals in the tunnel axis direction, for example, at a pitch of one ring of the segment ring 210.

Here, the configuration of the segment SL1 will be described with reference to FIG.
FIG. 5 is an enlarged view of the segment SL1 in FIG. Here, FIG. 5 shows a straight line K1 extending outward from the center of the segment ring 110 and passing through the left edge P3 of the upper surface of the segment SL1, and outward from the center of the segment ring 110 in the tunnel radial direction. A straight line K2 extending through the right edge P4 of the upper surface of the segment SL1 is shown.

  As shown in FIG. 5, the left end surface 41 of the segment SL1 is inclined so as to move away from the straight line K1 toward the left side from the left edge P3 of the upper surface of the segment SL1 toward the outer side in the tunnel radial direction. On the other hand, the right end face 42 of the segment SL1 is inclined so as to move away from the straight line K2 toward the right side from the right edge P4 of the upper surface of the segment SL1 toward the outer side in the tunnel radial direction. Since the segment SL1 is formed in this way, it can be removed from the segment ring 110 outward in the tunnel radial direction.

The segment SL9 is also formed in the same manner as the segment SL1, and therefore can be removed from the segment ring 110 outward in the tunnel radial direction.
Further, the segments SR1 and SR9 are formed in the same manner as the segment SL1, and therefore can be detached from the segment ring 210 outward in the tunnel radial direction.

Next, a method for widening the tunnels 100 and 200 will be described with reference to FIGS.
FIG. 6A to FIG. 12S show a method for widening the tunnels 100 and 200 (a method for forming the tunnel widened portion 300) in the present embodiment.

  First, as shown in FIGS. 6A and 6A, the reinforcing devices 10 and 10 ′ are provided in the tunnels 100 and 200.

  Next, as shown in FIG. 7C, the space 30 is formed by excavating the earth and sand on the upper right side of the left tunnel 100 (including the upper side of the segment SL9). A heavy machine such as a backhoe used for excavation of the earth and sand may go out of the tunnel 100 through a construction opening (not shown) formed by opening a part of the tunnel 100 in advance and head for a construction site. it can. When the space 30 is formed, an upward arch-shaped support 31 is formed by the steel support material and the shotcrete. The excavation of the space 30 is excavated over substantially the entire length of the tunnel widening portion 300 in the tunnel axis direction. For example, the space 30 is connected to the internal space of the tunnel 100.

Next, as shown in FIG. 7D, earth and sand are excavated so as to expand the space 30 rightward and downward. At this time, the arch-shaped support 31 is also expanded rightward.
At the stage shown in FIG. 7D, an upper inter-tunnel support 61 is installed between the left tunnel 100 and the right tunnel 200. The space 30 includes the lower surface of the arch-shaped support 31, the outer peripheral surface of the left tunnel 100 (the ground surface of the segments SL7 to SL9 and SL15), and the outer peripheral surface of the right tunnel 200 (the ground of the segments SR7 to SL9 and SR14). It is temporarily closed by being surrounded by a mountain-side surface) and an upper tunnel support 61.
In the stage shown in FIG. 7D, a temporary floor slab (not shown) is provided in the space 30 on the upper tunnel support 61 for material conveyance.

  Next, the segment SL9 is removed as shown in FIG. In the removal of the segment SL9, the segment SL9 is separated from the segment ring 110 of the left tunnel 100, and the segment SL9 is moved into the space 30. The separated segment SL9 is transported to the construction opening of the tunnel 100 connected to the space 30 by transport means that travels on the floor slab on the upper inter-tunnel support 61.

  Also, as shown in FIG. 8 (o), the segment SR9 is removed. In the removal of the segment SR9, the segment SR9 is separated from the segment ring 210 of the right tunnel 200, and the segment SR9 is moved into the space 30. The separated segment SR9 is transported to the construction opening of the tunnel 100 connected to the space 30 by transport means that travels on the floor slab on the upper inter-tunnel support 61.

Next, as shown in FIG. 8F, the left end of the connection adjustment piece 50 is attached to the right end of the segment SL15. Here, the left end portion of the arc-shaped roof segment 51 is attached in advance to the right end portion of the connection adjustment piece 50 (for example, grounded in advance).
Further, as shown in FIG. 8 (f), the right end of the connection adjustment piece 50 ′ is attached to the left end of the segment SR14. Here, the left end portion of the arc-shaped roof segment 51 ′ is attached in advance to the left end portion of the connection adjustment piece 50 ′ (for example, grounded in advance).

  Next, as shown in FIG. 9 (G), the left end of the arcuate roof segment 52 is attached to the right end of the roof segment 51, and the arcuate roof segment 52 'is attached to the left end of the roof segment 51'. Are attached to each other, and an arcuate roof segment 53 is inserted between the roof segments 52 and 52 'to be connected to each other, whereby an upwardly convex upper arch roof segment 55 is formed.

  As described above, the left tunnel 100 and the right tunnel 200 are closed by the upper arch roof segment 55. The steps shown in FIGS. 7D to 9G are performed, for example, every two rings.

  Here, the upper arch roof segment 55 includes roof segments 51, 51 ′, 52, 52 ′, and 53. The upper arch roof segment 55 and the connection adjustment pieces 50, 50 'constitute the upper portion of the tunnel widening portion 300 (see FIGS. 11 and 12). The connection adjustment pieces 50 and 50 ′ correspond to “upper constituent members” of the present invention. The connection adjustment piece 50 corresponds to the “first upper constituent member” of the present invention. The connection adjustment piece 50 'corresponds to the "second upper constituent member" of the present invention.

  Next, the backfilling injection material is injected into a space 58 surrounded by the arch-shaped support 31, the upper arch roof segment 55, and the connection adjustment pieces 50 and 50 '. As the backfilling injecting material, urethane based injecting material, mortar based injecting material, or locally added soil added with cement can be used.

  Next, as shown in FIG. 9 (ku), lower center excavation is performed at the location where the formation of the upper arch roof segment 55 is completed. A heavy machine such as a backhoe used for excavation of the lower central part goes out of the tunnel 100 through a construction opening (not shown) formed by cutting a part of the tunnel 100 in advance and heads for a drilling construction site. Can do. In this lower central excavation, after the lower central space 32 is formed, the lower tunnel support 62 is installed. The lower central space 32 is excavated over the entire length of the tunnel widening portion 300 in the tunnel axis direction. For example, the lower central space 32 is connected to the inner space of the left tunnel 100. Here, in the region 63 between the upper tunnel support 61 and the lower tunnel support 62, earth and sand are left without being excavated.

  Next, as shown in FIG. 10 (K), the soil on the lower right side (including the lower side of the segment SL1) of the left tunnel 100, and the soil on the lower left side (including the lower side of the segment SR1) of the right tunnel 200, The lower central space 32 is expanded to the left and right to form a lower space 33. On the excavation surface formed by this excavation, a downwardly convex arch-shaped support 34 is formed of shotcrete. In addition, you may abbreviate | omit the arch-shaped support 34 by this shotcrete.

  Next, the segment SL1 is removed as shown in FIG. In the removal of the segment SL1, the segment SL1 is separated from the segment ring 110 of the left tunnel 100, and the segment SL1 is moved into the lower space 33. The separated segment SL1 is transported to the construction opening of the tunnel 100 connected to the lower space 33 by an appropriate transport means.

  Further, as shown in FIG. 10 (ko), the segment SR1 is removed. In the removal of the segment SR1, the segment SR1 is separated from the segment ring 210 of the right tunnel 200, and the segment SR1 is moved into the lower space 33. The separated segment SR1 is transported to the construction opening of the tunnel 100 connected to the lower space 33 by appropriate transport means.

Next, as shown in FIG. 11 (a), the left end of the connection adjustment piece 70 is attached to the right end of the segment SL10. Here, the left end portion of the arc-shaped roof segment 71 is attached in advance to the right end portion of the connection adjustment piece 70 (for example, grounded in advance).
Further, as shown in FIG. 11 (s), the right end of the connection adjustment piece 70 ′ is attached to the left end of the segment SR10. Here, the left end portion of the arc-shaped roof segment 71 ′ is attached in advance to the left end portion of the connection adjustment piece 70 ′ (for example, grounded in advance).

  Next, as shown in FIG. 11 (a), the left end of the arcuate roof segment 72 is attached to the right end of the roof segment 71, and the arcuate roof segment 72 'is attached to the left end of the roof segment 71'. Are attached to each other, and an arcuate roof segment 73 is inserted between the roof segments 72 and 72 ′ to be connected to each other, whereby a downwardly projecting lower arch roof segment 75 is formed.

  Here, the lower arch roof segment 75 includes roof segments 71, 71 ′, 72, 72 ′, 73. The lower arch roof segment 75 and the connection adjustment pieces 70 and 70 ′ constitute the lower part of the tunnel widening portion 300. The connection adjustment pieces 70 and 70 ′ correspond to “lower constituent members” of the present invention.

  Next, the backfilling injection material is injected into a space 78 surrounded by the arched support 34 or the arched excavation surface, the lower arch roof segment 75 and the connection adjusting pieces 70 and 70 ′. As the backfilling injecting material, urethane based injecting material, mortar based injecting material, or locally added soil added with cement can be used.

  As described above, the left tunnel 100 and the right tunnel 200 are closed by the lower arch roof segment 75. The steps shown in FIGS. 10 (A) to 11 (S) are performed, for example, every two rings.

Next, as shown in FIG. 11 (si), the reinforcing devices 10, 10 ′ are removed from the tunnels 100, 200.
Next, as shown in FIG. 12 (s), the segments SL2 to SL8, SR2 to SR8, the floor slabs 120 and 220, the upper tunnel support 61, and the lower tunnel support 62 are removed. Further, the earth and sand existing in the region 63 between the upper tunnel support 61 and the lower tunnel support 62 is removed. In this way, a large space 80 surrounded by the segments SL10 to SL15, SR10 to SR14, the upper arch roof segment 55, the lower arch roof segment 75, and the connection adjustment pieces 50, 50 ′, 70, and 70 ′ is formed. The underground structure 81 is formed. Although illustration is omitted, a floor slab is provided in the underground structure 81.

Here, the connection adjustment piece 50 will be described with reference to FIG.
FIG. 13 is a perspective view of the connection adjustment piece 50.
The connection adjusting piece 50 is connected to a pair of main girders 91 and 91 arranged in parallel and spaced apart from each other in the tunnel axis direction, and is connected to the ends of the main girders 91 and 91 arranged to be separated from each other in the circumferential direction of the tunnel. A pair of joint plates 92a and 92b, a skin plate 93 provided so as to close an opening surrounded by the upper edge of the main girder 91 and the upper edge of the joint plate 92, and a plate shape for connecting the main girders 91 and 91 to each other Rib members (not shown).

  The right end of the segment SL15 is attached to the joint plate 92a of the connection adjustment piece 50. The left end of the roof segment 51 is attached to the joint plate 92b of the connection adjusting piece 50.

  The connection adjustment piece 50 is assumed to have the coordinates of the end face of the right end portion of the segment SL15, and the dimensions of the connection adjustment piece 50 from the coordinates and the design coordinates of the joint surface (the end face of the left end portion) of the roof segment 51. And the connection adjustment piece 50 can be manufactured. When the actual coordinates of the end surface of the right end portion of the segment SL15 are deviated from the above assumption in the vertical direction, tunnel axis direction, and tunnel width direction, the joint plate 92a side of the connection adjustment piece 50 must be adjusted. Don't be. For this reason, it is preferable that the joint plate 92a (joint surface of the connection adjusting piece 50) has a larger area than the end surface of the right end portion of the segment SL15 (joint surface of the segment SL15). Even in this case, since the first connection member 1 has the recess 1c, it is avoided that the joint plate 92a side of the connection adjustment piece 50 contacts the first connection member 1, and eventually, to the segment SL15 of the connection adjustment piece 50. The degree of freedom of mounting can be improved.

  In addition, about the connection adjustment piece 50, after removing segment SL9 shown in FIG.8 (o), the coordinate of the end surface of the right end part of segment SL15 is measured, the measurement result, and the joint surface (left side of the roof segment 51) The connection adjustment piece 50 may be manufactured by determining the dimensions of the connection adjustment piece 50 from the design coordinates of the end face of the end portion.

  The manufacturing method of the connection adjustment pieces 50 ′ 70, 70 ′ is the same as the manufacturing method of the connection adjustment piece 50 described above, and the description thereof is omitted.

  According to this embodiment, the method for widening the tunnels 100 and 200 is a method for widening a tunnel including the segment rings 110 and 210 configured by a plurality of segments connected in the circumferential direction of the tunnel. The widening method of the tunnels 100 and 200 is such that the segment SL9, SR9 (first segment) constituting the upper part of the segment rings 110, 210 and the left end of the segments SL9, SR9 (first segment) are connected to the right end. Segments SL15, SR8 (second segment) constituting segment rings 110, 210 and segments constituting segment rings 110, 210 by connecting the left end to the right ends of segments SL9, SR9 (first segment) With respect to SL8 and SR14 (third segment), the left ends 1a and 1a 'of the first connecting members 1 and 1' are attached to the lower surfaces of the segments SL15 and SR8 (second segment), and the segments SL8 and SR14 (third segment) are attached. The right end 1b, 1b of the first connecting member 1, 1 'on the lower surface of the segment) , Column members 3 and 3 ′ (support members) for supporting the first connection members 1 and 1 ′ from below are provided in the tunnels 100 and 200, and segments SL9 and SR9 (first segments) are segment rings 110. 210, and the connection adjustment piece 50, 50 ′ (upper component) constituting the upper portion of the tunnel widening portion 300 is connected to the right end portion of the segment SL15 (second segment) or the segment SR14 (third segment). To be attached to the left end of Thereby, the segment SL15 (second segment) and the segment SR14 (third segment) have the same configuration as the segment used in the general part without using the rejoining segment having the special shape as described above. Segments can be used. Therefore, when constructing the portion where the widening is planned in the tunnels 100 and 200, the segment rings 110 and 210 can be efficiently constructed in the same manner as the general part described above by using a general erector device. Therefore, an increase in construction cost can be suppressed.

  Further, according to the present embodiment, when the first connection members 1, 1 ′ are attached to the segment rings 110, 210, the segments SL9, SR9 (first segment) are connected to the first connection members 1, 1 ′. Opposite the gap. As a result, when the segments SL9 and SR9 (first segment) are removed, the segments SL9 and SR9 (first segment) come into contact with the first connecting members 1 and 1 ′, and the connection adjusting pieces 50 and 50 ′ are connected when installed. It is possible to avoid the adjustment pieces 50 and 50 ′ from coming into contact with the first connection members 1 and 1 ′.

  Further, according to the present embodiment, the column members 3 and 3 ′ (support members) are provided at the left end portion or the right end portion of the first connection members 1 and 1 ′. Thereby, since the tunnel width direction center part of 1st connection member 1,1 'can be used as an operator's working space, removal operation | work of segment SL9, SR9 (1st segment) and connection adjustment piece 50,50 are possible. 'Can be installed efficiently.

  In addition, according to the present embodiment, the method for widening the tunnels 100 and 200 includes the segments SL1 and SR1 (fourth segment, first segment) constituting the lower portions of the segment rings 110 and 210 and the segments SL1 and SR1 (fourth segment). Segment SL10, SR2 (fifth segment, second segment), and segment SL1, SR1 (fourth segment), the segment rings 110, 210 are connected to the left end of the segment, the first segment). The segment SL10, SR2 (first segment) is connected to the segment SL2, SR10 (sixth segment, third segment) in which the left end is connected to the right end of the segment (first segment) to form the segment rings 110, 210. The second connecting members 2 and 2 '(5 segments, the second segment) 1) and the left end portions 2a and 2a 'of the first connecting member) and the second connecting members 2 and 2' (first connecting member) on the upper surface of the segments SL2 and SR10 (sixth segment and third segment). The right end portions 2b and 2b ′ are attached, and the column members 4 and 4 ′ (pressing members) for pressing the second connecting members 2 and 2 ′ (first connecting members) from above are provided in the tunnels 100 and 200. , Separating the segments SL1, SR1 (fourth segment, first segment) from the segment rings 110, 210, and connecting adjustment pieces 70, 70 ′ (lower constituent members) constituting the lower part of the tunnel widening portion 300 Attach to the right end of segment SL10 (fifth segment, second segment) or the left end of segment SR10 (sixth segment, third segment) Rukoto, including. As a result, the segment SL10 (fifth segment, second segment) and the segment SR10 (sixth segment, third segment) can be used as described above without using the rejoining segments having the special shapes as described above. A segment having the same configuration as the segment used in the section can be used. Therefore, when constructing the portion where the widening is planned in the tunnels 100 and 200, the segment rings 110 and 210 can be efficiently constructed in the same manner as the general part described above by using a general erector device. Therefore, an increase in construction cost can be suppressed.

  In addition, according to the present embodiment, the method for widening the tunnels 100 and 200 is the same as that for the segment rings 110 and 210 of the pair of left and right tunnels 100 and 200 extending in parallel on the lower surface of the segments SL15 and SR8 (second segment). Attach the left ends 1a and 1a 'of the first connecting members 1 and 1', and attach the right ends 1b and 1b 'of the first connecting members 1 and 1' to the lower surface of the segments SL8 and SR14 (third segment). The pillar members 3 and 3 ′ (support members) are provided in the tunnels 100 and 200, and the segments SL9 and SR9 (first segment) of the tunnels 100 and 200 are separated from the segment rings 110 and 210 of the tunnels 100 and 200. Separation, connection adjustment piece 50 (first upper configuration) constituting the upper left end portion of the tunnel widening portion 300 Is attached to the right end portion of the segment SL15 (second segment) of the left tunnel 100, and the connection adjustment piece 50 ′ (second upper constituent member) constituting the upper right end portion of the tunnel widening portion 300 To the left end of the segment SR14 (third segment) of the right tunnel 200. Thereby, the junction part of tunnel 100,200 can be constructed | assembled comparatively easily.

  In addition, according to the present embodiment, the method for widening the tunnels 100 and 200 includes the segments SL10 and SR2 (fifth segment and second segment) for the segment rings 110 and 210 of the pair of left and right tunnels 100 and 200 extending in parallel. ) Are attached to the upper surface of the second connecting members 2 and 2 ′ (first connecting member) and the second upper surfaces of the segments SL2 and SR10 (sixth segment, third segment). The right end portions 2b and 2b 'of the connection members 2 and 2' (first connection member) are attached, the column members 4 and 4 '(pressing members) are provided in the tunnels 100 and 200, the tunnels 100, 200 segments SL1, SR1 (fourth segment, first segment) from the segment rings 110, 210 of each tunnel 100, 200 The connection adjusting piece 70 (first lower constituent member) constituting the lower left end portion of the tunnel widening portion 300 is separated from the right end portion of the segment SL10 (fifth segment, second segment) of the left tunnel 100. And the connection adjustment piece 70 ′ (second lower component) constituting the lower right end portion of the tunnel widening portion 300 is attached to the segment SR10 (sixth segment, third segment) of the right tunnel 200. Attaching to the left end. Thereby, the junction part of tunnel 100,200 can be constructed | assembled comparatively easily.

  Further, according to the present embodiment, the reinforcing devices 10 and 10 ′ are reinforcing devices for the tunnels 100 and 200 including the segment rings 110 and 210 configured by a plurality of segments connected in the circumferential direction of the tunnel. The segment rings 110 and 210 include segments SL9 and SR9 (first segment) located at the upper part thereof, and segments SL15 and SR8 (first segments) in which the right end is connected to the left ends of the segments SL9 and SR9 (first segment). 2 segments) and segments SL8, SR14 (third segment) in which the left end is connected to the right ends of the segments SL9, SR9 (first segment). Reinforcing devices 10, 10 'have left end portions 1a, 1a' attached to the lower surfaces of segments SL15, SR8 (second segment), and right end portions 1b, 1b, on the lower surfaces of segments SL8, SR14 (third segment). The first connecting members 1 and 1 ′ to which 1b ′ is attached and the column members 3 and 3 ′ (supporting members) that support the first connecting members 1 and 1 ′ from below are provided. Thus, even if the segments SL9 and SR9 (first segment) are removed from the segment rings 110 and 210, the connection between the segments SL15 and SR8 (second segment) and the segments SL8 and SR14 (third segment) is the first connection. It can be continued via the members 1, 1 ′.

  Further, according to the present embodiment, the recesses 1c and 1c ′ are formed on the top surfaces of the first connecting members 1 and 1 ′, and the segments SL9 and SR9 (first segment) are the bottom surfaces 1d of the recesses 1c and 1c ′. , 1d ′ with a gap therebetween. Accordingly, when the segments SL9 and SR9 (first segment) are removed, the segments SL9 and SR9 (first segment) come into contact with the first connection members 1 and 1 ′, and when the connection adjustment pieces 50 and 50 ′ are installed. It is possible to avoid the connection adjustment pieces 50 and 50 ′ from coming into contact with the first connection members 1 and 1 ′.

  Further, according to the present embodiment, the first connecting members 1 and 1 ′ have the box-shaped main body 20 that is rectangular in a plan view, and the main body 20 has an upper surface and a lower surface that are open. Thereby, the worker can easily access the work location from the tunnels 100 and 200 during the removal work of the segments SL9 and SR9 (first segment) and the installation work of the connection adjustment pieces 50 and 50 '.

  In addition, according to the present embodiment, the segment rings 110 and 210 include the segments SL1 and SR1 (fourth segment, first segment) and the segments SL1 and SR1 (fourth segment, first segment) located below the segment rings 110 and 210. Segment SL10, SR2 (fifth segment, second segment), the right end of which is connected to the left end of the segment, and the left end of the segment SL1, SR1 (fourth segment, first segment) Are connected to each other, segments SL2 and SR10 (sixth segment, third segment). Reinforcing devices 10, 10 ′ are provided with left end portions 2a, 2a ′ attached to the upper surfaces of segments SL10, SR2 (fifth segment, second segment), and segments SL2, SR10 (sixth segment, third segment). The second connecting members 2 and 2 ′ (first connecting member) and the second connecting members 2 and 2 ′ (first connecting member) to which the right end portions 2b and 2b ′ are attached to the upper surface of the segment) from above Column members 4 and 4 '(pressing members) to be pressed. Thus, even if the segments SL1, SR1 (fourth segment, first segment) are removed from the segment rings 110, 210, the segments SL10, SR2 (fifth segment, second segment) and the segments SL2, SR10 (first segment) are removed. Connection with 6 segments, 3rd segment) can be continued via 2nd connection member 2,2 '(1st connection member).

  Further, according to the present embodiment, the recesses 2c and 2c ′ are formed on the lower surface of the second connection members 2 and 2 ′ (first connection member), and the segments SL1 and SR1 (fourth segment, first segment) are formed. The segment) is opposed to the bottom surfaces 2d and 2d 'of the recesses 2c and 2c' with a gap therebetween. Thus, when the segments SL1, SR1 (fourth segment, first segment) are removed, the segments SL1, SR1 (fourth segment, first segment) become the second connecting members 2, 2 ′ (first connecting member). , And when the connection adjustment pieces 70 and 70 ′ are installed, the connection adjustment pieces 70 and 70 ′ can be prevented from contacting the second connection members 2 and 2 ′ (first connection member). .

  Further, according to the present embodiment, the second connection members 2 and 2 ′ (first connection member) have the box-shaped main body 20 that is rectangular in plan view, and the main body 20 includes the upper surface and The lower surface is open. As a result, when removing the segments SL1 and SR1 (fourth segment, first segment) and installing the connection adjustment pieces 70 and 70 ′, the worker can easily access the work location from the tunnels 100 and 200. can do.

  In addition, in this embodiment, although the cross-sectional shape of the tunnels 100 and 200 is circular, a cross-sectional shape is not restricted to this, For example, an elliptical shape or a rectangular shape may be sufficient.

  The illustrated embodiments are merely examples of the present invention, and the present invention is not limited to those directly described by the described embodiments, and various improvements and modifications made by those skilled in the art within the scope of the claims. Needless to say, it encompasses changes.

1, 1 '1st connection member 1a, 1a' Left end part 1b, 1b 'Right end part 1c, 1c' Recessed part 1d, 1d 'Bottom face 2, 2' Second connection member 2a, 2a 'Left end part 2b, 2b 'Right end 2c, 2c' Recess 2d, 2d 'Bottom 3, 3', 4, 4 'Column member 5, 5' Jack 10, 10 'Reinforcement device 20 Main body 20a Left end 20b Right end 21 Main girder 21a Recess 22 Plate member 23 Rib member 25 Plate member 26 Bolt insertion hole 27 Plate member 28 Bolt insertion hole 30 Space 31 Support 32 Lower center space 33 Lower space 34 Support 41 Left end face 42 Right end face 50, 50 'Connection Adjustment pieces 51, 51 ', 52, 52', 53 Roof segment 55 Upper arch roof segment 58 Space 61 Upper tunnel support 62 Lower tunnel support 63 Area 70, 70 'Connection adjustment piece 71 71 ', 72, 72', 73 Roof segment 75 Lower arch roof segment 78, 80 Space 81 Underground structure 91 Main girder 92a, 92b Joint plate 93 Skin plate 100, 200 Tunnel 110, 210 Segment ring 120, 220 Floor slab 121 , 221 Through-hole 300 Tunnel widened portion P1, P3, P5, P7 Left edge P2, P4, P6, P8 Right edge SL1-SL15, SR1-SR14 Segment

Claims (11)

A method for widening a tunnel including a segment ring composed of a plurality of segments connected in the circumferential direction of the tunnel,
A first segment constituting an upper portion of the segment ring; a second segment having a right end connected to a left end of the first segment to form the segment ring; and a left side at a right end of the first segment The left end of the first connecting member is attached to the lower surface of the second segment, and the first connecting member is attached to the lower surface of the third segment with respect to the third segment that is connected to the end and constitutes the segment ring. Attaching the right end,
Providing a support member in the tunnel for supporting the first connection member from below;
Separating the first segment from the segment ring; and
Attaching an upper component constituting the upper portion of the tunnel widening portion to the right end of the second segment or the left end of the third segment;
Widening method of tunnel including.   2. The tunnel widening method according to claim 1, wherein when the first connection member is attached to the segment ring, the first segment faces the first connection member with a gap.   The tunnel widening method according to claim 1, wherein the support member is provided at a left end portion or a right end portion of the first connection member. A fourth segment constituting a lower portion of the segment ring, a fifth segment constituting the segment ring by connecting a right end to a left end of the fourth segment, and a left side at a right end of the fourth segment With respect to the sixth segment, the end of which is connected to form the segment ring, the left end of the second connecting member is attached to the upper surface of the fifth segment, and the second connecting member is attached to the upper surface of the sixth segment. Attaching the right end,
Providing a pressing member in the tunnel for pressing the second connecting member from above;
Separating the fourth segment from the segment ring; and
A lower component constituting the lower portion of the tunnel widening portion is attached to the right end of the fifth segment or the left end of the sixth segment;
The tunnel widening method according to any one of claims 1 to 3, further comprising: For each of the segment rings of the pair of left and right tunnels extending in parallel, the left end of the first connection member is attached to the lower surface of the second segment, and the right end of the first connection member is attached to the lower surface of the third segment. Attaching the part,
Providing the support member in each tunnel;
Separating the first segment of each tunnel from the segment ring of each tunnel;
Attaching a first upper component constituting the upper left end of the tunnel widening portion to the right end of the second segment of the left tunnel; and
Attaching a second upper component constituting the upper right end of the tunnel widening portion to the left end of the third segment of the right tunnel;
The tunnel widening method according to any one of claims 1 to 4, further comprising: A method for widening a tunnel including a segment ring composed of a plurality of segments connected in the circumferential direction of the tunnel,
A first segment constituting a lower portion of the segment ring; a second segment having a right end connected to a left end of the first segment to constitute the segment ring; and a right side of the first segment The left end of the first connecting member is attached to the upper surface of the second segment with respect to the third segment having the left end connected to the end and constituting the segment ring. Attaching the right end of the first connecting member to the upper surface;
Providing a pressing member in the tunnel for pressing the first connecting member from above;
Separating the first segment from the segment ring; and
Attaching a lower component constituting the lower part of the tunnel widening portion to the right end of the second segment or the left end of the third segment;
Widening method of tunnel including. A tunnel reinforcement device including a segment ring constituted by a plurality of segments connected in the circumferential direction of the tunnel,
The segment ring includes a first segment located at an upper portion thereof, a second segment having a right end connected to a left end of the first segment, and a left end connected to a right end of the first segment. A third segment, and
The reinforcing device is
A first connecting member having a left end attached to the lower surface of the second segment and a right end attached to the lower surface of the third segment;
A support member for supporting the first connection member from below;
A tunnel reinforcement device.   The tunnel reinforcement device according to claim 7, wherein the first segment faces the first connection member with a gap. A recess is formed on the upper surface of the first connection member,
The tunnel reinforcement device according to claim 7 or 8, wherein the first segment is opposed to the bottom surface of the concave portion with a gap. The first connecting member has a box-shaped main body that is rectangular in plan view,
The tunnel reinforcement device according to any one of claims 7 to 9, wherein an upper surface and a lower surface of the main body portion are open. A tunnel reinforcement device including a segment ring constituted by a plurality of segments connected in the circumferential direction of the tunnel,
The segment ring includes a first segment located at a lower portion thereof, a second segment having a right end connected to a left end of the first segment, and a left side at a right end of the first segment. A third segment having ends connected thereto,
The reinforcing device is
A first connecting member having a left end attached to the upper surface of the second segment and a right end attached to the upper surface of the third segment;
A pressing member that presses the first connecting member from above;
A tunnel reinforcement device.